Temperature-controlled, low-nitrogen, and energy-saving combustion device for flue gas reflux and staged premixed combustion

Abstract

The invention relates to a temperature control low-nitrogen and energy-saving combustion device capable of achieving flue gas recirculation and staged premixed combustion. The combustion device can effectively complete airflow straight flow or rotational flow staged premixing and combustion, the combustion temperature is lowered, the content of nitrogen oxide can be effectively controlled, gas consumption is reduced, and energy saving is realized. A mixed combustion space is arranged in the opening end of a combustion chamber. The closed end of the mixed combustion space is connected with a staged combustor. A recirculation flue gas inlet pipe is arranged on the outer circle of a recirculation flue gas distribution loop in the closed end of the combustion chamber. Recirculation flue gas bleeding pipes are arranged between the recirculation flue gas distribution loop and the mixed combustion space. Supporting spinning disks are arranged in each loop of the staged combustor. An airflow adjusting blunt body is arranged at the opening of the inner end of the staged combustor. Primary and secondary air inlet pipes are arranged on the side wall of the staged combustor. An aided mixing flow equalizing plate is arranged in a primary air pre-mixing chamber in the opening of the inner end of the staged combustor. The temperature control low-nitrogen and energy-saving combustion device is more obvious in energy-saving effect, the combustion temperature and nitrogen oxide production are effectively controlled, and pollution to the atmospheric environment is reduced.

Description

technical field [0001] The present invention relates to a combustion device for heat utilization equipment of industrial furnaces and kilns, which is especially suitable for industrial furnaces and kilns such as boilers burning gas fuel, heating furnaces, hot blast furnaces, metal smelting furnaces, rotary kilns, tunnel kilns, and shuttle kilns. A temperature-controlled, low-nitrogen, and energy-saving combustion device for flue gas recirculation and staged premixed combustion. Background technique [0002] At present, in consideration of energy saving and environmental protection, industrial furnaces require combustion devices to achieve efficient and controllable complete combustion under different fuels and different gases, and at the same time, it is also required to effectively reduce the formation of nitrogen oxides (NOx) during the combustion process. amount, in order to achieve the ultimate goal of high efficiency, energy saving and environmental protection. For thi...

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Problems solved by technology

There are many low-grade energy sources with exhaust gas temperature below 200°C. They are reluctant to give up and use large investment to apply them, but they turn a blind eye to the temperature difference of 200°C and above in the high temperature section, so that the energy cannot be used rationally. So how to achieve the combustion temperature? It is an urgent problem to be solved at present to make full use of the heat at the high-temperature end while reasonably controlling it, so as to save fuel, save costs and suppress the formation of nitrogen oxides.

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