An environmentally friendly coal-fired boiler with staged combustion and its treatment method

Abstract

The invention provides a fractional combustion environment-friendly coal-fired boiler and a handling method thereof. A coal feeding opening is formed in the top of a boiler body, a first longitudinaldivision plate is arranged at the bottom of a boiler hearth and divides the interior of the boiler hearth into a first cavity and a second cavity, the top of the first cavity communicates with the topof the second cavity; fire tubes are arranged on the position, on the side of the first longitudinal division plate, of the upper part in the first cavity, the tops of the fire tubes are fixed to thefirst longitudinal division plate and the top of the boiler body through division plates with holes, the bottoms of the fire tubes are fixed to the first longitudinal division plate through the division plates with the holes, a second longitudinal division plate is downward arranged at the unfixed end of the division plates with the holes, the lower part of the first cavity is divided into a third cavity and a fourth cavity, the bottom of the third cavity communicates with the bottom of the fourth cavity, over fire air inlets are formed in the fourth cavity, a fire grate is arranged at the bottom of the third cavity, and an air opening is arranged on the lower part of the fire grate; and a first inclined division plate is arranged in the space, away from the first longitudinal division plate, in the first cavity. According to the fractional combustion environment-friendly coal-fired boiler and the handling method thereof, oxygen in a dry distillation pyrolysis area is eliminated in aheat conduction mode, thus dry distillation pyrolysis is achieved in true sense, the influence of the oxygen on pyrolysis is reduced, and the quantity of discharged pollutants is effectively decreased.

Description

technical field [0001] The invention belongs to the field of coal combustion equipment, and relates to an environment-friendly coal-fired boiler with staged combustion and a treatment method thereof, in particular to an environment-friendly coal-fired boiler with staged combustion improved through heat conduction and a treatment method thereof. Background technique [0002] At present, in the coal-fired boilers adopting staged combustion technology, especially the coal-fired boilers where the dry distillation pyrolysis and semi-coke combustion areas are distributed up and down, the dry distillation pyrolysis and semi-coke combustion areas are usually arranged in a row without obvious boundaries. [0003] As CN 107238111A discloses a coal-fired heating furnace, the top side of the main body is provided with a coal filling port, and the top of the main body is provided with a chimney on the side opposite to the coal filling port; The upper part of the main body of the coal-fir...

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Problems solved by technology

[0005] In view of the dry distillation pyrolysis and semi-coke combustion zones existing in the existing staged combustion boilers, there is no obvious boundary, and the dry distillation pyrolysis in the true sense cannot be realized, which may easily cause insufficient smoke elimination (black smoke), CO and NO x The emission concentration increases rapidly and the risk of furnace deflagration is high. The present invention provides an environmentally friendly coal-fired boiler with staged combustion and its treatment method

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