Boiling cooling method and slag cooling device with a superposed tunnel
A cooling tunnel and ebullient technology, applied in the cooling method and equipment field of circulating fluidized bed boiler bottom slag, can solve the problem of affecting the safe operation of circulating fluidized bed boiler, unstable slag discharge and ash discharge, and heat recovery cost value Advanced problems, to achieve the effect of comprehensive utilization, simple structure and long service life
Inactive Publication Date: 2009-08-05
王学书
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Problems solved by technology
Compared with the pulverized coal furnace, the bottom slag discharge of the circulating fluidized bed boiler accounts for more than 50% of the total ash volume of the boiler; at the same time, the slag discharge of the circulating fluidized bed boiler has unstable ash and slag discharge, high temperature and heat content Large, high cost of heat recovery, and uneven bottom slag particles; in addition, due to the different slag particles often cause bridge blockage, slag cooler wear and other failures
Therefore, such a slag treatment system directly affects the safe operation of the circulating fluidized bed boiler
Method used
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[0029] The ebullient cooling method of high-temperature ash is described in detail with reference to the accompanying drawings:
[0030] (1) The high-temperature ash is fed from the inlet 2 and hits the impact weighing device 3;
[0031] (2) After the weight is accumulated, it enters the cooling chamber 10 of the upper cooling tunnel 14. Due to the action of the partition plate 9 and the upper corrugated air deflector 15, the high-temperature ash slag is boiled and moved. Operation under slight negative pressure;
[0032] (3) The first cooling chamber 10, the second cooling chamber 11, and the third cooling chamber 12 form several temperature gradients, and the high-temperature ash drops from 850°C to 500°C, 400°C, and 300°C;
[0033] (4) The ash enters the fourth cooling chamber 17, the fifth cooling chamber 18, and the sixth cooling chamber 19 on the lower floor, and is cooled to 100°C;
[0034] (5) Normal temperature and high pressure wind enters the upper corrugated air ...
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The boiling cooling method is: high-temperature ash enters the cooling chambers of the upper and lower cooling tunnels successively, and is boiled and moved under the action of high-pressure wind and the upper and lower corrugated air guide plates, as well as the temperature gradient, and also forms Heat exchange air dynamic field; the mixed hot air brings the unburned light slag back to the boiler through the flue gas outlet, and the large particle ash is discharged from the slag outlet after cooling. A boiling slag cooler with stacked tunnels, including a box body composed of buried tube water walls, insulation layers and partitions, with a high-temperature slag inlet and a high-temperature flue gas outlet on the top; upper and lower ebullating beds, As a result, two cooling tunnels, upper and lower, are formed, each of which is provided with at least three cooling chambers; the upper and lower corrugated air deflectors are respectively arranged on the upper and lower fluidized beds, and the upper and lower air distribution chambers are located below them. 1. A compressed air control valve is provided at the entrance of the lower cooling tunnel; an air inlet pipe connected with the air guide hole is provided on the lower wall of the box body.
Description
technical field [0001] The invention relates to a boiling type cooling method and a boiling type slag cooler with stacked tunnels, belonging to a cooling method and equipment for circulating fluidized bed boiler bottom slag. Background technique [0002] In recent years, this field has developed rapidly. There are many kinds of slag coolers at home and abroad, such as barrel type slag coolers, box type slag coolers, wind type slag coolers or water type slag coolers. Calcium injection desulfurization in bed boilers can burn inferior fuels with low calorific value. Compared with the pulverized coal furnace, the bottom slag discharge of the circulating fluidized bed boiler accounts for more than 50% of the total ash volume of the boiler; at the same time, the slag discharge of the circulating fluidized bed boiler has unstable ash and slag discharge, high temperature and heat content Large, high cost of heat recovery, and uneven bottom slag particles; in addition, due to the di...
Claims
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IPC IPC(8): F23C10/18
Inventor 张启峰
Owner 王学书