Novel fluidized bed smoke furnace

Abstract

The invention discloses a novel fluidized bed smoke furnace. The novel fluidized bed smoke furnace comprises a supporting platform. The supporting platform is provided with a furnace body. The furnacebody is internally provided with a main hearth and an auxiliary hearth. A fire barrier is arranged between the main hearth and the auxiliary hearth. The auxiliary hearth is internally provided with adust collection wall, and the auxiliary hearth is provided with a smoke outlet. An air bellow for supplying air to the main hearth is arranged below the main hearth, and the air bellow is provided with an auxiliary combustion air pipe for supplying air to the auxiliary hearth. The supporting platform is divided into two parts, one part is used for supporting lean-phase zones of the main hearth and the auxiliary hearth, and the other part is used for supporting dense-phase zones of the main hearth and the auxiliary hearth. A furnace wall of the main hearth is provided with a plurality of setsof gravity type positive pressure high-temperature feeders. Each gravity type positive pressure high-temperature feeder comprises a feeding pipe extending into the hearths, wherein the inner end of the feeding pipe extends into positive pressure zones in the hearths. One end of the air bellow is provided with a main air pipe, the main air pipe is provided with a nozzle extending into the hearths and an air guiding pipe connected with the outer ends of the feeding pipes. By means of the novel fluidized bed smoke furnace, the fuel adaptation and the combustion intensity are improved, and meanwhile the service life of a furnace body is not affected.

Description

technical field [0001] The invention relates to the technical field of fluidized bed flue gas furnaces, in particular to a novel fluidized bed flue gas furnace. Background technique [0002] The fluidized bed flue gas furnace is a type of furnace used for burning granular fuel. The traditional fluidized bed flue gas furnace is also called a boiling furnace. It consists of a furnace body and a fluidized air distribution device. The granular fuel passes through the fuel feeding port by gravity. It is sent to the hearth of the fluidized furnace, and the combustion-supporting air is sent into the hearth by the bellows, and the fuel is suspended and burned on the hearth through the fluidized air distribution plate. live. [0003] With the progress of industrialization, the requirements for industrial equipment are gradually increasing. The traditional fluidized bed furnace type has the following problems: [0004] 1. It is difficult to enlarge the furnace body. The original flu...

AI Technical Summary

Problems solved by technology

[0004] 1. It is difficult to enlarge the furnace body. The original fluidized bed furnace type is mostly less than 14MW furnace type. The traditional straight wall structure can meet the requirements of use. In the process of large-scale furnace body, due to the increase in the height of the furnace wall, the furnace wall The expansion of the furnace is increased, and the height is increased without increasing the thickness of the furnace wall, the life of the furnace body is greatly reduced, and the maintenance cycle of the furnace wall is shortened

[0005] 2. The fuel adaptability is poor. There are various types of pellet fuel. According to the volatile content from low to high, the ignition temperature of the fuel burns from high to low. The traditional furnace type does not have a lot of fuel adaptability. Good adjustability, high requirements for the operator's experience as a fireman, low fault tolerance and tolerance in the combustion process

[0006] 3. The combustion intensity of the furnace is low. During the combustion process of the traditional furnace type, the volume space of the furnace is insufficiently utilized. When the fluidized bed furnace is working, the furnace can be divided into a dense phase area at the lower end and a dilute phase area at the upper end. The dense phase area of ​​the traditional furnace type The phase zone is short, and the local high-temperature zone cannot be adjusted, resulting in coke hanging on the furnace wall. Lengthening the dense phase zone is beneficial to improve the combustion intensity, but the traditional furnace type has the problem of difficult feeding in the dense phase zone: the current feeding method in the dense phase zone is A screw conveyor passing through the furnace wall is installed in the dense phase area of ​​the furnace, accompanied by cooling air, and the material is forced to be fed into the dense phase area of ​​the furnace through the screw conveyor. After the fuel enters the furnace, it is immediately mixed with a large amount of the dense phase area. The collision, friction, pulverization and combustion of the fluidized granular fuel greatly increase the burnout rate of the fuel, but when the furnace is shut down, the system will also shut down the fluidized cooling air, the screw conveyor stops feeding, and the fuel in the screw cannot All emptying will cause the spiral discharge port to continue to burn slowly, causing equipment damage or blockage, and the next time the machine is turned on to continue production, it will not be able to feed normally, and it needs to be cooled and cleaned. The labor intensity is high and the production efficiency is affected.

[0007] 4. It is difficult to utilize waste heat. In the industrial production system, the entire operation area is no longer independently operated. The waste heat and waste gas of other systems can be recycled and reused according to specific characteristics. However, due to the structural limitations of traditional furnaces, the dense phase combustion area It is not separated from the dilute phase combustion zone, and the waste heat exhaust gas can only be recycled through the flue gas outlet, and the utilization rate of waste heat is low

[0008] 5. The labor intensity is high. The main labor intensity of the traditional fluidized bed flue gas furnace lies in slag discharge and stoker. Because the temperature of the waste slag discharged from the fluidized bed is high, generally 300~600 degrees, the slag discharge amount of a large furnace can reach 0.1~ 0.2t, the surrounding area of ​​the slag outlet is accompanied by dust and radiant heat, the environment is poor, and the waste heat of the waste slag has not been collected and reused

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