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A process device and method for recovering cold energy from lng produced from coke oven gas

A technology for coke oven gas and process equipment, which is applied in refrigeration and liquefaction, cold treatment separation, liquefaction and other directions, can solve the problem of reducing the power consumption utilization rate of refrigerant compressor units, and achieves reduction of total project investment, reduction of floor space, Increase the effect of localization

Active Publication Date: 2018-03-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the case of producing LNG from coke oven gas containing a large amount of hydrogen and nitrogen, the non-methane components in the process gas carry a large amount of low-temperature energy. reduce

Method used

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  • A process device and method for recovering cold energy from lng produced from coke oven gas

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Embodiment Construction

[0010] A process device for recovering cold energy from coke oven gas to LNG, such as figure 1 As shown, it includes: heat exchanger 1, coaxial compression expander 2, liquid separation tank 3, LNG return pump 4, dehydrogenation tower 5, throttle valve 6, reboiler 7, etc., wherein:

[0011] The first outlet 8 of the heat exchanger 1 is connected to the inlet of the compression end of the coaxial compression expansion machine 2, the second outlet 9 of the heat exchanger 1 is connected to the inlet of the expansion end of the coaxial compression expansion machine 2, and the coaxial compression expansion machine 2 The outlet of the expansion end of the heat exchanger 1 is connected to the first cold flow channel 10; the third outlet 12 of the heat exchanger 1 is connected to the inlet of the liquid separator tank 3, and the gas phase outlet of the liquid separator tank 3 is connected to the outlet of the heat exchanger 1. The second cold flow channel 11 is connected, the liquid p...

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Abstract

The invention discloses a process device and a process method for recovering cold energy from LNG prepared from coke oven gas. The device comprises a dehydrogenation tower, an LNG reflux pump, a coaxial compression expander, a liquid separation tank and a heat exchanger, wherein the heat exchanger is sequentially connected with the dehydrogenation tower, the LNG reflux pump, the coaxial compression expander and the liquid separation tank; and a feed port at the top of the dehydrogenation tower is sequentially connected with the heat exchanger and the LNG reflux pump. The process device and the process method disclosed by the invention have the beneficial effects that hydrogen-rich gas cold energy recycling and expander refrigeration are adopted to recycle the cold energy from a device for LNG prepared from the coke oven gas; part of the cold energy is provided for LNG and a mixed refrigerant by use of low-temperature hydrogen-rich gas removed from the coke oven gas; and meanwhile, reheated hydrogen-rich gas enters the heat exchanger again by throttling expansion to provide the cold energy until the hydrogen-rich gas enters the coaxial compression expander at normal temperature. The process device is simple in flow; the corresponding heat exchanger is only additionally provided with two flow channels, and the simplicity in operation is realized, power consumption of a refrigerant compressor unit can be greatly saved; and the hydrogen-rich gas can be flexibly disposed according to the downstream demand.

Description

technical field [0001] The invention relates to a process device and method for recovering cold energy from a coke oven gas LNG device in the coke oven gas LNG production process, especially for the small and medium-sized nitrogen-enriched gas LNG production device and method. Background technique [0002] Coke oven gas is a by-product of coking. Its main components are methane, hydrogen and nitrogen. It is a good chemical raw material and high calorific value fuel. The large-scale direct discharge of coke oven gas not only troubles enterprises and the government, but also wastes a lot of available resources. In order to solve the problem of comprehensive utilization of coke oven gas in small and medium-sized enterprises, the effective components of methane and hydrogen in coke oven gas are used as two resources. It is an inevitable choice to realize the comprehensive utilization of coke oven gas and the diversification of downstream products, fundamentally manage the envir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/02F25J5/00
CPCF25J3/0233F25J3/0223F25J3/0252F25J2200/02F25J2200/74F25J2210/14F25J2215/04F25J2270/04F25J2270/12
Inventor 孙林苏理林刘家洪黄勇汪贵白宇恒龙海洋田静郑颖
Owner BC P INC CHINA NAT PETROLEUM CORP
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