Project Name: Wenxi Jinfeng coal chemical fertilizer plant 4800Nm3/hPSA PSA Hydrogen project
Project time: July 2014
Project location: Wenxi, China
Jinfeng coal chemical Wenxi fertilizer plant 4800Nm3/h with synthetic ammonia tail gas PSA pressure swing adsorption hydrogen project in July 2014 put into production, by Chengdu Huaxi Chemical Technology Co., Ltd. sets, use the Wuxi Kyle grams (kelk) a lot of program-controlled valves.
In the pressure swing adsorption device, the process system cycle to switch valve, and the number of valves, frequent action, manual operation is not carried out. Therefore pressure swing adsorption device is a highly automated device, using the valve has also has highly automated functions, to ensure the smooth progress of the whole process, so the long-term stability of the control valve operation to ensure the quality and output of products plays an important role.
Because of the special nature of the pressure swing adsorption process, the general valve and the universal regulating valve are used to ensure the reliable operation of the device for a long time. In the pressure swing adsorption device, the automatic valve using pneumatic butterfly valve (similar to the flat valve), also known as the control valve, the valve open and close by the program control to operate and with the valve position detection device. In view of the particularity of the PSA technology, this program control valve must meet the following requirements:
1, sealing performance is good, basically achieve zero leakage standard;
2, the valve opening speed, with the valve on the diameter of the different opening and closing time should be less than 3 seconds;
3, the valve requires long life to withstand long-term work and keep not leak;
4, can be used in flammable and explosive toxic gas environment;
5, with two-way pressure resistance and anti high speed airflow erosion performance;
6, according to the process requirements, easy to achieve the adjustment function and the status of the valve position display, on-site instructions and operating functions.
The Wenxi synthetic ammonia pressure swing adsorption process, the control valve using the Wuxi Kell three eccentric butterfly valve. Valve operating frequency is three times per minute, if the valve in accordance with the annual driving without maintenance conditions, the actual service life of Wuxi Kell valve is 1576800 times a year. The number of actions per month is up to 129600 times.
The three eccentric butterfly valve has the advantages of simple operation, high degree of automation, convenient operation and maintenance, designed for use life: 200 million times, due to the control valve has the advantages of simple structure, reliable operation, long life, the spool with nylon reinforced PTFE - stainless steel seal), good sealing performance, low failure rate, fully meet the requirements of the use of pressure swing adsorption process, so as to improve the automation degree of pressure swing adsorption device laid the foundation and improve the automation level of the whole device.
