GB2567633A - Method and Apparatus for improving greenhouse cultivation - Google Patents
Method and Apparatus for improving greenhouse cultivation Download PDFInfo
- Publication number
- GB2567633A GB2567633A GB1716998.8A GB201716998A GB2567633A GB 2567633 A GB2567633 A GB 2567633A GB 201716998 A GB201716998 A GB 201716998A GB 2567633 A GB2567633 A GB 2567633A
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- flow
- carbon dioxide
- burner
- input
- oxygen
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G7/00—Botany in general
- A01G7/02—Treatment of plants with carbon dioxide
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/18—Greenhouses for treating plants with carbon dioxide or the like
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Botany (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
Abstract
The invention relates to a method for providing a CO2 enriched gas to a greenhouse comprising providing input flows of a hydrocarbon-rich gas 11, oxygen-rich gas 12, and carbon dioxide 13; combusting the input flows in a burner 2; using the products of the combustion process, the water vapour and carbon dioxide, in a boiler 3. The combustion products, water vapour and carbon dioxide, are then condensed 4 to produce a first output of liquefied water 17; and a second output 18 of gaseous carbon dioxide flow. A feedback flow 13 of gaseous carbon dioxide is extracted from the second output. The remainder of the second output flow 19 is fed to a greenhouse G. The feedback flow is supplied as the input carbon dioxide flow. The feedback flow of gaseous carbon dioxide is controlled in order to optimise the feedback flow to the burner.
Description
METHOD AND APPARATUS FOR IMPROVING GREENHOUSE CULTIVATION
Field of Invention
The present invention relates to a method and an apparatus for improving greenhouse cultivation, and more specifically a method and an apparatus for providing a CO2 enriched gas to a greenhouse.
Background of Invention
Atmospheric air has a carbon dioxide concentration of somewhere between 300 and 400 ppm. This level of carbon dioxide is adequate for plants to grow. However, when large quantities of plants are in close proximity, and in particular in confined spaces, such as for example in greenhouses, the carbon dioxide level quickly falls as the plants use up the carbon dioxide in order to perform photosynthesis. During the day, in a greenhouse having little or no ventilation and which is densely packed with plants, the carbon dioxide concentration can drop to somewhere in the region of 200ppm. At this level, the capacity for photosynthesis is reduced and growth can be stunted.
In order to improve crop yield in greenhouses, it has been a common practice for many years to enrich the air with higher levels of carbon dioxide. Increasing the level of carbon dioxide in greenhouses allow crops to improve the rate of photosynthesis of the crops, which leads to improved plant growth and vigour. Ways in which plant production in greenhouses are improved with carbon dioxide enrichment include: earlier flowering, higher fruit yields, and improved stem strength and flower size.
Known arrangement for enriching the air with CO2 include combustion of a hydrocarbon rich gaseous flow. Alternatively, a direct source of liquid carbon dioxide can be re-gasified and pumped into the greenhouse.
Methods which use the combustion of a hydrocarbon rich gaseous flow, such as natural gas or liquefied petroleum gas, with air. This can have particular drawbacks because the nitrogen in the air provides a dilution effect which negatively effects the combustion process. Further, during the combustion process nitrogen oxides are produced which contribute to the formation of smog and acid rain and are known to damage the human respiratory system.
These known arrangements have a drawback in that the maximum achievable carbon dioxide concentration at the point of injection adjacent to the plants in the greenhouse is limited. Generally, these known arrangements have been found to produce an increase in the carbon dioxide concentration adjacent to the plants which is typically limited to between 800 and 1200 ppm. This is below the ideal concentration for optimum growth.
Further, in some known arrangements, the Carbon Dioxide is significantly diluted by the nitrogen present in air used in the combustion process as the source of oxygen.
Embodiments of the invention seek to overcome some or all of these problems.
Summary of Invention
The term greenhouse is understood to mean any facility, building, room or area in which plants are cultivated and which provides some protection from ambient environmental conditions. Specifically, this refers to buildings or structures made with significant sections of glass (or equivalent). However, it will be appreciated that the invention is applicable more broadly to facilities for cultivating plants. It will be appreciated that reference is made generally to plants, and that this can cover all manner plants, including but not limited to: fruits, vegetables, flowers, tropical plants, and any plants which would grow naturally in a warmer climate.
According to the first aspect of the present invention there is provided a method for providing a CO2 enriched gas to a greenhouse comprising
a) providing input flows of a hydrocarbon-rich gas, oxygen-rich gas, and carbon dioxide;
b) combusting the input flows in a burner;
c) using the products of the combustion process, the water vapour and carbon dioxide, in a boiler;
d) condensing the combustion products, water vapour and carbon dioxide, to produce a first output of liquefied water; and a second output of gaseous carbon dioxide flow;
e) extracting a feedback flow of gaseous carbon dioxide from the second output;
f) feeding the remainder of the second output flow to a greenhouse;
suppling the feedback flow as the input carbon dioxide flow;
g) controlling the feedback flow of gaseous carbon dioxide in order to optimse the feedback flow to the burner.
Step a) may further comprise combining the input flow of oxygen-rich gas and the input flow of carbon dioxide to form a combined flow.
The method may further include step al) detecting the composition of the combined flow into the burner.
Step 1 a) may comprise determining the ratio of carbon dioxide to oxygen of the combined flow into the boiler. Step 1 a) may comprise determining the percentage by volume of carbon dioxide in the combined flow into the boiler. Step la) may comprise determining the percentage by mass of carbon dioxide in the combined flow into the boiler. Step la) may comprise determining the percentage by volume of oxygen in the combined flow into the boiler. Step 1 a) may comprise determining the percentage by mass of oxygen in the combined flow into the boiler.
Step al) may comprise detecting the ratio of input gases fed into the burner, preferably detecting a ratio of oxygen and carbon dioxide to hydrocarbon.
Step al) may comprise detecting the ratio of oxygen and carbon dioxide to hydrocarbon. Step al) may comprise detecting the ratio of the combined flow to the hydrocarbon input flow.
Step g) may comprise adjusting control valves which control the second output flow of gaseous carbon dioxide and the feedback flow of carbon dioxide.
Step g) may include controlling the feedback flow of gaseous carbon dioxide in order to obtain a composition of oxygen and carbon dioxide flowing into the burner within a target range.
The step of controlling the feedback flow of gaseous carbon dioxide may be done to achieve a target ratio of carbon dioxide to carbon dioxide in the combined input flow. The step of controlling the feedback flow of gaseous carbon dioxide may be done to achieve a target percentage by volume of carbon dioxide in the combined input flow. The step of controlling the feedback flow of gaseous carbon dioxide may be done to achieve a target percentage by mass of in the combined input flow.
The target range may be a ratio of the volume of carbon dioxide to the volume of oxygen between 40:60 and 65:35, more preferably between 55:45 and 60:40.
The target range may be an amount of carbon dioxide by volume is between 40% and 65%, more preferably, between 55% and 60%. The target range may be a ratio of the mass of carbon dioxide to the mass of oxygen between 60:40 and 67:33, more preferably between 62:38 and 65:35. The target range may be an amount of carbon dioxide by mass between 60% to 67%, more preferably between 62% and 65%.
Step g) may further include selectively controlling the following in order to obtain a composition of the input flow into the burner within a target range: the feedback flow of gaseous carbon dioxide, the input flow of oxygen-rich gas, and the input flow of hydrocarbon-rich gas.
The step of providing an input flow of gaseous hydrocarbon-rich gas may include regasifying a liquefied hydrocarbon-rich flow, such as Liquefied Natural Gas (LNG) or Liquefied Petroleum Gas (LPG).
The hydrocarbon-rich gas may comprise some or all of the following gases: methane, ethane, propane, and butane.
The method may include supplying the liquefied water to the greenhouse or make up water for the condenser cooling circuit.
According to a further aspect of the invention, there is provided an apparatus for providing a CO2 enriched gas to a greenhouse comprising:
- a burner;
- input flow lines, for supplying a hydrocarbon-rich gas, an oxygen rich gas and carbon dioxide to the burner;
- a boiler downstream of the burner;
- a condenser downstream of the boiler;
- a first output line from the condenser, for outputting a flow of carbon dioxide,
- a second output line from the condenser, for outputting a flow of water;
- a feedback line provided in the first output line, for providing a feedback flow to the burner;
- a first control valve provided in the first output line, downstream of the feedback line;
- a second control valve is provided in the feedback line; and
- a controller configured to control the flow through the first and second control valves in order to optimse the feedback flow to the burner.
The input line for supplying an oxygen rich gas and the feedback line may be combined into a combined input flow line which is fed into the burner.
The apparatus may comprise least one sensor for detecting the composition of the combined input flow into the burner.
The at least one sensor may be configured to detect at least one of the following: a ratio of carbon dioxide to oxygen of the combined flow into the boiler; a percentage by volume of carbon dioxide in the combined flow into the boiler; a percentage by mass of carbon dioxide in the combined flow into the boiler; a percentage by volume of oxygen in the combined flow into the boiler; a percentage by mass of oxygen in the combined flow into the boiler.
The apparatus may comprise a controller. The sensor may provide an input to the controller and the controller is configured to control the flow through the control valves so as control the composition of the combined input flow into the burner. The sensor may be configured to detect the ratio of input gases fed into the burner. The sensor may be configured to detect the ratio of oxygen and carbon dioxide to hydrocarbon.
The controller may be configured to control the flow through the control valves so as to achieve a target composition of oxygen and carbon dioxide in the combined input flow line.
The controller may be configured to control the flow through the control valves so as to obtain a target ratio of ratio carbon dioxide to oxygen in the combined input flow line.
The target composition may be an amount of carbon dioxide by volume between 40% and 65%, more preferably, between 55% and 60%. The target composition may be a ratio of the mass of carbon dioxide to the mass of oxygen of between 60:40 and 67:33, more preferably between 62:38 and 65:35. The target composition may be an amount of carbon dioxide by mass is between 60% to 67%, more preferably between 62% and 65%.
The controller may be configured to control the flow through the control valves so as to achieve a target ratio of the volume of carbon dioxide to the volume of oxygen between 40:60 and 65:35, more preferably between 55:45 and 60:40.
The target composition may be the amount of carbon dioxide by volume between 40% and 65%, more preferably, between 55% and 60%. The target ratio may be a ratio of the mass of carbon dioxide to the mass of oxygen between 60:40 and 67:33, more preferably between 62:38 and 65:35.
The hydrocarbon-rich gas may comprise some or all of the following gases: ethane, methane, propane, and butane. The gaseous hydrocarbon-rich gas may be a re-gasifying a liquefied hydrocarbon-rich flow, such as Liquefied Natural Gas (LNG) or Liquefied Petroleum Gas (LPG).
The invention provides a method and apparatus with which the Carbon Dioxide concentration at the point of injection into the greenhouse can be increased to an ideal value of around 1600 ppm or higher.
Whilst the invention has been described above, it extends to any inventive combination of features set out above or in the following description or drawings.
Brief Description of the Drawings
Figure 1 is a schematic arrangement according to a first embodiment of the invention;
Figure 2 is a schematic view of the burner and/or boiler of Figure 1;
Figure 3 is a schematic representation of a method according to the invention; and.
Figure 4 is a schematic showing a further embodiment.
Specific embodiments of the invention will now be described in detail by way of example only and with reference to the accompanying drawings in which:
Detailed description
FIG. 1 shows an arrangement according to an embodiment of the invention for supplying enriched CO2 to a greenhouse G. The arrangement includes: a sensor 1. a burner 2, a boiler 3, a condenser 4, a first control valve 5, a second control valve 6, a fan 7, control unit (or controller) 8, and supply lines 11 to 20.
Three input supply lines 11, 12, 13 are provided. A first input line 11 is provided for a gaseous hydrocarbon-rich flow. A second input line 12 is provided for an oxygen-rich flow. A third input line 13 is provided for a carbon dioxide rich flow. The lines 12 and 13 are combined into a combined flow line 14. The combined flow is supplied to the burner 2 along with flow in line 11.
The sensor 1 is provided in the combined flow line 14. The sensor 1 provides an input signal a for the control unit 8. The control unit 8 sends output signals b, c to control the valves 5,
6.
The supply line 15 connects the burner 2 to the boiler 3. The supply lines 16 connects the boiler 3 to the condenser 4. A first (liquid) output line 17 and a second (gaseous) output line 18 are provided from the condenser 4. The second output line 18 splits into a CO2 supply line 19 and the third input line 13. First and second control valves 5, 6 are provided in lines 19 and 13. The fan 7 is provided in supply line 13 to recirculate the gaseous flow back to the boiler input.
Further schematic details of the burner 2 and boiler 3 are shown in Figure 2. The hydrocarbon flow 11 is fed into the burner 2 two with the combined flow 14. The burner output flow passes via line 15 into the boiler 3. The boiler output flow passes via line 16 into the condenser 4, which in the example shown is a heat exchanger 4a.
The method of operation of the invention is show schematically in Figure 1 and further in the process flow diagram of Figure 3, and will be described below.
In operation, a flow of hydrocarbon-rich gas is supplied through the first input line 11. The flow of hydrocarbon-rich gas can be provided from any suitable source, including but not limited to: Liquid Natural Gas (LNG) from deep-well sources and coal seam methane, Bio-LNG (or Biogas) produced from anaerobic digestion of organic matter which also includes Landfill Gas produced from landfill, and liquefied petroleum gas (LPG). The input flow is rich in one more of the lighter hydrocarbons: methane, ethane, propane and butane. It will be appreciated that if the hydrocarbon source is a liquefied form, it is re-gasified before being supplied into the arrangement of the invention.
A flow of oxygen-rich gas is supplied to second input line 12. The oxygen-rich gas has an oxygen concentration of above approximately 95%. The oxygen-rich gas can be produced by any suitable process, including but not limited to: Pressure Swing Adsorption (PSA), Vacuum Swing Adsorption (VSA), membrane or cryogenic methods.
The oxygen-rich gas is combined with a flow of gaseous carbon dioxide (which will be described in more detail below) to form a combined flow which is fed into the burner 2 via the combined flow line 14.
The composition of the combined flow 14 is detected by the sensor 1, and this provides an input signal a to the control unit 8.
In the burner 2, the hydrocarbon-rich gas flow in supply line 11 is combusted with the mixture of oxygen-rich gas and gaseous carbon dioxide in the combined flow line 14 to form water vapour and carbon dioxide which are conveyed through line 15 into the boiler 3. The boiler 3 utilises the heat from the combustion process; and the resulting cooled water vapour and carbon dioxide are conveyed through line 16 to the condenser 4.
The condenser 4 may be of any conventional design, but is preferably a tubed fin heat exchanger or a plate shell heat exchanger
From the condenser 4, a first output of water is extracted through line 17. The water can be conveyed for further use, such as for providing a supply of water for the plants in the green house G, make up water in the operation of the condenser 4 cooling circuit or to be conveyed into a water waste outlet.
From the condenser 4, a second output of gaseous carbon dioxide is extracted through line 18. This line 18 is split into the feedback line 13 and a supply line 19. The flow in the feedback line 13 and the supply line 19 are concentrated in gaseous carbon dioxide.
The control unit 8 uses the composition data from the sensor 1 and compares to a target range or a target value. The control unit 8 then adjusts the control valves 5, 6 in order to alter the flow of gaseous carbon dioxide in order to obtain a composition of the combined carbon dioxide and oxygen flow supplied into the burner 2 which is within a target range and/or to achieve an optimized target value. The composition target range or value is can be expressed as a ratio of the two gases or as a percentage of one (or both) gases. Based on the target, the control unit 8 adjusts the control valves 5, 6 to vary the flow of carbon dioxide fed back into the combined flow line 14 in order to obtain the target ratio. The composition is measured as a ratio of carbon dioxide to oxygen. The ideal ratio of the volume of carbon dioxide to the volume of oxygen is within a range of between 40:60 and 65:35. In other words, the amount of carbon dioxide by volume is in the range 40% to 65%. A more preferable operating range of the ratio of the volume of carbon dioxide to the volume of oxygen is 55:45 to 60:40. Or, in other words the amount of carbon dioxide by volume is in the range 55% to 60%.
Alternatively, the ideal ratio of the mass of carbon dioxide to the mass of oxygen is within a range between 60:40 to 67:33. In other words the amount of carbon dioxide by mass is in the range 60% to 67%. A more preferable operating range of the ratio of the mass of carbon dioxide to the mass of oxygen is 62:38 to 65:35. Or, in other words the amount of carbon dioxide by mass is in the range between 62% and 65%.
Figure 4 shows a further embodiment in which similar components are numbered the same as in Figure 1 above. In this embodiment, valves 20 and 21 are provided in gaseous hydrocarbon-rich line 11 and oxygen rich flow line 12. A first sensor 1 a is provided in the combined flow line 14. A second sensor lb is provided in the hydrocarbon flow line 12.
The sensors la, lb provide input signals a, a’ to the control unit 8. The control unit 8 sends output signals d, e to control the valves 20, 21.
As with the embodiment above, the control unit 8 uses the composition data from the sensor la and compares to a target range or a target value. The control unit 8 then adjusts the control valves 5, 6 in order to alter the flow of gaseous carbon dioxide in order to obtain a composition of the combined carbon dioxide and oxygen flow supplied into the burner 2 which is within the target range or achieve a target value.
Additionally, the inputs from sensors la and lb can be used to optimize the ratio of hydrocarbon to carbon dioxide and oxygen. The control unit 8 controls the input flows 11 and 12 to ensure the hydrocarbon flow 11 is just less than the stoichiometric amount required to match the oxygen content of the combined flow. This ensures complete combustion and is often referred to as lean burn.
The control unit 8 operates the valves 5, 6, 20 and 21. This means that the flow of the input flows 11, 12 and the return flow 13 are all controlled in order to adjust the following compositions:
Ratio of carbon dioxide to oxygen in the combined input flow line; and
Ratio of hydrocarbon to carbon dioxide and oxygen, i.e. the composition of the gas fed into the burner.
By adjusting the compositions (ratios) of the gas supplied to the burner, the operation of the apparatus can be optimized.
In an alternative embodiment (not shown), the ratio hydrocarbon to carbon dioxide and oxygen can be controlled by a conventional volumetric ratio control specifically set up for the hydrocarbon being used
All of the invention has been described above with reference to one or more preferred embodiments. It will be appreciated that various changes or modifications may be made without departing from the scope of the invention as defined in the appended claims.
Claims (16)
1. A method for providing a CO2 enriched gas to a greenhouse comprising
a) providing input flows of a hydrocarbon-rich gas, oxygen-rich gas, and carbon dioxide;
b) combusting the input flows in a burner;
c) using the products of the combustion process, the water vapour and carbon dioxide, in a boiler;
d) condensing the combustion products, water vapour and carbon dioxide, to produce a first output of liquefied water; and a second output of gaseous carbon dioxide flow;
e) extracting a feedback flow of gaseous carbon dioxide from the second output;
f) feeding the remainder of the second output flow to a greenhouse;
suppling the feedback flow as the input carbon dioxide flow;
g) controlling the feedback flow of gaseous carbon dioxide in order to optimse the feedback flow to the burner.
2. The method according to claim 1, wherein step a) further comprises combining the input flow of oxygen-rich gas and the input flow of carbon dioxide to form a combined flow.
3. The method according to claim 1 or 2, wherein the method further includes step al) detecting the composition of the combined flow into the burner;
4. The method according to claim 3, wherein step al) further comprises detecting the ratio of input gases fed into the burner, preferably detecting a ratio of oxygen and carbon dioxide to hydrocarbon.
5. The method according to any one of the preceding claims, wherein step g) comprises adjusting control valves which control the second output flow of gaseous carbon dioxide and the feedback flow of carbon dioxide.
6. The method according to any one of the previous claims, wherein step g) includes controlling the feedback flow of gaseous carbon dioxide in order to obtain a composition of oxygen and carbon dioxide flowing into the burner within a target range.
7. The method according to claim 6, wherein the target range is a ratio of the volume of carbon dioxide to the volume of oxygen between 40:60 and 65:35, more preferably between 55:45 and 60:40.
8. The method according to claim 6 or claim 7, wherein step g) further includes selectively controlling the following in order to obtain a composition of the input flow into the burner within a target range: the feedback flow of gaseous carbon dioxide, the input flow of oxygen-rich gas, and the input flow of hydrocarbon-rich gas.
9. The method according to any one of the previous claims, wherein step of providing an input flow of gaseous hydrocarbon-rich gas may include re-gasifying a liquefied hydrocarbonrich flow, such as Liquefied Natural Gas (LNG) or Liquefied Petroleum Gas (LPG).
10. An apparatus for providing a CO2 enriched gas to a greenhouse comprising:
- a burner;
- input flow lines, for supplying a hydrocarbon-rich gas, an oxygen rich gas and carbon dioxide to the burner;
- a boiler downstream of the burner;
- a condenser downstream of the boiler;
- a first output line from the condenser, for outputting a flow of carbon dioxide,
- a second output line from the condenser, for outputting a flow of water;
- a feedback line provided in the first output line, for providing a feedback flow to the burner;
- a first control valve provided in the first output line, downstream of the feedback line;
- a second control valve is provided in the feedback line; and
- a controller configured to control the flow through the first and second control valves in order to optimse the feedback flow to the burner.
11. The apparatus according to claim 10, wherein the input line for supplying an oxygen rich gas and the feedback line are combined into a combined input flow line which is fed into the burner.
12. The apparatus according to claim 11, further comprising at least one sensor for detecting the composition of the combined input flow into the burner.
13. The apparatus according to claim 12, further comprising a controller, and wherein the sensor provides an input to the controller and the controller is configured to control the flow through the control valves so as control the composition of the combined input flow into the burner.
14. The apparatus according to claim 13, wherein the controller is configured to control the flow through the control valves so as to achieve a target composition of oxygen and carbon dioxide in the combined input flow line.
15. The apparatus according to claim 13 or 14, wherein the controller is configured to control the flow through the control valves so as to obtain a target ratio of ratio carbon dioxide to oxygen in the combined input flow line.
16. The apparatus according to claim 15, wherein the controller is configured to control the flow through the control valves so as to achieve a target ratio of the volume of carbon dioxide to the volume of oxygen between 40:60 and 65:35, more preferably between 55:45 and 60:40.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1716998.8A GB2567633A (en) | 2017-10-16 | 2017-10-16 | Method and Apparatus for improving greenhouse cultivation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1716998.8A GB2567633A (en) | 2017-10-16 | 2017-10-16 | Method and Apparatus for improving greenhouse cultivation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201716998D0 GB201716998D0 (en) | 2017-11-29 |
| GB2567633A true GB2567633A (en) | 2019-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1716998.8A Withdrawn GB2567633A (en) | 2017-10-16 | 2017-10-16 | Method and Apparatus for improving greenhouse cultivation |
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| GB (1) | GB2567633A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120070401A (en) * | 2010-12-21 | 2012-06-29 | 서울대학교산학협력단 | Apparatus to generate carbon dioxide for greenhouse |
| WO2014010561A1 (en) * | 2012-07-10 | 2014-01-16 | 株式会社デンソー | Carbon dioxide supply device |
| KR101454416B1 (en) * | 2014-01-17 | 2014-11-04 | 주식회사 지앤아이솔루션 | Method and apparatus for supplying exaust gas from combustion apparatus to plants growing facility |
| JP2017073989A (en) * | 2015-10-13 | 2017-04-20 | 東京瓦斯株式会社 | Plant growth promoting apparatus |
-
2017
- 2017-10-16 GB GB1716998.8A patent/GB2567633A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120070401A (en) * | 2010-12-21 | 2012-06-29 | 서울대학교산학협력단 | Apparatus to generate carbon dioxide for greenhouse |
| WO2014010561A1 (en) * | 2012-07-10 | 2014-01-16 | 株式会社デンソー | Carbon dioxide supply device |
| KR101454416B1 (en) * | 2014-01-17 | 2014-11-04 | 주식회사 지앤아이솔루션 | Method and apparatus for supplying exaust gas from combustion apparatus to plants growing facility |
| JP2017073989A (en) * | 2015-10-13 | 2017-04-20 | 東京瓦斯株式会社 | Plant growth promoting apparatus |
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| Publication number | Publication date |
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| GB201716998D0 (en) | 2017-11-29 |
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