Intelligent treatment system for waste water discharge of thermal power plant

Abstract

The invention relates to an intelligent treatment system for wastewater discharge of a thermal power plant. The intelligent treatment system comprises wastewater storage equipment, wastewater treatment equipment, solid-liquid separation equipment, filtration and neutralization equipment, membrane filtration equipment, evaporative crystallization equipment and control equipment which are communicated in sequence, a first liquid level sensor is arranged in the wastewater storage equipment, a first drain pump is arranged at a water outlet of the wastewater storage equipment, a second liquid level sensor and a water quality sensor are arranged in the wastewater treatment equipment, a second drain pump is arranged at a water outlet of the wastewater treatment equipment, and a third liquid level sensor and a mud level sensor are arranged in the solid-liquid separation equipment; a third drain pump is arranged at a water outlet of the solid-liquid separation equipment; a fourth liquid level sensor is arranged in the filtering and neutralizing equipment; a fourth drain pump is arranged at a water outlet of the filtration and neutralization equipment, a PH sensor is arranged in the filtration and neutralization equipment, the membrane filtration equipment is provided with a pressure sensor, and the sensor and the drain pump are connected with the control equipment. By arranging the control platform, all the devices can work efficiently and cooperatively.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wastewater discharge, in particular to an intelligent treatment system for wastewater discharge of a thermal power plant. BACKGROUND

[0002] A large amount of wastewater is generated in the process of power generation in a thermal power plant, including desulfurization wastewater, circulating cooling system drainage, chemical water treatment system wastewater, etc. These wastewaters contain high concentrations of salt, heavy metal ions, suspended solids and other pollutants. If not properly treated and directly discharged, they will cause serious pollution to the ecological environment such as water bodies and soil. With the increasingly stringent environmental protection requirements, zero wastewater discharge has become an inevitable trend for the sustainable development of thermal power plants. The existing technologies for wastewater treatment in thermal power plants have emerged as the times require, but there are still many deficiencies in practical application. In the prior art, the wastewater treatment in thermal power plants usually adopts a combined process of "pretreatment + membrane separation + evaporation crystallization". However, there is a lack of coordinated linkage and intelligent control among the devices in each link, resulting in low overall treatment efficiency, high energy consumption and insufficient stability, which makes it difficult to ensure long-term stable and efficient operation of the system. Therefore, the intelligent treatment system for wastewater discharge of a thermal power plant is proposed to solve the above-mentioned problems. SUMMARY

[0003] The present application provides an intelligent treatment system for wastewater discharge of a thermal power plant, which can make each device work cooperatively and improve the treatment efficiency and stability of wastewater through liquid level detection, PH value and pressure monitoring of each device in the system.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions: An intelligent treatment system for wastewater discharge of a thermal power plant, comprising wastewater storage equipment, wastewater treatment equipment, solid-liquid separation equipment, filtration and neutralization equipment, membrane filtration equipment, evaporation crystallization equipment and control equipment connected in sequence; The wastewater storage equipment is provided with a first liquid level sensor and is connected with the control equipment, so that the liquid level in the wastewater storage equipment is not lower than a preset height; The outlet of the wastewater storage equipment is provided with a first drainage pump, the wastewater treatment equipment is provided with a second liquid level sensor and a water quality sensor, and the first drainage pump, the second liquid level sensor and the water quality sensor are used in cooperation and are all connected with the control equipment; The outlet of the wastewater treatment equipment is provided with a second drainage pump, the solid-liquid separation equipment is provided with a third liquid level sensor and a sludge level sensor, the third liquid level sensor and the second drainage pump are used in cooperation and are both connected with the control equipment, and the sludge level sensor is connected with the control equipment to clean the sludge when the sludge level sensor detects that the sludge at the bottom of the solid-liquid separation equipment reaches a certain height; The water outlet of the solid-liquid separation device is provided with a third hydrophobic pump, the filtering and neutralizing device is provided with a fourth liquid level sensor, the third hydrophobic pump and the fourth liquid level sensor are used in cooperation, and both are connected with the control device; The water outlet of the filtering and neutralizing device is provided with a fourth hydrophobic pump, the filtering and neutralizing device is provided with a PH sensor, the PH sensor and the fourth hydrophobic pump are used in cooperation, and both are connected with the control device; The filtering upstream of the membrane filtering device is provided with a pressure sensor for detecting the water pressure in the membrane filtering device, and the fourth hydrophobic pump and the pressure sensor are connected with the control device.

[0005] Preferably, the wastewater treatment device comprises a treatment box, the treatment box is provided with a neutralizing cavity, a sedimentation cavity and a flocculation cavity from top to bottom, the upper part of the neutralizing cavity is provided with a water inlet, and the water inlet is communicated with the first hydrophobic pump; The bottom of the neutralizing cavity and the sedimentation cavity is respectively provided with a first electric valve and a second electric valve, and the second hydrophobic pump is connected to the water outlet of the flocculation cavity; The water quality sensor and the second liquid level sensor are arranged in the neutralizing cavity.

[0006] Preferably, the outer side walls of the neutralizing cavity, the sedimentation cavity and the flocculation cavity are respectively provided with a dosing tank, the bottom of the dosing tank is connected with a medicine outlet pipe, a metering pump is arranged on the medicine outlet pipe, a fifth liquid level sensor for detecting the medicine is arranged in the dosing tank, the fifth liquid level sensor, the metering pump and the control device are connected, and the metering pump is used in cooperation with the water quality sensor.

[0007] Preferably, the filtering and neutralizing device comprises a sand filter tank and a reverse adjusting tank connected in sequence, the water inlet of the sand filter tank is communicated with the water outlet of the third hydrophobic pump, the water inlet of the reverse adjusting tank is located at the upper end thereof, the water outlet is located at the lower end thereof, and the PH sensor and the fourth liquid level sensor are arranged in the reverse adjusting tank.

[0008] Preferably, the membrane filtering device comprises a filtering box, a special nanofiltration membrane and a reverse osmosis membrane arranged in the filtering box, the special nanofiltration membrane and the reverse osmosis membrane are arranged from top to bottom, the water inlet of the filtering box is located at the upper end thereof, and the water outlet is located at the lower end thereof, so that the wastewater is filtered through the special nanofiltration membrane and the reverse osmosis membrane in sequence.

[0009] Preferably, the filtering box is further provided with a cleaning device, and the side wall of the filtering box is further communicated with a sundry collecting box; the cleaning device comprises a linear driving assembly and a cleaning brush. The cleaning brush is connected to the driving end of the linear driving assembly, and the lower end of the cleaning brush abuts against the upper end surface of the special nanofiltration membrane, and under the driving of the linear driving assembly, the sundries on the upper end surface of the special nanofiltration membrane are pushed into the sundry collecting box; The sundry collecting box is provided with a cleaning member, so that when the cleaning brush enters the sundry collecting box and contacts the cleaning member, the sundries attached to the cleaning brush are cleaned. The pressure sensor is arranged on the inner side wall of the filter box and located above the special nanofiltration membrane.

[0010] Preferably, the linear driving assembly comprises a first motor and a threaded rod, the first motor is arranged on the outer side wall of the filter box, one end of the threaded rod is in transmission connection with the first motor by penetrating through the filter box, the other end is rotatably arranged on the inner side wall of the sundry collecting box, the cleaning brush is threadedly connected to the threaded rod, and the cleaning brush is slidably arranged on the inner side wall of the filter box. The cleaning member is arranged as an elastic scraper, and a plurality of spaced protrusions are arranged on the elastic scraper and can be inserted into the interior of the brush surface of the cleaning brush.

[0011] Preferably, the water outlet of the filter box is provided with a flow sensor and is connected to the control device.

[0012] Preferably, the evaporation crystallization device comprises a shell, an evaporation chamber and a crystallization chamber arranged in the shell, the evaporation chamber has a water inlet and is in communication with the water outlet of the membrane filtration device, and a flow guide plate is rotatably arranged between the evaporation chamber and the crystallization chamber. The evaporation chamber is provided with a heating device, and the evaporation chamber has a gas outlet. The crystallization chamber is provided with a stirring device.

[0013] Preferably, a steam compression device is fixed to the outer surface of the shell, the gas inlet of the steam compression device is in communication with the gas outlet of the shell, and the outlets of the steam compression device are in communication with the evaporation chamber.

[0014] Compared with the prior art, the beneficial effects of the present application are that: Through the cooperation of the first liquid level sensor, the first hydrophobic pump, the second liquid level sensor, the water quality sensor, the second hydrophobic pump, the third liquid level sensor, the mud level sensor, the third hydrophobic pump, the fourth liquid level sensor, the fourth hydrophobic pump, the PH sensor and the pressure sensor, and under the common control of the control device, the entire wastewater treatment system is more intelligent, the human participation is reduced, the overall treatment efficiency is higher and more stable. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0016] Figure 1 System schematic diagram of the embodiment in the present application Figure 1 ; Figure 2 System schematic diagram of the embodiment in the present application Figure 2 ; Figure 3 Membrane filtration equipment schematic diagram of the embodiment in the present application Figure 4 Elastic scraper schematic diagram of the embodiment in the present application Figure 5 Evaporative crystallization equipment schematic diagram of the embodiment in the present application

[0017] Explanation of reference signs: 1, wastewater storage equipment; 101, wastewater storage tank; 2, wastewater treatment equipment; 201, treatment tank; 202, neutralization chamber; 203, sedimentation chamber; 204, flocculation chamber; 205, first electric valve; 206, second electric valve; 207, dosing assembly; 2071, dosing tank; 2072, dosing pipe; 2073, metering pump; 2074, fifth liquid level sensor; 208, second motor; 209, chain wheel; 210, stirring fan blade; 3, solid-liquid separation equipment; 4, filtration and neutralization equipment; 401, sand filter tank; 402, reverse adjustment tank; 5, membrane filtration equipment; 501, filtration tank; 502, special nanofiltration membrane; 503, reverse osmosis membrane; 504, sundry collection tank; 505, first motor; 506, threaded rod; 507, cleaning brush; 508, elastic scraper; 509, protrusion; 510, flow sensor; 6, evaporative crystallization equipment; 601, shell; 602, evaporation chamber; 603, crystallization chamber; 604, flow guide plate; 605, heating device; 606, stirring device; 607, vapor compression device; 7, first liquid level sensor; 8, first drain pump; 9, second liquid level sensor; 10, water quality sensor; 11, second drain pump; 12, third liquid level sensor; 13, mud level sensor; 14, third drain pump; 15, fourth liquid level sensor; 16, fourth drain pump; 17, PH sensor; 18, fifth drain pump; 20, control equipment. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a link; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] like Figures 1-5 As shown in the figure, this embodiment of the invention provides an intelligent wastewater treatment system for thermal power plant wastewater discharge, including a wastewater storage device 1, a wastewater treatment device 2, a solid-liquid separation device 3, a filtration and neutralization device 4, a membrane filtration device 5, an evaporation and crystallization device 6, and a control device 20 connected in sequence; wherein the wastewater storage device 1 is used to store wastewater generated by thermal power plants; the wastewater treatment device 2 is used to react with some ions in the wastewater using chemical reagents to reduce the heavy metal content and suspended solids in the wastewater, preparing for subsequent solid-liquid separation in the wastewater; the solid-liquid separation device 3 is used to process the wastewater... The suspended solids are settled; the filtration and neutralization equipment is used to perform preliminary filtration and acid-base balance on the wastewater after the solid-liquid separation equipment 3; the membrane filtration equipment 5 is used to further filter the acid-base balanced water and filter out the small impurities that have not settled; the evaporation and crystallization equipment 6 evaporates and crystallizes the filtered product water, and the crystallized salt is discharged through the salt discharge pipe; and the control equipment 20 is used to monitor the status of the wastewater storage equipment 1, wastewater treatment equipment 2, solid-liquid separation equipment 3, filtration and neutralization equipment 4, membrane filtration equipment 5, and evaporation and crystallization equipment 6, so that they can work together intelligently.

[0022] Specifically, the wastewater storage device 1 includes a wastewater storage tank, wherein the wastewater storage tank is provided with a first liquid level sensor 7, the outlet of the wastewater storage device 1 is provided with a first drainage pump 8, the wastewater treatment device 2 is provided with a second liquid level sensor 9 and a water quality sensor 10, the outlet of the wastewater treatment device 2 is provided with a second drainage pump 11, the solid-liquid separation device 3 is provided with a third liquid level sensor 12 and a sludge level sensor 13, the outlet of the solid-liquid separation device 3 is provided with a third drainage pump 14, the filtration and neutralization device 4 is provided with a fourth liquid level sensor 15, the outlet of the filtration and neutralization device 4 is provided with a fourth drainage pump 16, the filtration and neutralization device 4 is provided with a PH sensor 17, and the membrane filtration device 5 is provided with a pressure sensor, wherein the first liquid level sensor 7, the first drainage pump 8, the second liquid level sensor 9, the water quality sensor 10, the second drainage pump 11, the third liquid level sensor 12, the sludge level sensor 13, the third drainage pump 14, the fourth liquid level sensor 15, the fourth drainage pump 16, the PH sensor 17 and the pressure sensor are connected with the control device 20, and cooperate with each other to complete the intelligent operation of the entire intelligent wastewater discharge treatment system of the power plant, specifically as follows: the first liquid level sensor 7 is used for detecting the liquid level of the wastewater in the wastewater storage tank, if the liquid level is lower than a certain height, the first drainage pump 8 is stopped, when the liquid level of the wastewater in the wastewater storage tank 101 reaches a certain height, the first drainage pump 8 is started according to the running condition; the second liquid level sensor 9 is used for detecting the liquid level in the wastewater treatment device 2, when the liquid level of the wastewater treatment device 2 is lower than a certain height, it proves that the wastewater treatment device 2 can enter the wastewater, then the first drainage pump 8 is started, so that the wastewater in the wastewater storage tank 101 enters the wastewater treatment device 2, and the water quality sensor 10 is used for detecting the water quality in the wastewater treatment device 2 to judge whether the water quality is completed by the chemical reagent reaction, if yes, the second drainage pump 11 can be started, otherwise it should not be started; specifically, the third liquid level sensor 12 is used for detecting the liquid level in the solid-liquid separation device 3, when it is detected that the liquid level is lower than a certain height, the second drainage pump 11 is started to supply the water in the wastewater treatment device 2 to the solid-liquid separation device 3; the PH sensor 17 is used for detecting whether the PH value in the filtration and neutralization device 4 meets the requirements, if yes, the fourth drainage pump 16 can be controlled to supply the water to the membrane filtration device 5, if the fourth liquid level sensor 15 detects that the liquid level in the filtration and neutralization device 4 is lower than a certain height, the third drainage pump 14 is started to supply the supernatant in the solid-liquid separation device 3 to the filtration and neutralization device 4; the pressure sensor is used for detecting the liquid pressure of the filtration membrane filtration end side in the membrane filtration device 5, if the pressure increases suddenly and exceeds a certain value, it proves that the filtration membrane of the membrane filtration device 5 is blocked and needs to be cleaned, so that the membrane filtration device 5 can stably filter raw water and stably produce water, and the produced water after filtration enters the evaporation crystallization device 6;In summary, through the cooperation of the first liquid level sensor 7, the first drainage pump 8, the second liquid level sensor 9, the water quality sensor 10, the second drainage pump 11, the third liquid level sensor 12, the sludge level sensor 13, the third drainage pump 14, the fourth liquid level sensor 15, the fourth drainage pump 16, the PH sensor 17 and the pressure sensor, and under the control of the control device 20, the entire wastewater treatment system is intelligentized. Specifically, the control device 20 can be an industrial computer. It should be noted that before the entire system is formally operated, it needs to be tested and debugged by the operator to finally obtain stable operating parameters, such as the detection height of the liquid level sensor, the pressure value of the pressure sensor, etc.

[0023] Specifically, the wastewater treatment device 2 includes a treatment tank 201, and the treatment tank 201 is provided with a neutralization chamber 202, a sedimentation chamber 203 and a flocculation chamber 204 from top to bottom. The neutralization chamber 202 is provided with a water inlet at the upper portion, and the water inlet is communicated with the first drainage pump 8. The flocculation chamber 204 has a water outlet, and the water outlet is communicated with the water inlet of the second drainage pump 11 through a pipeline. The first electric valve 205 and the second electric valve 206 are respectively arranged at the bottom of the neutralization chamber 202 and the sedimentation chamber 203. After the neutralization of the wastewater in the neutralization chamber 202 is completed, the first electric valve 205 is opened to make the wastewater in the neutralization chamber 202 enter the sedimentation tank. After the sedimentation of the wastewater in the sedimentation chamber 203 is completed, the second electric valve 206 is opened to make the wastewater in the sedimentation tank enter the flocculation chamber 204. Of course, the wastewater in the flocculation chamber 204 will also be supplied to the solid separation device through the second drainage pump 11. Here, the wastewater in the flocculation chamber 204 is first discharged, then the second electric valve 206 is opened to make the wastewater in the sedimentation chamber 203 enter the flocculation chamber 204, then the first electric valve 205 is opened to make the wastewater in the neutralization chamber 202 enter the sedimentation chamber 203, and then the wastewater in the wastewater storage tank 101 enters the neutralization chamber 202 through the first drainage pump 8 to perform the next round of wastewater treatment.

[0024] Specifically, the neutralization cavity 202 is provided with a water quality sensor 10 and a second liquid level sensor 9. The water quality sensor 10 is used to detect whether the neutralization cavity 202 is adjusted after adding the chemical reagent. The second liquid level sensor 9 is used to detect whether the wastewater in the neutralization cavity 202 is lower than a certain height to determine whether the wastewater is emptied, so that the first hydrophobic pump 8 supplies wastewater to the neutralization cavity 202. The main function of the neutralization cavity 202 is to adjust the pH value of the wastewater. Lime milk or dilute sulfuric acid needs to be added to the neutralization cavity 202 to react with the acid / base in the water, adjust the pH to the neutral range of 6-9, avoid the subsequent equipment (such as the membrane module) being corroded by acid and alkali, and create a suitable environment for the subsequent precipitation reaction. The water quality sensor 10 in the neutralization cavity 202 can be set as a PH sensor 17. The settling cavity 203 is used to add sodium sulfide or magnesium hydroxide and other precipitants to reduce the content of heavy metals in the water. The fine suspended matter (such as colloidal particles and small precipitate flocs) in the settling cavity 203 that has not completely settled is added with polyacrylamide (PAM) and other flocculants. PAM can make fine particles coagulate into large flocs through adsorption and bridging effect, improve the settling speed and efficiency, and lay a foundation for subsequent solid-liquid separation. The wastewater passes through the neutralization cavity 202, the settling cavity 203 and the flocculation cavity 204 in turn to complete the PH, heavy metal ions and suspended matter settlement of the pre-wastewater. After the water quality sensor 10 detects that the PH adjustment of the wastewater in the neutralization cavity 202 is completed, the second electric valve 206 and the first electric valve 205 can be opened in turn. Of course, the precondition is that the wastewater in the flocculation cavity 204 has been supplied to the solid-liquid separation equipment 3 by the second hydrophobic pump 11.

[0025] Specifically, the outer side wall of the neutralization cavity 202, the sedimentation cavity 203 and the flocculation cavity 204 is respectively provided with a dosing assembly 207, the dosing assembly 207 comprises a dosing tank 2071, a dosing pipe 2072 and a metering pump 2073, the dosing tank 2071 is provided with a dosing port, the bottom of the dosing tank 2071 is connected with the dosing pipe 2072, the metering pump 2073 is installed on the dosing pipe 2072, and the liquid medicine in the dosing tank 2071 is supplied into the cavity through the metering pump 2073; for the neutralization cavity 202, if the PH of the waste water cannot be neutralized to the required range after the liquid medicine is added into the neutralization cavity 202, the metering pump 2073 will be controlled to further add liquid medicine into the neutralization cavity 202, of course, for the sedimentation cavity 203 and the flocculation cavity 204, the metering pump 2073 generally supplies corresponding metering liquid medicine into the cavity. Further, the dosing tank 2071 is provided with a fifth liquid level sensor 2074 for detecting the medicine, if the fifth liquid level sensor in the dosing tank 2071 detects that the liquid medicine in it is lower than a certain height, the control equipment 20 will remind the system controller to add liquid medicine. Specifically, the outer side wall of the treatment tank 201 is provided with a second motor 208 and three chain wheels 209 arranged from top to bottom, the three chain wheels 209 are connected through a chain transmission, the inside of the neutralization cavity 202, the sedimentation cavity 203 and the flocculation cavity 204 is provided with stirring vanes 210, the three chain wheels 209 correspond to the three stirring vanes 210 in the inside of the neutralization cavity 202, the sedimentation cavity 203 and the flocculation cavity 204 respectively, the stirring shafts of the three stirring vanes 210 are respectively correspondingly transmission connected with the three chain wheels 209, so that the inside of the neutralization cavity 202, the sedimentation cavity 203 and the flocculation cavity 204 can be stirred, and the reaction is accelerated.

[0026] Specifically, the solid-liquid separation equipment 3 comprises a thickening tank, here the thickening tank adopts gravity sludge discharge, if the sludge level sensor 13 detects that the sludge level reaches a certain height (here it cannot exceed the drain port of the thickening tank), it proves that the thickening tank needs to discharge sludge, of course, a mechanical sludge discharge assembly such as a lead screw mechanism and a push plate can also be arranged at the bottom of the thickening tank to push the sludge to the sludge discharge port, so that the discharge speed of the sludge is faster. Here, the drain port of the thickening tank is communicated with the third drainage pump 14, after the thickening tank is static for a period of time, the third drainage pump 14 supplies the supernatant into the filtering and neutralizing equipment 4.

[0027] Specifically, the filtering and neutralizing device 4 comprises a sand filter tank 401 and a reverse tank 402 connected in sequence, wherein the sand filter tank 401 is provided with a filter screen for filtering the sand, and the water inlet of the sand filter tank 401 is in communication with the water inlet of the third water pump 14. The water inlet of the reverse tank 402 is located at the upper end thereof, and the water outlet is located at the lower end thereof. The PH sensor 17 and the fourth liquid level sensor 15 are arranged in the reverse tank 402. The PH value of the waste water in the reverse tank 402 is adjusted by adding acid liquid. The PH sensor 17 monitors the PH value of the waste water in the reverse tank 402 at any time. When the PH value is adjusted to 7-8, the PH adjustment of the waste water in the reverse tank 402 is completed, and the waste water can be supplied to the membrane filtering device 5 for secondary filtration through the fourth water pump 16. Here, the sand filter tank can be provided with a backwashing pipe on the upper end thereof. The sand filter tank and the sand remaining in the sand filter tank can be backwashed by water supplied through the backwashing pipe, so as to ensure the filtering effect of the sand filter tank 401.

[0028] Specifically, the membrane filtering device 5 comprises a filtering tank 501, a special nanofiltration membrane 502 and a reverse osmosis membrane 503 arranged in the filtering tank 501. The water inlet of the filtering tank 501 is located at the upper end thereof, and the water outlet is located at the lower end thereof. The special nanofiltration membrane 502 and the reverse osmosis membrane 503 are arranged from top to bottom, so that the waste water passes through the special nanofiltration membrane 502 and the reverse osmosis membrane 503 in sequence for filtration. The impurities such as ions and microorganisms in the waste water are further separated from the waste water through the special nanofiltration membrane 502 and the reverse osmosis membrane 503, so that the raw water is changed into product water. Specifically, the pressure sensor is arranged on the inner side wall of the filtering tank 501 and above the special nanofiltration membrane 502, i.e. the pressure sensor is arranged at the water inlet side of the special nanofiltration membrane 502. If the surface of the special nanofiltration membrane 502 is easily blocked due to the attachment of pollutants, the filtered liquid filtered by the special nanofiltration membrane 502 will be reduced, which will correspondingly cause the water pressure in the filtering tank 501 above the special nanofiltration membrane 502 to increase, and then be detected by the pressure sensor. Thus, the pressure sensor will feed back to the control device 20 to obtain the signal that the special nanofiltration membrane 502 is blocked and needs to be cleaned. It should be noted that the water in the membrane filtering device 5 can be directly filtered through the special nanofiltration membrane 502 and the reverse osmosis membrane 503. Once the evaporation and crystallization device 6 needs to be supplied with water, the water can be directly supplied through the fourth water pump 16. Of course, in order to ensure the water supply speed of the evaporation and crystallization device 6, the fifth water pump 18 is arranged at the water outlet of the filtering tank 501, and the fifth water pump 18 is also opened to supply water to the evaporation and crystallization device 6.

[0029] Further, the surface of the special nanofiltration membrane 502 is prone to be blocked by the attachment of pollutants. The traditional cleaning method is mostly manual cleaning or chemical cleaning at regular intervals, which not only affects the service life of the membrane, but also reduces the filtration efficiency and recovery rate of the membrane due to untimely cleaning. In order to solve the above problems, the cleaning device is further arranged on the filter box 501. The cleaning device specifically comprises a linear driving assembly and a cleaning brush 507. The cleaning brush 507 is connected to the driving end of the linear driving assembly, and the lower end surface of the cleaning brush 507 abuts against the upper end surface of the special nanofiltration membrane 502. Under the driving of the linear driving assembly, the foreign matter on the upper end surface of the special nanofiltration membrane 502 is pushed into the foreign matter collecting box 504, so as to achieve the purpose of automatically cleaning the impurities on the surface of the special nanofiltration membrane 502 and ensure the filtration efficiency of the wastewater. Moreover, in order to avoid the fact that the special nanofiltration membrane 502 still has impurities on its surface after the cleaning brush 507 finishes cleaning the upper end surface of the special nanofiltration membrane 502, a cleaning piece is arranged in the foreign matter collecting box 504. When the cleaning brush 507 pushes the impurities on the surface of the special nanofiltration membrane 502 into the foreign matter collecting box 504, the lower end surface of the cleaning brush 507 can be in contact with the cleaning piece, so as to clean the impurities attached to the lower end surface of the cleaning brush 507, thereby avoiding the fact that the special nanofiltration membrane 502 is polluted again when the upper end surface of the special nanofiltration membrane 502 is cleaned again. At the same time, the pressure sensor is used in cooperation with the cleaning device. When the pressure sensor detects that the pressure increases and exceeds the preset value, the cleaning device is started to clean the upper end surface of the special nanofiltration membrane 502.

[0030] Specifically, the linear drive assembly includes a first motor 505 and a threaded rod 506. The first motor 505 is arranged on the outer side wall of the filter box 501 opposite the sundry collecting box 504. The threaded rod 506 is in transmission connection with the first motor 505 at one end and is rotatably arranged on the side wall of the sundry collecting box 504 at the other end. The cleaning brush 507 is threadedly connected to the threaded rod 506. The cleaning brush 507 is provided with a guide plate which is slidably arranged on the inner side wall of the filter box 501. Thus, under the rotation of the first motor 505 and the threaded rod 506, the cleaning brush 507 can move from the end of the special nanofiltration membrane 502 away from the sundry collecting box 504 to the end of the sundry collecting box 504 and abut against the cleaning member in the sundry collecting box 504. It should be noted that when the cleaning device cleans the surface of the special nanofiltration membrane 502, the fourth hydrophobic pump 16 should be closed, and the fifth hydrophobic pump 18 is used to discharge the wastewater in the filter box 501. At least the wastewater does not cover the special nanofiltration membrane 502. Here, the liquid pressure of the pressure sensor is zero. Moreover, the impurities after cleaning are located in the sundry collecting box 504. The bottom or side end of the sundry collecting box 504 is provided with a valve. The operator can open the valve to discharge the sundries in the sundry collecting box 504. It can be seen that when the wastewater is discharged, although the wastewater does not cover the special nanofiltration membrane 502, there is still wastewater in the sundry collecting box 504. The sundries will be discharged with the wastewater. Of course, the valve can be an electric valve. When the electric valve is opened, the sundries and wastewater in the sundry collecting box 504 can be actively discharged. After the discharge is completed, the valve can be closed.

[0031] Specifically, in order to improve the cleaning effect of the brush surface at the lower end of the cleaning brush 507, the cleaning member is provided as an elastic scraping piece 508. When the elastic scraping piece 508 is in contact with the cleaning brush 507, the cleaning brush 507 will force the elastic scraping piece 508 to deform, so that the elastic scraping piece 508 is in contact with the cleaning brush 507 for a longer time and is more likely to clean the impurities on the lower brush surface of the cleaning brush 507. Specifically, the elastic scraping piece 508 is provided as an arc surface, so that the contact area and contact time of the elastic scraping piece 508 with the brush surface in the cleaning brush 507 are longer, further ensuring the cleaning of the impurities on the lower brush surface of the cleaning brush 507, and avoiding the hard contact between the elastic scraping piece 508 and the lower brush surface of the cleaning brush 507 which may cause damage to the brush surface. Further, a plurality of protrusions 509 are arranged on the elastic scraping piece 508 and can be inserted into the inner brush surface of the cleaning brush 507 to clean the impurities.

[0032] Specifically, the water outlet of the filter tank 501 is provided with a flow sensor 510, which is connected with the control device 20. Specifically, the flow sensor 510 is used to detect the flow at the water outlet of the filter tank 501, so as to obtain the wastewater filtered out of the filter tank 501. If the flow value of the flow sensor 510 in a period of time is suddenly reduced (possibly due to pipe blockage or membrane hole blockage) or abnormally increased (possibly due to sealing failure of the membrane assembly), the operator will be prompted to maintain the membrane filtration device 5.

[0033] Preferably, the evaporation crystallization device 6 comprises a shell 601, an evaporation chamber 602 and a crystallization chamber 603 arranged in the shell 601, and the evaporation chamber 602 and the crystallization chamber 603 are arranged in an up-down distribution. The evaporation chamber 602 has a water inlet and is in communication with the water outlet of the filter tank 501 in the membrane filtration device 5. A rotating flow guide plate 604 is arranged between the evaporation chamber 602 and the crystallization chamber 603 for spacing the evaporation chamber 602 and the crystallization chamber 603. Specifically, the evaporation chamber 602 is provided with a heating device 605, and the evaporation chamber 602 has an air outlet. The wastewater in the evaporation chamber 602 is heated by the heating device 605 to concentrate the wastewater, and then the concentrated liquid enters the crystallization chamber 603 through the flow guide plate 604. The crystallization chamber 603 is provided with a stirring device 606. The stirring device 606 stirs the concentrated liquid by the fan blades. The stirring can prevent the crystal from depositing and caking, so as to promote the uniform growth of the crystal and improve the crystallization efficiency and purity. The salt finally crystallized is discharged from the crystallization chamber 603. Further, the outer surface of the shell 601 is fixed with a steam compression device 607. The air inlet of the steam compression device 607 is in communication with the air outlet of the shell 601, and the air outlets of the steam compression device 607 are in communication with the evaporation chamber 602 through pipelines. Thus, the steam generated by evaporation in the evaporation chamber 602 enters the steam compression device 607 for compression. The compressed steam is recycled to the heating device 605, so as to realize steam recycling and reduce energy consumption. Specifically, the stirring device 606 can be a combination of a motor and fan blades. The motor is arranged at the bottom of the shell 601, and the rotating shaft of the fan blades is connected with the output shaft of the motor. The fan blades are driven to rotate by the motor.

[0034] Specifically, in order to realize the rotation of the rotating plate, the outer side wall of the shell 601 is fixedly installed with a second motor 208, and the output shaft of the second motor 208 is fixedly connected with the flow guide plate 604, and the flow guide plate 604 is fixedly installed with a sealing strip at the contact end of the shell 601, wherein when the wastewater enters the evaporation chamber 602, the flow guide plate 604 is in a completely closed state (horizontal state), at this time, the evaporation chamber 602 forms a closed space, and the heating device 605 heats and evaporates the wastewater, and the steam enters the steam compressor through the air inlet pipe for recycling; wherein after a period of evaporation in the evaporation chamber 602 (the time set here can make the wastewater in the evaporation chamber 602 evaporate to a supersaturated state), the drive motor drives the flow guide plate 604 to rotate to 30°-45°, and the concentrated liquid flows into the crystallization chamber 603 under the action of gravity along the inclined flow guide plate 604, and after a period of flow guide (the operator sets the time), the control equipment 20 controls the flow guide plate 604 to rotate to 0° through the drive motor to restore the closed state, and the fifth water pump 18 continues to start to supply the liquid filtered through the membrane filtration equipment 5 to the evaporation chamber 602 for continuous evaporation and crystallization.

[0035] The above embodiments are only preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application. Any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the protection scope of the present application.

Claims

1. An intelligent treatment system for wastewater discharge from a thermal power plant, characterized in that, The device comprises a wastewater storage device, a wastewater treatment device, a solid-liquid separation device, a filtering and neutralizing device, a membrane filtering device, an evaporation crystallization device and a control device which are sequentially connected; The wastewater storage device is provided with a first liquid level sensor and is connected with the control device to ensure that the liquid level in the wastewater storage device is not lower than a preset height; The outlet of the wastewater storage device is provided with a first drainage pump, the wastewater treatment device is provided with a second liquid level sensor and a water quality sensor, and the first drainage pump, the second liquid level sensor and the water quality sensor are all connected with the control device; The outlet of the wastewater treatment device is provided with a second drainage pump, the solid-liquid separation device is provided with a third liquid level sensor and a sludge level sensor, the third liquid level sensor and the second drainage pump are used in cooperation and are both connected with the control device, and the sludge level sensor is connected with the control device to clean the sludge when the sludge level sensor detects that the sludge in the bottom of the solid-liquid separation device reaches a certain height; The outlet of the solid-liquid separation device is provided with a third drainage pump, the filtering and neutralizing device is provided with a fourth liquid level sensor, and the third drainage pump and the fourth liquid level sensor are used in cooperation and are both connected with the control device; The outlet of the filtering and neutralizing device is provided with a fourth drainage pump, the filtering and neutralizing device is provided with a PH sensor, and the PH sensor and the fourth drainage pump are used in cooperation and are both connected with the control device; The filtering upstream of the membrane filtering device is provided with a pressure sensor for detecting the water pressure in the membrane filtering device, and the fourth drainage pump and the pressure sensor are connected with the control device.

2. The processing system of claim 1, wherein, The wastewater treatment device comprises a treatment box, the treatment box is provided with a neutralizing cavity, a sedimentation cavity and a flocculation cavity from top to bottom, the upper portion of the neutralizing cavity is provided with a water inlet, and the water inlet is communicated with the first drainage pump; The bottom portions of the neutralizing cavity and the sedimentation cavity are respectively provided with a first electric valve and a second electric valve, and the second drainage pump is connected to the water outlet of the flocculation cavity; The water quality sensor and the second liquid level sensor are arranged in the neutralizing cavity.

3. The processing system of claim 2, wherein, The outer sidewalls of the neutralizing cavity, the sedimentation cavity and the flocculation cavity are respectively provided with a dosing assembly, the dosing assembly comprises a dosing box, a dosing pipe and a metering pump, the dosing box is communicated with the cavity of the treatment box through the dosing pipe, the dosing pipe is provided with the metering pump, the dosing box is provided with a fifth liquid level sensor for detecting the medicament, the fifth liquid level sensor, the metering pump and the control device are connected, and the metering pump is used in cooperation with the water quality sensor.

4. The processing system of claim 1, wherein, The filtering and neutralizing device comprises a sand filtering tank and a reverse adjusting box which are sequentially connected, the water inlet of the sand filtering tank is communicated with the water outlet of the third drainage pump, the water inlet of the reverse adjusting box is located at the upper end portion thereof, the water outlet is located at the lower end portion thereof, and the PH sensor and the fourth liquid level sensor are arranged in the reverse adjusting box.

5. The processing system of claim 1, wherein, The membrane filtration device comprises a filter box, a special nanofiltration membrane and a reverse osmosis membrane arranged in the filter box, wherein the special nanofiltration membrane and the reverse osmosis membrane are arranged from top to bottom, the water inlet of the filter box is located at the upper end thereof, and the water outlet is located at the lower end thereof, so that the wastewater is filtered by the special nanofiltration membrane and the reverse osmosis membrane in sequence.

6. The processing system of claim 5, wherein, The filter box is further provided with a cleaning device, and the sidewall of the filter box is further communicated with a sundry collecting box; the cleaning device comprises a linear driving assembly and a cleaning brush. The cleaning brush is connected to the driving end of the linear driving assembly, the lower end of the cleaning brush abuts against the upper end surface of the special nanofiltration membrane, and under the driving of the linear driving assembly, sundries on the upper end surface of the special nanofiltration membrane are pushed into the sundry collecting box. The sundry collecting box is provided with a cleaning member, so that when the cleaning brush enters the sundry collecting box and contacts the cleaning member, the sundries attached to the cleaning brush are cleaned. The pressure sensor is arranged on the inner sidewall of the filter box and located above the special nanofiltration membrane.

7. The processing system of claim 6, wherein, The linear driving assembly comprises a first motor and a threaded rod, the first motor is arranged on the outer sidewall of the filter box, one end of the threaded rod is in transmission connection with the first motor by penetrating through the filter box, the other end is rotatably arranged on the inner sidewall of the sundry collecting box, the cleaning brush is threadedly connected to the threaded rod, and the cleaning brush is slidably arranged on the inner sidewall of the filter box. The cleaning member is arranged as an elastic scraper, and a plurality of spaced convexities are arranged on the elastic scraper and can be inserted into the inner part of the brush surface of the cleaning brush.

8. The processing system of claim 5, wherein, The water outlet of the filter box is provided with a flow sensor and connected to the control device.

9. The processing system of claim 1, wherein, The evaporation crystallization device comprises a shell, an evaporation chamber and a crystallization chamber arranged in the shell, the evaporation chamber has a water inlet and is communicated with the water outlet of the membrane filtration device, and a flow guide plate is rotatably arranged between the evaporation chamber and the crystallization chamber. The evaporation chamber is provided with a heating device for evaporating the moisture of the wastewater into concentrated liquid, and the evaporation chamber has an air outlet. The crystallization chamber is provided with a stirring device for stirring the concentrated liquid to crystallize.

10. The processing system of claim 9, wherein, The outer surface of the shell is fixed with a steam compression device, the air inlet of the steam compression device is communicated with the air outlet of the shell, and the outlets thereof are communicated with the evaporation chamber.

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