Solid-liquid mixed material conveying system

Abstract

The utility model provides a solid-liquid mixed material conveying system which comprises a material storage tank, a discharging control unit, a power conveying unit and a gas-liquid separation tank and is used for realizing gas-liquid separation and water distribution, and a dehydration unit conveys separated water to the gas-liquid separation tank; the pressure monitoring and control unit is used for controlling the outlet pressure of the slurry pump; the water storage tank is used for receiving the return water from the gas-liquid separation tank, storing water and supplementing water for the conveying process of the solid-liquid mixture; the water inlet pipe is used for conveying desalted water to the water storage tank. The discharging control unit stably controls the water level of the material storage tank. And parts associated with the centrifugal dehydrator, the gas-liquid separation tank, the water storage tank and the like perform own functions, so that water resource recycling, gas-phase pressure balance and liquid level stability are realized. By means of the whole system, stable, efficient and energy-saving conveying of nylon 6 slices from the low position to the high position can be achieved, a foundation is built for efficient and stable polymerization production of nylon 6, and the industrial application value is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to the production technical field of nylon 6 slice, especially relates to a solid liquid mixed material conveying system. BACKGROUND

[0002] At present, part of the process directly uses the slurry pump to send the nylon 6 slice from low position to high position, and the process has certain drawbacks, cannot guarantee the material level stability of the nylon 6 slice at low position, once the low-position nylon 6 slice storage tank has material accumulation, will block the slurry pump and lead to production interruption, influence the continuity and efficiency of production. Another part of the process uses the water jet pump conveying process to send the nylon 6 slice from low position to high position, and the process has high energy consumption in the production process, does not meet the low-carbon development requirement of the society today. UTILITY MODEL CONTENT

[0003] The utility model embodiment is to provide a solid liquid mixed material conveying system.

[0004] The embodiment of the utility model adopts the following technical scheme: a solid liquid mixed material conveying system, comprising:

[0005] Material storage tank for storing solid liquid mixture and the internal solid liquid mixture and material level water level proportion is relatively constant;

[0006] Feed inlet is set up at the top of the material storage tank, and is used for solid material to enter the material storage tank;

[0007] Discharge control unit is connected with the material storage tank, and is used for controlling the discharge of the material storage tank based on the liquid level height of the material storage tank;

[0008] Gas-liquid separation tank, including gas-liquid separation tank and the first backwater pipe, second backwater pipe, balance pipe connected with the gas-liquid separation tank, is used for realizing gas-liquid separation and water distribution, the first backwater pipe is connected with the material storage tank;

[0009] Power conveying unit, including discharge pipe and slurry pump set on the discharge pipe, one end of the discharge pipe is connected with the material storage tank, and the power conveying unit provides power for conveying solid liquid mixture;

[0010] Dehydration unit is connected with the other end of the discharge pipe to carry out dehydration to the solid liquid mixture from the material storage tank, and the dehydration unit is also connected with the gas-liquid separation tank through back-liquid pipe to convey the water separated to the gas-liquid separation tank;

[0011] Pressure monitoring and control unit is set on the discharge pipe and is used for monitoring the pressure in the solid liquid mixture conveying process to control the outlet pressure of the slurry pump;

[0012] a water storage tank connected with the second return water pipe and a balance pipe respectively, and receiving the return water from the gas-liquid separation tank, the balance pipe being used for balancing the pressure of the water storage tank and the gas-liquid separation tank; the water storage tank storing water and supplementing water for the delivery process of the solid-liquid mixture;

[0013] a water inlet pipe connected with the water storage tank and delivering desalinated water to the water storage tank.

[0014] In some embodiments, the discharge control unit comprises a first discharge valve arranged at one end of the discharge pipe close to the material storage tank, and the first discharge valve is in an open state and in a closed state when the solid-liquid mixture delivery system stops running or is abnormally maintained.

[0015] In some embodiments, the discharge control unit further comprises a first liquid level meter arranged on the material storage tank and used for detecting the liquid level height of the material storage tank, and a first regulating valve arranged on the first return water pipe, when the first liquid level meter detects that the liquid level in the material storage tank drops to a first target liquid level height, the opening degree of the first regulating valve is increased to enable the water in the gas-liquid separation tank to enter the material storage tank through the first return water pipe.

[0016] In some embodiments, the discharge control unit further comprises a second liquid level meter, a third liquid level meter and a second discharge valve arranged on the discharge pipe between the material storage tank and the slurry pump, when the second liquid level meter detects that the liquid level height of the material storage tank reaches a second target liquid level height, the opening degree of the second discharge valve is increased to increase the discharge speed of the material storage tank, and when the third liquid level meter detects that the liquid level height of the material storage tank drops to a third target liquid level height, the opening degree of the second discharge valve is reduced to reduce the discharge speed of the material storage tank.

[0017] In some embodiments, the solid-liquid mixture delivery system further comprises a water distribution ring arranged on the inner wall of the material storage tank and used for distributing the water flowing back to the material storage tank to flow downward along the inner wall of the material storage tank.

[0018] In some embodiments, the solid-liquid mixture delivery system further comprises a fourth liquid level meter arranged on the water storage tank and used for detecting the liquid level of the water storage tank, and the fourth liquid level meter is interconnected with the second connection valve; and a second regulating valve arranged on the water inlet pipe and adjusting the opening degree according to the detection result of the fourth liquid level meter.

[0019] In some embodiments, a water outlet pipe is arranged between the water storage tank and the second discharge valve, and a water outlet valve is arranged on the water outlet pipe, and the water storage tank delivers water to the second discharge valve through the water delivery pipe.

[0020] In some embodiments, the pressure monitoring and control unit comprises a pressure gauge for detecting the outlet pressure of the mud pump and a third discharge valve for adjusting the opening size based on the pressure value detected by the pressure gauge to control the outlet pressure of the mud pump.

[0021] The embodiment of the utility model has the advantages that:

[0022] The material storage tank of the embodiment of the application is used for storing the stable solid-liquid mixture of nylon 6 chips and water; the discharge control unit stabilizes the water level of the material storage tank. The components associated with the centrifugal dehydrator, the gas-liquid separation tank, the water storage tank and the like each perform its own function, realizing water resource recycling, gas phase pressure balance and liquid level stabilization. The whole system can enable the nylon 6 chips to be smoothly, efficiently and energy-savingly conveyed from a low position to a high position, laying a solid foundation for efficient and stable production of nylon 6 polymerization, and having great industrial application value. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or related technologies, the drawings needed to be used in the embodiment or related technology description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0024] Figure 1 It is a structural block diagram of the solid-liquid mixture material conveying system of the utility model;

[0025] Figure 2 It is a top view structural schematic diagram of the water distribution ring of the utility model.

[0026] The drawings are as follows: 1, material storage tank; 2, feed inlet; 3, first discharge valve; 4, first regulating valve; 5, first liquid level meter; 6, first backwater pipe; 7, water distribution ring; 8, second liquid level meter; 9, third liquid level meter; 10, second discharge valve; 11, first overflow port; 12, mud pump; 13, pressure gauge; 14, third discharge valve; 15, discharge pipe; 16, centrifugal dehydrator; 17, discharge port; 18, liquid return pipe; 19, gas-liquid separation tank; 20, second backwater pipe; 21, balance pipe; 22, water storage tank; 23, water outlet valve; 24, water outlet pipe; 25, second regulating valve; 26, fourth liquid level meter; 27, second overflow port. DETAILED DESCRIPTION

[0027] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0028] It is to be understood that various alterations and modifications can be made to the embodiments disclosed herein. Therefore, the above description should not be taken as limiting, but merely as exemplification of the embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.

[0029] The accompanying drawings incorporated in and forming a part of the specification illustrate embodiments of the present application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0030] These and other characteristics of the present application will become apparent from the following description and appended claims, taken in conjunction with the accompanying drawings.

[0031] It should also be understood that, although the terms "first" and "second" are used herein to describe various elements and regions, these elements and regions should not be limited by these terms. These terms are only used to distinguish one element / region from another element / region.

[0032] The above and other aspects, features, and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

[0033] Specific embodiments of the present application are described hereinbelow, with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present application, which can be implemented in numerous ways. Well-known and / or redundant functions and structures are not described in detail to avoid obscuring the present application unnecessarily. Therefore, specific structural and functional details disclosed herein are not intended to limit the present application, but merely as a basis for the claims and a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriate detailed structure.

[0034] The specification can use phrases such as "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", which can refer to one or more of the same or different embodiments of the application.

[0035] To solve the problems in the background art, embodiments of the present application provide a solid-liquid mixed material conveying system, the solid-liquid mixed material being a mixture of nylon 6 chips and water.

[0036] In combination Figure 1 The solid-liquid mixed material conveying system comprises:

[0037] The material storage tank 1 is used for storing solid-liquid mixture, and the proportion of the solid-liquid mixture and the water level in the tank is relatively constant. That is, the material storage tank 1 is used for storing nylon 6 chips, and a certain amount of nylon 6 chips can be stored in the material storage tank 1. In the tank, the nylon 6 chips form a mixture with water, and the proportion of the nylon 6 chips and the water level in the tank is relatively constant. The taper angle of the middle part of the material storage tank 1 can be about 150°, which can better ensure the flow balance of the nylon 6 chips in the material storage tank 1.

[0038] The feed inlet 2 is arranged at the top of the material storage tank 1 and is used for the solid material (nylon 6 chips) to enter the material storage tank 1.

[0039] The discharge control unit is connected with the material storage tank 1 and is used for controlling the discharge of the material storage tank 1 based on the liquid level of the material storage tank 1.

[0040] The gas-liquid separation tank 19 includes the gas-liquid separation tank 19, the first water return pipe 6 connected with the gas-liquid separation tank 19, the second water return pipe 20, and the balance pipe 21, and is used for realizing gas-liquid separation and water distribution. The first water return pipe 6 is connected with the material storage tank 1. The gas-liquid separation tank 19 is connected with the first water return pipe 6, the liquid return pipe 18, the second water return pipe 20, and the balance pipe 21, and is used for realizing gas-liquid separation and water distribution in cooperation with the first regulating valve 4.

[0041] The discharge control unit includes the first discharge valve 3, which is arranged at one end of the discharge pipe 15 close to the material storage tank 1 and is in a normally open state, and is in a closed state when the solid-liquid mixture conveying system stops running or is abnormally maintained. The first discharge valve 3 is used for controlling the discharge of the material in the material storage tank 1, and can be closed for process maintenance when the process is abnormal.

[0042] The discharge control unit further includes the first liquid level meter 5 and the first regulating valve 4. The first liquid level meter 5 is arranged on the material storage tank 1 and is used for detecting the liquid level of the material storage tank 1. The first regulating valve 4 can be arranged on the first water return pipe 6. When the first liquid level meter 5 detects that the liquid level in the material storage tank 1 decreases to the first target liquid level, the opening degree of the first regulating valve 4 increases, so that the water in the gas-liquid separation tank 19 can enter the material storage tank 1 through the first water return pipe 6. The first regulating valve 4 and the first liquid level meter 5 form a loop and adjust and control the water level balance of the material storage tank 1. The first regulating valve 4 and the first liquid level meter 5 constitute a closed-loop control system, which adjusts the opening degree of the first regulating valve 4 in real time according to the feedback of the liquid level signal, and maintains the water level of the material storage tank 1 and the water storage tank 22 stable. The gas-liquid separation tank 19 realizes gas-liquid separation by using the principle of gravity, and the balance pipe 21 ensures that the gas phase pressure of the gas-liquid separation tank 19 and the water storage tank 22 is balanced, thereby ensuring stable operation of the system.

[0043] The discharge control unit further comprises a second liquid level meter 8, a third liquid level meter 9 and a second discharge valve 10. The second discharge valve 10 is arranged on the discharge pipe 15 between the material storage tank 1 and the slurry pump 12. When the second liquid level meter 8 detects that the liquid level of the material storage tank 1 reaches the second target liquid level, the opening of the second discharge valve 10 is increased to increase the discharge speed of the material storage tank 1. When the second liquid level meter 8 contacts the nylon 6 chips, it indicates that the material level of the material storage tank 1 is high, and sends a signal to the second discharge valve 10 to adjust the discharge speed to stabilize the material level.

[0044] When the third liquid level meter 9 detects that the liquid level of the material storage tank 1 drops to the third target liquid level, the opening of the second discharge valve 10 is reduced to reduce the discharge speed of the material storage tank 1. When the third liquid level meter 9 cannot contact the material, it indicates that the material level of the material storage tank 1 is too low, and sends a low-level signal and interlocks the star-shaped discharge valve to stop discharging, preventing the chips from being too small to be well extracted.

[0045] The second liquid level meter 8 and the third liquid level meter 9 are used to measure the material level in the material storage tank 1. When the second liquid level meter 8 contacts the nylon 6 chips, it sends an adjustment signal and forms a loop with the second discharge valve 10 to adjust and control the material level of the material storage tank 1 to be relatively stable. When the third liquid level meter 9 cannot contact the material, it sends a low-level signal and interlocks the second discharge valve 10 to stop discharging, to control the discharge speed of the material storage tank 1 to prevent the problem of blocking the slurry pump 12. At the same time, a part of the nylon 6 chips can be stored in the material storage tank 1 when the process is abnormal, to avoid shutdown.

[0046] The second discharge valve 10 can be, but is not limited to, a star-shaped discharge valve. The star-shaped discharge valve and the discharge pipe 15 between the slurry pump 12 can be connected by a large-radius elbow to reduce flow resistance.

[0047] The upper part of the side of the material storage tank 1 can be provided with a first overflow port 11. When the liquid level in the material storage tank 1 is too high and loses control, the excess water can flow out of the first overflow port 11 and be discharged into a sewage pool.

[0048] The power delivery unit includes a discharge pipe 15 and a slurry pump 12 arranged on the discharge pipe 15. One end of the discharge pipe 15 is connected to the material storage tank 1, and the power delivery unit provides power for delivering the solid-liquid mixture. The slurry pump 12 is the power source for delivering the chips. The discharge pipe 15 connects the slurry pump 12 with the dewatering unit described below. The discharge pipe 15 can be internally polished to reduce scratching of the nylon 6 chips.

[0049] A dewatering unit is connected to the other end of the discharge pipe 15 to dewater the solid-liquid mixture from the material storage tank 1, and the dewatering unit is also connected to a gas-liquid separation tank 19 through a backwater pipe 18 to deliver the separated water to the gas-liquid separation tank 19. The dewatering unit can be a centrifugal dewatering machine 16. The dewatering unit can be positioned at a higher level than the material storage tank 1. The discharge port 17 of the centrifugal dewatering machine 16 is connected to the discharge pipe 15 of the extraction tower.

[0050] A pressure monitoring and control unit is arranged on the discharge pipe 15 and used to monitor the pressure during the delivery of the solid-liquid mixture to control the outlet pressure of the slurry pump 12.

[0051] The pressure monitoring and control unit includes a pressure gauge 13 and a third discharge valve 14. The pressure gauge 13 is used to detect the outlet pressure of the slurry pump 12, and the third discharge valve 14 adjusts the opening size based on the pressure value detected by the pressure gauge 13 to control the outlet pressure of the slurry pump 12. The pressure gauge 13 is used to check whether the delivery of the nylon 6 chips is normal. The third discharge valve 14 is used to control the outlet pressure of the pump to prevent the equipment from running overload.

[0052] A water storage tank 22 is connected to the second backwater pipe 20 and the balance pipe 21 respectively and receives the backwater from the gas-liquid separation tank 19. The balance pipe 21 is used to balance the pressure between the water storage tank 22 and the gas-liquid separation tank 19. One end of the balance pipe 21 communicates with the top of the gas-liquid separation tank 19, and the other end of the balance pipe 21 communicates with the top of the water storage tank 22 to balance the pressure between the water storage tank 22 and the gas-liquid separation tank 19. A second overflow port 27 can be arranged on the water storage tank 22, which can be used to flow out the excess water when the water in the water storage tank 22 is out of control and be discharged to a sewage pool.

[0053] The second backwater pipe 20 is mainly used for the backflow of the delivery water of the water storage tank 22. The second backwater pipe 20 is inserted below the liquid level of the water storage tank 22 to make the water flow more stable.

[0054] The water storage tank 22 stores water and supplements the water for the delivery process of the solid-liquid mixture. For example, a water outlet pipe 24 is arranged between the water storage tank 22 and the second discharge valve 10, and a water outlet valve 23 is arranged on the water outlet pipe 24. The water storage tank 22 delivers water to the second discharge valve 10 through the water delivery pipe 24. The water outlet valve 23 is used to control the delivery water in the water storage tank 22, and the valve can be closed for maintenance when the equipment is abnormal. The water outlet pipe 24 is used to connect the water storage tank 22 and the second discharge valve 10 to supplement the delivery water for the delivery of the chips.

[0055] The water inlet pipe is connected with the water storage tank 22 and transports the desalted water to the water storage tank 22. The solid-liquid mixture material conveying system further comprises a fourth liquid level meter 26 and a second regulating valve 25. The fourth liquid level meter 26 is arranged on the water storage tank 22 and is used for detecting the liquid level of the water storage tank 22. The fourth liquid level meter 26 is interconnected with the second connecting valve. The second regulating valve 25 is arranged on the water inlet pipe and adjusts the opening degree according to the detection result of the fourth liquid level meter 26. The fourth liquid level meter 26 is used for measuring the water level in the water storage tank 22. The second regulating valve 25 and the fourth liquid level meter 26 form a loop to adjust and control the conveying water level in the water storage tank 22 to be relatively stable, so as to supplement the water absorbed by the nylon 6 chips in the production process.

[0056] The solid-liquid mixture material conveying system further comprises a water distribution ring 7 arranged on the inner wall of the material storage tank 1 and used for distributing the water flowing back to the material storage tank 1, so that the water flows downward along the inner wall of the material storage tank 1 and prevents the water from flowing too fast to impact the nylon 6 chips in the material storage tank 1 and break the normal laminar flow of the chips. For example, the water distribution ring 7 is annularly welded downward to the outlet in the tank. Figure 2 The water flows downward along the tank wall, which can effectively eliminate the problem of slow flow of the edge chips and avoid the water flow impacting the newly entered nylon 6 chips.

[0057] The above-mentioned various valves and liquid level meters can be connected with a control system. The control system can adjust the opening degree or on-off of the valves according to various detection signals. The control system can be but is not limited to a distributed control system. According to the real-time liquid level data fed back by the liquid levels and liquid level meters, the control system uses a control algorithm to accurately control the opening degree of the corresponding valves, so as to accurately and dynamically control the conveying of the nylon 6 chips from the low position to the high position, ensure the stability of the nylon 6 chip level and the water level in the material storage tank 1, and ensure the stability of the water level in the water storage tank 22, thereby effectively guaranteeing the efficiency and stability of the nylon 6 polymerization production. The problem of unstable low position and easy blockage of the mud pump 12 is effectively solved, the production continuity is ensured, the economic loss caused by equipment failure shutdown is greatly reduced, and the smooth operation of the nylon 6 production process is ensured. Compared with the water jet pump conveying process, the present innovative process realizes a major breakthrough in energy saving and consumption reduction, reduces unnecessary energy consumption through optimized component design and collaborative working mode, fits the current development trend of low carbon and environmental protection, reduces the production cost of enterprises, and helps sustainable development.

[0058] The above-mentioned various valves and liquid level meters can be connected with a control system. The control system can adjust the opening degree or on-off of the valves according to various detection signals. The control system can be but is not limited to a distributed control system. According to the real-time liquid level data fed back by the liquid levels and liquid level meters, the control system uses a control algorithm to accurately control the opening degree of the corresponding valves, so as to accurately and dynamically control the conveying of the nylon 6 chips from the low position to the high position, ensure the stability of the nylon 6 chip level and the water level in the material storage tank 1, and ensure the stability of the water level in the water storage tank 22, thereby effectively guaranteeing the efficiency and stability of the nylon 6 polymerization production. The problem of unstable low position and easy blockage of the mud pump 12 is effectively solved, the production continuity is ensured, the economic loss caused by equipment failure shutdown is greatly reduced, and the smooth operation of the nylon 6 production process is ensured. Compared with the water jet pump conveying process, the present innovative process realizes a major breakthrough in energy saving and consumption reduction, reduces unnecessary energy consumption through optimized component design and collaborative working mode, fits the current development trend of low carbon and environmental protection, reduces the production cost of enterprises, and helps sustainable development.

[0058] The above-mentioned various valves and liquid level meters can be connected with a control system. The control system can adjust the opening degree or on-off of the valves according to various detection signals. The control system can be but is not limited to a distributed control system. According to the real-time liquid level data fed back by the liquid levels and liquid level meters, the control system uses a control algorithm to accurately control the opening degree of the corresponding valves, so as to accurately and dynamically control the conveying of the nylon 6 chips from the low position to the high position, ensure the stability of the nylon 6 chip level and the water level in the material storage tank 1, and ensure the stability of the water level in the water storage tank 22, thereby effectively guaranteeing the efficiency and stability of the nylon 6 polymerization production. The problem of unstable low position and easy blockage of the mud pump 12 is effectively solved, the production continuity is ensured, the economic loss caused by equipment failure shutdown is greatly reduced, and the smooth operation of the nylon 6 production process is ensured. Compared with the water jet pump conveying process, the present innovative process realizes a major breakthrough in energy saving and consumption reduction, reduces unnecessary energy consumption through optimized component design and collaborative working mode, fits the current development trend of low carbon and environmental protection, reduces the production cost of enterprises, and helps sustainable development.

Claims

1. A solid-liquid mixture material conveying system characterized by, The application relates to a solid-liquid mixture conveying system. The system comprises: a material storage tank for storing a solid-liquid mixture, and the proportion of the solid-liquid mixture and the water level in the tank is relatively constant; a feeding port arranged on the top of the material storage tank for feeding solid materials into the material storage tank; a discharge control unit connected with the material storage tank for controlling the discharge of the material storage tank based on the liquid level of the material storage tank; a gas-liquid separation tank comprising a gas-liquid separation tank and a first water return pipe, a second water return pipe and a balance pipe connected with the gas-liquid separation tank, for realizing gas-liquid separation and water distribution, and the first water return pipe is connected with the material storage tank; a power conveying unit comprising a discharge pipe and a slurry pump arranged on the discharge pipe, one end of the discharge pipe is connected with the material storage tank, and the power conveying unit provides power for conveying the solid-liquid mixture; a dehydration unit connected with the other end of the discharge pipe for dehydrating the solid-liquid mixture from the material storage tank, and the dehydration unit is also connected with the gas-liquid separation tank through a liquid return pipe for conveying the separated water to the gas-liquid separation tank; a pressure monitoring and control unit arranged on the discharge pipe for monitoring the pressure in the process of conveying the solid-liquid mixture, so as to control the outlet pressure of the slurry pump; a water storage tank connected with the second water return pipe and the balance pipe respectively, and receiving the water returned from the gas-liquid separation tank, the balance pipe is used for balancing the pressure of the water storage tank and the gas-liquid separation tank; the water storage tank stores water and replenishes water for the conveying process of the solid-liquid mixture; 2. The solid-liquid mixture conveying system according to claim 1, wherein: a water inlet pipe connected with the water storage tank and conveying desalinated water to the water storage tank.

3. The solid-liquid mixture conveying system of claim 1, wherein: The discharge control unit comprises a first discharge valve arranged on one end of the discharge pipe close to the material storage tank, and the first discharge valve is in an open state and in a closed state when the solid-liquid mixture conveying system stops running or is abnormally maintained.

4. The solid-liquid mixture delivery system of claim 1, wherein: The discharge control unit further comprises a first liquid level meter arranged on the material storage tank and used for detecting the liquid level of the material storage tank, and a first regulating valve arranged on the first water return pipe, when the first liquid level meter detects that the liquid level in the material storage tank drops to a first target liquid level, the opening degree of the first regulating valve is increased, so that the water in the gas-liquid separation tank can enter the material storage tank through the first water return pipe.

5. The solid-liquid mixture delivery system of claim 1, wherein: The discharge control unit further comprises a second liquid level meter, a third liquid level meter and a second discharge valve arranged on the discharge pipe between the material storage tank and the slurry pump, when the second liquid level meter detects that the liquid level of the material storage tank reaches a second target liquid level, the opening degree of the second discharge valve is increased to increase the discharge speed of the material storage tank, and when the third liquid level meter detects that the liquid level of the material storage tank drops to a third target liquid level, the opening degree of the second discharge valve is reduced to reduce the discharge speed of the material storage tank. The solid-liquid mixture conveying system further comprises a water distribution ring arranged on the inner wall of the material storage tank for distributing the water returned to the material storage tank, so that the water flows downward along the inner wall of the material storage tank.

6. The solid-liquid mixture delivery system of claim 1, wherein: The solid-liquid mixture conveying system further comprises a fourth liquid level meter and a second regulating valve, the fourth liquid level meter is arranged on the water storage tank and used for detecting the liquid level of the water storage tank, and the fourth liquid level meter is interconnected with the second regulating valve; the second regulating valve is arranged on the water inlet pipe and adjusts the opening degree according to the detection result of the fourth liquid level meter.

7. The solid-liquid mixture conveying system of claim 4, wherein: A water outlet pipe is arranged between the water storage tank and the second discharge valve, a water outlet valve is arranged on the water outlet pipe, and the water storage tank conveys water to the second discharge valve through the conveying water outlet pipe.

8. The solid-liquid mixture delivery system of claim 1, wherein: The pressure monitoring and control unit comprises a pressure gauge and a third discharge valve, the pressure gauge is used for detecting the outlet pressure of the mud pump, and the third discharge valve adjusts the opening degree based on the pressure value detected by the pressure gauge to control the outlet pressure of the mud pump.

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