CN111423035A - Chemical-free electric method combined treatment process system and method for circulating water of thermal power plant - Google Patents
Chemical-free electric method combined treatment process system and method for circulating water of thermal power plant Download PDFInfo
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- CN111423035A CN111423035A CN202010378235.XA CN202010378235A CN111423035A CN 111423035 A CN111423035 A CN 111423035A CN 202010378235 A CN202010378235 A CN 202010378235A CN 111423035 A CN111423035 A CN 111423035A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 240
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000001816 cooling Methods 0.000 claims abstract description 32
- PWHULOQIROXLJO-UHFFFAOYSA-N manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 21
- 239000011572 manganese Substances 0.000 claims abstract description 21
- 239000004576 sand Substances 0.000 claims abstract description 21
- 239000003814 drug Substances 0.000 claims abstract description 7
- 239000002351 wastewater Substances 0.000 claims description 41
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000006477 desulfuration reaction Methods 0.000 claims description 12
- 230000003009 desulfurizing Effects 0.000 claims description 12
- 238000010612 desalination reaction Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000010291 electrical method Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000005429 turbidity Methods 0.000 claims description 4
- 230000003139 buffering Effects 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims description 3
- 239000003002 pH adjusting agent Substances 0.000 claims 1
- 230000000144 pharmacologic effect Effects 0.000 claims 1
- 238000011001 backwashing Methods 0.000 description 12
- 239000010865 sewage Substances 0.000 description 12
- 239000000126 substance Substances 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 8
- 230000001954 sterilising Effects 0.000 description 8
- 238000004659 sterilization and disinfection Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- WQYVRQLZKVEZGA-UHFFFAOYSA-N Hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 4
- 238000011033 desalting Methods 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 238000005352 clarification Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000005686 electrostatic field Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 208000004434 Calcinosis Diseases 0.000 description 1
- 229960005069 Calcium Drugs 0.000 description 1
- 229960003563 Calcium Carbonate Drugs 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate dianion Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N Hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical compound [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 1
- 230000000844 anti-bacterial Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- FBEDQOZZWWECAJ-UHFFFAOYSA-M calcium;magnesium;hydroxide Chemical compound [OH-].[Mg+2].[Ca+2] FBEDQOZZWWECAJ-UHFFFAOYSA-M 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/4602—Treatment of water, waste water, or sewage by electrochemical methods for prevention or elimination of deposits
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
- C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
Abstract
The invention discloses a thermal power plant circulating water non-medicament electric method combined treatment process system and a method, wherein an outlet of a raw water tank is communicated with an inlet of a low-voltage electric descaling reactor, an outlet of the low-voltage electric descaling reactor is communicated with an inlet of an electric method concentration system through a multi-medium filter and a first intermediate water tank, a produced water outlet of the electric method concentration system is communicated with an inlet of a produced water tank through a second intermediate water tank, an electric method pH regulator and a manganese sand filter, an outlet of the produced water tank is communicated with an inlet of a cooling tower pool through a produced water pump, an outlet of the cooling tower pool is communicated with an inlet of the raw water tank, and a high-voltage electrostatic polarization device is arranged in the cooling tower pool.
Description
Technical Field
The invention belongs to the field of circulating water treatment of a thermal power plant, and relates to a circulating water non-chemical electrochemical combined treatment process system and method for the thermal power plant.
Background
The circulating cooling type power plant generally adopts a chemical dosing mode of adding acid, adding a water quality stabilizer and a bactericide, realizes scale inhibition, corrosion inhibition and sterilization treatment of a circulating water system, and ensures safe and stable operation of the circulating water system. However, the method has the disadvantages that the added medicaments are various, and secondary pollution exists on the water body; the dosage is difficult to control along with the fluctuation of water quality and water quantity, and in order to ensure the operation safety, most power plants adopt a crude overdose mode, which causes the operation cost of the medicament to be higher.
Along with the strict implementation of a pollution discharge license system, a coagulation clarification/softening pretreatment-membrane method desalting system is adopted by many thermal power plants to treat and recycle circulating sewage. However, in actual operation, because chemical agents are remained in the circulating water sewage, the coagulation clarification/softening pretreatment effect is poor, alumen ustum is fine and light, the sedimentation performance is poor, the tank is easy to turn over, and the subsequent ultrafiltration and reverse osmosis equipment is very easy to pollute and block.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for the chemical-free electric combined treatment process of circulating water of a thermal power plant, which can realize the whole-process chemical-free treatment of the circulating water system of a wet cooling unit.
In order to achieve the aim, the circulating water non-pharmacy electric method combined treatment process system of the thermal power plant comprises a raw water tank, a low-voltage electric descaling reactor, a multi-medium filter, a first intermediate water tank, an electric method concentration system, a second intermediate water tank, an electric method pH regulator, a manganese sand filter, a water production tank, a water production pump, a cooling tower pool, a wastewater collection pool and a desulfurization process water tank;
the outlet of the raw water tank is communicated with the inlet of the low-voltage electric descaling reactor, the outlet of the low-voltage electric descaling reactor is communicated with the inlet of the electric concentration system through the multi-medium filter and the first intermediate water tank, the produced water outlet of the electric concentration system is communicated with the inlet of the produced water tank through the second intermediate water tank, the electric pH regulator and the manganese sand filter, the outlet of the produced water tank is communicated with the inlet of the cooling tower pool through the produced water pump, the outlet of the cooling tower pool is communicated with the inlet of the raw water tank, and the cooling tower pool is internally provided with a high-voltage electrostatic polarization device.
The concentrated water outlet of the electric method concentration system is communicated with the inlet of the waste water collecting tank, and the outlet of the waste water collecting tank is communicated with the inlet of the desulfurization process water tank.
The outlet of the first middle water tank is communicated with the backwashing water inlet of the multi-media filter through a first backwashing pump, and the backwashing water outlet of the multi-media filter is communicated with the inlet of the wastewater collecting tank.
The raw water tank is communicated with the inlet of the low-voltage electric descaling reactor through a first water inlet pump, and the cleaning wastewater outlet of the low-voltage electric descaling reactor is communicated with the inlet of the wastewater collecting pool.
The bottom outlet of the first intermediate water tank is communicated with the cooling tower pool through a drainage pump.
The first intermediate water tank is communicated with the electric method concentration system through a second water inlet pump.
The second intermediate water tank is communicated with the inlet of the electric pH regulator through a third water inlet pump.
The cleaning wastewater outlet of the electric pH regulator is communicated with the inlet of the wastewater collecting tank.
The outlet of the water production tank is communicated with the backwashing water inlet of the manganese sand filter through a second backwashing pump, the backwashing water outlet of the manganese sand filter is communicated with the inlet of the wastewater collection tank, and the outlet of the wastewater collection tank is communicated with the desulfurization process water tank through a wastewater lifting pump.
The invention relates to a chemical-free electric method combined treatment process method for circulating water of a thermal power plant, which comprises the following steps of:
1) circulating water of a thermal power plant enters a raw water tank for buffering and homogenizing, then enters a low-voltage electric descaling reactor for electrolysis, alkalinity reduction and descaling treatment, and water output by the low-voltage electric descaling reactor enters a multi-medium filter for filtration to remove suspended matters and reduce turbidity;
2) the water output by the multi-media filter enters a first intermediate water tank, the water output by the first intermediate water tank is divided into two paths, one path of water enters a tower pool of a cooling tower, and the other path of water enters an electrical method concentration system for desalination;
3) and the produced water output by the electric method concentration system enters a second intermediate water tank and then enters an electric method pH regulator to regulate the pH value to be below 7, the water output by the electric method pH regulator enters a manganese sand filter for filtering, the water output by the manganese sand filter enters a produced water tank, the water output by the produced water tank enters a cooling tower pool, and the water in the cooling tower pool enters a raw water tank after being treated by a high-voltage electrostatic polarization device.
The invention has the following beneficial effects:
the invention relates to a thermal power plant circulating water non-medicament electric method combined treatment process system and a method, which realize the whole process treatment of circulating water and sewage by using a low-voltage electric descaling, high-voltage electrostatic polarization and electric method concentration combined treatment mode during specific operation, ensure the safe and stable operation of a circulating water system, and particularly have high descaling, anticorrosion and sterilization efficiency when a low-voltage electric descaling reactor and a high-voltage electrostatic polarization device are adopted to stabilize the quality of circulating water, and no medicament is added, so that the traditional circulating water chemical dosing treatment technology can be completely replaced, and the treatment and recycling difficulty of circulating water and sewage can be obviously reduced. In addition, the invention adopts the electric method concentration system to carry out desalination treatment on the circulating water sewage, only the pH value and the turbidity of the inlet water need to be controlled, thereby avoiding various operation problems of poor pretreatment sedimentation efficiency, easy pollution and blockage of subsequent membrane components and the like caused by residual chemical agents in the circulating water sewage, and effectively reducing the investment, the operation cost and the operation control difficulty. Meanwhile, the hypochlorite content in the produced water of the electrical method concentration system is increased, and the hypochlorite is recycled to the cooling tower to play a role in sterilization. Finally, the invention adopts the electric pH regulator to replace the traditional pH regulation by adding acid, avoids adding chemical agents again, simultaneously, the cathode of the electric pH regulator can deposit calcium and magnesium indissoluble matters, and has certain desalting effect, thereby realizing the zero-agent treatment of the whole process of the circulating water system of the wet cooling unit.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a raw water tank, 2 is a first water inlet pump, 3 is a low-voltage electric descaling reactor, 4 is a multi-medium filter, 5 is a first intermediate water tank, 6 is a first backwashing pump, 7 is a second water inlet pump, 8 is a water discharge pump, 9 is an electric method concentration system, 10 is a second intermediate water tank, 11 is a third water inlet pump, 12 is an electric method pH regulator, 13 is a manganese sand filter, 14 is a water production tank, 15 is a second backwashing pump, 16 is a water production pump, 17 is a high-voltage electrostatic polarization device, 18 is a wastewater collection tank, 19 is a wastewater lifting pump, and 20 is a desulfurization process water tank.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the system for the chemical-free and electric combined treatment process of the circulating water of the thermal power plant comprises a raw water tank 1, a low-voltage electric descaling reactor 3, a multi-medium filter 4, a first intermediate water tank 5, an electric concentration system 9, a second intermediate water tank 10, an electric pH regulator 12, a manganese sand filter 13, a water production tank 14, a water production pump 16, a cooling tower pool, a wastewater collection pool 18 and a desulfurization process water tank 20; the outlet of the raw water tank 1 is communicated with the inlet of the low-voltage electric descaling reactor 3, the outlet of the low-voltage electric descaling reactor 3 is communicated with the inlet of the electric concentration system 9 through the multi-medium filter 4 and the first intermediate water tank 5, the produced water outlet of the electric concentration system 9 is communicated with the inlet of the produced water tank 14 through the second intermediate water tank 10, the electric pH regulator 12 and the manganese sand filter 13, the outlet of the produced water tank 14 is communicated with the inlet of the cooling tower pool through the produced water pump 16, the outlet of the cooling tower pool is communicated with the inlet of the raw water tank 1, the high-voltage electrostatic polarization device 17 is arranged in the cooling tower pool, the concentrated water outlet of the electric concentration system 9 is communicated with the inlet of the waste water collecting pool 18, and the outlet of the waste water collecting pool 18 is communicated with the inlet of the desulfurization process water tank 20.
It should be noted that the outlet of the first intermediate water tank 5 is communicated with the backwash water inlet of the multimedia filter 4 through the first backwash pump 6, and the backwash water outlet of the multimedia filter 4 is communicated with the inlet of the wastewater collection tank 18; the raw water tank 1 is communicated with the inlet of the low-voltage electric descaling reactor 3 through a first water inlet pump 2, and the cleaning wastewater outlet of the low-voltage electric descaling reactor 3 is communicated with the inlet of a wastewater collecting pool 18; the bottom outlet of the first intermediate water tank 5 is communicated with a cooling tower pool through a drainage pump 8; the first intermediate water tank 5 is communicated with an electric method concentration system 9 through a second water inlet pump 7; the second intermediate water tank 10 is communicated with the inlet of an electric pH regulator 12 through a third water inlet pump 11; the cleaning wastewater outlet of the electric pH regulator 12 is communicated with the inlet of a wastewater collecting tank 18; the outlet of the water production tank 14 is communicated with the backwashing water inlet of the manganese sand filter 13 through a second backwashing pump 15, the backwashing water outlet of the manganese sand filter 13 is communicated with the inlet of the wastewater collection tank 18, and the outlet of the wastewater collection tank 18 is communicated with the desulfurization process water tank 20 through a wastewater lift pump 19.
The invention relates to a chemical-free electric method combined treatment process method for circulating water of a thermal power plant, which comprises the following steps of:
1) circulating water of a thermal power plant enters an original water tank 1 for buffering and homogenizing, then enters a low-voltage electric descaling reactor 3 for electrolysis, alkalinity reduction and descaling treatment, and water output by the low-voltage electric descaling reactor 3 enters a multi-medium filter 4 for filtering to remove suspended matters and reduce turbidity;
it should be noted that the low-voltage electric descaling reactor 3 is internally provided with a metal composite electrode connected with an external direct-current power supply, and when circulating water flows through a low-voltage electric field formed by a positive electrode and a negative electrode, a large amount of OH can be generated near a negative plate-A strong alkaline environment is formed, cations such as calcium, magnesium and the like in water are attracted and migrate to the cathode plate, and insoluble matters such as calcium carbonate, magnesium hydroxide and the like are generated and deposited on the cathode to play a role in descaling; the anode is oxidized to generate a large amount of active substances such as ozone, chlorine and the like, and the sterilization effect is achieved.
2) The water output by the multi-medium filter 4 enters a first intermediate water tank 5, the water output by the first intermediate water tank 5 is divided into two paths, one path of water enters a tower pool of a cooling tower, and the other path of water enters an electric method concentration system 9 for desalination treatment;
the electric concentration system 9 is internally provided with a cylinder electrode which is externally connected with a direct current power supply and adopts a matrix type grouping processing mode to adapt to different water quantity and water quality requirements. When the electrical concentration system 9 is used for desalting the circulating water sewage, ions with opposite charges in the solution are moved and adsorbed to the surface of an electrode under the action of an electric field, so that the ions in the circulating water sewage are removed, and the purposes of desalting and purifying are achieved. Meanwhile, chloride ions in the circulating water sewage can be electrolyzed in a large amount near the anode of the electric method concentration system 9 to generate hypochlorous acid, free chlorine and the like, the produced water plays a role of sterilization when being recycled to the cooling tower, the electric method concentration system 9 is flexible to assemble, and can be arranged in multiple stages according to the water quality requirement of the effluent so as to achieve the designed desalination rate and recovery rate. Generally, the recovery rate of the electric method concentration system 9 is between 70% and 95% and is adjustable, and the salt rejection rate is between 40% and 90% and is adjustable.
3) The produced water output by the electric method concentration system 9 enters a second intermediate water tank 10, then enters an electric method pH regulator 12 to regulate the pH value to be below 7, the water output by the electric method pH regulator 12 enters a manganese sand filter 13 to be filtered, the water output by the manganese sand filter 13 enters a water production tank 14, the water output by the water production tank 14 enters a cooling tower pool, and the water in the cooling tower pool enters a raw water tank 1 after being treated by a high-voltage electrostatic polarization device 17.
The high-voltage electrostatic polarization device 17 mainly utilizes the electrostatic field effect, that is, when the circulating water flow passes through the high-voltage electrostatic field formed by the positive electrode and the negative electrode, the dipole moment of the water molecule is increased to form polar water molecules, and the polar water molecules and Ca in the water are formed2+、Mg2+、CO3 2-、SO4 2-And Cl-The positive and negative ions attract each other to generate hydration, so that the ions cannot move freely, thereby preventing the formation of scale and slowing down Cl-The corrosion to the wall of the cathode and the high-scale-resistant function of the high-voltage electrostatic polarization device 17 provide a circulating water quality environment with higher alkalinity for the low-voltage electric descaling reactor 3, and promote the formation of carbonate scale on the low-voltage electric descaling reactor 3.
Along with the extension of the running time, the low-voltage electric descaling reactor 3 and the electric pH regulator 12 need to be descaled by electrode reversing, the original water tank 1 is used for washing, the scale substances removed from the surface of the cathode are discharged along with the washing water, and the generated cleaning wastewater of the low-voltage electric descaling reactor 3 is discharged to the wastewater collection tank 18.
After the electrodes of the electrical concentration system 9 are saturated, the electrodes are regenerated by applying reverse voltage, and the water is flushed from the first intermediate water tank 5, at this time, the charged particles adsorbed by the positive and negative plates are released into the flushing water, and the formed concentrated water is discharged to the wastewater collection tank 18.
When the multi-medium filter 4 and the manganese sand filter 13 are backwashed, the generated backwashing wastewater is discharged to the wastewater collection tank 18.
The water output from the wastewater collection tank 18 is finally discharged into a desulfurization process water tank 20 to be used as the water supplement of a desulfurization system.
In order to avoid the problems caused by the treatment of circulating water chemical agents, the circulating water treatment adopts low-voltage electric descaling and high-voltage electrostatic polarization technology to ensure the descaling, corrosion inhibition and sterilization effects of a circulating water system; the circulating water sewage treatment adopts an electrical method concentration technology, has the composite functions of desalination and sterilization, has low requirement on the water quality of the inlet water, does not need to set a complex pretreatment system, can avoid the problem that the membrane of the circulating water is easy to pollute and block due to the residual chemical agent, does not add any agent in the desalination process, and is favorable for reducing the recycling difficulty of subsequent concentrated water.
The low-voltage electric descaling, high-voltage electrostatic polarization and electric method concentration combined technology is used for a circulating water system of a thermal power plant, the process flow is simple, the adaptability to water quality is strong, the occupied area is small, the equipment is simple and easy to operate, the limitation of the traditional treatment technology of chemical dosing scale inhibition and circulating water sewage discharge membrane desalination can be broken through, the unique advantages of the low-voltage electric descaling, high-voltage electrostatic polarization and electric method concentration combined technology are utilized, the whole process of circulating water and circulating water sewage discharge water can be treated without chemical agents, the equipment investment and the operation cost are effectively reduced, and the economy of circulating water recycling treatment is improved.
Finally, the invention has the advantages of simple structure, strong adaptability to water quality, high efficiency of descaling, corrosion prevention and sterilization, controllable recovery rate and desalination rate of the electric concentration system through flexible combination of equipment, no addition of any medicament, avoidance of secondary pollution, environmental protection and high efficiency, and is a new technology for treating circulating water of a thermal power plant, and good economic benefit and environmental protection benefit.
Claims (9)
1. A thermal power plant circulating water non-medicament electric method combined treatment process system is characterized by comprising a raw water tank (1), a low-voltage electric descaling reactor (3), a multi-medium filter (4), a first middle water tank (5), an electric method concentration system (9), a second middle water tank (10), an electric method pH regulator (12), a manganese sand filter (13), a water production tank (14), a water production pump (16), a cooling tower pool, a waste water collecting pool (18) and a desulfurization process water tank (20);
an outlet of the raw water tank (1) is communicated with an inlet of a low-voltage electric descaling reactor (3), an outlet of the low-voltage electric descaling reactor (3) is communicated with an inlet of an electric method concentration system (9) through a multi-medium filter (4) and a first intermediate water tank (5), a produced water outlet of the electric method concentration system (9) is communicated with an inlet of a produced water tank (14) through a second intermediate water tank (10), an electric method pH regulator (12) and a manganese sand filter (13), an outlet of the produced water tank (14) is communicated with an inlet of a cooling tower pool through a produced water pump (16), an outlet of the cooling tower pool is communicated with an inlet of the raw water tank (1), and a high-voltage electrostatic polarization device (17) is arranged in the cooling tower pool;
the concentrated water outlet of the electric method concentration system (9) is communicated with the inlet of the waste water collecting tank (18), and the outlet of the waste water collecting tank (18) is communicated with the inlet of the desulfurization process water tank (20).
2. The thermal power plant circulating water non-pharmacological electric combined treatment process system as claimed in claim 1, wherein an outlet of the first intermediate water tank (5) is communicated with a backwash water inlet of the multi-media filter (4) through a first backwash pump (6), and a backwash water outlet of the multi-media filter (4) is communicated with an inlet of the wastewater collection tank (18).
3. The chemical-free electric combined treatment process system for the circulating water of the thermal power plant as claimed in claim 1, wherein the raw water tank (1) is communicated with the inlet of the low-voltage electric descaling reactor (3) through a first water inlet pump (2), and the cleaning wastewater outlet of the low-voltage electric descaling reactor (3) is communicated with the inlet of the wastewater collection tank (18).
4. The thermal power plant circulating water non-pharmacy electric combined treatment process system as claimed in claim 1, characterized in that the bottom outlet of the first intermediate water tank (5) is communicated with the cooling tower pool through a drainage pump (8).
5. The thermal power plant circulating water non-pharmacy electric-process combined treatment process system as claimed in claim 1, characterized in that the first intermediate water tank (5) is in communication with the electric-process concentration system (9) via a second water inlet pump (7).
6. The thermal power plant circulating water non-pharmacy electric-process combined treatment process system as claimed in claim 1, characterized in that the second intermediate water tank (10) is in communication with the inlet of the electric-process pH adjuster (12) via a third water inlet pump (11).
7. The system for the chemical-free and electric combined treatment process of the circulating water in the thermal power plant as claimed in claim 1, wherein a cleaning wastewater outlet of the electric pH regulator (12) is communicated with an inlet of the wastewater collection tank (18).
8. The thermal power plant circulating water non-pharmacy electric method combined treatment process system as claimed in claim 1, characterized in that the outlet of the water production tank (14) is communicated with the backwash water inlet of the manganese sand filter (13) through a second backwash pump (15), the backwash water outlet of the manganese sand filter (13) is communicated with the inlet of the wastewater collection tank (18), and the outlet of the wastewater collection tank (18) is communicated with the desulfurization process water tank (20) through a wastewater lift pump (19).
9. An agentless electric method combined treatment process method for circulating water of a thermal power plant is characterized in that the agentless electric method combined treatment process system for circulating water of a thermal power plant based on claim 1 comprises the following steps:
1) circulating water of a thermal power plant enters a raw water tank (1) for buffering and homogenizing, then enters a low-voltage electric descaling reactor (3) for electrolysis, alkalinity reduction and descaling treatment, and water output by the low-voltage electric descaling reactor (3) enters a multi-medium filter (4) for filtering to remove suspended matters and reduce turbidity;
2) the water output by the multi-medium filter (4) enters a first intermediate water tank (5), the water output by the first intermediate water tank (5) is divided into two paths, one path enters a tower pool of a cooling tower, and the other path enters an electrical method concentration system (9) for desalination treatment;
3) the produced water output by the electric method concentration system (9) enters a second intermediate water tank (10), then enters an electric method pH regulator (12) to regulate the pH value to be below 7, the water output by the electric method pH regulator (12) enters a manganese sand filter (13) to be filtered, the water output by the manganese sand filter (13) enters a produced water tank (14), the water output by the produced water tank (14) enters a cooling tower pool, and the water in the cooling tower pool enters a raw water tank (1) after being treated by a high-voltage electrostatic polarization device (17).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010378235.XA CN111423035A (en) | 2020-05-07 | 2020-05-07 | Chemical-free electric method combined treatment process system and method for circulating water of thermal power plant |
| PCT/CN2020/121837 WO2021223369A1 (en) | 2020-05-07 | 2020-10-19 | Chemical-free electric method combined treatment process system and method for circulating water of thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010378235.XA CN111423035A (en) | 2020-05-07 | 2020-05-07 | Chemical-free electric method combined treatment process system and method for circulating water of thermal power plant |
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| CN (1) | CN111423035A (en) |
| WO (1) | WO2021223369A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112979016A (en) * | 2021-04-28 | 2021-06-18 | 中国华能集团清洁能源技术研究院有限公司 | Circulating water sewage treatment and reuse system and method |
| CN113549936A (en) * | 2021-07-21 | 2021-10-26 | 张韦欣 | High-hardness high-chlorine wastewater descaling type electrolytic chlorine production device |
| WO2021223369A1 (en) * | 2020-05-07 | 2021-11-11 | 西安西热水务环保有限公司 | Chemical-free electric method combined treatment process system and method for circulating water of thermal power plant |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114314946A (en) * | 2022-01-25 | 2022-04-12 | 国网河北省电力有限公司电力科学研究院 | Method and system for reusing circulating water sewage in desulfurization process water |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07500286A (en) * | 1992-03-30 | 1995-01-12 | ||
| CN204779066U (en) * | 2015-04-30 | 2015-11-18 | 常州龙天金属制品有限公司 | High voltage static water processing system |
| CN206089128U (en) * | 2016-10-17 | 2017-04-12 | 武汉威蒙环保科技有限公司 | Electrochemistry pH adjusting device |
| CN111056676A (en) * | 2019-12-23 | 2020-04-24 | 西安西热水务环保有限公司 | Electrodialysis desalination treatment system and method for circulating water and sewage of thermal power plant |
| CN111302540A (en) * | 2020-02-27 | 2020-06-19 | 河北铄宇环保科技股份有限公司 | Thermal power plant desulfurization wastewater electrolytic adsorption treatment system and treatment method |
| CN111423035A (en) * | 2020-05-07 | 2020-07-17 | 西安西热水务环保有限公司 | Chemical-free electric method combined treatment process system and method for circulating water of thermal power plant |
-
2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021223369A1 (en) * | 2020-05-07 | 2021-11-11 | 西安西热水务环保有限公司 | Chemical-free electric method combined treatment process system and method for circulating water of thermal power plant |
| CN112979016A (en) * | 2021-04-28 | 2021-06-18 | 中国华能集团清洁能源技术研究院有限公司 | Circulating water sewage treatment and reuse system and method |
| CN113549936A (en) * | 2021-07-21 | 2021-10-26 | 张韦欣 | High-hardness high-chlorine wastewater descaling type electrolytic chlorine production device |
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| WO2021223369A1 (en) | 2021-11-11 |
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