Two-stage single-effect and double-effect lithium bromide absorption refrigerating unit with smoke and hot water afterburning

Abstract

The invention relates to a two-stage single-effect and double-effect lithium bromide absorption refrigerating unit with smoke and hot water afterburning. The two-stage single-effect and double-effect lithium bromide absorption refrigerating unit with smoke and hot water afterburning comprises a smoke-afterburned high pressure generator (7), an evaporator, an absorber, a steam generator (19), a hot water generator (21), a condenser, a heat exchanger, a solution pump and a coolant pump 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 disposed in one chamber, a heat exchange tube bundle of the steam generator (22) and a heat exchange tube bundle of the double-effect condenser (18) are disposed in another chamber, cooling water flow paths of the single-effect condenser (22) and the double-effect condenser (18) are serially connected, and cooling water enters from the single-effect condenser (22) and comes out of the double-effect condenser (18). Generating pressure of the hot water generator can be lowered, concentration of dilute solution in hot-water single-effect circulation is lowered, and temperature of a waste heat smoke outlet is lowered.

Description

technical field [0001] The invention relates to a lithium bromide absorption refrigeration unit. It belongs to the technical field of air conditioning equipment. Background technique [0002] In the past, the flue gas hot water supplementary combustion single-double-effect compound lithium bromide absorption refrigeration unit such as figure 1 As shown, the unit consists of a flue gas supplementary combustion type high-pressure generator 7, an evaporator 56, an absorber 45, a hot water generator 21, a steam generator 19, a condenser 55, a high-temperature heat exchanger 6, and a low-temperature heat exchanger 5 , a single-effect heat exchanger 24, a double-effect solution pump 31, a single-effect solution pump 32, a refrigerant pump 30, a control system (not shown in the figure) and pipelines and valves connecting various components. Among them, the heat exchange tube bundles of the three components of the hot water generator, the steam generator and the condenser are arra...

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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. The double-effect compound lithium bromide absorption chiller 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, which will lead to a decline in the overall energy utilization rate of the system and low economic benefits ; At the same time, the selection of flue gas supplementary combustion double-effect lithium bromide absorption chiller and hot water single-effect lithium bromide absorption chiller will increase the type and number of equipment configurations, thereby increasing the equipment footprint and investment costs

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