Area-controlled flue gas distributor and boiler system

Abstract

The invention discloses an area-controlled flue gas distributor and a boiler system. According to the technical scheme, the area-controlled flue gas distributor is characterized in that a plurality of flow guide plates are arranged in the flue gas distributor in a staggered mode, each flow guide plate comprises a fixed flow guide plate body and an adjustable flow guide plate body, and the adjustable flow guide plate bodies are connected with a driving mechanism; and under the action of the driving mechanism, the adjustable flow guide plate bodies can stretch out or retract by a set distance relative to the fixed flow guide plate bodies so as to change the areas of the flow guide plates. According to the flue gas distributor, by arranging the adjustable flow guide plate bodies, the areas of the flow guide plates can be increased or reduced according to actual requirements, so that the flue gas mixing degree and the resistance are adjusted, and different actual heat conduction requirements are met; and the heat exchange requirement is further met, and the service life of a product is prolonged.

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

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