Membrane type water cooled low NOx gas combustion device

Abstract

The invention provides a membrane type water cooled low NOx gas combustion device. A cylindrical membrane type water cooled combustion head, a ring-shaped water chamber, a flow sharing device, an air-fuel mixing device, an ignition and fire detection integrated device, a fan, an air inlet silencer, a burner connection flange, a water inlet and outlet, and a gas inlet are included, the membrane type water cooled combustion head is fixedly connected with the ring-shaped water chamber, the air-fuel mixing device is fixed on the ring-shaped water chamber, and the fan is connected with the air-fuelmixing device and provided with the air inlet silencer. The membrane type water cooled low NOx gas combustion device can be installed horizontally, vertically or obliquely, is convenient to disassemble and replace, and can be suitable for existing gas boilers with any forms. According to the membrane type water cooled low NOx gas combustion device, the structure is simple, processing is easy, theflue-gas temperature can be effectively lowered, internal flue-gas recirculation is formed, the effective radiating area of a furnace is increased, and the combustion flame front temperature is lowered, so that production of NOx is lowered.

Description

technical field [0001] The invention belongs to gas low NO x In the field of combustion technology, it specifically relates to a membrane-type water-cooled low-NO x Gas burner. Background technique [0002] In recent years, with the country's emphasis on environmental protection issues, the NO x Emission requirements are becoming more and more stringent, and the emission standard has changed from the original requirement of 400mg / m 3 to 150mg / m 3 , to 80mg / m 3 , and even some cities and regions directly limit the standard to no more than 30mg / m 3 It only took 2-3 years to change the whole standard; moreover, the Ministry of Environmental Protection is also brewing and researching 5mg / m 3 emission indicators, which shows the country's urgent requirements for low nitrogen emissions from gas-fired boilers, which also makes low NO x Combustion technology has been widely used. [0003] At present, foreign countries have adopted a variety of new low NO x burner, its NO x...

AI Technical Summary

Problems solved by technology

Among these two technical routes, the first technical route has a wider range of applications and mature combustion stabilization technology, but it also has complex systems, high energy consumption, and 30mg / m 3 It is its emission limit, miniaturization and low cost performance.

The second technical route is also widely used, but it also has many shortcomings: ① Higher requirements for air cleanliness; ② The surface is easy to block ash and sinter, ③ High temperature is easy to temper; ④ High air excess coefficient is required to achieve low NO x , high energy consumption

The third technical route also has some applications, which solves the problems in the second technical route, but there are also some shortcomings: ①The integrated design of the burner combined with the boiler, there is no separate combustion device for sale in the market, and it is impossible to use the existing Gas boiler for low NO x Renovation; ②The combustion grate adopts vertical tubes + water-cooled pores, and the structure is complex; ③Uses a large flat structure, the flow field uniformity is poor, and it is easy to temper with small loads; ④The capacity of a single combustion head is limited, and large-scale design cannot be realized

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