CN212655595U - 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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- CN212655595U CN212655595U CN202021054137.2U CN202021054137U CN212655595U CN 212655595 U CN212655595 U CN 212655595U CN 202021054137 U CN202021054137 U CN 202021054137U CN 212655595 U CN212655595 U CN 212655595U
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Abstract
The utility model discloses a water quality automatic control system of a high-level water-receiving cooling tower of a thermal power plant, which comprises 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 box, a sodium hypochlorite storage tank and a condenser; the high-order water cooling tower that receives communicates through circulation water channel and circulating water forebay, the circulating water forebay is respectively through adding sulphuric acid pipeline, antisludging agent adds the medicine pipeline, sodium hypochlorite adds medicine pipeline and sulphuric acid storage tank, antisludging agent dissolves the medical kit, sodium hypochlorite storage tank intercommunication, the moisturizing pond passes through moisturizing pipeline and circulating water forebay intercommunication, the delivery port of circulating water forebay divides into two the tunnel through circulating water pump, one pass through the circulating water inlet header pipe and communicate with the water inlet of condenser, another pass through process water pipeline and communicate with the user, the condenser passes through the circulating water return header pipe and communicates with the water inlet of high-order water cooling tower that receives. The utility model discloses can practice thrift medicine and using water wisely effectively, greatly reduced circulating water quality of water fluctuation range.
Description
Technical Field
The utility model belongs to the technical field of the circulating water treatment technique and specifically relates to a cooling tower water quality automatic control system is received to thermal power plant's high-order.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the above-mentioned not enough that exists among the prior art, and provide a cooling tower water quality automatic control system is received to thermal power plant's high-order, can realize automatic benefit, drainage and automatic reagent feeding, can practice thrift medicine and using water wisely effectively, make circulating water quality of water stable in certain extent.
The utility model provides a technical scheme that above-mentioned problem adopted is: 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.
Compared with the prior art, the utility model, have following advantage and effect:
1) structural design is reasonable, through moisturizing and blowdown automatically in succession, can greatly reduced because quality of water and the fluctuation of water level that circulating water discontinuity moisturizing and blowdown arouse have apparent water conservation effect. 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 dosage can be automatically adjusted in real time, the concentration of the medicament and the quality of the circulating water are ensured to be stable in a safe and reliable range, and the risk of corrosion and scaling of a circulating water system of a high-level water collecting cooling tower is greatly reduced.
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 by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit 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, the sewage discharge water flow meter 21 and the process water flow meter 22 are controlled in an interlocking manner, and the scale inhibitor metering pump 12 is subjected to variable frequency regulation according to the calculated real-time scale inhibitor adding amount, so that the automatic control of the scale inhibitor concentration in the circulating water is realized;
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 water quality control system 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, and the controller and the calcium hardness analyzer 19 adopt the existing products.
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 4-9 mmol/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 utility model is transformed, 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 1450 mu s/cm in 1300 plus materials, and the concentration multiplying power of the circulating water is 5.5 +/-0.3. The automatic control system for the water quality of the high-level water-collecting cooling tower can effectively slow downThe technical scheme achieves the expected target of stabilizing the concentration ratio of the circulating water to 5-6 times of operation and simultaneously reducing the water intake of unit generated energy 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 not be construed as being limited to the scope of the present invention, and any modifications and alterations made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of the present invention.
Claims (2)
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).
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| CN111747561A (en) * | 2020-06-10 | 2020-10-09 | 华电电力科学研究院有限公司 | Automatic control system for water quality of high-level water collecting cooling tower of thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111747561A (en) * | 2020-06-10 | 2020-10-09 | 华电电力科学研究院有限公司 | Automatic control system for water quality of high-level water collecting cooling tower of thermal power plant |
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