Automatic air leakage control system for cold end of air preheater and control method
An air preheater and control system technology, applied in combustion methods, lighting and heating equipment, indirect carbon dioxide emission reduction, etc., can solve the problems of insufficient combustion air volume, affecting the safety and economy of boilers, etc., to reduce air leakage, improve Power generation efficiency and coal consumption reduction effect
Active Publication Date: 2014-02-19
SHANGHAI BOILER WORKS +1
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Problems solved by technology
If the air leakage is too large and exceeds the load capacity of the supply and induced draft fans, the combustion air volume will be insufficient, and the load will be forced to be reduced, which will directly affect the safety and economy of the boiler.
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[0037] In order to make the present invention more comprehensible, a preferred embodiment is described in detail below with accompanying drawings.
[0038] The air leakage control system at the cold end of the air preheater in this embodiment includes a control unit and an execution unit M corresponding to the sector plate at the cold end, preferably a rotor speed measuring device N corresponding to the air preheater. Such as figure 1 As shown, in this embodiment, the generator set (boiler) is equipped with two three-chamber air preheaters, namely the first air preheater A and the second air preheater B. Among them, three fan-shaped plates are installed at the cold end of the first air preheater A, which are respectively fan-shaped plate ACS-1, fan-shaped plate ACS-2 and fan-shaped plate ACS-3, and three fan-shaped plates are installed at the cold end of the second air preheater B. The boards are fan-shaped board BCS-1, fan-shaped board BCS-2 and fan-shaped board BCS-3. Ther...
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The invention discloses an automatic air leakage control system for a cold end of an air preheater and a method utilized by the system. The automatic air leakage control system comprises a control unit which receives signals sent from a sensor unit and controls a lifting mechanism of an actuating unit to drive a sector plate to move vertically. When the air preheater is in non-full-load running, deformation of a rotor is insufficient, a gap between a radial seal plate at the cold end of the rotor and the sector plate is wider so that air leakage of the cold end is higher, and the high air leakage rate has higher adverse affection to the integral performance of the unit. The air leakage control system controls the gap between the sector plate at the cold end of the air preheater and the seal plate at the cold end of the rotor of the air preheater and keeps the gap between the sector plate and the seal plate at the cold end minimum so as to reduce air leakage and coal consumption when a power generating unit is in non-full-load running. In addition, the automatic air leakage control system accords with policy of saving energy, reducing consumption and advocating green energy, and has great significance in improving power generating efficiency of the power generating unit.
Description
technical field [0001] The invention relates to a control system and a control method for air leakage at a cold end of an air preheater, and belongs to the technical field of air leakage control for an air preheater. Background technique [0002] The air preheater is a heat exchange device that uses the heat of flue gas to heat the air required for combustion. The air preheater can not only absorb the heat in the exhaust gas, reduce the temperature of the exhaust gas, thereby improving the efficiency of the boiler, but also because the air is preheated, it can strengthen the ignition and combustion process of the fuel, reduce the heat loss of the incomplete combustion of the fuel, and further improve the efficiency of the boiler. Increased boiler efficiency. In addition, air preheating can also increase the temperature of flue gas in the furnace and enhance the radiation heat transfer in the furnace. [0003] At present, the main problem facing the air preheater is air lea...
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IPC IPC(8): F23L15/00
CPCY02E20/34
Inventor 蔡明坤王勇匡俊杜艳青马玉顺邱冬雷
Owner SHANGHAI BOILER WORKS