My first set of 12MPa high pressure hydrogen recovery cold box put into use
Hydrogen recovery load rate than the design value increased by 10%, energy-saving effect is remarkable
Central Plains Dahua synthesis device after the transformation of the new cold box (Lu Bailun)
Recently from the Central Plains Dahua Group Co., Ltd. was informed that the company and Hangzhou Foster SDG Equipment Co., Ltd., the use of domestic high-pressure aluminum plate-fin heat exchanger chemical cold box instead of imported products, hydrogen recovery of ammonia plant tail gas System for energy-saving success.
It is understood that the high-pressure cold box put into commissioning operation in March this year, after 10 months of assessment, operating conditions stable; hydrogen-rich product yield and purity and methane, nitrogen, argon removal results have reached the contract requirements; hydrogen recovery load The rate is 10% higher than the design value. It has the characteristics of high heat exchange efficiency, low energy consumption, compact structure, small footprint, flexible operation, short opening time and remarkable energy saving effect. It has filled the domestic blank in this field.
Niu Yuzhen, deputy general manager of Hangzhou FST Company, chief technology officer told reporters that the main technical indicators of high-pressure aluminum plate-fin heat exchanger chemical cold box: into the cold box tail gas volume of 17600Nm3 / h; fuel gas content of each component: Ar + O2> 3.378%, CH4> 15.38%, H2<18.9253% ;换热要求为: 尾气出口氮, 氩, 甲烷液化, 温度达-187℃;返流氢, 燃料气与尾气进口温差小于2℃;富氢量为12600Nm3/h, 富氢含氢量为89%, 从尾气中回收氢量大于96%;阻力要求尾气与返流氢阻力值小于0.2MPa.
Cold box reconstruction site cold box reconstruction site
Zhongyuan Dahua Ammonia Plant Director Wang Qingjie told reporters that the hydrogen recovery of cold box plant is an important ammonia synthesis system of energy-saving equipment. Ammonia recovery gas contains a lot of hydrogen, if the exhaust sent to do the fuel is a big waste In order to achieve the optimum value of hydrogen and nitrogen ratio in the ammonia synthesis system, hydrogen recovery treatment is needed.Existing hydrogen recovery unit cold box has been used abroad for more than 20 years and leaks many times with poor operating conditions and reduced performance After several overhauls, the cold box still could not meet the process design and energy saving requirements, therefore, Zhongyuan Dahua decided to upgrade the cold box.
Zhongyuan Dahua Fertilizer Division Wang Jianxin, general manager told reporters that after many visits, research and feasibility studies, Zhongyuan Dahua company determined with the Hangzhou Fossida Company, Wuxi Jialong Heat Exchanger Co., Ltd. to carry out joint research, creatively put forward Using high-pressure plate-fin heat exchanger instead of high pressure with wound-type heat exchanger technology transformation process program.
Niu Yuzhen told reporters that high-pressure plate-fin heat exchanger design difficulties are the choice of fin, plate beam structure design, two-phase flow distribution design, material selection and plenum chamber design. Cold box design is the temperature control difficulties, the process Organization, heat exchangers, separation equipment, purification of nitrogen, argon and methane, design of pipeline connections, etc. For the first time, FOSDAO has designed and manufactured a high-pressure plate-fin heat exchanger chemical cold box with a pressure of 12MPa in China, Cold box and only 10 meters high, covering 9 square meters.
Niu Yuzhen said that this innovation for the transformation of the Central Plains cold boxes innovation lies in the use of high-pressure plate-fin heat exchanger replaced with high-pressure heat exchanger, high-pressure plate-fin heat exchanger thermodynamic calculations, the intensity Calculation, structural design, etc. are independently developed by Foster Star, by Wuxi Jialong Heat Exchanger Co., Ltd. in strict accordance with the design of Fushida production.According to the operation of the entire process, Fu Sida in the raw material gas methane , The nature of the argon, the pressure after changing the throttle valve, and the pressure adjustment outside the cold box, so that the whole system can run smoothly, and the technical indicators of the cold box are better than the designed values.
'The replacement of a new cold box upgrades on China's other ammonia plant tail gas recovery system, energy-saving transformation, has an important promotion and reference.' Zhongyuan Dahua Group Chairman Zhang Lin said.
