CN216687683U - High-output tubular ultrafiltration membrane separation system - Google Patents
High-output tubular ultrafiltration membrane separation system Download PDFInfo
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- CN216687683U CN216687683U CN202121525089.5U CN202121525089U CN216687683U CN 216687683 U CN216687683 U CN 216687683U CN 202121525089 U CN202121525089 U CN 202121525089U CN 216687683 U CN216687683 U CN 216687683U
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Abstract
The utility model provides a high-output tubular ultrafiltration membrane separation system, and belongs to the technical field of power plant desulfurization wastewater treatment. In the system, an outlet of a tubular membrane reaction box is connected with an inlet on one side of a tubular membrane concentration box; an outlet at the upper part of the tubular membrane concentration tank is connected with the tubular membrane device, and a first circulating pump is arranged on a connecting pipeline; the lower outlet of the tubular membrane concentration tank is connected with a desulfurization absorption tower or a slurry tank of an external desulfurization wastewater treatment system, and a sludge pump is arranged on a connecting pipeline; the bottom outlet of the tubular membrane device is connected with the bottom inlet of the tubular membrane concentration tank, the connecting pipeline is provided with a second circulating pump, and the outlet on one side of the tubular membrane device is connected with the top inlet of the tubular membrane concentration tank; the outlet of the other side of the tubular membrane device is connected with the inlet of one side of the tubular membrane water production tank, the outlet of one side of the tubular membrane water production tank is connected with the inlet of the other side of the tubular membrane device, and the connecting pipeline is provided with a backwashing pump. The utility model can stably operate under the aim of realizing high output and realize the emission standard.
Description
Technical Field
The utility model belongs to the technical field of power plant desulfurization wastewater treatment, and particularly relates to a high-output tubular ultrafiltration membrane separation system.
Background
The thermal power plant is used as a large household for industrial water, and has huge water consumption and water discharge. With the gradual implementation of environmental regulations and policies such as 'action plan for preventing and treating water pollution', 'law for saving energy', 'law for protecting environment' and corresponding policies for charging for water and water drainage (water resource fee, drainage fee and standard exceeding fee), the requirements for the use, drainage and water quality of thermal power plants are increasingly strict. On the premise of safe production, the method fully utilizes the existing water resources to realize water saving and emission reduction and standard discharge of wastewater until zero discharge of wastewater is achieved, and becomes a main task faced by thermal power plants in China.
Coal is a main fuel of a coal-fired unit of a thermal power plant, contains a large amount of sulfides, heavy metals and the like, and a wet flue gas desulfurization process is a mainstream process of a flue gas desulfurization system of the current thermal power plant in China due to the characteristics of strong adaptability and the like. When the wet-type desulfurization process is adopted, the slurry in the desulfurization tower is recycled, the soluble salt of the slurry is continuously concentrated in the process, and the slurry needs to be continuously supplemented and updated to maintain the desulfurization performance of the system, so that a large amount of desulfurization wastewater containing heavy metal ions is generated. The desulfurized wastewater is acidic and contains a large amount of suspended matters, metal ions and F-、SO4 2-And Cl-And the like, although the amount of the desulfurization wastewater is not large, if the desulfurization wastewater is not treated in time, the desulfurization system equipment and the environment are greatly influenced, so that the realization of the zero discharge of the wastewater of the whole plant becomes the basic development trend and the starting point of the wastewater treatment of the thermal power plant in recent years.
In the prior art, along with the continuous increase of the wastewater generated by enterprises, the low-output tubular ultrafiltration membrane separation system in the desulfurization wastewater treatment system cannot meet the treatment requirement of the high desulfurization wastewater of the whole plant, and the traditional tubular ultrafiltration membrane separation system has low working efficiency, unclear design parameters, easy blockage, nonstandard discharge and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high-output tubular ultrafiltration membrane separation system, which designs output values and specification parameters of equipment, a backwashing system and a cleaning system through the connection and matching of the equipment such as a tubular membrane reaction box, a tubular membrane concentration box, a tubular membrane device, a tubular membrane water production box and the like, so that the tubular ultrafiltration membrane separation system can stably run under the aim of realizing high output and realize discharge standard.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a high-output tubular ultrafiltration membrane separation system comprises a tubular membrane reaction tank, a tubular membrane concentration tank, a tubular membrane device, a backwashing pump, a tubular membrane water production tank, a first circulating pump, a second circulating pump and a sludge discharge pump;
an outlet of the tubular membrane reaction box is connected with an inlet at one side of the tubular membrane concentration box through a first pipeline, an upper outlet at the other side of the tubular membrane concentration box is connected with an inlet at one side of the tubular membrane device through a second pipeline, and a first circulating pump is arranged on the second pipeline; the lower outlet on the other side of the tubular membrane concentration tank is connected with a desulfurization absorption tower or a slurry tank of an external desulfurization wastewater treatment system through a third pipeline, and a sludge discharge pump is arranged on the third pipeline;
the bottom outlet of the tubular membrane device is connected with the bottom inlet of the tubular membrane concentration tank through a fourth pipeline, a second circulating pump is arranged on the fourth pipeline, and the outlet on one side of the tubular membrane device is connected with the top inlet of the tubular membrane concentration tank through a first backwashing pipeline; an outlet at the other side of the tubular membrane device is connected with an inlet at one side of the tubular membrane water production tank through a fifth pipeline, an outlet at one side of the tubular membrane water production tank is connected with an inlet at the other side of the tubular membrane device through a second backwashing pipeline, and a backwashing pump is arranged on the second backwashing pipeline; and an outlet on the other side of the tubular membrane water production tank is used for collecting separation liquid.
Preferably, the tubular membrane device has the design water yield of 50m3The device comprises a chemical cleaning box, a cleaning pump, a tubular ultrafiltration membrane group and a rack; the chemical cleaning box, the cleaning pump and the tubular ultrafiltration membrane group are arranged on the rack;
the tubular membrane concentration tank and the tubular membrane water production tank are respectively connected with an inlet and an outlet on the tubular ultrafiltration membrane group, and a sampling device is arranged at the inlet and the outlet of the tubular ultrafiltration membrane group; the chemical cleaning box is connected with the tubular ultrafiltration membrane group through a sixth pipeline, and a cleaning pump and a valve are arranged on the sixth pipeline.
Preferably, the tubular ultrafiltration membrane group is made of PVDF (polyvinylidene fluoride), the sixth pipeline is made of UPVC (unplasticized polyvinyl chloride), and the valve is made of cast iron plated nylon; the design pressure of the sixth pipeline and the valve is not lower than 1.0 Mpa.
Preferably, the machine frame is provided with 4 rows of membrane groups, and each row of membrane group is formed by connecting 9 branch pipe type ultrafiltration membranes in series.
Preferably, the tubular membrane reaction box has a capacity of 30m2The box structure of carbon steel material, the box structural be equipped with the medicine mouth, the inside of box structure is equipped with a agitating unit.
Preferably, the tubular membrane concentrating tank has a capacity of 50m2The box structure of carbon steel material, the inside of box structure be equipped with second agitating unit, second agitating unit is connected with the motor drive that rated power is 4 kW.
Preferably, the number of the first circulating pumps is 2-4, the first circulating pumps are obtained by connecting centrifugal water pumps with the rated power of 45kW in series, and the design output is 240m3/h；
The sludge pump adopts a centrifugal water pump with the rated power of 5.5kW, and the designed output is 15m3/h；
The above-mentionedThe number of the backwashing pumps is 1-3, the backwashing pumps are obtained by connecting centrifugal water pumps with the rated power of 11kW in series, and the design output is 80m3/h。
Preferably, the centrifugal water pump is of an open impeller structure and is made of SS2205 duplex stainless steel.
Preferably, the number of the cleaning pumps is 2-3, the cleaning pumps are obtained by connecting magnetic pumps with the rated power of 5.5kW in series, and the design output is 50m3H; the overflowing material of the magnetic pump is fluoroplastic alloy.
Preferably, the tubular membrane water production tank has the capacity of 50m2The FRP box structure.
Compared with the prior art, the utility model has the advantages that:
the utility model designs a high-output tubular ultrafiltration membrane separation system, and the designed output value reaches 100m3And h, the problems that the tubular ultrafiltration membrane separation system in the conventional desulfurization wastewater treatment process flow has low output and cannot meet the desulfurization wastewater treatment requirement can be solved. The design of combining each equipment volume, power, material and backwash, washing pipeline has guaranteed that the system can not take place to block up under the requirement that satisfies the high output value, but even running, it is efficient. The high-output tubular ultrafiltration membrane separation system has compact structure and small occupied area, the content of calcium carbonate in sludge is more than 96 percent, and the turbidity of effluent is less than 1 NTU; the calcium ion concentration is less than 50mg/l, and the water quality indexes meet the requirements of DL/T997.
Drawings
FIG. 1 is a schematic structural diagram of a high-output tubular ultrafiltration membrane separation system provided by the utility model.
Fig. 2 is a schematic structural diagram of a tubular membrane device provided by the utility model.
In the figure: the system comprises a 1-tubular membrane reaction tank, a 2-tubular membrane concentration tank, a 3-chemical cleaning tank, a 4-cleaning pump, a 5-tubular ultrafiltration membrane group, a 6-backwashing pump, a 7-tubular membrane water production tank, a 801-first circulating pump, a 802-second circulating pump, a 9-sludge discharge pump and a 10-frame.
Detailed Description
The utility model is further described below with reference to the accompanying drawings.
The embodiment provides a high-output tubular ultrafiltration membrane separation system, as shown in fig. 1, which comprises a tubular membrane reaction tank 1, a tubular membrane concentration tank 2, a tubular membrane device, a backwashing pump 6, a tubular membrane water production tank 7, a first circulating pump 801, a second circulating pump 802 and a sludge discharge pump 9; the structure of the tubular membrane device is shown in figure 2, and comprises a chemical cleaning box 3, a cleaning pump 4, a tubular ultrafiltration membrane group 5 and a rack 10.
An outlet of the tubular membrane reaction box 1 is connected with an inlet at one side of the tubular membrane concentration box 2 through a first pipeline, an outlet at the upper part of the other side of the tubular membrane concentration box 2 is connected with an inlet at one side of the tubular membrane device through a second pipeline, and a first circulating pump 801 is arranged on the second pipeline; the lower part outlet of the other side of the tubular membrane concentration tank 2 is connected with a desulfurization absorption tower or a slurry tank of an external desulfurization wastewater treatment system through a third pipeline, and the third pipeline is provided with a sludge discharge pump 9 for discharging sludge at the bottom of the tubular ultrafiltration membrane concentration tank.
The bottom outlet of the tubular membrane device is connected with the bottom inlet of the tubular membrane concentration tank 2 through a fourth pipeline, a second circulating pump 802 is arranged on the fourth pipeline, and the outlet on one side of the tubular membrane device is connected with the top inlet of the tubular membrane concentration tank 2 through a first backwashing pipeline; an outlet at the other side of the tubular membrane device is connected with an inlet at one side of a tubular membrane water production tank 7 through a fifth pipeline, an outlet at one side of the tubular membrane water production tank 7 is connected with an inlet at the other side of the tubular membrane device through a second backwashing pipeline, and a backwashing pump 6 is arranged on the second backwashing pipeline; and an outlet on the other side of the tubular membrane water production tank 7 is used for collecting separation liquid.
The chemical cleaning box 3, the cleaning pump 4 and the tubular ultrafiltration membrane group 5 are arranged on the frame; the tubular membrane concentration tank 2 and the tubular membrane water production tank 7 are respectively connected with an inlet and an outlet on the tubular ultrafiltration membrane group 5, and a sampling device is arranged at the inlet and the outlet of the tubular ultrafiltration membrane group 5; the chemical cleaning box 3 is connected with a tubular ultrafiltration membrane group 5 through a sixth pipeline, and a cleaning pump 4 and a valve are arranged on the sixth pipeline.
In order to meet the backwashing requirement, the liquid enters the tubular ultrafiltration membrane group from the second pipeline, and when the tubular ultrafiltration membrane group is discharged from the fifth pipeline, the liquid flows through the reverse side from the front side of the ultrafiltration membrane, so that the filtering function is realized. And liquid flows through the front side from the back side of the ultrafiltration membrane to realize the backwashing function when entering the tubular ultrafiltration membrane group from the second backwashing channel and exiting the tubular ultrafiltration membrane group from the first backwashing channel.
In one embodiment of the utility model, the tubular membrane reaction chamber 1 has a capacity of 30m2The box structure of carbon steel material, the box structural be equipped with the medicine mouth, the inside of box structure is equipped with first agitating unit. The tubular membrane reaction box is used for removing Ca in the desulfurization wastewater2+And Mg2+With the addition of NaOH and Na2CO3A chemical reaction is carried out to generate Mg (OH)2Precipitation and CaCO3And in a deposition place, the dosing port is used for dosing sodium hydroxide, sodium carbonate and/or sodium hypochlorite, and the first stirring device can be used for preventing excessive solid deposition from being blocked.
The tubular membrane concentration tank 2 has the capacity of 50m2The box structure of carbon steel material, the inside of box structure be equipped with second agitating unit, second agitating unit is connected with the motor drive that rated power is 4 kW. The tubular membrane concentration box is a place for storing desulfurization wastewater after chemical reaction between the flow-through tubular membrane reaction box and the added medicament, and the second stirring device can be used for preventing excessive solid precipitation from being blocked.
The number of the first circulating pumps is 2-4, the first circulating pumps are obtained by connecting centrifugal water pumps with rated power of 45kW in series, and the design output is 240m3And h, conveying the desulfurization wastewater. The sludge pump adopts a centrifugal water pump with the rated power of 5.5kW, and the designed output is 15m3And/h, used for discharging sludge generated by bottom precipitation. The number of the backwashing pumps is 1-3, the backwashing pumps are obtained by connecting centrifugal water pumps with the rated power of 11kW in series, and the design output is 80m3And/h, used for conveying backwashing water.
In this embodiment, the centrifugal water pump is an open impeller structure, the material is SS2205 duplex stainless steel, the sealing mode takes corrosion-resistant mechanical seal into consideration, the dynamic and static ring material is silicon carbide-silicon carbide, and the auxiliary seal ring material is PTFE.
As shown in fig. 2, 4 rows of membrane groups are arranged on the frame 10, each of the membrane groups is formed by connecting 9 branch type ultrafiltration membranes in series, wherein the tubular ultrafiltration membrane group is made of PVDF, the sixth pipeline is made of UPVC, and the valve is made of cast iron plated nylon; the design pressure of the sixth pipeline and the valve is not lower than 1.0 Mpa. The number of the cleaning pumps is 2-3, the cleaning pumps are obtained by connecting magnetic pumps with rated power of 5.5kW in series, and the design output is 50m3H, used for conveying chemical cleaning liquid; the overflowing material of the magnetic pump is fluoroplastic alloy.
The design capacity of the tubular membrane chemical cleaning box is 2.7m3The chemical cleaning liquid of the ultrafiltration device is selected according to the quality of the inlet water and the characteristics of the selected tubular ultrafiltration membrane component. Usually hydrochloric acid, sodium hydroxide and sodium hypochlorite, and the material is carbon steel for corrosion prevention.
In this embodiment, the frame is equipped with sufficient piping, valves, and fittings, as well as all the brackets, fasteners, clamps, and other accessories to meet the needs of the device for operation and cleaning. The type of the tubular ultrafiltration membrane is TUF-61, and the membrane area is 4.25m2Resistant to 20000mg/L chloride ion concentration and used for ultrafiltration of desulfurization wastewater. The operation mode of the tubular membrane device is cross flow, and the designed water yield is 50m3/h。
The tubular membrane water production tank 7 has the capacity of 50m2The FRP box structure is used for storing the desulfurization wastewater filtered by the tubular membrane ultrafiltration system.
In this embodiment, the above-mentioned high-output tubular ultrafiltration membrane separation system has the following working modes:
when the device works, effluent after reaction and clarification of the integrated high-efficiency reaction clarification tank automatically flows into the tubular membrane reaction box 1, agents such as sodium hydroxide, sodium carbonate and/or sodium hypochlorite are added into a dosing port of the tubular membrane reaction box 1, wherein the sodium hydroxide and the sodium hypochlorite are used for standby, and if the pH value of effluent of the integrated high-efficiency reaction clarification tank does not meet the design requirement, the sodium hydroxide is continuously added. After the wastewater is subjected to chemical addition reaction, calcium ions react to generate calcium carbonate precipitates, and magnesium ions react to generate magnesium hydroxide precipitates;
then, the turbid liquid in the tubular membrane reaction tank 1 automatically flows into the tubular membrane concentration tank 2 through the first pipeline, the turbid liquid is sent to the tubular ultrafiltration membrane group 5 carried on the rack 10 through the first circulating pump 801 on the second pipeline, the effluent water ultrafiltered by the tubular ultrafiltration membrane group 5 enters the tubular membrane water production tank 7 through the fifth pipeline, and the residual concentrated water enters the tubular membrane concentration tank 2 again for recycling under the action of the second circulating pump 802 on the fourth pipeline. Because the main component of the sludge concentrated by the tubular membrane concentration tank 2 is calcium carbonate, when the solid content of the sludge reaches 5 percent, the sludge is conveyed to a desulfurization absorption tower or a slurry tank of an external desulfurization wastewater treatment system through a sludge discharge pump 9 on a third pipeline at the lower part to be used as a desulfurizer.
When the tubular ultrafiltration membrane separation system operates for a period of time, sediment deposits on the surface of a filtering element of the tubular ultrafiltration membrane, and backwashing is needed to recover the operating flux of the tubular ultrafiltration membrane group. When backwashing is carried out, water in the tubular membrane water production tank 7 enters the tubular ultrafiltration membrane group 5 through the backwashing pump 6 on the second backwashing channel and then flows into the tubular membrane concentration tank 2 through the first backwashing channel for recycling.
The tubular ultrafiltration membrane separation system is operated for a long time, and pollutants which are difficult to remove through backwashing can be deposited on the surface of the membrane, the pollutants have certain influence on the flux of the membrane, so that the ultrafiltration membrane needs to be periodically chemically cleaned, and therefore, a chemical cleaning tank 3 and a cleaning pump 4 are arranged in the tubular membrane device. When chemical cleaning is carried out, chemical cleaning liquid in the tubular membrane chemical cleaning box 3 enters the tubular ultrafiltration membrane through the cleaning pump 4 to be cleaned, and the cleaning liquid is usually hydrochloric acid, sodium hydroxide and sodium hypochlorite.
The high-output tubular ultrafiltration membrane separation system provided by the utility model can realize that the ultrafiltration treatment capacity of desulfurization wastewater reaches 100m3The filter has the advantages of compact structure, small occupied area, low investment and good ultrafiltration effect, the content of calcium carbonate in sludge is more than 96 percent, and the turbidity of effluent is less than 1 NTU; the concentration of calcium ions is less than 50 mg/l; other water quality indexes all meet the requirements of DL/T997. Under the design of the output value and the specification parameters of each device and the design of backwashing and cleaning, the tubular device is madeThe ultrafiltration membrane separation system can stably operate under the aim of realizing high output.
The foregoing lists merely illustrate specific embodiments of the utility model. It is obvious that the utility model is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the utility model.
Claims (10)
1. A high-output tubular ultrafiltration membrane separation system is characterized by comprising a tubular membrane reaction box (1), a tubular membrane concentration box (2), a tubular membrane device, a backwashing pump (6), a tubular membrane water production box (7), a first circulating pump (801), a second circulating pump (802) and a sludge discharge pump (9);
an outlet of the tubular membrane reaction box (1) is connected with an inlet at one side of the tubular membrane concentration box (2) through a first pipeline, an outlet at the upper part of the other side of the tubular membrane concentration box (2) is connected with an inlet at one side of the tubular membrane device through a second pipeline, and a first circulating pump (801) is arranged on the second pipeline; the lower outlet at the other side of the tubular membrane concentration tank (2) is connected with a desulfurization absorption tower or a slurry tank of an external desulfurization wastewater treatment system through a third pipeline, and a sludge pump (9) is arranged on the third pipeline;
the bottom outlet of the tubular membrane device is connected with the bottom inlet of the tubular membrane concentration tank (2) through a fourth pipeline, a second circulating pump (802) is arranged on the fourth pipeline, and the outlet on one side of the tubular membrane device is connected with the top inlet of the tubular membrane concentration tank (2) through a first backwashing pipeline; an outlet at the other side of the tubular membrane device is connected with an inlet at one side of the tubular membrane water production tank (7) through a fifth pipeline, an outlet at one side of the tubular membrane water production tank (7) is connected with an inlet at the other side of the tubular membrane device through a second backwashing pipeline, and a backwashing pump (6) is arranged on the second backwashing pipeline; an outlet on the other side of the tubular membrane water generating tank (7) is used for collecting the separation liquid.
2. The high-output tubular ultrafiltration membrane separation system of claim 1Characterized in that the designed water yield of the tubular membrane device is 50m3The device comprises a chemical cleaning box (3), a cleaning pump (4), a tubular ultrafiltration membrane group (5) and a rack (10); the chemical cleaning box (3), the cleaning pump (4) and the tubular ultrafiltration membrane group (5) are arranged on the frame;
the tubular membrane concentration tank (2) and the tubular membrane water production tank (7) are respectively connected with an inlet and an outlet on the tubular ultrafiltration membrane group (5), and a sampling device is arranged at the inlet and the outlet of the tubular ultrafiltration membrane group (5); the chemical cleaning box (3) is connected with the tubular ultrafiltration membrane group (5) through a sixth pipeline, and a cleaning pump (4) and a valve are arranged on the sixth pipeline.
3. The high-output tubular ultrafiltration membrane separation system of claim 2, wherein the material of the membrane of the tubular ultrafiltration membrane module is PVDF, the material of the sixth pipeline is UPVC, and the material of the valve is cast iron plated nylon; the design pressure of the sixth pipeline and the valve is not lower than 1.0 Mpa.
4. The high-output tubular ultrafiltration membrane separation system of claim 2, wherein the frame is provided with 4 rows of membrane groups, and each row of membrane group is formed by connecting 9 branch tubular ultrafiltration membranes in series.
5. The high-output tubular ultrafiltration membrane separation system of claim 1, wherein the tubular membrane reaction tank (1) has a capacity of 30m2The box structure of carbon steel material, the box structural be equipped with the medicine mouth, the inside of box structure is equipped with first agitating unit.
6. The high-output tubular ultrafiltration membrane separation system of claim 1, wherein said tubular membrane concentration tank (2) has a capacity of 50m2The box structure of carbon steel material, the inside of box structure be equipped with second agitating unit, second agitating unit is connected with the motor drive that rated power is 4 kW.
7. The high-output tubular ultrafiltration membrane separation system of claim 1, wherein the number of the first circulating pumps is 2-4, and the first circulating pumps are connected in series by using centrifugal water pumps with a rated power of 45kW, and the design output is 240m3/h；
The sludge pump adopts a centrifugal water pump with the rated power of 5.5kW, and the designed output is 15m3/h；
The number of the backwashing pumps is 1-3, the backwashing pumps are obtained by connecting centrifugal water pumps with the rated power of 11kW in series, and the design output is 80m3/h。
8. The high-output tubular ultrafiltration membrane separation system of claim 7, wherein the centrifugal water pump is of an open impeller structure and is made of SS2205 duplex stainless steel.
9. The high-output tubular ultrafiltration membrane separation system of claim 2, wherein the number of the cleaning pumps is 2-3, the cleaning pumps are obtained by connecting magnetic pumps with a rated power of 5.5kW in series, and the design output is 50m3H; the overflowing material of the magnetic pump is fluoroplastic alloy.
10. The high-output tubular ultrafiltration membrane separation system of claim 1, wherein the tubular membrane water production tank (7) has a capacity of 50m2The FRP box structure.
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| CN202121525089.5U CN216687683U (en) | 2021-07-06 | 2021-07-06 | High-output tubular ultrafiltration membrane separation system |
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