JPH0246237A - Method for controlling temperature of culture solution or air in hothouse - Google Patents

Abstract

PURPOSE:To control temperature of a culture solution by obtaining a cooling water by an adsorbing type cooler utilizing sensible heat of a heated ammonia liquor 1 obtained in cooling by water sprinkling of Coke furnace gas and cooling a culture solution utilizing the cooling water or heating the culture solution utilizing sensible heat of the heated ammonia liquor 1. CONSTITUTION:Cooling water is obtained by an adsorbing or absorbing type cooler 6 utilizing sensible heat of a heated ammonia liquor 1 obtained in cooling by water sprinkled of a Coke furnace gas and the cooling water is fed to heat exchanger 9, where a culture solution 5 for hothouse is cooled or the culture solution 5 for hothouse is heated by the heat exchanger 9 utilizing sensible heat of the above-mentioned heated ammonia liquor 1. As a result, temperature of the culture solution in hothouse can be relatively inexpensively and properly controlled.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention effectively utilizes the sensible heat of hot ammonium water obtained when coke oven gas is cooled by spraying water to appropriately control the culture solution temperature and air temperature in a greenhouse. It concerns how to control the

[Prior Art] In greenhouse cultivation of various crops, it is necessary to control the air temperature in the greenhouse, but in addition, for example, in the case of hydroponic cultivation, control of the culture solution temperature is also an important element. For example, in the summer, the temperature inside the greenhouse and the water temperature (culture solution) rise more than necessary, so the greenhouse can be cooled by running water (sprinkling water) or by absorbing the heat of vaporization using water spray and blowing fans. Alternatively, underground water, which has small temperature changes throughout the seasons, is used as a solvent for the culture solution. On the other hand, in winter, for example, electricity (sodium lamps, heaters, etc.) and fuels (petroleum, kerosene, 1-heavy oil, etc.) are used as heat sources to heat the culture solution, and in some cases, underground water is used as a heat source for heating. Sometimes it is done.

[Problems to be Solved by the Invention] However, with the techniques that have been used so far, the equipment costs and operating costs are enormous, which is a factor that pushes up the price of grown crops. Although the method of using groundwater is relatively inexpensive, there is a problem in that it consumes a large amount of limited groundwater resources.

The present invention was made in order to solve these technical problems, and its purpose is to provide a method that can appropriately control the culture solution temperature and air temperature in a greenhouse at a relatively low cost. It's about doing.

[Means for Solving the Problems] Among the present inventions that have achieved the above objects, the first invention is:
Using the sensible heat of hot ammonium water obtained during spray cooling of coke oven gas, cold water is obtained by an adsorption or absorption refrigerator, and the cold water is led to a heat exchanger to cool the greenhouse culture solution, or The gist is that the heat exchanger uses the sensible heat of the hot ammonium water to heat the greenhouse culture solution, and by adopting such a configuration, the culture solution in the greenhouse can be heated. Temperature can be controlled appropriately. The gist of the second invention is to appropriately control the air temperature in the greenhouse, and similarly, adsorption or absorption refrigeration is performed using the sensible heat of hot ammonium water obtained when cooling coke oven gas with water. The greenhouse can be cooled by obtaining cold water by a machine, guiding the cold water to a heat exchanger, and introducing the resulting cold air into the greenhouse, or by using the sensible heat of the hot ammonium water to directly heat the heat exchanger. The system is designed to heat the greenhouse by introducing it into the greenhouse.

[Function] The present invention is constructed as described above, but the point is that hot ammonium water, which has rarely been used as a heat source in the past, can be effectively used as a heat source for cooling and heating greenhouses and for adjusting the temperature of culture medium. This was done with the idea that this would be the case. The present invention will be described in detail while referring to the circumstances that led to the adoption of the above configuration.

For example, as shown in Figure 2, the coke oven gas generated from the coke oven (25h) has a high temperature of approximately 800 to 250°C, and is first cooled by flushing with cooling water (ammonium water that is being recycled). to a temperature of about 80-90°C, and the subsequent heat exchanger, i.e. primary cooler 1.
6, a direct cooler 17, etc., and the temperature reaches about 40 to 60° C., and then sent to the next step. At this time, by flushing the cooling water (ammonium water being circulated), the hot ammonium water 18 obtained by recovering the sensible heat of the coke oven gas, and the subsequent heat exchangers 16 and 17,
The hot ammonium 19.20 produced by cooling and condensation joins the tar decanter 21, removes tar, etc. from the hot ammonium, and is recycled for use. The temperature of hot ammonium water at this time is generally 5
The temperature will be 0 to 80°C. However, since this hot ammonium solution has a relatively low temperature range, it has rarely been used as a heat source in the past.

Therefore, the inventors of the present invention have studied methods of using ammonium hydroxide, which has rarely been used as a heat source in the past, as a heat source for greenhouses, and as a result, they have adopted the above configuration.

Hereinafter, the present invention will be explained in more detail with reference to examples, but the following examples are not intended to limit the present invention.
Any design changes for the purposes described below are included within the technical scope of the present invention.

[Example] FIG. 1 is a schematic explanatory diagram showing an example of a configuration for carrying out the method of the present invention, and the configuration is for controlling the temperature of a culture solution in a greenhouse.

First, ammonium 1 obtained by cooling coke oven gas is sent to a heat exchanger 2, where the sensible heat of the ammonium 1 is utilized and supplied from a storage tank 3 by a pump P. Warm water can be obtained by heating the water that has been previously heated.

For example, in summer, valves V, , V are closed, valve V
,,V4. Leave Vs open. After the hot water is supplied to the adsorption refrigerator 6, it returns to the storage tank 3 and is used for circulation. When hot water is supplied to the adsorption refrigerator 6 in this way, the refrigerant is evaporated by the heat of the hot water, and the heat of vaporization is adsorbed to form a refrigeration cycle, and the water supplied from the storage tank 8 by the pump P2 to cool down. The obtained cold water is sent to the heat exchanger 9 in the greenhouse 4 via the valve v4 and the solenoid valve V6, and then returned to the storage tank 8 for circulation.

A culture solution 5 is supplied to the heat exchanger 9 from a culture solution tank 10 by a pump P, and this culture solution 5 is cooled by heat exchange with the cold water. The temperature of the culture solution 5 is detected by a temperature detector 11, and when the temperature falls below the set temperature, the solenoid valve 6 on the cold water supply side is closed to cut off the cold water supplied to the heat exchanger 9, thereby preventing further temperature drop. is prevented. Conversely, when the temperature of the culture solution 5 becomes higher than the set temperature,
The electromagnetic valve V6 is opened, cold water is supplied to the heat exchanger 9, and the culture solution 5 is cooled. These operations are automatically performed by a sequencer built into the operation panel 12. The culture solution 5 cooled and temperature-controlled in this way is supplied to the hydroponic culture container 13 in the greenhouse 5 and used for plant cultivation, and then returned to the culture solution tank 10 as appropriate (the third
(see also the figure), and maintain the temperature of the culture solution 5 within an optimal range.

On the other hand, for example, in winter, the valves V, , V are open and the valves V 3 + V 4 + ''S are closed, and the hot water obtained in the heat exchanger 2 is cooled by adsorption refrigeration. The culture solution 5 is not supplied to the heat exchanger 6 but is directly supplied to the heat exchanger 9.
heating is performed. Then, the temperature of the culture solution 5 is adjusted in the same manner as the above-described operation.

By employing the above configuration, the temperature of the culture solution 5 can be appropriately adjusted regardless of whether it is summer or winter, and stable growth of plants can be achieved throughout the year. In addition, the above configuration effectively utilizes the calorific value of hot ammonium water, which has not been used conventionally, so that the cost of controlling the temperature of the culture solution can be reduced.

In the configuration shown in FIG. 1, the heat exchanger 2 is provided in consideration of the adverse effect on the adsorption refrigerator 6 caused by substances contained in the hot ammonium water. In other words, hot ammonium water 1 contains oil such as tar, as well as ammonia, phenol, cyanide, hydrogen sulfide, etc. These can have a negative effect on the constituent materials, and existing adsorption chillers cannot handle them. In consideration of the case where no consideration has been taken to prevent this, hot ammonium water 1 is once introduced to a heat exchanger 2 for heat exchange, and the heat contained in the hot water is introduced to an adsorption refrigerator.

For this reason, it goes without saying that the constituent material used for the heat exchanger 2 must be selected from a material that is stable against the ammonium hydroxide 1; for example, the material used in the adsorption refrigerator 6 is If the material is stable to the ammonium chloride 1, a configuration may be adopted in which the ammonium chloride 1 is directly introduced to the adsorption refrigerator 6 without passing through the heat exchanger 2. Although the refrigerator 6 shown in FIG. 1 is of an adsorption type, it may be of an absorption type, for example, as long as it achieves the same function.

FIG. 4 is a schematic explanatory diagram showing another configuration example for carrying out the method of the present invention, and this configuration is for controlling the air temperature within the greenhouse 4. In FIG. 4, the structure other than the inside of the greenhouse 4 is the same as that shown in FIG. 1, and corresponding parts are given the same reference numerals.

In the configuration shown in FIG. 4, for example, in the summer,
(Fig. 1) According to the principle, cold water is guided to a heat exchanger 9a in the greenhouse 4, and the air in the greenhouse 4 is cooled in the heat exchanger 9a. The greenhouse 4 is cooled by being introduced from any location within the greenhouse 4.

On the other hand, in the winter, hot water is introduced directly into the heat exchanger 9a, and the air inside the greenhouse 4 is heated within the heat exchanger 9a. Air is sent to any location within the greenhouse 4 to heat the interior of the greenhouse 4. Similarly to the configuration shown in FIG.
The air temperature inside the greenhouse 4 is adjusted by a sequencer or the like in the operation panel 12, and the temperature is maintained within an appropriate range. Even in such a configuration, effective use of the calorific value of the hot ammonium water can be achieved.

[Effects of the Invention] As described above, according to the present invention, by effectively utilizing the sensible heat of hot ammonium water, which has not been used in the past, the temperature of the culture solution and the air temperature in the greenhouse can be adjusted relatively inexpensively. Moreover, a method that can be appropriately controlled has been realized.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram showing an example of the configuration for implementing the method of the present invention, Figure 2 is a diagram showing an example of a method for recovering hot ammonium water from coke oven gas, and Figure 3 is the same as shown in Figure 1. A side view of the vicinity of the greenhouse 4 of the configuration, and FIG. 4 is a schematic explanatory diagram showing another example of the configuration for implementing the method of the present invention. 1... Hot ammonium water 2,9,9a... Heat exchanger 3.8... Storage tank 4... Greenhouse 5... Culture solution 6... Adsorption refrigerator 11... Temperature Detector 12...Operation panel Figure 2 Figure 3

Claims (2)

[Claims] (1) Utilize the sensible heat of hot ammonium water obtained during spray cooling of coke oven gas to obtain cold water using an adsorption or absorption refrigerator, and guide the cold water to a heat exchanger to cool the greenhouse culture solution. Alternatively, a method for controlling the temperature of a greenhouse culture solution, characterized in that the greenhouse culture solution is heated by the heat exchanger using the sensible heat of the hot ammonium water. (2) Using the sensible heat of hot ammonium water obtained during spray cooling of coke oven gas, cold water is obtained by an adsorption or absorption chiller, and the cold water is led to a heat exchanger to generate cold air into the greenhouse. By introducing hot air into the greenhouse, the greenhouse can be cooled, or by using the sensible heat of the hot ammonium water to obtain hot air through the heat exchanger and introducing it into the greenhouse, the greenhouse can be heated. A method of controlling the air temperature in a greenhouse.