Flue gas distributor controlled according to outlet temperature difference and boiler system

Abstract

The invention discloses a flue gas distributor controlled according to the outlet temperature difference and a boiler system. A temperature sensor is arranged on each of the two sides of a flue gas outlet of the flue gas distributor, the temperature sensors detect the flue gas temperature of the two side positions of the flue gas outlet, the temperature sensors are in data connection with a controller, the controller reads the detected temperature and calculates the temperature difference, and the controller automatically controls a driving mechanism to adjust an adjustable flow guide plate to stretch or retract by a set distance relative to a fixed flow guide plate according to the calculated temperature difference so as to change the areas of the flow guide plates. By calculating the temperature difference of different positions of the outlet, the outlet flue gas temperature difference is automatically controlled to be kept within a certain range, the outlet flue gas temperature is kept balanced, and therefore the temperature difference is kept within a certain range.

Description

technical field [0001] The invention relates to the field of heat exchangers, in particular to an area-controlled flue gas distributor and a boiler system. Background technique [0002] The L-shaped flue gas distributor is a common equipment for the outlet flue of the air preheater. It is used to evenly divide the flue gas at the flue gas side outlet of the air preheater, reduce the flue gas flow rate at the inlet of a single dust collector, and improve the dust removal efficiency. Arranging low-temperature economizers at the outlet of the distributor and the inlet of the dust collector can further reduce the exhaust gas temperature, improve boiler efficiency, and reduce pollutant emissions. The performance of the distributor is of great significance to the stable and efficient operation of thermal power units, energy saving and emission reduction. The flue gas flow rate, ash volume and temperature uniformity of the branch flue downstream of the distributor are important in...

AI Technical Summary

Problems solved by technology

If the flue gas temperature deviation is large, the flue gas temperature of some runners is lower than the original design value, and the flue gas temperature of some runners is higher than the original design value

If the flue gas temperature is lower than the design value of the flue gas temperature at the inlet of the low-temperature economizer, the heat exchange area of ​​the low-temperature economizer in the flow channel will be excessive, resulting in waste. If the design value is the same, the low-temperature economizer on this flow channel cannot be put into operation, that is, the flue gas resistance is increased, and the economic benefits in terms of heat have not yet been obtained

If the flue gas temperature is higher than the design value of the flue gas temperature at the inlet of the low-temperature economizer, the heat exchange area of ​​the low-temperature economizer in the flow channel will be insufficient. Although there will be some margin in the selection of the low-temperature economizer, but If the flue gas temperature exceeds the design value too much, the flue gas temperature at the outlet of the low-temperature economizer will not be reduced to the designed flue gas temperature at the outlet of the low-temperature economizer, resulting in waste of heat

[0006] The heat transfer area of ​​the low-temperature economizer on each channel is the same, and the inlet flue gas temperature is different. In order to achieve the same outlet flue gas temperature, the condensate flow rate of each low-temperature economizer must be different. Each low-temperature economizer There is also a regulating valve on the water pipeline of the coal boiler, which brings difficulties to the operation and regulation

The temperature at the inlet of the low-temperature economizer is deviated, while the temperature at the outlet of the low-temperature economizer is the same, which will aggravate the deviation of the actual flue gas volume of each channel, resulting in the deviation of the flue gas volume in each channel of the dust collector, which has a great impact on dust removal effect

[0007] In the previous application, a flue gas distributor with an adjustable area was proposed. By setting an adjustable deflector, the area of ​​the deflector can be increased or decreased according to actual needs, thereby adjusting the degree of flue gas mixing and the size of the resistance. , to meet the actual needs of different heat conduction, but the above adjustment has hysteresis and cannot be intelligently controlled

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