A system that significantly reduces the temperature of district heating for combined heat and power generation

Abstract

The invention provides a system capable of greatly lowering the combined heat and power generation centralized heating temperature. An absorption type heat exchange unit and a multi-stage electric driving heat pump are introduced and used for conducting multiple times of heat exchange use on a heat source through a power source, the utilization efficiency of the steam heat source is improved, and heat is better supplied to a user. A solar collector is introduced and used for conducting temperature rise on primary net return water through solar energy, namely, clean energy, in an energy-saving and environmentally friendly mode. In addition, a steam double-effect absorption type heat pump, a steam single-effect absorption type heat pump and a steam large-temperature-difference absorption type heat pump are introduced and used for recycling low-grade heat stage by stage, dead steam in a turbine is effectively used, and the utilization efficiency of the energy is improved. The primary net supply water temperature is lowered to be 90 DEG C, the heating steam extraction flow of a thermal power plant is saved, and the power generation capacity of the thermal power plant is increased. Meanwhile, the heating water temperature is lowered, and therefore the consumption of thermal insulation materials is lowered, and the thermal losses of heating pipelines are reduced.

Description

technical field [0001] The invention belongs to the field of combined heat and power heat supply, and in particular relates to a system for greatly reducing the temperature of centralized heat supply for combined heat and power. Background technique [0002] In recent years, with the increase of urban heating area in my country and the construction of industrial plants and production lines, the heat consumption in my country has grown rapidly. From the analysis of heating methods, there are mainly the following heating methods for residents in my country: combined heat and power generation, central heating in small and medium-sized regional boiler rooms, small household gas-fired water heaters, household coal-fired furnaces, etc. Among them, the cogeneration method is a comprehensive energy utilization technology that uses high-grade thermal energy of fuel to generate electricity and then supplies low-grade thermal energy for heating. At present, the average power generatio...

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Problems solved by technology

[0003] Aiming at the problem that a large amount of latent heat of vaporization in the exhaust steam of the steam turbine cannot be fully utilized, and the shortcomings of a large amount of heat loss in the heating pipeline, the present invention provides a system for greatly reducing the central heating temperature of cogeneration

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