JP2000329603A - Mechanism for detecting solution level in high pressure regenerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mechanism for detecting the solution level in a high pressure regenerator in which abnormal detection of the solution level is not determined when it is not required but determined only when it is required. SOLUTION: A solution level detector 110 communicates with a high pressure regenerator and solution Y intrudes therefrom into the detector 110. Solution level can be detected by judging conducting/nonconducting state between a common electrode rod 112a and detection electrode rods 112b-112e. A decision is made that the solution level is abnormal based on the detection electrode rods when the detection electrode rods detecting a relatively high solution level are in the conducting state but the detection electrode rods detecting a relatively low solution level are in the nonconducting state and the solution temperature detected by a temperature sensor 150 is equal to or higher than a set level.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a solution level detecting mechanism provided in a high-pressure regenerator for detecting the solution level of a high-pressure regenerator of an absorption refrigerator. A solution level detection error can be determined only when a solution level detection error occurs when necessary, without determining a detection error.Thus, it is necessary to reliably detect the solution level and control the stable operation of the absorption refrigerator. It is devised so that it can be done.

[0002]

2. Description of the Related Art An absorption refrigerator is a refrigerator using water as a refrigerant, a lithium bromide solution as an absorbent, and gas fuel, oil fuel or steam as an energy source. This absorption refrigerator is
The evaporator, the absorber, the regenerator, and the condenser are mainly constituted. The inside of the evaporator and the absorber is maintained in a high vacuum (absolute pressure is 6 to 7 mmHg).

[0003] In the evaporator, the refrigerant (water) sent by the refrigerant pump is sprayed toward an evaporator tube through which cold water (12 ° C) flows, whereby the refrigerant is heated to become refrigerant vapor. That is, since the evaporator is a high vacuum vessel, water (refrigerant) boils at about 4 to 6 ° C. and evaporates, so that cold water at 12 ° C. can be used as the heat source water.

[0004] Then, the temperature of the cold water is reduced (to 7 ° C) by the latent heat of evaporation given to the refrigerant (water), and the cold water leaves the evaporator. The cold water whose temperature has dropped (to 7 ° C.) is sent to a cooling device or the like (cooling load) of the building and used for cooling. The temperature of the cold water used for cooling rises to 12 ° C., and flows again into the evaporator tube of the evaporator.

[0005] In the absorber, the refrigerant vapor generated in the evaporator is absorbed by the lithium bromide solution. The lithium bromide solution (hereinafter referred to as “lithium bromide dilute solution”) that has absorbed water and has become less concentrated is collected at the bottom of the absorber. In this absorber, the latent heat of condensation when the refrigerant vapor is absorbed by the lithium bromide solution and changes from gas (water vapor) to liquid (water), and when the concentration of the lithium bromide solution becomes thin due to the absorption of moisture. Since heat of dilution is generated, these heats are removed by cooling water (circulated in a different system from the above “cold water”). Note that the lithium bromide solution is a substance that is rich in hygroscopicity and suitable for absorbing the refrigerant vapor, since the water vapor partial pressure is lower than the saturated vapor of water.

[0006] In the regenerator, the dilute lithium bromide solution sent from the absorber is heated. For this reason, a part of the refrigerant in the lithium bromide dilute solution is evaporated and vaporized, and the solution becomes a concentrated lithium bromide solution (hereinafter, referred to as a “lithium bromide concentrated solution”). The lithium bromide concentrated solution whose concentration has been raised to the original state is sent to the absorber and absorbs the refrigerant vapor again.
On the other hand, the evaporated refrigerant vapor is sent to the condenser.

In the actual machine, a double-effect absorption refrigerator having a regenerator arranged in two stages is employed for the purpose of increasing heat efficiency and reducing heating energy. In this double-effect absorption refrigerator, as a regenerator, a high-pressure regenerator that heats a dilute lithium bromide solution by burning supplied fuel (or with supplied steam) and a high-pressure regenerator And a low-pressure regenerator for heating the lithium bromide dilute solution using the high-temperature refrigerant vapor as a heating source.

[0008] In the condenser, the refrigerant vapor sent from the regenerator is cooled by cooling water and condensed and liquefied. The condensed water is supplied again to the evaporator as a refrigerant (water).

Thus, in the absorption refrigerator, the refrigerant (water)
Changes (phase change) with water-steam-water,
The lithium bromide solution changes (concentration solution-dilute solution-concentration solution) (change in concentration). In the process of the above-described phase change (refrigerant) and concentration change (lithium bromide solution), the absorption refrigerator produces cold water by the latent heat of evaporation of water, and absorbs water vapor by the absorption capacity of the lithium bromide solution. Is repeatedly performed in a high vacuum closed system.

In such an absorption refrigerator, by increasing the amount of fuel (or the amount of steam) supplied to the high-pressure regenerator to increase the amount of heating and increasing the concentration of the lithium bromide solution,
The temperature of the cold water exiting the evaporator can be reduced.
Conversely, by decreasing the amount of fuel supplied to the high pressure regenerator to reduce the amount of heating and decreasing the concentration of the lithium bromide solution, the temperature of the cold water exiting the evaporator can be increased. Thus, by adjusting the concentration of the lithium bromide solution, the temperature of the cold water is controlled, and the temperature of the cold water flowing out of the evaporator is set to the set temperature (7 ° C.).

By the way, in the absorption refrigerator, the solution level of the lithium bromide solution in the high-pressure regenerator is measured by a solution level detector in order to prevent the boil-off in the high-pressure regenerator and to stably control the circulation amount of the lithium bromide solution. Was detected.

That is, as shown in FIG. 7, in a high-pressure regenerator 40 of an absorption refrigerator, a liquid tank 42 for storing a lithium bromide solution Y is formed above a body 41, and this liquid tank 4
In 2, a plurality of heat transfer tubes 43 are disposed so as to penetrate horizontally. At the lower part of the body 41, a cylindrical furnace tube 44 is formed substantially horizontally. Then, the high temperature combustion gas burned in the furnace tube 44 flows through the heat transfer tube 43 so that the lithium bromide solution Y is heated and concentrated.

A solution level detector 100 is provided in communication with a body 41 of the high-pressure regenerator 40. In this solution level detector 100, as shown in FIG. 8 which is a front view, the detector box 1
The lithium bromide solution Y infiltrates the liquid tank 42 from the liquid tank 42, and the solution level of the liquid tank 42 and the solution level of the detector box 101 are the same. In the detector box 101,
Five electrode rods 102a to 102e are provided. In FIG. 7, the electrode rods 102 a to 102 e are denoted by reference numerals 10.
It is shown as 2.

The electrode rods 102a to 102e are arranged such that the upper portions of the respective electrodes are fixed to the upper plate 101a of the electrode box 101 and extend downward in the electrode box 101.
In addition, the length gradually decreases as the electrode rod 102a shifts from the electrode rod 102a to the electrode rod 102e. The longest electrode rod 102a is a common electrode rod, and the other electrode rods 102b to 102e, which are gradually shortened, are detection electrode rods for solution level detection.

The common electrode rod 102a and each detection electrode rod 1
A voltage is applied by the control unit 200 between the terminals 02b and 102e. Thus, for example, when the solution level is lower than level L0,
The detection electrode rods 102b to 102e are all in a non-conductive state. When the solution level is at the level L1, the conduction between the common electrode rod 102a and the detection electrode rod 102b is in a conductive state. When the solution level is at the level L2, When the solution level is level L3, the common electrode rod 102a and the detection electrode rods 102b, 102c, 102d are brought into conduction between the electrode rod 102a and the detection electrode rods 102b, 102c.
When the solution level is level L4, the common electrode rod 102a and the detection electrode rods 102b, 102c, 102
d and 102e are electrically connected.

The control unit 200 controls each of the electrode rods 102a to 102a to
2e, and detects the conductive / non-conductive state between the common electrode rod 102a and the detection electrode rods 102b to 102e, thereby detecting the solution level of the lithium bromide solution Y.

The solution level detector 100 and the control unit 2
00 constitutes a solution level detection mechanism.

The control unit 200 determines that the detection electrode rod 102b has become non-conductive, and
When it is detected that the solution level becomes lower than the level L0, a control operation for preventing idle heating, for example, a control for stopping the fuel supply to the high-pressure regenerator 40 is performed.

The control unit 200 performs operation control for optimally operating the absorption refrigerator according to the detected solution levels L1 to L4. For example, if the solution level is L1
When the solution level is L2, the supply amount of the lithium bromide solution to the high-pressure regenerator 40 is increased, and when the solution level is L2, the supply amount of the lithium bromide solution to the high-pressure regenerator 40 is set to a steady amount. When it is L3, the operation control is performed such that the supply amount of the lithium bromide solution to the high-pressure regenerator 40 is reduced, and when the solution level becomes L4, the supply of the lithium bromide solution to the high-pressure regenerator 40 is stopped. Perform

In the control unit 200, a detection electrode rod (for example, the detection electrode rod 10) for detecting a relatively high solution level is used.
If the detection electrode rod (for example, the detection electrode rod 102c) that detects a relatively lower solution level is in a non-conductive state while the conductive state of 2d) is in a conductive state, the solution level detection abnormality occurs. (Abnormal relation between phases) is determined, an alarm is issued, and operation control is performed to operate the absorption refrigerator to a safe side.

[0021]

The lithium bromide solution Y contains a corrosion inhibitor (inhibitor) for preventing corrosion. This corrosion inhibitor is a chromium compound and is dissolved in the lithium bromide solution when the absorption refrigerator is operated and the temperature of the lithium bromide solution is high.
When the operation of the absorption refrigerator is stopped and the temperature of the lithium bromide solution decreases (for example, when the temperature becomes 75 ° C. or lower), the lithium bromide solution may be deposited and adhere to the surfaces of the electrode rods 102a to 102e.

Since the deposited corrosion inhibitor is an insulating material, if the corrosion inhibitor adheres to the entire surface of the electrode rods 102a to 102e, the solution level of the lithium bromide solution Y cannot be accurately detected. Sometimes. That is, even if the electrode rods 102a to 102e are immersed in the lithium bromide solution, the electrode rods 102a to 102e do not become conductive, or the above-described solution level detection abnormality (abnormal phase relationship) occurs. In some cases, the machine could not be operated stably.

At the beginning of the operation, even if the above-mentioned solution level detection abnormality (abnormal phase relationship) occurs due to precipitation and adhesion of the corrosion inhibitor, the operation is continued and the temperature of the lithium bromide solution Y rises. Then, the corrosion inhibitor deposited and adhered to the electrode rod begins to melt, and thereafter, the solution level detection abnormality (phase relation abnormality) caused by the deposition and adhesion of the corrosion inhibitor disappears.

Therefore, even if the above-described phase relationship abnormality is detected at the beginning of the operation, that is, during the period when the temperature of the lithium bromide solution Y is low (several tens of minutes from the start of the operation),
After that, when the temperature of the lithium bromide solution Y rises, a situation in which the abnormal relation between the phases is eliminated sometimes occurs frequently. Such a situation, on the contrary, hinders stable operation and deteriorates operation controllability. That is, when the solution level detection abnormality (phase relation abnormality) is determined at the beginning of operation and the operation of the absorption chiller is controlled to a safe side, the solution level detection abnormality (phase relation abnormality) disappears for a while, and it is attempted to return to normal operation. Then, the controllability deteriorates.

In view of the above prior art, the present invention provides a solution level detection mechanism of a high-pressure regenerator that can determine a solution level detection abnormality only when necessary without unnecessary determination of a solution level detection abnormality. The purpose is to:

[0026]

According to the present invention, there is provided a detector box installed in communication with a high-pressure regenerator of an absorption refrigerator, and into which a solution in the high-pressure regenerator has entered. And, the upper electrode is fixed to the upper plate of the detector box and is a plurality of electrode rods having a different length in a stepwise manner and arranged in a state of extending downward inside the detector box, A voltage is applied between the common electrode rod, which is the longest electrode rod among the electrode rods, and the detection electrode rod, which is the remaining electrode rod, and each of the detection electrode rods depends on the level of the solution in the detector box. A liquid level detector that detects a solution level by gradually becoming conductive, a temperature detecting member that detects the temperature of the solution in the detector box, and conduction of each detection electrode rod of the solution level detector. Detect solution level based on condition, but relatively high Detecting the state in which the detection electrode rod for detecting the solution level is relatively non-conductive while the detection electrode rod for detecting the liquid level is in the conductive state, and detecting the temperature. A control unit that, when detecting that the temperature of the solution detected by the member is equal to or higher than a preset temperature, determines that the detection of the solution level obtained based on the conduction state of each detection electrode rod is abnormal. It is characterized by comprising.

The structure of the present invention comprises a detector box which is installed in communication with a high-pressure regenerator of an absorption refrigerator and in which the solution in the high-pressure regenerator has entered, It consists of a plurality of electrode rods of different lengths that are fixed to the plate and are arranged in a state of extending downward inside the detector box, and are the longest electrode rods among the electrode rods. A voltage is applied between the common electrode rod and the detection electrode rod which is the remaining electrode rod, and each detection electrode rod becomes conductive in a stepwise manner according to the level of the solution in the detector box. A solution level detector for detecting a solution level, and a solution level detector for detecting a solution level based on a conduction state of each detection electrode rod of the solution level detector, while a detection electrode rod for detecting a relatively high solution level is in a conduction state. But relatively lower solution When the state in which the detection electrode rod for detecting the bell is in a non-conductive state is detected, and when it is detected that a predetermined period of time has elapsed from the time when the absorption refrigerator started operation, And a control unit that determines that the detection of the solution level obtained based on the conduction state of the detection electrode rod is abnormal.

Further, the configuration of the present invention comprises a detector box which is installed in communication with a high-pressure regenerator of an absorption refrigerator and in which the solution in the high-pressure regenerator has penetrated, It consists of a plurality of electrode rods of different lengths that are fixed to the plate and are arranged in a state of extending downward inside the detector box, and are the longest electrode rods among the electrode rods. A voltage is applied between the common electrode rod and the detection electrode rod which is the remaining electrode rod, and each detection electrode rod becomes conductive in a stepwise manner according to the level of the solution in the detector box. A solution level detector for detecting a solution level, a temperature detecting member for detecting the temperature of the solution in the detector box, and a solution level detector for detecting the solution level based on the conduction state of each detection electrode rod of the solution level detector. Inside the high-pressure regenerator based on the operation state of the absorption refrigerator The result obtained by inferring whether the solution level of the solution is increasing or decreasing is inconsistent with the increase or decrease in the solution level obtained by detecting the conduction / non-conduction state of each detection electrode rod over time, And, when it is detected that the temperature of the solution detected by the temperature detecting member is equal to or higher than a preset temperature, the detection of the solution level obtained based on the conduction state of each detection electrode bar is abnormal. And a controller for determining.

Further, the structure of the present invention is installed in communication with the high-pressure regenerator of the absorption refrigerator, and the detector box into which the solution in the high-pressure regenerator has penetrated, and the upper part of the electrode is the upper plate of the detector box. And a plurality of electrode rods having different lengths in a stepwise manner and arranged in a state of extending downward inside the detector box, and the common electrode being the longest electrode rod among the electrode rods By applying a voltage between the electrode rods and the detection electrode rods as the remaining electrode rods, each detection electrode rod gradually becomes conductive according to the level of the solution in the detector box. A solution level detector for detecting a solution level;
A heating member disposed in the detector box for heating the solution, and detecting the solution level based on the conduction state of each detection electrode rod of the solution level detector, while detecting a relatively high solution level. When the detection electrode rod detects a state in which the detection electrode rod is in a non-conductive state while detecting a relatively lower solution level while the detection electrode rod is in a conductive state,
And a control unit that determines that the detection of the solution level obtained based on the conduction state of each detection electrode bar is abnormal.

According to the present invention, even if a solution level detection abnormality occurs in the initial operation period when the temperature of the solution (lithium bromide solution) is low, the operation is ignored and the operation is continued, and the temperature of the lithium bromide solution rises. If the solution level detection error still occurs (that is, the
Only when the solution level detection error has occurred without being caused by adhesion), it is possible to use operation control that responds to this solution level detection error without any safety problems. It is. In other words, at the beginning of operation, since the temperature of the lithium bromide solution is low, even if a solution level detection abnormality occurs, even if the operation control corresponding to the abnormality is not immediately performed, there is no problem in safety, This is based on the fact that sufficient safety can be ensured even when control is performed in response to abnormalities after the temperature of the lithium bromide solution becomes high.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a solution level detecting mechanism of a high-pressure regenerator according to an embodiment of the present invention will be described in detail with reference to the drawings.

<Overall Configuration and Operation of Absorption Refrigerator>
First, referring to FIG. 1 which is a system configuration diagram,
Schematic configuration of the entire absorption refrigerator according to the present embodiment
The operation will be described together with the operation during the cooling operation. During the cooling operation, the valves V1, V2, V3, V4 are closed (shown in black in the figure), and the valves V5, V11, V
12, V13 and V14 are open (shown in white in the figure).

As shown in FIG. 1, the evaporator 10 and the absorber 2
0 is configured in the same shell (high vacuum vessel).

An evaporator tube 11 is arranged in the evaporator 10. Cold water W1 is supplied to the evaporator tube 11 via a cold water inlet line L1, and the cold water W1 flowing through the evaporator tube 11 is discharged to the outside via a cold water outlet line L2. The refrigerant (water) R pumped by the refrigerant pump P1 via the refrigerant line L11 is:
Sprayed toward the evaporator tube 11. The sprayed refrigerant R takes the latent heat of vaporization from the cold water W1 flowing in the evaporator tube 11, evaporates and vaporizes, and becomes refrigerant vapor r. This refrigerant vapor r flows into the absorber 20 side.

The cold water W1 is heated at a temperature of 12 ° C.
0, cooled by the evaporator tube 11, and discharged from the evaporator 10 at a temperature of 7 ° C. Cold water outlet line L2
The cold water W1 of 7 ° C. coming out of the chiller is used for cooling a building or for a process in a factory. The cooling water W1 used for cooling under a cooling load such as a building cooling condition rises in temperature, reaches a temperature of 12 ° C., and flows into the evaporator 10 again.

An absorber tube 21 is arranged in the absorber 20. Cooling water W2 is supplied to the absorber tube 21 via a cooling water line L3. Then, the lithium bromide concentrated solution Y1 pumped by the solution pump P2 via the solution line L21 is supplied to the absorber tube 21.
Sprayed towards. For this reason, the sprayed lithium bromide concentrated solution Y1 absorbs the refrigerant vapor r flowing into the absorber 20, and its concentration becomes thin. The diluted lithium bromide solution Y3 having a reduced concentration is collected at the bottom of the absorber 20. The heat generated in the absorber 20 is cooled by the cooling water W2 flowing in the absorber tube 21.

The dilute lithium bromide solution Y3 collected at the bottom of the absorber 20 is pumped by the solution pump P3, and is supplied to the valve V5, the low-temperature heat exchanger 30, the solution line L22, the high-temperature heat exchanger 31, and the solution line L23. Through the high-pressure regenerator 4
0 is supplied.

The high-pressure regenerator 40 has a furnace tube and a heat transfer tube housed in its body, and is equipped with a burner. This high pressure regenerator 4
0 indicates that the fuel gas G is supplied via the gas line L31, the valve V21, and the fuel control valve V22,
The fuel gas G is burned to heat the lithium bromide dilute solution Y3. Dilute lithium bromide solution Y supplied to high-pressure regenerator 40
3 is heated and a part of the refrigerant is evaporated and vaporized to form a solution Y2 in lithium bromide having a medium concentration. The solution Y2 in lithium bromide is supplied to the low-pressure regenerator 50 through the solution line L24 and the high-temperature heat exchanger 31.

On the other hand, the refrigerant vapor r evaporated in the high-pressure regenerator 40 is supplied to the low-pressure regenerator tube 51 of the low-pressure regenerator 50 via the refrigerant line L12, and is further supplied to the condenser 60 via the refrigerant line L13. Supplied to Note that the low-pressure regenerator 50 and the condenser 60 are configured in the same shell.

In the low-pressure regenerator 50, a solution Y2 in lithium bromide is supplied via a solution line L24,
The dilute lithium bromide solution Y3 branched from the solution line L22 via the solution line L25 is supplied to the low-pressure regenerator tube 5
Sprayed towards 1. In the low-pressure regenerator 50, the solutions Y2 and Y3 are heated by the low-pressure regenerator tube 51,
A part of the refrigerant evaporates to further increase the concentration of the solution, and a high concentration lithium bromide concentrated solution Y1 is collected at the bottom of the low-pressure regenerator 50. The lithium bromide concentrated solution Y1 is supplied to the absorber 20 again by the solution pump P2.

A condenser tube 61 to which cooling water W2 is supplied by a cooling water line L4 is arranged in the condenser 60. In the condenser 60, the refrigerant vapor r evaporated by the high-pressure regenerator 40 and supplied through the refrigerant line L12, the low-pressure regenerator tube 51, and the refrigerant line L13,
The refrigerant vapor r evaporated by the low-pressure regenerator 50 and flowing into the condenser 60 is cooled and condensed by the condenser tube 61 to become the refrigerant (water) R. This refrigerant R is sent to the evaporator 10 via the refrigerant line L14 due to gravity and a pressure difference. The refrigerant R collected at the bottom of the evaporator 10 is again sprayed toward the evaporator tube 11 via the refrigerant line L11 by the refrigerant pump P1.

In the absorption refrigerator having such a configuration,
The controller 80 controls the opening of the fuel control valve V22 to control the amount of fuel gas G supplied to the high-pressure regenerator 40, thereby controlling the temperature of the cold water W1 sent to the cooling load through the cold water outlet line L2. Can be.

<Characteristic part of the present invention> Next, the characteristic part of the present invention will be described.

<First Embodiment> In the absorption refrigerator, the lithium bromide solution in the high-pressure regenerator 40 is used to prevent the boil-off in the high-pressure regenerator 40 and to stably control the circulation amount of the lithium bromide solution Y. Was detected by a solution level detector.

That is, as shown in FIG. 2, in a high-pressure regenerator 40 of an absorption refrigerator, a liquid tank 42 for storing a lithium bromide solution Y is formed above a body 41, and this liquid tank 4
In 2, a plurality of heat transfer tubes 43 are disposed so as to penetrate horizontally. At the lower part of the body 41, a cylindrical furnace tube 44 is formed substantially horizontally. Then, the high temperature combustion gas burned in the furnace tube 44 flows through the heat transfer tube 43 so that the lithium bromide solution Y is heated and concentrated.

A solution level detector 110 is provided in communication with a body 41 of the high-pressure regenerator 40. In this solution level detector 110, as shown in FIG. 3 which is a front view, the detector box 1
The lithium bromide solution Y infiltrates the liquid tank 42 from the liquid tank 42, and the solution level of the liquid tank 42 and the solution level of the detector box 111 are the same. In the detector box 111,
Five electrode rods 112a to 112e are provided. In FIG. 2, the electrode rods 112 a to 112 e are denoted by reference numerals 11.
It is shown as 2.

The electrode rods 112a to 112e are arranged such that the upper portions of the electrodes are fixed to the upper plate 111a of the electrode box 111 and extend downward in the electrode box 111.
In addition, the length gradually decreases as the electrode rod 112a shifts from the electrode rod 112a to the electrode rod 112e. The longest electrode rod 112a is a common electrode rod, and the other electrode rods 112b to 112e, which are gradually shortened, are detection electrode rods for solution level detection.

Also, as shown in FIG.
A temperature sensor 150 for detecting the temperature of the lithium bromide solution Y is disposed at the bottom of the sensor. This temperature sensor 150
Is sent to the control unit 80.

The common electrode rod 112a and each detection electrode rod 1
A voltage is applied by the control unit 80 between the terminals 12b and 112e. Thus, for example, when the solution level is lower than level L0,
The detection electrode rods 112b to 112e are all in a non-conductive state. When the solution level is at the level L1, the conduction between the common electrode rod 112a and the detection electrode rod 112b is in a conductive state. When the solution level is at the level L2, When the solution level is level L3, the common electrode bar 112a and the detection electrode bars 112b, 112c, 112d are brought into conduction with the electrode bar 112a and the detection electrode bars 112b, 112c.
When the solution level is level L4, the common electrode bar 112a and the detection electrode bars 112b, 112c, 112
d and 112e are electrically connected.

The control unit 80 controls each of the electrode rods 112a to 112
e, and detects the conductive / non-conductive state between the common electrode rod 112a and the detection electrode rods 112b to 112e, thereby detecting the solution level of the lithium bromide solution Y.

The solution level detector 110 and the control unit 8
0 constitutes a solution level detection mechanism.

The control unit 80 determines that the detection electrode rod 112b has become non-conductive, and when it detects that the solution level of the lithium bromide solution Y has become lower than the level L0, A control operation for preventing idle burning, for example, a control for closing the fuel control valve V22 and stopping the supply of fuel to the high-pressure regenerator 40 is performed.

Further, the control unit 80 performs operation control for optimally operating the absorption refrigerator according to the detected solution levels L1 to L4. For example, when the solution level is L1, the supply amount of the lithium bromide solution to the high-pressure regenerator 40 is increased, and when the solution level is L2,
The supply amount of the lithium bromide solution to the high-pressure regenerator 40 is a steady amount, and when the solution level is L3,
Operation control for controlling the solution pump P3 and the like so as to reduce the supply amount of the lithium bromide solution to 0 and stop the supply of the lithium bromide solution to the high-pressure regenerator 40 when the solution level becomes L4. Perform

Further, the control unit 80 controls the detection electrode rod (for example, the detection electrode rod 112) for detecting a relatively high solution level.
d) is in a conductive state, but a detection electrode rod (for example, the detection electrode rod 112c) for detecting a relatively lower solution level is in a non-conductive state,
If the temperature of the lithium bromide solution Y is higher than the set temperature, it is determined that the solution level detection is abnormal (abnormal phase relationship), and an alarm is issued or the absorption refrigerator is operated so as to operate safely. Has control.

Here, among the functions of the control unit 80, a function part for judging an abnormality in solution level detection will be described with reference to FIG. In FIG. 4, the functional blocks described in the control unit 80 only extract and show the functional parts that determine the solution level detection abnormality, and other functional blocks of the control unit 80 are not shown.

As shown in FIG. 4, the open / close information of the fuel control valve V22 is input to the input section IN1, and the fuel control valve V22
Is open, a high-level signal is output from the input unit IN1, and when the fuel control valve V22 is closed, a low-level signal is output from the input unit IN1. Therefore, when the high-pressure regenerator 40 is in a combustion state, the input unit I
A high-level signal is output from N1, and a low-level signal is output from the input unit IN1 in the non-combustion state.

In place of the fuel control valve V22, the combustion of the high-pressure regenerator 40 is directly detected by a sensor, or the status of other members operating according to the combustion of the high-pressure regenerator 40 is detected. A high-level signal is output from the input unit IN1 in the combustion state, and the input unit IN1 is output in the non-combustion state.
May output a low level signal.

The temperature information of the temperature sensor 150 is input to the hysteresis section H, and the temperature of the lithium bromide solution Y in the high-pressure regenerator 40 (in the solution level detector 110) is set to 80 ° C.
If the temperature exceeds 75 ° C., a high-level signal is output from the hysteresis unit H, and a low-level signal is output from the hysteresis unit H when the temperature of the lithium bromide solution becomes 75 ° C. or less. The output of the hysteresis unit H is taken in via the input unit IN2.

The conduction / non-conduction state signals of the detection electrode bars 112b to 112e are taken into the abnormality determination logic R.
The abnormality determination logic R includes input sections IN3 to IN6, NOT gates NOT1 to NOT3, and an AND gate AND1.
To AND6 and an OR gate OR.
The input portions IN3, IN5, IN6 are connected to the electrode rods 112b, 1
A high-level signal is output when 12d and 112e are in a conductive state, and a low-level signal is output when the electrode bars 112b, 112d and 112e are in a non-conductive state.
The input unit IN4 outputs a low-level signal when the electrode bar 112c is in a conductive state, and outputs a high-level signal when the electrode bar 112c is in a non-conductive state.

In this abnormality determination logic R, the detection electrode rod for detecting a relatively high solution level is in a conductive state, but the detection electrode rod for detecting a relatively lower solution level is in a non-conductive state. When it is in the state, it outputs a high-level signal; otherwise, it outputs a low-level signal.

The input section IN1 is connected to the AND gate AND7.
, The output signal of the input unit IN2, and the output signal of the abnormality determination logic R. Therefore, the high-pressure regenerator 40 is in a combustion state (the output signal of IN1 is a high-level signal), and the temperature of the lithium bromide solution Y in the high-pressure regenerator 40 is 80 ° C. or more. (The output signal of IN2 is a high level signal),
In addition, while the detection electrode rod for detecting a relatively high solution level is in a conductive state, the detection electrode rod for detecting a relatively lower solution level is in a non-conductive state (abnormality determination logic). When the output signal of R is at a high level), a high-level signal is output from the AND gate AND7, and in other states, a low-level signal is output.

The timer section T outputs a high-level signal when the state in which the output signal of the AND gate AND7 is at the high level continues for a certain period of time (for example, 20 seconds), and outputs a low-level signal in other states. Output.

When the timer unit T outputs a high level signal, the solution level detection abnormality determination unit 81
It is determined that the solution level detected by 12b-112e is abnormal (abnormal phase relationship), and the operation of the absorption refrigerator is controlled to a safe side.

For this reason, when the temperature of the lithium bromide solution Y is low (75 ° C. or less), for example, at the beginning of the operation of the absorption refrigerator, the corrosion inhibitor is deposited and the electrode rods 112 a to 112 e are formed.
Is attached to the surface, a high level signal (a signal indicating abnormality) is output from the abnormality determination logic R. At this time, since the temperature of the lithium bromide solution is low, a low level signal is output from the input section IN2. A signal is output, and a low level signal is output from AND gate AND7. As a result, when the temperature of the lithium bromide solution Y is low, the solution level detection is not determined to be abnormal even if the corrosion inhibitor is deposited and adhered to the entire surface of the electrode rods 112a to 112e. Therefore, the solution detection level abnormality is not unnecessarily determined.

For this reason, the absorption refrigerator smoothly transitions from the initial operation state (state where the solution temperature is low) to the steady state operation (state where the solution temperature is high), and the operation control of the absorption refrigerator becomes stable.

On the other hand, when the absorption refrigerator shifts to a steady operation state, the temperature of the lithium bromide solution Y becomes high (80 ° C. or more), and the solution is kept in a state where the corrosion inhibitor does not precipitate and adhere. When an abnormality is determined by the level detection abnormality determination unit 81, the detection electrode rod for detecting a relatively high solution level is in a conductive state without causing the adhesion of the corrosion inhibitor, but is relatively higher than that. It is possible to reliably detect that a solution level detection abnormality has occurred, that is, that the detection electrode rod for detecting an extremely low solution level is in a non-conductive state. That is, the solution level detection abnormality can be determined when necessary.

For this reason, it is possible to judge the solution level detection abnormality (phase relation abnormality) only when necessary, to detect the solution level reliably, and to perform the stable operation of the absorption refrigerator.

In the example shown in FIG.
Although the combustion information of the high-pressure regenerator 40 is used as one of the AND conditions, this information may not necessarily be used in principle. However, in actual equipment, combustion information is also used as one of the conditions in order to make a more accurate determination.

<Second Embodiment> In the example shown in FIG. 4, temperature information of a lithium bromide solution is used as one of the AND conditions of the AND gate 7, but instead, absorption refrigeration is used. Whether or not a certain time has elapsed since the start of the operation of the machine may be used as one of the AND conditions. In this case, the “constant time” is set to a time from the start of operation until the lithium bromide solution reaches a predetermined temperature (for example, 80 ° C.) or more according to the characteristics and capacity of each absorption refrigerator.

<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, instead of the abnormality determination logic R shown in FIG. 4, an abnormality determination inference unit R-1 is incorporated in the control unit 80 as shown in FIG. The operating state signal D is input to the abnormality determination inference unit R-1. This operating state signal D indicates the operating state of each device involved in increasing or decreasing the solution level of the lithium bromide solution in the high-pressure regenerator 40 (for example, the operating state of the solution pump P3 that supplies the lithium bromide solution to the high-pressure regenerator 40). ) And the pressure data in the high-pressure regenerator 40.

The abnormality determination inference unit R-1 outputs the operation state signal D
Based on the above, it is inferred whether the solution level of the lithium bromide solution in the high-pressure regenerator 40 increases or decreases. Then, the conduction / non-conduction state of the detection electrode rods 112b to 112e is detected over time, and the detection electrode rods 112b to 112e are detected.
It is determined whether the increase or decrease of the solution level obtained based on the conductive / non-conductive state of 112e matches the inferred increase or decrease result.

When the actual increase / decrease of the solution level and the inferred increase / decrease do not match, the abnormality determination inference unit R-1 outputs a high level signal, and otherwise outputs a low level signal.

The structure of the other parts is the same as that shown in FIG. Therefore, the high-pressure regenerator 40 is in a combustion state, the temperature of the lithium bromide solution Y in the high-pressure regenerator 40 is 80 ° C. or higher, and the abnormality determination inference unit R
Only when the abnormality is determined based on −1, the solution level detection abnormality determining unit 81 determines that the detection is abnormal in the solution level.

<Fourth Embodiment> Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, a heater H is disposed at the bottom inside the detector box 111 of the solution level detector 110, and the heater H always supplies the lithium bromide solution Y in the detector box 111. ,
Heated above 80 ° C.

For this reason, in the detector box 111, no precipitation of the corrosion inhibitor occurs, and no abnormalities in the phase relation due to deposition and adhesion to the corrosion inhibitor occur. For this reason, by detecting the phase relationship abnormality by the abnormality determination logic R, the control unit 80 can accurately detect the phase relationship abnormality that is not caused by the deposition and adhesion of the corrosion inhibitor.

[0076]

As described above in detail with the embodiments, in the present invention, it is installed in communication with the high-pressure regenerator of the absorption refrigerator and detects that the solution in the high-pressure regenerator has entered. And a plurality of electrode rods of different lengths that are arranged in a state where the upper part of the electrode is fixed to the upper plate of the detector box and extends downward inside the detector box. A voltage is applied between the common electrode rod, which is the longest electrode rod among the electrode rods, and the detection electrode rod, which is the remaining electrode rod, and each detection is performed according to the level of the solution in the detector box. A solution level detector for detecting a solution level when the electrode rods gradually become conductive, a temperature detection member for detecting the temperature of the solution in the detector box, and each detection electrode rod of the solution level detector Solution level based on the continuity of Detects a state in which the detection electrode rod for detecting a relatively lower solution level is in a non-conductive state while the detection electrode rod for detecting a relatively high solution level is in a conductive state, and When it is detected that the temperature of the solution detected by the temperature detecting member is equal to or higher than a preset temperature, it is determined that the detection of the solution level obtained based on the conduction state of each detection electrode bar is abnormal. It consists of a control unit.

With this configuration, according to the present invention, when the temperature of the solution (lithium bromide solution) is low, the detection of the solution level is abnormal even if the corrosion inhibitor is deposited and adhered to the entire surface of the electrode rod. Is not determined. Therefore,
The solution detection level abnormality is not unnecessarily determined. As a result, the absorption refrigerator smoothly transitions from an initial operation state (solution temperature is low) to a steady operation state (solution temperature is high), and the operation control of the absorption refrigerator becomes stable.

Further, according to the present invention, a detector box which is installed in communication with the high-pressure regenerator of the absorption refrigerator and in which the solution in the high-pressure regenerator has penetrated, and the upper part of the electrode is located on the upper plate of the detector box. A common electrode, which is a plurality of electrode rods that are fixed and are arranged in a state of extending downward inside the detector box and that have different lengths in stages, and the longest electrode rod among the electrode rods A voltage is applied between the rod and a detection electrode rod, which is the remaining electrode rod, and each detection electrode rod is gradually turned on according to the level of the solution in the detector box, so that the solution level is increased. The solution level detector for detecting the solution level, while detecting the solution level based on the conduction state of each detection electrode rod of the solution level detector, while the detection electrode rod for detecting a relatively high solution level is in a conduction state But the solution level is relatively lower When a state in which the detection electrode rod is in a non-conducting state is detected, and when it is detected that a predetermined period of time has elapsed since the start of the operation of the absorption refrigerator, each detection is performed. The control unit determines that the detection of the solution level obtained based on the conduction state of the electrode rod is abnormal.

With this configuration, the temperature detector is not required, and the control configuration is simple, but the determination of the solution detection level abnormality is not unnecessarily performed. As a result, the absorption refrigerator smoothly transitions from an initial operation state (solution temperature is low) to a steady operation state (solution temperature is high),
The operation control of the absorption refrigerator becomes stable.

Further, according to the present invention, a detector box which is installed in communication with the high-pressure regenerator of the absorption refrigerator and in which the solution in the high-pressure regenerator has penetrated, and the upper part of the electrode is located on the upper plate of the detector box. A common electrode, which is a plurality of electrode rods that are fixed and are arranged in a state of extending downward inside the detector box and that have different lengths in stages, and the longest electrode rod among the electrode rods A voltage is applied between the rod and a detection electrode rod, which is the remaining electrode rod, and each detection electrode rod is gradually turned on according to the level of the solution in the detector box, so that the solution level is increased. A solution level detector, a temperature detection member for detecting the temperature of the solution in the detector box, and a solution level detector for detecting the solution level based on the conduction state of each detection electrode rod of the solution level detector. The melting in the high-pressure regenerator The resulting solution level is obtained by inferring whether or decreasing and increasing the conductive or of each detection electrode rod
When the increase or decrease in the solution level obtained by detecting the non-conduction state with the passage of time does not match, and when it is detected that the temperature of the solution detected by the temperature detection member is equal to or higher than a preset temperature, And a control unit that determines that the detection of the solution level obtained based on the conduction state of each detection electrode bar is abnormal.

With this configuration, the solution detection level abnormality is not unnecessarily determined. As a result, the absorption refrigerator smoothly transitions from an initial operation state (solution temperature is low) to a steady operation state (solution temperature is high), and the operation control of the absorption refrigerator becomes stable.

Further, according to the present invention, a detector box which is installed in communication with the high-pressure regenerator of the absorption refrigerator and in which the solution in the high-pressure regenerator has penetrated, and the upper part of the electrode is located on the upper plate of the detector box. A common electrode, which is a plurality of electrode rods that are fixed and are arranged in a state of extending downward inside the detector box and that have different lengths in stages, and the longest electrode rod among the electrode rods When a voltage is applied between the rod and the detection electrode rod which is the remaining electrode rod, each detection electrode rod is gradually turned on according to the level of the solution in the detector box. A solution level detector for detecting a level, a heating member disposed in the detector box for heating the solution, and a solution level detector for detecting a solution level based on a conduction state of each detection electrode rod of the solution level detector. Detection to detect relatively high solution levels If the detection electrode rod that detects a relatively lower solution level than the electrode rod is in a conductive state while the electrode rod is in a non-conductive state is detected, the conductive state of each detection electrode rod is changed. And a controller that determines that the detection of the solution level obtained based on the abnormality is abnormal.

With this configuration, it is possible to always accurately detect the solution level in both the initial operation state (solution temperature is low) and the steady operation state (solution temperature is high). Then, the solution detection level abnormality is not unnecessarily determined.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing the overall configuration of an absorption refrigerator.

FIG. 2 is a configuration diagram showing a solution level detection mechanism according to the embodiment of the present invention.

FIG. 3 is a configuration diagram showing a solution level detector of the solution level detection mechanism according to the embodiment of the present invention.

FIG. 4 is a block diagram showing a control unit of the solution level detecting mechanism according to the embodiment of the present invention.

FIG. 5 is a block diagram showing a control unit of a solution level detection mechanism according to another embodiment of the present invention.

FIG. 6 is a configuration diagram showing a solution level detection mechanism according to still another embodiment of the present invention.

FIG. 7 is a configuration diagram showing a conventional solution level detection mechanism.

FIG. 8 is a configuration diagram showing a solution level detector of a conventional solution level detection mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Evaporator 11 Evaporator tube 20 Absorber 21 Absorber tube 30 Low temperature heat exchanger 31 High temperature heat exchanger 40 High pressure regenerator 50 Low pressure regenerator 51 Low pressure regenerator tube 60 Condenser 61 Condenser tube 80 Control part 100, 110 Solution level detector 101,111 Detector box 102a-102e, 112a-112e Electrode rod 101a, 111a Upper plate 150 Temperature sensor 200 Control unit R Abnormality determination logic R-1 Abnormality determination inference unit H Heater P1 Refrigerant pump P2, P3 Solution Pump L1 Cold water inlet line L2 Cold water outlet line L3, L4 Cooling water line L11-L14 Refrigerant line L21-L25 Solution line L31 Gas (fuel) line R Refrigerant (water) r Refrigerant vapor Y1 Lithium bromide concentrated solution Y2 In lithium bromide Solution Y3 Dilute lithium bromide solution 1 cold water W2 coolant G fuel gas TL coolant outlet temperature V22 fuel control valve

Claims (4)

[Claims] 1. A detector box which is installed in communication with a high-pressure regenerator of an absorption refrigerator and in which a solution in the high-pressure regenerator has entered, and an upper electrode is fixed to an upper plate of the detector box. Along with a plurality of electrode rods having different lengths in a stepwise manner arranged in a state of extending downward inside the detector box, the common electrode rod which is the longest electrode rod among the electrode rods and the remaining A voltage is applied between the detection electrode rods, which are the electrode rods, and the detection of the solution level is performed by making each detection electrode rod conductive in a stepwise manner according to the level of the solution in the detector box. A solution level detector, a temperature detecting member for detecting a temperature of the solution in the detector box, and a solution level detector for detecting the solution level based on the conduction state of each detection electrode rod of the solution level detector, while the solution level is relatively high. The detection electrode rod that detects the solution level becomes conductive However, it detects a state in which the detection electrode rod for detecting a relatively lower solution level is in a non-conductive state, and the temperature of the solution detected by the temperature detecting member is equal to or higher than a preset set temperature. A high-pressure regenerator characterized by comprising: a control unit for determining that the detection of the solution level obtained based on the conduction state of each detection electrode bar is abnormal when detecting that Solution level detection mechanism. 2. A detector box which is installed in communication with a high-pressure regenerator of an absorption refrigerator and in which a solution in the high-pressure regenerator has entered, and an upper electrode is fixed to an upper plate of the detector box. Along with a plurality of electrode rods having different lengths in a stepwise manner arranged in a state of extending downward inside the detector box, the common electrode rod which is the longest electrode rod among the electrode rods and the remaining A voltage is applied between the detection electrode rods, which are the electrode rods, and the detection of the solution level is performed by making each detection electrode rod conductive in a stepwise manner according to the level of the solution in the detector box. While the solution level detector detects the solution level based on the conduction state of each detection electrode rod of the solution level detector, the detection electrode rod that detects a relatively high solution level is in the conduction state. Tests that detect relatively lower solution levels When the state in which the electrode rods are in a non-conductive state is detected, and when it is detected that a predetermined period of time has elapsed from the time when the absorption refrigerator starts operation, the conduction of each detection electrode rod is detected. And a control unit for determining that the detection of the solution level obtained based on the state is abnormal. 3. A detector box which is installed in communication with a high-pressure regenerator of an absorption refrigerator and in which a solution in the high-pressure regenerator has entered, and an upper electrode is fixed to an upper plate of the detector box. Along with a plurality of electrode rods having different lengths in a stepwise manner arranged in a state of extending downward inside the detector box, the common electrode rod which is the longest electrode rod among the electrode rods and the remaining A voltage is applied between the detection electrode rods, which are the electrode rods, and the detection of the solution level is performed by making each detection electrode rod conductive in a stepwise manner according to the level of the solution in the detector box. A solution level detector, a temperature detection member for detecting the temperature of the solution in the detector box, and a solution level detector for detecting the solution level based on the conduction state of each detection electrode rod of the solution level detector. The solution level of the solution in the high-pressure regenerator based on the operating state The result obtained by inferring whether it is increasing or decreasing is inconsistent with the increase or decrease in the solution level obtained by detecting the conduction / non-conduction state of each detection electrode rod over time, and the temperature detection A control unit that, when detecting that the temperature of the solution detected by the member is equal to or higher than a preset temperature, determines that the detection of the solution level obtained based on the conduction state of each detection electrode rod is abnormal. A solution level detecting mechanism for a high-pressure regenerator, comprising: 4. A detector box which is installed in communication with a high-pressure regenerator of an absorption refrigerator and in which a solution in the high-pressure regenerator has entered, and an upper electrode is fixed to an upper plate of the detector box. Along with a plurality of electrode rods having different lengths in a stepwise manner arranged in a state of extending downward inside the detector box, the common electrode rod which is the longest electrode rod among the electrode rods and the remaining The voltage is applied between the detection electrode rods, which are the electrode rods, so that each detection electrode rod is gradually turned on according to the level of the solution in the detector box to detect the solution level. A solution level detector, a heating member arranged in the detector box for heating the solution, and a solution level detector for detecting the solution level based on the conduction state of each detection electrode rod of the solution level detector. Detection electrode rod that detects extremely high solution levels is conductive If the detection electrode rod that detects a relatively lower solution level is detected in a non-conductive state, the solution obtained based on the conductive state of each detection electrode rod A control unit for determining that the level detection is abnormal; and a solution level detecting mechanism of the high-pressure regenerator.