CN103193287B - 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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- CN103193287B CN103193287B CN201310147060.1A CN201310147060A CN103193287B CN 103193287 B CN103193287 B CN 103193287B CN 201310147060 A CN201310147060 A CN 201310147060A CN 103193287 B CN103193287 B CN 103193287B
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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 relating to heat exchange is widely used in industrial each production field, as the hydrologic cycle cooling system of the 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 water filling.Though pipeline is equipped with vent valve at main riser highest point, in the transverse tube top that system pipeline elbow, joint, fan coil top, gangway are downward, many air are still had to also exist.In addition, the air dissolved in water also can be separated when water temperature raises, and gathers and stays system pipeline top, forms local blank pipe.
The existence of air makes system occur many bad phenomenon even fault, as:
1, there is the gurgle underwater sound in pipeline, have certain noise to affect on environment;
2, cause the accelerated corrosion of iron and steel parts in system (pipeline), in the system of air prolonged stay, steel corrosion speed is several times of normally system;
3, the pressure dome retained causes heat radiation end or the loss of whole system thermal load;
4, water pump rotates and produces spiral water body, and the air intake pump head in transverse tube, because the mixture of water and air can be compressed, water pump cannot transmit feedwater effectively mechanical energy, greatly reduce discharge;
5, be dissolved in the gas in liquid, also can discharge when pressure, temperature variation, form steam void.When liquid internal pressure drop, during lower than liquid saturated vapor pressure at such a temperature, form steam bubble or steam void at regional area; And crushed by the pressure of surrounding suddenly at the local steam bubble that pressure raises, liquid stream extrudes with the center of high speed to steam bubble because of inertia, causes water impact to equipment.The generation of this microvesicle, debacle and cavitation is called to the whole process that wetted surfaces produces physics and chemistry effect.Especially easily occur in the water pump impeller place of high speed rotating, cause pump efficiency to decline;
6, pipeline not full packages, is equivalent to decrease pipe diameter, increases the resistance of ducting;
7, form vapour lock blank pipe, water pump cannot send to fan coil water, causes room, local not freeze (heating);
8, vent valve is at main riser highest point, in order to make the air retained in system take away arrival standpipe with current as far as possible, usually all selects high flow rate, high-lift pump during design.Often actual flow exceed that refrigerator needs flow 20%, even more than one times, cause the serious waste of pump motor power like this.The benefit that flow velocity is high is the air of system far-end to be transported to standpipe with current, is discharged by the automatic exhaust steam valve on standpipe top; But harm is the speed that the speed under the current direction of high flow rate rises higher than bubble, and bubble cannot be separated and be taken back system by current, in the fan coil of far-end or in the pipeline being present in bottom, form static air bag.
In order to solve above-mentioned technical barrier, domestic and international technician develops many corresponding technology, is arranged on pipeline eminence, scatterer drift angle etc. as used a large amount of vent valves manually or automatically.Chinese patent document 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 above, with the chilled water flow velocity being not less than 0.4m/s, take the water collector that vertical air in tube moves downward machine room lowest part to, by outside air collector and vent valve discharge system.
But in actual applications, no matter still strengthen flow velocity by standard flow rate design, or many drain taps are installed, all can not solve the still air bag problem formed in the duct completely.
Summary of the invention
The present invention is directed to above-mentioned shortcoming and problem, provide the method for removing of air in a kind of water circulation system.
For achieving the above object, the present invention takes following technical proposals to realize:
The method for removing of air in water circulation system, the pressure controlling water by arranging kinetic control system in water circulation system, and after system pipeline raises, reply downward height point position installation automatic exhaust steam valve, reduce the flow velocity of system water simultaneously, the discharge of system is made just to meet the water flow requirements of main frame, by changing ducted hydraulic pressure, get rid of the air assembled in pipeline in water circulation system, described method comprises following concrete steps:
A., when kinetic control system controls the pressure rising of water, air is soluble in water, with current away from original habitat;
B., when then kinetic control system controls the pressure reduction of water, air soluble in water is separated release from water, when conduit upper gathers a certain amount of, by outside 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 arranged on the filling pipe place of system pipeline, and time controller controls startup and the stopping of pipe pressurizing balance pump automatically by the time scale set.
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 arranged on the filling pipe place of system pipeline, and pressure controller is by the startup of the pressure automatic control pipe pressurizing balance pump set and stopping.
Further, described pipe pressurizing balance pump is low power in-line pump.
Further, reduce lift by changing low power water circulating pump, thus realize the flow velocity reducing system water.
For realizing the object of the flow velocity of above-mentioned reduction system water, the present invention by installing the running frequency that frequency conversion equipment reduces water circulating pump at water circulating pump place, can also realize the flow velocity reducing system water.
Further, when pipe pressurizing balance pump is opened, system pressure is higher than the 0.05-0.2MPa of static pressure according to claim 5 or 6.
The present invention is according to the method for removing of air in above-mentioned water circulation system, devise wherein a kind of equipment can getting rid of air in water circulation system, comprise main frame vaporizer, water trap, water collector, water circulating pump, fan coil, expansion tank, expansion tank float(ing)valve and system connecting tube, and the automatic exhaust steam valve of main riser vertex is installed, also comprise kinetic control system and be arranged on the automatic exhaust steam valve of replying downward height point position place after system pipeline raises.
Further, The present invention gives two kinds of implementations of described kinetic control system, the first scheme, described kinetic control system comprises 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 realizes on the basis of dynamic compensation principle, and described dynamic compensation principle utilizes under different water temperature and pressure, the characteristic that gas dissolving amount is different.Air, for water, belongs to indissoluble gases, 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；
In formula, N is air rate of mass transfer, kg/m
2h;
KL is liquid phase overall mass transfer coefficient, m
3/ m
2h;
C* and C is respectively the equilibrium concentration of air in water and actual concentrations, kg/m
3.
From above formula; Under certain temperature and pressure (when namely C* is definite value), gas dissolving speed be improved, just must be carried out reducer film thickness by the flow velocity and water body turbulent fluctuation degree increasing water and increase liquid phase overall mass transfer coefficient.And certain in water temperature, under the condition that dissolved-air pressure is not bery high, the dissolution equilibrium of air in water can be expressed as with Henry's law: V=KTp,
In formula, V is the solubleness of air in water, L/m
3;
KT is solubility coefficient, L/kPam
3;
P is the air balance dividing potential drop (absolute pressure) of superjacent, 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 DEG C) | 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 to dissolved-air pressure, and relevant with temperature.
The air capacity be dissolved in the water and the per-cent passing into air capacity, be called molten gas efficiency.
Under different dissolved-air pressure, the relation of the actual meltage of air in water and dissolved air time 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 of air in water is different.Such as, when absolute pressure is constant, water is heated to 30 DEG C from 0 DEG C, in water, Underwater sound field drops to 15.04mL/L from 29.18 mL/L, and this process i.e. the rear air of water flask heating separate out the phenomenon that microvesicle assembles Hu Bi from water.When such as opening again soda water bottle cap, in bottle, bubble occurs immediately, and this opens pressure drop after bottle cap, and in water, gas dissolving amount declines rapidly, and the carbon dioxide of dissolving discharges the phenomenon forming bubble.
Invention applies the water characteristic that quantity of dissolved gas is different at various pressures, by changing ducted hydraulic pressure, making air remaining in system incorporate in water when pressure raises, taking away original habitat with current; When pressure reduces, from water, be separated release, when conduit upper gathers a certain amount of, by outside automatic exhaust steam valve discharge system.And due to when increasing pressure or reducing pressure, all there is not negative pressure in system, so air is separated and discharged outside system would not enter system again.By the process constantly incorporating, take away, discharge, discharge, the air bag assembled can be got rid of completely in pipeline, the series of problems that the air thoroughly existed in solution legacy system causes.
Compared with prior art, the present invention has the following advantages:
1, by increasing kinetic control system, change the mode that traditional bubble takes away with high flow rate current, become air to dissolve in water and take away, thus to realize becoming passive exhaust be initiative exhaust, greatly improve exhaust effect, be proven, except by except the water-soluble micro-air of system, no longer include air bag phenomenon in pipeline and exist, pipeline is in full pipe condition, thus greatly reduce the systemic resistance of pipeline, lower and send water consumption;
2, eliminate air, make air prolonged stay system to cause steel corrosion speed to increase, therefore substantially prolongs pipeline life;
3, eradicated blend fluid of gas and water, system is quiet, without the gurgle underwater sound, and does not have cold and hot irregular phenomenon;
4, mechanical energy can better effectively be transmitted by water pump, reduces energy loss;
5, be full of water in water pump, inner formation moisture film, sealing in time, thus makes water pump be lubricated and lowers the temperature, and water pump is not fragile;
6, equipment investment expense is low, and the cooling/warming system of different size is applicable equally;
7, the method for exhausting of changes in temperature circulating water system of the present invention is installed simple, safe and practical, easy to operate, reduces the workload of debugging and operator.
Accompanying drawing explanation
Fig. 1 is water circulation system structural representation in the embodiment of the present invention 1.
Embodiment
Embodiment 1
A kind of water circulation system structural representation of the embodiment of the present invention 1 as shown in Figure 1, as can be seen from the figure, in eliminating water circulation system of the present invention, the equipment of air comprises main frame vaporizer 1, 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 arranged on 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 simultaneously automatic exhaust steam valve 12 is installed.Wherein expansion tank 6 is generally placed on uppermost storey, utilizes the gravity of water to system water filling.
The vent valve 8 being arranged on main riser highest point all can be arranged in general water circulation system, and may be automatic exhaust steam valve, also may be manual exhaust valve.And in the present embodiment, for coordinating the air of whole system automatically to get rid of, vent valve 8 is all 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 arranged on the filling pipe place of the system pipeline connecting expansion tank 6, and time controller 10 controls startup and the stopping of pipe pressurizing balance pump 11 automatically by the time scale set.When pipe pressurizing balance pump 11 runs, the hydraulic pressure in expansion water supply tank 6 enters system pipeline, makes it pressure and raises.When hydraulic pressure raises, the air (as the air that numerous water pipe heads, fan coil top etc. are assembled) stockpiled in pipeline is partly dissolved in water and takes away original place; 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, in pipeline, hydraulic pressure reduces, be dissolved into the air separation in water, be gathered in pipeline eminence, discharge system by automatic exhaust steam valve 8 and 12 place.
By taking above-mentioned measure, if the flowing of ducted air system water can by airstrip wherein from, and no longer rely on the current of high flow rate to take away, therefore significantly can reduce the flow velocity of water, thus energy efficient.And the bubble of low flow velocity is easier is separated from water, rises to pipeline eminence and assemble, outside automatic exhaust steam valve 8 and 12 removal system.
In the present embodiment, the flow velocity reducing water realizes by various ways, and good method has two kinds, and a kind of is the rotating speed reducing water circulating pump 2, and the running frequency namely reducing water circulating pump 2 by installing frequency conversion equipment realizes; Another kind changes low power water circulating pump 2 to reduce lift.Above-mentioned two kinds of methods all can reduce system energy consumption, according to the needs of practical situation, can select suitable scheme.
Embodiment 2
Basically identical in the structural representation of water circulation system and embodiment 1 in the present embodiment, main difference is kinetic control system, employing be pressure controller and pipe pressurizing balance pump.Pressure controller presses startup and the stopping of certain pressure automatic control pipe pressurizing balance pump.
Except the time controller adopted in above-mentioned two embodiments and pressure controller are to realize the Dynamic controlling of pipeline pressure in the present invention, other kinetic control system can also be selected according to actual needs, mainly can meet the rising of Dynamic controlling pipeline pressure and reduce.
Embody rule example
1, Yiwu hotel, when not installing technical scheme of the present invention and carrying out technological improvement, is provided with York unit 2,3,45KW refrigerant water pump, 37KW cooling-water pump 3.In order to energy-conservation, wherein cooling with coolant circulating system installed frequency transformer additional, the phenomenon that the appearance air-conditioning result of use making the floor in the 18th to 21 buildings regular is bad, just at every turn all will by artificial air-discharging, add water after solve reluctantly.By the optimization design of we technician, adopt dynamic compensation technology of the present invention, kinetic control system and automatic exhaust steam valve are installed, coordinate the transformation of optimum condition operating circulating water pump simultaneously, when water circulating pump installation power 11KW, just meet air-conditioning result of use, more than the 18 layers in-and-out phenomenons of air-conditioning are solved simultaneously.
2, Zhejiang Yi Mei thin film industry Group Co., Ltd, when not using the technology of the present invention method to transform, film line circulating water system installs the chilled water pump motor 8 of 75KW, 4,1320KW main frame, 55KW cooling-water pump 6.Actual use opens 4 refrigerant pumps, workshop also have portion cold carry less than.And by coordinating efficient pump to transform again after application the present invention, the water circulating pump that cooling and refrigerant pump all use 22KW instead just meets Production requirement.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; the Method and Technology content of above-mentioned announcement can be utilized to make possible variation and amendment to technical solution of the present invention; therefore; every content not departing from technical solution of the present invention; the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the protection domain of technical solution of the present invention.
Claims (10)
1. the method for removing of air in water circulation system, it is characterized in that, described water circulation system comprises main frame vaporizer, water circulating pump, water trap, water collector, fan coil, the expansion tank of floating ball valve of rehydration is housed, be arranged on vent valve and the connecting tube of main riser highest point, kinetic control system is set in water circulation system to control the pressure of water, and after system pipeline raises, reply downward height point position installation automatic exhaust steam valve, reduce the flow velocity of system water simultaneously, the discharge of system is made just to meet the water flow requirements of main frame, by changing ducted hydraulic pressure, get rid of the air assembled in pipeline in water circulation system, described method comprises following concrete steps:
A., when kinetic control system controls the pressure rising of water, air is soluble in water, with current away from original habitat;
B., when then kinetic control system controls the pressure reduction of water, air soluble in water is separated release from water, when conduit upper gathers a certain amount of, by outside automatic exhaust steam valve removal system.
2. the method for removing of air in 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 arranged on the filling pipe place of system pipeline, and time controller controls startup and the stopping of pipe pressurizing balance pump automatically by the time scale set.
3. the method for removing of air in 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 arranged on the filling pipe place of system pipeline, and pressure controller is by the startup of the pressure automatic control pipe pressurizing balance pump set and stopping.
4. in the water circulation system according to Claims 2 or 3, the method for removing of air, is characterized in that, described pipe pressurizing balance pump is low power in-line pump.
5. the method for removing of air in water circulation system according to claim 4, is characterized in that, reducing lift by changing low power water circulating pump, thus realizes the flow velocity reducing system water.
6. the method for removing of air in water circulation system according to claim 4, is characterized in that, installs the running frequency that frequency conversion equipment reduces water circulating pump at water circulating pump place, thus realizes the flow velocity reducing system water.
7. in the water circulation system according to claim 5 or 6, the method for removing of air, is characterized in that, when pipe pressurizing balance pump is opened, system pressure is higher than static pressure 0.05-0.2MPa.
8. get rid of the equipment of air in water circulation system for one kind, comprise main frame heat exchanger, water trap, water collector, water circulating pump, equipment heat exchanger, expansion tank, expansion tank float(ing)valve and system connecting tube, and the automatic exhaust steam valve installing main riser vertex, it is characterized in that, also comprise kinetic control system and be arranged on the automatic exhaust steam valve of replying downward height point position place after system pipeline raises.
9. the equipment of air in 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 arranged on the filling pipe place of system pipeline, and time controller controls startup and the stopping of pipe pressurizing balance pump automatically by the time scale set.
10. the equipment of air in 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 arranged on the filling pipe place of system pipeline, and pressure controller is by the startup of the pressure automatic control pipe pressurizing balance pump set and stopping.
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| CN201310147060.1A CN103193287B (en) | 2013-04-25 | 2013-04-25 | Method and equipment for exhausting air in water circulation system |
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|---|---|---|---|
| CN201310147060.1A CN103193287B (en) | 2013-04-25 | 2013-04-25 | Method and equipment for exhausting air in water circulation system |
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| CN103193287B true CN103193287B (en) | 2015-03-18 |
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| CN108441593A (en) * | 2018-02-13 | 2018-08-24 | 鞍钢股份有限公司 | A method of according to closed circuit water system water level figure judge its whether accumulated gas |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1016990B (en) * | 1990-03-09 | 1992-06-10 | 何积顺 | Micropressure boiler hot water and heating system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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