Fuel gas boiler smoke recycling humidification low-nitrogen system
A flue gas recirculation, gas boiler technology, applied in the field of gas boilers, can solve problems such as affecting the normal operation of the boiler, unstable flame combustion, etc., and achieve good low nitrogen effect, simple structure, and good low nitrogen effect.
Pending Publication Date: 2018-10-02
ZHENGZHOU UNIV
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Problems solved by technology
Single low-nitrogen combustion technologies such as air (gas) classification, flue gas recirculation, and dense-lean combustion can no longer meet the requirements of the current low-nitrogen emission policy
Flue gas recirculation technology can effectively reduce the formation of nitrogen oxides, but as the amount of circulating flue gas increases, the oxygen concentration in the air is continuously diluted, which is likely to cause instability of flame combustion and affect the normal operation of the boiler
Method used
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Embodiment Construction
[0010] The present invention will be further described below in conjunction with the accompanying drawings.
[0011] According to the gas boiler model, an air humidification preheater of corresponding specifications is installed above the boiler flue gas outlet. The air humidification preheater is a gas-gas heat exchange tube-fin structure, and is installed at the air inlet of the shell side according to the size of the air humidification. One or more water atomizers, the water inlet pipe of the water atomizer is connected to the water inlet pipe of the gas boiler, and the water source is provided by it, the shell side inlet and outlet of the air humidification preheater are connected to the air pipe, and the tube side inlet and outlet are connected to the boiler Exhaust duct.
[0012] Flow meters and regulating valves are installed in the combustion-supporting air pipeline and circulating flue gas pipeline to monitor and adjust the volume of combustion-supporting air and circ...
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The invention discloses a fuel gas boiler smoke recycling humidification low-nitrogen system. The fuel gas boiler smoke recycling humidification low-nitrogen system mainly comprises an air humidification preheater, a water boosting pump, an exhaust fan, an air pipeline, a circulation smoke pipeline and a mixed gas pipeline, and is characterized in that the air humidification preheater is a finnedtube-type gas-gas heat exchanger; a water atomizer and multiple finned tubes are arranged in the shell of the air humidification preheater; the water atomizer is located at the shell pass air inlet ofthe air humidification preheater; the water inlet pipe of the water atomizer is connected to a fuel gas boiler water inlet pipe; the water boosting pump is arranged on a connection pipeline; the circulation smoke pipeline is connected onto a smoke exhaust pipe of the air humidification preheater and is connected with the air pipeline of the shell pass outlet of the air humidification preheater, and the circulation smoke pipeline and the air pipeline are combined into the mixed gas pipeline; and the exhaust fan is arranged on the mixed gas pipeline. During operation, air is humidified and heated by the air humidification preheater, and then enters a combustor with circulation smoke through the mixed gas pipeline and participates in combustion. The smoke recycling humidification low-nitrogen system is simple, convenient and feasible, and is good in low-nitrogen effect.
Description
technical field [0001] The invention relates to the technical field of gas boilers, in particular to a gas boiler flue gas recirculation humidification low nitrogen system. Background technique [0002] Gas-fired boilers mainly use natural gas as fuel and are widely used in industrial production and residential heating. As my country's environmental protection requirements are getting higher and higher, the requirements for the emission limits of nitrogen oxides from gas-fired boilers are also getting higher and higher. At present, Beijing, Shanghai, Zhengzhou and other cities require that the nitrogen oxide emission of new gas-fired boilers be lower than 30mg / Nm 3 . Single low-nitrogen combustion technologies such as air (gas) classification, flue gas recirculation, and dense-lean combustion can no longer meet the requirements of the current low-nitrogen emission policy. Flue gas recirculation technology can effectively reduce the formation of nitrogen oxides, but as the...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F23C9/00F23C7/00F23L7/00F23L15/04
CPCF23C7/00F23C7/008F23C9/00F23L7/005F23L15/045F23C2202/30Y02E20/34
Inventor 吴金星李雪赵克林杨禹坤
Owner ZHENGZHOU UNIV