Heat energy comprehensive utilization device of heat-power system with steam boiler

Abstract

Provided is a heat energy comprehensive utilization device of a heat-power system with a steam boiler. Firstly, steam boiler feed water performs heat exchange with low-temperature flue gas ready to flow into a dust remover in a first-level economizer; secondly, the steam boiler feed water performs heat exchange with waste steam in a sectional regenerative isobaric preheater, the heat exchange stage is performed by echelons, the echelon number is the section number of the sectional regenerative isobaric preheater, and the set of the section number of the sectional regenerative isobaric preheater is determined according to the amount of the waste steam and pressure of the whole heat-power system; thirdly, the steam boiler feed water performs heat exchange with high-temperature flue gas flowing out of a steam boiler furnace just now in a second-level economizer. The steam boiler feed water and waste heat energy carriers (flue gas, waste steam) of the heat-power system do dividing wall reverse flow in constrained space, through performing heat exchange by stages and echelons, heat energy brought by the waste heat energy carriers can be exchanged to the steam boiler feed water to the maximum extend, and therefore the purpose of completely utilizing the heat energy is achieved.

Description

technical field [0001] The invention relates to the technical field of steam boilers, in particular to a thermal energy comprehensive utilization device of a thermal system containing a steam boiler. Background technique [0002] At present, there are two modes widely used for steam boiler feed water preheating: the first is the single economizer preheating mode supported by most boiler plants, in which the feed water only performs simple heat exchange with the flue gas in the economizer; The second is the hot water tank plus economizer feed water preheating mode modified by some users. This mode introduces the waste steam of the system heating system into the tubular heat exchanger in the open water tank to heat the treated water, and then feeds it The water pump injects the preliminary preheated water into the boiler through the economizer. The first steam boiler feedwater preheating mode only has the heat exchange process between the steam boiler feedwater and the flue ...

AI Technical Summary

Problems solved by technology

Once the water entering this area exceeds a certain temperature, it will evaporate and vaporize in this negative pressure area. Slight vaporization will affect the stable operation of the feed water pump, and severe vaporization will form steam blockage, which will interrupt the water supply and endanger the operation safety of the boiler.

This is also a serious bottleneck of the current boiler feed water preheating temperature is not high

Neither of these two steam boiler feedwater preheating modes can fully exchange the heat energy of flue gas and waste steam in the heating system to boiler feedwater

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