Flow-equalization-type fire sheet

Abstract

The invention discloses a flow-equalization-type fire sheet. The flow-equalization-type fire sheet comprises a fire sheet body, fuel gas channels are formed in the fire sheet body, a fire hole is formed in the top of the fire sheet body, transverse flow-equalization plates which are located on the lower part of the fire hole are arranged in the fuel gas channels, long-strip-shaped first flow-disturbing holes parallel to the front-rear direction are formed in the middles of the flow-equalization plates, and a plurality of second flow-disturbing holes are formed in the left parts and the right parts of the flow-equalization plates correspondingly and distributed in the front-rear direction. According to the flow-equalization-type fire sheet, the flow-equalization plates can achieve the effects of flow turbulence, flow equalization and flow limiting, mixed gas in the fuel gas channels can generate cross interference when passing through the first flow-disturbing holes and the second flow-disturbing holes in the two sides, fuel gas and air can be mixed more fully through the stirring effect, thus the fire sheet is burned more fully, the burn-out time is short, the generating time of nitrogen oxide is also shortened while the carbon monoxide is effectively reduced, and thus emission of the nitrogen oxide is effectively reduced.

Description

technical field [0001] The present invention relates to a fire piece of a fire row burner. Background technique [0002] Fire row burners are usually used in heating, hot water, and steam supply devices such as modular furnaces, wall-hung furnaces, water heaters, and steam generators. They usually include a base and several fire pieces arranged side by side on the base. The gas nozzles are aligned with the gas nozzles, and the gas nozzles inject gas into the gas channel of the fire piece. In this process, using the principle of nozzle ejection, the surrounding air can be driven into the gas channel to mix with the gas, and then the mixed gas flows from the fire hole of the fire piece. Exhausted for combustion. [0003] In recent years, due to the increasingly severe environmental problems, Beijing officially implemented the most stringent boiler nitrogen oxide emission standards on April 1, 2017, requiring that the nitrogen oxide emission of newly built boilers be based on ...

AI Technical Summary

Problems solved by technology

The traditional single-nozzle fire row burner is difficult to ensure the accurate mixing ratio of oxygen and gas, so it is difficult to control the emission of nitrogen oxides and carbon monoxide. At present, there is a high-precision electronic control system to control the gas and air according to the full premixing ratio. Mixed fully premixed burner, natural and sufficient combustion, less chemical incomplete combustion loss, high thermal efficiency, and nitrogen oxide emissions can be less than 30mg / m 3 , carbon monoxide 3 , the emissions fully meet the requirements

Although the fully premixed burner can fully meet the air pollution emission standards of newly-built boilers in terms of energy saving and environmental protection, in order to ensure the stability of the fully premixed combustion, it is necessary to control the precise ratio of gas and air at the same time, which is extremely difficult. highly nonlinear control

During the combustion process of the fully premixed burner, if the ratio of gas and air is not controlled correctly, two situations will occur: If the premixed air is insufficient and there is no secondary air supply, it will be anoxic combustion, and the carbon monoxide emissions will increase significantly , which is one of the reasons why most of the current fully premixed boilers have poor energy-saving effect in actual use: if the premixed air is too much, it is over-premixed, and it is easy to deflagrate when ignited

The flame stabilization problem of fully premixed combustion is another problem. It is difficult to stabilize the flame with the flame hole structure processed by mechanical methods. Almost all premixed burners in the world use high temperature resistant metal fiber mesh to wrap the surface of the fire hole. Flame stabilization, this method of microporous flame stabilization is very effective, but the cost is high and the service life is short. It is an expensive wearing part. In order to prevent the metal fiber mesh from clogging and affecting combustion, it is necessary to strictly filter the gas and air. processing, which not only increases the operating cost of the boiler, but also affects the stability of the air-fuel ratio

The head structure is relatively complex and bulky to prevent backfire, and there will be a lot of noise under high pressure and high load, which are the disadvantages of fully premixed burners

[0005] The mixed gas of the flakes of the existing fire row burner is usually directly discharged from the fire hole after passing through the gas channel, and because the gas velocity ejected from the nozzle is fast, the airflow velocity in the gas channel is also correspondingly fast, and the gas and air often It is difficult to carry out effective mixing, and it is also difficult to ensure the uniformity of the mixed gas discharge from each fire hole, which will easily lead to insufficient combustion of some gases and uneven flame heights, which will increase the emissions of carbon monoxide and nitrogen oxides

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