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Absorption Chiller
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 Working principle of steam absorption chiller

Evaporator

Connected to the air conditioning system, the 12 ℃ cold water from the air conditioning system flows inside the heat exchange tube of the evaporator, and exchanges heat with the 4 ℃ refrigerant water sprayed under the vacuum environment outside the tube. The refrigerant water evaporates and absorbs the heat of the cold water in the tube to make the tube inside The cold water cooled to 7 ℃. The refrigerant water absorbs heat and turns into steam, which enters the absorber and is absorbed by the lithium bromide solution.

Absorber
The heat and mass transfer process is performed in the absorber. The concentrated solution is sprayed outside the heat transfer tube of the absorber to absorb the water vapor generated in the evaporator and become a dilute solution to complete the mass transfer process; at the same time, the cooling water is transferring heat The flow in the tube absorbs the solution sprayed out of the tube to reduce the temperature of the solution, keep the absorber at a low pressure, and better absorb the water vapor generated in the evaporator. The diluted solution is pumped to the low temperature-high temperature regenerator for heating and concentration.

Low temperature regenerator
Using the refrigerant steam generated in the high-temperature regenerator as a heating source, the dilute solution entering the low-temperature regenerator is heated and concentrated, and the solution is concentrated into a concentrated solution; the separated refrigerant steam enters the condenser to condense to form refrigerant water, in addition, as a heating The refrigerant vapor of the source is condensed into refrigerant water, enters the condenser, and enters the evaporator together to produce cold water for air conditioning.

High temperature regenerator
About 50% of the dilute solution coming out of the absorber is sent to the high-temperature regenerator for heating by the solution pump, and a large amount of refrigerant vapor is generated to enter the low-temperature regenerator as a heating source, and the dilute solution is concentrated into a concentrated solution. The concentrated solution enters the high-temperature heat exchanger for heat exchange.

High temperature heat exchanger
The concentrated solution from the high-temperature regenerator exchanges heat with the dilute solution from the low-temperature heat exchanger, which not only increases the temperature of the dilute solution entering the high-temperature regenerator, but also reduces the heat consumption required by the high-temperature regenerator; The temperature of the concentrated solution reduces the cooling load of the absorber, so the high temperature heat exchange is also called an energy saver.

Low temperature heat exchanger
The concentrated solution of the high-temperature regenerator is mixed with the remaining about 50% of the concentrated solution flowing out of the low-temperature regenerator. The mixed concentrated solution and the dilute solution from the absorber are exchanged in the low-temperature heat exchange. -The temperature of the dilute solution of the high temperature regenerator reduces the heat consumption required by the low temperature-high temperature regenerator; and further reduces the temperature of the concentrated solution entering the absorber and reduces the cooling load of the absorber. The low temperature heat exchanger is called an energy saver .

Condenser
The cooling water flows in the condenser heat transfer tube and absorbs the heat of the refrigerant steam outside the tube. The refrigerant steam condenses the slight refrigerant water and enters the evaporator. The cooling water absorbs the heat and is transferred to the outdoor environment through the cold zone tower. Complete the process of transferring heat from low-temperature indoor to high-temperature outdoor to achieve the purpose of cooling.

Reference

Country:China
Application: energy saving of epoxy acetylene and ethylene glycol plant / capacity expansion of epoxy acetylene
Product: hot water type chiller
Cooling capacity: 12, 310kW
Cooling water: large circulating water system
Surplus hot water: process hot water

Country:China
Application: thermal power plant
Product: steam type absorption heat pump unit
The project uses 3 34MW steam-type absorption heat pumps, powered by steam turbine extraction, to recover waste steam waste heat, forming a heating capacity of 2 million square meters


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