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Method for preparing liquefied natural gas from coke oven gas

A technology for liquefied natural gas and coke oven gas, applied in refrigeration and liquefaction, liquefaction, gas fuel and other directions, can solve the problems of high energy consumption of LNG products, complex liquefaction process, etc., and achieve convenient transportation and utilization, simple separation process, and convenient operation. Effect

Active Publication Date: 2012-09-05
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The typical composition of coke oven gas is shown in Table 1, which is quite different from the composition of conventional natural gas, in which the content of hydrogen and nitrogen is relatively high. Compared with conventional natural gas, the production of LNG products consumes more energy and the liquefaction process is more complicated.

Method used

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  • Method for preparing liquefied natural gas from coke oven gas
  • Method for preparing liquefied natural gas from coke oven gas
  • Method for preparing liquefied natural gas from coke oven gas

Examples

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Effect test

Embodiment 1

[0028] In this embodiment, LNG is produced by adopting two-stage throttling mixed refrigerant circulation and gas stripping method.

[0029] Such as figure 1 As shown, the process mainly includes a mixed refrigerant liquefaction system, coke oven gas cooling and hydrogen, nitrogen separation system; wherein the mixed refrigerant liquefaction system is a mixed refrigerant compression and throttling refrigeration system, which includes a mixed refrigerant compressor, Water cooler or air cooler, mixed refrigerant liquid pump, plate-fin heat exchanger; coke oven gas cooling and hydrogen, nitrogen separation system includes heavy hydrocarbon separation tank, gas-liquid separation tank and stripping tower, the stripping tower is not installed The reboiler and superheater simplify the structure of the tower, and control the purity of LNG by controlling the gas flow at the bottom of the stripping tower.

[0030] Its technological process is as follows:

[0031] Such as figure 1 Sho...

Embodiment 2

[0036] In this example, LNG is produced by nitrogen expansion refrigeration and gas stripping.

[0037] Such as image 3As shown, the process mainly includes nitrogen expansion refrigeration system, coke oven gas cooling and hydrogen, nitrogen separation system; wherein the nitrogen expansion refrigeration system is a nitrogen compressor, cooler, turbo expander, and coiled heat exchanger; The coke oven gas cooling and hydrogen and nitrogen separation system includes a heavy hydrocarbon separation tank, a gas-liquid separation tank and a stripping tower. The stripping tower is not equipped with a reboiler and superheater, which simplifies the tower structure. By controlling the gas flow at the bottom of the stripping tower, Control the purity of LNG.

[0038] Such as image 3 Shown: will contain H 2 , N 2 The qualified purified coke oven gas is cooled by the heat exchanger E-100, and enters the heavy hydrocarbon separation tank V-103 for heavy hydrocarbon separation; then t...

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Abstract

The invention discloses a method for preparing liquefied natural gas from coke oven gas. The method comprises the following steps that: (1) the feed gas of coke oven gas is compressed and cooled; (2) the cooled coke oven gas is divided into two parts: coke oven gas flow A and coke oven gas flow B, wherein the coke oven gas flow B is throttled by a J-T valve and then depressurized and cooled before entering the bottom of a gas stripping tower; and (3) the coke oven gas flow A is cooled and enters a gas-liquid separation tank; the liquid flow from the bottom of the gas-liquid separation tank enters the gas stripping tower; and the flow at the bottom of the gas stripping tower is throttled by the J-T valve to obtain the liquefied natural gas, wherein the cooling is performed in a heat exchanger. Through the method provided by the invention, the qualified liquefied natural gas product can be directly separated from the coke oven gas, the liquefied natural gas can be conveniently transported and utilized, and the added value of the coke oven gas is increased; moreover, the coke oven gas recovery technology has a simple flow and high automation degree; and the adopted equipment is reliable, and the economic benefits of a coke oven gas recovery device are increased.

Description

technical field [0001] The invention relates to a method for producing liquefied natural gas from coke oven gas. Background technique [0002] Every year, my country accumulatively produces 300 to 400 million tons of coke, and the coke output per ton is 420m 3 Coke oven gas calculation, coke oven gas output is 144.9 billion m 3 . Since the coking plants of most iron and steel enterprises in my country use blast furnace gas to heat the coke ovens, basically all the coke oven gas is used, while about half of the coke oven gas in independent coking plants is used for heating the coke oven itself, and the other half of the coke oven gas is used to heat the coke oven itself. Convey it outward or set up a special device for recovery. It is estimated that coking enterprises across the country transport at least 30 billion m3 of coke oven gas to the outside every year or need to set up special equipment to recover coke oven gas 3 , the traditional use of coke oven gas to produce ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C10L3/10
CPCF25J3/0219F25J2210/14F25J2205/04F25J2200/02F25J2200/70F25J2200/40F25J2210/06F25J2270/12F25J2270/18F25J2270/14F25J2270/66F25J2270/42F25J2215/04F25J3/0252F25J3/0233F25J3/0238F25J3/0257
Inventor 唐令力陈杰单彤文尹全森王秀林邰晓亮杨文刚浦晖常心洁陈海平
Owner CHINA NAT OFFSHORE OIL CORP
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