Ceramic Valves for Liquid Chlorine Filling & High and Negative Pressure
May 27, 2024
In chlor-alkali industrial production, leakages of production fluid often occur, which not only reduces safety of production, but also wastes resources and affects the production efficiency of industrial enterprises.
In industrial production, many process operating media contain corrosive liquids and gases such as hydrochloric acid, sodium hypochlorite, and caustic soda. Affected by the particularity of the chemical production industry itself, if you want to ensure production quality, it is necessary to control the standards and specifications of the instruments in the production line. The types of instruments include process control and process detection. In order to ensure the operating status of the instruments, the selected instrument materials and forms must be processed according to high standards and strict requirements to ensure that the efficiency of chlor-alkali production can be improved.
Analysis of properties of ceramics
Generally speaking, the ceramic is mainly composed of natural products or compounds that are formed and fired at high temperatures. Essentially, this material belongs to a kind of inorganic non-metallic substance. When analyzing the characteristics of ceramics, they can be classified from two aspects, that is, structural ceramics and functional ceramics. Among them, the former mainly refers to a type of ceramic materials that can be directly applied to engineering structural materials to assist construction. The characteristics of this type of ceramics include good strength, high-temperature resistance, high elastic modulus, good thermal shock resistance, hardness and wear resistance. When classifying structural ceramics, they can be divided into three series, namely oxide series, non-oxide series and structural ceramic matrix composite series. Compared with the former, the characteristics of the latter include biological, electrical, magnetic, optical, chemical, superconducting, acoustic and many other characteristics. Different characteristics even have the function of transforming each other. With the continuous improvement of industrial production technology, the application of ceramics in the field of process production are getting wider and wider, and they fully rely on their production and processing advantages such as good hardness, high melting point, oxidation resistance, and good wear resistance, attracting the attention of more chemical companies and favored by processing industry procurement. Among all engineering materials, the stiffness of ceramics is the most suitable. The stiffness and hardness have the best advantages, and the hardness has even exceeded 1500hV, making ceramics the best choice for chemical production, especially chlor-alkali chemical production. According to industry reports, at this stage, thermal power generation, waste incineration, mining, papermaking, steel and metallurgy and other industries have begun to use products from ceramic valve manufacturers to support the smooth completion of processing operations in harsh chemical production environments and promote profits of chemical enterprise increased.
In industrial production of chlor-alkali, liquid nitrogen is often used as a material to assist production. From the perspective of production principles, the production of liquid nitrogen mainly relies on the control of properties of gas, that is, liquefying chlorine gas by applying pressure and reducing the ambient temperature. When analyzing liquid nitrogen, it can be found that liquid nitrogen with good purity does not corrode industrial production pipelines and even valves. However, when the amount of water contained in the raw chlorine gas is too high, corrosion will occur. In the on-site production of chlor-alkali industry, when the transportation pipelines and production lines run smoothly for a period of time, problems such as valve jamming will occur, accompanied by problems such as adjustment difficulties to varying degrees, causing the production line to be shut down for maintenance and affecting the operational efficiency of industrial production enterprises. Faced with the above situation, technicians need to dismantle the pipeline. After disassembly, they will usually find that a large amount of black or brown substances will accumulate at the valve position. The accumulated substance contains a large amount of ferrous and trivalent iron. After sorting out the reasons for this, technicians believe that when the moisture contained in the production system is too much, it will begin to corrode the pipeline. As the degree of corrosion deepens, the rust in the pipeline will begin to fall and slowly accumulate. As the liquid nitrogen flows, it flows uniformly to the valve, causing the valve to fail.
Generally speaking, when filling liquid nitrogen, the process procedures that flow through are very complex, requiring technicians to ensure the safety and reliability of the filling site. In particular, they need to do a good job in the management of automatic shut-off valves and regulating valves to ensure closing at the critical moment. The pipeline has high pressure, low temperature and negative pressure during the vacuuming stage due to the characteristics of the medium, which puts forward high requirements on selecting valves. Metal seated ball valves can resist pressure and tension. However, if the moisture content is high during the chlorine treatment stage, it will corrode the sealing surface and valve spool, causing internal leakages of the valve, posing risks. Plastic-lined valves have good corrosion resistance, but there should not be negative pressure. If there is negative pressure, the fluorine-lined plastic layer in the inner cavity of the valve will be sucked and shelled, causing the valve to fail to be open and closed. Ceramic ball valves have the characteristics of anti-corrosion, and can also resist hot and cold shocks. They will not break when heated to more than 1000°C in the air, or rapidly cooled and then heated rapidly. By analyzing the liquid chlorine filling process and selecting a ceramic ball valve made from appropriate materials, this working condition can be met. Through technical exchanges with ceramic valve manufacturers and structural improvements to existing valves, it is possible for ceramic valves to be used in liquid chlorine filling.
In industrial production, many process operating media contain corrosive liquids and gases such as hydrochloric acid, sodium hypochlorite, and caustic soda. Affected by the particularity of the chemical production industry itself, if you want to ensure production quality, it is necessary to control the standards and specifications of the instruments in the production line. The types of instruments include process control and process detection. In order to ensure the operating status of the instruments, the selected instrument materials and forms must be processed according to high standards and strict requirements to ensure that the efficiency of chlor-alkali production can be improved.
Analysis of properties of ceramics
Generally speaking, the ceramic is mainly composed of natural products or compounds that are formed and fired at high temperatures. Essentially, this material belongs to a kind of inorganic non-metallic substance. When analyzing the characteristics of ceramics, they can be classified from two aspects, that is, structural ceramics and functional ceramics. Among them, the former mainly refers to a type of ceramic materials that can be directly applied to engineering structural materials to assist construction. The characteristics of this type of ceramics include good strength, high-temperature resistance, high elastic modulus, good thermal shock resistance, hardness and wear resistance. When classifying structural ceramics, they can be divided into three series, namely oxide series, non-oxide series and structural ceramic matrix composite series. Compared with the former, the characteristics of the latter include biological, electrical, magnetic, optical, chemical, superconducting, acoustic and many other characteristics. Different characteristics even have the function of transforming each other. With the continuous improvement of industrial production technology, the application of ceramics in the field of process production are getting wider and wider, and they fully rely on their production and processing advantages such as good hardness, high melting point, oxidation resistance, and good wear resistance, attracting the attention of more chemical companies and favored by processing industry procurement. Among all engineering materials, the stiffness of ceramics is the most suitable. The stiffness and hardness have the best advantages, and the hardness has even exceeded 1500hV, making ceramics the best choice for chemical production, especially chlor-alkali chemical production. According to industry reports, at this stage, thermal power generation, waste incineration, mining, papermaking, steel and metallurgy and other industries have begun to use products from ceramic valve manufacturers to support the smooth completion of processing operations in harsh chemical production environments and promote profits of chemical enterprise increased.
In industrial production of chlor-alkali, liquid nitrogen is often used as a material to assist production. From the perspective of production principles, the production of liquid nitrogen mainly relies on the control of properties of gas, that is, liquefying chlorine gas by applying pressure and reducing the ambient temperature. When analyzing liquid nitrogen, it can be found that liquid nitrogen with good purity does not corrode industrial production pipelines and even valves. However, when the amount of water contained in the raw chlorine gas is too high, corrosion will occur. In the on-site production of chlor-alkali industry, when the transportation pipelines and production lines run smoothly for a period of time, problems such as valve jamming will occur, accompanied by problems such as adjustment difficulties to varying degrees, causing the production line to be shut down for maintenance and affecting the operational efficiency of industrial production enterprises. Faced with the above situation, technicians need to dismantle the pipeline. After disassembly, they will usually find that a large amount of black or brown substances will accumulate at the valve position. The accumulated substance contains a large amount of ferrous and trivalent iron. After sorting out the reasons for this, technicians believe that when the moisture contained in the production system is too much, it will begin to corrode the pipeline. As the degree of corrosion deepens, the rust in the pipeline will begin to fall and slowly accumulate. As the liquid nitrogen flows, it flows uniformly to the valve, causing the valve to fail.
Generally speaking, when filling liquid nitrogen, the process procedures that flow through are very complex, requiring technicians to ensure the safety and reliability of the filling site. In particular, they need to do a good job in the management of automatic shut-off valves and regulating valves to ensure closing at the critical moment. The pipeline has high pressure, low temperature and negative pressure during the vacuuming stage due to the characteristics of the medium, which puts forward high requirements on selecting valves. Metal seated ball valves can resist pressure and tension. However, if the moisture content is high during the chlorine treatment stage, it will corrode the sealing surface and valve spool, causing internal leakages of the valve, posing risks. Plastic-lined valves have good corrosion resistance, but there should not be negative pressure. If there is negative pressure, the fluorine-lined plastic layer in the inner cavity of the valve will be sucked and shelled, causing the valve to fail to be open and closed. Ceramic ball valves have the characteristics of anti-corrosion, and can also resist hot and cold shocks. They will not break when heated to more than 1000°C in the air, or rapidly cooled and then heated rapidly. By analyzing the liquid chlorine filling process and selecting a ceramic ball valve made from appropriate materials, this working condition can be met. Through technical exchanges with ceramic valve manufacturers and structural improvements to existing valves, it is possible for ceramic valves to be used in liquid chlorine filling.
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