Underground movable reverse osmosis water treating equipment and treating process thereof for coal mine

[0032] Example 1

[0033] The movable reverse osmosis water treatment equipment used in underground coal mines of this embodiment includes a programmable controller PLC1. The programmable controller PLC1 is connected to a raw water storage device for storing groundwater through a control circuit, and is used for preprocessing groundwater. A pretreatment device for processing, a pure water storage device for storing pure water, a reverse osmosis device for extracting pure water is installed between the pretreatment device and the pure water storage device; programmable controller PLC1, raw water storage device, pretreatment The device, the reverse osmosis device 18, and the pure water storage device are installed on a movable flat car. A box-shaped cover made of carbon steel and equipped with an observation window is installed on the periphery of the flat car; the raw water storage device includes a coal mine underground water supply pipe The raw water tank 3 is connected with the net 2 and is provided with an electromagnetic ball valve 16. The output end of the raw water tank 3 is connected with a raw water pump 9; the pretreatment device includes a disc filter 10 connected to the raw water pump 9, and a disc filter An electromagnetic three-way ball valve 17 is provided on the device 10, the output end of the disc filter 10 is connected with a dosing device 11 with built-in scale inhibitor and a dosing pump, and the output end of the dosing device 11 is connected with a security filter The output end of the security filter 12 is connected with a pipeline booster pump 13; the reverse osmosis device 18 is a reverse osmosis RO membrane connected with the pipeline booster pump 13, and a reverse osmosis RO membrane is provided on the periphery of the reverse osmosis RO membrane Membrane shell; the pure water storage device includes a pure water tank 14 connected with the reverse osmosis device, the output of the pure water tank 14 is connected with a pure water pump 15; the programmable controller PLC1 is equipped with a solenoid ball valve 16 and an electromagnetic three-way The explosion-proof power box for controlling the opening and closing of the ball valve 17 4, the raw water pump explosion-proof switch for controlling the opening and closing of the raw water pump 9, the explosion-proof switch of the dosing pump used to control the opening and closing of the dosing pump 6, the control line booster pump 13 Open and closed pipeline booster pump explosion-proof switch 7, pure water pump explosion-proof switch used to control the opening and closing of pure water pump 15; raw water tank 3, pure water tank 14, disc filter 10, reverse osmosis device 18 Pressure sensors are installed.

[0034] The treatment process flow of the above-mentioned movable reverse osmosis water treatment equipment for underground coal mine:

[0035] 1. Water production process

[0036] 1) Groundwater is transported to the original water tank 3 through the underground water supply pipe network 2 of the coal mine. When the water level in the original water tank 3 reaches a certain height (the water level is generally controlled at 0.3m-3m according to the actual situation on the spot), then the original water tank 3 The pressure sensor transmits the water level signal to the programmable controller PLC1, and the programmable controller PLC1 automatically sends the start-up signal to the original water pump explosion-proof switch 5, the dosing pump explosion-proof switch 6, and the pipeline booster pump explosion-proof switch 7, thereby removing the original The water pump 9, the dosing pump, and the pipeline booster pump 13 are turned on in sequence.

[0037] 2). Groundwater is transported by the raw water pump 9 to the disc filter 10 for filtration, so that the suspended turbidity of the filtered groundwater is less than 5. At this time, the dosing pump is automatically turned on, and the dosing device 11 is installed The scale inhibitor (such as MDC220) is added to the filtered groundwater, and the filtered groundwater enters the security filter 12 together with the scale inhibitor for filtration, and then is pressurized by the pipeline booster pump 13 (the pressure is generally increased to 1Mpa- -2Mpa), then enter the reverse osmosis device 18. The function of the security filter 12 is to remove ultra-fine particles in the water, as a subsequent auxiliary filtering means of the disc filter 10 to prevent pollution to the reverse osmosis device 18.

[0038] 3) The reverse osmosis RO membrane in the reverse osmosis device 18 uses the principle of reverse osmosis of the membrane to produce pure water, and the pure water produced by the reverse osmosis is transported to the pure water tank 14. The waste concentrated water produced in the reverse osmosis process is naturally discharged without pressure.

[0039] 4) When the pure water level in the pure water tank 14 reaches the set height (the water level is generally controlled at 0.3m-3m according to the actual situation on site), the pressure sensor on the pure water tank 14 transmits the water level signal to the programmable control The PLC1 and the programmable controller PLC1 send the start signal to the pure water pump explosion-proof switch 8. At this time, the pure water pump 15 is turned on to supply water to the water equipment.

[0040] 2. Backwashing process

[0041] When the pressure difference between the water inlet and the water outlet of the laminated disc filter 10 reaches the preset pressure difference (usually 50-100KPa), the programmable controller PLC1 sends a signal to the explosion-proof power box 4, and the electromagnetic three-way ball valve 17 It starts to rotate, and the groundwater is filtered by the laminated disc filter 10 and the security filter 12 and then enters the two-position three-way valve of the laminated disc filter 10. The two-position three-way valve is opened, and the two-position three-way valve enters from the filtering state. In the backwashing state, the filter unit of the laminated disc filter 10 starts backwashing. After a specified time (usually 10 seconds-60 seconds), the programmable controller PLC1 sends a signal to the explosion-proof power box 4, and the electromagnetic three-way ball valve 17 Reset, the two-position three-way ball valve is closed, the backwashing state enters the filtering state, and the filtering unit of the laminated disc filter 10 restarts filtering;

[0042] 3. Electronic control technology

[0043] 1) When the water level of the original water tank 3 is lower than the set minimum water level (generally less than 0.3 meters, it can be set according to the actual working conditions), the pressure sensor in the original water tank 3 will transmit the water level information to the programmable controller PLC1, programmable controller PLC1 sends a shutdown command to the raw water pump explosion-proof switch 5, the dosing pump explosion-proof switch 6, the pipeline booster pump explosion-proof switch 7, the raw water pump explosion-proof switch 5, the dosing pump explosion-proof switch 6, the pipeline booster pump The explosion-proof switch 7 turns off the pipeline booster pump 13, the dosing pump, and the raw water pump 9 in turn through the control circuit. When the water level in the raw water tank 3 returns to the specified value (usually more than 0.3 meters, it can be set according to actual working conditions) , The frequency signal of the pressure sensor on the original water tank 3 meets the program requirements of the programmable controller PLC1, and the programmable controller PLC1 re-executes the startup procedure. When the water level in the original water tank 3 is higher than the set maximum water level (usually 3 meters) The above can be set according to actual working conditions), the pressure frequency of the pressure sensor in the original water tank 3 is higher than the highest frequency value set by the programmable controller PLC1, and the programmable controller PLC1 sends a command to the explosion-proof power box 4, the original water tank 3 The solenoid ball valve 16 of the water inlet is closed.

[0044] 2) When the inlet pressure of the laminated disc filter 10 and the inlet pressure of the reverse osmosis device 18 are higher than the highest value set by the programmable controller PLC1 (generally 0.5Mpa-2.5MPa, it can be set according to actual working conditions When the disc filter 10 is installed, the pressure transmitter before filtration, the pressure transmitter after the filter, and the reverse osmosis water inlet pressure transmitter installed on the pipeline booster pump 13 will be The pressure frequency transmitted by the programming controller PLC1 is higher than the respective highest frequency value set by the programmable controller PLC1. The programmable controller PLC1 sends a stop command to stop the corresponding faulty equipment according to the actual fault situation, and the equipment executes the shutdown command to protect relative devices. Stop the operation of a complete set of mobile reverse osmosis water treatment equipment when the fault is serious.

[0045] 3) When the water level of the pure water tank 14 is lower than the set minimum value (usually less than 0.3 meters, it can be set according to actual working conditions), the frequency of the pressure sensor of the pure water tank 14 is lower than that of the programmable controller PLC1 To set the minimum frequency value, the programmable controller PLC1 sends a stop command to the pure water pump explosion-proof switch 8, and the pure water pump 15 stops. After the water level is restored, the programmable controller PLC1 sends a start signal to the pure water pump explosion-proof switch 8, and the pure water pump 15 Restart water supply to the equipment. When the water level of the pure water tank 14 is higher than the specified maximum value (usually more than 3 meters, it can be set according to the actual working conditions), the frequency of the pressure sensor of the pure water tank 14 is higher than that of the programmable controller PLC1 The programmable controller PLC1 sends a stop command to the explosion-proof switch 5 of the raw water pump, the explosion-proof switch of the dosing pump 6, and the explosion-proof switch of the pipeline booster pump, and turns off the pipeline booster pump 13, the dosing pump, Raw water pump 9, when the water level of the pure water tank 14 is lower than the specified value, the frequency of the pressure sensor of the pure water tank 14 is lower than the set value of the programmable controller PLC1, and the programmable controller PLC1 adds chemicals to the raw water pump explosion-proof switch 5. The pump explosion-proof switch 6 and the pipeline booster pump explosion-proof switch 7 issue a start-up command to turn on the raw water pump 9, the dosing pump, and the pipeline booster pump 13 in turn, and the equipment resumes normal operation.

[0046] The movable reverse osmosis water treatment equipment used in coal mines of this embodiment applies coal mine explosion-proof electrical equipment with coal mine explosion-proof safety signs to the overall system, which solves the requirements of working conditions in the special use environment of coal mines, especially explosion-proof programmable control The application of PLC allows the equipment to realize unattended automatic operation. It adopts a laminated pretreatment device and implements a linear modular arrangement. All systems are distributed on a movable flat car. According to the system process, the equipment is externally added with carbon steel belts. The box-shaped outer cover of the observation window enables the system to have the electrical explosion-proof characteristics required by the underground working environment of coal mines, adapt to the small environment and use the volume, mobility, high maintainability and impact resistance. The movable reverse osmosis water treatment equipment and its treatment process for underground coal mines of this embodiment have the following characteristics:

[0047] 1. Through creative design and development, the conventional reverse osmosis process is applied in underground coal mines to realize continuous use and production of pure water in dangerous and complex environments with explosive gases such as methane and narrow space layouts in coal mines. The equipment can be easily moved underground to adapt to different working locations;

[0048] 2. Apply electrical equipment with coal mine explosion-proof safety signs to the overall system, including coal safety explosion-proof motors, coal safety explosion-proof switches, programmable controller PLC, coal safety explosion-proof electromagnetic ball valves, coal safety explosion-proof electromagnetic tee links Ball valves, coal safety explosion-proof sensors, coal safety explosion-proof frequency converters, coal safety explosion-proof power control boxes, etc., through the supporting use of the above coal safety electrical appliances, solve the working conditions of the special use environment of coal mines, especially the explosion-proof type The application of the programming controller PLC enables the equipment to realize unattended automatic operation;

[0049] 3. The reverse osmosis device is used in the well, and each equipment is arranged in a linear and modular manner. All systems are distributed on a movable flat cart. According to the system process, each module includes: spliced ​​raw water tank module, pretreatment module, electrical control module, The RO membrane reverse osmosis device module and the intermediate water pure water tank module, a total of 5 modules, add a box-shaped cover made of carbon steel with an observation window to the outside of the equipment of each flat car, so that the system has the electrical required for the underground working environment of the coal mine Explosion-proof characteristics, suitable for use in small environments, high mobility, maintainability and impact resistance;

[0050] 4. Replace the water level controller with a pressure sensor. By drawing the frequency curve of the pressure sensor, the frequency value of the water level to any point is calculated, and the frequency value of the water level is transmitted to the flameproof programmable controller PLC. PLC controls the various electrical components of the water treatment equipment according to the set value of the water level frequency;

[0051] 5. In this process, the disc filter is used in coal mines. The filter element is made of fiber material to ensure that the filtered water SDI is less than 5. This reduces the volume of the equipment and expands the range of water production in this process (0.5-100T /h), the backwash of the disc filter is an internal source, which can ensure that the filter element is cleaned without stopping the equipment, ensuring the continuous operation of the equipment;

[0052] 6. The coal-safe flameproof electromagnetic three-way ball valve is used to change the water flow direction, thereby controlling the filtering and backwashing state of the two-position three-way valve of the disc filter.

[0053] The movable reverse osmosis water treatment equipment used in underground coal mines of this embodiment has reasonable structure design, low equipment damage rate, long service life, high production efficiency, flexible and convenient use, solves the problem of drinking water for underground personnel, and improves the working environment of workers Quality, using the reverse osmosis water treatment process of this equipment, the process flow is simple, easy to operate, safe and reliable.