Process for treating low-temperature condensate at conversion section

Abstract

The invention provides a process for treating low-temperature condensate at the conversion section. According to the process, a two-tower process of CO2 stripper series connected with an NH3 stripper is adopted for stripping of CO2 and H2S, and stripping and distillation of NH3. The process for treating low-temperature condensate at the conversion section effectively utilizes low-quality waste heat in a gasification device such as low flash gas, so that the energy consumption of the device is reduced, and the operation cost is greatly reduced; the method disclosed by the invention can be used for realizing the separation of acidy gas and NH3, solving the problems of no receiving users, ammonium salt crystallization and the like caused by overhigh sulfur content in ammonia obtained according to the existing processes, and finishing the receiving treatment of high flash gas of the gasification device; and based on the process disclosed by the invention, the NH3 content of waste water of an entire coal chemical device is effectively reduced, the environmental pollution is reduced, and the process is feasible and simple to operate, and has good economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to a waste heat utilization and acid gas comprehensive treatment process of a gasification device, in particular to a treatment process for low-temperature condensate in a transformation section. technical background [0002] In a coal gasification plant, the N in the coal 2 will react with the H produced during the gasification process 2 The reaction produces ammonia, which will be sent to the downstream conversion section along with the water gas, and the water gas will recover heat after the conversion reaction, so a large amount of condensate will be produced, especially in the low temperature section, a large amount of NH 3 It will be dissolved in the low-temperature condensate, and the condensate will be sent back to the gasification system, and this cycle will cause the ammonia content of the entire device to exceed the standard. [0003] In order to solve the above technical problems, many coal chemical companies have in...

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Problems solved by technology

[0004] The mixed gas at the top of the tower contains CO 2 、H 2 S and ammonia, in the subsequent condensation process, when the temperature decreases, CO 2 Ammonium salt crystals are easily formed with ammonia, causing blockage of the entire pipeline and condensing system, seriously affecting the stable operation of the conversion section; High H 2 S, so that the condensate at the top of the tower has no receiving users and cannot be directly discharged

[0005] So far, there has not been an effective, economical, and environmentally friendly method for treating ammonia in coal gasification units, so it is urgent to develop a new treatment process, especially a new shift condensate treatment process

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