JPS5828902B2 - Steam↓-exhaust gas switching type absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steam-exhaust gas switching type absorption refrigerator using water as a refrigerant and a salt solution as an absorbent. The purpose is to perform economical driving.

For example, if you are installing an absorption chiller that uses exhaust gas as a heating source to produce chilled water for use in air conditioning, etc., or if some factory processes emit exhaust gas for several hours a day,
Also, depending on the day, there are times when exhaust gas is emitted and times when it is not.

In all of these cases, a separate auxiliary heat source is required.

On the other hand, in factory processes, in addition to exhaust gas, steam from the boiler can be obtained relatively easily, so when the supply of exhaust gas is stopped, this steam can be effectively utilized to reduce the operating cost of the absorption chiller.

The present invention has been made in view of the above points, and an embodiment shown in the drawings will be described below.

1 is a high temperature generator for exhaust gas that is equipped with a large number of flue gas smoke pipes 2, 2, etc. and heats and separates the refrigerant from the dilute liquid; 3 is an intermediate generator that uses the refrigerant vapor sent from the high temperature generator 1 as a heating source; A low temperature generator reheats the liquid and further separates the refrigerant; 4 is a condenser that cools and liquefies the refrigerant flowing from the circular generators 1 and 3 in a cooler 5; 6 is a condenser that liquefies the liquid refrigerant from the condenser 4; The evaporator 8 is designed to obtain cold water for cooling from the water cooler 7 by utilizing the latent heat generated during spraying and vaporization. Absorbers 9 and 10, which maintain the inside of the evaporator 6 at a low pressure by absorbing refrigerant vapor and enable a continuous supply of cold water, exchange heat between the concentrated liquid and the dilute liquid, and between the concentrated liquid and the intermediate liquid, respectively. The low-temperature heat exchanger and the high-temperature heat exchanger include a refrigerant vapor pipe 11, a refrigerant liquid downflow pipe 12, a refrigerant circuit 14 with a refrigerant pump 13, a dilute liquid pipe 16 with an absorption liquid pump 15, and an intermediate liquid pipe 11.
and are connected by a concentrated liquid pipe line 18 to constitute a refrigeration cycle.

Reference numeral 19 denotes a cooling water circulation path for cooling the condenser 4 and absorber 8, and the circulation path includes a radiator 2 attached to the high temperature generator 1 for exhaust gas.
0, a cooling tower 21 and a cooling water pump 22 are provided.

Reference numeral 23 is a high-temperature steam generator that is equipped with a steam heating pipe 24 and heats and separates the refrigerant from the replacement fluid.The generator includes a refrigerant pipe 28, a replacement fluid pipe 29, and The intermediate liquid pipe 30 is connected to the refrigerant vapor pipe 11, the replacement liquid pipe line 16, and the intermediate liquid pipe line 17 of the refrigeration cycle so as to be in parallel with the high temperature generator 1 for exhaust gas.

31, 32, and 33 are the refrigerant vapor pipe 11 and the replacement fluid pipe 16.
and an automatic switching on/off valve provided in the intermediate liquid pipe line 17.

Next, the operation in the above configuration will be explained.

b) When using a high-temperature generator for exhaust gas In this case, the automatic switching valves 25, 26, and 27 on the high-temperature steam generator 23 side are all closed, and the automatic switching valves on the high-temperature generator 1 side for exhaust gas are closed. 31, 32, and 33 are all open.

When the temperature of the chilled water obtained from the water cooler T of the evaporator 6 reaches a set value, the temperature controllers 36 and 37 are actuated by detection by the temperature detectors 34 and 35, respectively, to throttle the refrigerant vapor control valve 38 and reduce the temperature of the refrigerant liquid. The control valve 39 is opened to radiate the heat of the exhaust gas high temperature generator 1 to the radiator 20 of the cooling water circulation path 19, and the operation of the refrigerant pump 13 is stopped to perform capacity control.

When using a high-temperature generator for steam In this case, the automatic switching valves 25, 26, and 27 on the high-temperature steam generator 23 side are all open, and the automatic switching valves 25, 26, and 27 on the high-temperature generator 1 side for exhaust gas are open. 31, 32, and 33 are all closed.

When the temperature of the cold water obtained from the water cooler 1 of the evaporator 6 reaches a set value, the temperature controllers 36 and 37 are activated by detection by the temperature detectors 34 and 35, respectively, and the refrigerant vapor control valve 38 and the vapor control valve 40 are activated. At the same time, the operation of the refrigerant pump 13 is stopped to perform capacity control.

As described above, the steam-exhaust gas switching type absorption refrigerating machine according to the present invention uses water as a refrigerant and a salt solution as an absorbent, and has a high temperature generator for exhaust gas, a low temperature generator, a condenser, an evaporator, an absorber, and a heat exchanger for low temperature. A high-temperature heat exchanger is connected via piping to form a refrigeration cycle, and a high-temperature generator for steam is connected in parallel with the high-temperature generator for exhaust gas via a switching valve, and the high-temperature generator Since one of these is selectively used, it is possible to operate economically at low cost depending on the exhaust gas and steam in the factory process without requiring a separate boiler as an auxiliary heat source.

-! The heating source can also be easily switched.

Furthermore, when a high-temperature generator for exhaust gas is used, the opening degree of the flow rate control valve for the refrigerant liquid that flows back from the radiator to the high-temperature generator for exhaust gas is adjusted via a temperature controller based on the signal from the chilled water temperature detector. As a result, it is possible to supply chilled water according to the load, and it also eliminates the need to adjust the flow rate of exhaust gas supplied to the absorption chiller, which is a practical solution that does not adversely affect the operation of the factory process side. It has the desired effect.

If the switching valve is operated in an interlock circuit with the process that generates exhaust gas, the absorption chiller can be operated with steam when the process is operated and not with exhaust gas.

[Brief explanation of drawings]

The drawing is a circuit diagram of the absorption refrigerator of the present invention. 1... High temperature generator for exhaust gas, 23... High temperature generator for steam, 25.26.27.31.32.33... Automatic switching on/off valve, 20... Heat radiator, 34... Temperature detector, 36... Temperature regulator, 39... Refrigerant liquid control valve.

Claims (1)

[Claims] 1 A refrigeration cycle is constructed by using water as a refrigerant and a salt solution as an absorbent, and connecting a high-temperature generator for exhaust gas, a low-temperature generator, a condenser, an evaporator, an absorber, a low-temperature heat exchanger, and a high-temperature heat exchanger with piping. At the same time, a high-temperature generator for steam is connected in parallel with the high-temperature generator for exhaust gas through a switching valve, one of the high-temperature generators is selectively used depending on the heating source, and the cooling water is connected to the absorber. When the high-temperature generator for exhaust gas is used, the signal from the chilled water temperature detector is used to flow the water to the radiator attached to the high-temperature generator for exhaust gas via the condenser. 1. A steam-exhaust gas switching type absorption refrigerating machine, characterized in that the opening degree of a flow rate control valve for refrigerant liquid flowing back from the refrigerant liquid back to the exhaust gas high-temperature generator is adjusted.