JPH0960999A - Double effect absorption water cooler water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double effect absorption water cooler water heater to prevent no-water burning of a high temperature regenerator and corrosion of a material metal even when the pressure fluctuation of the absorption solution system of the absorption water cooler water warmer is high. SOLUTION: A double effect absorption water cooler water heater comprises a float valve 6 having a float, floating on the liquid level of a gas liquid separator 2 communicating with a high temperature regenerator 1, and a valve part to regulate a flow rate of a dilute solution, flowing in the high temperature regenerator 1, in response to a float position, a liquid level sensor 8 to detect the liquid level of a gas liquid separator 2 communicating with the high temperature regenerator 1, and a fuel feed amount control means to regulate an amount of fuel fed to a burner 7 for heating of the high temperature regenerator 1 in response to an output from the liquid level sensor 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-effect absorption chiller / heater equipped with a high temperature regenerator and a low temperature regenerator.

[0002]

2. Description of the Related Art Absorption chiller-heaters using an aqueous lithium bromide solution as a working medium are known. Due to the physical properties of lithium bromide, which is the working medium, and legal regulations, the internal pressure of the machine is always below atmospheric pressure. On the other hand, in an absorption chiller-heater, the working medium normally circulates due to the pressure difference between the components inside the machine, but the operating pressure is below atmospheric pressure, so the operating pressure may fluctuate significantly even when the load changes. Absent. Therefore, for example, by providing a fixed orifice or the like, relatively stable operation is maintained under various operating conditions without special control.

[0003]

[Problems to be solved by the invention] However,
In order to improve the performance of the heat source machine, it is expected to use a working medium having a wider working range than before. In that case, from the physical properties of the medium, the operating conditions that can contribute to the high performance of the heat source machine are:
Range where the internal pressure exceeds atmospheric pressure, that is, the maximum gauge pressure is 1
It will be operated at kg / cm ² .

In the operation in such a high pressure region, the ratio of the pressure change with respect to the temperature change tends to be drastically increased in view of the physical properties of the working medium, as compared with the conventional operation under atmospheric pressure. Therefore, under conditions where the temperature of the working medium changes abruptly, such as when the load fluctuates or when the engine is started, the pressure inside the machine fluctuates greatly and the pressure difference between the elements also fluctuates rapidly.

Here, the pressure fluctuation range is larger at the high temperature regenerator pressure directly affected by the operating conditions than at the low temperature regenerator pressure which strongly depends on the cooling water temperature. That is, the liquid level fluctuation in the gas-liquid separator communicating with the high temperature regenerator becomes extremely large.

On the other hand, in an ordinary absorption chiller-heater, the absorption solution, which is a working medium, flows into the high-temperature regenerator by a pump, and outflows by the pressure difference between the elements. A method is used in which a ball tap is provided in the solution reservoir of a gas-liquid separator communicating with the vessel and the flow rate of the solution flowing into the high temperature regenerator is controlled according to the fluctuation of the liquid level. However, this method is effective when the pressure fluctuation is small and the fluctuation of the liquid level is small as in the prior art, but it cannot be dealt with when the pressure fluctuation is large and the liquid level fluctuation is large. Considering the case where the liquid level becomes abnormally low under transient conditions where the operating conditions are fluctuating, and there is a risk of metal corrosion or damage due to the high temperature regenerator being heated or the absorption solution being rapidly heated. .

The present invention has been proposed in view of the above-mentioned problems of the prior art, and even when the pressure fluctuation in the system of the absorption chiller-heater is large, the high-temperature regenerator is not heated or the metal is corroded or damaged. It is an object of the present invention to provide a double-effect absorption chiller / heater capable of preventing the above.

[0008]

The double-effect absorption chiller-heater of the present invention is a double-effect absorption chiller-heater having a high-temperature regenerator and a low-temperature regenerator, and a gas-liquid separator communicating with the high-temperature regenerator. Of the float floating on the liquid surface of and the valve portion for adjusting the flow rate of the dilute solution flowing into the high temperature regenerator in response to the float position, and the liquid level of the gas-liquid separator communicating with the high temperature regenerator. A liquid level sensor for detecting and a fuel supply amount control means for adjusting the fuel supply amount to the heating burner of the high temperature regenerator in response to the output of the liquid level sensor are included.

In carrying out the present invention, a sensor for measuring the temperature or pressure in the high temperature regenerator, a flow rate adjusting means interposed in the path of the absorbing solution, and a flow rate adjustment in response to the measurement result of the sensor. It is preferable to include an absorbing solution flow rate control means for controlling the means to adjust the flow rate of the absorbing solution.

Further, a flow rate adjusting means is provided in a condensed refrigerant path communicating from the low temperature regenerator to the condenser, and the low temperature regenerator is condensed with the low temperature regenerator in accordance with the temperature or pressure of the high temperature regenerator measured by the sensor. It is preferable to control the flow rate adjusting means interposed between the device and the container.

According to the double-effect absorption chiller-heater according to the present invention, the amount of the dilute solution flowing into the high temperature regenerator is adjusted by the float valve of the high temperature regenerator, but the liquid level is greatly changed due to load fluctuation and the like. If it fluctuates, the level sensor, which is a liquid level sensor, detects the liquid level of the gas-liquid separator communicating with the high temperature regenerator, and based on the signal, the fuel supply amount control means supplies it to the burner that heats the high temperature regenerator. By controlling the amount of fuel to be used, it is possible to prevent the high temperature regenerator from being overheated or heated.

Therefore, the so-called "next-generation working medium" can be used to control even if the pressure fluctuation inside the machine becomes higher than before, which greatly contributes to the practical application of a working medium having a wide working range. Of.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a high-temperature regenerator generally designated by reference numeral 1 of a double-effect absorption chiller-heater according to the present invention, in which a main body 1a is connected to a gas-liquid separator 2 provided at an upper portion thereof by a connecting portion 2a. The gas phase part 2b of the gas-liquid separator 2 is connected to a low temperature regenerator (not shown) in the refrigerant path 3, and the liquid phase part 2c is connected to a high temperature heat exchanger (not shown).

The main body 1a is connected to a high temperature heat exchanger (not shown) via an absorption solution path 5, and the absorption solution path 5 is provided with a float valve 6 having a float floating on the liquid surface of the gas-liquid separator 2. The gas-liquid separator 2 is provided with a level sensor 8 for detecting the liquid level, and is connected to the burner 7 through an electric path 10 via an actuator 9.

The operation will be described below with reference to FIG.

In operation, first, the level sensor 8 detects the liquid level of the gas-liquid separator 2 (step S1). An appropriate gas combustion amount in the high temperature regenerator is determined for the detected liquid level (step S2). Then, it is determined whether or not the desired gas combustion amount is satisfied (step S3). If YES in step S3, the process returns to the start. If NO in step S3, the actuator 9 is operated (step S4),
The process returns to step S3 to end the control.

Therefore, the high temperature regenerator 1 is not boiled or the material metal is not corroded.

FIG. 3 is a block diagram of an embodiment in which the high temperature regenerator according to the present invention is used in a series flow absorption chiller-heater, and the high temperature regenerator 1 is a low temperature regenerator 12 via a first needle valve V1. The low temperature regenerator 12 is connected to the condenser 13 via the refrigerant vapor path and the condensed refrigerant path (the path in which the valve V4 is interposed). Here, the refrigerant vapor path is a path through which the refrigerant vapor generated in the low temperature regenerator 12 flows, while the condensed refrigerant path is the low temperature regenerator 1.
This is a path through which a liquid-phase refrigerant condensed by applying heat to the absorbing solution in 2 flows through, and a fourth needle valve V4 is interposed.

Further, the condenser 13 is connected to the absorber 15 via the evaporator 14 in the refrigerant path, and the absorber 15 is absorbed into the high temperature regenerator 1 via the pump 19 and the second needle valve V2. Connected by a route.

The high temperature regenerator 1 and the low temperature regenerator 12 are connected by a refrigerant vapor path, and the low temperature regenerator 12 and the absorber 1 are connected.
5 is connected via a second orifice 22 via an absorption solution path, and the evaporator 14 is provided with a path having a pump 20 that circulates the remaining refrigerant that has not evaporated.

A pressure sensor 18 is connected to the high temperature regenerator 1, and the sensor 18 is the first actuator 16
And a second actuator 17, and the first actuator 16 has a fourth needle valve V4,
The second actuator 17 is connected to the first and second needle valves V1 and V2, respectively.

Therefore, the absorption chiller / heater is the high temperature regenerator 1.
The pressure of the actuator 1 by the pressure sensor 18
The first and second needle valves 6 and 17 are controlled by 6, 17 to maintain a desired flow rate, and the fourth needle valve V4 is operated as necessary to prevent refrigerant vapor escape. Then, the burner 7 of the high temperature regenerator 1 is controlled as in the first embodiment, so that the burning and the corrosion and damage of the material metal are prevented, so that stable operation can be secured for a long period of time.

4 and 5 show an example applied to a double-effect cold / hot water machine of a type different from that shown in FIG.
The structure and operation are almost the same as in the case of FIG.

[0025]

The present invention is configured as described above,
The following excellent effects can be achieved. (1) Since the level sensor provided in the gas-liquid separator detects the liquid level and controls the combustion of the burner, it is possible to prevent the high temperature regenerator from being heated or corroded. (2) Therefore, stable operation of the absorption chiller-heater can be secured, and a working medium having an operating range exceeding atmospheric pressure can be used.

[Brief description of drawings]

FIG. 1 is a schematic view showing a cross section of a high temperature regenerator showing an embodiment of the present invention.

2 is a flowchart of control of the burner shown in FIG.

FIG. 3 is a block diagram showing an embodiment of an absorption chiller-heater of a series flow according to the present invention.

FIG. 4 is a block diagram showing an embodiment of a parallel flow absorption chiller-heater according to the present invention.

FIG. 5 is a block diagram showing an embodiment of a reverse flow absorption chiller-heater according to the present invention.

[Explanation of symbols]

 1 ... High temperature regenerator 2 ... Gas-liquid separator 3 ... Refrigerant path 5 ... Absorption solution path 6 ... Float valve 7 ... Burner 8 ... Level sensor 9 ... Actuator 12 ... Low temperature regenerator 13 ... Condenser 14 ... Evaporator 15 ... Absorber 18 ... Pressure sensor V1, V2, V4 ... Needle valve

Claims (3)

[Claims] 1. In a double-effect absorption chiller-heater equipped with a high-temperature regenerator and a low-temperature regenerator, a float floating on the liquid surface of a gas-liquid separator communicating with the high-temperature regenerator and a high temperature in response to the float position. A float valve having a valve portion for adjusting the flow rate of the dilute solution flowing into the regenerator, a liquid level sensor for detecting the liquid level of the gas-liquid separator communicating with the high temperature regenerator, and a liquid level sensor responsive to the output of the liquid level sensor. And a fuel supply amount control means for adjusting the fuel supply amount to the heating burner of the high temperature regenerator. 2. A sensor for measuring the temperature or pressure in the high temperature regenerator, a flow rate adjusting means interposed in the path of the absorbing solution, and a flow rate adjusting means controlled in response to the measurement result of the sensor. The double-effect absorption cold / hot water generator according to claim 1, further comprising: an absorption solution flow rate control means for adjusting a flow rate of the absorption solution. 3. A condensing refrigerant path communicating from the low temperature regenerator to the condenser is provided with a flow rate adjusting means, and condensed with the low temperature regenerator in accordance with the temperature or pressure of the high temperature regenerator measured by the sensor. The double-effect absorption chiller-heater according to claim 2, which controls the flow rate adjusting means interposed between the absorption chiller-heater and the heater.