JP2657702B2 - Operating method of absorption refrigeration system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an operation method of an absorption refrigeration apparatus, and more particularly, to an operation method after power recovery when an absorption refrigeration apparatus is stopped due to a power failure. The refrigerating apparatus can be used if it is an absorption type such as a single effect or a double effect.

[Conventional technology]

2. Description of the Related Art Conventionally, an absorption refrigerating apparatus having an absorber, an evaporator, a generator, a condenser, and a solution path and a refrigerant path connecting these devices is operated in a state of a high solution concentration during normal operation. If the operation is stopped due to a power failure during the operation in the high solution concentration state, the crystals will precipitate as the solution concentration decreases, and even if the power is restored, the solution circulation will be hindered and the subsequent operation will not be possible. There was a problem.

[Problems to be solved by the invention]

The object of the present invention is to solve the problems of the prior art as described above, when the emergency refrigeration device is stopped due to a power failure during operation in a high solution concentration state, eliminating the effects of the crystal after power recovery, An object of the present invention is to provide a driving method capable of prompt driving.

[Means for solving the problem]

In order to achieve the above object, the present invention relates to an absorption refrigeration apparatus having an absorber, an evaporator, a generator, a condenser and a solution path, a refrigerant path, a chilled water load path, and a chilled water path connecting these devices. When the operation is restarted when the operation of the device is urgently stopped due to a power failure while the heat source is being supplied to the vessel and the operation is restarted, after the power is restored, if the solution temperature after the power restoration is lower than the set temperature, the cooling water pump is turned off. Without operating, mixing the solution by operating the solution pump, and, if necessary, the method of operating the absorption refrigeration apparatus, characterized by performing dilution of the solution with a refrigerant, and, The cooling water pump is operated or returns to the normal operation after a lapse of a predetermined time by operating the solution pump.

Further, in the present invention, after the power recovery when the power is stopped due to the power failure, when the solution temperature after the power recovery is higher than the set temperature,
While the cooling water pump and the chilled water pump are operating, the solution pump is operated to mix the solution, and if necessary, the solution is diluted with a refrigerant or returned to the normal operation.

In the present invention, the set temperature of the solution temperature is determined based on the solution concentration at the time of the power failure, and the measurement of the solution temperature is preferably the concentrated solution temperature of the heat exchanger. Can be estimated.
The solution concentration may be measured directly, but may be indirectly measured from the relationship between the solution temperature and the dew point temperature.

Then, by judging the solution concentration, it is determined whether or not the solution is diluted by the refrigerant in the operation after the restoration of power supply. However, when the solution concentration is lower than the set concentration, the dilution is not performed.

In the absorption refrigeration apparatus of the present invention, the portion having a high solution concentration is on the concentrated solution side of the solution heat exchanger, and this portion exchanges heat with the dilute solution.

If the power outage time is long and the solution temperature is low to some extent and there is no room for the crystal, or if the crystal has already started, cooling should be avoided as much as possible. The dilute solution is
Since the solution is cooled by the cooling water, in such a case, it is preferable to operate the solution pump without flowing the cooling water and perform the solution (dilute solution, concentrated solution) without cooling the concentrated solution as much as possible. In this case, dilution (the refrigerant may be transferred to the solution side) may be performed, or the presence or absence of dilution may be determined based on the solution concentration.

〔Example〕

Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
The present invention is not limited to this.

FIG. 1 is a process chart for explaining the operation method of the present invention.

In FIG. 1, each device includes an absorber 1, an evaporator 2, a generator 3, a condenser 4, a heat exchanger 5, a solution pump 8, a refrigerant pump 9, a cooling tower 6, a load 7, a cooling water circulation pump 10, and cold water. It consists of a pump 11. Each of the above-described devices is connected by a pipe including a solution path, a refrigerant path, a cold water load path, and a cooling water path.

During the normal operation of the device configured as described above, first, the absorption solution is supplied from the absorption pump 8 to the pipe 1 from the bottom of the absorber.
The heat exchanger 5 passes through the heat exchangers 3 and 14, is heated, and enters the generator 3 through the pipe 15. In the generator 3, the refrigerant that has been heated by the heat source 27 and absorbed has been evaporated and concentrated. The concentrated solution having a high concentration is discharged from the lower part of the generator by a pipe 16 and is exchanged with a low-temperature solution that has absorbed the refrigerant in the heat exchanger 5. The solution path is completed by being guided to the top of the tube and being sprayed onto the cooling tube to absorb the evaporated refrigerant. The absorbed refrigerant is evaporated in the generator 3 and condensed in the condenser 4 cooled by the cooling water.
Is sent to the evaporator 2. On the other hand, the refrigerant that does not evaporate is circulated to the evaporator through the pipes 19 and 20 by the refrigerant pump 9. In the evaporator 2, the cold generated by the evaporation of the refrigerant is transmitted to the cold water circulating between the evaporator 2 and the load 7 by the cold water pump 11 and the pipe 21, and the load 7 is used for cooling or the like. Further, in the cooling water path, the water cooled by the cooling tower enters the absorber 1 through the pipe 22 by the cooling water pump 10, cools the absorbing solution, further enters the condenser through the pipe 23, and The liquid is condensed and heated from itself,
After passing through 24, it is sent to the cooling tower again and takes a circulation route to be cooled.

If an emergency stop occurs due to a power failure during such a normal operation, it is preferable to operate as shown in FIG. 2 after the power is restored. In FIG. 2, first, temperature detectors 28 and 29 are installed in the generator 3 or the heat exchanger 5, and the temperature of the solution in these is measured.

When the power outage time is short, the solution temperature is high to some extent, and there is room for the crystals, the operation can be returned to the normal operation as it is, and the operation can be performed.

If the power outage time is long, the solution temperature is lower than the set temperature, and there is no room for the crystal, or if the crystal has already started, it is necessary to avoid cooling the solution as much as possible. Pump 10 must not be running.
In such a case, the solution pump 8 is operated without flowing cooling water to mix the solution, that is, mix the dilute solution and the concentrated solution without cooling the concentrated solution as much as possible, so that the concentrated solution having a high possibility of forming crystals is formed. The solution should be thin. In this case, judging the solution concentration, when there is a danger of crystallization higher than the set concentration, it is preferable to open the refrigerant return valve 12 and transfer the refrigerant to the solution side from the lower part of the evaporator 2 by the pipe 30. . If the concentrated solution is diluted as described above, the mixing operation has been completed, so that the cooling water pump can be operated and the operation can be returned to the normal operation.

Above, the single-effect absorption refrigeration system has been described.
In addition to single effects, double effects and direct fire double effects can also be used.

〔The invention's effect〕

According to the operation method of the present invention, it is possible to eliminate the influence of the precipitation of crystals in the absorption solution and quickly return to normal operation, which is a very effective method for operating the absorption refrigeration system.

[Brief description of the drawings]

FIG. 1 is a process chart for explaining an operation method of the present invention, and FIG. 2 is a flowchart showing an operation sequence. DESCRIPTION OF SYMBOLS 1 ... Absorber, 2 ... Evaporator, 3 ... Generator, 4 ... Condenser, 5 ... Heat exchanger, 6 ... Cooling tower, 7 ... Load, 8
... solution pump, 9 ... refrigerant pump, 10 ... cooling water circulation pump, 11 ... cold water pump, 12 ... refrigerant return valve, 28, 29
…… Temperature detector

Claims (5)

(57) [Claims] In an absorption refrigeration apparatus having an absorber, an evaporator, a generator, a condenser and a solution path, a refrigerant path, a chilled water load path and a cooling water path connecting these devices, a heat source is supplied to the generator. During the operation, when the operation of the device is urgently stopped due to a power failure, when the operation is restarted, after the power is restored, if the solution temperature after the power restoration is lower than the installation temperature, the cooling water pump is not operated, and the solution is not operated. A method for operating an absorption refrigerating apparatus, comprising: operating a pump to mix a solution; and, if necessary, diluting the solution with a refrigerant. 2. The method according to claim 1, wherein after the solution pump is operated to mix or dilute the solution, the cooling water pump is operated and / or returned to a normal operation after a predetermined time. Method of operating an absorption refrigeration system. 3. The method according to claim 1, wherein when the solution temperature after the power recovery is higher than the set temperature, the solution pump is operated while the cooling water pump and the cold water pump are operated to mix the solution. A method for operating an absorption refrigeration apparatus, comprising: performing dilution of a solution with a refrigerant as necessary, or returning to normal operation. 4. The method of operating an absorption refrigeration system according to claim 1, wherein the set temperature is determined based on a solution concentration at the time of a power failure. 5. The method according to claim 1, wherein the dilution of the solution with the refrigerant is not performed when the solution concentration at the time of the power failure is lower than the set concentration.