JP2001292641A - Apparatus for feeding carbon dioxide gas in greenhouse or plastic greenhouse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an operating cost by carrying out the feed of carbon dioxide gas to cultivated crops in a greenhouse by combining a bomb with a means for utilizing combustion waste gas of a boiler in heating installation. SOLUTION: A part of a combustion waste gas of a hot-water-type boiler 1 is taken out by a branching tube 5 installed in a chimney 10, and a sucking fan 6 having a sucking opening connected thereto, and diluted with outside air taken in from the air intake of an air-intake tube 7 connected to the midway of the branching tube 5 to form a feeding air having a prescribed concentration of the carbon dioxide. The resultant feeding air is fed from an ejecting opening of a sucking fan through an air-sending tube to the interior of the greenhouse. When the operation of the boiler is stopped according to the increase of the room temperature in daytime, and the concentration of the carbon dioxide gas in the greenhouse is decreased, a motor-operated valve SV installed in an ejecting tube of a bomb 8 is opened by the operation of a carbon dioxide gas sensor S3 for detecting the decrease of the concentration to eject the carbon dioxide gas to the air-intake tube so as to be fed into the greenhouse after being diluted to the prescribed concentration with the outside air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cultivating crops in a greenhouse or a house in order to increase the size of the crops grown in the greenhouse or a house, to activate the crops themselves, and to improve the productivity. The present invention relates to a carbon dioxide supply device for feeding carbon dioxide into a greenhouse or house in a cultivation technique for supplying carbon dioxide to crops.

[0002]

2. Description of the Related Art Cultivation of crops in greenhouses and houses is usually carried out.
Since the crop grows in a closed room to the outside, it is affected by the concentration of carbon dioxide necessary for growing the crop in the indoor air.

[0003] Carbon dioxide gas is usually present in the atmosphere in an amount of about 320 ppm, but it has been found that an effect of activating crops and improving growth appears when it is present at a concentration higher than 320 ppm. Until the concentration of carbon dioxide reaches the concentration, the effect appears as the concentration is increased.
When it exceeds 00 mmp, the effect is not improved and only a certain effect is achieved, but it has been found that no problem is caused.

Therefore, in order to improve productivity, cultivation techniques for actively applying carbon dioxide to crops cultivated in a greenhouse have begun to spread.

[0005] As means for applying this carbon dioxide gas to cultivated crops in a greenhouse, a cylinder filled with high-pressure compressed carbon dioxide gas is installed in a greenhouse, and a certain amount is supplied from a mouth of the cylinder through a regulator through a regulator. There is a method of supplying carbon dioxide to a crop cultivated in the greenhouse at a concentration higher than the atmospheric concentration by releasing carbon dioxide into the greenhouse.

[0006] In addition, by utilizing the combustion exhaust gas of a boiler in a heating facility for heating a greenhouse by circulating hot water boiled by a boiler incorporating a burner for burning a gas fuel such as propane gas into a greenhouse by piping. There is a means for diluting the combustion exhaust gas in the atmosphere to supply introduced carbon dioxide of about 600 ppm and blowing it into the greenhouse to supply the carbon dioxide to the crops in the greenhouse.

[0007]

In the cultivation technique of applying carbon dioxide gas in order to improve the productivity of cultivated crops in a greenhouse, the conventional means for supplying carbon dioxide gas uses a cylinder filled with carbon dioxide gas in a greenhouse. In the means for installing carbon dioxide and then releasing carbon dioxide gas, the carbon dioxide gas packed in the cylinder is as high as about 100 yen per kg,
There is a problem that operating costs are increased when the cost is about ¥ 100,000.

[0008] In the means utilizing the combustion exhaust gas of the boiler in the heating facility of the greenhouse, the cost of purchasing carbon dioxide is unnecessary, and the operating cost for supplying carbon dioxide can be significantly reduced. Even if the room temperature is cold, it is possible to keep the room temperature in a predetermined temperature range even if the boiler is not operated by the sunshine during sunny days, so that the boiler will only operate about half the daytime, When this boiler is not operating, the supply of carbon dioxide gas is cut off,
During the daytime when the boiler stops operating,
There is a problem in that the demand for carbon dioxide in crops increases, resulting in a shortage of carbon dioxide.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the conventional means, and uses a means for discharging carbon dioxide gas from a cylinder and a combustion exhaust gas from a boiler in a heating facility. Means to supply carbon dioxide from the cylinder when the operation of the boiler is stopped, so that the operation of the boiler in the heating facility can be performed while reducing the operating costs by purchasing carbon dioxide. It is an object of the present invention to provide a new means for preventing a shortage of carbon dioxide gas at a time when there is sunlight during the day when the vehicle is stopped.

[0010]

Means for Solving the Problems In the present invention, as a means for achieving the object of the cow, a part of the combustion exhaust gas of a hot water supply type boiler for heating the interior of a greenhouse or a house is used. Introduce a prescribed concentration of carbon dioxide by extracting with a branch pipe provided in the chimney and a suction fan connected to the intake pipe and diluting with the outside air taken in from the air intake of an air intake pipe connected in the middle of the branch pipe. As air is supplied from the air outlet of the suction fan to the greenhouse via the air supply pipe, when the boiler stops operating due to the rise in room temperature due to the daytime sunlight and the carbon dioxide concentration in the greenhouse decreases, The electric valve provided on the discharge pipe of the cylinder is controlled to open by the operation of the carbon dioxide gas sensor for detecting this, and carbon dioxide gas is discharged from the discharge port of the discharge pipe to the air intake port. Is diluted to a predetermined concentration in the ambient air by the operation of the suction fan is to raise the carbon dioxide gas supply device in a greenhouse, house, characterized in that so as to feed into the greenhouse.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The means for supplying carbon dioxide in a greenhouse or house according to the present invention is a method of circulating hot water boiled in a boiler through a heat exchanger disposed in the room of the greenhouse or house by piping. Means for using the flue gas of a boiler of a hot water supply type heating facility for heating the interior of a room, diluting it with the atmosphere, and introducing the diluted gas into a greenhouse / house;
A combination of the two means of purchasing carbon dioxide gas compressed into high pressure and filling the cylinder, releasing the carbon dioxide gas sealed in the cylinder and supplying it to cultivated crops in the greenhouse is used.

[0012] The boiler of the hot water supply type heating facility used for this is a type in which a burner for boiling the hot water burns gas fuel.

A branch pipe is connected to the chimney of the boiler, which discharges the gas combustion exhaust gas of the gas fuel burned by the burner into the atmosphere, and a suction fan is connected to the tip of the branch pipe. The intake port is connected, and a part of the combustion exhaust gas discharged from the chimney is sucked by the operation of the suction fan and discharged from the discharge port, but the degree of opening can be adjusted freely in the middle of this branch pipe. A damper and a throttle are provided, and an air intake pipe that opens to the atmosphere is connected to a part closer to the intake port of the suction fan than these dampers and throttles. The exhaust gas is diluted to a desired ratio by the air taken in from the air intake pipe, so as to be discharged from the outlet of the suction fan,
This is guided into the greenhouse by an air supply pipe connected to the air outlet, and is discharged there.

In order to release carbon dioxide from the cylinder filled with carbon dioxide, an electric valve such as an electromagnetic valve and a regulator are connected to a discharge pipe connected to the opening of the cylinder, and the carbon dioxide at the tip of the discharge pipe is discharged. The gas discharge port faces the air intake port of the air intake pipe connected to the branch pipe that extracts part of the flue gas from the chimney described above, and the carbon dioxide gas released from the discharge port of the discharge pipe by opening the electric valve The raw gas is sucked from the air inlet together with the air taken into the suction fan, diluted to a predetermined concentration, and introduced into the greenhouse via the air supply pipe connected to the air blowing port of the suction fan.

A temperature sensor for detecting room temperature and a carbon dioxide gas sensor for detecting carbon dioxide concentration are provided in the greenhouse, and the operation of the boiler is turned on / off by the detection of the room temperature by the temperature sensor. In conjunction with this, the on / off operation of the motor for driving the suction fan is controlled, and the operation of detecting the concentration of carbon dioxide in the greenhouse by the carbon dioxide sensor opens the electric valve provided in the discharge pipe of the cylinder. , And at the same time, the motor for driving the suction fan is controlled to be turned on.

As a result, when the temperature of the room rises, the operation of the boiler stops, and when the concentration of carbon dioxide in the greenhouse decreases, the valve is opened to release carbon dioxide from the cylinder. The air is supplied into the greenhouse as air having a predetermined carbon dioxide concentration through the air supply pipe.

[0017]

Next, an embodiment will be described with reference to the drawings. FIG. 1 is an explanatory view of a carbon dioxide gas supply device in a greenhouse / house used for carrying out the means of the present invention, which is partially broken and developed. In FIG. 1, reference numeral 1 denotes a boiler and 2 denotes a greenhouse.

The boiler 1 is a hot water boiler incorporating a burner for burning gas fuel such as propane gas.
Numeral 0 denotes a chimney for discharging the combustion exhaust gas from the burner to the atmosphere.

3 is a hot water supply pipe for circulating hot water boiled by the boiler 1 to a heat exchanger 20 disposed in the greenhouse 2.
It comprises a hot water supply pipe 30 for sending out hot water by the pump P and a return pipe 31.

The operation of the burner of the boiler 1 is such that the room temperature detected by the temperature sensor S1 disposed in the greenhouse 2 is adjusted to a desired temperature set in the control unit 4 mounted on the outer surface of the greenhouse 2. When the temperature falls within the range, the temperature is controlled to be turned on and off, whereby the room temperature in the greenhouse 2 is maintained in a desired temperature range.

Reference numeral 5 denotes a branch pipe having a proximal end connected to the middle of the chimney 10, and an intake port 6a of a suction fan 6 operated by a motor M1 is connected to a distal end of the branch pipe. The air port 6 b is connected to the greenhouse 2 through an air supply pipe 60.
The operation of the motor M1 of the suction fan 6 is controlled on and off in conjunction with the operation of the burner controlled by the temperature sensor S1.

Reference numeral 50 denotes a damper provided at a position close to the base end side of the branch pipe 5, the opening of which is controlled as desired by the operation of the motor M2. The valve is fully opened when the CO concentration detected by the detection sensor S2 is 3 ppm or less.

Reference numeral 51 denotes a throttle provided at a portion of the branch pipe 5 closer to the distal end side than the damper 50, and reference numeral 7 denotes an air intake pipe connected to the branch pipe 5 at a base end at a location further closer to the distal end side than the throttle 51. The front end side is opened to the atmosphere as an air inlet 70.

When the suction fan 6 is operated to extract a part of the flue gas from the chimney 10 to the branch pipe 5, the above-described operation of the damper 50, the throttle 51 and the air intake pipe 7 is based on the operation of the flue gas extracted from the chimney 10. The amount is reduced to 150 to 200 times smaller than the amount of outside air taken in from the air intake pipe 7, whereby the exhaust gas is diluted 150 to 200 times with the outside air taken in from the air inlet 70, and usually, 29 times.
At a temperature of about 0 ° C., CO ₂ = 10.7% (107000
ppm) and CO = 100 ppm, the exhaust gas discharged to the chimney 10 was cooled to a temperature of 30 ° C. and CO ₂ = 600.
Introduced air of about ppm, CO = 0.4 ppm is supplied into the greenhouse 2.

Numerals 8 are cylinders in which carbon dioxide gas is compressed and filled at a high pressure, and are installed side by side at a position near the boiler 1 installed outside the greenhouse 2. The outlet tube 80 is connected to the opening of the container via a coupler 81. The discharge pipe 80 has a discharge port 82 at the distal end thereof facing the air intake 70 of the air intake pipe 7 connected to the branch pipe 5 described above. The actuated electric valve SV and the regulator 84 are connected, and by opening the electric valve SV, the carbon dioxide gas adjusted to a predetermined amount from the discharge port 82 at the tip is supplied to the air inlet 6 a of the branch pipe 5. It is made to be released to.

The motor-operated valve SV is configured such that the detection value detected by the carbon dioxide sensor S3 for detecting the concentration of carbon dioxide provided in the greenhouse 2 is desirably set in the control unit 4 described above. When it is detected that the concentration has dropped below the concentration of carbon dioxide, the control circuit provided in the control unit controls the valve opening operation. At this time, the motor M1 for driving the suction fan 6 that connects the suction port 6a to the branch pipe 5 is turned off in conjunction with the operation of the boiler 1 when the operation of the boiler 1 is stopped due to a rise in room temperature. When the above-mentioned carbon dioxide sensor S3 detects a decrease in the carbon dioxide concentration in the greenhouse, it is controlled so that the detection signal is turned on as a request signal.

Thus, in this embodiment, when the room temperature in the greenhouse 2 is maintained in a predetermined temperature range by the hot water circulated by being boiled by the operation of the boiler 1, the chimney 10 of the boiler 1 A part of the burner exhaust gas discharged from the burner is drawn out by the suction fan 6 and the air intake port 7
Diluted with outside air taken from 0, carbon dioxide concentration is 600pp
m, and is supplied into the greenhouse 2 as introduced air having a condition of about m, and the boiler 1 is turned off when the room temperature rises due to the daytime sunlight. When the amount of carbon dioxide decreases, the electric valve SV is opened by the detection operation of the carbon dioxide sensor S3, and the carbon dioxide in the cylinder 8 is removed from the air intake pipe 7 for diluting the exhaust gas from the boiler 1. The air is discharged to the inlet 70, is sucked together with the outside air by the operation of the suction fan 6, becomes air diluted to a predetermined concentration, is sent into the greenhouse 2 through the air supply pipe 60, and is supplied with carbon dioxide gas. The room temperature is lowered by the outside air, so that the operation timing of the boiler 1 is advanced.

[0028]

As described above, the greenhouse according to the present invention
Means for supplying carbon dioxide to cultivated crops in a house usually include a branch pipe provided in a chimney of the boiler and a suction pipe for connecting a part of the combustion exhaust gas of a hot water supply type boiler for heating the interior of a greenhouse or a house. The air is drawn out by a fan, diluted with the outside air taken in from an air intake pipe provided in a branch pipe, and supplied into the greenhouse as an introduction air having a predetermined carbon dioxide gas concentration through an air supply pipe connected to a discharge port of a suction fan. When the operation of the boiler is stopped due to the rise in room temperature due to the daytime sunlight and the concentration of carbon dioxide in the greenhouse is decreasing, the electric valve is opened by the control operation of the carbon dioxide sensor provided in the greenhouse. The carbon dioxide gas in the cylinder is released to the air inlet provided in the branch pipe described above, and is sucked together with the outside air by the suction fan described above, and the carbon dioxide gas is introduced into the air having a predetermined concentration. Since it is diluted and sent to the greenhouse through the above-mentioned air supply pipe, carbon dioxide is supplied to the cultivated crops in the greenhouse by using the combustion exhaust gas of the boiler, which is inexpensive to purchase In this way, the shortage of carbon dioxide gas during the daytime when the boiler stops operating can be eliminated, and the operating cost burden of purchasing and using carbon dioxide gas packed in cylinders , And the raw carbon dioxide gas released from the cylinder can be diluted to a predetermined concentration and fed into the greenhouse accurately.

[Brief description of the drawings]

FIG. 1 is a partially exploded development view of a carbon dioxide gas supply device in a greenhouse / house used for implementing the means of the present invention.

[Explanation of symbols]

p: pump, S1: temperature sensor, S2: CO detection sensor, S3: carbon dioxide sensor, M1, M2, M3: motor, SV: electric valve, 1: boiler, 10: chimney, 2: greenhouse, 20: heat exchanger 3, hot water supply pipe, 30: hot water supply side pipe, 31: return side pipe, 4 ... control unit, 5 ... branch pipe, 50
… Damper, 51… throttle, 6… suction fan, 6a… intake port, 6b… exhaust port, 60… air supply pipe, 7… air intake pipe, 7
1 ... air inlet, 8 ... cylinder, 80 ... discharge pipe, 81 ... coupler, 82 ... discharge port, 84 ... regulator.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2B022 DA12 DA13 DA15 2B029 JA02 JA04 JA06 3J071 AA02 BB01 BB14 CC03 DD26 EE02 EE28 FF16

Claims (1)

[Claims] 1. A part of the combustion exhaust gas of a hot water supply type boiler for heating the interior of a greenhouse or house is drawn out by a branch pipe provided in a chimney of the boiler and a suction fan connected to an intake port of the boiler. It is diluted with the outside air taken in from the air intake of the air intake pipe connected on the way, and is supplied into the greenhouse through the air supply pipe from the air outlet of the suction fan as air with a predetermined carbon dioxide concentration through the air outlet. When the boiler stops operating due to the rise in room temperature due to the sunlight in the middle and the concentration of carbon dioxide in the greenhouse decreases, the operation of the carbon dioxide sensor that detects this causes the motor-operated valve provided on the discharge pipe of the cylinder to open. So that carbon dioxide gas is discharged from the discharge port of the discharge pipe to the air intake port, and is diluted to a predetermined concentration with outside air by the operation of the suction fan to be supplied into the greenhouse. A carbon dioxide gas supply device in a greenhouse / house.