Movable insulation board structure capable of adjusting hearth temperature

Abstract

The invention discloses a movable insulation board structure capable of adjusting hearth temperature. The movable insulation board structure capable of adjusting the hearth temperature comprises an outer layer fixing thermal baffle, a middle layer thermal baffle, an inner layer thermal baffle, middle layer fixing guide slots, inner layer fixing guide slots, left side fixing support steel, a left side angle steel fixing member, a right angle steel fixing member, right side fixing support steel, a push-pull rod and idler wheels; the aim that the inner layer thermal baffle and the middle layer thermal baffle can move left and right along the respective fixing guide slots is realized by controlling the left end of the push-pull rod. A thermal baffle moving device is adopted, the thermal insulation area is changed by moving the thermal baffles so as to adapt to the change of a load and a coal type, the stable burning during low load operation or degradation of coal quality of a small-sized industrial pulverized coal boiler is effectively realized, and the efficiency and the operation safety of the boiler are improved; the flue gas temperature of a hearth outlet is effectively adjusted by changing the thermal insulation area of the thermal baffles, and the lower thermal efficiency caused by overhigh temperature and the low temperature corrosion caused by over low temperature of the boiler are prevented.

Description

technical field [0001] The invention relates to a heat shield structure for a small industrial pulverized coal boiler, in particular to a movable heat shield structure capable of adjusting the furnace temperature. Background technique [0002] my country's coal-fired industrial boilers are mainly chain furnaces, and the combustion efficiency of chain furnaces is generally relatively low. According to the efficiency test report of more than 3,000 chain boilers conducted by Zhejiang Special Equipment Research Institute in 2012, the average efficiency is about 68%. The reasons for the low efficiency of the chain furnace are: (1) The air coefficient of the excessive exhaust gas is large, reaching 2.5-3.5, which makes the heat loss of the boiler exhaust gas very large. (2) The slag has a high carbon content and a large amount of coal leakage, resulting in a large loss of mechanical incomplete combustion. [0003] The pulverized coal industrial boiler adopts suspension combustion...

AI Technical Summary

Problems solved by technology

The reasons for the low efficiency of the chain furnace are: (1) The air coefficient of the excessive exhaust gas is large, reaching 2.5-3.5, which makes the heat loss of the boiler exhaust gas very large

(2) The high carbon content of the slag and the large amount of coal leakage cause large mechanical incomplete combustion losses

When the boiler load decreases or the coal quality deteriorates, the overall temperature of the furnace will drop rapidly, which will easily cause unstable combustion and even flameout. At the same time, the fly ash combustibles will increase and the boiler efficiency will decrease.

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