Large-temperature-difference cold water composite gradient utilization system based on waste heat utilization

Abstract

The invention discloses a large-temperature-difference cold water composite gradient utilization system based on waste heat utilization. The large-temperature-difference cold water composite gradientutilization system comprises a waste heat absorption type large-temperature-difference gradient refrigeration system, a chilled water gradient utilization system, a cooling water gradient utilizationsystem and a district cooling user system. The waste heat absorption type large-temperature-difference gradient refrigeration system supplies cold water to the chilled water gradient utilization system through a pipeline. The chilled water gradient utilization system supplies cold water to the cooling water gradient utilization system through a pipeline. The cooling water gradient utilization system supplies cold water to the district cooling user system. Hot water of the cooling water gradient utilization system flows back to the waste heat absorption type large-temperature-difference gradient refrigeration system to be cooled. According to the large-temperature-difference cold water composite gradient utilization system, waste heat of a thermal power plant is utilized for carrying out absorption type refrigeration; waste heat and exhaust heat gradient utilization is achieved; the primary energy utilization ratio is increased; the water return temperature is improved; the water supplyand return temperature difference of the district cooling system is increased; the cold water use temperature difference is enlarged; the circulating water amount of cold water is greatly reduced; pipe network conveying energy consumption and cold losses are reduced; and cold water pipe network conveying energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of cooling water cascades and waste heat utilization, in particular to a large temperature difference cold water composite cascade utilization system based on waste heat utilization. Background technique [0002] With the popularization and application of efficient energy utilization technologies such as combined heat and power, combined cooling, heating and power supply, and distributed energy, waste heat utilization technology has been vigorously developed as an important part of efficient energy utilization and cascade utilization. In addition to heat supply, waste heat utilization often uses waste heat steam and flue gas tail gas of thermal power plants as heat sources to drive absorption lithium bromide chillers to produce low-temperature chilled water for cooling. In the prior art, when waste heat utilization is applied to district cooling systems, since common absorption chillers can only produce chil...

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Problems solved by technology

[0003] The method of reducing the temperature of the water supply in series to increase the temperature difference between the supply and return water has the following problems: firstly, the outlet water temperature of the absorption machine is relatively low at 6°C, and there is limited room for reducing the outlet water temperature of the downstream electric refrigeration unit; secondly, the electric refrigeration unit When working in ultra-low temperature conditions, the efficiency drops sharply, and the energy saving effect is poor, which deviates from the goal of energy saving; thirdly, the low temperature chilled water will affect the heat exchange capacity of the user's terminal equipment

However, if the waste heat is transported over a long distance, there will be more energy loss, which is not conducive to transporting the waste heat to an area that is too far away, so the scope of use is limited

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