JP4606255B2 - Operation method of single double effect absorption refrigerator - Google Patents

Description

  The present invention relates to a method for operating a single double-effect absorption refrigerator (including an absorption chiller / heater).

  As this type of absorption refrigerator, for example, as shown in FIG. 6, a high-temperature regenerator 5 that heats the absorption liquid by using combustion heat generated in the gas burner 4 as a heat source and evaporates and separates the refrigerant is supplied from the high-temperature regenerator 5. The low-temperature regenerator 6 is a double-effect regenerator that heats the absorption liquid by using the refrigerant vapor as a heat source to evaporate and separate the refrigerant, and the refrigerant vapor supplied from the low-temperature regenerator 6 is condensed in parallel with the low-temperature regenerator The absorption liquid is heated by using, for example, a relatively low-temperature hot waste water of about 80 ° C. supplied from the condenser 7 of the double-effect condenser, the cogeneration device, etc., through the low heat source supply pipe 16 to evaporate the refrigerant. A low heat source regenerator 9 of a single effect regenerator to be separated, a condenser 10 of a single effect condenser which is provided in parallel to the low heat source regenerator 9 and condenses the refrigerant vapor supplied from the low heat source regenerator 9, a condenser 7 And supplied from condenser 10 An evaporator 1 for evaporating the refrigerant liquid to be evaporated, an absorber 2 for absorbing the refrigerant vapor evaporated in the evaporator 1 by the concentrated absorbent supplied from the low temperature regenerator 6, a rare absorbent pump P1, an intermediate absorbent pump P2, A single double-effect absorption refrigerator 100X including a refrigerant pump P3 and the like is well known (for example, see Patent Document 1).

  In the figure, 3 is an evaporator absorber cylinder containing the evaporator 1 and the absorber 2, 8 is a low temperature regenerator condenser cylinder containing the low temperature regenerator 6 and the condenser 7, and 11 is a low heat source regenerator. 9 is a low heat source regenerator condenser body containing the condenser 9 and the condenser 10, 12 is a low-temperature heat exchanger, 13 is a high-temperature heat exchanger, and 14 is a cooling / heating device that circulates and supplies cold heat or heat to a heat load (not shown). A cold / hot water pipe through which cold water or hot water flows, 15 is a cooling water pipe.

  In the absorption refrigerator 100X having the above-described configuration, the hot waste water supplied to the low heat source regenerator 9 from other equipment such as a cogeneration device (not shown) via the low heat source supply pipe 16 is preferentially used, It is expected to increase the energy saving effect.

Therefore, when the evaporator outlet temperature cooled by the evaporator 1 and circulated to the heat load via 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 supplied Only the warm waste water supplied through the pipe 16 is operated as a heat source.
JP-A-6-341729

  However, in the above conventional control method, it is possible to preferentially use the exhaust heat supplied from other equipment such as a cogeneration system, but the combustion may be stopped at once from high combustion, and it is supplied to the heat load. There was a risk of hunting due to a large evaporator outlet temperature.

  Accordingly, priority is given to the use of hot wastewater so that energy-saving operation is possible, but it is necessary to prevent the outlet temperature of the cold water circulated and supplied to the heat load from fluctuating greatly, and the solution has been a problem.

An evaporator absorber cylinder containing an evaporator and an absorber, a low-temperature regenerator condenser cylinder containing a low-temperature regenerator and a condenser, a low heat source regenerator using hot waste water supplied from other facilities as a heat source, and Low heat source regenerator housing the condenser, condenser body, high temperature regenerator with absorption liquid heating burner, low temperature heat exchanger, high temperature heat exchanger, refrigerant pump, absorption liquid pump, etc. In the single double-effect absorption refrigerator, the valve opening degree of the fuel control valve for adjusting the amount of fuel supplied to the burner is deprived of heat by the refrigerant evaporating in the evaporator, cooled and discharged from the evaporator The valve opening obtained by proportional calculation with the cold water outlet temperature as a variable is compared with the valve opening obtained by PID calculation with the cold water outlet temperature as a variable, and a smaller valve opening is selected. It controls the heating power of the burner, the total closing of the fuel control valve After, with the passage of decreased or time of the high-temperature regenerator temperature is controlled to circulate the supply amount of the absorbing liquid to the high-temperature regenerator is gradually reduced, a refrigerating machine for mainly characterized in that.

  According to the present invention, since the rapid fluctuation of the combustion amount is eliminated, cold water having a small temperature fluctuation can be supplied to the heat load. In addition, in the invention of claim 2, the opening operation of the fuel control valve is limited to when the opening degree of the valve for controlling the flow rate of the hot waste water is 100% fully open. Operation that makes full use of exhaust heat is possible.

  An evaporator absorber cylinder containing an evaporator and an absorber, a low-temperature regenerator condenser cylinder containing a low-temperature regenerator and a condenser, a low heat source regenerator using hot waste water supplied from other facilities as a heat source, and Low heat source regenerator housing the condenser, condenser body, high temperature regenerator with absorption liquid heating burner, low temperature heat exchanger, high temperature heat exchanger, refrigerant pump, absorption liquid pump, etc. In the single double-effect absorption refrigerator, the valve opening degree of the fuel control valve for adjusting the amount of fuel supplied to the burner is deprived of heat by the refrigerant evaporating in the evaporator, cooled and discharged from the evaporator The valve opening obtained by proportional calculation with the cold water outlet temperature as a variable is compared with the valve opening obtained by PID calculation with the cold water outlet temperature as a variable, and a smaller valve opening is selected. Controls the burner thermal power, and opens the fuel control valve The operation is limited to when the opening of the valve that controls the flow rate of hot waste water supplied from other equipment is fully open, and the high temperature regeneration after the fuel control valve is fully closed. The circulating supply amount of the absorption liquid to the high-temperature regenerator was gradually decreased as the temperature of the reactor decreased or as time passed.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In order to facilitate understanding, in these drawings also, parts having the same functions as those described in FIG. 6 are given the same reference numerals, and descriptions thereof are omitted in a range that does not hinder understanding.

  The absorption refrigerator 100 of the present invention illustrated in FIG. 1 is a single double-effect absorption chiller / heater using water as a refrigerant and an aqueous lithium bromide (LiBr) solution as an absorption liquid. An evaporator body 3 containing the regenerator 2, a high-temperature regenerator 5 having a gas burner 4 as absorption liquid heating means, a low-temperature regenerator 6, a condenser 7 arranged in parallel with the low-temperature regenerator 6, a low-temperature regenerator 6 and a condenser 7, a low-temperature regenerator condenser body 8, a low heat source regenerator 9 that uses hot wastewater supplied from other equipment as a heat source, and a condenser 10 that is arranged in parallel with the low heat source regenerator 9. The low heat source regenerator 9 and the condenser 10 containing the low heat source regenerator condenser body 11, the low temperature heat exchanger 12, the high temperature heat exchanger 13, the rare absorption liquid pump P1, the intermediate absorption liquid pump P2, and the refrigerant pump P3 , Three-way valve V1, fuel control valve V2, on-off valves V3 to V7, etc. Et absorption liquid pipe 21 through 26 as shown, and connected by piping via a refrigerant pipe 31 to 35. Reference numeral 14 is 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 control. It is a vessel.

  During the cooling operation such as cooling of the absorption refrigerator 100 having the above-described configuration, the temperature of the evaporator 1 at the outlet side of the chilled water circulated and supplied to the heat load (not shown) through the cold / hot water pipe 14, that is, the refrigerant pump P3. The refrigerant liquid that has been pumped up and sprayed from the spreader 1A onto the heat transfer tube 1B is cooled when flowing through the heat transfer tube 1B due to the evaporation heat, and is discharged from the evaporator 1 and discharged by the temperature sensor S1. The controller C controls the amount of heat input to the absorption refrigerator 100 so that the measured cold water evaporator outlet temperature t becomes a predetermined set temperature, for example, 7 ° C.

  More specifically, for example, in the memory unit (not shown) of the controller C, two different systems are used in which the opening temperature of the fuel control valve V2 of the gas burner 4 is set as a variable, as illustrated in FIG. First, the control program for selecting and adjusting a small opening degree of the calculation, and when the gas burns in the gas burner 4 and the absorbing liquid is heated in the high temperature regenerator 5, the low heat source supply pipe 16 three-way valve V1 opening degree on the low heat source regenerator 9 side (flow rate ratio with respect to the maximum flow rate of the warm waste water flowing through the low heat source supply pipe 16 to the low heat source regenerator 9 side. When the gas burner 4 is not fully burned and there is no gas combustion, a program for controlling the outlet temperature t of the cold water as a variable is stored by a conventionally known PID control. Have .

  Further, in the memory part of the controller C, the opening / closing of the opening / closing valve V3 located upstream of the fuel regulating valve V2 of the fuel supply pipe 17 connected to the gas burner 4 is shown on the basis of the outlet temperature t of the cold water. A control program for controlling as shown in FIG. 3 is also stored.

  Therefore, during the cooling operation such as cooling performed by circulating the cold water cooled by the evaporator 1 to the heat load via the cold / hot water pipe 14, the control program stored in the memory unit of the controller C is used. The opening degree of the fuel control valve V2 is 100% when the evaporator t outlet side temperature t measured by the temperature sensor S1 is higher than 8 ° C., so that Vp = Vpid = 100%. When the chilled water outlet temperature t is lower than 8 ° C. and higher than the set temperature of 7 ° C., Vpid ≦ Vp = 100%, so that the chilled water outlet temperature t is calculated by the PID calculation method. When the chilled water outlet temperature t is lower than the set temperature 7 ° C. and higher than 6 ° C., the valve opening calculated by the proportional calculation method using the chilled water outlet temperature t as a variable is adjusted to the valve opening Vpid. Vp is compared with the valve opening Vpid calculated by the PID calculation method using the outlet temperature t of the cold water as a variable, the valve opening of the fuel control valve V2 is adjusted to a smaller valve opening, and the cold water When the outlet temperature t is lower than 6 ° C., Vp = Vpid = 0%, so that it is 0%, that is, fully closed, and the on-off valve V3 is also closed.

  In addition, the control program stored in the controller C can be used 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 control of the valve V <b> 1 is executed, and the absorption liquid is heated by the warm drainage in the low heat source regenerator 9.

  In addition, the program stores the amount of hot waste water flowing through the low heat source regenerator 9 so that the temperature of the warm waste water that circulates through the low heat source regenerator 9 and the three-way valve V1 does not drop to a predetermined temperature, for example, 70 ° C. It is also configured to restrict.

  Accordingly, a cooling operation is started while flowing cooling water through the cooling water pipe 15 in a state where hot waste water having a temperature higher than a predetermined 85 ° C. is supplied through the low heat source supply pipe 16, and the temperature load is high because the heat load is large. When the outlet temperature t of the cold water measured by S1 is higher than 8 ° C., for example, the controller C opens the on-off valve V3 interposed in the fuel supply pipe 17, and the fuel control valve V2 has a valve opening degree of 100%. That is, since gas is burned by the gas burner 4 after being fully opened, the valve opening degree of the three-way valve V1 is also adjusted to 100%, and the absorption chiller 100 is charged with the maximum amount of heat during normal operation. .

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

  Explaining the behavior of the absorption liquid and the refrigerant at this time, the rare absorption transferred from the absorber 2 to the low heat source regenerator 9 of the low heat source regenerator condenser body 11 by the rare absorption liquid pump P1 through the absorption liquid pipe 21. The liquid is heated through the tube wall of the heat transfer tube 9B in the vessel by warm wastewater supplied from another facility such as a cogeneration device through the low heat source supply tube 16 to evaporate and separate the refrigerant.

  The intermediate absorption liquid whose absorption liquid concentration is increased by evaporating and separating the refrigerant is heated via the high temperature heat exchanger 13 by the intermediate absorption liquid pump P2 of the absorption liquid pipe 22 and sent to the high temperature regenerator 5.

  The intermediate absorption liquid conveyed 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 evaporates and separates. The intermediate absorption liquid whose concentration has been increased by evaporating and separating the refrigerant in the high temperature regenerator 5 is sent to the low temperature regenerator 6 via the high temperature heat exchanger 13 as in the conventional double effect absorption refrigerator.

  Then, the intermediate absorption liquid is heated in the low temperature regenerator 6 by the high temperature refrigerant vapor supplied from the high temperature regenerator 5 via the refrigerant vapor pipe 31 and flowing through the heat transfer pipe 6A, and further the refrigerant is separated to further increase the concentration. Thus, the concentrated absorbent is sent to the absorber 2 via the low-temperature heat exchanger 12, and is spread on the heat transfer tube 2B from the upper spreader 2A.

  The refrigerant separated and generated by the low heat source regenerator 9 enters the condenser 10, dissipates heat and condenses into the cooling water flowing inside the cooling water pipe 15, and the refrigerant separated and generated by the low temperature regenerator 6 enters the condenser 7. Condensates as well. The refrigerant liquid generated in the condenser 7 enters the evaporator 1 through the refrigerant pipe 32 and the refrigerant liquid condensed and generated in the condenser 10 enters the evaporator 1 through the refrigerant pipe 33, and is pumped by the operation of the refrigerant pump P3. It spreads on the heat exchanger tube 1B from the spreader 1A.

  The refrigerant liquid sprayed on the heat transfer tube 1B takes the heat of vaporization from the water flowing inside the heat transfer tube 1B and evaporates. Therefore, the water flowing inside the heat transfer tube 1B is cooled, and the generated cold water is cooled. / Cooling operation such as cooling is performed by being supplied from the hot water pipe 14 to the heat load.

  Then, the refrigerant evaporated in the evaporator 1 enters the absorber 2 and is absorbed by the concentrated absorbent supplied from the low temperature regenerator 6 and sprayed on the heat transfer pipe 2B from the upper sprayer 2A. The circulation is repeated in the absorption liquid reservoir and conveyed to the low heat source regenerator 9 of the low heat source regenerator condenser body 11 by the rare absorption liquid pump P1.

  When the outlet temperature t of the chilled water measured by the temperature sensor S1 decreases due to the continuation of the single double effect operation and becomes 8 ° C. or lower and 7 ° C. or higher, the on-off valve V3 is maintained in the open state, and the fuel control valve The valve opening degree of V2 is adjusted to the valve opening degree of the valve opening degree Vpid calculated by the PID calculation method shown in FIG. 2B, and the gas burner before the outlet temperature t of the cold water drops to the set temperature of 7 ° C. Although the heating of the absorption liquid by the gas burner 4 is suppressed, the gas combustion by the gas burner 4 is continued. Therefore, the three-way valve V1 is maintained in a fully opened state with a valve opening degree of 100% and is supplied through the low heat source supply pipe 16. The heating action of the absorption liquid by the heated waste water is maintained at the maximum.

  Even if the operation of suppressing the heating of the absorbing liquid in the high-temperature regenerator 5 is continued, when the outlet temperature t of the cold water measured by the temperature sensor S1 becomes 7 ° C. or lower and 6 ° C. or higher of the set temperature, the fuel control valve V2 The valve opening is adjusted to a valve opening Vp calculated by the proportional calculation method shown in FIG. 2A and a smaller valve opening Vpid calculated by the PID calculation method shown in FIG. Thus, although the heating in the high-temperature regenerator 5 is further suppressed, the combustion of the gas by the gas burner 4 continues, so that the three-way valve V1 is maintained in a fully opened state with a valve opening degree of 100%, and the low heat source supply pipe 16 The heating action of the absorbing liquid by the hot waste water supplied via the slag is maintained at the maximum.

  Even if the heating of the absorbent in the high temperature regenerator 5 is further suppressed, when the outlet temperature t of the cold water becomes lower than a predetermined 6 ° C., the valve opening degree of the fuel control valve V2 is 0%, that is, the valve is fully closed. At the same time, the on-off valve V3 is closed and the combustion of the gas by the gas burner 4 is stopped, and the valve opening degree of the three-way valve V1 is controlled by PID control using the outlet temperature t of the cold water as a variable to heat the absorbing liquid. Since the action does not suddenly decrease, the temperature of the cold water circulated to the heat load via the cold / hot water pipe 14 is stabilized.

  When the combustion of the gas by the gas burner 4 is stopped and the heating of the absorbent in the high temperature regenerator 5 is stopped, for example, the frequency of the electric power obtained from the relational expression shown in FIG. 4 is applied to a motor (not shown) of the intermediate absorbent pump P2. Supplied and the rotational speed of the intermediate absorbent pump P2 is controlled.

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

  Therefore, the rotational speed of the intermediate absorbent pump P2 gradually decreases as the temperature of the absorbent in the high-temperature regenerator 5 decreases. When the outlet temperature T of the absorbent drops to 100 ° C., the intermediate absorbent pump P2 Since it rotates at the minimum number of revolutions, it is possible to prevent sudden fluctuations in the amount of circulating absorbent liquid.

  It should be noted that when the liquid level detection means (not shown) provided in the high-temperature regenerator 5 detects a liquid level height exceeding a predetermined height, the control program also causes the intermediate absorbing liquid pump P2 to stop rotating. It is configured.

  When both the heating of the absorption liquid by the gas burner 4 and the operation of the intermediate absorption liquid pump P2 are stopped, the absorption liquid is heated only in the low heat source regenerator 9 by the hot waste water supplied from the low heat source supply pipe 16, and the refrigerant Is separated by evaporation. Then, the absorption liquid whose absorption liquid concentration has increased is returned to the absorber 2 via the bypass pipe 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, condenses, enters the evaporator 1 through the refrigerant pipe 33, and operates from the spreader 1A to the heat transfer pipe 1B by operating the refrigerant pump P3. A circulation is performed in which heat is taken from the cold water passing through the heat transfer tube 1B, evaporated, and absorbed into the absorber 2 and absorbed by the absorbent dispersed from above.

  Thereafter, even when the heat load increases and the outlet temperature t of the cold water becomes 6 ° C. or higher and 7 ° C. or lower, the on-off valve V3 and the fuel control valve V2 continue to close and there is no gas combustion by the gas burner 4. Therefore, 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 absorption liquid by the warm waste water supplied through the low heat source supply pipe 16 is strengthened.

  Further, when the heat load increases and the outlet temperature t of the cold water becomes 7 ° C. or more and 8 ° C. or less, the on-off valve V3 is opened and the valve opening degree of the fuel control valve V2 is shown in FIG. The valve opening degree Vp calculated by the proportional calculation method shown in FIG. 2 and the valve opening degree Vpid calculated by the PID calculation method shown in FIG. At the same time, the opening degree of the three-way valve V1 is set to 100%, that is, the absorption liquid heating is resumed by fully utilizing the warm drainage supplied from the low heat source supply pipe 16 so that the absorption liquid is rapidly heated. Is avoided, and the temperature of the cold water supplied to the heat load through 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 higher, the open / close valve V3 is maintained open, and the valve openings of the three-way valve V1 and the fuel control valve V2 are both 100%. In other words, the heat input to the absorption chiller 100 is returned to the maximum heat amount during normal operation.

  Although the heat load is large, when the temperature of the hot wastewater supplied to the low heat source regenerator 9 through the low heat source supply pipe 16 does not reach the predetermined 85 ° C., the low heat source regenerator 9 and the three-way valve V1 are connected. When the temperature of the warm drainage that circulates through has not reached 70 ° C., the three-way valve V1 is switched so that the warm drainage 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 gas burner 4 is performed. Also in this case, the heating 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 a predetermined temperature of 7 ° C.

  In this double-effect operation, the rare absorption liquid in the absorption liquid reservoir of the absorber 2 is conveyed to the low heat source regenerator 9 by the rare absorption liquid pump P1, but hot waste water as a heat source is supplied to the heat transfer tube 9B. Since it is not heated, it is transported to the high-temperature regenerator 5 through the high-temperature heat exchanger 13 by the operation of the intermediate absorption liquid pump P2 without being heated, and then heated while being circulated in the same manner as in the single-double effect operation. The high-temperature regenerator 5 and the low-temperature regenerator 6 concentrate and regenerate the absorbing solution and separate and generate the refrigerant.

  In the single double-effect absorption refrigerator 100 of the present invention having the above-described configuration, the combustion in the gas burner 4 is not stopped and restarted in a state where the valve opening of the fuel control valve V2 is large. The outlet temperature of the chilled water supplied to the heat load through the pipe 14 is stabilized.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit described in the claims.

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

  That is, when heating of the absorption liquid of the high-temperature regenerator 5 by the gas burner 4 is stopped, an appropriate coefficient provided so as to decrease with the passage of time from the combustion stop is assigned to the motor of the intermediate absorption liquid pump P2 at the time of combustion stop. The frequency obtained by multiplying the supplied power frequency is supplied to the motor of the intermediate absorbent pump P2 and stored in the memory unit of the controller C so as to control the rotational speed of the intermediate absorbent pump P2. The control program may be changed. Even if the intermediate absorbing liquid pump P2 is controlled in this way, it is possible to prevent a sudden change in the circulating amount of the absorbing liquid.

It is explanatory drawing which shows the structure of the absorption refrigerator of this invention. It is explanatory drawing which shows the valve opening degree determination point of a fuel control valve. It is explanatory drawing which shows the control point of the on-off valve interposed in a fuel supply pipe. It is explanatory drawing which shows the control point of an intermediate | middle absorption liquid pump. It is explanatory drawing which shows the other control point of an intermediate | middle absorption liquid pump. It is explanatory drawing which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Evaporator 2 Absorber 3 Evaporator absorber cylinder 4 Gas burner 5 High temperature regenerator 6 Low temperature regenerator 7 Condenser 8 Low temperature regenerator condenser cylinder 9 Low heat source regenerator 10 Condenser 11 Low heat source regenerator condenser cylinder 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 21-26 Absorption liquid pipe 31-35 Refrigerant pipe C Controller P1 Rare absorption liquid pump P2 Intermediate absorption liquid pump P3 Refrigerant pump S1 Temperature sensor V1 Three-way valve V2 Fuel control valve V3 to V7 On-off valve 100, 100X Absorption refrigerator

Claims (2)

An evaporator absorber cylinder containing an evaporator and an absorber, a low-temperature regenerator condenser cylinder containing a low-temperature regenerator and a condenser, a low heat source regenerator using hot waste water supplied from other facilities as a heat source, and Low heat source regenerator with a condenser and a condenser body, high temperature regenerator with absorption liquid heating burner, low temperature heat exchanger, high temperature heat exchanger, refrigerant pump, absorption liquid pump, etc. In the single double-effect absorption refrigerator,
The valve opening of the fuel control valve that adjusts the amount of fuel supplied to the burner is a proportional calculation with the outlet temperature of the chilled water cooled and discharged from the evaporator as a variable after the heat is taken away by the refrigerant evaporating in the evaporator And the valve opening obtained by PID calculation using the outlet temperature of the cold water as a variable,
Select a smaller valve opening to control the burner thermal power ,
Control so that the circulating supply amount of the absorbing liquid to the high temperature regenerator is gradually reduced as the temperature of the high temperature regenerator decreases or the time elapses after the fuel control valve is fully closed.
A method for operating a single-double-effect absorption refrigerator.   2. The single operation according to claim 1, wherein the opening operation of the fuel control valve is performed only when the opening degree of the valve for controlling the flow rate of the hot waste water supplied from other equipment is fully open. Operation method of double effect absorption refrigerator.

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