CN104656692B - System and method for controlling concentration ratio of circulating water using decarbonized and demineralized water as supplementing water - Google Patents
System and method for controlling concentration ratio of circulating water using decarbonized and demineralized water as supplementing water Download PDFInfo
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- CN104656692B CN104656692B CN201510070392.3A CN201510070392A CN104656692B CN 104656692 B CN104656692 B CN 104656692B CN 201510070392 A CN201510070392 A CN 201510070392A CN 104656692 B CN104656692 B CN 104656692B
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Abstract
The invention provides a system and a method for controlling concentration ratio of circulating water using decarbonized and demineralized water as supplementing water. The system comprises a raw water tank, a decarbonized and demineralized device, a clean water tank, an electric control valve, a cooling tower tank, a condenser, a circulating water pump, a cooling tower, a first controller, a second controller, a first conductivity device for detecting conductivity of water at a water inlet in the cooling water tank, a second conductivity device for detecting conductivity of water in the cooling water tank, and a liquid level sensor for detecting a liquid level in the cooling water tank. According to the system and the method, the concentration ratio of circulating water using a high-alkalinity and high-rigidity water source as supplementing water in the cooling tower can be controlled.
Description
Technical field
The present invention relates to a kind of control system and method, and in particular to a kind of decarburization hard-off water is concentrated for the recirculated water of moisturizing
Multiplying power control system and method.
Background technology
Thermal power plant is water consumption rich and influential family, and the anxiety of water resource has been increasingly becoming the major issue that power industry faces, high
Basicity high hardness water reuse is the effective way for solving thermal power plant's shortage of water resources, but high alkalinity high hardness water has corrosion and knot
The characteristics of dirt tendency is big.Ensure that high alkalinity high hardness water is back to power plant cycle water system unit under high concentration ratio and can pacify
Full stable operation, it is necessary to which process is optimized to high alkalinity high hardness water.
The technical measures of decarburization hard-off process have Weak Acid Ion exchange sofening treatment, plus acid treatment, at lime softening
Reason, desalting processing etc..Temporary hardness in water and the most of removal of basicity can be substantially improved water by decarburization hard-off processing meanss
Source water quality, when after above-mentioned high alkalinity high hardness water is processed by decarburization hard-off device as the supplementary water of recirculated water, its water quality
Adverse factor will be depending on chloride ion content, so that chloride ion content becomes the limiting factor of recirculated water concentration rate, chlorine
Ion concentration is closely related with Circulating Water Corrosion problem, rationally control concentration rate just can effectively anti-locking system corrosion.
The eighties to the end of the nineties in 20th century, domestic industry enterprise water intaking takes relatively low, using circulating cooling water system fire
Power plant's concentration rate is universal very low, more without cooling tower automatic pollution discharge in terms of research and practice.In recent years, with country's use
Water, drainage charge policy and each electricity power group《Economical and environment-friendly coal-fired power plant standard》Promulgation, a part of thermoelectricity at home
Factory has carried out the related practice of cooling tower automatic pollution discharge, but so far without successful example.
These circulating cooling type thermal power plants generally adopt two ways：One is timing blowdown, i.e., when certain of one day is several
Section discharges a certain amount of recirculated water, and to maintain circulation salt balance, so operation often results in concentration rate and fluctuates very
Greatly；Another kind is that, according to recirculated water concentration rate blowdown, concentration rate exceeds setting value then blowdown, and concentration rate is less than setting value
Then do not arrange, in power plant's actual motion, on the premise of recirculated water downstream user urban water demand is met, recirculated water concentration rate
Fluctuating range is still larger.
The content of the invention
It is an object of the invention to overcome the shortcoming of above-mentioned prior art, there is provided a kind of decarburization hard-off water is followed for moisturizing
Ring water concentration rate control system and method, the system and method can effectively control the concentration times of recirculated water in cooling tower
Rate.
To reach above-mentioned purpose, decarburization hard-off water of the present invention is the recirculated water concentration rate control system bag of moisturizing
Include former pond, decarburization hard-off device, clear water reserviors, electric control valve, cooling tower basin, condenser, electric blowdown valve, water circulating pump,
Cooling tower, the first controller, second controller, the first electrical conductivity for detecting cooling tower basin water inlet electrical conductivity of water
Table, for detection cooling tower basin in electrical conductivity of water the second electrical conductivity table, for detection cooling tower basin in water liquid level liquid
Level sensor；
The delivery port of the former pond is connected with the water inlet of decarburization hard-off device, the delivery port of decarburization hard-off device with
The water inlet of clear water reserviors is connected, and the delivery port Jing electric control valves of clear water reserviors are connected with the water inlet of cooling tower basin, cool down
The delivery port Jing water circulating pumps of tower basin are divided into two-way, wherein be connected with the tube bank water inlet with condenser all the way, another road Jing
Fresh water (FW) booster is connected with downstream user；The tube bank delivery port of condenser is divided into two-way, wherein all the way with cooling tower in
Each shower nozzle entrance is connected, and another road is connected with electric blowdown valve；
The output end of the liquid level sensor is connected with the input of the first controller, the output end of the first controller with
The control end of the first electric control valve is connected, and the output end of the output end of the first electrical conductivity table and the second electrical conductivity table is with
The input of two controllers is connected, and the output end of second controller is connected with the control end of electric blowdown valve；
The porch of the electric blowdown valve is provided with first flowmeter, and the porch of fresh water (FW) booster is provided with second flow
Meter.
The 3rd flowmeter is provided between the delivery port and electric control valve of the clear water reserviors.
The first flowmeter, second flowmeter and the 3rd flowmeter are electromagnetic flowmeter.
Decarburization hard-off water of the present invention is comprised the following steps for the recirculated water concentration rate control method of moisturizing：
High alkalinity high hardness water carries out entering clear water reserviors after decarburization hard-off process via decarburization hard-off device in former pond, clearly
The moisture of pond output is two-way, and all the way Jing fresh water (FW)s booster enters downstream user, and the tube bank of another road Jing condensers is divided into
Two-way, enters into all the way as water is supplemented in cooling tower, and another road Jing electric blowdown valves are used as blowdown；
The liquid level information of water in liquid level sensor real-time detection cooling tower basin, and the liquid level of water in the cooling tower basin is believed
Breath is forwarded in the first controller, and the first controller judges water in cooling tower basin according to the liquid level information of water in the cooling tower basin
Liquid level whether be less than or equal to default liquid level threshold values, when the liquid level of water in cooling tower basin is less than or equal to default liquid level valve
During value, then the first electric signal is produced, and controlling electric control valve according to first electric signal enters into the water in clear water reserviors
In cooling tower basin, the first electrical conductivity table real-time detection cooling tower basin water inlet electrical conductivity of water information, and by the cooling tower
Pond water inlet electrical conductivity of water information is forwarded in second controller, water in the second electrical conductivity table real-time detection cooling tower basin
Electrical conductivity information, and by it is described cooling tower basin in electrical conductivity of water information be forwarded in second controller, second controller according to
Cooling tower basin water inlet electrical conductivity of water information must cool down chlorine ion concentration value A of tower basin water inlet water, second controller
Chlorine ion concentration value B of water inlet water in tower basin must be cooled down according to water inlet electrical conductivity of water information in cooling tower basin, and
Recirculated water is obtained according to chlorine ion concentration value B of water in chlorine ion concentration value A and cooling tower basin of cooling tower basin water inlet water
Concentration rate C, wherein, C=B/A when the concentration rate C of recirculated water is more than or equal to pre-set threshold value, then produces the second electric signal,
And blowdown is carried out according to second electric signal control electric blowdown valve opening.
The invention has the advantages that：
Decarburization hard-off water of the present invention is cooled down for the recirculated water concentration rate control system and method for moisturizing in control
During recirculated water concentration rate in tower, by the first electrical conductivity table detection cooling tower basin water inlet electrical conductivity of water information, the
Electrical conductivity of water information in two electrical conductivity tables detection cooling tower basin, second controller is according to the cooling tower basin water inlet water
Electrical conductivity of water information obtains the concentration rate C of recirculated water in electrical conductivity information and cooling tower basin, as the concentration rate C of the recirculated water
During more than or equal to pre-set threshold value, then controlling electric blowdown valve opening carries out blowdown, until the concentration rate of recirculated water is less than default
Till threshold values, so as to realize the dynamic control of the recirculated water concentration rate to cooling tower, simple structure is easy to operate.
Description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the front #1～#4 unit recirculated water concentration rate curve of cyclical fluctuations figures of transformation in embodiment one；
Fig. 3 is #1～#4 unit recirculated water concentration rate curve of cyclical fluctuations figures after transforming in embodiment one.
Wherein, 1 it is the 3rd flowmeter, 2 be electric control valve, 3 be liquid level sensor, 4 be the first electrical conductivity table, 5 is the
Two electrical conductivity tables, 6 be first flowmeter, 7 be electric blowdown valve, 8 be second flowmeter, 9 be cooling tower, 10 for cooling tower basin,
11 is clear water reserviors, 12 is fresh water (FW) booster, 13 is condenser, 14 is water circulating pump, 15 is decarburization hard-off device, 16 is raw water
Pond.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
With reference to Fig. 1, decarburization hard-off water of the present invention includes raw water for the recirculated water concentration rate control system of moisturizing
Pond 16, decarburization hard-off device 15, clear water reserviors 11, electric control valve 2, cooling tower basin 10, condenser 13, electric blowdown valve 7, circulation
Water pump 14, cooling tower 9, the first controller, second controller, for the of the detection cooling water inlet electrical conductivity of water of tower basin 10
One electrical conductivity table 4, for detection cooling tower basin 10 in electrical conductivity of water the second electrical conductivity table 5, for detection cooling tower basin 10
The liquid level sensor 3 of the liquid level of middle water；The delivery port of former pond 16 is connected with the water inlet of decarburization hard-off device 15, and decarburization takes off
The delivery port of hard device 15 is connected with the water inlet of clear water reserviors 11, delivery port Jing electric control valves 2 and the cooling of clear water reserviors 11
The water inlet of tower basin 10 is connected, and 14 points of delivery port Jing water circulating pumps for cooling down tower basin 10 are two-way, wherein all the way with condenser
13 tube bank water inlet is connected, and another road Jing fresh water (FW)s booster 12 is connected with downstream user；The tube bank of condenser 13 goes out
The mouth of a river is divided into two-way, wherein being connected with each shower nozzle entrance in cooling tower 9 all the way, another road is connected with electric blowdown valve 7；
The output end of liquid level sensor 3 is connected with the input of the first controller, the output end of the first controller and the first electric adjustable
The control end of section valve 2 is connected, and the output end of the output end of the first electrical conductivity table 4 and the second electrical conductivity table 5 is controlled with second
The input of device is connected, and the output end of second controller is connected with the control end of electric blowdown valve 7；Electric blowdown valve 7
Porch is provided with first flowmeter 6, and the porch of fresh water (FW) booster 12 is provided with second flowmeter 8.
It should be noted that being provided with the 3rd flowmeter 1 between the delivery port of the clear water reserviors 11 and electric control valve 2；The
Flow meters 6, the flowmeter 1 of second flowmeter 8 and the 3rd are electromagnetic flowmeter.
Decarburization hard-off water of the present invention is comprised the following steps for the recirculated water concentration rate control method of moisturizing：
High alkalinity high hardness water carries out entering clear water after decarburization hard-off process via decarburization hard-off device 15 in former pond 16
Pond 11, the moisture of the output of clear water reserviors 11 is two-way, and all the way Jing fresh water (FW)s booster 12 enters downstream user, another road Jing condensers
13 tube bank is divided into two-way, enters into all the way as water is supplemented in cooling tower 10, and another road Jing electric blowdown valves 7 make as blowdown
With；
The liquid level information of water in the real-time detection of liquid level sensor 3 cooling tower basin 10, and cool down water in tower basin 10 by described
Liquid level information is forwarded in the first controller, and the first controller judges cooling according to the liquid level information of water in the cooling tower basin 10
Whether the liquid level of water is less than or equal to default liquid level threshold values in tower basin 10, when the liquid level of water in cooling tower basin 10 is less than or equal to
During default liquid level threshold values, then producing the first electric signal, and control electric control valve 2 according to first electric signal makes clear water reserviors
Water in 11 is entered in cooling tower basin 10, the real-time detection of the first electrical conductivity table 4 cooling water inlet electrical conductivity of water of tower basin 10
Information, and the cooling water inlet electrical conductivity of water information of tower basin 10 is forwarded in second controller, the second electrical conductivity table 5
Electrical conductivity of water information in real-time detection cooling tower basin 10, and electrical conductivity of water information in the cooling tower basin 10 is forwarded to into the
In two controllers, second controller must cool down the water inlet of tower basin 10 according to the cooling water inlet electrical conductivity of water information of tower basin 10
Chlorine ion concentration value A of water, second controller must cool down tower basin according to water inlet electrical conductivity of water information in cooling tower basin 10
Chlorine ion concentration value B of water inlet water in 10, and chlorine ion concentration value A according to the cooling water inlet water of tower basin 10 and cooling
Chlorine ion concentration value B of water obtains the concentration rate C of recirculated water in tower basin 10, wherein, C=B/A, as the concentration rate C of recirculated water
During more than or equal to pre-set threshold value, then produce the second electric signal, and according to second electric signal control electric blowdown valve 7 open into
Row blowdown.
When downstream user water requirement is zero, theoretical blowdown flow rate is actual blowdown flow rate QActual blowdown=QTheoretical blowdown-QDownstream user。
Embodiment one
Shandong power plant, with high alkalinity high rigidity water source as cooling tower raw make up water, in order to increase water-saving benefit, plans circulation
At 6 times, Fig. 2 is adopted when controlling manually the control of water concentration rate for the blowdown of factory's cooling tower 9, the concentration of #1～#4 unit recirculated waters
The multiplying power curve of cyclical fluctuations, all in all, recirculated water concentration rate excursion is all very big, #1～#4 units concentration rate whole year crest
Value fluctuating range is up to 31%, and valley value fluctuating range is up to 55%, #1～#4 units whole year concentration rate mean value and is
2.95～3.36, far below power plant's aspiration level.
Based on recirculated water concentration rate control system is to circulate relation of the water conductivity with concentration rate, for this purpose, research
The relation of above-mentioned Shandong power plant #1～#4 units circulation water conductivity and concentration rate.Table 1 is the circulation of #1～#4 units
Water concentration rate, electrical conductivity, chlorion relation.
Table 1
Can show that #1～#4 units circulation water conductivity is with the relation function of concentration rate by the data in table 1：
D=648.69KCl+ 445.55, R2=0.989
Wherein, D is circulation water conductivity, R2=0.989, recirculated water concentration rate is good with electrical conductivity linear relationship, the letter
Exponential model is the electric power plant circulating water concentration rate systems stabilisation control logic.
According to power plant's water-economizing project feasibility study scheme, #1～#4 unit recirculated water concentration rate setting values take
KCl=6, the function model being worth to concentration rate actual test by #1～#4 units circulation water conductivity is determined in KCl=6
When, electrical conductivity is 4337 μ S/cm (25 DEG C).
When #1～#4 units circulation water conductivity is 4337 μ S/cm, i.e., when concentration rate reaches 6, electric blowdown valve 7 is opened
Open, concrete control strategy is：The flow of downstream user is such as detected, it is many for downstream user, using measurement downstream user
Total Water.
Sewage door flow=theory blowdown flow rate (KClThe total Water of=6)-downstream user
When the water yield >=theory blowdown flow rate of detection to downstream user, electric blowdown valve 7 is closed；When detecting cooling column water
In below 1.5m, electric blowdown valve 7 is closed for position.
To guarantee the blowdown of #1～#4 units cooling tower 9 promptly and accurately, need to set up the aperture of electric blowdown valve 7 and cooling tower 9
The relation of water amount of blowdown, according to the actual water amount of blowdown of electric blowdown valve 7, by second controller the aperture of electric blowdown valve 7 is controlled.Should
Power plant #1～aperture of 9 electric blowdown valve of #4 units cooling tower 7 is shown in Table 2 with water amount of blowdown relation.
Table 2
In below 1.5m, the aperture of electric control valve 2 is 100% to cooling column water level, and cooling column water level is in 1.5m to 1.75m
Between when, the aperture of electric control valve 2 be 50% to 75%, in more than 1.8m, the aperture of electric control valve 2 is cooling column water level
25% to 50%.
Implementation result：The power plant completes circulation of #1～#4 units with high alkalinity high rigidity water source as cooling tower raw make up water
The installation of water concentration rate control system hardware device and instrument.Power plant #1～concentration rate of #4 units cooling tower 9 after transformation
As shown in figure 3, the concentration rate of #1～#4 units cooling tower 9 fluctuates between 5.51～6.64, mean value is 6.0 to the curve of cyclical fluctuations,
Crest value maximum fluctuation amplitude is 10%, and valley value fluctuating range is 8%, and compared with before transformation, crest value fluctuating range is reduced
67%, valley value fluctuating range reduces 85%.Recirculated water concentration rate can be stablized in setting value 6.0 ± 0.5.
It is big that the automatic blowdown system of improved cooling tower 9 can effectively buffer the concentration rate caused because blowdown flow rate is excessive
Fluctuation, recirculated water automatic pollution discharge control program reached I phases, the stable high value in setting of II phase recirculated waters concentration rate
The target of 6 times of operations, the application of the technology, it is ensured that Shandong power plant I phases, II phases generating set are in dry ash whole export trade
Under conditions of, unit generated energy water withdrawal drops to 2.0m3The similar unit advanced level of/(MWh).
Claims (3)
1. a kind of decarburization hard-off water is the recirculated water concentration rate control method of moisturizing, it is characterised in that based on decarburization hard-off water
For the recirculated water concentration rate control system of moisturizing, the decarburization hard-off water is the recirculated water concentration rate control system bag of moisturizing
Include former pond (16), decarburization hard-off device (15), clear water reserviors (11), electric control valve (2), cooling tower basin (10), condenser
(13), electric blowdown valve (7), water circulating pump (14), cooling tower (9), the first controller, second controller, for detect cooling
First electrical conductivity table (4) of tower basin (10) water inlet electrical conductivity of water, for electrical conductivity of water in detection cooling tower basin (10)
The second electrical conductivity table (5), for the liquid level sensor (3) of the liquid level of water in detection cooling tower basin (10)；
The delivery port of the former pond (16) is connected with the water inlet of decarburization hard-off device (15), decarburization hard-off device (15)
Delivery port is connected with the water inlet of clear water reserviors (11), delivery port Jing electric control valves (2) and the cooling tower basin of clear water reserviors (11)
(10) water inlet is connected, cool down tower basin (10) delivery port Jing water circulating pumps (14) be divided into two-way, wherein all the way with condensing
The tube bank water inlet of device (13) is connected, and another road Jing fresh water (FW) boosters (12) are connected with downstream user；Condenser (13)
Tube bank delivery port be divided into two-way, wherein be connected with each shower nozzle entrance in cooling tower (9) all the way, another road and electronic blowdown
Valve (7) is connected；
The output end of the liquid level sensor (3) is connected with the input of the first controller, the output end of the first controller with
The control end of electric control valve (2) is connected, the output end of the output end of the first electrical conductivity table (4) and the second electrical conductivity table (5)
It is connected with the input of second controller, the output end of second controller is connected with the control end of electric blowdown valve (7)；
The porch of the electric blowdown valve (7) is provided with first flowmeter (6), and the porch of fresh water (FW) booster (12) is provided with
Two flowmeters (8)；
Comprise the following steps：
The interior high alkalinity high hardness water of former pond (16) carries out entering clear water after decarburization hard-off process via decarburization hard-off device (15)
Pond (11), the moisture of clear water reserviors (11) output is two-way, and all the way Jing fresh water (FW)s booster (12) enters downstream user, another road Jing
The tube bank of condenser (13) is divided into two-way, enters into all the way in cooling tower (10) as supplementary water, another road Jing electric blowdown valves
(7) use as blowdown；
The liquid level information of water in liquid level sensor (3) real-time detection cooling tower basin (10), and cool down water in tower basin (10) by described
Liquid level information be forwarded in the first controller, the first controller judges according to the liquid level information of water in cooling tower basin (10)
Whether the liquid level of water is less than or equal to default liquid level threshold values in cooling tower basin (10), and the liquid level of water is little in tower basin (10) is cooled down
In or during equal to default liquid level threshold values, then produce the first electric signal, and electric control valve is controlled according to first electric signal
(2) water in clear water reserviors (11) is made to enter in cooling tower basin (10), the first electrical conductivity table (4) real-time detection cooling tower basin (10)
Water inlet electrical conductivity of water information, and cooling tower basin (10) the water inlet electrical conductivity of water information is forwarded to into the second control
In device processed, electrical conductivity of water information in the second electrical conductivity table (5) real-time detection cooling tower basin (10), and by the cooling tower basin
(10) electrical conductivity of water information is forwarded in second controller in, and second controller is according to cooling tower basin (10) water inlet water
Electrical conductivity information must cool down chlorine ion concentration value A of tower basin (10) water inlet water, and second controller is according to cooling tower basin (10)
Middle electrical conductivity of water information must cool down chlorine ion concentration value B of water in tower basin (10), and according to cooling tower basin (10) water inlet
Chlorine ion concentration value B of water obtains the concentration rate C of recirculated water in chlorine ion concentration value A of water and cooling tower basin (10), wherein, C
=B/A, when the concentration rate C of recirculated water is more than or equal to pre-set threshold value, then produces the second electric signal, and electric according to described second
Signal control electric blowdown valve (7) is opened and carries out blowdown.
2. decarburization hard-off water according to claim 1 is the recirculated water concentration rate control method of moisturizing, it is characterised in that
The 3rd flowmeter (1) is provided between the delivery port and electric control valve (2) of the clear water reserviors (11).
3. decarburization hard-off water according to claim 2 is the recirculated water concentration rate control method of moisturizing, it is characterised in that
The first flowmeter (6), second flowmeter (8) and the 3rd flowmeter (1) are electromagnetic flowmeter.
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| CN104991579A (en) * | 2015-07-03 | 2015-10-21 | 西安西热水务环保有限公司 | System and method for controlling concentration ratio of open type circulating cooling water system |
| CN105912038A (en) * | 2016-05-26 | 2016-08-31 | 大唐国际发电股份有限公司张家口发电厂 | Water tower water level automatic regulating device with condensation ratio serving as core |
| CN106774020A (en) * | 2017-02-16 | 2017-05-31 | 神华集团有限责任公司 | For the aeration water quality regulating device of spike cooling system |
| CN110195619A (en) * | 2019-05-30 | 2019-09-03 | 中国水利水电科学研究院 | Fired power generating unit regulating system, method and device |
| CN111573900B (en) * | 2020-05-29 | 2021-12-14 | 中国水利水电科学研究院 | Dynamic regulation and control system and method for concentration multiple of circulating cooling water tower |
| CN112723453B (en) * | 2020-12-23 | 2023-08-04 | 武汉天空蓝环保科技有限公司 | Desulfurization wastewater zero discharge system for dry slag cooling |
| CN113125964A (en) * | 2021-03-31 | 2021-07-16 | 大连擎研科技有限公司 | Circulating water integrated measurement and control system of fuel cell test bed and use method thereof |
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| JP3780965B2 (en) * | 2002-03-13 | 2006-05-31 | 栗田工業株式会社 | Cooling water system concentration management method |
| JP2003269889A (en) * | 2002-03-18 | 2003-09-25 | Kurita Water Ind Ltd | Operation controlling method for water treatment apparatus |
| CN102444592A (en) * | 2010-09-30 | 2012-05-09 | 诸小莉 | Protective device for magnetic pump |
| CN102004458B (en) * | 2010-11-18 | 2013-04-17 | 金红玲 | Circulating water quality control system |
| CN102173526B (en) * | 2011-03-08 | 2014-08-06 | 天津滨瀚环保科技发展有限公司 | Method for using brine generated after seawater desalination as circulating cooling water for cooling tower of power plant |
| CN102445929B (en) * | 2011-09-20 | 2014-07-16 | 成都昊特新能源技术股份有限公司 | Circulated water system of thermal power plant |
| JP2014061494A (en) * | 2012-09-21 | 2014-04-10 | Miura Co Ltd | Water treatment system |
| CN203159359U (en) * | 2012-10-16 | 2013-08-28 | 吴来贵 | An operation device for a circulating cooling water system with a high concentration ratio |
| CN104058509B (en) * | 2014-05-30 | 2015-07-08 | 中国海洋石油总公司 | Electrochemical water treatment device and intelligent control system for circulating water system |
| CN204440183U (en) * | 2015-02-10 | 2015-07-01 | 西安西热水务环保有限公司 | A kind of decarburization hard-off water is the recirculated water concentration rate control system of moisturizing |
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