Cooling water waste heat direct-air cooling type high back pressure-steam extraction integrated heat supply system

Abstract

The invention belongs to the technical field of heat supplying of thermal power plants and particularly relates to a cooling water waste heat direct-air cooling type high back pressure-steam extraction integrated heat supply system. According to the system, the problems that the heat supply distance of a high back pressure low-temperature water direct-supply mode is limited, the loss of water for heating a heat network purely by virtue of steam extraction heating is large are solved. The system comprises an air cooling unit, a first exhaust steam valve, an air cooling island, a second exhaust steam valve, a heat supply condenser, an electric heat pump, a heat network heater, a near-distance heat user, a heat exchange station, an auxiliary engine circulating cooling water outlet pipe, a mechanical draft cooling tower, a hot water valve, an auxiliary engine circulating cooling water return pipe, a heat network adjusting valve, a far-distance heat user, a condensing water valve, a hydrophobic valve and an electric generator. According to the system, the auxiliary engine waste heat is adequately recycled based on a high back pressure heat supply unit, the recycling and gradient utilization of energy in a heat supply process are realized, the economy of the unit is increased, and the purposes of saving energy and reducing consumption are achieved.

Description

technical field [0001] The invention belongs to the technical field of heat supply for thermal power plants, and in particular relates to a direct air cooling high back pressure-extraction combined heat supply system using the waste heat of cooling water. Background technique [0002] With the acceleration of urbanization, the central heating area in the northern region has grown rapidly. As the heat supply center of the city, the thermal power plant plays an extremely important role in the process of urban central heating. In the north of my country, especially in the northwest region, there is rich coal and water shortage, and there is a very large demand for heat in the cold season. Therefore, direct air-cooled heating units have strong functional adaptability in the north of my country. However, my country is currently one of the largest greenhouse gas emitters in the world, and "energy conservation and emission reduction" is an important core of my country's social and ...

AI Technical Summary

Problems solved by technology

At present, in my country's large-scale extraction condensing thermal power units, the temperature of heating and extraction steam is mostly in the temperature range of 200-300°C. There is a large temperature difference in the return water temperature of the network. Directly using heat supply and extraction steam to heat the return water of the heating network will cause great loss, which is not conducive to energy saving and consumption reduction.

The air-cooled high back pressure heating unit adopts the low-temperature water direct supply mode for heating. Although it can avoid the loss caused by the steam extraction heating mode, the water supply temperature of the heating network is between 60°C and 70°C, which is relatively low and the heating distance is limited. , not suitable for long-distance heating

However, in air-cooled cogeneration power plants, the waste heat of auxiliary circulating cooling water is large and low-grade, and is usually discharged directly into the environment through mechanical ventilation cooling towers, resulting in a great waste of energy

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