High temperature difference heating system combined with peak shaving boiler and method

Abstract

The invention belongs to the technical field of heat supply energy sources, and discloses a high temperature difference heating system combined with a peak shaving boiler and a method. The high temperature difference heating system is provided with a steam boiler, a turbine, a compression type heat pump, an absorption type heat pump, a steam water heat exchanger, a steam system and a hot water system; and the steam system and the hot water system are connected with the steam boiler, the turbine, the compression type heat pump, the absorption type heat pump and the steam water heat exchanger. With the combination of the compression type heat pump and the absorption type heat pump, deep cooling on the return water temperature of a heating network can be realized, the temperature difference between supply water and the return water of the heating network is increased, the pipe network investment and running cost is reduced, and favorable working conditions are created for recovery of lowtemperature waste heat of a thermoelectric power plant; steam generated by the peak shaving boiler enters the turbine to do work to drive the compression type heat pump, the turbine subjected to pressure reduction exhausts steam to act as a driving heat source of the absorption type heat pump, so that available energy of a boiler heat source is used fully; and the return water of the heating network is sequentially subjected to step cooling by an evaporator of the absorption type heat pump and an evaporator of the compression type heat pump.

Description

technical field [0001] The invention belongs to the technical field of heating energy, and in particular relates to a large temperature difference heating system and method combined with a peak-shaving boiler. Background technique [0002] Centralized heating is mainly used for heating in winter in northern cities in my country, in which thermal power plants are the basic heat source and boilers are the peak heat source. Due to environmental protection requirements, thermal power plants are far away from cities, and long-distance hot water pipe networks need to be built to achieve heat transmission. As the urban heating area continues to increase, the return water temperature of the conventional heating network is high, usually 50°C to 60°C, which brings about two problems: (1) Due to the small temperature difference between the heating network supply and return water, the flow rate is large, It leads to high investment and operation costs of the pipeline network; (2) The r...

AI Technical Summary

Problems solved by technology

As the urban heating area continues to increase, the return water temperature of the conventional heating network is high, usually 50°C to 60°C, which brings about two problems: (1) Due to the small temperature difference between the heating network supply and return water, the flow rate is large, It leads to high investment and operation costs of the pipeline network; (2) The return water of the heating network cannot directly exchange heat with the low-temperature exhaust steam or flue gas of the power plant, and the cost of waste heat recovery is high

[0003] In addition, the use of coal-fired or gas-fired peak-shaving boilers to directly heat the heating network water, due to the extreme mismatch between the energy level of the heat source and the heating network water, results in a large amount of waste of available energy (working capacity), and its energy-saving potential has a lot of room for improvement

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