Low-pressure expanded economizer system

Abstract

The invention discloses a low-pressure expanded economizer system comprising a turbine, a condenser, a condensate pump, a make-up pump, a drain pump, a low-pressure expanding economizer, a recycle pump, a low pressure steam pocket, a turn-off valve and a heat exchanger. The heat exchanger comprises a heat exchanger high-temperature section and a heat exchanger low-temperature section which are mutually communicated. Non-heating season condensate working condition is utilized as a basis and heating season heat supplying working condition is combined to combine the low-pressure expanded economizer with a smoke heating network heater (heat-supplying economizer) to form one heated surface (the low-pressure expanded economizer), and users can flexibly adjust according to heating demand and electric load condition. Compared with the prior art with the low-pressure expanding economizer and the smoke heater for heating network arranged respectively, the low-pressure expanded economizer system does not need to mount the smoke heating network heater independently, pipelines and valves needed to be arranged are reduced, the structure is simple, system reliability is high, and the problem of non-heating season burning is avoided.

Description

[0001] technical field [0002] The invention relates to a central heating technology in the field of cogeneration, in particular to an enlarged low-pressure economizer system. Background technique [0003] Since the reform and opening up, the state has put forward the guideline of "emphasizing energy development and conservation, and putting conservation in the first place". When conditions permit, high-efficiency large boilers are used to replace low-efficiency small boilers, and central heating is used instead of decentralized heating. . Compared with small industrial boilers or heating furnaces, cogeneration boilers use all or part of the original waste heat to supply heat users, thereby reducing or avoiding heat loss in the cold source, and the boiler efficiency is between 75% and 90%. , its thermal efficiency is much higher than the former. In addition, the thermal efficiency of large thermal power plants is only 38% to 43%, while the thermal efficiency of thermal po...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an expanded low-pressure economizer system to solve the complex structure and control and high investment cost caused by the unit setting up a flue gas heating network heater separately for heating;

[0005] Another object of the present invention is to provide an expanded low-pressure economizer system to solve the problem of dry heating of the flue gas heating network heater in the non-heating season, so as to flexibly meet the demand for combined heat and power in the heating season and the power supply demand in the non-heating season

Images