KR20060128626A - Operating method of single or double effect absorption refrigerator - Google Patents

Abstract

An operating method of a single or double effect absorption refrigerator is provided to decrease the range of fluctuation in the temperature of cool water supplied with a heat load by selecting the lower valve opening degree to control the thermal power. A single or double effect absorption refrigerator comprises an evaporator(1) and absorber body(3) containing the evaporator(1) and the absorber(2); a low temperature regenerator compressor body(8) containing a low temperature regenerator(6) and a compressor(7); a low heat source regenerator compressor body(11) containing a low heat source regenerator(9) having a warm backwater from other equipment as a heat source and a compressor(10); a high temperature regenerator(5) equipped with a burner(4) for heating absorption water; a low and a high temperature heat exchangers(12,13); a coolant pump(P3), an absorption water pump(26). An operating method of a single or double effect absorption refrigerator compares the valve opening degree of a fuel control valve controlling the amount of the fuel supplied from the burner and the valve opening degree computed by the proportional operation having the outlet temperature of the cool water discharged from the evaporator after being cooled by the coolant evaporated from the evaporator as a variable and the valve opening degree computed by PID(Proportional Integral Derivative) operation having the outlet temperature of cool water as a variable, selects the lowest opening degree and controls the thermal power of the burner.

Description

Operating Method of Single or Double Effect Absorption Refrigerator {Operating Method of Single or Double Effect Absorption Refrigerator}

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the structure of the absorption refrigerator of this invention.

2 is an explanatory diagram showing a valve opening degree determination method of a fuel control valve;

3 is an explanatory diagram showing a control method of an on / off valve interposed in a fuel supply pipe;

4 is an explanatory diagram showing a control method of an intermediate absorbent liquid pump;

5 is an explanatory diagram showing another control method of the intermediate absorbent liquid pump.

6 is an explanatory diagram showing a prior art;

<Explanation of symbols for the main parts of the drawings>

1: evaporator

2: absorber

3: evaporator absorber body

4: gas burner

5: high temperature regenerator

6: low temperature regenerator

7: condenser

8: low temperature regenerator condenser body

9: low heat source regenerator

10: condenser

11: low heat source regenerator condenser body

12: low temperature heat exchanger

13: high temperature heat exchanger

14: cold / hot water pipe

15: cooling water pipe

16: low heat source supply pipe

17: fuel supply pipe

21 to 26 absorber tube

31 to 35: refrigerant pipe

C: controller

P1: Rare Absorbent Pump

P2: Medium Absorbent Pump

P3: Refrigerant Pump

S1: temperature sensor

V1: 3-way valve

V2: Fuel Control Valve

V3 to V7: on-off valve

100, 100X: Absorption Chiller

[Document 1] Japanese Unexamined Patent Publication No. 6-341729

The present invention relates to a method for operating a single double effect absorption chiller (including an absorption cold / hot water machine).

As this kind of absorption refrigerator, for example, as shown in FIG. 6, a high temperature regenerator 5 for heating the absorption liquid by evaporating and separating the refrigerant by using the heat of combustion generated by the gas burner 4 as a heat source, and the high temperature regenerator 5 The refrigerant vapor supplied from the low temperature regenerator 6 and the low temperature regenerator 6 of the dual-effect regenerator for heating the absorption liquid by evaporating and separating the refrigerant, and the refrigerant vapor supplied from the low temperature regenerator 6 are supplied. The refrigerant is heated by heating the absorption liquid using a relatively low temperature warm water, for example, about 80 ° C., supplied from the condenser 7, the cogeneration device, or the like of the dual effect condenser to be condensed, via a low heat source supply pipe 16. The single-effect condenser which is installed in the low heat source regenerator 9 of the single-effect regenerator for evaporating separation and the low heat source regenerator 9 and condenses the refrigerant vapor supplied from the low heat source regenerator 9. The evaporator 1 for evaporating the refrigerant liquid supplied from the condenser 10, the condenser 7 and the condenser 10, and the refrigerant vapor evaporated from the evaporator 1 are absorbed by the concentrated absorbent liquid supplied from the low temperature regenerator 6. A dual-use absorption chiller 100X having an absorber 2, a rare absorbent liquid pump P1, an intermediate absorbent liquid pump P2, a refrigerant pump P3, and the like is known (for example, a patent). See Document 1).

In the drawing, reference numeral 3 denotes an evaporator absorber main body accommodating the evaporator 1 and the absorber 2, 8 a low temperature regenerator condenser body accommodating the low temperature regenerator 6 and the condenser 7, and 11 a low heat source regenerator 9 And a low heat source regenerator condenser body storing the condenser 10, 12 is a low temperature heat exchanger, 13 is a high temperature heat exchanger, 14 is cold water or hot water for circulating supply of cold or warm heat to a heat load (not shown). Is a cold / hot water pipe flowing inside, 15 is a cooling water pipe.

In the absorption chiller 100X having the above-described configuration, the overall energy saving effect is obtained by preferentially using the warm water supplied to the low heat source regenerator 9 via the low heat source supply pipe 16 from another facility such as a cogeneration device (not shown). It is expected to raise.

Therefore, when the evaporator outlet temperature of the cold water cooled by the evaporator 1 and circulated to the heat load through the cold / hot water pipe 14 falls below the set temperature, the fuel supply to the gas burner 4 is stopped and the low heat source Only the warm water supplied through the supply pipe 16 was operated as a heat source.

[Patent Document 1] Japanese Unexamined Patent Publication No. 6-341729

However, in the above conventional control method, the use of exhaust heat supplied from other equipment such as a cogeneration device can be preferentially used, but combustion may be stopped at once from high combustion, and the evaporator outlet temperature of the cold water supplied to the heat load is large. There was a risk of putting.

Therefore, although the use of the hot water is preferentially possible to enable energy saving operation, it is necessary to make sure that the outlet temperature of the cold water circulated and supplied to the heat load is not greatly changed, and the solution has been a problem.

Evaporator absorber body with evaporator and absorber, Low temperature regenerator condenser body with low temperature regenerator and condenser A fuel control valve for adjusting the amount of fuel to be supplied to the burner in the single double effect absorption chiller configured by pipe connection of a high temperature regenerator having a burner, a low temperature heat exchanger, a high temperature heat exchanger, a refrigerant pump, and an absorbent liquid pump. The valve opening degree of the valve is obtained by proportional calculation that takes the heat of the refrigerant evaporated from the evaporator, the temperature of the cold water discharged from the evaporator as a variable, and the PID operation that uses the outlet temperature of the cold water as a variable. By comparing the valve opening degree obtained by To a refrigerator according to the main feature of controlling.

Evaporator absorber body with evaporator and absorber, Low temperature regenerator condenser body with low temperature regenerator and condenser A fuel control valve for adjusting the amount of fuel to be supplied to the burner in the single double effect absorption chiller configured by pipe connection of a high temperature regenerator having a burner, a low temperature heat exchanger, a high temperature heat exchanger, a refrigerant pump, and an absorbent liquid pump. The valve opening degree of the valve is obtained by proportional calculation that takes the heat of the refrigerant evaporated from the evaporator, the temperature of the cold water discharged from the evaporator as a variable, and the PID operation that uses the outlet temperature of the cold water as a variable. By comparing the valve opening degree obtained by The valve opening operation of the fuel control valve is limited to when the opening degree of the valve controlling the flow rate of the hot water supplied from other equipment is 100% of full opening, and after the full closing operation of the fuel control valve. With the decrease in the temperature of the high temperature regenerator or the passage of time, the circulation supply amount of the absorbing liquid to the high temperature regenerator was reduced.

(First embodiment)

Hereinafter, an embodiment of the present invention will be described in detail with reference to Figs. In addition, in these figures, in order to make understanding easy, the part which has the same function as the part demonstrated in FIG. 6 is attached | subjected with the same code | symbol, and description is abbreviate | omitted in the range which does not prevent an understanding.

The absorption chiller 100 of the present invention illustrated in FIG. 1 is a dual-use absorption cold / hot water machine using water as a refrigerant and a lithium embrittlement (LiBr) aqueous solution as an absorption liquid, and accommodates an evaporator (1) and an absorber (2). High temperature regenerator (5), low temperature regenerator (6), condenser (7) and low temperature regenerator (6) provided with one evaporator absorber main body (3) and gas burner (4) as absorbing liquid heating means. And a low heat source regenerator (9), a low heat source regenerator (9), a low heat source regenerator (9), a low heat source regenerator (9), and a low heat source (9). Low heat source regenerator body 11, low temperature heat exchanger 12, high temperature heat exchanger 13, rare water pump P1, intermediate absorbent pump P2, refrigerant containing the regenerator 9 and condenser 10 A pump P3, a three-way valve V1, a fuel control valve V2, opening / closing valves V3 to V7, and the like are provided. Such as through the liquid pipe (21 to 26), the refrigerant pipe (31 to 35) is connected to the pipe. In addition, reference numeral 14 denotes a cold / hot water pipe for circulating and supplying cold water or hot water to a heat load (not shown), 15 is a cooling water pipe, 16 is a low heat source supply pipe, 17 is a fuel supply pipe, 18 is a pressure equalizing pipe, and C is a controller.

In the cooling operation such as cooling the absorption refrigerator 100 having the above configuration, the temperature of the outlet side of the cold water evaporator 1 that is circulated and supplied to the heat load (not shown) via the cold / hot water pipe 14, that is, the refrigerant pump ( When the refrigerant liquid nutrient-formed by P3 and sprayed on the heat pipe 1B from the spreader 1A flows in the heat pipe 1B by the vaporization heat at the time of evaporation, it is cooled, discharged from the evaporator 1, and discharged from the temperature sensor ( The amount of heat supplied to the absorption refrigerator 100 so that the evaporator outlet temperature t of the cold water measured by S1) becomes a predetermined set temperature, for example, 7 ° C, is controlled by the controller C.

Specifically, for example, in the memory unit (not shown) of the controller C, the opening temperature of the fuel control valve V2 of the gas burner 4 is illustrated in Fig. 2, and the outlet temperature t of the cold water is shown. Is first calculated and calculated in two different ways, the control program for selecting and adjusting a small opening degree, and the gas is burned in the gas burner 4 so that the absorbent liquid is heated in the high temperature regenerator 5. At this time, the opening degree of the low heat source regenerator 9 side of the three-way valve V1 of the low heat source supply pipe 16 (the flow rate ratio with respect to the maximum flow rate of the hot and cold water flowing through the low heat source supply pipe 16 to the low heat source regenerator 9 side). . Hereafter, simply referred to as the opening degree of the three-way valve V1] at 100%, that is, when the gas burner 4 is not burned and the gas is burned, the outlet temperature t of the cold water as a variable is conventional. A program for controlling by known PID control is stored.

The memory section of the controller C further includes an on-off valve located upstream of the fuel control valve V2 of the fuel supply pipe 17 connected to the gas burner 4 based on the outlet temperature t of the cold water. A control program for controlling the opening and closing of V3 as shown in Fig. 3 is also stored.

Therefore, in the cooling operation such as cooling, in which cold water cooled by the evaporator 1 is circulated and supplied to the heat load through the cold / hot water pipe 14, by a control program stored in the memory unit of the controller C. The valve opening degree of the fuel control valve V2 is 100% when Vp = Vpid = 100% when the temperature t of the outlet side of the evaporator 1 of cold water measured by the temperature sensor S1 is higher than 8 ° C. That is, it is adjusted to full opening, and when the outlet temperature t of the said cold water is lower than 8 degreeC, and it is higher than 7 degreeC of setting temperature, since PIDpid <Vp = 100%, PID which makes the outlet temperature t of the said cold water a variable Adjust the valve opening degree (Vpid) calculated by the calculation method, and when the outlet temperature (t) of the cold water is lower than 7 ° C of the set temperature and higher than 6 ° C, the outlet temperature (t) of the cold water is used as a variable. The valve opening degree Vp calculated by the proportional calculation method, and By comparing the valve opening degree Vpid calculated by the PID calculation method using the number outlet temperature t as a variable, the valve opening degree of the fuel control valve V2 is adjusted to the smaller valve opening degree, When the outlet temperature t of the cold water is lower than 6 ° C., since Vp = Vpid = 0%, it is 0%, that is, it is closed completely, and the on-off valve V3 is also closed.

In addition, the control program stored in the controller (C) is the three-way valve only when the temperature of the hot water supplied to the low heat source regenerator 9 via the low heat source supply pipe 16 exceeds a predetermined temperature, for example, 85 ° C. The valve opening degree control of (V1) is performed, and it is comprised so that the absorption liquid by the warm water drainage in the low heat source regenerator 9 may be heated.

In addition, the program can be used to determine the temperature of the hot water flowing through the low heat source regenerator 9 and the three-way valve V1 so that the temperature of the hot water returned to the low heat source regenerator 9 does not lower to a predetermined temperature, for example, 70 ° C. or lower. It is configured to limit the amount.

Accordingly, the cooling operation is started while the cooling water flows to the cooling water pipe 15 in a state in which the hot water having a temperature higher than a predetermined temperature of 85 ° C. is supplied via the low heat source supply pipe 16, and the thermal load is large, so that the temperature sensor S1 When the outlet temperature t of the cold water measured by the controller is higher than, for example, 8 ° C, the opening and closing valve V3 interposed in the fuel supply pipe 17 is opened by the controller C, and the fuel control valve V2 is Since the valve opening degree is adjusted to 100%, i.e., full opening, and combustion of gas by the gas burner 4 is performed, the three-way valve V1 is also adjusted to full opening with 100% valve opening, and the absorption chiller The maximum amount of heat during normal operation is put into the 100.

That is, in this state, the absorbent liquid in the high temperature regenerator 5 is heated by the gas burner 4, and the absorbent liquid in the low heat source regenerator 9 is heated by the warm water supplied through the low heat source supply pipe 16.

The behavior of the absorbent liquid and the coolant at this time will be described. The rare water source regenerator 9 is conveyed from the absorber 2 to the low heat source regenerator 9 of the low heat source regenerator condenser main body 11 via the absorbent liquid tube 21. The absorbent liquid is heated through the pipe wall of the heat transfer tube 9B in the vessel by the warm water drainage supplied from the other equipment such as a cogeneration device via the low heat source supply pipe 16 to evaporate and separate the refrigerant.

The intermediate absorbent liquid in which the absorbent concentration is increased by evaporating the refrigerant is heated by the intermediate absorbent pump P2 of the absorbent liquid pipe 22 through the high temperature heat exchanger 13 and then transferred to the high temperature regenerator 5.

The intermediate absorbent liquid returned to the high temperature regenerator 5 is heated here by the flame by the gas burner 4 and the high temperature combustion gas, and the refrigerant is evaporated off. The intermediate absorbent liquid whose concentration is raised by evaporating and separating the refrigerant from the high temperature regenerator 5 is transferred to the low temperature regenerator 6 via the high temperature heat exchanger 13 like the conventional dual effect absorption refrigerator.

In the low temperature regenerator 6, the intermediate absorbent liquid is supplied from the high temperature regenerator 5 via the refrigerant vapor pipe 31 and heated by the high temperature refrigerant vapor flowing through the heat transfer pipe 6A. Furthermore, this concentrated absorbent liquid is transferred to the absorber 2 via the low temperature heat exchanger 12, and is sprayed onto the heat transfer pipe 2B from the upper spreader 2A.

The refrigerant separated and generated by the low heat source regenerator (9) enters the condenser (10) and radiates and condenses by cooling water flowing inside the cooling water pipe (15), and the refrigerant separated and produced by the low temperature regenerator (6) is transferred to the condenser (7). Condensate in as well. The refrigerant liquid generated in the condenser 7 enters the refrigerant pipe 32 through the refrigerant pipe 32, and the refrigerant liquid condensed by the condenser 10 enters the evaporator 1 via the refrigerant pipe 33. It becomes a nutrient solution by operation of and spreads | spreads from the spreader 1A onto the heat exchanger tube 1B.

Since the refrigerant liquid sprayed on the heat transfer tube 1B evaporates the vaporization heat from the water flowing inside the heat transfer tube 1B and evaporates, the water flowing inside the heat transfer tube 1B is cooled, and the cold water thus produced is cold / hot water. It is supplied to the heat load from the pipe 14, and cooling operation, such as cooling, is performed.

The refrigerant evaporated in the evaporator 1 enters the absorber 2, is supplied from the low temperature regenerator 6, and is absorbed by the concentrated absorbent liquid sprayed onto the heat transfer pipe 2B from the upper spreader 2A, and the absorber 2. ) Is stored in the absorbent liquid storage unit, and the circulation conveyed to the low heat source regenerator 9 of the low heat source regenerator condenser main body 11 by the rare water absorbent liquid pump P1 is repeated.

When the outlet temperature t of the cold water measured by the temperature sensor S1 decreases by the continuation of the said single-duplex operation, and it becomes 8 degrees C or less and 7 degrees C or more, the opening-closing valve V3 will be in the open state. The valve opening degree of the fuel control valve V2 is adjusted, and the valve opening degree of the valve opening degree Vpid calculated by the PID calculation method shown in Fig. 2B is adjusted, and the outlet temperature t of the cold water is Although heating of the absorbing liquid by the gas burner 4 is suppressed before it falls to 7 degreeC which is a preset temperature, since combustion of gas by the gas burner 4 is continued, the three-way valve V1 has a valve opening degree of 100 The total open state of% is maintained, and the heating action of the absorbing liquid by the hot and drained water supplied through the low heat source supply pipe 16 is maintained to the maximum.

When the outlet temperature t of cold water measured by the temperature sensor S1 becomes 7 degrees C or less and 6 degrees C or more of a preset temperature, even if operation which suppressed the heating of the absorbing liquid in the high temperature regenerator 5 continues, fuel control The valve opening degree of the valve V2 is the valve opening degree Vp calculated by the proportional calculation method shown in Fig. 2A and the valve opening degree calculated by the PID calculation method shown in Fig. 2B. Although the heating in the high temperature regenerator 5 is further suppressed by adjusting to the small valve opening degree in Vpid, since the combustion of the gas by the gas burner 4 is continuing, the three-way valve V1 opens a valve. The total open state with the degree of 100% is maintained, and the heating action of the absorbing liquid by the hot and drained water supplied through the low heat source supply pipe 16 is kept to the maximum.

And even if heating of the absorbing liquid in the high temperature regenerator 5 is further suppressed, when the outlet temperature t of the said cold water becomes lower than predetermined 6 degreeC, the valve opening degree of the fuel control valve V2 will be 0%, ie, At the same time, the on-off valve V3 is closed to stop combustion of the gas by the gas burner 4, and the valve opening of the three-way valve V-1 increases the outlet temperature t of the cold water. Since it is controlled by PID control made into a variable and the heating action with respect to an absorption liquid does not fall rapidly, the temperature of the cold water which circulates and supplies to a heat load through the cold / hot water pipe 14 is stabilized.

In addition, when the combustion of the gas by the gas burner 4 is stopped and the heating of the absorbing liquid in the high temperature regenerator 5 is stopped, for example, the frequency of the power obtained from the relational expression shown in FIG. It is supplied to the motor (not shown) of P2, and the rotation speed of the intermediate | middle absorption liquid pump P2 is controlled.

That is, when the heating of the absorbent liquid in the high temperature regenerator 5 is stopped, a part of the refrigerant is evaporated and separated from the high temperature regenerator 5, and the high temperature regenerator outlet temperature T of the absorbent liquid measured by the temperature sensor S2. The control program is configured such that the frequency of the electric power, which can be obtained from the relational expression set as a variable, is supplied to a motor (not shown) of the intermediate absorbent liquid pump P2, and the rotation speed of the intermediate absorbent liquid pump P2 is controlled.

Therefore, the rotation speed of the intermediate absorbent liquid pump P2 gradually decreases as the temperature of the absorbent liquid in the high temperature regenerator 5 decreases, and when the outlet temperature T of the absorbent liquid drops to 100 ° C, the intermediate absorbent liquid pump P2 Since it rotates at the minimum rotation speed, abrupt fluctuation | variation of the absorbent liquid circulation amount can be prevented.

The control program is configured such that the intermediate absorbent liquid pump P2 also stops rotation when a liquid level higher than a predetermined height is detected by a liquid level detection means (not shown) provided in the high temperature regenerator 5.

Then, when both the heating of the absorbing liquid by the gas burner 4 and the operation of the intermediate absorbent liquid pump P2 are stopped, the absorbing liquid is only in the low heat source regenerator 9 by the warm water supplied from the low heat source supply pipe 16. Heated to evaporate the refrigerant. The absorbent liquid having a high absorbent liquid concentration is returned to the absorber 2 via the bypass tube 26 and the low temperature heat exchanger 12.

On the other hand, the refrigerant vapor separated and generated by the low heat source regenerator 9 enters the condenser 10 and condenses, enters the evaporator 1 via the refrigerant pipe 33, and spreads the sprayer 1A by the operation of the refrigerant pump P3. ) Is sprayed onto the heat transfer tube 1B, takes heat from the cold water passing through the heat transfer tube 1B, evaporates, enters the absorber 2, and is absorbed by the absorbing liquid sprayed from above.

Thereafter, even if the heat load is increased and the outlet temperature t of the cold water becomes 6 ° C or more and 7 ° C or less, the on-off valve V3 and the fuel control valve V2 continue to close and the gas by the gas burner 4 is maintained. Since there is no combustion, the PID control based on the valve opening degree of the three-way valve V1 based on the outlet temperature t of the cold water is continued, and the heating of the absorbing liquid by the warm water supplied through the low heat source supply pipe 16 is continued. This becomes stronger.

Further, when the heat load is increased and the outlet temperature t of the cold water is 7 ° C. or higher and 8 ° C. or lower, the on-off valve V3 is opened to open the valve of the fuel control valve V2 in FIG. The valve opening degree Vp calculated by the proportional calculation method shown in Fig. 2 and the small valve opening degree in the valve opening degree Vpid calculated by the PID calculation method shown in Fig. 2B are adjusted and the gas burner 4 is adjusted. The combustion of the gas by the gas is resumed, and the valve opening degree of the three-way valve V1 is 100%, that is, it is fully opened, so that the heating of the absorbent liquid utilizing the warm water drainage supplied from the low heat source supply pipe 16 is resumed. Rapid heating is avoided, and the temperature of the cold water circulated and supplied to the heat load via the cold / hot water pipe 14 is stabilized.

When the heat load further increases and the outlet temperature t of the cold water rises to 8 ° C. or more, the on-off valve V3 is maintained at the valve opening, so that the valve of the three-way valve V1 and the fuel control valve V2 is maintained. The opening degrees are all adjusted to 100%, that is, the total opening, and the amount of heat input to the absorption refrigerator 100 is returned to the maximum amount of heat during normal operation.

In addition, although the heat load is large, when the temperature of the hot / exhaust water supplied to the low heat source regenerator 9 via the low heat source supply pipe 16 does not reach a predetermined 85 ° C, the low heat source regenerator 9 and three chambers are used. When the temperature of the heated wastewater returned through the valve V1 does not reach 70 ° C, the three-way valve V1 is switched so that the heated wastewater is not supplied from the low heat source supply pipe 16 to the low heat source regenerator 9. And all the pumps are started, and the double effect operation which burns gas in the gas burner 4 is performed. Also in this case, the thermal power of the gas burner 4 is controlled by the controller C so that the outlet temperature of the cold water measured by the temperature sensor S1 becomes 7 ° C of the predetermined temperature.

In this dual-efficient operation, the rare absorbent liquid in the absorbent liquid storage part of the absorber 2 is returned to the low heat source regenerator 9 by the rare absorbent liquid pump P1. However, since the warm water as a heat source is not supplied to the heat transfer pipe 9B. In the non-heated state, the intermediate absorbent liquid pump P2 is returned to the high temperature regenerator 5 via the high temperature heat exchanger 13, and thereafter, it is heated while circulating in the same manner as in the above-mentioned double effect operation. In the high temperature regenerator 5 and the low temperature regenerator 6, concentrated regeneration of the absorbing liquid and separate generation of the refrigerant are performed.

In the single dual-effect absorption chiller 100 of the present invention having the above-described configuration, the stopping and resumption of combustion in the gas burner 4 are not performed in a state in which the valve opening of the fuel control valve V2 is large. The outlet temperature of the cold water circulated and supplied to the heat load from the evaporator 1 via the cold / hot water pipe 14 is stabilized.

In addition, this invention is not limited to the said Example, A various deformation | transformation is possible in the range which does not deviate from the meaning described in the claim.

For example, the rotation of the intermediate absorbent liquid pump P2 when the heating of the absorbent liquid by the gas burner 4 is stopped can be controlled as shown in FIG. 5 in addition to the control as described above.

That is, when the heating of the absorbent liquid of the high temperature regenerator 5 by the gas burner 4 is stopped, an appropriate coefficient provided to decrease with the passage of time from the stop of combustion is supplied to the motor of the intermediate absorbent liquid pump P2 at the time of stop of combustion. Even if the control program stored in the memory unit of the controller C is changed to supply the frequency obtained by multiplying the supplied power frequency to the motor of the intermediate absorbent liquid pump P2 to control the rotation speed of the intermediate absorbent liquid pump P2. good. Even if the intermediate absorbent liquid pump P2 is controlled in this manner, a sudden change in the absorbed liquid circulation amount can be prevented.

According to the present invention, since the sudden fluctuation of the combustion amount is eliminated, cold water with a small temperature fluctuation can be supplied to the heat load. Further, in the invention of claim 2, the valve opening operation of the fuel control valve is limited to when the valve opening for controlling the flow rate of the hot water is 100% of the total opening, and the operation using the exhaust heat supplied from other equipment is possible. Become.

Claims (3)

Evaporator absorber body with evaporator and absorber, Low temperature regenerator condenser body with low temperature regenerator and condenser A fuel control valve for adjusting the amount of fuel to be supplied to the burner in the single double effect absorption chiller configured by pipe connection of a high temperature regenerator having a burner, a low temperature heat exchanger, a high temperature heat exchanger, a refrigerant pump, and an absorbent liquid pump. The valve opening degree of the valve is obtained by proportional calculation that takes the heat of the refrigerant evaporated from the evaporator, the temperature of the cold water discharged from the evaporator as a variable, and the PID operation that uses the outlet temperature of the cold water as a variable. By comparing the valve opening degree obtained by First driving method of the effectiveness of the absorption refrigerating machine of the second, characterized in that for controlling the. The single-use double absorption absorption refrigerator according to claim 1, wherein the valve opening operation of the fuel control valve is limited to the total opening time at which the valve for controlling the flow rate of the hot water supplied from another facility is 100%. Way of driving. The double-doublet according to claim 1 or 2, wherein the amount of circulation of the absorbent liquid to the high temperature regenerator decreases with the decrease of the high temperature regenerator temperature or the passage of time after the entire closing operation of the fuel control valve. Operation method of a utility absorption refrigerator.

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