CN105477943A - Method for controlling moisture on air filtering elements - Google Patents
Method for controlling moisture on air filtering elements Download PDFInfo
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- CN105477943A CN105477943A CN201610023863.XA CN201610023863A CN105477943A CN 105477943 A CN105477943 A CN 105477943A CN 201610023863 A CN201610023863 A CN 201610023863A CN 105477943 A CN105477943 A CN 105477943A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/003—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/4263—Means for active heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
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Abstract
The invention provides a method for controlling moisture on air filtering elements, relates to the field of air filtering and aims to effectively remove water molecules from the filtering elements, so that filter cakes on the surfaces of the filtering elements can keep dry and breathable. The method can prevent or solve the problem that the filter cakes form wet scale on the surfaces of the filter elements and prevent the situation that the energy consumption of air filters is increased, and operation of the air filters is unstable due to the wet scale of the filter cakes. To achieve the purposes, the method is implemented through energy output devices arranged on the air filters and comprises steps as follows: 1), judging whether liquid water is produced or is likely to be produced on the filtering elements in the air filters; 2), conveying energy to water molecules used for forming the liquid water through an energy conveying device to drive the water molecules to be separated from the filtering elements if the judgment result of the step (1) is positive; 3), removing the water molecules separated from the filtering elements from the filtering elements.
Description
Technical field
The present invention relates to field of air filtration.
Background technology
In the prior art, air filtration is that air is passed into deduster, utilizes the filter element in deduster to realize tackling to reach to the suspension fine particle in air the object of purification of air.The fine particle having part after fine particle wherein in air is blocked is attached on filter element and forms filter cake.
A kind of turbine gas compressor front end deduster is refer in Chinese patent application 201310024020.8, by filter element and the orifice plate that is connected with the filter element second space by the first space and filtering gas place that are divided into gas place to be filtered in deduster case member in this deduster, and adopt can by the filter material composition filter element of dust clearance more than 99% of particle diameter >=0.5 in gas to be filtered μm.
But inventor finds, in above-mentioned deduster, often just occur the problem that filtration operating power consumption increases suddenly after a period of operation, this problem often appears at rainy weather, finds that the running status of deduster in rainy weather is relatively unstable simultaneously.
In order to probe into the reason that this problem exists further, inventor adopts the operation work of multiple sensors to deduster comprising power meter, pressure gauge, thermometer, hygrometer etc. to carry out data monitoring, find when after one section time, unrecoverable data is analyzed, the main cause that deduster energy consumption increases is increased by the pressure differential between the weather of filter element and leeward side to cause.And inventor finds further more afterwards at work, there is the fluctuation that night raises, daytime reduces in time in the pressure differential between the filter element weather that pressure gauge records and leeward side, and whenever rainy weather, pressure differential suddenly increases to and is several times as much as conventional value, and fall after rise gradually in a couple of days to conventional value after wet weather, but generally can a little more than conventional value.
Now, when inventor contrasts humidity data further, then find that above-mentioned pressure oscillation trend and moisture fluctuation trend present uniformity, and slightly lag behind moisture fluctuation trend in time.
On the basis of the above, inventor finds after further test and study, cause the subject matter of above-mentioned reason be due to air humidity excessive time steam be phase-changed into aqueous water and be attached to filter element surface, and be that the grit also existed by filtering interception forms filter cake in filter element surface.Like this, the moistening fouling that gas not easily passs through may be formed be attached to by filter membrane blockage of the micro orifice on filter element after filter cake contacts with aqueous water, thus cause the problem that deduster filter pressure raises, energy consumption increases filter element damage rupture even.
And inventor is finding after further studying, the filter element filtration pressure difference that air humidity is comparatively large and cause increases, filter the problem that operating power consumption increases is not only be present in above-mentioned deduster, this problem but be extensively present in the filter element of various employing different structure and filter material.
Summary of the invention
Provided by the inventionly a kind ofly control the method for moisture on air filter element and be intended to effectively hydrone to be detached from filter element, thus make the filter cake of filter element surface keep dry state to breathe freely.Filter cake forms moistening fouling problem in filter element surface can be prevented or solve to the method well, and air cleaner energy consumption increases, fluctuation of service to avoid the moistening structure of described filter cake to cause.
For achieving the above object, a kind of method controlling moisture on air filter element provided by the invention, the method depends on the energy output device be arranged on air cleaner and realizes, and step comprises: 1) judge whether the filter element in air cleaner produces maybe may produce aqueous water; 2) if step 1) be judged as YES, then transmit energy by energy output device to the hydrone for the formation of described aqueous water and then promote that these hydrones are separated with filter element; 3) hydrone be separated with filter element is detached filter element.
The method of moisture on the control air filter element provided in the present invention, the technique effect of realization can be following two kinds but be not limited only to following two kinds:
The first technique effect is by the moisture removal in the moistening fouling of filter cake formation on filter element by method of the present invention.When filter element having contained more aqueous water, when these aqueous waters can be formed the moistening fouling of filter membrane blockage of the micro orifice with filter cake.Now by energy output device to these liquid water molecules conveying capacities, and then promote that these hydrones are separated with filter element, also just achieve and liquid water molecules is removed from filter cake, destroy the moistening fouling that filter cake and water are originally formed, thus hydrone is separated from filter element.
The second technique effect is accumulated on filter element by method prevention moisture of the present invention to make filter cake form moistening fouling.When in filter cake containing moisture or the moisture that contains less time, when aqueous water now on filter element is also not enough to filter cake is formed the moistening fouling of filter membrane blockage of the micro orifice, now realize accelerating moisture by energy output device to remove from filter cake, reduce the amount containing carrying liqs water in filter cake, simultaneously also by the effect of energy output device, promote to move to gaseous state direction to liquid state containing the dynamic equilibrium of water between gaseous state and liquid state of band in air to be filtered.
Inventor finds in above-mentioned two kinds of technique effects, under same Energy transmission, hydrone is detached filter element relative to easier during the moisture removed in moistening fouling when forming moistening fouling by prevention moisture accumulation, this is because when filter element having been formed moistening fouling, may hydration reaction be there is between aqueous water and filter cake, thus need more energy to be removed from moistening fouling by moisture.But inventor also finds, after being separated from moistening fouling by moisture, originally in filter cake, the fine dusts of free settling is not often gathered into the larger dust of particle, is conducive to the cleaning regeneration of filter element in air cleaner.
Based on the above method, further by the filtered airflow in filtration work, above-mentioned hydrone can be detached from filter element.
The method of moisture on the control air filter element provided in the present invention, its principle mainly realizes from two aspects:
First, the energy carried by energy output device improves the heat energy of filter element and the heat energy of filter cake, by increasing the intermolecular kinetic energy of moisture on filter element, thus promote that the solid-state or aqueous water phase-splitting in filter element surface and filter cake becomes gaseous state and taken away by air to be filtered.
The second, the heat energy carried by energy output device also can realize raising through the temperature of the air to be filtered of filter element naturally, is equivalent to the degree of unsaturation adding air to be filtered like this.
In summary, in the reduction filter cake in the present invention, the method for moisture can be accelerated moisture in filter element surface filter cake along with filtered airflow and takes away, and prevention filter cake and aqueous water are combined in filter element surface and form the moistening fouling that air to be filtered is difficult to pass through; And, when filter element surface existed filter cake to be combined with aqueous water form moistening fouling time, transmit its energy to the hydrone in moistening fouling by energy output device, thus the hydrone on filter element be separated from filter element.The liquid phase water that said method accelerates to be combined with filter cake is that steam is pulled away, the moistening fouling that gas script filter cake and aqueous water formed in filter element surface cannot pass through destroys, the gas passage making the filter cake on filter element again form air to be filtered can to pass through.Like this, the technical problem that the method provided in the present invention can solve is prevention or solves the moistening fouling of filter cake that filter element occurs and the problem of the filter element energy consumption caused increase, operating efficiency reduction.
For realizing said method, can adopt be provided with energy output device adopt heat trnasfer realize, or molecular resonance can be adopted realize, wherein heat energy can directly act on filter element by energy output device, and the heat energy of output also can be acted on the air to be filtered of filter element front end by energy output device.
It should be noted that, in the prior art, the air dewetting technology in air cleaner is mainly started with from two aspects:
The first be absorption method by the water vapor adsorption in air to be filtered, this adopts the high material of osmotic pressure or the material that can react with water that the steam in air is carried out absorption to tackle.But described absorption method needs often to change adsorbent, and likely can produce waste liquid or waste residue, general, there is higher cost.
The second is that condensation method is by the water vapor condensation in air to be filtered, this contains according to dry air to be with the ability of steam to be increase with the temperature rising of air: such as under standard atmospheric pressure (0.1013MPa), when temperature is-20 DEG C, be 1.07kg/m when reaching capacity containing the steam of band in air
3, when 0 DEG C, be 4.85kg/m when reaching capacity containing the steam of band in air
3, when 20 DEG C, be 17.3kg/m when reaching capacity containing the steam of band in air
3, when 50 DEG C, be 82.8kg/m when reaching capacity containing the steam of band in air
3.So just find out, the temperature of humid air reduced, can by humid air with steam separate out.Condensation method is the common technology of air dewetting in current technology.
This just can find out, what current those skilled in the art considered is all how by the moisture removal in air to be filtered for filter element front end, reduces the water content of air to be filtered.Especially above-mentioned condensation method, need the temperature of air to be filtered to reduce, this exactly runs in the opposite direction with the technological means that adopts in the present invention.
So inventor also just finds, although method of the prior art effectively can reduce the moisture in the air to be filtered of filter element front end, the technical problem that aqueous water to be solved by this invention and filter cake form moistening fouling on filter element in not all situation, can be realized.
Separate out this is because the steam in air to be filtered becomes aqueous water mutually in filter element surface, this is not only relevant with the water content in air, also relevant with the relative humidity of air, so also just explanation, on control air filter element in the present invention, the method for moisture is realized by heating, no matter this heating acts on the air to be filtered of filter element or filter element front end, the temperature that all must result through the air to be filtered of filter element directly or indirectly raises, and after the temperature of air to be filtered raises, under identical operating pressure, the saturated humidity ratio of the air to be filtered after temperature raises increases, and the water content now in air remains unchanged, so the relative humidity of air to be filtered reduces after temperature raises.
Here it is after the relative humidity of air to be filtered reduces, in air to be filtered with steam also can be understood as more unsaturated, thus air first to be filtered by filter element time, in air with steam more Stephania epigaea easily from air separate out and be attached on filter element; Meanwhile, the aqueous water on filter element in by filter element, can be become steam and take away by air to be filtered more easily mutually.
In addition, in the present invention adopt and reduce the method for moisture in filter cake and also attach and can solve another one problem.Inventor also finds, when air themperature is lower than corresponding freezing point temperature, still can with a certain amount of steam in air, but these steam once separate out on filter element, then be easy to directly to be condensed into solid-state, and solid-state ice inherently can form the airtight layer of one deck densification on filter element, cause the blocking to filter element, cause filtration pressure difference suddenly to increase; Meanwhile, solid ice is the crystal that a kind of hardness is larger, easy scratching or sting filter element, causes many small mechanical damages to filter element, is difficult to repair.And in the above-mentioned methods, pass through energy output device, then can address this problem well, not only the moisture in filter cake can be accelerated to remove, and avoid the steam in air on filter element, separate out into ice body causing damage by the temperature improving filter element.In the present invention, for the work influence of filter element, there is the identical feature of essence after vaporous water in air to be filtered becomes aqueous water or solid water mutually, so in this manual, brief and concise in order to what describe, what be mainly described and analyze is Phase-change Problems between vaporous water and aqueous water, but does not represent outside the discharge of the situation of solid water.
Further, detecting the weather of air filter element or the air humidity of leeward side, when finding that Humidity Detection value reaches the first threshold of setting, starting energy output device.Monitor and detection is carried out by the air humidity of the direct weather to filter element or leeward side, thus when humidity reaches certain value, estimate filter element to be about to start or occurred the moistening scale formation of bleed, then this humidity value is carried out the threshold value of work as startup energy output device.
It should be noted that simultaneously, at above-mentioned weather refer to filter element and meet side to air to be filtered, the weather of filter element contacts prior to air to be filtered; The leeward side of corresponding filter element refers to the side of air to be filtered dorsad, what the leeward side of filter element contacted is filtered air.
In addition, in the above-mentioned methods, the air humidity value no matter measured is weather or leeward side, be all in theory also exist certain advanced, this is because when the air humidity that sensor detects increases to certain humidity value, what now illustrate is that air can make filter cake on filter element, form moistening fouling at the moisture of separating out through filter element, but, from air, separate out aqueous water on filter element, and aqueous water and filter cake form moistening fouling on filter element, and this is need a time course eventually.So the threshold value that mensuration air humidity starts as energy output device can prevent the moistening fouling of filter element preferably.
Preferably, detecting the relative humidity of the weather air of air filter element, when finding that relative humidity reaches 80% ~ 95%, starting energy output device.Characterizing the mode of air humidity has varied, though the mode of this wherein various different sign humidity can realize mutual conversion to a certain extent, also has the meaning stressed separately.Inventor finds, for moisture removal method in research filter cake main in the present invention, volume water capacity (or being scaled volume water capacity or the absolute humidity) nature of air has a certain impact for the moisture removal method in filter cake, but inventor finds that humidity parameter is relative air humidity more intuitively.The relative humidity of air, can be understood as the water content degree of saturation of air, and when the relative humidity of air is 0% time, air is absolutely dry air, and when the saturated humidity of air is 100%, air reaches capacity humidity.And according to the principle of dynamic equilibrium, when degree of saturation moisture in air is higher time, dynamic equilibrium between gaseous state and liquid state trends towards moving to the direction of liquid conversion, otherwise, time in air, moisture degree of saturation is lower, the dynamic equilibrium between gaseous state and liquid state trends towards moving to the direction of gaseous state.And need in the present invention the problem solved be the moisture in filter cake is accelerated take away, the moisture simultaneously reduced in air separates out and is attached on filter cake (and filter element), so adopt relative humidity to be a kind of very simple and clear mode as the threshold value that characterization control energy output device starts.
Inventor is finding after research, dynamic equilibrium through water phase transformation between gaseous state and liquid state of filter element can be understood with so a kind of situation: when air filtration work once, filter element just should be attached with a certain amount of filter cake, and consider in real work there is not absolutely dry air, thus filter cake is bound to a certain amount of moisture; But meanwhile, because air to be filtered also can form air-flow in by filter element, so also just the aqueous water on filter element or filter cake is corresponding can take away, achieve the evaporation effect of a kind of similar " air-dry ".Steam in air to be filtered condenses and evaporates on filter element is a process of dynamically carrying out, but the relative humidity that key is exactly air to be filtered reaches when how to be worth, and obviously can start to accumulate aqueous water and impact filtration work on filter element or on filter cake.So key to find out the threshold value of this relative humidity.
With such object after research, inventor finds after the filter element by different filter material, access structure is studied at the air to be filtered for different temperatures, absolute humidity.In real work, when the relative humidity of air to be filtered reaches 100%, inevitable condensation on filter element separates out aqueous water, if and it is corresponding when the absolute humidity of air to be filtered itself is larger, air separates out the threshold value of moisture often without the need to the maximum of the humidity that reaches capacity, when what or filter element surface comparatively complicated for filtration access structure adopted simultaneously is the filter material of pottery or metal material, the threshold value separating out moisture even will drop to less than 80%.So in the present invention, what inventor preferably adopted is when detecting that relative humidity reaches 80% ~ 95%, start energy output device, so both can not start energy output device too early and cause the waste of energy consumption, and can control air to be filtered just started to possess on filter element, separate out moisture in heat.
And mention above, the relative humidity of air is relevant with the temperature of the water content of air and air, so after startup energy output device, the temperature of corresponding air to be filtered also can be improved, this adds heat abstraction with regard to not only achieving to the aqueous water in filter element and filter cake, and can reduce the rh value in air to be filtered.Also just therefore, if what inventor found to detect is the relative humidity of the leeward side air of filter element, then when after startup energy output device, the relative humidity of leeward side air can be reduced to below threshold value naturally, if what that now adopted is feedback control system, then easily cause the concussion of system, the relative humidity system detecting filter element weather air is by contrast then more stable.
Further, described energy output device is a kind of for being about to the heater that heated by the air to be filtered of filter element; The heating amplitude of filtered air treated by this heater, and the temperature variation of the filtered air detected with the temperature sensor being arranged on filter element leeward side judges, then for temperature raises 3 DEG C ~ 20 DEG C.
First, the temperature of air to be filtered is raised higher, be naturally more conducive to detaching of liquid water molecules on filter element.But the too high energy consumption that also can cause of temperature increases and easily exceeds the heat-resistant limit of filter element and destroy air cleaner.
The temperature variation of the filtered air detected with the temperature sensor being arranged on filter element leeward side is used as judgment standard, and wherein not comprising necessarily must at air filtration wherein set temperature sensor.
Inventor finds, when the temperature of air to be filtered increases about 5 DEG C, the relative humidity of 90% obviously can drop to no longer obviously condensation and separate out the degree of aqueous water.For example-50 DEG C time, the relative humidity of air 90% can drop to 52.3% after atmosphere temperature rising is to-45 DEG C; When 0 DEG C, the relative humidity of air 90% can drop to 64.3% after atmosphere temperature rising is to 5 DEG C; When 35 DEG C, the relative humidity of air 90% can drop to 63.2% after atmosphere temperature rising is to 40 DEG C.This shows, only need to raise air to be filtered 5 DEG C, the relative humidity that can realize air to be filtered significantly declines.
On above-mentioned basis, inventor, through repeatedly realizing, when finding minimum for the temperature of air to be filtered only increase by 3 DEG C, still can realize the basic guarantee reducing relative air humidity to be filtered.
And, inventor also finds, for the air cleaner on the domestic most of air cleaner of China, environment residing for general operating temperature is between-20 DEG C ~ 40 DEG C, for this working temperature environment, the temperature of air to be filtered is increased by 20 DEG C and can promote that the hydrone on filter element detaches expeditiously, now first for the control to energy consumption, certain damage may can be caused to Partial filtration element when second the temperature of air to be filtered being increased to more than 60 DEG C, so inventor is a kind of preferably control method within feeling that the temperature of air to be filtered is raised 20 DEG C.
Carry out preferably said method one, the heating amplitude of filtered air treated by this heater, and the temperature variation of the filtered air detected with the temperature sensor being arranged on filter element leeward side judges, then for temperature raises 3 DEG C ~ 8 DEG C.The temperature of air to be filtered is raised 3 DEG C ~ 8 DEG C and can effectively promote that hydrone is separated with filter element, extremely low energy consumption can also be realized simultaneously.
In addition, different with said method, detecting the filtration pressure difference between weather and leeward side when filter element works, when detecting that this filtration pressure difference reaches the Second Threshold of setting, starting energy output device; When wherein said Second Threshold is for detected filtration pressure difference relative filter element normal filtration pressure reduction increase more than 50%.
Wherein it should be noted that, described normal filtration pressure reduction refers in the relative humidity working environment below 60%, filter element at least continuous operation 10 days detect the filtration pressure difference between filter element weather and leeward side obtained.
In this approach, monitoring be that aqueous water and filter cake form moistening fouling thus cause the effect that the filtration pressure difference of filter element increases suddenly on filter element, thus the actual state on filter element to be monitored.This method is intuitively rapid, and it is more accurate to control, and there is not significantly advanced or hysteresis quality, so be also not easy the erratic fluctuations repeatedly occurred in control procedure.
But the method that this pressure for filter element both sides carries out test and monitoring is easily disturbed by other factors comparatively speaking, so also there is risk stable scarcely.
Above-mentioned using pressure differential as in the method for detected parameters, following two kinds of modes can be adopted as control method.
The first, detect the filtration pressure difference between weather and leeward side when air filter element works, when detected pressures difference reaches the Second Threshold of setting, start energy output device; When described Second Threshold being set as filtration pressure difference increases by 50% ~ 100%.
The second, detect the filtration pressure difference between weather and leeward side when air filter element works, when detected pressures difference reaches the Second Threshold of setting, start energy output device; When described Second Threshold being set as filtration pressure difference increases by more than 100%.
Inventor finds, for filter element, when filtration work is carried out, the fluctuation in normal range (NR) can be thought when filtration pressure difference between weather and leeward side relative filter element normal filtration pressure reduction increases below 50%, but when the filtration pressure difference of filter element both sides is greater than 50%, then can be judged as the aqueous water that filter element accumulates just has been started to produce certain have impact on to filtration work, and wherein after filtration pressure difference rises to and is greater than 100%, then can be understood as the work of filter element produced to obviously impact and exported also to cause on the operating power consumption of filter element relatively significantly affects.
So, when the Second Threshold starting energy output device is set as that filtration pressure difference increases by 50% ~ 100%, then can think to judge that the liquid water yield that the filter element in air cleaner produces is about to have an impact to filtration work, now starting energy output device then can prevent the aqueous water on filter element and filter cake to form moistening fouling effectively, belongs to one and prejudges control method.
When the filtration pressure difference of filter element both sides filter material being detected increases by 100%, then can be judged as filter element has produced a certain amount of aqueous water, and these aqueous waters exert a certain influence to filtration work, this now starts such its object of two output devices is in order to avoid hydrone continues to assemble on filter element, also be also in order to the liquid water molecules on filter element is separated with filter element simultaneously, can make like this moistening fouling of densification that in filter element surface, aqueous water and filter cake are formed again formed after the drying that dewaters filtered air by passage.
Inventor is finding after multiple research, and described filter element comprises the supporter be made up of high density porous polyethylene, woven fabric or nonwoven needling fiber, also includes the expanded PTFE filtration membrane being adhering closely to this supporting body surface.
Being attached on supporter by expanded PTFE filtration membrane is in order to filter element has higher structural strength, and wherein high density porous polyethylene is rigid support, and woven fabric and nonwoven needling fiber are flexible supporter.Wherein preferably high density porous polyethylene makes supporter.
First above-mentioned filter material is further illustrated below.
The performance (comprising precision, air penetrability, the strength of materials, toughness etc.) of the filtering material of filter element is most important for the service behaviour impact of air cleaner.Adopt expanded PTFE filtration membrane can guarantee that air cleaner has extraordinary strainability as filter material, and described expanded PTFE filtration membrane operating temperature can be resistance to more than 250 DEG C, have extraordinary heat endurance, the method that can realize in the present invention heats.
This is because above-mentioned eptfe film has extraordinary resistance to pressure, the pressure differential of at least more than 6000Pa can be born and still normally work, the filter material that above-mentioned eptfe film is made is through measuring, during its normal initialization, the pressure differential between weather and leeward side should fluctuate at about 2500Pa.
And the hole density of expanded PTFE filtration membrane itself can adjust according to manufacturing process, and inventor is from the angle of practical application, in order to ensure compared with under the prerequisite of high filtering precision, adopt and produce larger filtration flux with less filter pressure, the specific embodiment of the present invention also further hole density by expanded PTFE filtration membrane is set as 5 × 10
8individual/cm
2to 30 × 10
8individual/cm
2.By the hole density of expanded PTFE filtration membrane is set in above-mentioned scope, the degree that the filter efficiency of expanded PTFE filtration membrane reaches more satisfactory can be made.Test finds, when the porosity of high density porous polyethylene supporter is all 30%, when the hole density of expanded PTFE filtration membrane is 15 × 10
8individual/cm
2, when filtration pressure difference equals 190Pa, filtration flux is 2m
3/ m
2min.When maintenance filtration flux is constant, the hole density of expanded PTFE filtration membrane improved further, filtration pressure difference then can reduce.On the contrary, when maintenance filtration flux is constant, the hole density of expanded PTFE filtration membrane reduced, filtration pressure difference then can raise.When hole, density is reduced to 5 × 10
8individual/cm
2time, filtration pressure difference is elevated to about 500Pa, in the present embodiment, therefore is 5 × 10 by the hole density limitations of expanded PTFE filtration membrane
8individual/cm
2above.According to the manufacture craft of current expanded PTFE filtration membrane, be 30 × 10 by the hole density limitations of expanded PTFE filtration membrane
8individual/cm
2below.Further, in the present embodiment, preferably the hole density of expanded PTFE filtration membrane is set as 10 × 10
8individual/cm
2to 25 × 10
8individual/cm
2, meanwhile, in the present embodiment, the porosity of high density porous polyethylene supporter can be set between 25% to 70%, preferably between 30% to 60%.
Such filtration is in reality test, described expanded PTFE filtration membrane treats the clearance of the dust of particle diameter >=0.5 in filtering gas μm more than 99%, also higher air penetrability can be had, adopt the air cleaner that this filter material is made, using the air filtering method in the present invention, through experiment with calculate, 1 year at least can be run and without scale formation.
Adopt the filter element of above-mentioned filter material, inventor detects when normally working, and the pressure differential between filter element weather and leeward side fluctuates about about 2300 ~ 2700Pa, and wherein night is comparatively large, and less in the daytime, total ripple is relatively steady.
But once run into the moistening fouling and clogging caused after air humidity significantly increases, then the pressure differential of filter element both sides even can increase to more than 6000Pa suddenly.
In above-mentioned filter element, after threshold value energy output device being started work is placed on the scope that above-mentioned pressure differential increases, find in the monitoring of filter element, in the work operation of filter element, above-mentioned pressure differential maintains about 2100 ~ 2600 fluctuations substantially, substantially obvious pressure differential is there will not be suddenly to increase phenomenon, and substantially can not find the moistening fouling of obvious filter cake and aqueous water formation on filter element, the energy consumption that in monitor procedure, air cleaner is overall obviously reduces.Can find out through overtesting and can effectively solve problem filter element being formed moistening fouling by energy output device.
Be further, described air cleaner is a kind of deduster for the dedusting of air compression system front end, the output of filtered air of air cleaner connects air compression system input, air compression system connected as the heat exchanger of energy output device by compressed air output, this heat exchanger uses the hot air step 2 after air compression system compression) described in for the formation of the hydrone of described aqueous water.
Air cleaner is connected with air compression system, air through air cleaner dust removal by filtration is passed into air compression system, and the intermolecular kinetic energy utilizing air compression system compressed air to produce (macro manifestations is heat energy) as energy output device energy source to the hydrone for the formation of described aqueous water carry out heating can realize recycling energy.
Wherein the preferred disc type tubular structure of energy output device or disc type laminated structure are as heat exchanger, wherein above-mentioned disc type tubular structure or disc type laminated structure are communicated with air compressor, because air in air compressor is after doing manual work through overcompression, air internal energy after compression increases, temperature generally can reach 55 DEG C ~ 75 DEG C, the air that the air compression system even had exports after compression can reach more than 80 DEG C, and for air compressor, to the work that can be unfavorable for air compression system in producing in air compressing process, often need in air compression system, be provided with cooling device can take away in compressed air generation, and the air internal energy be pulled away often can not carry out next step utilization again, compressed air after exactly being compressed by air compression system in the present invention passes into described disc type tubulose or disc type laminated structure and treats filtered air and heat, thus the secondary that can achieve energy utilizes, also the energy consumption of air filtering system can not be caused additionally to increase.
In addition, described energy output device can also be microwave generator or electric heater.Microwave generator can carry out intermolecular resonant to target effect microwave and realize the intermolecular kinetic energy increase of target, and electric heater is also a kind of energy output device of excellent performance.
Further, step 4), this step 4) in step 2) and carry out while or Following step 2) thereafter blowback is carried out to filter element.
In step 4) in, blowback for filter element can be arrange some filter elements in air cleaner, and these filter elements are divided into many groups, carry out independent blowback one by one to each group of filter element, the filtration work and the blowback work that realize air cleaner are carried out simultaneously.
Can certainly be that overall blowback is carried out to each filter element, such as have a kind of Venturi tube just generally to serve as in filter element back-blowing device in the prior art.
The effect that the blowback mentioned in the above-mentioned methods can realize mainly contains:
The first, the filter cake on filter element is removed, realizes the clean of filter element and regeneration, thus reduce the filter pressure of filter element; The second, the filter cake on filter element is removed, carrier air filter element accumulating moisture is removed, thus the accumulation preventing and remove moisture on filter element can be realized.
So just can find out, above-mentioned reverse gas cleaning can solve the moistening fouling and clogging problem of filter element surface further.
And it should be noted that, be not only that reverse gas cleaning can promote to control moisture on air filter element, vice versa equally.A kind of moistening fouling of densification can be formed after the aqueous water that filter cake on filter element and condensation are separated out is combined, after by the moisture removal in described moistening fouling, this moistening fouling can chap into several dirty blocks after drying, now quickly and easily the dirty block that moistening fouling is formed can be peeled off removing from filter element by cleaning element.Such mode is obvious especially for the removal effect of the dust (0.1 ~ 0.12 μm) of small particle diameter, even if because the dust of this small particle diameter in clean reproduction operation from ablation filter element, also be difficult to be deposited in dirt storehouse collect and remove, easily be suspended in around filter element on the contrary, after new filtration work starts, again can be adsorbed onto again on filter element and be difficult to remove.
Based on the above method, described air cleaner includes the case member installed for filter element, its housing device forms tubular construction, the sidewall of this tubular construction is provided with air intake structure, wherein air intake structure is interrupted around tubular construction week body or offers continuously, be positioned at this air intake structure place to be provided with energy output device and to act on this air intake structure, this air intake structure forms the tubular alternating temperature band be enclosed in by filter element wherein.
This is a kind of to the preferred embodiment of energy output device to the hydrone transmitting energy for forming aqueous water on filter element.The air inflow that air intake structure realizes increasing air cleaner is offered by continuous on the housing of tubular construction or interruption, and arrange tubular alternating temperature band at described air intake structure place filter element is surrounded wherein, realize treating filtered air and carry out even, stable Energy Transfer.
Can find out in sum, a kind of method removing moisture in filter element filter cake provided in the present invention and the filter element clean method that include the use of the method can prevent, remove the problem of the moistening fouling of filter element surface effectively, and the filter element operating power consumption correspondingly solving described moistening fouling and cause increases and fluctuation of service problem.
Below, carry out further describing and explanation to said method in conjunction with specification drawings and specific embodiments.
Accompanying drawing explanation
Fig. 1 is the air cleaner in the present invention.
Fig. 2 is the filter element enlarged diagram in the present invention.
Fig. 3 is the closed loop feedback control block diagram in the present invention.
Fig. 4 is a kind of energy output device in the present invention.
Filtration pressure difference between the filter element weather that Fig. 5 records for the air cleaner in background technology and leeward side.
Filtration pressure difference between the filter element weather that Fig. 6 records for the air cleaner in embodiment one and leeward side.
Filtration pressure difference between the filter element weather that Fig. 7 records for the air cleaner in embodiment two and leeward side.
Filtration pressure difference between the filter element weather that Fig. 8 records for the air cleaner in embodiment three and leeward side.
Fig. 9 is that air cleaner in the present invention is as a kind of deduster for the dedusting of air compression system front end.
The filtration pressure difference that Figure 10 starts working between front and back filter element weather and leeward side for energy output device that embodiment in the present invention four air cleaner records.
Wherein in Figure of description, the corresponding relation between each label and each structure is followed successively by:
1 is case member, and 11 is orifice plate, and 12 is back-blowing device, and 13 is air intake structure, 2 is filter element, and 21 is expanded PTFE filtration membrane, and 22 is high density porous polyethylene supporter, and 3 is hygrometer, 4 is pressure gauge, and 5 is energy output device, and 6 is control system, and 7 is air compression system.
Detailed description of the invention
Embodiment one as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 6 and Fig. 9.
The method of moisture on air filter element that controls comprises an air cleaner, and wherein air cleaner includes case member 1 and is arranged on the filter element 2 of case member 1 inner chamber.
As shown in Figure 1, case member 1 is the tubular construction of an inside with cavity, in the cavity of this tubular construction, is provided with the orifice plate 11 being provided with some through holes, and the through hole on this orifice plate 11 connects for the installation of filter element 2 just.After this filter element 2 is connected for orifice plate 11, the cavity in case member 1 is divided into two parts, is respectively the pure qi (oxygen) chamber at Primordial Qi chamber, air place to be filtered and filtered air place.And in the present embodiment, described orifice plate 11 and filter element 2 junction are provided with the annular sealing strip contacted with filter element 2 with orifice plate 11 simultaneously.
Simultaneously, in the tubular construction that described case member 1 surrounds, be positioned at the air intake structure 13 this tubular construction outer wall being provided with and offering around tubular construction week body, wherein air intake structure 13 includes the elongated slots of some array arrangements be arranged on case member 1 outer wall week body, and is positioned at each described notch top and is provided with downward-sloping shape eaves body for rain-proof dust-proof.
Above-mentioned air intake structure 13 is communicated with Primordial Qi chamber, and in the present embodiment, filter element 2 is arranged in Primordial Qi chamber after being connected with orifice plate 11, and filter element 2 surrounds by air intake structure 13 on tubular construction outer wall.
Again as shown in Figure 2, the filter element 2 be connected with orifice plate 21 in the present embodiment includes the supporter 22 be made up of high density porous polyethylene, wherein on the windward side of supporter 22, be attached with expanded PTFE filtration membrane 21, described windward side refers in filter element 2 one side of meeting to air to be filtered.Filtering material adopted in the present embodiment, that the mode that expanded PTFE filtration membrane 21 covers method by heat is adhering closely to (it is prior art that this heat covers method) on supporter 22, because expanded PTFE filtration membrane 21 and high density porous polyethylene are close polymer, therefore both associativities are very good, both can realize extraordinary laminating effect.In filter element 2, the aperture of the expanded PTFE filtration membrane 21 of windward side is far smaller than the supporter 22 of lee face, and therefore, supporter 22 only plays a supportive role, and does not participate in filtering.So-called expanded PTFE filtration membrane 21 is by defining fibrous blind hole after stretcher strain on polytetrafluoroethylmaterial material.
Wherein, can control the hole density of expanded PTFE filtration membrane 21 according to the amount of tension of polytetrafluoroethylmaterial material.The specific embodiment of the present invention requires expanded PTFE filtration membrane 21 to reach to treat the filtering accuracy of clearance more than 99% of the dust of particle diameter >=0.1 in filtering gas μm.Found by actual verification, under the filtering accuracy of the clearance of dust treating particle diameter >=0.1 in filtering gas μm more than 99%, under this filtering accuracy, in air cleaner, pure qi (oxygen) chamber should can be implemented in air cleaner work and all scale formation can not occur after 1 year in theory.In addition, from the angle of practical application, in order to ensure compared with under the prerequisite of high filtering precision, produce larger filtration flux with less filter pressure, the specific embodiment of the present invention also further hole density by expanded PTFE filtration membrane 21 is being set as 5 × 10
8individual/cm
2to 30 × 10
8individual/cm
2.By the hole density of expanded PTFE filtration membrane 21 is set in above-mentioned scope, the degree that the filter efficiency of expanded PTFE filtration membrane 21 reaches more satisfactory can be made.Test finds, when the porosity of supporter 22 is all 30%, when the hole density of expanded PTFE filtration membrane 21 is 15 × 10
8individual/cm
2, when filtration pressure difference equals 190Pa, filtration flux is 2m
3/ m
2min.When maintenance filtration flux is constant, the hole density of expanded PTFE filtration membrane 21 improved further, filtration pressure difference then can reduce.On the contrary, when maintenance filtration flux is constant, the hole density of expanded PTFE filtration membrane 21 reduced, filtration pressure difference then can raise.When hole, density is reduced to 5 × 10
8individual/cm
2time, filtration pressure difference is elevated to about 500Pa, the energy consumption of the air cleaner greatly increased.In the present embodiment, therefore be 5 × 10 by the hole density limitations of expanded PTFE filtration membrane 21
8individual/cm
2above.According to the manufacture craft of current expanded PTFE filtration membrane 21, be 30 × 10 by the hole density limitations of expanded PTFE filtration membrane 21
8individual/cm
2below.Further, in the present embodiment, preferably the hole density of expanded PTFE filtration membrane 21 is set as 10 × 10
8individual/cm
2to 25 × 10
8individual/cm
2, meanwhile, in the present embodiment, the porosity of the supporter 22 formed by high density porous polyethylene can be set between 25% to 70%, preferably between 30% to 60%.
Now, can guarantee that filter element 2 treats the clearance of the dust of particle diameter >=0.5 in filtered air μm more than 99%, even can reach the clearance of the dust treating particle diameter >=0.1 in filtered air μm more than 99%, and there is good air penetrability.
Further, in above-mentioned air cleaner, filter element 2 is divided into some groups, and each group is connected with back-blowing device 12 separately, this back-blowing device 12 is arranged in pure qi (oxygen) chamber and carries out reverse gas cleaning to filter element 12.In the present embodiment, simultaneously the blowback work in air cleaner carry out with filtration work.When air cleaner filters, back-blowing device 12 carries out reverse gas cleaning separately successively to each group of filter element 2.
So just can find out, above-mentioned air cleaner can have higher filtering accuracy.But inventor is provided with pressure gauge 4 and compares filtration pressure difference between the weather of filter element 2 and leeward side in the pure qi (oxygen) chamber and Primordial Qi chamber of air cleaner, and the data recorded as shown in Figure 4.Wherein find that described filtration pressure difference fluctuates at about 2500Pa, and night filtration pressure difference higher, daytime, filtration pressure difference was lower, in addition in the diagram, shown filtration pressure difference suddenly increase to more than during 7000Pa work weather be the rainy day.
Like this, on the basis of above-mentioned air cleaner in the present embodiment, also the weather (in Primordial Qi chamber) of filter element 2 is provided with hygrometer 3, and be arranged in Primordial Qi chamber and pure qi (oxygen) chamber and be provided with thermometer (figure does not identify), and the relative humidity in Primordial Qi chamber can be calculated like this.
Simultaneously, be arranged in Primordial Qi chamber and air intake structure 13 phase abutment location, be provided with energy output device 5, energy output device 5 in the present embodiment adopts disc type tubulose or disc type Fin-tube Heat Exchangers to be covered in inside air intake structure 13, wherein be positioned at described energy output device 5 inside and be connected with heat-conducting medium, thus realize carrying out Energy transfer to the air to be filtered by air intake structure 13 and then increasing energy in air molecule to be filtered.
As shown in Figure 9, in the present embodiment, after air cleaner filters, output connects air compression system 7, air compression system 7 is to filtered air acting compression, air internal energy after compression increases, air themperature now after compression generally can reach 55 DEG C ~ 75 DEG C, the described air after overcompression is passed into above-mentioned disc type tubulose or disc type Fin-tube Heat Exchangers and treats filtered air and heat.Simultaneously above-mentioned disc type tubulose or disc type Fin-tube Heat Exchangers and air compression system 7 output junction are provided with valve, when control system 6 control air compression system 7 quit work time, described valve closing.
Like this, in the present embodiment, detected by the humidity in hygrometer 3 pairs of Primordial Qi chambeies, and coordinate thermometer implementing monitoring, when the relative humidity monitoring air to be filtered in Primordial Qi chamber reaches 90%, start energy output device 5 and heat, when detecting that pure qi (oxygen) cavity temperature increases 3 DEG C by thermometer, reduce the rate of heat addition, the temperature of air to be filtered is remained on this temperature and carries out filter operation.
And the back-blowing device 12 at the same time, in air cleaner is carrying out the cleaning of blowback one by one all the time successively to each group of filter element 2.
On the basis of said structure, inventor is provided with control system 6 further in air cleaner.Wherein the data that hygrometer 3 and thermometer detect are transferred to control system 6, analyze the relative humidity drawn in Primordial Qi chamber, when the relative humidity in Primordial Qi chamber reaches 90%, the temperature that the air to be filtered that control system 6 starts air intake structure 13 place in energy output device 5 pairs of Primordial Qi chambeies is heated to air to be filtered raises 3 DEG C.
In the present embodiment, under selection standard atmospheric pressure (0.1013MPa), following three temperature spots carry out testing the relative humidity that air themperature to be filtered raises front and back:
When-10 DEG C, the relative humidity of air 90% can drop to 72.0% after atmosphere temperature rising is to-7 DEG C; When 10 DEG C, the relative humidity of air 90% can drop to 74.9% after atmosphere temperature rising is to 13 DEG C; When 30 DEG C, the relative humidity of air 90% can drop to 76.6% after atmosphere temperature rising 33 DEG C.
After above-mentioned energy output device 5 is started working, filtration pressure difference when can find to record air cleaner filtration work by pressure gauge 4 between filter element 2 weather and leeward side can maintain about 2500Pa, and described filtration pressure difference is less by affecting fluctuation round the clock, even if at rainy weather, also do not have significantly wave phenomenon, the filtration pressure difference wherein between the filter element weather that records of pressure gauge 4 and leeward side as shown in Figure 6.
As shown in Figure 3, in order to strengthen the Stability and veracity of above-mentioned control method further, on the basis of said structure, be connected laying respectively at Primordial Qi chamber with control system 6 with the pressure gauge 4 in pure qi (oxygen) chamber, control system 6 monitors Primordial Qi chamber and pure qi (oxygen) chamber real time filtering pressure reduction by pressure gauge 4, when control system 6 monitor this filtration pressure difference be greater than 4000Pa time, the output temperature of the further higher-energy output device 5 of control system 6.
Embodiment two as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 7 and Fig. 9.
Control equipment that on air filter element, the method for moisture adopts and step in the present embodiment as embodiment one, just the temperature carrying out air to be filtered to be heated to air to be filtered in embodiment one is raised 5 DEG C.
In embodiment two, the intermolecular interior energy of air to be filtered increases more, the intermolecular interior energy of liquid water molecules that is that in corresponding air cleaner, filter element produces or that be about to generation increases more, it is faster that hydrone detaches speed from filter element, but energy output device 5 comparatively speaking overall energy input comparatively embodiment one is larger.
In embodiment two, under selection standard atmospheric pressure (0.1013MPa), following three temperature spots carry out testing the relative humidity that air themperature to be filtered raises front and back:
When-10 DEG C, the relative humidity of air 90% can drop to 62.3% after atmosphere temperature rising is to-5 DEG C; When 10 DEG C, the relative humidity of air 90% can drop to 66.8% after atmosphere temperature rising is to 15 DEG C; When 30 DEG C, the relative humidity of air 90% can drop to 68.9% after atmosphere temperature rising 35 DEG C.
After above-mentioned energy output device 5 is started working, filtration pressure difference when can find to record air cleaner filtration work by pressure gauge 4 between filter element 2 weather and leeward side can maintain about 2300Pa, and described filtration pressure difference is subject to humidity effect round the clock hardly, even if at rainy weather, also can not occur wave phenomenon hardly, the filtration pressure difference wherein between the filter element weather that records of pressure gauge 4 and leeward side as shown in Figure 7.
Embodiment three is real as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 8 and Fig. 9.
Control equipment that on air filter element, the method for moisture adopts and step in the present embodiment as embodiment three, just the temperature carrying out air to be filtered to be heated to air to be filtered in embodiment two is raised 8 DEG C.
In embodiment three, the intermolecular interior energy of air to be filtered increases more, the intermolecular interior energy of liquid water molecules that is that in corresponding air cleaner, filter element produces or that be about to generation increases more, it is faster that hydrone detaches speed from filter element, but energy output device 5 comparatively speaking overall energy input comparatively embodiment two is larger.
In embodiment three, under selection standard atmospheric pressure (0.1013MPa), following three temperature spots carry out testing the relative humidity that air themperature to be filtered raises front and back:
When-10 DEG C, the relative humidity of air 90% can drop to 50.3% after atmosphere temperature rising is to-2 DEG C; When 10 DEG C, the relative humidity of air 90% can drop to 53.7% after atmosphere temperature rising is to 18 DEG C; When 30 DEG C, the relative humidity of air 90% can drop to 55.6% after atmosphere temperature rising 38 DEG C.
After above-mentioned energy output device 5 is started working, filtration pressure difference when can find to record air cleaner filtration work by pressure gauge 4 between filter element 2 weather and leeward side can maintain about 2000Pa, and described filtration pressure difference is subject to humidity effect round the clock hardly, even if at rainy weather, also wave phenomenon can not be there is hardly, and relative to embodiment two, when work runs, average filtration differential pressure is less, filtration pressure difference is more stable, and the filtration pressure difference wherein between the filter element weather that records of pressure gauge 4 and leeward side as shown in Figure 8.
Embodiment four, as shown in Figure 1, Figure 2, shown in Fig. 4 and Figure 10,
The method of moisture on air filter element that controls comprises an air cleaner, and wherein air cleaner includes case member 1 and is arranged on the filter element 2 of case member 1 inner chamber.
As shown in Figure 1, case member 1 is the tubular construction of an inside with cavity, in the cavity of this tubular construction, is provided with the orifice plate 11 being provided with some through holes, and the through hole on this orifice plate 11 connects for the installation of filter element 2 just.After this filter element 2 is connected for orifice plate 11, the cavity in case member 1 is divided into two parts, is respectively the pure qi (oxygen) chamber at Primordial Qi chamber, air place to be filtered and filtered air place.And in the present embodiment, described orifice plate 11 and filter element 2 junction are provided with the annular sealing strip contacted with filter element 2 with orifice plate 11 simultaneously.
Simultaneously, in the tubular construction that described case member 1 surrounds, be positioned at the air intake structure 13 this tubular construction outer wall being provided with and offering around tubular construction week body, wherein air intake structure 13 includes the elongated slots of some array arrangements be arranged on case member 1 outer wall week body, and is positioned at each described notch top and is provided with downward-sloping shape eaves body for rain-proof dust-proof.
Above-mentioned air intake structure 13 is communicated with Primordial Qi chamber, and in the present embodiment, filter element 2 is arranged in Primordial Qi chamber after being connected with orifice plate 11, and filter element 2 surrounds by air intake structure 13 on tubular construction outer wall.
Again as shown in Figure 2, the filter element 2 be connected with orifice plate 21 in the present embodiment includes the supporter 22 be made up of high density porous polyethylene, wherein on the windward side of supporter 22, be attached with expanded PTFE filtration membrane 21, described windward side refers in filter element 2 one side of meeting to air to be filtered.
Further, in above-mentioned air cleaner, filter element 2 is divided into some groups, and each group is connected with back-blowing device 12 separately, this back-blowing device 12 is arranged in pure qi (oxygen) chamber and carries out reverse gas cleaning to filter element 12.In the present embodiment, simultaneously the blowback work in air cleaner carry out with filtration work.When air cleaner filters, back-blowing device 12 carries out reverse gas cleaning separately successively to each group of filter element 2.
In the pure qi (oxygen) chamber and Primordial Qi chamber of air cleaner, be provided with pressure gauge 4 compare filtration pressure difference between the weather of filter element 2 and leeward side, the data recorded as shown in Figure 4.Wherein find that described filtration pressure difference fluctuates at about 2500Pa, and night filtration pressure difference higher, daytime, filtration pressure difference was lower, in addition in the diagram, shown filtration pressure difference suddenly increase to more than during 7000Pa work weather be the rainy day.
In the present embodiment, be provided with control system 6, wherein be respectively arranged with pressure gauge 4 connection control system 6 input at the weather (in Primordial Qi chamber) of filter element 2 and leeward side (in pure qi (oxygen) chamber), and control system 6 output is connected with energy output device 5, energy output device 5 in the present embodiment adopts electric heater, and this electric heater is arranged in Primordial Qi chamber with air intake structure 13 phase abutment location and is covered in inside air intake structure 13.
Filtration pressure difference when profit pressure gauge 4 detects air cleaner filtration work between filter element 2 weather and leeward side, when detecting that described filtration pressure difference reaches 5000Pa, starting energy output device 5 by control system 6 and heating.
When detecting that pure qi (oxygen) cavity temperature increases 3 DEG C by thermometer, reducing the rate of heat addition, the temperature of air to be filtered being remained on this temperature and carries out filter operation.And the back-blowing device 12 at the same time, in air cleaner is carrying out the cleaning of blowback one by one all the time successively to each group of filter element 2.
In the present embodiment, the filtration pressure difference that obtains is detected as shown in Figure 10 by pressure gauge 4, wherein start work when described filtration pressure difference increases suddenly to energy output device during 5000Pa 5, described filtration pressure difference starts to decline, but find, compared to embodiment one, the filtration pressure difference between filter element 2 wind side and leeward side drops to about 3000Pa just to start to tend to steady fluctuation, no longer continues to decline.
Inventor finds after further research, embodiment four is because when described filtration pressure difference reaches 5000Pa compared to the difference main cause that embodiment one occurs, a certain amount of aqueous water has been adhered on filter element 2 surface, can hydration reaction be there is after these aqueous waters are combined with filter cake, thus increase the difficulty that moisture removes from filter element 2.
Claims (10)
1. one kind controls the method for moisture on air filter element, the method depends on the energy output device (5) be arranged on air cleaner and realizes, and step comprises: 1) judge whether the filter element (2) in air cleaner produces maybe may produce aqueous water; 2) if step 1) be judged as YES, then transmit energy by energy output device (5) to the hydrone for the formation of described aqueous water and then promote that these hydrones are separated with filter element (2); 3) hydrone be separated with filter element (2) is detached filter element (2).
2. the method for claim 1, is characterized in that: detect the weather of filter element (2) or the air humidity of leeward side, when detecting humidity value and reaching the first threshold of setting, starts energy output device (5); When the relative humidity described first threshold being set to detected air reaches 80% ~ 95%.
3. the method for claim 1, is characterized in that: described energy output device (5) is a kind of for the heater being about to be heated by the air to be filtered of filter element (2); The heating amplitude of filtered air treated by this heater, and the temperature variation of the filtered air detected with the temperature sensor being arranged on filter element (2) leeward side judges, then for temperature raises 3 DEG C ~ 20 DEG C.
4. method as claimed in claim 3, it is characterized in that: the heating amplitude of filtered air treated by this heater, the temperature variation of the filtered air detected with the temperature sensor being arranged on filter element (2) leeward side judges, then for temperature raises 3 DEG C ~ 8 DEG C.
5. the method for claim 1, it is characterized in that: detect the filtration pressure difference between weather and leeward side when filter element (2) works, when detecting that this filtration pressure difference reaches the Second Threshold of setting, start energy output device (5); When wherein said Second Threshold is for the detected relative filter element of filtration pressure difference (2) normal filtration pressure reduction increase more than 50%.
6. the method for claim 1, it is characterized in that: described filter element (2) comprises the supporter (22) be made up of high density porous polyethylene, woven fabric or nonwoven needling fiber, also include the expanded PTFE filtration membrane (21) being adhering closely to this supporter (22) surface.
7. the method for claim 1, it is characterized in that: described air cleaner is a kind of deduster being used for air compression system (7) front end dedusting, the output of filtered air of air cleaner connects air compression system (7) input, air compression system (7) connected as the heat exchanger of energy output device (5) by compressed air output, this heat exchanger uses the hot air step 2 after air compression system (7) compression) described in for the formation of the hydrone of described aqueous water.
8. the method for claim 1, is characterized in that: described energy output device (5) is microwave generator or electric heater.
9. the method for claim 1, is characterized in that: step 4), this step 4) in step 2) and carry out while or Following step 2) thereafter blowback is carried out to filter element (2).
10. the method for claim 1, it is characterized in that: described air cleaner includes the case member (1) installed for filter element (2), its housing device (1) forms tubular construction, the sidewall of this tubular construction is provided with air intake structure (13), wherein air intake structure (13) is interrupted around tubular construction week body or offers continuously, be positioned at this air intake structure (13) place to be provided with energy output device (5) and to act on this air intake structure (13), filter element (2) is enclosed in tubular alternating temperature band wherein by this air intake structure (13) formation.
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| CN201610023863.XA CN105477943A (en) | 2016-01-14 | 2016-01-14 | Method for controlling moisture on air filtering elements |
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|---|---|---|---|
| CN201610023863.XA CN105477943A (en) | 2016-01-14 | 2016-01-14 | Method for controlling moisture on air filtering elements |
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| CN111085052A (en) * | 2019-12-30 | 2020-05-01 | 徐州工程学院 | Microwave-assisted drying self-cleaning cloth bag dust remover |
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