Nitrogen decompression energy saving effect is obvious

Nitrogen decompression energy saving effect is obvious

Watt customers are large food companies with milk powder, rice flour and cereals as their main products, and the products are exported to all over the world. The customer engineering department is responsible for equipment maintenance, repair, renovation and expansion. Their daily work always runs through the company's goal of high efficiency and energy conservation, providing the best equipment and efficient energy for the production department. Steam and other industrial gases are widely used in customer plants due to process requirements. After long-term technical exchanges and cooperation with Hangzhou Watt Energy Saving, the two sides have good trust and cooperation. Among them, in the case of solving the pressure control problem on the nitrogen supply system for customers, Watt PRV2000 pressure reducing valve and other products have played a role in energy conservation and efficiency, saving a lot of money and manpower.

The customer needs a complete nitrogen supply system. The supply of nitrogen is provided by the nitrogen generator as the usual main supply system, and the nitrogen storage system is the backup system. If the system is operating normally, the supply pressure of the nitrogen generator is 5 Barg. However, when the amount of nitrogen is too large, the supply pressure of the nitrogen generator will decrease. When the pH is <4.2 Barg, the solenoid valve is opened, and the liquid nitrogen is vaporized and then replenished into the system through decompression to ensure the nitrogen consumption of the system.

Some time ago, due to problems with the nitrogen-reducing pressure reducing valve, the nitrogen supply pressure increased and the liquid nitrogen consumption increased greatly. The customer engineer replaced the old one with a new type of pressure reducing valve of the same type. After the operation, the nitrogen consumption was still high, and the supply pressure was also high and low.

Mr. Tee Bah Chih, Engineering Manager, attaches great importance to this matter. At his request, Watt energy-saving engineers and customer Wang Gong conducted a detailed system analysis and found that the pressure relief valve control pressure is the key to the problem. The downstream pressure PF of the original pressure reducing valve fluctuates with the fluctuation of the upstream pressure PE, and the adjustment deviation is large.

There are two factors that cause the pressure fluctuation on the upstream of the upper pressure reducing valve: 1. The pressure PJ in the nitrogen storage tank is maintained at 6.5 to 7 Barg, but it will cause pressure fluctuation due to vaporization, heat dissipation or other reasons; 2. Vaporizer The vaporization process will also cause fluctuations in export pressure for some reason. Especially when the solenoid valve is opened frequently, the fluctuation will be greater. This fluctuation is inevitable due to system reasons.

If the pressure reducing valve cannot accurately control the pressure, when the upstream pressure increases, the downstream pressure also increases. When the pressure PH in the gas supply pipe rises, the nitrogen production of the nitrogen generator in the high pressure state decreases. Will lead to an increase in the use of liquid nitrogen.

In this case, Watt Energy recommends that Wang engineer replace the original imported pressure reducing valve with a Watt PRV2000 pressure reducing valve. The PRV2000 is a pilot diaphragm type pressure reducing valve. The induction tube of the pilot valve senses the fluctuation of the downstream pressure, controls the opening degree of the pilot valve according to the load condition, and then controls the opening degree of the main valve through the internal conduit to achieve the purpose of controlling the pressure. This type of decompression valve has high control accuracy, and it can accurately control the downstream pressure within +/- 0.1 Barg regardless of fluctuations in upstream pressure or load.

After a year of operation, the pressure control of the Watt PRV2000 pressure reducing valve is accurate, and the amount of liquid nitrogen is also reduced a lot. The careful Wang engineer calculated the account: After using the Watt PRV2000 pressure reducing valve, according to conservative estimates, the amount of nitrogen consumed per 1Kg of product produced is reduced by 2Kg, which saves about 150,000 yuan per year. How much is this? A considerable number!

Every time the problem arises, it is the inspection of the performance of the professional steam valve products of Hangzhou Watt Energy Saving Engineering Co., Ltd.; the success of each cooperation makes the customers trust the Watt energy-saving employees.

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