CN111777198A - Heat supply network water electrochemical treatment system and method utilizing power plant flue gas - Google Patents
Heat supply network water electrochemical treatment system and method utilizing power plant flue gas Download PDFInfo
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- CN111777198A CN111777198A CN202010754167.2A CN202010754167A CN111777198A CN 111777198 A CN111777198 A CN 111777198A CN 202010754167 A CN202010754167 A CN 202010754167A CN 111777198 A CN111777198 A CN 111777198A
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- electrochemical reaction
- flue gas
- heat supply
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
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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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
Abstract
The invention provides a heat supply network water electrochemical treatment system and a method utilizing power plant flue gas, comprising an electrochemical reaction unit and a flue gas conveying unit, wherein the electrochemical reaction unit is provided with a heat supply network water inlet and a heat supply network backwater outlet; the heat supply network water inlet is connected with a heat supply network water bypass water outlet; the heat supply network water return outlet is connected with a heat supply network water bypass water return port; the electrochemical reaction unit is also provided with an air inlet which is connected with an air outlet of the flue gas conveying unit; the electrochemical reaction unit is provided with an exhaust port, and the exhaust port is connected with a bypass air inlet of a flue of the thermal power plant; the invention reduces the cost and improves the energy utilization rate.
Description
Technical Field
The invention belongs to the field of thermal power plants, and particularly relates to a heat supply network water electrochemical treatment system and method utilizing flue gas of a power plant.
Background
The source of the make-up water of the thermal power plant in northern areas of China is usually higher in hardness, and scales are easily formed on the surfaces of pipelines and heat exchangers at high temperature, so that the normal operation is influenced. The conventional chemical desalting method, membrane method or ion exchange resin method can cause secondary pollution of chemical agents; the high hardness of raw water causes frequent regeneration, consumes a large amount of acid, alkali and water resources, and causes great cost pressure on power plants in northern areas where water is originally deficient. In recent years, with the prominent environmental protection problem and the enhanced environmental protection consciousness, the national requirements for water saving and emission reduction are more and more strict, and a high-efficiency heat supply network water treatment process with low chemical dosage, less pollution discharge and lower cost is urgently needed to be developed so as to meet the requirement of future development.
The electrochemical technology is a novel water treatment process, realizes the removal of scaling substances and microorganisms through the electrochemical reaction of a cathode area and an anode area, and has the advantages of no addition of chemical water treatment agents, no secondary pollution, low investment and operation cost, water saving, energy saving and the like. The electrochemical technology is used for water quality descaling, at present, circulating water only in domestic fields of steel, metallurgy, chemical industry and the like has some application researches, and the application of the electrochemical technology to heat supply network water descaling treatment is not realized.
The basic principle of the electrochemical treatment technology is that high-concentration hydroxide radicals are gathered near a cathode region through electrode reaction, so that hardness ions such as calcium, magnesium and the like in water form precipitates to be removed; meanwhile, substances such as hydroxyl radicals with strong oxidizing property and the like are generated in the anode area, so that the continuous killing effect on microorganisms such as bacteria in water can be generated, and the generation of biological slime is prevented. In order to promote the removal of calcium and magnesium ions in the cathode region, the generation of carbonate needs to be promoted, but the method of adding sodium carbonate and other agents causes additional cost.
Disclosure of Invention
The invention aims to provide a heat supply network water electrochemical treatment system and method utilizing power plant flue gas, which solve the defect of high cost of the conventional supplementary water source of a thermal power plant during water treatment.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a heat supply network water electrochemical treatment system utilizing power plant flue gas, which comprises an electrochemical reaction unit and a flue gas conveying unit, wherein the electrochemical reaction unit is provided with a heat supply network water inlet and a heat supply network backwater outlet; the heat supply network water inlet is connected with a heat supply network water bypass water outlet; the heat supply network water return outlet is connected with a heat supply network water bypass water return port;
the electrochemical reaction unit is also provided with an air inlet which is connected with an air outlet of the flue gas conveying unit;
and the electrochemical reaction unit is provided with an exhaust port, and the exhaust port is connected with a bypass air inlet of a flue of the thermal power plant.
Preferably, the system also comprises a water quality monitoring and controlling unit; the water quality monitoring and controlling unit is respectively connected with the electrochemical reaction unit and the flue gas conveying unit; the device is used for collecting the water quality parameter condition of water in the electrochemical reaction unit and outputting a current, voltage or gas flow regulation instruction to the electrochemical reaction unit and the flue gas conveying unit according to the water quality parameter condition.
Preferably, the water quality monitoring and controlling unit comprises a numerical control system and a water quality probe, wherein the water quality probe is used for acquiring the water quality parameter condition of the water in the electrochemical reaction unit and transmitting the acquired data to the numerical control system; and the numerical control system is used for displaying the received data, outputting current and voltage to the electrochemical reaction unit according to the water quality parameter condition and outputting a gas flow regulation and control instruction to the flue gas conveying unit.
Preferably, the electrochemical reaction unit comprises a power supply, a cathode, an anode, an electrically-controlled scaling device and a shell, wherein the shell is a cylindrical structure with one open end and one closed end; the cathode is of a cylindrical structure and is arranged in the shell and is tightly attached to the inner side wall of the shell; the anode is of a columnar structure and is arranged at the center of the shell; the working part of the electrically-controlled scaling device is in contact with the surface of the cathode.
Preferably, the columnar anode is Ru-Ir composite metal oxide; the cylindrical cathode is carbon steel.
Preferably, the electrically-controlled scale scraping device comprises a variable frequency motor and a scraper, wherein an output shaft of the variable frequency motor is connected with the scraper and is used for driving the scraper to rotate; the working end of the scraper is in contact with the surface of the cathode.
Preferably, the electrochemical reaction unit is further provided with a sewage draining outlet, and the sewage draining outlet is connected with a sludge treatment unit.
Preferably, the sludge treatment unit comprises a sludge delivery pump, a sludge dewatering device and a storage tank, wherein the sewage discharge outlet of the electrochemical reaction unit is connected with the inlet of the sludge dewatering device through the sludge delivery pump; the sludge cake outlet of the sludge dewatering device is connected with the storage pool.
A method for electrochemically treating heat supply network water by utilizing flue gas of a power plant is based on a heat supply network water electrochemical treatment system utilizing flue gas of the power plant and comprises the following steps:
respectively conveying the heat supply network water and the power plant flue gas to an electrochemical reaction unit for electrochemical reaction, wherein carbon dioxide in the flue gas is reacted with OH in a cathode area of the electrochemical reaction unit-Reacting to generate carbonate, combining the carbonate with calcium and magnesium ions to form scaling substances, and depositing the scaling substances on the surface of the cathode so as to remove the calcium and magnesium ions from the water;
the produced water of the electrochemical reaction unit enters a water return port of a heat supply network water bypass;
and the exhaust gas of the electrochemical reaction unit enters a flue bypass air inlet.
Preferably, the water quality parameter of the water in the electrochemical reaction unit is monitored in real time through the water quality monitoring and control unit, and a regulation and control instruction is output to the electrochemical reaction unit and the flue gas conveying unit according to the collected water quality parameter, specifically:
when the LSI index is greater than or equal to 1, the current of the electrochemical reaction unit is increased, and the gas flow rate of the flue gas conveying unit is increased;
when the LSI index is more than 0 and less than 1, the current of the electrochemical reaction unit is unchanged, and the gas flow of the flue gas conveying unit is unchanged;
when the LSI index is 0 or less, the current of the electrochemical reaction unit decreases, and the gas flow rate of the flue gas transport unit decreases.
Compared with the prior art, the invention has the beneficial effects that:
according to the system and the method for electrochemically treating heat supply network water by using the flue gas of the power plant, the traditional chemical agent method, the membrane method or the ion exchange resin method are replaced by the electrochemical treatment, so that the cost of agent purchase is avoided, the requirement of maintenance and regeneration is reduced, and the generation of a large amount of acid-base wastewater and agent wastewater is avoided; simultaneously, carbon dioxide in the high-temperature flue tail gas of the power plant and OH in the cathode region of the electrochemical reaction unit are utilized-Reacting to generate carbonate, combining the carbonate with calcium and magnesium ions to form scaling substances, and depositing the scaling substances on the surface of the cathode so as to remove the calcium and magnesium ions from the water; the invention reduces the cost and improves the energy utilization rate.
Furthermore, the water quality monitoring and control unit can flexibly adjust the treatment depth in real time, so that the removal efficiency of the scaling substances in the water of the heat supply network is improved.
Furthermore, the scaling is discharged out of the system through the electrochemical reaction and the scaling device, so that the risk of scaling of the heat exchanger and the pipeline is greatly reduced.
Drawings
Fig. 1 is a schematic diagram of a system structure related to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the heat supply network water electrochemical treatment system using power plant flue gas provided by the invention comprises an electrochemical reaction unit 1, a water quality monitoring and control unit 2, a flue gas conveying unit 3 and a sludge treatment unit 4, wherein the electrochemical reaction unit 1 is provided with a make-up water inlet and a make-up water outlet which are respectively connected with a water outlet and a water inlet of a water supply main pipe.
The electrochemical reaction unit 1 is also provided with an air inlet which is connected with an air outlet of the flue gas conveying unit 3.
And the electrochemical reaction unit 1 is provided with an exhaust port, and the exhaust port is connected with a bypass air inlet of a flue of the thermal power plant.
The bypass outlet of the flue of the thermal power plant is connected with the inlet of the flue gas conveying unit 3.
And a sewage draining outlet is arranged on the electrochemical reaction unit 1 and is connected with the sludge treatment unit 4.
The water quality monitoring and controlling unit 2 is respectively connected with the electrochemical reaction unit 1 and the flue gas conveying unit 3; is used for collecting water quality parameters and controlling the current, voltage or gas flow regulation and control instructions sent out by the electrochemical reaction unit 1 and the flue gas conveying unit 3 according to the water quality parameters.
Specifically, the method comprises the following steps:
the electrochemical reaction unit 1 comprises a power supply, a cathode, an anode, an electric control scale scraping device and a shell, wherein the shell is of a cylindrical structure with one open end and one closed end; the cathode is of a cylindrical structure and is arranged in the shell and is tightly attached to the inner side wall of the shell; the anode is of a columnar structure and is arranged in the center of the shell.
The electric control scale scraping device comprises a variable frequency motor and a scraper, wherein an output shaft of the variable frequency motor is connected with the scraper and used for driving the scraper to rotate; the working end of the scraper is in contact with the surface of the cathode and is used for scraping the scale on the surface of the cathode.
The water inlet, the water outlet, the air inlet, the air outlet and the sewage outlet which are arranged on the electrochemical reaction unit 1 are all arranged on the shell.
The power supply is a direct current power supply, the current and the voltage are adjustable, and the power supply respectively supplies power to the cathode, the anode and the electric control scale scraping device.
The water quality monitoring and controlling unit 2 comprises a numerical control system and a water quality probe, wherein the water quality probe is used for acquiring water quality parameters (hardness ions and LSI (large scale integration) indexes) in water in the electrochemical reaction unit 1 and transmitting acquired data to the numerical control system; the numerical control system is a data collection, display and processing center, can display the water quality parameters collected by the water quality probe, and sends current and voltage to the electrochemical reaction unit 1 or sends a gas flow regulation and control instruction to the flue gas conveying unit 3 according to the water quality parameter condition.
The flue gas delivery unit 3 comprises a gas duct, wherein the gas inlet of the gas duct is connected to the thermal power plant flue gas outlet; the gas outlet of the gas pipeline is connected with the gas inlet of the electrochemical reaction unit 1; the exhaust port of the electrochemical reaction unit 1 is connected with the bypass air inlet of the flue of the thermal power plant.
Electromagnetic valves are arranged between a connecting pipeline between the air inlet of the gas pipeline and the air outlet of the flue of the thermal power plant, between the air outlet of the gas pipeline and the air inlet of the electrochemical reaction unit 1 and between the exhaust port of the electrochemical reaction unit 1 and the bypass air inlet of the flue of the thermal power plant.
The sludge treatment unit 4 comprises a sludge delivery pump, a sludge dewatering device and a storage pool, wherein the sewage outlet of the electrochemical reaction unit 1 is connected with the inlet of the sludge dewatering device through the sludge delivery pump; the sludge cake outlet of the sludge dewatering device is connected with the storage pool.
In the electrochemical reaction unit 1, the columnar anode is Ru-Ir composite metal oxide; the cylindrical cathode is carbon steel.
A method for electrochemically treating heat supply network water by utilizing flue gas of a power plant is realized by utilizing the system, and the method comprises the following steps:
In the step (1), a bypass water outlet of the heat supply network water is arranged on a heat supply network water supply main pipe; the flue bypass gas outlet is arranged behind the flue denitration, desulfurization and dust removal unit and in front of the chimney;
in the step (1), carbon dioxide in the flue gas reacts with OH in the cathode area of the electrochemical reaction unit-React to generateAnd carbonate radical, wherein the carbonate radical is combined with calcium and magnesium ions to form scaling substances, and the scaling substances are deposited on the surface of the cathode, so that the calcium and magnesium ions are removed from the water.
In the step (2), a water quality probe of the water quality monitoring and control unit 2 is positioned between a water outlet of the electrochemical reaction unit 1 and a bypass water return port of heat supply network water, and hardness ions and LSI (large scale integration) indexes are detected;
in the step (2), the control strategy of the water quality monitoring and controlling unit 2 is as follows:
when the LSI index is 1 or more, the current of the electrochemical reaction unit 1 increases, and the gas flow rate of the flue gas transport unit 3 increases;
when the LSI index is greater than 0 and less than 1, the current of the electrochemical reaction unit 1 is unchanged, and the gas flow rate of the flue gas transport unit 3 is unchanged;
when the LSI index is 0 or less, the current of the electrochemical reaction unit 1 decreases, and the gas flow rate of the flue gas transport unit 3 decreases.
In the step (3), a bypass water return port of the heat supply network water is arranged on the heat supply network water supply main pipe and behind a bypass water outlet; the bypass air inlet of the flue is arranged behind the bypass air outlet of the flue and in front of the chimney;
in the step (4), the obtained sludge is a mixture of calcium carbonate and magnesium hydroxide.
Claims (10)
1. A heat supply network water electrochemical treatment system utilizing power plant flue gas is characterized by comprising an electrochemical reaction unit (1) and a flue gas conveying unit (3), wherein a heat supply network water inlet and a heat supply network water return outlet are formed in the electrochemical reaction unit (1); the heat supply network water inlet is connected with a heat supply network water bypass water outlet; the heat supply network water return outlet is connected with a heat supply network water bypass water return port;
the electrochemical reaction unit (1) is also provided with an air inlet which is connected with an air outlet of the flue gas conveying unit (3);
an exhaust port is arranged on the electrochemical reaction unit (1), and the exhaust port is connected with a bypass air inlet of a flue of the thermal power plant.
2. A power plant flue gas utilizing heat supply network water electrochemical treatment system according to claim 1, further comprising a water quality monitoring and control unit (2); the water quality monitoring and controlling unit (2) is respectively connected with the electrochemical reaction unit (1) and the flue gas conveying unit (3); the device is used for collecting the water quality parameter condition of water in the electrochemical reaction unit (1) and outputting a current, voltage or gas flow regulation instruction to the electrochemical reaction unit (1) and the flue gas conveying unit (3) according to the water quality parameter condition.
3. The system for electrochemically treating heat supply network water by using flue gas of a power plant as claimed in claim 2, wherein the water quality monitoring and control unit (2) comprises a numerical control system and a water quality probe, wherein the water quality probe is used for acquiring water quality parameter conditions of water in the electrochemical reaction unit (1) and transmitting the acquired data to the numerical control system; the numerical control system is used for displaying the received data, outputting current and voltage to the electrochemical reaction unit (1) according to the water quality parameter condition and outputting a gas flow regulation and control instruction to the flue gas conveying unit (3).
4. The system for electrochemically treating heat supply network water by using flue gas of a power plant as recited in claim 1, wherein the electrochemical reaction unit (1) comprises a power supply, a cathode, an anode, an electrically controlled scaling device and a housing, wherein the housing is a cylindrical structure with one open end and one closed end; the cathode is of a cylindrical structure and is arranged in the shell and is tightly attached to the inner side wall of the shell; the anode is of a columnar structure and is arranged at the center of the shell; the working part of the electrically-controlled scaling device is in contact with the surface of the cathode.
5. The system of claim 4, wherein the columnar anode is a Ru-Ir complex metal oxide; the cylindrical cathode is carbon steel.
6. The system for electrochemical treatment of heat supply network water by using flue gas of power plant as claimed in claim 4 or 5, wherein the electrically controlled scaling device comprises a variable frequency motor and a scraper, wherein an output shaft of the variable frequency motor is connected with the scraper for driving the scraper to rotate; the working end of the scraper is in contact with the surface of the cathode.
7. The system for electrochemically treating heat supply network water by using flue gas of a power plant as claimed in claim 1, wherein the electrochemical reaction unit (1) is further provided with a sewage draining outlet, and the sewage draining outlet is connected with a sludge treatment unit (4).
8. The system for electrochemically treating the heat supply network water by using the flue gas of the power plant as recited in claim 7, characterized in that the sludge treatment unit (4) comprises a sludge delivery pump, a sludge dewatering device and a storage tank, wherein a sewage discharge outlet of the electrochemical reaction unit (1) is connected with an inlet of the sludge dewatering device through the sludge delivery pump; the sludge cake outlet of the sludge dewatering device is connected with the storage pool.
9. A method for electrochemically treating heat supply network water using power plant flue gas, characterized in that, a system for electrochemically treating heat supply network water using power plant flue gas based on any one of claims 1 to 8 comprises the following steps:
respectively conveying the heat supply network water and the power plant flue gas to an electrochemical reaction unit (1) for electrochemical reaction, wherein carbon dioxide in the flue gas is reacted with OH in the cathode area of the electrochemical reaction unit (1)-Reacting to generate carbonate, combining the carbonate with calcium and magnesium ions to form scaling substances, and depositing the scaling substances on the surface of the cathode so as to remove the calcium and magnesium ions from the water;
the produced water of the electrochemical reaction unit (1) enters a water return port of a heat supply network water bypass;
the exhaust gas of the electrochemical reaction unit (1) enters a flue bypass air inlet.
10. The method for electrochemically treating heat supply network water by using flue gas of a power plant as claimed in claim 9, wherein the water quality parameter of water in the electrochemical reaction unit (1) is monitored in real time by the water quality monitoring and control unit (2), and a regulation instruction is output to the electrochemical reaction unit (1) and the flue gas delivery unit (3) according to the collected water quality parameter, specifically:
when the LSI index is greater than or equal to 1, the current of the electrochemical reaction unit (1) is increased, and the gas flow rate of the flue gas transport unit (3) is increased;
when the LSI index is more than 0 and less than 1, the current of the electrochemical reaction unit (1) is unchanged, and the gas flow of the flue gas conveying unit (3) is unchanged;
when the LSI index is 0 or less, the current of the electrochemical reaction unit (1) decreases and the gas flow rate of the flue gas transport unit (3) decreases.
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| CN202010754167.2A CN111777198A (en) | 2020-07-30 | 2020-07-30 | Heat supply network water electrochemical treatment system and method utilizing power plant flue gas |
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Cited By (1)
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| CN114853047A (en) * | 2022-04-20 | 2022-08-05 | 天津大学 | Distributed seawater carbon dioxide capture device and use method thereof |
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