JP2002195678A - Method and device for performance recovery of absorption refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for making performance of a lithium-bromide absorption-refrigerator recover, when a spray nozzle is clogged and the performance is degraded. SOLUTION: From the refrigerator, a refrigerant spray pump (not shown) is demounted, which sucks and discharges liquid refrigerant (water) accumulated in the bottom of an evaporator 4 to a spray nozzle 15, and a cleaning liquid circulating tank 17 is temporarily placed. A cleaning liquid circulation pump 19 is connected to the tank 17 to suck and discharge the cleaning liquid of the tank. An inert gas (e.g., nitrogen gas) is injected in a high vacuum space of the refrigerant circulation system to inhibit inflow of air. The cleaning liquid is sent to the nozzle 15 and sprayed, and at the same time, the liquid refrigerant accumulated in the bottom of the evaporator 4 is conducted to the tank 17, and sucked by the pump 19 for circulation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a lithium bromide absorption refrigerating machine that recovers its performance by removing foreign matter deposited on the nozzle when the performance of the refrigerator has been reduced due to clogging of the nozzle due to long-term operation. And a device for performing the method.

[0002]

2. Description of the Related Art FIG. 3 is a schematic system diagram showing an example of an absorption refrigerator using water as a refrigerant and lithium bromide as an absorption medium. As shown in the legend at the lower right of FIG. 3, the refrigerant liquid 12 indicated by hatching
Is liquid water. The concentrated solution 13 shown with a mesh mark is a concentrated aqueous solution of lithium bromide, and has a very strong ability to absorb water vapor. The dilute solution 14 indicated by spots is a dilute aqueous solution of lithium bromide, and has the property of generating steam when heated and changing to a concentrated solution 13.
The high-temperature regenerator 1 and the low-temperature regenerator 2 are heat exchangers provided with a heating tube, and heat a lithium bromide aqueous solution to generate steam. The aqueous solution of lithium bromide that has generated water vapor is concentrated to become a concentrated solution 13 (a mesh mark). The water vapor generated in the regenerator is guided to the condenser 3 and cooled by the cooling water to become liquid water (refrigerant liquid 12 indicated by oblique parallel lines) and is sent into the evaporator 4 as shown by the arrow a. Since the evaporator 4 is connected to the absorber 9 and is kept at a low pressure close to vacuum for the reason described later, the supplied water (refrigerant) evaporates to remove latent heat of vaporization and cools the cold water.

The liquid water that has not completely evaporated in the evaporator 4 accumulates in a refrigerant tank 5 below the evaporator, is sucked into and discharged from a refrigerant spray pump 6, sent to a spray duct 8, and sent from a spray nozzle 15. It is injected. FIG. 4 is an enlarged sectional view near the nozzle 15. The lithium bromide concentrated solution 13 concentrated in the regenerator is led into the absorber 9 connected to the evaporator 4, and absorbs the vaporized vapor in the evaporator 4. The concentrated solution 13 that has absorbed water vapor in the absorber 9 becomes a dilute solution 14 (shown with spots),
Is returned to the high-temperature regenerator 1 through the heat exchanger 11, and then the above operation is repeated to form an absorption cycle.

[0004]

Since the absorption refrigerator constitutes the absorption cycle as described above, the inside of the equipment must be kept at a high vacuum. However, since the high temperature concentrated lithium bromide aqueous solution is sealed in the refrigerant circulation system, there is a possibility that the degree of vacuum may be reduced due to corrosion of the metal material constituting the closed circulation system. Since a reduction in the degree of vacuum lowers the refrigerating performance, various measures have been taken to prevent corrosion, but it is impossible at this stage to completely eliminate corrosion. For this reason, a small amount of corrosion products are generated and accumulated in the refrigerant circulation system. For this reason, there is a possibility that foreign matter may adhere to the spraying system including the spray nozzle 15 (see also FIGS. 3 and 4) and become bulky. When the spray nozzle 15 is clogged, the amount of the sprayed refrigerant decreases,
Refrigeration capacity decreases.

(See FIG. 1.) When the spray nozzle 15 is partially closed, in the prior art, the evaporator 4 as a closed container had to be cut open to clean the spray nozzle 15. The work of cutting or re-welding the evaporator 4 requires a great deal of time and labor. During that time, the operation as a refrigerator must be stopped, and high repair costs are required. A more serious problem is that when the evaporator 4 forming the closed circulation system is cut, air flows into the refrigerant circulation system maintained at a high vacuum, and corrosion inside the machine is promoted at a stretch. is there. It is an object of the present invention to provide a method for reducing the refrigerating performance due to clogging of a nozzle of a lithium bromide absorption refrigerator without cutting a closed container constituting the absorption refrigerator, and furthermore, a closed circulation. An object of the present invention is to provide a method and a device capable of restoring refrigeration performance quickly, easily, and at low cost without exposing the inner peripheral surface of the system to air.

[0006]

The basic principle of the present invention created to achieve the above object will be briefly described below with reference to FIG. 1 corresponding to one embodiment of the present invention. That is, when the spray nozzle in the lithium bromide absorption refrigerator is clogged and the performance of the refrigerator is reduced, to provide a technology for recovering the performance,
A refrigerant spray pump (not shown) for sucking / discharging the refrigerant liquid (water) accumulated in the lower part of the evaporator 4 and supplying it to the spray nozzle 15 is removed, and a cleaning liquid circulation tank 17 is temporarily installed. A cleaning liquid circulation pump 19 for sucking and discharging the cleaning liquid in the cleaning liquid circulation tank is connected. Then, an inert gas (for example, nitrogen gas) is injected into a high-vacuum space in the refrigerant circulation system of the absorption refrigerator to prevent the inflow of air, and the cleaning liquid is supplied to the nozzle 15 and sprayed. The cleaning liquid collected at the bottom of the evaporator 4 is guided to the cleaning liquid circulation tank 17 and sucked and circulated by the cleaning liquid circulation pump 19.

Based on the principle described above, the method according to the first aspect of the present invention relates to an absorption refrigerator using water as a refrigerant and lithium bromide as an absorption medium. In the method of recovering the performance when foreign matter adheres and accumulates on the spraying device of the above, the performance is recovered by chemically cleaning the spraying system of the refrigerant with a chemical solution to wash and remove the accumulated foreign matter. And According to the invention method of claim 1 described above,
Even if the evaporator is not cut and exposed, the spray nozzle can be remotely cleaned using the cleaning liquid circulation tank or cleaning liquid circulation tank provided outside the refrigerator case to remove foreign substances and restore performance. it can.

According to a second aspect of the present invention, in addition to the constituent elements of the first aspect of the present invention, the chemical solution used for the chemical cleaning is an acidic aqueous solution comprising two or more chemicals. It is characterized by the following. According to the method of the present invention described above, the spray nozzle deposit containing both iron-based corrosion products and copper-based corrosion products can be effectively reduced by using an acidic solution prepared by mixing a plurality of types of chemicals. It can be dissolved and removed.

According to a third aspect of the present invention, in addition to the constituent elements of the second aspect of the present invention, the acidic aqueous solution may be a mixture of hydrochloric acid, sulfuric acid, nitric acid or an inorganic acid similar thereto, and oxalic acid. , Malonic acid, succinic acid or similar organic acids "as a main component,
Further, it is characterized by containing at least one of a "corrosion inhibitor and a potential inhibitor". According to the above-described method of the third aspect of the invention, corrosion products deposited on the spraying device can be efficiently dissolved and removed, and moreover, the metal material constituting the refrigerant circulation system is corroded. Does not occur.

According to a fourth aspect of the present invention, in addition to the constituent features of the first aspect of the present invention, when the spraying system of the refrigerant is washed with a chemical, air is not brought into contact with the inner surface of the spray system. It is characterized by the following. According to the method of the invention described in claim 4 described above, there is no fear that the inner surface of the metal container or the metal pipe constituting the spray system is oxidized and corroded by air.

In the method according to the fifth aspect of the present invention, since the air is not brought into contact with the inner surface of the spraying system, the cleaning is performed in a state where the internal space of the refrigerant circulation system of the absorption refrigerator is filled with an inert gas. Is performed. According to the method of the invention described in claim 5 described above, it is possible to quickly, easily and completely shut off the contact of the internal space of the refrigerant circulation system with air.

According to a sixth aspect of the present invention, in addition to the constituent elements of the first aspect of the present invention, when the spray system is cleaned with the chemical solution, the inside of the refrigerant circulating system of the absorption chiller is used. The refrigerant and the absorbing medium solution are collected in advance outside the refrigerant circulation system and temporarily stored, and after the chemical liquid circulation cleaning inside the apparatus and the chemical liquid are removed, the cleaning liquid is discharged out of the apparatus and then stored. The refrigerant and the absorbing medium solution are injected into a refrigerant circulation system. According to the method of the present invention described above, it is possible to wash and remove deposits in a spray nozzle and a spray hole without fear of mixing a cleaning agent into a refrigerant and an absorbing solution.

According to a seventh aspect of the present invention, in addition to the constituent elements of the second aspect of the present invention, the spray system is washed with the acidic aqueous solution, and then the alkaline neutralizing solution is circulated. The neutralizing operation is terminated after neutralizing and removing the remaining acidic aqueous solution and detecting that the pH has become almost neutral at 6.0 to 8.0. According to the above-described method of the present invention, the waste liquid of the neutralizing agent can be discharged to the river. In the case of slightly acidic pH 6.0 or slightly alkaline pH 8.0, it is not possible to restart the refrigeration cycle by injecting a refrigerant or an absorbing medium solution. , The neutralizing agent can be washed away by washing with water, so that the pH of the neutralization operation is suitably set at pH 6.0 to pH 8.0.

According to an eighth aspect of the present invention, in addition to the constituent elements of the seventh aspect of the present invention, after the neutralization operation is performed until the inside of the refrigerant spray system reaches pH 6.0 to 8.0. After discharging the neutralizing agent solution and adding clean water, the clean water is circulated in the spraying system, and then the cleaning waste water for cleaning is discharged outside the machine, and the soft water flows into the refrigerant circulating system. Then, finishing water washing is performed, and the finished washing waste liquid is discharged outside the machine. According to the above-described method of the present invention, a part (a trace amount) of the cleaning liquid is communicated with the inside of the evaporation chamber provided with the spraying device such as the spray nozzle and the spraying hole, and with the evaporation chamber. Efficiently,
In addition, the refrigeration cycle can be returned to a neutral state completely without any trouble in restarting the refrigeration cycle.

According to a ninth aspect of the present invention, in addition to the constituent elements of the fifth aspect of the present invention, when the inert gas is filled in the refrigerant circulation system to circulate the cleaning liquid, the gas in the machine is circulated. Washing is performed in a state where the pressure is substantially equal to the atmospheric pressure, and after the chemical solution washing, the neutralizing agent washing, and the water washing are completed, the gas pressure is raised above the atmospheric pressure to remove the inert gas. It is characterized in that, while the pressure is released outside the machine, the remaining portion of the washing water used in the water washing inside the machine is discharged outside the machine by the released pressure. According to the method of the ninth aspect described above, the cleaning liquid can be circulated in the spray system in a state where the internal pressure and the atmospheric pressure are balanced,
In addition, the cleaning liquid can be quickly and easily discharged out of the apparatus.

According to a tenth aspect of the present invention, in addition to the constituent elements of the first aspect of the present invention, when the refrigerant spraying system is lined with a chemical solution, the refrigerant circulating system of the absorption type refrigerator is out of line. A washing liquid circulation tank (17) is provided in the washing machine, and a washing liquid is put in the washing liquid circulation tank (17).
9) Inhalation and pressure feeding are performed, and are sprayed from a spray nozzle or a spray hole (15) originally provided in the evaporator of the absorption type water heater. The cleaning water accumulated in (5) is guided to the cleaning liquid circulation tank (17) to be in a state where it can be sucked by the cleaning liquid circulation pump (19), and the spray liquid or the spray nozzle is sprayed while the cleaning liquid is circulated and flowed as described above. The holes (15) are characterized by being made to flow. According to the method of the invention described in claim 10 described above, a simple device can be used without making a major modification to the existing absorption refrigerator and without incising the evaporator which is a large component device. The spray nozzle can be cleaned with a chemical solution.

An eleventh aspect of the present invention is an absorption refrigerator using water as a refrigerant and lithium bromide as an absorption medium, and injects the refrigerant into its evaporator (4). A refrigerant spray pump (6) is provided with a spray nozzle or a spray hole (15), and sucks a refrigerant liquid sprayed from the spray nozzle or the spray hole and collected at the bottom of the evaporator and sends the liquid to the spray nozzle. A refrigerant circulation shut-off valve (23a, 23b) is inserted and connected to each of the suction-side pipe and the discharge-side pipe of the refrigerant spray pump, and is provided in the suction-side pipe. A branch pipe is provided in an upstream pipe line of the refrigerant circulation shutoff valve (23a), a cleaning circuit connection closing valve (24a) is connected to a tip of the branch pipe, and a refrigerant pipe provided in the discharge side pipe line. And the branch pipe is provided on the downstream side pipeline ring shut-off valve (23b), characterized in that the washing circuit connecting the stop valve at the tip (24b) is connected. According to the device of the eleventh aspect described above, the first aspect
And the effect can be fully exhibited.

[0018]

FIG. 1 is a system diagram showing one embodiment of the present invention. In this embodiment, since the spray nozzle or spray hole (hereinafter simply referred to as a spray nozzle) 15 of the conventional absorption type refrigerator shown in FIG. Then, the spray nozzle 15 was washed to restore the refrigerating ability.
It is an example. (Refrigeration capacity 500 refrigeration tons, operating years 20
Year). In FIG. 1, the right half without the evaporator 4 is:
This is the same as FIG. 1 (conventional example) described above. In FIG. 3 (conventional example), a suction-side pipe of the refrigerant spray pump 6 and a discharge-side pipe of the refrigerant spray pump 6 are cut off.
Remove the refrigerant spray pump 6. The above-mentioned separation may be cutting or removal (for example, of a pipe joint). For each of the two separated pipes, b. Evaporator 4
As shown in FIG. 1, an open / close valve 23 is attached to the cut end of the pipe on the side communicating with the lower refrigerant tank 5, and the cut end is closed. B. Spray duct 8 provided with spray nozzle 15
The cut-off end of the pipe line on the side communicating with is closed by attaching a sealing plate 20, a branch pipe line is attached, and the discharge port of the cleaning liquid circulation pump 19 is connected via the on-off valve 25 and the flexible hose 22. Connect to

The on-off valve 23 has a flexible hose 2
1, the on-off valve 24 and the flexible hose 16 are connected, and piping is performed so that the liquid in the refrigerant tank 5 at the bottom of the evaporator 4 can be discharged. By applying the method of the present invention, the evaporator 4
Prior to circulating and cleaning the spray nozzle 15 in the inside with a cleaning agent, the refrigerant (water) and the absorbing medium solution (the concentrated lithium bromide aqueous solution 13 and the dilute lithium bromide aqueous solution 14) forming the absorption cycle are taken out of the machine. Must be recovered. However, since the inside of the refrigerant circulation system is at a high vacuum, the fluid in the device does not flow out of the device only by providing the outflow path (in contrast, air is sucked vigorously). The inflow of air is extremely undesirable because it corrodes the interior of the equipment. Therefore, using an appropriate means (not shown), the refrigerant and the absorbing medium solution are recovered outside the machine while the inert gas (nitrogen in the present embodiment) flows into the refrigerant circulation system. At this time, the nitrogen gas pressure was set slightly higher than the atmospheric pressure to allow the liquid remaining in the pipe to flow out of the machine,
It is convenient to operate such that the residual liquid is blown off with the nitrogen gas. The recovered refrigerant and the absorbing medium solution are each placed in a plastic container, and the space in contact with the liquid surface is filled with nitrogen gas and temporarily stored.

The cleaning liquid circulation tank 17 containing the cleaning liquid is
The cleaning liquid is temporarily installed beside the absorption refrigerator, and the cleaning liquid is sucked and discharged by the cleaning liquid circulation pump 19 and sprayed from the spray nozzle 15, and the cleaning liquid accumulated in the refrigerant tank 5 below the evaporator 4 is the cleaning liquid. It flows down to the circulation tank 17,
The fluid is circulated as described above. Next, the composition of the cleaning solution will be described. The constituent materials of the refrigerant circulation system of the absorption refrigerator are mainly iron-based alloys and copper-based alloys. Therefore, the foreign substances adhering to the nozzle are mainly composed of corrosion products of these metallic materials. Therefore, the conditions required for the cleaning liquid are (a) not to react violently with these metal materials, and (b) to dissolve corrosion products of these metal materials. There are "hydrochloric acid, sulfuric acid, nitric acid, or similar inorganic acids" and "oxalic acid, malonic acid, succinic acid, or similar organic acids" that satisfy the above conditions (a) and (b). It is also possible to prepare a plurality of types of acids.

Since the above-mentioned acidic chemicals have a non-zero corrosiveness to the metal material constituting the refrigerant circulation system, it is desirable to add a corrosion inhibitor. Carboxylic acids, straight-chain hydrocarbon compounds, amines, azoles, and the like are effective as agents for suppressing corrosion of iron and steel materials, copper, and copper alloys. It is also possible to mix and use a plurality of these corrosion inhibitors. Furthermore, since the work of dissolving metal salts with an acidic aqueous solution is an electrochemical reaction,
In order to promote the dissolution of the metal salt (adhering foreign matter) and / or to suppress the corrosion of the metal ingot, it is desirable to use a potential control agent in combination. In this regard, a known reducing potential control agent can be applied. Known reducing potential control agents include an inorganic drug and an organic drug, and an organic potential control agent having a low risk of side effects (promotion of corrosion) is more preferable.

In this embodiment (FIG. 1), an acidic (pH 1) aqueous solution containing sulfuric acid and oxalic acid as main components and a commercially available amine-based corrosion inhibitor (inhibitor) and a commercially available reducing potential control agent is prepared. 200 liters thereof were used as a cleaning agent. While the cleaning agent is circulated as indicated by arrows b to f in FIG. 1, the nitrogen pressure in the apparatus is kept at approximately 1 atm.
If this is too high, the operation of feeding the cleaning liquid into the machine is not easy, and if it is too low, the risk of air being mixed into the machine increases. In this example, the spray pressure was reduced to -100 mmHg because of clogging due to operation for 20 years, and the spray pressure could be restored to -400 mmHg (the same level as a new product) by circulating cleaning for 2 hours. After circulating the acidic cleaning solution as described above,
After draining this washing solution, the remaining solution must be neutralized and washed with water. The discharge of the cleaning liquid is performed by setting the nitrogen gas inside the apparatus to a pressure higher than the atmospheric pressure, and circulating 200 liters of a 3% by weight sodium hydroxide aqueous solution for 20 minutes by the same or similar operation as circulating the cleaning liquid. After
The process was completed after confirming that the pH of the circulating fluid had reached 7.5 using litmus paper. Then, the cleaning liquid circulation tank 1
200 liters of clean water was placed in 7 and circulated for 10 minutes by the same operation as in the washing, and then discharged. 200 liters of soft water prepared in advance were circulated by the same operation and washed with finish water. The residual liquid of the finish washing is completely removed by raising the nitrogen gas pressure.

As described above, pickling circulation, neutralization circulation,
After completing the four steps of water circulation and soft water circulation, the injection of nitrogen gas is stopped, and a vacuum pump (not shown), which is an accessory device of the absorption refrigerator, is operated to cut the inside of the refrigerant circulation system.
A high vacuum of 740 mmHg was applied, the refrigerant and the absorbing medium solution which had been collected and stored temporarily were sealed in the machine again, and the vacuum pump was operated to reduce the machine pressure to -7.
After confirming that the pressure reached 40 mmHg, a trial operation was performed. In this test operation, it was confirmed that the spray pressure of the refrigerant was restored to -400 mmHg as described above.

In the embodiment described above with reference to FIG. 1, piping is provided as shown in FIG. 1 for temporary repair, and after cleaning the spray nozzle, the piping is restored to that before repair. However, in order to quickly and easily clean the next spray nozzle, it is meaningful to leave a part of the piping. It is also desirable to provide only the connection portion of the pipe for nozzle cleaning from the beginning of the production of the new machine. If nozzle cleaning can be performed quickly and easily,
The spray pressure of the refrigerant is -100 mmHg as in the above example.
It is possible to always operate with the same refrigeration performance as a new one without leaving it until it has dropped and without using nozzle cleaning as part of regular maintenance. FIG. 2 is a schematic system diagram of a nozzle cleaning device (function recovery device) created based on the above considerations. The portion indicated by the reference symbol W is a cleaning circuit, which is connected during regular maintenance and is usually removed. The portion indicated by reference numeral M is a refrigerant circuit, which is used during normal operation. Referring to FIG. 2, when the refrigerant circulation shut-off valves 23a and 23b are opened and the cleaning circuit connection shut-off valves 24a and 24b are closed, it functions in the same manner as the conventional absorption type refrigerator shown in FIG. It is understood that. Further, the closing valves 24a and 24b for connecting the cleaning circuits are provided.
In consideration of a state in which the refrigerant circulation shut-off valves 23a and 23b are closed when the nozzle cleaning device is opened, it is understood that it functions similarly to the nozzle cleaning device (performance recovery device) shown in FIG.

When the apparatus shown in FIG. 2 is prepared at the time of manufacture of a new product, it is necessary to provide an upstream side (a suction side) of the refrigerant spray pump 6.
And the downstream side (discharge side) of the refrigerant circulation shutoff valve 23 respectively.
a and 23b, and a branch pipe line is provided on each of the upstream and downstream sides of the refrigerant circulation shutoff valve 23a.
It is only necessary to attach b and keep it closed. Practical effects of such a configuration are as follows. The applicant of the present invention is a technical service company entrusted with the maintenance and management of the installed absorption refrigerator, and the present inventor is an employee thereof. From this standpoint, in FIG. 3, a symbol W is enclosed by a chain line, and a tank, a pump, and a hose are loaded on a service car. Rated refrigeration performance can be exhibited. In this case, since one set of pump, tank and hose can cope with a large number of absorption refrigerators, it can also contribute to social demands for resource saving. Also, from the point of view of users of absorption chillers, there is no need to keep separate equipment in the machine room where the absorption chiller is installed, and it is possible to have the refrigeration function maintained as new at a low cost. it can.

[0026]

As described above, according to the first embodiment of the present invention, according to the method of the present invention, even if the evaporator is not cut and exposed, the evaporator can be opened outside the case of the refrigerator. Cleaning the spray nozzle remotely using the cleaning liquid circulation tank or cleaning liquid circulation tank provided in
Performance can be restored. According to the method of the present invention, the spray nozzle deposit containing both the iron-based corrosion product and the copper-based corrosion product can be effectively dissolved and removed by using an acidic solution prepared by mixing a plurality of types of chemicals. Can be. According to the method of the present invention, corrosion products deposited on the spray nozzle can be efficiently dissolved and removed, and in addition, there is a possibility that a problem such as corrosion of a metal material constituting a refrigerant circulation system may occur. There is no. According to the method of the present invention, there is no fear that the inner surface of the metal container or the metal pipe constituting the spray system is oxidized and corroded by air. According to the method of the fifth aspect, it is possible to quickly, easily, and completely shut off the contact of the internal space of the refrigerant circulation system with the air. According to the sixth aspect of the present invention, the deposits on the spray nozzle can be washed away without fear of mixing the cleaning agent into the refrigerant and the absorbing medium solution. According to the invention method of claim 7,
The neutralizer waste liquid can be discharged to the river. That is, even if the present invention is applied, if a slightly acidic neutral solution having a pH of 6 or a slightly alkaline neutral solution having a pH of 8 remains in the circulation system, it is not possible to restart the refrigeration cycle by directly injecting the refrigerant or the absorbing medium solution. Since it is completed, it must be further washed with water, etc., but the extracted neutralizer waste liquid (pH 6 to 8) can be discharged to the river. According to the invention method of claim 8,
The inside of the evaporator and other constituent devices can be efficiently and completely returned to neutral, so that there is no problem in restarting the refrigeration cycle. According to the ninth aspect of the present invention, the cleaning liquid can be circulated in the spray system in a state where the internal pressure and the atmospheric pressure are balanced, and the cleaning liquid can be quickly and easily discharged out of the apparatus. . Claim 10
According to the method of the invention, the spray nozzle can be cleaned with the chemical solution without making a major modification to the existing absorption refrigerator and without cutting the evaporator. According to the apparatus of the eleventh aspect, the method of the first aspect can be easily implemented, and its effect can be sufficiently exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram showing one embodiment of the present invention.

FIG. 2 is a schematic system diagram in an embodiment different from FIG. 1 described above.

FIG. 3 is a system diagram showing a conventional example of an absorption refrigerator.

FIG. 4 is an enlarged sectional view of the vicinity of a spray nozzle in the conventional example shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... High temperature regenerator, 2 ... Low temperature regenerator, 3 ... Condenser, 4 ... Evaporator, 5 ... Refrigerant tank, 6 ... Refrigerant spray pump, 8 ...
Spray duct, 9 ... absorber, 15 ... spray nozzle,
17 cleaning liquid circulation tank, 19 cleaning liquid circulation pump, 2
0: sealing plate, 23a, 23b: refrigerant circulation shut-off valve, 24
a, 24b: shut-off valve for connecting the washing circuit, 26: suction pipe, 2
7 ... Filter.

Claims (11)

[Claims] 1. An absorption refrigerator using water as a refrigerant and lithium bromide as an absorption medium. A method for restoring the performance of a spraying device for spraying a refrigerant when foreign matter adheres and accumulates and deteriorates. The method for recovering the performance of an absorption refrigerator according to any one of claims 1 to 4, wherein the foreign matter is removed by chemically cleaning the refrigerant distribution system with a chemical solution. 2. The method according to claim 1, wherein the chemical used for the chemical cleaning is an acidic aqueous solution comprising two or more chemicals. 3. The acidic aqueous solution contains, as a main component, at least one of hydrochloric acid, sulfuric acid, nitric acid or an inorganic acid similar thereto, and oxalic acid, malonic acid, succinic acid or an organic acid similar thereto. The method according to claim 2, further comprising at least one of a corrosion inhibitor and a potential control agent. 4. The method for recovering the performance of an absorption refrigerator according to claim 1, wherein, when the spraying system of the refrigerant is washed with a chemical, air is not brought into contact with the inner surface of the spraying system. 5. The method according to claim 1, wherein the cleaning is performed in a state where the internal space of the refrigerant circulating system of the absorption chiller is filled with an inert gas so that air does not contact the inner surface of the spraying system. 4. The method for recovering performance of an absorption refrigerator described in 4. 6. When the spraying system is washed with the chemical solution, the refrigerant and the absorbing medium solution are recovered from the refrigerant circulating system of the absorption chiller beforehand outside the refrigerant circulating system and temporarily stored therein. The method according to claim 1, wherein after the cleaning and rinsing of the chemical solution in the machine and the washing and removal of the chemical solution are completed, the cleaning solution is discharged outside the machine, and then the stored refrigerant and the absorbing medium solution are injected into the refrigerant circulating system. The described method of restoring the performance of the absorption refrigerator. 7. The spray system is washed with the acidic aqueous solution, and thereafter, an alkaline neutralizing agent solution is circulated to neutralize and remove the remaining acidic aqueous solution.
3. The method according to claim 2, wherein the neutralization operation is terminated after detecting that the value becomes substantially neutral to zero. 8. After performing a neutralization operation until the inside of the refrigerant spraying system reaches pH 6.0 to 8.0, the neutralizing agent solution is discharged and clean water is introduced, and the clean water is circulated in the spray system. After the cleaning, the cleaning wastewater of the cleaning water is discharged out of the machine, the soft water is flown into the refrigerant circulation system to perform the finish washing, and the finished washing wastewater is discharged outside the machine. 7. The method for recovering performance of an absorption refrigerator described in 7. 9. When circulating the cleaning liquid by filling the refrigerant circulation system with an inert gas, the cleaning is performed while keeping the gas pressure in the machine substantially equal to the atmospheric pressure, and the chemical liquid cleaning and neutralizing agent are used. After the washing and the water washing are completed, the gas pressure is raised above the atmospheric pressure to release the pressure of the inert gas to the outside of the machine. 6. The method according to claim 5, wherein the part is discharged outside the machine. 10. A washing liquid circulation tank (17) is provided outside the refrigerant circulation system path of the absorption refrigerator when washing the spraying system of the refrigerant with the chemical liquid, and the washing liquid is put in the tank, and the washing liquid is put in the tank. It is sucked and pumped by a washing liquid circulation pump (19), and is sprayed from a spraying device (15) originally provided in the evaporator of the absorption type chiller / heater. The washing water accumulated in the refrigerant tank (5) of the washing liquid circulation tank (1)
The method according to claim 1, wherein the cleaning liquid circulation pump (19) guides the cleaning liquid to a state in which the cleaning liquid can be sucked by the cleaning liquid circulation pump (19). To recover the performance of absorption chillers. 11. An absorption refrigerator using water as a refrigerant and lithium bromide as an absorption medium, wherein an evaporator (4) is provided with a spray device (15) for injecting a refrigerant liquid. And a refrigerant spray pump (6) for sucking refrigerant liquid ejected from the spraying device and collected at the bottom of the evaporator and feeding the liquid to the spraying device. A refrigerant circulation shut-off valve (23a, 23b) is inserted and connected to each of the discharge side pipeline and the refrigerant circulation shut-off valve (2) provided on the suction side pipeline.
A branch pipe is provided in the upstream pipe of 3a), a cleaning circuit connection closing valve (24a) is connected to the tip of the branch pipe, and a refrigerant circulation shut-off valve (23) provided in the discharge pipe.
A performance recovery device for an absorption refrigerator, wherein a branch pipe is provided in a downstream pipe line of b), and a closing valve (24b) for connecting a washing circuit is connected to a tip of the branch pipe.