Compound absorption refrigeration unit

Abstract

The invention discloses a compound absorption refrigeration unit. The compound absorption refrigeration unit comprises at least two module units, wherein each module unit comprises a low-pressure generator, a high-pressure generator, a hot water generator, an absorber and an evaporator, and each module unit can be configured to have the following working modes: a double-effect working mode that high-quality heat sources carry out heat exchange, a single-effect working mode that waste heat water carries out heat exchange, and a single-double-effect working mode that two heat sources carry out heat exchange simultaneously; and in this way, the different module units in a whole unit can be configured to have different working modes according to the different types and the different heat exchange amounts of the drive heat sources, so that the maximum recovery for waste heat under many conditions that waste heat water is insufficient or the high-grade heat sources are not supplemented or replaced in time can be met, and the maximum refrigeration capacity need is met. Moreover, an outlet concentration of each absorber can be reduced by virtue of the cycle of two or more module units, then a steam drive pressure is reduced, and a smoke discharge temperature of a natural gas outlet or a smoke outlet can be reduced, so that the effects of energy saving and effect improvement are acted.

Description

technical field [0001] The invention relates to the technical field of energy recovery, in particular to a composite absorption refrigeration unit. Background technique [0002] At present, processes such as EO basin liquid cooling in the petrochemical industry, carbon dioxide removal in the petrochemical industry, and primary cooler cooling in coking plants need to provide cooling capacity for cooling all year round. These fields generally have waste water and high-grade heat sources. Therefore, in order to improve the utilization rate of waste heat, double-effect machines and single-effect machines are often installed at this stage to recover heat from high-grade heat sources and waste water. [0003] The double-effect machine mainly includes an evaporator, an absorber, a condenser, a low-pressure generator and a high-pressure generator. The driving heat source of the double-effect machine is a high-grade heat source. The refrigerant evaporates inside the evaporator, coo...

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Problems solved by technology

[0005] It can be seen from the above description that when there is only high-grade heat source or waste water in the use environment, only one of the double-effect unit or single-effect unit can operate, and the other is in a non-working state, so that the evaporator and absorber in the unit The heat exchange area of ​​the device cannot be fully utilized, and the cooling capacity is low, which cannot meet the needs of users

Moreover, the single-stage circulation of the waste water in the single-effect unit cannot realize the utilization of large temperature differences

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