Low-nitrogen combustion device with free dispersion pre-mixing combustion layer and combustion head thereof

Abstract

The invention discloses a low-nitrogen combustion device with a free dispersion pre-mixing combustion layer and a combustion head thereof. The combustion head comprises a combustion head main body; the combustion head main body is provided with a center pipe, multiple first ring layer pipes, multiple second ring layer pipes and the free dispersion pre-mixing combustion layer; and first ring layersand second ring layers are arranged on the outer side of the center pipe in sequence. Through arrangement of the first ring layer pipes and the second ring layer pipes at the outer periphery of the center pipe, the combustion head main body can form multiple independent premixing areas at the outer periphery of the center pipe in the radial direction, so that the normal work of other areas cannotbe influenced when one premixing area cannot normally work due to faults in the combustion process. Said gas and air can be fully premixed through the free dispersion pre-mixing combustion layer, sothat no local high-temperature point exists during combustion, and the generation of a nitric oxide can be prominently reduced.

Description

Technical field [0001] The invention relates to a combustion device, in particular to a low-nitrogen combustion device that realizes full premixing of air and fuel gas through free diffusion. Background technique [0002] According to statistics from China Energy News, as of the end of 2017, there were about 400,000 industrial boilers in use in my country, and the number of small civilian boilers is even larger (no statistics are currently available). With the country’s strict environmental protection requirements, environmental protection departments in various regions have successively issued documents requiring that old boilers need to be reformed to meet emission standards. By 2021, it is expected that the amount of clean energy used will reach more than 70%, which is a huge amount. Most of the boiler transformation is to replace the low-nitrogen burner to meet the low-nitrogen emission requirements, and the old boilers are directly replaced with new ones to meet the emission...

AI Technical Summary

Problems solved by technology

[0013] 1. The requirements for gas pressure are high, and the pressure cannot be boosted in some renovation areas, making renovation difficult

[0014] 2. The size of the furnace is required to be larger when the boiler is renovated, 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. In extremely cold regions, the condensed water produced by FGR 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 part of the 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. The size of the furnace is required to be large when the boiler is renovated, 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, increasing boiler manufacturing costs

[0027] 5. To achieve NOX≤30mg / m3 requires the assistance of FGR (flue gas return), 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. In extremely cold regions, the condensed water produced by FGR 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

[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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