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

A technology of combined heat and power generation and heat network, which is applied in the direction of steam engine devices, machines/engines, mechanical equipment, etc., can solve the problems of unit working capacity loss, high heating and steam extraction pressure, and increase, so as to reduce the working capacity loss , reduce exhaust parameters, reduce the effect of heat transfer temperature difference

Pending Publication Date: 2018-03-30
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] see Figure 1 to Figure 3 , in this embodiment, a cogeneration system for condensing and pumping back heating, which includes: boiler 1, steam turbine high-pressure cylinder 2, steam turbine medium-pressure cylinder 3, steam turbine low-pressure cylinder 4, generator 5, condensing steam 6, condensate pump 7, low-pressure heater 8, feedwater heater 9, deaerator 10, feedwater pump 11, high-pressure heater 12 and heat network heat exchanger 13; the steam inlet of the high-pressure cylinder 2 of the steam turbine and the boiler The main steam port of 1 is connected, the exhaust port of the high-pressure cylinder 2 of the steam turbine is connected with the reheat steam inlet of boiler 1, the reheat steam outlet of boiler 1 is connected with the steam inlet of the medium-pressure cylinder 3 of the steam turbine, and the medium-pressure cylinder of the steam turbine The steam exhaust port of 3 is connected with the steam inlet of the steam turbine low-pressure cylinder 4 thro...

Embodiment 2

[0036] see figure 1 , The combined heat and power system includes: boiler 1, steam turbine high pressure cylinder 2, steam turbine medium pressure cylinder 3, steam turbine low pressure cylinder 4, generator 5, condenser 6, condensate water pump 7, low heating heater 8, feed water heater 9, Deaerator 10, feed water pump 11, high heating heater 12 and heat network heat exchanger 13; the steam inlet of steam turbine high-pressure cylinder 2 is connected to the main steam port of boiler 1, and the steam exhaust port of steam turbine high-pressure cylinder 2 is connected to boiler 1 The reheat steam inlet of the boiler 1 is connected to the steam inlet of the medium pressure cylinder 3 of the steam turbine, and the exhaust port of the medium pressure cylinder 3 of the steam turbine is connected to the steam inlet of the low pressure cylinder 4 of the steam turbine through the connecting pipe 20 connected, and a steam regulating valve 14 is installed on the communication pipe 20, t...

Embodiment 3

[0040] see figure 2 , The combined heat and power system includes: boiler 1, steam turbine high pressure cylinder 2, steam turbine medium pressure cylinder 3, steam turbine low pressure cylinder 4, generator 5, condenser 6, condensate water pump 7, low heating heater 8, feed water heater 9, Deaerator 10, feed water pump 11, high heating heater 12 and heat network heat exchanger 13; the steam inlet of steam turbine high-pressure cylinder 2 is connected to the main steam port of boiler 1, and the steam exhaust port of steam turbine high-pressure cylinder 2 is connected to boiler 1 The reheat steam inlet of the boiler 1 is connected to the steam inlet of the medium pressure cylinder 3 of the steam turbine, and the exhaust port of the medium pressure cylinder 3 of the steam turbine is connected to the steam inlet of the low pressure cylinder 4 of the steam turbine through the connecting pipe 20 connected, and a steam regulating valve 14 is installed on the communication pipe 20, ...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K13/00F01K13/02F01K21/00F01D15/10
CPCF01D15/10F01K13/00F01K13/02F01K21/00
Inventor 孙士恩高新勇庄荣俞聪何晓红郑立军王伟陈菁王启业
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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