Comprehensive gradient utilization system for waste heat of thermal power plant

Abstract

The invention discloses a thermal power plant waste heat comprehensive gradient utilization system which comprises a heat conveying belt used for conveying blocky sludge, a hot water pipe set arranged on the heat conveying belt, an air heater used for supplying air from bottom to top, a drainage assembly and a water conveying pipe. The heat conveying belt comprises two oppositely-arranged conveying frames, a driving roller, a plurality of driven rollers and a conveying belt arranged on the driving roller and the driven rollers in a sleeving mode. The driving roller and the driven rollers are rotationally arranged between the two conveying frames. The hot water pipe group comprises a water inlet pipe, a water outlet pipe and a plurality of heating pipes connected with the water outlet pipe and the water inlet pipe; the drain assembly is used for inputting drain water in the drain tank into the water inlet pipe; the water transmission pipe is connected to the water outlet pipe; and the driven roller is arranged on the heating pipe in a sleeving manner. The method has the effect of improving the hydrophobic heat utilization rate.

Description

technical field [0001] The present application relates to the field of waste heat utilization systems, in particular to a comprehensive cascade utilization system for waste heat of thermal power plants. Background technique [0002] Power station boilers are mainly divided into pulverized coal boilers and circulating fluidized bed boilers. The circulating fluidized bed boilers use the clean coal combustion technology with the highest degree of industrialization. [0003] When the boiler is in normal operation, steam flows away in its steam pipe. When the boiler is out of operation, the steam in the steam pipe will release heat and condense into water. These condensed water are collectively referred to as "drainage". Condensed water is not allowed inside the steam pipeline. The condensed water generated after the shutdown of the boiler is discharged out of the steam pipeline through the drain line connected to the steam pipeline, thereby protecting the flange of the steam tur...

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Problems solved by technology

[0005] In the process of implementing this application, the inventors found that there are at least the following problems in this technology: Although the temperature of the drain is not enough for power generation, it still has a relatively high temperature, and the natural cooling of the drain after entering the drain tank causes energy waste, which needs to be improved

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