Horizontal type reversal combustion coal-fired water heating boiler

Abstract

The invention discloses a horizontal type reversal combustion coal-fired water heating boiler. The horizontal type reversal combustion coal-fired water heating boiler comprises a water cooling wall composed of an inner container and an outer container. A water pipe penetrates through a combustion chamber. A water tank is connected with the water cooling wall, and six-return-stroke smoke pipe bundles are arranged in the water tank. The horizontal type reversal combustion coal-fired water heating boiler is characterized in that fresh air enters the combustion chamber from two air inlets at an inlet air baffle; coal briquettes are laid on the water pipe to be combusted, and solid carbon separated out of the volatile component falls on refractory bricks and is combusted thoroughly. Generated smoke enters smoke pipes, the direction of the smoke changes when the smoke passes through each flame turning opening, and finally the smoke is discharged out of a smoke outlet. A chimney is additionally formed in the upper portion of the combustion chamber and used for positive combustion banking. Positive pressure reversal combustion is realized through the horizontal type reversal combustion coal-fired water heating boiler, the volatile component and the solid carbon of the coal are combusted separately, so that the combustion efficiency is improved, and emission of pollutants is lowered. The generated smoke passes through the smoke pipes and exchanges heat with water, so that the heat of the smoke is fully used. Conversion from reversal combustion to positive combustion is achieved and used for night banking, increase of coal consumption caused by frequent starting and stopping of the boiler is avoided, and the horizontal type reversal combustion coal-fired water heating boiler is compact in overall structure and convenient to install.

Description

technical field [0001] The invention relates to a hot water boiler, in particular to a horizontal reverse combustion coal-fired hot water boiler. Background technique [0002] Most of the existing vertical or horizontal hot water boilers are normal-fired boilers, which include ash hopper, fire grate, combustion chamber, flue exhaust duct, water wall, chimney, etc. from bottom to top. The coal block enters the combustion chamber from the coal inlet at the top, and is at the top of the flame. Before the coal block burns, dry distillation occurs first, and the volatile matter is precipitated and burned, and then burns out after turning into solid charcoal. Partial gas flows upward from the top and inside of the coal seam along with the flue gas. The new coal that has just entered the combustion process will be prematurely turned into particulate smoke and discharged from the furnace before it burns to red charcoal and burns out, thus generating black smoke. [0003] In order t...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of the above-mentioned reverse combustion boiler in the prior art, such as black smoke due to insufficient oxygen supply in the high-temperature coal seam, poor heat exchange effect between flue gas and hot water, and failure to close the furnace, etc., to provide a guarantee The combustion is sufficient, the heat exchange effect is good, and the reverse combustion boiler that can realize the sealing of the furnace without frequent ignition

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