Process method for preparing LNG from coke oven tail gas

A process method and technology for coke oven tail gas, which are applied in the petroleum industry, gas fuel, and combustible gas purification, etc., can solve the problems of lack of total sulfur removal measures, affecting the quality of finished LNG, and lack of utilization, etc., so as to facilitate application and emergency replenishment. and storage, ease of procurement and supply, the effect of ease of storage

Inactive Publication Date: 2010-08-18
CHENGDU HESHITONG CYROGENIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned process methods have different characteristics, but they all lack CO and CO in the coke oven gas. 2 The utilization of components also has the problem of lack of total sulfur removal measures in coke oven gas, which affects the quality of finished LNG and limits its application (such as automobile fuel)

Method used

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  • Process method for preparing LNG from coke oven tail gas
  • Process method for preparing LNG from coke oven tail gas
  • Process method for preparing LNG from coke oven tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] Production scale

[0049] Processing coke oven coal: 30000m 3 / h

[0050] 720,000m 3 / d

[0051] Product: LNG: 11000Nm 3 / h

[0052] By-product: H 2 :5000Nm 3 / h (Preliminary estimate based on current composition)

[0053] Annual operating hours: 8000h

[0054] Product solutions:

[0055] LNG: 11000Nm 3 / h 7.8712t / h(-135℃,0.6MPa·G)

[0056] 62769.6t / a

[0057] H 2 :5000m 3 / h

[0058] 165,600m 3 / d

[0059] Product technical quality index

[0060] LNG product specifications

[0061]

[0062] Calorific value: index>31.4MJ / Nm 3 , This product exceeds 34MJ / N m 3 H 2 Technical index (after refining)

[0063] composition

H2

CO+CO 2

N2

CH 4

V％

≥99.9%

≤20ppm

≤0.04％

≤5ppm

O2

H 2 O

NH 3

C 2 H 2

≤5ppm

≤2mg / m 3

≤5ppm

≤10ppm

Total S

≤1ppm

pressure

≥1.4

MPa(G)

[0064] composition

H2

CO+CO 2

N2

CH 4

temperature

≤40℃

[0065] Note: This technological scheme does not include hydrogen refining for the time being. If refining is required, a...

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Abstract

The invention relates to a process method for preparing LNG from coke oven tail gas. The method comprises the following steps: storing coke oven gas subject to wet desulphurization pretreatment from a coke-oven plant in a gas holder to be used as the feed gas, enabling the feed gas to be subject to pressurization, normal-temperature oxidation and pre-desulphurization, two-stage catalytic hydrogenation conversion and dry desulphurization, converting CO and CO2 in the feed gas into CH4 by three-stage methanation reaction, removing residual moisture and CO2 by the adsorption of a molecular sieve, and carrying out two-stage throttling flash distillation and copious cooling liquefaction to obtain the LNG product. The invention has the characteristics of low total sulfur content, high liquefied gas quality and high calorific value.

Description

Technical field [0001] The invention relates to a process for preparing LNG using coke oven gas as a raw material gas, in particular to a process for preparing LNG by pressurized deoiling, crude desulfurization, fine desulfurization, catalytic hydrogenation, methanation reaction, hydrogen separation, and finally cryogenic liquefaction. method. Background technique [0002] The main component of liquefied natural gas (LNG) is methane, which has high heating value (>31.4MJ / Nm) 3 ) And convenient storage and transportation. It can be used for city gas supply, peak shaving and backup gas source, gas vehicles, bottled gas, basic chemical raw materials, industrial gas, etc. [0003] Coke oven gas is one of the main by-products in the process of coal retorting into coke in a coking plant. The main components are hydrogen, methane, CO, CO 2 Wait. Existing coke oven gas purification treatment generally uses water to wash oil, wash naphthalene, desulfurization, debenzene, etc. The purifi...

Claims

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Application Information

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IPC IPC(8): C10L3/08C10L3/10C10K1/32C10K1/20
CPCY02P20/129
Inventor 周琳
Owner CHENGDU HESHITONG CYROGENIC TECH
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