Rotating type air pre-heater sector plate

Abstract

The invention relates to a rotating type air pre-heater sector plate. The rotating type air pre-heater sector plate is fixedly installed at the upper portion of a rotor of an air pre-heater, a sealing sheet is arranged on the rotor of the air pre-heater, the sector plate comprises an upper fixing plate and a connecting plate, and fixing I-shaped steel capable of having the connecting supporting effect is fixedly arranged between the upper fixing plate and the connecting plate; a plurality of key type sealing plate structures capable of being in contact with the sealing sheet are arranged at the lower portion of the connecting plate, the positions between the key type sealing plate structures and the two sides of the connecting plate are each provided with a sliding sealing strip hole with a sliding sealing strip, and lateral face plates of the key type sealing plate structures penetrate through the sliding sealing strip holes and can freely and vertically slide in the sliding sealing strip holes. The similar key type structures are adopted in the rotating type air pre-heater sector plate, and the good deformation contact can be generated between the similar key type structures and the sealing sheet, so that the air leakage rate of the rotating type air pre-heater sector plate is reduced to a large extent; in this way, the sector plate is simple in overall structure, convenient to install and manufacture and high in practicability.

Description

Technical field: [0001] The invention relates to a fan-shaped plate of a rotary air preheater on a thermal power generating set. Background technique: [0002] The rotary air preheater, as the flue gas and air heat exchange equipment of the thermal power generation unit, has a great influence on the power generation efficiency of the thermal power generation unit. In addition to the heat storage capacity of the heat transfer element of the rotary air preheater affecting the heat transfer efficiency, another The air leakage rate of the index also has a relatively large impact on the heat exchange efficiency, and the air leakage rate of the rotary air preheater not only affects the heat exchange efficiency, but also affects the primary and secondary air temperature and air volume, thereby affecting the combustion efficiency of the unit. In addition, the rotary air preheater The increase of the air leakage rate of the rotary air preheater will affect the exhaust gas temperature...

AI Technical Summary

Problems solved by technology

[0002] The rotary air preheater, as the flue gas and air heat exchange equipment of the thermal power generation unit, has a great influence on the power generation efficiency of the thermal power generation unit. In addition to the heat storage capacity of the heat transfer element of the rotary air preheater affecting the heat transfer efficiency, another The air leakage rate of the index also has a relatively large impact on the heat exchange efficiency, and the air leakage rate of the rotary air preheater not only affects the heat exchange efficiency, but also affects the primary and secondary air temperature and air volume, thereby affecting the combustion efficiency of the unit. In addition, the rotary air preheater The increase of the air leakage rate of the rotary air preheater will affect the exhaust gas temperature of the rotary air preheater, aggravate the corrosion and dust blocking of the cold end, and the traditional fan plate in the industry is a fixed structure without gap compensation. When the rotary air preheater When the rotor is thermally deformed, the gap between the sealing sheet and the fan-shaped plate will increase, which will directly affect the air leakage rate of the rotary air preheater. According to statistics, the air leakage rate of the rotary air preheater using this fan-shaped plate is generally above 8%. The main research direction of the sealing technology of type air preheater is on the radial sealing sheet. For example, a hinge-type flexible contact sealing assembly is installed on the sealing sheet. (This situation is very common), the components of this sealed form will be partially in contact with the fan-shaped plate, but not completely in contact. Another technology is the sealing form of leakage air recovery, and the fan-shaped plate is slotted to install the air induction system to suck out the leaked air and send it back to the secondary air side to realize the air leakage control of the rotary air preheater, but this technology is difficult to control and suck back the leaked air in practical applications, and often sucks a large amount of flue gas to the secondary air side The secondary air side, which will reduce the heat exchange efficiency of the air preheater, the fan of this system has high energy consumption, complex structure, and high operation and maintenance costs

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