Combination method using semi-coke tail gas for power generation to cogenerate liquefied natural gas

A technology for liquefied natural gas and blue carbon tail gas, which is applied in the fields of combustible gas purification, gaseous engine fuel, and combustible gas purification/transformation. The effect of cleaning

Inactive Publication Date: 2013-02-27
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can solve the problem of the limitation of self-generated electricity and the low price of on-grid electricity for

Method used

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  • Combination method using semi-coke tail gas for power generation to cogenerate liquefied natural gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The main composition (vol%) of the semi-coke tail gas in this embodiment is: H 2 : 28.2, CH 4 : 7.3, CO: 16.0, CO 2 : 10, C n h m : 0.5, N 2 : 37.9, O 2 : 0.1. Air volume 50000Nm 3 / h, temperature 40°C.

[0051] (1) Blast: Use a Roots blower or a centrifugal blower to pressurize the semi-coke tail gas to 0.05~0.08MPa(G).

[0052] (2) Pre-purification

[0053] A dry purification temperature swing adsorption method is used to remove macromolecular impurities such as tar, naphthalene, benzene and dust in the semi-coke tail gas, and a rough purified semi-coke tail gas is obtained.

[0054] (3) Compression: Use a reciprocating compressor or a centrifugal compressor to pressurize the pre-purified gas to ~5.5MPa (G).

[0055] (4) Power generation: Part of the pre-purified gas is extracted from the compressor and enters the gas-fired generator set. The pre-purified gas is preheated to 100°C~500°C and mixed with air according to the volume ratio of 1:2~4 and passed in...

Embodiment 2

[0070] The main composition (vol%) of the semi-coke tail gas in this embodiment is: H 2 : 28.2, CH 4 : 7.3, CO: 16.0, CO 2 : 10, C n h m : 0.5, N 2 : 37.9, O 2 : 0.1. Air volume 50000Nm 3 / h, temperature 40°C.

[0071] (1) Blast: Use a Roots blower or a centrifugal blower to pressurize the semi-coke tail gas to 0.05~0.08MPa(G).

[0072] (2) Pre-purification

[0073] A dry purification temperature swing adsorption method is used to remove macromolecular impurities such as tar, naphthalene, benzene and dust in the semi-coke tail gas, and a rough purified semi-coke tail gas is obtained.

[0074] (3) Compression: Use a reciprocating compressor or a centrifugal compressor to pressurize the pre-purified gas to 0.5~2.0MPa (G).

[0075] (4) Power generation: Part of the pre-purified gas is extracted from the compressor and enters the gas-fired generator set. The pre-purified gas is preheated to 100°C~500°C and mixed with air according to the volume ratio of 1:2~4 and passed...

Embodiment 3

[0090] The main composition (vol%) of the semi-coke tail gas in this embodiment is: H 2 : 26.6, CH 4 : 7.7, CO: 13.2, CO 2 : 11.4, C n h m : 0.6, N 2 : 40.1, O 2 : 0.4. Air volume 50000Nm 3 / h, temperature 40°C.

[0091] (1) Blast: Use a Roots blower or a centrifugal blower to pressurize the semi-coke tail gas to 0.05~0.08MPa(G).

[0092] (2) Pre-purification

[0093] A dry purification temperature swing adsorption method is used to remove macromolecular impurities such as tar, naphthalene, benzene and dust in the semi-coke tail gas, and a rough purified semi-coke tail gas is obtained.

[0094] (3) Compression: Use a reciprocating compressor or a centrifugal compressor to pressurize the pre-purified gas to ~5.5MPa (G).

[0095] (4) Power generation: Part of the pre-purified gas is extracted from the compressor and enters the gas-fired generator set. The pre-purified gas is preheated to 100~500°C and mixed with air according to the volume ratio of 1:2~4 and passed in...

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Abstract

The invention discloses a combination method using semi-coke tail gas for power generation to cogenerate liquefied natural gas. The semi-coke tail gas is pressurized by an air blower and enters a pretreatment process, and impurities of tar, naphthalene, hydrogen sulfide and the like in the semi-coke tail gas are removed; a small part of preliminary purified gas after compression enters a gas generator unit directly, and the generated power is used for liquefying natural gas in a subsequent work section; and a large part of the preliminary purified gas enters a liquefied natural gas work section and is subjected to tar and naphthalene refined removing, sulfur resistance conversion, deep purification, methanation, liquefied cryogenic separation and the like to manufacture the liquefied natural gas. According to the combination method using semi-coke tail gas for power generation to cogenerate liquefied natural gas, all chemical engineering units operate according to set rated operating conditions and need not purchase electricity externally, problems of self power generation limits and ultra-low on-grid electricity price are solved for enterprises, and the economy of semi-coke enterprises is enhanced. Simultaneously, industrial exhausted semi-coke tail gas is prepared into the clean energy of the liquefied natural gas which is shortage in China, and accordingly, efficient and clean usage of the semi-coke tail gas is achieved.

Description

technical field [0001] The invention relates to the fields of environmental treatment and energy production, in particular to a combined method for generating electricity and co-producing liquefied natural gas by utilizing semi-coke tail gas. Background technique [0002] Semi-coke, also known as semi-coke, is a solid substance with high fixed carbon content produced by using Jurassic non-caking coal and weakly caking coal as raw materials by medium and low temperature dry distillation process, because it produces blue flame when burning name. During the production of semi-coke, semi-coke tail gas and coal tar are produced as by-products. At present, about 700Nm of semi-coke is produced per ton of semi-coke 3 Exhaust gas, calorific value 1700-2000 kcal. In 2010, the national semi-coke production was about 10 million tons, that is, the by-product semi-coke tail gas was about 7 billion Nm 3 . During the 12th Five-Year Plan period, my country's semi-coke market is expected ...

Claims

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Application Information

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IPC IPC(8): C10L3/06C10L3/08C10K1/00C10K3/02C10K1/34F02B43/10F02B63/04
CPCY02T10/32Y02T10/12Y02T10/30
Inventor 杨宽辉李泽军张新波易竖棚
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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