JP2722086B2 - Multi-stage solution concentration controller for liquid absorption type dehumidifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid absorption type dehumidifier used for keeping indoor air at low temperature and low humidity for preservation of reproductive traits and other storage. The present invention relates to a multi-stage solution concentration control device.

[Conventional technology]

The liquid absorption type dehumidifying device is a device for absorbing moisture in the air by bringing a hygroscopic aqueous solution into contact with moist air to dehumidify, and lithium chloride, triethylene glycol or the like is used as a moisture absorbing agent.

The equilibrium vapor pressure of a lithium chloride aqueous solution is determined by its concentration and temperature. At the same concentration, the temperature and the equilibrium vapor pressure are proportional,
At the same temperature, the concentration and the equilibrium vapor pressure are inversely proportional. These relationships are shown in a lithium chloride aqueous solution equilibrium diagram (see FIG. 3). An arbitrary dew point humidity corresponding to the equilibrium vapor pressure can be obtained by determining the concentration and temperature of the solution. In Fig. 3, 40%
The equilibrium vapor pressure at a liquid temperature of 25 ° C of the concentration indicates 4.0 mmHg,
The equivalent dew point temperature is -2 ° C. The complete contact of the humid air with this liquid means that any dew point temperature is obtained.

A general liquid absorption type dehumidifier is composed of a regulating tower, a liquid tank and a regeneration tower, a spray nozzle for bringing air and liquid into sufficient contact, a cooler for cooling air and liquid, a blower and An adjustment tower that adjusts the temperature and humidity of circulating air with an air heater, a liquid tank with a liquid level control device that keeps the liquid level of the liquid tank constant by a liquid pump, and sufficient contact between the outside air and the liquid. And a regeneration tower having a liquid heater for heating the liquid, a blower, and the like.The solution in which the desiccant is dissolved is heated, and is dispersed in the regeneration air to be discharged from the circulation air of the adjustment tower. It absorbs moisture, releases a considerable amount of water whose liquid level has increased, and keeps the liquid level in the tank constant so that the concentration of the liquid level is kept constant.

Conventionally, this type of liquid absorption type dehumidifier has been used to maintain the indoor air at low temperature and low humidity for preservation of reproductive traits and other storage. Was determined based on and was driven throughout the year.

[Problems to be solved by the invention]

However, since the operation is performed throughout the year at the solution concentration based on the maximum load in summer, even in the interim period and winter when the cooling and dehumidification load decreases, the solution based on the maximum load in summer is used due to the equilibrium vapor pressure of the solution. It is necessary to keep the temperature. For this reason, the circulating air in the regulating tower is unnecessarily cooled, heated again, and then sent into the room, resulting in a large energy loss.

The present invention has been devised in view of the above-described problems, and includes a simple and inexpensive method for preventing energy loss due to unnecessary cooling and heating during a period of reduction of a cooling / dehumidifying load, such as an intermediate period or winter. It is an object of the present invention to provide a multi-stage solution concentration control device for a liquid absorption type dehumidifier realized by a method.

[Means for solving the problem]

In order to achieve the above object, the multi-stage solution concentration control device for a liquid absorption dehumidifier according to the present invention includes an element that is proportional to a cooling / dehumidifying load, such as an outside air temperature or a solution temperature or an air temperature at a regulating tower cooler outlet. By controlling the liquid level in multiple stages in combination with an electrode type liquid level controller, the gist is to automatically select and control the solution concentration corresponding to the cooling / dehumidifying load in the load reduction period. That is, a regulating tower through which circulating air circulates in the air regulating chamber, a regeneration tower through which outside air passes, a liquid tank for collecting the liquid in the regulating tower and the regeneration tower, and air in the regulating tower and the regeneration tower. A liquid absorbent dehumidifier comprising: a liquid desiccant spraying means for supplying and spraying a desiccant solution such as lithium chloride or triethylene glycol from the liquid tank to the desiccant sprayed from the desiccant solution spraying means on the regeneration tower side. Dissolution It constitutes a liquid heating means for heating the,
The concentration of the solution is multi-stepped by both the element proportional to the cooling / dehumidifying load such as the outside air temperature or the temperature of the desiccant solution or the outlet temperature of the cooler, and the liquid level output from the electrode type liquid level detector provided in the liquid tank. The above-described liquid heating means is controlled by a multi-stage solution concentration control device that controls the temperature.

[Action]

According to the above configuration, a logic circuit that detects an element proportional to a cooling / dehumidifying load such as an outside air temperature and determines a three-stage of a high-temperature region, a medium-temperature region, or a low-temperature region is constructed.
The electrode type liquid level detector constructs a logic circuit that detects three levels of high liquid level, middle liquid area and low liquid area, and combines the two logic circuits to form a logic circuit that performs three levels of liquid level control If the cooling and dehumidification load is large in the high temperature area and the outside air is high, the liquid level is high when the outside air is in the middle temperature area and the cooling and dehumidification load is medium, and the cooling and dehumidification load is low in the low temperature area. By controlling the liquid heater of the regeneration tower so that the liquid level becomes low when the amount is small, a three-stage solution concentration suitable for the cooling / dehumidifying load can be obtained.

As a result, the temperature of the outside air, etc., is taken as a measure of the cooling / dehumidifying load, and the concentration approximating the appropriate equilibrium vapor pressure is automatically selected in the load area divided into three stages. By suppressing the amount and the amount of reheating, energy saving can be realized.

It is needless to say that the adjustment stage is not limited to three stages but can be made multistage to enhance the energy saving effect.

〔Example〕

An embodiment of a multi-stage solution concentration control device for a liquid absorption type dehumidifier according to the present invention will be described below with reference to FIGS.

FIG. 1 shows a schematic diagram of a liquid absorption type dehumidifier provided with a multi-stage solution concentration control device.
2, comprising a liquid tank 3 and a multi-stage solution concentration control device 4.
The control tower 1 is provided with a ventilation duct from an air control room (closed or semi-closed space for maintaining room temperature and humidity at a set value).
An air cleaning chamber 11 communicating with 51 and an air supply chamber 12 communicating with an air supply duct 52 to the air adjustment chamber 5 are formed at the lower end thereof in a U-shape. This is in communication with the liquid tank 3 via Further, the air cleaning chamber 11 is provided with a heat exchange part 61 of the cooler 6, and the spray nozzle 13 is provided above the heat exchange part 61, and the spray nozzle 13 is provided at the tip of the lithium chloride liquid supply pipe 34. It communicates with the liquid in the liquid tank 3 via the liquid pump 33.

Further, 14 is an air supply duct 52 communicating with the upper end of the air supply chamber 12.
The air heater provided at the air supply port of (1) constitutes an adjustment-side structure A for supplying the air adjusted by the blower 15 to the air adjustment chamber 5.

On the other hand, the regeneration side structure B composed of the regeneration tower 2 communicates the substantially L-shaped bottom liquid reservoir 21 with the liquid tank 3 via the regeneration side return liquid pipe 35 and the lower intake port 22. To blower
An air opening port 24 provided at the upper part from the intake port 22 by providing
An airflow flowing in the direction (arrow C) is formed, and a spray nozzle 25 is provided in the upward airflow. The spray nozzle 25 is
A liquid heater 7 is interposed in the middle of the lithium chloride liquid supply pipe 34 on the branch side, and communicates with a tip of a pipe branched from the lithium chloride liquid supply pipe 34. The heating temperature is controlled by a driving signal from a multi-stage solution concentration control device 4 which is operated based on input information of a liquid level sensor 8 and an outside air temperature sensor 9 provided in a liquid tank 3, and a supplied lithium chloride solution is heated to a predetermined value. I do.

As shown in FIG. 2, the multi-stage solution concentration controller 4
Are connected to the liquid level sensor 8 hanging down from the multi-pole electrode holder 81 to the liquid tank 3 with a plurality of electrode rods 82, 82. , A liquid level detection logic circuit 41 for detecting “low liquid level” and a temperature range detection logic circuit for detecting “high temperature range”, “medium temperature range” and “low temperature range” by connecting to the outside air temperature sensor 9 42 and liquid level detection logic circuit 41
And a multi-stage solution concentration control logic circuit 43 for controlling the temperature of the liquid heater 7 in accordance with a logic signal from the temperature range detection logic circuit 42 as follows. The multi-stage solution concentration control logic circuit 43 controls (1) a high liquid level when the outside air is in a high temperature range and a large cooling / dehumidification load, and (2) a case where the outside air is a medium temperature range and the cooling / dehumidification load is medium. Is the middle liquid level, and (3) is the low liquid level when the outside air is in a low temperature range and the cooling / dehumidifying load is small.

The multi-stage solution concentration control device of the liquid absorption type dehumidifier having the above-described configuration is configured such that the mist of the absorbent a such as lithium chloride or triethylene glycol ejected from the spray nozzle 13 in the adjusting tower 1 is sufficiently brought into contact with air. At the same time, the absorbent a solution is cooled by the heat exchange section 61 of the cooler 6 and the circulating air is also cooled and dehumidified, and then the air heated by the air heater 14 is sent to the air control chamber 5 by the floor 15. To adjust the temperature and humidity of the circulating air. On the other hand, in the regeneration tower 2, the moisture absorbent a heated and adjusted by the liquid heater 7 ejected from the spray nozzle 25 is sprayed, and the outside air E supplied by the blower 23 and the moisture absorbent a are sufficiently brought into contact. As a result, moisture is absorbed from the circulating air of the regulating tower 1 and water corresponding to the increased liquid level in the liquid tank 3 is released, and the concentration of the solution is maintained by keeping the liquid level in the liquid level tank constant. The temperature and humidity of the circulating air in the air conditioning chamber 5 can be controlled and maintained at a constant value.

〔The invention's effect〕

The multi-stage solution concentration control device for the liquid absorption dehumidifier according to the present invention is configured as described above,
Considering the dehumidification load amount as a guide, the concentration approximating the appropriate equilibrium vapor pressure is automatically selected in the load area divided into multiple stages, suppressing the supercooling amount and reheating amount of the circulating air in the regulating tower, Since a multi-stage solution concentration corresponding to the cooling / dehumidification load can be obtained, energy saving can be realized, and the effect after the present invention is implemented is extremely large.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the entirety of a liquid absorption type dehumidifier according to the present invention. FIG. 2 is a block diagram showing one embodiment of a multi-stage solution concentration control device for the liquid absorption type dehumidifier according to the present invention. FIG. 3 is an equilibrium diagram of a lithium chloride aqueous solution. DESCRIPTION OF SYMBOLS 1 ... Adjustment tower 2 ... Regeneration tower 3 ... Liquid tank 4 ... Multi-stage solution concentration control device 5 ... Air adjustment chamber, 6 ... Cooler 7 ... Liquid heater, 8 ... Liquid level sensor 9: outside air temperature sensor 41: liquid level detection logic circuit 42: temperature range detection logic circuit 43: multi-stage solution concentration control logic circuit

Claims (1)

(57) [Claims] 1. A regulating tower through which circulating air circulates in an air regulating chamber, a regeneration tower through which outside air passes, a liquid tank for collecting the liquid in the regulating tower and the regeneration tower, the regulating tower and a regeneration tower A liquid absorbent dehumidifier comprising a liquid absorbent dehumidifier for supplying and spraying a desiccant solution such as lithium chloride or triethylene glycol from the liquid tank to the air of the liquid. A liquid heating means for heating the desiccant solution, an element proportional to a cooling / dehumidification load such as an outside air temperature or the desiccant solution temperature or a cooler outlet temperature, and an electrode type liquid level detector provided in the liquid tank A multi-stage solution concentration controller for a liquid absorption type dehumidifier, wherein the liquid heating means is controlled by a multi-stage solution concentration controller for controlling the solution concentration in multiple stages based on both of the liquid level outputs from the liquid.