A system and method for continuous control of pulp consistency in an intermediate pump station

Abstract

The application discloses a kind of intermediate pump station slurry concentration continuous control system and method, the outlet of inlet pipeline is connected with the import of inlet pump pipeline by first branch pipe, second branch pipe and third branch pipe of parallel connection, the import of outlet pipeline is connected with the outlet of inlet pump pipeline by delivery pump;First concentration sensor is installed on inlet pipeline, first electric valve is installed on first branch pipe, concentration tank and second electric valve are installed on second branch pipe, dilution tank and third electric valve are installed on third branch pipe, second concentration sensor is installed on inlet pump pipeline;First concentration sensor and second concentration sensor are connected with the input end of controller, the output end of controller is connected with first electric valve, second electric valve and third electric valve.The application can control high concentration slurry into dilution tank for dilution, control low concentration slurry into concentration tank for concentration, realize the continuous automatic regulation of slurry delivery concentration, control slurry concentration in constant range.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous slurry pipeline transportation, and in particular to a continuous slurry concentration control system and method for an intermediate pumping station, which is applicable to intermediate pumping stations with unstable slurry concentration in long-distance slurry pipelines. Background Art

[0002] After over 70 years of research and development, slurry pipelines, a new, green method for transporting solid materials, have become the fifth modern logistics transport method. With technological advancements, slurry pipelines can now transport a wide range of media, including coal, metallic / non-metallic minerals, power plant ash / fly ash, smelting tailings, biomass, and water conservancy. These pipelines offer broad application prospects and potential markets, and are of strategic importance to the safety of energy and mineral transportation in my country.

[0003] For specific slurry pipelines, excessively high slurry concentrations and increased viscosity can easily lead to pipeline blockages and increased energy consumption. Excessively low concentrations can reduce pipeline efficiency and increase the dehydration load on the user side. Therefore, maintaining a constant slurry concentration within a certain range is crucial for the stable operation of slurry pipelines.

[0004] At present, long-distance slurry transportation pipelines are often set as open processes, that is, the intermediate pump station downloads all the slurry transported from the upstream pipeline and then re-adjusts the concentration in the slurry storage tank, and then transports the slurry with adjusted concentration to the downstream pipeline through the delivery pump, and the process is carried out in sequence.

[0005] The above method has the following problems:

[0006] 1. It is impossible to achieve online continuous adjustment of slurry concentration and continuous slurry transportation;

[0007] 2. Each intermediate pump station needs to repeatedly set up slurry storage tanks, slurry mixing tanks and other facilities, which increases investment;

[0008] 3. The residual pressure of the upstream pumping station cannot be effectively utilized, and a feeding pump needs to be installed. Summary of the Invention

[0009] In view of the above problems existing in the prior art, the present invention provides a continuous control system and method for slurry concentration in an intermediate pumping station.

[0010] The present invention discloses a continuous control system for slurry concentration in an intermediate pumping station, comprising: an inlet pipe, a pump inlet pipe and an outlet pipe;

[0011] The outlet of the station inlet pipeline is connected to the inlet of the pump inlet pipeline through a first branch pipe, a second branch pipe, and a third branch pipe connected in parallel, and the outlet of the pump inlet pipeline is connected to the inlet of the station outlet pipeline through a delivery pump; a first concentration sensor is installed on the station inlet pipeline, a first electric valve is installed on the first branch pipe, a concentration tank and a second electric valve are installed on the second branch pipe, a dilution tank and a third electric valve are installed on the third branch pipe, and a second concentration sensor is installed on the pump inlet pipeline;

[0012] The first concentration sensor and the second concentration sensor are connected to an input end of a controller, and an output end of the controller is connected to the first electric valve, the second electric valve, and the third electric valve.

[0013] As a further improvement of the present invention, it further comprises: a clear water tank;

[0014] The clean water tank is connected to the inlet of the pump inlet pipeline through a fourth branch pipe. A fourth electric valve is installed on the fourth branch pipe, and the fourth electric valve is connected to the output end of the controller.

[0015] As a further improvement of the present invention, the controller controls the first electric valve to open when the slurry concentration is normal, controls the second electric valve to open when the slurry concentration is low, controls the third electric valve to open when the slurry concentration is high, and controls the fourth electric valve to open when the slurry concentration is too high.

[0016] As a further improvement of the present invention,

[0017] When the deviation value δ1 between the slurry concentration detected by the first concentration sensor and the target concentration is within a preset deviation range, the first electric valve is controlled to open;

[0018] When the deviation value δ1 is continuously less than the negative deviation value of the preset deviation range for a first preset time, the first electric valve is controlled to close and the second electric valve is controlled to open; at this time, if the deviation value δ2 between the slurry concentration detected by the second concentration sensor and the target concentration is continuously less than the negative deviation value of the preset deviation range for a second preset time, the controller alarms and prompts a concentration failure;

[0019] When the deviation value δ1 is continuously greater than the positive deviation value of the preset deviation range for a first preset time, the first electric valve is controlled to close and the third electric valve is controlled to open; at this time, if the deviation value δ2 is continuously greater than the positive deviation value of the preset deviation range for a second preset time, the controller alarms and prompts a dilution fault.

[0020] As a further improvement of the present invention,

[0021] If the deviation value δ2 is continuously greater than the critical deviation value for a second preset time, and the critical deviation value is greater than the positive deviation value, the controller alarms and prompts a concentration fault or a dilution fault, and controls the second electric valve or the third electric valve to close and the fourth electric valve to open.

[0022] As a further improvement of the present invention,

[0023] The calculation formulas for the deviation value δ1 and the deviation value δ2 are:

[0024]

[0025]

[0026] Wherein, C1 is the current slurry concentration of the inlet pipeline continuously detected by the first concentration sensor, C2 is the current slurry concentration of the inlet pipeline continuously detected by the second concentration sensor, and C0 is the target concentration;

[0027] The first preset time and the second preset time are 60s;

[0028] The preset deviation range has a negative deviation value of -5%, a positive deviation value of +5%, and a critical deviation value of +10%.

[0029] The present invention also discloses a method for continuous control of slurry concentration in an intermediate pumping station, comprising:

[0030] Calculate the deviation δ1 between the current slurry concentration and the target concentration based on the first concentration sensor continuously detecting the current slurry concentration in the inlet pipeline;

[0031] Calculate the deviation δ2 between the current slurry concentration and the target concentration based on the continuous detection of the current slurry concentration in the pump inlet pipeline by the second concentration sensor;

[0032] Determine whether the deviation value δ1 is within the preset deviation range:

[0033] If yes, the controller controls the first electric valve to open, so that the slurry enters the pump inlet pipeline from the station inlet pipeline and is then transported to the station outlet pipeline through the delivery pump;

[0034] If not, determine whether the deviation value δ1 is continuously smaller than the negative deviation value of the preset deviation range or larger than the positive deviation value of the preset deviation range for a first preset time:

[0035] If the deviation value δ1 is continuously less than the negative deviation value of the preset deviation range for a first preset time, the first electric valve is controlled to close and the second electric valve is controlled to open, so that the slurry enters the pump inlet pipeline after being concentrated in the concentration tank from the inlet pipeline, and is then transported to the outlet pipeline by the delivery pump; at this time, if the deviation value δ2 is continuously less than the negative deviation value of the preset deviation range for a second preset time, the controller alarms and prompts a concentration failure;

[0036] If the deviation value δ1 continues to be greater than the positive deviation value of the preset deviation range for a first preset time, the first electric valve is controlled to close and the third electric valve is controlled to open, so that the slurry is diluted from the inlet pipeline through the dilution tank and enters the pump inlet pipeline, and is transported to the outlet pipeline through the delivery pump; at this time, if the deviation value δ2 continues to be greater than the positive deviation value of the preset deviation range for a second preset time, the controller will alarm and prompt a dilution failure.

[0037] As a further improvement of the present invention, it also includes:

[0038] If the deviation value δ1 does not remain smaller than the negative deviation value of the preset deviation range or larger than the positive deviation value of the preset deviation range for a first preset time, the first electric valve is maintained in an open state;

[0039] When the deviation value δ1 is continuously less than the negative deviation value of the preset deviation range for a first preset time, if the deviation value δ2 is within the preset deviation range or is not continuously less than the negative deviation value of the preset deviation range for a second preset time, the first electric valve is maintained closed and the second electric valve is maintained open;

[0040] When the deviation value δ1 is continuously greater than the positive deviation value of the preset deviation range for the first preset time, if the deviation value δ2 is within the preset deviation range or does not continuously exceed the positive deviation value of the preset deviation range for the second preset time, the first electric valve is maintained closed and the third electric valve is maintained open.

[0041] As a further improvement of the present invention, it also includes:

[0042] When the deviation value δ1 is continuously less than the negative deviation value of the preset deviation range for a first preset time, and the deviation value δ2 is continuously greater than the critical deviation value for a second preset time, and the critical deviation value is greater than the positive deviation value, the controller alarms and prompts a concentration failure, and controls the second electric valve to close and the fourth electric valve to open, so that the clean water enters the pump inlet pipeline through the clean water tank and is delivered to the outlet pipeline by the delivery pump.

[0043] When the deviation value δ1 is continuously greater than the positive deviation value of the preset deviation range for the first preset time, if the deviation value δ2 is continuously greater than the critical deviation value for the second preset time, and the critical deviation value is greater than the positive deviation value; the controller alarms and prompts a dilution fault, and controls the third electric valve to close and the fourth electric valve to open, and the clean water enters the pump inlet pipeline through the clean water tank and is transported to the outlet pipeline through the delivery pump.

[0044] As a further improvement of the present invention, it also includes:

[0045] When the deviation value δ1 is continuously less than the negative deviation value of the preset deviation range for a first preset time, and if the deviation value δ2 is not continuously greater than the critical deviation value for a second preset time, the controller is maintained to alarm and prompt the state of the concentration fault;

[0046] When the deviation value δ1 is a positive deviation value greater than the preset deviation range for a first preset time, if the deviation value δ2 does not continue to be greater than the critical deviation value for a second preset time, the controller is maintained in an alarm state and prompts a dilution fault.

[0047] Compared with the prior art, the present application has the following advantages:

[0048] The first concentration sensor and the second concentration sensor detect the concentration of high-concentration slurry or low-concentration slurry in the inlet pipeline and the pump inlet pipeline, and transmit the concentration signal of the slurry to the controller; the controller controls the opening and closing of the corresponding electric valve according to the concentration signal, controls the high-concentration slurry to enter the dilution tank for dilution, and controls the low-concentration slurry to enter the concentration tank for concentration, thereby realizing continuous automatic adjustment of the slurry conveying concentration, controlling the slurry concentration within a constant range, and avoiding problems such as excessively high or low slurry conveying concentration; at the same time, when the pump inlet slurry concentration is too high, the online switching of clean water into the conveying pump is realized to prevent pipeline stoppage caused by excessively high concentration. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 The structure diagram of the intermediate pump station slurry concentration continuous control system is disclosed for an embodiment of the present application.

[0050] In the drawings:

[0051] 1, inlet pipeline, 2, pump inlet pipeline, 3, outlet pipeline, 4, concentration tank, 5, dilution tank, 6, clean water tank, 7, conveying pump, 8, first electric valve, 9, second electric valve, 10, third electric valve, 11, fourth electric valve, 12, first concentration sensor, 13, second concentration sensor, 14, controller. DETAILED DESCRIPTION

[0052] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0053] The present application will be described in further detail below in connection with the drawings:

[0054] The present application provides an intermediate pump station slurry concentration continuous control system, comprising: an inlet pipeline 1, a pump inlet pipeline 2, an outlet pipeline 3, a concentration tank 4, a dilution tank 5, a clean water tank 6, a conveying pump 7, a first electric valve 8, a second electric valve 9, a third electric valve 10, a fourth electric valve 11, a first concentration sensor 12, a second concentration sensor 13, and a controller 14; wherein,

[0055] The inlet of the station pipeline 1 is connected to the upstream pipeline, and the outlet of the station pipeline 1 is connected to the inlet of the pump inlet pipeline 2 through the first branch pipe, the second branch pipe and the third branch pipe connected in parallel. The clear water tank 6 is connected to the inlet of the pump inlet pipeline 2 through the fourth branch pipe, and the outlet of the pump inlet pipeline 2 is connected to the inlet of the station pipeline 8 through the delivery pump 7. The outlet of the station pipeline 8 is connected to the downstream pipeline; a first concentration sensor 12 is installed on the station pipeline 1, a first electric valve 8 is installed on the first branch pipe, a concentration tank 4 and a second electric valve 9 are installed on the second branch pipe, a dilution tank 5 and a third electric valve 10 are installed on the third branch pipe, a fourth electric valve 11 is installed on the fourth branch pipe, and a second concentration sensor 13 is installed on the pump inlet pipeline 2; the first concentration sensor 12 and the second concentration sensor 13 are installed on the pump inlet pipeline 2. The concentration sensor 13 is connected to the input end of the controller 14 through a data line, and is used to detect the concentration of the slurry in the station inlet pipeline and the pump inlet pipeline, and upload the concentration signal to the controller 14; the output end of the controller 14 is connected to the first electric valve 8, the second electric valve 9, the third electric valve 10 and the fourth electric valve 11 through a data line, and is used to control the judgment based on the above-mentioned concentration information, and then control the opening and closing of the first electric valve 8, the second electric valve 9, the third electric valve 10 or the fourth electric valve 11; when the slurry concentration is normal, the first electric valve 8 is controlled to open; when the slurry concentration is low, the second electric valve 9 is controlled to open; when the slurry concentration is high, the third electric valve 10 is controlled to open; when the slurry concentration is too high, the fourth electric valve 11 is controlled to open.

[0056] Furthermore, a second electric valve 9 and a third electric valve 10 are respectively provided at the water inlet and outlet of the concentration tank 4 and the dilution tank 5 , so as to facilitate maintenance of the concentration tank 4 and the dilution tank 5 .

[0057] Based on the above control system, the present invention provides a method for continuous control of slurry concentration in an intermediate pumping station, comprising:

[0058] S1, the controller 14 continuously detects the current slurry concentration of the inlet pipeline 1 based on the first concentration sensor 12, and calculates the deviation value δ1 between the current slurry concentration and the target concentration;

[0059] The calculation formula of the deviation value δ1 is:

[0060]

[0061] Where C1 is the current slurry concentration of the inlet pipeline continuously detected by the first concentration sensor, and C0 is the target concentration;

[0062] S2, the controller 14 continuously detects the current slurry concentration in the pump inlet pipe 2 based on the second concentration sensor 13, and calculates the deviation value δ2 between the current slurry concentration and the target concentration;

[0063] The calculation formula of the deviation value δ2 is:

[0064]

[0065] Where C2 is the current slurry concentration in the pump pipeline continuously detected by the second concentration sensor, and C0 is the target concentration;

[0066] S3. The controller 14 determines whether the deviation values ​​δ1 and δ2 are within a preset deviation range (which can be selected as ±5% of the target concentration, with a negative deviation value of -5% and a positive deviation value of +5%), the duration of the deviation outside the preset deviation range, whether the deviation value δ2 is greater than a critical deviation value (the critical deviation value is greater than the positive deviation value, which can be selected as +10%), and the duration of the deviation; and based on the determination of the above conditions, controls the opening and closing of the first electric valve 8, the second electric valve 9, the third electric valve 10, or the fourth electric valve 11.

[0067] Specifically:

[0068] S31, if the deviation value δ1 is within the preset deviation range (±5%) or is less than the negative deviation value (-5%) of the preset deviation range or greater than the positive deviation value (+5%) of the preset deviation range for a first preset time (optionally 60s), the controller 14 controls the first electric valve 8 to open (in the initial state, the first electric valve 8, the second electric valve 9, the third electric valve 10, and the fourth electric valve 11 are all closed), so that the slurry enters the pump inlet pipeline 2 from the station inlet pipeline 1 and is then transported to the station outlet pipeline 3 through the delivery pump 7;

[0069] S32, if the deviation value δ1 is continuously less than the negative deviation value (-5%) of the preset deviation range for a first preset time (60s) and the deviation value δ2 is within the preset deviation range (±5%) or is not continuously less than the negative deviation value (-5%) of the preset deviation range for a second preset time (optionally 60s), the controller 14 controls the first electric valve 8 to close and the second electric valve 9 to open, so that the slurry flows from the inlet pipeline 1 through the thickening tank 4 and then enters the pump inlet pipeline 2, and is transported to the outlet pipeline 3 through the delivery pump 7;

[0070] At this time, if the deviation value δ2 is continuously less than the negative deviation value (-5%) of the preset deviation range for a second preset time (optionally 60 seconds), or is greater than the critical deviation value (+10%) for less than the second preset time (60 seconds), the controller 14 will alarm and prompt a concentration failure; if the deviation value δ2 is continuously greater than the critical deviation value (+10%) for the second preset time (60 seconds), the controller 14 will alarm and prompt a concentration failure, and control the second electric valve 9 to close and the fourth electric valve 11 to open, so that the clean water enters the pump inlet pipe 2 through the clean water tank 6 and is delivered to the outlet pipe 3 through the delivery pump 7;

[0071] S33. If the deviation value δ1 is continuously greater than the positive deviation value (+5%) of the preset deviation range for a first preset time (optionally 60 seconds) and the deviation value δ2 is within the preset deviation range (±5%) or does not continuously exceed the positive deviation value (+5%) of the preset deviation range for a second preset time (optionally 60 seconds), the first electric valve 8 is controlled to close and the third electric valve 10 is controlled to open, so that the slurry is diluted from the inlet pipeline 1 through the dilution tank 5 and then enters the pump inlet pipeline 2, and is then delivered to the outlet pipeline 3 through the delivery pump 7;

[0072] At this time, if the deviation value δ2 continues to be greater than the positive deviation value (+5%) of the preset deviation range for a second preset time (60s can be selected) or is greater than the critical deviation value (+10%) for not continuing the second preset time (60s), the controller 14 alarms and prompts a dilution fault; if the deviation value δ2 continues to be greater than the critical deviation value (+10%) for a second preset time (60s), the controller 14 alarms and prompts a dilution fault, and controls the third electric valve 10 to close and the fourth electric valve 11 to open, and the clean water enters the pump inlet pipe 2 through the clean water tank 6, and is transported to the outlet pipe 3 through the delivery pump 7.

[0073] Furthermore, when the clean water tank 6 enters the pump inlet pipe 2, the controller 14 can also control the first electric valve 8 to open at the same time.

[0074] The advantages of the present invention are:

[0075] The present invention detects the concentration of high-concentration slurry or low-concentration slurry in the station inlet pipeline and the pump inlet pipeline through a first concentration sensor and a second concentration sensor, and transmits the slurry concentration signal to a controller; the controller controls the corresponding electric valve switch according to the concentration signal, controls the high-concentration slurry to enter the dilution tank for dilution, and controls the low-concentration slurry to enter the concentration tank for concentration, thereby realizing continuous automatic adjustment of the slurry delivery concentration, controlling the slurry concentration within a constant range, and avoiding problems such as the slurry delivery concentration being too high or too low; at the same time, when the concentration of the pump inlet slurry is too high, clean water is switched online to enter the delivery pump to prevent the pipeline from being stopped and blocked due to excessive concentration.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A continuous control system for slurry concentration in an intermediate pumping station, characterized in that: include: Inlet pipeline, pump inlet pipeline and outlet pipeline; The outlet of the station inlet pipeline is connected to the inlet of the pump inlet pipeline through a first branch pipe, a second branch pipe, and a third branch pipe connected in parallel, and the outlet of the pump inlet pipeline is connected to the inlet of the station outlet pipeline through a delivery pump; a first concentration sensor is installed on the station inlet pipeline, a first electric valve is installed on the first branch pipe, a concentration tank and a second electric valve are installed on the second branch pipe, a dilution tank and a third electric valve are installed on the third branch pipe, and a second concentration sensor is installed on the pump inlet pipeline; The first concentration sensor and the second concentration sensor are connected to the input end of the controller, and the output end of the controller is connected to the first electric valve, the second electric valve and the third electric valve; The controller controls the first electric valve to open when the slurry concentration is normal, controls the second electric valve to open when the slurry concentration is low, and controls the third electric valve to open when the slurry concentration is high, based on the slurry concentration in the station inlet pipe and the pump inlet pipe detected by the first concentration sensor and the second concentration sensor. When the deviation value δ1 between the slurry concentration detected by the first concentration sensor and the target concentration is within a preset deviation range, the first electric valve is controlled to open; When the deviation value δ1 is continuously less than the negative deviation value of the preset deviation range for a first preset time, the first electric valve is controlled to close and the second electric valve is controlled to open; at this time, if the deviation value δ2 between the slurry concentration detected by the second concentration sensor and the target concentration is continuously less than the negative deviation value of the preset deviation range for a second preset time, the controller alarms and prompts a concentration failure; When the deviation value δ1 is continuously greater than the positive deviation value of the preset deviation range for a first preset time, the first electric valve is controlled to be closed and the third electric valve is controlled to be opened; At this time, if the deviation value δ2 is continuously greater than the positive deviation value of the preset deviation range for a second preset time, the controller will alarm and prompt a dilution fault.

2. The continuous control system for slurry concentration in an intermediate pumping station according to claim 1, characterized in that: Also includes: clear pool; The clean water tank is connected to the inlet of the pump inlet pipeline through a fourth branch pipe. A fourth electric valve is installed on the fourth branch pipe, and the fourth electric valve is connected to the output end of the controller.

3. The continuous control system for slurry concentration in an intermediate pumping station according to claim 2, characterized in that: The controller controls the fourth electric valve to open when the slurry concentration is too high based on the concentration of the slurry in the station inlet pipe and the pump inlet pipe detected by the first concentration sensor and the second concentration sensor.

4. The continuous control system for slurry concentration in an intermediate pumping station according to claim 3, characterized in that: If the deviation value δ2 is continuously greater than the critical deviation value for a second preset time, and the critical deviation value is greater than the positive deviation value, the controller alarms and prompts a concentration fault or a dilution fault, and controls the second electric valve or the third electric valve to close and the fourth electric valve to open.

5. The continuous control system for slurry concentration in an intermediate pumping station according to claim 4, characterized in that: The calculation formulas for the deviation value δ1 and the deviation value δ2 are: Wherein, C1 is the current slurry concentration of the inlet pipeline continuously detected by the first concentration sensor, C2 is the current slurry concentration of the inlet pipeline continuously detected by the second concentration sensor, and C0 is the target concentration; The first preset time and the second preset time are 60s; The preset deviation range has a negative deviation value of -5%, a positive deviation value of +5%, and a critical deviation value of +10%.

6. A method for continuous control of slurry concentration at an intermediate pumping station based on the continuous control system for slurry concentration at an intermediate pumping station according to any one of claims 1 to 5, characterized in that: include: Calculate the deviation δ1 between the current slurry concentration and the target concentration based on the first concentration sensor continuously detecting the current slurry concentration in the inlet pipeline; Calculate the deviation δ2 between the current slurry concentration and the target concentration based on the continuous detection of the current slurry concentration in the pump inlet pipeline by the second concentration sensor; Determine whether the deviation value δ1 is within the preset deviation range: If yes, the controller controls the first electric valve to open, so that the slurry enters the pump inlet pipeline from the station inlet pipeline and is then transported to the station outlet pipeline through the delivery pump; If not, determine whether the deviation value δ1 is continuously smaller than the negative deviation value of the preset deviation range or larger than the positive deviation value of the preset deviation range for a first preset time: If the deviation value δ1 is continuously less than the negative deviation value of the preset deviation range for a first preset time, the first electric valve is controlled to close and the second electric valve is controlled to open, so that the slurry enters the pump inlet pipeline after being concentrated in the concentration tank from the inlet pipeline, and is then transported to the outlet pipeline by the delivery pump; at this time, if the deviation value δ2 is continuously less than the negative deviation value of the preset deviation range for a second preset time, the controller alarms and prompts a concentration failure; If the deviation value δ1 continues to be greater than the positive deviation value of the preset deviation range for a first preset time, the first electric valve is controlled to close and the third electric valve is controlled to open, so that the slurry is diluted from the inlet pipeline through the dilution tank and enters the pump inlet pipeline, and is transported to the outlet pipeline through the delivery pump; at this time, if the deviation value δ2 continues to be greater than the positive deviation value of the preset deviation range for a second preset time, the controller will alarm and prompt a dilution failure.

7. The method for continuous control of slurry concentration at an intermediate pumping station according to claim 6, characterized in that: Also includes: If the deviation value δ1 does not remain smaller than the negative deviation value of the preset deviation range or larger than the positive deviation value of the preset deviation range for a first preset time, the first electric valve is maintained in an open state; When the deviation value δ1 is continuously less than the negative deviation value of the preset deviation range for a first preset time, if the deviation value δ2 is within the preset deviation range or is not continuously less than the negative deviation value of the preset deviation range for a second preset time, the first electric valve is maintained closed and the second electric valve is maintained open; When the deviation value δ1 is continuously greater than the positive deviation value of the preset deviation range for the first preset time, if the deviation value δ2 is within the preset deviation range or does not continuously exceed the positive deviation value of the preset deviation range for the second preset time, the first electric valve is maintained closed and the third electric valve is maintained open.

8. The method for continuous control of slurry concentration at an intermediate pumping station according to claim 6, characterized in that: When the intermediate pump station slurry concentration continuous control system further includes: a clear water tank; the clear water tank is connected to the inlet of the pump inlet pipeline through a fourth branch pipe, a fourth electric valve is installed on the fourth branch pipe, and the fourth electric valve is connected to the output end of the controller; The method for continuous control of slurry concentration at the intermediate pump station further includes: When the deviation value δ1 is continuously less than the negative deviation value of the preset deviation range for a first preset time, and the deviation value δ2 is continuously greater than the critical deviation value for a second preset time, and the critical deviation value is greater than the positive deviation value, the controller alarms and prompts a concentration failure, and controls the second electric valve to close and the fourth electric valve to open, so that the clean water enters the pump inlet pipeline through the clean water tank and is delivered to the outlet pipeline by the delivery pump. When the deviation value δ1 is continuously greater than the positive deviation value of the preset deviation range for the first preset time, if the deviation value δ2 is continuously greater than the critical deviation value for the second preset time, and the critical deviation value is greater than the positive deviation value; the controller alarms and prompts a dilution fault, and controls the third electric valve to close and the fourth electric valve to open, and the clean water enters the pump inlet pipeline through the clean water tank and is transported to the outlet pipeline through the delivery pump.

9. The method for continuous control of slurry concentration at an intermediate pumping station according to claim 8, characterized in that: Also includes: When the deviation value δ1 is continuously less than the negative deviation value of the preset deviation range for a first preset time, and if the deviation value δ2 is not continuously greater than the critical deviation value for a second preset time, the controller is maintained to alarm and prompt the state of the concentration fault; When the deviation value δ1 is continuously greater than the positive deviation value of the preset deviation range for the first preset time, if the deviation value δ2 is not continuously greater than the critical deviation value for the second preset time, the controller will maintain the alarm and prompt the dilution fault state.

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