System for improving saline-alkali soil by using industrial carbon dioxide and method for promoting yield increase of eggplant pod vegetables by using system

Abstract

The invention relates to an industrial carbon dioxide improved saline-alkali soil system and a method for promoting yield increase of solanaceous pods by using the system, the industrial carbon dioxide improved saline-alkali soil system is used for transforming a land parcel, a drip irrigation belt and a film are laid through an under-film drip irrigation seeder, the width of the film is 115 cm, a mode of one film, two pipes and two rows is adopted, the drip irrigation belt is laid on the edge of a planting row, the row spacing is 80 cm + 60 cm, and the film is laid on the edge of the planting row; the plant spacing is set according to the requirement of varieties for density, irrigation is conducted after transplanting, the water amount is 450 m < 3 > / hm < 2 >, first-time irrigation and topdressing are conducted in combination with irrigation when a second spike fruit grows to be in the size of walnuts, irrigation is conducted once every 7-9 days later, and topdressing is conducted once when a fourth spike fruit and a sixth spike fruit expand in combination with irrigation. 5 kg of diammonium phosphate, 3 kg of potassium sulfate or 8 kg of ternary composite water-soluble fertilizer is dressed every 667 m < 2 > every time, from the first time of irrigation and topdressing, a carbon dioxide aqueous solution can be dripped during irrigation every time, and the use amount of carbon dioxide every time is 3-5 kg / 667 m < 2 >.

Description

Technical Field

[0001] The invention technology belongs to the field of agriculture, in particular to a technology for applying carbon dioxide in agriculture. Background Art

[0002] Whether it is grain crops or vegetables, their fruits are mostly composed of carbohydrates, with very little trace elements. The formation of carbohydrates requires "gas (carbon dioxide), water, and light", that is, photosynthesis. Carbon dioxide is the main raw material for photosynthesis of crops. Insufficient carbon dioxide will cause vegetable growth to stagnate, affecting yield and quality.

[0003] Take eggplant vegetables as an example: during the day, under the sunlight, the leaves accumulate carbohydrates through photosynthesis; at night, the leaves distribute the carbohydrates stored during the day through aerobic respiration, a small part of which is transported to the roots and the plant for use in the development of the root system and the plant, and the vast majority of the rest is transported to the fruit. This cycle repeats itself, causing the plants to gradually grow taller and the yield to gradually form.

[0004] Vegetables with sufficient CO2 have strong plant growth, high chlorophyll content, and dark green and shiny leaves; vegetables lacking CO2 have dull leaves and poor plant growth. Vegetables with sufficient CO2 bloom early, have more female flowers, and fewer fallen flowers and fruits; vegetables lacking CO2 bloom late, have fewer female flowers, and are uneven. Vegetables with sufficient CO2 have regular fruits, go on the market early, and have high yields; vegetables lacking CO2 have more irregular fruits, go on the market 2-3 days later, have low yields, and have fewer high-quality fruits.

[0005] Chinese Patent 202111034654.2 discloses a "greenhouse method for cultivating cherry tomatoes in rotation with fresh peanuts in autumn and winter", which uses two crops for rotation cultivation: fresh peanuts are first planted in autumn and winter, and cherry tomatoes are raised in other greenhouses in winter. After the fresh peanuts are picked during the Spring Festival, the cherry tomatoes are transplanted to the greenhouse on the same plot. The fresh peanut cultivation steps include core steps such as variety selection, seed treatment, and cultivation technology; the cherry tomato cultivation steps include core steps such as variety selection, seed seedling cultivation, and cultivation technology. The present invention adopts a greenhouse three-film covering to rotate cherry tomatoes with peanuts in autumn and winter. On the one hand, it breaks the continuous cropping obstacles and comprehensively utilizes the utilization rate of greenhouse facilities; on the other hand, it provides a comprehensive planting plan for fresh peanuts and cherry tomatoes, improves the utilization rate of greenhouse facilities, and has positive significance for improving farmers' income as a whole, and also provides farmers with a new greenhouse efficient planting model.

[0006] The above technology has obvious limitations and can only be applied to greenhouse vegetable technology. Summary of the invention

[0007] The industrial carbon dioxide improving saline-alkali land system of the present invention solves the technical problems existing in the prior art such as being applicable to greenhouse vegetables.

[0008] The method for increasing the yield of eggplant and pod vegetables by improving saline-alkali land system with industrial carbon dioxide in the present invention solves the technical problems existing in the prior art such as being applicable to greenhouse vegetables, and makes full use of industrial carbon dioxide, reduces direct carbon dioxide emissions, avoids waste of carbon resources, and achieves the purpose of increasing the yield of eggplant and pod vegetables.

[0009] The idea of ​​the present invention is to use industrial carbon dioxide to dissolve in water to form an acidic aqueous solution to neutralize the salt and alkali in the soil and discharge the salt and alkali out of the cultivated land through a salt discharge device, so as to achieve the purpose of completely improving the saline-alkali land. There is no problem of alkali return, because carbon dioxide is used to form an acidic aqueous solution, which reduces the emission of carbon dioxide and achieves waste gas utilization. A part of the overflowed carbon dioxide gas promotes the photosynthesis of eggplant pod vegetables under membrane drip irrigation, promotes the increase of eggplant pod vegetables, and achieves the purpose of reducing carbon, reducing costs and increasing efficiency.

[0010] In order to achieve the above-mentioned purpose, an industrial carbon dioxide system for improving saline-alkali land is adopted, which includes: a liquid carbon dioxide storage device, a carbon dioxide water dissolving device, a control device, a drip irrigation system and a salt discharge device; the above-mentioned drip irrigation system includes a head and a pipe network; the above-mentioned liquid carbon dioxide storage device is connected to the carbon dioxide water dissolving device through a pipe and is connected to the control device; the carbon dioxide water dissolving device is connected to the drip irrigation system through a pipe and is connected to the control device; the salt discharge device is arranged below the tillage layer and discharges the soil washing liquid.

[0011] Furthermore, in the industrial carbon dioxide improving saline-alkali land system, the carbon dioxide dissolving device comprises:

[0012] The cylinder body has two open ends connected to a circular steel pipe with flanges, the middle position of the top of the circular steel pipe is connected to the exhaust port, and the middle position of the side of the circular steel pipe near the water inlet is connected to the air inlet;

[0013] The air inlet is fixed in the middle of the side of the cylinder near the water inlet end by threading. The air inlet is connected to the air inlet pipe, check valve, air inlet pressure gauge, air inlet valve, and air inlet connection parts from the inside to the outside. The air inlet pipe is located inside the circular steel pipe, and the end can be extended into the pipe at the head of the drip irrigation system.

[0014] Exhaust port: The exhaust port is fixed at the middle position of the top end of the circular steel pipe by means of thread connection, and is connected to the pressure gauge and the exhaust valve from the inside to the outside in sequence.

[0015] Preferably, the air inlet pipe is located inside the cylinder and is a spiral tube with one end closed, and the spiral diameter is 1 / 3 to 2 / 3 of the inner diameter of the cylinder.

[0016] Preferably, the air intake pipe is composed of two layers, the inner layer is a polyvinyl chloride layer with circular small holes with a pore size of 0.3-0.5 mm for air intake, and the outer layer is a polypropylene layer with a microporous structure.

[0017] Furthermore, the drip irrigation system includes a drip irrigation belt; the flow rate of the drip irrigation belt is 1.0-2.8L / h, and an anti-reverse diffusion mechanism is provided on the flow channel. The mechanism can prevent the small amount of carbon dioxide gas precipitated due to the pressure reduction of the acidic aqueous solution entering the flow channel from flowing back, and continue to move forward with the water flow, and further dissolve into the water after the contact time is prolonged.

[0018] Furthermore, the salt discharge device is a salt discharge seepage pipe, which is a plurality of seepage pipes laid in parallel, with a diameter of 110-300 mm, a spacing of 25-35 meters, and a top of the seepage pipe 50-100 cm from the ground surface.

[0019] Furthermore, the salt discharge device is a salt discharge culvert, which is a plurality of parallel culverts with a width of 110-300 mm, a spacing of 25-35 meters, and a top of the culvert 50-100 cm from the ground surface.

[0020] Furthermore, the industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device, a decarbonization device, a regeneration device, a desulfurization device, and a cooling and liquefaction device. The liquid carbon dioxide obtained after being treated by the above-mentioned industrial waste gas treatment system is stored in a carbon dioxide storage device, and the carbon dioxide concentration is not less than 95%.

[0021] Furthermore, the industrial carbon dioxide improving saline-alkali land system also includes a laid ground film.

[0022] The method for improving saline-alkali land system and increasing the yield of eggplant pod vegetables by using industrial carbon dioxide comprises the following steps:

[0023] 1) Determine the pH value of soil and water sources to determine whether it is saline-alkali land, and design and determine the system and plan for improving saline-alkali land with industrial carbon dioxide;

[0024] 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system;

[0025] 3) Seedling raising and transplanting: Select eggplant pod vegetable varieties that are early-maturing, disease-resistant, cold-resistant, fruit-intensive, high-yielding, and resistant to transportation. Start raising seedlings in the greenhouse in early March. When the ground temperature 5 cm below the film is stable at above 15°C, transplanting can be carried out. Use a drip irrigation seeder under the film to lay the drip irrigation tape and film. The film width is 115 cm. A mode of one film, two tubes, and two rows is adopted. The drip irrigation tape is laid on the edge of the planting row. The row spacing is 80 cm + 60 cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after transplanting. Keep the soil moist in the early stage without water accumulation. The water volume is 450m3 / hm 2 When the second bunch of fruits grows to the size of walnuts, the first irrigation and topdressing are carried out in combination with irrigation. After that, water is generally irrigated once every 7-9 days. Combined with irrigation, topdressing is carried out once when the fourth and sixth bunches of fruits swell, respectively. Each time, every 667m 2 Topdress with 5kg of diammonium phosphate, 3kg of potassium sulfate or 8kg of ternary compound water-soluble fertilizer;

[0026] 4) preparing an acidic aqueous solution: measuring the soil pH value after irrigation in 3), using a conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution, combining the growth habits of eggplant vegetables, soil environmental requirements and water demand patterns, referring to the water source pH value measured in 1), using a pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolving the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide water dissolving device after reducing the pressure by a control device according to the amount, to form an acidic aqueous solution with the above pH value;

[0027] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution into the drip irrigation system through the control device for application. Starting from the first irrigation and topdressing, drip application of carbon dioxide aqueous solution can be performed during each irrigation. The amount of carbon dioxide applied each time is 3-5kg / 667m 2 ;

[0028] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0029] Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: determine the pH value of the acidic aqueous solution when the acidic aqueous solution is applied this time based on the soil pH value measured before the acidic aqueous solution is applied, and determine the amount of carbon dioxide added when the acidic aqueous solution is applied this time based on the pH value of the acidic aqueous solution applied this time.

[0030] Furthermore, in the 4) preparation of the acidic aqueous solution, when the industrial carbon dioxide in the carbon dioxide storage device is dissolved in the water of the carbon dioxide water dissolving device after being decompressed by the control device, the solenoid valve at the water inlet end is started by the DCS control cabinet, and the internal pressure of the carbon dioxide water dissolving device is controlled at 0.05-0.40MPa. The pressure reducing valve at the air inlet end of the carbon dioxide water dissolving device is adjusted, and the air inlet pressure of the carbon dioxide water dissolving device is not lower than the internal pressure of the carbon dioxide water dissolving device, which is controlled at 0.055-0.405MPa.

[0031] Furthermore, in the drip application of the acidic aqueous solution in step 5), when the acidic aqueous solution prepared in step 4) is added to the drip irrigation system through the control device for application, the outlet solenoid valve is started through the DCS control cabinet to control the aboveground pipe network pressure of the drip irrigation system to 0.05-0.15 MPa.

[0032] Furthermore, the method of using industrial carbon dioxide to improve saline-alkali land system to promote eggplant and pod vegetable production also includes using an industrial waste gas treatment system to prepare carbon dioxide, and the industrial waste gas passes through a carbon monoxide conversion device, a decarbonization device, a regeneration device, a desulfurization device, and a cooling and liquefaction device to obtain liquid carbon dioxide and store it in a carbon dioxide storage device, and the carbon dioxide concentration is not less than 95%.

[0033] The industrial carbon dioxide referred to in the present invention refers to carbon dioxide prepared using waste gas generated in industrial production as raw material, specifically refers to waste gas containing carbon monoxide and carbon dioxide, mainly including waste gas generated by coal chemical industry, petrochemical industry, chlor-alkali chemical industry, steelmaking and fermented wine processing industries.

[0034] If the industrial carbon dioxide system for improving saline-alkali land and the method of using the system to reduce carbon emissions and increase production can be implemented on large areas of salinized land, carbon resources can be comprehensively utilized to improve soil salinization and promote crop yields.

[0035] The industrial carbon dioxide improvement saline-alkali land system and the method for using the system to promote the increase of eggplant and pod vegetable production are simple to operate. The existing water-saving drip irrigation system is used, and the acidic aqueous solution containing carbon dioxide is applied to the crop root layer soil along with the drip irrigation system, which can not only improve soil salinization and make the pH value and total salt content of the soil change significantly, but also use the bicarbonate ions of the carbon dioxide aqueous solution to neutralize the alkali metal ions in the soil to form bicarbonate salt water that is easy to move with water, and move with water to the salt discharge device, thereby being discharged from the soil, and finally improving the crop root layer soil, while the carbon dioxide aqueous solution analyzes carbon dioxide in the middle of the root soil of eggplant and pod vegetables. Due to the covering effect of the mulch film, the precipitated carbon dioxide is trapped in the soil root layer and absorbed by the root system of eggplant and pod vegetables, thereby promoting the photosynthesis of eggplant and pod vegetables and promoting the increase of the production and efficiency of eggplant and pod vegetables.

[0036] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In the figure, 1 is a header, 2 is a carbon dioxide dissolving device, 21 is a cylinder, 211 is a circular steel pipe, 212 is a flange, 213 is a screw, 22 is an exhaust port, 221 is a pressure gauge, 222 is an exhaust valve, 23 is an air inlet, 231 is an air inlet pressure gauge, 232 is an air inlet valve, 233 is an air inlet connecting component, 234 is a check valve, 235 is an air inlet pipe, 2351 is a polyvinyl chloride layer with circular small holes for air inlet, 2352 is a polypropylene layer with a microporous structure, 24 is a water inlet end, 25 is a water outlet end, 3 is a pipe network, 31 is a drip irrigation belt, 4 is a salt discharge device, 41 is a leakage pipe, 42 is a salt discharge ditch, 8 is a liquid carbon dioxide storage device, 91 is a control device, 92 is a pressure reducing valve, 93 is an electromagnetic valve, 10 is a carbon monoxide conversion device, 11 is a decarbonization device, 12 is a regeneration device, 13 is a desulfurization device, and 14 is a cooling and liquefaction device

[0038] Figure 1 This is a schematic diagram of the connection of an industrial carbon dioxide improved saline-alkali land system;

[0039] Figure 2 It is a schematic diagram of the overall structure of a carbon dioxide gas dissolving water device;

[0040] Figure 3 This is a schematic diagram of the air inlet pipe structure of the carbon dioxide gas dissolving device;

[0041] Figure 4 It is a schematic cross-sectional view of an air inlet pipe of a device for dissolving carbon dioxide gas in water;

[0042] Figure 5 This is a schematic diagram of the arrangement of the salt leakage pipe;

[0043] Figure 6 This is a schematic diagram of the layout of the salt drainage culvert;

[0044] Figure 7 Schematic diagram of the connection of the industrial carbon dioxide improved saline-alkali land system including the industrial waste gas treatment system. DETAILED DESCRIPTION

[0045] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation, structure, characteristics and effects of an industrial carbon dioxide improved saline-alkali land system and a method for increasing crop yield using the system proposed by the present invention are described in detail below in combination with the preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0046] Example 1

[0047] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 An industrial carbon dioxide system for improving saline-alkali land includes a liquid carbon dioxide storage device 8, a carbon dioxide water dissolving device 2, a control device, a drip irrigation system and a salt discharge device 4; the above-mentioned drip irrigation system includes a head 1 and a pipe network 3; the above-mentioned liquid carbon dioxide storage device 8 is connected to the carbon dioxide water dissolving device 2 through a pipeline and is connected to the pressure reducing valve 92 of the control device 91; the carbon dioxide water dissolving device 2 is connected to the drip irrigation system through a pipeline and is connected to the solenoid valve 93 of the control device 91; the salt discharge device 4 is arranged below the tillage layer and discharges the soil washing liquid.

[0048] The carbon dioxide dissolving device is a cylinder 21, a circular steel pipe 211 with flanges 212 connected to two open ends, an exhaust port 22 connected to the middle of the top of the circular steel pipe 211, and an air inlet 23 connected to the middle of the side of the circular steel pipe 211 near the water inlet end;

[0049] The air inlet 23 is fixed to the middle of the side of the cylinder body near the water inlet end 24 by means of a pair of threads. The air inlet 23 is connected to the air inlet pipe 235, the check valve 234, the air inlet pressure gauge 231, the air inlet valve 232, and the air inlet connecting component 233 from the inside to the outside. The air inlet pipe part is located inside the circular steel pipe, and the end can be extended into the pipe at the head of the drip irrigation system.

[0050] The exhaust port 22 is fixed at the middle position of the top end of the circular steel pipe by means of threading, and is connected to a pressure gauge 221 and an exhaust valve 222 in sequence from the inside to the outside.

[0051] The air inlet pipe 235 is located inside the cylinder and is a spiral tube with one end closed. The spiral diameter is 1 / 3 of the inner diameter of the cylinder.

[0052] The air intake pipe 235 is composed of two layers, the inner layer is a polyvinyl chloride layer 2351 with circular small holes with a diameter of 0.3 mm for air intake, and the outer layer is a polypropylene layer 2352 with a microporous structure.

[0053] The carbon dioxide water dissolving device is provided with a water inlet 24 and a water outlet 25 , and the water inlet 24 and the water outlet 25 of the carbon dioxide water dissolving device are respectively connected to the head 1 and the pipe network 3 of the drip irrigation system through flanges 212 .

[0054] The drip irrigation system includes a drip irrigation belt 31; an anti-reverse diffusion mechanism is provided on the flow channel of the drip irrigation belt, and the flow rate is 1.0 L / h.

[0055] Before transplanting, lay the ground film.

[0056] The salt discharge device 4 is a salt discharge seepage pipe 41, which is a plurality of seepage pipes 41 laid in parallel. The diameter of the seepage pipe 41 is 110 mm, the spacing is 25 meters, and the top of the seepage pipe 41 is 50 cm away from the ground surface.

[0057] Example 2

[0058] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 An industrial carbon dioxide system for improving saline-alkali land includes a liquid carbon dioxide storage device 8, a carbon dioxide water dissolving device 2, a control device, a drip irrigation system and a salt discharge device 4; the above-mentioned drip irrigation system includes a head 1 and a pipe network 3; the above-mentioned liquid carbon dioxide storage device 8 is connected to the carbon dioxide water dissolving device 2 through a pipeline and is connected to the pressure reducing valve 92 of the control device 91; the carbon dioxide water dissolving device 2 is connected to the drip irrigation system through a pipeline and is connected to the solenoid valve 93 of the control device 91; the salt discharge device 4 is arranged below the tillage layer and discharges the soil washing liquid.

[0059] The carbon dioxide dissolving device is a cylinder 21, a circular steel pipe 211 with flanges 212 connected to two open ends, an exhaust port 22 connected to the middle of the top of the circular steel pipe 211, and an air inlet 23 connected to the middle of the side of the circular steel pipe 211 near the water inlet end;

[0060] The air inlet 23 is fixed to the middle of the side of the cylinder body near the water inlet end 24 by means of a pair of threads. The air inlet 23 is connected to the air inlet pipe 235, the check valve 234, the air inlet pressure gauge 231, the air inlet valve 232, and the air inlet connecting component 233 from the inside to the outside. The air inlet pipe part is located inside the circular steel pipe, and the end can be extended into the pipe at the head of the drip irrigation system.

[0061] The exhaust port 22 is fixed at the middle position of the top end of the circular steel pipe by means of threading, and is connected to a pressure gauge 221 and an exhaust valve 222 in sequence from the inside to the outside.

[0062] The air inlet pipe 235 is located inside the cylinder and is a spiral tube with one end closed. The spiral diameter is 2 / 3 of the inner diameter of the cylinder.

[0063] The air intake pipe 235 is composed of two layers, the inner layer is a polyvinyl chloride layer 2351 with circular small holes with a diameter of 0.5 mm for air intake, and the outer layer is a polypropylene layer 2352 with a microporous structure.

[0064] The carbon dioxide water dissolving device is provided with a water inlet 24 and a water outlet 25 , and the water inlet 24 and the water outlet 25 of the carbon dioxide water dissolving device are respectively connected to the head 1 and the pipe network 3 of the drip irrigation system through flanges 212 .

[0065] The drip irrigation system includes a drip irrigation belt 31; an anti-reverse diffusion mechanism is provided on the flow channel of the drip irrigation belt, and the flow rate is 2.8 L / h.

[0066] Before transplanting, lay the ground film.

[0067] The salt discharge device 4 is a salt discharge seepage pipe 41, which is a plurality of seepage pipes 41 laid in parallel. The diameter of the seepage pipe 41 is 300 mm, the spacing is 35 meters, and the top of the seepage pipe 41 is 100 cm away from the ground surface.

[0068] Example 3

[0069] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 An industrial carbon dioxide system for improving saline-alkali land includes a liquid carbon dioxide storage device 8, a carbon dioxide water dissolving device 2, a control device, a drip irrigation system and a salt discharge device 4; the above-mentioned drip irrigation system includes a head 1 and a pipe network 3; the above-mentioned liquid carbon dioxide storage device 8 is connected to the carbon dioxide water dissolving device 2 through a pipeline and is connected to the pressure reducing valve 92 of the control device 91; the carbon dioxide water dissolving device 2 is connected to the drip irrigation system through a pipeline and is connected to the solenoid valve 93 of the control device 91; the salt discharge device 4 is arranged below the tillage layer and discharges the soil washing liquid.

[0070] The carbon dioxide dissolving device is a cylinder 21, a circular steel pipe 211 with flanges 212 connected to two open ends, an exhaust port 22 connected to the middle of the top of the circular steel pipe 211, and an air inlet 23 connected to the middle of the side of the circular steel pipe 211 near the water inlet end;

[0071] The air inlet 23 is fixed to the middle of the side of the cylinder body near the water inlet end 24 by means of a pair of threads. The air inlet 23 is connected to the air inlet pipe 235, the check valve 234, the air inlet pressure gauge 231, the air inlet valve 232, and the air inlet connecting component 233 from the inside to the outside. The air inlet pipe part is located inside the circular steel pipe, and the end can be extended into the pipe at the head of the drip irrigation system.

[0072] The exhaust port 22 is fixed at the middle position of the top end of the circular steel pipe by means of threading, and is connected to a pressure gauge 221 and an exhaust valve 222 in sequence from the inside to the outside.

[0073] The air inlet pipe 235 is located inside the cylinder and is a spiral tube with one end closed. The spiral diameter is 1 / 2 of the inner diameter of the cylinder.

[0074] The air intake pipe 235 is composed of two layers, the inner layer is a polyvinyl chloride layer 2351 with circular small holes with a diameter of 0.4 mm for air intake, and the outer layer is a polypropylene layer 2352 with a microporous structure.

[0075] The carbon dioxide water dissolving device is provided with a water inlet 24 and a water outlet 25 , and the water inlet 24 and the water outlet 25 of the carbon dioxide water dissolving device are respectively connected to the head 1 and the pipe network 3 of the drip irrigation system through flanges 212 .

[0076] The drip irrigation system includes a drip irrigation belt 31; an anti-reverse diffusion mechanism is provided on the flow channel of the drip irrigation belt, and the flow rate is 1.9 L / h.

[0077] Before transplanting, lay the ground film.

[0078] The salt discharge device 4 is a salt discharge seepage pipe 41, which is a plurality of seepage pipes 41 laid in parallel. The diameter of the seepage pipe 41 is 205 mm, the spacing is 30 meters, and the top of the seepage pipe 41 is 75 cm away from the ground surface.

[0079] Example 4

[0080] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , which is different from Example 1: the salt discharge device 4 is a salt discharge ditch 42, the diameter of the salt discharge ditch 42 is 110 mm, the spacing is 25 meters, and the top of the salt discharge ditch 42 is 50 cm away from the ground surface.

[0081] Example 5

[0082] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , which is different from Example 2: the salt discharge device 4 is a salt discharge ditch 42, the diameter of the salt discharge ditch 42 is 300 mm, the spacing is 35 meters, and the top of the salt discharge ditch 42 is 100 cm away from the ground surface.

[0083] Example 6

[0084] in accordance with Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , which is different from Example 3: the salt discharge device 4 is a salt discharge ditch 42, the diameter of the salt discharge ditch 42 is 205 mm, the spacing is 30 meters, and the top of the salt discharge ditch 42 is 75 cm away from the ground surface.

[0085] Example 7

[0086] in accordance with Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7, which is different from Example 1: An industrial carbon dioxide improvement saline-alkali land system also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. After being treated by the above industrial waste gas treatment system, the industrial waste gas of coal chemical industry (calcium carbide furnace tail gas, whose main components are CO 80%, H 2 9%, N 2 9%, CO 2 1%), under the action of the catalyst, the CO therein reacts with water in the carbon monoxide conversion device 10 to generate CO 2 and H 2 , enters the decarbonization device 11 for treatment, then enters the regeneration device 12, the obtained mixed gas enters the desulfurization device 13 for desulfurization, and finally enters the cooling and liquefaction device 14. The obtained liquid carbon dioxide concentration is 99.5%, which is stored in the carbon dioxide storage device 8. The carbon dioxide storage device 8 is connected to the pressure reducing valve 92 of the control device 91 of the air inlet end 23 of the carbon dioxide water dissolving device 2.

[0087] Example 8

[0088] in accordance with Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , which is different from Example 2: An industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. The industrial waste gas of industrial enterprises such as steelmaking (a lime kiln gas containing 35% carbon dioxide, the rest 63% nitrogen, oxygen and carbon monoxide content of 1.9%, in addition, also contains trace amounts of H 2 S and COS), under the action of the catalyst, the CO therein reacts with water in the carbon monoxide conversion device 10 to generate CO 2 and H 2 , enters the decarbonization device 11 for treatment, then enters the regeneration device 12, the obtained mixed gas enters the desulfurization device 13 for desulfurization, and finally enters the cooling and liquefaction device 14. The obtained liquid carbon dioxide concentration is 99%, which is stored in the carbon dioxide storage device 8. The carbon dioxide storage device 8 is connected to the pressure reducing valve 92 of the control device 91 at the air inlet end 23 of the carbon dioxide dissolving device 2.

[0089] Example 9

[0090] in accordance with Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7, which is different from Example 3: An industrial carbon dioxide improvement saline-alkali land system also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. The industrial waste gas of a petrochemical enterprise (containing 20% ​​carbon dioxide, the rest 53% nitrogen, 25% oxygen and carbon monoxide, and H 2 S and COS2%), under the action of the catalyst, the CO therein reacts with water in the carbon monoxide conversion device 10 to generate CO 2 and H 2 , enters the decarbonization device 11 for treatment, then enters the regeneration device 12, the obtained mixed gas enters the desulfurization device 13 for desulfurization, and finally enters the cooling and liquefaction device 14. The concentration of the obtained liquid carbon dioxide is 98%, which is stored in the carbon dioxide storage device 8. The carbon dioxide storage device 8 is connected to the pressure reducing valve 92 of the terminal control device 91 of the air inlet end 23 of the carbon dioxide dissolving device 2.

[0091] Example 10

[0092] in accordance with Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , which is different from Example 4: an industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. The industrial waste gas of a soda ash production enterprise (another lime kiln gas contains 40% carbon dioxide, 59% nitrogen, and about 0.9% oxygen and carbon monoxide) is reacted with water in the carbon monoxide conversion device 10 under the action of a catalyst to generate CO 2 and H 2 , enters the decarbonization device 11 for treatment, then enters the regeneration device 12, the obtained mixed gas enters the desulfurization device 13 for desulfurization, and finally enters the cooling and liquefaction device 14. The concentration of the obtained liquid carbon dioxide is 97%, which is stored in the carbon dioxide storage device 8. The carbon dioxide storage device 8 is connected to the pressure reducing valve 92 of the terminal control device 91 of the air inlet end 23 of the carbon dioxide dissolving device 2.

[0093] Embodiment 11

[0094] Based on Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7, which is different from Example 5: An industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. The liquid carbon dioxide obtained after being treated by the above-mentioned industrial waste gas treatment system is stored in a carbon dioxide storage device, and the carbon dioxide concentration is 96%.

[0095] Example 12

[0096] Based on Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , which is different from Example 6: An industrial carbon dioxide system for improving saline-alkali land also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device 10, a decarbonization device 11, a regeneration device 12, a desulfurization device 13, and a cooling and liquefaction device 14. The liquid carbon dioxide obtained after being treated by the above-mentioned industrial waste gas treatment system is stored in a carbon dioxide storage device, and the carbon dioxide concentration is 95%.

[0097] The following is an example of a method for improving saline-alkali land system and promoting the production of eggplant pod vegetables using industrial carbon dioxide

[0098] Embodiment 13

[0099] The method for improving the saline-alkali land system and increasing the yield of eggplant pod vegetables by using the industrial carbon dioxide in the above embodiment 1 includes the following method:

[0100] 1) Determine the pH value of soil and water sources to determine whether it is saline-alkali land, and design and determine the system and plan for improving saline-alkali land with industrial carbon dioxide;

[0101] 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system;

[0102] 3) Seedling raising and transplanting: Select eggplant pod vegetable varieties that are early-maturing, disease-resistant, cold-resistant, fruit-intensive, high-yielding, and resistant to transportation. Start raising seedlings in the greenhouse in early March. When the ground temperature 5 cm below the film is stable at above 15°C, transplanting can be carried out. Use a drip irrigation seeder under the film to lay the drip irrigation tape and film. The film width is 115 cm. The mode of one film, two tubes, and two rows is adopted. The drip irrigation tape is laid on the edge of the planting row. The row spacing is 80 cm + 60 cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after transplanting. Keep the soil moist in the early stage without water accumulation. The water volume is 300m 3 / hm 2 When the second bunch of fruits grows to the size of walnuts, the first irrigation and topdressing are carried out in combination with watering. After that, water is generally irrigated once every 7 days. Combined with irrigation, topdressing is carried out once when the fourth and sixth bunches of fruits swell. 2Topdress with 5kg of diammonium phosphate and 3kg of potassium sulfate;

[0103] 4) preparing an acidic aqueous solution: measuring the soil pH value after irrigation in 3), using a conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution, combining the growth habits of eggplant vegetables, soil environmental requirements and water demand patterns, referring to the water source pH value measured in 1), using a pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolving the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide water dissolving device after reducing the pressure by a control device according to the amount, to form an acidic aqueous solution with the above pH value;

[0104] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution into the drip irrigation system through the control device for application. Starting from the first irrigation and topdressing, drip application of carbon dioxide aqueous solution can be performed during each irrigation. The amount of carbon dioxide applied each time is 5kg / 667m 2 ;

[0105] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0106] Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: determine the pH value of the acidic aqueous solution when the acidic aqueous solution is applied this time based on the soil pH value measured before the acidic aqueous solution is applied, and determine the amount of carbon dioxide added when the acidic aqueous solution is applied this time based on the pH value of the acidic aqueous solution applied this time.

[0107] Among them, the key points are as follows:

[0108] 4) In the preparation of the acidic aqueous solution, when the industrial carbon dioxide in the carbon dioxide storage device is decompressed by the control device and dissolved in the water of the carbon dioxide water dissolving device, the solenoid valve at the water inlet end is started through the DCS control cabinet, and the internal pressure of the carbon dioxide water dissolving device is controlled at 0.05MPa. The pressure reducing valve at the air inlet end of the carbon dioxide water dissolving device is adjusted, and the air inlet pressure of the carbon dioxide water dissolving device is not lower than the internal pressure of the carbon dioxide water dissolving device, which is controlled at 0.055MPa.

[0109] 5) dripping the acidic aqueous solution, when the acidic aqueous solution prepared in 4) is added into the drip irrigation system through the control device for application, the solenoid valve at the water outlet is started through the DCS control cabinet to control the ground pipe network pressure of the drip irrigation system to 0.05MPa.

[0110] Embodiment 14

[0111] The method for improving the saline-alkali land system and increasing the yield of eggplant pod vegetables by using the industrial carbon dioxide in the above-mentioned embodiment 2 includes the following method:

[0112] 1) Determine the pH value of soil and water sources to determine whether it is saline-alkali land, and design and determine the system and plan for improving saline-alkali land with industrial carbon dioxide;

[0113] 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system;

[0114] 3) Seedling raising and transplanting: Select eggplant pod vegetable varieties that are early-maturing, disease-resistant, cold-resistant, fruit-intensive, high-yielding, and resistant to transportation. Start raising seedlings in the greenhouse in early March. When the ground temperature 5 cm below the film is stable at above 15°C, transplanting can be carried out. Use a drip irrigation seeder under the film to lay the drip irrigation tape and film. The film width is 115 cm. A mode of one film, two tubes, and two rows is adopted. The drip irrigation tape is laid on the edge of the planting row. The row spacing is 80 cm + 60 cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after transplanting. Keep the soil moist in the early stage without water accumulation. The water volume is 450m 3 / hm 2 When the second bunch of fruits grows to the size of walnuts, the first irrigation and topdressing are carried out in combination with watering. After that, water is generally irrigated once every 9 days. Combined with irrigation, topdressing is carried out once when the fourth and sixth bunches of fruits swell. 2 Topdress 8kg of triple compound water-soluble fertilizer;

[0115] 4) preparing an acidic aqueous solution: measuring the soil pH value after irrigation in 3), using a conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution, combining the growth habits of eggplant vegetables, soil environmental requirements and water demand patterns, referring to the water source pH value measured in 1), using a pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolving the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide water dissolving device after reducing the pressure by a control device according to the amount, to form an acidic aqueous solution with the above pH value;

[0116] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution into the drip irrigation system through the control device for application. Starting from the first irrigation and topdressing, drip application of carbon dioxide aqueous solution can be performed during each irrigation. The amount of carbon dioxide applied each time is 3kg / 667m 2 ;

[0117] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0118] Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: determine the pH value of the acidic aqueous solution when the acidic aqueous solution is applied this time based on the soil pH value measured before the acidic aqueous solution is applied, and determine the amount of carbon dioxide added when the acidic aqueous solution is applied this time based on the pH value of the acidic aqueous solution applied this time.

[0119] Among them, the key points are as follows:

[0120] 4) In the preparation of the acidic aqueous solution, when the industrial carbon dioxide in the carbon dioxide storage device is decompressed by the control device and dissolved in the water of the carbon dioxide water dissolving device, the solenoid valve at the water inlet end is started through the DCS control cabinet, and the internal pressure of the carbon dioxide water dissolving device is controlled at 0.40MPa. The pressure reducing valve at the air inlet end of the carbon dioxide water dissolving device is adjusted, and the air inlet pressure of the carbon dioxide water dissolving device is not lower than the internal pressure of the carbon dioxide water dissolving device, which is controlled at 0.405MPa.

[0121] 5) dripping the acidic aqueous solution, when the acidic aqueous solution prepared in 4) is added into the drip irrigation system through the control device for application, the solenoid valve at the water outlet is started through the DCS control cabinet to control the ground pipe network pressure of the drip irrigation system to 0.15MPa.

[0122] Embodiment 15

[0123] The method for improving the saline-alkali land system and increasing the yield of eggplant pod vegetables by using the industrial carbon dioxide in the above-mentioned embodiment 3 includes the following method:

[0124] 1) Determine the pH value of soil and water sources to determine whether it is saline-alkali land, and design and determine the system and plan for improving saline-alkali land with industrial carbon dioxide;

[0125] 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system;

[0126] 3) Seedling raising and transplanting: Select eggplant pod vegetable varieties that are early-maturing, disease-resistant, cold-resistant, fruit-intensive, high-yielding, and resistant to transportation. Start raising seedlings in the greenhouse in early March. When the ground temperature 5 cm below the film is stable at above 15°C, transplanting can be carried out. Use a drip irrigation seeder under the film to lay the drip irrigation tape and film. The film width is 115 cm. A mode of one film, two tubes, and two rows is adopted. The drip irrigation tape is laid on the edge of the planting row. The row spacing is 80 cm + 60 cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after transplanting. Keep the soil moist in the early stage without water accumulation. The water volume is 450m 3 / hm 2 When the second bunch of fruits grows to the size of walnuts, the first irrigation and topdressing are carried out in combination with watering. After that, water is generally irrigated once every 8 days. Combined with irrigation, topdressing is carried out once when the fourth and sixth bunches of fruits swell. 2 Follow up with 5kg of diammonium phosphate and 3kg of potassium sulfate;

[0127] 4) preparing an acidic aqueous solution: measuring the soil pH value after irrigation in 3), using a conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution, combining the growth habits of eggplant vegetables, soil environmental requirements and water demand patterns, referring to the water source pH value measured in 1), using a pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolving the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide water dissolving device after reducing the pressure by a control device according to the amount, to form an acidic aqueous solution with the above pH value;

[0128] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution into the drip irrigation system through the control device for application. Starting from the first irrigation and topdressing, drip application of carbon dioxide aqueous solution can be performed during each irrigation. The amount of carbon dioxide applied each time is 4kg / 667m 2 ;

[0129] 6) The salt discharge device discharges the soil elution generated in 5) above;

[0130] Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: determine the pH value of the acidic aqueous solution when the acidic aqueous solution is applied this time based on the soil pH value measured before the acidic aqueous solution is applied, and determine the amount of carbon dioxide added when the acidic aqueous solution is applied this time based on the pH value of the acidic aqueous solution applied this time.

[0131] Among them, the key points are as follows:

[0132] 4) In the preparation of the acidic aqueous solution, when the industrial carbon dioxide in the carbon dioxide storage device is decompressed by the control device and dissolved in the water of the carbon dioxide water dissolving device, the solenoid valve at the water inlet end is started through the DCS control cabinet, and the internal pressure of the carbon dioxide water dissolving device is controlled at 0.225MPa. The pressure reducing valve at the air inlet end of the carbon dioxide water dissolving device is adjusted, and the air inlet pressure of the carbon dioxide water dissolving device is not lower than the internal pressure of the carbon dioxide water dissolving device, which is controlled at 0.230MPa.

[0133] 5) dripping the acidic aqueous solution, when the acidic aqueous solution prepared in 4) is added into the drip irrigation system through the control device for application, the solenoid valve at the water outlet is started through the DCS control cabinet to control the ground pipe network pressure of the drip irrigation system to 0.10MPa.

[0134] Example 16

[0135] In the process of cultivating eggplant pod vegetables in the experimental field of Tianye Chemical Park in 2022, a method of improving saline-alkali land system with industrial carbon dioxide to increase crop income was used to cultivate eggplant pod vegetables, including the following methods:

[0136] 1) The pH values ​​of soil and water were measured to be 9.1 and 7.9 respectively, to determine whether it was saline-alkali land, and to design and determine the industrial carbon dioxide improvement system and plan for saline-alkali land;

[0137] 2) Preparation for farming: The equipment in Example 7 is installed in place. Since the Tianye Chemical Park test site is located in the chemical park and is close to the industrial waste gas treatment system of the calcium carbide furnace tail gas, the liquid carbon dioxide (with a purity of 99.9%) obtained through the carbon monoxide conversion device, decarbonization device, regeneration device, desulfurization device, and cooling liquefaction device is directly transported through a pipeline to the carbon dioxide water dissolving device located at the head of the drip irrigation system of the Tianye Chemical Park test site, and is connected to the pressure reducing valve of the control device;

[0138] 3) Seedling raising and transplanting: Select eggplant pod vegetable varieties that are early-maturing, disease-resistant, cold-resistant, fruit-intensive, high-yielding, and resistant to transportation. Start raising seedlings in the greenhouse in early March. When the ground temperature 5 cm below the film is stable at above 15°C, transplanting can be carried out. Use a drip irrigation seeder under the film to lay the drip irrigation tape and film. The film width is 115 cm. A mode of one film, two tubes, and two rows is adopted. The drip irrigation tape is laid on the edge of the planting row. The row spacing is 80 cm + 60 cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after transplanting. Keep the soil moist in the early stage without water accumulation. The water volume is 450m 3 / hm 2 When the second bunch of fruits grows to the size of walnuts, the first irrigation and topdressing are carried out in combination with watering. After that, water is generally irrigated once every 8 days. Combined with irrigation, topdressing is carried out once when the fourth and sixth bunches of fruits swell. 2 Topdress 8kg of triple compound water-soluble fertilizer;

[0139] 4) Prepare an acidic aqueous solution: determine the soil pH value after irrigation in 3), and use the conventional neutralization reaction calculation formula to determine that the pH value of the acidic aqueous solution is 5.7. Combined with the growth habits, soil environmental requirements and water demand of eggplant vegetables, and with reference to the water source pH value determined in 1), use the pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolve the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide dissolving device after reducing the pressure by the control device to form an acidic aqueous solution with the above pH value. Start the water inlet end solenoid valve through the DCS control cabinet, and control the internal pressure of the carbon dioxide dissolving device at 0.100MPa. Adjust the air inlet end pressure reducing valve of the carbon dioxide dissolving device, and the air inlet pressure of the carbon dioxide dissolving device is not lower than the internal pressure of the carbon dioxide dissolving device, which is controlled at 0.105MPa.

[0140] 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution to the drip irrigation system through the control device for application, start the water outlet solenoid valve through the DCS control cabinet, the pressure of the drip irrigation system is 0.08MPa, and apply the acidic aqueous solution from the ear stage. Before each application of the acidic aqueous solution, measure the soil pH value, and then perform the above 4) and 5) in sequence: According to the soil pH value measured before the application of the acidic aqueous solution, determine the pH value of the acidic aqueous solution when applying the acidic aqueous solution this time, and determine the amount of carbon dioxide added when applying the acidic aqueous solution this time according to the pH value of the acidic aqueous solution this time. Starting from the first irrigation and topdressing, carbon dioxide aqueous solution can be dripped during each irrigation, and the amount of carbon dioxide used each time is 4kg / 667m 2 ;

[0141] 6) After being treated by the above method, the salt water in the soil is discharged through the salt drainage seepage pipe.

[0142] The actual yield of the planting area using the present invention and the planting area using the conventional method (kg / 666.67m 2 ) The data are as follows:

[0143]

[0144] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. Industrial carbon dioxide improves saline-alkali land system, characterized by: It includes a liquid carbon dioxide storage device, a carbon dioxide water dissolving device, a control device, a drip irrigation system and a salt discharge device; the above-mentioned drip irrigation system includes a head and a pipe network; the above-mentioned liquid carbon dioxide storage device is connected to the carbon dioxide water dissolving device through a pipe and is connected to the control device; the carbon dioxide water dissolving device is connected to the drip irrigation system through a pipe and is connected to the control device; the salt discharge device is arranged below the tillage layer and discharges the soil washing liquid.

2. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: The carbon dioxide dissolving device comprises: The cylinder body has two open ends connected to a circular steel pipe with flanges, the middle position of the top of the circular steel pipe is connected to the exhaust port, and the middle position of the side of the circular steel pipe near the water inlet is connected to the air inlet; The air inlet is fixed in the middle of the side of the cylinder near the water inlet end by threading. The air inlet is connected to the air inlet pipe, check valve, air inlet pressure gauge, air inlet valve, and air inlet connection parts from the inside to the outside. The air inlet pipe is located inside the circular steel pipe, and the end can be extended into the pipe at the head of the drip irrigation system. Exhaust port: The exhaust port is fixed at the middle position of the top end of the circular steel pipe by means of thread connection, and is connected to the pressure gauge and the exhaust valve from the inside to the outside in sequence.

3. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: The air inlet pipe is located inside the cylinder and is a spiral-shaped circular pipe with one end closed. The spiral diameter is 1 / 3 to 2 / 3 of the inner diameter of the cylinder.

4. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: The air intake pipe is composed of two layers, the inner layer is a polyvinyl chloride layer with circular small holes with a diameter of 0.3-0.5 mm for air intake, and the outer layer is a polypropylene layer with a microporous structure.

5. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: The drip irrigation system comprises a drip irrigation belt; the flow rate of the drip irrigation belt is 1.0-2.8 L / h, and an anti-reverse diffusion mechanism is arranged on the flow channel.

6. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: The salt discharge device is a salt discharge seepage pipe, which is a plurality of seepage pipes laid in parallel, with a diameter of 110-300 mm, a spacing of 25-35 meters, and a top of the seepage pipe 50-100 cm away from the ground surface.

7. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: The salt discharge device is a salt discharge culvert, which is a plurality of parallel culverts, with a culvert width of 110-300 mm, a spacing of 25-35 meters, and a top of the culvert 50-100 cm from the ground surface.

8. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: It also includes an industrial waste gas treatment system, which includes a carbon monoxide conversion device, a decarbonization device, a regeneration device, a desulfurization device, and a cooling and liquefaction device. The liquid carbon dioxide obtained after being treated by the above-mentioned industrial waste gas treatment system is stored in a carbon dioxide storage device, and the carbon dioxide concentration is not less than 95%.

9. The industrial carbon dioxide improving saline-alkali land system according to claim 1, characterized in that: Also includes the mulch that is laid.

10. A method for increasing the yield of eggplant pod vegetables by using the system for improving saline-alkali land using industrial carbon dioxide according to any one of claims 1 to 9, characterized in that The steps include: 1) Determine the pH value of soil and water sources to determine whether it is saline-alkali land, and design and determine the system and plan for improving saline-alkali land with industrial carbon dioxide; 2) Farming preparation: Install industrial carbon dioxide to improve saline-alkali land system; 3) Seedling raising and transplanting: Select eggplant pod vegetable varieties that are early-maturing, disease-resistant, cold-resistant, fruit-intensive, high-yielding, and resistant to transportation. Start raising seedlings in the greenhouse in early March. When the ground temperature 5 cm below the film is stable at above 20°C, transplanting can be carried out. Use a drip irrigation seeder under the film to lay the drip irrigation tape and film. The film width is 115 cm. A mode of one film, two tubes, and two rows is adopted. The drip irrigation tape is laid on the edge of the planting row. The row spacing is 80 cm + 60 cm. The plant spacing is set according to the density requirements of the variety. Irrigation is carried out immediately after transplanting. Keep the soil moist in the early stage without water accumulation. The water volume is 450m 3 / hm 2 When the second bunch of fruits grows to the size of walnuts, the first irrigation and topdressing are carried out in combination with irrigation. After that, water is generally irrigated once every 7-9 days. Combined with irrigation, topdressing is carried out once when the fourth and sixth bunches of fruits swell, respectively. Each time, every 667m 2 Topdress with 5kg of diammonium phosphate, 3kg of potassium sulfate or 8kg of ternary compound water-soluble fertilizer; 4) preparing an acidic aqueous solution: measuring the soil pH value after irrigation in 3), using a conventional neutralization reaction calculation formula to determine the pH value of the acidic aqueous solution, combining the growth habits of eggplant vegetables, soil environmental requirements and water demand patterns, referring to the water source pH value measured in 1), using a pH adjustment calculation formula to determine the amount of carbon dioxide to be added, and dissolving the industrial carbon dioxide in the carbon dioxide storage device in the water of the carbon dioxide water dissolving device after reducing the pressure by a control device according to the amount, to form an acidic aqueous solution with the above pH value; 5) Drip application of acidic aqueous solution: Add the prepared acidic aqueous solution into the drip irrigation system through the control device for application. Starting from the first irrigation and topdressing, drip application of carbon dioxide aqueous solution can be performed during each irrigation. The amount of carbon dioxide applied each time is 3-5kg / 667m 2 ; 6) The salt discharge device discharges the soil elution generated in 5) above; Before applying the acidic aqueous solution each time, measure the soil pH value, and then carry out the above 4) and 5) in sequence: determine the pH value of the acidic aqueous solution when the acidic aqueous solution is applied this time based on the soil pH value measured before the acidic aqueous solution is applied, and determine the amount of carbon dioxide added when the acidic aqueous solution is applied this time based on the pH value of the acidic aqueous solution applied this time.

11. The method for improving saline-alkali land system by using industrial carbon dioxide to increase the yield of eggplant and pod vegetables according to claim 10, characterized in that: In the step 2, when the industrial carbon dioxide in the carbon dioxide storage device is dissolved in the water of the carbon dioxide water dissolving device after being decompressed by the control device, the solenoid valve at the water inlet end is started by the DCS control cabinet, and the internal pressure of the carbon dioxide water dissolving device is controlled at 0.05-0.40MPa. The pressure reducing valve at the air inlet end of the carbon dioxide water dissolving device is adjusted, and the air inlet pressure of the carbon dioxide water dissolving device is not lower than the internal pressure of the carbon dioxide water dissolving device, which is controlled at 0.055-0.405MPa.

12. The method for improving saline-alkali land system by using industrial carbon dioxide to increase the yield of eggplant and pod vegetables according to claim 10, characterized in that: In the step three, when the acidic aqueous solution prepared in step two is added to the drip irrigation system through the control device for application, the outlet solenoid valve is started through the DCS control cabinet to control the aboveground pipe network pressure of the drip irrigation system to 0.05-0.15MPa.

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