Chilling cyclic CO (carbon monoxide) transformation process
A process and chilling technology, applied in the field of CO shift process, can solve the problems of short catalyst life, easy over-temperature of the shift furnace, large equipment investment, etc., to achieve the effect of longer service life, simplified process flow, and reduced consumption
Active Publication Date: 2014-06-25
SINOPEC NINGBO ENG +2
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to provide a chilled cycle CO shift process in view of the status quo of the prior art, so as to solve the problem that the shift furnace of the existing CO high water-gas ratio shift process is easy to overheat, the catalyst life is short, the energy consumption is high, the equipment A series of technical issues such as large investment
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[0023] This embodiment is used in conjunction with a typical fertilizer plant that produces 300,000 tons / year of synthetic ammonia and 520,000 tons / year of urea through gasification of Shell pulverized coal gasification.
[0024] Such as figure 1 As shown, the chilling cycle CO shift process includes the following steps:
[0025] The crude oil sent from the pulverized coal gasification unit has a temperature of 155°C to 165°C, a pressure of 3.65Mpa (G) to 3.75Mpa (G), a water / dry gas molar ratio of 0.18 to 0.19, and a CO dry basis molar content of 60% to 70%. The synthesis gas is first split into two streams. Among them, the first stream of crude synthesis gas accounts for about 20% to 30% of the total amount. It is heated to 225°C to 235°C by the crude synthesis preheater 8, and the 15% of the gas inhaled by the high-pressure steam ejector 1 is used to generate power. % to 25% of the first shift gas is mixed, enters the gas-liquid mixer 2 and mixes with the supplemented med...
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The invention relates to a chilling cyclic CO (carbon monoxide) transformation process. The chilling cyclic CO transformation process comprises the following steps: dividing crude synthesis gas sent by a pulverized coal gasifying unit into two parts; carrying out heat exchange on a first part of the crude synthesis gas and then mixing with high pressure steam and the first part of primary transformation gas, then replenishing medium pressure boiler fed water, and carrying out transformation reaction in a1# transformation furnace; dividing the obtained primary transformation gas into two parts, mixing a second part of the primary transformation gas with the replenished medium pressure boiler fed water and medium pressure steam, carrying out transformation reaction in a 2# transformation furnace; mixing the obtained secondary transformation gas with the replenished medium pressure boiler fed water after the obtained secondary transformation gas enters a gas-liquid mixer, and carrying out transformation reaction in a 3# transformation furnace. According to the chilling cyclic CO transformation process, the crude synthesis gas and the primary transformation gas are both divided into two parts respectively, concentration of CO entering the transformation furnace is effectively reduced, an operation temperature of the transformation furnace is reduced, the operation environment of a catalyst is mild, the service life of the catalyst and operational cycle of a device are prolonged, and energy saving and cost reducing effects are good.
Description
technical field [0001] The invention relates to a CO conversion process, in particular to a chilling cycle CO conversion process. Background technique [0002] In recent years, my country's coal gasification technology has made great progress, especially the pulverized coal pressurized gasification technology using waste heat boiler process, which has the characteristics of low coal quality requirements, high effective components in syngas, low operating costs and environmental friendliness. It is adopted by more and more large coal chemical plants in China. The crude synthesis gas produced by pulverized coal pressurized gasification technology in the waste heat boiler process usually has a CO dry basis volume content of more than 60% and a water vapor volume content of less than 20%. The crude synthesis gas has a significant low water vapor content and a high CO content. features. [0003] When the pulverized coal pressurized gasification technology in the waste heat boile...
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IPC IPC(8): C10K3/04C01B3/16
CPCY02P20/10
Inventor 邹杰许仁春徐洁顾怀攀张俊董清坤
Owner SINOPEC NINGBO ENG