Checker for hot state air leakage gap of air preheater

Abstract

The checker for a hot state air leakage gap of an air preheater belongs to the field of thermal power generation technology, and is composed of a sensing assembly 1 and a stroke switch 2 which are covered by the outer casing, a base 7, an optical display box 3, and a connecting plate mounted on the sector plate. The sensing assembly 1 is mounted on a lower end of the base 7, and a gap measuring end of a swinging rod 6 extends beyond a bottom surface of the base 7 to be in contact with an upper surface of a rotor. The stroke switch 2 is mounted in the middle and upper portions of the base 7. Anupper plane of the middle portion of the swing rod 6 is in contact with a roller 9 of the stroke switch 2. Two wires are led out by a normally open contact 13 of the stroke switch 2, one is connectedin series with a 220V power supply neutral line, and the other is connected in series with a signal light of the optical display box 3. When the air preheater is operated, the rotor is thermally deformed, and the air leakage gap reaches zero, a radial push rod 11 of the roller 9 pushes the button 8, so that the normally open contact of the stroke switch 2 is closed, and a signal light connected to the optical display box 3 is lightened, indicating that the air leakage gap of the measuring point has reached an extreme value. According to the checker for the hot state air leakage gap of the airpreheater, accidents can be prevented from being stuck in the rotor of the air preheater, a minimum air leakage gap can be found. The checker for the air leakage gap is used for thermal power generation.

Description

Technical field [0001] Thermal power generation. Background technique [0002] The air preheater of thermal power plant, referred to as "air preheater" in the industry, is a kind of high-temperature flue gas removed from combustion to preheat the air involved in combustion, thereby improving the thermal efficiency of the boiler. The pair of seals separating the flue gas side and the air side is the moving part rotor and the static part sector plate, which belongs to the movement seal between the dynamic and static matching surfaces. The air leakage gap of moving and static parts determines the sealing effect. When the air preheater is running in a hot state, the rotor is heated and expands into a mushroom shape, and the air leakage gap between the fan and the fan plate changes, and most of them will become smaller. If the air leakage gap is too large, the air leakage rate will increase and the boiler thermal efficiency will decrease; if the air leakage gap is too small, the air...

AI Technical Summary

Problems solved by technology

If the air leakage gap is too large, the air leakage rate will increase and the thermal efficiency of the boiler will decrease; if the air leakage gap is too small, the air preheater may be stuck

In fact, the air preheater is stuck, the motor is burned out, and there are maintenance accidents

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