Arc plate zoom adjustable shrinkage cavity used for coal-fired power plant primary air pipe and work method thereof

Abstract

The invention relates to an arc plate zoom adjustable shrinkage cavity used for a coal-fired power plant primary air pipe and a work method thereof. The problem that an existing shrinkage cavity is clamped during adjusting is solved. The shrinkage cavity comprises a zoom adjustable shrinkage cavity mechanism and an execution mechanism, the zoom adjustable shrinkage cavity mechanism is located in aprimary air pipe, the zoom adjustable shrinkage cavity mechanism is in contact with the execution mechanism, the zoom adjustable shrinkage cavity mechanism comprises a lifting connecting rod, a triangular arc plate, a connecting buckle, a connecting rod, a sleeve and an adjusting cam, the execution mechanism comprises a sliding wheel, an A side horizontal connecting rod, an A side adjusting handwheel, a B side horizontal connecting rod, a B side adjusting hand wheel and a sliding vehicle body, the triangular arc plate, the lifting connecting rod and the driving sliding vehicle form the zoomadjustable shrinkage cavity, good seal and smooth adjusting can be achieved, the throttling effect is gentle, the pulverized coal accumulation area is removed, and the influence on the pulverized coaluniformity is reduced.

Description

technical field [0001] The invention relates to a zoom-type adjustable shrinkage cavity of an arc-shaped plate used for a primary air duct of a coal-fired power plant and a working method thereof. Background technique [0002] At present, the primary air duct of coal-fired power plants generally adopts the push-in half-moon-shaped double-core adjustable shrinkage cavity, such as the Chinese patent application number 201720757636. A lot of difficulties came, which affected the adjustment of the wind speed, caused throttling loss, and shortened the service life. [0003] The main disadvantages of the push-in half-moon double-core adjustable shrinkage cavity: 1) The sealing structure is too simple, and the coal powder in the pipe leaks through the gap between the insert plate and the valve body, causing the screw to fail to rotate or the rotating mechanism to be stuck. The resistance is too large or the adjustment effect is invalid; 2) The half-moon-shaped adjustable shrinkage...

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Problems solved by technology

[0002] At present, the primary air duct of coal-fired power plants generally adopts the push-in half-moon-shaped double-core adjustable shrinkage cavity, such as the Chinese patent application number 201720757636. It was a great difficulty, which affected the adjustment of wind speed, and also caused throttling loss, and shortened the service life at the same time.

[0003] The main disadvantages of the push-in half-moon double-core adjustable shrinkage cavity: 1) The sealing structure is too simple, and the coal powder in the pipe leaks through the gap between the insert plate and the valve body, causing the screw to fail to rotate or the rotating mechanism to be stuck. The resistance is too large or the adjustment effect is invalid; 2) The half-moon-shaped adjustable shrinkage cavity has a large throttling loss; 3) The half-moon-shaped baffle is easy to accumulate coal powder, resulting in natural coal powder; The scouring force of the pulverized air flow is very large; 5) It affects the uniformity of the distribution of pulverized coal particles in the primary wind, resulting in high pulverized coal concentration in the center and low pulverized coal concentration around

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