Combined heat and power generation system for condensing-extracting-backpressure heat supply and operation method thereof

Abstract

The invention relates to a combined heat and power generation system for condensing-extracting-backpressure heat supply and an operation method thereof. A traditional centralized heating mode can cause great available energy loss. In the combined heat and power generation system for condensing-extracting-backpressure heat supply provided by the invention, a boiler, a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder, a steam turbine low-pressure cylinder, an electric generator and a condenser are sequentially connected through a pipeline; a boiler feed pipe is connected between the condenser and the boiler; the condenser, a condensate pump, a low-pressure heater, a feed water heater, a deaerator, a feed pump and a high-pressure heater are sequentially arranged on the boiler feed pipe; a steam inlet of a heat supply network heat exchanger is connected with a communicating pipe between the steam turbine intermediate-pressure cylinder and the steam turbine low-pressure cylinder; and a dewatering outlet is connected with the low-pressure heater. According to the combined heat and power generation system for condensing-extracting-backpressure heat supply and the operation method thereof provided by the invention, the steam turbine intermediate-pressure cylinder is structurally improved, or a secondary intermediate-pressure cylinder is additionallyarranged behind so as to be adapt to switching operation among three working conditions, i.e. pure condensing, steam extracting and backpressure of a turboset. According to the combined heat and powergeneration system for condensing-extracting-backpressure heat supply and the operation method thereof provided by the invention, the original lost energy is converted into high-quality electric energy through the acting of a turbine, so that the gradient utilization of the energy is realized.

Description

technical field [0001] The invention relates to the field of cogeneration of heat and power, in particular to a cogeneration system of heat and power for condensing and pumping back heating and an operation method thereof. Background technique [0002] Fagai Nengli [2016] No. 617 "Notice on Printing and Distributing the "Management Measures for Cogeneration of Heat and Power"" requires: strive to achieve a centralized heat supply rate of more than 60% in cities with a population of more than 200,000. Full coverage. This indicates that the development of combined heat and power will enter a period of rapid development. And as my country's policy gradually attaches importance to the promotion of new energy, the proportion of thermal power units participating in peak regulation has gradually increased, making the units operate at low load for a long time. At present, the traditional central heating method is that the unit heats and extracts steam to be heated in the heat netw...

AI Technical Summary

Problems solved by technology

For the existing heating units or pure condensing reformed heating units, due to the high heating extraction pressure, when the external heat supply increases, the unit’s work capacity loss will gradually increase

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