Device and method for large-scale coproduction of synthetic ammonia and LNG from coke-oven gas
A co-production and coke oven gas technology, applied in liquefaction, gas fuel, refrigeration and liquefaction, etc., can solve the problems of high energy consumption and low recovery rate of raw material gas, and achieve the effect of reduced energy consumption and high recovery rate of the system
Pending Publication Date: 2022-02-18
HANGZHOU ZHONGTAI CRYOGENIC TECHNOLOGY CORPORATION
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[0007] The purpose of the present invention is to solve the technical problems of high energy consumption and low recovery rate of raw material gas in coke oven gas to LNG technology, and to provide a large-scale coke oven gas combined production of synthetic ammonia and LNG device and method
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[0038] The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and specific embodiments. The technical features of the various implementations in the present invention can be combined accordingly on the premise that there is no conflict with each other.
[0039] Such as figure 1 As shown, as a preferred embodiment of the present invention, a large-scale coke oven gas combined production of synthetic ammonia and LNG device is provided, and its main components include a low-pressure denitrification tower 1, a high-pressure nitrogen washing tower 2, and a main heat exchanger 3. Nitrogen-enriched tail gas compressor 7 and refrigerant refrigeration system. Among them, the low-pressure denitrification tower 1, the high-pressure nitrogen washing tower 2, and the main heat exchanger 3 are all located in the cold box 4, and the nitrogen-enriched tail gas compressor 7 is located outside the cold box 4. The refrigerant refrig...
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The invention discloses a device and method for the large-scale coproduction of synthetic ammonia and LNG from coke-oven gas, and belongs to the field of cryogenic separation equipment. The tower top refrigeration modes of the high-pressure dehydrogenation tower and the low-pressure denitrification tower adopt a washing process instead of a condensation process, so that the system energy consumption of the whole factory is greatly reduced; and the tower top tail gas of the low-pressure dehydrogenation tower does not go out of a boundary area and is merged into the synthesis gas after pressurization, and the feed gas recovery rate is high. Compared with the prior art, the device and the process method are particularly suitable for the condition that raw material gas is coke-oven gas or semi-coke tail gas with high nitrogen content, the raw material gas entering the cryogenic liquefaction unit mainly comprises hydrogen, nitrogen and methane, and hydrogen and nitrogen in the raw material gas are used for synthesizing ammonia through separation and liquefaction treatment of the process, methane is liquefied after being separated and is used as a product LNG, and the device has no by-product and is completely utilized.
Description
technical field [0001] The invention belongs to the field of cryogenic separation equipment, and in particular relates to a large-scale coke oven gas combined production device and method for synthetic ammonia and LNG. Background technique [0002] At present, domestic LNG raw material gas sources are mainly divided into several main process routes such as pipeline natural gas to LNG, coke oven gas to LNG, and coal to gas to LNG. Among them, the classic process of the pipeline natural gas liquefaction process is the single mixed refrigerant process (SMRC), and the refrigeration unit is mainly configured with a mixed refrigerant compressor and a cold box. The conventional process of making LNG from coke oven gas is as follows: a mixed refrigerant compressor provides the main cooling capacity for the device, and a nitrogen circulation compressor provides cold sources for the top of the high-pressure rectification tower and low-pressure rectification tower that separate the raw...
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IPC IPC(8): F25J3/02C10L3/12C01B3/50
CPCF25J3/0223F25J3/0233F25J3/0257F25J3/0252C10L3/12C01B3/506F25J2210/14F25J2215/20F25J2215/60F25J2270/90F25J2215/04F25J2270/66F25J2270/18F25J3/0276F25J2205/30F25J2215/02F25J2245/42F25J2245/02F25J3/0219
Inventor 章有虎苟文广
Owner HANGZHOU ZHONGTAI CRYOGENIC TECHNOLOGY CORPORATION