CN113672003B - Zone control sound wave soot blower and control method - Google Patents
Zone control sound wave soot blower and control method Download PDFInfo
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- CN113672003B CN113672003B CN202110969643.7A CN202110969643A CN113672003B CN 113672003 B CN113672003 B CN 113672003B CN 202110969643 A CN202110969643 A CN 202110969643A CN 113672003 B CN113672003 B CN 113672003B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D19/00—Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase
- G05D19/02—Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase characterised by the use of electric means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/74—Cleaning the electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
- B08B7/026—Using sound waves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/24—Details of magnetic or electrostatic separation for measuring or calculating of parameters, e.g. efficiency
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Abstract
The invention provides a zone control sound wave soot blower and a control method thereof, comprising a sound wave generator, a sound wave transmission horn and a sound wave zone control system; the sound transmission drums are uniformly distributed at the inlet of the dust removal chamber, and each sound transmission drum is connected with a sound generator; a dust removing area and a dust raising prevention area are arranged in the dust removing chamber, a plurality of electric fields are arranged in the dust removing chamber, and at least one first sensor is arranged in the dust removing area in each electric field; at least one second sensor is arranged in a dust emission prevention area in each electric field; the sound wave area control system controls the frequency, the intensity and the phase of each sound wave generator according to the detection value of the first sensor, the detection value of the second sensor and the position of the sound wave sound transmission horn. The invention adopts the frequency-adjustable sound wave soot blower and the area control method, which can ensure that the ammonium bisulfate is effectively removed and the secondary dust raising is avoided.
Description
Technical Field
The invention relates to the field of environmental protection dust removal or the field of dust removal in a dust removal chamber, in particular to a zone control sound wave soot blower and a control method.
Background
In the whole ultralow emission of thermal power transformation technology, the high-efficient clean operation of electrostatic precipitator equipment plays crucial effect, and its dust collection efficiency directly influences the effect of process equipment such as low reaches flue gas desulfurization, superfine particulate matter processing, but in service at present, electrostatic precipitator deposition scale deposit is serious, and current mode of shaking can't be solved, leads to low reaches equipment burden to increase weight, and the effect is not good, and particulate matter etc. exceed standard and discharge, and the leading cause has following several aspects:
(1) in order to ensure the denitration efficiency, ammonia is excessively sprayed during operation of the upstream denitration equipment of the electrostatic dust collector, so that ammonia escapes, ammonia bisulfate is attached to an anode plate/cathode line of the electrostatic dust collector to form scale, the dust removal efficiency is reduced, and the energy consumption is increased.
(2) The electrostatic precipitator adopts a mechanical vibration mode to remove dust, but the mode can only solve common dust scale, has no effect on the scaling of ammonium bisulfate, and is difficult to ensure the clean and efficient operation of equipment.
(3) The existing mechanical rapping type dust removing mode easily causes fatigue damage of equipment, generates secondary dust raising, causes escape of smoke and dust particles and reduces dust collecting efficiency.
Aiming at the problems of the electrostatic dust collector, some enterprises try to adopt a sound wave soot blowing technology to obtain certain results, but due to the characteristics of the electrostatic dust collector equipment, particularly the control of secondary dust raising, the problems can not be solved well no matter the sound wave soot blower of a resonance type, a rotary whistle and the like is adopted.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a zone control sound wave soot blower and a control method thereof, and the frequency-adjustable sound wave soot blower and the zone control method are adopted, so that the ammonium bisulfate can be effectively removed, and secondary dust raising is avoided.
The present invention achieves the above-described object by the following technical means.
A region control sound wave soot blower comprises a sound wave generator, a sound wave transmission horn and a sound wave region control system; the sound transmission drums are uniformly distributed at the inlet of the dust removal chamber, and each sound transmission drum is connected with a sound generator; the dust removing room is internally provided with a dust removing area and a dust raising prevention area, the dust removing room is internally provided with a plurality of electric fields, and the dust removing area in each electric field is at least provided with a first sensor for detecting the sound wave intensity in the dust removing area in the electric field; at least one second sensor is arranged in the dust emission prevention area in each electric field and used for detecting the intensity of sound waves in the dust emission prevention area in the electric field;
the sound wave area control system is used for enabling the sound wave phase reaching each dust removing area to be the same and enabling the sound wave phase reaching each dust preventing area to be opposite by controlling the frequency, the intensity and the initial phase of each sound wave generator according to the detection value of the first sensor, the detection value of the second sensor and the position of the sound wave sound transmission horn.
Further, with the electric field of clean room export intercommunication is for avoiding the raise dust region, and the region in the ash bucket top 2m is for avoiding the raise dust region in the residual electric field, and all the other regions are the dusting region in the residual electric field.
A control method for a zone control sound wave soot blower comprises the following steps:
n electric fields are arranged in the dust removal chamber, J sound wave sound transmission horns are arranged at the inlet of the dust removal chamber, the Nth electric field is a dust raising prevention area, and areas 2m above the dust hopper in the 1 st electric field, the 2 nd electric field …, the ith electric field and the … N-1 th electric field are dust raising prevention areas respectively; the rest areas of the No. 1 electric field, the No. 2 electric field … and the No. i electric field …, the No. N-1 electric field are ash removing areas respectively;
determining the distance L from the jth acoustic wave microphone to the first sensor in the ith electric field dust removing areaj,iDetermining that the distance from the jth acoustic microphone to the ith electric field avoids the second sensor in the dust region to be L'j,i；
The sound wave area control system calculates the average value of the difference between the distance from the jth sound wave microphone to the first sensor in the ith electric field dust removing area and the distance from the (j + 1) th sound wave microphone to the first sensor in the ith electric field dust removing area,
the sonic zone control system calculates
The sound wave area control system calculates the distance between the jth sound wave transmission sound horn and a second sensor in the ith electric field dust-avoiding area and the distance between the jth +1 sound wave transmission sound horn and the ith electric field dust-avoiding areaThe average value of the difference in the distance between the two sensors,
the sonic zone control system calculates
J sound wave microphone emitting same frequency f and P0The sound wave of sound pressure, the jth sound wave transmitting sound horn sends out the sound source:
wherein
The initial phase of the sound source sent out for the jth sound wave microphone;
after J sound sources are superposed:
the sound wave area control system determines initial sound wave frequency according to the condition that the delta L is integral multiple of the wavelength and the delta L' is odd multiple of the half wavelength, and adjusts the frequency f and the initial phase of the sound source through feedback
The sound waves in the dust removing area are superposed, and the sound waves in the dust raising area are avoided offsetting.
Further, the sound wave area control system determines the initial sound wave frequency according to the condition that the delta L is integral multiple of the wavelength and the delta L' is odd multiple of the half wavelength, and adjusts the frequency f and the initial phase of the sound source through feedback
The method specifically comprises the following steps:
calculating the frequency of the Δ L corresponding to the integral multiple of the wavelength: f. of1＝(nλ)×c/ΔL，
Calculating the frequency corresponding to the half-wavelength odd multiple of the DeltaL': f. of2(2n-1/2) λ xc/Δ L', wherein: λ isA wavelength m; c is the sound velocity m/s; n is a wavelength multiple;
if f1-f2When | ═ 0, then
The sound wave area control system 3 controls the J sound wave transmitting horns 1 to sound in the same initial phase;
if min | f is present1-f2If l, then take f1minF, the acoustic zone control system 3 satisfies
Determining initial phase under condition, controlling J sound transmission horns 1 to sound according to different initial phases, enhancing the intensity of J sound sources,
the electrostatic dust collector is internally provided with a plurality of dust chambers, and each dust chamber is provided with the area control sound wave soot blower.
The invention has the beneficial effects that:
1. according to the area control sound wave soot blower, a dust removing chamber is divided into a dust removing area and a dust flying prevention area according to an area control principle, the sound energy ratio of the dust removing area to the dust flying prevention area is maximized as an optimization target, the sound waves reaching the dust removing area are same in initial phase by controlling the frequency, the intensity and the initial phase of a sound wave generator, the sound waves are superposed and enhanced, the dust flying prevention areas are opposite in initial phase, the sound waves are superposed and weakened, and finally the sound wave intensities of different areas meet the working soot blowing requirements.
2. According to the area control sound wave soot blower, according to the working characteristics of the dust removal chamber, the electric field communicated with the outlet of the dust removal chamber is an area for avoiding dust flying, the area 2m above the ash bucket in the residual electric field is an area for avoiding dust flying, and the rest areas in the residual electric field are areas for removing dust, so that the division can ensure that the dust removal efficiency reaches 99.7%, and simultaneously can inhibit dust flying.
3. The invention discloses a control method of a zone control sound wave soot blower, which comprises the following steps:
(1) based on the interference principle, a control method that different sound fields in different areas are not interfered with each other is adopted, and a control target is obtained by fewer sound sources.
(2) In theory, the influence of the sound source installation position on the regional sound field control target is large, and by adopting the control method, the requirement on the sound source installation position in practical application can be reduced.
(3) And the contrast of sound energy in a bright and dark area is used as a control target, so that the influence of uncertain disturbance on a control effect is reduced, and the robustness of a control system is enhanced.
Drawings
Fig. 1 is a schematic diagram of a zone control sound wave soot blower according to the present invention.
Fig. 2 is a schematic view of the dust removing area and the dust emission preventing area in the electric field according to the present invention.
Fig. 3 is a schematic diagram of the distance from the jth acoustic horn to the first and second sensors in the ith electric field in accordance with the present invention.
In the figure:
1-a sonic horn; 2-a sound wave generator; 3-a sonic zone control system; 4-a gas source system; 5-a dust removal chamber; 6-ash removal area; 7-avoiding dust raising areas; 8-a first sensor; 9-second sensor.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the area control sound wave soot blower of the present invention comprises a sound wave generator 2, a sound wave transmitting sound horn 1 and a sound wave area control system 3; the sound transmission drums 1 are uniformly arranged at the inlet of a dust removing chamber 5, and each sound transmission drum 1 is connected with a sound generator 2; generally, at least 2 sound-transmitting horns 1 are uniformly distributed at the inlet of a dust-removing chamber 5, each sound-transmitting horn 1 is connected with a sound generator 2, the sound generator 2 is a magnetic frequency modulation high-sound intensity sound generator, the magnetic frequency modulation technology is adopted, the sound power is more than 30Kw, the frequency modulation range is 10 Hz-20 KHz, and the harmonic component is less than 1%.
Be equipped with dust removal region 6 in the clean room 5 and avoid raise dust region 7, with the electric field of 5 exports intercommunication in clean room is for avoiding raise dust region 7, and the region in the ash bucket top 2m in the residual electric field is for avoiding raise dust region 7, and all the other regions are dust removal region 6 in the residual electric field, as shown in fig. 2. A plurality of electric fields are arranged in the dust removing chamber 5, and at least one first sensor 8 is arranged in the dust removing area 6 in each electric field and used for detecting the sound wave intensity in the dust removing area 6 in the electric field; at least one second sensor 9 is arranged in the dust emission prevention area 7 in each electric field and used for detecting the intensity of sound waves in the dust emission prevention area 7 in the electric field; the sound wave area control system 3 is used for controlling the frequency, the intensity and the initial phase of each sound wave generator 2 according to the detection value of the first sensor 8, the detection value of the second sensor 9 and the position of the sound wave microphone 1, so that the initial phases of the sound waves reaching each dust removing area 6 are the same and the initial phases of the sound waves reaching each dust raising avoiding area 7 are opposite.
A control method for a zone control sound wave soot blower comprises the following steps:
the dust chamber 5 is divided into a dust-raising avoiding area 7 and a dust-removing area 6: n electric fields are arranged in the dust removing chamber 5, J sound wave transmission horns 1 are arranged at the inlet of the dust removing chamber 5, the Nth electric field is a dust raising prevention area 7, and areas 2m above the dust hopper in the 1 st electric field, the 2 nd electric field …, the ith electric field and the … Nth-1 th electric field are dust raising prevention areas 7 respectively; the rest areas of the No. 1 electric field, the No. 2 electric field … and the No. i electric field …, the No. N-1 electric field are ash removing areas 6 respectively; at least one first sensor 8 is arranged in the dust removing area 6 in each electric field and used for detecting the intensity of sound waves in the dust removing area 6 in the electric field; at least one second sensor 9 is arranged in the dust emission prevention area 7 in each electric field and used for detecting the intensity of sound waves in the dust emission prevention area 7 in the electric field;
determining the distance L from the jth acoustic wave horn 1 to the first sensor 8 in the ith electric field dust removing area 6j,iDetermining the distance L 'from the second sensor 9 in the jth acoustic horn 1 to the ith electric field emission avoidance dust region 7'j,i；
The sound wave area control system 3 calculates the distance from the jth sound wave transmitting sound horn 1 to the first sensor 8 in the ith electric field dust removing area 6 and the jth +1 sound wave transmitting soundThe average of the differences in distance of the first sensors 8 in the acoustic horn 1 to the ith electric field ash removal region 6,
the acoustic wave region control system 3 calculates Δ LiAverage value of (2)
The acoustic region control system 3 calculates an average value of differences between distances from the jth acoustic horn 1 to the second sensor 9 in the ith electric field dust-free region 7 and distances from the j +1 th acoustic horn 1 to the second sensor 9 in the ith electric field dust-free region 7,
the acoustic wave region control system 3 calculates Δ LiAverage value of `
J sound transmission horns 1 emit the same frequency f and P0The sound wave of sound pressure, the jth sound wave transmitting horn 1 sends out the sound source as follows:
wherein
The initial phase of the sound source sent out for the jth sound wave microphone 1;
after J sound sources are superposed:
when in use
When in use
Take the maximum value J2J sound waves are mutually superposed;
when in use
Namely, it is
Taking the minimum value of 0, J sound waves are mutually counteracted.
The sound wave area control system 3 determines the initial sound wave frequency according to the condition that the wave length is integral multiple of the wave length and the wave length is odd multiple of the half wave length, and adjusts the frequency f and the initial phase of the sound source through feedback
Make the interior sound wave of dust removal region 6 superpose and make and avoid the regional 7 sound waves of raise dust to offset, specifically do:
calculating the frequency of the Δ L corresponding to the integral multiple of the wavelength: f. of1＝nλ×c/ΔL，
Calculating the frequency corresponding to the half-wavelength odd multiple of the DeltaL': f. of2(2n-1/2) λ xc/Δ L', wherein: λ is the wavelength m; c is the sound velocity m/s; n is a wavelength multiple;
the frequency f of the sound wave is theoretically f1-f2The frequency of absolute value approaching 0, | f1-f2| ═ 0. In the actual calculation process, the frequency corresponding to the small value is controlled, the tolerance is controlled to be below 10Hz, and if a plurality of frequencies exist, the minimum value, namely f is takenmin。
If f1-f2When | ═ 0, the acoustic wave region control system 3 satisfies
Controlling J sound wave microphone 1 to sound at the same initial phase;
if f1-f2If | ≠ 0, there is min | f1-f2If l, then take f1minF, the acoustic zone control system 3 satisfies
The initial phase of the condition controls the J sound transmission horns 1 to sound according to different initial phases, simultaneously enhances the intensity of J sound sources,
example 1:
as shown in fig. 1, in a 1000MW ultra-supercritical coal-fired unit, 5 electric fields are provided in each dust chamber of an electrostatic precipitator, and 3 sound wave transmitting microphones 1 are uniformly distributed at 5 inlets of the dust chamber, that is, N is 5, and J is 3. Each sound wave transmitting sound horn 1 is connected with a sound wave generator 2, the sound power of the sound wave generator 2 is 40Kw, and the sound wave frequency adjusting range is 10-20 KHz.
The dust chamber 5 is divided into a dust-raising avoiding area 7 and a dust-removing area 6: the 5 th electric field is a dust emission prevention area 7, and areas 2m above the dust hopper in the 1 st electric field, the 2 nd electric field …, the ith electric field and the … th electric field are the dust emission prevention areas 7 respectively; the rest areas of the 1 st electric field, the 2 nd electric field … and the ith electric field … and the 4 th electric field are ash removing areas 6 respectively; namely, a total of 5 dust-free areas 7 and 4 dust-removing areas 6 are arranged in a dust chamber with 5 electric fields. Each ash removing area 6 is provided with a first sensor 8 for detecting the intensity of sound waves in the ash removing area 6 in the electric field; a second sensor 9 is arranged in each dust emission prevention area 7 and used for detecting the intensity of sound waves in the dust emission prevention area 7 in the electric field;
determining the distance L from the 1 st acoustic microphone 1 to the first sensor 8 in the 1 st electric field dust removing area 61,1(ii) a Determining the distance L from the 1 st acoustic microphone 1 to the first sensor 8 in the 2 nd electric field dust removing area 61,2(ii) a Determining the distance L from the 1 st acoustic microphone 1 to the first sensor 8 in the ith electric field dust removing area 61,iI ∈ (1,2,3, 4); determining a distance L 'from the 1 st acoustic horn 1 to the second sensor 9 in the 1 st electric field dust emission avoidance region 7'1,1(ii) a Determining a distance L 'from the second sensor 9 in the 1 st acoustic horn 1 to the 2 nd electric field dust emission avoidance region 7'1,2(ii) a Determining the distance from the 1 st acoustic horn 1 to the second sensor 9 in the i-th electric field dust-free region 7Is L'1,i，i∈(1,2,3,4,5)；
Determining the distance L from the 2 nd acoustic microphone 1 to the first sensor 8 in the 1 st electric field dust removing area 62,1(ii) a Determining the distance L from the 2 nd acoustic microphone 1 to the first sensor 8 in the 2 nd electric field dust removing area 62,2(ii) a Determining the distance L from the 2 nd acoustic microphone 1 to the first sensor 8 in the ith electric field dust removing area 62,iI ∈ (1,2,3, 4); determining a distance L 'from the 2 nd acoustic horn 1 to the second sensor 9 in the 1 st electric field dust emission avoidance region 7'2,1(ii) a Determining a distance L 'from the second sensor 9 in the 2 nd acoustic horn 1 to the 2 nd electric field dust emission avoidance region 7'2,2(ii) a Determining a distance L 'from the second sensor 9 in the 2 nd acoustic horn 1 to the ith electric field dust emission avoidance region 7'2,i，i∈(1,2,3,4,5)；
Determining the distance L from the 3 rd acoustic microphone 1 to the first sensor 8 in the 1 st electric field dust removing area 63,1(ii) a Determining the distance L from the 3 rd acoustic microphone 1 to the first sensor 8 in the 2 nd electric field dust removing area 63,2(ii) a Determining the distance L from the 3 rd acoustic microphone 1 to the first sensor 8 in the ith electric field dust removing area 63,iI ∈ (1,2,3, 4); determining a distance L 'from the second sensor 9 in the 3 rd acoustic horn 1 to the 1 st electric field dust emission avoidance region 7'3,1(ii) a Determining a distance L 'from the second sensor 9 in the 3 rd acoustic horn 1 to the 2 nd electric field dust emission avoidance region 7'3,2(ii) a Determining a distance L 'from the second sensor 9 in the 3 rd acoustic horn 1 to the ith electric field dust emission avoidance region 7'3,i，i∈(1,2,3,4,5)；
The acoustic area control system 3 calculates the average value of the difference between the distance from the jth acoustic horn 1 to the first sensor 8 in the 1 st electric field dust removing area 6 and the distance from the j +1 th acoustic horn 1 to the first sensor 8 in the 1 st electric field dust removing area 6,
the acoustic wave region control system 3 calculates Δ L respectively2，ΔL3，ΔL4(ii) a The acoustic wave zone control system 3 calculates
The acoustic region control system 3 calculates an average value of differences between distances from the jth acoustic horn 1 to the second sensor 9 in the ith electric field dust-free region 7 and distances from the j +1 th acoustic horn 1 to the second sensor 9 in the ith electric field dust-free region 7,
the acoustic wave region control system 3 calculates Δ L respectively2'，ΔL3'，ΔL4'，ΔL5'; the sound wave zone control system (3) calculates
3 sound wave sound transmission horns (1) emit the same frequency f and P0The sound wave of sound pressure, the sound source sent by the 1 st sound wave transmitting horn 1 is:
the sound source emitted by the 2 nd sound wave transmission horn 1 is as follows:
the sound source emitted by the 3 rd sound wave transmission horn 1 is as follows:
after the 3 sound sources are superposed:
when in use
When the temperature of the water is higher than the set temperature,
a maximum of 9 sound wave superpositions is taken,
when in use
When the temperature of the water is higher than the set temperature,
2 takes a minimum value of 0, the sound waves cancel.
The sound wave area control system 3 determines the initial sound wave frequency according to the condition that the wave length is integral multiple of the wave length and the wave length is odd multiple of the half wave length, and adjusts the frequency f and the initial phase of the sound source through feedback
Make the interior sound wave of dust removal region 6 superpose and make and avoid the regional 7 sound waves of raise dust to offset, specifically do:
for the sake of convenience in the following description,
(1) let Δ L be 20m and Δ L' be 10 m. The sound velocity c is 340 m/s;
calculating the frequency corresponding to 1 and 2 … n wavelengths as Δ L: f. of1＝(1、2…n)×340/20＝17、…17n
Calculating the DeltaL' as the frequency corresponding to 1/2 and 3/2 … … 2n-1/2 wavelengths: f. of2＝(1/2、3/2…2n-1/2)×340/10＝17、…17(2n-1)。
Get when | f1-f20, 17, 51, 85, … …, and f is controlledmin17 Hz. Where Δ L corresponds to a value of n of 1, i.e., Δ L is at 17Hz, a distance of 1 acoustic wavelength. In this case, Δ L 'corresponds to n having a value of 1, i.e., Δ L' is at 17Hz and is 1/2 acoustic wavelengths apart. The sound wave area control system 3 controls the J sound wave transmitting horns 1 to sound at the same initial phase;
(2) let Δ L be 17m and Δ L' be 10 m. The sound velocity c is 340 m/s;
calculating the frequency corresponding to 1 and 2 … n wavelengths as Δ L: f. of1＝(1、2…n)×340/17＝20、…20n
Calculating the DeltaL' as the frequency corresponding to 1/2 and 3/2 … … 2n-1/2 wavelengths: f. of2＝(1/2、3/2…2n-1/2)×340/10＝17、…17(2n-1)。
Calculate min | f1-f2|＝1，f＝(f1,f2) F is controlled to f (120,119), (220,221) … …1minAt 120Hz, Δ L corresponds to a value of 6 for n, i.e., Δ L is at 120Hz and is at a distance of 6 acoustic wavelengths. In this case Δ L 'corresponds to a value of n > 4, i.e. Δ L' is at 120Hz at a distance of > 7/2 acoustic wavelengths. The acoustic wave zone control system 3 satisfies
The initial phase of the condition controls the J sound transmission horns 1 to sound according to different initial phases, simultaneously enhances the intensity of J sound sources,
an electrostatic precipitator, characterized in that a plurality of dust chambers 5 are arranged in the electrostatic precipitator, and each dust chamber 5 is provided with the zone control sound wave soot blower of claim 1.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (4)
1. A region control sound wave soot blower is characterized by comprising a sound wave generator (2), a sound wave transmission horn (1) and a sound wave region control system (3); the sound transmission cartridges (1) are uniformly arranged at the inlet of the dust removing chamber (5), and each sound transmission cartridge (1) is connected with a sound generator (2); a dust removing area (6) and a dust raising avoiding area (7) are arranged in the dust removing chamber (5), a plurality of electric fields are arranged in the dust removing chamber (5), and at least one first sensor (8) is arranged in the dust removing area (6) in each electric field and used for detecting the sound wave intensity in the dust removing area (6) in the electric field; at least one second sensor (9) is arranged in the dust emission prevention area (7) in each electric field and used for detecting the intensity of sound waves in the dust emission prevention area (7) in the electric field;
the sound wave area control system (3) is used for enabling the phase of sound waves reaching each dust removing area (6) to be the same and the phase of sound waves reaching each dust raising avoiding area (7) to be opposite by controlling the frequency, the intensity and the initial phase of sound waves emitted by each sound wave generator (2) according to the detection value of the first sensor (8), the detection value of the second sensor (9) and the position of the sound wave sound transmission horn (1);
the dust chamber (5) is divided into a dust-raising-avoiding area (7) and a dust-removing area (6): n electric fields are arranged in the dust removal chamber (5), J sound wave sound transmission horns (1) are arranged at the inlet of the dust removal chamber (5), the Nth electric field is a dust raising avoiding region (7), and regions 2m above a dust hopper in the 1 st electric field, the 2 nd electric field …, the ith electric field and the … Nth-1 th electric field are dust raising avoiding regions (7) respectively; the rest areas of the No. 1 electric field, the No. 2 electric field … and the No. i electric field … and the No. N-1 electric field are ash removing areas (6) respectively;
determining the distance L between the jth acoustic wave microphone (1) and the first sensor (8) in the ith electric field dust removing area (6)j,iDetermining a distance L 'from the jth acoustic microphone (1) to the second sensor (9) in the ith electric field dust-free region (7)'j,i；
The sound wave area control system (3) calculates the average value of the distance difference between the jth sound wave microphone (1) and the first sensor (8) in the ith electric field dust removing area (6) and the distance difference between the jth +1 sound wave microphone (1) and the first sensor (8) in the ith electric field dust removing area (6),
the sound wave zone control system (3) calculates
The sound wave area control system (3) calculates the average value of the distance difference between the jth sound wave transmission horn (1) and the second sensor (9) in the ith electric field dust-raising-avoiding area (7) and the distance difference between the jth +1 sound wave transmission horn (1) and the second sensor (9) in the ith electric field dust-raising-avoiding area (7),
the sound wave zone control system (3) calculates
J sound wave transmitting horns (1) emit same frequencies f and P0The sound wave of sound pressure, the jth sound wave transmitting horn (1) sends out a sound source which is as follows:
wherein
An initial phase of a sound source emitted by the jth sound wave transmitting horn (1);
after J sound sources are superposed:
the sound wave area control system (3) determines the initial sound wave frequency according to the condition that the delta L is integral multiple of the wavelength and the delta L' is odd multiple of the half wavelength, and adjusts the frequency f and the initial phase of the sound source through feedback
The sound waves in the dust removing area (6) are superposed and the sound waves in the dust raising area (7) are resistedAnd (4) eliminating.
2. The zone control sound wave soot blower of claim 1, characterized in that the electric field communicating with the outlet of the dust chamber (5) is a dust-raising-avoiding zone (7), the zone in the residual electric field 2m above the ash hopper is a dust-raising-avoiding zone (7), and the rest of the zone in the residual electric field is a soot-removing zone (6).
3. The zone controlled acoustic sootblower of claim 1, wherein said acoustic zone control system (3) determines an initial acoustic frequency based on Δ L being an integral multiple of the wavelength and Δ L' being an odd multiple of the half wavelength, adjusting the frequency f and initial phase of the acoustic source by feedback
The method specifically comprises the following steps:
calculating the frequency of the Δ L corresponding to the integral multiple of the wavelength: f. of1＝(nλ)×c/ΔL，
Calculating the frequency corresponding to the half-wavelength odd multiple of the DeltaL': f. of2(2n-1/2) λ xc/Δ L', wherein: λ is the wavelength m; c is the sound velocity m/s; n is a wavelength multiple;
if when f1-f2When | ═ 0, then the phase difference
The sound wave area control system (3) controls J sound wave transmitting sound horns (1) to sound at the same initial phase;
if min | f is present1-f2If l, then take f1minF, the acoustic zone control system (3) satisfies
And is
Condition determinationThe phase position controls the J sound transmission horns (1) to sound according to different initial phases, simultaneously enhances the intensity of J sound sources,
4. an electrostatic precipitator, characterized in that a plurality of dust chambers (5) are arranged in the electrostatic precipitator, and each dust chamber (5) is provided with a zone control sound wave soot blower according to claim 1.
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