Method for rotary burning of thin coal layer

Abstract

The invention belongs to the field of raw coal burning, and particularly relates to a method for burning coal particles arranged in a rotary burning chamber provided with a high temperature fire bed. The method comprises the following steps: the coal particles are input into a coal measure feeder and are fed into a wind power coal feeding pipe arranged in a coal feeding rod; a coal output end of the coal feeding rod is arranged above the cavity of a rotating furnace and reciprocates along the radius of the furnace cavity, and the coal particles are fed into the furnace cavity by wind power; under the reciprocating action of the coal feeding rod and the rotating action of the furnace cavity, the coal particles form a uniform coal layer on the surface of the fire bed; under the rotating actions of the furnace cavity and a slag extractor, the coal layer ignites and burns by the combination with oxygen in combustion air; and the coal layer rotates in the furnace cavity, the slag extractorrotates, crashes and collects slag, and the slag falls in a slag discharging pipe and is discharged. The method has the advantages of the rotary burning of the thin coal layer, the combustion supporting of secondary air, reasonable and scientific coal burning, and adequate and complete burning, improves the thermal efficiency and reduces the coal consumption by 30%. The used equipment has the advantages of compact and reasonable structure, low manufacturing cost, safety, reliability and low operation cos. The defects that burning machines are dirty, disorderly and bad and pollute the environment are avoided.

Description

technical field [0001] The invention belongs to the field of raw coal combustion, in particular to a combustion method in which coal particles are placed in a rotating combustion chamber with a high-temperature fire bed. Background technique [0002] At present, there are a large number of coal-fired equipment using raw coal as fuel in various industries such as boilers, iron and steel, machinery, and building materials. The technical level of large-scale coal-fired equipment in my country, such as large-scale thermal power plants, has entered the world's advanced ranks. Generally speaking, the technical level of small and medium-sized coal-fired equipment is still relatively low, and common problems include low combustion efficiency, rough combustion control, many equipment failures, and metal consumption. Large amount, large coal consumption, and environmental pollution during combustion. Chain grate and reciprocating grate coal-fired equipment are the most widely used in ...

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Problems solved by technology

[0007] 1. Large waste of energy: the chemical incomplete combustion loss of this combustion method can reach 2%, the mechanical incomplete combustion loss can reach 15%, and the coal leakage loss of equipment can reach 5%. , operations, and management levels are different, the above-mentioned losses may be even greater

[0008] 2. The equipment used in this coal-fired method is huge, complex in structure, and operates continuously at high temperature, so there are many fault points and difficult to repair. Once a fault occurs, only downtime maintenance affects production

[0009] 3. In this combustion method, the grate moves irreversibly in one direction, which cannot keep the high-temperature fire bed, and it is difficult to catch fire after adding new coal. In order to ensure stable combustion of the coal seam and meet the needs of the process for combustion intensity, it can It is a thick coal seam operation, the thickness of coal is generally 60-300mm, and the control of "air-to-coal ratio" in the combustion process is simple and rough, which cannot meet the requirements of scientific coal combustion at all.

[0010] 4. Insufficient detection and adjustment means make it difficult to manage and control the combustion process finely, and it is also difficult to realize computer control and management under the existing equipment conditions

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