CN103307928B - The control method of open type circulating water cooling system - Google Patents
The control method of open type circulating water cooling system Download PDFInfo
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Abstract
The invention provides the control method of a kind of open type circulating water cooling system, comprise the following steps: step S10: obtain the quantity of circulating water in the cooling tower flowing into open type circulating water cooling system; Step S20: determine the evaporation loss of cooling tower according to quantity of circulating water; Step S30: determine blowdown flow rate and the rate of water make-up of open type circulating water cooling system according to the cycles of concentration of regulation and evaporation loss; Step S40: according to blowdown flow rate, open type circulating water cooling system carried out blowdown and according to rate of water make-up, open type circulating water cooling system carried out moisturizing. The control method of the open type circulating water cooling system of the present invention can save water source and guarantee flows through the ion concentration of recirculated water of heat exchanger less than higher limit.
Description
Technical field
The present invention relates to circulating water technical field, in particular to the control method of a kind of open type circulating water cooling system.
Background technology
At present, open type circulating water cooling system includes the heat exchanger in production process, water circulating pump and cooling tower (may also be cooling bay). Recirculated water is at the flows by action of water circulating pump through heat exchanger, and heat exchanger carries out heat exchange, thus reducing the temperature of heat exchanger. Circulating water flow temperature after heat exchanger raises, then recirculated water is flowed into from the water inlet of cooling tower, recirculated water is cooled down by cooling tower, and the recirculated water after cooling flows out from cooling tower outlet and flows through heat exchanger, constantly repeats said process and then heat exchanger carries out lasting cooling operations.
Generally, in open type circulating water cooling system, recirculated water is cooled down by the mode being substantially carried out evaporative heat loss at cooling tower due to recirculated water, and therefore the recirculated water in open type circulating water cooling system is constantly evaporated, and the recirculated water in cooling system can be fewer and feweri. For making the water yield of the recirculated water in cooling system be basically unchanged, it is necessary to constantly cooling system is supplemented fresh water (such as tap water). Also containing various mineral and each ion in the fresh water supplemented, various mineral and each ion concentration in recirculated water will be more and more denseer. In order to prevent ion from exceeding standard, cooling system is produced serious corrosion or scale formation, it is to avoid owing to corrosion causes heat exchanger leakage, or affect heat-transfer effect due to fouling, it is necessary to from cooling system, discharge part recirculated water and additionally supplement fresh water.Owing to the ion concentration of supplementary fresh water is lower than the ion concentration of recirculated water discharged, say, that the ion concentration of the recirculated water in cooling system reduces, and in cooling system the water yield of recirculated water without minimizing.
At present, different regions are using different ions as recirculated water key index, and the higher limit of each key index also differs. By the ion concentration in the higher limit of key index and supplementary fresh water specifies the cycles of concentration (ion concentration in such as ion concentration higher limit/supplementary fresh water) of this area, and the water yield that the overall water yield supplementing fresh water is equal to cycles of concentration and discharge recirculated water is long-pending. Such as, when somewhere is with salinity for key index, when the salinity in recirculated water meets or exceeds upper concentration, it is necessary for discharging a part of recirculated water, and then discharge a large amount of salinity, extra supplementary fresh water on the basis of former amount of makeup water, reduces the purpose of ion concentration simultaneously. For making the water yield of the recirculated water in cooling system be basically unchanged, the extra water yield supplemented is identical with the water yield of discharge.
In prior art, the ion concentration of recirculated water in cooling system is carried out regular mensuration to carry out blowdown and the operation of extra moisturizing by staff. Ionic species owing to measuring is relatively more, measure time long, cause that worker workload is relatively larger, when staff determine certain ion concentration exceed standard time, when the recirculated water that this ion concentration exceeds standard runs many in a cooling system, system equipment is caused infringement. Degree that staff exceeds standard according to ion concentration and the discharge water yield of empirically determined recirculated water, owing to different staff can determine whether the output of different recirculated water, cause that the water yield of the extra fresh water supplemented also can be different. If the output of the recirculated water discharged, is few, it is impossible to ion concentration is reduced to below higher limit; If the output of the recirculated water discharged is many, and then the extra fresh water supplemented increases therewith, wastes water source.
Summary of the invention
Water source can be saved and guarantee flows through the ion concentration of recirculated water of heat exchanger less than the control method of the open type circulating water cooling system of higher limit it is desirable to provide a kind of.
To achieve these goals, according to an aspect of the invention, it is provided the control method of a kind of open type circulating water cooling system, comprise the following steps: step S10: obtain the quantity of circulating water in the cooling tower flowing into open type circulating water cooling system; Step S20: determine the evaporation loss of cooling tower according to quantity of circulating water; Step S30: determine blowdown flow rate and the rate of water make-up of open type circulating water cooling system according to the cycles of concentration of regulation and evaporation loss; Step S40: according to blowdown flow rate, open type circulating water cooling system carried out blowdown and according to rate of water make-up, open type circulating water cooling system carried out moisturizing.
Further, evaporation loss is determined by below equation:
E=k����t��Qm
Wherein, E is evaporation loss, and k is the evaporation coefficient of open type circulating water cooling system, and �� t is the recirculated water of open type circulating water cooling system temperature gap of water inlet and water outlet in cooling tower, and Qm is quantity of circulating water.
Further, blowdown flow rate and rate of water make-up are determined by below equation:
M=K��D
M=E+D
Wherein, M is rate of water make-up, and E is evaporation loss, and D is blowdown flow rate, and K is cycles of concentration.
According to a further aspect in the invention, it is provided that the control method of another kind of open type circulating water cooling system, comprise the following steps: step S100: obtain the quantity of circulating water in the cooling tower flowing into open type circulating water cooling system;Step S200: determine the evaporation loss of cooling tower according to quantity of circulating water; Step S300: determine the windage loss water yield of open type circulating water cooling system according to quantity of circulating water; Step S400: determine blowdown flow rate and the rate of water make-up of recirculated water according to the cycles of concentration of regulation, evaporation loss and the windage loss water yield; Step S500: according to blowdown flow rate, open type circulating water cooling system carried out blowdown and according to rate of water make-up, open type circulating water cooling system carried out moisturizing.
Further, evaporation loss is determined by below equation:
E=k����t��Qm
Wherein, E is evaporation loss, and k is the evaporation coefficient of open type circulating water cooling system, and �� t is the recirculated water of open type circulating water cooling system temperature gap of water inlet and water outlet in cooling tower, and Qm is quantity of circulating water.
Further, the windage loss water yield is determined by below equation:
B=P��Qm
Wherein, B is the windage loss water yield, and P is the windage loss water yield coefficient of regulation, and Qm is quantity of circulating water.
Further, blowdown flow rate and rate of water make-up are determined by below equation:
M=K �� (D+B)
M=E+B+D
Wherein, M is rate of water make-up, and D is blowdown flow rate, and K is cycles of concentration, and B is the windage loss water yield, and E is evaporation loss.
Application technical scheme, fully take into account the key factor of blowdown flow rate and the rate of water make-up affecting open type circulating water cooling system: the cycles of concentration of evaporation loss and regulation, may determine that above-mentioned evaporation loss according to the quantity of circulating water in the cooling tower flowing into open type circulating water cooling system, namely cycles of concentration and above-mentioned evaporation loss further according to regulation can determine that blowdown flow rate and rate of water make-up. According to the blowdown flow rate determined and rate of water make-up, system is carried out moisturizing. The control method adopting the present invention can ensure that the cycles of concentration of the recirculated water flowing through heat exchanger maintains setting, and flows through the ion concentration value in the recirculated water of heat exchanger less than higher limit. Above-mentioned control method rule of thumb controls the water yield of draining without staff, it is to avoid circulating water cooling system carries out excessive draining and moisturizing, saves water source.
Accompanying drawing explanation
The Figure of description constituting the part of the application is used for providing a further understanding of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention. In the accompanying drawings:
Fig. 1 illustrates the schematic flow sheet of the embodiment one of the control method of the open type circulating water cooling system according to the present invention; And
Fig. 2 illustrates the schematic flow sheet of the embodiment two of the control method of the open type circulating water cooling system according to the present invention.
Detailed description of the invention
It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined. Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
As it is shown in figure 1, the control method of the open type circulating water cooling system of embodiment one comprises the following steps:
Step S10: obtain the quantity of circulating water in the cooling tower flowing into open type circulating water cooling system. The water yield of recirculated water in the cooling tower flowing into open type circulating water cooling system can be obtained by the following method:
First method, by arranging measurement instrument in the porch of cooling tower, to the quantity of circulating water measurement flowed in cooling tower, it is possible to obtain flowing into the quantity of circulating water in cooling tower.
Second method, it is assumed that with the heat exchanger of open type circulating water cooling system for starting point, the flow direction along recirculated water is disposed with cooling tower, water supplement port, collecting-tank and water pump, and collecting-tank is provided with water supplement port, and each parts are connected by pipeline.Recirculated water is when dispelling the heat to heat exchanger, and the water yield of recirculated water loss is negligible. The water yield extracting recirculated water from water pump out is essentially identical with the water yield of the recirculated water flowing into cooling tower, it is possible to by the power of water pump, obtains extracting out the water yield value of recirculated water from water pump, and then obtains flowing into the water yield value of the recirculated water in cooling tower. It is of course also possible to directly control the power of water pump, and then can control to flow into the water yield of the recirculated water in cooling tower.
Step S20: determine the evaporation loss of cooling tower according to quantity of circulating water. Above-mentioned evaporation loss can be determined by below equation:
E=k �� �� t �� Qm formula (1)
Wherein, E is evaporation loss, and k is the evaporation coefficient of open type circulating water cooling system, and �� t is the recirculated water of open type circulating water cooling system temperature gap of water inlet and water outlet in cooling tower, and Qm is quantity of circulating water. In cooling tower, water inlet and water outlet thermometer can be set to obtain the temperature value of water inlet and water outlet in cooling tower, and then the difference of the temperature value of two can be obtained. Thermometer can be set to measure the temperature value of the air of the cooling tower of open type circulating water cooling system, the evaporation coefficient corresponding with the temperature value of above-mentioned air can be obtained by the GB/T50050 that tables look-up.
The quantity of circulating water flowed out in cooling tower by arranging measurement instrument in the porch of cooling tower, can also be measured by evaporation loss. The water yield difference flowing into the recirculated water in cooling tower and the recirculated water in outflow cooling tower is similar to evaporation loss.
Step S30: determine blowdown flow rate and the rate of water make-up of open type circulating water cooling system according to the cycles of concentration of regulation and evaporation loss. The cycles of concentration of above-mentioned regulation can be the cycles of concentration that circulating water cooling system location specifies, it is also possible to be the cycles of concentration that specifies of circulating water cooling system place enterprise. Blowdown flow rate and rate of water make-up is determined by below equation:
M=K �� D formula (2)
M=E+D formula (3)
Wherein, M is rate of water make-up, and E is evaporation loss, and D is blowdown flow rate, and K is cycles of concentration. By above-mentioned formula simultaneous, it is possible to obtain below equation:
D=E/(K-1)
M=EK/(K-1)
Under the premise determining evaporation loss E and cycles of concentration K, it is possible to determine blowdown flow rate D and rate of water make-up M according to the formula that formula (2) and formula (3) simultaneous obtain.
Step S40: according to blowdown flow rate, open type circulating water cooling system carried out blowdown and according to rate of water make-up, open type circulating water cooling system carried out moisturizing. By the discharge of the numerical control open type circulating water cooling system sewage draining exit of rate of water make-up and blowdown flow rate and water supplement port, to realize circulating water cooling system is carried out draining and moisturizing simultaneously.
The control method of embodiment one fully takes into account the key factor of blowdown flow rate and the rate of water make-up affecting open type circulating water cooling system: the cycles of concentration of evaporation loss and regulation, may determine that above-mentioned evaporation loss according to the quantity of circulating water in the cooling tower flowing into open type circulating water cooling system, namely cycles of concentration and above-mentioned evaporation loss further according to regulation can determine that blowdown flow rate and rate of water make-up. According to the blowdown flow rate determined and rate of water make-up, system is carried out moisturizing. Can ensure that the cycles of concentration of the recirculated water flowing through heat exchanger maintains predetermined value by above-mentioned control method, and flow through the ion concentration value in the recirculated water of heat exchanger all less than the higher limit of regulation. Above-mentioned control method rule of thumb controls the water yield of draining without staff, it is to avoid circulating water cooling system carries out excessive draining and moisturizing, saves water source.
Above-mentioned control method can be realized by manual type or realize by controlling device. When by controlling device and realizing, it is necessary to by the quantity of circulating water in the cooling tower of the inflows open type circulating water cooling system obtained, the cycles of concentration of regulation numerical value and blowdown flow rate and rate of water make-up and quantity of circulating water and cycles of concentration between functional relationship be input to and control in device. Control device through calculating blowdown flow rate and rate of water make-up, according to above-mentioned blowdown flow rate and rate of water make-up, open type circulating water cooling system carried out blowdown and moisturizing.
As in figure 2 it is shown, the embodiment two according to the control method of the open type circulating water cooling system of the present invention comprises the following steps:
Step S100: obtain the quantity of circulating water in the cooling tower flowing into open type circulating water cooling system. The method obtaining quantity of circulating water in step S100 is essentially identical with the method for embodiment one, does not repeat them here.
Step S200: determine the evaporation loss of cooling tower according to quantity of circulating water. The method obtaining evaporation loss in step S200 is essentially identical with the method for embodiment one, does not repeat them here.
Step S300: determine the windage loss water yield of open type circulating water cooling system according to quantity of circulating water. The windage loss water yield is determined by below equation:
B=P �� Qm formula (4)
Wherein, B is the windage loss water yield, and P is the windage loss water yield coefficient of regulation, and Qm is quantity of circulating water. It is 0.05 by the known windage loss water yield coefficient of GB/T50102-2003.
Step S400: determine blowdown flow rate and the rate of water make-up of recirculated water according to the cycles of concentration of regulation, above-mentioned evaporation loss and the windage loss water yield. Blowdown flow rate and rate of water make-up is determined by below equation:
M=K �� (D+B) formula (5)
M=E+B+D formula (6)
Wherein, M is rate of water make-up, and D is blowdown flow rate, and K is cycles of concentration, and B is the windage loss water yield, and E is evaporation loss. By above-mentioned formula (5) and formula (6) simultaneous, it is possible to obtain below equation:
D=[E+ (1-K) �� B]/(K-1) formula (7)
M=EK/ (K-1) formula (8)
Under the premise determining evaporation loss E, cycles of concentration K and windage loss water yield B, it is possible to determine blowdown flow rate D and rate of water make-up M according to the formula that formula (5) and formula (6) simultaneous obtain.
Step S500: according to blowdown flow rate, open type circulating water cooling system carried out blowdown and according to rate of water make-up, open type circulating water cooling system carried out moisturizing. By the discharge of the numerical control open type circulating water cooling system sewage draining exit of rate of water make-up and blowdown flow rate and water supplement port, to realize circulating water cooling system is carried out draining and moisturizing simultaneously.
Embodiment two and embodiment one are distinctive in that, embodiment two considers the open type circulating water cooling system windage loss water yield on the basis of embodiment one. The windage loss water yield mainly includes splashing to the water yield outside circulating water cooling system.
The control method adopting embodiment two is controlled, and is exemplified below:
The quantity of circulating water flowed in the cooling tower of open type circulating water cooling system is 101254.2(t/h). The cycles of concentration that circulating water cooling system location specifies is 5.0. The temperature of the recirculated water flowing into cooling tower is 20(DEG C), the temperature of the recirculated water flowing out cooling tower is 11.5(DEG C). The dry-bulb temperature correspondence evaporation coefficient of the air of cooling tower is 0.14. The setting of cycles of concentration is 5.0. Adopt the control method of embodiment two:
Calculate evaporation loss by formula (1) can obtain: E=k �� �� t �� Qm=0.14 �� 8.25 �� 101254.2=1170(t/h)
Calculate the windage loss water yield by formula (4) can obtain: B=P �� Qm=0.05 �� 101254.2=50.6(t/h)
Calculate blowdown flow rate by formula (7) can obtain:
D=[E+(1-K)��B]/(K-1)=[1170+(1-5)��50.6]/(5-1)=242(t/h)
Calculate rate of water make-up by formula (8) can obtain: M=EK/ (K-1)=1170 �� 5 �� 4=1462.5 (t/h)
It is of course also possible to calculate rate of water make-up by formula (5) or formula (6), the numerical value of the windage loss water yield obtained due to formula (4) is only accurate to one decimal place, and the rate of water make-up that formula (8) and formula (6) draw has slight error.The numerical value of the blowdown flow rate obtained due to formula (7) is only accurate to integer-bit, and the rate of water make-up that formula (8) and formula (5) draw has slight error.
Owing to the recirculated water of open type circulating water cooling system also includes otherwise flowing out circulating water cooling system, for instance pipe leakage etc. Also having slight error when measuring each initial data, above-mentioned situation all can cause the change of the overall water yield in circulating water cooling system, and the numerical value that above-mentioned formula calculates is more accurate, and in circulating water cooling system, the change of the overall water yield is more slow, it might even be possible to ignore. When staff finds that the water level in collecting-tank substantially reduces or the quantity of circulating water flowing in cooling tower significantly reduces, it is possible to additionally cooling system is carried out moisturizing, so that the water level in collecting-tank returns to original position or quantity of circulating water returns to original value measured. The rainwater extraneous due to circulating water cooling system can flow in cooling tower, and then adds the water level raising in the quantity of circulating water and collecting-tank that flow in and out in cooling tower, it is possible to the extraction section water yield or minimizing rate of water make-up from collecting-tank.
Being respectively adopted the control method of original method and embodiment one to carry out open type circulating water cooling system mending draining, specific experiment data are as follows: for total blowdown flow rate at certain month of water factory that quantity of circulating water per hour is 10.5 ten thousand tons. Certain month adopts original benefit water discharge method: total blowdown flow rate of on-the-spot blowdown flow meter statistics is 254160m3; By adopting the control method of embodiment one: total blowdown flow rate of on-the-spot blowdown flow meter statistics is 186744m3. By contrasting above-mentioned experimental data it can be concluded that the water consumption of open type circulating water cooling system can effectively be reduced, save moisturizing and charges for disposing pollutants are used.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (5)
1. the control method of an open type circulating water cooling system, it is characterised in that comprise the following steps:
Step S10: obtain the quantity of circulating water in the cooling tower flowing into open type circulating water cooling system, wherein, with the heat exchanger of described open type circulating water cooling system for starting point, flow direction along recirculated water is disposed with cooling tower, water supplement port, collecting-tank and water pump, described collecting-tank is provided with described water supplement port, described recirculated water is when dispelling the heat to described heat exchanger, obtain extracting out the water yield value of recirculated water from described water pump by the power of described water pump, and then obtain flowing into the water yield value of the recirculated water in described cooling tower;
Step S20: determine the evaporation loss of described cooling tower according to described quantity of circulating water, described evaporation loss is determined: E=k �� �� t �� Qm by below equation, wherein, described E is described evaporation loss, described k is the evaporation coefficient of described open type circulating water cooling system, described �� t is the recirculated water of described open type circulating water cooling system temperature gap of water inlet and water outlet in described cooling tower, and described Qm is described quantity of circulating water;
Step S30: determine blowdown flow rate and the rate of water make-up of described open type circulating water cooling system according to the cycles of concentration of regulation and described evaporation loss;
Step S40: according to described blowdown flow rate, described open type circulating water cooling system carried out blowdown and according to described rate of water make-up, described open type circulating water cooling system carried out moisturizing.
2. control method according to claim 1, it is characterised in that determined described blowdown flow rate and described rate of water make-up by below equation:
M=K �� D
M=E+D
Wherein, described M is described rate of water make-up, and described E is described evaporation loss, and D is described blowdown flow rate, and K is described cycles of concentration.
3. the control method of an open type circulating water cooling system, it is characterised in that comprise the following steps:
Step S100: obtain the quantity of circulating water in the cooling tower flowing into open type circulating water cooling system;
Step S200: determine the evaporation loss of described cooling tower according to described quantity of circulating water, described evaporation loss is determined: E=k �� �� t �� Qm by below equation, wherein, described E is described evaporation loss, described k is the evaporation coefficient of described open type circulating water cooling system, described �� t is the recirculated water of described open type circulating water cooling system temperature gap of water inlet and water outlet in described cooling tower, and described Qm is described quantity of circulating water;
Step S300: determine the windage loss water yield of described open type circulating water cooling system according to described quantity of circulating water;
Step S400: determine blowdown flow rate and the rate of water make-up of recirculated water according to the cycles of concentration of regulation, described evaporation loss and the described windage loss water yield;
Step S500: according to described blowdown flow rate, described open type circulating water cooling system carried out blowdown and according to described rate of water make-up, described open type circulating water cooling system carried out moisturizing.
4. control method according to claim 3, it is characterised in that determine the described windage loss water yield by below equation:
B=P �� Qm
Wherein, described B is the described windage loss water yield, and described P is the windage loss water yield coefficient of regulation, and described Qm is described quantity of circulating water.
5. control method according to claim 4, it is characterised in that determined described blowdown flow rate and described rate of water make-up by below equation:
M=K �� (D+B)
M=E+B+D
Wherein, described M is described rate of water make-up, and described D is described blowdown flow rate, and described K is described cycles of concentration, and described B is the described windage loss water yield, and described E is described evaporation loss.
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| CN104571164B (en) * | 2014-12-22 | 2017-05-17 | 北京时代源泉科技有限公司 | Online concentration multiple control method and device |
| CN106091797B (en) * | 2016-06-21 | 2018-09-14 | 中国神华能源股份有限公司 | Large capacity circulating cooling water tower mends water discharge method and system |
| IT201600110609A1 (en) * | 2016-11-03 | 2018-05-03 | Seko Spa | METHOD AND ADJUSTMENT SYSTEM IN A COOLING TOWER |
| CN109521813B (en) * | 2018-11-13 | 2023-08-29 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | System and method for stably controlling concentration ratio of circulating water of thermal power plant |
| CN109931801B (en) * | 2019-03-26 | 2024-03-26 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Automatic water supplementing system and water supplementing method for circulating cooling water tower pool of thermal power plant |
| CN111618103A (en) * | 2020-05-29 | 2020-09-04 | 鞍钢股份有限公司 | Method for determining leakage rate of circulating water cooling system through temperature concentration rate |
| CN111666670B (en) * | 2020-05-29 | 2023-05-16 | 鞍钢股份有限公司 | Method for determining water supplementing rate of circulating system through concentration multiplying power when impurities are removed |
| CN111918522A (en) * | 2020-06-19 | 2020-11-10 | 南方电网科学研究院有限责任公司 | Converter station cooling system |
| CN113932395A (en) * | 2020-06-29 | 2022-01-14 | 中国移动通信集团浙江有限公司 | Antiscaling method and equipment for wet film humidifier |
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