JP3169758B2 - Absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerator, and more particularly to an absorption refrigerator capable of automatically dissolving and adding a corrosion inhibitor having low solubility.

[0002]

2. Description of the Related Art Conventionally, in an absorption refrigerator using an aqueous solution of a lithium salt as an absorption solution, the corrosion of the device is severe, so that a corrosion inhibitor has been added to prevent the corrosion. In such a method, it is necessary to keep the corrosion inhibitor in an appropriate range.

[0003] In the case of using lithium molybdate as a corrosion inhibitor, the solubility in an absorbing solution is about 200 ppm, and it takes a lot of time to directly dissolve in an absorbing solution because it is dissolved little by little in a large amount of solution. is there. Also,
Although a method has been proposed in which a corrosion inhibitor is placed directly in the lower part of the absorber (Japanese Patent Laid-Open No. 52-140049), this method cannot control the concentration of the corrosion inhibitor.
At the time of shutdown, there was no possibility of formation of a precipitate or detection of the case where the precipitate disappeared.

[0004]

DISCLOSURE OF THE INVENTION In view of the above prior art, the present invention relates to an absorbent which can automatically add a low solubility corrosion inhibitor such as molybdate as an aqueous solution and can maintain the concentration of the corrosion inhibitor within an appropriate range. It is an object to provide a refrigerator.

[0005]

According to the present invention, there is provided a regenerator, an absorber, an evaporator, a condenser, and a solution passage and a refrigerant passage connecting them, and a solution pump and a refrigerant pump. has, water as a main component of the refrigerant, using a salt solution in the absorption solution, in the absorption refrigerating machine using a low solubility molybdate to rot <br/>蝕抑suppressant, possess an aqueous solution of said corrosion inhibitor An inhibitor tank is provided, and the tank and the solution passage on the solution pump suction side are connected by a solution pipe having a solution valve, and the corrosion inhibitor per unit time per unit time from the tank is provided.
Set the amount to be added and, based on the set value,
Adjustment of added acceleration corrosion inhibitor to control the opening and closing times of the liquid valve
It is provided with a machine configuration.

[0006] In the absorption refrigerating machine, the adjustment mechanism of the hydrogenation <br/> acceleration of corrosion inhibitors is good is a mechanism for controlling as example if 1sec open / min. It is preferable that the solution valve in the solution pipe has a mechanism that opens and closes only during operation of the refrigerator while the solution pump is operating, and that closes the other times.

Further, when the operation is started and the operation is started from a state in which the corrosion-resistant coating is not formed, the control mechanism is such that the addition speed is initially increased and gradually decreases with the operation time.
For example, it is preferable to control the addition rate to decrease gradually with the operation time during which the heat source is added to the regenerator, or to gradually decrease the addition rate with the operation time when the regenerator temperature exceeds a predetermined temperature.

As described above, according to the present invention, as the corrosion inhibitor in the refrigerator decreases, the concentration of the corrosion inhibitor in the refrigerator is maintained within a predetermined range by adding the corrosion inhibitor with an aqueous solution to add the corrosion inhibitor. It is. In order to maintain the corrosion inhibitor in a predetermined range in this manner, the R of the operation panel of the refrigerator is
The OM may be provided with an area for storing the addition rate or a schedule value or a set value corresponding to the addition rate, and the addition rate may be controlled based on the area. Also, the present invention
Although described as an absorption refrigerator, in addition to the refrigerator, the invention can also be applied to an absorption-type cooling / heating machine, a cooling / heating water machine, or the like of a system in which water is used as a refrigerant and a cooling solution is obtained by using a salt solution as an absorbing solution. Naturally, it is included in the invention.

[0009]

Since the corrosion inhibitor lithium molybdate has a solubility of 300 g / liter or more in water at room temperature, it is prepared as an aqueous solution of lithium molybdate and injected easily into the solution of the refrigerator. Can be added. However, if a large amount is added at a time, lithium molybdate will precipitate, so it is preferable to add a small amount at a time. In the present invention, it is added little by little over a long period of time.

[0010] Basically, if the solution is not flowing, it precipitates and precipitates over a long period of time, so it is added during the operation of the solution pump. Since the higher the temperature, the higher the solubility, it is preferable to add and diffuse well during operation while adding a heat source. FIG. 2 shows the relationship between the operating time and the lithium molybdate reduction rate. As described above, the refrigerator consumes a large amount of the corrosion inhibitor until a film of triiron tetroxide is formed on the surface of the steel material during the initial operation. After that, the consumption amount gradually decreases. However, since the solubility of the corrosion inhibitor is low, it is not possible to initially add a large amount of the corrosion inhibitor. Therefore, it is desirable to add the corrosion inhibitor so as to correspond to this consumption amount.

[0011] After a certain period of time, it is consumed to repair the triiron tetroxide film and becomes a substantially constant amount of consumption. Depending on whether there is a case, extreme operation without a corrosion inhibitor, or whether there has been a crystallization accident of the absorbent, even if the refrigerator has the same design and the same size. Has variation. Therefore, if an approximate consumption amount of the subsequent consumption amount is set for each machine, the operation can be performed without causing the inhibitor concentration to deviate too much from the predetermined concentration. As described above, it is preferable that the excess and deficiency be manually adjusted about once a year, assuming that the density is approximately constant in the rough setting.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described specifically with reference to the drawings, but the present invention is not limited thereto. Embodiment 1 FIG. 1 is a schematic configuration diagram showing an example of an absorption refrigerator of the present invention. In FIG. 1, E is an evaporator, A is an absorber, G is a regenerator, C is a condenser, Hs is a solution heat exchanger, 1-4 are solution passages, 5 is a solution passage, 6 is a solution pump, 6 is a refrigerant pump, and 7- 9 is a refrigerant passage.

In the present invention, an inhibitor tank 10 for storing an aqueous solution of a corrosion inhibitor is provided.
And the solution passage 1 are connected by a solution pipe 11 having a solution valve 12, and the solution valve 12 is suppressed by a control panel 13 so that the addition rate is adjusted. In addition, the inhibitor tank 10
And the evaporator E are connected by a balance pipe 14 having a valve 15 to adjust the pressure in the tank. Further, in FIG. 1, a cooling water pipe 16 passes through the evaporator E, and a cooling water pipe 18 passes through the absorber A and the condenser C.
The regenerator G is provided with a steam heating pipe 19, and the regenerator G is provided with an overflow pipe 17 from the absorber A.

Then, in the operation of the absorption refrigerator,
The dilute solution having absorbed the refrigerant passes through the pipe 1 from the absorber A, passes through the heated side of the solution heat exchanger Hs by the pump 5, and is introduced into the regenerator G. In the regenerator G, the concentrated solution obtained by evaporating the refrigerant from the dilute solution by heating with the heating steam 19 passes through the pipe 3, passes through the heating side of the solution heat exchanger, and flows through the absorber A.
And absorbs the refrigerant.

On the other hand, the evaporated refrigerant is cooled by the cooling water in the condenser C and condensed, and enters the evaporator E through the pipe 7.
In the evaporator E, the refrigerant is circulated by the refrigerant pump 6 through the pipes 8 and 9 to evaporate.
, And the cold water 16 is cooled and provided for cooling. In such a cooling operation, according to the present invention, the solution valve 12 is opened and closed by a command from the control panel 13 to add and replenish the aqueous solution of the corrosion inhibitor from the inhibitor tank 10 into the solution from the solution passage 1. ing.

[0016]

According to the present invention, an aqueous solution of the low solubility corrosion inhibitors, continuously be added by adjusting mechanism for controlling the added acceleration of that, the concentration of the freezer corrosion inhibitor constant concentration Can hold.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of an absorption refrigerator of the present invention.

FIG. 2 is a graph showing a relationship between an operation time and a reduction rate of lithium molybdate.

[Explanation of symbols]

E: evaporator, A: absorber, G: regenerator, C: condenser, H
s: solution heat exchanger, 1-4: solution passage, 5: solution pump, 6: refrigerant pump, 7-9: refrigerant passage, 10: inhibitor tank, 11: solution piping, 12: solution valve, 13: control Panel, 14: balance pipe, 15: balance valve, 16: cold water pipe, 17: overflow pipe, 18: cooling water pipe, 1
9: Steam heating tube

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Osamu Inoue 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Works Co., Ltd. (56) References JP-A-52-140049 (JP, A) 7-18169 (JP, U) JP 49-8985 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 15/00 F25B 15/00 306 F25B 47/00

Claims (4)

(57) [Claims] 1. A regenerator, an absorber, an evaporator, a condenser, a solution passage and a refrigerant passage connecting them, a solution pump and a refrigerant pump, wherein water is a main component of the refrigerant, and the absorption solution is a salt solution. using, in the absorption refrigerating machine using a low solubility molybdate in corrosion inhibitors, the inhibitor tank carrying an aqueous solution of said corrosion inhibitor is provided, a solution valve with a solution passage of the tank and the solution pump suction And the addition of the corrosion inhibitor from the tank per unit time.
Set the amount of solution and set the solution in the solution pipe based on the set value.
Absorption refrigerating machine, characterized in that a regulator <br/> structure of added acceleration corrosion inhibitor to control the opening and closing times of the valves. 2. A solution valve in said solution pipe, refrigerator absorption refrigerating machine according to claim 1 Symbol placing the solution pump except during operation, characterized in that it has a mechanism for closed in operation. Adjusting mechanism 3. Attachment acceleration of the corrosion inhibitor, the absorption refrigerating machine according to claim 1 or 2, wherein the is a mechanism for controlling to sequentially decreases with operating time. 4. A control mechanism added acceleration of the corrosion inhibitor, claim 1, wherein the regenerator solution temperature is a mechanism for controlling to sequentially decreases with operating time exceeds a predetermined temperature Or the absorption refrigerator according to 2.