Biogas slurry pretreatment method and device based on pear leaf fertilizer and drip irrigation fertilizer

Abstract

The invention relates to the technical field of biogas slurry treatment, in particular to a biogas slurry pretreatment device based on a pear leaf fertilizer and a drip irrigation fertilizer, the biogas slurry pretreatment device comprises a reaction tank and a functional tank arranged in the reaction tank, and a functional body is slidably mounted on the inner wall of the functional tank; a mixing and blending area is formed between the bottom of the functional body and the inner bottom of the functional pool, and a functional channel penetrating to the bottom of the functional body is formed in the top of the functional body; the acid injection assembly is used for adding acid liquor into the mixing and blending area; a plurality of liquid inlet grooves are formed in the outer wall of the functional tank in the mixing and blending area in a penetrating manner, and the liquid inlet grooves are positioned below the liquid level of the reaction tank; in an initial state, the functional body seals the plurality of liquid inlet grooves; in the acid adjusting state, the functional body moves upwards, the liquid inlet groove is opened, the acid injection assembly works, and the functional body moves downwards to close the liquid inlet groove. According to the biogas slurry acid adjusting device, mixed acid adjusting of biogas slurry can be effectively achieved, the biogas slurry can be accurately monitored, and meanwhile the PH sensor can be maintained on line.

Description

Technical Field

[0001] This invention relates to the technical field of biogas slurry treatment, specifically to a biogas slurry pretreatment method and apparatus based on pear foliar fertilizer and drip irrigation fertilizer. Background Technology

[0002] With the development of ecological agriculture and circular economy, biogas slurry, as an organic liquid fertilizer rich in organic matter and nutrients such as nitrogen, phosphorus, and potassium, is receiving increasing attention for its resource utilization in cash crops such as pear trees. Achieving integrated water and fertilizer management through drip irrigation or foliar spraying is an important direction for enhancing the value of biogas slurry and realizing precision fertilization. However, biogas slurry must undergo effective pretreatment before direct application, one of the key steps being pH adjustment. Biogas slurry is mostly weakly alkaline, and acid solution needs to be added to adjust its pH value to the optimal range for crop nutrient absorption (such as pH 6.0-7.5) to avoid soil alkalization and improve the availability of nutrients such as phosphorus, iron, and zinc.

[0003] Currently, in large-scale biogas slurry pretreatment, pH adjustment is usually achieved by directly injecting acid (such as phosphoric acid, citric acid, etc.) into the storage or mixing tank. This method has obvious technical defects and severely restricts the treatment effect. Due to the high concentration and density of the acid, direct injection easily forms a momentary high-concentration reaction zone near the injection point. The violent acid-base neutralization reaction in this area will release heat instantaneously, causing the concentration product of calcium, magnesium, phosphate and other ions in the biogas slurry to exceed the solubility product instantly, thereby triggering a large amount of inorganic salt crystal precipitation such as calcium phosphate and magnesium phosphate. These precipitates not only cause nutrient loss, but also easily adhere to the tank walls, pipes and pump valves, forming a scale layer that is difficult to clean. This is the primary cause of blockage in drip irrigation systems. Moreover, existing technologies mostly rely on simple mechanical stirring or fluid diffusion, which makes it difficult to mix high-concentration acid with a large amount of biogas slurry evenly in a short time. Insufficient mixing leads to uneven spatial distribution of pH value in the tank, resulting in "acid-base pockets". Summary of the Invention

[0004] This invention provides a method and apparatus for pretreatment of biogas slurry based on pear foliar fertilizer and drip irrigation fertilizer, which can effectively achieve mixing and acidification of biogas slurry, accurately monitor biogas slurry, and maintain the pH sensor online.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer includes: A reaction tank, with a functional tank disposed within it, wherein a functional body is slidably mounted on the inner wall of the functional tank; a mixing and blending area is formed between the bottom of the functional body and the bottom of the functional tank, and a functional channel extending from the top of the functional body to its bottom is provided; an acid injection component is used to add acid to the mixing and blending area; multiple liquid inlet slots are provided through the outer wall of the functional tank located in the mixing and blending area, and the liquid inlet slots are located below the liquid surface of the reaction tank; in the initial state, the functional body closes the multiple liquid inlet slots; in the acid adjustment state, the functional body moves upward and opens the liquid inlet slots, the acid injection component operates, the functional body moves downward and closes the liquid inlet slots, and during the continuous downward movement, the mixed liquid is output upward through the functional channel and transferred into the reaction tank, completing the mixing and pre-dilution.

[0006] Optionally, the functional body has a functional cavity inside, and the inner wall of the functional cavity has a liquid inlet communicating with the inside of the reaction tank. A drain trough is formed through the inner wall of the functional tank above the liquid inlet trough. The drain trough is offset from the liquid inlet trough. A pH sensor is fixedly installed at the top of the functional cavity. The drain trough is located above the liquid surface of the reaction tank. A drain outlet is formed through the inner wall of the lowest point of the functional cavity. In the working state, when the functional body moves downward to a preset position, the liquid inlet connects with the liquid inlet trough, and the functional cavity receives the test mixture from the reaction tank, placing the glass electrode of the pH sensor in the mixture. In the stopped state, when the functional body moves upward to a preset position, the drain outlet connects with the drain trough, releasing the measured mixture back into the reaction tank. This is a monitoring component used to monitor for pH sensor reading drift or inaccuracy.

[0007] Optionally, the monitoring component includes a second supply pipe connected to an external buffer pump source. The second supply pipe extends from the top of the functional body into the interior of the functional chamber. In the monitoring state, when the functional body is moved upward to its highest position, the drain port is sealed by the inner wall of the functional chamber. At the same time, the pump source operates to pump standard buffer solution into the functional chamber. If the pH sensor reads the correct value slowly or the reading drifts, it can be determined that the pH sensor is faulty. A cleaning component is also included for rinsing the glass electrode of the pH sensor.

[0008] Optionally, the cleaning assembly includes an annular pipe surrounding the glass electrode, with multiple spray holes on the annular pipe facing the outer wall of the glass electrode. A first liquid supply pipe is fixedly installed inside the functional cavity. One end of the first liquid supply pipe is tangent to and fixedly connected to the outer periphery of the annular pipe, and the other end of the first liquid supply pipe extends through the top of the functional body and is connected to an external deionized water pump source and a chemical cleaning liquid pump source.

[0009] Optionally, the functional channel includes a constricted section and a cylindrical section. The constricted section gradually narrows from bottom to top, and there is a smooth transition between the cylindrical section and the constricted section. The constricted section is frustum-shaped, and the top of the functional body is frustum-shaped. A target sputtering disk is fixedly installed on the top of the functional body above the cylindrical section by a support rod, making the bottom of the target sputtering disk hollow. The target sputtering disk has an arched design, and a water distribution groove is opened on the outer edge of the circumference.

[0010] Optionally, a water-breaking plate is fixedly installed at the lower opening of the constricted section. The water-breaking plate is a grid design, and the crossbeams and longitudinal stiles of the water-breaking plate are both designed with sharp water-breaking features.

[0011] Optionally, the acid injection assembly includes a nozzle opening on the functional pool, the nozzle opening being located below the liquid inlet tank, and the nozzle opening forming an angle with the central axis of the functional pool, the angle ranging from 15 degrees to 30 degrees.

[0012] Optionally, an assembly plate is fixedly installed on the top of the reaction tank, an equipment box is installed on the assembly plate, a cylinder assembly is fixedly installed on the equipment box, and the output end of the cylinder assembly is connected to the top of the functional body for transmission.

[0013] A biogas slurry pretreatment method based on pear foliar fertilizer and drip irrigation fertilizer includes a stirring structure in a reaction tank and the following steps: S1. Initial Mixing: The stirring structure in the reaction tank is activated, driving the functional body to move upward and enter the acid adjustment state. At the same time, acid is injected into the mixing and blending area using the acid injection component, so that the biogas slurry in the reaction tank enters the mixing and blending area through the liquid inlet tank. The high-low difference is used to carry out primary mixing and pre-dilution of the acid.

[0014] S2, Strong Mixing: The functional body is moved up and down repeatedly so that the biogas slurry in the reaction tank enters the mixing and blending area and is then output back into the reaction tank through the functional channel, forming a forced reflux and completing the forced mixing at the same time.

[0015] S3, pH measurement: After mixing to a certain extent, the functional body moves downward to a preset position, so that the inlet is connected to the inlet tank, so that the functional cavity receives the biogas slurry to be tested from the reaction tank, and the glass electrode of the pH sensor is located in the mixed liquid, thus completing the independent pH measurement of the biogas slurry.

[0016] S4. Repeat acid adjustment: If the pH value does not reach the standard range, repeat S1 to S3.

[0017] Optionally, S3 also includes the following steps: T1. Monitoring and Calibration: When the pH value has a large error and deviates too much from the predicted result, the functional body enters the monitoring state. When the functional body is driven to move upward to the highest position, the drain port is sealed by the inner wall of the functional pool. At the same time, the pump source works to pump standard buffer solution into the functional chamber. If the pH sensor reads the correct value slowly or the reading drifts, it can be determined that the pH sensor is faulty, and further testing can be carried out.

[0018] T2 Cleaning Mode: Even after fine filtration, the biogas slurry may still contain residual lipids or proteins, which can contaminate the gel layer on the outside of the glass electrode and affect its accuracy. In this case, the deionized water pump or chemical cleaning solution pump is driven to rinse the outside of the glass electrode through the spray holes on the annular pipe.

[0019] This invention provides a method and apparatus for pretreating biogas slurry based on pear foliar fertilizer and drip irrigation fertilizer, which has the following advantages compared with the prior art: 1. By coordinating the functional body and the functional pool, a "pool within a pool" structure is formed. When the functional body moves up and down, it transfers the biogas slurry to be mixed in the reaction pool to the functional pool. Then, the mixed biogas slurry in the functional pool is returned to the reaction pool to complete the cycle. A small portion of high-quality mixed matter impacts and disturbs the majority of low-quality mixed matter, thereby gradually and efficiently completing acidification and mixing. In this process, the biogas slurry is first broken up by turbulence due to the height difference, so that it is fully mixed with the acid. Then, as the functional body moves down, it will mix the biogas slurry again and output it outwards. This process is repeated, so that small doses of acid can be added to gradually adjust the acid and mix, thereby improving the quality and uniformity of acidification.

[0020] Second, by moving the functional body up and down, the functional cavity can be connected to the biogas slurry or to the environment above the liquid surface, or the functional cavity can be closed, so that the functional cavity can become an independent cavity. This ensures that the functional cavity will not be continuously impacted by water flow or interfered with by debris, thus extending its service life. Furthermore, the independent environment ensures that the pH sensor will not be subject to excessive interference during the measurement process.

[0021] III. The coordination between the monitoring and cleaning components: When the control system detects an abnormal pH reading or reaches the predetermined maintenance cycle, the functional unit rises to its highest point, making the functional chamber a sealed container. Subsequently, the monitoring component pumps in a standard buffer solution with a known pH value through the second liquid supply pipe. In a pure and stable buffer solution environment, if the system detects an abnormally prolonged time to reach the correct reading, or if the value continues to drift and become unstable, it can be determined that the pH sensor has malfunctioned. Through the annular pipe surrounding the glass electrode, the multi-angle spray holes on it can form a three-dimensional rinse of the electrode surface without dead angles. Secondly, the surface loose impurities can be rinsed away first through the deionized water source connected to the first liquid supply pipe; then, switch to chemical cleaning solution to dissolve organic membranes or inorganic salt scale; finally, rinse with deionized water, thereby effectively monitoring and maintaining the pH sensor. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the external three-dimensional structure of the present invention; Figure 2 This is a three-dimensional schematic diagram of the assembled functional pool and functional body in this invention; Figure 3 For the present invention Figure 2 The right view; Figure 4 For the present invention along Figure 3 A schematic diagram of the structure viewed in section AA; Figure 5 For the present invention along Figure 3 A schematic diagram of the cross-section at point BB; Figure 6 For the present invention Figure 2 Internal structure diagram; Figure 7 This is a partial cross-sectional view of the functional cavity in this invention; Figure 8 In this invention Figure 2 Cross-sectional view and enlarged detail view of the water-breaking plate; Figure 9 This is an assembly diagram of the functional pool and functional body in another state in this invention; Figure 10 This is a cross-sectional schematic diagram of the connection between the liquid inlet and the liquid inlet tank in this invention.

[0023] In the diagram: 1. Reaction tank; 2. Functional tank; 3. Functional body; 4. Assembly plate; 5. Equipment box; 6. Liquid inlet tank; 7. Liquid outlet tank; 8. Liquid inlet; 9. Liquid outlet; 11. Nozzle outlet; 12. Functional channel; 13. Targeted sputtering plate; 14. Functional cavity; 15. pH sensor; 16. Annular pipe; 17. First liquid supply pipe; 18. Water breaking plate; 19. Second liquid supply pipe. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1 to 10 This invention provides a technical solution: a biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer, comprising: The reaction tank 1 contains a functional tank 2, and a functional body 3 is slidably installed on the inner wall of the functional tank 2. The bottom of the functional body 3 and the bottom of the functional tank 2 form a mixing and blending area. A functional channel 12 extending from the top of the functional body 3 to its bottom is provided. An acid injection component is used to add acid to the mixing and blending area. Multiple liquid inlet grooves 6 are provided through the outer wall of the functional tank 2 located in the mixing and blending area, and the liquid inlet grooves 6 are located below the liquid surface of the reaction tank 1. In the initial state, the functional body 3 closes the multiple liquid inlet grooves 6. In the acid adjustment state, the functional body 3 moves upward and opens the liquid inlet grooves 6, the acid injection component works, the functional body 3 moves downward and closes the liquid inlet grooves 6, and during the continuous downward movement, the mixed liquid is output upward through the functional channel 12 and transferred into the reaction tank 1 to complete the mixing and pre-dilution.

[0026] In existing technologies, the pH value of biogas slurry needs to be adjusted after primary and fine filtration. This adjustment is necessary both before and after mixing, as the acidity or alkalinity of the fertilizer after mixing can affect the overall pH value. However, current methods of adjusting biogas slurry by directly injecting acid can easily lead to the crystallization and precipitation of inorganic salts. These precipitates not only cause nutrient loss but also easily adhere to the tank walls, pipes, and pump valves, forming a difficult-to-clean scale layer. In this design, a tank-within-a-tank, i.e., a functional tank 2 within the reaction tank 1, is incorporated. Simultaneously, a loop is completed, utilizing the vertical displacement of the functional unit 3 to transfer the biogas slurry to be mixed in the reaction tank 1 to the functional tank. In pool 2, the biogas slurry mixed in functional pool 2 is returned to the interior of reaction pool 1 to complete the circulation. A small portion of high-quality mixed matter impacts and disturbs most of the low-quality mixed matter, thereby gradually and efficiently completing acidification and mixing. In this forced reflux mixing process, the biogas slurry will first undergo turbulent breakup due to the height difference, so that it is fully mixed with the acid. Then, as functional body 3 moves downward, it will cause the biogas slurry to be mixed again and output outward. This process is repeated, so that acid can be added in small doses to gradually adjust the acid and mix, while improving the quality and uniformity of acidification, and avoiding spatial unevenness of pH value, which would affect the final output quality.

[0027] In a preferred embodiment, the functional body 3 has a functional cavity 14 inside. The inner wall of the functional cavity 14 has an inlet 8 that communicates with the inside of the reaction tank 1. The inner wall of the functional tank 2, located above the inlet tank 6, has a drain tank 7 that runs through it. The drain tank 7 is offset from the inlet tank 6. A pH sensor 15 is fixedly installed at the top of the functional cavity 14. The drain tank 7 is located above the liquid surface of the reaction tank 1. A drain port 9 runs through it on the inner wall of the lowest point of the functional cavity 14. In the working state, when the functional body 3 moves downward to a preset position, the inlet 8 connects with the inlet tank 6, and the functional cavity 14 receives the mixture to be tested from the reaction tank 1, so that the glass electrode of the pH sensor 15 is located in the mixture. In the stopped state, when the functional body 3 moves upward to a preset position, the drain port 9 connects with the drain tank 7, and the measured mixture is released back into the reaction tank 1. This is a monitoring component used to monitor for reading drift or inaccuracy of the pH sensor 15.

[0028] In existing technologies, pH sensors are directly installed in pipes or tanks, making them highly susceptible to contamination or interference. Furthermore, the glass electrodes are easily impacted by water flow, significantly reducing the accuracy and lifespan of the pH sensor. In this embodiment, please refer to... Figures 2 to 10 In this embodiment, the vertical displacement of the functional body 3 allows the functional cavity 14 to either communicate with the biogas slurry or with the environment above the liquid surface, or to close the functional cavity 14. This allows the functional cavity 14 to become an independent cavity, thereby ensuring that the functional cavity 14 will not be continuously impacted by water flow or interfered with by debris, thus extending its service life. Secondly, the independent environment prevents the pH sensor 15 from being excessively interfered with during the measurement process. During the measurement process, the pH environment inside the reaction tank 1 is uneven, which can cause the pH sensor 15 to deviate in its measurement, thereby interfering with the work of the personnel in charge of the preparation.

[0029] Based on the pH measurement embodiment, an implementation scheme for a monitoring component is provided.

[0030] The monitoring component includes a second supply pipe 19 connected to an external buffer pump source. The second supply pipe 19 extends from the top of the functional body 3 into the interior of the functional chamber 14. In the monitoring state, when the functional body 3 is moved upward to the highest position, the drain port 9 is sealed by the inner wall of the functional pool 2. At the same time, the pump source works to pump standard buffer solution into the functional chamber 14. If the pH sensor 15 reads the correct value slowly or the reading drifts, it can be determined that the pH sensor 15 is faulty. A cleaning component is used to rinse the glass electrode of the pH sensor 15.

[0031] In existing technologies, fine filtration, such as 200 mesh, mainly removes fibers and large particulate matter, but cannot remove smaller substances such as humic acid, fulvic acid from raw material decomposition, polysaccharides, proteins, and lipids. These substances can form a dense organic film on the surface of the hydrated gel layer of the electrode through hydrogen bonds, van der Waals forces, or direct adsorption, severely hindering the contact and exchange of hydrogen ions with the gel layer. This is the main reason for slow response and reading drift. Therefore, when reading drift occurs, it is necessary to test it to identify the problem and deal with it in time. In this embodiment, when in monitoring state, that is, when the functional body 3 is moved upward to the highest position, the functional cavity 14 forms an independent and sealed space. At this time, the detection liquid, i.e., the standard buffer solution, with a pH value of 4 or 7, is injected into the functional cavity 14. The pH value of the standard buffer solution is measured by the pH sensor 15. If the measurement of the correct value is too slow or the reading drifts, it can be determined that the pH sensor 15 has failed. In actual use, it can quickly test and react, ensuring that it does not affect the acidity measurement of the biogas slurry.

[0032] In addition, the filtered biogas slurry contains small amounts of inorganic salt ions and bacteria, which may cause problems such as malfunction or drift of the glass electrode.

[0033] Another important advantage of this embodiment is that if the gel layer of the glass electrode ages or becomes unbalanced, the glass electrode can be immersed in a standard buffer solution to stabilize the gel layer and regenerate or activate the hydrogel layer. The specific principle is that the buffer solution provides a standard environment with stable ionic strength and a precisely known pH for the gel layer, which allows the disordered gel layer to re-establish a stable and correct ion exchange balance, especially to repair abnormal membrane potential caused by internal and external imbalances and mild poisoning.

[0034] Furthermore, an implementation scheme for a cleanroom component is provided.

[0035] The cleaning assembly includes an annular pipe 16 surrounding the glass electrode. Multiple spray holes are provided on the annular pipe 16 facing the outer wall of the glass electrode. A first liquid supply pipe 17 is fixedly installed within the functional cavity 14. One end of the first liquid supply pipe 17 is tangential to and fixedly connected to the outer periphery of the annular pipe 16, and the other end of the first liquid supply pipe 17 extends through the top of the functional body 3 and is connected to an external deionized water pump source and a chemical cleaning solution pump source. In the prior art, as mentioned above, in addition to lipids and proteins, there are also organic contaminants. Therefore, the glass electrode needs to be cleaned to varying degrees. First, deionized water can be used to rinse away loose particles on its surface. Then, targeted chemical cleaning can be performed to remove organic contaminants or inorganic salts. Finally, deionized water can be used to rinse away chemical solvents. Finally, calibration is performed in a standard buffer solution, thereby greatly extending the service life of the pH sensor 15 and ensuring timely cleaning to guarantee the accuracy of the pH sensor 15.

[0036] Among them, deionized water and preferred chemical cleaning solutions have minimal impact on biogas slurry, which is insufficient to affect its normal formulation and use.

[0037] Furthermore, the functional channel 12 includes a constricted section and a cylindrical section. The constricted section gradually narrows from bottom to top, and there is a smooth transition between the cylindrical section and the constricted section. The constricted section is frustoconical in shape, and the top of the functional body 3 is frustoconical in shape. A target sputtering disk 13 is fixedly installed on the top of the functional body 3 above the cylindrical section by a support rod, making the lower part of the target sputtering disk 13 hollow. The target sputtering disk 13 has an arched design, and a water distribution groove is opened on the outer edge of the circumference. Please refer to [link to relevant documentation]. Figure 5 and Figure 6 In this embodiment, in order to further improve the mixing of biogas slurry, when the biogas slurry enters the cylindrical section from the constricted section, the flow cross-sectional area gradually decreases, which will accelerate the biogas slurry during the upward swimming process, thereby increasing its kinetic energy to impact the target sputtering disk 13, making its breakage and diversion more thorough. When these broken droplets are splashed into the reaction tank 1, the diffusion is enhanced, thereby better completing the mixing and acidification process.

[0038] Furthermore, a water-breaking plate 18 is fixedly installed at the lower opening of the constricted section. The water-breaking plate 18 has a grid design, and both the crossbeams and the lower part of the longitudinal stiles of the water-breaking plate 18 have sharp water-breaking designs. Please refer to [link / reference needed]. Figure 8 The enlarged view shows that, in this embodiment, the grid and sharp water-breaking design are both for breaking and separating the biogas slurry and turbulence, so that it can be better mixed and acidified.

[0039] In a preferred embodiment, the acid injection component includes a nozzle 11 located on the functional pool 2, below the liquid inlet 6, and the nozzle 11 forms an angle with the central axis of the functional pool 2, with the angle ranging from 15 degrees to 30 degrees. By designing the acid injection angle, it is possible to promote the dispersion of acid in the cross-section and ensure a considerable axial force, so that the acid can quickly diffuse downstream, thereby cooperating with the axial mixing force generated by the functional body 3 to achieve homogenization through the shortest path.

[0040] Furthermore, an assembly plate 4 is fixedly installed on the top of the reaction tank 1, an equipment box 5 is installed on the assembly plate 4, and a cylinder assembly is fixedly installed on the equipment box 5. The output end of the cylinder assembly is connected to the top of the functional body 3. All pump sources in this case can be connected through hoses, thereby ensuring that each pump source can be used normally and without interference during the displacement of 03. Secondly, the sliding connection between the functional tank 2 and the functional body 3 is not a complete piston fit, and their gap will not be interfered with by biogas slurry particles.

[0041] By utilizing the combination of the above structures, it is possible to effectively mix and adjust the acidity of biogas slurry, accurately monitor the biogas slurry, and maintain the pH sensor 15 online.

[0042] A method for pretreating biogas slurry based on pear foliar fertilizer and drip irrigation fertilizer includes a biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer, a stirring structure in a reaction tank 1, and the following steps: S1. Initial mixing: The stirring structure in the reaction tank 1 is activated, driving the functional body 3 to move upward and enter the acid adjustment state. At the same time, acid is injected into the mixing and preparation area using the acid injection component, so that the biogas slurry in the reaction tank 1 enters the mixing and preparation area through the liquid inlet tank 6. The high-low difference is used to carry out primary mixing and pre-dilution of the acid.

[0043] S2, Strong Mixing: The functional body 3 is moved up and down repeatedly so that the biogas slurry in the reaction tank 1 enters the mixing and blending area and is then output back into the reaction tank 1 through the functional channel 12, forming a forced reflux and completing the forced mixing at the same time.

[0044] S3, pH measurement; After mixing to a certain extent, the functional body 3 is moved downward to a preset position, so that the liquid inlet 8 is connected with the liquid inlet tank 6, so that the functional chamber 14 receives the biogas slurry to be tested from the reaction tank 1, and the glass electrode of the pH sensor 15 is located in the mixed liquid, thus completing the independent pH measurement of the biogas slurry object.

[0045] S4. Repeat acid adjustment: If the pH value does not reach the standard range, repeat S1 to S3.

[0046] In this case, compared with the existing pretreatment methods, a more refined and effective mixing method is used. At the same time, the acid solution can be diluted and mixed in segments to improve the mixing quality and efficiency and avoid the problems caused by direct input. Secondly, the independent functional chamber 14 can improve the accuracy of pH measurement and also provide a certain degree of protection for pH sensor 15.

[0047] Furthermore, S3 also includes the following steps: T1. Monitoring and Calibration: When the pH value has a large error and deviates too much from the predicted result, the functional body 3 enters the monitoring state. When the functional body 3 is driven to move upward to the highest position, the drain port 9 is sealed by the inner wall of the functional pool 2. At the same time, the pump source works to pump standard buffer solution into the functional chamber 14. If the pH sensor 15 reads the correct value slowly or the reading drifts, it can be determined that the pH sensor 15 is faulty, and further testing can be carried out.

[0048] T2 Cleaning Mode: Even after fine filtration, the biogas slurry may still contain residual lipids or proteins, which can contaminate the gel layer on the outside of the glass electrode and affect its accuracy. In this case, the deionized water pump or chemical cleaning solution pump is driven to rinse the outside of the glass electrode through the spray hole on the annular pipe 16.

[0049] This method primarily monitors and responds to the usage of the glass electrode, preventing pH sensor 15 from experiencing reading drift.

[0050] The standard parts used in the embodiments can be purchased directly from the market, and the non-standard structural parts described in the specification and drawings can also be processed without any doubt based on existing technical common sense. At the same time, the connection methods of each component adopt mature conventional methods in the prior art, and the machinery, parts and equipment all adopt conventional models in the prior art, so they will not be described in detail here.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer, characterized in that: include: A reaction tank (1), a functional tank (2) disposed therein, wherein a functional body (3) is slidably installed on the inner wall of the functional tank (2); The bottom of the functional body (3) and the bottom of the functional pool (2) form a mixing and blending area, and the top of the functional body (3) is provided with a functional channel (12) that extends through to its bottom. An acid injection assembly used to add acid to the mixing and blending area; Multiple liquid inlet tanks (6) are provided through the outer wall of the functional tank (2) located in the mixing and blending area, and the liquid inlet tanks (6) are located below the liquid surface of the reaction tank (1); In the initial state, the functional body (3) closes multiple liquid inlet tanks (6); In the acid-adjusting state, the functional body (3) moves upward and opens the liquid inlet tank (6), the acid injection component works, the functional body (3) moves downward and closes the liquid inlet tank (6), and during the continuous downward movement, the mixed liquid is output upward through the functional channel (12) and transferred to the reaction tank (1) to complete the mixing and pre-dilution.

2. The biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer according to claim 1, characterized in that: The functional body (3) has a functional cavity (14) inside. The inner wall of the functional cavity (14) has an inlet (8) that communicates with the inside of the reaction tank (1). The inner wall of the functional tank (2) located above the inlet tank (6) has a drain tank (7) that runs through it. The drain tank (7) is misaligned with the inlet tank (6). A pH sensor (15) is fixedly installed on the top of the functional cavity (14). The drain tank (7) is located above the liquid surface of the reaction tank (1). The inner wall of the lowest part of the functional cavity (14) has a drain port (9) that runs through it. When the functional body (3) moves downward to the preset position during operation, the liquid inlet (8) docks with the liquid inlet tank (6), the functional cavity (14) receives the test mixture from the reaction tank (1), and the glass electrode of the pH sensor (15) is located in the mixture. When the test is stopped, the functional body (3) moves upward to the preset position, the drain port (9) connects with the drain tank (7) to release the tested mixture back into the reaction tank (1); A monitoring component used to monitor for reading drift or inaccuracy in the pH sensor (15).

3. The biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer according to claim 2, characterized in that: The monitoring component includes a second supply pipe (19) connected to an external buffer pump source. The second supply pipe (19) extends from the top of the functional body (3) into the interior of the functional cavity (14). In the monitoring state, when the functional body (3) moves upward to the highest position, the drain port (9) is sealed by the inner wall of the functional pool (2). At the same time, the pump source works to pump standard buffer solution into the interior of the functional cavity (14). If the pH sensor (15) reads the correct value slowly or the reading drifts, it can be determined that the pH sensor (15) has malfunctioned. A cleaning assembly for rinsing the glass electrode of the pH sensor (15).

4. The biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer according to claim 3, characterized in that: The clean assembly includes an annular pipe (16) surrounding the glass electrode. The annular pipe (16) has multiple spray holes facing the outer wall of the glass electrode. A first liquid supply pipe (17) is fixedly installed in the functional cavity (14). One end of the first liquid supply pipe (17) is tangent to and fixedly connected to the outer periphery of the annular pipe (16). The other end of the first liquid supply pipe (17) passes through the top of the functional body (3) and is associated with an external deionized water pump source and a chemical cleaning liquid pump source.

5. The biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer according to claim 4, characterized in that: The functional channel (12) includes a constricted section and a cylindrical section. The constricted section gradually narrows from bottom to top. The cylindrical section and the constricted section have a smooth transition. The constricted section is frustum-shaped. The top of the functional body (3) is frustum-shaped. The top of the functional body (3) located above the cylindrical section is fixedly installed with a target sputtering disk (13) by a support rod, so that the bottom of the target sputtering disk (13) is hollow. The target sputtering disk (13) has an arched design and a water distribution groove is opened on the outer edge of the circumference.

6. The biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer according to claim 5, characterized in that: A water-breaking plate (18) is fixedly installed at the lower opening of the constricted section. The water-breaking plate (18) is a grid design, and the crossbeams and longitudinal stiles of the water-breaking plate (18) are both designed with sharp water-breaking features.

7. The biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer according to claim 5, characterized in that: The acid injection assembly includes a nozzle (11) opened on the functional pool (2), the nozzle (11) is located below the liquid inlet tank (6), and the nozzle (11) forms an angle with the central axis of the functional pool (2), the angle being between 15 degrees and 30 degrees.

8. The biogas slurry pretreatment device based on pear foliar fertilizer and drip irrigation fertilizer according to any one of claims 1-7, characterized in that: An assembly plate (4) is fixedly installed on the top of the reaction tank (1), an equipment box (5) is installed on the assembly plate (4), a cylinder assembly is fixedly installed on the equipment box (5), and the output end of the cylinder assembly is connected to the top of the functional body (3) via transmission.

9. A method for pretreating biogas slurry based on pear foliar fertilizer and drip irrigation fertilizer, comprising the biogas slurry pretreating device based on pear foliar fertilizer and drip irrigation fertilizer as described in claim 5, and further comprising a stirring structure in the reaction tank (1), characterized in that: It also includes the following steps: S1, Initial mixing: Start the stirring structure in the reaction tank (1), drive the functional body (3) to move upward and enter the acid adjustment state, and at the same time use the acid injection component to inject acid into the mixing and preparation area, so that the biogas slurry in the reaction tank (1) enters the mixing and preparation area through the liquid inlet tank (6), and uses the height difference to carry out primary mixing and pre-dilution of acid; S2, Strong Mixing: The functional body (3) moves up and down repeatedly so that the biogas slurry in the reaction tank (1) enters the mixing and blending area and is then output to the reaction tank (1) through the functional channel (12), forming a forced reflux and completing the forced mixing at the same time; S3, pH measurement; After mixing to a certain extent, the functional body (3) is moved downward to a preset position, so that the liquid inlet (8) is connected to the liquid inlet tank (6), so that the functional cavity (14) receives the biogas slurry to be measured from the reaction tank (1), and so that the glass electrode of the pH sensor (15) is located in the mixed liquid, thus completing the independent pH measurement of the biogas slurry object. S4. Repeat acid adjustment: If the pH value does not reach the standard range, repeat S1 to S3.

10. The biogas slurry pretreatment method based on pear foliar fertilizer and drip irrigation fertilizer according to claim 9, characterized in that: S3 also includes the following steps: T1. Monitoring and calibration: When the pH value has a large error and deviates too much from the predicted result, the functional body (3) is put into the monitoring state. When the functional body (3) is driven to move upward to the highest position, the drain port (9) is sealed by the inner wall of the functional pool (2). At the same time, the pump source works to pump standard buffer solution into the functional chamber (14). If the pH sensor (15) reads the correct value slowly or the reading drifts, it can be determined that the pH sensor (15) is faulty and further testing can be carried out. T2, Cleaning Mode: Even after fine filtration, the biogas slurry will still have residual lipids or proteins inside, which will contaminate the gel layer on the outside of the glass electrode and affect the accuracy. At this time, drive the deionized water pump or chemical cleaning liquid pump to rinse the outside of the glass electrode through the spray hole on the annular pipe (16).

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