CN212609768U - Scale and scale inhibition and removal system for circulating cooling water of thermal power plant - Google Patents
Scale and scale inhibition and removal system for circulating cooling water of thermal power plant Download PDFInfo
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- CN212609768U CN212609768U CN202020985854.0U CN202020985854U CN212609768U CN 212609768 U CN212609768 U CN 212609768U CN 202020985854 U CN202020985854 U CN 202020985854U CN 212609768 U CN212609768 U CN 212609768U
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Abstract
A scale-resisting and descaling system for circulating cooling water of a thermal power plant comprises an ozone micro-nano bubble generating assembly and a honeycomb high-voltage static generating device which are arranged in a circulating water tank at intervals. The water quality of the drained water completely meets the requirement of environmental protection and standard discharge, and has the advantages of environmental protection, economy, no secondary pollution and good scale inhibition and removal effects. The method adopts high-voltage static composite ozone to be applied to a circulating cooling water system of a thermal power plant, aims at the conditions of large circulating water quantity of the thermal power plant, hard surface water quality of northern China and recycled urban domestic sewage as circulating water for water replenishing, adopts a purely physical honeycomb type high-voltage static system to be arranged on a suction well to surround the periphery of a suction port pipeline as main scale inhibition and scale removal equipment, uses an ozone micro-nano bubble system to act on the front end of a water pool of the suction well for assistance, and uses the superposed functions of scale inhibition, scale removal, sterilization and algae removal of 2 systems to achieve the purposes of scale inhibition, scale removal, sterilization and algae removal.
Description
Technical Field
The utility model relates to a water treatment technical field, especially a thermal power plant recirculated cooling water hinders dirty descaling system.
Background
Circulating water has been widely used in various fields of national economic production for a long time. The shortage of water resources in the world at present, how to effectively apply industrial circulating water has attracted attention of various industries, and the accurate and reasonable use of industrial circulating water to make it serve national economy to the utmost extent has become one of the important problems that people have been discussing all the time.
Usually, when the temperature of water is above 35 ℃, needle-shaped crystals are separated out and firmly attached to the wall of the container, and a thick layer of scale is gradually formed. Because the heat conductivity of the scale is very low, only 1/5-1/100 of steel is used, so that the heat efficiency is reduced, energy is wasted, and even equipment scrap or explosion occurs. At present, in most of domestic industrial fields, air conditioners, refrigeration, heat exchange, cooling circulation and boiler systems are easy to scale and breed bacteria and algae due to the problem of the quality of used cooling medium water, so that the energy consumption is increased to influence the heat exchange and cooling effects, and pipelines are blocked to destroy equipment to cause accidents.
The circulating cooling water accounts for more than 80% of the total water consumption of the thermal power plant. According to statistics, the water consumption of a water cooling unit with the capacity of 300MW is about 30000-40000 t/h, and the water consumption of a water cooling unit with the capacity of 1000MW is about that of a small and medium-sized city. The circulating cooling water used in the thermal power plant is large in consumption and has certain requirements on water quality, and as the circulating cooling water flows through the cooling tower to be contacted with the outside air, the water quantity in the cooling tower is lost due to evaporation, and further the concentration of substances and ions in the water is concentrated; the scale in the circulating cooling water is mainly made of CaCO3/Ca(PO4)2/CaSO4And the like. CaCO saturated with circulating cooling water flowing through the heat exchanger3And (4) crystallizing and precipitating. Thereby depositing on the surface of the heat exchanger to form scale. Meanwhile, a large amount of dust and oxygen in the air can be mixed in the circulating cooling water, partial carbon dioxide is released, the water quality is poor, and deposits such as scale and the like are formed on the wall surface of the heat exchanger, so that the heat exchange performance is reduced, and the load capacity of the water pump is increased. If scale is formedThe deposition on the heat exchange surface can also reduce the heat transfer efficiency of the equipment, and the explosion can cause production accidents in serious cases. Therefore, the circulating cooling water must be subjected to a stabilization treatment to meet the basic requirements for safe production.
There has been a long-felt and constant effort to find an effective way to eliminate the effects of scale. Mechanical method and acid-base method are adopted at first, but the former has high labor intensity, incomplete descaling and long period, and the latter is easy to corrode equipment, causing public hazard. Later, people mostly take measures of chemical agent replacement, softening and flocculation to remove calcium and magnesium salts in water for water supply pretreatment, and scale is prevented from being generated. However, the chemical agent treatment method generally has certain limitations, for example, the discharged circulating cooling water body is easy to cause the environmental water body to generate water bloom and red tide, the formula of the chemical agent is continuously changed and adjusted according to the change of the water quality in the operation process, and the operation cost is relatively high. The use of the chemical agents needs special operation, is difficult to control and troublesome to use, and the discharged water is difficult to treat in environment protection and high in treatment cost because a large amount of the chemical agents contain phosphorus.
The problems brought by the traditional water treatment method are as follows:
1. the water consumption of the system is increased, a large amount of water is discharged, and the water cost is indirectly increased;
2. the drug resistance of microorganisms requires timely and appropriate change of drugs, but the three problems of scaling, biomembrane and legionella cannot be thoroughly solved;
3. increased costs of system operation and maintenance;
4. with the environmental protection and the increasing standards of the regulations, the following are involved: a. the payment cost of water supply, drainage and sewage discharge is gradually increased; b. the circulating cooling water (untreated water) containing chemicals, pathogenic bacteria, etc. must not be discharged directly.
5. Technical management is complex and requires high operator service level.
The existing chemical treatment method can solve certain problems, but has the defects of incomplete scale prevention, high labor intensity, high cost, environmental pollution and the like.
In view of this, various countries have been devoted to the development of a physical method feed water pretreatment technology for the purpose of preventing scale formation and scaling.
The existing high-voltage electrostatic water treatment electrode (called ion bar) is used for scale inhibition, descaling, sterilization and algae removal of circulating water, is generally installed on a circulating water pipeline or specially designed special equipment, is applied to places with small circulating water quantity, such as circulating water for central air conditioning, hot water circulating water for heating, small-sized open circulating water systems and the like, and has low requirement on water resistance, and the length of the equipment is rarely more than 3 meters. In the case of a large circulating cooling water system of a thermal power plant, the circulating amount is tens of thousands and tens of thousands of cubic meters per hour, the depth of a water pool is more than 5 meters, and the purposes of scale inhibition and scale removal cannot be achieved. And because high voltage static water treatment electrode installs the surface of water in the pond below, under circulating water pressure and rivers impact, the circulating water can be followed high tension cable and infiltrated in the electrode, leads to the electrode to fall to press and lose function, even fuses and damages and destroys high voltage power supply. The service life is seriously shortened.
In addition, the foregoing has shown that the circulating cooling water system of the thermal power plant is very large, and long-term experiments and practical applications show that the scale inhibition and scale removal of the circulating cooling water system of the thermal power plant cannot be perfectly realized by the high-voltage static technology alone (the scale inhibition efficiency is only 35-60% in general), and a certain chemical agent needs to be supplemented. As described above, the chemical agent causes secondary pollution. Under the general situation that energy conservation and environmental protection are vigorously advocated in China, particularly in the northern China, the water replenishing of circulating cooling water of a thermal power plant adopts reclaimed water for reuse, the water quality of the replenished water is poor, the scale inhibition, descaling, sterilization and algae removal of the whole system become more complicated, and a single high-pressure electrostatic water treatment technology is more attentive.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a thermal power plant recirculated cooling water scale inhibition scale removal system that drainage quality of water accords with the requirement of environmental protection discharge to standard completely, environmental protection, economy, no secondary pollution, scale inhibition scale removal are effectual to solve above-mentioned problem.
A scale-resisting and descaling system for circulating cooling water of a thermal power plant comprises an ozone micro-nano bubble generating assembly and a honeycomb high-voltage static generating device which are arranged in a circulating water tank at intervals.
Furthermore, circulating water pond has shallow water district and suction well, and the degree of depth of suction well is greater than the degree of depth in shallow water district, and the micro-nano bubble of ozone takes place the subassembly and sets up in the bottom in shallow water district and be close to one side of suction well, and honeycomb high-voltage static electricity generating device sets up in the suction well.
Further, the depth of the shallow water area is 3-5 meters, and the depth of the water suction well is more than 5 meters.
Further, the ozone micro-nano bubble generation assembly comprises an air source ozone micro-nano bubble generator, a dissolved air pump connected with the air source ozone micro-nano bubble generator and an aeration device connected with the dissolved air pump.
Further, the air source ozone micro-nano bubble generator is a plate type ozone generator or a tubular type ozone generator.
Furthermore, the honeycomb type high-voltage static electricity generating device comprises a honeycomb type structure frame, a plurality of high-voltage static electricity water treatment electrodes arranged in the honeycomb type structure frame, a mounting bracket used for mounting the high-voltage static electricity water treatment electrodes in the honeycomb type structure frame, and a high-voltage power supply used for driving the high-voltage static electricity water treatment electrodes.
Furthermore, a plurality of partition boards are vertically arranged in the honeycomb structure frame, and the top of each partition board is provided with an inlet; the bottom of the honeycomb structure frame is provided with a confluence area, and the bottom of each partition board is provided with an outlet communicated with the confluence area; the mounting bracket is horizontally arranged in the partition board, and the high-voltage electrostatic water treatment electrode is vertically arranged on the mounting bracket.
Further, the top of the high-voltage electrostatic water treatment electrode is connected with a high-voltage power supply through a cable, and a PVC pipe is sleeved outside the cable.
Furthermore, the high-voltage electrostatic water treatment electrode comprises a metal rod body, an insulating layer sleeved outside the metal rod body, a connector connected with the top of the metal rod body and positioned in the insulating layer, a high-voltage connecting cable connected with the connector, a lower fluorine rubber plug positioned in the insulating layer and positioned below the bottom of the metal rod body, a lower end cover coated outside the bottom end of the insulating layer, an upper fluorine rubber plug arranged above the connector and positioned in the insulating layer, an upper end cover coated outside the top end of the insulating layer, and a PVC short straight joint arranged at the top of the upper end cover; the high-voltage connecting cable penetrates through the upper end cover and the PVC short straight joint and is connected with the cable; the PVC short straight joint is connected with the PVC pipe.
Further, the length of the high-voltage electrostatic water treatment electrode is 50-5000 mm, and the diameter of the high-voltage electrostatic water treatment electrode is 20-150 mm.
Compared with the prior art, the utility model discloses a thermal power plant recirculated cooling water hinders dirty scale removal system includes that the interval sets up the micro-nano bubble of ozone in circulating water pond and takes place subassembly and honeycomb high-voltage static generating device. The water quality of the drained water completely meets the requirement of environmental protection and standard discharge, and has the advantages of environmental protection, economy, no secondary pollution and good scale inhibition and removal effects.
Drawings
Embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of a circulating cooling water scale-removing system of a thermal power plant provided by the present invention.
Fig. 2 is a partially enlarged schematic view of fig. 1.
Fig. 3 is a schematic plan view of the circulating cooling water scale-inhibiting and removing system of the thermal power plant provided by the present invention.
Fig. 4 is a side sectional view of the high voltage electrostatic water treatment electrode of fig. 2.
Detailed Description
The following describes in further detail specific embodiments of the present invention based on the drawings. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
Referring to fig. 1, the scale-inhibiting and removing system for circulating cooling water of a thermal power plant provided by the present invention includes an ozone micro-nano bubble generating assembly 20 and a honeycomb high-voltage electrostatic generating device 30 disposed in a circulating water tank 10 at an interval, and a water suction pipe 40 having a first end disposed in the circulating water tank 10 near the honeycomb high-voltage electrostatic generating device 30.
The suction pipe 40 is connected to a heat exchange system by a centrifugal pump.
The circulation tank 10 has a shallow water region 110 and a suction well 120. The depth of the suction well 120 is greater than the depth of the shallow water region 110. The depth of the shallow water area 110 is 3-5 meters, and the depth of the suction well 120 is more than 5 meters.
The ozone micro-nano bubble generating assembly 20 is disposed at the bottom of the shallow water region 110 and near one side of the suction well 120. The honeycomb high-voltage electrostatic generator 30 is disposed in the suction well 120.
Referring to fig. 2 and 3, the ozone micro-nano bubble generating assembly 20 includes an air source ozone micro-nano bubble generator 21, a dissolved air pump 22 connected to the air source ozone micro-nano bubble generator 21, and an aeration device 23 connected to the dissolved air pump 22.
The air source ozone micro-nano bubble generator 21 is a plate type ozone generator or a tubular type ozone generator, and is preferably a plate type ozone generator.
The dissolved air pump 22 "dissolves" ozone in the recirculated cooling water in the micro-nano bubble mode to through aeration equipment 23 effect in recirculated cooling water, make ozone produce a large amount of hydroxyls when the microbubble bursts, organic matters such as COD that can the oxidative decomposition recirculated cooling water, kill bacterial algae simultaneously. The diameter of the micro-nano bubbles is 1-300 nanometers.
The aeration device 23 can be a plurality of titanium metal aeration discs, ceramic aeration discs, alumina aeration discs, nylon aeration discs and the like.
The ozone micro-nano bubble generation assembly 20 has the following functions:
1. strong bactericidal action: a small amount of ozone can play a role of a strong bactericide, and the drug resistance is not generated; ozone sterilization is mainly based on the oxidation capability of nascent oxygen generated after decomposition. Ozone first reacts with the double bonds of lipids in the cell wall, penetrates the cell wall and enters the cell, and acts on the outer shell lipoprotein and the inner lipopolysaccharide to change the permeability of the cell. Finally, the cells are thawed and die. Cooling water contains 0.1mg/l of ozone, and 70-80% of biological membranes can be destroyed after 3 hours; when 0.4mg/l of ozone remains in the water, 100% of bacteria generating the biofilm can be killed within 2-3 min. Maintaining this condition prevents regrowth. The speed of killing bacteria by ozone is 3200 times higher than that of chlorine, and the energy efficiency is 50 times higher. Ozone directly destroys cell walls, completely kills bacteria without producing immune drug resistance. The total colony number of the cooling tower circulating water after ozone treatment is 100-1000 cfu/ml, which is 1000-10000 times lower than that of 1000000cfu/ml after chemical treatment.
2. Eliminate the biomembrane, improve heat exchange efficiency: in a properly installed and operating system, the bacteria count is reduced and biofilm fouling of the heat exchanger surfaces is minimized.
3. Certain corrosion inhibition effect: ozone is a strong oxidant, the corrosion inhibiting mechanism is similar to that of chromate corrosion inhibitor, and the main reason is that after active oxygen atoms in cooling water react with ferrous ions, a layer containing gamma-Fe is formed on the surface of anode2O3An oxide passivation film of (1). The film is thin, compact and firmly combined with metal, and can prevent dissolved oxygen in water from diffusing to the surface of the metal, thereby inhibiting the progress of corrosion reaction. Meanwhile, due to the generation of the oxide film, the corrosion potential of the metal moves in the positive direction, and the corrosion rate is rapidly reduced. In addition, the ozone can effectively kill microorganisms such as sulfur-phagocytic iron and the like, and cut off a corrosion source. Experiments show that: the water quality after ozone treatment has the best anti-corrosion effect when the total alkalinity is controlled to be more than 240mg/l and the ORP is controlled to be less than 550.
4. Mechanism of ozone scale inhibition
Ozone, upon contact with water molecules, undergoes a reduction reaction to produce monatomic oxygen (O) and hydroxyl radicals (HO):
O3——O2+(O)
(O)+H2O——2OH
hydroxyl (OH) is a catalyst that enables the organic matter to undergo a chain reaction:
OH+RH——R·+H2O
R·+O2——RO2·
RO2·+RH——ROOH+R
ROOH——CO2
thus, the strong oxidizing properties of ozone effectively control the growth of microorganisms in the circulating water, reducing biofouling and its resulting under-scale corrosion. The ozone can not directly oxidize the scale components of calcium and magnesium salts, but only oxidize organic matter components in the substrate of the scale layer, so that the scale layer becomes loose and falls off, thereby playing the role of inhibiting scale.
The honeycomb high-voltage electrostatic generator 30 includes a honeycomb frame 31, a plurality of high-voltage electrostatic water treatment electrodes 32 disposed in the honeycomb frame 31, a mounting bracket 33 for mounting the high-voltage electrostatic water treatment electrodes 32 in the honeycomb frame 31, and a high-voltage power supply for driving the high-voltage electrostatic water treatment electrodes 32.
The honeycomb frame 31 is made of carbon steel, 304 stainless steel, 316 stainless steel or other conductive corrosion-resistant metal.
The honeycomb frame 31 has a plurality of partition plates 311 vertically disposed therein, and an inlet 312 is opened at the top of each partition plate 311. The inner diameter of each partition 311 is 30-150 cm.
The bottom of the honeycomb frame 31 is provided with a confluence section 314, and the bottom of each partition 311 is opened with an outlet 313 communicated with the confluence section 314.
The mounting bracket 33 is horizontally disposed in the partition plate 311, and the high-voltage electrostatic water treatment electrode 32 is mounted on the mounting bracket 33 in a vertical state.
The top of the high voltage electrostatic water treatment electrode 32 is connected to a high voltage power supply by a cable 34. The cable 34 is externally sleeved with a PVC pipe 35, and the PVC pipe 35 and the cable 34 pass through the inlet 312. PVC pipe 35 makes cable 34 separate with recirculated cooling water completely, has avoided recirculated cooling water to permeate high-pressure electrostatic water treatment electrode 32 through cable 34 and lead to high-pressure electrostatic water treatment electrode 32 to drop pressure and damage.
The first end of the barrel 40 is provided with a suction port 41, the suction port 41 being located in the confluence section 314.
The circulating cooling water enters the honeycomb type high-voltage electrostatic generating device 30 from the upper part, the high-voltage electrostatic water treatment electrode 32 generates a high-voltage electrostatic field, and the scale removing principle of the high-voltage electrostatic field is as follows:
the high-voltage electrostatic field achieves the purpose of scale inhibition and corrosion inhibition by changing the structure of water molecules.
Because the water molecules have polarity, the water molecules can generate polarization action to become water dipoles when being subjected to the action of a high-voltage electrostatic field, and are arranged in a chain-shaped orientation order, the positive end of each water dipole faces to the cathode of the electrostatic field, and the negative end of each water dipole faces to the anode of the electrostatic field. When water contains dissolved salts, the positive and negative ions of the salts are surrounded by water dipoles, can not move freely in the water and can not contact the wall of the water, so that the water can not deposit scale.
The water molecules generally exist in the form of water molecule groups, one water molecule group generally consists of 15-20 water molecules, and after the circulating cooling water is treated by a high-voltage electrostatic field, the water molecule groups are opened to become groups consisting of 4-6 water molecules, so that the circulating cooling water has higher dissolving capacity and super-strong permeability and is charged.
The dissociation constant of weak electrolyte is increased under the action of external electric field. The water molecule is also a very weak electrolyte, and dissociation thereof is inevitably increased under the action of a strong electric field. The water ionizes into hydrogen ions and hydroxide ions. OH-generated by water molecule ionization can be gathered near the positively charged ion bar, and H + can be gathered on the inner wall of the negatively charged conduit or container. The H + causes a localized low pH film to form on the inner surface of the tube. It is clear that the higher the applied electric field, the lower the PH of the surface, the greater the solubility of carbonates etc., and the lower the degree of supersaturation of salts in this local area. Under the condition that the electric field is strong enough, the solution in the local area can be even in an undersaturation state. This creates a physicochemical state on the inner wall surface of the tube that is not conducive to fouling. When the scaling substances are originally adhered to the surface of the pipeline, the concentration of H & lt + & gt on the surface is increased, so that insoluble substances such as calcium carbonate and magnesium carbonate adhered to the wall of the pipeline are changed into bicarbonate to be dissolved. On the other hand, the ion bar surface is opposite to the tube wall, and absorbs a large amount of OH-. This will increase the supersaturation of the solution, favoring the formation of scale. But because the surface of the ion bar is coated with a layer of PTFE, the ion bar is not easy to scale on the surface.
In the high-voltage electrostatic field, the electronic binding force between scale molecules can be destroyed, the crystal structure is changed, the scale is loosened, the dipole moment of the water molecules is increased, the hydration ability with salt molecules is enhanced, and the scale is gradually degraded and fallen off.
Principle of corrosion reduction: the high-voltage electrostatic circulating water treatment device unit is arranged in the high-voltage electrostatic circulating water treatment device, so that water molecules generate polarity and are orderly arranged, anions and cations are separated, and the transfer of electrons is blocked; the electric potential of water molecules is improved, similar to an anode sacrificial method, the anode sacrificial method achieves partial purposes by utilizing current, and no current flows between a water body and equipment under the action of a high-voltage electrostatic field, but the electric current tends to transfer electrons; the micro ozone generated in the water acts on the oxidation coating of the exposed pipeline, and the physical property change of the water molecules can effectively prevent the corrosion of the circulating water to the equipment.
Referring to fig. 4, the high voltage electrostatic water treatment electrode 32 includes a metal rod 321, an insulating layer 322 covering the metal rod 321, a connector 324 connected to the top of the metal rod 321 and located in the insulating layer 322, a high voltage cable 323 connected to the connector 324, a lower fluoro rubber plug 325 located in the insulating layer 322 and located below the bottom of the metal rod 321, a lower cap 326 covering the bottom of the insulating layer 322, an upper fluoro rubber plug 327 located above the connector 324 and located in the insulating layer 322, an upper cap 328 covering the top of the insulating layer 322, and a PVC short straight connector 329 disposed on the top of the upper cap 328.
The high voltage connection cable 323 passes through the upper end cap 328 and the PVC short straight connector 329. The high-voltage connection cable 323 is connected to the cable 34. The PVC short straight joint 329 is used for connecting the PVC pipe 35 by PVC paste or fusion welding with each other.
The upper fluororubber 327 and the lower fluororubber 325 are waterproof-sealed from both ends of the insulating layer 322 to protect the metal rod 321 inside and prevent electrical leakage.
The length of the high-voltage electrostatic water treatment electrode 32 is 50-5000 mm, and the diameter is 20-150 mm.
The high-voltage power supply is a self-made adjustable power supply, and the voltage of the power supply can be adjusted on site or remotely.
The amount of ozone in the whole circulating water is 0.005-1 g/m3。
The utility model provides a thermal power plant recirculated cooling water hinders dirty scale removal system still including set up in the quality of water sensor of water sucking mouth 41 department, with quality of water sensor, ozone micro-nano bubble take place the controller that subassembly 20 and high voltage power supply all are connected, the wireless transmission unit who is connected with the controller, with the server of wireless transmission unit communication and the intelligent terminal of server communication.
In test example 1, the circulation volume of 300MW unit of a certain thermal power plant is 21060m3The diameter of the circulating water pool is 50 meters, the water depth is 2 meters, the water absorption well depth is 3-7 meters, and the water supplementing quality is shown in the table 1:
TABLE 1 Water quality parameters for thermal power plant
Utilize the utility model discloses a thermal power plant recirculated cooling water hinders dirty scale removal system time, design the micro-nano bubble system of ozone, ozone generation system ozone emergence volume 2kg/h arranges 100 aeration dish in the circulating water pond in the shallower department (3 ~ 5 meters depths) of suction well.
Design honeycomb high voltage static water treatment system, 90 honeycomb holes, the hole diameter is 800mm, 90 high voltage static water treatment electrodes, every electrode length 3000mm, diameter 50mm, applys 35kv voltage.
After the system normally operates for 3 months, the overall water quality of the circulating cooling water is shown in table 2:
TABLE 2 Water quality parameters of recirculated cooling water of thermal power plant
Can see from table 1 and table 2, the utility model discloses a thermal power plant recirculated cooling water hinders dirt descaling system's scale inhibition performance is outstanding, and corrosion inhibition performance is fine, and concentration multiplying power has reached about 8 times, and system's circulating water ammonia nitrogen, total phosphorus hardly have detected, and COD is more had more decline than moisturizing. The drainage can be normally discharged without any pollution control.
In test example 2, 500MW unit of a certain power plant, circulation amount is 116960m3And h, the depth of the water absorption well is 3-8 meters, the water is discharged by urban domestic sewage, and the water quality meets the water quality requirement of the water supplement of an open circulating cooling water system in the urban sewage recycling industrial water quality standard (GB/T19923-2005). The water replenishing conditions are shown in table 3:
| serial number | Item | Unit of | Numerical value |
| 1 | Colour(s) | Light yellow | |
| 2 | Smell(s) | Is tasteless | |
| 3 | Dissolved solid matter | mg/L | 523 |
| 4 | Suspended matter | mg/L | 24.4 |
| 5 | Electrical conductivity of | μS/cm | 922.6 |
| 6 | pH | 7.44 | |
| 7 | Turbidity of water | FTU | 8.88 |
| 8 | Phenolphthalein basicity | mmol/L | 0 |
| 9 | Full alkalinity | mmol/L | 3.37 |
| 10 | Cl- | mg/L | 93.88 |
| 11 | SO4 2- | mg/L | 195.84 |
| 12 | Fe3+ | mg/L | 0.335 |
| 13 | Ca2+ | mg/L | 61.6 |
| 14 | Mg2+ | mg/L | 25.2 |
| 15 | Total hardness (1/2Ca2++1/2Mg2+) | mmol/L | 5.18 |
| 16 | All-silicon | mg/L | 4.1 |
| 17 | Active silicon | mg/L | 4.0 |
| 18 | CODcr | mg/L | 21.28 |
| 19 | Total phosphorus (in PO)4 3-) | mg/L | 0.022 |
| 20 | Orthophosphoric acid (in PO)4 3-) | mg/L | 0.022 |
| 21 | Free residual chlorine | mg/L | 0.1 |
| 22 | Ammonia nitrogen | mg/L | 0.295 |
TABLE 3 Water quality parameters for Power plant
Utilize the utility model discloses a thermal power plant recirculated cooling water scale inhibition scale removal system time, design ozone micro-nano bubble system ozone generator ozone emergence volume is 10kg/h, arranges 500 aeration dishes in the shallow department of circulating water pond (3 ~ 6 meters positions) in the circulating water pond.
600 holes of the honeycomb type high-voltage electrostatic water treatment system are designed, the diameter of the system is 700mm, and 600 high-voltage electrostatic water treatment electrodes are used. Each electrode was 3500mm in length and 60mm in diameter, and a voltage of 35kv was applied.
After the system normally operates for 1 month, the overall water quality of the circulating cooling water is shown in table 4:
TABLE 4 quality parameters of recirculated cooling water of power plant
Can see by table 3 table 4, the utility model discloses a thermal power plant circulating cooling water hinders dirty scale removal system's scale inhibition performance is outstanding, and corrosion inhibition performance is fine, and concentration multiplying power has reached about 7 times, and system's circulating water ammonia nitrogen, total phosphorus accord with the industrial water standard of decontaminating, and COD is more had more decline than moisturizing. The drainage can be normally discharged without any pollution control.
Compared with the prior art, the utility model discloses a thermal power plant recirculated cooling water hinders dirty scale removal system includes that the interval sets up the micro-nano bubble of ozone in circulating water pond 10 and takes place subassembly 20 and honeycomb high-voltage static generating device 30. The water quality of the drained water completely meets the requirement of environmental protection and standard discharge, and has the advantages of environmental protection, economy, no secondary pollution and good scale inhibition and removal effects.
The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention, and any modification, equivalent replacement or improvement within the spirit of the present invention is encompassed by the claims of the present invention.
Claims (10)
1. The utility model provides a thermal power plant recirculated cooling water scale control scale removal system which characterized in that: comprises an ozone micro-nano bubble generating assembly and a honeycomb high-voltage electrostatic generating device which are arranged in a circulating water tank at intervals.
2. The thermal power plant circulating cooling water scale removal system of claim 1, wherein: the circulating water tank is provided with a shallow water area and a water suction well, the depth of the water suction well is greater than that of the shallow water area, the ozone micro-nano bubble generating assembly is arranged at the bottom of the shallow water area and close to one side of the water suction well, and the honeycomb type high-voltage static generating device is arranged in the water suction well.
3. The thermal power plant circulating cooling water scale removal system of claim 2, wherein: the depth of the shallow water area is 3-5 meters, and the depth of the water suction well is more than 5 meters.
4. The thermal power plant circulating cooling water scale removal system of claim 2, wherein: the ozone micro-nano bubble generation assembly comprises an air source ozone micro-nano bubble generator, a dissolved air pump connected with the air source ozone micro-nano bubble generator and an aeration device connected with the dissolved air pump.
5. The thermal power plant circulating cooling water scale removal system of claim 4, wherein: the air source ozone micro-nano bubble generator is a plate type ozone generator or a tubular type ozone generator.
6. The thermal power plant circulating cooling water scale removal system of claim 2, wherein: the honeycomb type high-voltage static electricity generating device comprises a honeycomb type structure frame, a plurality of high-voltage static electricity water treatment electrodes arranged in the honeycomb type structure frame, a mounting bracket used for mounting the high-voltage static electricity water treatment electrodes in the honeycomb type structure frame, and a high-voltage power supply used for driving the high-voltage static electricity water treatment electrodes.
7. The thermal power plant circulating cooling water scale removal system of claim 6, wherein: a plurality of partition boards are vertically arranged in the honeycomb structural frame, and the top of each partition board is provided with an inlet; the bottom of the honeycomb structure frame is provided with a confluence area, and the bottom of each partition board is provided with an outlet communicated with the confluence area; the mounting bracket is horizontally arranged in the partition board, and the high-voltage electrostatic water treatment electrode is vertically arranged on the mounting bracket.
8. The thermal power plant circulating cooling water scale removal system of claim 6, wherein: the top of the high-voltage electrostatic water treatment electrode is connected with a high-voltage power supply through a cable, and a PVC pipe is sleeved outside the cable.
9. The thermal power plant circulating cooling water scale removal system of claim 8, wherein: the high-voltage electrostatic water treatment electrode comprises a metal rod body, an insulating layer sleeved outside the metal rod body, a connector connected with the top of the metal rod body and positioned in the insulating layer, a high-voltage connecting cable connected with the connector, a lower fluorine rubber plug positioned in the insulating layer and positioned below the bottom of the metal rod body, a lower end cover coated outside the bottom end of the insulating layer, an upper fluorine rubber plug arranged above the connector and positioned in the insulating layer, an upper end cover coated outside the top end of the insulating layer and a PVC short straight joint arranged at the top of the upper end cover; the high-voltage connecting cable penetrates through the upper end cover and the PVC short straight joint and is connected with the cable; the PVC short straight joint is connected with the PVC pipe.
10. The thermal power plant circulating cooling water scale removal system of claim 6, wherein: the length of the high-voltage electrostatic water treatment electrode is 50-5000 mm, and the diameter of the high-voltage electrostatic water treatment electrode is 20-150 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020985854.0U CN212609768U (en) | 2020-06-02 | 2020-06-02 | Scale and scale inhibition and removal system for circulating cooling water of thermal power plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115321694A (en) * | 2022-08-25 | 2022-11-11 | 华北电力大学（保定） | Circulating cooling system based on air micro-nano bubbles and scale inhibition method |
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