City central heat supply method

Abstract

The invention relates to a method for urban central heating, in particular to a method for reusing the return water of the primary line of the heat exchanger of a thermal station for indirect heating in a central heating system. The technical scheme is as follows: the heat source power plant is connected to the indirect heating power station through a pipe network, which is characterized in that the primary line return water of the heat exchanger (22) of the indirect heating power station is introduced into the direct heating system, and the direct heating system is sent to the direct heating system. After the user provides heat, the return water returns to the heat source power plant through the pipe network. Since the temperature of the return water of the primary line of the heat exchanger is higher than the temperature of the water supply of the secondary line, the hot water with such a high temperature can fully meet the needs of direct heating. By developing a new heat source, the original heating pipe network can reduce the water intake points, increase the pressure difference between the supply and return water at the end of the pipe network, and reduce the circulation and heat loss; for the central heating system, it can also be expanded under the condition of saturation. Heating area; save energy and reduce consumption, make full use of thermal energy, reduce unnecessary circulation and waste of high-temperature hot water in the heating pipe network, reduce operating costs, and benefit the country and the people.

Description

Technical field: [0001] The invention relates to a method for central heating in cities, in particular to a method for reusing the return water of a heat exchanger in a heat station for indirect heating in a central heating system for heat supply. Background technique: [0002] At present, urban central heating is generally composed of heat source power plants, main line water supply and return pipe network, branch main line water supply and return pipe network, branch line water supply and return pipe network, heat station, garden water supply pipe, and heat supply users; An important part of the thermal system, the heat source hot water entering and exiting the thermal station is called the primary line supply and return water, and the water in and out of the thermal station supplied to the user is called the secondary line supply and return water. According to the heating mode, the thermal station is divided into direct heating thermal station, direct mixed water heating ...

AI Technical Summary

Problems solved by technology

According to the heating mode, the thermal station is divided into direct heating thermal station, direct mixed water heating thermal station and indirect heating thermal station. The direct heating thermal station is that the hot water of the heat source power plant is directly delivered to the user by the thermal station through the pipe network; The direct mixed water heating station is equipped with a mixing water pump, which mixes the return water into the water supply pipe to increase the flow rate; the indirect heating station is a heat exchanger through which hot water from the heat source power plant enters the heat station through the pipe network (also known as heat exchanger). Exchanger) to exchange heat with the circulating water supplied to the user by the thermal station, the hot water after heat exchange returns to the heat source power plant, the primary line supply and return water (the hot water of the heat source power plant enters the heat power station through the pipe network) and the secondary The supply and return water of the secondary line (supply and return water supplied to the user) does not contact and mix, each is an independent circulation system, and only performs heat exchange through a heat exchanger, only the temperature of the return water of the primary line must be higher than the temperature of the water supply of the secondary line In order to ensure the heat exchange, it is generally 5-7 ℃ higher. The hot water at such a high temperature is not reused, and it is directly returned to the heat source power plant through the pipe network, which actually causes a lot of waste and loss, and increases the transportation cost. In the process of transportation, there is still heat loss, waste of energy, increased heating cost, low utilization efficiency of hot water heat, and corresponding heating area is also reduced

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