CN109621569B - Self-direction-regulating periodic pulse jet nozzle and filter - Google Patents
Self-direction-regulating periodic pulse jet nozzle and filter Download PDFInfo
- Publication number
- CN109621569B CN109621569B CN201910023706.2A CN201910023706A CN109621569B CN 109621569 B CN109621569 B CN 109621569B CN 201910023706 A CN201910023706 A CN 201910023706A CN 109621569 B CN109621569 B CN 109621569B
- Authority
- CN
- China
- Prior art keywords
- filter
- rotating ring
- self
- jet nozzle
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000000737 periodic effect Effects 0.000 title claims abstract description 56
- 238000007664 blowing Methods 0.000 claims abstract description 132
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 19
- 239000000428 dust Substances 0.000 claims description 29
- 238000004140 cleaning Methods 0.000 claims description 26
- 230000006835 compression Effects 0.000 claims description 23
- 238000007906 compression Methods 0.000 claims description 23
- 238000004891 communication Methods 0.000 claims description 3
- 238000011161 development Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims 2
- 230000009471 action Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 110
- 230000000694 effects Effects 0.000 description 16
- 238000001914 filtration Methods 0.000 description 15
- 238000003825 pressing Methods 0.000 description 14
- 238000011010 flushing procedure Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 7
- 230000035485 pulse pressure Effects 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 230000008929 regeneration Effects 0.000 description 6
- 238000011069 regeneration method Methods 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- 230000008021 deposition Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 238000002309 gasification Methods 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229940090046 jet injector Drugs 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
-
- 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
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2411—Filter cartridges
-
- 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
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
- B01D46/72—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with backwash arms, shoes or nozzles
Abstract
The invention provides a self-direction-adjusting periodic pulse jet nozzle and a filter. The self-alignment periodic pulse jet nozzle comprises a body and a rotating ring; the main body is provided with a main channel and a direction-adjusting channel positioned outside the main channel, and the central axis of the outlet end of the direction-adjusting channel is inclined towards the central axis direction of the main channel; the rotating ring is arranged at the upper end of the body and corresponds to the main channel, and a notch is arranged on the rotating ring; a plurality of airfoil blades are arranged in the rotating ring; the pulse back blowing gas can enter the main channel through the rotating ring, and the plurality of airfoil blades generate rotating moment under the action of the pulse back blowing gas so as to drive the rotating ring to rotate; in the rotating process of the rotating ring, when the notch is communicated with the inlet end of the direction-adjusting channel, part of pulse back-blowing gas enters the direction-adjusting channel. The embodiment of the invention can effectively solve the problems of uneven ash removal among different filter pipes in the circumferential direction in a single filter unit and uneven ash removal at different positions of the single filter pipe in the length direction.
Description
Technical Field
The invention relates to the technical field of gas-solid separation, in particular to a self-direction-adjusting periodic pulse jet nozzle and a filter applying or configured with the self-direction-adjusting periodic pulse jet nozzle.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
In the industries of petroleum catalytic cracking, coal chemical industry, biomass gasification, garbage incineration, pyrolysis, metallurgy and the like, high-temperature dust-containing gas is often generated. In order to meet the requirements of different technological processes and environmental emission standards, the high-temperature dust-containing gas needs to be purified. The high temperature gas purifying technology refers to the separation of solid particles in gas at a temperature above 260 ℃ and the separation of sulfur dioxide (SO) contained in high temperature gas 2 ) Nitrogen Oxides (NO) x ) And removing trace alkali metal, trace heavy metal and other components. Aiming at the separation of solid particles in dust-containing gas, the separation is usually realized by a high-temperature filter, the physical sensible heat, chemical latent heat and power energy of the gas can be utilized to the greatest extent, the energy utilization rate is improved, the process is simplified, and the equipment investment is saved.
The core of the high-temperature filter is a rigid filter element such as a sintered metal filter pipe or a ceramic filter pipe which is prepared from a porous metal material or a porous ceramic material. The sintered metal filter tube has the advantages of good mechanical strength, toughness, machining performance and the like; the sintered ceramic filter tube has the advantages of high temperature resistance, corrosion resistance, small thermal expansion coefficient and the like, and simultaneously has better resistance property, filtering precision and filtering efficiency, so the sintered ceramic filter tube is widely applied to the field of high-temperature gas purification.
After the high-temperature dust-containing gas enters the filter, solid particles in the dust-containing gas are deposited on the outer surface of the filter element due to inertial collision, direct interception, brownian diffusion and other reasons to form a stable and compact dust layer, and the purified gas enters the subsequent process through a porous channel in the filter element. Wherein the gas filtered by the filter element is referred to as clean gas, and the concentration of solid particles in the gas is small. As the filtration process progresses, the dust layer on the outer surface of the filter element gradually thickens, so that the pressure drop of the filter is continuously increased, the running resistance of the device is increased, and after the pressure drop of the filter is increased to a certain range or the filter runs for a certain time, the cyclic regeneration of the filter element needs to be realized by adopting a pulse back flushing mode. When in pulse back blowing, high-pressure high-speed back blowing gas enters from the opening end of the filter pipe, the speed energy head of the high-pressure high-speed back blowing gas is gradually converted into pressure energy head in the axial flow process of the filter pipe, the pressure energy head flows out radially through the porous channels of the filter element, the transient energy of the high-pressure high-speed back blowing gas overcomes the adhesion force between the dust layer and the outer surface of the filter element so as to peel off and remove the dust layer, the pressure drop of the filter element is suddenly reduced, and the pressure drop of the filter element is basically restored to the state during initial filtration, thereby realizing the cyclic regeneration of the performance of the filter element.
The high-efficiency pulse back-flushing mode is an important way for realizing the performance cyclic regeneration of the filter element, and the advantages and disadvantages of the ash removal performance determine whether the high-temperature gas filter can stably operate for a long period. Therefore, the design of the pulse back-blowing ash removal system is particularly important.
The common pulse back-flushing system mainly comprises a compressor, an air storage tank, a pulse back-flushing valve, a pressure regulating valve, a back-flushing pipeline, a nozzle, an ejector and the like, wherein the structures of the nozzle and the ejector and reasonable matching between the nozzle and the ejector are key for determining the pulse back-flushing performance. In the prior art, in order to simplify the structure of a back-blowing system and reduce the energy consumption of back-blowing gas, in the coal chemical poly-generation technology represented by Shell coal gasification technology, a back-blowing mode of back-blowing tens to tens of filter pipes by a single nozzle is adopted.
The structure schematic diagram and the processing flow diagram of the existing industrial high-temperature filter are shown in fig. 1A, and the high-temperature filter is mainly used for working conditions of high temperature and high pressure. Taking Shell coal gasification technology as an example, the technology belongs to second generation coal gasification technology of entrained flow gasification, a high-temperature filter is utilized for dry dedusting, the internal operation temperature is 350-400 ℃, the operation pressure is 4.0MPa, and the pulse back blowing cleaning is carried out The ash pressure is 7.8MPa, the temperature of the back blowing gas is about 225 ℃, and the dust concentration of the purified gas is required to be less than 20mg/Nm 3 。
As shown in fig. 1A, the tube sheet 103 of the filter 100 sealingly separates the filter into two parts, a lower part being the dirty gas side 104 and an upper part being the clean gas side 111. The dirty gas enters the dirty gas side 104 of the filter 100 from the gas inlet 101 of the filter and reaches the individual filter units under the force of the gas pushing. Solid particles in the gas flow are deposited on the outer surface of the filter tube 102 to form a stable and compact dust layer, and dust-containing gas is filtered through the porous channels of the filter tube 102 and then enters the clean gas side 111, and is discharged through the gas outlet 105 to enter the subsequent process. As the filtration process proceeds, the dust layer on the outer surface of the filter tube 102 gradually increases, resulting in an increase in pressure drop across the filter 100, and a pulse back-flushing mode is required to achieve regeneration of the filter tube.
When the pulse back blowing ash removal is performed, a pulse back blowing valve 109 in a normally closed state is opened, high-pressure nitrogen in a back blowing gas storage tank 110 instantaneously enters a back blowing pipeline 108 through a connecting pipeline, and then high-pressure high-speed back blowing gas is sprayed into a corresponding ejector 106 through a nozzle 107 at the tail end of the back blowing pipeline 108.
The ejector 106 has a structure shown in fig. 1B and is composed of three parts, i.e., a contraction section 112, a throat section 113 and an expansion section 114. Each eductor 106 corresponds to a filter unit, each filter unit typically containing 48 filter tubes 102. The upper end of the filter tube 102 contained in the filter unit is arranged on the tube plate 103 in a penetrating way and is communicated with the ejector 106.
In a circular filter unit, the filter tubes 102 are arranged in an equi-triangular manner. Because of the distance between the outlet end face of the nozzle 107 and the inlet end face of the ejector 106, the high-pressure high-speed blowback gas is ejected into the constriction 112 of the ejector 106. A large amount of purified gas in the clean gas side 111 enters along with the back-blowing main pulse jet flow, and after being fully mixed through the throat section 113 and the expansion section 114, the back-blowing gas enters the filter tube 102 from the opening end of the filter tube 102, and the transient energy is utilized to overcome the adhesion force between a dust layer and the outer surface of the filter tube 102 so as to strip and remove the dust layer, so that the pressure drop of the filter tube 102 is suddenly reduced, and the state of the filter tube 102 is basically restored to the state of initial filtration, thereby realizing the cyclic regeneration of the performance of the filter tube.
Typically 12 or 24 identical filter units are mounted on the tube sheet 103 of the filter. When the pulse is back-blown, the first group of filter units are back-blown for a certain time according to the set back-blowing time, the second group of filter units are back-blown, and the third group of filter units are back-blown for a certain time, so that the cycle is repeated.
At present, in order to meet the process requirements of large treatment air volume and reduce the energy consumption of back-blowing air, the number of the filter pipes corresponding to each filter unit is developed from tens to tens, but in the prior art, a pulse back-blowing device mainly adopts a nozzle in a single-hole and directional injection mode, and a pulse back-blowing valve is opened and closed only once to generate pulse pressure oscillation waves in the filter pipes. Therefore, in the actual operation process, the blowback method in the prior art inevitably causes the following problems:
(1) Non-uniform pulse back-blowing ash removal
Because the nozzle is arranged at the tail end of the blowback pipeline, and the circle centers of the outlet end face of the nozzle and the inlet end face of the ejector are in the same vertical direction (namely, the main pulse jet flow direction is opposite to the center of the filter unit), high-pressure high-speed blowback gas energy tends to act on the center area of the filter unit more, the strength of blowback gas is gradually attenuated from the center position to the periphery position near the periphery position in the bottom end face of the ejector, the ash removing strength of the filter pipe near the center position is finally high, the ash removing strength of the filter pipe near the periphery position is small, the phenomenon of uneven pulse blowback ash removing occurs, and long-term operation leads to bridging of dust layers among the filter pipes of the incomplete ash removing part, so that the filter pipe breaks and fails.
(2) High pulse back-flushing pressure and low service life of filter tube
Because the pulse back blowing ash removal of a plurality of filter pipes of the same filter unit has uneven characteristics, in order to ensure the integral stable operation of the filter, the pulse back blowing pressure is required to be improved, so that the filter pipes with lower back blowing strength and poorer ash removal effect can also achieve ideal ash removal efficiency, but the too high back blowing pressure is extremely easy to cause strong vibration of the filter pipes near the central position of the filter unit, and the back blowing gas temperature is usually far lower than the gas temperature of forward filtration in the filter, so that the filter pipes bear larger thermal shock, the mechanical strength and thermal shock resistance of the filter pipes are required to be higher, the fatigue fracture of the filter pipes can be accelerated after long-term operation, and the service life of the filter pipes is obviously reduced. Meanwhile, the filter pipe with higher back-blowing strength near the center position of the part of filter unit can generate the condition of excessive ash removal, so that the residual dust layer formed on the outer surface of the filter pipe and used for stable filtration is destroyed, the filtration precision of the forward filtration process is obviously reduced within a period of time after the back-blowing is finished, and the stable operation of subsequent equipment is not facilitated.
(3) Pulse back blowing ash removal efficiency is low
Currently, in order to meet the industry practice of large process gas volumes, it is required that the filtration area of the individual filtration tubes be maximized. With the increasing maturity of filter tube forming technology, the design length of single filter tube increases gradually. However, the transient energy generated by the back-blowing air flow enters the filter pipe, and in the process of energy transfer from the open end of the filter pipe to the blind end, the back-blowing air flow continuously flows out of the porous channel of the filter pipe in a radial way, so that the energy attenuation of a pulse pressure wave in the filter pipe is faster, and the ash removal effect of the filter pipe is poorer near the blind end position along the length direction; if a back blowing mode of increasing back blowing pressure and prolonging pulse width is adopted, secondary deposition of a negative pressure stage near an opening end at the end of pulse back blowing is increased, so that the ash removal effect near the position is poor, namely, the ash removal efficiency of a single filter tube is reduced due to lower local ash removal efficiency by selecting pulse back blowing parameters anyway.
(4) The number of the back-blowing filter pipes of the same filter unit is small
At present, in order to realize the industrial practice of large treatment air volume, another effective method is to increase the number of filter pipes in a single filter unit, but the method is limited by the prior blowback structure and the influence of uneven ash removal among different filter pipes in the single filter unit, and more filter pipes can inevitably cause two unstable working conditions of excessive ash removal and incomplete ash removal by single pulse blowback, so that the number of filter pipes in the single filter unit can only be reduced, the number of blowback groups in the filter is increased, the structure of a blowback system is finally complicated, the number of vulnerable parts such as pulse blowback valves is increased, and the long-term stable operation of a blowback ash removal device is not facilitated.
It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present invention and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the invention section.
Disclosure of Invention
Based on the defects in the prior art, the embodiment of the invention provides a self-direction-adjusting periodic pulse jet nozzle, a filter applying or configured with the self-direction-adjusting periodic pulse jet nozzle, and the main pulse jet direction is changed by arranging a direction-adjusting channel in the circumferential direction of a back-blowing main pipeline, so that the problem of uneven ash removal among different filter pipes in the circumferential direction in a single filter unit and the problem of uneven ash removal of different positions of a single filter pipe in the length direction are effectively solved. Meanwhile, the energy consumption of the back-blowing air is reduced, the thermal shock to the filter pipe near the center position of the filter unit is reduced, and the service life of the filter pipe is prolonged.
In order to achieve the above object, the present invention provides the following technical solutions.
A self-directing periodic pulsed jet nozzle comprising: a body and a rotating ring; wherein,
the body is provided with a main channel and a direction-adjusting channel positioned outside the main channel; the outlet ends of the main channel and the direction-adjusting channel penetrate through the lower end face of the body; the central axis of the outlet end of the direction-adjusting channel is inclined towards the central axis direction of the main channel;
the rotating ring is arranged at the upper end of the body and corresponds to the main channel, and a notch used for communicating with the direction-adjusting channel is arranged on the rotating ring; a plurality of airfoil blades are arranged in the rotating ring;
when ash cleaning operation is executed, pulse back blowing air can enter the main channel through the rotating ring, and the wing blades are acted by the pulse back blowing air to generate rotating moment so as to drive the rotating ring to rotate; and in the rotating process of the rotating ring, when the notch is communicated with the inlet end of the direction-adjusting channel, part of the pulse back-blowing gas enters the direction-adjusting channel.
Preferably, the inner wall of the direction-adjusting channel is smoothly transited, and the middle section of the direction-adjusting channel is arched towards the direction away from the main channel; the cross-sectional area of the direction-regulating channel is gradually reduced along the flow direction of the pulse back-blowing gas.
Preferably, the plurality of direction-adjusting channels are arranged in a ring array; and the horizontal plane where the centers of the cross-sectional shapes of the inlet ends of the plurality of direction-adjusting channels are positioned is coplanar with the horizontal plane where the circle centers of the rotating rings are positioned.
Preferably, the sum of the cross-sectional areas of the inlet ends of a plurality of said direction-modifying channels is less than half the cross-sectional area of the inlet end of said main channel; the sum of the cross-sectional areas of the outlet ends of a plurality of said direction-modifying channels is also less than half the cross-sectional area of the outlet end of said main channel.
Preferably, the maximum cross-sectional area of the notch perpendicular to the radial direction of the rotating ring is larger than or equal to the cross-sectional area of the inlet end of the direction-adjusting channel.
Preferably, the plurality of airfoil blades are arranged in an annular array, one ends of the airfoil blades are butted at the center of the rotating ring, and the other ends of the airfoil blades are fixed on the inner wall of the rotating ring.
Preferably, the straight line length at two ends of the tangent plane of the airfoil blade is the chord length of the blade, and is marked as c;
the maximum length of the wing-shaped blade along the development direction of the blade is the length of the blade and is marked as h;
then the first time period of the first time period,
wherein n is the number of the airfoil blades, S in Is the cross-sectional area of the inlet end of the main channel.
Preferably, a mounting groove matched with the rotating ring is formed at the position of the upper end of the body corresponding to the main channel in a downward sinking manner; the inlet end of the direction-adjusting channel is formed on the inner wall of the mounting groove, and the rotating ring is embedded in the mounting groove.
Preferably, a first groove is formed on the lower end surface of the rotating ring, and a first annular track groove corresponding to the first groove is formed on the bottom surface of the mounting groove; and a first ball is clamped between the first groove and the first annular track groove.
Preferably, the first groove is arc-shaped, and two ends of the first groove are not communicated with the notch.
Preferably, the relative positions of the first balls and the rotary ring are fixed.
Preferably, a first frame is fixed on the lower end surface of the rotating ring, the first frame is provided with a first limiting ring, and the first balls are arranged in the first limiting ring and limited.
Preferably, the cross section of the first groove is in a shape of a circle matched with the shape of the first ball, and the first groove and the first ball are multiple; the first balls are embedded in the corresponding first grooves and limited.
Preferably, the height of the rotating ring is smaller than the depth of the mounting groove; the upper end of the body is provided with a compression end cover, and the compression end cover is provided with an opening communicated with the rotating ring and the main channel at the central position of the compression end cover; the lower end of the compression end cover is provided with a compression protrusion matched with the mounting groove in a downward extending mode at the position corresponding to the opening, the compression protrusion is embedded into the mounting groove, and the lower end face of the compression protrusion abuts against the upper end face of the rotating ring.
Preferably, a second groove is formed on the upper end face of the rotating ring, and a second annular track groove corresponding to the second groove is formed on the lower end face of the pressing protrusion; and a second ball is clamped between the second groove and the second annular track groove.
Preferably, the second groove is arc-shaped, and two ends of the second groove are not communicated with the notch.
Preferably, the relative positions of the second balls and the rotating ring are fixed.
Preferably, a second frame is fixed on the upper end surface of the rotating ring, the second frame is provided with a second limiting ring, and the second balls are arranged in the second limiting ring and are limited.
Preferably, the cross section of the second groove is in a shape of a circle matched with the shape of the second ball, and the second groove and the second ball are multiple; the second balls are embedded in the corresponding second grooves and limited.
A filter, comprising:
a shell with an inner accommodating space, wherein a tube plate is arranged in the shell and divides the inner accommodating space of the shell into a dust-containing gas chamber and a clean gas chamber, a plurality of hole collecting units are arranged on the tube plate, and each hole collecting unit comprises a plurality of mounting holes; a plurality of mounting holes are penetrated with filter pipes, the side walls of the filter pipes are provided with continuous and uniform porous channels, the filter pipes are communicated with the dust-containing gas chamber through the continuous and uniform porous channels, and the upper ends of the filter pipes are opened;
the plurality of ejectors are arranged on the tube plate, each ejector corresponds to one hole collection unit, and the filter pipe is communicated with the clean gas chamber through the ejectors;
the first ends of the back-blowing pipes are communicated with a back-blowing air source, and the second ends of the back-blowing pipes extend into the clean gas chamber and correspond to the ejectors one by one;
The self-redirecting periodic pulse-jet nozzle as in any one of the embodiments above, connected to a second end of the blowback pipe.
Preferably, the ejector comprises a funnel-shaped contraction section, a cylindrical throat section and a gradually-expanding conical expansion section which are sequentially connected along the flowing direction of the back-blowing gas; wherein, a first included angle is formed between a bus of the expansion section and the vertical direction;
the central axis of the outlet end of the direction-regulating channel forms a second included angle with the vertical direction, and the second included angle is consistent with the first included angle.
The embodiment filter can adjust the jet direction of back-blowing gas by adopting the self-direction-adjusting periodic pulse jet nozzle, increase the jet flow amount, prolong the jet flow length, improve the dynamic performance of the flow of primary jet flow and secondary drainage gas in the jet injector, and solve the problem of uneven ash removal among different filter pipes in the circumferential direction in a single filter unit.
In addition, through the high-speed rotation of the rotary ring, the pulse back-flushing valve is opened and closed once to generate a plurality of intermittent pulse pressure oscillation waves. The problem of the uneven deashing of single filter tube along length direction is effectively solved.
Meanwhile, the defects of secondary deposition, vibration of the filter pipe and the like easily caused by high-pressure back blowing in the prior art are overcome, and the method is particularly suitable for the actual working conditions of large-treatment-capacity and multi-filter pipes.
And by additionally arranging the direction-regulating channel, the area of a low-pressure area near the outlet end of the main channel is enlarged, and the flow speed of the pulse back-blowing gas at the outlet end of the direction-regulating channel is faster and the pressure is lower. The sample is favorable for increasing the air quantity of secondary drainage, improving the injection effect and prolonging the jet flow length.
Practice proves that the self-direction-adjusting periodic pulse jet nozzle and the filter with the self-direction-adjusting periodic pulse jet nozzle can achieve the following technical effects:
(1) The non-uniformity of pulse back-blowing ash removal is improved, and the ash removal efficiency is improved
The filter of the embodiment of the invention can improve the flow distribution of pulse back-blowing gas and the dynamic performance of gas flow in the same filter unit by configuring the self-direction-adjusting periodic pulse jet nozzle, remarkably improves the non-uniformity among dozens to dozens of filter pipes in the same filter unit by designing and matching the structures and the sizes of the rotating ring, the direction-adjusting channel and the main channel, and improves the ash cleaning efficiency by more than 8 percent under the same condition.
(2) The back-blowing gas consumption and the back-blowing gas pressure are reduced
When the pulse is back-blown, pulse pressure oscillation waves are intermittently generated in each filter pipe for a plurality of times at different positions in the circumferential direction of the end face of the bottom of the ejector. The method is equivalent to carrying out ash removal for a plurality of times in a one-time back blowing process, and the ash removal nonuniformity of a single filter tube along the length direction is greatly improved. At the same time, the secondary deposition of the negative pressure phase near the end of the pulse back-blowing is reduced. Therefore, better ash removal effect can be achieved only by using lower back blowing pressure, and back blowing energy consumption is saved.
(3) Is suitable for the actual working condition with large treatment capacity and prolongs the service life of the filter pipe
The improvement of the non-uniformity of ash removal among different filter pipes in the same filter unit and the non-uniformity of ash removal of a single filter pipe along the length direction provides possibility for the increase of the number and the length of the filter pipes in a single filter unit. The collision of the high-speed back-blowing ash-cleaning jet flow sprayed by the direction-adjusting channel and the main back-blowing ash-cleaning jet flow sprayed by the main channel can be utilized to achieve the effect that the direction of the main back-blowing ash-cleaning jet flow is adjustable, so that the arrangement mode of a plurality of filter pipes in the same filter unit is more flexible and changeable, and the filter is suitable for round filters and rectangular filters. Meanwhile, the ash removal difference is reduced, so that the possibility of dust bridging among the filter pipes is greatly reduced, and the stable and reliable operation of the filter is ensured.
Specific embodiments of the invention are disclosed in detail below with reference to the following description and the accompanying drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope thereby. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be. In the drawings:
FIG. 1A is a schematic diagram of a prior art high temperature filter;
FIG. 1B is a schematic diagram of the injector of FIG. 1A and its corresponding arrangement of filter tubes;
FIG. 2 is a schematic diagram of a filter according to an embodiment of the present invention;
FIG. 3A is a schematic diagram of a self-directing periodic pulse jet nozzle in accordance with an embodiment of the present invention;
FIG. 3B is an enlarged view of a portion of the sliding friction pair between the rotating ring and the body and compression end cap of FIG. 3A;
fig. 4A to 4C are top view block diagrams illustrating a first groove or a second groove provided on the rotating ring in fig. 3A;
FIG. 5A is a schematic view of a blowback using a single hole directional jet nozzle of the prior art;
FIG. 5B is a schematic view of a self-directing periodic pulse jet nozzle blowback employing an embodiment of the present invention;
fig. 6A to 6D are top view block diagrams of a body with different numbers of steering channels according to an embodiment of the present invention;
FIGS. 7A-7D are schematic illustrations of filter tubes in a turn-down jet range cover Kong Ji unit in accordance with an embodiment of the invention;
8A-8D are top view block diagrams of the rotating ring of FIG. 3A with different numbers of airfoil blades;
FIG. 9 is a schematic view of a cut-out configuration of the airfoil vane of FIG. 3A;
FIG. 10 is a graph showing the peak pressure in each filter tube of the same filter unit for the embodiment of the present invention compared with the prior art in blowback;
FIG. 11 is a graph showing the comparison of ash removal efficiency of the same filter unit in the embodiment of the invention with the prior art blowback.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Embodiments of the present invention provide a self-directing periodic pulse jet nozzle 207, and a filter 200 employing or configuring the self-directing periodic pulse jet nozzle 207.
As shown in fig. 2, the filter 200 according to the embodiment of the present invention may include a housing 212 having an inner accommodating space, in which a tube sheet 203 is disposed in the housing 212, and the tube sheet 203 partitions the inner accommodating space of the housing 212 into a dust-containing gas chamber 204 and a clean gas chamber 211.
As shown in connection with fig. 7A to 7D, a plurality of hole-collecting units 2032 are provided on the tube sheet 203, and each hole-collecting unit 2032 includes a plurality of mounting holes 2031. The filter tube 202 is inserted into the mounting hole 2031, a continuous and uniform porous passage is provided in the side wall of the filter tube 202, the filter tube 202 is communicated with the dust-containing gas chamber 204 through the continuous and uniform porous passage, and the upper end of the filter tube 202 is opened.
The tube plate 203 is provided with ejectors 206 adapted to a plurality of hole collection units 2032, and each ejector 206 corresponds to one hole collection unit 2032. The upper end of the filter tube 202 is threaded onto the tube sheet 203 and communicates with the eductor 206. Thus, the filter tube 202 communicates with the clean gas chamber 211 through the eductor 206.
In addition, each of the hole-collecting units 2032 constitutes a filtering unit together with the filtering pipes 202 penetrating into the installation holes 2031 included in the hole-collecting unit 2032, and the ejector 206 fitted with the hole-collecting unit 2032.
Further, a gas inlet 201 and a gas outlet 205 are provided on the side wall of the housing 212. The gas inlet 201 communicates with a dirty gas chamber 204 and the gas outlet 205 communicates with a clean gas chamber 211.
When the filter 200 of the embodiment of the present invention performs a high-temperature dust-laden gas cleaning operation, dust-laden gas enters the dust-laden gas chamber 204 from the gas inlet 201 and reaches each filter tube 202 by the pushing force of the gas. Solid particulate matter in the gas stream deposits and forms a stable and dense dust layer on the outer surface of the filter tube 202 due to inertial impaction, direct interception, and brothers' diffusion. The dust-containing gas is filtered through the porous channels of the filter tube 202 and then enters the clean gas chamber 211, and is discharged through the gas outlet 205 to enter the subsequent process.
When the dust layer on the outer surface of the filter tube 202 gradually thickens with the progress of the filtering process, resulting in the continuous increase of the pressure drop of the filter 200, and the running resistance of the device increases, the circulating regeneration of the filter tube 202 needs to be realized by adopting a pulse back-flushing mode.
Specifically, the filter 200 of the embodiment of the present invention is further configured with a blowback pipe 208 that is adapted to the plurality of ejectors 206. Wherein, the ejector 206 is connected with the upper end of the filter tube 202, so that the filter tube 202 is communicated with the clean gas chamber 211 through the ejector 206. The blowback pipe 208 has a first end in communication with a blowback gas source 210 and a second end extending into the clean gas chamber 211 in one-to-one correspondence with the eductor 206.
The blowback gas source 210 is specifically a storage tank storing blowback gas, and the blowback pipe 208 is provided with a pulse blowback valve 209. A second end of the blowback pipe 208 is provided with a self-aligning periodic pulse jet nozzle 207 corresponding to the top of the eductor 206.
When the pulse back blowing ash removal is performed, the pulse back blowing valve 209 in a normally closed state is opened, high-pressure nitrogen in the storage tank instantaneously enters the back blowing pipe 208 through the connecting pipeline, and then high-pressure high-speed back blowing gas is sprayed into the corresponding ejector 206 through the self-direction-regulating periodic pulse jet nozzle 207 on the second end of the back blowing pipe 208, so that ash removal operation is realized.
As shown in fig. 3A, the self-directing periodic pulsed jet nozzle 207 may include a body 2071 and a rotating ring 2072.
In the present embodiment, the body 2071 may have a substantially rectangular block shape or a cylindrical shape, and has a main passage 2071a and a direction-adjusting passage 2071b located outside the main passage 2071a therein. The outlet ends, i.e., the lower ends, of the main channel 2071a and the steering channel 2071b penetrate the lower end surface of the body 2071. Thus, the pulse back blow gas may be ejected through the outlet ends of the main channel 2071a and the steering channel 2071b.
The rotating ring 2072 is in a ring shape, and is disposed at an upper end of the body 2071 to correspond to the main channel 2071 a. As shown in fig. 4A to 4C and fig. 8A to 8D, the rotating ring 2072 is provided with a notch 2072a for communicating with the steering passage 2071b. And a plurality of airfoil blades 2072b are provided in the rotating ring 2072.
When the ash cleaning operation is performed, the pulse back blowing air can enter the main passage 2071a through the rotating ring 2072, and the plurality of airfoil blades 2072b generate a rotating moment by the pulse back blowing air, thereby driving the rotating ring 2072 to rotate.
And, when the notch 2072a is communicated with the inlet end of the direction-adjusting passage 2071b during the rotation of the rotating ring 2072, a part of the pulse back-blowing gas enters the direction-adjusting passage 2071b. And finally ejected from the outlet end of the steering channel 2071b at a high speed.
In the present embodiment, the main channel 2071a extends in the vertical direction, and the steering channel 2071b extends in a curved manner. That is, the main channel 2071a and the steering channel 2071b are not parallel.
Specifically, the outlet end of the steering channel 2071b is inclined toward the main channel 2071 a. In this way, the high-speed blowback ash jet ejected from the direction-adjusting passage 2071b collides with the main blowback ash jet ejected from the main passage 2071 a. Thus, under the momentum of the high-speed blowback ash jet, the flow direction of the main blowback ash jet deflects toward the flow direction of the high-speed blowback ash jet ejected from the direction-adjusting channel 2071b and fully develops inside the ejector 206. Thereby expanding the blowback coverage of the main blowback ash removal jet flow in the circumferential direction of the bottom end surface of the ejector 206.
Meanwhile, due to the high speed rotation of the rotating ring 2072, when the notch 2072a is again communicated with the inlet end of the same direction-adjusting channel 2071b on the body 2071, secondary ash removal will be generated on the filter tube 202 with the same coverage area of the bottom end surface of the injector 206. That is, the higher the rotational angular velocity of the rotating ring 2072, the more the number of pulse ash cleaning times of the filter tube 202 of the same coverage area. Therefore, the periodic ash removal in the single pulse back blowing process can be realized.
As described above, according to the filter 200 of the embodiment of the present invention, the jet direction of the back-blowing gas can be adjusted by adopting the self-direction-adjusting periodic pulse jet nozzle 207, the jet flow amount is increased, the jet flow length is prolonged, the dynamic performance of the primary jet flow and the secondary drainage gas flow in the ejector 206 is improved, and the problem of uneven ash removal between different filter pipes 202 along the circumferential direction in a single filter unit is solved.
In addition, by the high-speed rotation of the rotating ring 2072, it is realized that the pulse back-flushing valve 209 is opened and closed once to generate a plurality of intermittent pulse pressure oscillation waves. Effectively solves the problem of uneven ash removal of the single filter pipe 202 along the length direction.
In addition, by adding the direction-adjusting passage 2071b, not only the area of the low-pressure region near the outlet end of the main passage 2071a is enlarged, but also the flow rate of the pulse back-blowing gas at the outlet end of the direction-adjusting passage 2071b is faster and the pressure is lower. Thus, the secondary drainage air flow is increased, the injection effect is improved, and the jet flow length is prolonged.
Meanwhile, the defects that high-pressure back blowing is easy to generate secondary deposition, the filter pipe 202 vibrates and the like in the prior art are overcome, and the method is particularly suitable for the actual working conditions of the large-treatment-capacity multi-filter pipe 202.
In the present embodiment, since the number of the steering passages 2071b is plural. If the number of the notch 2072a is also plural, there may be a case where the plurality of notches 2072a are respectively communicated with the plurality of steering passages 2071b, that is, there is a possibility that the plurality of steering passages 2071b are communicated when the rotating ring 2072 is rotated to a certain position. In this way, the high-speed blowback ash jet ejected through the plurality of turned-on direction-adjusting channels 2071b interferes with the main blowback ash jet ejected from the main channel 2071a, thereby complicating the control of blowback gas.
Further, since the main blowback ash jet ejected from the main passage 2071a is disturbed, a disturbance occurs in the deflection direction in which the main blowback ash jet may occur. Therefore, the directionality of the main back blowing ash removal jet flow is greatly weakened, the energy loss is further caused, and the ash removal effect is greatly reduced.
In view of this, the number of the notches 2072a is preferably 1. Then, even if a plurality of steering channels 2071b are provided, at most only 1 steering channel 2071b can be opened at any position during rotation. In this way, under the action of the high-speed back-blowing ash jet ejected from the opened 1 direction-adjusting channel 2071b, the direction of the main back-blowing ash jet ejected from the main channel 2071a can only deflect towards a single direction which is the same as or similar to the direction of the high-speed back-blowing ash jet ejected from the opened 1 direction-adjusting channel 2071b. In this manner, the primary blowback ash jet exiting the primary passage 2071a may be stably deflected without being affected and disturbed by other high velocity blowback ash jets. Thus, control of the blowback gas is simplified.
In addition, since only 1 direction-adjusting channel 2071b can be opened at a time, the main back-blowing ash-cleaning jet ejected from the main channel 2071a is only deviated by the high-speed back-blowing ash-cleaning jet ejected from the 1 opened direction-adjusting channel 2071b, and the situation that the main back-blowing ash-cleaning jet is disturbed due to the existence of a plurality of high-speed back-blowing ash-cleaning jet, so that the deflection direction of the main back-blowing ash-cleaning jet is disturbed is avoided. Therefore, the main back blowing ash removing jet flow has better directionality, more concentrated energy and greatly improved ash removing effect.
As shown in fig. 3A, in the present embodiment, the rotary ring 2072 is assembled with the body 2071 in such a manner that the upper end of the body 2071 is downwardly concavely formed with a fitting groove 2071c adapted to the rotary ring 2072 at a position corresponding to the main passage 2071a, that is, the sectional shape of the fitting groove 2071c is circular. An inlet end of the direction-adjusting passage 2071b is formed on an inner wall of the mounting groove 2071c, and the rotary ring 2072 is fitted in the mounting groove 2071 c.
Thus, when the rotating ring 2072 rotates in the mounting groove 2071c, the notch 2072a communicates with the steering passage 2071b whose inlet end is formed on the inner wall of the mounting groove 2071 c.
In order to reduce friction resistance of the rotating ring 2072 with the mounting groove 2071c during rotation so that the rotating ring 2072 can smoothly rotate, a rolling friction pair may be provided between a lower end surface of the rotating ring 2072 and a bottom surface of the mounting groove 2071 c. In this way, the sliding friction is replaced by the rolling friction, and the frictional resistance of the rotating ring 2072 with the mounting groove 2071c during rotation is greatly reduced.
Specifically, as shown in fig. 3B, the lower end surface of the rotating ring 2072 may be formed with a first groove 2072c, and the bottom surface of the mounting groove 2071c may be formed with a first annular track groove 2071d corresponding to the first groove 2072 c. A first ball 2074 may be interposed between the first groove 2072c and the first annular rail groove 2071d.
Since the rotating ring 2072 is provided with the notch 2072a, in order to prevent the first ball 2074 from sliding out through the notch 2072a, a structure for limiting the first ball 2074 should be designed to limit the movable range of the first ball 2074.
Specifically, as shown in fig. 4A to 4B, in one embodiment, the first groove 2072c may have an arc shape, and both ends of the first groove 2072c having an arc shape are not connected with the notch 2072 a. At this time, the central angle corresponding to the first groove 2072c is smaller than the central angle corresponding to the rotary ring 2072. The opposite ends corresponding to the first grooves 2072c are closed ends, so that when the first balls 2074 roll to either end of the first grooves 2072c, they are stopped, so that the first balls 2074 do not slip out through the gaps 2072 a.
In this embodiment, the first recess 2072c may be continuously curved (as in the embodiment illustrated in fig. 4A). Alternatively, the first recess 2072c may be a plurality of spaced or intermittently disposed arcuate recesses (as in the embodiment illustrated in fig. 4B).
The number of the first balls 2074 may be plural, and the plural first balls 2074 may be provided at intervals.
Alternatively, in another embodiment, the relative positions of the first balls 2074 and the rotating ring 2072 may be fixed. Thus, the first balls 2074 roll in the first annular track groove 2071d by the rotation of the rotary ring 2072. The position of the first ball 2074 relative to the rotary ring 2072 is not changed. So that the first ball 2074 does not slip out through the notch 2072 a.
In a specific implementation manner, a first frame may be fixed to the lower end surface of the rotating ring 2072, where the first frame has a first limiting ring, and the first balls 2074 are disposed in the first limiting ring and are limited. In this way, the first balls 2074 are restrained by the first retainer ring such that the first balls 2074 roll only in the first annular track groove 2071d, and the position with respect to the rotary ring 2072 is unchanged.
In this implementation, the first frame may be referred to or similar to the frame structure of the bearing.
Alternatively, as shown in fig. 4C, in another implementation, the cross section of the first groove 2072C may be a circle that matches the shape of the first ball 2074, and the first ball 2074 is embedded in the corresponding first groove 2072C and is limited.
In this implementation, the depth of the rounded first groove 2072c is approximately equal to the radius of the first ball 2074. Thus, the first balls 2074 may be inserted into the first grooves 2072 c. Likewise, the first ball 2074 is restrained by the first groove 2072c having a circular shape such that the first ball 2074 rolls only in the first annular track groove 2071d and the position with respect to the rotary ring 2072 is not changed.
Further, in order to limit the rotating ring 2072 in the vertical direction, the upper end of the body 2071 may be provided with a pressing end cover 2073 for limiting the rotating ring 2072.
With continued reference to fig. 3A, the height of the spin ring 2072 is less than the depth of the mounting groove 2071 c. Thus, the mounting groove 2071c is located in an inner wall or space above the rotating ring 2072 for attachment of the compression end cap 2073.
A pressing end cover 2073 is provided at an upper end of the body 2071, and the pressing end cover 2073 is provided at a central position thereof with an opening 2073a communicating with the rotary ring 2072 and the main passage 2071 a. And, a pressing projection 2073b is formed to extend downward at a position of the lower end of the pressing end cover 2073 corresponding to the opening 2073a, the pressing projection 2073b being fitted into the mounting groove 2071 c. The lower end surface of the pressing projection 2073b abuts against the upper end surface of the rotary ring 2072, so that the rotary ring 2072 is restrained in the vertical direction.
In this embodiment, the compression end cover 2073 may be threadably mounted to the body 2071. Specifically, an inner wall of the mounting groove 2071c above the rotary ring 2072 is provided with an internal thread, and an outer wall of the pressing projection 2073b is provided with an external thread. Thus, the removable connection of the compression end cover 2073 to the body 2071 is achieved by the mating of the internal and external threads.
Of course, the connection of the compression end cover 2073 to the body 2071 is not limited to the above, and in other possible embodiments, such as snap connection, welding or bonding, etc., the embodiments of the invention are not limited as long as the limit of the compression end cover 2073 to the rotation ring 2072 can be achieved.
In addition, the connection of the second end of the blowback pipe 208 to the self-aligning periodic pulse jet nozzle 207 may be implemented by screwing.
Specifically, in embodiments where self-adjusting periodic pulsed jet nozzle 207 includes a hold-down end cap 2073, the inner wall of opening 2073a of hold-down end cap 2073 is provided with internal threads and the outer wall of the second end of blowback tube 208 is provided with external threads. Thus, the connection of the blowback pipe 208 to the self-aligning periodic pulse jet nozzle 207 is accomplished by the mating of the internal and external threads and by the compression of the end cap 2073.
Whereas in embodiments where the self-directing periodic pulse jet nozzle 207 does not include a hold-down end cap 2073, the inner wall of the mounting slot 2071c above the spin ring 2072 is provided with internal threads and the outer wall of the second end of the blowback tube 208 is provided with external threads. Thus, the connection of the blowback pipe 208 to the self-aligning periodic pulse jet nozzle 207 is achieved by the mating of the internal and external threads.
Similarly, the connection between the blowback pipe 208 and the self-directing periodic pulse jet nozzle 207 is not limited to the above, and in other possible embodiments, such as snap connection, welding or bonding, etc., the connection between the blowback pipe 208 and the self-directing periodic pulse jet nozzle 207 can be achieved, which is not limited in the embodiments of the present invention.
Further, in order to reduce friction resistance of the rotating ring 2072 with the pressing protrusion 2073b of the pressing end cover 2073 during rotation so that the rotating ring 2072 can smoothly rotate, a rolling friction pair may be provided between an upper end surface of the rotating ring 2072 and a lower end surface of the pressing protrusion 2073 b. In this way, the sliding friction is replaced by rolling friction, greatly reducing the friction resistance of the rotating ring 2072 against the compression end cover 2073 during rotation.
Specifically, as shown in fig. 3B, in one embodiment, an upper end surface of the rotating ring 2072 may be formed with a second groove 2072d, and a lower end surface of the pressing protrusion 2073B may be formed with a second annular track groove 2073c corresponding to the second groove 2072 d. A second ball 2075 may be sandwiched between the second groove 2072d and the second annular rail groove 2073c.
As described above, the second groove 2072d may have an arc shape, and both ends of the second groove 2072d are not connected with the notch 2072 a. Also, the second groove 2072d may have a continuous arc shape. Alternatively, the second recess 2072d may be a plurality of arc recesses provided at intervals or intermittently. The number of the second balls 2075 may be plural, and the plural second balls 2075 may be provided at intervals.
Alternatively, in another embodiment, the relative positions of the second balls 2075 and the spin ring 2072 are fixed.
Likewise, in a specific implementation manner, a second frame may be fixed to an upper end surface of the rotating ring 2072, where the second frame has a second limiting ring, and the second balls 2075 are disposed in the second limiting ring and are limited.
Alternatively, the cross section of the second groove 2072d is a circle shape adapted to the shape of the second ball 2075, and the second ball 2075 is embedded in the corresponding second groove 2072d and is restrained.
In this embodiment, regarding the related structure that occurs in the rolling friction pair disposed between the upper end surface of the rotating ring 2072 and the lower end surface of the pressing protrusion 2073b, reference may be made to the above description, and in the embodiment of the present invention, for brevity, a description is omitted here.
As shown in fig. 3A, the direction-adjusting channel 2071b has a certain length and curvature, and adopts a smooth transition taper to reduce the flow resistance of the pulse back-blowing gas. Meanwhile, the cross-sectional area of the direction-adjusting channel 2071b gradually decreases along the flow direction of the pulse back-blowing gas, so that the flow rate of the pulse back-blowing gas can be increased to obtain a larger velocity energy head.
Specifically, the degree of shrinkage of the cross-sectional area of the direction-adjusting channel 2071b may be designed according to different working condition requirements such as the number of the direction-adjusting channels 2071b and the distribution of the back-blowing gas flow. On the one hand, the loss of the pulse pressure wave propagating in the direction-regulating channel 2071b can be reduced, and the energy transmission efficiency is improved. On the other hand, the conversion of static pressure to dynamic pressure in the flow channel of the direction-adjusting channel 2071b is facilitated, the momentum of jet flow at the outlet of the direction-adjusting channel 2071b is improved, and the adjustment capability of the direction of main jet flow is enhanced.
Further, the middle section of the steering channel 2071b arches in a direction away from the main channel 2071a (i.e., radially outward), and the lower end gradually curves in a direction toward the main channel 2071a (i.e., radially inward). The central axis of the outlet end of the steering passage 2071b is inclined toward the central axis of the main passage 2071 a. Thereby, the outlet ends of the plurality of steering channels 2071b converge toward the main channel 2071 a.
The degree of inclination of the outlet end of the diverting passage 2071b is related to the inclination of the diverging section 2063 of the eductor 206. Specifically, as shown in fig. 5B, the injector 206 in the embodiment of the present invention includes a funnel-shaped constriction 2061, a cylindrical throat 2062, and a divergent cone-shaped expansion 2063 connected in sequence along the flow direction of the back-blowing gas. Wherein the generatrix of the expansion section 2063 forms a first angle α with the vertical.
And the central axis of the outlet end of the steering channel 2071b forms a second angle beta with the vertical direction. The second included angle beta tends to be consistent with the first included angle alpha.
In this embodiment, the second included angle β and the first included angle α tend to be consistent, and the difference between the second included angle β and the first included angle α may be within a predetermined range. For example, the predetermined range is between 0 ° and 10 °. And the second included angle beta is not larger than the first included angle alpha.
It should be noted that the predetermined range may be set according to practical situations, and mainly reference may be made to the structure of the ejector 206, particularly the inclination angle of the expanding section 2063, which is not limited in the embodiment of the present invention.
As shown in fig. 5A, a flow diagram of the back-blowing air flow in the ejector 106 when the prior art back-blowing nozzle 107 using a single-hole directional jet is used. Since the nozzle 107 is a single orifice directional jet, the blowback gas it ejects is substantially vertically downwardly flowing.
Although the blowback gas sprayed from the nozzle 107 is diffused to some extent in the downward flow direction, the orientation is good. Therefore, it is difficult to strike the base angle of the diverging section of the ejector 106. Thereby, the bottom corner of the expansion section of the injector 106 forms a dust removing dead angle.
According to the embodiment of the invention, through the structural design that the inclination angle of the outlet end of the direction-adjusting channel 2071b is consistent with the inclination angle of the expansion section 2063 of the injector 206, the main back-blowing ash-cleaning jet ejected from the main channel 2071a can be inclined and offset to the expansion section 2063 of the injector 206 by the high-speed back-blowing ash-cleaning jet ejected from the direction-adjusting channel 2071b in the direction of the second included angle beta. Thus, the main blowback ash removal jet can reach the ash removal dead angle area of the bottom corner of the expansion section 2063. Thereby enlarging the back blowing coverage range of the main back blowing ash cleaning jet flow in the circumferential direction of the end surface of the bottom of the ejector 206 and improving the ash cleaning effect.
As shown in fig. 6A to 6D, the number of the direction-adjusting channels 2071b is determined by the number and arrangement of the filter tubes 202 in a single filter unit, and the number of the direction-adjusting channels 2071b is preferably in the range of 3 to 6. The different numbers of direction-regulating channels 2071b are evenly distributed in the circumferential direction of the back-blowing main pipeline.
As shown in fig. 7A to 7D, the range of the jet flow after the direction adjustment can cover all the filter pipes 202 in the filter unit, and the uneven ash removal degree between the filter pipes 202 in the same filter unit is less than 10%, corresponding to the different number of the direction adjustment channels 2071b in fig. 6A to 6D.
In this embodiment, the cross-sectional shape of the main channel 2071a may be circular or rectangular, and the cross-sectional shape of the corresponding direction-adjusting channel 2071b may also be circular or rectangular, respectively, so as to adapt to pulse back-flushing systems with different arrangements of the filter tubes 202.
The centers of the cross-sectional shapes of the inlet ends of the plurality of direction-adjusting passages 2071b are located on the same plane as the horizontal plane on which the centers of the circles of the rotating rings 2072 are located. In this way, the inlet ends of the plurality of direction-adjusting channels 2071b can be limited to be on the same surface, so that the back-blowing gas can be uniformly discharged through the plurality of direction-adjusting channels 2071b, and the stability and consistency of high-speed back-blowing ash cleaning jet flows sprayed by the plurality of direction-adjusting channels 2071b can be controlled.
Further, the sum of the cross-sectional areas of the inlet ends of the plurality of direction-adjusting channels 2071b is less than half the cross-sectional area of the inlet end of the main channel 2071a, and the sum of the cross-sectional areas of the outlet ends of the plurality of direction-adjusting channels 2071b is also less than half the cross-sectional area of the outlet end of the main channel 2071 a.
For example, the ratio of the sum of the cross-sectional areas of the inlet ends of the plurality of steering channels 2071b to the cross-sectional area of the inlet end of the main channel 2071a may be 10%, 25%, 30%, 40%, 50% or the like. The ratio of the sum of the cross-sectional areas of the outlet ends of the plurality of direction-adjusting passages 2071b to the cross-sectional area of the outlet end of the main passage 2071a may be 10%, 15%, 35%, 45%, 50% or the like.
As shown in fig. 8A to 8D, in the present embodiment, the number of airfoil blades 2072b determines the rotational angular velocity of the rotating ring 2072 to some extent. Specifically, the smaller the number of airfoil blades 2072b, the faster the rotational angular velocity of the rotary ring 2072, the greater the number of revolutions per pulse blowback duration, and the greater the number of ash removal times.
However, at the same time, an increase in the number of airfoil blades 2072b increases the resistance to passage of the pulse back gas, and has an important effect on the flow distribution of the pulse back gas in the pilot channel 2071b and the main channel 2071 a.
Therefore, the number of airfoil blades 2072b has a large influence on the rotational angular velocity of the rotary ring 2072 and the pulse back blow gas passage resistance. The smaller number of airfoil blades 2072b, while reducing the passage resistance of the pulse back-blowing gas, may result in an excessively high rotational angular velocity of the rotating ring 2072. Thus, the frequency with which the steering channel 2071b is opened is high. Accordingly, the time during which the steering channel 2071b is in the open state is also reduced. In this way, the high-speed back-blowing ash jet ejected from the direction-adjusting passage 2071b is small in amount, and it is difficult to offset the main back-blowing ash jet ejected from the main passage 2071 a.
On the contrary, if the number of the airfoil blades 2072b is large, although the amount of the high-speed back-blowing ash removal jet ejected from the direction-adjusting passage 2071b can be increased, the large number of the airfoil blades 2072b increases the passage resistance to the pulse back-blowing gas, and the amount of the main back-blowing ash removal jet ejected from the main passage 2071a is reduced, so that the ash removal effect is difficult to achieve.
In practice, therefore, the number of airfoil blades 2072b should be selected appropriately based on a combination of pulse width and blowback pressure. Preferably, the number of airfoil blades 2072b is in the range of 2 to 5, with different numbers of airfoil blades 2072b being evenly distributed around the circumference of the rotating ring 2072.
Specifically, the plurality of airfoil blades 2072b are arranged in a ring array, one ends of the plurality of airfoil blades 2072b are butted at the center of the rotating ring 2072, and the other ends of the plurality of airfoil blades 2072b are fixed on the inner wall of the rotating ring 2072.
One end of the plurality of airfoil blades 2072b is abutted at the center of the rotating ring 2072, and may be directly and fixedly connected to one end of the plurality of airfoil blades 2072b, for example, by welding, or may be fixed by a connecting ring. And, one end of the plurality of airfoil blades 2072b may be connected to the connection ring by welding, bonding or screwing.
Similarly, the other ends of the plurality of airfoil blades 2072b may be secured to the inner wall of the rotating ring 2072 by welding, adhesive or threading.
In the present embodiment, as shown in fig. 9, the airfoil vane 2072b has a cross-sectional shape of a nearly spindle shape with both sides thin and a slightly thick middle, and all the airfoil vanes 2072b may have the same structure.
The aerodynamic properties of the airfoil vane 2072b are closely related to its geometric parameters. The blade chord length is the length of a straight line at both ends of the tangential plane of the airfoil blade 2072b, and is denoted by c. The blade length refers to the maximum length of the blade in the direction of development, denoted by h.
In order to reduce the passage resistance of the pulse back-blowing gas while obtaining a suitable rotational angular velocity of the rotating ring 2072, the relevant parameters of the airfoil blade 2072b may be designed accordingly.
In particular, the method comprises the steps of,n is the number of airfoil blades 2072b, S in Is the cross-sectional area of the inlet end of the primary channel 2071 a. Wherein the blade chord c x the blade length h may be approximated as the area of the airfoil blade 2072 b.
By this, the blade chord length and the blade length of the airfoil blade 2072b are designed based on the sectional area of the inlet end of the main passage 2071a, i.e., the sectional area of the inlet end of the main passage 2071a serves as the design basis for the blade chord length and the blade length of the airfoil blade 2072b, and the passage resistance of the pulse back-blowing gas can be greatly reduced.
In addition, to increase the amount of high-speed blowback ash removal jet ejected from the direction-adjusting passage 2071b, the maximum cross-sectional area of the notch 2072a of the rotating ring 2072 perpendicular to the radial direction of the rotating ring is greater than or equal to the cross-sectional area of the inlet end of the direction-adjusting passage 2071 b.
Thus, when the rotating ring 2072 is rotated until the notch 2072a communicates with the inlet end of the steering channel 2071b, the inlet end of the steering channel 2071b is completely opened. So that the pulse back-blowing gas can be quickly introduced into the direction-adjusting passage 2071b without being blocked by the rotating ring 2072 to ensure the gas flow rate of the direction-adjusting jet in the direction-adjusting passage 2071 b.
Practice proves that the self-alignment periodic pulse jet nozzle 207 and the filter 200 with the self-alignment periodic pulse jet nozzle 207 can achieve the following technical effects:
(1) The non-uniformity of pulse back-blowing ash removal is improved, and the ash removal efficiency is improved
The filter 200 of the embodiment of the invention can improve the flow distribution of pulse back-blowing gas and the dynamic performance of gas flow in the same filter unit by configuring the self-direction-adjusting periodic pulse jet nozzle 207, and obviously improves the non-uniformity among dozens to dozens of filter pipes 202 in the same filter unit by designing and matching the structures and the sizes of the rotating ring 2072, the direction-adjusting channel 2071b and the main channel 2071a, and under the same condition, the ash cleaning non-uniformity is less than 10%, and the ash cleaning efficiency is improved by more than 8%.
(2) The back-blowing gas consumption and the back-blowing gas pressure are reduced
Because of pulse back blowing, intermittent pulse pressure oscillation waves are generated in each filter pipe 202 at different positions in the circumferential direction of the bottom end surface of the ejector 206. The process is equivalent to that of carrying out ash removal for a plurality of times in one back blowing process, and the ash removal non-uniformity of the single filter pipe 202 along the length direction is greatly improved. At the same time, the secondary deposition of the negative pressure phase near the end of the pulse back-blowing is reduced. Therefore, better ash removal effect can be achieved only by using lower back blowing pressure, and back blowing energy consumption is saved.
(3) Is suitable for the actual working condition with large treatment capacity, and prolongs the service life of the filter tube 202
The improvement of the non-uniformity of the ash removal among different filter pipes 202 in the same filter unit and the non-uniformity of the ash removal of a single filter pipe 202 along the length direction provides the possibility for the increase of the number and the length of the filter pipes 202 in a single filter unit. By utilizing the collision between the high-speed back-blowing ash-cleaning jet ejected from the direction-adjusting channel 2071b and the main back-blowing ash-cleaning jet ejected from the main channel 2071a, the direction of the main back-blowing ash-cleaning jet is adjustable, so that the arrangement mode of a plurality of filter pipes 202 in the same filter unit is more flexible and changeable, and the filter is suitable for round filters and rectangular filters. Meanwhile, the ash removal difference is reduced, so that the possibility of dust bridging among the filter pipes 202 is greatly reduced, and the stable and reliable operation of the filter 200 is ensured.
To better illustrate the effect of the invention, increasing its confidence level and feasibility, a part of test data will now be published.
Experiments were carried out in a self-built high temperature rectangular filter containing 49 filter tubes 202, using the self-alignment periodic pulse jet nozzle 207 of the present invention (containing 3 airfoil blades and 4 alignment channels 2071 b) and the existing single-hole directional jet nozzle, respectively.
Under the same experimental conditions, the dynamic pressure peak in each filter tube 202 was measured at a back-flushing pressure of 0.5MPa and a pulse width of 500ms, as shown in FIG. 10. The standard deviation of the pressure peak in the filter tube 202 was 0.308 when the self-alignment periodic pulse jet nozzle 207 of the present invention was used, and the standard deviation of the pressure peak in the filter tube 202 was 0.849 when the conventional single-hole directional jet nozzle was used. It is apparent that the self-directing periodic pulse jet nozzle 207 of the present invention can significantly improve ash removal non-uniformity.
As shown in fig. 11, the soot cleaning efficiency calculated by using the pressure drop before and after pulse back-blowing of the filter 200 was found to be 88% or more when the self-alignment periodic pulse jet nozzle 207 of the present invention was used, and to be lower than 80% when the conventional single-hole directional jet nozzle was used. It is apparent that the self-directing periodic pulse jet nozzle 207 of the present invention can significantly improve the pulse blowback ash removal efficiency of the filter unit.
It should be noted that, in the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and to distinguish between similar objects, and there is no order of preference between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any numerical value recited herein includes all values of the lower and upper values that increment by one unit from the lower value to the upper value, as long as there is a spacing of at least two units between any lower value and any higher value. For example, if it is stated that the number of components or the value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 21 to 80, more preferably from 30 to 70, then the purpose is to explicitly list such values as 15 to 85, 22 to 68, 43 to 51, 30 to 32, etc. in this specification as well. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are merely examples that are intended to be explicitly recited in this description, and all possible combinations of values recited between the lowest value and the highest value are believed to be explicitly stated in the description in a similar manner.
Unless otherwise indicated, all ranges include endpoints and all numbers between endpoints. "about" or "approximately" as used with a range is applicable to both endpoints of the range. Thus, "about 20 to 30" is intended to cover "about 20 to about 30," including at least the indicated endpoints.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant be deemed to have such subject matter not considered to be part of the disclosed subject matter.
Claims (19)
1. A self-directing periodic pulsed jet nozzle, comprising: a body and a rotating ring; wherein,
The body is provided with a main channel and a direction-adjusting channel positioned outside the main channel; the outlet ends of the main channel and the direction-adjusting channel penetrate through the lower end face of the body; the central axis of the outlet end of the direction-adjusting channel is inclined towards the central axis direction of the main channel, the inner wall of the direction-adjusting channel is in smooth transition, and the middle section of the direction-adjusting channel is arched towards the direction away from the main channel; the cross-sectional area of the direction-regulating channel is gradually reduced along the flow direction of the pulse back-blowing gas; the upper end of the body is downwards recessed at a position corresponding to the main channel to form a mounting groove, and the inlet end of the direction-adjusting channel is formed on the inner wall of the mounting groove;
the rotating ring is arranged at the upper end of the body and is embedded in the mounting groove, the rotating ring corresponds to the main channel, and a notch used for communicating with the direction-adjusting channel is formed in the rotating ring; a plurality of airfoil blades are arranged in the rotating ring;
when ash cleaning operation is executed, the pulse back blowing air can enter the main channel through the rotating ring, and the wing blades are acted by the pulse back blowing air to generate rotating moment so as to drive the rotating ring to rotate; and in the rotating process of the rotating ring, when the notch is communicated with the inlet end of the direction-adjusting channel, part of the pulse back-blowing gas enters the direction-adjusting channel.
2. The self-redirecting periodic pulse-jet nozzle of claim 1, wherein the redirecting channels are a plurality of, the plurality of redirecting channels being arranged in an annular array; and the horizontal plane where the centers of the cross-sectional shapes of the inlet ends of the plurality of direction-adjusting channels are positioned is coplanar with the horizontal plane where the circle centers of the rotating rings are positioned.
3. The self-redirecting periodic pulsed fluidic nozzle of claim 2 wherein a sum of cross-sectional areas of inlet ends of a plurality of said redirecting channels is less than half of a cross-sectional area of an inlet end of said main channel; the sum of the cross-sectional areas of the outlet ends of a plurality of said direction-modifying channels is also less than half the cross-sectional area of the outlet end of said main channel.
4. A self-aligning periodic pulse jet nozzle as in claim 1 wherein the maximum cross-sectional area of said gap perpendicular to the radial direction of said spin ring is greater than or equal to the cross-sectional area of the inlet end of said alignment passage.
5. The self-directing periodic pulse jet nozzle as defined in claim 1, wherein a plurality of said airfoil blades are arranged in an annular array with one end of said airfoil blades abutting at the center of said rotating ring and the other end of said airfoil blades being secured to the inner wall of said rotating ring.
6. A self-directing periodic pulse jet nozzle as defined in claim 1,
the straight line length at the two ends of the tangent plane of the airfoil blade is the chord length of the blade and is marked as c;
the maximum length of the wing-shaped blade along the development direction of the blade is the length of the blade and is marked as h;
then the first time period of the first time period,；
wherein n is the number of the airfoil blades, S in Is the cross-sectional area of the inlet end of the main channel.
7. The self-directing periodic pulse jet nozzle as set forth in claim 1, wherein a lower end surface of said rotary ring is formed with a first groove, and a bottom surface of said mounting groove is formed with a first annular rail groove corresponding to said first groove; and a first ball is clamped between the first groove and the first annular track groove.
8. The self-directing periodic pulse jet nozzle as defined in claim 7, wherein said first recess is arcuate and both ends of said first recess are not in communication with said notch.
9. A self-aligning periodic pulse jet nozzle as defined in claim 7 wherein the relative positions of said first ball and said spin ring are fixed.
10. A self-aligning periodic pulse jet nozzle as claimed in claim 7 or 9 wherein a first frame is secured to a lower end face of the rotating ring, the first frame having a first stop ring in which the first balls are disposed and retained.
11. A self-aligning periodic pulse jet nozzle as claimed in claim 7 or 9 wherein said first recess is circular in cross-section to conform to the shape of said first ball, said first recess and said first ball each being a plurality of balls; the first balls are embedded in the corresponding first grooves and limited.
12. A self-aligning periodic pulsed jet nozzle according to claim 1, wherein the height of said rotating ring is less than the depth of said mounting groove; the upper end of the body is provided with a compression end cover, and the compression end cover is provided with an opening communicated with the rotating ring and the main channel at the central position of the compression end cover; the lower end of the compression end cover is provided with a compression protrusion matched with the mounting groove in a downward extending mode at the position corresponding to the opening, the compression protrusion is embedded into the mounting groove, and the lower end face of the compression protrusion abuts against the upper end face of the rotating ring.
13. The self-aligning periodic pulse jet nozzle as in claim 12 wherein said rotary ring has a second recess formed in an upper end surface thereof and said compression boss has a second annular rail groove formed in a lower end surface thereof corresponding to said second recess; and a second ball is clamped between the second groove and the second annular track groove.
14. A self-aligning periodic pulse jet nozzle as defined in claim 13 wherein said second recess is arcuate and both ends of said second recess are not in communication with said gap.
15. A self-aligning periodic pulse jet nozzle as defined in claim 13 wherein the relative position of said second ball and said spin ring is fixed.
16. A self-aligning periodic pulse jet nozzle as claimed in claim 13 or 15 wherein a second frame is secured to the upper face of the rotating ring, the second frame having a second stop ring in which the second balls are disposed and retained.
17. A self-aligning periodic pulse jet nozzle as claimed in claim 13 or 15 wherein said second recess is circular in cross-section to accommodate the shape of said second ball, said second recess and said second ball each being a plurality of balls; the second balls are embedded in the corresponding second grooves and limited.
18. A filter, comprising:
a shell with an inner accommodating space, wherein a tube plate is arranged in the shell and divides the inner accommodating space of the shell into a dust-containing gas chamber and a clean gas chamber, a plurality of hole collecting units are arranged on the tube plate, and each hole collecting unit comprises a plurality of mounting holes; a plurality of mounting holes are penetrated with filter pipes, the side walls of the filter pipes are provided with continuous and uniform porous channels, the filter pipes are communicated with the dust-containing gas chamber through the continuous and uniform porous channels, and the upper ends of the filter pipes are opened;
The plurality of ejectors are arranged on the tube plate, each ejector corresponds to one hole collection unit, and the filter pipe is communicated with the clean gas chamber through the ejectors;
the first ends of the back-blowing pipes are communicated with a back-blowing air source, and the second ends of the back-blowing pipes extend into the clean gas chamber and correspond to the ejectors one by one;
a self-directing periodic pulse jet nozzle as defined in any one of claims 1 to 17, connected to the second end of the blowback pipe.
19. The filter of claim 18, wherein the eductor comprises a funnel-shaped constriction, a cylindrical throat, and a diverging conical expansion connected in series in the direction of back-blowing gas flow; wherein, a first included angle is formed between a bus of the expansion section and the vertical direction;
the central axis of the outlet end of the direction-regulating channel forms a second included angle with the vertical direction, and the second included angle is consistent with the first included angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910023706.2A CN109621569B (en) | 2019-01-10 | 2019-01-10 | Self-direction-regulating periodic pulse jet nozzle and filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910023706.2A CN109621569B (en) | 2019-01-10 | 2019-01-10 | Self-direction-regulating periodic pulse jet nozzle and filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109621569A CN109621569A (en) | 2019-04-16 |
| CN109621569B true CN109621569B (en) | 2024-02-02 |
Family
ID=66060485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910023706.2A Active CN109621569B (en) | 2019-01-10 | 2019-01-10 | Self-direction-regulating periodic pulse jet nozzle and filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109621569B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018201A (en) * | 2021-11-04 | 2022-02-08 | 河海大学 | Experimental device and method for measuring notch abrasion of impulse turbine |
Citations (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1532302A (en) * | 1975-09-29 | 1978-11-15 | Flex Kleen Corp | Dust collector |
| DE8914966U1 (en) * | 1989-12-21 | 1990-02-15 | Deutsche Babcock Anlagen Ag, 4200 Oberhausen, De | |
| CN1133018A (en) * | 1993-09-03 | 1996-10-09 | 高耶恩控制有限公司 | Bag house cleaning systems |
| DE102007047276A1 (en) * | 2007-10-02 | 2009-04-09 | Intensiv-Filter Gmbh & Co. Kg | Cleaning device for a dust filter |
| WO2011044732A1 (en) * | 2009-10-16 | 2011-04-21 | Han Tiefu | Spin annular slit spray nozzle and spray apparatus thereof |
| CN201894893U (en) * | 2010-11-15 | 2011-07-13 | 科林环保装备股份有限公司 | High-pressure high-efficiency pulse blow pipe |
| CN202028303U (en) * | 2011-04-12 | 2011-11-09 | 凯天环保科技股份有限公司 | Off-line soot cleaning device for dust remover |
| CN102413946A (en) * | 2009-03-04 | 2012-04-11 | 二津化工机械有限公司 | Apparatus for jetting compressed air, and method for manufacturing same |
| CN102500217A (en) * | 2011-12-01 | 2012-06-20 | 西安瑞金源能源科技有限责任公司 | Boiler smoke abatement sweetener |
| CN102728161A (en) * | 2012-07-12 | 2012-10-17 | 中国石油大学(北京) | Pulse reverse-blowing ash-removing device with flexible blowing pipes |
| CN102728162A (en) * | 2012-07-12 | 2012-10-17 | 中国石油大学(北京) | Pulse reverse-blowing ash-removing device with rotary blowing pipes |
| US8297540B1 (en) * | 2011-05-31 | 2012-10-30 | Vln Advanced Technologies Inc. | Reverse-flow nozzle for generating cavitating or pulsed jets |
| CN202700281U (en) * | 2012-07-12 | 2013-01-30 | 中国石油大学(北京) | Pulse back-blowing ash removal device with telescopic blowing pipe |
| CN202700282U (en) * | 2012-07-12 | 2013-01-30 | 中国石油大学(北京) | Pulse back-blowing ash removal device with rotary blowing pipe |
| CN102908840A (en) * | 2012-09-29 | 2013-02-06 | 中国石油大学(北京) | Pulse backflush deashing device for filter |
| CN102961934A (en) * | 2012-11-22 | 2013-03-13 | 中国石油大学(北京) | Self-oscillation nozzle and filter pulse jet cleaning ash-removing device with same |
| CN103007647A (en) * | 2012-12-05 | 2013-04-03 | 中国石油大学(北京) | Filter tube for high-temperature gas-solid separation and filter with same |
| CN202844789U (en) * | 2012-09-29 | 2013-04-03 | 中国石油大学(北京) | Pulse back-blowing ash removal device of filter |
| CN202983430U (en) * | 2012-11-22 | 2013-06-12 | 中国石油大学(北京) | Self-excited oscillation nozzle and filter pulse back-blowing dedusting device with same |
| CN204074302U (en) * | 2014-08-22 | 2015-01-07 | 浙江奥利达气动工具股份有限公司 | Airless spray gun nozzle |
| CN105833623A (en) * | 2016-04-05 | 2016-08-10 | 河南理工大学 | Pulse back-blow dedusting device and gas injector thereof, and filter device |
| CN106669302A (en) * | 2016-10-28 | 2017-05-17 | 韶关市贝瑞过滤科技有限公司 | Filter |
| CN206434968U (en) * | 2017-01-16 | 2017-08-25 | 胡波 | A kind of sack cleaner with deashing device |
| JP2018103186A (en) * | 2018-04-05 | 2018-07-05 | アマノ株式会社 | Oil mist removal device |
| CN108744744A (en) * | 2018-06-13 | 2018-11-06 | 陕西燎原净化设备有限公司 | One kind exempting from the online purge gas cleaner that stops |
| CN209612424U (en) * | 2019-01-10 | 2019-11-12 | 中国石油大学(北京) | From tuning recurrent pulses jet nozzle and filter |
-
2019
- 2019-01-10 CN CN201910023706.2A patent/CN109621569B/en active Active
Patent Citations (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1532302A (en) * | 1975-09-29 | 1978-11-15 | Flex Kleen Corp | Dust collector |
| DE8914966U1 (en) * | 1989-12-21 | 1990-02-15 | Deutsche Babcock Anlagen Ag, 4200 Oberhausen, De | |
| CN1133018A (en) * | 1993-09-03 | 1996-10-09 | 高耶恩控制有限公司 | Bag house cleaning systems |
| DE102007047276A1 (en) * | 2007-10-02 | 2009-04-09 | Intensiv-Filter Gmbh & Co. Kg | Cleaning device for a dust filter |
| CN102413946A (en) * | 2009-03-04 | 2012-04-11 | 二津化工机械有限公司 | Apparatus for jetting compressed air, and method for manufacturing same |
| WO2011044732A1 (en) * | 2009-10-16 | 2011-04-21 | Han Tiefu | Spin annular slit spray nozzle and spray apparatus thereof |
| CN201894893U (en) * | 2010-11-15 | 2011-07-13 | 科林环保装备股份有限公司 | High-pressure high-efficiency pulse blow pipe |
| CN202028303U (en) * | 2011-04-12 | 2011-11-09 | 凯天环保科技股份有限公司 | Off-line soot cleaning device for dust remover |
| US8297540B1 (en) * | 2011-05-31 | 2012-10-30 | Vln Advanced Technologies Inc. | Reverse-flow nozzle for generating cavitating or pulsed jets |
| CN102500217A (en) * | 2011-12-01 | 2012-06-20 | 西安瑞金源能源科技有限责任公司 | Boiler smoke abatement sweetener |
| CN102728161A (en) * | 2012-07-12 | 2012-10-17 | 中国石油大学(北京) | Pulse reverse-blowing ash-removing device with flexible blowing pipes |
| CN102728162A (en) * | 2012-07-12 | 2012-10-17 | 中国石油大学(北京) | Pulse reverse-blowing ash-removing device with rotary blowing pipes |
| CN202700281U (en) * | 2012-07-12 | 2013-01-30 | 中国石油大学(北京) | Pulse back-blowing ash removal device with telescopic blowing pipe |
| CN202700282U (en) * | 2012-07-12 | 2013-01-30 | 中国石油大学(北京) | Pulse back-blowing ash removal device with rotary blowing pipe |
| CN102908840A (en) * | 2012-09-29 | 2013-02-06 | 中国石油大学(北京) | Pulse backflush deashing device for filter |
| CN202844789U (en) * | 2012-09-29 | 2013-04-03 | 中国石油大学(北京) | Pulse back-blowing ash removal device of filter |
| CN102961934A (en) * | 2012-11-22 | 2013-03-13 | 中国石油大学(北京) | Self-oscillation nozzle and filter pulse jet cleaning ash-removing device with same |
| CN202983430U (en) * | 2012-11-22 | 2013-06-12 | 中国石油大学(北京) | Self-excited oscillation nozzle and filter pulse back-blowing dedusting device with same |
| WO2014079160A1 (en) * | 2012-11-22 | 2014-05-30 | 中国石油大学(北京) | Self-oscillating nozzle and pulse-aided back-flushing ash cleaning apparatus of filter equipped with self-oscillating nozzle |
| CN103007647A (en) * | 2012-12-05 | 2013-04-03 | 中国石油大学(北京) | Filter tube for high-temperature gas-solid separation and filter with same |
| WO2014086108A1 (en) * | 2012-12-05 | 2014-06-12 | 中国石油大学(北京) | Filter tube for high-temperature gas-solid separation and filter with same |
| CN204074302U (en) * | 2014-08-22 | 2015-01-07 | 浙江奥利达气动工具股份有限公司 | Airless spray gun nozzle |
| CN105833623A (en) * | 2016-04-05 | 2016-08-10 | 河南理工大学 | Pulse back-blow dedusting device and gas injector thereof, and filter device |
| CN106669302A (en) * | 2016-10-28 | 2017-05-17 | 韶关市贝瑞过滤科技有限公司 | Filter |
| CN206434968U (en) * | 2017-01-16 | 2017-08-25 | 胡波 | A kind of sack cleaner with deashing device |
| JP2018103186A (en) * | 2018-04-05 | 2018-07-05 | アマノ株式会社 | Oil mist removal device |
| CN108744744A (en) * | 2018-06-13 | 2018-11-06 | 陕西燎原净化设备有限公司 | One kind exempting from the online purge gas cleaner that stops |
| CN209612424U (en) * | 2019-01-10 | 2019-11-12 | 中国石油大学(北京) | From tuning recurrent pulses jet nozzle and filter |
Non-Patent Citations (3)
| Title |
|---|
| Gas-particle flows and erosion characteristic of large capacity dry top gas pressure recovery turbine;Liuxi Cai et al.;《Energy》;第120卷;第498-506页 * |
| Strategy and consequence of intermittent segmented pulse-jet cleaning for long-box-shaped filter dust collector;Jianlong Li et al.;《Powder Technology》;第340卷;第311-320页 * |
| 高温过滤器用脉冲反吹喷嘴出口流场特性分析;张星;陈鸿海;姬忠礼;王金宏;;机械工程学报(第10期);第96-100页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109621569A (en) | 2019-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9802147B2 (en) | Filter tube for high temperature gas-solid separation | |
| CN109289375A (en) | A kind of dust-extraction unit and high-temp waste gas processing equipment | |
| CN102908840B (en) | Pulse backflush deashing device for filter | |
| CN102728161A (en) | Pulse reverse-blowing ash-removing device with flexible blowing pipes | |
| CN103055627B (en) | Straight-flow type pre-separating device for high temperature gas filtration and filter of device | |
| CN109621569B (en) | Self-direction-regulating periodic pulse jet nozzle and filter | |
| CN102728162B (en) | Pulse reverse-blowing ash-removing device with rotary blowing pipes | |
| CN111068448B (en) | Gas turbine inlet air filtering device and method | |
| AU2017101842A4 (en) | Cyclone and dip tube for separating a gas | |
| CN209612424U (en) | From tuning recurrent pulses jet nozzle and filter | |
| CN202700282U (en) | Pulse back-blowing ash removal device with rotary blowing pipe | |
| RU2070418C1 (en) | Filter | |
| CN203030137U (en) | Direct current type pre-separation device for filtering high-temperature gas and filter thereof | |
| CN209254329U (en) | Manifold-type pulse backblowing ash-clearing structure and the filter for using the ash-clearing structure | |
| CN214764218U (en) | Microwave frequency vibration high-efficiency dust removing device | |
| CN109224694A (en) | Handle the hollow fiber film assembly and its application structure of gas dusty | |
| CN111905942B (en) | Anti-pollution nozzle | |
| JP2018118212A (en) | Backwashing mechanism, dust collector including the same, backwashing method, and dust collection method | |
| NL2025879B1 (en) | Microporous membrane dust collector for dust removal based on rotary pulse and dust removal method therefor | |
| CN107096334A (en) | One kind filtering tube sheet and pulse backblowing deashing device | |
| CN210121385U (en) | Multistage cyclone gas-liquid separation device | |
| CN109248506B (en) | Manifold type pulse back-blowing ash removing structure and filter using ash removing structure | |
| CN208282677U (en) | A kind of cleaning system of rotary regenerative air preheater | |
| CN105771468B (en) | Pulse backblowing deashing device and its nozzle, filter device | |
| CN206240177U (en) | A kind of gas-solid separator and its denitration dust collecting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |