CN102908840B - Pulse backflush deashing device for filter - Google Patents
Pulse backflush deashing device for filter Download PDFInfo
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- CN102908840B CN102908840B CN201210376524.1A CN201210376524A CN102908840B CN 102908840 B CN102908840 B CN 102908840B CN 201210376524 A CN201210376524 A CN 201210376524A CN 102908840 B CN102908840 B CN 102908840B
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Abstract
The invention discloses a pulse backflush deashing device for a filter. Filtering units are arranged on a pipe plate of the filter, and the pipe plate divides the filter into a clean gas cavity and a dusty gas cavity in a sealing manner. The pulse backflush deashing device comprises ejectors arranged at the upper parts of the filtering units, and backflush pipelines matched with the ejectors, wherein one end of each backflush pipeline is communicated with a backflush gas storage tank through a pulse backflush valve, and a direction-adjusting multi-hole jet nozzle according to the top part of each ejector is arranged at the other end of each backflush pipeline. As the pulse backflush deashing device adopts the direction-adjusting multi-hole jet nozzles with the jet directions being adjustable, the jet direction of backflush gas can be adjusted, the jet length can be extended, and a primary jet flow and a secondary jet flow are mixed uniformly by multiple high speed jet flows, so that the distribution statuses of backflush gas flows entering the ejectors can be improved, the diffusion loss is reduced, the energy transmission efficiency can be improved, and the deficiencies, such as non-uniformity of pulse backflush, as well as gas flow eccentricity and filter pipe vibration that are brought by the existing jet nozzles, are overcome.
Description
Technical field
The invention relates to a kind of gas-solid separating device, relate to a kind of pulse backblowing deashing device of filter, relate in particular to a kind of pulse backblowing deashing device with tuning formula multiple jet nozzle.
Background technology
In the industries such as chemical industry, oil, metallurgy, electric power, often produce high-temperature dusty gas; Because different process need to recover energy and reach environmental emission standard, all need these high-temperature dusty gas to carry out dedusting.Gas cleaning at high temperature is under hot conditions, directly to carry out gas solid separation, realizes a technology of gas purification, and it can farthest utilize the physics sensible heat of gas, potential chemical heat and kinetic force, improve energy utilization rate, process simplification simultaneously, saves equipment investment.
In the most potential current clean coal technology, take integrated gasification combined cycle plants (IGCC) and pressurized fluidized bed combined cycle for power generation (PFBC CC) as the various coal fired power generation technology of representative with all to relate to the dust removal problem of high-temperature gas in the leading Coal Chemical Industry Poly-generation technology of coal gasification.The Clean Coal Power Generating Technologies such as IGCC are exactly high-temperature purification of gas in the common difficulty running in commercialized development process, and its object one is protection gas turbine blades and upstream device, and the 2nd, make the flue gas of discharging meet environmental protection standard.
The rigidity high temperature filtration elements such as sintering metal chimney filter and ceramic chimney filter, have good anti-seismic performance, high temperature resistant, corrosion-resistant and thermal shock resistance properties, have higher filtering accuracy and filter efficiency simultaneously, are therefore widely used in high temperature gas cleaning field.Take High Temperature Ceramic Filter as example, can remove particles more than 5 μ m, outlet dust content is less than 5mg/Nm
3, separative efficiency reaches 99.9%.
Pulse backblowing deashing device is the important guarantee of high-temperature gas filter stable operation.As shown in Figure 7 A, the Pulse anti-blow device of filter is mainly made up of purge gas storage tank 91, pulse backblowing valve 92, blowback pipeline 911, nozzle 912 and injector 93 for the filter of existing commercial Application and Pulse anti-blow device structure thereof; The tube sheet 94 of filter is clean gas side and ash-laden gas side by the inner space sealed separation of filter; A filter element forms (48 chimney filters are installed in a common filter element) by many chimney filters 95, and each filter element shares an injector 93; In circular filter element, chimney filter according to etc. triangular pattern arrange; 12 or 24 filter elements are conventionally installed on the tube sheet 94 of filter.
Dusty gas (or being called crude synthesis gas) is entered the ash-laden gas side of filter by the gas access 96 of filter, under the effect of the gas push power of HTHP, arrive each filter element, particle in air-flow is intercepted at the outer surface of chimney filter 95, form muffin layer, after gas filters by the porous channel of chimney filter, enter the shared air chamber being formed by injector 93, enter afterwards clean gas side, discharge and enter subsequent technique through gas vent 97.Along with the carrying out of filter operation, the muffin layer progressive additive of chimney filter 95 outer surfaces, cause the pressure drop of filter to increase, at this moment need to adopt the mode of pulse backblowing to realize the quality rebuilding of chimney filter, when pulse backblowing deashing, open in the pulse backblowing valve 92 of normally off that (opening/closing time of pulse valve is very short, belong to transient process, be generally 200ms 300ms), high pressure nitrogen in gas reservoir 91 or Clean synthesis gas moment enter in blowback pipeline 911, then the purge gas to corresponding injector 93 internal spray high-voltage high-speeds by pipeline top nozzle 912, simultaneously under the ejector action of injector 93, can introduce a large amount of gas and together enter from clean gas side the inside of injector 93, mixed purge gas is through chimney filter 95 inwalls, utilize the energy of transient state that the dust layer of chimney filter outer surface is peeled off, make the resistance of chimney filter substantially return to original state, thereby realize the quality rebuilding of chimney filter.The dust of peeling off falls into ash bucket 97, regularly removes.In above-mentioned technique, filter operation temperature is about 340 ℃, and operating pressure is about 4MPa, and pulse dust cleaning pressure is about 8MPa, and purge gas temperature is greater than 225 ℃.
In above-mentioned existing Pulse anti-blow device, nozzle arrangements mainly adopts single hole, fixed-direction spray regime; This nozzle arrangements is unfavorable for the long-period stable operation of filter, mainly has following problem:
(1) pulse backblowing deashing is inhomogeneous.
When pulse backblowing, when " jet " of nozzle ejection high-voltage high-speed enters the openend 931 of injector 93 (as shown in Figure 7 B), under " secondary drainage " effect of injector 93, introduce a large amount of gas from the clean gas side of filter, both are after trunnion 932 mixes, jointly enter diffusion chamber 933, enter afterwards in each chimney filter 95, the chimney filter of this unit is carried out to deashing.Jet direction during due to winding-up is the center that faces filter element, the blowback air stream energy of this injection method will certainly more act on filter element center, make near the chimney filter of center and the chimney filter ash-removal effect of marginal position widely different, chimney filter near center bears larger gas shock power, easily cause fatigue fracture, the chimney filter deashing dynamics of marginal position is less, the dust layer that is attached to chimney filter surface is difficult for being removed by blowback air-flow, there is incomplete deashing phenomenon, the dust layer causing between chimney filter is built bridge, cause the fracture failure of chimney filter.
(2) blowback air-flow bias causes injector to damage and chimney filter vibration.
The purge mode of the fixing jet direction of existing single hole, " secondary drainage " amount when increasing blowback, require the exit end face of nozzle to maintain a certain distance with the entrance face of injector, can reach certain blowback effect, this distance is generally 350400mm; Gas pressure during due to pulse backblowing, up to 8MPa, very easily causes the vibration of back-blowing device, causes winding-up pipeline and nozzle to rock, and under so long winding-up distance, rocks the bias that also can cause blowback air-flow even less.For existing industrial injector, the length of its trunnion part 932 is long (is because jet length and the ejector capacity of the existing nozzle of sub-thread jet are limited, so require length of throat long, so that the mixing of flowed energy) and diameter less (in order to prevent the energy dissipation of sub-thread jet), while there is bias in the blowback air-flow of high-voltage high-speed, can cause the erosion of injector to damage (askew situation of blowing down even occurred to be blown the injector of on-the-spot application), can cause stronger impact to the stressed chimney filter compared with concentrated position of this filter element simultaneously, cause the strong vibration of chimney filter, the ability of anti-deformation of pottery chimney filter is poor, easily cause chimney filter fatigue fracture, although sintering metal chimney filter has compared with obdurability, but also easily impacted and damaged.
(3) reverse gas cleaning intensity and cleaning efficiency are low.
Ash-removal effect is mainly reflected on deashing intensity and cleaning efficiency; The pressure peak that can reach in chimney filter in blowback process is to weigh the important indicator of ash-removal effect.Pressure peak refers to pulse jet moment, the maximum pressure that the deashing air-flow of back-blowing device ejection produces in the inside of chimney filter, and pressure peak is high can realize good ash-removal effect.For existing back-blowing device, distant due to nozzle and injector, the limited length of " jet " when nozzle winding-up, although energy is concentrated.But inhomogeneous while mixing in the trunnion position of injector with " secondary jet ", energy exchange and transmission efficiency are lower, make the pressure peak in blowback process chimney filter lower, affect deashing intensity and cleaning efficiency.
(4) average blowback economic performance is low.
Blowback economic performance is defined as: in Pulse Cleaning, the ratio of the pressure peak that can reach in chimney filter and the backflowing gas amount of consumption, has reflected the blowback effect that the purge gas of consumption unit mass can reach.Average blowback economic performance refers to the chimney filter blowback economic performance mean value in filter element.The gas energy of " jet " and " secondary drainage " has determined the pressure peak in chimney filter jointly.Industrial high-temperature gas filter adopts pure nitrogen or Clean synthesis gas as blowback source of the gas more, the production cost costliness of purge gas.Because the energy Main Function of the single hole jet nozzle of above-mentioned routine is in the chimney filter near filter element center position, consume so in the situation of certain backflowing gas amount, the ash-removal effect of the chimney filter of marginal position is had a greatly reduced quality, simultaneously again because " jet " of prior art is limited in one's ability, cause pressure peak lower, therefore reduced average blowback economic performance.
Thus, the inventor relies on experience and the practice of being engaged in for many years relevant industries, proposes a kind of pulse backblowing deashing device of filter, to overcome the defect of prior art.
Summary of the invention
The object of the present invention is to provide a kind of pulse backblowing deashing device of filter, adopt the adjustable multiple jet nozzle of jet direction, can adjust jet direction, extend jet length, utilize multiply high-speed jet that jet and secondary drainage are mixed, the air-flow distribution situation can improve purge gas and enter injector time, reduces divergence loss, improve the energy transfer efficiency of injector, overcome the defect such as air-flow bias and chimney filter vibration that existing jet nozzle brings.
The object of the present invention is achieved like this, a kind of pulse backblowing deashing device of filter, and the tube sheet of described filter is provided with filter element, and filter seal is divided into the clean gas chamber on top and the dusty gas chamber of bottom by filter tube sheet; Described pulse backblowing deashing device includes the injector of filter element top setting and the blowback pipeline corresponding with injector, blowback pipeline one end is communicated in blowback air accumulator by pulse backblowing valve, and the blowback pipeline other end is provided with the tuning formula multiple jet nozzle of setting corresponding to injector top.
In a preferred embodiments of the present invention, the tube sheet of described filter is provided with many group filter elements; The injector top of every group of filter element respectively correspondence arranges a blowback pipeline.
In a preferred embodiments of the present invention, described tuning formula multiple jet nozzle is made up of the nozzle body being fixedly connected with the blowback pipeline other end and the multiple shower nozzles that are fixedly installed on nozzle body bottom; Described shower nozzle includes the head body that is fixedly communicated with nozzle body, be connected in clip-on cap in head body and one end fixed clamp other end between head body and clip-on cap passes the jet pipe of clip-on cap.
In a preferred embodiments of the present invention, between described head body and clip-on cap, form an interior concave spherical grasping part; The spherical clamping part that described jet pipe one end external connects, described spherical clamping part fixed clamp is in described spheric grasping part and form a spherical joint.
In a preferred embodiments of the present invention, described jet pipe and spherical clamping part are one-body molded.
In a preferred embodiments of the present invention, described jet pipe inside forms the runner of level and smooth convergent to the port of export.
In a preferred embodiments of the present invention, described nozzle body comprises the connected chamber with the conducting of the blowback pipeline other end, and connected chamber bottom is connected with shower nozzle by the truncated cone-shaped duct of convergent respectively.
In a preferred embodiments of the present invention, described multiple truncated cone-shaped duct is uniformly distributed around connected chamber bottom.
In a preferred embodiments of the present invention, in the truncated cone-shaped duct of annular spread, central part is also provided with a truncated cone-shaped duct.
From the above mentioned, in the pulse backblowing deashing device of filter of the present invention, adopt the adjustable tuning formula of jet direction multiple jet nozzle, can adjust the jet direction of purge gas, extend jet length, by multiply high-speed jet, jet and secondary drainage are evenly mixed, air-flow distribution situation can improve thus purge gas and enter injector time, reduce divergence loss, improve the energy transfer efficiency of injector, inhomogeneities while overcoming pulse backblowing, has also overcome the defect such as air-flow bias and vibration that existing jet nozzle brings.
Accompanying drawing explanation
The following drawings is only intended to the present invention to schematically illustrate and explain, not delimit the scope of the invention.Wherein:
Fig. 1: be the structural representation of the pulse backblowing deashing device of filter of the present invention.
Fig. 2: be the structural representation of tuning formula multiple jet nozzle in the present invention.
Fig. 3 A: the structural representation when jet pipe is 0 ° in tuning formula multiple jet nozzle.
Fig. 3 B: the structural representation when jet pipe is 15 ° in tuning formula multiple jet nozzle.
Fig. 4 A～Fig. 4 I: for multiple shower nozzles are at nozzle body bottom distribution mode structural representation.
Fig. 5: be the structural representation of injector in the present invention.
Fig. 6: be the schematic diagram of chimney filter in the stream range covering filter element of shower nozzle in the present invention.
Fig. 7 A: be the structural representation of existing filter.
Fig. 7 B: be the schematic diagram of arranging of filter element in existing filter.
Fig. 8: under high temperature actual condition, the pressure peak in the chimney filter of Pulse anti-blow device of the present invention and existing back-blowing device correction data figure.
Fig. 9: under high temperature actual condition, the cleaning efficiency of the chimney filter of Pulse anti-blow device of the present invention and existing back-blowing device correction data figure.
The specific embodiment
Understand for technical characterictic of the present invention, object and effect being had more clearly, now contrast accompanying drawing explanation the specific embodiment of the present invention.
The present invention proposes a kind of pulse backblowing deashing device of filter, and as shown in Figure 1 and Figure 2, the tube sheet 5 of described filter is provided with filter element, and in the present embodiment, described tube sheet is provided with many group filter elements, is provided with many chimney filters 6 in every group of filter element; Filter seal is divided into the clean gas chamber on top and the dusty gas chamber of bottom by filter tube sheet 5, dusty gas is entered the dusty gas chamber of filter by the gas access 71 of filter, particle in air-flow is intercepted at the outer surface of chimney filter 6, form muffin layer, after gas filters by the porous channel of chimney filter, enter clean gas chamber, discharge and enter subsequent technique through gas vent 72; Described pulse backblowing deashing device includes the injector 4 of filter element top setting and the blowback pipeline 2 corresponding with injector, blowback pipeline 2 one end are communicated in blowback air accumulator 1 by pulse backblowing valve 21, and blowback pipeline 2 other ends are provided with the tuning formula multiple jet nozzle 3 with the injector 4 corresponding settings in top; In the present embodiment, injector 4 tops of every group of filter element respectively correspondence one blowback pipeline 2 is set.Described tuning formula multiple jet nozzle 3 is made up of the nozzle body 31 being fixedly connected with blowback pipeline 2 other ends and the multiple shower nozzles 32 that are fixedly installed on nozzle body 31 bottoms; Described shower nozzle 32 includes the head body 321 that is fixedly communicated with nozzle body 31, be connected in clip-on cap 322 in head body 321 and one end fixed clamp other end between head body 321 and clip-on cap 322 passes the jet pipe 323 of clip-on cap 322; Between described head body 321 and clip-on cap 322, form an interior concave spherical grasping part; The spherical clamping part 324 that described jet pipe 323 one end external connect, described spherical clamping part 324 fixed clamp are in described spheric grasping part and form a spherical joint; Because spherical joint can be adjusted direction arbitrarily, therefore, jet pipe 323 can be adjusted jet direction by spherical joint.
From the above mentioned, in the pulse backblowing deashing device of filter of the present invention, adopt the adjustable tuning formula of jet direction multiple jet nozzle, can adjust the jet direction of purge gas, extend jet length, by multiply high-speed jet, jet and secondary drainage are evenly mixed, air-flow distribution situation can improve thus blowback air and flow to into injector time, reduce divergence loss, improve the energy transfer efficiency of injector, inhomogeneities while overcoming pulse backblowing, has also overcome the defect such as air-flow bias and chimney filter vibration that existing jet nozzle brings.
Further, as shown in Figure 2, in the present embodiment, described jet pipe 323 inside form the runner of level and smooth convergent to the port of export; Make the runner of outlet less than the runner of entrance, the degree that jet pipe 323 inner flow passages shrink can design according to different working condition requirements.Due to the runner convergent of outlet, can air pulse rapid expanding when ejection, improve effluxvelocity and jet ability, because the flow velocity of a jet is high, the ability of its injection secondary jet is strong, can improve thus injection effect; Because the runner of jet pipe 323 inside is the tapering type of rounding off, therefore can reduce air-flow by time frictional resistance.
In the present embodiment, described spherical clamping part 324 is provided with the manhole of perforation, and jet pipe 323 is communicated in this through hole; Described jet pipe 323 and spherical clamping part 324 can be one-body molded, also can adopt Split type structure to be threaded connection, to facilitate the jet pipe 323 of changing inner flow passage different structure according to designing requirement.
In the present embodiment, as Fig. 3 A, shown in Fig. 3 B, head body 321 adopts and is threaded with clip-on cap 322, spherical clamping part 324 is placed in interior concave spherical grasping part and adjusts after the jet direction needing, head body 321 and clip-on cap 322 are screwed, spherical clamping part 324 is just clamped fixing (after nozzle installed, in the process of normal work, in fact the angle of each jet pipe is just fixed, because stream distance and angle need to be according to condition calculating, high temperature and high pressure condition can not be accomplished automatic direction regulating, and there is no need automatic direction regulating.In the time that process conditions change, just can in the time stopping, be operated, make it to work under optimum distance and angle automatching), be linear sealing mode due to what adopt between spherical clamping part 324 and interior concave spherical grasping part, therefore in, blowback process, can there is not Leakage Gas.In the present embodiment, jet direction angle adjustment scope is 0～30 °, 0 ° of position when being defined as jet pipe 323 and exporting vertically downward.
Further, as shown in Figure 2, in the present embodiment, described nozzle body 31 comprises the connected chamber 311 being connected with 2 other end conductings of blowback pipeline, and connected chamber 311 bottoms are connected with shower nozzle 32 by the truncated cone-shaped duct 312 of convergent respectively.In the present embodiment, the shower nozzle 32 that described nozzle body 31 bottoms connect is 3～7.
Described multiple shower nozzle has following two kinds in the distribution mode of nozzle body 31 bottoms: (1) described multiple truncated cone-shaped duct is around connected chamber bottom even circumferential distribution (as shown in Fig. 4 A, 4B, 4D, 4F and 4H); (2) described multiple truncated cone-shaped duct distributes around connected chamber bottom even circumferential, and is also provided with a truncated cone-shaped duct (as shown in Fig. 4 C, 4E, 4G and 4I) at the truncated cone-shaped duct of annular spread central part.When gas enters nozzle, what first enter is columniform connected chamber 311, it is mainly the transition in order to form a connecting link that this connected chamber 311 acts on, then the duct 312 that blowback air stream passes through inverted round stage structure is (in connected chamber 311 inside of circular cross-section, the entrance of each inverted round stage approaches tangent state), enter again the gas channel of head body 321, finally spray from jet pipe 323.Adopt the pore passage structure of inverted round stage, can farthest reduce the air flow losses of airflow collision on connected chamber 311 inwalls, meanwhile, because truncated cone-shaped duct 312 is tapering type passages, also reach the flow velocity that has promoted purge gas, increased the object of the kinetic energy of purge gas.
The present invention compared with prior art has following beneficial effect:
(1) improve air-flow distribution situation when blowback air flows to into injector, reduced divergence loss, the inhomogeneities while having overcome pulse backblowing.
(2) injector erosion damage that air-flow bias brings and the vibration problem of chimney filter have been reduced.
(3) can be according to different Operating condition adjustment jet directions, extend jet length, utilize multiply high-speed jet that jet and secondary drainage are mixed, significantly improve deashing intensity.Under identical condition, deashing strength ratio prior art improves 26%～32%.
(4) improved cleaning efficiency, under identical condition, cleaning efficiency can promote 12%～17%.
Be specifically described as example so that 7 shower nozzles to be set in tuning formula multiple jet nozzle below, the arrangement mode of described shower nozzle is around nozzle body bottom even circumferential 6 shower nozzles that distribute, and at 6 shower nozzle central parts of annular spread, 1 shower nozzle is set.The flow angle of 6 shower nozzles of annular spread is 20 ° (that is: tilting 20 ° to nozzle body bottom periphery respectively), and the distance (being the top of injector and the vertical range of nozzle end) of winding-up is 50mm.
As shown in Figure 1, dusty gas is entered the dusty gas chamber of filter by the gas access 71 of filter, under the effect of the gas push power of HTHP, arrive each filter element, each filter element shares an injector, the outer surface that dust granules thing in air-flow is intercepted at chimney filter 6 forms muffin layer, and gas enters subsequent technique by the porous channel of chimney filter.Along with the carrying out of filter operation, the muffin layer progressive additive of chimney filter 6 outer surfaces, cause the pressure drop of filter to increase, at this moment need to adopt the mode of pulse backblowing to realize the quality rebuilding of chimney filter, when pulse backblowing deashing, open in the pulse backblowing valve 21 of normally off that (opening/closing time of pulse valve is very short, belong to transient process, be generally 200ms-300ms), high pressure nitrogen in gas reservoir 1 or Clean synthesis gas moment enter in blowback pipeline 2, then raise the purge gas to formula multiple jet nozzle 3 to corresponding injector 4 internal spray high-voltage high-speeds by winding-up pipeline, simultaneously under the ejector action of injector, can introduce a large amount of gas and together enter from clean gas chamber the inside of injector, mixed purge gas is through chimney filter 6 inwalls, utilize the energy of transient state that the dust layer of chimney filter outer surface is peeled off, make the resistance of chimney filter substantially return to original state, thereby realize the quality rebuilding of chimney filter.The dust of peeling off falls into ash bucket 8, regularly removes.
For above-mentioned Pulse Cleaning, purge gas enters tuning formula multiple jet nozzle via winding-up pipeline, in nozzle interior behind the truncated cone-shaped duct 312 and the tapering type inner passage of jet pipe 323 of nozzle body 31, kinetic energy while having increased purge gas via the ejection of each shower nozzle; As shown in Figure 5, first the jet of shower nozzle enters the openend 41 of injector, the structure of openend 41 is reversed round bench shapeds, its object is mainly in order the jet of nozzle to be carried out to water conservancy diversion and to limit stream range (if there is angle this situation bigger than normal of jet, just the jet that is ejected into openend can be imported to the inside of injector, prevent impacting peripheral space and cause the waste of blowback air stream energy).Then " jet " and " secondary drainage " together enters the trunnion position 42 of injector, multiple jets due to what adopt, the jet that makes per share high-voltage high-speed all can a certain amount of gas of injection, and therefore the tolerance of " secondary drainage " will be far away higher than existing single injector.Simultaneously, because the energy of multiple jets is than independent jet, it is high that the efficiency that the speed of mixing with secondary jet and energy transmit is wanted, and therefore, the highly shorter diameter of injector employing also larger trunnion also can reach good injection effect.The diffusion chamber 43 that mixed purge gas the enters into injector supercharging of slowing down, the transient energy of purge gas is passed through each chimney filter internal delivery of this unit to the dust layer of outer surface, reach the object of peeling off dust layer, completed the deashing process of pulse backblowing.
As shown in Figure 6,48 chimney filters to be installed as example, when flow angle is 20 °, when winding-up distance is 50mm, the chimney filter of this filter element is covered (ideal situation as shown in Figure 6) by the stream range of 7 shower nozzles on nozzle body, and the regions such as deashing scope are divided to 7.Utilize like this multiply high-speed jet that jet and secondary drainage are mixed, the corresponding regional extent of every one jet, air-flow distribution situation when having improved blowback air and flowing to into injector, reduce divergence loss, improved the energy transfer efficiency of injector, the ash-removal effect reaching is better than existing sub-thread jet nozzle far away.
Owing to adopting the mode of multiple jets, the energy transmission of air-flow is fast, so the length of throat of injector can shorten greatly, same because each shower nozzle all has stronger jet effect, the distance of pulse backblowing can shorten greatly, even if blowback distance during for 0mm (being also very approaching of entrance face of nozzle exit end and injector), still can reach good ash-removal effect.
Equally, jet during due to pulse jet, no longer concentrate on center, but the chimney filter of all directions has all obtained more uniform blowback, so just overcome the impact of the air-flow bias in original technology, reduce the vibration of the chimney filter of this filter element, reduced the risk of thermal shock and fatigue fracture.Another aspect, also just extend the service life of chimney filter, and then ensured the reliable and stable operation of filter operation.
Effect of the present invention increase its credibility and feasibility for better illustrating, now some experimental data is announced.
In the actual high-temperature gas filter of industry, use conventional single hole jet pulse back-blowing device and 7 hole jet pulse back-blowing devices of the present invention, relatively the cleaning efficiency of blowback intensity (criterion is the pressure peak in chimney filter under identical blowback parameter) and filter actual moving process.
Experiment condition is the actual condition of high-temperature gas filter, and technological condition is as follows:
Purge gas is pure nitrogen;
The pulse width of blowback pressure and back-flushing valve is respectively 8.2MPa and 300ms;
Purge gas temperature: 225 ℃;
Filter operation pressure and operating temperature are respectively 4.15MPa and 355 ℃;
Form of nozzle: it is tapering type sub-thread hole jet nozzle that conventional back-blowing device has been installed inner passage; Pulse anti-blow device of the present invention has been installed 7 hole jet nozzles, 1 and 6 of circumference uniform distributions (with consistent in Fig. 4 I) centered by arrangement mode.In 7 small nozzles, a flow angle at center is 0 ° (vertically downward), 6 flow angles of circumference uniform distribution are 20 °, the outlet total sectional area gross area equates (so just to have guaranteed in measuring process with the discharge area of tapering type sub-thread hole jet nozzle, under identical blowback parameter, the air consumption of two kinds of back-blowing devices is substantially consistent).
As shown in Figure 8, Figure 9, be respectively cleaning efficiency and the existing back-blowing device correction data figure of the chimney filter of Pulse anti-blow device of the present invention under pressure peak in the chimney filter of Pulse anti-blow device of the present invention under high temperature actual condition and existing back-blowing device correction data figure and high temperature actual condition.As can be known from Fig. 8: in Pulse Cleaning, while using conventional back-blowing device, the pressure peak in chimney filter is about 5.1MPa, because the mixing of jet and secondary drainage is inhomogeneous, cause having larger pressure oscillation in chimney filter, easily cause the vibration of chimney filter; While using multiple jet back-blowing device of the present invention, the pressure peak in chimney filter is about 7.3MPa, blowback strength increase approximately 30%, and pressure oscillation is less, and visible multiple jet mode has obviously been improved the distribution situation of blowback air-flow.As can be known from Fig. 9: in the running of filter, cleaning efficiency while using conventional back-blowing device is starkly lower than multiple jet back-blowing device of the present invention, and conventional back-blowing device cleaning efficiency has a declining tendency, also verified the deashing non-uniform phenomenon existing in blowback process, if things go on like this, will certainly affect the stable operation of filter.
The foregoing is only the schematic specific embodiment of the present invention, not in order to limit scope of the present invention.Any those skilled in the art, not departing from equivalent variations and the modification done under the prerequisite of design of the present invention and principle, all should belong to the scope of protection of the invention.
Claims (9)
1. a pulse backblowing deashing device for filter, the tube sheet of described filter is provided with filter element, and filter seal is divided into the clean gas chamber on top and the dusty gas chamber of bottom by filter tube sheet; Described pulse backblowing deashing device includes the injector of filter element top setting and the blowback pipeline corresponding with injector, blowback pipeline one end is communicated in blowback air accumulator by pulse backblowing valve, it is characterized in that: the blowback pipeline other end is provided with the tuning formula multiple jet nozzle of setting corresponding to injector top.
2. the pulse backblowing deashing device of filter as claimed in claim 1, is characterized in that: the tube sheet of described filter is provided with many group filter elements; The injector top of every group of filter element respectively correspondence arranges a blowback pipeline.
3. the pulse backblowing deashing device of filter as claimed in claim 1, is characterized in that: described tuning formula multiple jet nozzle is made up of the nozzle body being fixedly connected with the blowback pipeline other end and the multiple shower nozzles that are fixedly installed on nozzle body bottom; Described shower nozzle includes the head body that is fixedly communicated with nozzle body, be connected in clip-on cap in head body and one end fixed clamp other end between head body and clip-on cap passes the jet pipe of clip-on cap.
4. the pulse backblowing deashing device of filter as claimed in claim 3, is characterized in that: between described head body and clip-on cap, form an interior concave spherical grasping part; The spherical clamping part that described jet pipe one end external connects, described spherical clamping part fixed clamp is in described spheric grasping part and form a spherical joint.
5. the pulse backblowing deashing device of filter as claimed in claim 4, is characterized in that: described jet pipe and spherical clamping part are one-body molded.
6. the pulse backblowing deashing device of filter as claimed in claim 3, is characterized in that: described jet pipe inside forms the runner of level and smooth convergent to the port of export.
7. the pulse backblowing deashing device of filter as claimed in claim 3, is characterized in that: described nozzle body comprises the connected chamber with the conducting of the blowback pipeline other end, and connected chamber bottom is connected with shower nozzle by the truncated cone-shaped duct of convergent respectively.
8. the pulse backblowing deashing device of filter as claimed in claim 7, is characterized in that: multiple truncated cone-shaped duct is uniformly distributed around connected chamber bottom.
9. the pulse backblowing deashing device of filter as claimed in claim 8, is characterized in that: in the truncated cone-shaped duct of annular spread, central part is also provided with a truncated cone-shaped duct.
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| CN112370873B (en) * | 2020-10-27 | 2022-06-14 | 西部宝德科技股份有限公司 | High-temperature crude synthesis gas complete set filtering system |
| CN112717570B (en) * | 2020-12-15 | 2023-04-07 | 中建研科技股份有限公司 | Air filter blowback recovery performance detection system and detection method |
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