CN205308032U - Filter element blowback protection device - Google Patents

Abstract

The utility model discloses a filter element blowback protection device, including setting up in the inside blowback protection tube of filter element, leave the clearance between blowback protection tube and the filter element inner wall. Through addding in the filter element the utility model discloses filter element blowback protection device for the filter element obtains the protection when the blowback, avoid the filter element to take place to damage, has reduced the economic loss that frequent change filter element caused from this.

Description

Filter element blowback protection device

Technical field

This utility model relates to gas filtration field, is specifically related to a kind of filter element blowback protection device.

Background technology

Filtration filter element is ingredient particularly important in gas-filtering device, and its serviceability determines quality and the life-span length of a gas-filtering device. The applicant finds in practice, filtration filter element its surface after used a period of time is it occur frequently that damage phenomenon, especially the filter element that some materials are comparatively soft, the filter element damaged cannot continue on for filtering, therefore can only replacing new filter element, the new filter element of a large amount of replacement necessarily causes that enterprise's production cost increases.

Such as, the applicant have developed a kind of tubular filter filter element adopting flexible, porous metal membrane material to constitute voluntarily, this filtration filter element made of soft, its filtration filter element filtration flux that relatively rigid material is constituted is bigger, but slightly weak compared with rigid material on the working strength of material, this kind of filtration filter element easily occurs above-mentioned damage phenomenon in use for some time.

Utility model content

This utility model provides a kind of filter element blowback protection device protecting filtration filter element surface not affected by blowback.

In order to solve above-mentioned problem of the prior art, this utility model realizes by the following technical solutions:

This utility model filter element blowback protection device includes the blowback protection pipe being arranged at filter element interior, leaves gap between described blowback protection pipe and filter element inwall. Being damaged the reason of situation to find out filter element, applicant has carried out many experiments for the use procedure of filter element, test result indicate that blowback operation when main reason is that cleaning filter element causing on filter element a certain section to be damaged. In gas filtration process, filter element is after passing through for a long time to the gas filtration containing dust or other solid impurity, its surface can deposit a metafiltration cake, thickening gradually along with this metafiltration cake, the filter efficiency of filtration filter element can be gradually lowered, therefore, in order to recover the filter efficiency of filtration filter element, it is necessary to set up a blowback system connected with defecator in whole filtration system. When filter assemblies being carried out blowback by blowback system, most of filter cake of filter element surface can be cleaned out, but there is high pressure in the regional area that blowback air is known from experience at filter element interior, filter element after repeatedly blowback operates easily is damaged at regional area high pressure occur, causes shorten the service life of filter element. This utility model is by arranging a blowback protection pipe at above-mentioned filter element interior; the region entering the pressure that produces inside filter element of purge gas higher is protected; thus prevent the high pressure damage for filter element interior region, it is clear that filter element here refers to the filter element of outside filtering type. Leaving gap between blowback protection pipe and filter element makes the gas needing to filter can be entered by gap; during blowback, filter element is carried out blowback by gap by purge gas; here protected object can be the filter element of rigid; it can also be the filter element of some materials comparatively softness; the filter element that such as textile material or flexible, porous metal membrane material are constituted, the shape of filter element can be cylindrical shape, square tube, filter bag or other is polygon-shaped.

Protect the further improvement of device as above-mentioned filter element blowback, described blowback protection pipe is fixed on the upper position of filter element interior. Filter element interior is subject to the bigger region of blowback pressure in actual use needs to be determined by detection in advance, the applicant by carrying out blowback stress test discovery to various sizes of filter element, nearly all filter element, when carrying out blowback operation, is subject to the top generally within filter element, the blowback pressure bigger region inside it.

Protect the further improvement of device as above-mentioned filter element blowback, inside described blowback protection pipe, be provided with the even gas distribution device so that being uniformly distributed in filter element interior from effluent air in blowback protection pipe. For filter element, the filter element that especially some length are longer, when carrying out blowback, after air-flow enters filter element interior, always produce high pressure in some region of filter element inwall, pressure is more and more less afterwards, causes that the blowback effect of filter element further part is unsatisfactory. Even gas distribution device is adopted to make to protect the internal purge gas flowed out of pipe to uniformly act on the inwall of subsequent filter element segment from blowback; optimize purge gas blowback effect on the one hand; the filter cake being deposited on filter element is fully cleared up, prevents filter element inwall local to bear high pressure and be damaged on the other hand further.

As the further improvement of above-mentioned filter element back-blowing device, described even gas distribution device being provided with mean for the passage of gas circulation, described passage is divided into the contraction section of front portion and the horizontal segment at rear portion along gas circulating direction. Circulation style in air-flow passage on even gas distribution device is similar to Venturi effect, air-flow is maximum at the intersection flow velocity of contraction section Yu horizontal segment, the applicant is experimentally confirmed, the pressure stability that produced everywhere at filter element interior by the air-flow of this passage, uniformly, do not have certain and produce the situation of hypertonia, make blowback effect more preferably uniform, and be not easily caused filter element damage.

One as above-mentioned contraction section is preferred, and the angle of throat of described contraction section is 20-26 °. In this angular range, purge gas flowing is the most steady, and purge gas distribution situation in filter element pipeline is best, and the stream pressure that each point of filter element inner-walls of duct is subject to is the most uniform.

For the concrete structure of even gas distribution device, described even gas distribution device is the interior pipe being arranged at blowback protection within pipe, and said inner tube includes along the front body of gas flow direction contraction and the rear body in straight-tube shape. Air-flow through interior pipe passage gradually from the coarse to fine; eventually pass through rear body to discharge; the applicant is experimentally confirmed; after air-flow protects pipe flow to go out from the blowback having additional above-mentioned interior pipe, purge gas flows more steady so that blowback protection pipeline section and each stream pressure suffered by point of filter element section inwall after blowback protection pipe are more uniform; this simple in construction; easy for installation, make blowback effective simultaneously, and filter element obtains further protection.

One as above-mentioned interior pipe is preferred, and said inner tube is arranged at the air inlet place of blowback protection pipe. Interior pipe is arranged at inside blowback protection pipe so that the air-flow having just enter into blowback protection pipe rapidly be uniform, it is ensured that air-flow further part in filter element steadily circulates.

The further improvement of device is protected as above-mentioned filter element blowback; the end face of described blowback protection pipe one end circumferentially extending go out a circle make to be formed between blowback protection pipe outer wall and filter element inwall the outer in gap, described outer is fixed on filter element inwall for one week by welding or bonding way. When being filtered element blowback; the purge gas that pipe flow goes out is protected to be full of follow-up whole filter element section from blowback; therefore protect the blowback air that pipe flow goes out to know from experience from blowback enter the gap formed between blowback protection pipe outer wall and filter element and protect the filter element inwall that pipe is corresponding to flow out via this gap from blowback; so that the filter element section corresponding to blowback protection pipe also is able to be cleared up; and partial high pressure will not be produced in this section, it is to avoid this section is damaged.

Further, described filter element is tubular filter element so that is arranged on the protection pipe of the blowback within tubular filter element and more agrees with.

Further, described blowback protection pipe is arranged at the filter element interior that flexible, porous metal film is constituted. The filter element material that flexible, porous metal film is constituted is comparatively soft compared with the filter element that rigid material is constituted; therefore support frame is had additional when it constitutes filter element inside it; prevent it from deforming in blowback process; but owing to himself physical property limits; the filter element being made up of it is being susceptible to local damage after repeatedly blowback, it is therefore desirable to blowback protection pipe is arranged on localized high pressure areas and it is protected. Here flexible, porous metal forming can for flexible, porous metal forming that the applicant's application number is 201410609038.9, described porous metal film is the thin slice being made up of the metal polyporous material that solid solution alloy is matrix phase, the average pore size of described thin slice is 0.05-50 μm, porosity is 40%-70%, thickness is 5 μm-200 μm, its working strength is high compared with the filter element that textile material is constituted to use flexible, porous metal film to be advantageous in that, its filtration flux is big compared with the filter element that rigid material is constituted.

Further, described tubular filter element is the metal filter bag being made up of flexible, porous metal forming.

By setting up this utility model filter element blowback protection device in filter element so that filter element is protected when blowback, it is to avoid filter element is damaged, and thus reduces and often changes the economic loss that filter element causes.

Accompanying drawing explanation

Below by way of accompanying drawing and detailed description of the invention, the utility model is described in further detail.

Fig. 1 is the front view of this utility model filter element blowback protection device.

Fig. 2 is the top view of this utility model filter element blowback protection device.

Fig. 3 is this utility model filter element blowback protection device use state diagram in filter element.

Detailed description of the invention

As figures 1 and 2 show that a kind of filter element blowback protection device, pipe 2 is protected including a cylindric blowback, when carrying out blowback, the upper end of described blowback protection pipe 2 is as the air inlet of purge gas, its lower end is as the gas outlet of purge gas, also include an even gas distribution device, described even gas distribution device is an interior pipe 3 of blowback protection pipe 2 inner upper end socket, front body 310 that this interior pipe 3 includes the inverted cone shape on top and the rear body 320 being connected with front body 310 with bottom, the angle α of the front body 310 of inverted cone shape is 25 °, angle α in Fig. 1 refers to the angle between two buses of inverted cone, before interior pipe 3 inner passage, the upper surface of body 310 protects the upper surface of pipe 2 to flush with blowback, namely whole interior pipe 3 is positioned at the upper port of blowback protection pipe 2, the end face of air inlet one end of described blowback protection pipe 2 extends outward outer 210 in one week, described blowback protection pipe 2 is stainless steel material with interior pipe 3 and makes, can pass through to be weldingly connected between interior pipe 3 and blowback protection pipe 2, as shown in Figure 3, claimed object is a cylindric filter element 1 in this embodiment, the length of filter element 1 is 6m, filter element 1 is made up of flexible, porous metal film, described flexible, porous metal film is the thin slice being made up of the metal polyporous material that solid solution alloy is matrix phase, the average pore size of described thin slice is 0.05 μm, porosity is 70%, thickness is 5 μm, blowback protection pipe 2 is positioned at the inside of filter element 1, filter element 1 character being made up of flexible, porous metal film is soft, described outer 210 makes to leave gap between blowback protection pipe 2 and filter element 1 inwall, learn in filter element blowback process by many experiments, the inwall of this filter element 1 is maximum 400 μm-800 μm section pressure experienced, namely this section of filter element determines the service life of whole filter element 1, thereby determine that the length of blowback protection pipe 2 is 400 μm and is fixed on the position of 400 μm-800 μm of filter element 1 inwall, blowback protection pipe 2 is fixed on the internal maximum region that is under pressure of filter element 1 and thus plays the effect of protection filter element 1, fixed form can adopt clamping can also adopt welding or bonding.

When filter element 1 is carried out blowback; for in the system of blowback without additionally arranging Venturi tube; in the gas air inlet pipe input air-purifying chamber through defecator top; the purge gas passed into is full of subsequent filter element segment after protecting device effect by above-mentioned filter element blowback, protects the type of flow in the even gas distribution device of device to be similar to Venturi effect in filter element blowback. The pressure that purge gas produces on each aspect of subsequent filter element segment is balanced, and repeatedly after blowback, filter element remains in that intact, it does not have be damaged phenomenon, and blowback effect is more preferably, and the dust of filter element surface deposition is comparatively removed thoroughly.

The applicant has done the experiment to blowback influential effect of several groups of learning gas uniform devices, when ensureing that other condition is constant, one group does not adopt above-mentioned gas uniform device, additionally several groups adopt even gas distribution device, test result indicate that each pressure experienced of filter element inwall not adopting even gas distribution device is unbalanced, there is the crest that force value fluctuating margin is bigger in the pressure drawn out-filter element length curve, have employed a few suite lines of above-mentioned gas uniform device on the contrary and all compare steadily, show the force value equilibrium that each point of filter element inwall is suffered, blowback effect, on the latter's filter element, each position dust is cleared up more thorough.

Certainly; the structure of filter element blowback protection device is not limited to above-mentioned embodiment; through checking; in blowback process; blowback pressure is different; region maximum pressure occur also can be moved; pressure is more big; distance filter element oral area is more remote, and scope is wider, and the length of filter element is different; the region of the maximum pressure produced in blowback process also can be different; so according to different blowback pressure, the length also important affair of blowback protection pipe first carries out experimental verification and makes corresponding adjustment, with practical requirement.

Claims (10)

1. filter element blowback protection device, it is characterised in that include being arranged at blowback protection pipe (2) that filter element (1) is internal, leave gap between described blowback protection pipe (2) and filter element (1) inwall.

2. filter element blowback protection device as claimed in claim 1, it is characterised in that the upper position that filter element (1) is internal is fixed in described blowback protection pipe (2).

3. filter element blowback protection device as claimed in claim 1; it is characterized in that, the internal even gas distribution device being provided with so that being uniformly distributed in filter element interior from blowback protection pipe (2) interior effluent air of described blowback protection pipe (2).

4. filter element blowback protection device as claimed in claim 3, it is characterised in that being provided with mean for the passage of gas circulation on described even gas distribution device, described passage is divided into the contraction section of front portion and the horizontal segment at rear portion along gas circulating direction.

5. filter element blowback protection device as claimed in claim 4, it is characterised in that the angle of throat (α) of described contraction section is 20-26 °.

6. filter element blowback protection device as claimed in claim 4; it is characterized in that; described even gas distribution device is be arranged at the interior pipe (3) that blowback protection pipe (2) is internal, and said inner tube (3) includes along the front body (310) of gas flow direction contraction and the rear body (320) in straight-tube shape.

7. filter element blowback protection device as claimed in claim 6, it is characterised in that said inner tube (3) is arranged at the air inlet place of blowback protection pipe (2).

8. filter element blowback protection device as claimed in claim 1; it is characterized in that; the end face of described blowback protection pipe (2) one end circumferentially extending go out a circle make to be formed between blowback protection pipe (2) outer wall and filter element (1) inwall the outer (210) in gap, described outer is fixed on filter element (1) inwall for (210) one weeks by welding or bonding way.

9. filter element blowback protection device as claimed in claim 1, it is characterised in that described filter element (1) is tubular filter element.

10. filter element blowback protection device as claimed in claim 9, it is characterised in that described tubular filter element is the metal filter bag being made up of flexible, porous metal forming.