Two-section flue gas hot-water single/double-effect composite lithium bromide absorption type refrigerating unit

Abstract

The invention relates to a two-section flue gas hot-water single/double-effect composite lithium bromide absorption type refrigerating unit which comprises a flue gas type high-pressure generator (7), an evaporator, an absorber, a steam generator (19), a hot-water generator (21) and a condenser, and is characterized in that the condenser comprises a single-effect condenser (22) and a double-effect condenser (18); a heat exchange tube bundle of the hot-water generator (21) and a heat exchange tube bundle of the single-effect condenser (22) are arranged in a cavity; a heat exchange tube bundle of the steam generator (19) and a heat exchange tube bundle of the double-effect condenser (18) are arranged in another cavity; the cooling water process of the single-effect condenser (22) and the double-effect condenser (18) is a series process; and cooling water flows into the single-effect condenser (22) and flows out of the double-effect condenser (18). According to the two-section flue gas hot-water single/double-effect composite lithium bromide absorption type refrigerating unit, the generation pressure of the hot-water generator can be reduced, the dilute solution concentration of a hot-water single-effect cycle is reduced, and the waste heat flue gas outlet temperature is reduced.

Description

technical field [0001] The invention relates to a lithium bromide absorption refrigerator. It belongs to the technical field of air conditioning equipment. Background technique [0002] The previous flue gas hot water single and double effect compound lithium bromide absorption refrigeration units such as figure 1 As shown, the unit consists of a flue gas type high-pressure generator 7, an evaporator 48, an absorber 37, a hot water generator 21, a steam generator 19, a condenser 47, a high-temperature heat exchanger 6, a low-temperature heat exchanger 5, a single Effect heat exchanger 24, double-effect solution pump 31, single-effect solution pump 32, refrigerant pump 30, control system (not shown in the figure), pipelines and valves connecting various components. Among them, the heat exchange tube bundles of the hot water generator, the steam generator and the condenser are set in the same chamber, that is, the cylinder 20, to form a composite low-heat condenser; the solu...

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Problems solved by technology

However, since the heat exchange tube bundles of the hot water generator, steam generator and condenser of the unit are arranged in the same chamber, the generation pressure of the hot water generator is relatively high (the same as that of the steam generator), and due to The single-effect refrigeration cycle and the double-effect refrigeration cycle share the same absorber, and the concentration of the dilute solution of the hot water single-effect cycle is higher (same as the concentration of the dilute solution of the flue gas double-effect cycle), which makes the temperature of the hot water generator higher. Under normal cooling water inlet temperature (such as about 32°C) and cold water outlet temperature (such as about 7°C) cooling operation, the hot water outlet temperature can only be reduced to about 85°C

In addition, the outlet temperature of the waste heat flue gas of this unit is relatively high (about 170°C when cooling, and about 140°C when heating), which fails to make full use of the waste heat of the flue gas for cooling and heating

At present, among the mainstream gas-fired internal combustion engine generator sets configured in distributed energy systems, some models have lower requirements for high-temperature cooling water return water temperature, and some must be lower than 75°C. If the previous flue gas hot water single-effect The composite lithium bromide absorption refrigeration unit cannot make full use of the high-temperature cooling water for cooling, and the system needs to be equipped with cooling equipment for secondary cooling of the high-temperature cooling water. Equipped with flue gas double-effect lithium bromide absorption chillers and hot water single-effect lithium bromide absorption chillers will increase the types and number of equipment configurations, thereby increasing equipment footprint and investment costs

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