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Steam energy cascade heat recovery utilization system for operation under full working conditions and working method

A full working condition, steam technology, applied in the direction of steam application, heating system, machine operation mode, etc., can solve the problems of low operating hours, affecting the economic benefits of the system, and not fully exploiting the potential, so as to reduce coal consumption and plant The effect of improving the power consumption rate, realizing the utilization of cascade heat recovery, and increasing the number of operating hours

Pending Publication Date: 2018-09-21
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with this system is that the entire system invested, including the back pressure steam turbine and absorption heat pump, can only be used in the heating season, and the operating hours throughout the year are relatively low, which greatly affects the economic benefits of the system and does not give full play to its potential. own potential

Method used

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  • Steam energy cascade heat recovery utilization system for operation under full working conditions and working method

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Embodiment Construction

[0017] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0018] like figure 1 As shown, this embodiment is a steam energy cascade heat recovery utilization system operating under all working conditions. The steam extracted from the medium and low pressure connecting pipe of the thermal power unit enters the back pressure steam turbine 1 to recover high-grade energy, and drives the generator to generate electricity through the coupling, and the generated energy is directly incorporated into the power system of the power plant. The exhaust steam from the back pressure steam turbine 1 is adjusted by the desuperheater 5 to meet the driving steam parameter requirements of the absorption heat pump 3, and then enters the absorption heat pump 3, and drives the absorption heat pump 3 to recover the heat of the low-grade heat source 4 for external supply. hot. During the heating season, the heat supplied by t...

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Abstract

The invention relates to a steam energy cascade heat recovery utilization system for operation under full working conditions and a working method. The system and the working method are mainly appliedto a heat supply unit. The system comprises a back pressure steam turbine, an absorption type heat pump and an air heater; a main steam turbine pumps air and supplies heat through a medium and low pressure communication pipe, and an air inlet of the back pressure turbine is connected to a heat-supplying and air-pumping pipe of the main steam turbine; heat supplying steam is used for driving the steam turbines to rotate, so that a power generator is driven to generate electricity, high-grade energy of the steam is recovered, and the generated electricity is incorporated into a plant power system; an exhausting drive absorption type heat pump of the back pressure turbine recovers low-grade waste heat. During a heating season, the absorption heat pump heats net water to supply heat to the outside; during a non-heating season, through switching of a three-way valve, the absorption type heat pump is used for heating air entering a boiler to achieve heat recovery. By adopting the system, operation of the back pressure steam turbine under the full working conditions and cascade use of the steam are achieved, coal consumption and a plant power consumption rate are decreased, and the economic performance of the unit is improved.

Description

technical field [0001] The present invention relates to the technical field of back pressure machine and heat supply, in particular, the present invention particularly relates to a steam energy cascade heat recovery utilization system and working method operating under all working conditions. Background technique [0002] my country's energy utilization efficiency is low, which seriously restricts my country's economic development and social progress. In the face of the country's major strategic needs for energy conservation and emission reduction, it is imperative to develop new technologies for efficient energy utilization and low emissions. In combined heat and power units, in order to improve energy utilization and realize cascaded utilization of energy, the main steam turbine is generally used to extract steam for heat supply. However, as the operating parameters of the main steam turbine are getting higher and higher, the temperature of the main steam turbine for heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K17/02F01K7/38F24D3/18F23L15/04F25B27/02
CPCF01K7/38F01K17/025F23L15/04F24D3/18F25B27/02Y02A30/274Y02E20/34
Inventor 李启明陈锋张学海钟迪周贤黄中王保民
Owner HUANENG CLEAN ENERGY RES INST
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