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Pretreatment method and system of syngas for synthetic ammonia

A raw material gas and pretreatment technology, which is applied in the field of coal chemical industry, can solve the problems of reduced reaction efficiency, large consumption of useless work, and reduced net value of ammonia in ammonia synthesis equipment, and achieve the goal of increasing product added value, reducing the basis of regeneration energy consumption, and prolonging the service life. Effect

Pending Publication Date: 2020-09-08
XIAN SHAANGU POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The ammonia synthesis reaction in the ammonia synthesis plant is the core section of the whole plant, and it is also an important section that determines the energy consumption of the entire plant. The ammonia synthesis reaction has strict requirements on the N / H ratio and content of the raw material gas for ammonia synthesis. Impurity gases and inert gases such as methane and argon in the components will reduce the reaction efficiency of the ammonia synthesis unit and increase the energy consumption
[0003] At present, in the process of updating and eliminating the traditional normal-pressure coal gasification method in the country, the main components of the ammonia synthesis raw material gas produced by the new alternative coal gasification are: hydrogen (67%-72% by mole), nitrogen (22% by mole ~24%), methane (4% to 10% by mole), argon (0.4% to 0.6% by mole), water (saturated state), methane and argon do not participate in the reaction as inert gases in the ammonia synthesis section. The compression and reaction process of the system will consume a lot of useless work, which will increase the energy consumption of the system and reduce the net ammonia value of ammonia synthesis, which poses a severe challenge to the ammonia synthesis section of the ammonia synthesis plant

Method used

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  • Pretreatment method and system of syngas for synthetic ammonia
  • Pretreatment method and system of syngas for synthetic ammonia
  • Pretreatment method and system of syngas for synthetic ammonia

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Embodiment

[0082] The raw material gas of an ammonia synthesis section contains 4% to 10% by mole of methane and 0.4% to 0.6% by mole of argon. According to the requirements of the subsequent ammonia synthesis reaction, the methane should be removed to less than 1.5% by mole, and the argon should be used as much as possible. It may be removed, and the main volume percentage of the feed gas in the ammonia synthesis section is as follows:

[0083]

[0084]

[0085] The raw material gas for ammonia synthesis at room temperature and high pressure from the upstream section enters the first cooler 11, water eliminator 12 and drying tower 13 of the dehydration device 1 in order to cool the raw gas to 10-20°C and remove the moisture in the raw gas to 1ppmv, and then in the demercuration tower 14, the trace amount of mercury in the raw material gas is removed by soaking sulfur-based activated carbon to 0.01μg / Nm 3 . The raw material gas entering the cryogenic separation unit 3 guarantees H...

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Abstract

The invention discloses a pretreatment method and system of syngas for synthetic ammonia. The system comprises a dehydration device, a mercury removal device and a cryogenic separation device; the dehydration device is used for cooling and dehydrating the syngas; the mercury removal device is used for mercury removal and purification of the dehydrated syngas output by the dehydration device; the cryogenic separation device comprises a plate-fin heat exchanger group and is used for cooling the purified syngas output by the mercury removal device and outputting low-temperature purified syngas; and the cryogenic separation device further comprises a gas-liquid separation unit, the gas-liquid separation unit is used for carrying out gas-liquid separation on the low-temperature purified syngasoutput by the plate-fin heat exchanger unit to output low-temperature purified gas, and the low-temperature purified gas is heated by the plate-fin heat exchanger unit to obtain purified syngas for synthetic ammonia. Through reasonable arrangement of part structures, impurities in the syngas for synthetic ammonia are efficiently removed, and the impurity gas is made into a CNG product in a rectification and purification mode to be output, so the additional value of the product is increased; and meanwhile, circulating nitrogen is adopted for pressurization and expansion, so the energy efficiency is improved, and the overall device transformation cost and operation consumption are reduced.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method and system for pretreatment of feed gas for synthetic ammonia. Background technique [0002] The ammonia synthesis reaction in the ammonia synthesis plant is the core section of the whole plant, and it is also an important section that determines the energy consumption of the entire plant. The ammonia synthesis reaction has strict requirements on the N / H ratio and content of the raw material gas for ammonia synthesis. Impurity gases and inert gases such as methane and argon in the components will reduce the reaction efficiency of the ammonia synthesis unit and increase the energy consumption. [0003] At present, in the process of updating and eliminating the traditional normal-pressure coal gasification method in the country, the main components of the ammonia synthesis raw material gas produced by the new alternative coal gasification are: hy...

Claims

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Application Information

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IPC IPC(8): C01B3/04F25J3/02F25J3/04
CPCC01B3/04F25J3/0233F25J3/0285F25J3/048F25J3/04866C01B2203/1258F25J3/0276F25J3/0257F25J3/0219F25J2205/04F25J2270/42F25J2270/14F25J2230/32F25J2200/72F25J2210/20F25J2200/02Y02E60/36
Inventor 梁威刘海军李忙刚李腾董博王小宁王连喜柴自高张长江刘浩谢辉李杰唐小龙
Owner XIAN SHAANGU POWER
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