CN106076053A - Separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity - Google Patents

Abstract

The invention discloses a kind of separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity, close coupled cavity (5) to be all of coupled connections with resonance reunion room (7) by adjustable length short tube (8), closing coupled cavity (5) to be connected with electrical modulation sound producing head (3) by exponential type horn (4), electrical modulation sound producing head (3) connects a signal generator and power amplifier (20)；Close coupled cavity (5) and be provided with an air vent (9)；Bending sheet-metal duct (6) it is provided with in resonance reunion room (7).Closing coupled cavity is coupled by length adjustment short tube with resonance reunion room, by regulation stub length, makes the resonant frequency of resonance reunion room equal to the optimum reunion frequency of particulate matter in flue gas.Under acoustic wave action, in bending sheet-metal duct, the granule vibration in flue gas produces relative velocity, mutually collides and is agglomerated into the aggregate of greater particle size and settles or eliminated by conventional dust removal equipment.The present invention takes up room little, and energy consumption is low, simple to operate, has good expansion and efficiency of dust collection is high.

Description

Separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity

Technical field

The present invention relates to the fine grain apparatus and method of removing suspension in a set of flue gas, belong to the pot in pollution control equipment Furnace apparatus dedusting technology field.

Background technology

Especially North China, a lot of city of China in recent years, haze weather occur frequency more come the highest, pollute more come The heaviest, particulate matter has become as each metropolitan major pollutants, is also the important pollutant of room air simultaneously.Suspend thin The discharge of grain thing especially PM2.5 (the aerodynamic diameter thin particle less than 2.5 microns) is in air environmental pollution The main source of particulate matter.Fine grained is generally enriched with harmful substance, and health and environment are easily caused serious harm.

The cleaner major mechanical separator of current industrial normal use, cyclone dust extractor etc., simple in construction, run and It is easily serviced, applies relatively broad, there is higher total efficiency of dust collection, but the particulate removal of micron, submicron order is imitated Rate is the lowest, and sack cleaner is higher to fine grain removal efficiency, but when running, pressure drop is relatively big, and needs back warp often to change filter Material, operating cost is higher.

General acoustic agglomeration method is inefficient to the fine grain reunion that suspends under the relatively low sound intensity and frequency, only has About 40%.General acoustic agglomeration method action time is the 3-8 second, due to more a height of 10 metre per second (m/s)s of typical flue flow velocity with On, cause resonance reunion chamber size can not meet the most greatly industry spot demand.

Existing patent is retrieved, obtains relevant Chinese patent and document is as follows:

1, the patent No.: 02276809.2, three-dimensional granule flow dust remover

2, the patent No.: 03132195.X, rotating fluidized bed blowback gravel bed filter

3, the patent No.: 200510032204, flue type dust removal and purification apparatus

4, the patent No.: 01130066.3, coagulation type electrostatic dust removing method and device

5, the patent No.: 99106814.9, a kind of ultrasonic vibration dust collection method and device

6, the patent No.: 200710132690.6, sound wave and the device of additional seed grain removing grains with combined action thing And method

7, the patent No.: 96105749.1, type of bleeding dust collection method and dust arrester

8, the patent No.: 91102104.6, high efficiency dust remover by magnetization adsorption

In the patent of the above-mentioned relevant particulate removal retrieved, all can not remove efficiently and can suck suspension fine grained, depend on Can determine whether that under high reduction of discharging flow condition, the volume of equipment is bigger according to the principle analysis of wherein acoustic agglomeration relevant apparatus.Wherein the 6th Individual patent is to use the acoustic agglomeration removing fine particle of additional seed grain, easily causes additional seed grain and suspension Fine grained is adsorbed onto pipeline wall, removes more inconvenience, and in device easily causes corrosion, and device, the sound intensity is higher than pole during 160dB In easily causing sound field, turbulent flow occurs, make newly formed aggregate crush, it is difficult to ensure that the work of long time stability.8th specially Profit is for efficiently collecting the particulate matter of weak magnetic, and the granule that removing reconciliation magnetic adherence is collected on the whole still exists the biggest Problem.

The resonance reunion room that Conventional sound reunion dust pelletizing system is generally made up of electroacoustic source driving constant section duct, in resonance The indoor simple standing wave of formation of reunion or row ripple.On the one hand, in commercial Application, resonance cross section, reunion room is very big, in order to reach More satisfactory removal effect, it is desirable to provide the highest acoustical power input so that energy consumption and the operating cost of system are higher, it is difficult to Accepted by actual commercial Application.On the other hand, in the case of flue gas flow is relatively big, constant section duct will take bigger field Space, ground, system is the compactest.

Summary of the invention

The technical problem to be solved is to provide that a kind of energy consumption is low, operating cost is relatively low, compact conformation, take field Ground space little to the suspension fine grained in coal-burning power plant, the smoke evacuation of heating, the tail gas of large-scale diesel engine and other dust-contained airflows Carry out the separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity removed.

In order to solve above-mentioned technical problem, the separate type acoustic agglomeration suspension fine grained based on resonant cavity that the present invention provides subtracts Heat-extraction system, is closed coupled cavity and is all of coupled connections with resonance reunion room by adjustable length short tube, and described closing coupled cavity passes through Exponential type horn is connected with electric-gas modulation sound producing head, and described electric-gas modulation sound producing head connects a signal generator and merit Rate amplifier；Described closing coupled cavity is provided with an air vent；Described resonance reunion indoor are provided with at least one bending Sheet-metal duct.

Close coupled cavity for two to be all of coupled connections with resonance reunion room by adjustable length short tube.

Air compressor is connected with described electric-gas modulation sound producing head by pressurized tank, means for high-pressure gas pipeline.

Two described coupled cavitys of closing all are coupled even with described resonance reunion room by described adjustable length short tube Connect；Air compressor is connected with each described electric-gas modulation sound producing head by pressurized tank, means for high-pressure gas pipeline；Described Bending sheet-metal duct be respectively arranged at two ends with air inlet and gas outlet, it is transaudient that described bending sheet-metal duct is provided with several Device, described microphone communicates to connect with frequency test PC with the sound intensity；Described air inlet is provided with import department's granule density Test device, described gas outlet is provided with exit granule density test device, the described sound intensity and frequency test PC and Described exit granule density test device and granule density display PC communication connection；Described adjustable length short tube and institute The pressurized tank stated all communicates to connect with the controller of pressurized tank flow with the length of adjustable length short tube.

Described gas outlet connects cyclone dust extractor.

Described separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity includes eliminating the strong sound of audibility threshold The noise elimination splitter of ripple.

It is provided with air-introduced machine at described gas outlet.

It is provided with valve at described gas outlet.

Described separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity also includes carrying resonance reunion room Major part there is poroid deadener container and the transfer pipeline of gases at high pressure.

The wall thickness of described bending sheet-metal duct is 2～4.

Using the separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity of technique scheme, its technology is special Point is:

(1) determination of the operating frequency of sound source is excited: electric-gas modulation sound producing head is produced with power amplifier by signal generator The signal that raw 1000Hz to 2000Hz is exaggerated drives, and gases at high pressure is modulated into intensity and is not less than the medium and low frequency sound wave of 150dB；

(2) determination of resonance reunion room resonant frequency: close between coupled cavity and resonance reunion room by adjustable-length Short tube couples, and the length of regulation adjustable length short tube changes the resonance frequency of resonance reunion room (can analogize to last of the twelve Earthly Branches nurse hertz resonant cavity) Rate, the cross-sectional area of quadratic sum adjustable length short tube of this resonant frequency is directly proportional to the ratio of the length of adjustable length short tube. The present invention selects the adjustable length short tube that uiform section is long-pending, by the length i.e. scalable resonance reunion room of regulation adjustable length short tube Resonant frequency.

(3), in ash-laden gas is admitted to the indoor bending sheet-metal duct of resonance reunion, the total length of bending sheet-metal duct is for containing The length difference of cloud of dust gas turnover bending sheet-metal duct, according to the flow of ash-laden gas, determine bending sheet-metal duct sectional area and Total length, and select the bending sheet-metal duct of inner wall smooth as far as possible, ensure that ash-laden gas is low in bending sheet-metal duct simultaneously The time of strong sound wave effect frequently reaches predetermined time requirement (3～10 seconds).

(4) determination of the fine grain removal efficiency that suspends: carry out the measurement of granule density, warp at ash-laden gas air inlet After crossing acoustic agglomeration process, the ash-laden gas after processing is carried out the test of granule density, by both at gas outlet Ratio determines the fine grain removal efficiency of suspension, and decides whether to adjust sound field；

(5) gases at high pressure produced by air compressor, are input to regulate the pressurized tank of high pressure strength flow, then supply Give modulation electric-gas modulation sound producing head, through ovennodulation, gases at high pressure are modulated into low frequency strong sound wave, by exponential type horn to closing Radiative acoustic wave in coupled cavity；Ash-laden gas is input to be built in the bending sheet-metal duct of resonance reunion room through air inlet；Close coupling Close chamber to be coupled by adjustable length short tube with resonance reunion room, by the length of regulation adjustable length short tube to control impact resonance The resonant frequency of reunion room；Produce resonance strong sound wave by excitation resonance reunion room, utilize consequent high-energy-density Sound wave makes the suspension fine grained relative motion in bending sheet-metal duct, can improve the probability that particle mutually collides, and granule touches Being likely to bonding after hitting and form the granule of bigger particle diameter, in the range of the short period, mean particle size can significantly increase, can By gravitational settling or conventional dust removal equipment, the bulky grain in ash-laden gas, aggregate are eliminated.

Present invention introduces in-cavity structure acoustic agglomeration system structure is redesigned, reunite with resonance in sound source Increase between room and close coupled cavity and adjustable length short tube the two acoustic element, coupled cavity, adjustable length short tube will be closed, be total to The series connection of reunion room of shaking forms a kind of resonant frequency adjustable acoustic resonance structure, makes its resonant frequency and particulate matter optimum effect The radiation frequency of frequency and sound source is equal, then, when resonance reunion room reaches resonance state, be internally formed the high sound intensity of ideal frequency Sound field (more than 150dB), final realization is improved reunion emission reduction efficiency and reduces the purpose of energy consumption.In the present invention, air compressor Match with pressurized tank, conveyance conduit, the high-voltage power air-flow of pressure controllable is provided for electric-gas modulation sound producing head；Sound producing head leads to Cross flange to be connected with exponential type horn, and to closing coupling intracavitary irradiation strong sound wave；Close coupled cavity to lead to resonance reunion room Cross adjustable length short tube to be coupled；Ash-laden gas air inlet is connected with the bending sheet-metal duct being built in resonance reunion room；If Dry microphone is respectively placed in bending sheet-metal duct everywhere, lays particle test device respectively, be used for realizing sound field at inlet, outlet Monitoring with particulate matter removing effect；The conventional equipments such as the port of export and the cyclone dust collector of bending sheet-metal duct are connected, general Air-flow after process is discharged.

The present invention, based on strong audio technology, uses strong sound wave to excite and closes the resonant cavity resonance that coupled cavity is connected, it is thus achieved that The sound field that the sound pressure level of frequency-adjustable is higher, relatively stable.High-energy-density sound field is utilized to make to be placed in bending thin-walled in resonant cavity Suspension fine grained vibration in pipeline, relative motion, the volume reducing emission-reducing system is general with what raising particle mutually collided Rate.Being likely to bonding after particles collision and form the granule of bigger particle diameter, in the range of the short period, grain diameter increases aobvious Write, by gravitational settling, or eliminated by conventional dust removal equipment thus reach to control the purpose of PM2.5 discharge.

The present invention is under stablizing adjustable medium and low frequency sound source effect, and resonating in excitation resonance reunion room, generation can penetrate bending The strong sound wave of sheet-metal duct, in removing flue, particle diameter is difficult to micron, the Asia removed less than traditional cleaner of 2.5 μm effectively Micron particle.

The resonant cavity type acoustic agglomeration fine grain theory of suspension of the present invention and the process of calculating are as follows:

(1) determination of resonance reunion room resonant frequency

Close coupled cavity V_aIt is S by cross-sectional area₀, the short tube of a length of l and resonance reunion room V_bCoupling, closes coupling The acoustic impedance of one end, chamber mouth of pipe is:

$Z_0\left(\mathrm{\ω}\right)\≈{\mathrm{i\ρ}}_g{c}_0^2\frac{1-{\mathrm{\ω}}^2{U}_{b}l/S_0{c}_0^2}{{\mathrm{\ωV}}_b}---\left(1\right)$

During seeking the sound absorption power of resonant chamber, as ω=ω_RTime, absorbing energy and reach very big, resonant frequency is full Foot equation

$\mathrm{Im}\[Z_0\left({\mathrm{\ω}}_R\right)-{\mathrm{i\ρ}}_g{\mathrm{\ω}}_R{\stackrel{\‾}{G}}_a\left({\mathrm{\ω}}_R\right)/S_0\]=0---\left(2\right)$

For convenience, if wall is rigidity, approximate solution is obtained

${\mathrm{\ω}}_R^2\≈\frac{S_0{c}_0^2}{V\[l+\mathrm{\ϵ}\left({\mathrm{\ω}}_R^2\right)\]}---\left(3\right)$

WhereinIt is correction term during resonant frequency for stimulating frequency.

(2) the orthokinetic Agglomeration Mechanism frequency kernel function caused by sound wave

Between granule, relative excitation amplitude and phase meter are shown as:

$u_{sij}{e}^{{\mathrm{j\φ}}_{s21}}=u_0\left(x\right)(H_{ij}+G_{ij})---\left(4\right)$

Wherein H_ijFor acoustic wave excitation function, G_ijFor mutual scattering process function

Consider that intergranular scattering process obtains orthokinetic reunion relative velocity and is:

$u_{ij}^{Or}=\frac{2}{\mathrm{\π}}\frac{u_0\mathrm{\ω}|{\mathrm{\τ}}_i-{\mathrm{\τ}}_j|}{\sqrt{(1+{\left({\mathrm{\ω\τ}}_i\right)}^2)(1+{\left({\mathrm{\ω\τ}}_j\right)}^2)}}\sqrt{\frac{(H_{ij}+G_{ij}){(H_{ij}+G_{ij})}^{*}}{H_{ij}{H}_{ij}^{*}}}---\left(5\right)$

Wherein u₀For acoustic velocity amplitude, τ_iFor the relaxation time of granule, ω is angular frequency

When considering to scatter interaction between granule, obtaining orthokinetic interaction condensation nucleus function is:

For polydisperse granule medium, the relative velocity under orthokinetic interaction is just, shows that acoustic wave entrainment is not Ability with the granule of particle diameter is different, creates condition for particle agglomeration.For the present invention contains the suspension fine grained of multiple particle diameter The acoustic agglomeration of medium provides theoretical foundation.

(3) the radiation Agglomeration Mechanism frequency kernel function mutually caused by sound wave

$u_{ij}^{Hyh}=\frac{{\mathrm{\ρ}}_0{u}_0^2{d}_i^2{d}_j^2(1-3{\cos }^2\mathrm{\θ})}{512{\mathrm{\π}}^2{r}^4\mathrm{\μ}}(d_i{g}_{jir}+d_j{g}_{ijr})---\left(7\right)$

Wherein μ is air viscosity coefficient, g_ijrRadiate solidifying mutually for Fluid Dynamic Equations With Radiation action function the most mutual between granule i, j The condensation nucleus function of poly-mechanism:

$K_{ij}^{Hyh}=\frac{\sqrt{3}{\mathrm{\ρ}}_0{u}_0^2{d}_i^2{d}_j^2{(d_i+d_j)}^2}{2304{\mathrm{\π\μr}}^4}(d_i{g}_{jir}+d_j{g}_{ijr})---\left(8\right)$

For monodispersed granule medium, the relative velocity under mutual radiation interaction is just, former incidence wave and scattered wave The adjacent particle that causes of nonlinear effect between interaction make granule be mutually convergent, suspend fine grain reunion for simple grain footpath Create condition.Theoretical foundation is provided for the present invention contains the acoustic agglomeration of monodispersed granule medium.

(4) the reunion kernel function caused by gravitational settling

Owing to non-gaseous particles Media density is far longer than the density of air dielectric, i.e. ρ_P>>ρ_g, obtain gravitational settling relative Speed is:

$u_{ij}^{Gr}\≈\frac{{\mathrm{\ρ}}_{P}g(d_i^2-d_j^2)}{18\mathrm{\μ}}---\left(9\right)$

Wherein g is acceleration of gravity.

The reunion kernel function that gravitational settling causes

$K_{ij}^{Gr}=\frac{{\mathrm{\π\ρ}}_{P}g{(d_i+d_j)}^2(d_i^2-d_j^2)}{72\mathrm{\μ}}---\left(10\right)$

For the suspension fine grained medium of same density, exist different between the granule that granule that particle diameter is bigger is less from particle diameter Sedimentation velocity, and produce relative velocity, gravitational settling is also one of foundation of particle agglomeration.Gravitational settling is reunited simultaneously is also nothing Reunion foundation main during acoustic wave action.

Therefore total reunion kernel function can be expressed as:

$K_{ij}=K_{ij}^{Or}+K_{ji}^{Hyh}+K_{ij}^{Gr}---\left(11\right)$

Radiation orthokinetic, mutual, gravitational settling reunion kernel function are independent of each other, therefore total reunion kernel function is that three is linear Superposition sum.Total reunion kernel function can support the present invention in theory.

The invention has the beneficial effects as follows: add under the exciting of strong sound wave outside, resonating in resonance reunion room, resonant frequency can Adjusting to reach to meet the agglomerating effect of optimum, in conjunction with follow-up conventional dust removal device, removing has containing of complicated particle diameter distribution effectively Suspension fine grained in cloud of dust gas.Under identical acoustical power initial conditions, the sound intensity of resonance state resonance reunion indoor is the highest, Owing to agglomeration increases with the sound intensity, forming frequency is equal to the strong sound field of optimum acting frequency therein.Result makes altogether Cavate acoustic agglomeration system of shaking not only has more preferable emission reduction effect, and has relatively low energy consumption.Sound field and particulate matter characteristic prison Survey the introducing of subsystem and the regulon system such as the sound intensity, frequency and feedback control procedure make emission-reducing system possess certain from Adaptability, it is possible to be applicable to broader polluter object and situation that discharged particle dynamically changes.Meanwhile, base is used Separate type structure in in-cavity can make the high-voltage power air-flow of driving electric-gas modulation sound producing head not enter resonance reunion room, Realize being effectively isolated of power air-flow and flue gas, it is to avoid the impact on flue gas characteristic of the power air-flow, it is to avoid resonance is reunited indoor rapid The appearance of stream is in order to avoid the aggregate generated crushes.By test, assembly of the invention can make the suspension fine grained in ash-laden gas Removal efficiency reaches more than 70%-80%, and the removal efficiency of mass concentration reaches more than 80%.It is limited and have that native system is applicable to place Extensive ash-laden gas purifies the occasion needed.

In sum, it is right that the present invention is that a kind of energy consumption is low, operating cost is relatively low, compact conformation, occupied ground space are little Suspension fine grained in coal-burning power plant, the smoke evacuation of heating, the tail gas of large-scale diesel engine and other dust-contained airflows carries out the base removed Separate type acoustic agglomeration suspension fine grained emission-reducing system in resonant cavity.

Accompanying drawing explanation

Fig. 1 is the structural representation of the present invention.

Fig. 2 is that the structure of the present invention improves schematic diagram.

Fig. 3 is the concrete schematic diagram of the present invention.

Fig. 4 is the overall application structural representation of the present invention.

In figure: 1-air compressor 1,2-pressurized tank 2,3-electric-gas modulation sound producing head 3,4-exponential type horn 4,5-close Coupled cavity 5,6-bending sheet-metal duct 6,7-resonance reunion room 7,8-adjustable length short tube 8,9-air vent 9,10-ash-laden gas enter QI KOU 10,11-import department granule density test device 11,12-microphone 12,13-granule density display PC 13,14-length The length of adjustable short tube and the controller 14 of pressurized tank flow, the 15-sound intensity and frequency test PC 15, the conveying of 16-gases at high pressure Pipeline 16,17-exit granule density test device 17,18-gas outlet 18,19-cyclone dust extractor 19,20-signal generator With power amplifier 20.

Detailed description of the invention

The invention will be further described with embodiment below in conjunction with the accompanying drawings.

See Fig. 1, close coupled cavity 5 for one and be all of coupled connections with resonance reunion room 7 by adjustable length short tube 8, close Coupled cavity 5 is connected with electric-gas modulation sound producing head 3 by exponential type horn 4, and electric-gas modulation sound producing head 3 connects has a signal to send out Raw device and power amplifier 20；Close coupled cavity 5 and be provided with a less air vent of bore 9；Resonance is provided with one in reunion room 7 Individual bending sheet-metal duct 6.The wall thickness of bending sheet-metal duct 6 is 2～4mm.

See Fig. 2, close coupled cavity 5 for one and be all of coupled connections with resonance reunion room 7 by adjustable length short tube 8, close Coupled cavity 5 is connected with electric-gas modulation sound producing head 3 by exponential type horn 4；It is less that closing coupled cavity 5 is provided with a bore Air vent 9；At least one bending sheet-metal duct 6 it is provided with in resonance reunion room 7.The wall thickness of bending sheet-metal duct 6 is 4.

See Fig. 3, close coupled cavity 5 and be all of coupled connections with resonance reunion room 7 by adjustable length short tube 8.Close coupling Chamber 5 is connected with electric-gas modulation sound producing head 3 by exponential type horn 4, and electric-gas modulation sound producing head 3 is respectively connected with a signal and occurs Device and power amplifier 20.Close coupled cavity 5 and be provided with a less air vent of bore 9, with gas in guarantee closing coupled cavity 5 Pressure balanced.At least one bending sheet-metal duct 6 it is provided with in resonance reunion room 7.

Seeing Fig. 4, the whole system of the present invention is divided into sound source, closes coupled chamber, ash-laden gas flow pipe, system survey Electricity testing device, feedback control platform.

Concrete connected mode is as follows: closes coupled cavity 5 for two and is all coupled with resonance reunion room 7 by adjustable length short tube 8 Connect.Each closing coupled cavity 5 is connected with electric-gas modulation sound producing head 3 by exponential type horn 4, each electric-gas modulation sound producing head 3 are respectively connected with a signal generator and power amplifier 20.Each closing coupled cavity 5 is provided with a less aerofluxus of bore Mouth 9, to ensure to close coupled cavity 5 internal gas pressure balance.Air compressor 1 passes through pressurized tank 2, means for high-pressure gas pipeline 16 with every Individual electric-gas modulation sound producing head 3 is connected, and each seam sealing shroud is closed and prevented pressure-air from leaking；Resonance is provided with in reunion room 7 At least one bends sheet-metal duct 6, and bend sheet-metal duct 6 is respectively arranged at two ends with air inlet 10 and gas outlet 18.Gas outlet 18 Connect and have cyclone dust extractor 19.Bending sheet-metal duct 6 is provided with several microphones 12, microphone 12 and the sound intensity and frequency test PC 15 communicates to connect.Air inlet 10 is provided with import department's granule density test device 11, and gas outlet 18 is provided with exit Grain concentration determination device 17, the sound intensity shows with granule density with frequency test PC 15 and exit granule density test device 17 PC 13 communicates to connect.Adjustable length short tube 8 and pressurized tank 2 all with the control of the length of adjustable length short tube with pressurized tank flow Device 14 communicates to connect.The wall thickness of bending sheet-metal duct 6 is 2～4.

Air compressor 1 is connected with electric-gas modulation sound producing head 3 by pressurized tank 2, means for high-pressure gas pipeline 16, electric-gas Modulation sound producing head 3 forms sound system by exponential type horn 4 to closing coupled cavity 5 radiative acoustic wave.By closing coupled cavity 5, end End air vent 9 and adjustable-length short tube 8 are constituted closes coupled chamber, and closing coupled cavity 5 utilizes adjustable length with resonance reunion room 7 Short tube 8 coupling composition resonant cavity.The dust-laden being made up of air inlet 10, bending sheet-metal duct 6, gas outlet 18 and cyclone dust extractor 19 Flue gas flow pipe.Tested device 11 by import department's granule density, exit granule density tests device 17 and it is thin to be placed in bending Some microphones 12 in wall pipeline 6 form opening machine system test device.By granule density display PC 13, the sound intensity and frequency test PC Machine 15, the length of adjustable length short tube form feedback control platform with controller 14 3 part of pressurized tank flow.

After adjustable length short tube 8 in closing coupled cavity 5 determines, calculate the resonant frequency of resonance reunion room 7, pass through Gases at high pressure are modulated into low frequency strong sound wave by electric-gas modulation sound producing head 3, and utilization index model cylinder 4 is spoke in closing coupled cavity 5 Penetrating, resonates in excitation resonance reunion room 7.

Further, the present invention includes the noise elimination splitter that can eliminate audibility threshold strong sound wave.Air-introduced machine is added at gas outlet 18. Valve is added to force the increasing action time at gas outlet 18.May also include having of the major parts such as carrying resonance reunion room 7 Poroid deadener container and the transfer pipeline of gases at high pressure.

Seeing Fig. 4, closing coupled cavity 5, adjustable length short tube 8, the series connection of resonance reunion room 7 form a kind of in-cavity knot Structure, the resonant frequency of in-cavity is changed by the regulation of the length of adjustable length short tube 8, electric-gas modulation sound producing head 3 by with Its exponential type horn 4 connected to closing radiative acoustic wave in coupled cavity 5, make electric-gas modulation the sent frequency of sound wave of sound producing head 3 with The resonant frequency of particulate matter the best use of frequency and in-cavity is equal, then sound wave is through adjustable length short tube 8 excitation resonance group Poly-room 7 reaches resonance state, is internally formed the strong sound field of characteristic frequency in resonance reunion room 7.At identical acoustical power input bar Under part, the sound intensity in resonance state resonance reunion room 7 is the highest, owing to agglomeration increases with the sound intensity, and resonant cavity type acoustic agglomeration System has more preferable emission reduction effect and relatively low energy consumption.Meanwhile, in-cavity structure is used can to make the modulation pronunciation of driving electric-gas The power air-flow of 3 does not enter resonance reunion room 7, it is achieved power air-flow is effectively isolated with flue gas, it is to avoid resonate in reunion room 7 The appearance of turbulent flow is in order to avoid the aggregate generated crushes.

The gases at high pressure that air compressor 1 produces enter pressurized tank 2, high pressure merit before entering electric-gas modulation sound producing head 3 The pressure adjustable of rate air-flow, and then regulation electric-gas modulation sound producing head 3 produces the intensity of sound wave.Electric-gas modulation sound producing head 3 produces The frequency of sound wave can be regulated with power amplifier 20 by signal generator.By change close coupled cavity 5 and resonance reunion room 7 it Between adjustable length short tube 8 length adjustment resonance reunion room 7 resonant frequency, make it be equal to the frequency of produced sound wave.Logical Cross import department's granule density test device 11 and exit granule density tests the particulate matter characteristic that device 17 is measured in flue gas, defeated Enter acoustic agglomeration suspension fine grained Theoretical Calculation and obtain optimum sound wave frequency and intensity.By aforementioned regulation process, make in system The sound intensity and frequency are equal to optimum.Measured by import department's granule density test device 11 and exit granule density test device 17 Agglomerating effect, if being unsatisfactory for requiring, repeats " measuring-calculate-regulation " process.Realize at particulate matter eventually through feedback control Emission reduction effect optimum under the conditions of characteristic variations.

Ash-laden gas enters in the bending sheet-metal duct 6 being placed in resonance reunion room 7, when electric-gas modulates sound producing head 3 and refers to When the sound wave that number model cylinder 4 produces makes resonance reunion room 7 reach resonance state by closing coupled cavity 5 and adjustable length short tube 8, In resonance reunion room 7, strong sound wave is entered in bending sheet-metal duct 6 by wall, to the particulate matter applying effect in flue gas, makes not With relative motion between sized particles thing and collide with each other and be agglomerated into the aggregate of greater particle size, and then at downstream sedimentation or quilt Conventional dust removal equipment eliminates.

Connecting in-cavity structure respectively in resonance both sides, reunion room 7, the electric-gas modulation sound producing head 3 of both sides passes through respectively Connected exponential type horn 4 is to closing radiative acoustic wave in coupled cavity 5, and the adjustable length short tube 8 through both sides excites simultaneously Resonance reunion room 7 reaches resonance state.Under conditions of in resonance reunion room 7, the sound intensity is certain, make by the way of combination of stimulation The intensity obtaining single electric-gas modulation sound producing head 3 declines, it is contemplated that electric-gas modulation sound producing head 3 has higher under relatively low-intensity Conversion efficiency, combination of stimulation reduce further the energy consumption of whole system.

Seeing Fig. 4, the carrying out practically process of native system is as follows:

1, air compressor 1 is loaded the gases at high pressure of generation by adjustable pressurized tank 2 and gases at high pressure conveying pipe Road 16 inputs electric-gas modulation sound producing head 3, and signal generator and power amplifier 20 provide to electric-gas modulation sound producing head 3 and be exaggerated The signal of telecommunication；Gases at high pressure are modulated into low frequency strong sound wave by electric-gas modulation sound producing head 3；

2 with the electric-gas modulation exponential type horn 4 that matches of sound producing head 3 as sound radiator, to greatest extent by electricity- The strong sound wave of controlled atmosphere sound producing head 3 output radiates in closing coupled cavity 5；

3, ash-laden gas is admitted to bend in sheet-metal duct 6, makes flue gas in resonance reunion room 7 by bending sheet-metal duct 6 Interior action time reaches predetermined time requirement 3～10s；

4, the length of the adjustable length short tube 8 being connected with resonance reunion room 7 by regulation controls the resonance of resonance reunion room 7 Frequency；

5, the gases at high pressure produced by air compressor 1 are through the regulation of pressurized tank 2, make gases at high pressure adjustable, it is achieved sound The most adjustable；

6, measure resonance reunite by import department's granule density test device 11 and exit granule density test device 17 Agglomerating effect in room 7, and regulate action time, or (4) step regulation resonant frequency by (3) step, or (5) step is adjusted Joint input pressure, to regulate the sound intensity, makes agglomerating effect reach optimum；

7, the ash-laden gas through resonance reunion room 7 is by gravitational settling or other conventional dust removal device such as cyclone dust removal Device 19, eliminates the bulky grain in ash-laden gas, aggregate.

Utilize the present invention can obtain good effect.The side that coupled cavity 5 couples is closed with resonance reunion room 7 owing to using Method, the resonant frequency of regulation resonance reunion room 7, relatively high sound intensity (more than 150dB) can be obtained, thin particle relative motion can be made Acutely, mutually collision and the probability that bonds increases substantially, tradition cleaner unit phase specific energy consumption is little with using, and efficiency is high, and expense is low.Adopt Big with the action intensity of resonant cavity type acoustic agglomeration, there is not obvious turbulent phenomenon.System simple to operate can continuous action straight Fine grained major part to ash-laden gas is reunited.Although in resonance reunion room 7, the sound intensity is up to more than 150dB, but acoustic agglomeration system System periphery can be laid with the noise elimination splitter eliminating audible sound frequency range strong sound wave, or uses the major parts such as carrying resonance reunion room 7 There is the container of poroid deadener, can substantially reduce strong sound wave to the interference of human body and infringement.

Claims (10)

1. a separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity, is characterized in that: close coupled cavity (5) equal Being of coupled connections with resonance reunion room (7) by adjustable length short tube (8), described closing coupled cavity (5) passes through exponential type horn (4) being connected with electric-gas modulation sound producing head (3), described electric-gas modulation sound producing head (3) connects a signal generator and merit Rate amplifier (20)；Described closing coupled cavity (5) is provided with an air vent (9)；It is provided with in described resonance reunion room (7) At least one bending sheet-metal duct (6).

Separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity the most according to claim 1, is characterized in that: Two described closing coupled cavitys (5) are all of coupled connections with resonance reunion room (7) by adjustable length short tube (8).

Separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity the most according to claim 1 and 2, its feature It is: air compressor (1) is by pressurized tank (2), means for high-pressure gas pipeline (16) and described electric-gas modulation sound producing head (3) It is connected.

Separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity the most according to claim 1, is characterized in that: Two described closing coupled cavitys (5) are all by described adjustable length short tube (8) and described resonance reunion room (7) company of coupling Connect；Air compressor (1) is by pressurized tank (2), means for high-pressure gas pipeline (16) and each described electric-gas modulation sound producing head (3) it is connected；Described bending sheet-metal duct (6) be respectively arranged at two ends with air inlet (10) and gas outlet (18), described bending Sheet-metal duct (6) is provided with several microphones (12), and described microphone (12) leads to frequency test PC (15) with the sound intensity Letter connects；Described air inlet (10) is provided with import department's granule density test device (11), and described gas outlet (18) sets Having exit granule density test device (17), the described sound intensity is dense with frequency test PC (15) and described exit granule Degree test device (17) and granule density display PC (13) communication connection；Described adjustable length short tube (8) and described pressure Power tank (2) all communicates to connect with the controller (14) of pressurized tank flow with the length of adjustable length short tube.

Separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity the most according to claim 4, is characterized in that: Described gas outlet (18) connects cyclone dust extractor (19).

6. according to the separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity described in claim 4 or 5, its feature It is: described separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity includes eliminating disappearing of audibility threshold strong sound wave Sound splitter.

7. according to the separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity described in claim 4 or 5, its feature It is: described gas outlet (18) place is provided with air-introduced machine.

8. according to the separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity described in claim 4 or 5, its feature It is: described gas outlet (18) place is provided with valve.

9. according to the separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity described in claim 4 or 5, its feature It is: described separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity also includes carrying resonance reunion room (7) etc. Major part there is poroid deadener container and the transfer pipeline of gases at high pressure.

Separate type acoustic agglomeration suspension fine grained emission-reducing system based on resonant cavity the most according to claim 1 and 2, it is special Levy and be: the wall thickness of described bending sheet-metal duct (6) is 2～4.