CN103550991B - A kind of mining centrifugal dust removing fan and Optimization Design thereof - Google Patents

Abstract

The invention discloses a kind of mining centrifugal dust removing fan and Optimization Design thereof. Mining centrifugal dust removing fan of the present invention comprises fan section, centrifugal de-dirt section and dewatering period, and dust-laden is distinguished and admirable to be entered from fan section, distinguished and admirable from dewatering period out by becoming cleaning after de-dirt dehydration; Described fan section comprises blower fan; Described centrifugal de-dirt section comprises the outrigger shaft that is installed in centrifugal de-dirt section barrel and connects with blower fan main shaft by shaft coupling, and helical blade is installed on outrigger shaft, in the centrifugal de-dirt section barrel under helical blade, is provided with tank; Described dewatering period comprises dewatering plate. The present invention utilizes equilibrium orbit theory, carry out the stressed analysis with speed of Coal Dust in the centrifugal de-dirt section of mining centrifugal dust removing fan, solve emphatically combination between structural parameters and the operational factor impact on efficiency of seizing dust, the structure of mining centrifugal dust removing fan is optimized to design. After optimizing, can improve efficiency of dust collection, reduce resistance, reduce energy consumption.

Description

A kind of mining centrifugal dust removing fan and Optimization Design thereof

Technical field

The invention belongs to down-hole dedusting technology field, be specifically related to a kind of mining centrifugal dust removing fan andOptimization Design.

Background technology

Down-hole getting working face control dirt problem is one of difficult problem in industry, is related to underground operatorsPhysical and mental health is the hot issue of discussing and studying always. At home, current China's coal-mine down-hole is usedDeduster mostly is the deduster of the eighties in 20th century from external introduction or independent development; These deduster processingAir quantity is all less than normal (generally at 180m³/ min is following), be not suitable with the needs that colliery high strength is exploited; SeparatelyOutward, these dedusters or efficiency of dust collection low (80% left and right), costs and poor dehydration results (lower than 85%), orWorking resistance large (being greater than 2200Pa) is difficult to reach efficiency of dust collection high (more than 99%), dewatering efficiency comprehensivelyThe requirement of high (more than 95%) and working resistance low (lower than 1500Pa). Abroad, dust removing down-hole deviceTaking the deduster that filters the mechanism such as depositing dust, static depositing dust as main, although efficiency is high, exist resistance excessive,Often, up to more than 2300Pa, floor space is large, and roadway bulk is needed greatly, is difficult to meet ChinaThe actual needs of coal mine underground exploitation. Especially, the settings such as driving face, are that downhole powder dust pollutesFor serious place, be also air distribution amount large need wind point; Mining partial dedusting fan can be realized air feed simultaneouslyAnd dedusting, be the ventilating dust-arrester that is applicable to China's coal-mine subsurface environment.

Summary of the invention

One of object of the present invention is utilizing dedusting basic theories, in conjunction with China's quo of local Fan for MineDesign feature, provides a kind of mining centrifugal dust removing fan.

Above-mentioned purpose of the present invention realizes by the following technical solutions: this is mining centrifugal dust-removing windMachine, it comprises fan section, centrifugal de-dirt section and dewatering period, dust-laden is distinguished and admirable to be entered from fan section, by de-dirtAfter dehydration, become cleaning distinguished and admirable from dewatering period out; Described fan section comprises blower fan; Described centrifugal de-dirt section bagDraw together and be installed in centrifugal de-dirt section barrel and the outrigger shaft connecting with blower fan main shaft by shaft coupling, on outrigger shaftHelical blade is installed, in the centrifugal de-dirt section barrel under helical blade, is provided with tank; Described dewatering period bagDraw together dewatering plate.

The dust-cleaning principle of the mining centrifugal dust removing fan of the present invention is that, in centrifugal de-dirt section, helical blade is fixedOn outrigger shaft, helical blade and fan blade synchronous rotary, the helical flow path of formation loop cycle, makes gasStream rotation, Coal Dust is subject to the effect of centrifugal force to centrifugal de-dirt section barrel motion, to the coal of barrel motionDirt particle, is subject to being wrapped in the resistance of motion effect of its ambient air, i.e. air drag. Coal Dust is subject toCentrifugal force and air drag, under the effect of centrifugal force, Coal Dust is constantly to the motion of barrel direction, and it is subject toThe air drag arriving is also in continuous increase, and air drag levels off to centrifugal force gradually, when air drag equalsWhen centrifugal force, the two dynamic equilibrium, Coal Dust place tracks, is Coal Dust balance trackRoad, the method using equilibrium orbit as particle force analysis, is referred to as equilibrium orbit theory, a large amount of researchPractice shows that this theory is applicable to the force analysis of depositing dust and large particle diameter respirable dust. Utilize balance track reasonOpinion, carries out the stressed analysis with speed of Coal Dust in the centrifugal de-dirt section of mining centrifugal dust removing fan, separates emphaticallyThe certainly impact of the combination between structural parameters and operational factor on efficiency of seizing dust, to mining centrifugal dust removing fanStructure is optimized design.

Two of object of the present invention is to provide a kind of optimal design based on above-mentioned mining centrifugal dust removing fanMethod, the method comprises:

Calculating centrifugal de-dirt section by formula (24) is d to grain diameter_pThe classification efficiency of Coal DustDetermine the relation between each variable in formula (24), by the method for numerical simulation, determine miningThe structural parameters of centrifugal dust removing fan, meet requirement of engineering, are the centrifugal force utilizing in blower fan, slough and containCoal Dust during dirt is distinguished and admirable, realizes air decontamination;

${\mathrm{\η}}_{d_p}\≤1-e^{-\frac{{\mathrm{\π}}^3}{135}\·\frac{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)\·(R_1^2-R_2^2)}{\mathrm{\μ}}\·\frac{L}{Q}\·n^2\·d_p^2}---\left(24\right)$

In formula (24), d_pThe diameter for Coal Dust, the m of unit;Centrifugal de-dirt section is to coal dustThe classification efficiency of grain, dimensionless number; R₁Centrifugal de-dirt section barrel radius, R₂Helical blade radius, singlePosition m; ρ_pCoal Dust density, ρ_aThe density of fluid, units/kg/m³; μ is fluid dynamic viscosityCoefficient, the Pas of unit; π is pi, dimensionless number; L is the axial length of centrifugal de-dirt section, unitM; Q is ventilation blower volume flow, the m of unit³/ min; N is ventilation blower rotating speed, the r/min of unit.

Specifically, engineering restriction and the China booster to centrifugal de-dirt section size according to sceneTechnical parameter, establish ρ_p=1.4×10³kg/m³，L=1m，n=2900r/min，μ=1.428×10^-4Pa·s，In substitution formula (24), obtain formula (25):

${\mathrm{\η}}_{d_p}\≤1-e^{-6.0275\·{10}^{12}.\frac{(R_1^2-R_2^2)\·d_p^2}{Q}}---\left(25\right)$

In formula (25), compriseR₁、R₂、d_pWith these 5 variablees of Q, by numerical simulationMethod, find out the correlation between these 5 variablees, determine the structural parameters of mining centrifugal dust removing fan,Meet requirement of engineering.

More particularly, said method comprises the steps:

(1) according to actual demands of engineering, calculate required airflow, determine dust-removing blower for mine air quantity, selectBlower fan plane No.;

(2) according to dust-removing blower for mine plane No., determine the centrifugal de-dirt section barrel radius of centrifugal de-dirt section,Be R₁Numerical value;

(3) according to the fan performance parameter of determining, determine air quantity scope, i.e. the numerical value of Q; Select severalIndividual air quantity operating point, substitution formula (25), simplifies this formula;

(4), according to boundary constraint, obviously helical blade radius can not be greater than centrifugal de-dirt section barrel radius,I.e. 0≤R₂≤R₁; Wherein, R₂=0 represents spiral dedusting blade is not set, and R₂=R₁Represent helical bladeRadius equals centrifugal de-dirt section barrel radius, forms helical duct, and formula (25) can not carry out efficiency of dust collectionAnd the analysis of dedusting fan structure parameter optimizing; Therefore, R₂Assignment scope be 0.01≤R₂≤0.29；

(5) giveAssignment, successively assignment be 10%, 20%, 30%, 40%, 50%, 60%, 70%,80% and 90%;

(6) assignmentSubstitution formula (25), further simplifies this formula, utilizes numerical valueEmulation tool, and then analyzeR₂、d_p, draw because becoming graph of a relation, optimize R₂It is helical blade radius.

Mining centrifugal dust removing fan and the Optimization Design thereof of the present invention's energy, can optimize centrifugal dust removing fan dressThe parameter of putting, improves efficiency of dust collection, reduces resistance, reduces energy consumption.

Brief description of the drawings

Fig. 1 is the structural representation of the mining centrifugal dust removing fan of the embodiment of the present invention, and wherein, A is dust-laden windStream, B is fan section, and D is centrifugal de-dirt section, and E is dewatering period, and F is clean distinguished and admirable.

Fig. 2 is the separation process schematic diagram of particle swarm in centrifugal de-dirt section in Fig. 1, and wherein, a, b, c are equalRepresent Coal Dust.

Fig. 3 is centrifugal de-dirt segment structure parameter and Coal Dust force analysis schematic diagram in Fig. 1, wherein, and R₁Centrifugal de-dirt section barrel radius, R₂Helical blade radius, R₀Extending shaft radius, R_xIt is Coal DustSeparate critical radius, R is Coal Dust position radius of curvature, and H is helical blade radial height, CThe centrifugal force of Coal Dust, the air drag of S Coal Dust.

Fig. 4 is the graph of relation (air quantity of Coal Dust classification efficiency and helical blade radius280m³/min）。

Fig. 5 is the graph of relation (air quantity of Coal Dust classification efficiency and helical blade radius320m³/min）。

Fig. 6 is the graph of relation (air quantity of Coal Dust classification efficiency and helical blade radius360m³/min）。

Fig. 7 is the graph of relation (air quantity of Coal Dust classification efficiency and helical blade radius400m³/min）。

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention is described in further detail.

Referring to Fig. 1, the mining centrifugal dust removing fan of the embodiment of the present invention comprises fan section B, centrifugal de-dirt sectionD and dewatering period E, the distinguished and admirable A of dust-laden enters from the left end of fan section B, by becoming cleaning after de-dirt dehydrationDistinguished and admirable F from the right-hand member of dewatering period E out; As can be seen from Fig. 1, fan section B comprises blower fan 1; Centrifugal de-Dirt section D comprises and is installed on the extension connecting with blower fan main shaft in centrifugal de-dirt section barrel 6 and by shaft coupling 2Axle 3, is provided with helical blade 4 on outrigger shaft 3, in the centrifugal de-dirt section barrel 6 under helical blade 4Be provided with tank 5; Dewatering period E comprises dewatering plate 7.

Referring to Fig. 2, Fig. 3, the present invention is based on the tool of the Optimization Design of above-mentioned mining centrifugal dust removing fanBody step and reckoning process are as follows:

Motion Coal Dust in this mining centrifugal dust removing fan, is subject to the shadow of the helical blade of High Rotation SpeedRing, be subject to the effect of centrifugal force, produce centrifuge speeds, meanwhile, the particle in motion is also subject to airResistance, has following formula:

$C=m\·u_a^2\·R^{-1}---\left(1\right)$

$S=0.5\·\mathrm{\ξ}\·F\·{\mathrm{\ρ}}_p\·{\mathrm{\ω}}_p^2---\left(2\right)$

In formula (1) and formula (2), C is the centrifugal force of particle, the N of unit; S is the sky of Coal DustAtmidometer, the N of unit;Coal Dust relative mass, units/kg; u_aBeFlow rotation line of motion speed, the m/s of unit; R is Coal Dust position radius of curvature, the m of unit; ξCoal Dust resistance coefficient, the Pas of unit;Coal Dust projected area, unitm²；ρ_pCoal Dust density, units/kg/m³；ρ_aThe density of fluid, units/kg/m³；d_pIt is coalThe diameter of dirt particle, m; ω_pThe tangential velocity of Coal Dust with respect to fluid, the m/s of unit.

According to equilibrium orbit theory, when the separating rate of particle reaches a fixing value in some momentsTime, have the suffered centrifugal force of particle to equal gas to the air drag of particle in motion, by formula (1) andFormula (2), has:

${\mathrm{\ω}}_p=\sqrt{\frac{4}{3}\·\frac{d}{R}\·\frac{1}{\mathrm{\ξ}}\·\frac{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)}{{\mathrm{\ρ}}_d}}\·u---\left(3\right)$

According to centrifugal force settlement law, the more little more difficult sedimentation of particle, if d_pThe particle of > 5 μ m can pass throughThe method of centrifugation is removed, and the particle that particle diameter is larger can be removed more, as calculated movement of particles thunderPromise number is less than 1. Therefore, the settlement law of particle is mainly subject to Stokes' law domination,

$\mathrm{\ξ}=\frac{24\·\mathrm{\μ}}{{\mathrm{\ω}}_p\·d_p\·{\mathrm{\ρ}}_p}---\left(4\right)$

In (4) formula, μ is fluid dynamic viscosity, the Pas of unit.

(4) are brought into formula (3), can obtain the centrifuge speeds in centrifugal force field of spherical rigid particles:

${\mathrm{\ω}}_p=\frac{1}{18}\·\frac{d_p^2\·({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)}{R}\·\frac{u_a^2}{\mathrm{\μ}}---\left(5\right)$

, there is following relation in the air-flow linear velocity that rotatablely moves in centrifugal de-dirt section:

$u_a=\frac{\mathrm{\π}\·R\·n}{30}---\left(6\right)$

In formula (6), π is pi, dimensionless number; R is Coal Dust position radius of curvature,The m of unit; N is rotating speed, the r/min of unit.

Wushu (6) is brought in formula (5):

${\mathrm{\ω}}_p=\frac{{\mathrm{\π}}^2}{16200}\·\frac{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)}{\mathrm{\μ}}\·n^2\·d_p^2\·R---\left(7\right)$

Equal particle institute through approach time differential, that is: according to the instantaneous centrifuge speeds of particle

${\mathrm{\ω}}_p=\frac{\mathrm{dR}}{\mathrm{dt}}---\left(8\right)$

Wushu (7) substitution formula (8), to obtain final product:

$\mathrm{dt}=\frac{16200}{{\mathrm{\π}}^2}\·\frac{\mathrm{\μ}}{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)}\·\frac{1}{n^2}\·\frac{1}{d_p^2}\·\frac{\mathrm{dR}}{R}---\left(9\right)$

Above formula (9) is carried out to integration, and left end dt is by 0 to τ integration, and the right dR is by R_x(particle separation is facedBoundary's radius) to R₁(centrifugal de-dirt section barrel radius) integration, particle relies on centrifugation to move to barrelOn the wall of limit, the relational expression of its required time and displacement is:

${\∫}_0^{\mathrm{\τ}}\mathrm{dt}=\frac{16200}{{\mathrm{\π}}^2}\·\frac{\mathrm{\μ}}{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)}\·\frac{1}{n^2}\·\frac{1}{d_p^2}\·{\∫}_{R_x}^{R_1}\frac{\mathrm{dR}}{R}---\left(10\right)$

From formula (10), movement of particles has different sinking speed during to different radius of curvature, withThe increase of radius of curvature, particle sinking speed increases gradually, and Particle Acceleration is deposited to barrel inner surface.Particle is from initial critical buckling position R_xBe deposited to barrel inner surface R₁Time, the time variation of experiencing is0 → τ (being that Granula Subsidence Time is τ), that is:

$\mathrm{\τ}=\frac{16200}{{\mathrm{\π}}^2}\·\frac{\mathrm{\μ}}{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)}\·\frac{1}{n^2}\·\frac{1}{d_p^2}\·1n\frac{R_1}{R_x}---\left(11\right)$

By dedusting general principle, in homogeneous centrifugal field, be the relaxation time of particle,

${\mathrm{\τ}}_0=\frac{{\mathrm{\ρ}}_p\·d_p^2}{18\mathrm{\μ}}---\left(12\right)$

Comparison expression (10) and formula (11), can find out grit required relaxation time, and being far smaller than grit needsThe sedimentation time of wanting, can be similar to and think, the motion of Coal Dust in centrifugal de-dirt section, can be similar toDo not consider the consuming time of initial acceleration.

Known particle is discharged along with the distinguished and admirable entrance by centrifugal de-dirt section enters into outlet, the shortest is consuming timely:

$t_0=\frac{L}{u_0}---\left(13\right)$

In formula (13), t₀The average duration that air flow stream is crossed segregation section, the s of unit; L is centrifugal de-dirt sectionAxial length, the m of unit; u₀The average axial flow velocity of air-flow in centrifugal de-dirt section, the m/s of unit.

By de-dirt principle, be separated if realize Coal Dust,,

τ≤t₀（14）

By formula (11), formula (13) and formula (14), to obtain final product:

$\frac{16200}{{\mathrm{\π}}^2}\·\frac{\mathrm{\μ}}{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)}\·\frac{1}{n^2}\·\frac{1}{d_p^2}\·1n\frac{R_1}{R_x}\≤\frac{L}{u_0}---\left(15\right)$

Transform (15), to obtain final product:

$R_x\≥R_1{e}^{-\frac{{\mathrm{\π}}^2}{16200}\·\frac{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)}{\mathrm{\μ}}\·\frac{L}{u_0}\·n^2\·d_p^2}---\left(16\right)$

In centrifugal de-dirt section, air-flow axial velocity is larger, and critical de-dirt radius is larger; Otherwise, criticalRadius is less. Critical radius is larger, means that particle is centrifuged the possibility of separation lower. Therefore, if itsHis condition is constant, the particle that maximum axial speed can be separated, and in the situation that being less than this speed, this particleAlso one be separated surely. Air-flow maximum axial flow velocity, can approximate representation be,

$u_0=\frac{Q}{60\·\mathrm{\π}\·(R_1^2-R_2^2)}---\left(17\right)$

In formula (17), Q is ventilation blower volume flow, the m of unit³/min。

Wushu (17) substitution formula (16), to obtain final product:

$R_x\≥R_1{e}^{-\frac{{\mathrm{\π}}^3}{270}\·\frac{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)\·(R_1^2-R_2^2)}{\mathrm{\μ}}\·\frac{L}{Q}\·n^2\·d_p^2}---\left(18\right)$

When grain diameter is d_p, be greater than particles settling in the radius of curvature R at centrifugal de-dirt section entrance face placeCritical buckling radius R_xTime, particle can be deposited to the cylindrical shell wall of dedusting section; Otherwise, when particle is centrifugalThe radius of curvature R at de-dirt section entrance face place is less than the critical buckling radius R of particles settling_xTime, particle is with gasStream flows out rotational flow dust-removing section.

The division of Yu Fei decanting zone, the endocorpuscular decanting zone of centrifugal de-dirt section is the critical buckling with particles settlingRadius R_xFor boundary. It is R that radius of curvature is closed_x≥R≥R₁Time, this annular region is particles settling district. ByIn the critical buckling half that is less than particles settling when particle in the radius of curvature R at centrifugal de-dirt section entrance face placeFootpath R_xTime, particle can flow out rotational flow dust-removing section with air-flow; It is R that radius of curvature is closed₂≥R>R_xTime, this annularRegion is the non-settling zone of particle; It is 0 >=R that radius of curvature is closed > R₂Time, this annular region is also that particle is non-Settling zone; Therefore, 0 >=R > R_xTime, this annular region is the non-decanting zone of particle. Therefore, centrifugal de-dirtSection He Fei decanting zone, decanting zone volume is:

${\mathrm{dV}}_1=\mathrm{\π}\·(R_1^2-R_x^2)\·\mathrm{dx}---\left(19\right)$

${\mathrm{dV}}_2=\mathrm{\π}\·R_x^2\·\mathrm{dx}---\left(20\right)$

In formula (19) and formula (20), dV₁Particles settling district, the m of unit³；dV₂That particle is non-Decanting zone, the m of unit³; Dx is centrifugal de-dirt section axial length micro component, the m of unit.

Centrifugal de-dirt section is d to grain diameter_pClassification efficiency, can be expressed as,

${\mathrm{\η}}_{d_p}=\frac{{\mathrm{dV}}_1}{{\mathrm{dV}}_1+{\mathrm{dV}}_2}---\left(21\right)$

Formula (19) and formula (20) are brought into formula (21), to obtain final product:

${\mathrm{\η}}_{d_p}=1-\frac{R_x^2}{R_1^2}---\left(22\right)$

Formula (18) substitution formula (22), to obtain final product:

${\mathrm{\η}}_{d_p}\≤1-e^{-\frac{{\mathrm{\π}}^3}{135}\·\frac{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)\·(R_1^2-R_2^2)}{\mathrm{\μ}}.\frac{L}{Q}\·n^2\·d_p^2}---\left(23\right)$

In formula (23), compriseR₁、R₂、d_pWith 10 variablees such as Q, and π, 135Deng 4 constants, determine the relation between these 10 variablees, be to utilize quo of local Fan for Mine interior centrifugalPower, sloughs Coal Dust in dirty general mood stream, realizes air decontamination, can referred to as in quo of local Fan for Mine fromThe heart takes off dirt implementation method.

From the foregoing, because atmospheric density is little a lot of with respect to Coal Dust density, formula (23) can letterTurn to:

${\mathrm{\η}}_{d_p}\≤1-e^{-\frac{{\mathrm{\π}}^3}{135}\·\frac{{\mathrm{\ρ}}_p\·(R_1^2-R_2^2)}{\mathrm{\μ}}\·\frac{L}{Q}\·n^2\·d_p^2}---\left(24\right)$

Engineering restriction according to scene to centrifugal de-dirt section size and the technical parameter of domestic booster, canIf ρ_p=1.4×10³kg/m³，L=1m，n=2900r/min，μ=1.428×10^-4Pas, substitution formula (24),:

${\mathrm{\η}}_{d_p}\≤1-e^{-6.0275\·{10}^{12}\·\frac{(R_1^2-R_2^2)\·d_p^2}{Q}}---\left(25\right)$

In formula (25), compriseR₁、R₂、d_pWith these 5 variablees of Q, can pass through numerical valueThe means of emulation, find out the correlation between these 5 variablees, determine mining centrifugal de-dirt dedusting fan dressThe structural parameters of putting, meet requirement of engineering. Concrete steps are as follows:

(1) according to actual demands of engineering, calculate required airflow, determine dust-removing blower for mine air quantity, selectBlower fan plane No..

(2) according to dust-removing blower for mine plane No., determine the barrel radius of centrifugal de-dirt section, that is, and R₁NumberValue.

(3) according to the fan performance parameter of determining, determine air quantity scope, that is, and Q; Select several windAmount operating point, substitution formula (25), simplifies this formula.

(4), according to boundary constraint, obviously helical blade radius can not be greater than centrifugal de-dirt section barrel radius,I.e. 0≤R₂≤R₁; Wherein, R₂=0, represent spiral dedusting blade is not set, and R₂=R₁, represent spiralBlade radius equals barrel radius, forms helical duct, and formula (25) can not carry out efficiency of dust collection and dedustingThe analysis that apparatus structure is optimized; Therefore, R₂Assignment scope be 0.01≤R₂≤0.29。

(5) giveAssignment, successively assignment be 10%, 20%, 30%, 40%, 50%, 60%, 70%,80% and 90%.

(6), assignment, substitution formula (25), further simplifies this formula, utilizes numerical simulationInstrument, and then analyzeR₂、d_pBetween because of change relation, draw because of become graph of a relation, optimize R₂。

Case history below:

Taking mining FBD № 6.0 as example, design centrifugal dust removing fan, its cylinder inboard wall radius is 0.300m,Institute's gas-distributing motor is 2 × 15kW, air quantity scope 256m³/min～469m³/ min, blast is 4601Pa～1363Pa, rated speed 2900r/min.

(1) FBD № 6.0 blower fans, R₁=0.300m。

Substitution formula (25):

${\mathrm{\η}}_{d_p}\≤1-e^{-6.0275\·{10}^{12}\·\frac{({0.3}^2-R_2^2)\·d_p^2}{Q}}---\left(26\right)$

(2) be to successively Q assignment, 280,320,360,400; Domination formula (26).

(3) and then, give successivelyAssignment is, 10%, 20%, 30%, 40%, 50%, 60%, 70%,80%，90%。

(4) utilize numerical simulation instrument, analyze R₂And d_pBecause of change relation, draw graph of relation, asShown in Fig. 4 to Fig. 8.

Relation between table 1 helical blade radius and grain diameter

Remarks: in table 1, Coal Dust particle diameter, unit is um.

According in " Integrated Technology of Dust Suppression in Comprehensive specification under coal mine " AQ1020-2006 regulation, respiratory coalDirt, i.e. d_p≤ 10um, controlling dirt rate should be lower than 70%. Therefore, utilize the data of Fig. 4 to Fig. 7,Taking efficiency of dust collection as 70%, grain diameter is 10um, and air quantity is 280m³/ min to 400m³/ min, wholeReason data, as shown in table 1. As can be seen from Table 1, meet respirable coal dust particle minimum 70%Dust removing rate, as long as helical blade radius is not less than 0.197m.

If will further improve the dust removing rate to respirable coal dust, can strengthen the radius of helical blade; SameHelical blade radius is not identical to the dust removing rate of different coal dust particles; And different operation air quantityTime, the spiral shell blade radius of revolving that meets AQ1020-2006 regulation is also different; Around aforementioned 5 parameters,About the problem in mining centrifugal dust removing fan design, can also list more. Mining centrifugal dust-removing aboveProblem in blower fan optimal design, all can be by the detailed description of the invention providing in the present invention, and utilizes numerical valueSimulation means obtains related data, the problem of the structural parameters in solution optimal design and operational factor combination.Mining centrifugal dust removing fan and Optimization Design thereof proposed by the invention, also can be applicable to various models fromThe optimal design of heart dedusting fan device.

In case history of the present invention, for FBD № 6.0 blower fans, at cylindrical shell radius 0.300m, in fortuneSector-style amount is 280m³/ min to 400m³In the scope of/min, helical blade radius is 0.197m, forParticle diameter is the Coal Dust of 10um, and efficiency of dust collection can reach 70%; The coal dust that is 7.6um for particle diameterGrain, efficiency of dust collection can reach 50%, and cut diameter is 7.6um. The dedusting wind of optimal design in case historyMachine, efficiency of dust collection meets the technical stipulation of AQ1020-2006, by optimizing helical blade radius, can alsoFurther improve efficiency of dust collection.

Claims (3)

1. an Optimization Design for mining centrifugal dust removing fan, described mining centrifugal dust removing fan comprisesFan section, centrifugal de-dirt section and dewatering period, dust-laden is distinguished and admirable to be entered from fan section, by becoming after de-dirt dehydrationCleaning is distinguished and admirable from dewatering period out; Described fan section comprises blower fan; Described centrifugal de-dirt section comprise be installed on fromThe heart takes off in dirt section barrel and the outrigger shaft connecting with blower fan main shaft by shaft coupling, and spiral is installed on outrigger shaftBlade, is provided with tank in the centrifugal de-dirt section barrel under helical blade; Described dewatering period comprises dewatering plate;It is characterized in that comprising: calculating centrifugal de-dirt section by formula (24) is d to grain diameter_pCoal DustClassification efficiencyDetermine the relation between each variable in formula (24), by the method for numerical simulation,The structural parameters of determining mining centrifugal dust removing fan, meet requirement of engineering; Be the centrifugal force utilizing in blower fan,Slough the Coal Dust of dust-laden in distinguished and admirable, realize air decontamination;

${\mathrm{\η}}_{d_p}\≤1-e^{-\frac{{\mathrm{\π}}^3}{135}\·\frac{({\mathrm{\ρ}}_p-{\mathrm{\ρ}}_a)\·(R_1^2-R_2^2)}{\mathrm{\μ}}\·\frac{L}{Q}\·n^2\·d_p^2}---\left(24\right)$

In formula (24), d_pThe diameter of Coal Dust, the m of unit;Centrifugal de-dirt section to Coal DustClassification efficiency, dimensionless number; R₁Centrifugal de-dirt section barrel radius, R₂Helical blade radius, the m of unit;ρ_pCoal Dust density, ρ_aThe density of fluid, units/kg/m³; μ is fluid dynamic viscosity,The Pas of unit; π is pi, dimensionless number; L is the axial length of centrifugal de-dirt section, the m of unit; Q isVentilation blower volume flow, the m of unit³/ min; N is ventilation blower rotating speed, the r/min of unit.

2. the Optimization Design of mining centrifugal dust removing fan according to claim 1, is characterized in that:If ρ_p＝1.4×10³kg/m³，L＝1m，n＝2900r/min，μ＝1.428×10^-4Pas, substitution formula (24),Obtain formula (25):

${\mathrm{\η}}_{d_p}\≤1-e^{-6.0275\·{10}^{12}\·\frac{(R_1^2-R_2^2)\·d_p^2}{Q}}---\left(25\right)$

In formula (25), compriseR₁、R₂、d_pWith these 5 variablees of Q, by numerical simulationMethod, find out the correlation between these 5 variablees, determine the structural parameters of mining centrifugal dust removing fan,Meet requirement of engineering.

3. the Optimization Design of mining centrifugal dust removing fan according to claim 2, is characterized in thatComprise the steps:

(1) according to actual demands of engineering, calculate required airflow, determine dust-removing blower for mine air quantity, selectBlower fan plane No.;

(2) according to dust-removing blower for mine plane No., determine the centrifugal de-dirt section barrel radius of centrifugal de-dirt section,Be R₁Numerical value;

(3) according to the fan performance parameter of determining, determine air quantity scope, i.e. the numerical value of Q; Select severalIndividual air quantity operating point, substitution formula (25);

(4) according to boundary constraint, R₂Assignment scope be 0.01≤R₂≤0.29；

(5) giveAssignment, successively assignment be 10%, 20%, 30%, 40%, 50%, 60%, 70%,80% and 90%;

(6) assignmentSubstitution formula (25), further simplifies, and utilizes numerical simulation workTool, and then analyzeR₂、d_pBetween because of change relation, draw because of become graph of a relation, optimize R₂It is spiralBlade radius.