Sulfur resisting transform technique under low water / gas for gasifying powdered coal

A sulfur-resistant shift and process technology, which is applied to the sulfur-resistant shift process field of the first reactor, can solve the problems of heat not being taken out in time, high degree of methanation side reactions, low space velocity, etc., and achieves the effect of prolonging the service life.

Active Publication Date: 2007-10-10
青岛联信催化材料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual industrial operation results show that when the space velocity of the reaction is lower than 3000h -1 At this time, even if the ratio of water / gas is 0.27, which is much greater than the researched value of 0.20, because the reaction releases a large amount of heat and cannot be taken out in time, the accumulation of reaction heat will also lead to the occurrence of methanation side reactions, which will cause the bed temperature to rise rapidly.
Therefore, in actual industrial application, when water / gas=0.20, due to the low space velocity, it is impossible to achieve the effect of lowering the bed temperature, and at the same time, the degree of methanation side reaction is relatively high

Method used

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  • Sulfur resisting transform technique under low water / gas for gasifying powdered coal
  • Sulfur resisting transform technique under low water / gas for gasifying powdered coal

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Effect test

Embodiment 1

[0026] The crude gas from the "Shell" pulverized coal gasification process directly enters the gas-liquid separator, and the crude gas coming out of the top of the separator is heated to 190°C, enters the detoxification tank to remove impurities, and then enters the first reactor for shift reaction , the volume content of dry basis CO in the raw gas entering the first reactor inlet is 61%, the first reactor inlet temperature is 190°C, the water / gas volume is 0.15, and the space velocity is 6000h -1 , the reaction pressure is 3.0MPa, the hot spot temperature of the first reactor bed is 330°C, the shift gas CO content from one section is 45% relative to the dry basis, and enters the subsequent section for the shift reaction, and finally becomes a reaction by-product The amount of methane emitted is 0.01% by volume on a dry basis.

Embodiment 2

[0028] The crude gas from the "Shell" pulverized coal gasification process directly enters the gas-liquid separator, and the crude gas and water vapor from the top of the separator are heated together to 200°C, enter the detoxification tank to remove impurities, and then enter the first reaction In the first reactor, the volume content of CO on a dry basis in the crude gas entering the first reactor inlet is 63%, the first reactor inlet temperature is 200°C, the water / gas volume ratio is 0.20, and the space velocity is 7000h -1, the reaction pressure is 3.6MPa, the hot spot temperature of the first reactor bed is 380°C, and the shift gas CO content from one section is 40% relative to the dry basis, and enters the subsequent section for the shift reaction, and finally becomes a reaction by-product The amount of methane emitted is 0.3% by volume on a dry basis.

Embodiment 3

[0030] The crude gas from the "Shell" pulverized coal gasification process directly enters the gas-liquid separator. The crude gas from the top of the separator and the water vapor from the medium-pressure boiler are heated together to 190°C and enter the detoxification tank to remove impurities. , into the first reactor for shift reaction, wherein the dry base CO volume content in the crude gas entering the first reactor inlet is 69%, the water / gas volume ratio is 0.18, the first reactor inlet temperature is 190°C, and the water gas The volume ratio is 0.20, the space speed is 7000h -1 , the reaction pressure is 3.6MPa, the hot spot temperature of the first reactor bed is 355°C, and the shift gas CO content from one section is 50% relative to the dry basis, and enters the subsequent section for the shift reaction, and finally becomes a reaction by-product The emission of methane is 0.12%.

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Abstract

This invention relates to a process for gasifying pulverized coal at a low water/gas ratio by sulfur-tolerant conversion. The process comprises: introducing crude coal gas into a gas-liquid separator, heating the crude coal gas exhausted from the separator top to 180-220 deg.C, removing impurities, sending to a first reactor, and performing sulfur-tolerant conversion. In the first reactor, the water/gas volume ratio at the inlet is 0.15-0.20; the temperature at the inlet is 180-220 deg.C; the hot-point temperature of the bed layer is 330-400 deg.C; the space velocity is 6000-9000 h-1; the reaction pressure is 3.0-4.0 MPa; the CO volume content in the crude coal gas at the inlet is 55-70%. The process has such advantages as low water/gas ratio and low energy consumption.

Description

technical field [0001] The present invention relates to a pulverized coal gasification low-water / gas sulfur-resistant conversion process using coal as raw material, that is, a sulfur-tolerant conversion process for production of ammonia synthesis gas, oxo synthesis gas and city gas by Shell pulverized coal gasification, specifically relates to a A sulfur-tolerant shift process for the first reactor that uses crude gas as raw material and uses Shell pulverized coal gasification to produce ammonia synthesis gas, carbonyl synthesis gas and city gas. Background technique [0002] Since the beginning of the 21st century, due to the impact of increasingly tense oil resources, my country's coal chemical industry has entered a stage of rapid development. Projects such as coal gasification to ammonia, methanol to methanol, and coal to gasoline have been fully launched, and many have been introduced in succession. Set Dutch Shell company to develop pulverized coal gasification process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K3/02
Inventor 纵秋云刘捷马勇
Owner 青岛联信催化材料有限公司
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