Conversion technique in high pressure and entire low temperature of 'fixed bed in normal pressure' for preparing ammonia in mode of intermittent gasification

A fixed bed, normal pressure technology, applied in the field of conversion technology, can solve the problems of slow conversion reaction equilibrium, low conversion efficiency of conversion reaction products, large volume of equipment in the ammonia synthesis system, etc., to achieve increased speed, reduced equipment volume, The effect of volume reduction

Active Publication Date: 2005-10-26
TIANJI COAL CHEM IND GROUP
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Problems solved by technology

[0010] The invention solves the problems caused by low pressure and "medium-low" and "medium-low-low" shifting temperatures in the conversion process of the existing "atmospheric fixed bed" intermittent gasification ammonia production process, that is, more energy consumption, The conversion efficiency of the shift reaction product is low, the volume of equipment used in the ammonia synthesis system is relatively large, the speed of the shift reaction to reach equilibrium is relatively slow, and the follow-up process consumes more power and equipment. A "normal pressure fixed bed" intermittent gas High-pressure full-low temperature shift process for chemical ammonia production

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  • Conversion technique in high pressure and entire low temperature of 'fixed bed in normal pressure' for preparing ammonia in mode of intermittent gasification

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Embodiment 1

[0015] "Atmospheric fixed bed" intermittent gasification ammonia production high-pressure full low-temperature conversion process, using coal as raw material to obtain raw material gas (containing CO, CO 2 、H 2 、CH 4 and H 2 S, N 2 、CS 2 etc.), after exchanging heat with the medium-pressure waste boiler, the temperature of the raw material gas reaches 230°C, and a compressor with good corrosion resistance is selected to directly compress the raw material gas to 3.6Mpa, and then sent to the first shift furnace (the first shift The upper part of the furnace is equipped with the existing high-strength and large-void adsorbent for oil absorption and dust removal and the high-strength sulfur-resistant shift deoxidizer, and the lower part is equipped with a sulfur-resistant shift catalyst with stable structure and high hydrolysis function purchased from the Catalyst Factory of Shandong Qilu Petrochemical Research Institute. ) and enter the furnace into high-pressure steam (water...

Embodiment 2

[0017] The "atmospheric fixed bed" intermittent gasification ammonia production process is a high-pressure full-low temperature conversion process. Coal is used as raw material to obtain raw material gas by "atmospheric fixed bed" intermittent gasification method. After heat exchange with medium-pressure waste boiler, the raw material gas When the temperature reaches 220°C (or 240°C, 250°C), select a compressor with good corrosion resistance to directly compress the raw material gas to 3.2Mpa (or 3.5Mpa, 3.8Mpa, 4.0Mpa), and send it to the first shift furnace ( The upper part of the first shift furnace is equipped with the existing high-strength and large-void adsorbent for oil absorption and dust removal and the high-strength sulfur-resistant shift deoxidizer, and the lower part is equipped with a high-hydrolysis sulfur-resistant shift catalyst purchased from Weifang Lianxin Chemical Co., Ltd. ) and enter the furnace into high-pressure steam (water / gas 0.3-0.4, which is a conv...

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Abstract

The present invention relatesto a high-pressure fall-low-temperature shift conversion process for making ammonia by using coal as raw material and utilizing 'normal pressure fixed bed' intermittent gasification. Said process includes two shift conversion procedures, the pressure of conversion gas of shift conversion procedure is 3.0-4.0 MPa, and the gas inlet temperature of 'first shift conversion' is 210-250 deg.C and the gas inlet temperature of 'second shift conversion' is 200-230 deg.C. The shift conversion process adopts sulfur tolerant shift conversion catalyst with stable structure and high hydrolysis function.

Description

technical field [0001] The invention relates to a conversion process in an ammonia production process using coal as a raw material, in particular to a high-pressure all-low temperature conversion process using coal as a raw material "atmospheric fixed bed" intermittent gasification to produce ammonia. Background technique [0002] At present, the production methods of producing raw material gas for synthetic ammonia from coal mainly include pressurized gasification of "Texaco" coal water slurry, pressurized gasification of "Luki" pulverized coal, and pressurized gasification of "Scher" pulverized coal. And "atmospheric fixed bed" intermittent gasification, etc. Among them, due to the high cost of pressurized gasification gas production methods such as "Texaco", "Luqi" and "Scher", domestic enterprises seldom use them. Small and medium-sized chemical fertilizer plants in my country mostly use the "atmospheric fixed bed" intermittent gas production method with less investment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/12
Inventor 路安华张连顺纵秋云赵立贤荆宏建王光彪李晓赵焰飞贾开田
Owner TIANJI COAL CHEM IND GROUP
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