CN111423035B - Combined treatment process system and method for circulating water of thermal power plant through chemical-free electrotechnology - Google Patents
Combined treatment process system and method for circulating water of thermal power plant through chemical-free electrotechnology Download PDFInfo
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- CN111423035B CN111423035B CN202010378235.XA CN202010378235A CN111423035B CN 111423035 B CN111423035 B CN 111423035B CN 202010378235 A CN202010378235 A CN 202010378235A CN 111423035 B CN111423035 B CN 111423035B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 234
- 238000000034 method Methods 0.000 title claims abstract description 55
- 230000008569 process Effects 0.000 title claims abstract description 31
- 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
- 239000000126 substance Substances 0.000 claims abstract description 20
- 230000010287 polarization Effects 0.000 claims abstract description 15
- 239000002351 wastewater Substances 0.000 claims description 42
- 238000006477 desulfuration reaction Methods 0.000 claims description 12
- 230000023556 desulfurization Effects 0.000 claims description 12
- 238000010612 desalination reaction Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 239000010865 sewage Substances 0.000 description 9
- 230000001954 sterilising effect Effects 0.000 description 8
- 238000004659 sterilization and disinfection Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 239000013043 chemical agent Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000005764 inhibitory process Effects 0.000 description 5
- 239000003814 drug Substances 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000011033 desalting Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 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
- 238000005536 corrosion prevention Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005686 electrostatic field Effects 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- -1 Ca 2+ Chemical class 0.000 description 1
- 208000004434 Calcinosis Diseases 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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- 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-chemical electric combined treatment process system and a method, wherein an outlet of a raw water tank is communicated with an inlet of a piezoelectric descaling reactor, an outlet of the piezoelectric descaling reactor is communicated with an inlet of an electric concentration system through a multi-medium filter and a first intermediate water tank, a water outlet of the electric concentration system is communicated with an inlet of the water tank through a second intermediate water tank, an electric pH regulator and a manganese sand filter, an outlet of the water tank is communicated with an inlet of a cooling tower pool through a water producing 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 treatment of circulating water of a thermal power plant, and relates to a chemical-free chemical-free combined treatment process system and method for circulating water of a thermal power plant.
Background
The chemical dosing mode of adding acid, water quality stabilizer and bactericide is generally adopted in the circulating cooling type power plant, so that scale inhibition, corrosion inhibition and sterilization treatment of a circulating water system are realized, and safe and stable operation of the circulating water system is ensured. However, the method has various types of the added medicaments and causes secondary pollution to the water body; the dosage is difficult to regulate along with fluctuation of water quality and water quantity, and in order to ensure operation safety, most power plants adopt a rough excessive dosage mode, so that the operation cost of the medicament is higher.
With the strict implementation of a pollution discharge license system, many thermal power plants adopt a coagulation clarification/softening pretreatment-membrane method desalination system to treat and recycle the circulating water sewage. However, in actual operation, due to residual chemical agents in the circulating water, the coagulation clarification/softening pretreatment effect is poor, alum flowers are fine, light in weight and poor in sedimentation performance, a pond is easy to turn over, and subsequent ultrafiltration and reverse osmosis equipment is extremely easy to block.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a thermal power plant circulating water non-chemical and electrical combined treatment process system and method, which can realize the whole-process zero chemical treatment of a wet cooling unit circulating water system.
In order to achieve the aim, the chemical-free electric combined treatment process system for the circulating water of the thermal power plant comprises a raw water tank, a piezoelectric descaling reactor, a multi-medium filter, a first intermediate water tank, an electric concentration system, a second intermediate water tank, an electric pH regulator, a manganese sand filter, a water production tank, a water production pump, a cooling tower tank, a wastewater collection tank and a desulfurization process water tank;
The outlet of the original water tank is communicated with the inlet of the low-voltage descaling reactor, the outlet of the low-voltage descaling reactor is communicated with the inlet of the electric concentration system through a multi-medium filter and a first intermediate water tank, the water outlet of the electric concentration system is communicated with the inlet of the water tank through a second intermediate water tank, an electric pH regulator and a manganese sand filter, the outlet of the water tank is communicated with the inlet of a cooling tower pool through a water producing pump, the outlet of the cooling tower pool is communicated with the inlet of the original water tank, and a high-voltage electrostatic polarization device is arranged in the cooling tower pool.
The concentrated water outlet of the electric concentrating system is communicated with the inlet of a wastewater collecting tank, and the outlet of the wastewater collecting tank is communicated with the inlet of a desulfurization process water tank.
The outlet of the first intermediate water tank is communicated with a backwash water inlet of the multi-medium filter through a first backwash pump, and the backwash water outlet of the multi-medium filter is communicated with an inlet of the wastewater collection tank.
The raw water tank is communicated with the inlet of the piezoelectric descaling reactor through a first water inlet pump, and the cleaning wastewater outlet of the piezoelectric descaling reactor is communicated with the inlet of the wastewater collecting tank.
The bottom outlet of the first intermediate water tank is communicated with a cooling tower pool through a drainage pump.
The first intermediate water tank is communicated with the electric concentration system through a second water inlet pump.
The second intermediate water tank is communicated with an 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 collection tank.
The outlet of the water producing tank is communicated with the backwash water inlet of the manganese sand filter through a second backwash pump, the backwash water outlet of the manganese sand filter is communicated with the inlet of the wastewater collecting tank, and the outlet of the wastewater collecting tank is communicated with the desulfurization process water tank through a wastewater lifting pump.
The invention relates to a combined treatment process method for circulating water non-chemical electricity of a thermal power plant, which comprises the following steps:
1) The circulating water of the thermal power plant enters a raw water tank for buffering and homogenizing, then enters a piezoelectric descaling reactor for electrolysis, alkalinity reduction and descaling treatment, and water output by the piezoelectric descaling reactor enters a multi-medium filter for filtering so as to remove suspended matters and reduce turbidity;
2) The water output by the multi-medium filter enters a first intermediate water tank, the water output by the first intermediate water tank is divided into two paths, one path enters a cooling tower pool, and the other path enters an electric concentration system for desalination treatment;
3) The produced water output by the electric concentration system enters a second intermediate water tank, then enters an electric pH regulator to regulate the pH value to be less than 7, the water output by the electric pH regulator enters a manganese sand filter for filtering, the water output by the manganese sand filter enters the 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 the original water tank after being treated by a high-voltage electrostatic polarization device.
The invention has the following beneficial effects:
The thermal power plant circulating water chemical and electrical combined treatment process system and method realize the whole process treatment of circulating water and sewage by utilizing the combined treatment modes of piezoelectric descaling, high-voltage electrostatic polarization and electrical concentration when the thermal power plant circulating water chemical and electrical combined treatment process system and method are specifically operated, ensure the safe and stable operation of a circulating water system, particularly, the thermal power plant circulating water chemical and electrical combined treatment process system and method has high descaling, corrosion prevention and sterilization efficiency when the circulating water quality is stabilized by adopting a piezoelectric descaling reactor and a high-voltage electrostatic polarization device, and no medicament is added, so that the thermal power plant circulating water chemical and electrical combined treatment process system and method can completely replace the traditional circulating water chemical and chemical dosing treatment technology, and simultaneously can obviously reduce the treatment and recycling difficulty of circulating water sewage. In addition, the invention adopts the electric concentration system to carry out desalination treatment on the circulating water sewage, only controls the pH value and turbidity of the inlet water, avoids a plurality of operation problems of poor sedimentation efficiency of pretreatment, easy fouling and blocking of a subsequent membrane component and the like caused by residual chemical agents of the circulating water sewage, and effectively reduces investment, operation cost and operation control difficulty. Meanwhile, the hypochlorite content in the water produced by the electric concentration system is increased, and the water is recycled to the cooling tower to play a role in sterilization. Finally, the invention adopts the electric pH regulator to replace the traditional acid adding to regulate the pH value, and again avoids the addition of chemical agents, and simultaneously, the cathode of the electric pH regulator can deposit calcium magnesium indissolvable substances and also has a certain desalting effect, thereby realizing the zero-chemical treatment of the whole process of the circulating water system of the wet cooling unit.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Wherein 1 is a raw water tank, 2 is a first water inlet pump, 3 is a piezoelectric scale removal reactor, 4 is a multi-medium filter, 5 is a first intermediate water tank, 6 is a first backwash pump, 7 is a second water inlet pump, 8 is a drainage pump, 9 is an electric concentration system, 10 is a second intermediate water tank, 11 is a third water inlet pump, 12 is an electric pH regulator, 13 is a manganese sand filter, 14 is a water production tank, 15 is a second backwash pump, 16 is a water production pump, 17 is a high-voltage electrostatic polarization device, 18 is a waste water collecting tank, 19 is a waste water lifting pump, and 20 is a desulfurization process water tank.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
Referring to fig. 1, the chemical-free electric combined treatment process system for circulating water of a thermal power plant comprises a raw water tank 1, a piezoelectric 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 tank, a wastewater collection tank 18 and a desulfurization process water tank 20; the outlet of the original water tank 1 is communicated with the inlet of the low-voltage descaling reactor 3, the outlet of the low-voltage 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 water outlet of the electric concentration system 9 is communicated with the inlet of the water producing tank 14 through the second intermediate water tank 10, the electric pH regulator 12 and the manganese sand filter 13, the outlet of the water producing tank 14 is communicated with the inlet of the cooling tower pool through the water producing pump 16, the outlet of the cooling tower pool is communicated with the inlet of the original water tank 1, the cooling tower pool is internally provided with the high-voltage electrostatic polarization device 17, the concentrated water outlet of the electric concentration system 9 is communicated with the inlet of the wastewater collecting pool 18, and the outlet of the wastewater collecting pool 18 is communicated with the inlet of the desulfurization process water tank 20.
The outlet of the first intermediate water tank 5 is communicated with the backwash water inlet of the multi-medium filter 4 through the first backwash pump 6, and the backwash water outlet of the multi-medium 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-pressure electric descaling reactor 3 through the first water inlet pump 2, and the cleaning wastewater outlet of the low-pressure electric descaling reactor 3 is communicated with the inlet of the wastewater collecting tank 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 concentration system 9 through a second water inlet pump 7; the second intermediate water tank 10 is communicated with the inlet of the electric pH regulator 12 through a third water inlet pump 11; the cleaning wastewater outlet of the electric pH adjustor 12 is communicated with the inlet of the wastewater collection tank 18; the outlet of the water producing 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 a wastewater collecting tank 18, and the outlet of the wastewater collecting tank 18 is communicated with a desulfurization process water tank 20 through a wastewater lifting pump 19.
The invention relates to a combined treatment process method for circulating water non-chemical electricity of a thermal power plant, which comprises the following steps:
1) The circulating water of the 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, and the water output by the low-voltage electric descaling reactor 3 enters a multi-medium filter 4 for filtering so as to remove suspended matters and reduce turbidity;
the metal composite electrode is arranged in the piezoelectric descaling reactor 3 and is connected with an external direct current power supply, when circulating water flows through a piezoelectric field formed by the positive electrode and the negative electrode, a large amount of OH - is generated near the negative plate to form a strong alkaline environment, cations such as calcium, magnesium and the like in the water are attracted to migrate to the negative plate, and insoluble matters such as calcium carbonate, magnesium hydroxide and the like are generated to deposit on the negative plate 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, which play a role in sterilization.
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 cooling tower pool, and the other path enters an electric concentration system 9 for desalination treatment;
The electroconcentration system 9 is internally provided with a cylinder electrode which is externally connected with a direct current power supply and adopts a matrix grouping treatment mode so as to adapt to the requirements of different water quantities and water quality. When the electric method concentration system 9 is used for desalting the circulating water sewage, ions with opposite charges in the solution are moved and adsorbed on the surface of the electrode mainly by utilizing 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 wastewater can be electrolyzed in a large amount near the anode of the electric concentration system 9 to generate hypochlorous acid, free chlorine and the like, the produced water can play a role in sterilization when being recycled to the cooling tower, the electric concentration system 9 is assembled flexibly, and the electric concentration system can be arranged in multiple stages according to the water quality requirement of the discharged water so as to achieve the design of desalination rate and recovery rate. Typically, the recovery rate of the electroconcentration system 9 is between 70% and 95% and is adjustable, and the desalination rate is between 40% and 90% and is adjustable.
3) The produced water output by the electric concentration system 9 enters the second intermediate water tank 10 and then enters the electric pH regulator 12 to regulate the pH value to be less than 7, the water output by the electric pH regulator 12 enters the manganese sand filter 13 for filtering, the water output by the manganese sand filter 13 enters the produced water tank 14, the water output by the produced water tank 14 enters the cooling tower pool, and the water in the cooling tower pool enters the raw water tank 1 after being treated by the high-voltage electrostatic polarization device 17.
The high-voltage electrostatic polarization device 17 mainly utilizes the electrostatic field effect, namely, the dipole moment of water molecules is increased when circulating water flows through a high-voltage electrostatic field formed by positive and negative electrodes to form polar water molecules, and the polar water molecules are attracted with positive and negative ions such as Ca 2+、Mg2+、CO3 2-、SO4 2-, cl - and the like in water to generate hydration effect, so that the polar water molecules cannot move freely, scale formation is prevented, corrosion of Cl - on the wall of a cathode is slowed down, the high-scale inhibition effect of the high-voltage electrostatic polarization device 17 provides a circulating water quality environment with higher alkalinity for the low-voltage descaling reactor 3, and the formation of carbonate scale on the low-voltage descaling reactor 3 is promoted.
Along with the extension of the running time, the piezoelectric descaling reactor 3 and the electric pH regulator 12 need to carry out descaling treatment through a reverse pole, and the raw water tank 1 is used for flushing, at the moment, the scale substances removed from the surface of the cathode are discharged along with flushing water, and the generated cleaning wastewater of the piezoelectric descaling reactor 3 is discharged to the wastewater collection tank 18.
After the electrode adsorption of the electroconcentration system 9 is saturated, the electrode needs to be regenerated by applying reverse voltage, and the first intermediate water tank 5 is used for flushing water, at the moment, charged particles adsorbed by the positive and negative plates are released into flushing water, and the formed concentrated water is discharged to the wastewater collection tank 18.
When the multi-media filter 4 and the manganese sand filter 13 are backwashed, the backwashed waste water generated is discharged to the waste water collecting tank 18.
The water output from the wastewater collection tank 18 is finally discharged to a desulfurization process water tank 20 for use as desulfurization system make-up water.
In order to avoid the problems caused by the treatment of the circulating water chemical agent, the circulating water treatment adopts the technology of piezoelectric descaling and high-voltage electrostatic polarization, so that the descaling, corrosion inhibition and sterilization effects of the circulating water system are ensured; the circulating water sewage treatment adopts an electric concentration technology, has the composite functions of desalination and sterilization, has low requirement on water quality of inflow water, does not need to be provided with a complex pretreatment system, can avoid the problem that the membrane of the circulating water is easy to be blocked due to residual chemical agents, does not add any chemical agents in the desalination process, and is beneficial to reducing the recycling difficulty of subsequent concentrated water.
The combined technology of low-voltage electric descaling, high-voltage electrostatic polarization and electric concentration is used for a circulating water system of a thermal power plant, has simple process flow, strong adaptability to water quality, small occupied area and simple and easy operation equipment, can break through the limitations of the traditional technology of chemical dosing scale inhibition and circulating water pollution discharge water film desalination, utilizes the unique advantages of the combined technology of low-voltage electric descaling, high-voltage electrostatic polarization and electric concentration, can realize the non-chemical treatment of the whole process of circulating water and circulating water sewage, effectively reduces equipment investment and operation cost, and improves the economical efficiency of circulating water recycling treatment.
Finally, the invention has simple structure, strong adaptability to water quality, high descaling, corrosion prevention and sterilization efficiency, the recovery rate and the desalination rate of the electric concentration system can be controlled by flexible combination of equipment, no medicament is added, secondary pollution is avoided, and the invention is a novel environment-friendly and efficient circulating water treatment technology of a thermal power plant, and has good economic benefit and environmental protection benefit.
Claims (1)
1. The thermal power plant circulating water non-chemical electric method combined treatment process method is characterized by being based on a thermal power plant circulating water non-chemical electric method combined treatment process system, wherein the thermal power plant circulating water non-chemical electric method combined treatment process system comprises a raw water tank (1), a low-voltage 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 tank, a waste water collecting tank (18) and a desulfurization process water tank (20);
The outlet of the original water tank (1) is communicated with the inlet of the low-voltage descaling reactor (3), the outlet of the low-voltage 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 water outlet of the electric concentration system (9) is communicated with the inlet of the water production tank (14) through the second intermediate water tank (10), the electric pH regulator (12) and the manganese sand filter (13), the outlet of the water production tank (14) is communicated with the inlet of the cooling tower pool through the water production pump (16), and the outlet of the cooling tower pool is communicated with the inlet of the original 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 a wastewater collection tank (18), and the outlet of the wastewater collection tank (18) is communicated with the inlet of a desulfurization process water tank (20);
The outlet of the water producing tank (14) is communicated with a 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 a wastewater collecting tank (18), and the outlet of the wastewater collecting tank (18) is communicated with a desulfurization process water tank (20) through a wastewater lifting pump (19);
the method comprises the following steps:
1) The circulating water of the thermal power plant enters a raw water tank (1) for buffering and homogenizing, then enters a piezoelectric descaling reactor (3) for electrolysis, alkalinity reduction and descaling, and the water output by the piezoelectric descaling reactor (3) enters a multi-medium filter (4) for filtering so as 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 cooling tower pool, and the other path enters an electric 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 less than 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);
the outlet of the first intermediate water tank (5) is communicated with a backwash water inlet of the multi-medium filter (4) through a first backwash pump (6), and the backwash water outlet of the multi-medium filter (4) is communicated with an inlet of a wastewater collection tank (18);
the raw water tank (1) is communicated with the inlet of the piezoelectric descaling reactor (3) through a first water inlet pump (2), and the cleaning wastewater outlet of the piezoelectric descaling reactor (3) is communicated with the inlet of the wastewater collecting tank (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 the electric concentration system (9) through the second water inlet pump (7);
the second intermediate water tank (10) is communicated with the inlet of the 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 the wastewater collection tank (18).
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| CN202010378235.XA CN111423035B (en) | 2020-05-07 | 2020-05-07 | Combined treatment process system and method for circulating water of thermal power plant through chemical-free electrotechnology |
| 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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| 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 |
| 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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