Coal-fired boiler with main and auxiliary furnaces and ignition method thereof

Abstract

The invention relates to a coal-fired boiler with main and auxiliary furnaces. The coal-fired boiler comprises the main furnace, the auxiliary furnace and an induced draught system, wherein a main hearth and an auxiliary hearth are arranged in a combustion hearth and mutually separated by a middle retaining wall, a main air cap and a main air distribution plate are located at the top of an air chamber of the main furnace, an auxiliary air cap and an auxiliary air distribution plate are located at the top of an air chamber of the auxiliary furnace, coal layers for combustion are combusted at the top of the main air cap and the top of the auxiliary air cap correspondingly, part of combustion coal located in the main hearth crosses the middle retaining wall under the action of air pressure ofan air feeder of the main furnace to enter the auxiliary hearth to continue to be combusted, an inner circulation channel communicating the main hearth and the auxiliary hearth is formed on the middle retaining wall, and an inner circulation channel opening located on the side of the auxiliary hearth is higher than an inner circulation channel opening located on the side of the main hearth, so that the combustion coal located on the auxiliary hearth automatically falls into the main hearth through the inner circulation channel to continue to be combusted. The invention further discloses an ignition method of the coal-fired boiler. According to the ignition method, cold slag is used as a bed material, and charcoal is used as an ignition source for ignition, so that the ignition cost is reduced, and the ignition success rate is increased.

Description

technical field [0001] The invention belongs to the technical field of boiler combustion, and in particular relates to a coal-fired boiler with main and auxiliary furnaces and an ignition method thereof. Background technique [0002] The current common ignition method for boiling boilers includes: laying hot slag on the air distribution plate, laying bamboo charcoal on the hot slag, igniting to form a charcoal fire layer, making a slight negative pressure of -10Pa ~ 50Pa in the furnace, starting the blower to make the charcoal fire layer There is a slight jump but will not be buried by slag, and the crushed coal is evenly spread on the charcoal fire layer and the air volume is gradually increased to increase the temperature of the material layer. When the air supply volume reaches the minimum wind speed during normal operation, use the amount of crushed coal sprinkled in to maintain the heating rate of the material layer; Exceed the minimum wind speed within 5s; when the te...

AI Technical Summary

Problems solved by technology

[0004] 1. It is necessary to use hot slag to lay the bottom, which is very difficult for a small enterprise with only one boiler, and laying hot slag on the air distribution plate needs to be manually fed, which has potential safety hazards;

[0005] 2. The characteristics of the existing coal-fired boilers with main and auxiliary furnaces are that the main furnace is small and the auxiliary furnace is large. During the ignition process of the main furnace, it is easy to cause problems such as coking and extinguishing due to operation. Unbalanced control produces coking phenomenon, which affects the overall output of the boiler;

[0006] 3. When the boiler is just started, affected by the degree of boiling of the material layer, there is a large deviation between the actual temperature of the material layer and the temperature of the instrument. For the ignition furnace, there are problems of low-temperature extinguishment and high-temperature coking, and the temperature cannot be used to adjust the air supply and temperature. The only standard for coal

Images