CN101071053A - Open industrial circulating-cooling water concentrating ratio and drug concentration balance control method - Google Patents
Open industrial circulating-cooling water concentrating ratio and drug concentration balance control method Download PDFInfo
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- CN101071053A CN101071053A CN 200710021072 CN200710021072A CN101071053A CN 101071053 A CN101071053 A CN 101071053A CN 200710021072 CN200710021072 CN 200710021072 CN 200710021072 A CN200710021072 A CN 200710021072A CN 101071053 A CN101071053 A CN 101071053A
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Abstract
The invention provides a kind lf balance control way of open style industry recycling cooling water's weight concentration and pharmacy concentration .And weight concentration balance control way mainly controls the amount of water and salt of the industry recycling cooling water system ,according to the weight concentration N to control the add water and sewage water effectively to realize the balance control over the weight concentration of the industry recycling cooling water .And the pharmacy concentration balance control way is carried out on the basis of the weight concentration balance control way ,on the basis of weight concentration no change ,through adjusting and controlling the add water amount and dosing amount's proportion ,making the add dosage equal to the losing dosage in the same time of the system ,so realizing the pharmacy concentration keeping no change in the recycling water .The invention's advantages are saving water source ,keeping water quality stable ,etc.
Description
Technical field
The present invention relates to a kind of control method of open type industrial circulating cooling water, the balance control method of especially a kind of open industrial circulating-cooling water concentrating ratio and drug concentration.
Background technology
At present, the basic skills of China's control open industrial circulating-cooling water concentrating ratio is by the concentration of certain material in the periodic analysis recirculated water, calculates cycles of concentration according to the densimeter of certain material in the supplementing water again.Rule of thumb regulating amount of makeup water or water amount of blowdown then keeps system's water yield and controls cycles of concentration.Through overregulating, whether cycles of concentration is controlled accurately actually, must wait until and analyze next time and could understand.If variation has taken place evaporation of water amount during this, then cycles of concentration is certain to change, but must wait until that analysis result comes out to adjust again next time.Also there is enterprise to control cycles of concentration to monitor additional electrical conductivity of water and circulation electrical conductivity of water.But the factor that influences electrical conductivity in the water is too many, as the activity of microorganism in the water, glutinous mud amount, turbidity, corrosion product, add acid and transfer adding of PH, bactericide or the like, the capital exerts an influence to the circulation electrical conductivity of water, and the accuracy of controlling cycles of concentration with the monitoring electrical conductivity is caused interference.So there is following some deficiency in this method: 1, the mensuration of potassium ion adopts flame photometer, calculates cumbersome; 2, monitored density is not high, and control has hysteresis quality; 3, flow-control entirely by rule of thumb, actually or regulate the amount of makeup water water amount of blowdown? be regulated quantity what best? operation lacks science data and supports; 4, chlorion is subjected to the interference of chlorination sterilization, calculates to cause a deviation easily; 5, the cycles of concentration fluctuation is bigger; 6, cycles of concentration can not direct-reading, can not realize automatic control.
The adding method thereof that current open type industrial circulating cooling water is handled has three kinds: dosing method at regular time and quantity, proportion expression dosing method and spike type dosing method.Dosing method at regular time and quantity is meant by per tour operating personnel and adds a certain amount of corrosion inhibiting and descaling agent in recirculated water; Proportion expression dosing method is meant the certain proportion dosing in water according to the supplementing water water yield; Spike type dosing method is to point to add a certain amount of tracer in the water, monitors tracer concentration then, and determines that according to the variation of tracer concentration drug concentration and control add dose; Adopt adding method thereof at regular time and quantity, manually-operated often, its deficiency mainly contain following some: 1, concentration changes greatly: concentration is low before the concentration height after the dosing, dosing.2, cycles of concentration fails to be effectively controlled, and drug concentration also fluctuates with the fluctuation of cycles of concentration.3, the randomness of artificial dosing is bigger, and metering accuracy is difficult to guarantee.4, labor strength is bigger.Employing proportion expression adding method thereof, often also because the cycles of concentration of recirculated water fails to be effectively controlled, drug concentration can not get guaranteeing.Adopting spike type adding method thereof, is current state-of-the-art a kind of Automatic Dosing method.Its equipment has import, also has homemade.But in use, also find some problems.As add non-oxidizable bactericide to the data drift problem of the conforming problem of hydrolysis rate of the decomposition rate of the interference problem of tracing instrument, tracer and corrosion inhibiting and descaling agent, drug concentration that instrument detected and accuracy problem thereof or the like.
Summary of the invention
1, goal of the invention: present open industrial circulating-cooling water concentrating ratio and drug concentration control method are passive in order to solve, hysteresis, problem such as lack of standardization, the invention provides the balance control method of a kind of open industrial circulating-cooling water concentrating ratio and drug concentration, this balance control method can not only the conserve water resource, reduce blowdown, prolong the safety in production cycle, improve technical level, managerial skills and operating efficiency, and can bring huge economic benefit to enterprise.
2, technical scheme: a kind of open industrial circulating-cooling water concentrating ratio balance control method of the present invention is characterized in that: it has two kinds of control methods to realize industrial circulating-cooling water concentrating ratio is controlled.
Cycles of concentration balance control method first method is divided realization and is controlled two stages the cycles of concentration of industrial circulating cooling water is controlled, and wherein the operating procedure of cycles of concentration implementation phase is:
(1) according to supplementing water water quality particularly the performance of the hard and total alkalinity of the calcium in the water, reagent combination determine target cycles of concentration N through experiment sieving;
(2) collecting-tank to the open type industrial circulating cooling water system injects fresh water, by flowmeter injected water volume is accurately measured, and confirms system volume V;
(3) under not heat exchange of heat exchanger situation, the water circulating pump in the affirmation recirculating cooling water system is at the oepration at full load state, thereby the liquid level of inciting somebody to action water in collecting-tank this moment is chosen to be the standard liquid level that the recirculating cooling water system water yield is controlled;
(4) make the heat exchanger in the recirculating cooling water system enter the heat exchange state,, under the situation of not carrying out blowdown, control amount of makeup water, the system volume V of recirculated cooling water is remained unchanged according to selected standard liquid level;
(5) by the flow integrator in the recirculating cooling water system amount of makeup water is added up, when accumulative total amount of makeup water=system volume V * (N-1), confirm that target cycles of concentration N realizes, enters the cycles of concentration control stage;
The operating procedure in cycles of concentration control stage is:
(1) controls the size of amount of makeup water according to the variation of the standard liquid level in the collecting-tank, and the size of amount of makeup water is monitored and add up by instrument;
(2) the amount of makeup water numerical value that records according to instrument and with itself and target cycles of concentration N, wind water amount of seepage numerical value substitution blowdown control water yield computing formula together,
The blowdown control water yield=amount of makeup water ÷ N-wind water amount of seepage makes water amount of blowdown synchronous operation under amount of makeup water control;
The operating procedure of cycles of concentration balance control method second method is:
(1) determines target cycles of concentration N;
(2) collecting-tank to the open type industrial circulating cooling water system injects fresh water, by flowmeter injected water volume is accurately measured, and confirms system volume V;
(3) under not heat exchange of heat exchanger situation, the water circulating pump in the affirmation recirculating cooling water system is at the oepration at full load state, thereby the liquid level of inciting somebody to action water in collecting-tank this moment is chosen to be the standard liquid level that the recirculating cooling water system water yield is controlled;
(4) make the heat exchanger in the recirculating cooling water system enter the heat exchange state, according to the operating procedure in cycles of concentration control stage in first kind of scheme amount of makeup water and water amount of blowdown are controlled immediately then, make system slowly realize target cycles of concentration N automatically, finally control by the target cycles of concentration N that realizes.
In order to guarantee the accuracy of cycles of concentration, the data of wind water amount of seepage must be correct.So the wind water amount of seepage can be according to formula:
Wind water amount of seepage=(the actual cycles of concentration of accumulative total amount of makeup water ÷-accumulative total water amount of blowdown) ÷ hours of operation draws, wherein add up the accumulative total amount of makeup water that amount of makeup water is meant supplementing water flow integrating instrument record, the accumulative total water amount of blowdown is meant the accumulative total water amount of blowdown of blowdown flow integrating instrument record, actual cycles of concentration is meant the actual cycles of concentration that the one-period end is analyzed out, and the time standard of one-period should be: accumulative total water amount of blowdown 〉=system volume V needed running time.In case of necessity, the wind water amount of seepage can repeated multiple times calculate and adjust, in the hope of accurately, but but cycle proper extension.
A kind of industrial circulating cooling water drug concentration balance control method of the present invention is characterized in that: this drug concentration balance control method must carry out on the basis of cycles of concentration balance control, and its operating procedure is:
(1) calculate the content of dispersion numerical value of supplementing water according to the content of dispersion of the desired recirculated water of water treatment scheme according to formula:
Supplementing water content of dispersion=recirculated water content of dispersion ÷ N
(2) the content of dispersion numerical computations of the supplementing water that draws according to medicament effective ingredient percentage composition and step (1) goes out the dosing numerical quantity of every cubic metre of supplementing water:
Every cubic metre of supplementing water adds the content of dispersion ÷ medicament effective ingredient percentage composition (g/m of dose=supplementing water
3);
(3) the every cubic metre of supplementing water dosing numerical quantity that draws according to amount of makeup water and step (2) carries out the proportion expression dosing in proportion in recirculating cooling water system, adds dose and increases and decreases with the increase and decrease of amount of makeup water.
Realization principle of the present invention: cycles of concentration balance control method of the present invention is to realize by the water balance and the salt balance of control recirculating cooling water system.Water balance make the water yield of the system of entering equal the water yield of system with wall losses exactly, thereby the system Total Water of making remains unchanged.Salt balance, exactly make the salt amount of the system of entering equal the salt amount of system with wall losses, thus total keep the salt amount of system constant.When the Total Water of system and total salt amount were all constant, the salt content of recirculated water can not change certainly yet, and was constant if the salt content of supplementing water is also stablized, and then cycles of concentration is stablized constant certainly.In the open type recirculating cooling water system, enter the salt content of the salt amount=amount of makeup water * supplementing water of system; Because the evaporated water of system only loses water and does not lose salt, so the salt content of the salt amount of system loss=(water amount of blowdown+wind water amount of seepage) * recirculated water.Because the salt content of the salt content ÷ supplementing water of cycles of concentration=recirculated water, so, just realized the salt balance of system as long as make amount of makeup water ÷ cycles of concentration=(water amount of blowdown+wind water amount of seepage).In the control system salt balance, the water balance of necessary control system.Even because total salt amount of system does not become, if variation has taken place Total Water, the salt content of recirculated water has still changed, cycles of concentration has also just changed.So the control cycles of concentration should be controlled salt balance, controls water balance again, Neither of the two can be dispensed.
Drug concentration balance control method of the present invention is to carry out on the basis of cycles of concentration balance control, promptly on the basis that the recirculating cooling water system cycles of concentration remains unchanged, by regulating and control amount of makeup water and the ratio that adds dose, the dose of adding system is equated with the dose of wall losses with system, remain unchanged to realize the drug concentration in the recirculated water.Because in the unit interval, according to formula:
Enter the content of dispersion of the dose=amount of makeup water * supplementing water of system
And in recirculating cooling water system:
The content of dispersion of the dose of system loss=(blowdown+wind water amount of seepage) * recirculated water is according to the formula of control cycles of concentration salt balance:
Amount of makeup water ÷ N=water amount of blowdown+wind water amount of seepage
And
Supplementing water content of dispersion=recirculated water content of dispersion ÷ N
So in the unit interval: the dose that enters the dose=system loss of system
3, beneficial effect: the balance control method of open industrial circulating-cooling water concentrating ratio of the present invention and drug concentration can accurately be controlled the cycles of concentration and the drug concentration of recirculated cooling water reposefully, its beneficial effect is as follows: 1, because cycles of concentration precise control, steady, circulation just can remain on relatively than even running under the high concentration multiple, thereby the minimizing amount of makeup water, the conserve water resource.2, cycles of concentration has improved, and water amount of blowdown has just reduced, and has stopped blindly blowdown simultaneously again.And the minimizing of blowdown flow rate is very favourable to the protection of environment.3, the stable and cycles of concentration of drug concentration is stable, is very beneficial for the stable of water quality, when water stabilization, just help the safe operation of production equipment long period, and the prolongation of device security production cycle can promote development of productivity again.4, drug concentration is stable, has improved the service efficiency of medicament.Owing to stopped blindly dosing, reduced the reagent consumption amount, both saved resource, saved spending again, also reduced pollution.5, the application of balance control method is converted into control to discharge to the control to cycles of concentration, thereby for the automatic control of cycles of concentration and dosing provides good condition, will promote water treatment industry technical merit and management development.6, because the operation of cycles of concentration is accurately steady, just can prolong the analytical cycle of water quality, add the application of automatic control technology, can alleviate water treatment worker's labour intensity, improve their operating efficiency.7, the saving of resource, the minimizing of blowdown, the prolongation in safety in production cycle, the raising of technical merit and management development and operating efficiency will bring huge economic benefit to enterprise.8, the saving of resource, the minimizing of blowdown meets the national industrial policies of resource-conserving, production environment-friendly type fully.
The specific embodiment
Cycles of concentration balance control method implementation method.
The cycles of concentration balance control method has two kinds of control methods can realize industrial circulating-cooling water concentrating ratio is controlled.Its concrete operations step is: 1, according to supplementing water water quality particularly hard and total alkalinity, selection reagent combination of the calcium in the water do dynamic analog test, determine the recycling rate of waterused that can improve water, the cycles of concentration N of economical rationality again through screening.2, confirm system volume V, the collecting-tank adding fresh water to recirculating cooling water system accurately measures injected water volume by flowmeter.3, selected standard liquid level, confirm after the system volume V, under not heat exchange of heat exchanger situation, confirm in the recirculating cooling water system water circulating pump again at the oepration at full load state, thereby will this moment in the collecting-tank liquid level of water be chosen to be the standard liquid level of recirculating cooling water system water yield control.4, implement the control scheme.After the heat exchanger in the recirculating cooling water system enters the heat exchange state, the scheme that realizes the target cycles of concentration has two kinds, a kind of method is according to the standard liquid level, the control amount of makeup water, not blowdown, the water balance of maintenance system, and amount of makeup water added up, when accumulative total amount of makeup water=system volume V * (N-1), confirm that the target cycles of concentration realizes, enter the cycles of concentration control stage then.Another kind method is after the heat exchanger in the recirculating cooling water system enters the heat exchange state, to control by the control method in cycles of concentration control stage immediately.With standard liquid level control moisturizing, with amount of makeup water control water amount of blowdown, moisturizing and blowdown are carried out synchronously, and the target cycles of concentration just can slowly be realized.More than two kinds of methods cut both ways, the water saving of without exhaust waste scheme realizes that the time of target cycles of concentration is short.But shortcoming also clearly, and the time of staying of medicament in water is longer, and the possibility that the phosphoric acid salt crust takes place is arranged.The scheme of blowdown can be controlled the time of staying of medicament in water, but realizes the chronic of target cycles of concentration.So in practical operation, parameters balances such as the time of staying that should allow according to system volume, cycles of concentration, medicament, water quality, powder performance are selected for use.
After entering the cycles of concentration control stage, water balance that should control system, the salt balance of control system again.Concrete implementation step is: 1, by instrument the size of amount of makeup water is monitored and add up, and control the size of amount of makeup water according to the variation of the standard liquid level in the collecting-tank.When liquid level reduces, just strengthen amount of makeup water; When liquid level raises, just reduce amount of makeup water; Work as liquid level equilibrium, just keep amount of makeup water constant.2, the amount of makeup water numerical value that records according to instrument and with itself and target cycles of concentration N, wind water amount of seepage numerical value substitution blowdown control water yield computing formula together, make water amount of blowdown operation under amount of makeup water control, promptly water amount of blowdown increases and decreases along with the increase and decrease of amount of makeup water.The computing formula of the blowdown control water yield is:
The blowdown control water yield=amount of makeup water ÷ N-wind water amount of seepage (m
3/ h).
In the formula, the wind water amount of seepage can obtain by the following method: under the situation that can not confirm the wind water amount of seepage, can estimate a value according to system status.If the pipe network quality is good, management puts in place, and leakage is very little, and water collection device is also better, and the wind water amount of seepage can be estimated and be (2～5) m
3/ h.Then with target cycles of concentration and wind water amount of seepage discreet value substitution blowdown control water yield formula, (concept of time of one-period is: the blowdown accumulated water volume 〉=needed hours of operation of system volume V) to make water amount of blowdown move one-period under amount of makeup water control, the actual cycles of concentration at meticulous sense cycle end, come the anti-wind water amount of seepage of asking in view of the above:
Wind water amount of seepage=(the actual cycles of concentration of accumulative total amount of makeup water ÷-accumulative total water amount of blowdown) ÷ hours of operation (m
3/ h).
In case of necessity, the wind water amount of seepage can repeated multiple times calculate and adjust, in the hope of accurately, but but cycle proper extension.
After the control of realization to cycles of concentration N, should strengthen daily management to circulation.Mainly contain following some: 1, reduce leakage and keep it stable as far as possible.If even leakage arrives not blowdown greatly, the degree that cycles of concentration does not increase yet, then the cycles of concentration control is not got on.2, system's flushing, backwash water will be made a plan, according to plan Gui Ding the water yield and time water.Its water yield should be included in the blowdown Total Water.3, forbid process unit discharge cycle water privately.4, the recirculated water of analytical sampling collection will reclaim the system of entering as far as possible.5, other dehydration factors of strict control system.6, reinforcement keeps the stable of supplementing water water quality as far as possible to the monitoring of supplementing water water quality.
In the day-to-day operation process, evaporated water often changes because of the variation of temperature or system's thermic load.And under the situation of balancing method control cycles of concentration, the variation of evaporated water is to the not influence of control of cycles of concentration.This be because, when the evaporation water quantitative change was big, amount of makeup water and water amount of blowdown strengthened simultaneously, system's water yield obtains effectively additional; When evaporated water diminished, amount of makeup water and water amount of blowdown reduced simultaneously, and system's water yield is effectively controlled.And no matter how amount of makeup water and water amount of blowdown change, and its salt balance relation remains unchanged, and system's Total Water and total salt amount remain unchanged, so cycles of concentration also remains constant.
For the variation of explanation evaporated water to not influence of the control of cycles of concentration, establish cycles of concentration N=4, the wind water amount of seepage is 5m
3/ h, quantity of circulating water are 10000m
3During/h under the different evaporated waters result of calculation of amount of makeup water and water amount of blowdown list in the table 1.The computing formula of amount of makeup water and water amount of blowdown is: establishing amount of makeup water is X,
Then: X=X ÷ cycles of concentration+evaporated water
Water amount of blowdown=X ÷ cycles of concentration-wind water amount of seepage
The calculated value of amount of makeup water and water amount of blowdown under the different evaporated waters of table 1
| Evaporated water m 3/h | ?140 | ?150 | ?160 | ?170 |
| Quantity of circulating water m 3/h | ?10000 | ?10000 | ?10000 | ?10000 |
| Wind water amount of seepage m 3/h | ?5 | ?5 | ?5 | ?5 |
| Cycles of concentration | ?4 | ?4 | ?4 | ?4 |
| Amount of makeup water m 3/h | ?186.67 | ?200 | ?213.33 | ?226.66 |
| Water amount of blowdown m 3/h | ?41.67 | ?45 | ?48.33 | ?51.66 |
As can be seen from Table 1, along with the variation of evaporated water, amount of makeup water and water amount of blowdown also correspondingly change, and have kept the water balance of system: amount of makeup water=evaporated water+water amount of blowdown+wind water amount of seepage; The salt balance that has kept simultaneously system again: amount of makeup water/cycles of concentration=water amount of blowdown+wind water amount of seepage.
Under the equitable control of cycles of concentration, because the variation of evaporated water is to not influence of cycles of concentration, this has just overcome the influence of the variation of system's thermic load to cycles of concentration, has overcome also that temperature Change influence evaporation capacity and to the influence of cycles of concentration generation.
Control under the situation of cycles of concentration at present general salt content, often because the salt content in the supplementing water changes and encounters difficulties by in analysis cycle water and the supplementing water.And in fact the salt content of supplementing water never is unalterable.According to the source situation of water, use surface water more sometimes, use underground water more sometimes, salt content just constantly changes.Even all use surface water, the salt content of wet season is low, and the salt content in dry season is higher, so be difficult to control accurately.And under the situation of balancing method control cycles of concentration, owing to controlled salt balance, remaining N between amount of makeup water and (blowdown flow rate+wind leakage): 1 proportionate relationship, so no matter how how the salt content of supplementing water changes, its cocnentration factor is constant all the time.This has just overcome the influence of supplementing water water source variation to cycles of concentration.
Under the condition of balancing method control cycles of concentration, be can be under the situation of ordinary production and adjust cycles of concentration.If heighten cycles of concentration, can suspend blowdown; If adjusting range is bigger,, can take segmentation to adjust the method for cycles of concentration for avoiding the overstand of medicament in water.According to the salt balance principle calculate needs replenish the system that enters the adjustment period between total amount of makeup water;
Total amount of makeup water=(fresh target cycles of concentration-existing cycles of concentration) * system volume (m
3).
When the adjustment period between total amount of makeup water all joined in the system by method by water balance, can confirm to have realized new target cycles of concentration, and change the cycles of concentration control program over to.If turn down cycles of concentration, as long as with in the new target cycles of concentration substitution blowdown control water yield computing formula, water amount of blowdown is moved under the control of amount of makeup water by new formula, cycles of concentration will drop to new target cycles of concentration reposefully.
Notion and implementation step for the cycles of concentration balance control method more clearly is described now provide embodiment 1.
The quantity of circulating water of certain recirculating cooling water system is 10000m
3/ h, establishing actual wind water amount of seepage is 8m
3/ h requires cycles of concentration is carried out control automatically by 5 times.
According to cycles of concentration balance control method implementation step, 1, at first confirm that the target cycles of concentration is 5 times; 2, after system is injected into fresh water, flow integrator shows, injects 2562m altogether
3Water is so the affirmation system volume is 2562m
33, the heat exchanger in the affirmation system when water circulating pump reaches full load condition, has been full of water in the system pipe network equipment at not heat exchange state, and liquid level instrument shows that the collecting-tank liquid level is 2.58m, so 2.58m is elected to be the standard liquid level of control water balance.4, realize target cycles of concentration Scheme Selection.Thermic load estimation evaporated water according to system's design is 160m
3/ h; Estimating the wind water amount of seepage according to system hardware and management condition is 4m
3/ h, establishing amount of makeup water is X, with above parameter substitution amount of makeup water computing formula:
X＝X÷5+160＝200m
3/h
Water amount of blowdown=200 ÷ 5-4=36m
3/ h
The medicament time of staying=2562 ÷ (36+4)=64.05h
Because the time of staying of medicament in water is greater than " Code for design of industrial recirculating cooling water " official hour 50 hours, so select cycles of concentration balance control method second method.Enter the cycles of concentration control stage then.With 5 times of cycles of concentration and wind water amount of seepage discreet value 4m
3/ h this two parameter input cycles of concentration and Automatic Dosage Control of Additives device, system promptly begins to move on request.Behind the operation 168h (the tentative one-period time is 7 days), supplementing water flow integrating instrument shows that the accumulative total amount of makeup water is 28560m
3, the sewer flow integrator shows that the accumulative total water amount of blowdown is 5040m
3Through anatomizing, actual cycles of concentration is 4.47 times.With above parameter substitution wind water amount of seepage computing formula:
Actual wind water amount of seepage=(28560 ÷ 4.47-5040) ÷ 168=8.03m
3/ h
Actual evaporated water=(28560-5040-(8 * 168)) ÷ 168=132m
3/ h
Actual row sewage quantity=5040 ÷ 168=30m
3/ h
Actual amount of makeup water=28560 ÷ 168=170m
3/ h
With 5 times of cycles of concentration and wind water amount of seepage 8m
3These two parameter input automatons of/h, system promptly begins by new parameter control operation.Through the calculating and the adjustment in a plurality of cycles, the calculated value and the actual value of wind water amount of seepage will be very approaching, and cycles of concentration will be controlled very accurately.Because the changing value of wind water amount of seepage is generally all very little, so the control of cycles of concentration will be very steady.
Drug concentration balance control method implementation method.
On the basis of cycles of concentration balance control, the control of the balance of drug concentration is just than being easier to.The concrete operations step is: 1, equipment goes to toward the cold operation that a short time is arranged in normal operation after cleaning pre-film, at this moment should carry out dosing first.Because the water of system is without the fresh water that concentrates, to compare with the recirculated water after concentrating, calcium ion content is low, and pH value is not high, and corrosivity is eager to excel.So the prescription of dosing first should be distinguished to some extent with the reagent combination of recirculated water.Must select prescription meticulously according to water quality before adding medicament, and through determining the water treatment scheme of prescription and adding consistency after the dynamic analog test repeated screening again.Dosing first should once add according to the scheme of determining.Add dose=100VC first
1/ 1000S=VC
1/ 10S kg
V-system volume in the formula, m
3
C
1Drug concentration in the fresh water of-scheme regulation, mg/L;
The purity of S-commodity medicament.
The drug concentration of the recirculated water that requires according to scheme calculates the content of dispersion numerical value of supplementing water:
Supplementing water content of dispersion=recirculated water content of dispersion ÷ N (mg/L) (active ingredient meter).
In the formula, N---recirculated water cycles of concentration.
2, calculate the dose that adds of every cubic metre of supplementing water according to the content of dispersion of supplementing water:
Purity (the g/m of the content of dispersion ÷ medicament that adds dose=supplementing water of every cubic metre of supplementing water
3).
3, the dosing numerical quantity of every cubic metre of supplementing water that step 2 is drawn input medicament balance control device makes recirculating cooling water system implement the proportion expression dosing by the supplementing water flow.
Notion and implementation step for the drug concentration balance control method more clearly is described now provide embodiment 2.
The system volume of certain circulation is 2562m
3, cycles of concentration is controlled to be 5 times through balance control method.Requiring the prescription medicament concentration of dosing first through the definite water treatment scheme of experiment sieving is 12mg/L, and commercially available medicine purity is 35%; The drug concentration of control step cycle water prescription is 16mg/L, and commercially available medicine purity is 30%, requires to carry out control automatically.
1, related parameter substitution dosing calculating formula first will be arranged:
Add dose=2562 * 12 ÷ (10 * 35)=87.84kg first
Adding dose in the formula first answers in the disposable adding collecting-tank water.
To have in the related parameter substitution supplementing water content of dispersion calculating formula:
Supplementing water content of dispersion=16 ÷ 5=3.2 (mg/L) (active ingredient meter).
What 2, every cubic metre of supplementing water of related parameter substitution will be arranged adds the dose computing formula:
Every cubic metre of supplementing water add dose=3.2 * 100 ÷ 30=10.67 (g/m
3).
3, with 10.67 (g/m
3) input medicament balance control device, system promptly implements the proportion expression dosing by the supplementing water flow.
Because system is the salt balance by the salt content ÷ N of the salt content=recirculated water of supplementing water to be concerned and controls cycles of concentration, as long as so make the content of dispersion ÷ N of the content of dispersion=recirculated water of supplementing water, the dose that replenishes the system that enters must equate with the dose of wall losses that with system this has just kept the dose balance of system.
Claims (3)
1, a kind of open industrial circulating-cooling water concentrating ratio balance control method is characterized in that: it has two kinds of control methods that industrial circulating-cooling water concentrating ratio is controlled;
Cycles of concentration balance control method first method is divided realization and is controlled two stages the cycles of concentration of industrial circulating cooling water is controlled, and wherein the operating procedure of cycles of concentration implementation phase is:
(1) determines target cycles of concentration N;
(2) collecting-tank to the open type industrial circulating cooling water system injects fresh water, by flowmeter injected water volume is accurately measured, and confirms system volume V;
(3) under not heat exchange of heat exchanger situation, the water circulating pump in the affirmation recirculating cooling water system is at the oepration at full load state, thereby the liquid level of inciting somebody to action water in collecting-tank this moment is chosen to be the standard liquid level that the recirculating cooling water system water yield is controlled;
(4) make the heat exchanger in the recirculating cooling water system enter the heat exchange state,, under the situation of not carrying out blowdown, control amount of makeup water, the system volume V of recirculated cooling water is remained unchanged according to selected standard liquid level;
(5) by the flow integrator in the recirculating cooling water system amount of makeup water is added up, when accumulative total amount of makeup water=system volume V * (N-1), confirm that target cycles of concentration N realizes, enters the cycles of concentration control stage;
The operating procedure in cycles of concentration control stage is:
(1) controls the size of amount of makeup water according to the variation of the standard liquid level in the collecting-tank, and the size of amount of makeup water is monitored and add up by instrument;
(2) the amount of makeup water numerical value that records according to instrument and with itself and target cycles of concentration N, wind water amount of seepage numerical value substitution blowdown control water yield computing formula together,
The blowdown control water yield=amount of makeup water ÷ N-wind water amount of seepage
Make water amount of blowdown synchronous operation under amount of makeup water control;
The operating procedure of cycles of concentration balance control method second method is:
(1) determines target cycles of concentration N;
(2) collecting-tank to the open type industrial circulating cooling water system injects fresh water, by flowmeter injected water volume is accurately measured, and confirms system volume V;
(3) under not heat exchange of heat exchanger situation, the water circulating pump in the affirmation recirculating cooling water system is at the oepration at full load state, thereby the liquid level of inciting somebody to action water in collecting-tank this moment is chosen to be the standard liquid level that the recirculating cooling water system water yield is controlled;
(4) make the heat exchanger in the recirculating cooling water system enter the heat exchange state, according to the operating procedure in cycles of concentration control stage in the first method amount of makeup water and water amount of blowdown are controlled immediately, make system slowly realize target cycles of concentration N automatically, finally control by the target cycles of concentration N that realizes.
2, industrial circulating-cooling water concentrating ratio balance control method according to claim 1, it is characterized in that: the wind water amount of seepage is according to formula
Wind water amount of seepage=(the actual cycles of concentration of accumulative total amount of makeup water ÷-accumulative total water amount of blowdown) ÷ hours of operation draws, wherein add up the accumulative total amount of makeup water that amount of makeup water is meant supplementing water flow integrating instrument record, the accumulative total water amount of blowdown is meant the accumulative total water amount of blowdown of blowdown flow integrating instrument record, actual cycles of concentration is meant the actual cycles of concentration that the one-period end is analyzed out, and the time standard of one-period is: accumulative total water amount of blowdown 〉=system volume V needed running time.
3, a kind of open type industrial circulating cooling water drug concentration balance control method is characterized in that: this drug concentration balance control method carries out on the basis of cycles of concentration balance control, and its operating procedure is:
(1) calculate the content of dispersion numerical value of supplementing water according to the content of dispersion of the desired recirculated water of water treatment scheme according to formula:
Supplementing water content of dispersion=recirculated water content of dispersion ÷ N
(2) the content of dispersion numerical computations of the supplementing water that draws according to medicament effective ingredient percentage composition and step (1) goes out the dosing numerical quantity of every cubic metre of supplementing water:
Every cubic metre of supplementing water adds the content of dispersion ÷ medicament effective ingredient percentage composition (g/m of dose=supplementing water
3);
(3) the every cubic metre of supplementing water dosing numerical quantity that draws according to amount of makeup water and step (2) carries out the proportion expression dosing in proportion in recirculating cooling water system.
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