CN205055650U - High -efficient low resistance filter core of heliciform that ferro -aluminium alloy was made - Google Patents

Abstract

The utility model discloses a high -efficient low resistance filter core of heliciform that ferro -aluminium alloy was made, the filter core that belongs to the dust remover designs the field. This filter core is made by the ferro -aluminium alloy filter material to bend to the heliciform, the filter core body is supported by the metal graticule mesh. The filter core mainly comprises devices such as filter core body, exhaust pipe, pulse blowback aggregate unit, top cap and valves, and the filter core body is cylindric spiral structure, and spiral filter core body aperture is arithmetic progression from inside to outside and reduces. In the actual motion, the flue gas filters the back through the filter core successive layer, most dust by the detention in the filter core outside, the gaseous nexine filter core successive layer that gets into after the purification filters, the bank of tubes income next procedure of discharging fume of final rethread. The utility model provides an in the existing market low, the anti high temperature of dust remover dust collection efficiency, the weak key problem of anti curability.

Description

The helical form efficient low-resistance filter core that a kind of ferroaluminium is made

Technical field

The utility model belongs to the filter core design field of deduster, be specifically related to the preparation of the intermetallic compound porous filtrate of Fe-Al, the change of filtrate maximum diameter of hole and the relation of filter core helicoidal structure and efficiency of dust collection, complete the optimized design scheme of filter element of duster under different application requirements.

Background technology

A large amount of dust and poisonous, pernicious gas is inevitably produced in modern industry production process.The problem such as haze, acid rain grows in intensity in recent years, serious threat human health, therefore alleviates regional atmospheric fine particle and pollutes, and reduces the task of top priority that urban air sulfur dioxide concentration becomes environmental protection.

In recent years, filtering technique has become the dominant technology of gas cleaning.Compared with the cooling, purifying technology of routine, high-temperature flue gas (industrial smokes of more than 220 DEG C) purification techniques has the outstanding advantages such as equipment investment is few, operating efficiency is high, energy consumption is low, environmental protection compatibility is good.Usually the inorganic porous material that this deduster uses comprises metal material and the large class of ceramic material two, wherein ceramic foam filter is owing to having the excellent performance such as high temperature resistant, corrosion-resistant, is thus widely used in the high-temperature flue gas purification equipment of coal-burning boiler, coal gasification power generation system, oil cat-cracker and metal smelt etc.The ability but the intrinsic high fragility of porous ceramics, low heat resistanceheat resistant are shaken, makes it in use cause because of thermal stress damaging, brings huge hidden danger to production.Stainless steel porous material, because of the defect such as mechanical behavior under high temperature is bad and resistance to high temperature oxidation, curing capacity be low, can not be competent at the purification work of high-temperature flue gas.

Intermetallic compound has much special physics, chemistry and mechanical property.Wherein, Fe-Al intermetallic compound porous material is the another novel inorganic porous material after pottery and metal polyporous material, Fe-Al intermetallic compound has the performance of high temperature specific strength and excellent high-temperature oxidation resistant, sulfuration resistant, resist melt salt and impervious carbon, and most highly corrosion resistant temperature can reach 1200 DEG C.In addition, Fe-Al also has excellent anti-catalytic coking, wear-resistant and good processability, meets the requirement for high temperature filter material in modern industry, has the advantages such as can prepare complex-shaped workpieces and pore structure is controlled.Compensate for ceramic porous material intrinsic fragility and not easily assembly and connection and metal polyporous material high-temperature oxidation resistant and corrosion resistance poor, expensive and the deficiencies such as preparation technology's contaminated environment of preparation cost, be a kind of functional material with broad prospect of application, the fields such as isolated by filtration purification, purification, sound insulation, heat insulation and catalysis can be widely used in.Therefore, the novel high-performance Fe-Al alloy porous filter material of Application and Development filtering high-temperature flue gas is of great significance for tool in cleaner.

Through years of researches, people have had further understanding for the structures and characteristics of Fe-Al alloy, obtain to make it and apply widely, just on the basis based on its corrosion resistance excellent, density and low cost and other advantages, the deficiency that its room temperature ductility low and high temperature creep resistance is little must be improved.For this reason, people summarize several principles as follows in alloy designs in recent years: 1) control aluminium content lower than 38%; 2) that form forging or contain fibr tissue elongated grain structure; 3) refining grain size; 4) from the temperature slow cooling of more than 400 DEG C to reduce thermal vacancy; 5) useful alloying element (B, Mn element etc.) is added.

For porous material, pore structure is one of principal element affecting its performance, directly determines through performance and the application of material.Porosity, maximum diameter of hole and air permeability are used to three important parameters of characterizing porous materials hole structural property, and in filtering material field, air permeability and two, maximum diameter of hole hole structural property parameter directly reflect filtration flux and the filtering accuracy of porous body respectively.At present, existing research has described law of regularity between powder size and Reactive Synthesis Fe-Al intermetallic compound porous material hole structural property parameter or quantitative relationship in detail in conjunction with numerical value analysis means, and the performance structure of this pore structure being filtrate controls to provide scientific basis.Research shows, when powder diameter is more than 60 μm, along with the increase of powder diameter, the total porosity of Fe-Al intermetallic compound porous material and the change of perforate porosity are not quite, namely powder size is not the principal element determining Fe-Al porous material porosity, and powder size is the principal element determining Fe-Al intermetallic compound porous material maximum diameter of hole, in the particle size range of 18 ~ 125 μm, porous body maximum diameter of hole d _mwith powder diameter d _pbetween strictly follow d _m=0.4d _pstraight line Changing Pattern.This is also for the complicated aperture structure design of filtrate provides effective foundation.

Fe-Al filter-element dust collector structure is made up of devices such as filter element body, metal graticule mesh and pulse backblowings.Filter core adopts Fe-Al porous filter core, and filter core aperture is then mated according to the granularity of dust in flue gas.The controlled Fe-Al porous filter core in aperture within the specific limits can be prepared by the parameter (as powder mixture ratio, powder size, pressing pressure, finishing etc.) in adjustment Fe-Al filter core preparation process.During deduster work, dusty gas is entered by casing sidepiece, exhaust gas dust is deposited on surface of filter medium by the comprehensive function such as inertial collision, sieving, what granularity was large is collected at outer wall, what granularity was little enters nexine wall successively by large aperture, through comprehensive function layer by layer, the flue gas that granularity reaches discharge standard enters the discharge of central row smoke pipeline.Adopt high-voltage pulse blow-back mode to remove filter element body surface dust when chimney filter resistance reaches setting.Purified gas enters next procedure.

Summary of the invention

The key problem that deduster efficiency of dust collection is in the market low in order to solve, high temperature resistance, sulfuration resistant performance are weak, the utility model provides the helical form high-efficient low-resistance filter core that a kind of ferroaluminium is made, to overcoming the above problems.

In order to overcome the above problems, the utility model is achieved by the following technical programs.

The utility model provides the helical form low-resistance filter core that a kind of ferroaluminium is made, comprise: filter element body, exhaust duct, pulse backblowing linkage and top cover valving, filter element body is supported by metal graticule mesh, it is characterized in that, described filter element body is cylindric sped structure, and this spiral filter element body aperture is arithmetic progression distribution along axis; Described arithmetic progression distribution refers to that aperture is followed successively by d from inside to outside _m1, d _m2, d _m3..., d _mn, and they are with d _mnfor first term, D is the arithmetic progression of tolerance, i.e. d _m1=d _mn+ (n-1) D, wherein: 0.5 μm≤d _m≤ 50 μm, n is the number of turns, and n is the natural number of>=1, d _m1be the maximum diameter of hole of innermost layer filtrate, aperture ecto-entad increases successively, and innermost layer aperture is maximum.

Further, according to the difference of operating mode, arrange different filter core number of turns n, the number of turns controls within 2≤n≤5 are enclosed.

In the utility model: consider that soot has agglomeration, coarsegrain soot is nearly all blocked in outer surface, the very little soot of particle diameter is only had to enter nexine, after successively filtering, small grain size soot enters nexine, for preventing soot generation agglomeration from blocking filter core, so design aperture ecto-entad increases successively, innermost layer aperture is maximum.

In the utility model: filter core bends to helical form by the ferroaluminium of computational length L, by regulating Fe, Al powder proportions, sintering temperature and utilizing multi-steps sintering technique to control the pore size of Fe-Al alloy porous material sintered blank, make aperture d distribution gradient in the scope of 0.5 ~ 50 μm.

In the utility model: Fe, Al powder prepared selected by filtrate all adopts same particle sizes rank, under certain preparation condition, the maximum diameter of hole p of filtrate porous _mwith powder diameter p _pbetween there is following relational expression: p _m=k _pp _p, k in formula _pfor proportionality coefficient, react under this condition powder diameter to the conversion ratio of porous body maximum diameter of hole.

In the utility model: be draw required filter area S according to process air quantity Q and filtration velocity V, by the filter area of single filter cylinder and the size of the required filtrate of equipment situation calculating.Arranging filter cylinder filtrate is highly longitudinally h, can draw filtrate unfolding calculation length L, L=S/h, d ₂=2nd ₁, 2d in formula ₁for the diameter of filter shaft, d ₂for the diameter of outermost layer filtrate, d ₁for the distance of adjacent Internal and external cycle, n is the number of turns, can be drawn specific design size and the structure of filter core filtrate by above-mentioned formula.

Compared with prior art, the utility model has following technique effect:

1, due to the utility model helical form filter core adopt the aperture ecto-entad of filtrate to increase successively, larger soot can stop by outer filtrate, prevents it from entering internal layer, improves its filter effect.Therefore, the utility model dust removing effects is obviously better than the multistage purification dust pelletizing system that existing market uses, and efficiency of dust collection is high, working stability;

2, the utility model adopts Fe-Al candle filter cleaning high-temp flue gas can simplify processes process, reduces equipment investment, operating cost and floor space;

3, the utility model eliminates the link of burning hidden danger minimizing wet filter link water and relevant wastewater treatment that cloth envelop collector causes due to furnace temperature fluctuation; Avoid in the condensation reducing in temperature course the low condensation point material occurred (as condensation), and the pollution caused thus or equipment corrosion; Decrease maintenance cost and extend service life of equipment.

Accompanying drawing explanation

Fig. 1 is the utility model helical form filter core elevation.

Fig. 2 is the A-A cross-section cutaway view in Fig. 1.

Fig. 3 is the B-B cross-section cutaway view in Fig. 1.

In figure: 1, upper top cover; 2, nozzle; 3, flange; 4, pulse valve; 5, control valve; 6, smoke exhaust pipe; 7, nitrogen bag; 8, filter element body; 9, lower top cover; 10, top cover headstock gear; d ₁: box body wall spacing; 2d ₁: innermost layer diameter; d ₂: box body diameter.

Detailed description of the invention

Below in conjunction with accompanying drawing in detail the utility model is described in detail, but the utility model is not limited to following embodiment.

From Fig. 1 ~ Fig. 3, the utility model comprises filter element body 8, exhaust duct 6, pulse backblowing linkage (comprising nozzle 2, flange 3, pulse valve 4, control valve 5, nitrogen bag 7), upper top cover 1, lower top cover 9 and top cover headstock gear 10.Described exhaust duct, top cover material are made up of high temperature resistant, decay resistance material.

During concrete enforcement, aperture is that arithmetic progression distributed aperture is followed successively by d from inside to outside _m1, d _m2, d _m3..., d _mn, and they are with d _mnfor first term, D is the arithmetic progression of tolerance, i.e. d _m1=d _mn+ (n-1) D, wherein: 0.5 μm≤d _m≤ 50 μm, n is the number of turns, and n is the natural number of>=1, d _m1the maximum diameter of hole of innermost layer filtrate, d _mnecto-entad increases successively, and innermost layer aperture is maximum.

The utility model filter element body 8 is made for intermetallic compound ferroaluminium, by regulating Fe, Al powder proportions, sintering temperature and utilizing multi-steps sintering technique to control the pore size of Fe-Al alloy porous material sintered blank, make aperture d distribution gradient in the scope of 0.5 ~ 50 μm.After in actual moving process, flue gas enters casing from cylindrical screw filter core surrounding, because outermost layer aperture is minimum, coarsegrain flue gas is blocked in skin, and the flue gas that granularity is little enters nexine and filters successively, for preventing dust to unite phenomenon, and wall spacing d ₁, tolerance D is unsuitable excessive in the distribution of aperture arithmetic progression gradient.

The utility model is in actual motion, and flue gas is after filter core successively filters, and most of dust is delayed at outside filter core, and purified gas enters nexine filter core and successively filters, and finally enters air by smoke exhaust pipe again.Along with constantly carrying out of filter process, outside filter core, appended long-pending dust constantly increases thus causes the resistance of dust-precipitator itself to increase gradually.When the time that top cover headstock gear 10 is opened reach preset time value time, dust-removing control device sends signal, carries out nitrogen pulse back blow 7 to filter element body.The filtration source of the gas cutting off this room opens electromagnetic pulse 4 and control valve 5, and compressed air expands at a high speed in filter core, when pressure reaches preset value, adds the effect of inverse air-flow, and appended grit distortion outside filter core is come off.Fully examine filter dust be eliminated required time completely, then open the filtration source of the gas of this room and close electromagnetic pulse control valve, in this system, filter core returns to filtration condition again.

Claims (2)

1. the helical form efficient low-resistance filter core made of a ferroaluminium, comprise: filter element body, exhaust duct, pulse backblowing linkage and top cover valving, filter element body is supported by metal graticule mesh, it is characterized in that, described filter element body is cylindric sped structure, and this spiral filter element body aperture is arithmetic progression distribution along axis;

Described arithmetic progression distribution refers to that aperture is followed successively by d from inside to outside _m1, d _m2, d _m3..., d _mn, and they are with d _mnfor first term, D is the arithmetic progression of tolerance, i.e. d _m1=d _mn+ (n-1) D, wherein: 0.5 μm≤d _m≤ 50 μm, n is the number of turns, and n is the natural number of>=1, d _m1the maximum diameter of hole of innermost layer filtrate, d _mnecto-entad increases successively, and innermost layer aperture is maximum.

2. the helical form efficient low-resistance filter core made of ferroaluminium as claimed in claim 1, it is characterized in that, according to the difference of operating mode, arrange different filter core number of turns n, the number of turns controls within 2≤n≤5 are enclosed.