Sintering flue gas purification system and method achieving energy conservation and emission reduction

Abstract

The invention belongs to the technical field of sintering flue gas purification technologies, and provides a sintering flue gas purification system and method achieving energy conservation and emission reduction in order to solve the problems existing in the prior sintering flue gas purification technology. The system comprises a sintering machine, a flue gas distributor, a sintering machine bottom bellows, a sintering machine large gas duct, an electric dust remover, a sintering main exhaust fan, a first fan, a second fan, an adsorption tower, a chimney, a material conveyor and a regeneration tower. Besides, a heat exchanger is arranged in the sintering machine large gas duct of the system, or the system is further provided with a dust remover, and all the devices are connected sequentially through pipelines. The method includes the steps of utilization of flue gas heat of the sintering machine, adsorption of the adsorption tower and regeneration of active coke. According to the system and method, on the basis of effectively controlling the temperature of flue gas, fully utilizing heat-contained exhaust gas, reducing the scale of an active coke flue gas purification device, avoiding secondary pollution and realizing recycling of resources, the investment and operation expenses are lowered.

Description

technical field [0001] The invention belongs to the technical field of sintering flue gas purification, and in particular relates to an energy-saving and emission-reducing sintering flue gas purification system and method. Background technique [0002] A large amount of flue gas is produced during the sintering production process, and substances such as SOx, NOx, particulate matter, heavy metals and dioxins contained in the flue gas pollute the environment. With the increasingly stringent national environmental protection requirements, the technology of comprehensive treatment of multiple pollutants is an inevitable trend in the development of flue gas treatment. The activated coke flue gas purification process can realize low-temperature denitrification on the basis of desulfurization, and has a certain removal effect on dust, heavy metals, dioxins and other pollutants. In addition, the by-product of desulfurization is high-quality sulfuric acid, which can recover sulfur r...

AI Technical Summary

Problems solved by technology

However, this process method still has the phenomenon of exhaust gas containing heat, and the energy cannot be fully recovered.

[0007] (3) Large investment in activated coke flue gas purification process

[0009] (4) Secondary pollution in activated coke flue gas purification process

[0010] There are secondary pollution problems in the activated coke flue gas purification process: such as high SO produced during the regeneration of activated coke 2 When the concentration gas is used to produce concentrated sulfuric acid, there will be waste gas, which contains SOx, sulfuric acid mist, etc.; the activated coke will be damaged during the cycle, and the damaged activated coke will be screened by a vibrating screen to produce solid waste (coke pink)

[0011] In summary, the existing activated coke flue gas purification process has disadvantages such as unreasonable flue gas temperature control, hot exhaust gas discharge, energy waste, large initial investment, and secondary pollution. It is necessary to develop active coke suitable for sintering machine production The flue gas purification process and method, on the basis of effectively controlling the flue gas temperature, making full use of the hot waste gas, reducing the scale of the activated coke flue gas purification device and avoiding secondary pollution, can reduce investment and operating costs

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