Chlor-alkali production pipeline system, the medium is usually a strong acid and alkali (caustic soda, hydrochloric acid) hydrogen, chlorine, hydrogen chloride, acetylene gas, etc. They are explosive, flammable, toxic and harmful substances, such as chemical valves run leaking, not only Affect production safety, involve personal safety, and seriously pollute the environment. A modern chlor-alkali chemical company uses thousands of different chemical valves, the fluid in the pipeline (liquid, gas) switch and control rely entirely on these chemical valves to complete, at the same time these thousands of valves and run leaking The main source, so how to choose chlor-alkali chemical safety valve on the chlor-alkali business is of great importance. The following describes the selection of chlor-alkali chemical valve experience: 1) respect for design institutes, combined with their own conditions and experience do not superstitious Design Institute. Design Institute of Chlor-Alkali chemical valve based on bias theory and previous data, the old designer more experience, theory and practice better. Young design is easy to copy behind to copy away from the actual business. For example, more than 20 sets of plastic-lined rubber butterfly valves (DN200 \ DN250 \ DN300) have been designed in salt water pipeline design institutes and often lead to torn or rolled rubber linings, resulting in frequent parking and replacement. Later, our company combined with "Beijing Aerospace Petrochemical Fluoroplastic Valve Co., Ltd." to innovate and extend the fluorine-filled butterfly valve to replace more than 20 rubber-plastic all-plastic butterfly valves and finally changed the passive situation of frequent replacement. 2) Select chemical valve manufacturer with good product quality and rich design experience as a long-term close partner and establish a regular technical exchange hotline. Chlor-alkali production enterprises are mainly produced, the valve is purchased from the manufacturer there, such as the two only stay in the relationship between the sale, the chemical valve selection is not good, less reliable production safety and reliability, we choose long-term Partners and establish a technical exchange hotline before each procurement, each project before the implementation, with several partners to carry out frequent technical exchanges and exchanges to ensure that the actual selection. (1) Beijing Aeronautic Aerospace Petrochemical Fluorine Valve Co., Ltd. is the practice of selling chemical valve products at the same time sell the technology, the user first to carry out technical exchanges, design and manufacturing to pay, so that users feel all transparency, heart steadfast; (2) Beijing Aeronautic Aerospace Petrochemical Fluoroplastic Valve Co., Ltd. is a research and design and manufacture of high-tech enterprises, a strong ability of independent innovation, and constantly put first-class aerospace technology for valve improvement and innovation, and continue to help users solve problems and problem. For example: in the pipeline after the original design using DN200 butterfly valve, often problems, after Beijing Aeronautics and Astronautics Fluoroplastic Valve Co., Ltd. site investigation of the technical staff that the pump pressure is high, large pulsation, the use of rigid rubber liner poor Butterfly valve, poor stability, disc can not seal, it is proposed to adopt the new patented technology - double sealed fluorine globe valve. But the butterfly valve to replace the cut-off valve pipeline requires major changes, the scene workers are reluctant to change, Beijing Aerospace Petrochemical Fluoroplastic Valve Co., Ltd. technicians repeated on the importance of using new technologies, not only to ensure safe and reliable production, But also reduce the labor intensity in the future, a change, long-term benefit, change the line work quickly and smoothly, this station has since achieved long-term and reliable work. 1 Chlor-Alkali Chemical Valve Selection Specific Experience Introduction Chlor-alkali production electrolysis process is characterized by strong corrosion in the environment, but the pressure is medium and low pressure (10k) temperature is usually below 90 ℃, so the overall selection of diaphragm ideal, the introduction of Japan Diaphragm valve system accounts for more than 90%, the specific technical requirements are as follows: 1) Model: plastic plastic diaphragm valve or steel diaphragm valve; 2) Body Material: Plastic plastic diaphragm valve body material is PVDF. Lining PVDF valve body material: Lining PVDF (long service life, is lining F46 3 times, overhaul can be reused after use) Lining F46 (soft material, formed by the diaphragm after the formation of grooves ditch, the opening can not be reused . 99% of domestic valve manufacturers use F46, Beijing Aerospace Petrochemical Fluoroplastic Valve Co., Ltd. Aerospace PVDF) 3) Diaphragm material The quality of the diaphragm valve is good or bad The key material in the diaphragm material, the diaphragm material imported from Japan for PTFE (four At present, 99% of valve manufacturers in China use F46 (work durability of 1000 to 4000 times), our company adopts domestic PTFE material (PTFE material, working life of folding endurance 50,000 to 300,000 times) Standard production of PTFE (DN15-DN250) diaphragm manufacturers Beijing Aeronautic Aerospace Fluoroplastic Valve Co., Ltd.. (1) large pump pressure pulsation, the use of double-sealed steel-lined PVDF globe valve more reliable; (2) long-term use of fluorinated ball valve with fluorine fluorine butterfly valve leakage due to wear and deformation, the use of attention; Plastic rubber butterfly valve should not be used in an important position; (4) Pneumatic cut-off valve and pneumatic control valve actuator cylinder than the use of long life, work more reliable. 2 common alkaline medium chemical valve material selection In the concentration of 32 ° below the ordinary caustic soda medium, when the operating temperature ≤ 90 ℃ conditions PVDF (polyvinylidene fluoride), RPP (enhanced polypropylene) and ordinary stainless steel (304, 316) can be used normally. Concentrated caustic soda (concentration 49% ~ 51%) medium chemical valve material selection. 2.1 High nickel stainless steel 6-CS-18 valve in the use of concentrated caustic soda In the production of chlor-alkali, with the increase of caustic soda concentration, the medium temperature has also increased, close to 120 ℃ ~ 150 ℃, at this time on the valve material put forward high requirements, high Nickel stainless steel is the right choice, but the high nickel stainless steel with the nickel content is too high, the company can not afford, which gives the valve manufacturer a subject, the performance of the valve selection to meet the requirements, while the nickel content is not Will be too high, after the investigation and study selected SCS-18 stainless steel, the steel containing 21.1% nickel. Casting a small amount of nickel content of volatile, the finished nickel content can basically be maintained at about 20%, I use SCS-18 material ball valve, globe valve, through the long-term actual use of SCS material proved to be able to withstand strong valve caustic test. 2.2 lining F46 (F4) globe valve in the use of concentrated caustic soda in the evaporation concentration of caustic soda concentration reached 49% ~ 51%, while the temperature also reached about 150 ℃, in this work environment using high-nickel stainless steel SCS-18 valve Is reliable, but the purchase cost is about two to three times higher than that of the steel liner F46 (F4). With the idea of ​​cost reduction, we discussed with the valve manufacturer three years ago whether the steel-lined F46 (F4) valve could be adopted. In addition to the molten state of sodium metal corrosion of its products have some, F46 (F4) resistant to concentrated alkaline performance is good, and can work long-term below 205 ℃, through the F46 (F4) performance analysis found lining F46 (F4) valve at 150 ℃ concentrated caustic soda can work properly, it had boldly tried, through several years of operation, proved DN50 lining F46 globe valve work in this work environment is reliable. In short, the actual use shows that the rational selection of chlor-alkali chemical valves, both to reduce costs and safe operation.
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