Automatic sample quality control system and method for online detection of ash content of ore pulp

Abstract

The invention discloses an ore pulp ash content online detection sample quality automatic control system and method in the technical field of ore pulp ash content online detection, and the method comprises the steps: setting an ore pulp sampling volume reference value and a threshold range, and obtaining an ore pulp flow feedback value and a sample thickness fed back by a cake pressing device; controlling the ore pulp sampling volume within a threshold range according to the ore pulp flow feedback value, and adjusting the ore pulp sampling volume reference value according to the sample thickness fed back by the cake pressing device; setting a hot air temperature value and a pressure value in ore pulp sampling, obtaining feedback of a temperature sensor and a pressure sensor in the ore pulp sampling, and adjusting the temperature value and the pressure value according to the feedback of the temperature sensor and the pressure sensor; setting a moisture value after the coal sample is dried, obtaining a humidity feedback value of the coal sample, and adjusting the temperature of the heater and the drying time according to the humidity feedback value and the moisture value set value after the coal sample is dried. The requirements of the X-ray fluorescence ash content on the moisture and uniformity of the detected sample are met, and the precision and stability of the online ash separation system of the ore pulp ash content are improved.

Description

Technical Field

[0001] The invention relates to an automatic control system and method for online detection of slurry ash content sample quality, belonging to the technical field of online detection of slurry ash content. Background Art

[0002] Online ash content monitoring in flotation clean coal slurry is a crucial step in the coal preparation process, helping to monitor product quality in real time and optimize production. Common methods for flotation clean coal slurry ash content testing include nuclear ash analyzers, X-ray fluorescence analysis (XRF), microwave ash analysis, optical ash analysis, ultrasonic ash analysis, online chemical analysis, intelligent algorithms, and data fusion. Taking into account factors such as accuracy, equipment cost, environmental protection, and occupational health, X-ray fluorescence ash analyzers are becoming increasingly popular for online ash content monitoring in flotation clean coal slurry.

[0003] Moisture in flotation clean coal slurry absorbs some X-rays, weakening the signal and affecting the accuracy of ash content measurement. Increased moisture changes sample density, causing changes in X-ray penetration and affecting measurement accuracy. Uneven moisture distribution can lead to inconsistent sample density, further affecting measurement results. Moisture increases X-ray scattering, causing signal distortion at the detector and affecting ash content measurement. Therefore, a method for online slurry ash content sample quality control that can control sample moisture and uniformity is urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an automatic control system and method for online detection of slurry ash sample quality, which meets the requirements of X-ray fluorescence ash for detecting sample moisture and uniformity, and improves the accuracy and stability of the online slurry ash system.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] In a first aspect, the present invention provides a method for automatically controlling the quality of an online ash content detection sample in a slurry, comprising:

[0007] Set the slurry sampling volume baseline value and threshold range, obtain the slurry flow feedback value and the sample thickness feedback from the cake pressing device, control the slurry sampling volume within the threshold range according to the slurry flow feedback value, and adjust the slurry sampling volume baseline value according to the sample thickness feedback from the cake pressing device;

[0008] Set the hot air temperature and pressure values in the slurry sampling, obtain feedback from the temperature and pressure sensors in the slurry sampling, and adjust the temperature and pressure values according to the feedback from the temperature and pressure sensors;

[0009] Set the moisture value of the coal sample after drying, obtain the humidity feedback value of the coal sample, and adjust the heater temperature and drying time according to the humidity feedback value and the moisture value set value of the coal sample after drying.

[0010] Furthermore, a slurry sampling volume reference value and a threshold range are set, the slurry flow feedback value and the sample thickness fed back by the cake pressing device are obtained, the slurry sampling volume is controlled within the threshold range according to the slurry flow feedback value, and the slurry sampling volume reference value is adjusted according to the sample thickness fed back by the cake pressing device, including:

[0011] The slurry sampling volume value is set based on the empirical slurry concentration and the amount of dry coal slime required for sample preparation;

[0012] According to the real-time feedback value of flow, the sampling slurry flow is accumulated and counted;

[0013] When the slurry sampling flow rate reaches the set slurry volume value, close the feed valve;

[0014] According to the sample thickness value fed back by the cake pressing device, the set slurry sampling volume setting value is corrected.

[0015] Furthermore, the slurry sampling volume value is:

[0016] z*0.9≤x*y*t / 60≤z*1.1

[0017] V=y*t / 60

[0018] Where: V is the slurry sampling volume value, y is the instantaneous value of the slurry sampling flow rate, t is the sampling time, x is the concentration of flotation clean coal slurry obtained based on historical production experience, and z is the amount of dry coal powder required for sample preparation.

[0019] Furthermore, the cumulative statistical sampling slurry flow is:

[0020]

[0021] Where: V is the cumulative statistical sampling slurry flow, t2 is the time to close the sampling valve, t1 is the time to open the sampling valve, Q is the feedback data of the flow meter collected once per second, and t is the sampling time.

[0022] Furthermore, the corrected slurry sampling volume setting value is:

[0023] V2=k1*V1*(h-h1)

[0024] Where: V2 is the corrected slurry sampling volume setting value, k1 is the calculation coefficient, V1 is the previous slurry sampling volume setting value, h is the coal sample thickness value required by the X-ray fluorescence ash analyzer, and h1 is the coal sample thickness fed back after the cake pressing is completed.

[0025] Furthermore, the temperature and pressure values of the hot air in the slurry sampling are set, feedback from the temperature and pressure sensors in the slurry sampling is obtained, and the temperature and pressure values are adjusted according to the feedback from the temperature and pressure sensors, including:

[0026] Set the compressed air pressure value and heater temperature setting value;

[0027] Adjust the pressure valve opening according to pressure feedback;

[0028] Adjust heater temperature setpoint based on temperature feedback;

[0029] The pressure valve opening adjustment and the heater temperature setting value adjustment are both implemented using a PID control algorithm, and the expression of the PID control algorithm is:

[0030]

[0031] Where: u(t) is the output signal of the PID controller; K p is the proportional gain; e(t) is the difference between the set value and the feedback value; T t is the integration time constant; T D is the differential time constant; t is the sampling time.

[0032] Furthermore, the moisture value of the coal sample after drying is set, a humidity feedback value of the coal sample is obtained, and the heater temperature and drying time are adjusted according to the humidity feedback value and the moisture value set value of the coal sample after drying, including:

[0033] The time required to obtain a qualified sample of a certain volume of slurry under specific temperature and pressure conditions after pressure filtration and hot air drying, as well as the temperature sensor and humidity sensor values detected by the discharge pipe of the drying barrel are used as the temperature and humidity set values;

[0034] During the dosing and drying process, when the collected discharge pipe data reaches the set temperature and humidity values, the heater will stop working and the stirring will be delayed for a period of time;

[0035] The temperature and humidity setting values are automatically adjusted according to the moisture data of the coal sample after cake pressing.

[0036] In a second aspect, the present invention provides an automatic control system for online detection of slurry ash sample quality, comprising:

[0037] Sampling volume adjustment module: sets the slurry sampling volume baseline value and threshold range, obtains the slurry flow feedback value and the sample thickness feedback from the cake pressing device, controls the slurry sampling volume within the threshold range according to the slurry flow feedback value, and adjusts the slurry sampling volume baseline value according to the sample thickness feedback from the cake pressing device;

[0038] Temperature and pressure adjustment module: sets the hot air temperature and pressure values in slurry sampling, obtains feedback from the temperature and pressure sensors in slurry sampling, and adjusts the temperature and pressure values according to the feedback from the temperature and pressure sensors;

[0039] Coal sample drying adjustment module: set the moisture value of the coal sample after drying, obtain the humidity feedback value of the coal sample, and adjust the heater temperature and drying time according to the humidity feedback value and the moisture value set value of the coal sample after drying.

[0040] In a third aspect, the present invention provides an automatic quality control device for online detection of ash content in a slurry sample, comprising a processor and a storage medium;

[0041] The storage medium is used to store instructions;

[0042] The processor is configured to operate according to the instructions to execute the steps of any of the above methods.

[0043] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the above methods when executed by a processor.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] First, the present invention regulates the slurry sampling flow rate, the pressure and temperature of the compressed air, and the moisture and uniformity of the coal sample. This not only achieves the control of the sample and moisture indicators to meet the requirements of the X-ray fluorescence online ash analyzer, but also fully ensures the uniformity of the sample. The thickness of the sample after pressing is controlled through a "feedforward + feedback" control method, thereby eliminating the influence of the "uniformity" and "sample thickness" differences on the detection accuracy of the ash analyzer to the greatest extent, and effectively improving the accuracy and stability of the X-ray fluorescence online ash analyzer.

[0046] Second, this invention achieves closed-loop control of the sampling volume by constructing a bidirectional coupling analysis model between slurry flow and cake thickness. When slurry flow fluctuates or concentration changes suddenly, the synergistic effect of feedforward prediction and feedback compensation ensures that the sample thickness remains stable within the ideal range. This adaptive volume adjustment capability eliminates differences in sample bulk density at the source, providing standardized samples with consistent physical morphology for subsequent testing.

[0047] Third, this invention develops a multi-parameter collaborative control algorithm based on a quantitative analysis model of the effect of temperature-pressure gradients on coal sample porosity. By accurately calculating the dynamic relationship between hot air temperature and pressure and the material microstructure, this algorithm optimizes the conditions for maintaining stable volatile content while avoiding sample deformation caused by thermal shock. This technology overcomes the limitations of traditional single-variable heat treatment, achieving a uniform pore distribution during the drying process and significantly improving the stability of X-ray penetration depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0049] Figure 1 A schematic diagram of hardware connections for an automatic quality control method for online detection of slurry ash content provided in Example 1 of the present invention;

[0050] Figure 2 This is a general flow chart of an automatic quality control method for online detection of slurry ash content provided in Example 1 of the present invention;

[0051] Figure 3 for Figure 2 Flowchart of step S1 in FIG.

[0052] Figure 4 for Figure 2 Flowchart of step S2 in FIG.

[0053] Figure 5 for Figure 2 Flowchart of step S3 in FIG.

[0054] In the figure: 1. Pressure regulating valve; 2. Electric valve No. 1; 3. Heater; 4. Temperature sensor No. 1; 5. Pressure sensor; 6. Electric regulating valve No. 2; 7. Flow meter; 8. Electric valve No. 3; 9. Stirring motor; 10. Drying filter barrel; 11. Filter plate; 12. Discharge solenoid valve; 13. Temperature sensor No. 2; 14. Humidity sensor; 15. Electric regulating valve No. 4; 16. Cake pressing device; 17. Programmable controller; 18. Industrial computer. DETAILED DESCRIPTION

[0055] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0056] The following detailed description is an exemplary description and is intended to provide further detailed description of the present invention. Unless otherwise indicated, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0057] Example 1:

[0058] See also Figure 1 This embodiment proposes an automatic quality control solution for online ash content sample testing in slurry. The solution includes a drying and filtering drum 10 equipped with a stirring motor 9. The input of the drying and filtering drum 10 is connected to a slurry pipeline and a compressed air pipeline. The compressed air pipeline includes a pressure regulating valve 1, a No. 1 electric valve 2, a heater 3, a No. 1 temperature sensor 4, a pressure sensor 5, and a No. 2 electric regulating valve 6, which are connected in sequence. The slurry pipeline includes a flow meter 7 and a No. 3 electric valve 8, which are connected in sequence. The pressure regulating valve 1 is connected to the compressed air, the flow meter 7 is connected to the slurry, and the No. 2 electric regulating valve 6 and the No. 3 electric valve 8 are connected to the drying and filtering drum 10. The output of the drying and filtering drum 10 is connected to a discharge pipeline and a cake pressing pipeline. The discharge pipeline includes a discharge solenoid valve 12, and the cake pressing pipeline includes a No. 2 temperature sensor 13, a humidity sensor 14, a No. 4 electric regulating valve 15, and a cake pressing device 16, which are connected in sequence. All of these components are electrically connected to a programmable controller 17, which is controlled by an industrial control integrated computer 18.

[0059] Based on the above scheme, this scheme also provides a method for automatically controlling the quality of slurry ash online detection samples, such as Figure 2 As shown, it includes the regulation of slurry sampling flow, the regulation of hot air pressure and temperature, the filter press drying time, and the regulation of sample moisture, as follows:

[0060] S1. Preliminarily set the slurry sampling volume based on the dry coal powder amount and slurry concentration (empirical value) required for the sample. According to the real-time flow rate fed back by the feed flow meter, the total slurry volume of each sampling is accumulated, and then the feed valve is closed to stop sampling.

[0061] S2. Set the temperature and pressure of the hot air, and automatically adjust the opening of the pressure regulating valve and the temperature of the heater according to the feedback from the temperature sensor and pressure sensor to control the pressure and temperature within a reasonable range to ensure the stability of the subsequent filtration and drying effects;

[0062] S3. Set the target moisture value of the coal sample and automatically adjust the heater temperature and drying time according to the feedback of temperature and humidity to ensure that the sample moisture meets the standard;

[0063] See also Figure 3 In this embodiment, the specific step S1 includes:

[0064] S101: Set the slurry sampling volume based on the empirical slurry concentration and the amount of dry coal slime required for sample preparation;

[0065] S102: Based on the real-time feedback value of the flow rate, the sampled slurry flow rate is accumulated and counted;

[0066] S103: When the slurry sampling flow rate reaches the set slurry volume value, the feed valve is closed;

[0067] S104: Automatically correct the set slurry sampling volume value according to the sample thickness value fed back by the cake pressing device.

[0068] In this embodiment, the slurry sampling volume value of S101 is set as follows:

[0069] According to historical production experience, the concentration of flotation clean coal slurry is xg / L, the instantaneous value of slurry sampling flow rate is yL / min, the sampling time is t(s), the slurry sampling volume is V(L), and the amount of dry coal powder required for sample preparation is zg, which can fluctuate within the range of plus or minus 10%. Then:

[0070] z*0.9≤x*y*t / 60≤z*1.1

[0071] V=y*t / 60

[0072] In this embodiment, the method for calculating the volume of slurry sampling in S102 is as follows:

[0073] Assume that the start time of opening the sampling valve for each sampling is t1, the end time of closing the sampling valve is t2, and the PLC collects the feedback data of the flow meter QL / min once per second; then the sampling slurry flow rate is:

[0074]

[0075] When V reaches the slurry sampling volume V (L), close the sampling valve.

[0076] In this embodiment, the method for automatically correcting the slurry sampling volume setting value in S104 is as follows:

[0077] After the cake pressing is completed, the coal sample thickness h1 is fed back and compared with the coal sample thickness value h required by the X-ray fluorescence ash analyzer. The calculation coefficient is k1. Assuming that the previous slurry sampling volume setting value is V1 and the revised slurry sampling volume setting value is V2, then:

[0078] V2=k1*V1*(h-h1)

[0079] The revised value will be used as the volume setting value for the next slurry sampling.

[0080] See also Figure 4In this embodiment, the specific step S2 includes:

[0081] S201: Setting the compressed air pressure value and the heater temperature setting value;

[0082] S202: Adjusting the opening of the pressure valve according to pressure feedback;

[0083] S203: Adjust the heater temperature setting value according to the temperature feedback.

[0084] In this solution, both pressure control and temperature control use the classic PID control algorithm. The temperature PID control algorithm is used for illustration below. Assuming the temperature setpoint is t0 and the temperature sensor feedback value is t1, then e(t) = t1 - t0; the temperature controller output is:

[0085]

[0086] Where: K p is the proportional gain, K p Inversely proportional to the degree of proportionality; T t is the integration time constant; T D is the differential time constant; t is the sampling time; u(t) is the output signal of the PID controller; e(t) is the difference between the set value and the feedback value.

[0087] See also Figure 5 In this embodiment, the specific steps of S3 include:

[0088] S301: Determine experimentally the time required to obtain a qualified sample of a certain volume of slurry after pressure filtration and hot air drying under specific temperature and pressure conditions, and use the temperature sensor and humidity sensor values detected by the discharge pipe of the drying barrel as the temperature and humidity set values;

[0089] S302: During the drying process, when the collected data from the discharge pipe reaches the set temperature and humidity values, the heater is stopped and stirring is delayed for a period of time;

[0090] S303: Automatically adjust the temperature and humidity setting values according to the moisture data of the coal sample after cake pressing.

[0091] The workflow of this solution is as follows:

[0092] (1) Preliminarily set the slurry sampling volume based on the amount of dry coal powder and slurry concentration (empirical value) required for the sample, set the heater temperature and compression control pressure value, and set the temperature and humidity reference value of the discharge pipe after pressurized drying;

[0093] (2) When sampling begins, the programmable controller 17 first opens the No. 3 electric valve 8 and the discharge solenoid valve 12, and collects the instantaneous value of the flow meter 7 in real time. The sampling period is 1S, and then automatically accumulates the sampled slurry flow. When the accumulated flow value reaches the set slurry sampling volume, the No. 3 electric valve 8 is closed.

[0094] (3) After the slurry sampling is completed, the No. 2 electric valve 6 is opened, the heater 3 is turned on and operates according to the set control temperature, the pressure regulating valve 1 is opened, the temperature and pressure of the compressed air entering the drying and filtering barrel 10 are controlled by PID, and the stirring motor 9 is turned on simultaneously. During this process, the No. 4 electric regulating valve 15 is in the closed state, and the filtration and drying process begins;

[0095] (IV) During the drying process, the real-time data of the second temperature sensor 13 and the humidity sensor 14 are detected in real time and compared with the set discharge pipe temperature and humidity reference values. When the temperature and humidity meet the standards, the heater 3 is stopped.

[0096] (5) Open the No. 4 electric regulating valve 15, close the discharge solenoid valve 12, start timing, and transport the coal powder to the cake pressing device 16 through high-pressure wind. At the same time, the stirring motor 9 remains in working state to ensure that the feeding process is uniform and smooth; after the feeding time reaches the set time, stop the stirring motor 9 and close the No. 4 electric regulating valve 15 and the pressure regulating valve 1.

[0097] (6) The cake pressing device 16 feeds back the sample thickness to the programmable controller 17, and automatically adjusts the slurry sampling volume setting value according to the thickness and the X-ray fluorescence ash content to the required optimal thickness value, which is used as the slurry sampling setting value for the next sampling cycle.

[0098] This solution collects a certain volume of slurry into a filter-drying drum, continuously delivering hot air at a certain pressure and temperature to the drum. This removes moisture from the slurry through filtration and evaporation, while simultaneously activating the stirring motor to ensure sample uniformity and control the moisture content to less than 5%. By regulating the slurry sampling flow rate, the pressure and temperature of the compressed air, and the moisture and uniformity of the coal sample, this solution not only achieves control of the sample and moisture content to meet the requirements of an X-ray fluorescence online ash analyzer, but also fully ensures sample uniformity. Through a "feedforward + feedback" control method, the thickness of the sample after pressing is controlled, minimizing the impact of differences in "uniformity" and "sample thickness" on the ash analyzer's detection accuracy, effectively improving the accuracy and stability of the X-ray fluorescence online ash analyzer.

[0099] Example 2:

[0100] An automatic control system for online detection of slurry ash sample quality, which can implement the automatic control method for online detection of slurry ash sample quality described in Example 1, comprises:

[0101] Sampling volume control module: sets the slurry sampling volume baseline value and threshold range, obtains the slurry flow feedback value and the sample thickness feedback from the cake pressing device, controls the slurry sampling volume within the threshold range according to the slurry flow feedback value, and adjusts the slurry sampling volume baseline value according to the sample thickness feedback from the cake pressing device;

[0102] Temperature and pressure control module: sets the hot air temperature and pressure values in slurry sampling, obtains feedback from the temperature and pressure sensors in slurry sampling, and adjusts the temperature and pressure values according to the feedback from the temperature and pressure sensors;

[0103] Coal sample drying control module: set the moisture value of the coal sample after drying, obtain the humidity feedback value of the coal sample, and adjust the heater temperature and drying time according to the humidity feedback value and the moisture value set value of the coal sample after drying.

[0104] Example 3:

[0105] The embodiment of the present invention further provides an automatic quality control device for online detection of slurry ash samples, which can implement the automatic quality control method for online detection of slurry ash samples described in the first embodiment, including a processor and a storage medium;

[0106] The storage medium is used to store instructions;

[0107] The processor is configured to operate according to the instructions to execute the steps of the following method:

[0108] Set the slurry sampling volume baseline value and threshold range, obtain the slurry flow feedback value and the sample thickness feedback from the cake pressing device, control the slurry sampling volume within the threshold range according to the slurry flow feedback value, and adjust the slurry sampling volume baseline value according to the sample thickness feedback from the cake pressing device;

[0109] Set the hot air temperature and pressure values in the slurry sampling, obtain feedback from the temperature and pressure sensors in the slurry sampling, and adjust the temperature and pressure values according to the feedback from the temperature and pressure sensors;

[0110] Set the moisture value of the coal sample after drying, obtain the humidity feedback value of the coal sample, and adjust the heater temperature and drying time according to the humidity feedback value and the moisture value set value of the coal sample after drying.

[0111] Example 4:

[0112] An embodiment of the present invention further provides a computer-readable storage medium that can implement the method for automatically controlling the quality of a slurry ash online detection sample described in Example 1. The computer-readable storage medium stores a computer program that, when executed by a processor, implements the following steps:

[0113] Set the slurry sampling volume baseline value and threshold range, obtain the slurry flow feedback value and the sample thickness feedback from the cake pressing device, control the slurry sampling volume within the threshold range according to the slurry flow feedback value, and adjust the slurry sampling volume baseline value according to the sample thickness feedback from the cake pressing device;

[0114] Set the hot air temperature and pressure values in the slurry sampling, obtain feedback from the temperature and pressure sensors in the slurry sampling, and adjust the temperature and pressure values according to the feedback from the temperature and pressure sensors;

[0115] Set the moisture value of the coal sample after drying, obtain the humidity feedback value of the coal sample, and adjust the heater temperature and drying time according to the humidity feedback value and the moisture value set value of the coal sample after drying.

[0116] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

[0117] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0118] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0119] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for automatically controlling the quality of slurry ash online detection samples, characterized in that: include: Set the slurry sampling volume baseline value and threshold range, obtain the slurry flow feedback value and the sample thickness feedback from the cake pressing device, control the slurry sampling volume within the threshold range according to the slurry flow feedback value, and adjust the slurry sampling volume baseline value according to the sample thickness feedback from the cake pressing device; Set the hot air temperature and pressure values in the slurry sampling, obtain feedback from the temperature and pressure sensors in the slurry sampling, and adjust the temperature and pressure values according to the feedback from the temperature and pressure sensors; Set the moisture value of the coal sample after drying, obtain the humidity feedback value of the coal sample, and adjust the heater temperature and drying time according to the humidity feedback value and the moisture value set value of the coal sample after drying.

2. The automatic quality control method for online detection of slurry ash content according to claim 1 is characterized in that: Set the slurry sampling volume baseline value and threshold range, obtain the slurry flow feedback value and the sample thickness feedback from the cake pressing device, control the slurry sampling volume within the threshold range according to the slurry flow feedback value, and adjust the slurry sampling volume baseline value according to the sample thickness feedback from the cake pressing device, including: The slurry sampling volume value is set based on the empirical slurry concentration and the amount of dry coal slime required for sample preparation; According to the real-time feedback value of flow, the sampling slurry flow is accumulated and counted; When the slurry sampling flow rate reaches the set slurry volume value, close the feed valve; According to the sample thickness value fed back by the cake pressing device, the set slurry sampling volume setting value is corrected.

3. The automatic quality control method for online detection of slurry ash content according to claim 2 is characterized in that: The slurry sampling volume value is: z*0.9≤x*y*t / 60≤z*1.1 V=y*t / 60 Where: V is the slurry sampling volume value, y is the instantaneous value of the slurry sampling flow rate, t is the sampling time, x is the concentration of flotation clean coal slurry obtained based on historical production experience, and z is the amount of dry coal powder required for sample preparation.

4. The automatic quality control method for online detection of slurry ash content according to claim 2, characterized in that: The cumulative statistical sampling slurry flow rate is: Where: V is the cumulative statistical sampling slurry flow, t2 is the time to close the sampling valve, t1 is the time to open the sampling valve, Q is the feedback data of the flow meter collected once per second, and t is the sampling time.

5. The automatic quality control method for online detection of slurry ash content according to claim 2 is characterized in that: The corrected slurry sampling volume setting value is: V2=k1*V1*(h-h1) Where: V2 is the corrected slurry sampling volume setting value, k1 is the calculation coefficient, V1 is the previous slurry sampling volume setting value, h is the coal sample thickness value required by the X-ray fluorescence ash analyzer, and h1 is the coal sample thickness fed back after the cake pressing is completed.

6. The automatic quality control method for online detection of slurry ash content according to claim 1 is characterized in that: Set the hot air temperature and pressure values in the slurry sampling, obtain feedback from the temperature and pressure sensors in the slurry sampling, and adjust the temperature and pressure values according to the feedback from the temperature and pressure sensors, including: Set the compressed air pressure value and heater temperature setting value; Adjust the pressure valve opening according to pressure feedback; Adjust heater temperature setpoint based on temperature feedback; The pressure valve opening adjustment and the heater temperature setting value adjustment are both implemented using a PID control algorithm, and the expression of the PID control algorithm is: Where: u(t) is the output signal of the PID controller; K p is the proportional gain; e(t) is the difference between the set value and the feedback value; T t is the integration time constant; T D is the differential time constant; t is the sampling time.

7. The automatic quality control method for online detection of slurry ash content samples according to claim 1 is characterized in that: Set the moisture value of the coal sample after drying, obtain the humidity feedback value of the coal sample, and adjust the heater temperature and drying time according to the humidity feedback value and the moisture value set value of the coal sample after drying, including: The time required to obtain a qualified sample of a certain volume of slurry under specific temperature and pressure conditions after pressure filtration and hot air drying, as well as the temperature sensor and humidity sensor values detected by the discharge pipe of the drying barrel are used as the temperature and humidity set values; During the dosing and drying process, when the collected discharge pipe data reaches the set temperature and humidity values, the heater will stop working and the stirring will be delayed for a period of time; The temperature and humidity setting values are automatically adjusted according to the moisture data of the coal sample after cake pressing.

8. An automatic control system for online detection of ash content in slurry samples, characterized by: include: Sampling volume control module: sets the slurry sampling volume baseline value and threshold range, obtains the slurry flow feedback value and the sample thickness feedback from the cake pressing device, controls the slurry sampling volume within the threshold range according to the slurry flow feedback value, and adjusts the slurry sampling volume baseline value according to the sample thickness feedback from the cake pressing device; Temperature and pressure control module: sets the hot air temperature and pressure values in slurry sampling, obtains feedback from the temperature and pressure sensors in slurry sampling, and adjusts the temperature and pressure values according to the feedback from the temperature and pressure sensors; Coal sample drying control module: set the moisture value of the coal sample after drying, obtain the humidity feedback value of the coal sample, and adjust the heater temperature and drying time according to the humidity feedback value and the moisture value set value of the coal sample after drying.

9. An automatic control device for online detection of ash content in slurry samples, characterized by: including processors and storage media; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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