Gas molecular collision diffusion premixed low-nitrogen combustion device and its combustion head

Abstract

The invention discloses a gas molecule collision diffusion premixed low-nitrogen combustion device and a combustion head thereof. The combustion head includes a combustion head body, and the combustion head body is provided with a central pipe, several first annular pipes, several second annular pipes, and an annular flame forming area; the first annular layer and the second annular layer are arranged in sequence Between the central pipe and the annular flame forming area; the present invention arranges the first annular pipe and the second annular pipe on the periphery of the central pipe, so that the combustion head body can form multiple mutually independent In the combustion process, if one of the premixing areas fails to work normally due to failure, it will not affect the normal operation of other areas. The gas and air in the invention can be fully premixed, so there is almost no local high temperature point during combustion, and the generation of nitrogen oxides can be effectively and significantly reduced.

Description

technical field [0001] The invention relates to a combustion device, in particular to a low-nitrogen combustion device which achieves full premixing of gas and air through collision and diffusion. Background technique [0002] According to the statistics of China Energy News, as of the end of 2017, there are about 400,000 industrial boilers in use in my country, and the number of small civil boilers is even larger (no statistical data yet). With the country's strict requirements on environmental protection, environmental protection departments in various places have successively issued documents requiring that old boilers need to be retrofitted to meet emission standards. By 2021, it is expected that the number of clean energy used will reach more than 70%, and the total amount is huge. A large part of the boiler renovation is to replace the low-nitrogen burner to meet the low-nitrogen emission requirements, and the old boilers are directly replaced to meet the emission requ...

AI Technical Summary

Problems solved by technology

[0013] 1. The requirements for gas pressure are high, some reformed areas cannot boost the pressure, and the reformation is difficult

[0014] 2. When the boiler is rebuilt, the size of the furnace is required to be large, and the old boiler cannot enlarge the furnace at all.

Many boilers that have just been used for two or three years are forced to be replaced, which increases the burden on enterprises

[0015] 3. Newly built boilers require larger furnaces, which increases boiler manufacturing costs

[0016] 4. To achieve NOX≤30mg / m3 requires the assistance of FGR (flue gas reflux), which will produce acidic condensed water into the furnace, reduce the thermal efficiency of the boiler, and corrode the burner and furnace, reducing the service life of the boiler

[0018] 6. The condensed water produced by FGR in extremely cold regions will quickly condense into ice cubes, which will block the inlet of the fan and cause the shutdown of the furnace

Or some ice cubes are sucked into the fan, damaging the fan impeller, resulting in unstable performance of the equipment, increasing the maintenance rate and reducing the service life of the equipment

[0019] 7. Insufficient and uneven mixing of air and gas, incomplete combustion and high oxygen content

[0023] 1. This technology has an extra stage of partial gas premixing device in advance, which needs to increase the size of the burner body (bulky), which also increases the manufacturing cost

[0024] 2. Due to the pre-mixing device for some gases in advance, tempering occurs when the gas pressure is unstable

[0025] 3. When the boiler is rebuilt, the size of the furnace is required to be large, and the old boiler cannot enlarge the furnace at all.

Many boilers that have just been used for two or three years are forced to be replaced, which increases the burden on enterprises

[0026] 4. Newly built boilers require larger furnaces, which increases boiler manufacturing costs

[0027] 5. To achieve NOX≤30mg / m3 requires the assistance of FGR (flue gas reflux), which will produce acidic condensed water into the furnace, reduce the thermal efficiency of the boiler, and corrode the burner and furnace, reducing the service life of the boiler;

[0029] 7. The condensed water produced by FGR in extremely cold regions will quickly condense into ice cubes, which will block the fan inlet and cause the shutdown of the furnace

Or some ice cubes are sucked into the fan, damaging the fan impeller, resulting in unstable performance of the equipment, increasing the maintenance rate and reducing the service life of the equipment

[0030] Based on the above two combustion methods, there are still many defects, mainly to achieve the purpose of low nitrogen at the expense of energy consumption

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