CN110671946A - Anti-blocking structure and anti-blocking method of rotary hearth furnace flue gas waste heat utilization system - Google Patents
Anti-blocking structure and anti-blocking method of rotary hearth furnace flue gas waste heat utilization system Download PDFInfo
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- CN110671946A CN110671946A CN201911045707.3A CN201911045707A CN110671946A CN 110671946 A CN110671946 A CN 110671946A CN 201911045707 A CN201911045707 A CN 201911045707A CN 110671946 A CN110671946 A CN 110671946A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
- F23J2700/001—Ash removal, handling and treatment means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention provides an anti-blocking structure of a rotary hearth furnace flue gas waste heat utilization system, which is applied to the technical field of rotary hearth furnace flue gas waste heat utilization, and also relates to an anti-blocking method of the rotary hearth furnace flue gas waste heat utilization system. The anti-blocking structure of the rotary hearth furnace flue gas waste heat utilization system and the anti-blocking method of the rotary hearth furnace flue gas waste heat utilization system can be used for rapidly cleaning scaling objects of the heat exchangers by arranging the unique sound wave generators at the positions to circularly sweep, and greatly prolonging the blocking period of the heat exchangers of the rotary hearth furnace.
Description
Technical Field
The invention belongs to the technical field of rotary hearth furnace flue gas waste heat utilization, and particularly relates to an anti-blocking structure of a rotary hearth furnace flue gas waste heat utilization system and an anti-blocking method of the rotary hearth furnace flue gas waste heat utilization system.
Background
In recent years, on the basis of the technical development of the digestion and absorption foreign rotary hearth furnace, a plurality of enterprises invest and build rotary hearth furnace devices, and the rotary hearth furnace technology is gradually a hot spot in the field of solid waste treatment such as zinc-containing dust and mud treatment at home at present. The internal of the rotary hearth furnace is subjected to radiation heat transfer, the temperature in the rotary hearth furnace is 1200-1350 ℃, the temperature of flue gas exhausted by the rotary hearth furnace is as high as 900-1100 ℃, the emission of the flue gas of the rotary hearth furnace is large, the temperature is high, and the main aspect of the waste heat of the rotary hearth furnace is that if the waste heat is not utilized, the unit energy consumption of the rotary hearth furnace is very high, but the dust content of the flue gas of the rotary hearth furnace is large (the highest dust content reaches 30g/m3), and the smoke dust contains a large amount of Zn, Pb, K, Na, Cl and other elements, so that the caking property is very strong at high temperature, and the. At present, the mainstream technology for utilizing the high-temperature flue gas waste heat of the rotary hearth furnace at home and abroad (including Nippon Nissin iron, Kopu project, Taiwan Steel and the like) is to recover the flue gas waste heat of the rotary hearth furnace by adopting a combined mode of a waste heat boiler with an ash removal device and an air heat exchanger for online ash removal, but the main problems are that the heat exchanger is easy to block and the production operation rate of the rotary hearth furnace is influenced. Although a scraper and other mechanical ash removal devices are arranged in the heat exchanger, the problems that the scraper is easy to deform and break, the loss is serious, the descaling effect is limited and the like still exist. In order to reduce the influence of heat exchanger blockage on the production operation rate of the rotary hearth furnace, some rotary hearth furnace production lines adopt a mode of establishing two sets of heat exchangers for one-use-one-standby switching to organize production, but still have the problems of short switching period, high labor intensity of field workers and the like. How to prolong the blockage period of the rotary hearth furnace flue gas waste heat utilization heat exchanger for treating the zinc-containing dust and mud becomes a key problem for restricting the solid waste treatment capacity of the rotary hearth furnace.
Patent 'anti-blocking method for smoke system of metallurgical solid waste treatment rotary hearth furnace' with application number 201210059699.X, invents an anti-blocking method for smoke system of metallurgical solid waste treatment rotary hearth furnace, which mainly controls the temperature and flow field in the smoke system of rotary hearth furnace, especially controls the temperature range of each node in the system in the temperature range capable of avoiding high temperature blocking and low temperature blocking simultaneously, so that high temperature blocking and low temperature blocking are not generated in the system, thereby solving the problem of smoke system blocking in the recovery process of zinc and iron in metallurgical dust solid waste treatment of rotary hearth furnace. Because the smoke dust of the rotary hearth furnace for treating the solid waste is complex and the range of the bonding temperature of the smoke dust is wide, the method has very high actual operation difficulty and limited effect and can only slightly reduce the blockage problem of the heat exchanger. The patent with the application number of 201410467211.6 discloses an anti-clogging rotary hearth furnace flue gas treatment system and method, and the anti-clogging rotary hearth furnace flue gas treatment system and method mainly reduce heat exchanger clogging by controlling the temperature of heat exchangers entering each stage.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects of the prior art, the anti-blocking structure is simple in structure, the unique sound wave generator is arranged at the position to circularly and repeatedly sweep, so that scaling substances on the heat exchanger are gradually loosened by combining with the heat exchanger, and then the scaling substances on the heat exchanger are quickly cleaned under the strong action of the scraper, so that the blocking period of the heat exchanger of the rotary hearth furnace is greatly prolonged, the scraper loss is greatly reduced, the washing cost of the heat exchanger is reduced, the service life of the heat exchanger is prolonged, and the solid waste treatment capacity of the rotary hearth furnace is improved.
To solve the technical problems, the invention adopts the technical scheme that:
the invention relates to an anti-blocking structure of a rotary hearth furnace flue gas waste heat utilization system, which comprises a rotary hearth furnace body, wherein a flue gas pipeline is arranged on the rotary hearth furnace body, a plurality of heat exchangers are arranged in the flue gas pipeline from a pipeline inlet end to a pipeline outlet end according to gaps, an acoustic wave soot blower is arranged at the position of the pipeline inlet end of the flue gas pipeline, and an acoustic wave soot blower is arranged between every two adjacent heat exchangers in the flue gas pipeline.
The flue gas pipeline comprises a pipeline inlet section, a pipeline arc section and a pipeline discharge section, wherein the pipeline inlet section, the pipeline arc section and the pipeline discharge section of the flue gas pipeline are arranged to be of an n-shaped structure, a plurality of heat exchangers are arranged in the pipeline inlet section, a plurality of heat exchangers are arranged in the pipeline discharge section, and the working frequency of the sound wave soot blower is between 30Hz and 200 Hz.
A smoke pipeline of the anti-blocking structure of the rotary hearth furnace smoke waste heat utilization system is provided with a sound wave soot blower at the position of a pipeline inlet end of a pipeline inlet section, and a sound wave soot blower is arranged between adjacent heat exchangers in the pipeline inlet section.
The pipeline of flue gas pipeline 1 get into the section and set up a plurality of one-level heat exchangers and a plurality of second grade heat exchangers in, set up a plurality of tertiary heat exchangers and a plurality of level four heat exchangers in the pipeline discharge section of flue gas pipeline, one-level heat exchanger, second grade heat exchanger, tertiary heat exchanger, level four heat exchanger arrange in proper order from pipeline inlet end position to pipeline outlet end position.
And a sound wave soot blower is arranged on the side wall of the pipeline inlet section between the adjacent first-stage heat exchanger and the second-stage heat exchanger in the pipeline inlet section.
The invention also relates to an anti-blocking method for the rotary hearth furnace flue gas waste heat utilization system, which can combine scaling substances on a heat exchanger with the heat exchanger to be gradually loosened through the cyclic and reciprocating blowing of the unique sound wave generator arranged at the position, quickly clean the scaling substances of the heat exchanger under the strong action of the scraper, greatly prolong the blocking period of the rotary hearth furnace heat exchanger, greatly reduce the loss of the scraper, reduce the washing cost of the heat exchanger, prolong the service life of the heat exchanger and improve the solid waste treatment yield of the rotary hearth furnace.
The anti-blocking method of the rotary hearth furnace flue gas waste heat utilization system comprises the following anti-blocking steps: 1) after the rotary hearth furnace flue gas waste heat utilization system is started, flue gas enters from the inlet end of the pipeline and is discharged from the outlet end of the pipeline; 2) the control part controls the starting of the sound wave soot blower and adjusts the sound wave frequency of the sound wave soot blower 5, so that the sound wave frequency and the natural frequency of the scaling substances on the heat exchanger generate a resonance effect, and the scaling substances are gradually loosened by combining with the heat exchanger; 3) the control component controls the scraper of the rotary hearth furnace flue gas waste heat utilization system to act, and the scraper cleans loose scaling substances on the heat exchanger.
The control part controls the starting of the sound wave soot blower and adjusts the sound wave frequency of the sound wave soot blower, so that the sound wave frequency is changed back and forth in the range of 30Hz-80Hz and 80Hz-200Hz, and the cleaning of semi-liquid substances and solid particle substances in the scaling substances is realized.
After the control part controls the starting of the sound wave soot blower, the emission power of the sound wave soot blower is between 20000 sound tiles and 50000 sound tiles.
After the control part controls the sound wave soot blower to be started, the emission frequency of the sound wave soot blower positioned at the position of the inlet end of the pipeline inlet section is between 30Hz and 80Hz, the emission power is 20000 to 50000 sound tiles, and the sound pressure around the primary heat exchanger in the pipeline inlet section is more than 150 dB.
After the control part controls the sound wave soot blower to be started, the emission frequency range of the sound wave soot blower between the adjacent primary heat exchanger and the secondary heat exchanger in the pipeline entering section is 80Hz-200Hz, the emission power is 20000 sound tile-50000 sound tile, and the sound pressure around the secondary heat exchanger in the pipeline entering section is more than 150 dB.
By adopting the technical scheme of the invention, the following beneficial effects can be obtained:
the invention relates to an anti-blocking structure of a rotary hearth furnace flue gas waste heat utilization system and an anti-blocking method of the rotary hearth furnace flue gas waste heat utilization system, and provides an improved scheme aiming at the problems that in the prior art, a rotary hearth furnace for treating zinc-containing dust and mud has high waste heat utilization difficulty and heat exchanger blockage due to the fact that flue gas contains a large amount of low-melting-point and viscous substances such as Zn, Pb, K, Na and Cl. The invention has the innovation points that on the basis of the original heat exchanger scraper descaling, the sound wave soot blowers are arranged at the position of the inlet end of the flue gas pipeline, the sound wave soot blowers are arranged between every two adjacent heat exchangers in the flue gas pipeline (the installation position and the installation number of the sound wave soot blowers are very critical), different descaling frequencies are correspondingly set according to the test analysis of the scaling substances in the temperature interval of each heat exchanger (the parameters are very critical), the resonance effect is caused, so that the scaling substances on the heat exchangers are gradually loosened by combining with the heat exchangers, and then the scaling substances of the heat exchangers are quickly cleaned under the strong action of a scraper, so that the blocking period of the heat exchangers of the rotary hearth furnace is greatly prolonged. At present, the anti-blocking of the zinc-containing dust and mud treatment rotary hearth furnace flue gas waste heat utilization heat exchanger is performed at home and abroad, the main measure is to control the temperature entering each stage of heat exchanger, and the method has poor operability and limited effect. At present, the industrial problem that the smoke system of the rotary hearth furnace adopts the combination of the sound wave soot blower and the scraper to solve the blockage of the heat exchanger is not found. By adopting the structure, under the condition that the operation of the rotary hearth furnace and raw materials are basically unchanged, after the heat exchanger of the rotary hearth furnace is applied, the heat exchanger of the rotary hearth furnace is switched once from 3-4 days before, and is switched once after being improved to more than 20 days, the plugging period is prolonged by more than 500 percent, and the effect is obvious. According to the anti-blocking structure and the anti-blocking method for the rotary hearth furnace flue gas waste heat utilization system, the unique sound wave generator is arranged at the position to perform cyclic and reciprocating blowing, so that scaling substances on the heat exchanger are gradually loosened and combined with the heat exchanger, then the scaling substances on the heat exchanger are quickly cleaned under the strong action of the scraper, the blocking period of the rotary hearth furnace heat exchanger is greatly prolonged, the scraper loss is greatly reduced, the washing cost of the heat exchanger is reduced, the service life of the heat exchanger is prolonged, and the solid waste treatment capacity of the rotary hearth furnace is improved.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic structural diagram of an anti-blocking structure of a rotary hearth furnace flue gas waste heat utilization system according to the invention;
in the drawings, the reference numbers are respectively: 1. a flue gas duct; 2. a duct inlet end; 3. a conduit outlet end; 4. a heat exchanger; 5. a sound wave soot blower; 6. a pipe entry section; 7. a pipe arc segment; 8. a pipe discharge section; 9. a primary heat exchanger; 10. a secondary heat exchanger; 11. a tertiary heat exchanger; 12. a four-stage heat exchanger; 13. a rotary hearth furnace body.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relations among the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the description of the embodiments:
as shown in the attached figure 1, the anti-blocking structure of the rotary hearth furnace flue gas waste heat utilization system comprises a rotary hearth furnace body, wherein a flue gas pipeline 1 is arranged on the rotary hearth furnace body, a plurality of heat exchangers 4 are arranged between a pipeline inlet end 2 and a pipeline outlet end 3 in the flue gas pipeline 1 according to gaps, a sound wave soot blower 5 is arranged at the pipeline inlet end 2 of the flue gas pipeline 1, and a sound wave soot blower 5 is arranged between every two adjacent heat exchangers 4 in the flue gas pipeline 1. Above-mentioned structure, because of containing low melting point and stickness material such as a large amount of Zn, Pb, K, Na, Cl in the flue gas, waste heat utilization degree of difficulty is big among the rotary hearth furnace who handles zinc dust mud among the prior art, the heat exchanger blocks up the problem and proposes the improvement scheme. The invention has the innovation points that on the basis of the original heat exchanger scraper descaling, the sound wave soot blower 5 is arranged at the position of the pipeline inlet end 2 of the flue gas pipeline 1, the sound wave soot blower 5 is arranged between every two adjacent heat exchangers 4 in the flue gas pipeline 1 (the installation position and the installation quantity of the sound wave soot blowers are very critical), different descaling frequencies are correspondingly set according to the test analysis of the scaling substances in the temperature interval of each heat exchanger (the parameters are very critical), the resonance effect is caused, so that the scaling substances on the heat exchangers are gradually loosened by combining with the heat exchangers, and then the scaling substances of the heat exchangers are quickly cleaned under the strong action of a scraper, so that the blocking period of the heat exchangers of the rotary hearth furnace is greatly prolonged. At present, the anti-blocking of the zinc-containing dust and mud treatment rotary hearth furnace flue gas waste heat utilization heat exchanger is performed at home and abroad, the main measure is to control the temperature entering each stage of heat exchanger, and the method has poor operability and limited effect. By adopting the structure, under the condition that the operation of the rotary hearth furnace and raw materials are basically unchanged, after the heat exchanger of the rotary hearth furnace is applied, the heat exchanger of the rotary hearth furnace is switched once from 3-4 days before, and is switched once after being improved to more than 20 days, the plugging period is prolonged by more than 500 percent, and the effect is obvious. The anti-blocking structure of the rotary hearth furnace flue gas waste heat utilization system is simple in structure, and can be used for enabling scaling substances on the heat exchanger to be gradually loosened by circularly and repeatedly blowing the unique sound wave generator at the position, and then enabling the scaling substances on the heat exchanger to be quickly cleaned under the strong action of the original scraper, so that the blocking period of the rotary hearth furnace heat exchanger is greatly prolonged, the scraper loss is greatly reduced, the washing cost of the heat exchanger is reduced, the service life of the heat exchanger is prolonged, and the solid waste treatment capacity of the rotary hearth furnace is improved.
The flue gas pipeline 1 comprises a pipeline inlet section 6, a pipeline arc section 7 and a pipeline outlet section 8, the pipeline inlet section 6, the pipeline arc section 7 and the pipeline outlet section 8 of the flue gas pipeline 1 are arranged to be of an n-shaped structure, a plurality of heat exchangers 4 are arranged in the pipeline inlet section 6, a plurality of heat exchangers 4 are arranged in the pipeline outlet section 8, and the working frequency of the sound wave soot blower 5 is 30Hz-200 Hz. Above-mentioned structure, flue gas pipeline 1's pipeline entering section 6, pipeline arc section 7, pipeline discharge section 8 set up to be n font structure. The flue gas enters from the inlet end 2 of the pipeline, sequentially passes through the inlet section 6, the arc section 7 and the discharge section 8 of the pipeline, and is discharged from the outlet end 3 of the pipeline. According to the structure of the invention, the acoustic wave soot blower 5 is arranged according to the smoke trend characteristics of the smoke pipeline, so that the treatment of scaling substances is effectively realized, and the blockage of a heat exchanger is avoided.
A flue gas pipeline 1 of the anti-blocking structure of the rotary hearth furnace flue gas waste heat utilization system is provided with a sound wave soot blower 5 at a position of a pipeline inlet end 2 of a pipeline inlet section 6, and the sound wave soot blower 5 is arranged between adjacent heat exchangers 4 in the pipeline inlet section 6. According to the structure, the sound wave soot blower is arranged according to the structural characteristics and the smoke trend characteristics of the smoke pipeline, so that the treatment of scaling substances is realized.
The pipeline of flue gas pipeline 1 get into section 6 in set up a plurality of one-level heat exchangers 9 and a plurality of second grade heat exchanger 10, set up a plurality of tertiary heat exchangers 11 and a plurality of level four heat exchangers 12 in the pipeline discharge section 8 of flue gas pipeline 1, one-level heat exchanger 9, second grade heat exchanger 10, tertiary heat exchanger 11, level four heat exchangers 12 are arranged according to the order from pipeline entrance point 2 position to pipeline exit end 3 position. And a sound wave soot blower 5 is arranged on the side wall of the pipeline inlet section 6 between the adjacent first-stage heat exchanger 9 and the second-stage heat exchanger 10 in the pipeline inlet section 6 of the flue gas pipeline.
The anti-blocking structure of the rotary hearth furnace flue gas waste heat utilization system is provided based on the arrangement structure and the working principle of the flue gas pipeline and the heat exchanger of the rotary hearth furnace flue gas waste heat utilization system, and therefore the problems in the prior art can be effectively solved.
The structure and method of the invention: (1) the high-sound-intensity sound wave soot blower capable of adjusting frequency is respectively installed at the pipeline inlet end (the inlet of the first-stage heat exchanger) of a flue gas pipeline of the rotary hearth furnace and the middle of the first-stage heat exchanger and the second-stage heat exchanger, the high-sound-intensity sound wave soot blower is respectively provided with a wide-mouth horn, the heat exchanger is swept by the high-sound-intensity sound wave generator in a circulating reciprocating mode, scaling substances at the position of the heat exchanger are gradually loosened by combining with the heat exchanger, and then the scaling substances of the heat exchanger are quickly cleaned under the action of a scraper. (2) In the above (1), the resonance effect is caused when the acoustic wave frequency is the same as the natural frequency of the substance and the acoustic wave energy is large with respect to the physical property of the fouling substance, that is, the natural frequency of the substance. According to the test analysis of the scaling substances under the working condition of the rotary hearth furnace heat exchanger, the natural frequency of the obtained scaling substances is divided into two parts, one part is semi-liquid substances (30Hz-80Hz), and the other part is solid particles (80Hz-200Hz), so the working frequency of the acoustic wave soot blower used in the technical scheme is 30Hz-200 Hz. (3) In the step (1), after the frequency of the acoustic wave soot blower is determined, in order to further improve the descaling effect, the emission power of the acoustic wave soot blower is required to be 20000 sound tile-50000 sound tile according to the viscosity of the scaling substances under the working condition. (4) In the step (1), the acoustic wave soot blower is required to be installed at the inlet of the first-stage heat exchanger because the heat exchanger used by the rotary hearth furnace is divided into four stages, the temperature of the first-stage heat exchanger at the flue gas inlet is about 350-450 ℃, partial scaling substances are in a semi-liquid state, the viscosity is strongest, and the blockage is the most serious, 1 frequency-adjustable high-acoustic-intensity acoustic wave soot blower is installed at the flue gas inlet, the emission frequency range is 30Hz-80Hz, and the emission power is 20000-50000 acoustic tiles, so that the sound pressure around the first-stage heat exchanger is above 150dB, the scaling substances are combined with the heating surface to be gradually loosened under the resonance effect, and then the scaling substances of the first-stage heat exchanger are basically cleaned under the effect of the scraper. (5) In the above (1), the frequency-adjustable high-sound strong-sound soot blower is further installed between the primary heat exchanger and the secondary heat exchanger, because the fouling of the primary heat exchanger is greatly reduced after the frequency-adjustable high-sound strong-sound soot blower installed in the primary heat exchanger is used, but because the smoke direction is opposite to the falling direction of the fouling, the fouling is greatly carried to the secondary heat exchanger by the smoke, the smoke temperature at the inlet of the secondary heat exchanger is about 300-350 ℃, the fouling is solid particles, 1 frequency-adjustable high-sound strong-sound soot blower is installed at the outlet of the primary heat exchanger and the inlet of the secondary heat exchanger, the emission frequency range is 80Hz-200Hz, the emission power is 20000-50000 sound tiles, so that the sound pressure around the secondary heat exchanger is above 150dB, the fouling is gradually loosened by being combined with the heated surface under the resonance effect, and under the effect of the scraper, the secondary heat exchanger foulants are substantially cleaned. (6) In the above (1), the acoustic soot blower is made of alloy, and the horn and the related components are made of stainless steel materials of 304 or more. (7) When the flue gas enters the third-stage heat exchanger, the temperature of the flue gas is reduced to 250-300 ℃, the viscosity of the smoke dust is greatly reduced due to the temperature reduction, the flue gas flow direction of the third-stage heat exchanger and the flue gas flow direction of the fourth-stage heat exchanger are consistent with the gravity direction of the smoke dust, and meanwhile, the sound intensity of the sound wave soot blowers arranged on the first-stage heat exchanger and the second-stage heat exchanger is weakened when reaching the third-stage heat exchanger and the fourth-stage heat exchanger in the same pipeline cavity, but still has a certain effect; above three kinds of factors stack, and the smoke and dust is at tertiary heat exchanger, level four heat exchanger scale deposit degree very slightly, and a large amount of smoke and dust no longer scale deposit in the heat exchanger, but follow-up dust removal sack is got into along with the flue gas, has prolonged the jam cycle of heat exchanger by a wide margin.
The invention also relates to an anti-blocking method for the rotary hearth furnace flue gas waste heat utilization system, which can combine scaling substances on a heat exchanger with the heat exchanger to be gradually loosened through the cyclic and reciprocating blowing of the unique sound wave generator arranged at the position, quickly clean the scaling substances of the heat exchanger under the strong action of the scraper, greatly prolong the blocking period of the rotary hearth furnace heat exchanger, greatly reduce the loss of the scraper, reduce the washing cost of the heat exchanger, prolong the service life of the heat exchanger and improve the solid waste treatment yield of the rotary hearth furnace.
The anti-blocking method of the rotary hearth furnace flue gas waste heat utilization system comprises the following anti-blocking steps: 1) after the rotary hearth furnace flue gas waste heat utilization system is started, flue gas enters from the inlet end 2 of the pipeline and is discharged from the outlet end 3 of the pipeline; 2) the control part controls the starting of the sound wave soot blower 5 and adjusts the sound wave frequency of the sound wave soot blower 5, so that the sound wave frequency and the natural frequency of the scaling substances on the heat exchanger generate a resonance effect, and the scaling substances are gradually loosened by combining with the heat exchanger; 3) The control component controls the scraper of the rotary hearth furnace flue gas waste heat utilization system to act, and the scraper cleans loose scaling substances on the heat exchanger.
The control part controls the starting of the acoustic wave soot blower 5 and adjusts the acoustic wave frequency of the acoustic wave soot blower 5, so that the acoustic wave frequency is changed in the range of 30Hz-80Hz and 80Hz-200Hz in a reciprocating manner, and the cleaning of semi-liquid substances and solid particle substances in the scaling substances is realized.
After the control part controls the sound wave soot blower 5 to be started, the emission power of the sound wave soot blower 5 is between 20000 sound tiles and 50000 sound tiles.
After the control part controls the sound wave soot blower 5 to be started, the emission frequency of the sound wave soot blower 5 positioned at the position of the pipeline inlet end 2 of the pipeline inlet section 6 is between 30Hz and 80Hz, the emission power is 20000 sound tile to 50000 sound tile, and the sound pressure around the primary heat exchanger 9 in the pipeline inlet section 6 is more than 150 dB.
After the control part controls the sound wave soot blower 5 to be started, the emission frequency range of the sound wave soot blower 5 between the adjacent primary heat exchanger 9 and the secondary heat exchanger 10 in the pipeline entering section 6 is 80Hz-200Hz, the emission power is 20000 sound tile-50000 sound tile, and the sound pressure around the secondary heat exchanger 10 in the pipeline entering section 6 is more than 150 dB.
The invention relates to an anti-blocking structure of a rotary hearth furnace flue gas waste heat utilization system, which comprises the following steps of:
the temperature of the flue gas entering the primary heat exchanger of the rotary hearth furnace is 400 ℃, the emission frequency of an acoustic wave soot blower at the inlet of the primary heat exchanger is 50Hz, and the power of the acoustic wave soot blower is 30000 acoustic tiles; the emission frequency of the sound wave soot blower arranged between the primary heat exchanger and the secondary heat exchanger is 150Hz, the power of the sound wave soot blower is 30000 sound tiles, the maximum sound pressure in the primary heat exchanger is 184dB, the sound pressure around the primary heat exchanger and the secondary heat exchanger is more than 150dB, and the heat exchangers can be switched after 23 days.
The invention relates to an anti-blocking structure of a rotary hearth furnace flue gas waste heat utilization system, which comprises the following steps of:
the temperature of the flue gas entering the primary heat exchanger of the rotary hearth furnace is 450 ℃, the emission frequency of an acoustic wave soot blower at the inlet of the primary heat exchanger is 30Hz, and the power of the acoustic wave soot blower is 30000 acoustic tiles; the emission frequency of the sound wave soot blower arranged between the primary heat exchanger and the secondary heat exchanger is 100Hz, the power of the sound wave blower is 30000 sound tiles, the maximum sound pressure in the primary heat exchanger is 198dB, the sound pressure around the primary heat exchanger and the secondary heat exchanger is more than 150dB, and the heat exchangers can be switched after being used for 21 days.
The invention relates to an anti-blocking structure of a rotary hearth furnace flue gas waste heat utilization system, which comprises the following steps of:
the temperature of the flue gas entering a primary heat exchanger of the rotary hearth furnace is 450 ℃, the emission frequency of a sound wave soot blower at the inlet of the primary heat exchanger is 50Hz, and the power of the sound wave soot blower is 50000 sound tiles; the emission frequency of a sound wave soot blower arranged between the primary heat exchanger and the secondary heat exchanger is 150Hz, the power of the sound wave soot blower is 50000 sound tile, the maximum sound pressure in the primary heat exchanger exceeds 190dB, the sound pressure around the primary heat exchanger and the secondary heat exchanger is above 150dB, and the heat exchangers can be switched after 42 days.
The invention relates to an anti-blocking structure of a rotary hearth furnace flue gas waste heat utilization system and an anti-blocking method of the rotary hearth furnace flue gas waste heat utilization system, and provides an improved scheme aiming at the problems that in the prior art, a rotary hearth furnace for treating zinc-containing dust and mud has high waste heat utilization difficulty and heat exchanger blockage due to the fact that flue gas contains a large amount of low-melting-point and viscous substances such as Zn, Pb, K, Na and Cl. The invention has the innovation points that on the basis of the original heat exchanger scraper descaling, the sound wave soot blowers are arranged at the position of the inlet end of the flue gas pipeline, the sound wave soot blowers are arranged between every two adjacent heat exchangers in the flue gas pipeline (the installation position and the installation number of the sound wave soot blowers are very critical), different descaling frequencies are correspondingly set according to the test analysis of the scaling substances in the temperature interval of each heat exchanger (the parameters are very critical), the resonance effect is caused, so that the scaling substances on the heat exchangers are gradually loosened by combining with the heat exchangers, and then the scaling substances of the heat exchangers are quickly cleaned under the strong action of a scraper, so that the blocking period of the heat exchangers of the rotary hearth furnace is greatly prolonged. At present, the anti-blocking of the zinc-containing dust and mud treatment rotary hearth furnace flue gas waste heat utilization heat exchanger is performed at home and abroad, the main measure is to control the temperature entering each stage of heat exchanger, and the method has poor operability and limited effect. At present, the industrial problem that the smoke system of the rotary hearth furnace adopts the combination of the sound wave soot blower and the scraper to solve the blockage of the heat exchanger is not found. By adopting the structure, under the condition that the operation of the rotary hearth furnace and raw materials are basically unchanged, after the heat exchanger of the rotary hearth furnace is applied, the heat exchanger of the rotary hearth furnace is switched once from 3-4 days before, and is switched once after being improved to more than 20 days, the plugging period is prolonged by more than 500 percent, and the effect is obvious. According to the anti-blocking structure and the anti-blocking method for the rotary hearth furnace flue gas waste heat utilization system, the unique sound wave generator is arranged at the position to perform cyclic and reciprocating blowing, so that scaling substances on the heat exchanger are gradually loosened and combined with the heat exchanger, then the scaling substances on the heat exchanger are quickly cleaned under the strong action of the scraper, the blocking period of the rotary hearth furnace heat exchanger is greatly prolonged, the scraper loss is greatly reduced, the washing cost of the heat exchanger is reduced, the service life of the heat exchanger is prolonged, and the solid waste treatment capacity of the rotary hearth furnace is improved.
The present invention has been described in connection with the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, changes and equivalents of the embodiments of the invention, and its application to other applications without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a rotary hearth furnace flue gas waste heat utilization system prevents stifled structure which characterized in that: including the rotary hearth furnace body, the rotary hearth furnace body on set up flue gas pipeline (1), set up a plurality of heat exchangers (4) according to the clearance in flue gas pipeline (1) between from pipeline entrance point (2) to pipeline exit end (3), pipeline entrance point (2) position of flue gas pipeline (1) sets up sound wave soot blower (5), sets up sound wave soot blower (5) between every two adjacent heat exchangers (4) in flue gas pipeline (1).
2. The anti-blocking structure of the rotary hearth furnace flue gas waste heat utilization system according to claim 1, characterized in that: flue gas pipeline (1) including pipeline entering section (6), pipeline segmental arc (7), pipeline discharge section (8), the pipeline entering section (6), pipeline segmental arc (7), pipeline discharge section (8) of flue gas pipeline (1) set up to be n font structure, set up a plurality of heat exchangers (4) in pipeline entering section (6), set up a plurality of heat exchangers (4) in pipeline discharge section (8), the operating frequency of sound wave soot blower (5) between 30Hz-200 Hz.
3. The anti-blocking structure of the rotary hearth furnace flue gas waste heat utilization system according to claim 2, characterized in that: the flue gas pipeline (1) of the anti-blocking structure of the rotary hearth furnace flue gas waste heat utilization system is provided with a sound wave soot blower (5) at the position of a pipeline inlet end (2) of a pipeline inlet section (6), and the sound wave soot blower (5) is arranged between adjacent heat exchangers (4) in the pipeline inlet section (6).
4. The anti-blocking structure of the rotary hearth furnace flue gas waste heat utilization system according to claim 2 or 3, characterized in that: the pipeline of flue gas pipeline (1) get into section (6) in set up a plurality of one-level heat exchangers (9) and a plurality of second grade heat exchanger (10), set up a plurality of tertiary heat exchangers (11) and a plurality of level four heat exchangers (12) in pipeline discharge section (8) of flue gas pipeline (1), one-level heat exchanger (9), second grade heat exchanger (10), tertiary heat exchanger (11), level four heat exchanger (12) are arranged according to order from pipeline entrance point (2) position to pipeline exit end (3) position.
5. The anti-blocking structure of the rotary hearth furnace flue gas waste heat utilization system according to claim 4, characterized in that: and a sound wave soot blower (5) is arranged on the side wall of the pipeline inlet section (6) between the adjacent first-stage heat exchanger (9) and second-stage heat exchanger (10) in the pipeline inlet section (6).
6. The anti-blocking method for the flue gas waste heat utilization system of the rotary hearth furnace is characterized by comprising the following steps of: the anti-blocking method of the rotary hearth furnace flue gas waste heat utilization system comprises the following anti-blocking steps: 1) after the rotary hearth furnace flue gas waste heat utilization system is started, flue gas enters from the inlet end (2) of the pipeline and is discharged from the outlet end (3) of the pipeline; 2) the control part controls the starting of the sound wave soot blower (5) and adjusts the sound wave frequency of the sound wave soot blower (5), so that the sound wave frequency and the natural frequency of the scaling substances on the heat exchanger generate a resonance effect, and the scaling substances are combined with the heat exchanger and gradually loosened; 3) the control component controls the scraper of the rotary hearth furnace flue gas waste heat utilization system to act, and the scraper cleans loose scaling substances on the heat exchanger.
7. The anti-blocking method for the flue gas waste heat utilization system of the rotary hearth furnace according to claim 6, characterized in that: the control part controls the starting of the sound wave soot blower (5) and adjusts the sound wave frequency of the sound wave soot blower (5) to enable the sound wave frequency to change back and forth in the range of 30Hz-80Hz and 80Hz-200Hz, and the cleaning of semi-liquid substances and solid particle substances in the scaling substances is realized.
8. The anti-blocking method for the flue gas waste heat utilization system of the rotary hearth furnace according to claim 6 or 7, characterized in that: after the control part controls the starting of the sound wave soot blower (5), the emission power of the sound wave soot blower (5) is 20000-50000 sound tiles.
9. The anti-blocking method for the flue gas waste heat utilization system of the rotary hearth furnace according to claim 6, characterized in that: after the control part controls the sound wave soot blower (5) to be started, the emission frequency of the sound wave soot blower (5) positioned at the position of the pipeline inlet end (2) of the pipeline inlet section (6) is between 30Hz and 80Hz, the emission power is 20000 sound tiles to 50000 sound tiles, and the sound pressure around the primary heat exchanger (9) in the pipeline inlet section (6) is more than 150 dB.
10. The anti-blocking method for the flue gas waste heat utilization system of the rotary hearth furnace according to claim 6 or 9, characterized in that: after the control part controls the sound wave soot blower (5) to be started, the emission frequency range of the sound wave soot blower (5) between the adjacent first-stage heat exchanger (9) and the second-stage heat exchanger (10) in the pipeline entering section (6) is 80Hz-200Hz, the emission power is 20000 sound tiles-50000 sound tiles, and the sound pressure around the second-stage heat exchanger (10) in the pipeline entering section (6) is more than 150 dB.
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