An energy-saving burner and steam generator for positive pressure combustion of premixed gas

Abstract

The invention discloses an energy-saving burner for premixed fuel gas to be burnt at a positive pressure and a steam generator. According to the burner, a burning surface of the burner is made from aludirome fabric; cooling devices are arranged in the circumferential direction along the edge of the burning surface; the fuel gas and air are completely mixed through a mixer and a premixing cavity, and are burnt at the positive pressure on the surface of the aludirome fabric. The problems that tempering is easily caused in positive-pressure burning, and ignition detonation is easily caused in premixed and enclosed burning are solved, and the burning process is safe and reliable. The burner is adopted in the steam generator; the mixed gas is rapidly burnt out in minimal sealed space formed between a burning part and an inner container of the steam generator, steam is generated fast, and waste heat produced during the steam generating process is effectively utilized; the sealed and premixed burning manner and the reasonable connection of all components enable the size of the steam generator is much less than that of the conventional steam generator; meanwhile, automatic drainage control effectively depresses and relieves the formation of water scale after the conventional steam generator is used for a long time.

Description

technical field [0001] The invention belongs to the industry field of burners and steam generators, and in particular relates to an energy-saving burner for positive pressure combustion of premixed gas and a steam generator including the burner. Background technique [0002] The combustion method of the burner is mainly divided into diffusion combustion and premixed combustion. [0003] The burners in the prior art mainly adopt the traditional fire row type diffusion combustion, and most of them are pressureless or negative pressure combustion. Before combustion, the gas and air are not completely premixed in proportion, but are burned while mixing at the fire nozzle. The gas cannot be completely combusted due to insufficient mixing, and the flame temperature is low, and the excessive air coefficient also reduces its thermal efficiency. , resulting in waste of gas, incomplete combustion of exhaust gas will cause damage to the environment and health, and the safety of the co...

AI Technical Summary

Problems solved by technology

Before combustion, the gas and air are not completely premixed in proportion, but are burned while mixing at the fire nozzle. The gas cannot be completely combusted due to insufficient mixing, and the flame temperature is low, and the excessive air coefficient also reduces its thermal efficiency. , resulting in waste of gas, incomplete combustion of exhaust gas will cause damage to the environment and health, and the safety of the combustion process is low; and the volume of the fire row is large, and the stroke required for combustion is long, which inevitably increases the total volume of the burner and The volume of the equipment using the burner

[0004] The pre-mixed combustion gas is more fully mixed, but because the gas is already in a combustible state mixed with air before starting to burn, in this case, it is easy to produce flashback and ignition and deflagration in a relatively closed space, which brings safety hazards

In order to solve this problem, some people in the prior art use a porous ceramic plate as a combustion head, but the material of the ceramic plate has poor temperature resistance, low mechanical strength, low porosity, poor sealing with the metal shell, and often occurs during use. Explosion and weathering, the service life is low, so it cannot completely solve the problem of tempering and ignition and deflagration in relatively confined spaces

[0005] Most of the steam generators on the market are directly discharged after the high-temperature flue gas exchanges heat with water, and the remaining heat in the flue gas cannot be effectively utilized. In order to improve the utilization rate of the waste heat of the flue gas, some people in the prior art use the The residual heat preheats the incoming water, but the combustion head adopts the fire row diffusion combustion, which leads to insufficient combustion and increases the volume of the steam generator. After the steam generator is used for a long time, it is easy to form scale in the inner tank. The existence of heat exchange reduces the area of ​​heat exchange, which increases the amount of gas used to generate the same steam, resulting in waste of gas, water and electricity, and the scale will cause the inner tank to rupture

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