A central heating system with low temperature return water

Abstract

The invention discloses a low-temperature return water central heating system belonging to the field of central heating. The technical solution is to set up heat pump heat exchange units in each thermal station of the heat network to reduce the return water temperature of the primary network hot water, and first introduce the low-temperature primary network return water into the condenser in the power plant, and use the steam turbine exhaust Steam heating. The main features of the present invention are reflected in two aspects: first, a heat pump type heat exchange unit is installed in the heating network thermal station, which further reduces the return water temperature of the primary network compared with the conventional centralized heating mode, so that the hot water supply of the primary network 1. The temperature difference of the return water is further increased, which improves the transmission capacity of the heat network, and the low-temperature return water provides the possibility of recovering the exhaust heat of the steam turbine in the power plant; The heat supply capacity of the power plant is improved by reducing the exhaust heat of the steam turbine.

Description

technical field [0001] The invention belongs to the field of central heating, and relates to a central heating system with low-temperature return water. Background technique [0002] With the continuous development of the city scale, the urban central heating area continues to increase, which has brought about two problems: one is the insufficient capacity of the central heating source, and the new large-scale heat source has high investment, long construction period, and is affected by the environment. The capacity is strongly restricted. Some places blindly develop small coal-fired boiler rooms, which brings serious pollution to the atmosphere. Some places blindly develop gas heating or even electric heating. Second, the high-temperature hot water generated by the heat source often needs to be transported over a long distance before reaching the end user. Due to the limitation of heat requirements, the return water temperature can no longer be lowered by using conventiona...

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Problems solved by technology

[0004] In view of the above problems, the present invention proposes a centralized heating method that can effectively reduce the return water temperature of the heating network and use the exhaust heat of the steam turbine to heat the hot water of the primary network in the power plant, which can not only alleviate the problem of insufficient heat source capacity of the central heating It can also greatly improve the transmission capacity of the heating network and reduce the energy consumption of transmission

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