CN103193287A - Method and equipment for exhausting air in water circulation system - Google Patents
Method and equipment for exhausting air in water circulation system Download PDFInfo
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- CN103193287A CN103193287A CN2013101470601A CN201310147060A CN103193287A CN 103193287 A CN103193287 A CN 103193287A CN 2013101470601 A CN2013101470601 A CN 2013101470601A CN 201310147060 A CN201310147060 A CN 201310147060A CN 103193287 A CN103193287 A CN 103193287A
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Abstract
The invention provides a method and equipment for exhausting air in a water circulation system. A dynamic control system is arranged in the water circulation system and used for controlling the pressure of water, an automatic air exhausting valve is arranged on a high-point position in which a pipeline of the system returns downwards after rising, and meanwhile, the flow velocity of water in the system is reduced, so that the water-carrying capacity of the system just meets the water flow requirement of a main engine; and air accumulated in the pipeline in the water circulation system is exhausted by changing the water pressure in the pipeline. The method and equipment provided by the invention can be used for effectively exhausting air in the pipeline, reducing the system resistance of the pipeline, reducing the system energy consumption, prolonging the service life of the pipeline and improving the using effect of an air conditioner; and meanwhile, the equipment is low in investment cost, reduced in cost, simple to install, convenient to operate and safe and practical.
Description
Technical field
The present invention relates to method for removing and the equipment of air in a kind of water circulation system.
Background technology
Current, the water circulation system that relates to heat exchange is widely used in each production field of industry, the hydrologic cycle cooling system of using as industrial production such as film, pharmacy, metallurgy, also have hotel, market, enterprises and institutions' central air conditioner system, usually by refrigeration host computer heat exchanger, water trap, equipment heat exchanger, water collector, water circulating pump, connect into refrigeration system by many pipelines, valve, the expansion tank that floating ball valve of rehydration is housed generally is placed on highest point, utilizes water gravity to system's water filling.Though pipeline is equipped with vent valve at the main riser highest point, system pipeline elbow, joint, fan coil top, gangway still have many air to exist in the downward transverse tube top.In addition, the air that dissolves in the water also can separate out when water temperature raises, and gathers and stays the system pipeline top, forms local blank pipe.
The existence of air makes system many bad phenomenon even fault occur, as:
1, occurs the gurgle underwater sound in the pipeline, environment is had the certain noise influence;
2, cause the accelerated corrosion of iron and steel parts in the system (pipeline), steel corrosion speed is several times of general normal system in the long-term system that is detained of air;
3, the pressure dome of holding back causes heat radiation not hold or the loss of total system thermal load;
4, the water pump rotation produces the spiral water body, and the air in the transverse tube is sucked pump head, because the mixture of water and air can be compressed, water pump can't transmit feedwater to mechanical energy effectively, greatly reduce discharge;
5, be dissolved in gas in the liquid, when pressure, temperature variation, also can discharge, form steam void.When liquid internal pressure descends, when being lower than the saturated vapor pressure of liquid under this temperature, form steam bubble or steam void at regional area; And crushed by pressure all around suddenly at the local steam bubble that pressure raises, liquid stream pushes to the center of steam bubble with high speed because of inertia, and equipment is caused water impact.The generation of this microvesicle, debacle and the whole process that wetted surfaces produces physics and chemical action is called cavitation.Occur in the water pump impeller place of high speed rotating especially easily, cause pump efficiency to descend;
6, pipeline full packages not is equivalent to reduce pipe diameter, has increased the resistance of ducting;
7, form the vapour lock blank pipe, water pump can't be sent to fan coil to water, causes local room do not freeze (heating);
8, vent valve is taken away the arrival standpipe with current at the main riser highest point in order to make the air of holding back in the system as far as possible, all selects high flow rate, high-lift pump when designing usually.Often actual flow surpasses refrigerator and needs 20% of flow, even more than one times, causes the serious waste of pump motor power like this.The benefit that flow velocity is high is and can be transported to standpipe to the air of system's far-end with current, discharges by the automatic exhaust steam valve on standpipe top; But harm is the speed under the current direction of high flow rate is higher than the speed that bubble rises, and bubble can't separate and be taken back system by current, in the fan coil of far-end or be present in the pipeline of bottom and form static air bag.
In order to solve above-mentioned technical barrier, the technician has developed many corresponding technology both at home and abroad, as uses a large amount of vent valves manually or automatically to be installed in pipeline eminence, scatterer drift angle etc.Chinese patent file CN1180208C discloses the method for removing of air in the cold and hot matchmaker's water system of a kind of central air-conditioning, utilize water collector as air separation plant, air collector and vent valve are installed in the above, with the chilled water flow velocity that is not less than 0.4m/s, take the water collector that air in the standpipe moves downward the machine room lowest part to, outside air collector and vent valve discharge system.
But in actual applications, no matter still strengthen flow velocity by the standard flow rate design, or many drain taps are installed, all can not be solved the still air bag problem that in pipeline, forms fully.
Summary of the invention
The present invention is directed to above-mentioned shortcoming and problem, the method for removing of air in a kind of water circulation system is provided.
For achieving the above object, the present invention takes following technical proposals to realize:
The method for removing of air in the water circulation system, be to control the pressure of water by kinetic control system is set in water circulation system, and at the downward height point position installation automatic exhaust steam valve of system pipeline rising back answer, reduce the flow velocity of system water simultaneously, make the discharge of system satisfy the current requirement of main frame just, by changing ducted hydraulic pressure, get rid of the air of assembling in the pipeline in the water circulation system, described method comprises following concrete steps:
When a. the pressure of kinetic control system control water raise, air was soluble in water, with current away from original habitat;
When b. the pressure of kinetic control system control water reduced then, air soluble in water separated release from water, gathered when a certain amount of in conduit upper, outside the automatic exhaust steam valve removal system.
Further, described kinetic control system comprises time controller and pipe pressurizing balance pump, described pipe pressurizing balance pump is installed in the filling pipe place of system pipeline, and time controller is controlled the startup of pipe pressurizing balance pump automatically by the time scale that configures and stopped.
As another embodiment of the present invention, described kinetic control system comprises pressure controller and pipe pressurizing balance pump, described pipe pressurizing balance pump is installed in the filling pipe place of system pipeline, and pressure controller is controlled the startup of pipe pressurizing balance pump automatically by the pressure that configures and stopped.
Further, described pipe pressurizing balance pump is low power in-line pump.
Further, reduce lift by changing low power water circulating pump, thereby realize reducing the flow velocity of system water.
Be the purpose of the flow velocity of realizing above-mentioned reduction system water, the present invention can also realize reducing the flow velocity of system water by the running frequency that frequency conversion equipment reduces water circulating pump is installed at the water circulating pump place.
Further, when the pipe pressurizing balance pump was opened, system pressure was higher than static pressure according to claim 5 or 6 described 0.05-0.2MPa.
The present invention is according to the method for removing of air in the above-mentioned water circulation system, designed the wherein a kind of equipment that can get rid of air in the water circulation system, comprise the main frame vaporizer, water trap, water collector, water circulating pump, fan coil, expansion tank, expansion tank float(ing)valve and system's connecting tube, and the automatic exhaust steam valve that the main riser vertex is installed, also comprise kinetic control system and be installed in the automatic exhaust steam valve of replying downward place, height point position after system pipeline raises.
Further, the present invention has provided two kinds of implementations of described kinetic control system, and first kind of scheme, described kinetic control system comprise time controller and pipe pressurizing balance pump.
Another kind of scheme, described kinetic control system comprises pressure controller and pipe pressurizing balance pump.
The method of the excluding air that the present invention adopts is to realize on the basis of dynamic compensation principle, and described dynamic compensation principle is to utilize under different water temperatures and pressure the characteristic that the gas dissolving amount is different.Air belongs to indissoluble gases for water, because the rate of mass transfer of air in water controlled by liquid-film resistance, the rate of mass transfer of air can be expressed as:
N=KL(C*-C)=KLΔC；
N is the air rate of mass transfer in the formula, kg/m
2H;
KL is the liquid phase overall mass transfer coefficient, m
3/ m
2H;
C* and C are respectively equilibrium concentration and the actual concentrations of air in water, kg/m
3
By following formula as seen; Under certain temperature and pressure when being definite value (be C*), improve gas dissolving speed, just must come the reducer film thickness and increase the liquid phase overall mass transfer coefficient by the flow velocity and the water body turbulent fluctuation degree that increase water.And certain in water temperature, under the not really high condition of dissolved-air pressure, the dissolution equilibrium of air in water can be expressed as with Henry's law: V=KTp,
V is the solubleness of air in water in the formula, L/m
3
KT is solubility coefficient, L/kPam
3
P is the air balance dividing potential drop (absolute pressure) of solution top, kPa.
The relation of KT value and temperature is as follows:
The solubility coefficient of air in water under table 1 differing temps
| Temperature (0 ℃) | 0 | 10 | 20 | 30 | 40 | 50 |
| KT value (L/kPam3) | 0.285 | 0.218 | 0.180 | 0.158 | 0.135 | 0.120 |
As seen from the above table, the balance meltage of air in water is directly proportional with dissolved-air pressure, and relevant with temperature.
The per-cent of the air capacity that is dissolved in the water and bubbling air amount is called molten gas efficient.
Under the different dissolved-air pressures, actual meltage and the relation of dissolved air time of air in water is as follows:
The balance meltage of table 2 atmosphere air in water
| Temperature ( 0C) | 0 | 5 | 10 | 15 | 20 | 25 | 30 |
| Balance meltage (mg/L) | 37.55 | 32.48 | 28.37 | 25.09 | 22.40 | 20.16 | 18.14 |
| Balance meltage (mL/L) | 29.18 | 25.69 | 22.84 | 20.56 | 18.68 | 17.09 | 15.04 |
As from the foregoing, under differing temps and pressure, the maximum meltage difference of air in water.Such as, under the constant situation of absolute pressure, water being heated to 30 ℃ from 0 ℃, the air meltage drops to 15.04mL/L from 29.18 mL/L in the water, and this process water flask heating just back air is separated out the phenomenon that microvesicle is assembled Hu Bi from water.When opening the soda water bottle cap, bubble occurs immediately in the bottle again, and this is that pressure descends after opening bottle cap, and the gas dissolving amount descends rapidly in the water, and carbon dioxide dissolved gas discharges the phenomenon that forms bubble.
The present invention has used water different characteristic of quantity of dissolved gas under different pressures, by changing ducted hydraulic pressure, makes that remaining air incorporates in the water in the system when pressure raises, and takes away original habitat with current; When pressure reduces, from water, separate to discharge, gather when a certain amount of in conduit upper, outside automatic exhaust steam valve discharge system.And owing to when pressure boost or minimizing pressure, negative pressure does not all appear, so just can not enter system again outside the separated discharge of the air system in the system.By the process that constantly incorporates, takes away, discharges, discharges, the air bag of assembling in the pipeline can be got rid of fully, thoroughly solve the serial problem that the air that exists in the legacy system causes.
Compared with prior art, the present invention has the following advantages:
1, by increasing kinetic control system, changed the mode that traditional bubble takes away with the high flow rate current, become air dissolved in the water and take away, thereby realize becoming passive exhaust for the active exhaust, greatly improve exhaust effect, through facts have proved, except by the water-soluble micro-air of system, no longer include the air bag phenomenon in the pipeline and exist, pipeline is in the full packages state, thereby reduced the systemic resistance of pipeline greatly, lowered and send water consumption;
2, got rid of air, make air not for a long time gaseous-waste holdup system cause steel corrosion speed to increase, therefore prolonged pipeline life greatly;
3, eradicated the air water mixed flow, system's peace and quiet, the no gurgle underwater sound, and do not have cold and hot irregular phenomenon;
4, water pump can better effectively transmit mechanical energy, reduces energy loss;
5, be full of water in the water pump, the inner moisture film that forms, sealing is timely, thereby makes water pump obtain lubricated and cooling, and water pump is not fragile;
6, equipment input expense is low, and the cooling/warming systems of different sizes are suitable equally;
7, the installation of the method for exhausting of changes in temperature circulating water system of the present invention is simple, safe and practical, easy to operate, reduces debugging and operator's workload.
Description of drawings
Fig. 1 is water circulation system structural representation in the embodiment of the invention 1.
Embodiment
A kind of water circulation system structural representation of the embodiment of the invention 1 as shown in Figure 1, as can be seen from the figure, the equipment of air comprises main frame vaporizer 1 in the eliminating water circulation system of the present invention, water circulating pump 2, water trap 3, water collector 4, fan coil 5, the expansion tank 6 of floating ball valve of rehydration 7 is housed, be installed in the vent valve 8 of main riser highest point, connecting tube 9 is provided with kinetic control system in addition, comprise time controller 10 and pipe pressurizing balance pump 11, after pipeline raises, reply downward height point position installation automatic exhaust steam valve 12 simultaneously.Wherein expansion tank 6 generally is placed on uppermost storey, utilizes the gravity of water to system's water filling.
The vent valve 8 that is installed in the main riser highest point all can arrange in the general water circulation system, may be automatic exhaust steam valve, also may be manual exhaust valve.And in the present embodiment, get rid of automatically for the air that cooperates total system, vent valve 8 all is set to automatic exhaust steam valve.
In the present embodiment, pipe pressurizing balance pump 11 is low power in-line pump.Pipe pressurizing balance pump 11 is installed in the filling pipe place of the system pipeline that connects expansion tank 6, and time controller 10 is controlled the startup of pipe pressurizing balance pump 11 automatically by the time scale that configures and stopped.During 11 operations of pipe pressurizing balance pump, the hydraulic pressure in the expansion water supply tank 6 is gone into system pipeline, makes it pressure and raises.When hydraulic pressure raise, the air that stockpiles in the pipeline (as the air of gatherings such as numerous water pipe heads, fan coil top) was partly dissolved and takes away original place in the entry; When pipe pressurizing balance pump 11 stops, ducted hydraulic pressure is higher than the natural pressure of expansion tank 6, unnecessary water flows backwards through pipe pressurizing balance pump 11 and gets back to expansion tank 11, hydraulic pressure reduces in the pipeline, the air separation of dissolving in the entry, accumulate in the pipeline eminence, discharge system by automatic exhaust steam valve 8 and 12 places.
By taking above-mentioned measure, ducted air needs only system water and flows and air wherein can be taken away, and no longer relies on the current of high flow rate to take away, and therefore can reduce the flow velocity of water significantly, thus energy efficient.And the bubble of low flow velocity is easier separates from water, rises to the pipeline eminence and assembles, outside automatic exhaust steam valve 8 and 12 removal systems.
In the present embodiment, the flow velocity that reduces water can be accomplished in several ways, and method has two kinds preferably, and a kind of is the rotating speed that reduces water circulating pump 2, namely realizes by the running frequency that frequency conversion equipment reduction water circulating pump 2 is installed; Another kind is to change low power water circulating pump 2 to reduce lift.Above-mentioned two kinds of methods all can reduce system energy consumption, can select suitable scheme according to the needs of practical situation.
Basically identical among the structural representation of water circulation system and the embodiment 1 in the present embodiment, main difference is kinetic control system, employing be pressure controller and pipe pressurizing balance pump.Pressure controller is controlled the startup of pipe pressurizing balance pump automatically by certain pressure and is stopped.
The dynamic control that realizes pipeline pressure except the time controller that adopts among above-mentioned two embodiment and pressure controller among the present invention, can also select other kinetic control system according to actual needs, mainly satisfying dynamically, rising and the reduction of control pipeline pressure get final product.
Concrete application example
1, hotel, Yiwu technical scheme of the present invention not being installed when carrying out technological improvement, is equipped with 2 of York units, 3 on 45KW refrigerant water pump, 3 of 37KW cooling-water pumps.For energy-conservation, cooling has therein been installed frequency transformer additional with coolant circulating system, make the regular bad phenomenon of appearance air-conditioning result of use of floor in the 18th to 21 buildings, just at every turn all will be by artificial emptying gas, solve reluctantly after adding water.Optimization design by we technician, adopt dynamic compensation technology of the present invention, kinetic control system and automatic exhaust steam valve are installed, cooperate the transformation of optimum condition operating circulating water pump simultaneously, when water circulating pump installation power 11KW, just satisfied the air-conditioning result of use, the in-and-out phenomenon of air-conditioning is solved more than 18 layers simultaneously.
2, Zhejiang Yi Mei thin film industry Group Co.,Ltd, when not using the technology of the present invention method to transform, 8 of the chilled water pump motors of film line circulating water system installation 75KW, 4 in 1320KW main frame, 6 of 55KW cooling-water pumps.The actual use opened 4 refrigerant pumps, the workshop also have part position cold carry less than.And after using the present invention, cooperating the efficient pump transformation again, cooling has just been satisfied the production demand with the water circulating pump that refrigerant pump is all used 22KW instead.
Though the present invention with preferred embodiment openly as above; but it is not to limit the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made possible change and modification; therefore; every content that does not break away from technical solution of the present invention; to any simple modification, equivalent variations and modification that above embodiment does, all belong to the protection domain of technical solution of the present invention according to technical spirit of the present invention.
Claims (10)
1. the method for removing of air in the water circulation system, it is characterized in that, kinetic control system is set in water circulation system controls the pressure of water, and at the downward height point position installation automatic exhaust steam valve of system pipeline rising back answer, reduce the flow velocity of system water simultaneously, make the discharge of system satisfy the current requirement of main frame just, by changing ducted hydraulic pressure, get rid of the air of assembling in the pipeline in the water circulation system, described method comprises following concrete steps:
When a. the pressure of kinetic control system control water raise, air was soluble in water, with current away from original habitat;
When b. the pressure of kinetic control system control water reduced then, air soluble in water separated release from water, gathered when a certain amount of in conduit upper, outside the automatic exhaust steam valve removal system.
2. the method for removing of air in the water circulation system according to claim 1, it is characterized in that, described kinetic control system comprises time controller and pipe pressurizing balance pump, described pipe pressurizing balance pump is installed in the filling pipe place of system pipeline, and time controller is controlled the startup of pipe pressurizing balance pump automatically by the time scale that configures and stopped.
3. the method for removing of air in the water circulation system according to claim 1, it is characterized in that, described kinetic control system comprises pressure controller and pipe pressurizing balance pump, described pipe pressurizing balance pump is installed in the filling pipe place of system pipeline, and pressure controller is controlled the startup of pipe pressurizing balance pump automatically by the pressure that configures and stopped.
4. according to the method for removing of air in claim 2 or the 3 described water circulation systems, it is characterized in that described pipe pressurizing balance pump is low power in-line pump.
5. the method for removing of air in the water circulation system according to claim 4 is characterized in that, reduces lift by changing low power water circulating pump, thereby realizes reducing the flow velocity of system water.
6. the method for removing of air in the water circulation system according to claim 4 is characterized in that, the running frequency that frequency conversion equipment reduces water circulating pump is installed at the water circulating pump place, thereby realizes reducing the flow velocity of system water.
7. according to the method for removing of air in claim 5 or the 6 described water circulation systems, it is characterized in that when the pipe pressurizing balance pump was opened, system pressure was higher than static pressure 0.05-0.2MPa.
8. equipment of getting rid of air in the water circulation system, comprise the main frame heat exchanger, water trap, water collector, water circulating pump, the equipment heat exchanger, expansion tank, expansion tank float(ing)valve and system's connecting tube, and the automatic exhaust steam valve that the main riser vertex is installed, it is characterized in that, also comprise kinetic control system and be installed in the automatic exhaust steam valve of replying downward place, height point position after system pipeline raises.
9. the equipment of air in the eliminating water circulation system according to claim 8, it is characterized in that, described kinetic control system comprises time controller and pipe pressurizing balance pump, described pipe pressurizing balance pump is installed in the filling pipe place of system pipeline, and time controller is controlled the startup of pipe pressurizing balance pump automatically by the time scale that configures and stopped.
10. the equipment of air in the eliminating water circulation system according to claim 8, it is characterized in that, described kinetic control system comprises pressure controller and pipe pressurizing balance pump, described pipe pressurizing balance pump is installed in the filling pipe place of system pipeline, and pressure controller is controlled the startup of pipe pressurizing balance pump automatically by the pressure that configures and stopped.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310147060.1A CN103193287B (en) | 2013-04-25 | 2013-04-25 | Method and equipment for exhausting air in water circulation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310147060.1A CN103193287B (en) | 2013-04-25 | 2013-04-25 | Method and equipment for exhausting air in water circulation system |
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| CN103193287A true CN103193287A (en) | 2013-07-10 |
| CN103193287B CN103193287B (en) | 2015-03-18 |
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| CN201310147060.1A Expired - Fee Related CN103193287B (en) | 2013-04-25 | 2013-04-25 | Method and equipment for exhausting air in water circulation system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108441593A (en) * | 2018-02-13 | 2018-08-24 | 鞍钢股份有限公司 | Method for judging whether gas is accumulated according to water level graphic of closed water system |
| CN111075731A (en) * | 2019-11-29 | 2020-04-28 | 东莞道汇环保科技股份有限公司 | Water leakage prevention system for circulating water pump and control method thereof |
| CN114084927A (en) * | 2021-10-18 | 2022-02-25 | 江苏核电有限公司 | Equipment and method for deoxidizing cooling water of nuclear power plant equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047562A (en) * | 1990-03-09 | 1990-12-05 | 何积顺 | Micropressure boiler hot water heating system |
| CN1412495A (en) * | 2002-12-10 | 2003-04-23 | 蔡春余 | Method for exhausting air in cold-hot medium water system |
| CN201652606U (en) * | 2009-12-25 | 2010-11-24 | 杨美英 | Normal-pressure automatic constant pressure water-replenishing and gas-stripping device |
| CN202328472U (en) * | 2011-11-22 | 2012-07-11 | 孙建军 | Environment-friendly energy-saving full-automatic heating device |
-
2013
- 2013-04-25 CN CN201310147060.1A patent/CN103193287B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047562A (en) * | 1990-03-09 | 1990-12-05 | 何积顺 | Micropressure boiler hot water heating system |
| CN1412495A (en) * | 2002-12-10 | 2003-04-23 | 蔡春余 | Method for exhausting air in cold-hot medium water system |
| CN201652606U (en) * | 2009-12-25 | 2010-11-24 | 杨美英 | Normal-pressure automatic constant pressure water-replenishing and gas-stripping device |
| CN202328472U (en) * | 2011-11-22 | 2012-07-11 | 孙建军 | Environment-friendly energy-saving full-automatic heating device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108441593A (en) * | 2018-02-13 | 2018-08-24 | 鞍钢股份有限公司 | Method for judging whether gas is accumulated according to water level graphic of closed water system |
| CN111075731A (en) * | 2019-11-29 | 2020-04-28 | 东莞道汇环保科技股份有限公司 | Water leakage prevention system for circulating water pump and control method thereof |
| CN111075731B (en) * | 2019-11-29 | 2022-09-23 | 东莞道汇环保科技股份有限公司 | Water leakage prevention system for circulating water pump and control method thereof |
| CN114084927A (en) * | 2021-10-18 | 2022-02-25 | 江苏核电有限公司 | Equipment and method for deoxidizing cooling water of nuclear power plant equipment |
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| CN103193287B (en) | 2015-03-18 |
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