CN209612424U

CN209612424U - From tuning recurrent pulses jet nozzle and filter

Info

Publication number: CN209612424U
Application number: CN201920040405.6U
Authority: CN
Inventors: 姬忠礼; 栾鑫; 刘震; 刘龙飞
Original assignee: China University of Petroleum Beijing
Current assignee: China University of Petroleum Beijing
Priority date: 2019-01-10
Filing date: 2019-01-10
Publication date: 2019-11-12
Anticipated expiration: 2029-01-10

Abstract

The utility model provides a kind of from tuning recurrent pulses jet nozzle and filter.It should include ontology and rotating ring from tuning recurrent pulses jet nozzle；Ontology has main channel and the tuning channel on the outside of main channel, and the central axial direction of central axis towards the main channel of the outlet end in tuning channel tilts；Rotating ring setting on the body end and it is corresponding with main channel, be provided with notch；And multiple airfoil fans are provided in rotating ring；Pulse backblowing gas can enter main channel through rotating ring, and multiple airfoil fans are acted on by pulse backblowing gas generates turning moment to drive rotating ring to rotate；In rotating ring rotation process, when notch is connected with the arrival end in tuning channel, partial pulse purge gas enters tuning channel.The utility model embodiment can effectively solve the problems, such as in single filter element that the deashing between along the circumferential direction different screen pipes is uneven and single screen pipe deashing is non-uniform at different location along its length.

Description

Self-direction-adjusting periodic pulse jet nozzle and filter

Technical Field

The utility model relates to a gas-solid separation technical field especially relates to a self-modulation is to periodic pulse jet nozzle to and the application or dispose this self-modulation to periodic pulse jet nozzle's filter.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

In industries such as petroleum catalytic cracking, coal chemical industry, biomass gasification, waste incineration and pyrolysis, metallurgy and the like, high-temperature dusty gas is often generated. In order to meet the requirements of different processes and environmental emission standards, the high-temperature dust-containing gas needs to be purified. The high-temperature gas purification technology is used for separating solid particles in gas at the temperature of more than 260 ℃ and separating sulfur dioxide (SO) contained in high-temperature gas₂) Nitrogen Oxide (NO)_x) And removing trace alkali metal, trace heavy metal and other components. The separation of solid particles in dust-containing gas is usually realized by a high-temperature filter, the physical sensible heat, chemical latent heat and kinetic energy of the gas can be utilized to the maximum 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 sintered metal filter tube or a ceramic filter tube and other rigid filter elements which are prepared from porous metal materials or porous ceramic materials. The sintered metal filter pipe 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 both the sintered ceramic filter tube and the sintered ceramic filter tube have better resistance characteristics, 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 the like to form a stable and compact dust layer, and the purified gas enters the subsequent process through the porous channel in the filter element. Wherein the gas filtered by the filter element is called clean gas, and the concentration of solid particles in the gas is small. Along with the filtering process, the dust layer on the outer surface of the filter element is gradually thickened, so that the pressure drop of the filter is continuously increased, the running resistance of the device is increased, and when the pressure drop of the filter is increased to a certain range or the filter runs for a certain time, the circulating regeneration of the filter element is realized by adopting a pulse back flushing mode. During pulse back flushing, high-pressure high-speed back flushing gas enters from the opening end of the filter pipe, the speed energy head of the back flushing gas is gradually converted into a pressure energy head in the axial flow process of the filter pipe and radially flows out through the porous channel of the filter element, the transient energy of the back flushing gas is utilized to overcome the adhesive force between the dust layer and the outer surface of the filter element so as to peel and clear the dust layer, the pressure drop of the filter element is suddenly reduced, the state during initial filtering is basically recovered, and therefore the cyclic regeneration of the performance of the filter element is realized.

The high-efficiency pulse back-blowing mode is an important way for realizing the performance cycle regeneration of the filter element, and the quality of the ash removal performance determines whether the high-temperature gas filter can stably run for a long period. Therefore, the design of the pulse back-flushing ash-cleaning system is particularly important.

The common pulse back-blowing system mainly comprises a compressor, an air storage tank, a pulse back-blowing valve, a pressure regulating valve, a back-blowing pipeline, a nozzle, an ejector and the like, wherein the structure of the nozzle and the ejector and reasonable matching between the nozzle and the ejector are the key for determining the pulse back-blowing performance. In the prior art, in order to simplify the structure of a back-flushing system and reduce the energy consumption of back-flushing gas, a back-flushing form of a single nozzle back-flushing dozens to dozens of filter pipes is adopted in the coal chemical poly-generation technology represented by the Shell coal gasification technology.

Fig. 1A shows a schematic structural diagram and a process flow diagram of a conventional industrial high-temperature filter, which is mainly used for high-temperature and high-pressure working conditions. Taking the Shell coal gasification technology as an example, the technology belongs to the second generation coal gasification technology of entrained flow bed gasification, and dry dust removal is carried out by using a high-temperature filter, wherein the internal operating temperature is 350-40 DEG C0 ℃, the operation pressure is 4.0MPa, the pulse back-blowing ash-cleaning pressure is 7.8MPa, the back-blowing gas temperature is about 225 ℃, and the dust concentration of the purified gas is required to be less than 20mg/Nm³。

As shown in fig. 1A, the tubesheet 103 of the filter 100 sealingly separates the filter into two portions, a lower portion being a dust-laden gas side 104 and an upper portion being a clean gas side 111. The dirty gas enters the dirty gas side 104 of the filter from the gas inlet 101 of the filter 100 and reaches the individual filter units under the influence of the gas thrust. The 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 the dust-containing gas enters the clean gas side 111 after being filtered by the porous channel of the filter tube 102, and is discharged through the gas outlet 105 to enter the subsequent process. As the filtering process proceeds, the dust layer on the outer surface of the filtering pipe 102 gradually thickens, resulting in an increase in pressure drop of the filter 100, and at this time, a back-flushing pulse mode is required to regenerate the performance of the filtering pipe.

When the ash is cleaned by pulse back blowing, the pulse back blowing valve 109 in a normally closed state is opened, the high-pressure nitrogen in the back blowing gas storage tank 110 instantly enters the back blowing pipeline 108 through the connecting pipeline, and then the high-pressure and high-speed back blowing gas is injected into the corresponding ejector 106 through the nozzle 107 at the tail end of the back blowing pipeline 108.

The structure of the ejector 106 is shown in fig. 1B, and is composed of 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 ends of the filter tubes 102 contained within the filter unit are disposed through the tube sheet 103 and are in communication with the eductor 106.

Within a circular filtration unit, the filtration tubes 102 are arranged in an equi-triangular pattern. Because a certain distance exists between the outlet end face of the nozzle 107 and the inlet end face of the injector 106, the high-pressure high-speed back-blowing gas can be injected into the contraction section 112 of the injector 106. A large amount of purified gas in the clean gas side 111 enters along with the back flushing main pulse jet flow, after the purified gas is fully mixed by the throat pipe section 113 and the expansion section 114, the back flushing gas enters the inside of the filter pipe 102 from the opening end of the filter pipe 102, the transient energy is utilized to overcome the adhesive force between the dust layer and the outer surface of the filter pipe 102 so as to peel and clear the dust layer, the pressure drop of the filter pipe 102 is suddenly reduced, the state during the initial filtration is basically recovered, and the cyclic regeneration of the performance of the filter pipe is realized.

Typically 12 or 24 identical filter units are mounted on the tubesheet 103 of the filter. And during pulse back blowing, according to the set back blowing time, after the first group of filter units are back blown, the second group of filter units are back blown after a certain time, and the third group of filter units are back blown after a certain time, so that the operation is repeated in a circulating manner.

At present, in order to meet the process requirement of large treatment gas amount and reduce the energy consumption of back-flushing gas, the number of filter pipes corresponding to each filter unit is developed from more than ten to as much as tens of filter pipes, but in the prior art, a pulse back-flushing device still mainly adopts a nozzle in a single-hole and directional injection mode, and a pulse back-flushing valve can only generate pulse pressure oscillation waves once inside the filter pipes when opened and closed once. Therefore, during the actual operation, the blowback manner of the prior art inevitably causes the following problems:

(1) uneven pulse back-blowing ash removal

Because the nozzle is installed at the tail end of the back flushing 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), the back flushing gas energy with high pressure and high speed is certainly acted on the central area of the filter unit more, in the bottom end face of the ejector, the back flushing gas strength is gradually attenuated from the central position to the vicinity of the peripheral position, finally, the dust cleaning strength of the filter pipe near the central position is high, the dust cleaning strength of the filter pipe near the peripheral position is low, the phenomenon of uneven pulse back flushing dust cleaning is caused, and a dust layer between the filter pipes of the part which is not completely cleaned is bridged due to long-term operation, so that the filter pipes are broken.

(2) High pulse back-blowing pressure and short 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 needs to be improved, so that the filter pipes with lower back-blowing strength and poorer ash removal effect can also achieve more ideal ash removal efficiency, but the overhigh back-blowing pressure can easily cause the strong vibration of the filter pipes near the central position of the filter unit, and because the back-blowing gas temperature is usually far lower than the forward-filtering gas temperature in the filter, the filter pipes can bear larger thermal shock, higher requirements on the mechanical strength and the thermal shock resistance of the filter pipes are provided, the fatigue fracture of the filter pipes can be accelerated in long-term operation, and the service life of the filter pipes is obviously reduced. Meanwhile, the filter pipe with higher blowback strength near the center of part of the filter units can generate excessive ash removal, so that a residual dust layer formed on the outer surface of the filter pipe and used for stable filtration is damaged, the filtration precision of the forward filtration process is obviously reduced within a period of time after blowback is finished, and stable operation of subsequent equipment is not facilitated.

(3) Low efficiency of pulse back-blowing ash removal

At present, in order to meet the industrial practice of large gas treatment volumes, the filtration area of a single filter tube is required to be maximized. With the increasing maturity of filter tube forming technology, the design length of single filter tube is growing gradually. However, after transient energy generated by the blowback airflow enters the filter tube, in the process of energy transfer from the opening end of the filter tube to the blind end, the blowback airflow continuously flows out from the porous channel of the filter tube in the radial direction, so that the energy attenuation of the pulse pressure wave in the filter tube is fast, and the ash removal effect near the blind end of the filter tube in the length direction is poor; if adopt the blowback mode that increases blowback pressure, extension pulse width, then can increase near the open end secondary deposit in the negative pressure stage when the pulse blowback is about to end, lead to the deashing effect near this position relatively poor, no matter how chooseing for use the pulse blowback parameter promptly, will cause single filter tube to make the deashing efficiency of whole filter tube reduce because of local deashing efficiency is lower.

(4) The quantity of back-blowing filter pipes of the same filter unit is small

At present, in order to realize the industrial reality of big treatment capacity, another effective method is to increase the quantity of filter tubes in a single filter unit, but be limited by the inhomogeneous influence of deashing between different filter tubes in current blowback structure and the single filter unit, more filter tube quantity will certainly cause single pulse blowback to have two kinds of unstable operating modes of excessive deashing and incomplete deashing, consequently can only reduce the quantity of filter tubes in the single filter unit, increase the blowback group number in the filter, finally lead to blowback system architecture complicacy, the vulnerable number of pieces such as pulse blowback valve increases, be unfavorable for long-term steady operation of blowback ash removal device.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention, and is set forth for facilitating understanding of those skilled in the art. These solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present invention.

SUMMERY OF THE UTILITY MODEL

Based on aforementioned prior art defect, the embodiment of the utility model provides a self-modulation is to periodic pulse jet nozzle to and the application or dispose this self-modulation to periodic pulse jet nozzle's filter, through set up the mode of transferring to the passageway at blowback main line circumferencial direction, change main pulse jet direction, effectively solve in the single filter unit along the inhomogeneous problem of deashing between the different filter tubes of circumferencial direction, and the inhomogeneous problem of deashing of the different positions departments of length direction of single filter tube edge. Meanwhile, the energy consumption of back flushing gas is reduced, the thermal shock to the filter pipe near the center 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-aligning periodic pulsed waterjet nozzle comprising: the device comprises 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 surface of the body; the central axis of the outlet end of the direction-adjusting channel inclines towards the direction of the central axis 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 being communicated with the direction adjusting channel is formed in the rotating ring; a plurality of wing-shaped blades are arranged in the rotating ring;

when the ash removal operation is executed, pulse back-blowing gas can enter the main channel through the rotating ring, and the plurality of wing-shaped blades generate rotating torque under the action of the pulse back-blowing gas so as to drive the rotating ring to rotate; and in the rotating process of the rotating ring, when the gap 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 diversion channel is in smooth transition, and the middle section of the diversion channel is arched towards the direction far away from the main channel; the cross-sectional area of the direction-adjusting channel is gradually reduced along the flowing direction of the pulse back-blowing gas.

Preferably, the direction-adjusting channels are multiple and are arranged in a circular array; and the horizontal plane of the centers of the cross-sectional shapes of the inlet ends of the plurality of direction-adjusting channels is coplanar with the horizontal plane of the centers of the circles of the rotating rings.

Preferably, the sum of the cross-sectional areas of the inlet ends of the plurality of diversion channels is less than half of the cross-sectional area of the inlet end of the main channel; the sum of the cross-sectional areas of the outlet ends of the plurality of direction-adjusting channels is also smaller than half of the cross-sectional area of the outlet end of the 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 passage.

Preferably, the plurality of airfoil blades are arranged in an annular array, one ends of the plurality of airfoil blades are butted at the center of the rotating ring, and the other ends of the plurality of airfoil blades are fixed on the inner wall of the rotating ring.

Preferably, the lengths of straight lines at two ends of the tangent plane of the airfoil blade are blade chord lengths, and are marked as c;

the maximum length of the airfoil blade along the development direction of the blade is the length of the blade and is marked as h;

then the process of the first step is carried out,

wherein n is the number of the plurality of airfoil blades, S_inThe cross-sectional area of the inlet end of the main channel.

Preferably, the upper end of the body is recessed downwards at a position corresponding to the main channel to form a mounting groove matched with the rotating ring; 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; 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 position of the first ball and the rotating ring is fixed.

Preferably, a first frame is fixed to a lower end surface of the rotating ring, the first frame has a first limit ring, and the first ball is disposed in the first limit ring and is limited.

Preferably, the cross section of the first groove is in a circular shape matched with the shape of the first ball, and the first groove and the first ball are both multiple; the first ball is embedded in the corresponding first groove and limited.

Preferably, the height of the rotating ring is smaller than the depth of the mounting groove; a pressing end cover is arranged at the upper end of the body, and an opening communicated with the rotating ring and the main channel is formed in the center of the pressing end cover; the lower end of the pressing end cover extends downwards at a position corresponding to the opening to form a pressing bulge matched with the mounting groove, the pressing bulge is embedded into the mounting groove, and the lower end face of the pressing bulge abuts against the upper end face of the rotating ring.

Preferably, a second groove is formed on the upper end surface of the rotating ring, and a second annular track groove corresponding to the second groove is formed on the lower end surface 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 position of the second ball and the rotating ring is fixed.

Preferably, a second frame is fixed to an upper end surface of the rotating ring, the second frame having a second limit ring, and the second balls are disposed in the second limit ring and limited.

Preferably, the cross section of the second groove is a circle matched with the shape of the second ball, and the second groove and the second ball are both multiple; the second ball is embedded in the corresponding second groove and is limited.

A filter, comprising:

the device comprises a shell with an internal accommodating space, wherein a tube plate is arranged in the shell and divides the internal accommodating space of the shell into a dust-containing gas chamber and a clean gas chamber, a plurality of hole collection units are arranged on the tube plate, and each hole collection unit comprises a plurality of mounting holes; a plurality of installation holes are formed in the dust-containing gas chamber, and the dust-containing gas chamber is communicated with the dust-containing gas chamber through the installation holes;

the ejector is arranged on the tube plate, each ejector corresponds to one hole set unit, and the filter tube is communicated with the clean gas chamber through the ejector;

the first end of the back flushing pipe is communicated with a back flushing air source, and the second end of the back flushing pipe extends into the clean air chamber and corresponds to the ejectors one by one;

the self-direction-adjusting periodic pulse jet nozzle according to any one of the above embodiments is connected to the second end of the blowback pipe.

Preferably, the ejector comprises a funnel-shaped contraction section, a cylindrical throat section and a gradually-expanding cone-shaped expansion section which are sequentially connected in the flowing direction of the back-blowing gas; the bus of the expansion section forms a first included angle with the vertical direction;

the central axis of the outlet end of the direction-adjusting channel and the vertical direction form a second included angle, and the second included angle and the first included angle tend to be consistent.

The utility model discloses an embodiment filter is through adopting self-alignment to periodic pulse jet nozzle, can adjust the jet direction of blowback gas, increases and draws the gas volume, and extension jet length improves the dynamic behavior that once efflux and secondary drainage gas flow in the ejector, solves the inhomogeneous problem of deashing along the different filtration intertube of circumferencial direction in the single filter unit.

In addition, through the high-speed rotation of the rotating ring, the pulse back-flushing valve is opened and closed once to generate a plurality of intermittent pulse pressure oscillation waves. Effectively solve the inhomogeneous problem of deashing of single filter tube along length direction.

Meanwhile, the defects that secondary deposition, filter pipe vibration and the like are easy to occur in high-pressure back flushing in the prior art are overcome, and the method is particularly suitable for actual working conditions with large treatment capacity and multiple filter pipes.

Moreover, by additionally arranging the direction-adjusting channel, the area of a low-pressure area near the outlet end of the main channel is enlarged, and the flow rate of pulse back-blowing gas at the outlet end of the direction-adjusting channel is faster and the pressure is lower. The sample is favorable for increasing the air flow of secondary drainage, improving the injection effect and prolonging the jet flow length.

Practice proves, the utility model discloses from adjusting to periodic pulse jet nozzle to and the application or dispose this from adjusting to periodic pulse jet nozzle's filter, can gain following technological effect:

(1) the non-uniformity of pulse back-blowing ash removal is improved, and the ash removal efficiency is improved

The utility model discloses the filter, through configuration self-alignment to periodic pulse jet nozzle, can improve the gaseous flow distribution of pulse blowback and the dynamic behavior of gas flow in same filter unit, through rotatory ring, transfer to the design and the matching of passageway and main channel structure, size, the inhomogeneity between making in same filter unit blowback dozens of to dozens of filter tubes obtains showing and improves, under the same condition, the inhomogeneous degree of deashing is less than 10%, deashing efficiency improves more than 8%.

(2) Reduce the back-blowing gas consumption and the back-blowing gas pressure

When pulse back blowing is carried out, multiple intermittent pulse pressure oscillation waves are generated in each filter pipe at different positions in the circumferential direction of the end face of the bottom of the ejector. The ash removal is carried out for a plurality of times in the process of one back blowing, and the ash removal nonuniformity of a single filter tube along the length direction is greatly improved. Meanwhile, the secondary deposition in the negative pressure stage when the pulse back blowing is about to end is weakened. Therefore, a better ash removal effect can be achieved by using lower back-blowing pressure, and the 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 ash removal nonuniformity among different filter tubes and the ash removal nonuniformity of a single filter tube along the length direction in the same filter unit provides possibility for the increase of the number of the filter tubes and the increase of the length in the single filter unit. The collision of the high-speed back-blowing ash-cleaning jet flow of the direction-adjusting channel and the main back-blowing ash-cleaning jet flow of the main channel is utilized to achieve the adjustable direction of the main back-blowing ash-cleaning jet flow, so that the arrangement modes of a plurality of filter pipes in the same filter unit are more flexible and changeable, and the filter unit is suitable for round filters and rectangular filters. Meanwhile, the ash removal difference is reduced, the possibility of bridging dust among the filter pipes is greatly reduced, and the stable and reliable operation of the filter is guaranteed.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope. 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, the proportional sizes, and the like of the respective members in the drawings are merely schematic for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation. In the drawings:

FIG. 1A is a schematic diagram of a high temperature filter according to the prior art;

FIG. 1B is a schematic structural diagram of the ejector in FIG. 1A and the arrangement of the corresponding filter tubes;

fig. 2 is a schematic structural diagram of a filter according to an embodiment of the present invention;

fig. 3A is a schematic structural diagram of a self-aligning periodic pulse jet nozzle according to an embodiment of the present invention;

FIG. 3B is an enlarged partial view of the sliding friction pair between the rotating ring and the body and the pressing end cap of FIG. 3A;

fig. 4A to 4C are top view structural views of the rotary ring of fig. 3A provided with the first groove or the second groove;

FIG. 5A is a schematic view of a single-hole directional jet nozzle for back blowing in the prior art;

FIG. 5B is a schematic diagram of a back-blowing of a self-steering periodic pulse jet nozzle according to an embodiment of the present invention;

fig. 6A to 6D are top view structural diagrams of the body of the embodiment of the present invention when the number of the direction-adjusting channels is different;

fig. 7A to 7D are schematic diagrams of the filtering pipes in the backward jet flow range covering hole set unit in the embodiment of the present invention;

FIGS. 8A to 8D are top view structural views of the rotating ring in FIG. 3A with different numbers of airfoil blades;

FIG. 9 is a schematic view of a cross-sectional configuration of the airfoil blade of FIG. 3A;

FIG. 10 is a comparison of pressure peaks in the filtering pipes of the same filtering unit during back flushing according to the embodiment of the present invention and the prior art;

fig. 11 is a comparison of the ash removal efficiency of the same filter unit in the reverse blowing according to the embodiment of the present invention and the prior art.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments 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 obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present 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 as used herein are for illustrative purposes only and do not denote a single 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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The embodiment of the utility model provides a from alignment periodic pulse jet nozzle 207 to application or configuration should from alignment periodic pulse jet nozzle 207's filter 200.

As shown in fig. 2, the filter 200 of the embodiment of the present invention may include a housing 212 having an inner accommodating space, wherein a tube plate 203 is disposed in the housing 212, and the tube plate 203 separates the inner accommodating space of the housing 212 into a dust-containing gas chamber 204 and a clean gas chamber 211.

As shown in fig. 7A to 7D, the tube sheet 203 is provided with a plurality of hole cluster units 2032, and each hole cluster unit 2032 includes a plurality of mounting holes 2031. The filter pipe 202 is inserted into the mounting hole 2031, a continuous and uniform porous channel is provided on the side wall of the filter pipe 202, the filter pipe 202 is communicated with the dust-containing gas chamber 204 through the continuous and uniform porous channel, and the upper end of the filter pipe 202 is open.

The tube plate 203 is provided with ejectors 206 adapted to the plurality of hole concentration units 2032, and each ejector 206 corresponds to one hole concentration unit 2032. The upper end of the filter tube 202 is inserted into the tube plate 203 and communicates with the ejector 206. Thus, the filter tube 202 communicates with the clean gas chamber 211 through the eductor 206.

In addition, each hole set unit 2032 forms a filter unit together with the filter pipe 202 inserted into the mounting hole 2031 included in the hole set unit 2032 and the ejector 206 coupled to the hole set 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 the dusty gas chamber 204 and the gas outlet 205 communicates with the clean gas chamber 211.

When the filter 200 of the embodiment of the present invention performs the high-temperature dust-containing gas purification operation, the dust-containing gas enters the dust-containing gas chamber 204 through the gas inlet 201 and reaches each filter tube 202 under the action of the gas thrust. The solid particles in the air flow are deposited on the outer surface of the filter tube 202 and form a stable and compact dust layer due to inertial collision, direct interception, and brownian diffusion. The dust-containing gas is filtered through the porous passage of the filter tube 202, enters the clean gas chamber 211, is discharged through the gas outlet 205, and enters the subsequent process.

When the dust layer on the outer surface of the filter pipe 202 is gradually thickened along with the progress of the filtering process, which causes the pressure drop of the filter 200 to be continuously increased and the running resistance of the device to be increased, the pulse back-blowing mode is adopted to realize the cyclic regeneration of the filter pipe 202.

Specifically, the filter 200 according to the embodiment of the present invention is further provided with a blowback pipe 208 adapted to the plurality of injectors 206. Wherein the ejector 206 is connected to the upper end of the filter pipe 202, so that the filter pipe 202 communicates with the clean gas chamber 211 through the ejector 206. The blowback pipe 208 has a first end communicating with a blowback gas source 210 and a second end extending into the clean gas chamber 211 in one-to-one correspondence with the injectors 206.

The back-blowing gas source 210 is specifically a storage tank for storing back-blowing gas, and the back-blowing pipe 208 is provided with a pulse back-blowing valve 209. The second end of the blowback pipe 208 is provided with a self-direction-adjusting periodic pulse jet nozzle 207 corresponding to the top of the ejector 206.

When the ash is cleaned by pulse back blowing, the pulse back blowing valve 209 in a normally closed state is opened, the high-pressure nitrogen in the storage tank instantly enters the back blowing pipe 208 through the connecting pipeline, and then high-pressure and high-speed back blowing gas is sprayed into the corresponding ejector 206 through the self-adjusting direction periodic pulse jet nozzle 207 on the second end of the back blowing pipe 208, so that the ash cleaning operation is realized.

As shown in fig. 3A, the self-redirecting periodic pulse jet nozzle 207 can include a body 2071 and a rotating ring 2072.

In this embodiment, the main body 2071 may be substantially rectangular block-shaped or cylindrical, and has a main channel 2071a and a direction-adjusting channel 2071b located outside the main channel 2071 a. Outlet ends, i.e., lower ends, of the main duct 2071a and the direction-adjusting duct 2071b penetrate through a lower end surface of the body 2071. Thus, the pulse back-blowing gas can be ejected through the main passage 2071a and the outlet end of the direction-adjusting passage 2071 b.

The rotating ring 2072 is formed in a ring shape, and is provided at the upper end of the body 2071 to correspond to the main passage 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 direction-adjusting passage 2071 b. And a plurality of wing blades 2072b are provided in the rotating ring 2072.

When the ash removing operation is performed, the pulse back-blowing gas can enter the main passage 2071a through the rotating ring 2072, and the plurality of wing-shaped blades 2072b generate a rotating torque under the action of the pulse back-blowing gas, so that the rotating ring 2072 is driven to rotate.

Furthermore, during the rotation of the rotating ring 2072, when the gap 2072a is communicated with the inlet end of the direction-adjusting passage 2071b, part of the pulse back-blowing air enters the direction-adjusting passage 2071 b. And finally ejected at high speed from the outlet end of the direction-adjusting passage 2071 b.

In this embodiment, the main 2071a is vertically extended, and the direction-adjusting 2071b is curved. That is, the main 2071a and the turning 2071b are not parallel.

Specifically, the outlet ends of the direction-adjusting passages 2071b are inclined toward the main passage 2071 a. Thus, the high-speed back-blowing deashing jet ejected from the direction-adjusting channel 2071b collides with the main back-blowing deashing jet ejected from the main channel 2071 a. Therefore, under the momentum of the high-speed reverse-blowing deashing jet, the flow direction of the main reverse-blowing deashing jet deflects toward the flow direction of the high-speed reverse-blowing deashing jet ejected from the direction-adjusting channel 2071b, and develops sufficiently inside the ejector 206. Further enlarging the back-blowing coverage of the main back-blowing ash-cleaning jet flow in the circumferential direction of the end surface at the bottom of the ejector 206.

Meanwhile, due to the high-speed rotation of the rotating ring 2072, when the gap 2072a is communicated with the inlet end of the same direction-adjusting channel 2071b on the body 2071 again, the secondary ash removal will be generated on the filter pipe 202 with the same coverage area on 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 times the filter pipes 202 are subjected to pulse cleaning within the same coverage area. Therefore, the periodic ash removal in the single pulse back blowing process can be realized.

From top to bottom, the utility model discloses cross embodiment filter 200, through adopting self-alignment to periodic pulse jet nozzle 207, can adjust the gaseous efflux direction of blowback, increase and draw and penetrate the tolerance, extension jet length improves the dynamic behavior that once efflux and secondary drainage gas flow in the ejector 206, solves the inhomogeneous problem of deashing along the different filter tubes 202 within a single filter unit between the circumferencial direction.

In addition, the high-speed rotation of the rotating ring 2072 realizes that the pulse back-blowing valve 209 is opened and closed once to generate a plurality of intermittent pulse pressure oscillation waves. Effectively solve the inhomogeneous problem of deashing of single filter tube 202 along length direction.

Moreover, 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 velocity of the pulse back-blowing gas at the outlet end of the direction-adjusting passage 2071b is faster and the pressure is lower. Therefore, the secondary drainage gas volume is increased, the injection effect is improved, and the jet flow length is prolonged.

Meanwhile, the defects that secondary deposition, vibration of the filter pipes 202 and the like are easy to occur due to high-pressure back flushing in the prior art are overcome, and the method is particularly suitable for actual working conditions with large treatment capacity and multiple filter pipes 202.

In this embodiment, the direction-adjusting passages 2071b are plural in number. If the number of the gaps 2072a is also plural, when the rotating ring 2072 rotates to a certain position, there may be a case where the plural gaps 2072a communicate with the plural direction-adjusting passages 2071b, respectively, that is, there may be a case where the plural direction-adjusting passages 2071b are turned on. Thus, the high-speed back-blowing deashing jet ejected from the plurality of communicated direction-adjusting channels 2071b interferes with the main back-blowing deashing jet ejected from the main channel 2071a, thereby making the control of the back-blowing gas more complicated.

Moreover, the main back-blowing deashing jet ejected from the main channel 2071a is interfered, so that the deflection direction of the main back-blowing deashing jet possibly generates disorder. Therefore, the directionality of the main back-blowing dust-cleaning jet flow is greatly weakened, the energy of the jet flow is lost, and the dust-cleaning effect is greatly reduced.

In view of this, the number of the gaps 2072a is preferably 1. Then, even if a plurality of direction-adjusting passages 2071b are provided, it is possible to open only 1 direction-adjusting passage 2071b at most at any position during the rotation. Thus, under the action of the high-speed reverse-blowing deashing jet ejected from the opened 1 direction-adjusting channels 2071b, the direction of the main reverse-blowing deashing 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 reverse-blowing deashing jet ejected from the opened 1 direction-adjusting channels 2071 b. Thus, the main back-blowing deashing jet ejected from the main channel 2071a can be deviated stably without being influenced and interfered by other high-speed back-blowing deashing jets. Thus, the control of the blow-back gas is simplified.

Moreover, since only 1 direction-adjusting channel 2071b can be opened at a time, the main back-blowing deashing jet ejected from the main channel 2071a can only be deviated by the high-speed back-blowing deashing jet ejected from the 1 opened direction-adjusting channel 2071b, and the situation that the deflection direction of the main back-blowing deashing jet is disturbed due to the existence of multiple strands of high-speed back-blowing deashing jets can not occur. Therefore, the main back-blowing dust-cleaning jet flow has better directionality, more concentrated energy and greatly improved dust-cleaning effect.

As shown in fig. 3A, in the present embodiment, the rotating ring 2072 is assembled with the body 2071 in such a manner that a mounting groove 2071c adapted to the rotating ring 2072 is formed in a downward depression at a position of the upper end of the body 2071 corresponding to the main passage 2071a, that is, the mounting groove 2071c has a circular cross-sectional shape. An inlet end of the direction-adjusting duct 2071b is formed on an inner wall of the mounting groove 2071c, and the rotating ring 2072 is embedded in the mounting groove 2071 c.

Thus, when the rotating ring 2072 rotates in the mounting groove 2071c, the gap 2072a can communicate with the direction-adjusting passage 2071b formed at the inner wall of the mounting groove 2071c at the inlet end.

In order to reduce frictional resistance between the rotating ring 2072 and the mounting groove 2071c during rotation and enable smooth rotation of the rotating ring 2072, a rolling friction pair may be provided between the lower end surface of the rotating ring 2072 and the bottom surface of the mounting groove 2071 c. Thus, the frictional resistance of the rotating ring 2072 against the mounting groove 2071c during rotation is greatly reduced by rolling friction instead of sliding friction.

Specifically, as shown in fig. 3B, the lower end surface of the rotating ring 2072 may be formed with first grooves 2072c, and the bottom surface of the mounting groove 2071c may be formed with first annular rail grooves 2071d corresponding to the first grooves 2072 c. A first ball 2074 may be interposed between the first concave groove 2072c and the first annular track groove 2071 d.

Since the rotating ring 2072 is provided with the gap 2072a, in order to prevent the first ball 2074 from slipping out through the gap 2072a, a structure for limiting the movement range of the first ball 2074 should be designed.

Specifically, as shown in fig. 4A to 4B, in one embodiment, the first concave groove 2072c may have a circular arc shape, and both ends of the circular arc first concave groove 2072c are not connected to the notch 2072 a. At this time, the central angle of the first concave groove 2072c is smaller than the central angle of the rotating ring 2072. Both ends corresponding to the first recesses 2072c are closed ends, so that when the first ball 2074 rolls to any one end of the first recesses 2072c, it is stopped, and the first ball 2074 does not slip out through the gap 2072 a.

In this embodiment, the first concave grooves 2072c may have a continuous arc shape (as in the embodiment illustrated in fig. 4A). Alternatively, the first concave grooves 2072c may be a plurality of arc-shaped concave grooves arranged intermittently or discontinuously (as in the embodiment shown in fig. 4B).

Also, the number of the first balls 2074 may be plural, and the plural first balls 2074 are spaced apart from each other.

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 grooves 2071d by the rotating ring 2072. The position of the first balls 2074 with respect to the rotating ring 2072 does not change. So that the first ball 2074 does not slip out through the gap 2072 a.

In a specific implementation manner, a first frame may be fixed to the lower end surface of the rotating ring 2072, the first frame has a first limit ring, and the first ball 2074 is disposed in the first limit ring and limited. Thus, the first ball 2074 is restricted by the first stopper ring, so that the first ball 2074 rolls only in the first annular track groove 2071d, and the position with respect to the rotating ring 2072 is not changed.

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, another implementation manner may be that the cross-section of the first concave groove 2072C is a circular shape matched with the shape of the first ball 2074, and the first ball 2074 is embedded in the corresponding first concave groove 2072C and is limited.

In this implementation, the depth of the rounded first grooves 2072c is substantially equal to the radius of the first balls 2074. Thus, the first balls 2074 may be embedded in the first grooves 2072 c. Also, the first ball 2074 is restricted by the first groove 2072c having a circular shape, so that the first ball 2074 rolls only in the first circular track groove 2071d, and the position with respect to the rotating 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 cap 2073 for limiting the rotating ring 2072.

With continued reference to fig. 3A, the rotating ring 2072 has a height less than the depth of the mounting groove 2071 c. Thus, the mounting groove 2071c is located at an inner wall or space above the rotating ring 2072 for the compression cap 2073 to be coupled.

A pressing cover 2073 is provided at an upper end of the body 2071, and the pressing cover 2073 is provided at a central position thereof with an opening 2073a communicating with the rotating ring 2072 and the main passage 2071 a. And, a pressing protrusion 2073b matched with the mounting groove 2071c is formed to extend downward at a position of the lower end of the pressing cover 2073 corresponding to the opening 2073a, and the pressing protrusion 2073b is inserted into the mounting groove 2071 c. The lower end surface of the pressing projection 2073b abuts against the upper end surface of the rotating ring 2072, so that the rotating ring 2072 is vertically restrained.

In this embodiment, the pressing end cap 2073 may be assembled with the body 2071 by means of a threaded connection. Specifically, the inner wall of the mounting groove 2071c above the rotating ring 2072 is provided with an internal thread, and the outer wall of the pressing projection 2073b is provided with an external thread. Thus, the detachable connection of the pressing end cap 2073 and the body 2071 is achieved through the cooperation of the internal and external threads.

Of course, the connection between the pressing end cap 2073 and the body 2071 is not limited to the above manner, and in other possible embodiments, for example, snap connection, welding or adhesion, etc., as long as the pressing end cap 2073 can limit the rotation ring 2072, which is not limited by the embodiment of the present invention.

In addition, the connection between the second end of the blowback pipe 208 and the self-direction-adjusting periodic pulse jet nozzle 207 can also be realized by a threaded connection.

Specifically, in the embodiment where the self-direction-adjusting periodic pulse jet nozzle 207 includes the pressing end cap 2073, the inner wall of the opening 2073a of the pressing end cap 2073 is provided with internal threads, and the outer wall of the second end of the blowback pipe 208 is provided with external threads. Thus, the connection between the blowback pipe 208 and the self-direction-adjusting periodic pulse jet nozzle 207 is realized by the cooperation of the internal and external threads and by the pressing end cap 2073.

In the embodiment where the self-direction-adjusting periodic pulse jet nozzle 207 does not include the pressing end cap 2073, the inner wall of the mounting groove 2071c above the rotating ring 2072 is provided with an internal thread, and the outer wall of the second end of the blowback pipe 208 is provided with an external thread. Therefore, the connection between the blowback pipe 208 and the self-direction-adjusting periodic pulse jet nozzle 207 is realized through the matching of the internal thread and the external thread.

Similarly, the connection between the blowback pipe 208 and the self-direction-adjusting periodic pulse jet nozzle 207 is not limited to the above manner, and in other possible embodiments, such as a snap connection, a welding or an adhesion, the connection between the blowback pipe 208 and the self-direction-adjusting periodic pulse jet nozzle 207 can be achieved, which is not limited by the embodiment of the present invention.

Further, in order to reduce the friction resistance between the rotating ring 2072 and the pressing protrusions 2073b of the pressing end cap 2073 during the rotation process, so that the rotating ring 2072 can rotate smoothly, a rolling friction pair may be provided between the upper end surface of the rotating ring 2072 and the lower end surface of the pressing protrusions 2073 b. Thus, the friction resistance of the rotating ring 2072 against the pressing end cap 2073 during rotation is greatly reduced by rolling friction instead of sliding friction.

Specifically, as shown in fig. 3B, in one embodiment, the upper end surface of the rotating ring 2072 may be formed with second grooves 2072d, and the lower end surface of the pressing projection 2073B may be formed with second annular track grooves 2073c corresponding to the second grooves 2072 d. A second ball 2075 may be interposed between the second groove 2072d and the second annular track groove 2073 c.

As described above, the second concave groove 2072d may have a circular arc shape, and both ends of the second concave groove 2072d are not connected with the gap 2072 a. Also, the second grooves 2072d may have a continuous arc shape. Alternatively, the second grooves 2072d may be a plurality of arc-shaped grooves arranged at intervals or intermittently. Also, the number of the second balls 2075 may be plural, and the plural second balls 2075 are provided at intervals.

Alternatively, in another embodiment, the relative positions of the second balls 2075 and the rotating ring 2072 are fixed.

Also, in a specific implementation, a second frame having a second limit ring in which the second balls 2075 are disposed and limited may be fixed to the upper end surface of the rotating ring 2072.

Or, the cross section of the second groove 2072d is a circle matched with the shape of the second ball 2075, and the second ball 2075 is embedded in the corresponding second groove 2072d and is limited.

In this embodiment, regarding the relevant structure that appears in setting up the rolling friction pair between the up end of rotatory ring 2072 and the lower terminal surface that compresses tightly protruding 2073b, can refer to the above description, the embodiment of the utility model provides a for succinct, do not describe here repeatedly.

As shown in fig. 3A, the direction-adjusting channel 2071b has a certain length and curvature, and adopts a gradual-tapered form with smooth transition to reduce the flow resistance of the pulse blowback gas. Meanwhile, the cross-sectional area of the direction-adjusting channel 2071b is gradually reduced along the flowing direction of the pulse back-blowing gas, so that the flow velocity of the pulse back-blowing gas can be increased, and a larger velocity energy head can be obtained.

Specifically, the contraction degree of the cross-sectional area of the direction-adjusting passages 2071b can be designed according to different working condition requirements such as the number of the direction-adjusting passages 2071b and the flow distribution of the back-blowing gas. Therefore, on the one hand, the loss of the pulse pressure wave propagating in the direction-adjusting channel 2071b can be reduced, and the energy transmission efficiency can be improved. On the other hand, the conversion from static pressure to dynamic pressure in the flow channel of the direction-adjusting channel 2071b is facilitated, the momentum of the jet flow at the outlet of the direction-adjusting channel 2071b is improved, and the adjusting capability of the direction of the main jet flow is enhanced.

Further, the intermediate section of the direction-adjusting passages 2071b is arched away from the main passage 2071a (i.e., radially outward), and the lower ends are gradually curved toward the main passage 2071a (i.e., radially inward). The center axis of the outlet end of the direction-adjusting duct 2071b is inclined toward the center axis of the main duct 2071 a. Thereby, outlet ends of the plurality of direction-adjusting passages 2071b converge toward the main passage 2071 a.

The degree of inclination of the outlet end of the direction-adjusting passage 2071b is related to the angle of inclination of the expanding section 2063 of the eductor 206. Specifically, as shown in fig. 5B, the ejector 206 according to the embodiment of the present invention includes a funnel-shaped contraction section 2061, a cylindrical throat section 2062, and a divergent section 2063 in a divergent cone shape, which are connected in sequence along the flowing direction of the back-blowing gas. Wherein, the generatrix of the expanding section 2063 forms a first included angle α with the vertical direction.

And the central axis of the outlet end of the direction-adjusting passage 2071b forms a second included angle β with the vertical direction. The second included angle β tends to coincide with the first included angle α.

In this embodiment, the second included angle β tends to be consistent with the first included angle α, and may be a difference between the second included angle β and the first included angle α within a predetermined range. For example, the predetermined range is between 0 ° and 10 °. And the second included angle beta is not greater than the first included angle alpha.

It should be noted that the predetermined range can be set according to actual conditions, and mainly refer to the structure of the ejector 206, especially the inclination angle of the expansion section 2063, which is not limited in the embodiment of the present invention.

Fig. 5A shows a flow diagram of the blow-back airflow in the injector 106 when the nozzle 107 of the prior art uses a single-hole directional jet blow-back. Since the nozzle 107 is a single-hole directional jet, the blow-back gas ejected from the nozzle flows substantially vertically downward.

Although the blowback gas from the nozzle 107 is diffused to some extent in the downward flow, it is preferable because of its directionality. Therefore, it is difficult to reach the bottom angle of the expansion section of the ejector 106. Therefore, the bottom angle of the expansion section of the ejector 106 forms a dust cleaning dead angle.

The embodiment of the utility model provides a through the messenger transfer to the exit end inclination of passageway 2071b and the unanimous structural design in expansion section 2063 inclination of ejector 206, then main passageway 2071a spun main blowback deashing efflux can be transferred to passageway 2071b spun high-speed blowback deashing efflux with the orientation of second contained angle beta by the slope skew to the expansion section 2063 of ejector 206. Thus, the main blow-back deashing jet can sweep and reach the deashing dead angle region, the bottom angle of the expansion section 2063. Therefore, the back-blowing coverage range of the main back-blowing ash-removing jet flow in the circumferential direction of the end surface of the bottom of the ejector 206 is enlarged, and the ash-removing effect is improved.

As shown in fig. 6A to 6D, the number of the direction-adjusting passages 2071b is determined by the number and arrangement of the filtering pipes 202 in a single filtering unit, and the number of the direction-adjusting passages 2071b preferably ranges from 3 to 6. Different numbers of direction-regulating channels 2071b are uniformly distributed in the circumferential direction of the back-blowing main pipeline.

As shown in fig. 7A to 7D, the range of the diverted jets corresponding to the different numbers of the direction-adjusting passages 2071b in fig. 6A to 6D can cover all the filtering tubes 202 in the filtering unit, and the ash removal unevenness among the filtering tubes 202 in the same filtering unit is less than 10%.

In this embodiment, the main passage 2071a may have a circular or rectangular cross section, and the corresponding direction-adjusting passages 2071b may also have a circular or rectangular cross section, respectively, so as to adapt to the pulse back-blowing system with different arrangement modes of the filtering pipes 202.

The horizontal plane in which the centers of the cross-sectional shapes of the inlet ends of the plurality of direction-adjusting passages 2071b are located is coplanar with the horizontal plane in which the center of the rotating ring 2072 is located. Thus, the inlet ends of the plurality of direction-adjusting channels 2071b can be defined on the same surface, so that the back-blowing gas can be uniformly discharged through the plurality of direction-adjusting channels 2071b to control the stability and consistency of the high-speed back-blowing deashing jet ejected from the plurality of direction-adjusting channels 2071 b.

Further, the sum of the cross-sectional areas of the inlet ends of the plurality of direction-adjusting passages 2071b is less than half of the cross-sectional area of the inlet end of the main passage 2071a, and the sum of the cross-sectional areas of the outlet ends of the plurality of direction-adjusting passages 2071b is also less than half of the cross-sectional area of the outlet end of the main passage 2071 a.

For example, the ratio of the sum of the sectional areas of the inlet ends of the plurality of direction-adjusting passages 2071b to the sectional area of the inlet end of the main passage 2071a may be 10%, 25%, 30%, 40%, 50%, or the like. The ratio of the sum of the sectional areas of the outlet ends of the plurality of direction-adjusting passages 2071b to the sectional area of the outlet end of the main passage 2071a may be 10%, 15%, 35%, 45%, 50%, etc.

As shown in fig. 8A to 8D, in the present embodiment, the number of the airfoil blades 2072b determines the rotational angular velocity of the rotating ring 2072 to some extent. Specifically, the smaller the number of the airfoil blades 2072b, the faster the rotational angular velocity of the rotating ring 2072, the more the number of rotation cycles per unit duration of the back-flushing pulse, and the more the number of times of ash removal.

However, at the same time, the increase of the number of the wing-shaped blades 2072b increases the resistance of the pulse back-blowing gas to pass through, and has an important influence on the flow distribution of the pulse back-blowing gas in the diversion passage 2071b and the main passage 2071 a.

Therefore, the number of the wing blades 2072b has a large influence on the turning angular velocity of the rotating ring 2072 and the passing resistance of the pulse back blowing gas. The smaller number of the wing blades 2072b can reduce the passing resistance of the pulse back-blowing gas, but can result in an excessively high rotational angular velocity of the rotating ring 2072. Thus, the frequency at which the direction modulation passage 2071b is turned on is high. Accordingly, the time that the direction-adjusting passage 2071b is in the open state is also reduced. Thus, the amount of the high-speed back-blowing deashing jet ejected from the direction-adjusting passage 2071b is small, and it is difficult to offset the main back-blowing deashing jet ejected from the main passage 2071 a.

On the contrary, if the number of the wing-shaped blades 2072b is large, although the amount of the high-speed back-blowing ash-removing jet ejected from the direction-adjusting channel 2071b can be increased, the passing resistance to the pulse back-blowing gas can be increased by the wing-shaped blades 2072b with a large number, the amount of the main back-blowing ash-removing jet ejected from the main channel 2071a is reduced, and the ash-removing effect is difficult to be achieved.

Therefore, in the actual process, the number of the airfoil blades 2072b should be selected according to the magnitude of the pulse width and the blowback pressure. Preferably, the number of the airfoil blades 2072b ranges from 2 to 5, and the airfoil blades 2072b with different numbers are uniformly distributed on the circumference of the rotating ring 2072.

Specifically, a plurality of airfoil blades 2072b are arranged in the form of an annular array, and the one end of a plurality of airfoil blades 2072b docks in the centre of a circle department of rotatory ring 2072, and the other end of a plurality of airfoil blades 2072b is fixed on the inner wall of rotatory ring 2072.

One end of each of the airfoil blades 2072b is butted against the center of the rotating ring 2072, and may be directly and fixedly connected to one end of each of the airfoil blades 2072b, for example, connected together by welding or fixed by a connecting ring. Also, one ends 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 fixed to the inner wall of the rotating ring 2072 by welding, bonding or screwing.

As shown in fig. 9, in the present embodiment, the sectional shape of the airfoil blade 2072b is a nearly spindle shape with two thin sides and a thicker middle, and the structure of all the airfoil blades 2072b can be identical.

The aerodynamic properties of the airfoil blade 2072b are closely related to their geometric parameters. The chord length of the airfoil blade 2072b is the length of the straight line at the two ends of the tangent plane, and is denoted by c. The blade length refers to the maximum length of the blade in the development direction and is denoted by h.

In addition, in order to reduce the passing resistance of the pulse back-blowing gas on the premise that the rotating ring 2072 obtains a suitable rotation angular velocity, the design can be made according to the relevant parameters of the airfoil blade 2072 b.

In particular, the method comprises the following steps of,n is the number of the plurality of airfoil blades 2072b, S_inIs an inlet of the main passage 2071aCross-sectional area of the end. Here, the blade chord length c × the blade length h can be considered as an area of the airfoil blade 2072 b.

Thereby, 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 channel 2071a, that is, the sectional area of the inlet end of the main channel 2071a is used as the design basis of the blade chord length and the blade length of the airfoil blade 2072b, and the passing resistance of the pulse back-blowing gas can be greatly reduced.

In addition, in order to increase the amount of the high-speed blowback soot cleaning jet ejected from the direction-adjusting duct 2071b, the maximum cross-sectional area of the gap 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 duct 2071 b.

Thus, when the rotating ring 2072 rotates until the gap 2072a communicates with the inlet end of the direction-adjusting passage 2071b, the inlet end of the direction-adjusting passage 2071b is fully opened. Therefore, the pulse blowback gas can rapidly enter the direction-adjusting passage 2071b without being obstructed by the rotating ring 2072, so as to ensure the gas flow rate of the direction-adjusting jet flow in the direction-adjusting passage 2071 b.

Practice proves that the self-direction-adjusting periodic pulse jet nozzle 207 and the filter 200 using or configured with the self-direction-adjusting periodic pulse jet nozzle 207 of the embodiment of the utility model can obtain the following technical effects:

The utility model discloses filter 200, from adjusting to periodic pulse jet nozzle 207 through the configuration, can improve the gaseous flow distribution of pulse blowback and the dynamic behavior of gas flow in same filter unit, through rotatory ring 2072, tune to passageway 2071b and main entrance 2071a structure, the design and the matching of size, the inhomogeneity between making blowback dozens of to dozens of filter tubes 202 in same filter unit is showing and is improving, under the same conditions, the inhomogeneous degree of deashing is less than 10%, deashing efficiency improves more than 8%.

(2) Reduce the back-blowing gas consumption and the back-blowing gas pressure

During pulse back flushing, multiple intermittent pulse pressure oscillation waves are generated in each filter pipe 202 at different positions in the circumferential direction of the end face of the bottom of the ejector 206. The ash removal is performed for many times in the process of one back blowing, so that the ash removal nonuniformity of the single filter pipe 202 along the length direction is greatly improved. Meanwhile, the secondary deposition in the negative pressure stage when the pulse back blowing is about to end is weakened. Therefore, a better ash removal effect can be achieved by using lower back-blowing pressure, and the 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 202

The improvement of the ash removal nonuniformity among different filter tubes 202 in the same filter unit and the ash removal nonuniformity of a single filter tube 202 along the length direction provides possibility of increasing the number of filter tubes 202 and the length of the filter tubes in a single filter unit. The collision of the high-speed back-blowing deashing jet ejected from the direction-adjusting channel 2071b and the main back-blowing deashing jet ejected from the main channel 2071a is utilized to achieve the purpose that the direction of the main back-blowing deashing jet is adjustable, so that the arrangement modes of the plurality of filter pipes 202 in the same filter unit are more flexible and changeable, and the filter unit is suitable for round filters and rectangular filters. Meanwhile, the ash removal difference is reduced, the possibility of dust bridging among the filter pipes 202 is greatly reduced, and the stable and reliable operation of the filter 200 is guaranteed.

To better illustrate the effectiveness of the present invention, and to increase its credibility and feasibility, some of the test data are published.

The experiment is gone on in the high temperature rectangle filter who contains 49 filter tubes 202 of putting up by oneself, adopts respectively the utility model discloses a from adjusting to periodic pulse jet nozzle 207 (containing 3 wing section blades and 4 and adjusting to passageway 2071b) and current haplopore directional jet nozzle.

Under the same experimental conditions, the dynamic pressure peak in each filter tube 202 was measured at a blowback pressure of 0.5MPa and a pulse width of 500ms, as shown in FIG. 10. The standard deviation of the pressure peak value in the 49 filter pipes 202 is used as the standard for measuring the uniformity of back flushing, the utility model discloses a when the self-steering periodic pulse jet nozzle 207, the standard deviation of the pressure peak value in the filter pipes 202 is 0.308, and the standard deviation of the pressure peak value in the filter pipes 202 when the existing single-hole directional jet nozzle is used is 0.849. It is apparent that the self-steering periodic pulse jet nozzle 207 of the present invention can significantly improve ash removal non-uniformity.

As shown in FIG. 11, the ash removal efficiency calculated by the pressure drop of the filter 200 before and after pulse back flushing is found, the ash removal efficiency is more than 88% when the utility model is self-adjusting to the periodic pulse jet nozzle 207, and the ash removal efficiency is less than 80% when the existing single-hole directional jet nozzle is adopted. Obviously the utility model discloses a from adjusting to periodic pulse jet nozzle 207 can show the pulse blowback deashing efficiency that improves 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 for distinguishing similar objects, and no order is shown between the two, and no indication or suggestion of relative importance is understood. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 21 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.

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 would 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 should instead 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 hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not intended to forego such subject matter, nor should the applicants be construed as having contemplated such subject matter as being part of the disclosed subject matter.

Claims

1. A self-aligning periodic pulsed jet nozzle, comprising: the device comprises a body and a rotating ring; wherein,

2. A self-redirecting periodic pulsed jet nozzle as recited in claim 1, wherein the inner wall of the redirecting channel transitions smoothly and the middle section of the redirecting channel is bowed away from the main channel; the cross-sectional area of the direction-adjusting channel is gradually reduced along the flowing direction of the pulse back-blowing gas.

3. A self-redirecting periodic pulsed jet nozzle as recited in claim 1 in which there are a plurality of said redirecting channels arranged in an annular array; and the horizontal plane of the centers of the cross-sectional shapes of the inlet ends of the plurality of direction-adjusting channels is coplanar with the horizontal plane of the centers of the circles of the rotating rings.

4. A self-redirecting periodic pulsed jet nozzle as recited in claim 3, wherein the sum of the cross-sectional areas of the inlet ends of a plurality of the redirecting channels is less than half the cross-sectional area of the inlet end of the primary channel; the sum of the cross-sectional areas of the outlet ends of the plurality of direction-adjusting channels is also smaller than half of the cross-sectional area of the outlet end of the main channel.

5. A self-redirecting periodic pulsed waterjet nozzle as claimed in claim 1 wherein the maximum cross-sectional area of the gap perpendicular to the radius of the rotating ring is greater than or equal to the cross-sectional area of the inlet end of the redirecting passage.

6. The self-aligning periodic pulse jet nozzle of claim 1, wherein a plurality of said airfoil vanes are arranged in an annular array, one end of said plurality of airfoil vanes is butted at a center of said rotating ring, and the other end of said plurality of airfoil vanes is fixed to an inner wall of said rotating ring.

7. A self-redirecting periodic pulsed jet nozzle as recited in claim 1,

the lengths of straight lines at two ends of the tangent plane of the airfoil blade are the chord lengths of the blade and are marked as c;

then the process of the first step is carried out,

8. The self-aligning periodic pulse jet nozzle as claimed in claim 1, wherein a mounting groove adapted to the rotating ring is formed by downwardly recessing the upper end of the body at a position corresponding to the main passage; 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.

9. A self-aligning periodic pulse jet nozzle as claimed in claim 8, wherein a first groove is formed on a lower end surface of said rotating ring, and a first annular track groove corresponding to said first groove is formed on a bottom surface of said mounting groove; a first ball is clamped between the first groove and the first annular track groove.

10. A self-aligning periodic pulse jet nozzle as claimed in claim 9 wherein said first recess is arcuate and the ends of said first recess do not communicate with said gap.

11. A self-aligning periodic pulse jet nozzle as in claim 9 wherein the relative position of said first ball and said rotating ring is fixed.

12. A self-aligning periodic pulse jet nozzle as claimed in claim 9 or 11, wherein a first frame is fixed to a lower end surface of said rotating ring, said first frame having a first stopper ring, said first balls being disposed in said first stopper ring and being stopped.

13. A self-aligning periodic pulse jet nozzle as claimed in claim 9 or 11 wherein said first recess is circular in cross-section to match the shape of said first ball, and there are a plurality of said first recesses and said first ball; the first ball is embedded in the corresponding first groove and limited.

14. A self-aligning periodic pulsed waterjet nozzle as claimed in claim 8 wherein the height of said rotating ring is less than the depth of said mounting groove; a pressing end cover is arranged at the upper end of the body, and an opening communicated with the rotating ring and the main channel is formed in the center of the pressing end cover; the lower end of the pressing end cover extends downwards at a position corresponding to the opening to form a pressing bulge matched with the mounting groove, the pressing bulge is embedded into the mounting groove, and the lower end face of the pressing bulge abuts against the upper end face of the rotating ring.

15. A self-aligning periodic pulse jet nozzle as claimed in claim 14, wherein an upper end surface of said rotating ring is formed with a second groove, and a lower end surface of said pressing projection is formed with a second annular rail groove corresponding to said second groove; and a second ball is clamped between the second groove and the second annular track groove.

16. A self-aligning periodic pulse jet nozzle as claimed in claim 15 wherein said second slot is arcuate and wherein the ends of said second slot do not communicate with said gap.

17. A self-aligning periodic pulse jet nozzle as in claim 15 wherein the relative position of said second ball to said rotating ring is fixed.

18. A self-aligning periodic pulse jet nozzle as claimed in claim 15 or 17 wherein a second frame is fixed to an upper end surface of said rotating ring, said second frame having a second retaining ring, said second balls being disposed in said second retaining ring and retained thereby.

19. A self-aligning periodic pulsed jet nozzle as claimed in claim 15 or 17 wherein said second recess is circular in cross-section to match the shape of said second ball, and there are a plurality of said second recesses and said second ball; the second ball is embedded in the corresponding second groove and is limited.

20. A filter, comprising:

the self-steering periodic pulsed waterjet nozzle of any one of claims 1 to 19 connected to a second end of the blowback pipe.

21. The filter of claim 20, wherein the eductor comprises, in the reverse blow gas flow direction, a funnel-shaped constriction section, a cylindrical throat section, and a diverging cone-shaped expansion section connected in sequence; the bus of the expansion section forms a first included angle with the vertical direction;