Twins Nestle Co., Ltd. is a branch of the world's top 500 Swiss Nestle company, located in Shuangcheng, Heilongjiang Province. It is a large-scale food enterprise mainly producing milk powder, rice noodles and cereals. The products are sold all over the world. Twins Nestle Nestle company has always uphold the advanced management philosophy, advanced production equipment, strong technical force. Twins Nestlé Engineering Department is responsible for the equipment maintenance, repair, alteration and expansion of Twin Cities Nestle. Their daily work always runs through the company's goal of energy conservation and energy conservation, providing the best production equipment and efficient energy for production departments. Due to the needs of the process, steam and other industrial gases have been widely used at the Shuangcheng Nestle factory. After a long period of technical exchanges and cooperation, Spirax Sarco Harbin Office and Twins Nestlé established a good relationship of trust and cooperation. Among them, in order to solve the problem of pressure control on the nitrogen supply system for Nestlé Nestle, Spirax Sarco's products have played a role of energy-saving and energy-saving, saving a lot of money and manpower. Legend: A-N2 Generator Nitrogen Generator B-Liquid N2 Tank Liquid Nitrogen Tank C-Liquid N2 Vaporizer Liquid Nitrogen Vaporizer D-Press Reduce Valve Pressure Reducing Valve E, F-Pressure Gauge Pressure Gauge G-Safety Valve Safety Valve H- Pressure Sensor Pressure Sensor I-solenoid valve This is a complete nitrogen supply system. Nitrogen generator A is the usual main supply system, from B to I is a backup system. If the system is running properly, A's supply pressure is 5Barg. However, when the amount of nitrogen is too large, A, the supply pressure PH will drop, when PH <4.2Barg, the solenoid valve I open, vaporized by the C after the C vacuum decompression added to the system to ensure the amount of nitrogen in the system . Some time ago, due to the pressure relief valve D problems, resulting in nitrogen supply pressure, the amount of liquid nitrogen greatly increased. Nestlé engineer Wang Xuan Yu replaced the old one with a new type of pressure relief valve of the same type. After running, it found that the amount of nitrogen was still high and the supply pressure was also high and low. Mr. Tee BahChih, Engineering Manager, attached great importance to this issue. At his request, I conducted a detailed systematic analysis with the king, and found that pressure relief valve control pressure instability is the crux of the problem. The original pressure reducer downstream pressure PF will fluctuate with the upstream pressure fluctuations of PE, the adjustment deviation. After analysis, there are two factors that cause the pressure fluctuation upstream of the pressure reducing valve: 1. The pressure PJ in the nitrogen storage tank B is maintained at 6.5 ~ 7Barg normally, but it may cause pressure fluctuation due to vaporization, heat dissipation or other reasons ; 2, the vaporizer C vaporization process will also cause export pressure fluctuations for some reason. Especially when the solenoid valve is opened frequently, the fluctuation will be greater. Due to system reasons, this fluctuation is inevitable. If the pressure reducing valve can not precisely control the pressure, when the upstream pressure rises, the downstream pressure also increases. When the pressure PH in the gas supply pipe rises, the amount of nitrogen in the high-pressure nitrogen generator A will be Decline, it will lead to increased use of liquid nitrogen. In this case, I suggested that Wang Xuan Yu engineer replaced the original pressure relief valve Spirax Sarco produced 25 P pilot valve relief valve. This valve by the pressure sensing valve pilot feel downstream pressure fluctuations, according to the load control pilot valve opening, and then through the internal control of the main valve opening of the valve to achieve the purpose of controlling the pressure. This pressure reducing valve has high control accuracy and can accurately control the downstream pressure within +/- 0.1 Barg regardless of upstream pressure fluctuations or load changes. After a period of operation found: Spirax Sarco 25P pressure reducing valve pressure control accuracy, the amount of liquid nitrogen has also been reduced a lot. Careful Wang Xuan Yu engineer calculated an account: the use of 25P valve, according to conservative estimates, each produced 1Kg product consumption of nitrogen reduced by 2Kg, so that each year can save about 150,000 yuan more than the previous year, this is how Considerable number! Each time a problem arises, it is a test of the performance of Spirax Sarco; the success of each cooperation has given Twins Nestlé more confidence in Spirax Sarco products. Spirax Sarco is willing to contribute to the customer's energy efficiency.
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