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Method for purifying HCN and COS in fuel gas produced from coal

A gas and coal-based technology, which is applied in the field of purification treatment of coal-based steelmaking gas, power generation gas and boiler gas, and can solve problems such as high operating temperature and difficulty in using sulfur-containing gas sources

Inactive Publication Date: 2007-10-10
HAISO TECH +1
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Problems solved by technology

The removal technology of HCN is relatively less researched, CN02131302.4, CN02131303.2, CN02131304.0 and CN02155489.7 and other patents to remove HCN catalysts are mainly precious metal catalysts such as platinum rhodium, adopt the method of oxidation to remove HCN has a high service temperature, generally around 400°C, and is difficult to apply to sulfur-containing gas sources; CN031242596 discloses an Al 2 o 3 Supported Cu catalyst removes the method for HCN, but this catalyst has no COS hydrolysis activity; CN02819926 has announced a kind of COS and / or HCN hydrolysis catalyst, and this catalyst is made from titanium oxide supported alkaline earth metal sulfate, has COS hydrolysis and HCN hydrolysis two Catalytic function, the hydrolysis rate is above 90%, but the catalyst carrier chooses relatively expensive titanium oxide

Method used

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  • Method for purifying HCN and COS in fuel gas produced from coal

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Embodiment Construction

[0015] The specific implementation of the coal-based gas purification method of the present invention in a certain factory is as follows: the crude gas obtained after coal gasification is cooled and dedusted by a ceramic filter, washed with water, and then heated to 170°C and enters the COS and HCN hydrolysis tower from the upper part, and the gas The content of COS in the medium is 135-270ppm, the content of HCN is 50-60ppm, and the interior is 32.7 meters 3 The above-mentioned active alumina carrier supports transition metal cobalt-molybdenum, or iron-molybdenum, or nickel-molybdenum, and a hydrolysis conversion catalyst of basic metal oxides, with an aspect ratio of 2.3 and a space velocity of 2600 hours -1 , the outlet gas at the bottom of the tower is cooled to 40°C by a heat exchanger, and then enters the desulfurization tower equipped with iron oxide fine desulfurizer, and the purified gas can enter the gas turbine. On-site testing shows that the conversion rate of COS ...

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Abstract

This invention discloses a method for purifying HCN and COS in coal-prepared fuel gas. The method relates to hydrolytic conversion of HCN and COS of coal-prepared steelmaking fuel gas, electricity-generation fuel gas, or boiler fuel gas in the presence of the same catalyst. The catalyst is Co-Mo, Fe-Mo or Ni-Mo or Ni-Mo, and alkali metal oxide supported by active aluminum oxide carrier, and used at a temperature of 50-400 deg.C and a space velocity of 500-30000 / h. The method has can effectively remove HCN and COS with the conversion rates both higher than 90%. The method thus can realize environmentally friendly exhaust of gas turbine.

Description

Technical field: [0001] The invention belongs to the field of coal chemical industry and electric power energy, and specifically mainly relates to a purification treatment method for coal steelmaking gas, power generation gas and boiler gas. Background technique: [0002] As people's requirements for the environment are getting higher and higher and the demand for electricity is increasing, clean coal technology, especially integrated gasification combined cycle power generation (IGCC) has been vigorously developed and valued. The purification of coal-based gas is an important link to improve power generation efficiency and meet environmental protection requirements, among which the removal of COS and HCN is particularly critical. [0003] The coal gas produced by coal gasification contains COS and HCN with a volume fraction of 0.01% to 1%. COS usually needs to be hydrolyzed to H 2 Removal after S, at present, domestic and foreign technologies are relatively mature, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/34
Inventor 孔渝华王先厚胡典明刘华伟肖安陆钱胜涛李木林张清健雷军陈健王贤超
Owner HAISO TECH
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