Desulphurization-denitration cooperative treatment method for flue gas of hot-blast stoves

Abstract

The invention relates to a desulphurization-denitration cooperative treatment method for flue gas from hot-blast stoves. The method comprises the following steps: controlling all the heat-accumulatingtype hot-blast stoves to be in a working state of alternate combustion heat accumulation and hot air conveying, allowing high-temperature flue gas produced in a combustion stage to exchange heat withgas used as a fuel, and conveying the preheated gas to the hot-blast stoves for combustion; allowing the cooled flue gas to pass through an ozone oxidation denitration apparatus for denitration; subjecting the flue gas to desulphurization with a wet-process desulphurization apparatus; and after desulphurization, discharging purified gas. The cooperative treatment method provided by the inventioncarries out flue gas purification, hot-air conveying and waste-heat recovery synchronously, efficiently removes sulfur dioxide and nitrogen oxide in the flue gas, purifies the flue gas, meets emissionrequirements prescribed in new standards or ultra-low emission requirements, recycles the heat energy of the flue gas, lowers operation cost and saves energy and resources.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for synergistic treatment of desulfurization and denitrification of waste gas from hot blast stoves. Background technique [0002] The hot blast stove is a thermal equipment that integrates combustion and heat transfer processes to provide hot air flow for the production process. Iron-making blast furnaces require high air temperature, and the use of hot blast stoves can provide high-temperature hot air above 1000°C for the blast furnace. At present, the iron-making blast furnace adopts intermittently working regenerative hot blast stoves. In order to continuously provide high-temperature hot blast, each blast furnace is generally equipped with 3 to 4 hot blast stoves. The fuel of the blast furnace hot blast stove is blast furnace gas or coke oven gas, which will inevitably produce SO in the process of combustion and heating. 2 and NO x Pollutants suc...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a co-treatment method for desulfurization and denitrification of hot blast stove exhaust gas, which solves the technical problem that there is no related equipment or process in the prior art to purify the exhaust gas of the hot blast stove, resulting in air pollution, and realizes exhaust gas purification, hot air transportation and Waste heat recovery is carried out simultaneously, efficiently removes sulfur dioxide and nitrogen oxides in the exhaust gas, purifies the exhaust gas and discharges it up to the standard, enables the recovery and utilization of exhaust gas heat energy, saves energy and reduces consumption, and reduces the technical effect of operating costs

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