Soil flame sterilization method and device

Abstract

The invention discloses a soil flame sterilization method and device. The sterilization method comprises the steps that the rotary tillage speed and the rotary tillage depth of rotary tillage operation and the temperature and the humidity of operation soil are obtained in real time; performing a layered disinfection strategy on the operation soil based on the rotary tillage depth, and dynamically adjusting combustion parameters of sterilization flame based on the collected temperature, humidity and rotary tillage speed of the operation soil; wherein the layered disinfection strategy is that the combustion mode of sterilization flame is dynamically adjusted according to the rotary tillage depth. According to the method, the rotary tillage speed and the rotary tillage depth are collected in real time, sterilization layers are dynamically divided in combination with the rotary tillage depth, a layered disinfection strategy is carried out on operation soil, the temperature and humidity parameters of the soil are collected in real time, and the combustion temperature, duration and frequency are adjusted in real time through a closed-loop control algorithm; according to pathogen distribution characteristics and soil structure differences of soil at different depths, precise and efficient sterilization and deinsectization are achieved, and meanwhile energy waste and ecological damage are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of soil sterilization, and specifically to a soil flame sterilization method and device. Background Art

[0002] Some domestic and foreign enterprises have been researching and developing soil high-temperature equipment, but most of the mainstream high-temperature sterilization equipment focuses on the treatment of the soil surface layer. For example, high-temperature steam equipment can only penetrate to a shallow layer (0 - 5 cm), while traditional flame sterilization equipment can quickly kill surface pathogens and weed seeds, but the high-temperature action range is limited to the soil surface (0 - 10 cm). For stubborn pathogens (such as root-knot nematodes, soil-borne fungi, etc.) in deep soil (10 - 30 cm), the existing technology lacks effective heat penetration ability, resulting in incomplete sterilization and repeated occurrence of diseases. Summary of the Invention

[0003] According to one aspect of the present application, a soil flame sterilization method is provided, which realizes precise and efficient sterilization and pest control based on layered disinfection and dynamic regulation of combustion parameters. The sterilization method includes:

[0004] Obtain in real time the rotary tillage speed, rotary tillage depth, and the temperature and humidity of the working soil during rotary tillage operations;

[0005] Implement a layered disinfection strategy for the working soil based on the rotary tillage depth, and dynamically adjust the combustion parameters of the sterilization flame based on the collected temperature, humidity, and rotary tillage speed of the working soil;

[0006] Wherein the layered disinfection strategy is to dynamically adjust the combustion mode of the sterilization flame according to the rotary tillage depth.

[0007] Preferably, the combustion mode of the sterilization flame includes:

[0008] For the surface working soil, use a high-frequency short-pulse flame for rapid combustion sterilization, with a combustion temperature of 500°C - 550°C;

[0009] For the deep working soil, use a low-frequency long-pulse flame for penetrative sterilization, with a combustion temperature of 400°C - 450°C.

[0010] Preferably, the combustion parameters include: combustion duration t, combustion temperature T, spraying frequency f, and unit combustion volume V.

[0011] Preferably, the combustion temperature T is determined based on the temperature of the soil and the rotational speed of the blade, and the calculation formula is:

[0012]

[0013] In the formula: K p is the proportionality coefficient, K i is the integral coefficient, Kd is the differential coefficient, T 目标 is the target temperature of the burning soil, T 实际 is the actually collected soil temperature.

[0014] Preferably, the combustion temperature is controlled by the flow rate Q of the combustion medium, and its calculation formula is:

[0015] Q = k·n·ρ

[0016] In the formula: n is the rotational speed, with the unit of r / min; ρ is the soil density, with the unit of kg / m 3 ; k is the correction coefficient.

[0017] Preferably, the combustion duration t is determined based on the humidity of the soil, the rotary tillage depth, and the forward speed, and its expression is:

[0018] t = 0.2D / v + Δt 湿度

[0019] In the formula, D is the target disinfection depth, with the unit of m; v is the forward speed, with the unit of m / s; Δt 湿度 is the soil humidity compensation. Preferably, the flame spraying frequency f satisfies the calculation formula:

[0020] f = N·v / 60

[0021] In the formula, N is the blade rotational speed, with the unit of rpm; v is the forward speed, with the unit of m / s;

[0022] Preferably, the calculation formula for the unit combustion volume V is:

[0023] V = π·r 2 ·d·η

[0024] In the formula, r: the flame diffusion radius, with the unit of m; d: the soil turning depth, with the unit of m; η: the thermal efficiency coefficient.

[0025] According to another aspect of the present application, there is provided a soil flame sterilization device for the above-mentioned soil flame sterilization method. By real-time collecting the rotary tillage speed, rotary tillage depth, and soil temperature and humidity parameters, dynamically dividing the sterilization levels, and adjusting the burning parameters to achieve the purpose of efficient sterilization. The sterilization device includes:

[0026] A rotary tillage body, with a plurality of rotary tillage blades arranged at intervals along the extending direction, and the rotary tillage blades are installed on the rotary tillage body;

[0027] A flame treatment unit, including a nozzle and a burner, the nozzle is installed on the rotary tillage body, behind the rotary tillage blade, and the nozzle is connected to the burner;

[0028] The acquisition unit is used to acquire the rotary tillage speed, rotary tillage depth of the rotary tillage body, as well as the temperature and humidity of the working soil.

[0029] The control unit is respectively connected to the controller of the rotary tillage body and the burner. The control unit determines the combustion mode and dynamically adjusts the combustion parameters of the sterilization flame of the burner based on the working state of the rotary tillage body and the acquisition data of the acquisition unit.

[0030] Preferably, the acquisition unit includes a speed collector and a depth collector installed on the rotary tillage body, a temperature collector and a humidity collector installed on the blade.

[0031] The control unit determines the combustion mode according to the acquisition data of the depth collector.

[0032] The control unit determines its combustion temperature T according to the acquisition data of the temperature collector and the rotation speed of the blade.

[0033] The control unit determines its combustion duration t according to the data of the humidity collector, depth collector and speed collector.

[0034] The control unit determines the spraying frequency f of the flame according to the rotation speed of the blade and the data of the speed collector.

[0035] The control unit determines the unit combustion volume V according to the depth collector.

[0036] Compared with the prior art, the beneficial effects of this application are as follows:

[0037] This application implements a stratified disinfection strategy for the working soil by real-time collecting the rotary tillage speed and depth, and dynamically dividing the sterilization levels (high-frequency short-pulse high-temperature sterilization on the surface layer and low-frequency long-pulse permeation sterilization on the deep layer) in combination with the rotary tillage depth. By real-time collecting the parameters of the soil temperature and humidity, the combustion temperature, duration and frequency are adjusted in real time using a closed-loop control algorithm to achieve precise and efficient sterilization and pest control for the pathogen distribution characteristics and soil structure differences of different depths of soil, while reducing energy waste and ecological damage.

[0038] Differentially process the pathogen distribution characteristics at different depths, taking into account rapid inactivation on the surface layer and deep heat penetration to achieve precise sterilization:

[0039] By dynamically adjusting the combustion parameters to match the actual working conditions and soil texture structure, avoid ineffective heating and reduce fuel consumption; reduce the killing of beneficial microorganisms through a differential temperature control strategy and maintain the balance of the soil microecosystem.

[0040] By implementing a layered disinfection strategy for the working soil and dynamically regulating the combustion parameters, this application effectively solves the problems of resource waste, uneven effects, and ecological side effects caused by the "one-size-fits-all" sterilization in the prior art, providing reliable technical support for green agriculture. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic structural diagram of a soil flame sterilization device in an embodiment of this application;

[0042] In the figure: 1, rotary tillage machine body; 2, rotary tillage blades; 3, nozzle; 4, speed collector; 5, depth collector; 6, temperature and humidity sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] According to one aspect of this application, a soil flame sterilization method is provided, and the sterilization method includes:

[0044] Obtain the rotary tillage speed, rotary tillage depth, temperature, and humidity of the working soil in real time;

[0045] Implement a layered disinfection strategy for the working soil based on the rotary tillage depth, and dynamically adjust the combustion parameters of the sterilization flame based on the temperature, humidity, and rotary tillage speed of the collected working soil;

[0046] The layered disinfection strategy is to dynamically adjust the combustion mode of the sterilization flame according to the rotary tillage depth.

[0047] It should be noted that:

[0048] In this application, the surface soil (0 - 10 cm) is the main aggregation layer of most pathogens, eggs, and weed seeds, and rapid high-temperature treatment is required to inactivate the surface biological contamination. In the deep soil (10 - 20 cm), there may be stubborn pathogens (such as root-knot nematodes and soil-borne fungi), and continuous heat penetration is required to completely kill them, while avoiding overheating and damaging the soil aggregate structure; and beneficial microorganisms are mostly enriched in the surface organic matter layer (0 - 5 cm), while the deep layer (10 - 20 cm) is mainly pathogens.

[0049] Therefore, this application dynamically adjusts the combustion mode of the sterilization flame according to the rotary tillage depth to achieve sterilization while avoiding killing the beneficial microorganisms in the soil.

[0050] Furthermore, the combustion mode of the sterilization flame includes:

[0051] For the surface working soil, high-frequency short-pulse flame rapid combustion sterilization is adopted, and the combustion temperature is 500°C - 550°C;

[0052] For the deep working soil, low-frequency long-pulse flame penetration sterilization is adopted, and the combustion temperature is 400°C - 450°C.

[0053] Furthermore, the combustion parameters include: combustion duration t, combustion temperature T, flame spraying frequency f, and unit combustion volume V.

[0054] Furthermore, the combustion temperature T is determined based on the temperature of the soil and the rotational speed of the blade, and the calculation formula is:

[0055]

[0056] In the formula: K p is the proportionality coefficient, K i is the integral coefficient, K d is the differential coefficient, T 目标 is the target temperature of the burning soil, in °C; T 实际 is the actually collected soil temperature, in °C.

[0057] It should be noted that:

[0058] In an embodiment of the present application, K p = 0.8, K i = 0.2, K d = 0.1.

[0059] Furthermore, the combustion temperature is controlled by the flow rate Q of the combustion medium, and its calculation formula is:

[0060] Q = k·n·ρ

[0061] In the formula: n is the rotational speed, in r / min; ρ is the soil density, in kg / m 3 ; k is the correction coefficient.

[0062] It should be noted that:

[0063] In an embodiment of the present application, the combustion medium is gas. According to the flow rate Q = k·n·ρ of the combustion medium, it is respectively obtained that:

[0064] When burning the surface operation soil, if the combustion temperature is controlled within 500°C to 550°C, then the correction coefficient k is determined to be 0.6. When performing surface combustion, the flow rate Q of the gas during surface combustion 表层 The calculation formula is:

[0065] Q 表层 = 0.6·V·ρ soil

[0066] In the formula, ρ soil is the soil density, in kg / m 3 ; V is the rotary tillage volume, in m 3 .

[0067] When burning the deep working soil, if the combustion temperature is controlled within 400°C to 450°C, the correction coefficient k is determined to be 0.4. When performing deep-layer combustion, the gas flow rate Q during deep-layer combustion 深层 The calculation formula is:

[0068]

[0069] In the formula, ρ soil is the soil density, with the unit kg / m 3 ; V is the rotary tillage volume, with the unit m 3 ; D is the target disinfection depth, with the unit cm.

[0070] Furthermore, the combustion duration t is determined according to the humidity of the soil, the rotary tillage depth, and the forward speed, and its expression is:

[0071] t = 0.2D / v + Δt 湿度

[0072] In the formula, D is the target disinfection depth, with the unit m; v is the forward speed, with the unit m / s; Δt 湿度 is the soil humidity compensation.

[0073] It should be noted that:

[0074] In an embodiment of the present application, when the humidity increases by 10%, the spraying time is extended by 5%;

[0075] The flame spraying frequency f satisfies the calculation formula:

[0076] f = N·v / 60

[0077] In the formula, N is the blade rotation speed, with the unit rpm; v is the forward speed, with the unit m / s;

[0078] Furthermore, the calculation formula for the unit combustion volume V is:

[0079] V = π·r 2 ·d·η

[0080] In the formula, r: the flame diffusion radius, with the unit m; d: the soil turning depth, with the unit m; η: the thermal efficiency coefficient.

[0081] As shown in the appendix Figure 1 A soil flame sterilization device, the sterilization device is used for the above-mentioned soil flame sterilization method, and the sterilization device includes:

[0082] A rotary tillage machine body 1, with a number of rotary tillage blades arranged at intervals along the extension direction, and the rotary tillage blades are installed on the rotary tillage machine body;

[0083] A flame treatment unit, including a nozzle 3 and a burner, wherein the nozzle 3 is installed on the rotary tillage machine body 1, behind the rotary tillage blades 2, and the nozzle 3 is connected to the burner through a fireproof pipe;

[0084] A collection unit, configured to collect the rotary tillage speed, rotary tillage depth of the rotary tillage machine body 1, as well as the temperature and humidity of the working soil;

[0085] A control unit, respectively connected to the controller of the rotary tillage machine body 1 and the burner, and the control unit determines the combustion mode and dynamically adjusts the combustion parameters of the sterilization flame of the burner based on the working state of the rotary tillage machine body and the collected data of the collection unit.

[0086] It should be noted that:

[0087] In this application, the rotary tillage machine body: is responsible for deep loosening and tilling of the soil, improving the air permeability and structure of the soil. The rotary tillage machine body is a conventional rotary tiller in this industry and is driven by a drive motor.

[0088] The flame treatment unit: realizes the direct action of the high-temperature flame generated by the burner on the soil through the spraying head, eliminates harmful organisms such as pathogenic bacteria and insect eggs, and provides a high-temperature disinfection effect.

[0089] The collection unit, which monitors in real time the environmental parameters of the working soil and the working state of the rotary tillage machine body;

[0090] The control unit: adjusts in real time the various parameters during the operation process to ensure the efficient operation of the equipment.

[0091] Among them, in order to realize that the nozzle is a retractable nozzle to adapt to different operation depths;

[0092] The control unit adjusts its flame temperature in real time based on the combustion medium, so that the temperature of the soil surface layer is 50°C - 60°C, ensuring the best soil disinfection, weeding and element activation effects, and preventing damage to the soil structure caused by excessive temperature.

[0093] In order to ensure the thorough disinfection of the soil, the sterilization flame must be able to cover the entire rotary tillage area, and the temperature distribution of the flame should be as uniform as possible. The coverage range and uniformity of the flame directly affect the disinfection effect and efficiency.

[0094] In order to ensure that during the rotary tillage operation, the flame can evenly cover the entire rotary tillage area and avoid the problem of incomplete treatment in some areas, this application adopts a reasonable configuration of multiple burners. Based on the fact that each burner can effectively cover a rotary tillage area about 20 cm wide, according to the overall width of the rotary tillage area of the operation, the number of configured burners is determined to make the width of the flame coverage area consistent with the width of the operation path.

[0095] Flame penetration depth: The temperature and action depth of the flame should be able to penetrate deep into the soil, and the disinfection depth is 0 - 30 cm. The nozzle design of the burner needs to generate an appropriate flame injection distance and angle to ensure that the flame can penetrate deep into the soil. The diffusion and conduction characteristics of the flame need to be accurately calculated and simulated during the design stage.

[0096] Flame uniformity: To ensure the uniformity of the flame, the burner nozzle needs to have good air flow regulation function. The selection of the nozzle should not only ensure uniform heat distribution of the flame, but also avoid local overheating or uneven temperature, which may affect the disinfection effect.

[0097] Furthermore, the acquisition unit includes a speed collector 4 installed on the rotary tillage machine body 1, a temperature and humidity sensor 6 installed on the rotary tillage blade 2, and a depth collector 5 installed on the top plate of the rotary tillage machine body 1;

[0098] The control unit determines the combustion mode based on the acquisition data of the depth collector;

[0099] The control unit determines its combustion temperature T based on the acquisition data of the temperature collector and the rotation speed of the blade;

[0100] The control unit determines its combustion duration t based on the data of the humidity collector, depth collector, and speed collector;

[0101] The control unit determines the injection frequency f of the flame based on the rotation speed of the blade and the data of the speed collector;

[0102] The control unit determines the unit combustion volume V based on the depth collector.

[0103] It should be noted that:

[0104] In an embodiment of the present application, the temperature collector is a soil temperature sensor: with an accuracy of ±1°C, it monitors the soil temperature in real time and automatically adjusts the flame temperature according to the temperature.

[0105] The humidity collector is a soil humidity sensor: with an accuracy of ±3%, a measurement range of 0% - 100%, it monitors the soil humidity in real time to adjust the flame injection height.

[0106] The depth collector 5 is an infrared depth sensor: it monitors the depth of rotary tillage to ensure the best operation effect for each rotary tillage.

[0107] The speed collector is a speed sensor;

[0108] The rotation speed n of the blade is obtained from the rotation speed of the motor driving the rotation of the rotary tillage machine body.

[0109] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0110] Embodiment

[0111] 1. Equipment configuration and environmental parameters

[0112] Rotary tillage body: Adopts a miniaturized design, with dimensions of 1.0m×0.6m×0.7m, a weight of 30kg, equipped with 8 high-strength alloy steel cutters, the adjustable range of rotary tillage depth is 0 - 30cm, and the pressure of the hydraulic drive system is set to 220 bar.

[0113] Flame treatment unit: Configured with 5 LPG burners, each LPG burner is equipped with a nozzle, the nozzle diameter is 20mm, evenly distributed behind the rotary tillage blades, and the power of each burner is 4kW.

[0114] Acquisition unit:

[0115] Soil temperature sensor (accuracy ±1°C), soil humidity sensor (accuracy ±3%), rotary tillage depth sensor (accuracy ±0.5cm), forward speed sensor (accuracy ±0.1m / s).

[0116] Control unit: Integrated with PID algorithm, the parameters are set as Kp = 0.8, Ki = 0.2, Kd = 0.1, and the sampling frequency is 10Hz.

[0117] 2. Specific working process:

[0118] Step 1: Real-time acquisition of rotary tillage parameters

[0119] After the equipment is started, the parameters obtained in real time through the acquisition unit are:

[0120] Rotary tillage speed v: 0.3m / s (automatically adjusted according to soil hardness).

[0121] Rotary tillage depth D: Set to 20cm (0cm - 10cm on the surface layer, 10cm - 20cm on the deep layer).

[0122] Actual soil temperature T: 25°C on the surface layer, 18°C on the deep layer.

[0123] Soil humidity: 15% on the surface layer, 20% on the deep layer.

[0124] Step 2: Stratified disinfection strategy

[0125] Dynamically divide the disinfection levels according to the rotary tillage depth:

[0126] The specific parameters for surface disinfection (0 cm - 10 cm) are as follows:

[0127] Combustion temperature target T: 500 °C (PID regulates the gas flow rate Q in real time).

[0128] Spit fire frequency f: Calculated by the formula f = N·v / 60, with the blade rotation speed N = 120 rpm, so f = 120×0.3 / 60 = 0.6 Hz (i.e., high-frequency short pulses, interval ≤ 0.1 s).

[0129] Gas flow rate Q 表层 = 0.6×0.3×1200 kg / m 3 = 216 kg / h (soil density ρ soil = 1200 kg / m 3 ).

[0130] The specific parameters for deep disinfection (10 cm - 20 cm) are as follows:

[0131] Combustion temperature target T: 450 °C.

[0132] Spit fire frequency f: Low-frequency long pulses, interval ≥ 0.5 s.

[0133] Gas flow rate Q 深层 = 0.4×0.3×1200×0.2 ≈ 63.8 kg / h (disinfection depth D = 0.2 m).

[0134] Step 3: Dynamic flame control

[0135] Pulse injection timing: Injection is triggered when the rotary tillage blade rotates to the vertically downward position. The combustion duration t is calculated by the formula:

[0136] For the surface layer, t1 = 0.2×0.1 / 0.3 + 0.05×(15% / 10%) = 0.067 + 0.075 = 0.142 s.

[0137] For the deep layer, t2 = 0.2×0.2 / 0.3 + 0.05×(20% / 10%) = 0.133 + 0.1 = 0.233 s.

[0138] PID temperature control: According to the real-time soil temperature feedback, adjust the gas flow rate to ensure that the surface temperature is stable at 500 °C - 550 °C and the deep layer temperature is at 400 °C - 450 °C.

[0139] Step 4: Protect beneficial microorganisms

[0140] Stratified isolation: After rapid surface disinfection (0 - 10 cm), retain the organic matter layer below 5 cm to avoid destroying the beneficial microorganism community at high temperatures.

[0141] Nozzle Angle Adjustment: During deep disinfection, the flame nozzle tilts downward by 15° to reduce heat diffusion to the middle layer.

[0142] 3. Effect Verification

[0143] Table 1 shows the results of soil high-temperature disinfection after using the flame sterilization method of Embodiment 1 of the present application:

[0144] Table 1 High-Temperature Disinfection Results

[0145]

[0146] As can be seen from Table 1, the present invention has a killing rate of soil-borne pathogens (such as tomato root rot pathogens) ≥ 98% and an inactivation rate of deep-layer nematodes ≥ 95%. The killing rates of pathogens in the surface layer and deep layer can reach 97%, which is significantly higher than that of traditional chemical sterilization (85% - 90%). It has a significant bactericidal effect. Thus, through the differential temperature control strategy of the present application, the problem of the stubbornness of deep-layer pathogens is effectively solved, and the sterilization effect is significantly better than that of traditional methods.

[0147] Table 2 shows the health assessment of the soil after high-temperature sterilization in Embodiment 1 of the present application:

[0148] Table 2 Soil Health Assessment Table

[0149]

[0150] As can be seen from Table 2, the present invention has the least impact on the physical and chemical properties and microbial activity of the soil, and the organic matter and enzyme activity remain stable. The survival rate of beneficial microorganisms (Bacillus and Actinomycetes) ≥ 85%, which is significantly higher than that of chemical disinfection (survival rate ≤ 5%). And the soil is healthy: the retention rate of microbial activity in the organic matter layer > 80%, and the soil aggregate structure is not damaged. Thus, through precise stratified temperature control, beneficial microorganisms and the organic matter layer are protected, and the soil ecological balance is maintained. From the above results, it can be seen that through the stratified dynamic flame control technology, the balance between precise sterilization and soil health is achieved, which is applicable to the prevention and control of soil-borne diseases of crops such as tomatoes and peppers in facility agriculture, and has the advantages of high efficiency, environmental protection and economy.

Claims

1. A method for soil flame sterilization, characterized in that, The sterilization method includes: Obtaining in real time the rotary tillage speed, rotary tillage depth, and the temperature and humidity of the working soil during rotary tillage operations; Implementing a layered disinfection strategy for the working soil based on the rotary tillage depth, and dynamically adjusting the combustion parameters of the sterilization flame based on the collected temperature, humidity, and rotary tillage speed of the working soil; The layered disinfection strategy is to dynamically adjust the combustion mode of the sterilization flame according to the rotary tillage depth.

2. The soil flame sterilization method according to claim 1, characterized in that, The combustion modes of the sterilization flame include: For the surface working soil, high-frequency short-pulse flame rapid combustion sterilization is used, with a combustion temperature of 500°C to 550°C; For the deep working soil, low-frequency long-pulse flame penetration sterilization is used, with a combustion temperature of 400°C to 450°C; Among them, high-frequency short pulse: pulse interval ≤ 0.1 s; low-frequency long pulse: pulse interval ≥ 0.5 s.

3. The method for soil flame sterilization according to claim 1, characterized in that, The combustion parameters include: combustion duration t, combustion temperature T, flame spraying frequency f, and unit combustion volume V.

4. A soil flame sterilization method according to claim 3, characterized in that, The combustion temperature T is determined by the PID control algorithm based on the temperature of the soil and the rotational speed of the blade, and the calculation formula is: Where: K p is the proportionality coefficient, K i is the integral coefficient, K d is the differential coefficient, T 目标 is the target temperature of the burning soil, in °C; T 实际 is the actually collected soil temperature, in °C.

5. A soil flame sterilization method according to claim 2, characterized in that, The combustion temperature T is controlled by the flow rate Q of the combustion medium, and its calculation formula is: Q = k·n·ρ Where: n is the rotational speed, with the unit of r / min; ρ is the soil density, with the unit of kg / m 3 ; k is the correction factor.

6. A method for soil flame sterilization according to claim 4, characterized in that The combustion duration t is determined based on the humidity of the soil, rotary tillage depth, and forward speed, and its expression is: t = 0.2D / v + Δt 湿度 Where D is the target disinfection depth in m; v is the forward speed in m / s; Δt 湿度 is the soil moisture compensation.

7. A method for soil flame sterilization according to claim 4, characterized in that, The flame spraying frequency is proportional to the blade rotational speed and forward speed to ensure that the flame coverage is synchronized with the rotary tillage progress. The flame spraying frequency f satisfies the calculation formula: f = N·v / 60 In the formula, N is the blade rotational speed, unit rpm; v is the forward speed, unit m / s.

8. A method for soil flame sterilization according to claim 4, characterized in that, The calculation formula for the unit combustion volume V is: V = π·r 2 ·d·η In the formula, r: flame diffusion radius, unit m; d: soil turning depth, unit m; η: thermal efficiency coefficient.

9. A soil flame sterilization device, characterized in that, The sterilization device is used for a soil flame sterilization method according to any one of claims 1 to 8. The sterilization device includes: A rotary tillage body, with a number of rotary tillage blades arranged at intervals along the extension direction. The rotary tillage blades are installed on the rotary tillage body; A flame treatment unit, including a nozzle and a burner. The nozzle is installed on the rotary tillage body, behind the rotary tillage blade, and the nozzle is connected to the burner; A collection unit for collecting the rotary tillage speed, rotary tillage depth, and the temperature and humidity of the working soil of the rotary tillage body; A control unit, which is respectively connected to the controller of the rotary tillage body and the burner. The control unit determines the combustion mode and dynamically adjusts the combustion parameters of the sterilization flame of the burner based on the working state of the rotary tillage body and the collected data of the collection unit.

10. A soil flame sterilization device according to claim 9, characterized in that, The collection unit includes a speed collector and a depth collector installed on the rotary tillage body, a temperature collector and a humidity collector installed on the blade; The control unit determines the combustion mode based on the collected data of the depth collector; The control unit determines its combustion temperature T based on the collected data of the temperature collector and the rotational speed of the blade; The control unit determines its combustion duration t based on the data of the humidity collector, depth collector, and speed collector; The control unit determines the flame spraying frequency f based on the rotational speed of the blade and the data of the speed collector; The control unit determines the unit combustion volume V based on the depth collector.

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