The advantages and disadvantages of ceramic chip lined wear-resistant pipes

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Features of ceramic chip lined wear-resistant pipes:

Paste the ceramic sheet on the steel pipe with high temperature wear-resistant glue to play the role of wear-resistant. The pipe is generally white. Generally used for large diameter pipes

 

  • Advantages: ceramic patch wear-resistant pipes have good wear resistance (compared to spontaneous combustion) and long service life
  • Disadvantages:

1) Due to the temperature of the adhesive, it is not resistant to high temperature and easy to fall off

2) If the medium is corrosive, it is easy to corrode the steel pipe between the gaps of the patch.

Decho is a professional supplier on ceramic chip lined wear-resistant pipes. If you need any for your project , pls feel free to contact us by email [email protected]

Why choose ultra-high molecular polyethylene material as the material of the tunnel escape pipe? What are the installation standards?

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Tunnel escape pipe

 

The escape pipeline used in the tunnel is made of ultra-high molecular weight polyethylene. The installation of escape pipelines in the tunnel is generally based on prevention and facilitates escape. The tunnel escape pipeline plays a role of secondary defense. The polymer escape pipeline is light in weight, easy to disassemble and transport; the pipeline has good toughness and high impact resistance. It deforms instantly when impacted by a strong external force, absorbs a large amount of impact energy, and then quickly restores its original shape, providing emergency rescue for highway tunnel construction escape Safe and reliable guarantee.

The tunnel escape pipe is a pipe made of ultra-high molecular weight polyethylene. It is simple, pure and not exaggerated because of its appearance, and its nature is solid, durable and not perishable. The quality of the pipe is much higher than that of commonly used pipes. It has extremely high impact resistance and cannot be broken by external impact. It will not be deformed after being hit by a large stone and can be restored to its original appearance.

Installation of escape pipe

 

The main purpose of the installation of ultra-high polymer escape pipes is to prevent and avoid risks. The ultra-high polymer escape pipes are called “amazing engineering plastics”, which have very strong impact resistance and wear resistance, even if they are strongly affected by the earth’s crust. Changes, such as earthquakes, will not break the pipeline, but will only slightly deform. It is almost impossible to measure the impact resistance limit of UHMWPE pipes. Therefore, the use of escape pipes as escape pipes is very cost-effective.

 

Decho is a professional supplier on tunnel escape pipes. if you need any for your project , pls feel free to contact us by email [email protected]

What is the principle of the escape pipe setting?

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What is the principle of the escape pipe setting?

1.Adequate ventilation, tunnel escape ducts and alarm facilities should be set up at the construction site as required.
2.Tunnel construction needs to implement a time-limiting system for operations, and the dangerous projects must be stopped at night.
3.In terms of tunnel escape pipeline support, the construction unit must strictly manage the tunnel construction support construction process, and it is strictly forbidden to support lagging and safe step distance exceeding the standard.
4.The construction unit should select a qualified company to carry out advanced hydrogeological forecasting and measurement of tunnels. The advanced geological forecasting and measurement company shall improve the quality of forecasting and monitoring, and provide timely and accurate feedback to entry.
5.In terms of tunnels, there must be a special safety construction plan, and a tunnel safety team should be established with sufficient safety personnel.
6.The construction company shall formulate emergency response plans in accordance with regulations, establish emergency rescue teams, allocate emergency rescue personnel, etc., and hold emergency escape drills on a regular basis, such as construction, supervision, and design.
7.Under conditions, mechanized operations should be implemented for escape pipes from tunnels over 1km to reduce the number of operators. Regarding the management of tunnels below 1km, the entry and exit of personnel and vehicles must also be managed in a standardized manner, and unrelated personnel are strictly prohibited from entering.

Standard escape pipeline options:

1.Ensure that the thickness of the tunnel escape pipe is not less than 30mm
2.The length of each tunnel escape pipe is 3 meters
3.The tunnel escape pipe can be manually disassembled, and the connection is firm and safe.
4.When the tunnel escape pipe is temporarily dismantled and moved, it shall be dismantled section by section, and it is strictly prohibited to dismantle it in place at one time.
5. The tunnel escape pipeline should be flat, dry and smooth, and must not be used for purposes other than emergency escape.

 

Decho is a professional supplier on escape pipes . If you need any for your project , pls do not hesitate to contact us by email [email protected]

What do you know about bimetallic pipes?

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Introduction of Bimetal Wear-resistant Pipes

The bimetallic composite pipe is a new type of wear-resistant pipe developed by our company. The outer layer of the straight pipe is made of ordinary steel pipe, and the high chromium cast iron is formed through the casting process. The inner lining is compounded. The outer wall of the elbow adopts a hot simmering elbow, and the inner layer is cast with high chromium cast iron. Compared with the traditionally used wear-resistant alloy cast iron, wear-resistant alloy cast steel, steel-ceramic composite pipe and cast stone pipe, the pipeline has many advantages.

Production Process

 

In the production process of the bimetal wear-resistant pipeline, the straight pipe adopts casting technology. This technology is that the liquid wear-resistant metal material is fused to the surface of another metal to form a composite steel body after hot melting, achieving the purpose of true metallurgical bonding. The bonding layer The shear strength is higher than that of the body metal, which fully realizes the mechanical complementarity of the base layer and the wear-resistant layer; the elbow, tee, reducer and other pipe fittings adopt the lost foam vacuum suction casting compound process, which is advanced in technology and effectively solves the problem The problem of compounding, the elbow and various other special-shaped pipes can be integrated as a whole, without changing the flow trajectory of the material in the elbow, and greatly reducing the resistance of material transportation.

In the selection of material, the outer wall of the steel is made of carbon steel, which ensures that the wear-resistant tube has high mechanical strength and impact resistance; the wear-resistant layer of the lining is made of wear-resistant alloy steel series, which is mainly added with Cr-Ni-Mo -Cu-RE and other alloys, after quenching and tempering heat treatment process, make the alloy steel not only have strong wear resistance and corrosion resistance, but also have higher mechanical strength and impact resistance.

Features of bimetal wear-resistant pipe products

1. Good wear resistance, giving full play to the excellent wear resistance characteristics of high chromium casting (KMTBCr20Mo3CuRe). The wear layer is made of high complex alloy material. The macroscopic hardness can reach HRC55 or more. The structure contains a large amount of M7C3 type hard. Carbide, its micro-hardness is HV1500-1800, and its anti-abrasive and wear-resistance performance is more remarkable. .

2. High pressure bearing, suitable for any pressure level. The inner lining is tightly combined with the outer steel pipe. The special process is adopted to form a weld between the composite layers to ensure operational reliability.

3. Good resistance to mechanical shock, thermal shock, wear and corrosion, and high temperature resistance: Since the matrix is ​​mainly composed of austenite and carbide, there is a large amount of Gr element in the solid solution, so it can be significant in corrosion or high temperature environments The bimetal wear-resistant elbow has good wear resistance, corrosion resistance and high temperature resistance.

4. Convenient installation and connection, flanges can be used, arbitrary cutting, welding, and good overall performance: The bimetal composite wear-resistant pipe adopts ordinary steel pipe outside and high-end wear-resistant alloy inside, which forms a better metallurgical combination at the same time , It also gives full play to the wear resistance and corrosion resistance of high complex alloys and the good mechanical strength and impact resistance of ordinary steel pipes. It solves the contradiction between weldability and wear resistance that are difficult to reconcile with a single material. Able to achieve the best fit.

Application scope of bimetal wear-resistant elbows and pipes:

1. Power industry: raw coal system silos, hoppers, hoppers, powder feeding pipelines,
2. Coal industry: heavy ore coal preparation pipelines in coal preparation plants, wet coal conveying systems, sediment backfilling in mining
3. Mining industry: mine filling, concentrate transportation, tailings transportation pipeline
4. Iron and steel industry: coke particle transportation pipeline, coal mill pipeline, separator, elbow, cone, separation baffle
5. Cement industry: coal powder transportation. Mineral powder transportation
6. Machinery industry: lining of equipment for pulverizing, dust removal and ash discharge systems of power plants, and lining of dust removal equipment in steel plants.

Decho is a professional supplier on bimetallic pipes. If you need any for your project , pls contact us by email [email protected]

Manufacturing process of dredging sand pumping pipe

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The daily application of dredging sand pumping pipes is mainly to discharge silt from rivers, lakes and other places. The accumulation of silt and salt in some river ports will affect the normal navigation of our ships. At this time, we need to The sludge is discharged by the dredging sand pumping pipe, which has high efficiency and low cost, which is inseparable from its good production technology.

1. The dredging and sand pumping pipe is made of ultra-high molecular weight polyethylene powder plus a small amount of paraffin wax and carbon black through high temperature melt extruding extruder.
2. Ultra-high pipes with different diameters and thicknesses need to choose different molds.
3. The length can be made arbitrarily according to the actual needs of users.
4. Color Masterbatch can be added to the raw materials according to user needs. Generally, carbon black is added to produce black UHMWPE pipes, which can be used for anti-sun and ultraviolet radiation.

How to reduce the clogging of the dredging sand pumping pipe?
During the construction of the dredging and sand pumping pipes, the problem of blockage of the wear-resistant pipes will be encountered, which will affect the progress of the project. There are many factors that affect the blockage of wear-resistant pipes. Including the size, shape, concentration, specific gravity, tube wall roughness, fluid viscosity, etc. of the solid particles in the mud mortar. The main factors are as follows:
(1) The larger the particle size of the mud and mortar, the larger the particle size of the conveying medium, which will increase the sedimentation speed of the particles in the mud and cause pipeline blockage, thereby increasing the resistance loss of the dredging pipe. Therefore, reducing the particle size in the slurry can effectively improve pipeline blockage and reduce the pipeline transportation resistance of the slurry.
(2) The surface roughness of the dredging pipe, the roughness of the inner wall of the pipe will increase the resistance coefficient of the pipe. Therefore, ultra-high molecular weight polyethylene pipes with smooth surfaces should be selected to effectively reduce pipeline resistance.

The above are the reasons for the blockage of the dredging and sand pumping pipes. After knowing these reasons, we need to prescribe the right medicine. Different types of wear-resistant pipes have different prices, so it is very important to choose cost-effective wear-resistant pipes. From the transportation and installation of the pipeline to the normal use in the future, choose the cost-effective wear-resistant pipe according to the wear rate of the transmission medium during use.

Different types of dredging and sand pumping pipes have their own product characteristics and are used in different fields. When choosing, wear-resistant pipes should be customized according to their own working conditions and technical requirements. Some require only abrasion resistance, some require abrasion resistance and good corrosion resistance, and some require high temperature or low temperature resistance. Only by choosing suitable wear-resistant pipes can the dredging and sand pumping pipes last longer and the medium transport effect can be better.

Decho is a professional supplier of dredging sand pumping pipe. If you need any for your project , pls feel free to contact us by email . [email protected]

Knowledge about wear-resistant pipes

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Wear-resistant pipes mainly include wear-resistant elbows, straight pipes, tees, small and small ends, square and round joints, reducing pipes and other structural parts, which are mainly used for pneumatic, pumping slurry and other material transportation pipelines. Because the conveying medium has the characteristics of high hardness, fast flow rate, and large flow rate, it can effectively reduce the long-term continuous impact, wear and corrosion of the conveying medium on the pipe wall, which causes the pipeline to fatigue and gradually wear through.

1. Definition of wear-resistant pipe

According to different wear conditions, there are also different material choices for wear-resistant pipeline lining. Wear-resistant ceramic pipes lined (lined with aluminum oxide, silicon carbide, zirconia, silicon nitride, Sialon, aluminum nitride, boron nitride, etc.); wear-resistant alloy pipes; tortoise shell mesh wear-resistant pipe fittings; steel rubber resistant Grinding pipe; steel-plastic wear-resistant pipe; wear-resistant cast stone pipe; wear-resistant self-propagating composite pipe; rare earth alloy wear-resistant pipe, etc.

2. The main application of wear-resistant pipes

Wear-resistant elbows are widely used in the following industries in addition to ash removal, slag discharge pipes, powder feeding and powder returning pipes, and desulfurization pipes in coal-fired power plants:

Mines: coal water slurry, coal washing slime, mine filler, pulverized coal in the coal industry;
Metal mines: wear-resistant elbows for conveying concentrates and tailings;
Metallurgy: blast furnace coal injection and slag conveying pipelines in iron and steel plants; CAO, zinc dust conveying pipelines, steel conveying ferroalloys, furnace refining and other preferred wear-resistant elbows;
Cement plant: raw slurry conveying, coal powder conveying, elevator unloading, finished cement pneumatic conveying and unloading, concrete conveying wear-resistant elbow of rotary kiln wet production line.
Chemical plant: pulverized coal transportation pipeline, silicon powder and other raw materials transportation wear-resistant elbow.

3. Detailed use of wear-resistant pipes

It has spread to the industries of electric power, metallurgy, coal, petroleum, chemical industry, building materials, machinery, etc., and is developing rapidly. When the abrasive material is transported in the wear-resistant pipe (such as ash, coal powder, slag powder, tailings, cement, etc.), there is a problem of rapid wear of the wear-resistant pipe, especially the elbow wears faster . When the gas, liquid or solid with strong corrosion is transported in the wear-resistant pipeline, there is a problem that the wear-resistant pipeline is corroded and quickly damaged. When materials with higher temperature are transported in wear-resistant pipes, there is a problem that the use of heat-resistant steel pipes is very expensive. After the wear-resistant pipes are on the market, these problems are solved. Wear-resistant pipelines are widely used for the transportation of severely worn mine fillers, ore concentrates and tailings. Wear-resistant pipelines such as powder delivery, slag removal and ash transportation in coal-fired thermal power plants are also very suitable. Wear-resistant pipelines are ideal wear-resistant pipelines for transporting strongly corrosive acids, alkalis, salts, and abrasive solids and liquids. Wear-resistant pipelines are very safe and reliable when used in high-temperature corrosion, high-temperature wear or high-temperature ablation.

Decho is a professional supplier of ceramic wear resistant pipes, if you need any material for your project , pls feel free to contact us by email [email protected]

Three minutes to understand the process of wear-resistant ceramic construction and the precautions of the construction process

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General wear-resistant products are mainly used in severely worn industries such as thermal power, steel, smelting, machinery, coal, mining, chemicals, ports and docks; they can be installed in thermal power plants from small units of 50,000 kilowatts to large units of 1 million kilowatts. It can be installed and used in its coal conveying, pulverizing, ash discharge, and dust removal systems; it can also be installed and used in the conveying, batching, and dust removal systems of the sintering branch of steel plants and smelters. Construction work is divided into: adhesive type, direct adhesive type, impact resistance type, cement type, assembly type, heat-resistant adhesive type, cold-resistant adhesive type, wear-resistant ceramic liner and lining. It can be used for wear-resistant ceramic pipes such as wear-resistant elbows, wear-resistant straight pipes, wear-resistant tee, wear-resistant special-shaped pipe fittings, etc.

During the operation of the equipment, due to the constant friction, corrosion, collision, and impact of the hard medium, the system is extremely prone to leakage, causing environmental pollution. Therefore, various manufacturers pay more attention to the construction of wear-resistant ceramics and have high requirements.

Equipment anti-wear is a systematic project. Different manufacturers adopt different construction methods, and the results will be very different. At present, the construction steps of our wear-resistant ceramics are generally to repair and polish the equipment, and then mix and apply glue. Gluing, pasting, curing, special products also need welding and other work. These seemingly simple tasks are not so easy to implement. This is a careful, experienced, and time-consuming job that cannot be done by a makeshift team. Unfortunately, some users attach great importance to the selection of wear-resistant ceramics and viscose, but ignore the control of the construction of wear-resistant ceramics. In order to save costs, some manufacturers often set up temporary construction teams in the local area. These temporary construction teams are difficult to control in terms of operation technology and sense of responsibility. As a result, the expensive wear-resistant ceramics quickly fall off and fail to achieve the expected prevention. Grinding effect.

How to avoid the wear-resistant ceramic sheet falling off during use:
1. Before the wear-resistant ceramic patch is applied to the surface of the steel parts, the steel parts are not properly treated, some are not thoroughly rusted, and some are not smooth. In order to obtain a good construction effect, the steel parts must be pretreated by sandblasting. Wipe with acetone on the surface of steel parts to achieve a certain degreasing and degreasing effect;
2. The ratio of the wear-resistant ceramic glue is wrong, and the ratio of different glues is different. It must be strictly controlled. If the ratio is not suitable, the predetermined viscosity cannot be achieved;
Third, the wear-resistant ceramic glue is not evenly spread, so it is easy to fall off where there is no glue or too little glue. After the construction of the wear-resistant ceramic sheet is completed, use a rubber hammer to gently tap it, and the construction surface should be flat;
4. The working temperature of the wear-resistant ceramic patch must be clarified before construction. The wear-resistant ceramic patch can withstand a high temperature of one thousand degrees. Different temperatures should be selected with different temperature resistance properties, otherwise it is easy to wear with the temperature The phenomenon of ceramic patch falling off;
I suggest you choose an experienced construction team when constructing wear-resistant ceramics. Good wear-resistant ceramic construction can make the effect much better.

Decho is a professional supplier on ceramic wear-resistant pipes , if you have any request , pls feel free to contact us by email [email protected]

What is the production process of wear-resistant pipes? What are the advantages?

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The wear-resistant pipe is manufactured by the self-propagating high-temperature synthesis-centrifugal method. That is, the seamless steel pipe is placed in the tube mold of the centrifuge, and a mixture of iron oxide powder and aluminum powder is added to the steel tube. This mixture is called the thermite in chemistry. After the centrifuge tube mold rotates to a certain speed, The spark ignites the thermite, the thermite immediately burns by itself, and the combustion wave spreads rapidly, and the following violent chemical reactions occur during the spread:
2Al+Fe2O3=Al2O3+2Fe+836KJ
3Fe3O4+8Al=4Al2O3+9Fe+3265KJ

After the thermite reacts, the product is stable α-Al2O3 (corundum) and iron, which emits a lot of heat at the same time. Such heat as under adiabatic conditions, the adiabatic temperature can reach 3753K and 3509K, it makes the original material in the steel pipe and the product after the reaction, even the corundum with a melting point of 2045 ℃ all become molten. Because the reaction is very rapid, only a few seconds, the molten reactant is quickly separated according to the specific gravity under the action of centrifugal force, the specific gravity of iron (7.85g/cm3) is twice that of Al2O3 (3.95g/cm3), the heavier iron Throwing to the inner wall of the steel pipe by centrifugal force, the lighter Al2O3 is distributed in the inner layer of iron.

Due to the rapid heat absorption and heat transfer of the steel pipe, Al2O3 and Fe quickly reach the freezing point and solidify in layers. The finally formed wear-resistant pipeline is composed of corundum porcelain layer, iron-based transition layer, and outer steel pipe layer. High-temperature molten iron and Al2O3 liquid contact with the inner wall of the steel pipe, making the inner wall of the steel pipe half outside. In the molten state, the iron layer and the steel pipe form a metallurgical bond, and the iron layer and the corundum porcelain layer also form a firm bond. The combined compressive shear strength (that is, the strength when the ceramic is laminated in the axial direction) ≥ 15MPa; the wear-resistant pipeline is crushed Strength (that is, the strength when the ceramic inside the tube is crushed from the outside of the tube) ≥ 350MPa;

The advantages of wear-resistant pipes compared with traditional pipes

Wear-resistant pipes are fundamentally different from traditional steel pipes, wear-resistant alloy cast steel pipes, cast stone pipes, steel-plastic and steel rubber pipes. The outer layer of the wear-resistant pipe is seamless steel pipe and the inner layer is corundum. The hardness of the corundum layer is as high as HV1100-1400, which is equivalent to tungsten-cobalt cemented carbide, and its wear resistance is more than 20 times higher than that of carbon steel pipes. The wear resistance of wear-resistant pipes is mainly based on the inner layer of corundum that is several millimeters thick. This is a qualitative leap in resistance to wear compared to wear-resistant alloy cast steel pipes and cast stone pipes not only by composition and structure, but also by thickness.
Wear-resistant pipes quickly occupy the market. In addition to high quality and good performance, it also has a higher cost performance than other wear-resistant, corrosion-resistant and heat-resistant pipes. In terms of wear-resistant pipes of the same specification and unit length, the weight of wear-resistant pipes is only about one-half of wear-resistant alloy cast steel pipes, and the project cost per meter is reduced by 20%-30%; only the weight of cast stone pipes is one-third. Reduce project cost by 5%-10% per meter; wear-resistant pipes used in corrosive or high-temperature situations are only a fraction of stainless steel pipes and nickel-titanium pipes.

Decho is a professional supplier of wear-resistant pipes . If you need any for your project , pls feel free to contact us by email [email protected]

What is tortoise shell net wear-resistant elbow?

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Tortoise shell mesh wear-resistant elbow type name: heat insulation wear-resistant lining elbow.
The composition of tortoise shell net wear-resistant products: steel body + tortoise shell net + pouring wear-resistant material

Product production process:
1. Surface treatment: Blow off the floating dust and polish to remove the floating rust.
2. Welded tortoiseshell mesh: requires more than two solder joints in four grids (the solder joints are required to be evenly distributed)
3. Pouring wear-resistant paint: Stir the powdery wear-resistant material and adhesive thoroughly, and then fill it in the welded tortoise shell grid to ensure that each grid is filled with sufficient wear-resistant material, and the lining is resistant The surface of the grinding layer should be smooth and flat, without obvious unevenness.
4. Wait for the wear-resistant material to fully solidify.

Generally, the minimum diameter of the tortoise shell mesh wear-resistant elbow is above DN100mm. The wear-resistant castable is according to the SH3531-2003 standard, the thinnest is 25mm and the last 30mm. The thickness of the tortoise shell mesh wear-resistant products produced by our company is different due to the nature of the conveying conditions and the different media. They can be designed and produced according to customer needs and industrial and mining needs.

4 advantages of tortoise shell mesh wear products:
1. Strong wear resistance and impact resistance
2. Good shock resistance
3. High temperature resistance
4. No increase in circulation resistance.

Decho is a professional supplier on tortoise shell net wear-resistant elbow. If you need any for your project , pls feel free to contact us by email [email protected]

Ceramic patch wear-resistant tube for power plant

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There are two production processes for ceramic patch wear-resistant pipes for power plants: pasting process and inlay process

 

Ceramic chip type and thickness in ceramic chip wear-resistant tube:

Mutual pressure 60*40, 50*40, 30*25

Mosaic 10*10*10, 10*10*5, 17.7*17.5*5, 17.5*17.5*10

Purity: 92, 95, 97, 99

 

There are two types of ceramic adhesives for the inner wall of wear-resistant pipes for power plants: inorganic adhesives and organic adhesives. The difference is that inorganic adhesives can withstand temperatures within 500°C, while organic adhesives can withstand temperatures between 120°C and 380°C.

 

Performance introduction of ceramic patch wear-resistant pipe for power plant:

  1. Wear resistance: The Al2O3 content in the inner ceramic layer of the ceramic composite steel pipe is greater than 90%, the microhardness is HV1000-1600, and the density is 3.8-3.97g/cm3, so it has extremely high wear resistance. The quenched medium carbon steel is ten times higher than the tungsten carbide carbide.
  2. Corrosion resistance: ceramics are neutral materials with stable chemical properties, excellent corrosion resistance and acid resistance, resistance to various inorganic acids, organic acids, organic solvents, etc., and its corrosion resistance is more than ten times that of stainless steel .
  3. Heat resistance: The ceramic layer is dense corundum with a linear expansion coefficient of 6-8×10-6/℃. Excellent heat resistance, can withstand temperatures above 2000℃, and can work for a long time in the range of -50℃～900℃.
  4. Mechanical properties: It has excellent mechanical properties. Its crush strength is 300-600MPa, compressive shear strength is 20-30MPa, and the mechanical impact test has no obvious cracks under 50t energy impact for 15 times.
  5. Easy to weld: The ceramic-lined composite steel pipe can be connected by welding the outer steel pipe.
  6. The connection method of the product: Welding connection and flange connection of the transition section. If there is no transition section, the welding will be affected. If there is no transition section, the welding residual heat will affect the bonding of the ceramic patch while welding, which will melt the adhesive and make the bonded ceramic patch fall off, thereby reducing the adhesion. Therefore, the quality should be set aside for the transition period.

 

What are the contraindications of this product?

Inorganic glue can’t take water, organic glue has a higher temperature resistance than inorganic glue

 

Which industries does this product apply to?

Power plant pulverized coal, ash slag, mine powder, tailings, backfill, coal from coal mines, concentrators, coke particles from coking plants, and materials from sintering plants.

 

Decho is a professional supplier on Ceramic patch wear-resistant tube. If you need any for your project , pls feel free to contact us by email [email protected]