Multi-injection-tube type fire sheet

Abstract

The invention discloses a multi-injection-tube type fire sheet. The multi-injection-tube type fire sheet comprises a fire sheet body, a burning part is arranged at the top of the fire sheet body, theburning part is provided with a fire hole, the fire sheet body is provided with a plurality of vertical injection tubes which are evenly distributed from left to right, and all the injection tubes arein bilateral symmetry with respect to the vertical center faces of the injection tubes. According to the multi-injection-tube type fire sheet, the injection tubes are evenly distributed and are in bilateral symmetry, thus obstruction of the injection tubes to airflow can be effectively lowered, the injection ability can be improved, the air-fuel ratio is increased advantageously, the flow equalization effect of the fire sheet can be effectively improved, the uniformity degree of a flame is improved, full burning is ensured, and the emissions of nitrogen oxide and carbon monoxide are decreased.

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 aligned with the fire pieces are provided with gas flow passages on the fire pieces. The gas flow passages usually include injection pipes and gas chambers located above the injection pipes. The gas nozzles inject gas into the gas flow passages of the fire pieces. Drive the surrounding air into the gas channel to mix with the gas, and then the mixed gas is discharged from the fire hole of the fire piece to burn. [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,...

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] refer to figure 1 , the gas flow channel 11 of the existing fire piece is limited by the space occupied by the installation hole 20 for installing the water-cooled pipe, which is usually "L" shaped and irregular in shape, and the number of ejector pipes is small, which will cause It hinders the flow of air in the injection tube, which in turn affects the injection capability. It is difficult to improve the air-fuel ratio, and it is also difficult to ensure the uniformity of the gas-air mixture at the fire hole 121, resulting in uneven flames and insufficient local gas combustion. , it is difficult to reduce the emissions of nitrogen oxides and carbon monoxide

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