CN112875936A - Power plant indirect air cooling unit circulating water comprehensive treatment system - Google Patents
Power plant indirect air cooling unit circulating water comprehensive treatment system Download PDFInfo
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- CN112875936A CN112875936A CN202110316186.1A CN202110316186A CN112875936A CN 112875936 A CN112875936 A CN 112875936A CN 202110316186 A CN202110316186 A CN 202110316186A CN 112875936 A CN112875936 A CN 112875936A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/422—Treatment of water, waste water, or sewage by ion-exchange using anionic exchangers
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a circulating water comprehensive treatment system of an indirect air cooling unit of a power plant.A booster pump outlet is divided into two paths, wherein one path is communicated with an inlet of a precision filter through a filter inlet valve, the other path is communicated with an inlet of a filter bypass valve, and an outlet of the filter bypass valve is communicated with an inlet of a system outlet isolation valve through an anode bed bypass valve and an cathode bed bypass valve in sequence; the outlet of the precision filter is communicated with the inlet of the system outlet isolation valve through a filter outlet valve, a cation bed inlet valve, a cation bed outlet valve, an anion bed inlet valve, an anion bed and an anion bed outlet valve in sequence; the outlet of the filter outlet valve is communicated with the inlet of the cation bed bypass valve, and the outlet of the cation bed outlet valve is communicated with the inlet of the anion bed bypass valve; the ammonia or hydrazine adding device and the carbon dioxide adding device are communicated with the outlet of the anion bed bypass valve, and the system can quickly remove suspended matters and impurities in the circulating water and quickly adjust the pH value of the circulating water.
Description
Technical Field
The invention belongs to the technical field of chemical circulating water treatment of power plants, and relates to a circulating water comprehensive treatment system of an indirect air cooling unit of a power plant.
Background
At present, the indirect air cooling technology of a thermal power plant is an advanced water-saving technology, and more thermal power plants in northern areas adopt the indirect air cooling technology. The heat engine unit cooling technology adopts demineralized water as circulating water to carry out closed circulation, the circulating water firstly cools the exhaust steam from the low-pressure cylinder of the steam turbine in the condenser, then the heated circulating water exchanges heat with cold air in the indirect cooling tower heat exchanger, and the circulating water after heat exchange and temperature reduction enters the condenser to cool the exhaust steam from the low-pressure cylinder of the steam turbine. The circulating water system has the electrochemical state of a ternary corrosion system of carbon steel, stainless steel and 1050A pure aluminum, and the circulating water system adopting the pure aluminum material as the air cooling heat radiator structure material uses high-quality desalted water. The clearance is incomplete in the capital construction period or operation maintenance back system, and circulating water system does not generally design and adds medicine or desalination device, quality of water probably can't be controlled, according to the actual operation experience feedback of indirect air cooling unit of thermal power factory, the quality of water worsens has all appeared in the capital construction stage and operation to many units, the pH is proruption to rise (pH 8.5 aluminum product begins to corrode, pH 9 begins to corrode fast), the conductivity rises, the production accident that 1050A pure aluminum air cooling radiator takes place serious corrosion leakage and leads to the unit to shut down even causes, have led to the huge threat for indirect air cooling unit safe operation. At present, the water quality of circulating water of an indirect cooling unit has no relevant standard, and the water quality control mode of the circulating water of the indirect cooling unit is being explored, and the indirect cooling unit comprises the following steps: the water exchange method is adopted, but the indirect air cooling circulating water system has large water volume, and the method for controlling the quality of the circulating water only by water exchange is not ideal and runs counter to the water-saving design idea; the process effectively reduces the pH value of the circulating water of the unit by adopting a circulating water bypass cation bed treatment process, but has slow effect, can not remove anions and still causes certain corrosion to the system; the filtering and mixed bed process is adopted: the mixed bed can remove salt and fundamentally remove impurity ions, but the adjusting speed is slow, the aluminum corrosion is difficult when the pH value changes suddenly, the mixed bed is complicated to regenerate, and the investment of adding regeneration equipment is large; the chemical adding method is characterized in that a small amount of phosphoric acid or ammonia water is added into circulating water to adjust the pH value, although the pH value can be controlled within a certain range, the salt content in desalted water is increased after a medicine is introduced into a system, and certain corrosion can be caused to the material of the system.
The four methods have more defects, can not remove suspended matters or impurities in the circulating water, have slow effect on treating the circulating water quality of the indirect cooling unit, and can not fundamentally reduce the corrosion of system materials, so a method for comprehensively controlling and rapidly improving the circulating water quality is needed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a circulating water comprehensive treatment system of an indirect air cooling unit of a power plant, which can quickly remove suspended matters and impurities in circulating water.
In order to achieve the purpose, the comprehensive treatment system for the circulating water of the indirect air cooling unit of the power plant comprises a booster pump, a filter inlet valve, a precision filter, a filter bypass valve, a positive bed bypass valve, a negative bed bypass valve, a system outlet isolation valve, a filter outlet valve, a positive bed inlet valve, a positive bed outlet valve, a negative bed inlet valve, a negative bed and a negative bed outlet valve;
the outlet of the booster pump is divided into two paths, wherein one path is communicated with the inlet of the precision filter through a filter inlet valve, the other path is communicated with the inlet of a filter bypass valve, and the outlet of the filter bypass valve is communicated with the inlet of a system outlet isolation valve through a cation bed bypass valve and an anion bed bypass valve in sequence;
the outlet of the precision filter is communicated with the inlet of the system outlet isolation valve through a filter outlet valve, a cation bed inlet valve, a cation bed outlet valve, an anion bed inlet valve, an anion bed and an anion bed outlet valve in sequence;
the outlet of the filter outlet valve is communicated with the inlet of the cation bed bypass valve, and the outlet of the cation bed outlet valve is communicated with the inlet of the anion bed bypass valve;
the ammonia or hydrazine adding device and the carbon dioxide adding device are communicated with the outlet of the bypass valve of the anion bed.
The inlet of the booster pump is provided with a system inlet isolation valve.
The device also comprises a carbon dioxide device sampling valve, wherein the inlet of the carbon dioxide device sampling valve is communicated with a sampling port on the pipeline between the anion-bed bypass valve and the system outlet isolation valve, the outlet of the carbon dioxide device sampling valve is communicated with the inlet of the carbon dioxide adding device, and the outlet of the carbon dioxide adding device is communicated with a carbon dioxide dosing port on the pipeline between the anion-bed bypass valve and the system outlet isolation valve.
And a system water inlet sampling online meter for detecting the pH value and the conductivity is arranged at the outlet of the booster pump and is connected with an external DCS (distributed control system).
The outlet of the cation bed is provided with a first cation bed effluent sampling on-line meter for detecting the pH value and the conductivity, and the cation bed effluent sampling on-line meter is connected with an external DCS system.
An outlet of the anion bed is provided with an anion bed effluent sampling on-line meter for detecting pH value, conductivity and silicon concentration, and the anion bed effluent sampling on-line meter is connected with an external DCS system.
An outlet main pipe sampling online meter for detecting the pH value and the conductivity is arranged at the inlet of the system outlet isolation valve and connected with an external DCS system.
The outlet of the carbon dioxide adding device is communicated with the carbon dioxide adding opening through a carbon dioxide adding valve.
The system is characterized by further comprising an ammonia or hydrazine adding medicine valve and an ammonia or hydrazine device sampling valve, wherein an ammonia adding port and an ammonia sampling port are arranged on a pipeline between the cathode bed outlet valve and the system outlet isolating valve, the ammonia sampling port is communicated with an inlet of the ammonia or hydrazine device through the ammonia or hydrazine device sampling valve, and an outlet of the ammonia or hydrazine device is communicated with the ammonia adding port through the ammonia or hydrazine adding medicine valve.
The invention has the following beneficial effects:
when the comprehensive treatment system for the circulating water of the indirect air cooling unit of the power plant is specifically operated, a precision filter is adopted to filter suspended matters, particles and corrosion products in the circulating water, so that sundries left in the system during the capital construction period or the maintenance period are thoroughly removed, and the comprehensive treatment system is flexible to operate and wide in applicability; by adopting the cation bed and anion bed processes, salts in water are thoroughly removed, the conductivity is reduced, no new medicament or ions are introduced, and the corrosion problem of the system is fundamentally solved; the investment and the operation cost can be greatly reduced, the resin with the same type of the fine processing system is adopted, the failed resin is conveyed to the fine processing regeneration system for regeneration, a set of regeneration system does not need to be designed, and the resin can be recycled.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, K0 is a system inlet isolation valve, K1 is a filter inlet valve, K2 is a filter bypass valve, K3 is a filter outlet valve, K4 is an anode bed inlet valve, K5 is an anode bed outlet valve, K6 is an anode bed bypass valve, K7 is an cathode bed bypass valve, K8 is an cathode bed inlet valve, K9 is an cathode bed outlet valve, K10 is a carbon dioxide dosing valve, K11 is a carbon dioxide device sampling valve, K12 is an ammonia or hydrazine dosing valve, K13 is an ammonia or hydrazine device sampling valve, K14 is a system outlet isolation valve, Y1 is a system inlet water sampling online meter, Y2 is an anode bed outlet water sampling online meter, Y3 is an anode outlet water sampling online meter, and Y4 is an outlet main pipe sampling online meter.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the comprehensive treatment system for circulating water of the indirect air cooling unit in the power plant comprises a booster pump, a filter inlet valve K1, a precision filter, a filter bypass valve K2, a positive bed bypass valve K6, a negative bed bypass valve K7, a system outlet isolation valve K14, a filter outlet valve K3, a positive bed inlet valve K4, a positive bed outlet valve K5, a negative bed inlet valve K8, and a negative bed and negative bed outlet valve K9; the outlet of the booster pump is divided into two paths, wherein one path is communicated with the inlet of the precision filter through a filter inlet valve K1, the other path is communicated with the inlet of a filter bypass valve K2, and the outlet of the filter bypass valve K2 is communicated with the inlet of a system outlet isolation valve K14 through an anode bed bypass valve K6 and an cathode bed bypass valve K7 in sequence; the outlet of the precision filter is communicated with the inlet of a system outlet isolation valve K14 through a filter outlet valve K3, a cation bed inlet valve K4, a cation bed, an cation bed outlet valve K5, a anion bed inlet valve K8, an anion bed and anion bed outlet valve K9 in sequence; the outlet of the filter outlet valve K3 is communicated with the inlet of the cation bed bypass valve K6, and the outlet of the cation bed outlet valve K5 is communicated with the inlet of the anion bed bypass valve K7; the ammonia or hydrazine adding device and the carbon dioxide adding device are communicated with the outlet of the anion bed bypass valve K7.
The inlet of the booster pump is provided with a system inlet isolation valve K0.
The invention also comprises a carbon dioxide device sampling valve K11, wherein the inlet of the carbon dioxide device sampling valve K11 is communicated with the sampling port on the pipeline between the anion bed bypass valve K7 and the system outlet isolation valve K14, the outlet of the carbon dioxide device sampling valve K11 is communicated with the inlet of the carbon dioxide adding device, and the outlet of the carbon dioxide adding device is communicated with the carbon dioxide adding port on the pipeline between the anion bed bypass valve K7 and the system outlet isolation valve K14.
And a system water inlet sampling online meter Y1 for detecting the pH value and the conductivity is arranged at the outlet of the booster pump, and the system water inlet sampling online meter Y1 is connected with an external DCS system.
The outlet of the cation bed is provided with a first cation bed effluent sampling online table Y2 for detecting the pH value and the conductivity, and the cation bed effluent sampling online table Y2 is connected with an external DCS system.
An outlet of the anion bed is provided with an anion bed effluent sampling online table Y3 for detecting pH value, conductivity and silicon concentration, and the anion bed effluent sampling online table Y3 is connected with an external DCS system.
An inlet of the system outlet isolation valve K14 is provided with a water outlet main pipe sampling online meter Y4 for detecting pH value and conductivity, and the water outlet main pipe sampling online meter Y4 is connected with an external DCS system.
The outlet of the carbon dioxide adding device is communicated with the carbon dioxide adding opening through a carbon dioxide adding valve K10.
The device also comprises an ammonia or hydrazine adding medicine adding valve K12 and an ammonia or hydrazine device sampling valve K13, wherein an ammonia adding port and an ammonia sampling port are arranged on a pipeline between the cathode bed outlet valve K9 and the system outlet isolation valve K14, the ammonia sampling port is communicated with the inlet of the ammonia or hydrazine device through the ammonia or hydrazine device sampling valve K13, and the outlet of the ammonia or hydrazine device is communicated with the ammonia adding port through the ammonia or hydrazine adding medicine adding valve K12.
A bypass is led out from an outlet pipe of the circulating water pump, circulating water is boosted through a booster pump, and a filter inlet valve K1 and a filter outlet valve K3 are opened for filtration by a precision filter; when the filter is overhauled or the water quality is better and the suspended matters are few, the filter bypass valve K2 can be opened, and the filter inlet valve K1 and the filter outlet valve K3 are closed; when the pH detected by the online meter Y1 is more than 8.5, opening a filter inlet valve K1, a filter outlet valve K3, a positive bed inlet valve K4, a positive bed outlet valve K5 and a negative bed bypass valve K7, and putting the precision filter and the positive bed into operation and directly returning the precision filter and the positive bed to the circulating water system through a negative bed bypass; when the pH value detected by an online meter Y1 in the system water inlet sampling is more than 8.5, and the effect of putting the precision filter and the cation bed into operation and directly returning the precision filter and the cation bed into the circulating water system through the anion bed bypass is not obvious, putting the precision filter and the cation bed into operation together with adding carbon dioxide; when the pH value detected by a system water inlet sampling online table Y1 is less than 7, opening a filter inlet valve K1, a filter outlet valve K3, a cation bed bypass valve K6, an anion bed inlet valve K8 and an anion bed outlet valve K9, and putting into operation the precision filter, the cation bed bypass and the anion bed; when the pH value detected by a system water inlet sampling on-line table Y1 is less than 7 and the effects of the precision filter, the anode bed bypass and the cathode bed are not obvious, the precision filter, the anode bed bypass and the cathode bed bypass are put into operation together with an ammonia adding or hydrazine device; when the pH value detected by a system water inlet sampling on-line table Y1 is more than 7 and less than 8.3, when the conductivity exceeds the standard, the pre-precision filter, the positive bed and the negative bed can be put into operation, and the filter inlet valve K1, the filter outlet valve K3, the positive bed inlet valve K4, the positive bed outlet valve K5, the negative bed inlet valve K8 and the negative bed outlet valve K9 are opened. When the water quality is better, the precision filter can be put into operation singly or the system can not be put into operation.
The whole system adopts DCS/PLC to realize automatic operation control and realizes the starting and stopping functions of the precision filter, the positive bed and the negative bed. When the conductivity detected by a first cation bed effluent sampling online table Y2 is more than 0.4 mu S/cm or the inlet-outlet differential pressure is more than 0.1MPa, the cation bed fails and cation resin is required to be exported and regenerated; when the conductivity of the effluent of the anion bed is more than 0.2 mu S/cm or the pressure difference between an inlet and an outlet is more than 0.1MPa, the anion bed fails and anion resin is required to be exported and regenerated. Resin delivery is carried out in two ways: 1. the regeneration is carried by a movable resin loading and unloading trolley, the resin is sent to a fine treatment regeneration system for regeneration, and the resin is sent back to the anode bed and the cathode bed by the movable resin loading and unloading trolley after the regeneration is finished, so that the resin is recycled. 2. And conveying the failed resin to a fine treatment regeneration system for regeneration by using a formal resin conveying pipeline, and returning the resin back through the resin conveying pipeline after regeneration is finished.
Claims (9)
1. The circulating water comprehensive treatment system of the indirect air cooling unit in the power plant is characterized by comprising a booster pump, a filter inlet valve (K1), a precision filter, a filter bypass valve (K2), a cation bed bypass valve (K6), an anion bed bypass valve (K7), a system outlet isolation valve (K14), a filter outlet valve (K3), a cation bed inlet valve (K4), an cation bed outlet valve (K5), an anion bed inlet valve (K8) and an anion bed and anion bed outlet valve (K9);
the outlet of the booster pump is divided into two paths, wherein one path is communicated with the inlet of the precision filter through a filter inlet valve (K1), the other path is communicated with the inlet of a filter bypass valve (K2), and the outlet of the filter bypass valve (K2) is communicated with the inlet of a system outlet isolation valve (K14) through an anode bed bypass valve (K6) and a cathode bed bypass valve (K7) in sequence;
the outlet of the precision filter is communicated with the inlet of a system outlet isolation valve (K14) through a filter outlet valve (K3), a cation bed inlet valve (K4), a cation bed outlet valve (K5), an anion bed inlet valve (K8) and an anion bed and anion bed outlet valve (K9) in sequence;
the outlet of the filter outlet valve (K3) is communicated with the inlet of a cation bed bypass valve (K6), and the outlet of the cation bed outlet valve (K5) is communicated with the inlet of an anion bed bypass valve (K7);
the ammonia or hydrazine adding device and the carbon dioxide adding device are communicated with the outlet of a shadow bed bypass valve (K7).
2. The comprehensive treatment system for circulating water of an indirect air cooling unit in a power plant as claimed in claim 1, wherein a system inlet isolation valve (K0) is arranged at the inlet of the booster pump.
3. The comprehensive treatment system for circulating water of the indirect air cooling unit of the power plant as claimed in claim 1, further comprising a carbon dioxide device sampling valve (K11), wherein the inlet of the carbon dioxide device sampling valve (K11) and a sampling port on the pipeline between the anion bed bypass valve (K7) and the system outlet isolation valve (K14) are communicated, the outlet of the carbon dioxide device sampling valve (K11) is communicated with the inlet of the carbon dioxide adding device, and the outlet of the carbon dioxide adding device is communicated with a carbon dioxide adding port on the pipeline between the anion bed bypass valve (K7) and the system outlet isolation valve (K14).
4. The comprehensive treatment system for circulating water of an indirect air cooling unit of a power plant according to claim 1, wherein a system inlet water sampling online meter (Y1) for detecting pH value and conductivity is arranged at the outlet of the booster pump, and the system inlet water sampling online meter (Y1) is connected with an external DCS system.
5. The comprehensive treatment system for circulating water of the indirect air cooling unit of the power plant as claimed in claim 1, wherein a first cation bed effluent sampling online meter (Y2) for detecting pH value and conductivity is arranged at the outlet of the cation bed, and the cation bed effluent sampling online meter (Y2) is connected with an external DCS system.
6. The comprehensive treatment system for circulating water of the indirect air cooling unit of the power plant according to claim 1, wherein an outlet of the anion bed is provided with an anion bed effluent sampling online meter (Y3) for detecting pH value, conductivity and silicon concentration, and the anion bed effluent sampling online meter (Y3) is connected with an external DCS system.
7. The comprehensive treatment system for circulating water of the indirect air cooling unit of the power plant according to claim 1, wherein a sampling online meter (Y4) of a water outlet main pipe for detecting pH value and conductivity is arranged at an inlet of the system outlet isolation valve (K14), and the sampling online meter (Y4) of the water outlet main pipe is connected with an external DCS system.
8. The comprehensive treatment system for circulating water of the indirect air cooling unit of the power plant as claimed in claim 1, wherein an outlet of the carbon dioxide adding device is communicated with a carbon dioxide adding port through a carbon dioxide adding valve (K10).
9. The comprehensive treatment system for the circulating water of the indirect air cooling unit of the power plant as claimed in claim 1, further comprising an ammonia or hydrazine adding dosing valve (K12) and an ammonia or hydrazine device sampling valve (K13), wherein an ammonia adding port and an ammonia sampling port are arranged on a pipeline between the cathode bed outlet valve (K9) and the system outlet isolation valve (K14), the ammonia sampling port is communicated with an inlet of the ammonia or hydrazine device through the ammonia or hydrazine device sampling valve (K13), and an outlet of the ammonia or hydrazine device is communicated with the ammonia adding port through the ammonia or hydrazine adding dosing valve (K12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110316186.1A CN112875936A (en) | 2021-03-24 | 2021-03-24 | Power plant indirect air cooling unit circulating water comprehensive treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110316186.1A CN112875936A (en) | 2021-03-24 | 2021-03-24 | Power plant indirect air cooling unit circulating water comprehensive treatment system |
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| CN112875936A true CN112875936A (en) | 2021-06-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022268461A1 (en) * | 2021-06-22 | 2022-12-29 | Gambro Lundia Ab | Acidic and alkaline cleaning of ion exchange systems, such as water purifiers, by ion exchange resin |
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2021
- 2021-03-24 CN CN202110316186.1A patent/CN112875936A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022268461A1 (en) * | 2021-06-22 | 2022-12-29 | Gambro Lundia Ab | Acidic and alkaline cleaning of ion exchange systems, such as water purifiers, by ion exchange resin |
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Application publication date: 20210601 |