China Hunan Yibeinuo New Material Co., Ltd. Company News

The ash-conveying pipeline system of thermal power plants is a key part. Since it involves pneumatic transportation, it faces particularly serious wear problems. Due to the high air pressure, fast flow rate and long-term transportation, as well as the hard particles often contained in the materials, the ash conveying pipeline is prone to wear and tear. This kind of wear will not only cause the leakage of pulverized coal and cause environmental pollution but may also cause safety hazards and waste a lot of materials. To deal with this problem, many power plants are actively seeking effective solutions. Currently, there are three main solutions commonly available on the market: 1. Reduce the airflow pressure during ash conveying: This method can indeed reduce pipeline wear to a certain extent because it can reduce the material flow rate. However, this often sacrifices ash-conveying efficiency, and the extension of pipeline life is also limited. Therefore, although this method is simple and easy to implement, the effect is not ideal.   2. Patch or make a square box around the pipe: The advantage of this method is that it is simple to operate and low cost. Pipe life can be extended to some extent by reinforcing areas that are worn or likely to wear. However, it can only solve local problems and has a certain lag. When pipes show new wear and tear, they need to be patched again, which increases maintenance costs and workload. 3. Use wear-resistant ceramic pipes: The best way to fundamentally solve the wear problem of ash-conveying pipes is to optimize the pipe material and improve the wear resistance of the pipe itself. Wear-resistant ceramic pipes are an effective solution proven by many thermal power plants. The main component of wear-resistant ceramics is corundum, which has extremely high hardness, far exceeding that of metal. Therefore, wear-resistant ceramic pipes have excellent wear resistance and have a service life far longer than traditional metal pipes.   As a high-quality wear-resistant ceramic pipe manufacturer with 20 years of production experience, the ash-conveying pipes produced by our company are not only affordable but also have strong wear resistance. By using a steel pipe as the outer shell and a wear-resistant ceramic lining as the structural design, the ash conveying pipeline not only ensures strength but also has excellent wear resistance. Its service life is 7-10 times that of metal pipes, providing a strong guarantee for the long-term stable operation of thermal power plants.

Wear-resistant ceramic fly ash transportation pipelines are substantially different from traditional steel pipes, wear-resistant alloy cast steel pipes, cast stone pipes, steel-plastic, steel rubber pipes, etc. It is not only wear-resistant, corrosion-resistant, and high-temperature resistant, and has high hardness and strength, but also has good comprehensive properties of resistance to mechanical impact and thermal shock.   The outer layer of the fly ash wear-resistant pipe is a seamless steel pipe, and the inner layer is corundum special ceramics. The hardness of the corundum ceramic layer is as high as HV1100-1400, which is equivalent to tungsten-cobalt carbide, and its wear resistance is more than 20 times higher than that of carbon steel pipes. The design of the pipeline combines the strength of seamless steel pipes with the wear resistance of corundum special ceramics, ensuring long-term stable operation when handling abrasive materials such as fly ash. In particular, the high hardness of the corundum ceramic layer gives it excellent wear resistance, far exceeding that of traditional carbon steel pipes.   The advantage of this kind of pipe is that its wear resistance mainly relies on the inner corundum ceramic layer, rather than solely relying on the composition or structure of the material. This means that this type of pipe is more efficient in resisting wear and has a longer service life than traditional wear-resistant alloy cast steel pipes or cast stone pipes. This qualitative leap undoubtedly provides new solutions for wear-resistant pipes in industrial applications.   In practical applications, this kind of fly ash wear-resistant pipe may be used to handle fly ash in various environments, such as fly ash conveying systems in power plants. Its excellent wear resistance and durability enable it to operate continuously and stably in these environments, greatly improving the operating efficiency and service life of the equipment.   The melting point of corundum ceramics in fly ash wear-resistant pipes is 2045°C. The corundum ceramic layer and steel layer have special structures due to process reasons, and the stress field is also special. At normal temperature, the ceramic layer is subjected to compressive stress, and the steel layer is subjected to tensile stress. As long as the temperature rises above 400°C, due to the different thermal contraction coefficients of the two, the new stress field generated by the thermal contraction will offset the original stress field in the fly ash wear-resistant pipe, causing both the ceramic layer and the steel layer to in a state of stress equilibrium. When the temperature rises to 900°C, put the fly ash wear-resistant pipe into cold water and repeat it many times. The ceramic layer will not crack or collapse, showing the unparalleled thermal shock resistance of ordinary ceramics. This performance is very important in engineering construction. CUHK has a purpose.   Since the outer layer is made of steel, and the inner layer does not crack when heated, during construction, flanges, purge ports, explosion-proof doors, etc. can be welded, and direct welding can also be used to connect pipes, which is better than wear-resistant alloy cast steel pipes. , cast stone pipes and steel-plastic, steel rubber pipes are not easy to weld or cannot be welded during construction. Fly ash wear-resistant pipes also have good mechanical impact resistance. The corundum layer will not break and fall off during transportation, installation, knocking, and self-weight bending deformation between the two supports.   The inner layer of fly ash wear-resistant pipes is dense alpha-type aluminum oxide, with an acid resistance of 96-98%. Aluminum trioxide is a neutral oxide and does not react chemically with acids, alkalis, and salts. Aluminum trioxide is an inorganic substance. There is no problem of performance deterioration (i.e. aging) under the long-term effects of light, heat, oxygen, and other natural environments. It has been determined that the corrosion resistance of fly ash wear-resistant pipes is ten times higher than that of stainless steel.

Do you know the processing technology and characteristics of zirconia ceramic tubes? With the continuous development and progress of industrial technology, zirconia ceramic tubes are widely used in various fields. The reason why zirconia ceramic tubes can be widely used is necessarily related to the performance characteristics of zirconia ceramics itself.   Zirconia ceramic is a material with high resistance to crack propagation. He has a high coefficient of thermal expansion, so it is often used to make metallized ceramics. Zirconia is a very good ceramic material, it has two outstanding properties of low thermal conductivity and high strength. Zirconia ceramics are widely used, can be used as wire forming molds, can be used as auxiliary materials in welding processes, and are often the best choice for insulating rings in high temperature environments.    The molding methods of ceramics include dry pressing, isostatic pressing, and injection molding. The zirconia ceramic tube is generally formed by isostatic pressing, which has good strength and is convenient for handling and direct machining. In addition, the isotropic density of the green body is uniform, the stress in the green body is small, the defects such as cracking and delamination of the green body are reduced, and the deformation of the sintered product is small.   Zirconia wear-resistant ceramic pipe has excellent wear resistance, high temperature resistance, mechanical and thermal shock resistance, corrosion resistance, smooth inner wall and easy installation, so zirconia ceramic pipe is especially suitable for material conveying equipment with severe wear and erosion, Equipment protection casing, etc.  

In June 2022, we drove to a cement plant in Jiangsu and found that the grinding chute and belt conveyor unloading chute were seriously worn, and some parts had been welded with multiple iron plates for repair, resulting in the thinning of the main steel plate of the chute, affecting the production and production of the enterprise. Personnel safety.   Our company proposes the following solutions through on-site inspection and on-site communication with customers: 1. Some chutes use a high ambient temperature. Our company adopts a high-temperature resistant dovetail ceramic construction process. By welding the dovetail strips on the inner steel wall of the chute, and then installing dovetail ceramics on the dovetail strips, the dovetail strips are protected. Inside the ceramic, a protective layer is formed to prevent the material from impacting and corroding the dovetail, causing the ceramic to fall off.   2. Most of the chutes are made of impact-resistant spherical alumina ceramics. The surface shape of the material contact is designed to be spherical, which can effectively decompose the impact of incoming materials, and then cooperate with the advanced stud welding process for installation and fixation, which can largely guarantee The wear-resistant ceramics on the wear-resistant lining plate will not break or fall off under the impact of large pieces of material.

Ceramic wear-resistant pipes mainly play a role in connecting equipment and equipment, transporting materials from one equipment to another, and equipment for transporting gas, liquid, or fluid with solid particles.   The difference between the ceramic wear-resistant pipe and the ordinary pipe is that the ceramic wear-resistant pipe will have a corundum ceramic lining inside the ordinary pipe by pasting, welding, or isostatic pressing technology, as the anti-wear layer of the ceramic wear-resistant pipe to protect the outside. The steel pipe is not directly worn and corroded by the material, which greatly prolongs the service life of the pipe.    The ceramic lining of ceramic wear-resistant pipes can choose alumina wear-resistant ceramics or silicon carbide wear-resistant ceramics. Compared with alumina wear-resistant ceramics, silicon carbide wear-resistant ceramics have better wear resistance and higher hardness. Longer life and silicon carbide wear-resistant ceramics are high-temperature resistant ceramics, which can operate effectively for a long time in high-temperature environments, and are suitable for use in high-temperature working conditions.   At present, alumina ceramics are widely used as lining materials for ceramic wear-resistant pipes. From the perspective of actual use, the service lives of wear-resistant ceramics of the same specification are sorted by length. Ceramic pipe, stick-type wear-resistant ceramic pipe, although the service life of stick-type wear-resistant ceramic pipe ranks third, it is still about ten times that of ordinary steel pipe, and the process is simple and the cost is low, so the stick-type ceramic wear-resistant pipe is still present, it is widely used in wear-resistant pipes with high-cost performance.

The wear-resistant ceramic sheet can be directly linked with high wear-resistant alumina ceramics in metal pipes, with its high-cost performance, high hardness, good wear resistance, high-temperature oxidation resistance, good corrosion resistance, powder erosion resistance, particle impact resistance, and Known for its high-temperature resistance, it has been widely used in thermal power, steel, heat, cement, tempering, mining, chemical industry, machinery, etc.   Wear-resistant ceramic sheets have a good application in ash removal pipelines. The shell of the ash removal pipe is generally made of Q235 material and lined with alumina ceramics. Its main function is to offset the scouring and wear of the mixed air flow, which can reduce its damage and prevent the mixed air flow from leaking due to wear and tear, thereby causing certain pollution to the environment, and now the use of wear-resistant ceramic sheets can be effective. to solve this problem.   It can avoid the leakage of the mixed gas due to damage, and then cause certain environmental pollution to the environment. Now the use of wear-resistant ceramic linings can effectively solve this problem and prolong the service life of the pipeline. The reason why the wear-resistant ceramic sheet has such an effect is that the wear-resistant ceramic sheet has the ability of high-temperature resistance, wear resistance, corrosion resistance, shock resistance, thermal expansion, and contraction resistance.   The wear-resistant ceramic sheet is pasted with professional ceramic sheet glue, so that it can be firmly bonded to the inner wall of the equipment without falling off. It has good heat resistance and can operate for a long time at 350 ℃ without aging.  

Dry pressing of wear-resistant ceramics: Dry pressing is putting the powder (5% to 8% moisture) into a metal mold and compressing it under the action of force (usually one-way pressure), and in the voids of the blank Part of the gas is discharged, the particles are displaced, gradually close together, and close to each other, and finally form a blank with the same cross-section as the mold and the shape of the upper and lower sides is determined by the upper and lower pressure heads of the mold. The size of the cavities in the formed body is significantly reduced, the number is greatly reduced, the density is significantly increased, and a certain degree of strength is obtained. The advantages of dry press molding are high production efficiency, less labor, low scrap rate, short production cycle, high density, and high strength, suitable for mass industrial production; the disadvantage is that the shape of the molded product is relatively limited, and the mold cost is high. , The strength of the body is low, the compactness of the body is inconsistent, and the uniformity of the structure is relatively poor. In the field of ceramic production, the products manufactured by the dry pressing method mainly include large pieces of thick porcelain, wear-resistant porcelain lining tiles, sealing rings, etc. Grouting forming method of wear-resistant ceramics: Grouting forming is the earliest forming method of alumina wear-resistant ceramics. Due to the use of plaster molds, the cost is low and it is easy to form large and complex-shaped parts. The key to grouting is to prepare alumina slurry. Usually, water is used as the flux medium, and then the degumming agent and adhesive are added. After sufficient grinding, the gas is discharged and then poured into the plaster mold. Since the capillaries of the plaster mold absorb moisture, the slurry solidifies in the mold. In the hollow grouting process, when the adsorbed slurry on the mold wall reaches the required thickness, the excess slurry needs to be poured out. To reduce the shrinkage of the green body, a high-concentration slurry should be used as much as possible.    

The equipment lining ceramics uses zirconia and alumina, the advantages of these two materials. Comparison of ceramic toughness: The toughness of zirconia ceramics is 4 times that of alumina ceramics. At the same time, the free fall of zirconia from a height of one meter will only cause some gaps in the alumina to break. Density comparison: The density of zirconia ceramics is twice that of alumina ceramics. In contrast, zirconia has better compressive performance. Comparison of friction coefficient: The friction coefficient of zirconia ceramics is only 1/2 of that of alumina ceramics. Density comparison: The density of zirconia ceramic structural parts is higher than that of alumina ceramics. The density of alumina ceramics is 3.5, the density of zirconia ceramics is 6, and the texture is more delicate. After grinding, the surface finish is higher and can reach 9 or more. Surface finish comparison: The zirconia ceramic structure has a higher surface finish, mirror-like, extremely smooth, and has less friction. In addition, the zirconia ceramic structure has excellent toughness, overcomes the inherent brittleness of the ceramic itself, and has higher wear resistance, The service life of the product is greatly extended. Generally speaking, zirconia is more wear-resistant and corrosion-resistant than alumina, and of course, the price is slightly higher.        

In modern construction, concrete pump trucks are widely used. The pump truck manufacturers on the market generally use high manganese steel cast pump pipe elbows. This material generally has a short service life, due to the high-speed and high-pressure flow of concrete in the pump truck pipeline Huge friction is generated, and the outer arc of the inner wall of the pump tube is severely worn, making the elbow unusable. Based on the above working conditions, our company has developed a ceramic lining for concrete pipes. Its characteristic is that alumina ceramics are pasted on the inner wall. The hardness of alumina ceramics can reach HRA88, second only to diamond. This technology appears The phenomenon that the pipeline is easy to wear is completely solved, and the service life is prolonged. The service life of the alumina ceramic pipe is 5-6 times that of the high manganese steel pipe, which saves costs for the enterprise.   According to the principle of concrete wear, a 207-degree arc-shaped structural ceramic is specially designed to line the outer arc, and the inner arc adopts two combinations of ceramic sheets. For the flange mouth, we design the upper and lower interlocking ceramics to ensure that the flange mouth is in the material During the scouring process, it will not be worn the ceramic will not fall off, and can withstand 50KG pressure.   The ceramic installation is smooth to ensure that when the material passes through the pipeline, it has low resistance, low noise, no blockage, no material accumulation, and the pipeline is easy to clean. Our company is a manufacturer and a global concrete pipe supplier, providing you with high-quality products and competitive concrete pipe prices. We look forward to cooperating with you!  

Tuesday, September 21, 2021, August 15 of the lunar calendar, is my country's traditional festival-Mid-Autumn Festival. It is the second largest traditional festival after the Spring Festival. It is also regarded as the reunion festival for us Chinese. Every day, many wanderers who are far from home rush back home to gather with their parents and relatives and friends to enjoy their drinks. Mid-Autumn Festival moon is the roundest, brightest, and most beautiful; Mid-Autumn Festival moon is like water like a mirror, poetic and picturesque, full of deep family affection. Now, I want to ask everyone: Do you know the origin of the Mid-Autumn Festival? The fifteenth day of the eighth lunar month is the traditional Mid-Autumn Festival in my country. This is the mid-autumn period of the year, so it is called the Mid-Autumn Festival. This is also the second largest traditional festival in my country after the Spring Festival. The term "Mid-Autumn Festival" first appeared in the Zhou Dynasty, and the popularity of the Mid-Autumn Festival began in the Song Dynasty. Why is it called "Mid-Autumn Festival"? Because the 15th day of the eighth lunar month falls in the middle of the third autumn, it is called "Mid-Autumn Festival". There are many names for the Mid-Autumn Festival: "August Festival", "August and a half", "Moon Festival", "Moon Eve" and so on.   The Mid-Autumn Festival was originally a harvest festival. In the past, in the harvest season, people always had to celebrate something big, celebrate a good harvest of the year, and enjoy the joy of a good harvest. During the Mid-Autumn Festival, there are few clouds and fog, and the moon is bright. In addition to a series of activities such as admiring the moon, worshiping the moon, eating moon cakes, and blessing reunion, some places also have activities such as dancing grass dragons and building pagodas. There are many beautiful legends about the Mid-Autumn Festival, such as Chang'e flying to the moon, Wu Gang turning osmanthus, jade rabbit pounding medicine and so on. These all entrust people's infinite love for life and yearning for a better future. People recite a lot of poems and songs on the Mid-Autumn Festival, the most famous of course is Su Shi's "I hope people will live forever, and we will live together for thousands of miles."   Colleagues, how do you feel in this beautiful day? I believe that many people's answer is: homesick, miss their parents.   Yes, every holiday season, I miss my family. Of course, the Mid-Autumn Festival will be deeper, especially when the moon is high. Throughout the ages, many literati and scholars have missed their relatives, their hometown, and the motherland in these beautiful days, hoping to reunite with their relatives and share joy.   I sincerely say in advance to all the staff who are selfless, to all the hard-working colleagues, and to your family and friends: Happy Mid-Autumn Festival