Carbon monoxide conversion system and method for coal water slurry gasification-to-methanol device

A carbon monoxide and conversion system technology, applied in chemical instruments and methods, inorganic chemistry, hydrogen/synthesis gas production, etc., can solve problems such as unreasonable heat utilization, high equipment investment, large gas load, etc., and achieve good energy integration effect, Reasonable use of waste heat and the effect of reducing gas load

Pending Publication Date: 2020-09-11
SINOPEC NANJING ENG & CONSTR +1
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Problems solved by technology

[0003] In the existing coal-to-methanol carbon monoxide shift process, the unconverted gas bypass pipeline is installed at the inlet and outlet of the shift furnace, which mainly has the following problems: (1) The heat utilization is unreasonable, and the unconverted gas is first heated by the crude gas preheater, It enters the follow-up cooling system through the bypass of the converter furnace, and the setting of the bypass pipeline is unreasonable, resulting in energy waste; (2) The gas load of the pipeline and equipment from the crude synthesizer pipeline to the inlet of the converter furnace is relatively large, and the equipment investment is high; ( 3) The catalyst in the detoxification tank has a large space velocity and a short service life

Method used

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  • Carbon monoxide conversion system and method for coal water slurry gasification-to-methanol device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 439105kg / h crude synthesis gas (mainly composed of CO, H 2 , CO 2 、H 2 S, H 2 O, etc., 6.25MPa), enter the first gas-liquid separator (1), the equipment operating temperature is controlled at 240 ° C, after gas-liquid separation, the top gas phase is divided into two gases, one of which accounts for 60% of the total gas volume After being heated to 260°C by the crude gas preheater (2), it enters the detoxification tank to remove impurities, and then enters the shift furnace for carbon monoxide shift reaction. This reaction is a strong exothermic process, and the temperature of the shift gas at the outlet of the shift furnace rises to After 390°C, after the crude gas preheater (2) is cooled to 350°C, it enters the medium-pressure steam superheater, superheats the saturated steam to 300°C and sends it to the external steam pipe network, and the transformed gas enters the medium-pressure steam generator Saturated steam (2.5Mpa, 31500kh / h) is produced as a by-product. Th...

Embodiment 2

[0029] 439105kg / h crude synthesis gas (mainly composed of CO, H 2 , CO 2 、H 2 S, H 2O, etc., 6.25MPa), enter the first gas-liquid separator (1), the equipment operating temperature is controlled at 245 ° C, after the gas-liquid separation, the top gas phase is divided into two gases, one of which accounts for 50% of the total gas volume , is heated to 280°C by the crude gas preheater (2), enters the detoxification tank to remove impurities, and then enters the shift furnace for carbon monoxide shift reaction. This reaction is a strong exothermic process, and the temperature of the shift gas at the outlet of the shift furnace rises to After 410°C, after the crude gas preheater (2) is cooled to 359°C, it enters the medium-pressure steam superheater, superheats the saturated steam to 300°C and sends it to the external steam pipe network, and the transformed gas enters the medium-pressure steam generator By-product saturated steam (2.5Mpa, 28500kh / h), the shifted gas is further...

Embodiment 3

[0031] 439105kg / h crude synthesis gas (mainly composed of CO, H 2 , CO 2 、H 2 S, H 2 O, etc., 6.25MPa), enter the first gas-liquid separator (1), the equipment operating temperature is controlled at 250 ° C, after the gas-liquid separation, the top gas phase is divided into two gases, one of which accounts for 40% of the total gas volume , is heated to 300°C by the crude gas preheater (2), enters the detoxification tank to remove impurities, and then enters the shift furnace for carbon monoxide shift reaction. This reaction is a strong exothermic process, and the temperature of the shift gas at the outlet of the shift furnace rises to After 430°C, after being cooled to 370°C by the crude gas preheater (2), it enters the medium-pressure steam superheater, superheats the saturated steam to 320°C and sends it to the external steam pipe network, and the transformed gas enters the medium-pressure steam generator Saturated steam (4.0Mpa, 18500kh / h) is produced as a by-product. Th...

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Abstract

The invention belongs to the technical field of coal chemical industry device process design optimization and waste heat recycling. The invention provides a carbon monoxide conversion system and method for a coal water slurry gasification-to-methanol device. In combination with the characteristics of partial conversion of carbon monoxide and energy utilization of a coal-to-methanol device, the technological process is optimized and built, crude synthesis gas from an upstream gasification device is divided into two streams, and one stream is heated by a crude gas preheater and then enters a conversion furnace through a detoxification tank to be subjected to a chemical reaction; and the other stream of non-shifted gas which does not participate in the reaction is used as mixing gas to be mixed with the shifted gas subjected to the reaction. And a good energy utilization effect is obtained while the process production requirements are met, and the investment cost is saved.

Description

technical field [0001] The invention belongs to the technical field of process design optimization of coal chemical plant and waste heat recovery and utilization, and relates to a carbon monoxide conversion system and method of a coal-water slurry gasification methanol production plant, in particular to the industrial application of the conversion technology to a methanol production device. Background technique [0002] The CO content in the crude synthesis gas from the upstream coal-water slurry gasification unit is relatively high, with a dry basis content of about 40% to 47%, and a high moisture ratio, generally between 1.3 and 1.5, and sometimes as high as 1.7. In the supporting conversion device technology of coal-water slurry gasification to methanol, it is necessary to convert CO and water into CO through the carbon monoxide shift catalytic reaction. 2 and H 2 , adjust the composition of the process gas so that it satisfies f=(H 2 -CO 2 ) / (CO+CO 2 )=2.0~2.15, then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/12F22G1/14
CPCC01B3/12F22G1/14C01B2203/0283C01B2203/061Y02P20/129
Inventor 兰荣亮谢东升马炯汪根宝王靓
Owner SINOPEC NANJING ENG & CONSTR
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