Efficient ash removal device and method suitable for garbage furnace

Abstract

The invention discloses an efficient ash removal device and method suitable for a garbage furnace. Existing boiler ash removal has the defects of high failure rate, large mechanical and electrical maintenance and repair amount, high operation cost and the like. The efficient ash removal device suitable for the garbage furnace comprises a tail flue (1), wherein a high-temperature heating surface (2) and a low-temperature heating surface (10) are arranged on the upper part and the lower part in the tail flue correspondingly, an electromagnetic gate valve (3) is installed at an opening in the bottom of the tail flue, a fly ash and steel ball separator (9) is installed below the electromagnetic gate valve, a separating screen (13) is obliquely installed in the middle of the fly ash and steel ball separator, and a separating door (14) is installed on the lower end side of the separating screen; the separating door is connected with a sealing elevator (4), an outlet of the sealing elevator is connected with a steel ball storage box (5), a group of openings are formed in the bottom of the steel ball storage box and connected with a descending passage (6), and the descending passage is connected with a high-temperature side disperser (8), a high-temperature central disperser (11) and a low-temperature side disperser (12) through a buffering box (7). The efficient ash removal device is suitable for the garbage furnace.

Description

technical field [0001] The invention relates to the technical field of power station boilers and industrial boilers, in particular to a high-efficiency ash removal device and ash removal method suitable for garbage furnaces. Background technique [0002] Boiler heating area ash is a common problem in boiler operation. The hazards caused by boiler ash accumulation mainly include: 1) The temperature of the exhaust gas increases, which reduces the economic efficiency of the boiler operation; 2) The resistance of the flue gas increases, resulting in the overload of the induced draft fan; 3) Reduce the life of the heating surface, especially, the dust accumulation of the air preheater on the heating surface of the tail flue is very easy to occur, and it is easy to deteriorate to form ash plugging, and further air preheater corrosion is closely related to the ash plugging; [0003] When the air preheater is blocked with dust, the heating surface of the air preheater is scaled due ...

AI Technical Summary

Problems solved by technology

[0002] Boiler heating area ash is a common problem in boiler operation. The hazards caused by boiler ash accumulation mainly include: 1) The temperature of the exhaust gas increases, which reduces the economic efficiency of the boiler operation; 2) The resistance of the flue gas increases, resulting in the overload of the induced draft fan; 3) Reduce the life of the heating surface, especially, the dust accumulation of the air preheater on the heating surface of the tail flue is very easy to occur, and it is easy to deteriorate to form ash plugging, and further air preheater corrosion is closely related to the ash plugging;

[0003] When the air preheater is blocked with dust, the heating surface of the air preheater is scaled due to long-term accumulation of dust, and water vapor and SO3 are easy to adhere to the dust, which aggravates the corrosion of the air preheater. The surface finish has deteriorated seriously, which has aggravated the dust accumulation of the air preheater. When the air preheater is blocked and corroded, the temperature of the primary and secondary air at the outlet of the air preheater will decrease significantly during operation, and the exhaust gas temperature will increase significantly. Reduced boiler efficiency;

[0004] At present, the boiler soot cleaning technologies in the existing technology mainly include three types: steam soot blowing, sonic soot cleaning and gas shock wave soot cleaning; Therefore, there are a lot of moving parts, which results in frequent operation of the soot blower, high failure rate, large amount of mechanical and electrical maintenance and overhaul, and at the same time, a large loss of working medium and high operating costs; in addition, the use of steam soot blowers, It will increase the moisture content in the flue gas and increase the dew point temperature of the flue gas, thereby increasing the ash blocking and corrosion phenomenon at the cold end of the economizer; the effect of sonic cleaning depends on the flow and pressure of the compressed air used. When the parameters of the medium compressed air are low, the soot blowing effect will be significantly weakened; the deflagration shock wave is used for shock wave cleaning, and the stability is not strong. When cleaning the dust, the impact is small and the cleaning effect is poor. In addition, the directivity of the shock wave cleaning is strong, so there are many dead spots or areas with weak soot blowing effect

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