Recently, a food processing plant in Jilin fire caused a lot of people's attention, a few days ago, Refrigeration Express reporter on the relevant refrigeration system security on the self-control valve (valve) pieces related issues interviewed the internationally renowned companies Danfoss and Parker Hann Fen and other related business person in charge. Mr. Xiao Lun, manager of Danfoss industrial refrigeration market in China and the Asia-Pacific region (valves and pumps), said that the safety of the refrigeration system is very important because the higher pressure and alternating temperature in the operation of the refrigeration system may bring to the system Safety risk, at the same time have a lower temperature and a certain pressure refrigerant liquid or gas leakage is also a refrigeration system, a security risk. In addition, the other components of the refrigeration system and the surrounding factors (such as the flammability of insulation materials, non-standard operation of the installation and maintenance work and many other reasons) are also issues that refrigeration system safety can not be ignored. Therefore, the safety of the refrigeration system should be properly assessed: follow the relevant design specifications, take full account of the physical and chemical properties of the refrigerant itself, from the design / planning point of view to eliminate system risk; the use of stable and reliable high-quality refrigeration components to To ensure that the system can run in accordance with the design state; components installation and testing phase in strict accordance with the rules of implementation, the refrigeration system to minimize the risk of leakage through the refrigeration system to minimize the possible automatic control of the risk of uncertainty may be caused by man-made operational risks; refrigeration system The maintenance must strictly abide by the corresponding safety regulations, to eliminate any without the installation and maintenance work. In welding operation, special attention should be paid to the potential safety hazard caused by not emptying and flammable insulation materials. Reliable and stable safety valves should be installed on all pressure vessels in the system to avoid the risk of refrigeration system due to overpressure. Sexual insulation materials; the correct setting of safety protection and alarm devices / measures; the reasonable setting and maintenance management of safety escape routes; the complete emergency plan of production and business units; the serious implementation of emergency drills; the enhancement of employee safety publicity, education and training; Security capabilities. Manager Xiao then told the Refrigeration Express reporter, in many refrigerants, ammonia is a distinctive feature of the refrigerant. Is currently the most widely used refrigerant in large refrigeration systems worldwide. First, ammonia has good thermophysical properties and has excellent efficiency as a refrigerant. Second, ammonia is a natural working fluid, environmentally friendly, there is no damaging effect on the environment. At the same time, ammonia is also toxic and flammable. However, ammonia combustion zone and the explosion zone is narrower: in the air concentration of 11% to 14% can burn, the concentration of 16% to 25% in case of fire will cause an explosion. Ammonia has an irritating odor. When the concentration of ammonia reaches 300ppm or more, it will cause harm to the human body (the sensitivity of the human body to ammonia is 5 ~ 20ppm). In the event of ammonia leaks, there is relatively enough time for people to evacuate the site without any direct contact with ammonia and without other obstructions. Therefore, the rational and effective use and control of the refrigerant is one of the key factors to ensure the safety of the refrigeration system. The application of ammonia refrigeration system itself is not safer or more unsafe than other systems. Tasteless, non-toxic and non-flammable refrigerants may also cause accidents such as suffocation due to fire and leakage of the system building structure. The security of the system mainly depends on the design, installation and maintenance of the whole system and the supporting safety measures. Therefore, any refrigeration system must be fully tested and tested for safety. Ammonia refrigeration system design, "reduce the amount of ammonia charge" is a more clear direction, small charge type ammonia refrigeration system, ammonia / carbon dioxide lamination system and fan-cooled system are effective solutions. Parker Hannifin, director of sales Zhengxiliang recently with a fire and explosion in Jilin so that we pay more attention to regulate the operation and safety management of ammonia refrigeration system, for the accident in Jilin, as a refrigeration industry practitioners, we are also very shocked And regret. The cause of a fire accident is caused by a short circuit in the electrical circuit that ignites the surrounding combustibles, thereby detonating the refrigeration system. As a representative of the refrigeration business, I think the standard operation is an important guarantee to eliminate potential safety problems. From the safety point of the self-control valve, the aging of the sealing part, the quality defects of the valve itself, design defects and improper installation and maintenance may cause leakage of ammonia gas. The use of branded products and then regular maintenance of the replacement is to avoid ammonia leaks. If the refrigeration system detects the leakage of the self-controlled valve, how should the user deal with it to minimize the loss? Firstly, the safety of production should be taken as the top priority for the enterprise and the monitoring of the operation of the system should be strengthened. This includes personnel monitoring and equipment Monitoring, there is disclosure of the situation can be found in time. Usually tiny leaks, people's sense of smell can be sensed, if there is leakage of self-control valve, if not the Explorer, you can first turn off the globe valve before and after, and then take measures according to the actual situation of the system, until the shutdown of the entire system. In addition, for some key positions, in the stage of system design, the pipes that can be manually adjusted in parallel in advance can be used to temporarily maintain the system during the time when the self-control valve is in trouble, and the maintenance of the self-controlled valves is completed After the reply automatically run. When ammonia leaks from the system, either the automatic control valve or the manual shut-off valve are switched off as much as possible. Manual shut-off valve as the mechanical structure, such as the valve body seal is no problem as long as the tight closed on the line; self-control valve to be considered different structures, normally open or normally closed and other factors, the need to consider the control valve on the system cut off safety factors. In an interview with the Refrigeration Express reporter Zheng Director also said that the safety issues related to the refrigeration system to surface and point particularly large, for the self-control valve should choose the quality of the brand (valves, pumps) valves, such as our Parker. Parker RS ​​self-control valve focused on industrial refrigeration ammonia system applications, from design and production of all aspects of quality control to prevent leakage. At present, although the number of self-controlled valve manufacturers at home and abroad, the quality difference is relatively large, select the time to pay attention to screening. Second, to ensure the correct specification of the installation, at present there are strong throughout the country, with the corresponding installation qualification of regular engineering companies, choose a strong installer is to ensure the correct installation of valves a strong guarantee. At present, our company and several well-known construction companies have cooperation, but also welcomed the cooperation of other contractors and Division I. Finally, it is proper use and routine maintenance. To prevent barbaric operations, we must also prevent unauthorized personnel from participating in it without authorization. Self-control valve in the refrigeration system at different locations bear different functions to ensure that the refrigeration system can achieve high automation. Such as high pressure part of the condensing pressure adjustment, high pressure to low pressure liquid expansion regulation, low pressure steam back to the gas pressure adjustment, compressor inlet pressure regulation, high and low pressure vessel level automatic control, solenoid valve automatically shut down and so on. If the customer does not have enough experience in refrigeration systems, in the choice of matching self-control valve advice on the proposed self-controlled valve manufacturer or design institute.
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