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Oxygen-enriched combustion of high-sulfur coal and comprehensive flue gas treatment process

An oxygen-enriched combustion and comprehensive treatment technology, which is applied in the combustion, combustion method, combustion equipment and other directions of solid fuels, can solve the problem of comprehensive treatment and utilization of unfavorable high-sulfur coal combustion flue gas, and it is difficult to achieve clean and comprehensive utilization of high-sulfur coal. , the problem of high investment in flue gas desulfurization equipment, to achieve the effect of resource utilization, reducing coal consumption and improving productivity

Inactive Publication Date: 2011-11-30
成都华西工业气体有限公司
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Problems solved by technology

However, the above method has obvious disadvantages. First, in the combustion process of high-sulfur coal, the combustion-supporting gas used is air, which causes the flue gas to have a large flow rate, SO 2 Due to the low concentration, the subsequent desulfurization device load is too large, resulting in high investment in flue gas desulfurization device and poor desulfurization effect; secondly, the existing flue gas desulfurization technology mainly based on limestone-gypsum method, its Desulfurization by-products are usually low-value-added products such as gypsum, which are difficult to sell or landfill, which greatly reduces the economics of desulfurization and causes secondary pollution; at the same time, the existing flue gas treatment process cannot At the same time, the SO in the flue gas 2 with CO 2 The two pollutants are recycled, which is not conducive to the comprehensive treatment and utilization of high-sulfur coal combustion flue gas
[0004] Therefore, conventional combustion methods, desulfurization technologies, and flue gas treatment processes are difficult to achieve clean and comprehensive utilization of high-sulfur coal

Method used

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  • Oxygen-enriched combustion of high-sulfur coal and comprehensive flue gas treatment process

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Embodiment 1

[0020] The air is separated by a cryogenic air separation unit to produce O with a purity of 99.5% 2 , The O 2 CO recovered from part of the flue gas treatment stage 2 Mix to form O 2 The oxygen-enriched content is 22%. The oxygen-enriched gas is used as the combustion-supporting gas. The high-sulfur pulverized coal is oxy-fueled in the coal-fired boiler. The high-pressure steam generated after the boiler water is heated is used for power generation, and the high-sulfur coal is burned After the flue gas is cooled and dust removed, it enters the desulfurization system at 65°C. The desulfurization system uses organic amine or ionic liquid as the desulfurization solvent, and adopts the flue gas desulfurization technology of solvent circulation absorption method. The desulfurization solvent is used to remove SO in the flue gas. 2 Perform absorption removal. Absorb SO 2 The regenerating gas generated by the desulfurization solvent after heating and regeneration, its SO 2 The content i...

Embodiment 2

[0022] The air is separated by a cryogenic air separation unit to produce O with a purity of 99.5% 2 , The O 2 CO recovered from part of the flue gas treatment stage 2 Mix to form O 2 Oxygen-enriched content of 95%. The oxygen-enriched gas is used as the combustion-supporting gas. The high-sulfur pulverized coal is oxy-fueled in the coal-fired boiler. The high-pressure steam generated after the boiler water is heated is used for power generation. After the flue gas is cooled and dust removed, it enters the desulfurization system at 45°C. The desulfurization system uses organic amine or ionic liquid as the desulfurization solvent. The flue gas desulfurization technology using solvent circulation absorption method uses desulfurization solvent to remove SO in the flue gas. 2 Perform absorption removal. Absorb SO 2 The regenerating gas generated by the desulfurization solvent after heating and regeneration, its SO 2 The content is 99.5%, directly sent to the subsequent SO 2 Productio...

Embodiment 3

[0024] The air is separated by a pressure swing adsorption device to produce O with a purity of 93% 2 , The O 2 CO recovered from part of the flue gas treatment stage 2 Mix to form O 2 Oxygen-enriched content of 63%. The oxygen-enriched gas is used as the combustion-supporting gas. The high-sulfur pulverized coal is oxy-enriched in the coal-fired boiler. The high-pressure steam generated after the boiler water is heated is used for power generation, and the high-sulfur coal is burned After the flue gas is cooled and dust removed, it enters the desulfurization system at 57°C. The desulfurization system uses organic amine or ionic liquid as the desulfurization solvent, and adopts the flue gas desulfurization technology of solvent circulation absorption method. The desulfurization solvent is used to remove the SO in the flue gas. 2 Perform absorption removal. Absorb SO 2 The regenerating gas generated by the desulfurization solvent after heating and regeneration, its SO 2 The conten...

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Abstract

The invention relates to the oxygen-enriched combustion of high-sulfur coal and the comprehensive treatment process of flue gas. Through the integration and application of various technologies such as oxygen-enriched combustion technology and solvent circulation absorption method flue gas desulfurization technology, a high thermal efficiency, low energy consumption, and low Pollution, good economic characteristics, and taking into account flue gas desulfurization, decarbonization, dust removal treatment and SO2 pollutants, CO2 pollutants recovery and utilization of high-sulfur coal oxygen-enriched combustion and flue gas comprehensive treatment process, so as to provide a clean environment for high-sulfur coal A feasible way has been found. The technical content of the invention can be widely used in the combustion and utilization of high-sulfur coal by coal-fired furnaces in thermal power, chemical industry, building materials and other industries and the comprehensive treatment of SO2 and CO2 in the flue gas.

Description

technical field [0001] The invention relates to an oxygen-enriched combustion and flue gas comprehensive treatment process when high-sulfur coal is used as coal-fired coal, belongs to the technical field of resources and environment, and is mainly applicable to coal-fired furnaces for high-sulfur coal in industries such as thermal power, chemical industry, and building materials. Combustion utilization and its flue gas desulfurization, decarbonization, dust removal treatment and SO 2 Pollutants, CO 2 Recycling of pollutants. Background technique [0002] Generally speaking, coal with a sulfur content greater than 3% is called high-sulfur coal. At present, nearly 8% of my country's proven coal resources are high-sulfur coal. According to the current national coal resource forecast total and proven coal Calculation of reserves, the predicted total and proven reserves of high-sulfur coal are about 426 billion tons and 62 billion tons respectively, which is quite rich in resour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23B90/00B01D53/14C01B31/20F23L7/00C01B32/50
CPCY02E20/34Y02P20/10
Inventor 李东林郎治
Owner 成都华西工业气体有限公司
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