Mine water TMF pretreatment dosing system

Abstract

The utility model provides a mine water TMF pretreatment dosing system which comprises a concentrated brine tank, a softening tank, a medicament storage device, a dosing pump, a TMF concentration tank, a TMF integration device, a TMF water production tank and a PLC control module, the concentrated brine tank is connected with the softening tank through a water inlet pump, a water inlet pipe of the softening tank is provided with a water inlet detection device, and a water outlet pipe of the softening tank is provided with a water outlet detection device; the softening tank is connected with a medicament storage device through a dosing pump, the softening tank is connected with a TMF concentration tank through a pipeline, the TMF concentration tank is connected with a TMF integration device through a circulating pump, the TMF integration device is connected with a TMF water producing tank through a water outlet pipe, and a water outlet detection device is arranged on the water outlet pipe. The PLC control module is electrically connected with the dosing pump, the inlet water detection device, the outlet water detection device, the softening pool pH meter and the TMF water production pool pH meter, optimal control over the dosing amount according to the indexes of the inlet water amount, the alkalinity, the calcium ion concentration and the magnesium ion concentration is achieved in a feed-forward and feed-backward combined mode, and optimal control over the TMF softening and hardness removing dosing system is completed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of mine water softening and hardness removal, and particularly relates to a mine water TMF pretreatment dosing system. BACKGROUND

[0002] A large amount of mine water is generated in the mining process of coal mines, and the mine water contains not only a large amount of coal powder, suspended solids, oils and the like, but also various salts. It is a trend of mine water pollution treatment to realize resource utilization of mine water by zero discharge treatment of high salinity mine water.

[0003] Tubular microfiltration membrane (TMF) plays an important role in zero discharge treatment of coal mine water, is an important pretreatment process, and can well realize softening and hardness removal, turbidity removal pretreatment function, and provide protection for stable operation of a subsequent multi-stage membrane concentration and evaporation salt crystallization system.

[0004] The premise of successful operation of the tubular microfiltration membrane (TMF) is stable operation of a reagent dosing and reaction system at the front end, and reasonable selection of reagent types and reagent dosing amounts is of great significance to stable operation of the TMF system, saving of reagents, and energy saving and consumption reduction. At present, the dosing device has low automation, and dosing amounts of various reagents are often determined according to experience, which cannot adapt to changes in pollution indexes in incoming water, leads to inaccurate control of dosing amounts, causes the dosing amounts of reagents to be high or low, and has great manual labor intensity, and affects the operation effect of the TMF system. In order to solve this problem, the utility model provides a mine water TMF softening and hardness removal intelligent dosing reaction unit dosing system, and aims to improve the automation level of the pretreatment dosing device of the TMF system and accurate control of reagent dosing. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the defects in the prior art, and proposes an improved scheme or a replacement scheme, in particular, a TMF softening and hardness removal reagent dosing system used after nanofiltration concentrated brine in a mine water membrane method salt separation process, solves the problems of inaccurate dosing amounts of reagents and unstable hardness removal of the TMF system, improves the dosing automation level of the TMF softening and hardness removal system, realizes accurate dosing and energy saving and consumption reduction of the TMF system, and provides a mine water TMF pretreatment dosing system.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme: a mine water TMF pretreatment dosing system, characterized by comprising: a concentrated brine pool, a softening pool, a reagent storage device, a dosing pump, a TMF concentration pool, a TMF integrated device, a TMF water production pool and a PLC control module.

[0007] The concentrated brine pool is connected with the softening pool through a water inlet pump, a water inlet detection device is arranged on a water inlet pipe at one side of the softening pool, the softening pool is connected with a medicament storage device through a dosing pump, the softening pool is connected with a TMF concentration pool through a pipeline, the TMF concentration pool is connected with a TMF integrated device through a circulating pump, and the TMF integrated device is connected with a TMF water production pool through a water outlet pipe, wherein a water outlet detection device is arranged on the water outlet pipe.

[0008] The PLC control module is electrically connected with the dosing pump, the water inlet detection device, the water outlet detection device, a softening pool pH meter and a TMF water production pool pH meter respectively.

[0009] Further, the softening pool comprises a first-stage softening pool and a second-stage softening pool.

[0010] The first-stage softening pool is connected with the second-stage softening pool through a pipeline, and a softening pool stirrer is arranged in the first-stage softening pool and the second-stage softening pool.

[0011] Further, the medicament storage device comprises a lime milk storage device, a liquid alkali storage device, a soda ash storage device and a sulfuric acid storage device.

[0012] The lime milk storage device and the liquid alkali storage device are connected with the first-stage softening pool through dosing pumps respectively, the liquid alkali storage device and the soda ash storage device are connected with the second-stage softening pool through dosing pumps respectively, and the sulfuric acid storage device is connected with a water outlet pipe of the TMF integrated device through a dosing pump.

[0013] Further, the softening pool pH meter comprises a first-stage softening pool pH meter and a second-stage softening pool pH meter, the first-stage softening pool pH meter is installed in the first-stage softening pool in an immersion installation mode, and the second-stage softening pool pH meter is installed in the second-stage softening pool in an immersion installation mode.

[0014] Further, the dosing pump is a variable frequency metering pump.

[0015] Further, the bottom end of the TMF concentration pool is also connected with a sludge discharge pump through a pipeline.

[0016] Further, a backflow pipe is arranged on the TMF integrated device, for backflowing sludge separated from the TMF integrated device into the TMF concentration pool.

[0017] Further, the water inlet detection device comprises a water inlet electromagnetic flowmeter, a water inlet pH meter, a water inlet online alkalinity instrument, a water inlet online calcium ion instrument and a water inlet online magnesium ion instrument.

[0018] The inlet electromagnetic flow meter, inlet pH meter, inlet online alkalinity meter, inlet online calcium ion meter, and inlet online magnesium ion meter are sequentially installed on the inlet pipe on one side of the softening tank and are electrically connected to the PLC control module respectively.

[0019] Furthermore, the effluent detection device includes an online alkalinity meter, an online calcium ion meter, and an online magnesium ion meter.

[0020] The online alkalinity meter, online calcium ion meter, and online magnesium ion meter are installed sequentially on the water outlet pipe and are electrically connected to the PLC control module respectively.

[0021] Furthermore, the pH meter for the TMF product water tank is installed inside the TMF product water tank using an immersion installation method.

[0022] Beneficial effects: This utility model achieves optimized control of the dosage based on the influent water volume, alkalinity, calcium ion concentration, and magnesium ion concentration through a combination of feedforward and feedback methods. It completes the optimized control of the TMF softening and hardening dosing system, ensures stable water quality of the TMF integrated device, improves the automation level of the TMF softening and hardening system, and achieves precise dosing and energy saving and consumption reduction of the TMF system. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the present invention.

[0024] In the diagram: 1. Concentrated brine tank; 2. TMF thickener tank; 3. TMF integrated unit; 4. TMF product water tank; 5. PLC control module; 6. Inlet pump; 7. Primary softening tank; 8. Secondary softening tank; 9. Lime slurry storage device; 11. Liquid alkali storage device; 12. Soda ash storage device; 13. Sulfuric acid storage device; 14. Circulation pump; 15. TMF product water tank pH meter; 16. Primary softening tank pH meter; 17. Secondary softening tank pH meter; 18. Sludge pump; 19. Return pipe; 20. Inlet electromagnetic flow meter; 21. Inlet pH meter; 22. Inlet online alkalinity meter; 23. Inlet online calcium ion meter; 24. Inlet online magnesium ion meter; 25. Outlet online alkalinity meter; 26. Outlet online calcium ion meter; 27. Outlet online magnesium ion meter. Detailed Implementation

[0025] The present invention will be further explained below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, this utility model provides a mine water TMF pretreatment dosing system, including: a concentrated brine tank 1, a softening tank, a reagent storage device, a dosing pump, a TMF concentration tank 2, a TMF integrated device 3, a TMF product water tank 4, and a PLC control module 5.

[0027] The concentrated brine pool 1 is connected with the softening pool through the water inlet pump 6, the water inlet pipe on one side of the softening pool is provided with a water inlet detection device, the softening pool is connected with the medicament storage device through the dosing pump, the softening pool is connected with the TMF concentration pool 2 through the pipeline, the TMF concentration pool 2 is connected with the TMF integrated device 3 through the circulating pump 14, the TMF integrated device 3 is provided with a backflow pipe 19, the TMF integrated device 3 is connected with the TMF water production pool 4 through the water outlet pipe, the water outlet pipe is provided with a water outlet detection device, and the bottom end of the TMF concentration pool 2 is also connected with the sludge discharge pump 18 through the pipeline.

[0028] The PLC control module 5 is electrically connected with the dosing pump, the water inlet detection device, the water outlet detection device, the softening pool pH meter and the TMF water production pool pH meter 15 respectively.

[0029] The softening pool includes the first-stage softening pool 7 and the second-stage softening pool 8, the first-stage softening pool 7 is connected with the second-stage softening pool 8 through the pipeline, the first-stage softening pool 7 and the second-stage softening pool 8 are provided with softening pool stirrers, and the softening pool pH meter includes the first-stage softening pool pH meter 16 and the second-stage softening pool pH meter 17, the first-stage softening pool pH meter 16 is installed in the first-stage softening pool 7 in an immersion installation mode, the second-stage softening pool pH meter 17 is installed in the second-stage softening pool 8 in an immersion installation mode, the first-stage softening pool pH meter 16 is used for monitoring the pH of the concentrated brine after a dosing reaction in the first-stage softening pool 7 in real time, and the pH data of the first-stage softening reaction pool are transmitted to the PLC control module 5 for storage and recording in real time, and the second-stage softening pool pH meter 17 is used for monitoring the pH of the concentrated brine after a dosing reaction in the second-stage softening pool 8 in real time, and the pH data of the second-stage softening reaction pool are transmitted to the PLC control module 5 for storage and recording in real time.

[0030] The medicament storage device includes the lime milk storage device 9, the liquid alkali storage device 11, the soda ash storage device 12 and the sulfuric acid storage device 13, the lime milk storage device 9 and the liquid alkali storage device 11 are connected with the first-stage softening pool 7 through the dosing pump respectively, the liquid alkali storage device 11 and the soda ash storage device 12 are connected with the second-stage softening pool 8 through the dosing pump respectively, the sulfuric acid storage device 13 is connected with the water outlet pipe of the TMF integrated device 3 through the dosing pump, the dosing pump includes the lime milk dosing pump, the liquid alkali dosing pump, the soda ash dosing pump and the sulfuric acid dosing pump, the lime milk storage device 9 delivers the lime milk solution to the first-stage softening pool 7 through the lime milk dosing pump and the pipeline, the liquid alkali storage device 11 delivers the liquid alkali to the first-stage softening pool 7 and the second-stage softening pool 8 through the liquid alkali dosing pump and the pipeline respectively, the soda ash storage device 12 delivers the soda ash aqueous solution to the second-stage softening pool 8 through the soda ash dosing pump and the pipeline, and the sulfuric acid storage device 13 delivers the sulfuric acid to the water production pipeline of the TMF integrated device 3 and into the TMF water production pool 4 through the sulfuric acid dosing pump and the pipeline, and the sulfuric acid is fully mixed and reacted with the produced water to realize the pH adjustment of the TMF water production pool 4.

[0031] The water inlet detection device comprises a water inlet electromagnetic flowmeter 20, a water inlet pH meter 21, a water inlet on-line alkalinity meter 22, a water inlet on-line calcium ion meter 23 and a water inlet on-line magnesium ion meter 24, which are sequentially installed on the water inlet pipe at the side of the softening tank and are respectively electrically connected with the PLC control module 5. The water inlet detection device is used for real-time water quality monitoring of the concentrated brine and real-time transmission of the water quality monitoring data to the PLC control module 5 for storage and recording.

[0032] The water outlet detection device comprises a water outlet on-line alkalinity meter 25, a water outlet on-line calcium ion meter 26 and a water outlet on-line magnesium ion meter 27, which are sequentially installed on the water outlet pipe and are respectively electrically connected with the PLC control module 5, for real-time monitoring of the residual alkalinity, calcium ion and magnesium ion in the TMF produced water and transmission of the above water quality data to the PLC control module 5.

[0033] In the embodiment, the PLC control module 5 adopts a Siemens S7-1200 series controller, the lime milk dosing pump adopts a frequency conversion metering pump, preferably a screw metering pump, the frequency conversion control; the caustic soda dosing pump adopts a frequency conversion metering pump; the soda ash dosing pump adopts a frequency conversion metering pump; and the sulfuric acid dosing pump adopts a frequency conversion metering pump.

[0034] The TMF produced water tank pH meter 15, the primary softening tank pH meter 16, the secondary softening tank pH meter 17, the water inlet electromagnetic flowmeter 20, the water inlet pH meter 21, the water inlet on-line alkalinity meter 22, the water inlet on-line calcium ion meter 23, the water inlet on-line magnesium ion meter 24, the water outlet on-line alkalinity meter 25, the water outlet on-line calcium ion meter 26 and the water outlet on-line magnesium ion meter 27 on the dosing system all work independently and are not affected by each other, respectively collect water quality data, monitor the water quality indexes of the process sections and convert the measured physical signals into electric signals and then upload to the PLC control module 5 through a low-voltage circuit.

[0035] The primary softening tank pH meter 16 in the primary softening tank 7 measures the pH of the mixed solution in the primary softening tank 7 in real time, transmits the data to the PLC control module 5, compares with the preset pH control target recommended value 10-10.3 of the primary softening tank 7 in the PLC control module 5, when deviating from the target, the PLC control module 5 sends operation instructions to the lime milk dosing pump or the caustic soda dosing pump to timely adjust the operation frequency of the above dosing pump and then adjust the dosing amount, until the pH of the primary softening tank 7 is stabilized at the control target of 10-10.3.

[0036] The pH of the mixed solution in the secondary softening tank 8 is measured in real time by a secondary softening tank pH meter 17 in the secondary softening tank 8, and the data is transmitted to the PLC control module 5, and compared with the preset pH control target recommendation value 10.5-11 of the secondary softening tank 8 in the PLC control module 5, when deviating from the target, the PLC control module 5 sends an operation instruction to the liquid caustic soda dosing pump to timely adjust the operation frequency of the liquid caustic soda dosing pump and then adjust the dosing amount, until the pH of the secondary softening tank 8 is stabilized at 10.5-11 control target.

[0037] The residual alkalinity, calcium ion and magnesium ion in the TMF water production tank 4 are monitored in real time by an outlet water online alkalinity instrument 25, an outlet water online calcium ion instrument 26 and an outlet water online magnesium ion instrument 27 in the TMF integrated device 3 water production main pipe, and the above water quality data are transmitted to the PLC control module 5, and compared with the preset TMF water production index in the PLC control module 5, so that the Ca 2+ <15mg / L, Mg 2+ <20mg / L, SiO2<20mg / L and residual alkalinity value 1-1.5mmol / L, if the water quality measured by the above instruments deviates from the above preset target, the dosing pump corresponding to the above exceeding index needs to be adjusted according to the preset program in the PLC control module 5.

[0038] The flow, pH, alkalinity, calcium ion and magnesium ion in the inlet water are monitored in real time by an inlet water electromagnetic flow meter 20, an inlet water pH meter 21, an inlet water online alkalinity instrument 22, an inlet water online calcium ion instrument 23 and an inlet water online magnesium ion instrument 24 in the inlet pipe of the softening tank, and the above water quality data are transmitted to the PLC control module 5, the PLC control module 5 compares the relationship between the inlet water alkalinity and hardness according to the preset program, selects the type of dosing agent, adjusts the dosing amount of the agent according to the above water quality data, and the PLC control module 5 adjusts the operation frequency of the dosing pump according to the Ca 2+ <15mg / L, Mg 2+ <20mg / L, SiO2<20mg / L and residual alkalinity value 1-1.5mmol / L control target, and the dosing amount of the agent is adjusted according to the proportion, an output instruction is output, and the operation frequency of the dosing pump is adjusted, so that the continuous control of the dosing amount is realized.

[0039] The working process of the utility model is:

[0040] Firstly, the concentrated brine is collected in the concentrated brine tank 1, then after adjusting the water quality and water volume, the concentrated brine is quantitatively lifted into the primary softening tank 7 by the inlet water pump 6, after the type of the required dosing agent is judged by the PLC control module 5, one or two kinds of agents in lime milk and liquid caustic soda are added, then the concentrated brine and the agent are fully reacted, and the concentrated brine and the agent are fully reacted.

[0041] Then, in the secondary softening tank 8, the PLC control module judges the reasonable dosage of liquid caustic soda and soda ash, and the concentrated brine and the medicament are fully reacted and flow into the TMF concentration tank 2, in the TMF concentration tank, the high-concentration sludge mixed by the concentrated brine, the sludge containing calcium and magnesium ions generated by the primary softening tank and the secondary softening tank, and the concentrated sludge returned by the TMF integrated device 3 is sent into the TMF integrated device 3 by the circulating pump 14, and the high-concentration suspended matter of the concentrated brine and the sludge containing calcium and magnesium is physically filtered by the TMF tubular microfiltration membrane of the TMF integrated device 3 to realize sludge-water separation, and the produced clear liquid is discharged to the TMF water production tank 4 for use.

[0042] Finally, the concentrated sludge is discharged to the TMF concentration tank 2 through the return pipe 19, and the concentrated brine containing calcium and magnesium sludge from the secondary softening tank 8 is fully mixed to maintain a reasonable sludge concentration, and when the sludge concentration in the TMF concentration tank 2 exceeds the set target value, the sludge in the TMF concentration tank 2 is discharged by the sludge pump 18.

[0043] The utility model discloses a feedforward combination behind the way of realizing the optimization control of dosing according to the water quantity, alkalinity, calcium ion concentration and magnesium ion concentration, completes the optimization control of TMF softening and hardening dosing system, ensures that TMF integrated device produces water and realizes stable water quality, improves TMF softening and hardening system dosing automation level, realizes accurate dosing and TMF system's energy saving and cost reduction.

[0044] The above only is the preferred implementation mode of the utility model, should point out, for ordinary skill for the technical field, on the premise of not departing from the principle of the utility model, can also make a number of improvements and refinements, these improvements and refinements also should be regarded as the protection range of the utility model.

Claims

1. A mine water TMF pre-treatment dosing system, characterized in that, The application relates to a water treatment system, which comprises a concentrated brine pool (1), a softening pool, a medicament storage device, a dosing pump, a TMF concentration pool (2), a TMF integrated device (3), a TMF water production pool (4) and a PLC control module (5). The concentrated brine pool (1) is connected with the softening pool through a water inlet pump (6), a water inlet detection device is arranged on a water inlet pipe of one side of the softening pool, the softening pool is connected with the medicament storage device through a dosing pump, the softening pool is connected with the TMF concentration pool (2) through a pipeline, the TMF concentration pool (2) is connected with the TMF integrated device (3) through a circulating pump (14), the TMF integrated device (3) is connected with the TMF water production pool (4) through a water outlet pipe, and a water outlet detection device is arranged on the water outlet pipe. The PLC control module (5) is electrically connected with the dosing pump, the water inlet detection device, the water outlet detection device, a softening pool pH meter and a TMF water production pool pH meter (15). The softening pool comprises a first-stage softening pool (7) and a second-stage softening pool (8).

2. The mine water TMF pretreatment chemical addition system of claim 1, wherein, The first-stage softening pool (7) is connected with the second-stage softening pool (8) through a pipeline, and a softening pool stirrer is arranged in the first-stage softening pool (7) and the second-stage softening pool (8). The medicament storage device comprises a lime milk storage device (9), a liquid alkali storage device (11), a soda ash storage device (12) and a sulfuric acid storage device (13).

3. The mine water TMF pretreatment chemical addition system of claim 2, wherein, The lime milk storage device (9) and the liquid alkali storage device (11) are connected with the first-stage softening pool (7) through dosing pumps respectively, the liquid alkali storage device (11) and the soda ash storage device (12) are connected with the second-stage softening pool (8) through dosing pumps respectively, and the sulfuric acid storage device (13) is connected with the water outlet pipe of the TMF integrated device (3) through a dosing pump. The softening pool pH meter comprises a first-stage softening pool pH meter (16) and a second-stage softening pool pH meter (17), the first-stage softening pool pH meter (16) is installed in the first-stage softening pool (7) in an immersion type, and the second-stage softening pool pH meter (17) is installed in the second-stage softening pool (8) in an immersion type.

4. The mine water TMF pretreatment chemical addition system of claim 2, wherein, The dosing pump is a variable frequency metering pump.

5. The mine water TMF pretreatment chemical addition system of claim 1, wherein, The bottom end of the TMF concentration pool (2) is also connected with a sludge discharge pump (18) through a pipeline.

6. The mine water TMF pretreatment chemical addition system of claim 1, wherein, The TMF integrated device (3) is provided with a backflow pipe (19) for backflowing sludge separated from the TMF integrated device (3) into the TMF concentration pool (2).

7. The mine water TMF pretreatment chemical addition system of claim 1, wherein, The water inlet detection device comprises a water inlet electromagnetic flowmeter (20), a water inlet pH meter (21), a water inlet on-line alkalinity instrument (22), a water inlet on-line calcium ion instrument (23) and a water inlet on-line magnesium ion instrument (24).

8. The mine water TMF pretreatment chemical addition system of claim 1, wherein, The water inlet electromagnetic flowmeter (20), the water inlet pH meter (21), the water inlet on-line alkalinity instrument (22), the water inlet on-line calcium ion instrument (23) and the water inlet on-line magnesium ion instrument (24) are sequentially installed on the water inlet pipe of one side of the softening pool and are electrically connected with the PLC control module (5). The water outlet detection device comprises a water outlet on-line alkalinity instrument (25), a water outlet on-line calcium ion instrument (26) and a water outlet on-line magnesium ion instrument (27).

9. The mine water TMF pretreatment chemical addition system of claim 1, wherein, ​ The water outlet on-line alkalinity instrument (25), water outlet on-line calcium ion instrument (26) and water outlet on-line magnesium ion instrument (27) are sequentially installed on the water outlet pipe and are electrically connected with the PLC control module (5) respectively.

10. The mine water TMF pretreatment chemical addition system of claim 1, wherein, The TMF water production tank pH meter (15) is installed in the TMF water production tank (4) by using an immersion installation mode.

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