CN114524628B - Double-chamber lime kiln system without dust leakage and pressure relief method - Google Patents
Double-chamber lime kiln system without dust leakage and pressure relief method Download PDFInfo
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- CN114524628B CN114524628B CN202210191304.5A CN202210191304A CN114524628B CN 114524628 B CN114524628 B CN 114524628B CN 202210191304 A CN202210191304 A CN 202210191304A CN 114524628 B CN114524628 B CN 114524628B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Physics & Mathematics (AREA)
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a dust-free and leakage-free double-chamber lime kiln system and a pressure relief method. The double-chamber lime kiln system without dust leakage adopts a multistage decompression strategy, realizes rapid impact-free decompression of kiln chambers, removes dust from decompressed waste gas, and avoids the problem of high-concentration dust waste gas emission in the reversing process of the existing double-chamber lime kiln.
Description
1 in the technical field
The invention relates to the technical field of double-chamber lime kiln equipment, in particular to a double-chamber lime kiln system free of dust leakage and a pressure relief method.
2 background art
The double-chamber lime kiln is one of the most advanced lime production equipment at present, and is widely applied to the production of industrial lime and building lime. The kiln mainly comprises two vertical kiln bores which are mirror images of each other, wherein in the production process, coal dust and combustion-supporting air are supplied into one side of the kiln bore to form a high-temperature environment, so that limestone in the kiln bore is decomposed at high temperature and is called as a combustion chamber; and filling normal-temperature materials into the kiln chamber at the other side, introducing high-temperature smoke formed by the combustion chamber from the bottom, and discharging the smoke from the top to achieve the effect of preheating the materials, wherein the kiln chamber at the other side is called as a heat storage chamber. After one period (about 14 min), the two kiln bores exchange roles with each other, so that continuous production of lime is realized. The method adopts a double-hearth calcining-cycle reversing process, and the high-temperature flue gas generated by calcining and the high-temperature waste gas formed by cooling the finished product are used for preheating materials and then discharged out of the kiln hearth, and the exhaust gas temperature can be reduced to about 120 ℃ generally, so that the method has high heat utilization rate.
In the reversing process of the double-hearth kiln, the pressure (about 40 kP) in the combustion hearth is released through the relief valves on the combustion-supporting air pipeline and the cooling air pipeline, so that the pressure of the hearth is reduced to normal pressure. The diffusing valve can quickly and effectively reduce the pressure in the hearth to normal pressure, but also can cause serious dust pollution, so that the working condition environment of the lime kiln is worsened. The method is characterized in that in the pressure release process of the relief valve, waste gas rich in CaO powder and other particles in the kiln chamber is sprayed out from an outlet of the relief valve, so that high-concentration dust waste gas is discharged outside the relief valve in the pressure release process, and the problem that dust discharge in the vicinity of the relief valve exceeds the intermittent standard is solved.
3 summary of the invention
The double-chamber lime kiln system without dust leakage solves the technical problem that the external interface of a bleeding valve discharges high-concentration dust waste gas in the existing reversing and pressure releasing process of the double-chamber lime kiln, so that the dust discharge near the bleeding valve exceeds the standard intermittently.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a no dust leaks two thorax limekilns systems, including cooling air supply subassembly, combustion-supporting air reversing subassembly, flue gas reversing subassembly, dust removal exhaust assembly, decompression buffer assembly and have two thorax kiln bodies, cooling air supply subassembly is used for supplying cooling air to the kiln thorax in from the bottom of kiln thorax, combustion-supporting air supply subassembly is used for supplying combustion-supporting air to the combustion-supporting air reversing subassembly in, combustion-supporting air reversing subassembly is used for carrying combustion-supporting air to one of them kiln thorax in, and carry the waste heat flue gas in another kiln thorax in to the flue gas reversing subassembly, or combustion-supporting air reversing subassembly is used for carrying two kiln chambeies intercommunication so that the high pressure flue gas in one of them kiln thorax carries to another kiln thorax in, or combustion-supporting air reversing subassembly is used for leading into the waste heat flue gas that the kiln thorax reversing subassembly output in the dust removal exhaust assembly, or flue gas reversing subassembly is used for carrying out the depressurization back to the decompression buffer assembly in the high pressure flue gas that the combustion-supporting air reversing subassembly output in the combustion-supporting air reversing subassembly.
Further, the combustion-supporting air reversing assembly comprises a reversing body, two hearth interfaces arranged on the reversing body, a combustion-supporting air interface arranged on the reversing body and communicated with the combustion-supporting air supply assembly, and a smoke interface arranged on the reversing body and communicated with the smoke reversing assembly, wherein the hearth interfaces and the kiln bores are arranged in one-to-one correspondence, the combustion-supporting air supplied by the combustion-supporting air supply assembly is conveyed to one hearth through adjusting the reversing body, and waste heat smoke in a heat storage hearth in the other hearth is conveyed to the smoke reversing assembly, or the two kiln bores are communicated to convey high-pressure smoke in one kiln hearth to the other kiln hearth, or the high-pressure smoke in the kiln hearth is conveyed to the smoke reversing assembly.
Further, the reversing body comprises two reversing valves which are mutually communicated through an air return pipe, each reversing valve comprises a reversing valve plug and a three-way reversing valve body extending along the length direction, each three-way reversing valve body is respectively provided with a smoke interface, a combustion air interface and a hearth interface, the combustion air interfaces of the two three-way reversing valve bodies are communicated through the air return pipe, reversing cavities are arranged in the three-way reversing valve bodies, the reversing valve plug is movably arranged in the reversing cavities and used for enabling the hearth interfaces to be communicated with the smoke interfaces through the reversing cavities or enabling the hearth interfaces to be communicated with the combustion air interfaces through the reversing cavities, the combustion air interface is arranged on the upper portion of the three-way reversing valve body and used for blowing combustion air downwards from the upper portion of the three-way reversing valve body, the hearth interfaces are arranged on the lateral sides of the reversing valve body, and the cavity bottom surfaces of the hearth interfaces are flush with the cavity bottom surfaces of the reversing cavities.
Further, the flue gas reversing assembly comprises a reversing valve core and a three-way reversing valve shell, a first interface communicated with the flue gas interface, a second interface communicated with the dedusting exhaust assembly and a third interface communicated with the input port of the decompression buffer assembly are arranged on the three-way reversing valve shell, the output port of the decompression buffer assembly is connected with the dedusting exhaust assembly, a reversing cavity is arranged in the three-way reversing valve shell, and the reversing valve core is movably arranged in the reversing cavity and used for enabling the first interface to be communicated with the second interface through the reversing cavity or enabling the first interface to be communicated with the third interface through the reversing cavity or blocking the first interface.
Further, the decompression buffering assembly comprises decompression valves and buffering bins which are sequentially distributed along the airflow direction, the first ends of the decompression valves are connected with the smoke reversing assembly, the second ends of the decompression valves are connected with the first ends of the buffering bins, and the second ends of the buffering bins are connected with the dust removal exhaust assembly.
Further, the relief valve includes pressure release casing, relief pressure plug and pressure release reset spring, be equipped with the pressure release cushion chamber in the pressure release casing, the both ends of pressure release casing are equipped with pressure release air inlet and the pressure release gas vent with pressure release cushion chamber intercommunication respectively, pressure release plug and pressure release reset spring are all located the pressure release cushion intracavity, pressure release plug movably locates the pressure release cushion intracavity so that pressure release air inlet and pressure release cushion chamber intercommunication or cut off, pressure release reset spring's first end and pressure release plug fixed connection, pressure release reset spring's second end is fixed to be located the pressure release cushion intracavity, through pressure release reset spring's precompression and pressure release air inlet's air input that the pressure release air inlet got into the pressure release cushion chamber from the pressure release air inlet pressure differential control.
Further, the surge bin comprises a surge shell, partition plates, ash discharging valves and ash removing guns, a dust removing surge cavity is arranged in the surge shell, dust removing air inlets and dust removing air outlets which are communicated with the dust removing surge cavity are respectively arranged at two sides of the surge shell, the dust removing air inlets are connected with the second ends of the pressure reducing valves, the dust removing air outlets are connected with dust removing air exhaust assemblies, the ash discharging valves and the partition plates are all arranged in the dust removing surge cavity, the ash discharging valves are sequentially arranged along the length direction of the surge shell and enclose with the bottom of the surge shell to form ash hoppers, the partition plates are arranged at intervals along the length direction of the surge shell, two adjacent partition plates are arranged in a staggered mode along the height direction of the surge shell to form an S-shaped serpentine dust removing channel in the dust removing surge cavity, the dust removing air inlets and the dust removing air outlets are communicated through the S-shaped serpentine dust removing channel, and the ash discharging valves are arranged at the bottom of the S-shaped serpentine dust removing channel.
Further, the dust removal exhaust assembly comprises a dust remover, a dust removal fan and a smoke exhaust chimney which are sequentially arranged along the airflow direction and are mutually communicated, and an air inlet of the dust remover is respectively connected with the smoke reversing assembly and the decompression buffer assembly.
Further, the cooling air supply assembly comprises a cooling fan, a cooling air pipe, a cooling air pressure detector, a cooling air cut-off valve and a cooling air short-circuit valve, the cooling air pipe adopts a three-way pipe, the cooling air pipe is used for conveying cooling air flow provided by the cooling fan into a corresponding kiln chamber, the cooling air pressure detector is arranged on the cooling air pipe and used for detecting air flow pressure of the cooling air flow in the cooling air pipe, the cooling air cut-off valve is arranged on the cooling air pipe and is positioned on one side, close to the kiln chamber, of the cooling air pressure detector, and the cooling air short-circuit valve is arranged on the cooling air pipe and is positioned on one side, close to the cooling fan, of the cooling air pressure detector and used for refluxing cooling air flow provided by the cooling fan into the cooling fan.
The invention also provides a double-chamber lime kiln decompression method without dust leakage, when the double-chamber lime kiln is in a working state, combustion-supporting air is supplied into a combustion-supporting air reversing assembly through a combustion-supporting air supply assembly, cooling air is supplied into a heat storage chamber through a cooling air supply assembly, combustion-supporting air is supplied into a combustion chamber under the guidance of the combustion-supporting air reversing assembly, waste heat flue gas output by the heat storage chamber is conveyed into a flue gas reversing assembly, and the waste heat flue gas is led into a dust removal and exhaust assembly under the guidance of the flue gas reversing assembly and is exhausted through the dust removal and exhaust assembly; in the reversing process of the double-chamber lime kiln, firstly, stopping supplying combustion-supporting air to the combustion-supporting air supply assembly and stopping supplying cooling air to the heat accumulation chamber; then, the combustion chamber and the heat accumulation chamber are communicated through the combustion-supporting air supply assembly, so that high-pressure flue gas in the combustion chamber is conveyed into the heat accumulation chamber to realize primary decompression; then, the combustion chamber is communicated with a first connector of the smoke reversing assembly through the combustion-supporting air supply assembly, at the moment, the first connector of the smoke reversing assembly is communicated with a third connector, and under the matched guiding action of the combustion-supporting air supply assembly and the smoke reversing assembly, high-pressure smoke in the combustion chamber is sequentially discharged to the decompression buffer assembly after passing through the air supply assembly and the smoke reversing assembly; then, after the second-stage decompression is completed in the decompression buffering component, the second-stage decompression is led into the dedusting exhaust component and exhausted through the dedusting exhaust component.
The invention has the following beneficial effects:
the invention relates to a dust-free and leakage-free double-hearth lime kiln system which comprises a cooling air supply assembly, a combustion-supporting air reversing assembly, a flue gas reversing assembly, a dust removal and exhaust assembly, a decompression buffering assembly and a double-hearth kiln body with two kiln hearths. Before reversing, under the guidance of a combustion-supporting air reversing component, a combustion-supporting air supply component supplies combustion-supporting air into a combustion chamber, so that a smoke reversing component receives waste heat smoke in a heat storage chamber, the waste heat smoke is output to a dust removal exhaust component under the conduction of the smoke reversing component, and finally the dust removal exhaust component removes dust and then is discharged; in the reversing and pressure releasing process, two kiln bores are mutually communicated under the guidance of a combustion-supporting air reversing component, high-pressure flue gas in the combustion bores flows into the heat accumulation bores due to the pressure difference between the combustion bores and the heat accumulation bores, the pressure of the two kiln bores tends to be consistent, the first-stage pressure reduction of the combustion bores is realized, the flue gas reversing component receives the high-pressure flue gas in the combustion bores under the guidance of the combustion-supporting air reversing component, meanwhile, the high-pressure flue gas is input into a pressure reduction buffer component for pressure reduction under the conduction of the flue gas reversing component, the second-stage pressure reduction and dust removal are completed, and then normal-pressure flue gas is discharged after further dust removal and purification through a dust removal and exhaust component, so that the high-pressure flue gas in the combustion bores is discharged to reduce the pressure in the combustion bores, and the dust removal can be realized step by step, the technical problems that in the existing reversing and pressure releasing process, the flue gas released from the discharge valve is high in flow rate and pressure is large in periodical pulse fluctuation, high-concentration flue gas is discharged in the reversing and pressure releasing process, and intermittent overstock is discharged near the discharge valve are avoided.
In addition to the objects, features and advantages described above, the present application has other objects, features and advantages. The present application will be described in further detail with reference to the drawings.
Description of the drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic illustration of a dust-free, leak-free, dual-chamber lime kiln system in accordance with one embodiment of the application;
FIG. 2 is a schematic view of the combustion air reversing assembly of FIG. 1;
fig. 3 is a schematic view of the reversing valve of fig. 2 in a first state;
fig. 4 is a structural illustration of a second state of the reversing valve of fig. 2;
FIG. 5 is a side view of the reversing valve of FIG. 2;
FIG. 6 is a schematic view of the smoke diverting assembly of FIG. 1;
FIG. 7 is a schematic view of the pressure relief valve of the pressure relief cushion assembly of FIG. 1;
fig. 8 is a schematic view of the surge bin of the decompression absorption assembly of fig. 1.
Legend description:
100. a double-chamber lime kiln system without dust leakage; 10. a cooling air supply assembly; 11. a cooling fan; 12. a cooling air pipe; 13. a cooling air pressure detector; 14. a cooling air shut-off valve; 15. a cooling air short-circuit valve; 20. a combustion-supporting air supply assembly; 21. a combustion fan; 22. a combustion-supporting air pipe; 23. a combustion air short-circuit valve; 24. a combustion air pressure detector; 30. a combustion-supporting air reversing component; 31. a reversing body; 311. a reversing valve; 3111. a reversing valve plug; 3112. a three-way reversing valve body; 32. a hearth interface; 33. a combustion-supporting air interface; 34. a smoke interface; 40. a smoke reversing assembly; 41. a reversing valve core; 42. three-way reversing valve casing; 421. a first interface; 422. a second interface; 423. a third interface; 50. a dust removal exhaust assembly; 60. a decompression buffer assembly; 61. a pressure reducing valve; 62. a buffer bin; 621. a buffer housing; 622. a partition panel; 623. an ash discharge valve; 624. ash removing gun; 62. a buffer bin; 62. a buffer bin; 70. a double-hearth kiln body.
5 detailed description of the preferred embodiments
It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Referring to fig. 1, a dual-chamber lime kiln system 100 with no leakage of dust provided by the invention comprises a cooling air supply assembly 10, a combustion supporting air supply assembly 20, a combustion supporting air reversing assembly 30, a flue gas reversing assembly 40, a dust removal and exhaust assembly 50, a decompression buffer assembly 60 and a dual-chamber kiln body 70 with two kiln chambers, wherein the cooling air supply assembly 10 is used for supplying cooling air from the bottom of the kiln chambers into the kiln chambers, the combustion supporting air supply assembly 20 is used for supplying combustion supporting air into the combustion supporting air reversing assembly 30, the combustion supporting air reversing assembly 30 is used for conveying combustion supporting air into one of the kiln chambers and waste heat flue gas in the other kiln chamber into the flue gas reversing assembly 40, or the combustion supporting air reversing assembly 30 is used for communicating the two kiln chambers so as to enable high-pressure flue gas in one kiln chamber to be conveyed into the other kiln chamber, or the flue gas reversing assembly 30 is used for conveying high-pressure flue gas in the kiln chamber into the flue gas reversing assembly 40, and the flue gas reversing assembly 40 is used for guiding waste heat flue gas output by the combustion supporting air reversing assembly 30 into the dust removal and exhaust assembly 50, or the flue gas reversing assembly 40 is used for guiding waste heat flue gas output by the decompression buffer assembly 30 into the dust removal and the flue gas reversing assembly 50.
The invention provides a double-hearth lime kiln system 100 without dust leakage, which comprises a cooling air supply assembly 10, a combustion-supporting air supply assembly 20, a combustion-supporting air reversing assembly 30, a flue gas reversing assembly 40, a dust removal exhaust assembly 50, a decompression buffer assembly 60 and a double-hearth kiln body 70 with two kiln hearths. Before reversing, under the guidance of the combustion-supporting air reversing assembly 30, the combustion-supporting air supply assembly 20 supplies combustion-supporting air into the combustion chamber, the flue gas reversing assembly 40 receives residual heat flue gas in the heat storage chamber, the residual heat flue gas is output to the dust removal and exhaust assembly 50 under the conduction of the flue gas reversing assembly 40, and finally the residual heat flue gas is discharged after dust removal by the dust removal and exhaust assembly 50; in the reversing and pressure releasing process, two kiln bores are mutually communicated under the guidance of the combustion-supporting air reversing assembly 30, high-pressure flue gas in the combustion bores flows into the heat accumulation bores due to the pressure difference between the combustion bores and the heat accumulation bores, the pressure of the two kiln bores tends to be consistent, the first-stage pressure reduction of the combustion bores is realized, the flue gas reversing assembly 40 receives the high-pressure flue gas in the combustion bores under the guidance of the combustion-supporting air reversing assembly 30, meanwhile, the high-pressure flue gas is input into the pressure reducing buffer assembly 60 for pressure reduction under the conduction of the flue gas reversing assembly 40, the second-stage pressure reduction and dust removal are completed, and then the normal-pressure flue gas is discharged after further dust removal and purification through the dust removal and exhaust assembly 50, so that the high-pressure flue gas in the combustion bores is discharged to reduce the pressure in the combustion bores, and the high-pressure flue gas can be gradually reduced and removed, the technical problems that in the existing reversing and pressure releasing process of the kiln is released through a release valve directly communicated with the atmosphere, the flow rate of the waste gas released from the release valve is high, the pressure is high, periodical pulse fluctuation is presented, the high-concentration waste gas is discharged in the reversing and the pressure releasing process, and the waste gas is discharged in the pressure in the process, and the dust in the process is discharged in the intermittent and exceeds the standard.
It can be understood that the invention cancels the pressure relief and release valve of the existing double-chamber lime kiln, eliminates the dust discharge point of the release valve, realizes the rapid impact-free pressure relief of the kiln chamber by adopting a multistage pressure relief strategy, removes dust from the pressure relief waste gas, and avoids the problem of discharging high-concentration dust waste gas in the reversing process of the existing double-chamber lime kiln.
Referring to fig. 2, 3, 4 and 5, further, the combustion air reversing assembly 30 includes a reversing body 31, two furnace interfaces 32 provided on the reversing body 31, a combustion air interface 33 provided on the reversing body 31 for communicating with the combustion air supply assembly 20, and a flue gas interface 34 provided on the reversing body 31 for communicating with the flue gas reversing assembly 40, the furnace interfaces 32 are arranged in one-to-one correspondence with the furnace chambers, and the reversing body 31 is adjusted to convey the combustion air provided by the combustion air supply assembly 20 into one of the furnace chambers (combustion chambers), and convey the waste heat flue gas in the other furnace chamber (heat accumulation chamber) into the flue gas reversing assembly 40, or communicate the two furnace chambers to convey the high pressure flue gas in one of the furnace chambers (combustion chambers) into the other furnace chamber (heat accumulation chamber), or convey the high pressure flue gas in the furnace chamber (combustion chamber) into the flue gas reversing assembly 40. As can be appreciated, the double-chamber lime kiln system 100 without dust leakage comprises a plurality of switchable exhaust paths, before reversing, waste heat flue gas of a heat storage chamber enters the combustion air reversing assembly 30 from the kiln top, and under the guiding action of the combustion air reversing assembly 30 and the flue gas reversing assembly 40, the waste heat flue gas is discharged after passing through the dust removal exhaust assembly 50; when reversing and pressure releasing are carried out, high-pressure flue gas in the combustion chamber enters the combustion-supporting air reversing assembly 30 from the kiln top, enters the heat storage chamber until the pressures of the two kiln chambers tend to be consistent under the guiding action of the combustion-supporting air reversing assembly 30, and then enters the decompression buffer assembly 60 under the guiding action of the combustion-supporting air reversing assembly 30 and the flue gas reversing assembly 40, and is discharged through the dust removal exhaust assembly 50 after being further decompressed.
Further, the reversing body 31 includes two reversing valves 311 that are mutually communicated through air return pipes, each reversing valve 311 includes a reversing valve plug 3111 and a three-way reversing valve body 3112 extending along a length direction, each three-way reversing valve body 3112 is respectively provided with a flue gas port 34, a combustion air port 33 and a hearth port 32, the combustion air ports 33 of the two three-way reversing valve bodies 3112 are communicated through the air return pipes, a reversing cavity is arranged in the three-way reversing valve body 3112, the reversing valve plug 3111 is movably arranged in the reversing cavity and is used for enabling the hearth port 32 to be communicated with the flue gas port 34 through the reversing cavity or enabling the hearth port 32 to be communicated with the combustion air port 33 through the reversing cavity, the combustion air port 33 is arranged on the upper portion of the three-way reversing valve body 3112 and is used for blowing combustion air downwards from the upper portion of the three-way reversing valve body 3112, the hearth port 32 is arranged on the side direction of the three-way reversing valve body 3112, and the cavity bottom surface of the hearth port 32 is flush with the cavity bottom surface of the reversing cavity. As can be appreciated, the flue gas interface 34 and the combustion air interface 33 are oppositely arranged in the horizontal direction, the cavity bottom surface of the hearth interface 32 is flush with the cavity bottom surface of the reversing cavity, the flue gas interface 34 is positioned above the hearth interface 32, the flue gas interface 34 is arranged on the other side of the reversing valve 311, a gas inlet and a gas outlet which are used for communicating with the hearth interface 32 are arranged on the side wall of the hearth close to the top, when the reversing valve core 41 rotates to the flue gas outlet, the combustion air interface 33 is communicated with the hearth interface 32, and combustion air enters the hearth through the reversing valve 311, and the hearth is in a combustion hearth state; when the reversing valve plug 3111 rotates to the combustion air port 33, the flue gas port 34 is communicated with the hearth port 32, and kiln hearth waste gas enters the flue gas reversing assembly 40 through the reversing valve 311. The problems that in the working process of the existing double-chamber kiln, high dust gas in the kiln chamber is easy to deposit at the bottom of a valve when being discharged through an exhaust gas port, and in the next pressure relief process, the dust is discharged from a discharge valve outlet on a combustion-supporting air duct 22, so that the dust at the discharge valve outlet is amplified, and serious dust pollution is caused are solved.
Further, the reversing cavity is arranged along the length direction of the three-way reversing valve body 3112 in an extending manner, the hearth port 32 is arranged at the first end of the three-way reversing valve body 3112, and the flue gas port 34 and the combustion air port 33 are arranged close to the second end of the three-way reversing valve body 3112.
Further, the bottom surface of the reversing cavity is disposed obliquely upward from the direction from the first end toward the second end of the three-way reversing valve 3112, and the flow area of the reversing cavity is gradually contracted from the direction from the first end toward the second end of the three-way reversing valve 3112. By adopting the slope shape that the bottom surface of the reversing cavity is obliquely distributed upwards from the first end to the second end of the three-way reversing valve body 3112, the flow area near the hearth is maximum, the flow velocity is minimum, the flow area near the exhaust pipe is minimum, and the flow velocity is maximum; dust subsidence in the waste gas is concentrated near the hearth side in tee bend switching-over valve body 3112 bottom, when letting in combustion-supporting wind to the hearth, the dust of subsideing in furnace entrance is very easily blown back into the kiln chamber in, consequently can effectively avoid the deposit of dust in tee bend switching-over valve body 3112, and the dust exceeds standard when avoiding relief valve gas pressure release.
Referring to fig. 6, further, the smoke reversing assembly 40 includes a reversing valve core 41 and a three-way reversing valve housing 42, the three-way reversing valve housing 42 is provided with a first port 421 for communicating with the smoke port 34, a second port 422 for communicating with the dust removing and exhausting assembly 50, and a third port 423 for communicating with the input port of the pressure reducing and buffering assembly 60, the output port of the pressure reducing and buffering assembly 60 is connected with the dust removing and exhausting assembly 50, a reversing cavity is provided in the three-way reversing valve housing 42, and the reversing valve core 41 is movably provided in the reversing cavity for communicating the first port 421 with the second port 422 through the reversing cavity, or for communicating the first port 421 with the third port 423 through the reversing cavity, or for blocking the first port 421.
More preferably, the three-way reversing valve housing 42 is a spherical valve housing, the first port 421, the second port 422 and the third port 423 are positioned on the same radial section of the three-way reversing valve housing 42, and the reversing valve core 41 is rotatably arranged around the spherical center of the three-way reversing valve housing 42 to block the first port 421 or the second port 422 or the third port 423, so that the directional conduction of the flue gas flow direction is realized.
More preferably, the reversing valve core 41 is matched with the inner wall surface of the three-way reversing valve housing 42 in a curved surface fitting mode.
Referring to fig. 1, 7 and 8, further, the pressure reducing buffer assembly 60 includes a pressure reducing valve 61 and a buffer bin 62 sequentially arranged along the air flow direction, a first end of the pressure reducing valve 61 is connected with the smoke reversing assembly 40, a second end of the pressure reducing valve 61 is connected with a first end of the buffer bin 62, and a second end of the buffer bin 62 is connected with the dust removing and exhausting assembly 50. Optionally, in this embodiment, the first end of the pressure relief valve 61 is connected to a second connector of the smoke diverting assembly 40.
It can be understood that by designing the flue gas reversing assembly 40, the pressure reducing valve 61 and the buffer bin 62, the free switching of the flue gas in the two pipelines is realized, which is beneficial to the rapid release of the kiln chamber pressure and the elimination of the impact of the pressure relief process on the dust remover.
Please refer to fig. 7 again, further, relief valve 61 includes a pressure release housing, a relief valve plug and a relief reset spring, a pressure release buffer cavity is provided in the pressure release housing, two ends of the pressure release housing are respectively provided with a pressure release air inlet and a pressure release air outlet which are communicated with the pressure release buffer cavity, the relief valve plug and the relief reset spring are all provided in the pressure release buffer cavity, the relief valve plug is movably provided in the pressure release buffer cavity to enable the pressure release air inlet to be communicated with or isolated from the pressure release buffer cavity, a first end of the relief reset spring is fixedly connected with the relief valve plug, a second end of the relief reset spring is fixedly provided in the pressure release buffer cavity, and the air inflow of the pressure release buffer cavity is controlled by the pressure difference between the pre-pressure of the relief reset spring and the air inflow pressure of the pressure release air inlet. More preferably, the pressure relief vent is arranged flush with the bottom surface of the pressure relief shell. When the smoke reversing device specifically works, after high-pressure smoke enters the pressure reducing valve 61 through the smoke reversing assembly 40, the pressure reducing valve plug moves backwards under the action of front-back pressure difference, a channel is formed between the pressure reducing valve plug and the pressure reducing shell, the higher the pressure is, the larger the backward displacement of the pressure reducing valve plug is, and the larger the fluid area of the high-pressure smoke is; the pressure release return spring is extruded when the pressure release valve plug moves backward, so that the pressure release return spring forms a resistance for resisting the backward movement of the pressure release valve plug, on the other hand, after the pressure release air inlet is communicated with the space of the pressure release shell, the pressure difference between the front and the rear of the pressure release valve plug is correspondingly reduced, the pushing force is reduced, the resistance is increased, and the dynamic balance is kept between the pressure release process and the pressure release process, so that on one hand, high-pressure flue gas is rapidly discharged through the pressure release valve 61, the pressure of the pressure release air inlet is rapidly reduced, and on the other hand, the pressure downstream of the pressure release valve plug is not rapidly increased. In a word, through setting up relief valve 61, can effectively eliminate high-pressure flue gas and diffuse the process and form the shock wave in the low reaches, simultaneously, the pressure release gas vent of pressure release casing flushes with the export, makes the dust that subsides in the relief valve 61 shell, can sweep out the relief valve 61 shell automatically in the pressure release process, reaches the automatically cleaning effect.
Referring to fig. 8 again, further, the buffer bin 62 includes a buffer housing 621, partition plates 622, an ash discharge valve 623 and an ash gun 624, a dust collection buffer cavity is disposed in the buffer housing 621, dust collection air inlets and dust collection air outlets which are communicated with the dust collection buffer cavity are disposed at two sides of the buffer housing 621, the dust collection air inlets are connected with the second ends of the pressure reducing valves 61, the dust collection air outlets are connected with the dust collection air discharging assembly 50, the ash discharge valves 623 and the partition plates 622 are disposed in the dust collection buffer cavity, the ash discharge valves 623 are sequentially arranged along the length direction of the buffer housing 621 and enclose with the bottom of the buffer housing 621 to form an ash bucket, the partition plates 622 are disposed at intervals along the length direction of the buffer housing 621, two adjacent partition plates 622 are staggered along the height direction of the buffer housing 621 to form an S-shaped serpentine dust collection channel in the dust collection buffer cavity, the dust collection air inlets and the dust collection air outlets are communicated through the S-shaped dust collection channel, and the ash discharge valves 623 are disposed at the bottom of the serpentine dust collection channel. It will be appreciated that the partition 622 divides the dust buffer chamber into sub-chambers connected in series with one another to form an S-shaped serpentine dust removal channel along which exhaust gas from the inlet passes sequentially through the chambers and eventually exits the outlet at a further reduced pressure and velocity to completely eliminate the pressure relief process shock wave. The top of each subchamber is provided with an ash removal gun 624, the bottom is provided with an ash discharge valve 623, an ash bucket is arranged below the ash discharge valve 623, and the dust which is deposited by waste gas through the buffer bin 62 passes through the ash removal gun 624, is blown into the lower ash bucket from the ash discharge valve 623, and finally is conveyed away through pneumatic force.
Further, the dust removing and exhausting assembly 50 comprises a dust remover, a dust removing fan and a smoke exhausting chimney which are sequentially arranged along the airflow direction and are mutually communicated, and an air inlet of the dust remover is communicated with the smoke reversing assembly 40 or the decompression buffer assembly 60. Optionally, the air inlet of the dust collector communicates with the second interface 422 through a control conduit.
Further, the cooling air supply assembly 10 includes a cooling fan 11, a cooling air duct 12, a cooling air pressure detector 13, a cooling air cut-off valve 14 and a cooling air short-circuit valve 15, the cooling air duct 12 adopts a three-way pipe, the cooling air duct 12 is used for conveying cooling air flow provided by the cooling fan 11 into a corresponding kiln chamber, the cooling air pressure detector 13 is arranged on the cooling air duct 12 and is used for detecting air flow pressure of the cooling air flow in the cooling air duct 12, the cooling air cut-off valve 14 is arranged on the cooling air duct 12 and is positioned on one side of the cooling air pressure detector 13 close to the kiln chamber, and the cooling air short-circuit valve 15 is arranged on the cooling air duct 12 and is positioned on one side of the cooling air pressure detector 13 close to the cooling fan 11 and is used for refluxing cooling air flow provided by the cooling fan 11 into the cooling fan 11.
Further, the combustion-supporting air supply assembly 20 includes a combustion-supporting fan 21, a combustion-supporting air duct 22, a combustion-supporting air short-circuiting valve 23 and a combustion-supporting air pressure detector 24, the combustion-supporting air duct 22 is used for conveying the combustion-supporting air provided by the combustion-supporting fan 21 into the reversing body 31, the combustion-supporting air pressure detector 24 is arranged on the combustion-supporting air duct 22 for detecting the air flow pressure of the combustion-supporting air in the combustion-supporting air duct 22, and the combustion-supporting air short-circuiting valve 23 is arranged on the combustion-supporting air duct 22 for refluxing the combustion-supporting air flow provided by the combustion-supporting fan 21 into the combustion-supporting fan 21.
The invention also provides a double-chamber lime kiln decompression method without dust leakage, when the double-chamber lime kiln is in a working state, combustion-supporting air is supplied into a combustion-supporting air reversing assembly through a combustion-supporting air supply assembly, cooling air is supplied into a heat storage chamber through a cooling air supply assembly, combustion-supporting air is supplied into a combustion chamber under the guidance of the combustion-supporting air reversing assembly, waste heat flue gas output by the heat storage chamber is conveyed into a flue gas reversing assembly, and the waste heat flue gas is led into a dust removal and exhaust assembly under the guidance of the flue gas reversing assembly and is exhausted through the dust removal and exhaust assembly; in the reversing process of the double-chamber lime kiln, firstly, stopping supplying combustion-supporting air to the combustion-supporting air supply assembly and stopping supplying cooling air to the heat accumulation chamber; then, the combustion chamber and the heat accumulation chamber are communicated through the combustion-supporting air supply assembly, so that high-pressure flue gas in the combustion chamber is conveyed into the heat accumulation chamber to realize primary decompression; then, the combustion chamber is communicated with a first connector of the smoke reversing assembly through the combustion-supporting air supply assembly, at the moment, the first connector of the smoke reversing assembly is communicated with a third connector, and under the matched guiding action of the combustion-supporting air supply assembly and the smoke reversing assembly, high-pressure smoke in the combustion chamber is sequentially discharged to the decompression buffer assembly after passing through the air supply assembly and the smoke reversing assembly; then, after the second-stage decompression is completed in the decompression buffering component, the second-stage decompression is led into the dedusting exhaust component and exhausted through the dedusting exhaust component.
Specifically, when reversing starts, a valve plug of a smoke reversing valve is arranged at a smoke inlet end, so that a passage for smoke to enter a downstream dust removal exhaust assembly is cut off; then a valve plug of a combustion air reversing valve on the combustion chamber is arranged at the inlet end of the combustion air, a cooling air cut-off valve is closed, the combustion air and the cooling air are cut off from entering a kiln passage, and at the moment, high-pressure gas in the combustion chamber enters the micro negative pressure heat accumulation chamber through an exhaust gas pipeline, so that primary pressure reduction is realized; then, the rotating speed of the fan is interlocked with the pressure of the pipeline, the pressure of the pipeline is monitored in real time, and the rotating speed of the fan is adjusted according to the monitored pressure, so that the fan is prevented from being damaged due to the fact that the pressure of the fan is blocked to exceed the maximum value due to the blocking of an outlet; and the piston of the smoke reversing valve is arranged at the second interface and is communicated with the kiln chamber and the decompression buffer assembly, at the moment, the residual pressure of the kiln chamber after primary decompression is impacted to open the decompression valve, the secondary decompression is completed through the decompression valve, and then the pressure and the flow are further reduced after passing through the decompression bin, so that the low pressure and the low pressure required by dust removal are achieved. The low-speed air flow is discharged after being purified by the dust removal and exhaust assembly; when the pressure of the combustion chamber is reduced to normal pressure, the combustion-supporting fan cut-off valve and the cooling fan cut-off valve are opened, and the combustion-supporting air and the cooling air pipeline pressure are released.
The flow of the double-chamber lime kiln system 100 without dust leakage provided by the invention is as follows: before reversing, the combustion air short-circuit valve 23 and the cooling air short-circuit valve are both in a closed state, and the cooling air cut-off valve 14 is in an open state; the combustion-supporting air side of the reversing valve 311 on the combustion chamber is in an open state, the exhaust gas side of the reversing valve 311 on the heat storage chamber is in a closed state, the exhaust gas side of the reversing valve 311 on the heat storage chamber is in an open state, the combustion-supporting air enters the combustion chamber, and the residual heat flue gas in the heat storage chamber is discharged from a kiln top exhaust gas outlet of the heat storage chamber; the port of the smoke reversing assembly 40 connected with the pressure reducing valve 61 is in a closed state, the port of the waste heat smoke directly connected with the dust remover is in an open state, the waste heat smoke is sucked into the dust remover under the pumping force of the dust removing fan, and the waste heat smoke is discharged into the surrounding environment through the smoke discharging chimney after being filtered and removed. When the reversing starts, the reversing valve core 41 of the smoke reversing assembly 40 is firstly arranged at the second interface 422, so that the first interface 421 and the third interface 423 are communicated with each other and the passage of smoke entering the downstream dust remover is cut off; then the combustion chamber is communicated with the heat accumulation chamber, the cooling air cut-off valve 14 is closed, the combustion-supporting air and the cooling air are cut off from entering the kiln passage, and high-pressure gas in the combustion chamber enters the heat accumulation chamber at the moment, so that primary decompression is realized; then, the rotating speed of the fan is interlocked with the pipeline pressure, the pipeline pressure is monitored in real time, and the rotating speed of the fan is correspondingly adjusted, so that the damage caused by the fact that the pressure of the fan exceeds the maximum value due to the blockage of an outlet is prevented; the combustion chamber, the combustion-supporting air reversing assembly 30, the smoke reversing assembly 40 and the pressure reducing valve 61 are communicated, at the moment, after the residual pressure of the kiln chamber is subjected to primary pressure reduction, the pressure reducing valve 61 is opened by impact, the secondary pressure reduction is completed, the pressure and the flow of the gas subjected to pressure reduction are further reduced after the gas passes through the buffer bin 62, so that the low pressure and the low speed required by the dust remover are met, the gas passes through the dust remover, and after the dust removal and purification are completed, the gas is discharged into the surrounding environment from the smoke discharging chimney; when the pressure of the combustion chamber is reduced to normal pressure, a combustion-supporting and cooling air short-circuit valve is opened, and the 12-channel pressure of the combustion-supporting air and the cooling air pipe is released
According to research, in the lime kiln in the prior art, the pressure in the kiln is released through a relief valve which is directly communicated with the atmosphere in the reversing and pressure releasing process, high-pressure gas is sprayed out from the relief valve in the pressure releasing process and can carry a large amount of solid particles, and under the structure of the prior art, the flow rate of waste gas sprayed out from the relief valve is high, the pressure is high, and periodic pulse fluctuation is presented, so that the treatment difficulty is very high, and the treatment is basically in a non-treatment state at present, so that serious environmental pollution is caused. In the double-chamber lime kiln system 100 without dust leakage of the invention, the kiln body provides high-temperature environment required by reaction for lime calcination, and the combustion-supporting fan 21 and the cooling fan 11 are used for providing air required by combustion and cooling for the kiln chamber; the combustion air reversing assembly 30 is used for realizing the reversing of the combustion air and the flue gas between the two kiln bores; the combustion air pressure detector 24 and the combustion air short-circuit valve 23 are used for adjusting the rotating speed of the combustion air fan 21 or opening short circuit when the combustion air entering the kiln channel is cut off, so as to prevent the combustion air fan 21 from holding pressure; the cooling air cut-off valve 14 is used for cutting off a cooling air kiln inlet channel, and the cooling air pressure detector 13 and the short circuit valve are used for adjusting the rotating speed of the combustion-supporting fan 21 or opening the short circuit when cutting off the combustion-supporting air kiln inlet channel so as to prevent the combustion-supporting fan 21 from suppressing pressure; the flue gas reversing component 40 is used for cutting off a flue gas kiln outlet passage (before decompression begins), controlling the flue gas to be directly connected with a dust remover (in a calcination period), or controlling the flue gas advanced pressure reducing valve 61 (in a reversing period); the pressure reducing valve 61 is used for rapidly reducing the impact pressure of the hearth in the pressure relief process, the surge bin 62 is used for rapidly dissipating the impact after pressure relief, so that the excessive flow rate of the flue gas entering the main body dust remover is prevented, the problem that high-concentration dust and waste gas are discharged outside the pressure relief valve in the pressure relief process can be solved, the problem that the dust discharged by the lime kiln in an unorganized manner exceeds the standard is solved, and the clean production of the lime kiln is realized.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A double-chamber lime kiln system without dust leakage is characterized in that,
comprises a cooling air supply assembly, a combustion-supporting air reversing assembly, a flue gas reversing assembly, a dust removal and exhaust assembly, a decompression buffer assembly and a double-hearth kiln body with two kiln hearths,
the cooling air supply assembly is used for supplying cooling air into the kiln chamber from the bottom of the kiln chamber,
the combustion-supporting air supply assembly is used for supplying combustion-supporting air into the combustion-supporting air reversing assembly,
the combustion-supporting air reversing assembly is used for conveying combustion-supporting air into one of the kiln bores and conveying waste heat flue gas in the other kiln bore into the flue gas reversing assembly, or the combustion-supporting air reversing assembly is used for communicating two kiln bores so that high-pressure flue gas in one kiln bore is conveyed into the other kiln bore, or the combustion-supporting air reversing assembly is used for conveying high-pressure flue gas in the kiln bore into the flue gas reversing assembly,
The flue gas reversing assembly is used for guiding the waste heat flue gas output by the combustion-supporting air reversing assembly into the dust removal exhaust assembly, or the flue gas reversing assembly is used for guiding the high-pressure flue gas output by the combustion-supporting air reversing assembly into the decompression buffer assembly for depressurization and then outputting the high-pressure flue gas into the dust removal exhaust assembly.
2. A dual chamber lime kiln system without dust leakage as claimed in claim 1, wherein,
the combustion-supporting air reversing assembly comprises a reversing body, two hearth interfaces arranged on the reversing body, a combustion-supporting air interface arranged on the reversing body and used for being communicated with the combustion-supporting air supply assembly, and a smoke interface arranged on the reversing body and used for being communicated with the smoke reversing assembly, the hearth interfaces and the kiln hearth are arranged in one-to-one correspondence,
the reversing body is adjusted to enable combustion-supporting air provided by the combustion-supporting air supply assembly to be conveyed into one kiln chamber, waste heat flue gas in the heat storage chamber of the other kiln chamber is conveyed into the flue gas reversing assembly, or the two kiln chambers are communicated to enable high-pressure flue gas in one kiln chamber to be conveyed into the other kiln chamber, or high-pressure flue gas in the kiln chamber is conveyed into the flue gas reversing assembly.
3. A double-chamber lime kiln system without dust leakage as claimed in claim 2, wherein,
the reversing body comprises two reversing valves which are mutually communicated through an air return pipe, each reversing valve comprises a reversing valve plug and a three-way reversing valve body extending along the length direction, each three-way reversing valve body is respectively provided with a flue gas interface, a combustion-supporting air interface and a hearth interface, the combustion-supporting air interfaces of the two three-way reversing valve bodies are communicated through the air return pipe,
the three-way reversing valve body is internally provided with a reversing cavity, the reversing valve plug is movably arranged in the reversing cavity for communicating the hearth interface with the flue gas interface through the reversing cavity or communicating the hearth interface with the combustion air interface through the reversing cavity,
the combustion-supporting air interface is arranged at the upper part of the three-way reversing valve body and is used for blowing combustion-supporting air downwards from the upper part of the three-way reversing valve body,
the hearth interface is arranged at the lateral direction of the three-way reversing valve body, and the cavity bottom surface of the hearth interface is flush with the cavity bottom surface of the reversing cavity.
4. A non-dusting, leakage double-chamber lime kiln system according to claim 2 or 3,
The smoke reversing assembly comprises a reversing valve core and a three-way reversing valve shell, a first interface communicated with the smoke interface, a second interface communicated with the dedusting exhaust assembly and a third interface communicated with the input port of the decompression buffering assembly are arranged on the three-way reversing valve shell, the output port of the decompression buffering assembly is connected with the dedusting exhaust assembly, a reversing cavity is arranged in the three-way reversing valve shell,
the reversing valve core is movably arranged in the reversing cavity and used for enabling the first interface to be communicated with the second interface through the reversing cavity, or enabling the first interface to be communicated with the third interface through the reversing cavity, or blocking the first interface.
5. A double-chamber lime kiln system without dust leakage as claimed in claim 2, wherein,
the decompression buffering assembly comprises decompression valves and buffering bins which are sequentially arranged along the airflow direction, the first ends of the decompression valves are connected with the smoke reversing assembly, the second ends of the decompression valves are connected with the first ends of the buffering bins, and the second ends of the buffering bins are connected with the dust removal exhaust assembly.
6. The double-chamber lime kiln system without dust leakage of claim 5,
the pressure reducing valve comprises a pressure reducing shell, a pressure reducing valve plug and a pressure reducing reset spring, a pressure reducing buffer cavity is arranged in the pressure reducing shell, a pressure reducing air inlet and a pressure reducing air outlet which are communicated with the pressure reducing buffer cavity are respectively arranged at two ends of the pressure reducing shell,
the pressure relief valve plug and the pressure relief reset spring are both arranged in the pressure relief buffer cavity, the pressure relief valve plug is movably arranged in the pressure relief buffer cavity so as to enable the pressure relief air inlet to be communicated or separated from the pressure relief buffer cavity,
the first end of the pressure relief reset spring is fixedly connected with the pressure relief valve plug, the second end of the pressure relief reset spring is fixedly arranged in the pressure relief buffer cavity, and the air inflow of the pressure relief buffer cavity is controlled to enter from the pressure relief air inlet through the pre-pressure of the pressure relief reset spring and the pressure difference of the air inlet pressure of the pressure relief air inlet.
7. The double-chamber lime kiln system without dust leakage of claim 5,
the buffer bin comprises a buffer shell, a partition plate, an ash discharge valve and an ash removal gun, a dust removal buffer cavity is arranged in the buffer shell, a dust removal air inlet and a dust removal air outlet which are communicated with the dust removal buffer cavity are respectively arranged at two sides of the buffer shell, the dust removal air inlet is connected with the second end of the pressure reduction valve, the dust removal air outlet is connected with the dust removal air exhaust assembly,
The dust discharging valves and the partition plates are arranged in the dust removing buffer cavity, the dust discharging valves are sequentially arranged along the length direction of the buffer shell and are enclosed with the bottom of the buffer shell to form a dust hopper,
a plurality of partition plates are arranged at intervals along the length direction of the buffer shell, two adjacent partition plates are arranged in a staggered manner along the height direction of the buffer shell so as to form an S-shaped serpentine dust removing channel in the dust removing buffer cavity,
the dust removal air inlet is communicated with the dust removal air outlet through the S-shaped serpentine dust removal channel, and the dust discharge valve is arranged at the bottom of the S-shaped serpentine dust removal channel.
8. A double-chamber lime kiln system without dust leakage as claimed in claim 2, wherein,
the dust removal exhaust assembly comprises dust collectors, dust removal fans and a smoke exhaust chimney which are sequentially arranged along the airflow direction and are mutually communicated, and an air inlet of the dust collectors is respectively connected with the smoke reversing assembly and the decompression buffer assembly.
9. A double-chamber lime kiln system without dust leakage as claimed in claim 2, wherein,
the cooling air supply assembly comprises a cooling fan, a cooling air pipe, a cooling air pressure detector, a cooling air cut-off valve and a cooling air short-circuit valve,
The cooling air pipe adopts the three-way pipe, the cooling air pipe is used for carrying the cooling air current that cooling fan provided to correspond in the kiln bore, the cooling air pressure detector is located on the cooling air pipe be used for detecting the air current pressure of the cooling air current in the cooling air pipe, the cooling air trip valve is located on the cooling air pipe and be in the cooling air pressure detector is close to one side of kiln bore, the cooling air short-circuit valve is located on the cooling air pipe and be in the cooling air pressure detector is close to one side of cooling fan, be used for with the cooling air current that cooling fan provided flows back to in the cooling fan.
10. A method for relieving pressure of a double-chamber lime kiln without dust leakage is characterized by comprising the following steps:
when the double-hearth lime kiln is in a working state, combustion-supporting air is supplied into the combustion-supporting air reversing assembly through the combustion-supporting air supply assembly, cooling air is supplied into the heat accumulation hearth through the cooling air supply assembly, the combustion-supporting air is supplied into the combustion hearth under the guidance of the combustion-supporting air reversing assembly, waste heat flue gas output by the heat accumulation hearth is conveyed into the flue gas reversing assembly, and the waste heat flue gas is led into the dust removal exhaust assembly under the guidance of the flue gas reversing assembly and is exhausted through the dust removal exhaust assembly;
In the reversing process of the double-chamber lime kiln, firstly, stopping supplying combustion-supporting air to the combustion-supporting air supply assembly and stopping supplying cooling air to the heat accumulation chamber; then, the combustion chamber and the heat accumulation chamber are communicated through the combustion-supporting air supply assembly, so that high-pressure flue gas in the combustion chamber is conveyed into the heat accumulation chamber to realize primary decompression; then, the combustion chamber is communicated with a first connector of the smoke reversing assembly through the combustion-supporting air supply assembly, at the moment, the first connector of the smoke reversing assembly is communicated with a third connector, and under the matched guiding action of the combustion-supporting air supply assembly and the smoke reversing assembly, high-pressure smoke in the combustion chamber is sequentially discharged to the decompression buffer assembly after passing through the air supply assembly and the smoke reversing assembly; then, after the second-stage decompression is completed in the decompression buffering component, the second-stage decompression is led into the dedusting exhaust component and exhausted through the dedusting exhaust component.
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