CN111747561A - Automatic control system for water quality of high-level water collecting cooling tower of thermal power plant - Google Patents
Automatic control system for water quality of high-level water collecting cooling tower of thermal power plant Download PDFInfo
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- CN111747561A CN111747561A CN202010522591.4A CN202010522591A CN111747561A CN 111747561 A CN111747561 A CN 111747561A CN 202010522591 A CN202010522591 A CN 202010522591A CN 111747561 A CN111747561 A CN 111747561A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 291
- 238000001816 cooling Methods 0.000 title claims abstract description 47
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 30
- 239000002455 scale inhibitor Substances 0.000 claims abstract description 30
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 30
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011575 calcium Substances 0.000 claims abstract description 26
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 26
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000003814 drug Substances 0.000 claims abstract description 20
- 230000001502 supplementing effect Effects 0.000 claims abstract description 13
- 238000003908 quality control method Methods 0.000 claims abstract description 12
- 239000010865 sewage Substances 0.000 claims description 36
- 230000001105 regulatory effect Effects 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 19
- 230000003020 moisturizing effect Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 230000033116 oxidation-reduction process Effects 0.000 claims description 10
- 235000011149 sulphuric acid Nutrition 0.000 claims description 7
- 239000001117 sulphuric acid Substances 0.000 claims description 7
- 230000020477 pH reduction Effects 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 230000000844 anti-bacterial effect Effects 0.000 claims description 4
- 239000003899 bactericide agent Substances 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 7
- 239000013589 supplement Substances 0.000 abstract description 4
- 229940079593 drug Drugs 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 2
- 239000002253 acid Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
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- 230000000737 periodic effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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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
- C02F2209/04—Oxidation reduction potential [ORP]
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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
- C02F2209/05—Conductivity or salinity
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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
- C02F2209/05—Conductivity or salinity
- C02F2209/055—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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/42—Liquid level
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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
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses an automatic water quality control system for a high-level water collecting cooling tower of a thermal power plant, which comprises the high-level water collecting cooling tower, a circulating water forebay, a water supplementing pool, a water supplementing pump, a circulating water pump, a sulfuric acid storage tank, a scale inhibitor dissolving tank, a sodium hypochlorite storage tank and a condenser. Aiming at the design characteristics of the high-level water-collecting cooling tower, the system optimally designs and configures subsystems for water replenishing, pollution discharging, medicine adding and the like of the circulating water, can realize automatic water replenishing and discharging and automatic medicine adding, can effectively save medicines and water, and greatly reduces the fluctuation range of the water quality of the circulating water. The pH value and the calcium hardness (conductivity) are used as circulating water online supervision and control indexes, so that the interference caused by the water quality change of water supplement is eliminated, and the problem of water quality control of the high-level water receiving cooling tower is well solved.
Description
Technical Field
The invention relates to the technical field of circulating water treatment, in particular to an automatic control system for the water quality of a high-level water-collecting cooling tower of a thermal power plant.
Background
The high-order water cooling tower that receives is a novel natural draft cooling tower who saves energy, falls and makes an uproar that appears in recent years, and this technique can reduce circulating water pump's dead lift effectively to practice thrift power consumptively and fall and make an uproar, be the key development direction of present super large-scale cooling tower technique of thermal power factory. The main characteristics are that the concrete water collecting tank and rain area at the bottom of the conventional cooling tower are cancelled, the circulating water pump is arranged at high position, and the cooling tower is internally provided with a high-position water collecting device and a water collecting tank. The water collecting tank of the high-level water collecting tower belongs to a narrow deep water pool with small water surface and deep water depth, and cooled circulating water is collected to the high-level water collecting tank through a water collecting inclined plate and the water collecting tank at the bottom of the water spraying filler and then is conveyed to a circulating water pump room. Because the high-order water cooling tower that receives does not have lower part pond, and the water surface area is less between sump and the room of following the pump intaking, consequently whole circulating water system water capacity is very reduced than conventional tower. The water volume of the circulating water system is small, the retention time of water is short, the concentration is fast, and the water quality fluctuation is large, so that higher requirements on the quality control of the circulating water are provided.
At present, the quality control of the circulating water of the domestic high-level water-collecting cooling tower still depends on manual periodic sampling and chemical examination analysis, the discharge capacity and the dosage are adjusted according to parameters such as the concentration rate of the circulating water, and the water replenishing of the system is performed manually according to the liquid level of the cooling tower. The method obviously cannot control the quality of the circulating water in real time, and the hysteresis of the high-level water-collecting cooling tower is more serious. Not only has condenser corruption and scale deposit risk, extensive benefit drainage control and the mode of adding medicine can cause the waste of a large amount of medicines and water resource moreover. In addition, under the condition that the water quality of the supplemented water changes greatly, the water quality of the circulating water cannot be faithfully reflected by only referring to the concentration ratio, and the phenomenon that the concentration ratio is qualified but the condenser scales can be caused in the past due to deviation from the actual condition.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an automatic control system for the water quality of a high-level water-collecting cooling tower of a thermal power plant, which can realize automatic water supply, drainage and automatic dosing, can effectively save medicines and water and stabilize the water quality of circulating water within a certain range. Meanwhile, the pH value and the calcium hardness (conductivity) are used as circulating water supervision and control indexes, so that the interference caused by the change of the water quality of the water replenishing is eliminated, and the problem of water quality control of the high-level water receiving cooling tower is well solved.
The technical scheme adopted by the invention for solving the problems is as follows: a water quality automatic control system of a high-level water receiving cooling tower of a thermal power plant is characterized by comprising a high-level water receiving cooling tower, a circulating water forebay, a water supplementing pool, a water supplementing pump, a circulating water pump, a sulfuric acid storage tank, a scale inhibitor dissolving tank, a sodium hypochlorite storage tank and a condenser; the high-order water cooling tower of receiving communicates through circulating water channel and circulating water forebay, the circulating water forebay is respectively through adding sulphuric acid pipeline, antisludging agent medicine adding pipeline, sodium hypochlorite medicine adding pipeline and sulphuric acid storage tank, antisludging agent dissolving medicine case, sodium hypochlorite storage tank intercommunication, the moisturizing pond passes through moisturizing pipeline and circulating water forebay intercommunication, install the moisturizing pump on the moisturizing pipeline, the delivery port of circulating water forebay is divided into two routes through circulating water pump, and one route is crossed the circulating water main pipe and is communicated with the water inlet of condenser, and another route passes through user's intercommunication such as process water pipeline and desulfurization, fuel deashing, the condenser passes through the circulating water main pipe and communicates with the water inlet of high-order water cooling tower of receiving, the high-order water cooling tower of receiving is connected with the circulating water sewage pipes.
Further, the circulating water forebay is provided with the level gauge, be provided with on the sulphuric acid pipeline with the sour governing valve, the antisludging agent adds the antisludging agent measuring pump that is provided with frequency conversion regulation on the medicine pipeline, be provided with the sodium hypochlorite measuring pump on the sodium hypochlorite medicine pipeline, be provided with moisturizing governing valve and moisturizing flowmeter on the moisturizing pipeline, be provided with pH table, oxidation reduction potential ORP table, conductivity table and calcium hardness analysis appearance on the circulating water inlet pipe, be provided with blowdown water governing valve and blowdown water flowmeter on the circulating water sewage pipeline, be provided with the technology water flowmeter on the technology water pipeline.
Further, the signal output end of the conductivity meter and the calcium hardness analyzer is connected with the input end of a first controller, and the output end of the first controller is connected with the control end of a sewage discharge regulating valve; the signal output end of the liquid level meter is connected with the input end of a second controller, and the output end of the second controller is connected with the control end of a water replenishing regulating valve; the signal output end of the pH meter is connected with the input end of a third controller, and the output end of the third controller is connected with the control end of the acidification adjusting valve; the signal output ends of the sewage flow meter and the process water flow meter are connected with the input end of a fourth controller, and the output end of the fourth controller is connected with the control end of the scale inhibitor metering pump; and the signal output end of the oxidation-reduction potential ORP meter is connected with the input end of a fifth controller, and the output end of the fifth controller is connected with the control end of the sodium hypochlorite metering pump.
Furthermore, the water replenishing regulating valve and the liquid level meter are controlled in an interlocking mode, the opening degree of the water replenishing regulating valve is increased when the liquid level of the circulating water forebay is lower than a set value, and the opening degree of the water replenishing regulating valve is reduced when the liquid level of the circulating water forebay is higher than the set value.
Furthermore, the sewage control valve is in interlocking control with the conductivity meter and the calcium hardness analyzer, the opening degree of the sewage control valve is increased when the conductivity or the calcium hardness of the circulating water is higher than a set value of the conductivity or the calcium hardness of the circulating water, and the opening degree of the sewage control valve is reduced when the conductivity or the calcium hardness of the circulating water is lower than the set value of the conductivity or the calcium hardness of the circulating water, so that the automatic control of the quality of the circulating water.
Furthermore, the acid adding regulating valve and the pH meter are controlled in an interlocking manner, the opening degree of the acid adding regulating valve is increased when the pH value of the circulating water is higher than a set value, and the opening degree of the acid adding regulating valve is reduced when the pH value of the circulating water is lower than the set value, so that the pH value of the circulating water is automatically controlled.
Furthermore, the scale inhibitor metering pump is controlled with the sewage discharge flow meter and the process water flow meter in an interlocking manner, and the dosage of the scale inhibitor is controlledG=k×（Q p +Q g ）×gWhereinQ p The flow rate of the sewage is the same as that of the sewage,Q g is the flow rate of the process water,gin order to achieve the desired concentration of scale inhibitor in the circulating water,kas correction factors (obtained by field experiments); and carrying out variable frequency adjustment on the scale inhibitor metering pump according to the calculated real-time scale inhibitor adding amount to realize automatic control of the concentration of the scale inhibitor in the circulating water.
Furthermore, the sodium hypochlorite metering pump and the oxidation-reduction potential ORP meter are in interlocking control, the sodium hypochlorite metering pump is started when the ORP value of the circulating water is lower than a set value, and the sodium hypochlorite metering pump is stopped when the ORP value of the circulating water is higher than the set value, so that the concentration of the oxidation type bactericide in the circulating water is automatically controlled.
Compared with the prior art, the invention has the following advantages and effects:
1) through continuous automatic water supply and sewage discharge, the water quality and water level fluctuation caused by intermittent water supply and sewage discharge of circulating water can be greatly reduced, and the water-saving effect is remarkable. Meanwhile, the water replenishing quantity, the sewage discharge quantity and the process water consumption can be monitored and counted on line, and the fine water management of a circulating water system is facilitated.
2) The automatic continuous online monitoring of key water quality parameters such as pH, calcium hardness, conductivity and ORP of the circulating water is realized, the dosage can be automatically adjusted in real time, the concentration of the medicament and the quality of the circulating water are ensured to be stabilized in a safe and reliable range, and the corrosion and scaling risks of a circulating water system of a high-level water collecting cooling tower are greatly reduced.
3) The pH value and the calcium hardness (conductivity) are used as main online monitoring and controlling indexes of the water quality of the circulating water, the concentration ratio is only used as a reference index, the interference caused by the water quality change of the water supplement is eliminated, and the problem of water quality control of the high-level water collecting cooling tower is well solved.
Drawings
Fig. 1 is a schematic structural diagram of an automatic water quality control system of a high-level water collecting cooling tower of a thermal power plant.
Fig. 2 is a schematic diagram of a high-level water-collecting cooling tower of a certain existing thermal power plant.
Fig. 3 is a graph of the change of the conductivity of the circulating water, unit: μ s/cm.
FIG. 4 is a graph of circulating water hardness and alkalinity changes in units: mmol/L.
In the figure: the system comprises a high-level water receiving cooling tower 1, a circulating water forebay 2, a water supplementing pool 3, a water supplementing pump 4, a circulating water pump 5, a sulfuric acid storage tank 6, a scale inhibitor dissolving tank 7, a sodium hypochlorite storage tank 8, a condenser 9, a liquid level meter 10, an acid adding regulating valve 11, a scale inhibitor metering pump 12, a sodium hypochlorite metering pump 13, a water supplementing regulating valve 14, a water supplementing flowmeter 15, a pH meter 16, an oxidation-reduction potential ORP meter 17, a conductivity meter 18, a calcium hardness analyzer 19, a sewage regulating valve 20, a sewage flowmeter 21, a process water flowmeter 22, a first controller 23, a second controller 24, a third controller 25, a fourth controller 26 and a fifth controller 27.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1, in this embodiment, an automatic water quality control system for a high-level water-receiving cooling tower of a thermal power plant includes a high-level water-receiving cooling tower 1, a circulating water forebay 2, a water-replenishing pool 3, a water-replenishing pump 4, a circulating water pump 5, a sulfuric acid storage tank 6, a scale inhibitor dissolving tank 7, a sodium hypochlorite storage tank 8 and a condenser 9; the high-order water cooling tower 1 of receiving communicates through circulation water channel and circulation water forebay 2, circulation water forebay 2 is respectively through adding the sulphuric acid pipeline, antisludging agent adds the medicine pipeline, sodium hypochlorite adds medicine pipeline and sulphuric acid storage tank 6, antisludging agent dissolves medicine case 7, sodium hypochlorite storage tank 8 intercommunication, moisturizing pond 3 passes through moisturizing pipeline and circulation water forebay 2 intercommunication, install moisturizing pump 4 on the moisturizing pipeline, the delivery port of circulation water forebay 2 is divided into two tunnel through circulation water pump 5, one road passes through the water inlet intercommunication of circulation water inlet header and condenser 9, another road passes through process water pipeline and desulfurization, user's intercommunication such as fuel deashing, condenser 9 passes through the water inlet intercommunication of circulation water header and high-order water cooling tower 1, high-order water cooling tower 1 of receiving is connected with the circulating water sewage pipes.
In this embodiment, the circulating water forebay 2 is provided with the level gauge 10, be provided with on the sulphuric acid pipeline and add the sour governing valve 11, be provided with variable frequency control's antisludging agent measuring pump 12 on the antisludging agent adds the medicine pipeline, be provided with sodium hypochlorite measuring pump 13 on the sodium hypochlorite adds the medicine pipeline, be provided with moisturizing governing valve 14 and moisturizing flowmeter 15 on the moisturizing pipeline, be provided with pH meter 16 on the circulating water inlet pipe, oxidation reduction potential ORP table 17, electric conductivity table 18, and calcium hardness analysis appearance 19, be provided with blowdown water governing valve 20 and blowdown water flowmeter 21 on the circulating water blowdown pipeline, be provided with technology water flowmeter 22 on the technology water pipeline.
In this embodiment, the signal output ends of the conductivity meter 18 and the calcium hardness analyzer 19 are connected with the input end of the first controller 23, and the output end of the first controller 23 is connected with the control end of the sewage control valve 20; the signal output end of the liquid level meter 10 is connected with the input end of a second controller 24, and the output end of the second controller 24 is connected with the control end of the water supplementing regulating valve 14; the signal output end of the pH meter 16 is connected with the input end of a third controller 25, and the output end of the third controller 25 is connected with the control end of the acid-adding regulating valve 11; the signal output ends of the sewage water flow meter 21 and the process water flow meter 22 are connected with the input end of a fourth controller 26, and the output end of the fourth controller 26 is connected with the control end of the scale inhibitor metering pump 12; the signal output end of the oxidation-reduction potential ORP meter 17 is connected with the input end of a fifth controller 27, and the output end of the fifth controller 27 is connected with the control end of the sodium hypochlorite metering pump 13.
The working process is as follows:
a) the water replenishing regulating valve 14 is controlled by interlocking with the liquid level meter 10, the opening degree of the water replenishing regulating valve 14 is increased when the liquid level of the circulating water forebay 2 is lower than a set value, and the opening degree of the water replenishing regulating valve 14 is reduced when the liquid level of the circulating water forebay 2 is higher than the set value;
b) the sewage control valve 20 is controlled by interlocking with the conductivity meter 18 and the calcium hardness analyzer 19, when the conductivity or the calcium hardness of the circulating water is higher than a set value, the opening degree of the sewage control valve 20 is increased, and when the conductivity or the calcium hardness of the circulating water is lower than the set value, the opening degree of the sewage control valve 20 is reduced, so that the automatic control of the quality of the circulating water is realized;
c) the acid adding regulating valve 11 and the pH meter 16 are controlled in an interlocking manner, when the pH value of the circulating water is higher than a set value, the opening degree of the acid adding regulating valve 11 is increased, and when the pH value of the circulating water is lower than the set value, the opening degree of the acid adding regulating valve 11 is reduced, so that the pH value of the circulating water is automatically controlled;
d) the scale inhibitor metering pump 12 is controlled by interlocking with the sewage water flow meter 21 and the process water flow meter 22, and the dosage of the scale inhibitor is controlledG=k ×（Q p +Q g ）×gWhereinQ p The flow rate of the sewage is the same as that of the sewage,Q g is the flow rate of the process water,gfor circulating waterThe concentration of the scale inhibitor required in the process,kas correction factors (obtained by field experiments); carrying out variable frequency regulation on the scale inhibitor metering pump 12 according to the calculated real-time scale inhibitor adding amount to realize automatic control of the concentration of the scale inhibitor in the circulating water;
e) the sodium hypochlorite metering pump 13 and the oxidation-reduction potential ORP meter 17 are in interlocking control, the sodium hypochlorite metering pump 13 is started when the ORP value of the circulating water is lower than a set value, and the sodium hypochlorite metering pump 13 is stopped when the ORP value of the circulating water is higher than the set value, so that the concentration of the oxidation type bactericide in the circulating water is automatically controlled.
The automatic control system for the water quality of the high-level water-collecting cooling tower can realize continuous automatic water supply and sewage discharge, and can monitor and count the water supply amount, the sewage discharge amount and the process water amount on line. The automatic continuous on-line monitoring of key water quality parameters such as circulating water pH, calcium hardness, conductivity, ORP and the like is realized, and the dosage can be automatically adjusted in real time. The pH value and the calcium hardness (conductivity) are used as main online monitoring and controlling indexes of the water quality of the circulating water, the concentration ratio is only used as a reference index, the interference caused by the water quality change of the water supplement is eliminated, and the problem of water quality control of the high-level water collecting cooling tower is well solved.
Examples are given.
A2 x 1000MW unit is built in the second stage project of a large thermal power plant in Jiangsu, a scheme of a high-level water-collecting cooling tower is adopted, and the schematic diagram of the cooling tower system is shown in figure 2. The water source is Yangtze river water, and the Yangtze river water is pretreated by raw water, coagulated and precipitated and then enters a water supplementing pool to be used as water supplement of a cooling tower. The water replenishing of the circulating water is manually adjusted, and an operator adjusts a water replenishing door (switch type) according to the water level of the water inlet front pool. The circulating water pollution discharge door adopts a manual adjusting door and is adjusted according to the condition of the quality of the circulating water which is artificially and periodically tested. The scale inhibitor and the bactericide are added by a manual adjustment mode, so that the waste of adding the medicine is large. The change of the water quality of the circulating water from 10 months to 12 months in 2019 is shown in the figure 3 and the figure 4. As can be seen from FIGS. 3 and 4, the conductivity of the circulating water fluctuates between 600 and 1600 μ s/cm, and the alkalinity and the hardness fluctuate between 4-9mmol/L and 2-8mmol/L, respectively. The water quality of the circulating water is large in change range and poor in stability, and the water quality of the high-level water-receiving cooling tower cannot be controlled to be an ideal level only by means of manual adjustment.
After the invention is modified, the water level of the circulating water forebay can be maintained at 12.6m +/-0.6 m, the pH value of the circulating water is between 8.5 and 8.8, the conductivity of the circulating water is between 1300 plus and minus 1450 mu s/cm, and the concentration multiplying power of the circulating water is 5.5 +/-0.3. The automatic water quality control system of the high-level water-collecting cooling tower can effectively buffer water quality fluctuation caused by improper sewage discharge and dosing, the technical scheme achieves the expected aim of stabilizing the concentration ratio of circulating water to 5-6 times of operation, and simultaneously, the unit generating capacity water intake is reduced to 1.68m3The similar units below the MW & h have the advanced level and obvious environmental and economic benefits.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (3)
1. An automatic water quality control system for a high-level water receiving cooling tower of a thermal power plant is characterized by comprising a high-level water receiving cooling tower (1), a circulating water forebay (2), a water supplementing pool (3), a water supplementing pump (4), a circulating water pump (5), a sulfuric acid storage tank (6), a scale inhibitor dissolving box (7), a sodium hypochlorite storage tank (8) and a condenser (9); the high-level water-collecting cooling tower (1) is communicated with a circulating water forebay (2) through a circulating water channel, the circulating water forebay (2) is respectively communicated with a sulfuric acid storage tank (6), a scale inhibitor dissolving tank (7) and a sodium hypochlorite storage tank (8) through a sulfuric acid adding pipeline, a scale inhibitor adding pipeline and a sodium hypochlorite adding pipeline, the water replenishing pool (3) is communicated with the circulating water forebay (2) through a water replenishing pipeline, a water replenishing pump (4) is arranged on the water replenishing pipeline, the water outlet of the circulating water forebay (2) is divided into two paths by a circulating water pump (5), one path is communicated with the water inlet of the condenser (9) through a circulating water inlet main pipe, the other path is communicated with a user through a process water pipeline, the condenser (9) is communicated with a water inlet of the high-position water receiving cooling tower (1) through a circulating water return main pipe, and the high-position water receiving cooling tower (1) is connected with a circulating water sewage discharge pipeline;
circulating water forebay (2) are provided with level gauge (10), it adds sour governing valve (11) to be provided with on the sulphuric acid pipeline to add, antisludging agent adds the antisludging agent measuring pump (12) that is provided with frequency conversion regulation on the medicine pipeline, be provided with sodium hypochlorite measuring pump (13) on the sodium hypochlorite medicine pipeline, be provided with moisturizing governing valve (14) and moisturizing flowmeter (15) on the moisturizing pipeline, be provided with pH table (16), oxidation reduction potential ORP table (17), conductivity table (18) and calcium hardness analysis appearance (19) on the circulating water sewer pipe, be provided with on the circulating water sewer pipe drain governing valve (20) and blow off water flowmeter (21), be provided with process water flowmeter (22) on the process water pipeline.
2. The automatic control system for the water quality of the cooling tower with the high-level water collection of the thermal power plant as claimed in claim 1, wherein the signal output ends of the electric conductivity meter (18) and the calcium hardness analyzer (19) are connected with the input end of a first controller (23), and the output end of the first controller (23) is connected with the control end of a sewage regulating valve (20); the signal output end of the liquid level meter (10) is connected with the input end of a second controller (24), and the output end of the second controller (24) is connected with the control end of a water supplementing regulating valve (14); the signal output end of the pH meter (16) is connected with the input end of a third controller (25), and the output end of the third controller (25) is connected with the control end of the acidification regulating valve (11); the signal output ends of the sewage flow meter (21) and the process water flow meter (22) are connected with the input end of a fourth controller (26), and the output end of the fourth controller (26) is connected with the control end of the scale inhibitor metering pump (12); the signal output end of the oxidation-reduction potential ORP meter (17) is connected with the input end of a fifth controller (27), and the output end of the fifth controller (27) is connected with the control end of a sodium hypochlorite metering pump (13).
3. The automatic water quality control system for the high-level water receiving and cooling tower of the thermal power plant as claimed in claim 2, characterized in that the water replenishing regulating valve (14) is controlled in an interlocking manner with the liquid level meter (10), the opening degree of the water replenishing regulating valve (14) is increased when the liquid level of the circulating water forebay (2) is lower than a set value, and the opening degree of the water replenishing regulating valve (14) is decreased when the liquid level of the circulating water forebay (2) is higher than the set value;
the sewage regulating valve (20) is controlled by interlocking with the conductivity meter (18) and the calcium hardness analyzer (19), the opening degree of the sewage regulating valve (20) is increased when the conductivity or the calcium hardness of the circulating water is higher than a set value of the conductivity or the calcium hardness of the circulating water, and the opening degree of the sewage regulating valve (20) is reduced when the conductivity or the calcium hardness of the circulating water is lower than the set value of the conductivity or the calcium hardness of the circulating water, so that the automatic control of the quality of the circulating;
the acidification regulating valve (11) and the pH meter (16) are controlled in an interlocking manner, when the pH value of the circulating water is higher than a set value, the opening degree of the acidification regulating valve (11) is increased, and when the pH value of the circulating water is lower than the set value, the opening degree of the acidification regulating valve (11) is reduced, so that the automatic control of the pH value of the circulating water is realized;
the scale inhibitor metering pump (12) is interlocked with the sewage discharge flow meter (21) and the process water flow meter (22) for control, and the dosage of the scale inhibitor isG=k×（Q p +Q g ）×gWhereinQ p The flow rate of the sewage is the same as that of the sewage,Q g is the flow rate of the process water,gin order to achieve the desired concentration of scale inhibitor in the circulating water,kis a correction factor; carrying out variable frequency adjustment on a scale inhibitor metering pump (12) according to the calculated real-time scale inhibitor adding amount to realize automatic control of the concentration of the scale inhibitor in circulating water;
the sodium hypochlorite metering pump (13) and the oxidation-reduction potential ORP meter (17) are in interlocking control, the sodium hypochlorite metering pump (13) is started when the ORP value of the circulating water is lower than a set value, and the sodium hypochlorite metering pump (13) is stopped when the ORP value of the circulating water is higher than the set value, so that the concentration of the oxidation type bactericide in the circulating water is automatically controlled.
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