Cooling water waste heat recycling system

Abstract

The invention discloses a cooling water waste heat recycling system, which comprises a cold water tank, a circulating pump A, a heat production device, a hot water tank, a circulating pump B, a variable frequency pump, a plate type heat exchanger A, a circulating pump C, a small water tank, a heat pump unit, a circulating pump D, a hot water tank, a water supply pump, a plate type heat exchanger B and a cooling tower. The cooling water waste heat recycling system transfers the energy of cooling water to the heat pump by using the plate type heat exchanger A, and then converts the low temperature heat transferred by the plate type heat exchanger into high temperature heat energy by using the heat pump, the water in the hot water tank is used as a carrier of the high temperature heat energy, and the temperature is up to 60 DEG C, so that the use occasions are increased. According to the cooling water waste heat recycling system, the heat supplied to the heat pump is indirectly adjusted by using the plate type heat exchanger A and the variable-frequency pump, so that the temperature of water entering the heat pump of a third internal circulation is stable and is less than 32 DEG C, and the service life of the heat pump as well as the reliability and stability of the waste heat recovery are ensured. The normal temperature water injected in the hot water tank firstly passes through the plate type heat exchanger B, so that the energy consumption in the waste heat recovery process is reduced.

Description

technical field [0001] The invention relates to waste heat recovery technology, in particular to a waste heat recovery system which utilizes a heat pump to recover waste heat of cooling water. Background technique [0002] The energy consumption of industrial production in my country accounts for about 62%-70% of the total energy consumption, and the energy consumption of the cooling water circulation system can account for half of the energy consumption of industrial production. The energy utilization efficiency of industry is only 30%-40%, and about half of the heat is directly discharged into the atmosphere through cooling water, which not only wastes a lot of heat energy, but also causes environmental pollution. Since cooling water is usually at a low temperature, generally lower than 35°C, it is a low-grade heat source, and there are not many occasions where it can be directly used, which brings certain difficulties to waste heat recovery. With the increasing maturity ...

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Problems solved by technology

[0004] The main disadvantage of this system: From the working principle of the heat exchanger, it can be seen that during the heat exchange process of the heat exchanger, the temperature of the circulating water to be heated must be lower than the temperature of the heat source water

If the cooling water in the industry is directly pumped into the heat pump unit, it will often cause the heat pump unit to fail to work normally. Therefore, ensuring the stability of the heat source water temperature of the heat pump is a key point in the cooling water waste heat recovery system.

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