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 cascade utilization system based on waste heat utilization, including a waste heat absorption type large temperature difference cascade refrigeration system, a chilled water cascade utilization system, a cooling water cascade utilization system, and a regional cooling user system, waste heat absorption type large temperature difference The cascade refrigeration system supplies cold water to the chilled water cascade utilization system through pipelines, the chilled water cascade utilization system supplies cold water to the cooling water cascade utilization system through pipelines, the cooling water cascade utilization system supplies cold water to the regional cooling user system, and the cooling water cascade utilization The hot water in the system flows back to the waste heat absorption type large temperature difference cascade refrigeration system for cooling. The invention utilizes waste heat from thermal power plants to perform absorption refrigeration, realizes waste heat and waste heat cascade utilization, improves primary energy utilization, increases return water temperature, increases supply and return water temperature difference in regional cooling systems, expands cold water use temperature difference, and greatly reduces cold water circulating water volume. Reduce the energy consumption and cooling loss of pipe network transportation, and reduce the energy consumption of cold water pipe network transportation.

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 temper

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