Process for treating low-temperature condensate at conversion section

A low-temperature condensation and treatment process technology, applied in water/sewage treatment, heating water/sewage treatment, degassed water/sewage treatment, etc., can solve the blockage of pipelines and condensation systems, cannot be directly discharged, and condensate has no reception Users and other issues, to achieve the effect of reducing device energy consumption and reducing the content of H2S

Inactive Publication Date: 2015-04-08
CHINA TIANCHEN ENG +1
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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...

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  • Process for treating low-temperature condensate at conversion section

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Embodiment Construction

[0022] Attached below figure 1 The present invention is further described.

[0023] Low temperature shift condensate (13) from upstream with NH 3 The condensate at the bottom of the stripper (2) passes through the heat exchanger (16) and heats up to 90°C to enter the CO 2 At the top of the stripping tower (1), the clean condensate (15) produced during the heat exchange is sent out to the section; the vaporized high flash gas (14) enters the CO 2 The middle part of the stripping tower (1); the acid gas produced at the top of the tower is transported to the condensation separation device (6) through the connecting pipeline three (5), and is separated into condensate (7) and non-condensable gas ( 8), the condensate (7) is sent back to the gasification section (not shown in the figure); CO 2 The ammonia-rich condensate at the bottom of the stripper (1) enters the NH through the connecting line one (3) depending on the height difference. 3 The middle and upper part of the strip...

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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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Application Information

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IPC IPC(8): C02F1/02C02F1/04
CPCC02F1/20C02F1/02C02F1/04C02F1/048
Inventor 王辅瑞刘胜凯白洪涛郑康高志辉闫浩许骏
Owner CHINA TIANCHEN ENG
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