Methods and systems for operation and maintenance services of biogas slurry resource utilization

Abstract

This invention relates to the field of operation and maintenance service management technology, and discloses a method and system for operation and maintenance service management of biogas slurry resource utilization, including: Step 1, establishing batch sampling and actual measurement, establishing a plot table, and obtaining nitrogen deficit; Step 2, calculating volume, intensity, and acidification dosage according to the parameter table, locking the process, and generating a prescription list; Step 3, using capacity and safety margin constraints for loading, segmenting by particle size, calculating weights, and locking the scheduling table; Step 4, acidifying and mixing thoroughly and verifying to the target pH, weighing and verifying again upon delivery, issuing a metering slip and shipping; Step 5, retesting pH and ammonia nitrogen to verify the prescription, and if qualified, the on-site parameters are read-only; Step 6, applying at a constant rate according to the prescription, reconciling dual-track metering, and recording faults for exceeding tolerances; Step 7, calculating the loss rate based on delivery, dual-track, and on-site actual measurement, comparing with thresholds for correction, and calculating the achievement rate of the three items. This invention realizes deterministic scheduling, unified metering standards, and traceable closed-loop management of biogas slurry throughout the entire process from delivery to soil application.

Description

Technical Field

[0001] This invention belongs to the field of operation and maintenance service management technology, specifically relating to the operation and maintenance service management method and system for biogas slurry resource utilization. Background Technology

[0002] Biogas slurry, as the main product of anaerobic treatment of livestock and poultry manure, is rich in nitrogen and can be directly returned to the field, making it an important resource for agricultural non-point source pollution control and coordinated development of agricultural production. However, in the current process of transporting biogas slurry to the field, there are common problems such as inconsistent metering methods, reliance on manual experience for scheduling, lack of closed-loop quality control, and lack of traceability in on-site implementation. These problems result in low utilization efficiency of biogas slurry, difficulty in accurately calculating nitrogen loss, high service costs, and difficulty in supervision.

[0003] In existing technologies, biogas slurry application mostly relies on manual scheduling and a single metering model. Vehicle loading is opaque, and there is a lack of consistent metering standards between the slurry delivery and soil application stages. Field operations typically depend on driver experience to control speed and spray volume, easily leading to unstable application intensity and uneven nitrogen distribution. Furthermore, key quality points such as acidification treatment, ammonia nitrogen concentration retesting, and on-site parameter verification often lack systematic and data-driven management, making it impossible to achieve full-process verification from slurry delivery to soil application. In addition, due to large differences in plot size and inconsistent service time windows, existing scheduling methods struggle to balance timeliness and loading matching, easily resulting in inefficient operations such as vehicle waiting and empty trips.

[0004] In the accounting process, the lack of dual-channel quantitative reconciliation of soil input and output volumes, coupled with the absence of concentration changes in the system's judgment, means that the final loss rate relies heavily on estimation, lacking a consistent calculation basis, which is detrimental to service settlement and regulatory traceability. The existing system also lacks clear triggering conditions and recording mechanisms for error correction, maintenance, and process recalculation, making it difficult to pinpoint the specific step in case of anomalies. Summary of the Invention

[0005] This invention provides a method and system for operation and maintenance service management of biogas slurry resource utilization, which solves the technical problems in related technologies such as the lack of unified data standards and closed-loop quality control, and the inability to achieve prescription-driven deterministic scheduling, dual-track metering reconciliation, and calculable and traceable loss rates under the constraints of service time windows, vehicle capacity, and safety margin.

[0006] This invention provides a method for operation and maintenance service management of biogas slurry resource utilization, comprising the following steps:

[0007] Step 1: Generate batch number and collect batch measured data to establish basic information of the land parcel. Based on the nitrogen target value in the basic information of the land parcel and the current available nitrogen amount, determine the nitrogen gap of the land parcel.

[0008] Step 2: Call the fixed process parameter table, determine the application volume and intensity of biogas slurry for the plot based on the batch measured data and the plot nitrogen deficit, determine the batch acidification dosage, select the locked application process parameters, and form a prescription parameter list;

[0009] Step 3: Loading is carried out under the constraints of vehicle capacity and safety margin, and the land is divided according to the granularity of land parcel division; the sorting weight is calculated, the scheduling order table is generated and written into the scheduling lock;

[0010] Step 4: Complete acidification and mixing according to the batch acidification dosage, check to the target pH according to the allowable pH deviation, weigh and verify the volume before leaving the warehouse to generate the outbound measurement sheet, and ship according to the scheduling sequence.

[0011] Step 5: On-site retesting of ammonia nitrogen concentration and pH, and verification against the prescription parameter list. If they match, set the on-site execution parameters to read-only.

[0012] Step 6: Apply the medication according to the prescription parameter list, at a constant driving speed, and use dual-track metering to reconcile the volume of the soil entering the machine. If the difference exceeds the allowable deviation of the volume, stop the machine and record the fault type.

[0013] Step 7: Determine the calculable loss rate based on the outbound measurement sheet, dual-track measurement, and on-site measurement, and compare it with the summarized allowable loss rate and volume allowable deviation. Correct the deviation based on the comparison results, and calculate the prescription achievement rate, time window achievement rate, and loss control rate.

[0014] Furthermore, the batch measured data includes ammonia nitrogen concentration, initial pH, and total volume of batch biogas slurry; the basic information of the land parcel includes land parcel area, nitrogen target value, current available nitrogen amount, and service time window;

[0015] The difference between the target nitrogen value and the current available nitrogen amount of the plot is calculated to obtain the plot's nitrogen deficit. The plot's nitrogen deficit, plot area, and service time window are bound according to the batch number to generate a batch plot binding table. The batch plot binding table only retains records with plot nitrogen deficits greater than zero and marks them as pending prescription status.

[0016] Furthermore, the application volume and intensity of biogas slurry for each plot are determined, the batch acidification dosage is determined, and the locked application process parameters are selected to form a prescription parameter list, including:

[0017] Step 11: Use the product of the plot's nitrogen deficit and the plot's area as the numerator, subtract the total allowable loss rate from the fixed process parameter table from 1 to obtain the effective retention rate, and use the product of the effective retention rate, ammonia nitrogen concentration, and nitrogen use efficiency as the denominator to obtain the plot's biogas slurry application volume; the fixed process parameter table includes nitrogen use efficiency, total allowable loss rate, acidification coefficient, target pH, pH tolerance, and process selection threshold;

[0018] Step 12: Calculate the ratio of the applied biogas slurry volume to the plot area to obtain the applied biogas slurry intensity. Multiply the acidification coefficient, initial pH, target pH, and the sum of the applied biogas slurry volumes of all plots to obtain the batch acidification dose.

[0019] Step 13: Select and lock the application process parameters according to the comparison results of the application intensity of biogas slurry on the plot and the process selection threshold. Summarize the application volume of biogas slurry on the plot, the application intensity of biogas slurry on the plot, the locked application process parameters and the service time window, and generate a prescription parameter list together with the batch acidification dose, target pH and pH allowable deviation.

[0020] Furthermore, load allocation is performed under constraints of vehicle capacity and safety margin, and the land parcels are divided at the granularity of land parcel segmentation; sorting weights are calculated, a scheduling order table is generated, and written into the scheduling lock, including:

[0021] Step 21: Combine vehicle capacity with safety margin to determine the effective capacity of each vehicle, and initialize the remaining capacity of each vehicle to the corresponding effective capacity. Generate a set of plots to be served based on plots with a biogas slurry application volume greater than zero.

[0022] Step 22: Divide the area of ​​each plot into multiple plot subdivision units according to the plot subdivision granularity, and determine the application volume of biogas slurry in each plot subdivision unit according to the product of the application intensity of biogas slurry and the area of ​​each plot subdivision unit.

[0023] Step 23: Under the constraints of vehicle effective capacity and vehicle remaining capacity, load the plot subdivision units in sequence, allocate plot subdivision units whose biogas slurry application volume does not exceed the vehicle remaining capacity to the vehicle and update the corresponding vehicle remaining capacity, and generate the vehicle loading table.

[0024] Step 24: Calculate the time difference between the end time of the service time window of the land parcel segmentation unit and the current time. Calculate the weighted sum of the reciprocal of the time difference, the transportation distance, and the ratio of the land parcel biogas slurry application volume to the corresponding vehicle capacity of the land parcel segmentation unit to obtain the sorting weight of the land parcel segmentation unit. Generate a scheduling order table according to the sorting weight and write the scheduling order table into the scheduling lock.

[0025] Further, acidification and mixing are completed according to the batch acidification dosage, and the pH is checked to the target pH according to the allowable deviation. Outbound weighing and volume verification are performed to generate an outbound measurement slip, and shipments are made according to the scheduling sequence, including:

[0026] Step 31: Acidify and mix according to the batch acidification dosage, calculate the absolute difference between the current pH and the target pH. If the absolute difference does not exceed the allowable pH deviation, it is determined to meet the standard. If it does not meet the standard, calculate the difference between the target pH and the current pH, multiply the difference by the acidification coefficient and the sum of the total biogas slurry application volume of all plots to obtain the compensation acidification dosage and add it.

[0027] Step 32: Perform outbound weighing and volume verification. Convert the weighed mass into volume and compare it with the cumulative volume of the flow meter. If the difference does not exceed the allowable deviation of the outbound volume, it is fixed as the outbound volume and combined with the outbound ammonia nitrogen concentration to form an outbound metering slip.

[0028] Step 33: Ship according to the scheduling sequence table, bind the batch number to the train number, plot division unit and outbound volume in the outbound metering sheet and outbound ammonia nitrogen concentration, generate a shipping instruction and write it into the scheduling lock.

[0029] Furthermore, the ammonia nitrogen concentration and pH level were retested on-site and compared with the prescription parameter list. If they matched, the on-site execution parameters were set to read-only, including:

[0030] Step 41: Read the current entry in the scheduling sequence table, verify whether the current time falls within the service time window, and establish the arrival binding of batch number, train number and land parcel division unit;

[0031] Step 42: Collect the pH and ammonia nitrogen concentrations from the on-site retest, calculate the difference between the pH from the on-site retest and the target pH in the prescription parameter list, and the difference between the ammonia nitrogen concentration from the on-site retest and the outbound ammonia nitrogen concentration in the outbound metering sheet. The absolute values ​​of the two differences shall not exceed the allowable deviations for pH and concentration, respectively.

[0032] Step 43: Verify the consistency between the locked application process parameters and the on-site equipment settings. Calculate the on-site execution speed using the working pump flow rate as the numerator and the product of the biogas slurry application intensity and effective working width as the denominator. Combine this with the nozzle specifications and injection depth to form the on-site execution parameters.

[0033] Step 44: When both differences in step 42 are satisfied and the consistency check in step 43 is passed, set the field execution parameters to read-only and release the process.

[0034] Furthermore, application is carried out according to the prescription parameter list, at a constant travel speed, and the volume of soil entering the machine is reconciled using dual-track metering. If the difference exceeds the allowable volume deviation, the machine is stopped and the fault type is recorded, including:

[0035] Step 51: Read the set speed from the prescription parameter list and the on-site execution parameters, collect the actual on-site speed, calculate the difference between the two, and ensure that the absolute value of the difference does not exceed the speed allowable deviation; if it does, adjust the traction and pump speed by a fixed increment or decrement until the requirement is met, and maintain a constant driving speed.

[0036] Step 52: Accumulate the mileage during the operation, multiply the accumulated mileage by the effective operating width, and then multiply by the biogas slurry application intensity of the plot to obtain the geometrically measured volume of soil penetration.

[0037] Step 53: Collect the instantaneous flow rate and accumulate it in chronological order to obtain the volume of soil entering the soil measured by the flow meter;

[0038] Step 54: Calculate the absolute value of the difference between the soil inlet volume measured by the geometric meter and the soil inlet volume measured by the flow meter, and compare it with the allowable deviation of the dual-track volume. If it does not exceed the allowable deviation of the dual-track volume, record the release. If it exceeds the allowable deviation of the dual-track volume, stop the machine and determine the fault type according to the sign of the difference. Fault types include: leakage and metering inaccuracy.

[0039] Furthermore, zero-flow and end-of-line calibration of the flow meter is performed before and after operation, including:

[0040] Step 61: Before starting the operation, turn off the nozzle and stop the pump, read the cumulative volume of the flow meter and record it as the cumulative volume baseline reading; calculate the difference between the cumulative volume baseline reading and the zero baseline value. If the absolute value of the difference does not exceed the allowable deviation of the zero flow volume, the zero flow calibration before the operation is deemed qualified.

[0041] Step 62: After the operation is completed, turn off the nozzle and stop the pump. Continuously read the cumulative volume of the flow meter within the preset time window, calculate the cumulative volume increment within the time window, compare the cumulative volume increment with the volume allowable deviation, and if the absolute value of the difference does not exceed the zero flow volume allowable deviation, the end-point calibration is deemed qualified.

[0042] Step 63: If either of the two comparison results in Step 61 and Step 62 is not satisfied, mark the reconciliation as failed, automatically generate a maintenance work order, and bind and record the unsatisfied item, the cumulative volume baseline reading, the comparison results of the cumulative volume increment and the volume allowable deviation, along with the batch number, vehicle number and plot division unit.

[0043] Furthermore, based on the outbound measurement sheet, dual-track measurement, and on-site measurement, the calculable loss rate is determined and compared with the summarized allowable loss rate and volume allowable deviation. Corrective actions are taken based on the comparison results, and the prescription achievement rate, time window achievement rate, and loss control rate are calculated, including:

[0044] Step 71: Based on the outbound metering slip and dual-track metering, calculate the absolute difference between the geometric metering volume and the flow metering volume, use it as the dual-track volume difference, and compare it with the allowable deviation of the dual-track volume. If it does not exceed the allowable deviation of the dual-track volume, determine the flow metering volume as the final volume; if it exceeds the allowable deviation of the dual-track volume, mark the reconciliation as failed.

[0045] Step 72: The product of the outgoing ammonia nitrogen concentration and the outgoing volume is taken as the outgoing nitrogen quantity. The product of the on-site retested ammonia nitrogen concentration, the soil-entry volume, and the nitrogen utilization efficiency is taken as the soil-entry effective nitrogen quantity. The ratio of the soil-entry effective nitrogen quantity to the outgoing nitrogen quantity is calculated, and the ratio is subtracted from 1 to obtain the calculable loss rate.

[0046] Step 73: When the calculable loss rate does not exceed the total allowable loss rate and the difference in the volume between the two tracks does not exceed the allowable deviation of the volume between the two tracks, it is recorded as qualified; otherwise, it is recorded as unqualified.

[0047] Step 74: Calculate the prescription achievement rate based on the soil volume that has been reconciled and the plot prescription volume in the prescription parameter list; calculate the time window achievement rate based on the service time window and the actual completed area; calculate the loss control rate by subtracting the calculable loss rate from 1; generate a settlement record by combining the prescription achievement rate, time window achievement rate, loss control rate and status, and bind it to the batch number for archiving; wherein the status includes qualified and unqualified in step 73.

[0048] This invention provides a biogas slurry resource utilization operation and maintenance service management system, including:

[0049] The account establishment and gap module is used to generate batch numbers and collect batch measured data, establish basic information of land parcels, and determine the nitrogen gap of land parcels based on the nitrogen target value and the current available nitrogen amount in the basic information of land parcels.

[0050] The prescription and process module is used to call the fixed process parameter table, determine the application volume and intensity of biogas slurry for the plot based on the batch measured data and the plot nitrogen deficit, determine the batch acidification dosage, select the locked application process parameters, and form a prescription parameter list.

[0051] The loading and scheduling module is used to load vehicles under the constraints of vehicle capacity and safety margin, and to divide the land into plots at the granularity of land division; calculate the sorting weight, generate the scheduling order table and write it into the scheduling lock;

[0052] The acidification quality control and shipping module is used to complete acidification and mixing according to the batch acidification dosage, check to the target pH according to the allowable pH deviation, generate outbound measurement sheet by weighing and volume verification, and ship according to the scheduling sequence.

[0053] The on-site retesting interlocking module is used to retest the ammonia nitrogen concentration and pH level on-site and check them against the prescription parameter list. When the check matches, the on-site execution parameters are set to read-only.

[0054] The application execution reconciliation module is used to implement the application according to the prescription parameter list, execute it at a constant driving speed, and use dual-track metering to reconcile the soil volume. When the difference exceeds the allowable volume deviation, the machine stops and the fault type is recorded.

[0055] The accounting, correction and settlement module is used to determine the calculable loss rate based on the outbound measurement sheet, dual-track measurement and on-site measurement, and compare it with the summarized allowable loss rate and volume allowable deviation. Based on the comparison results, it performs corrections and calculates the prescription achievement rate, time window achievement rate and loss control rate.

[0056] The beneficial effects of this invention are as follows: By using batch numbers to connect account setup, prescription parameter lists, scheduling locks, outbound metering slips, and dual-track metering and settlement archiving, a unified and traceable data mainline is established, reducing the drift caused by manual intervention; by fixing process parameter tables and locking application process parameters, the application volume and intensity of biogas slurry at the site are aligned with on-site execution parameters, improving application consistency; by combining service time windows with vehicle capacity and safety margin constraints, a deterministic loading and execution sequence is formed, reducing waiting and round trips; by using dual-threshold quality control of pH tolerance deviation and dual-track volume tolerance deviation, combined with zero-flow and end-point calibration of flow meters, metering reliability is improved; and by using a qualified correction branch centered on calculable loss rate, and outputting prescription achievement rate, time window achievement rate, and loss control rate, transparency and standardization of settlement and review are supported, comprehensively improving the efficiency, stability, and regulatory capacity of biogas slurry resource utilization. Attached Figure Description

[0057] Figure 1 This is a flowchart of the biogas slurry resource utilization operation and maintenance service management method of the present invention. Detailed Implementation

[0058] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0059] like Figure 1 As shown, the operation and maintenance service management method for biogas slurry resource utilization includes the following steps:

[0060] Step 1: Generate batch number and collect batch measured data to establish basic information of the land parcel. Based on the nitrogen target value in the basic information of the land parcel and the current available nitrogen amount, determine the nitrogen gap of the land parcel.

[0061] Step 2: Call the fixed process parameter table, determine the application volume and intensity of biogas slurry for the plot based on the batch measured data and the plot nitrogen deficit, determine the batch acidification dosage, select the locked application process parameters, and form a prescription parameter list;

[0062] Step 3: Loading is carried out under the constraints of vehicle capacity and safety margin, and the land is divided according to the granularity of land parcel division; the sorting weight is calculated, the scheduling order table is generated and written into the scheduling lock;

[0063] Step 4: Complete acidification and mixing according to the batch acidification dosage, check to the target pH according to the allowable pH deviation, weigh and verify the volume before leaving the warehouse to generate the outbound measurement sheet, and ship according to the scheduling sequence.

[0064] Step 5: On-site retesting of ammonia nitrogen concentration and pH, and verification against the prescription parameter list. If they match, set the on-site execution parameters to read-only.

[0065] Step 6: Apply the medication according to the prescription parameter list, at a constant driving speed, and use dual-track metering to reconcile the volume of the soil entering the machine. If the difference exceeds the allowable deviation of the volume, stop the machine and record the fault type.

[0066] Step 7: Determine the calculable loss rate based on the outbound measurement sheet, dual-track measurement, and on-site measurement, and compare it with the summarized allowable loss rate and volume allowable deviation. Correct the deviation based on the comparison results, and calculate the prescription achievement rate, time window achievement rate, and loss control rate.

[0067] In one embodiment of the present invention, the batch measured data includes ammonia nitrogen concentration, initial pH, and total volume of batch biogas slurry; the basic land information includes land area, nitrogen target value, current available nitrogen amount, and service time window; the initial pH is the pH value of the biogas slurry before any acidification treatment; the total volume of batch biogas slurry is the total volume of biogas slurry in this batch that can be used for external transportation and application; after completing the batch accounting, the basic land information of the land to be served is established, the land area is the actual application area of ​​the land; the nitrogen target value is the nitrogen intensity target planned to be supplemented for the land during this service cycle; the current available nitrogen amount is the nitrogen intensity of the land that can be absorbed and utilized by crops at this service time; the service time window is the start and end time period during which operation and maintenance services are allowed to be performed.

[0068] The difference between the target nitrogen value and the current available nitrogen amount for a plot is calculated to obtain the plot's nitrogen deficit, representing the amount of nitrogen intensity that the plot still needs to replenish in this batch. Based on the batch number, the plot's nitrogen deficit, area, and service time window are bound together to generate a batch plot binding table. This table uses the batch number as the primary key and the plot identifier as the foreign key, retaining only records where the plot's nitrogen deficit is greater than zero and marking them as pending prescription. This filtering strategy reduces invalid order assignments and round-trip operations, minimizes losses and unnecessary workload during biogas slurry transportation, and improves the efficiency and consistency of biogas slurry resource utilization operation and maintenance management.

[0069] In one embodiment of the present invention, a fixed process parameter table is invoked, and the application volume and intensity of biogas slurry for the plot are determined based on batch measured data and plot nitrogen deficit. The batch acidification dosage is then determined, and locked application process parameters are selected to form a prescription parameter list, including:

[0070] Step 11: Using the product of the plot's nitrogen deficit and the plot's area as the numerator, subtract the total allowable loss rate from the fixed process parameter table from 1 to obtain the effective retention rate. Using the product of the effective retention rate, ammonia nitrogen concentration, and nitrogen use efficiency as the denominator, obtain the application volume of biogas slurry for each plot. The fixed process parameter table includes nitrogen use efficiency, total allowable loss rate, acidification coefficient, target pH, pH tolerance, and process selection threshold. Nitrogen use efficiency represents the proportion that can be absorbed and utilized by crops after being applied to the soil. The total allowable loss rate represents the upper limit of the overall loss allowed from the time of application to the time of application. The process selection threshold is used to deterministically allocate different application processes in terms of prescription intensity.

[0071] Step 12: Calculate the ratio of the applied biogas slurry volume to the plot area to obtain the applied biogas slurry intensity. Multiply the acidification coefficient, initial pH, target pH, and the sum of the applied biogas slurry volumes of all plots to obtain the batch acidification dose.

[0072] Step 13: Select and lock the application process parameters based on the comparison results between the biogas slurry application intensity and the process selection threshold. Application process parameters may include: application method, injection depth, nozzle specifications, effective operating width, operating pump flow rate, nozzle opening and closing logic, etc. Application methods include strip application (for low-intensity matching) and shallow injection (for high-intensity matching). When the biogas slurry application intensity does not exceed the process selection threshold, select the set of application process parameters matching the low-intensity setting. For example, set the injection depth to zero or near zero, nozzle specifications and nozzle spacing matching strip spraying, the corresponding effective operating width, a suitable operating pump flow rate, a driving speed allowance zone and speed allowance deviation constructed around the on-site execution speed, and nozzle opening / closing logic related to boundary termination. Closed logic; when the application intensity of biogas slurry in a given plot exceeds the process selection threshold, a set of application process parameters matching the high intensity is selected. For example, the injection depth within a preset range, the nozzle specifications and nozzle spacing matching the injection operation, the corresponding effective operating width, the operating pump flow rate matching the injection resistance, the allowable speed range and allowable speed deviation, and the nozzle opening and closing logic of the injection section are specified; the parameters are locked to a read-only state to prevent arbitrary changes in subsequent stages, so as to ensure the consistency of prescription parameters in scheduling, warehousing, arrival and execution; the application volume of biogas slurry in the plot, the application intensity of biogas slurry in the plot, the locked application process parameters and the service time window are summarized, along with the batch acidification dose, target pH, and allowable pH deviation to generate a prescription parameter list.

[0073] This embodiment calculates the application volume and intensity of biogas slurry for a plot to achieve a deterministic match between the plot's nitrogen deficit, plot area, ammonia nitrogen concentration, effective retention rate, and nitrogen utilization efficiency. By determining the batch acidification dosage based on the initial and target pH levels and the sum of the application volumes of biogas slurry for all plots, and locking the application process parameters according to the process selection threshold, a unified pH threshold and unique execution constraint can be formed for both outbound and on-site operations, improving the consistency, traceability, and settlement accuracy of biogas slurry resource utilization operation and maintenance service management.

[0074] In one embodiment of the present invention, loading is performed under constraints of vehicle capacity and safety margin, and the land is divided at the plot segmentation granularity; the sorting weight is calculated, a scheduling order table is generated, and written into the scheduling lock, including:

[0075] Step 21: Combine vehicle capacity with safety margin to determine the effective capacity of each vehicle, and initialize the remaining capacity of each vehicle to the corresponding effective capacity. Generate a set of plots to be served based on plots with a biogas slurry application volume greater than zero. Safety margin is the proportion reserved in theoretical loading to meet transportation and operation safety. The effective capacity of the vehicle obtained by combining vehicle capacity and safety margin is used as the upper limit of subsequent loading capacity. The remaining capacity of the vehicle is the available capacity that each vehicle can continue to load in the current trip.

[0076] Step 22: Divide the area of ​​each plot into multiple plot subdivision units according to the plot subdivision granularity, and determine the application volume of biogas slurry in each plot subdivision unit according to the product of the application intensity of biogas slurry and the area of ​​each plot subdivision unit, so as to keep the prescription intensity unchanged before and after subdivision.

[0077] Step 23: Under the constraints of vehicle effective capacity and vehicle remaining capacity, the land parcel division units are loaded sequentially. Land parcel division units whose biogas slurry application volume does not exceed the vehicle's remaining capacity are allocated to the vehicle and the corresponding vehicle's remaining capacity is updated, generating a vehicle loading table; otherwise, the system switches to the next available vehicle or starts the next vehicle to continue loading until all land parcel division units are allocated; the vehicle loading table includes, but is not limited to, vehicle identifier, land parcel division unit identifier, and corresponding land parcel biogas slurry application volume;

[0078] Step 24: Calculate the time difference between the end time of the service time window of the land parcel segmentation unit and the current time. Calculate the weighted sum of the reciprocal of the time difference, the transportation distance, and the ratio of the land parcel biogas slurry application volume to the corresponding vehicle capacity of the land parcel segmentation unit to obtain the sorting weight of the land parcel segmentation unit. Generate a scheduling order table according to the sorting weight and write the scheduling order table into the scheduling lock to prevent subsequent steps from modifying the execution order.

[0079] By introducing effective vehicle capacity and remaining vehicle capacity at the batch level and combining them with the granularity of land parcel segmentation, consistent loading of prescription intensity and loading capacity is achieved. By calculating the sorting weight based on the urgency of service time window, transportation distance and loading matching degree, a unique and interpretable execution sequence can be formed. Finally, the scheduling sequence table is written into the scheduling lock and solidified with the version number, connecting the subsequent outbound and shipping links, thereby improving the scheduling determinism, execution consistency and process traceability of the "biogas slurry resource utilization operation and maintenance service management method and system".

[0080] In one embodiment of the present invention, acidification and mixing are completed according to the batch acidification dosage, the pH is checked to the target pH according to the allowable pH deviation, the outbound weighing and volume verification are performed to generate an outbound measurement slip, and the shipment is carried out according to the scheduling sequence, including:

[0081] Step 31: Acidify and mix the batch of biogas slurry according to the batch acidification dosage, calculate the absolute difference between the current pH and the target pH. If the absolute difference does not exceed the allowable pH deviation, it is determined to meet the standard. If it does not meet the standard, calculate the difference between the target pH and the current pH, multiply the difference by the acidification coefficient and the sum of the biogas slurry application volumes of all plots to obtain the compensation acidification dosage, and add it. Then mix and retest until the allowable pH deviation is met.

[0082] Step 32: After the pH criterion is met, perform outbound weighing and volume verification. Convert the weighed mass into volume and compare it with the cumulative volume of the flow meter. If the difference does not exceed the allowable deviation of the outbound volume, it is fixed as the outbound volume and formed with the outbound ammonia nitrogen concentration to form an outbound metering sheet. If the difference exceeds the allowable deviation of the outbound volume, re-inspect and re-measure according to the equipment verification process and then measure again.

[0083] Step 33: After generating the outbound metering order, the shipment is dispatched according to the scheduling sequence table. The batch number is bound to the vehicle number, the plot division unit, the outbound volume in the outbound metering order, and the outbound ammonia nitrogen concentration. A shipment instruction is generated and written into the scheduling lock to prevent subsequent steps from arbitrarily changing the execution order.

[0084] This embodiment achieves batch-level pH consistency control by linking the addition of batch acidification dosage with closed-loop verification of pH tolerance deviation; by converting the volume to the weighed mass and comparing it with the cumulative volume of the flow meter, a dual-source consistency verification can be formed on the outbound side and a unique outbound metering slip can be generated, which improves the system's quality control consistency, process traceability and the certainty of shipment execution.

[0085] In one embodiment of the present invention, the ammonia nitrogen concentration and pH are retested on-site and compared with the prescription parameter list. If the comparison is consistent, the on-site execution parameters are set to read-only, including:

[0086] Step 41: Read the current entry in the scheduling sequence table and verify whether the current time falls within the service time window. If the current time falls within the service time window, the system establishes a binding between the batch number, train number, and land parcel division unit.

[0087] Step 42: Collect the pH and ammonia nitrogen concentration from the on-site retest, calculate the difference between the pH from the on-site retest and the target pH in the prescription parameter list, and the difference between the ammonia nitrogen concentration from the on-site retest and the outbound ammonia nitrogen concentration in the outbound metering slip. The absolute values ​​of the two differences shall not exceed the allowable deviations for pH and concentration, respectively. The target pH comes from the prescription parameter list; the outbound ammonia nitrogen concentration comes from the outbound metering slip. The system writes the judgment results of the two comparisons into the on-site record as input for subsequent release judgment.

[0088] Step 43: Verify the consistency between the locked application process parameters and the on-site equipment settings. Calculate the on-site execution speed using the operating pump flow rate as the numerator and the product of the biogas slurry application intensity and the effective operating width as the denominator. Combine this with the nozzle specifications and injection depth to form the on-site execution parameters. The operating pump flow rate is the rated volumetric flow rate parameter on the equipment side, and the effective operating width is the effective width of the spray pattern projected onto the ground.

[0089] Step 44: When both differences in Step 42 are satisfied and the consistency check in Step 43 is passed, set the on-site execution parameters to read-only and release; otherwise, if the pH is not satisfied, return to the acidification and mixing stage to perform compensatory acidification and retesting; if the ammonia nitrogen concentration is not satisfied or the consistency check is not passed, return to the prescription calculation and process lockout stage.

[0090] This embodiment achieves consistency verification of pH and ammonia nitrogen concentration on the on-site side by binding on-site based on service time windows and comparing two differences; by calculating the on-site execution speed using the deterministic ratio of the working pump flow rate to the application intensity of biogas slurry and the effective working width, and jointly verifying it with the locked application process parameters, unique and tamper-proof on-site execution parameters can be formed, thereby improving the on-site consistency, execution controllability and data traceability of the present invention.

[0091] In one embodiment of the present invention, administration is carried out according to a prescription parameter list, at a constant travel speed, and dual-track metering is used to reconcile the volume of soil entering the machine. If the difference exceeds the allowable volume deviation, the machine is stopped and the fault type is recorded, including:

[0092] Step 51: Read the set speed from the prescription parameter list and the on-site execution parameters, collect the actual on-site speed, calculate the difference between the two, and the absolute value of the difference shall not exceed the speed allowable deviation; if it exceeds, adjust the traction and pump speed by a fixed increment or decrement until the requirement is met, and record the adjustment trajectory to maintain a constant driving speed; the fixed increment or decrement is the speed step constant used for closed-loop speed regulation.

[0093] Step 52: Accumulate the mileage during the operation, multiply the accumulated mileage by the effective operating width, and then multiply by the biogas slurry application intensity of the plot to obtain the geometrically measured soil volume; the mileage is obtained by speed integration, and the effective operating width corresponds one-to-one with the nozzle arrangement.

[0094] Step 53: Collect instantaneous flow rate and accumulate it in chronological order to obtain the soil ingress volume measured by the flow meter; to ensure measurement stability, the system performs volume accumulation after pulse de-jittering and time synchronization, and aligns it with the sampling time window of geometric measurement to ensure consistency of reconciliation time period;

[0095] Step 54: Calculate the absolute value of the difference between the soil inlet volume measured by the geometric meter and the soil inlet volume measured by the flow meter, and compare it with the allowable deviation of the dual-track volume. If it does not exceed the allowable deviation of the dual-track volume, record the release and solidify the soil inlet volume within this time window. If it exceeds the allowable deviation of the dual-track volume, stop the machine and determine the fault type according to the sign of the difference. Specifically, if the soil inlet volume measured by the flow meter is greater than the soil inlet volume measured by the geometric meter, it is determined to be a leak. If the soil inlet volume measured by the flow meter is less than the soil inlet volume measured by the geometric meter, it is determined to be a metering inaccuracy.

[0096] This embodiment achieves constant driving speed control by comparing the set speed with the actual measured speed on site in a closed loop and adjusting the traction and pump speed by a fixed increment or decrement. By accumulating the data in parallel through the geometric metering and flow metering channels, the volume of soil entering the ground can be checked from two sources and a unique release threshold can be formed by the allowable deviation of the dual-track volume, which improves the consistency of the system's execution, the reliability of metering, and the traceability of the process.

[0097] In one embodiment of the present invention, zero flow and end-point verification of the flow meter before and after operation includes:

[0098] Step 61: Before starting the operation, close the nozzle and stop the pump, read the cumulative volume of the flow meter, and record it as the cumulative volume baseline reading; calculate the difference between the cumulative volume baseline reading and the zero baseline value. If the absolute value of the difference does not exceed the zero flow volume allowable deviation, the zero flow verification before the operation is deemed qualified. If it exceeds the allowable deviation, it is considered that there is static drift, and the operation will not be allowed during subsequent reconciliation and the maintenance process will be triggered; the zero baseline value represents the cumulative volume reference reading verified and confirmed in the zero flow state with the nozzle closed and the pump stopped; the zero flow volume allowable deviation is the judgment threshold for zero flow verification;

[0099] Step 62: After the operation is completed, turn off the nozzle and stop the pump. Continuously read the cumulative volume of the flow meter within the preset time window, calculate the cumulative volume increment within the time window, and compare the cumulative volume increment with the volume allowable deviation. If the absolute value of the difference does not exceed the zero flow volume allowable deviation, the end-point calibration is deemed qualified; if it exceeds, it indicates that there is residual leakage or static metering drift at the end of the operation, and the operation will not be released and will enter the maintenance process.

[0100] Step 63: If either of the two comparison results in Step 61 and Step 62 is not satisfied, mark the reconciliation as failed, automatically generate a maintenance work order, and bind and record the unsatisfied item, the cumulative volume baseline reading, the comparison results of the cumulative volume increment and the volume allowable deviation, along with the batch number, vehicle number and plot division unit.

[0101] This embodiment confirms the static baseline of the flow meter and intercepts drift by performing zero-flow verification before the start of the operation; and by performing end-of-line verification after the operation, it can detect short-term leakage and static drift and form read-only evidence, thereby improving the metering reliability, process traceability and certainty of anomaly handling of the system.

[0102] In one embodiment of the present invention, the calculable loss rate is determined based on the outbound measurement sheet, dual-track measurement, and on-site measurement, and compared with the summarized allowable loss rate and volume allowable deviation. Corrective actions are taken based on the comparison results, and the prescription achievement rate, time window achievement rate, and loss control rate are calculated, including:

[0103] Step 71: Based on the outbound metering slip and dual-track metering, calculate the absolute difference between the geometric metering volume and the flow metering volume, using this as the dual-track volume difference. Compare this difference with the allowable deviation of the dual-track volume. If the difference does not exceed the allowable deviation, the reconciliation is confirmed as successful, and the flow metering volume is determined as the final volume. If the difference exceeds the allowable deviation, the reconciliation is marked as unsuccessful, and subsequent calculations are suspended. To ensure consistency, the calculation of the dual-track volume difference must be completed within the same sampling time window corresponding to the construction operation, and the equipment identification and timestamp must be recorded.

[0104] Step 72: The product of the outgoing ammonia nitrogen concentration and the outgoing volume is taken as the outgoing nitrogen quantity. The product of the on-site retested ammonia nitrogen concentration, the soil-entry volume, and the nitrogen utilization efficiency is taken as the soil-entry effective nitrogen quantity. The ratio of the soil-entry effective nitrogen quantity to the outgoing nitrogen quantity is calculated, and the ratio is subtracted from 1 to obtain the calculable loss rate. This rate is used to quantify the difference in nitrogen loss from the outgoing nitrogen quantity to the soil-entry effective nitrogen quantity at the batch level, and is used as a basis for comparison with the summary allowable loss rate to determine whether it is qualified or corrective.

[0105] Step 73: When the calculable loss rate does not exceed the total allowable loss rate and the difference in volume between the two tracks does not exceed the allowable deviation of the volume between the two tracks, it is recorded as qualified; otherwise, it is considered unqualified. Corrective actions are generated according to deterministic rules and written into the correction log, including: generating prescription recalculation, referencing the latest on-site retested pH, on-site retested ammonia nitrogen concentration and final soil-entry volume during recalculation, and updating the version number of the prescription parameter list; based on the comparison between the process selection threshold and the current prescription intensity, executing the application process switch and synchronously updating the referenced version of the on-site execution parameters; combining the difference sign from the reconciliation stage and the equipment self-inspection record, generating a maintenance work order for leak detection or calibration.

[0106] Step 74: Calculate the prescription achievement rate based on the reconciled soil volume and the prescription volume of the plot in the prescription parameter list. This is used to measure the degree of completion of the reconciled soil volume relative to the prescription volume and serves as the settlement caliber for execution completion. Calculate the time window achievement rate based on the service time window and the actual completed area. This is used to measure the completion ratio of the actual completed area within its respective service time window and serves as an evaluation indicator for timeliness. Calculate the loss control rate by subtracting the calculable loss rate from 1. This is used to reflect the level of loss suppression and serves as a reference indicator for quality control and settlement weighting. Generate a settlement record by combining the prescription achievement rate, time window achievement rate, loss control rate, and status, and bind it to the batch number for archiving. The status includes qualified and unqualified as described in Step 73.

[0107] This embodiment achieves unique determination and reconciliation release of the soil-entry volume by comparing the difference between the two-track volume and the allowable deviation of the two-track volume; it calculates the loss rate by using the ratio of the nitrogen output to the effective nitrogen output and links it with the summary allowable loss rate, which enables the formation of deterministic qualified correction branches at the batch level and generates prescription recalculation, application process switching and maintenance work orders; and it completes settlement records and batch archiving by using prescription achievement degree, time window achievement degree and loss control degree, thereby improving the system's accounting accuracy, correction closed loop and full-process traceability.

[0108] This invention provides a biogas slurry resource utilization operation and maintenance service management system, including:

[0109] The account establishment and gap module is used to generate batch numbers and collect batch measured data, establish basic information of land parcels, and determine the nitrogen gap of land parcels based on the nitrogen target value and the current available nitrogen amount in the basic information of land parcels.

[0110] The prescription and process module is used to call the fixed process parameter table, determine the application volume and intensity of biogas slurry for the plot based on the batch measured data and the plot nitrogen deficit, determine the batch acidification dosage, select the locked application process parameters, and form a prescription parameter list.

[0111] The loading and scheduling module is used to load vehicles under the constraints of vehicle capacity and safety margin, and to divide the land into plots at the granularity of land division; calculate the sorting weight, generate the scheduling order table and write it into the scheduling lock;

[0112] The acidification quality control and shipping module is used to complete acidification and mixing according to the batch acidification dosage, check to the target pH according to the allowable pH deviation, generate outbound measurement sheet by weighing and volume verification, and ship according to the scheduling sequence.

[0113] The on-site retesting interlocking module is used to retest the ammonia nitrogen concentration and pH level on-site and check them against the prescription parameter list. When the check matches, the on-site execution parameters are set to read-only.

[0114] The application execution reconciliation module is used to implement the application according to the prescription parameter list, execute it at a constant driving speed, and use dual-track metering to reconcile the soil volume. When the difference exceeds the allowable volume deviation, the machine stops and the fault type is recorded.

[0115] The accounting, correction and settlement module is used to determine the calculable loss rate based on the outbound measurement sheet, dual-track measurement and on-site measurement, and compare it with the summarized allowable loss rate and volume allowable deviation. Based on the comparison results, it performs corrections and calculates the prescription achievement rate, time window achievement rate and loss control rate.

[0116] It should be noted that the interval and threshold sizes are set for ease of comparison. The size of the threshold depends on the amount of sample data and the base number set by those skilled in the art for each set of sample data, as long as it does not affect the proportional relationship between the parameter and the quantized value. Furthermore, the above formulas are all dimensionless calculations, and the formulas are derived from software simulations using a large amount of collected data to obtain the most recent real-world results. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0117] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the present embodiments, all of which are within the protection scope of the present embodiments.

Claims

1. A method for managing the operation and maintenance of biogas slurry resource utilization services, characterized in that, Includes the following steps: Step 1: Generate batch number and collect batch measured data to establish basic information of the land parcel. Based on the nitrogen target value in the basic information of the land parcel and the current available nitrogen amount, determine the nitrogen gap of the land parcel. Step 2: Call the fixed process parameter table, determine the application volume and intensity of biogas slurry for the plot based on the batch measured data and the plot nitrogen deficit, determine the batch acidification dosage, select the locked application process parameters, and form a prescription parameter list; Step 3: Loading is carried out under the constraints of vehicle capacity and safety margin, and the land is divided according to the granularity of land parcel division; the sorting weight is calculated, the scheduling order table is generated and written into the scheduling lock; Step 4: Complete acidification and mixing according to the batch acidification dosage, check to the target pH according to the allowable pH deviation, weigh and verify the volume before leaving the warehouse to generate the outbound measurement sheet, and ship according to the scheduling sequence. Step 5: On-site retesting of ammonia nitrogen concentration and pH, and verification against the prescription parameter list. If they match, set the on-site execution parameters to read-only. Step 6: Apply the medication according to the prescription parameter list, at a constant driving speed, and use dual-track metering to reconcile the volume of the soil entering the machine. If the difference exceeds the allowable deviation of the volume, stop the machine and record the fault type. Step 7: Determine the calculable loss rate based on the outbound measurement sheet, dual-track measurement, and on-site measurement, and compare it with the summarized allowable loss rate and volume allowable deviation. Correct the deviation based on the comparison results, and calculate the prescription achievement rate, time window achievement rate, and loss control rate.

2. The biogas slurry resource utilization operation and maintenance service management method according to claim 1, characterized in that, The batch measured data includes ammonia nitrogen concentration, initial pH, and total volume of batch biogas slurry; the basic information of the plot includes plot area, nitrogen target value, current available nitrogen amount, and service time window. The difference between the target nitrogen value and the current available nitrogen amount of the plot is calculated to obtain the plot's nitrogen deficit. The plot's nitrogen deficit, plot area, and service time window are bound according to the batch number to generate a batch plot binding table. The batch plot binding table only retains records with plot nitrogen deficits greater than zero and marks them as pending prescription status.

3. The biogas slurry resource utilization operation and maintenance service management method of claim 1, wherein, Determine the application volume and intensity of biogas slurry for each plot, determine the batch acidification dosage, and select the locked application process parameters to form a prescription parameter list, including: Step 11: Use the product of the plot's nitrogen deficit and the plot's area as the numerator, subtract the total allowable loss rate from the fixed process parameter table from 1 to obtain the effective retention rate, and use the product of the effective retention rate, ammonia nitrogen concentration, and nitrogen use efficiency as the denominator to obtain the plot's biogas slurry application volume; the fixed process parameter table includes nitrogen use efficiency, total allowable loss rate, acidification coefficient, target pH, pH tolerance, and process selection threshold; Step 12: Calculate the ratio of the applied biogas slurry volume to the plot area to obtain the applied biogas slurry intensity. Multiply the acidification coefficient, initial pH, target pH, and the sum of the applied biogas slurry volumes of all plots to obtain the batch acidification dose. Step 13: Select and lock the application process parameters according to the comparison results of the application intensity of biogas slurry on the plot and the process selection threshold. Summarize the application volume of biogas slurry on the plot, the application intensity of biogas slurry on the plot, the locked application process parameters and the service time window, and generate a prescription parameter list together with the batch acidification dose, target pH and pH allowable deviation.

4. The biogas slurry resource utilization operation and maintenance service management method according to claim 1, characterized in that, Loading is carried out under the constraints of vehicle capacity and safety margin, and the land is divided according to the granularity of plot division; Calculate the sorting weights, generate the scheduling order table, and write it to the scheduling lock, including: Step 21: Combine vehicle capacity with safety margin to determine the effective capacity of each vehicle, and initialize the remaining capacity of each vehicle to the corresponding effective capacity. Generate a set of plots to be served based on plots with a biogas slurry application volume greater than zero. Step 22: Divide the area of ​​each plot into multiple plot subdivision units according to the plot subdivision granularity, and determine the application volume of biogas slurry in each plot subdivision unit according to the product of the application intensity of biogas slurry and the area of ​​each plot subdivision unit. Step 23: Under the constraints of vehicle effective capacity and vehicle remaining capacity, load the plot subdivision units in sequence, allocate plot subdivision units whose biogas slurry application volume does not exceed the vehicle remaining capacity to the vehicle and update the corresponding vehicle remaining capacity, and generate the vehicle loading table. Step 24: Calculate the time difference between the end time of the service time window of the land parcel segmentation unit and the current time. Calculate the weighted sum of the reciprocal of the time difference, the transportation distance, and the ratio of the land parcel biogas slurry application volume to the corresponding vehicle capacity of the land parcel segmentation unit to obtain the sorting weight of the land parcel segmentation unit. Generate a scheduling order table according to the sorting weight and write the scheduling order table into the scheduling lock.

5. The biogas slurry resource utilization operation and maintenance service management method according to claim 1, characterized in that, Acidification and mixing are completed according to the batch acidification dosage. The pH is then checked against the target pH based on the allowable deviation. Upon shipment, the weight and volume are verified to generate an outbound measurement slip, and the shipment is dispatched according to the scheduling sequence. This includes: Step 31: Acidify and mix according to the batch acidification dosage, calculate the absolute difference between the current pH and the target pH. If the absolute difference does not exceed the allowable pH deviation, it is determined to meet the standard. If it does not meet the standard, calculate the difference between the target pH and the current pH, multiply the difference by the acidification coefficient and the sum of the total biogas slurry application volume of all plots to obtain the compensation acidification dosage and add it. Step 32: Perform outbound weighing and volume verification. Convert the weighed mass into volume and compare it with the cumulative volume of the flow meter. If the difference does not exceed the allowable deviation of the outbound volume, it is fixed as the outbound volume and combined with the outbound ammonia nitrogen concentration to form an outbound metering slip. Step 33: Ship according to the scheduling sequence table, bind the batch number to the train number, plot division unit and outbound volume in the outbound metering sheet and outbound ammonia nitrogen concentration, generate a shipping instruction and write it into the scheduling lock.

6. The biogas slurry resource utilization operation and maintenance service management method according to claim 1, characterized in that, Upon arrival, the ammonia nitrogen concentration and pH level were retested and compared with the prescription parameter list. If they matched, the on-site execution parameters were set to read-only, including: Step 41: Read the current entry in the scheduling sequence table, verify whether the current time falls within the service time window, and establish the arrival binding of batch number, train number and land parcel division unit; Step 42: Collect the pH and ammonia nitrogen concentrations from the on-site retest, calculate the difference between the pH from the on-site retest and the target pH in the prescription parameter list, and the difference between the ammonia nitrogen concentration from the on-site retest and the outbound ammonia nitrogen concentration in the outbound metering sheet. The absolute values ​​of the two differences shall not exceed the allowable deviations for pH and concentration, respectively. Step 43: Verify the consistency between the locked application process parameters and the on-site equipment settings. Calculate the on-site execution speed using the working pump flow rate as the numerator and the product of the biogas slurry application intensity and effective working width as the denominator. Combine this with the nozzle specifications and injection depth to form the on-site execution parameters. Step 44: When both differences in step 42 are satisfied and the consistency check in step 43 is passed, set the field execution parameters to read-only and release the process.

7. The biogas slurry resource utilization operation and maintenance service management method according to claim 1, characterized in that, Application should be carried out according to the prescription parameter list, at a constant travel speed, and the volume of soil injected should be reconciled using dual-track metering. If the difference exceeds the allowable volume deviation, the machine should be stopped and the fault type recorded, including: Step 51: Read the set speed from the prescription parameter list and the on-site execution parameters, collect the actual on-site speed, calculate the difference between the two, and ensure that the absolute value of the difference does not exceed the speed allowable deviation; if it does, adjust the traction and pump speed by a fixed increment or decrement until the requirement is met, and maintain a constant driving speed. Step 52: Accumulate the mileage during the operation, multiply the accumulated mileage by the effective operating width, and then multiply by the biogas slurry application intensity of the plot to obtain the geometrically measured volume of soil penetration. Step 53: Collect the instantaneous flow rate and accumulate it in chronological order to obtain the volume of soil entering the soil measured by the flow meter; Step 54: Calculate the absolute value of the difference between the soil inlet volume measured by the geometric meter and the soil inlet volume measured by the flow meter, and compare it with the allowable deviation of the dual-track volume. If it does not exceed the allowable deviation of the dual-track volume, record the release. If it exceeds the allowable deviation of the dual-track volume, stop the machine and determine the fault type according to the sign of the difference. Fault types include: leakage and metering inaccuracy.

8. The biogas slurry resource utilization operation and maintenance service management method according to claim 7, characterized in that, Zero flow and end-point calibration of the flow meter before and after operation includes: Step 61: Before starting the operation, turn off the nozzle and stop the pump, read the cumulative volume of the flow meter and record it as the cumulative volume baseline reading; calculate the difference between the cumulative volume baseline reading and the zero baseline value. If the absolute value of the difference does not exceed the allowable deviation of the zero flow volume, the zero flow calibration before the operation is deemed qualified. Step 62: After the operation is completed, turn off the nozzle and stop the pump. Continuously read the cumulative volume of the flow meter within the preset time window, calculate the cumulative volume increment within the time window, compare the cumulative volume increment with the volume allowable deviation, and if the absolute value of the difference does not exceed the zero flow volume allowable deviation, the end-point calibration is deemed qualified. Step 63: If either of the two comparison results in Step 61 and Step 62 is not satisfied, mark the reconciliation as failed, automatically generate a maintenance work order, and bind and record the unsatisfied item, the cumulative volume baseline reading, the comparison results of the cumulative volume increment and the volume allowable deviation, along with the batch number, vehicle number and plot division unit.

9. The biogas slurry resource utilization operation and maintenance service management method according to claim 1, characterized in that, The calculable loss rate is determined based on the outbound measurement sheet, dual-track measurement, and on-site measurement. This rate is then compared with the summarized allowable loss rate and volume tolerance. Corrective actions are taken based on the comparison results, and prescription achievement rate, time window achievement rate, and loss control rate are calculated, including: Step 71: Based on the outbound metering slip and dual-track metering, calculate the absolute difference between the geometric metering volume and the flow metering volume, use it as the dual-track volume difference, and compare it with the allowable deviation of the dual-track volume. If it does not exceed the allowable deviation of the dual-track volume, determine the flow metering volume as the final volume; if it exceeds the allowable deviation of the dual-track volume, mark the reconciliation as failed. Step 72: The product of the outgoing ammonia nitrogen concentration and the outgoing volume is taken as the outgoing nitrogen quantity. The product of the on-site retested ammonia nitrogen concentration, the soil-entry volume, and the nitrogen utilization efficiency is taken as the soil-entry effective nitrogen quantity. The ratio of the soil-entry effective nitrogen quantity to the outgoing nitrogen quantity is calculated, and the ratio is subtracted from 1 to obtain the calculable loss rate. Step 73: When the calculable loss rate does not exceed the total allowable loss rate and the difference in the volume between the two tracks does not exceed the allowable deviation of the volume between the two tracks, it is recorded as qualified; otherwise, it is recorded as unqualified. Step 74: Calculate the prescription achievement rate based on the soil volume that has been reconciled and the plot prescription volume in the prescription parameter list; calculate the time window achievement rate based on the service time window and the actual completed area; calculate the loss control rate by subtracting the calculable loss rate from 1; generate a settlement record by combining the prescription achievement rate, time window achievement rate, loss control rate and status, and bind it to the batch number for archiving; wherein the status includes qualified and unqualified in step 73.

10. A management system for operation and maintenance of resource utilization of biogas slurry, characterized in that, The method for operation and maintenance service management of biogas slurry resource utilization as described in any one of claims 1-9 includes: The account establishment and gap module is used to generate batch numbers and collect batch measured data, establish basic information of land parcels, and determine the nitrogen gap of land parcels based on the nitrogen target value and the current available nitrogen amount in the basic information of land parcels. The prescription and process module is used to call the fixed process parameter table, determine the application volume and intensity of biogas slurry for the plot based on the batch measured data and the plot nitrogen deficit, determine the batch acidification dosage, select the locked application process parameters, and form a prescription parameter list. The loading and scheduling module is used to load vehicles under the constraints of vehicle capacity and safety margin, and to divide the land into plots at the granularity of land division; calculate the sorting weight, generate the scheduling order table and write it into the scheduling lock; The acidification quality control and shipping module is used to complete acidification and mixing according to the batch acidification dosage, check to the target pH according to the allowable pH deviation, generate outbound measurement sheet by weighing and volume verification, and ship according to the scheduling sequence. The on-site retesting interlocking module is used to retest the ammonia nitrogen concentration and pH level on-site and check them against the prescription parameter list. When the check matches, the on-site execution parameters are set to read-only. The application execution reconciliation module is used to implement the application according to the prescription parameter list, execute it at a constant driving speed, and use dual-track metering to reconcile the soil volume. When the difference exceeds the allowable volume deviation, the machine stops and the fault type is recorded. The accounting, correction and settlement module is used to determine the calculable loss rate based on the outbound measurement sheet, dual-track measurement and on-site measurement, and compare it with the summarized allowable loss rate and volume allowable deviation. Based on the comparison results, it performs corrections and calculates the prescription achievement rate, time window achievement rate and loss control rate.

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