CN1229162C - Gas eductor for pulse reverse blowing system to remove ash from filter and its filter - Google Patents
Gas eductor for pulse reverse blowing system to remove ash from filter and its filter Download PDFInfo
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- CN1229162C CN1229162C CN 01115774 CN01115774A CN1229162C CN 1229162 C CN1229162 C CN 1229162C CN 01115774 CN01115774 CN 01115774 CN 01115774 A CN01115774 A CN 01115774A CN 1229162 C CN1229162 C CN 1229162C
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- injector
- annular groove
- filter
- internal diameter
- diffuser
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Abstract
The present invention discloses a gas ejector for a pulse reverse blowing ash removing system which comprises a cylindrical shell body, wherein the shell body comprises an ejection section and a diffusion section from an inlet to an outlet along the axial direction; the inner diameters of the ejection section are gradually reduced; the inner diameters of the diffusion section are gradually increased. An annular groove can be also arranged on the inner wall of the shell body; the edge of the annular groove forms an annular blade. The ejector provided by the present invention can greatly decrease the resistance to gas in the process of removing ash by pulse and can reduce the pressure difference of the inside and the outside of a pipe as much as possible in the process of pressure reduction and reflux; thereby, the ash removing effect is good, and the service life of the ejector is long.
Description
Technical field
The invention belongs to the gas solid separation technical field, relate to a kind of filter, gas eductor for pulse reverse blowing system to remove ash and filter thereof that especially a kind of filter is used.
Background technology
The gas solid separation technology is widely used in industries such as petrochemical industry, coal fired power generation, metallurgical process and environmental protection, and its purposes mainly contains two: the one, realize gas purification, and the 2nd, in order to reclaim the solid particle in the dusty gas.At present, the normal equipment that adopts of gas solid separation is pneumatic filter, and it comprises the screen pipe (bag) that a usefulness filtering material is made, screen pipe or filter bag one end opening, and the other end is a closing form.In filter process, dusty gas is entered in the screen pipe by the hole on the filtering material by the outer surface of screen pipe under the effect of pressure reduction, and the solid particle in the gas is trapped within on the outer wall of screen pipe, and clean gas is discharged by the openend of screen pipe.After filtering a period of time, the accumulation of the solid particle on the screen pipe outer wall increases the circulating resistance of screen pipe, the rate of filtration reduces, at this moment, will utilize the reverse gas cleaning system to screen pipe internal spray gases at high pressure, gas passes the screen pipe tube wall and outwards flows, and will be trapped in solid particle dust layer on the tube wall into ash bucket of filter bottom that blows off.Mouth of pipe place at screen pipe is typically provided with injector.It is the simplified of cylindrical shape solid wall surface that existing injector is generally an inwall.
The reverse gas cleaning process can be divided into two stages, and the phase I is the pulse dust cleaning process, and in this process, wishing has purge gas as much as possible to enter the screen pipe openend in the unit interval, to improve the efficient of reverse gas cleaning.But, the inner surface of the injector of the openend setting of existing screen pipe is smooth solid wall surface, when purge gas flows through injector in the reverse gas cleaning process, can form a detention layer near the wall place, it forms bigger resistance to the gas that enters, and cylinder shape inner wall is also relatively poor in the face of the effect of injection and diffusion in addition; Second stage is the reduced-pressure backflow stage, when the approaching end of blowback, purge gas speed reduces gradually, till to zero, in this process, the screen pipe pressure inside is less than the pressure of its outside, at this moment, near the screen pipe outer wall gas can occur by the pipe outside by the backflow phenomenon of tube wall to the pipe flows inside, this backflow can make the solid particle that blows off from the pipe outer wall of screen pipe be deposited in again on its outer wall, even the part granule is worn be embedded in the tube wall, and this can have influence on the filter quality and the efficient of next filtration cycle, simultaneously, also can reduce the service life of screen pipe greatly.Screen pipe of the prior art, especially those rigidity chimney filters of under hot conditions, working, because the existence of the problems referred to above, its reverse gas cleaning effect is undesirable, and this directly has influence on the commercial applications of high-temperature gas filter.
Summary of the invention
The objective of the invention is to improve the deficiencies in the prior art.Provide a kind of in the pulse dust cleaning process injection and diffusion effective, resistance to gas reduces greatly, in the reduced-pressure backflow process, make near the gas eductor for pulse reverse blowing system to remove ash from filter that back-flow velocity reduces greatly the chimney filter outer wall: in addition, also provide the filter that uses above-mentioned injector.
The object of the present invention is achieved like this:
This gas ejector comprises a barrel-type casing, and this housing comprises that to outlet injection section and diffuser, the internal diameter of described injection section have descending variation warship rule by its import on its axis direction, and the internal diameter of described diffuser has ascending Changing Pattern; Be provided with at least one annular groove on the inwall of described injector housing, the edge of described annular groove forms annular blade; Described annular groove two sides are curvilinear surface.
The injection section of the descending variation of internal diameter internal diameter by this injector inboard when gas flows through reduces to locate to form than the low low-pressure area of outer inlets place pressure, and this helps improving air inlet speed and air inflow.And in diffuser formation higher-pressure region in pipe of the ascending variation of internal diameter of its back, the pressure in itself and the screen pipe outside forms bigger pressure reduction, the gas that helps increasing in the chimney filter passes the speed that the chimney filter wall outwards flows, and has improved the reverse gas cleaning efficient in the pulse dust cleaning process.The injector that has annular groove and annular blade on this inwall can make the gas-flow resistance in inwall boundary layer reduce greatly in the pulse dust cleaning process, air inlet speed improves greatly in deashing process, simultaneously, can make gas when the Purge gas collection chamber is discharged, form a large amount of vortexs in by chimney filter at the annular groove described in the reduced-pressure backflow process, thereby increase air resistance greatly, the similar check valve that does not allow gas discharge of its effect by chimney filter, reduced the difference of gas pressure and the interior gas pressure of chimney filter in the injection organ pipe, reduced the backflow of gas, thereby, avoided that granule is deposited in the chimney filter outer wall surface again outside the chimney filter because of the backflow effect causes when deashing closes to an end, therefore, can improve the effect of pulse backblowing deashing.
The diffuser length of this injector and the ratio of injection segment length are preferably 3～8 times: injection section inner surface is a curve, optional helix, circular arc etc., and diffuser then is the conical surface.
Described annular groove two sides are preferably curvilinear surface, multiple curve such as optional circular arc, and the width of each groove outer radius can be unequal, changes between 2～50mm, and its preferred value is 3～15mm.
The annular blade that forms between the adjacent described annular groove all tilts to the port of export of injector, and the axial angle of the concave surface of described trunnion section annular groove or its tangent line and injector is that the angle of the annular groove concave surface of diffuser or its tangent line and diffuser inner conical surface is α.The maximum of α should be less than 90, and preferred value is 30～80 degree.
Described annular groove is bigger in its degree of depth of injection section, and towards the direction of diffuser, the degree of depth of described annular groove can be more and more shallow.Like this, the darker annular groove delay to gas when blowback finishes of injection section has better effect, and it is fairly simple easy at the more shallow annular groove of diffuser it to be made.
The number of described annular groove is preferably 2～20, and it can be uniform on the inwall of injector, also can injection section and/or trunnion section arrange density greater than other the section.
A kind of filter that has injector, include screen pipe and injector, described screen pipe has an openend, its other end is an enclosed construction, described injector is located at the described open end of described screen pipe, and described injector is a housing, and housing comprises injection section and diffuser by import to outlet on its axis direction, described injection section internal diameter has descending Changing Pattern, and the internal diameter of described diffuser has ascending Changing Pattern; Be provided with at least one annular groove on the inwall of described injector housing, the edge of described annular groove forms annular blade; Described annular groove two sides are curvilinear surface.
The length of injector and the screen pipe that is connected with it the ratio regular meeting of internal diameter have influence on the effect of injector; The injector total length is preferably 1～3 times of used chimney filter (bag) internal diameter, and injector is too short, and its injection and diffusion action are just smaller, but it longly then can increase filter length.
Injector preferably is provided with the constant trunnion section of an internal diameter between injection section and diffuser, the internal diameter of its internal diameter and screen pipe or filter bag also preferably has a numerical value to require: the internal diameter of injector trunnion section is 0.2～0.8 of chimney filter (bag) internal diameter: if the pressure drop when the too small meeting of trunnion section internal diameter causes filtering is too big: excessive then reduce the injection effect.
The external diameter of described annular groove then depends on the injector riding position, if injector is placed in the chimney filter, then the groove external diameter should be less than the internal diameter of chimney filter (bag); If be installed on the mouth of pipe in the chimney filter openend outside, then the groove external diameter should be 0.5～2 times of chimney filter (bag) internal diameter.
Gas eductor for pulse reverse blowing system to remove ash provided by the invention, injection section by its internal diameter varies and the annular groove on diffuser and the inwall and annular blade can reduce in the pulse dust cleaning process it greatly to the resistance of gas, the inside and outside pressure reduction of pipe is reduced as far as possible, therefore, this injector has the following advantages:
1, can significantly increase the air velocity of pulse dust cleaning or load-bearing, improve the pulse backblowing ash-removal effect.
2, can significantly reduce near the backflow phenomenon of screen pipe outer wall, realize the stable circulation regeneration of screen pipe.
3, this injector is simple in structure, and is easy for installation, can directly substitute existing injector, is convenient to commercial Application.
4, this injector is applied widely, can be used for the cloth envelop collector under the normal temperature, also can be used for the rigid filter under the hot conditions, as powder metallurgy filter and refractory ceramics filter etc.This injector especially has the effect of good raising ash-removal effect for the filter that those cost an arm and a leg, the rigid filter element of processed complex is formed.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the pneumatic filter schematic diagram
Fig. 2 is the pulse cleaning system schematic diagram
Fig. 3 is the structural representation of monoblock type injector provided by the invention
Fig. 4 is the structural representation of split type injector
The specific embodiment
Be illustrated in figure 1 as pneumatic filter 1, be provided with screen pipe 2 therein, it has the cylindrical shell of openend other end sealing for an end of being made by filter medium, connect firmly an end of injector 3 provided by the invention in the open end sealing of screen pipe 2, the other end of injector 3 connects the pulse backblowing device, as shown in Figure 2.
The structure of injector 3 as shown in Figure 3, it is made up of injection section 33, trunnion section 34 and diffuser 35 on its axis direction to outlet 32 import 31, the internal diameter of injection section 33 has descending Changing Pattern, the internal diameter of diffuser 35 has ascending Changing Pattern, and the internal diameter of trunnion section 34 is constant.
Injector 3 total lengths are 1.5 times of used chimney filter internal diameter.
The internal diameter of injector trunnion section is 0.6 times of chimney filter internal diameter.
The ratio of the length of the diffuser 35 of injector 3 and the length of injection section 33 is 5; Injection section 33 inner surfaces are circular curve, and 35 of diffusers are the conical surface.
Uniform 7 annular grooves 36 on the inwall of injector 3 housings, the edge of annular groove 36 forms annular blade 37.
Be installed in the injector (as shown in Figure 2) on the mouth of pipe in the chimney filter openend outside, the external diameter of groove 36 is 0.5 times of chimney filter (bag) internal diameter, also can be 1 times or 1.2 times or 1.5 times.Be placed in the chimney filter if the riding position of injector has changed as injector, then the groove external diameter should be less than the internal diameter of chimney filter (bag).
The annular blade 37 that forms between the adjacent annular groove 36 all tilts to the port of export of injector, the axial angle of the concave surface of trunnion section 34 annular grooves or its tangent line and injector is defined as α, and the angle of the annular groove concave surface of diffuser or its tangent line and diffuser inner conical surface also is α.The maximum of α should be less than 90, and preferred value is 30 degree, 40 degree, 50 degree, 70 degree or 80 degree.
Injector 3 can be a split-type structural as shown in Figure 3, also can be monolithic construction as shown in Figure 4.
Claims (12)
1, a kind of gas eductor for pulse reverse blowing system to remove ash, comprise a barrel-type casing, described housing comprises injection section and diffuser by import to outlet on its axis direction, described injection section internal diameter has descending Changing Pattern, and the internal diameter of described diffuser has ascending Changing Pattern; It is characterized in that: be provided with at least one annular groove on the inwall of described injector housing, the edge of described annular groove forms annular blade; Described annular groove two sides are curvilinear surface.
2, injector according to claim 1 is characterized in that: the diffuser length of described injector and the ratio of injection segment length are 3～8 times.
3, injector according to claim 1 is characterized in that: injection section inner surface is a curve, and diffuser then is the conical surface.
4, injector according to claim 1, it is characterized in that: the width of the described annular groove outer radius of each of described injector is unequal, change between 2～50mm: described annular groove is bigger in its degree of depth of injection section, and towards the direction of diffuser, the degree of depth of described annular groove is more and more shallow; The number of described annular groove is 2～20, on the inwall of injector uniform or injection section and/or trunnion section arrange density greater than other the section.
5, injector according to claim 1 is characterized in that: the width of the described annular groove outer radius of each of described injector is 3～15mm; The width of each groove outer radius is unequal, injection section and trunnion section, and the width of the groove outer radius of close import department is less.
6, injector according to claim 1, it is characterized in that: the annular blade that forms between the adjacent described annular groove all tilts to the port of export of injector, the angle α that the concave surface of described trunnion section annular groove or its tangent line and injector are axial, the angle of the annular groove concave surface of diffuser or its tangent line and diffuser inner conical surface is α, and the maximum of α is less than 90 degree.
7, injector according to claim 6 is characterized in that: described angle is that α is 30～80 degree.
8, a kind of filter that has injector, include screen pipe and injector, described screen pipe has an openend, its other end is an enclosed construction, described injector is located at the described open end of described screen pipe, described injector is a housing, housing comprises injection section and diffuser by import to outlet on its axis direction, described injection section internal diameter has descending Changing Pattern, the internal diameter of described diffuser has ascending Changing Pattern, it is characterized in that: be provided with at least one annular groove on the inwall of described injector housing, the edge of described annular groove forms annular blade; Described annular groove two sides are curvilinear surface.
9, filter according to claim 8 is characterized in that: described injector total length is 1～3 times of used chimney filter internal diameter.
10, filter according to claim 8 is characterized in that: described injector is provided with the constant trunnion section of an internal diameter between injection section and diffuser, the internal diameter of described injector trunnion section is 0.2～0.8 of a chimney filter internal diameter.
11, filter according to claim 8 is characterized in that: described injector is placed in the described chimney filter, and described annular groove external diameter is less than the internal diameter of chimney filter.
12, filter according to claim 8 is characterized in that: described injector is installed on the mouth of pipe in the described chimney filter openend outside, then the groove external diameter be the chimney filter internal diameter 0.5-2 doubly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115774 CN1229162C (en) | 2001-06-25 | 2001-06-25 | Gas eductor for pulse reverse blowing system to remove ash from filter and its filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115774 CN1229162C (en) | 2001-06-25 | 2001-06-25 | Gas eductor for pulse reverse blowing system to remove ash from filter and its filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1393275A CN1393275A (en) | 2003-01-29 |
| CN1229162C true CN1229162C (en) | 2005-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01115774 Expired - Fee Related CN1229162C (en) | 2001-06-25 | 2001-06-25 | Gas eductor for pulse reverse blowing system to remove ash from filter and its filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1229162C (en) |
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2001
- 2001-06-25 CN CN 01115774 patent/CN1229162C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1393275A (en) | 2003-01-29 |
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Granted publication date: 20051130 Termination date: 20110625 |