CN1492026A - Upword and down word type coal gas producing process using rich oxygen gasifying agent - Google Patents

Upword and down word type coal gas producing process using rich oxygen gasifying agent Download PDF

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Publication number
CN1492026A
CN1492026A CNA021474079A CN02147407A CN1492026A CN 1492026 A CN1492026 A CN 1492026A CN A021474079 A CNA021474079 A CN A021474079A CN 02147407 A CN02147407 A CN 02147407A CN 1492026 A CN1492026 A CN 1492026A
Authority
CN
China
Prior art keywords
gas
oxygen
coal gas
less
gasifying agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA021474079A
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Chinese (zh)
Inventor
张凤葵
巫发龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chuxiong Wuhan Bridge Construction Engineering Co Ltd
SANYUAN INDUSTRY AUTOMATION EQUIPMENT Co Ltd ANHUI PROV
Original Assignee
Chuxiong Wuhan Bridge Construction Engineering Co Ltd
SANYUAN INDUSTRY AUTOMATION EQUIPMENT Co Ltd ANHUI PROV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chuxiong Wuhan Bridge Construction Engineering Co Ltd, SANYUAN INDUSTRY AUTOMATION EQUIPMENT Co Ltd ANHUI PROV filed Critical Chuxiong Wuhan Bridge Construction Engineering Co Ltd
Priority to CNA021474079A priority Critical patent/CN1492026A/en
Publication of CN1492026A publication Critical patent/CN1492026A/en
Pending legal-status Critical Current

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/16Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
    • Y02E20/18Integrated gasification combined cycle [IGCC], e.g. combined with carbon capture and storage [CCS]

Abstract

The gas producing process includes alternate upward sage and downward stage, and during the alternate process rich oxygen gasifying agent is introduced into the gas creating furnace. Compared with available alternate upward and downward type coal gas producing process, the process of the present invention has shortened blowing time, prolonged gas producing time, less or no blowdown, increased single-batch gas yield, less heat loss, less exhausted powder material and thus less environmental pollution. Compared with rich oxygen complete-upward process, the process of the present invention has less heat loss and less gas entrainment.

Description

Up-down type coal gas production process adopting oxygen-enriched gasification agent
Technical Field
The invention relates to acoal gas production process.
Background
In the prior art, the technological processes for producing coal gas include an uplink and downlink type natural air gas making process and a continuous uplink gas making process. The main chemical equation adopted by the process flow for producing the coal gas is as follows:
(1)
(2)
(3)
(4)
(1) the oxygen in the formula (2) is derived from natural air (hereinafter referred to as air), but the nitrogen in the air accounts for 79%, so that the nitrogen content in the coal gas is inevitably high when the air is directly input into the gas making furnace to react with the coal. In the process of preparing gas by adopting the uplink and downlink air and steam, the excessive nitrogen content in the coal gas is not allowed in many occasions, and the gas quality is improved by inevitably adopting a method of emptying part of the coal gas in the operation process, so that not only is sensible heat and latent heat wasted, but also the gas evolution of a single furnace is reduced, and the environment is seriously polluted; the advantage of utilizing the up-down going formula technology to make coal gas is that the heat can concentrate in the charcoal layer better, and the average temperature of upper and lower export gas is about 300 ℃ generally, and the sensible heat that export gas brought out is less. In thecontinuous upward gas making process, some enterprises adopt oxygen-enriched air (hereinafter referred to as oxygen-enriched air) gasification agents and steam to produce coal gas, the production process has the defects that heat cannot be well concentrated in a carbon layer, the temperature of a coal gas outlet generally reaches above 650 ℃, the sensible heat loss is large, and a large amount of dust substances are mixed in the coal gas; the production process has the advantages of no need of emptying and less pollution to atmosphere.
Disclosure of Invention
The invention aims to solve the technical problem of designing an up-down type coal gas production process adopting an oxygen-enriched gasifying agent so as to solve the practical problems of large sensible heat loss, low gas evolution and much dust in the existing process.
The essential technical features of the invention to solve the technical problems are as follows: the coal gas production process comprises an ascending stage and a descending stage, and in the process of alternately circulating the ascending stage and the descending stage, an air gasification agent entering a gas making furnace is an oxygen-enriched gasification agent.
Compared with the prior upward and downward gas making process adopting the air gasifying agent, the invention has the advantages that the oxygen content is increased, the blowing stage (part of the upward large stage) can be shortened or cancelled, the gas making time is prolonged, and the gas forming amount of a single furnace can be increased by 4-30 percent; due to the reduction of the amount of the vent gas, the sensible heat loss will be reduced at the same outlet temperature; due to the reduction of the blowing air volume, the pulverized coal carried out by the outlet air is reduced by 12-80%, andthe outlet temperature of the upper air passage is reduced; because part of the nitrogen air is separated before entering the furnace, the emptying of the atmosphere is reduced or eliminated, which is of great significance to environmental protection.
Compared with the existing oxygen-enriched all-upward gas making process, the gas flows in the carbon layer in the gas producer in an up-and-down direction in an alternating and circulating way, so that the heat can be concentrated in the carbon layer and is less taken out by the gas, the outlet temperature can be reduced by 300-400 ℃, and for a gas making furnace with the diameter of phi 2400mm, the sensible heat loss can be reduced by about 2.6 tons of standard coal every day; due to the reduction of sensible heat loss, the chemical reaction amount for increasing the furnace temperature is reduced, and the chemical reaction amount for manufacturing effective gas components is increased, so that the gas forming amount of a single furnace is increased; because the upper temperature of the carbon layer is low, the coal pulverization by heating is greatly reduced, and the entrainment of the outlet gas is also greatly reduced.
The invention has important economic and social benefits for reforming tens of thousands of intermittent gas generators in China.
Drawings
FIG. 1 is a schematic view of an up-down type gas producer using oxygen-rich gasifying agent.
In the figure: 1. a gas making furnace; 2. an upper airway; 3. and a lower air passage.
Detailed Description
Referring to fig. 1, the up-down type coal gas production process using oxygen-rich gasifying agent comprises two major stages of up-down and up-down alternately, the gasifying agent used in the coal gas production process is oxygen-rich gasifying agent (the oxygen content is larger than that in the air) and steam, the oxygen-rich gasifying agent entering the furnace body of the gas-making furnace 1 and carbon react chemically in the process of up-down alternate circulation, and the process is mainly used for increasing the furnace temperature. The gasification agent in the ascending large stage is oxygen-enriched gasification agent or steam, or oxygen-enriched gasification agent plus steam; enters the gas making furnace 1 from the lower gas passage 3, and the generated gas is output from the upper gas passage 2. The gasification agent of the descending large stage is steam or steam plus oxygen-enriched gasification agent; the gas enters the gas making furnace 1 from the upper gas flue 2, and the generated gas is output from the lower gas flue 3.
The two major ascending and descending stages can be divided into several small stages according to production conditions and requirements, for example, when raw material gas for producing synthetic ammonia is used, the major ascending stage can be divided into four small stages, i.e. secondary upblowing (using steam gasifying agent), blowing (using oxygen-enriched gasifying agent), upblowing (using steam gasifying agent or steam and oxygen-enriched gasifying agent). According to different purposes and investment scales of the coal gas, the oxygen content of the oxygen-enriched gasifying agent can be properly adjusted, for example, the oxygen content of the oxygen-enriched gasifying agent for producing pure water coal gas reaches more than 99 percent. If the oxygen-enriched gasifying agent is used as raw material gas for producing synthetic ammonia and no blowing gas is exhausted, the oxygen content of the oxygen-enriched gasifying agent must exceed 33.85 percent. The oxygen content index of the oxygen-enriched gasification agent required to be achieved can be realized by directly adjusting the nitrogen separation amount of the air separation device, or by fixing the nitrogen separation amount of the air separation device and adding a proper amount of natural air, or by combining the former two modes.

Claims (3)

1. The up-down type coal gas production process adopting the oxygen-enriched gasification agent comprises an up-down stage and a down-down stage which are alternately carried out, and is characterized in that the air gasification agent entering the furnace body of the gas making furnace (1) is the oxygen-enriched gasification agent in the alternate circulation process;
2. the upward and downward coal gas production process using oxygen-rich gasification agent as claimed in claim 1, wherein the oxygen-rich gasification agent enters the furnace body from the lower gas flue (3);
3. the upward and downward coal gas production process using oxygen-rich gasification agent as claimed in claim 2, wherein the oxygen-rich gasification agent enters the furnace body from the upper gas duct (2).
CNA021474079A 2002-10-23 2002-10-23 Upword and down word type coal gas producing process using rich oxygen gasifying agent Pending CN1492026A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA021474079A CN1492026A (en) 2002-10-23 2002-10-23 Upword and down word type coal gas producing process using rich oxygen gasifying agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA021474079A CN1492026A (en) 2002-10-23 2002-10-23 Upword and down word type coal gas producing process using rich oxygen gasifying agent

Publications (1)

Publication Number Publication Date
CN1492026A true CN1492026A (en) 2004-04-28

Family

ID=34232960

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA021474079A Pending CN1492026A (en) 2002-10-23 2002-10-23 Upword and down word type coal gas producing process using rich oxygen gasifying agent

Country Status (1)

Country Link
CN (1) CN1492026A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101392187B (en) * 2008-10-29 2012-01-11 江西昌昱实业有限公司 Bidirectional oxygen-enriched continuous gasification process for atmospheric fixed bed gas furnace

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101392187B (en) * 2008-10-29 2012-01-11 江西昌昱实业有限公司 Bidirectional oxygen-enriched continuous gasification process for atmospheric fixed bed gas furnace

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