CN214892659U - Dust removal device system for flue gas of rotary kiln - Google Patents
Dust removal device system for flue gas of rotary kiln Download PDFInfo
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- CN214892659U CN214892659U CN202121270353.5U CN202121270353U CN214892659U CN 214892659 U CN214892659 U CN 214892659U CN 202121270353 U CN202121270353 U CN 202121270353U CN 214892659 U CN214892659 U CN 214892659U
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Abstract
The utility model provides a dust removal device system for flue gas of a rotary kiln, which comprises a first heat exchanger, a sintering device, a dust removal device, a waste heat boiler, a desulfurization and denitrification device, a second heat exchanger and a chimney; the sintering raw material exchanges heat through a first heat exchanger and flows into a sintering device; and sintering flue gas generated by the sintering device flows through the second heat exchanger, the dust removal device waste heat boiler, the desulfurization and denitrification device and the second heat exchanger in sequence and then is directly discharged into a chimney. Furthermore, the sintering flue gas can be used as a heat source of the first heat exchanger to preheat a sintering material of the sintering device, so that the consumption of raw materials during sintering is reduced. Dust collector system not only can carry out rational utilization to the heat of flue gas, can also avoid the influence of high temperature to the dust collecting equipment life-span.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection, a flue gas processing apparatus system is related to, especially relate to a dust collector system of rotary kiln flue gas.
Background
The industries such as cement, lime and the like adopt a rotary kiln to calcine materials, and are dispersed pollution emission sources. The rotary kiln smoke treatment is always concerned and is a control difficulty accepted by the current environmental protection industry. The flue gas of the rotary kiln contains oxysulfide and nitric oxide, and if the sulfur oxide and nitric oxide are directly discharged to the atmosphere, the flue gas can cause great harm to the environment, and the flue gas in the rotary kiln has large dust content, so that the flue gas has serious negative influence on the denitration catalyst.
CN 107233790A discloses a flue gas denitration method and a system of a rotary kiln, wherein the system comprises a reducing agent preparing and conveying device, a raw material paddle storing and conveying device, a mixing device, a feeding device and the rotary kiln; the reducing agent preparing and conveying device and the raw material paddle storing and conveying device are respectively connected with the mixing device; the mixing device is connected with the rotary kiln through the feeding device. The method comprises the following steps: and mixing and stirring the raw material paddle and the reducing agent solution to form a mixed solution, and spraying the mixed solution into the rotary kiln for heating to realize denitration of the rotary kiln flue gas. The denitration method and the denitration device add the reducing agent into the rotary kiln to carry out denitration, are not beneficial to the combustion stability of the rotary kiln, and improve the combustion cost of the rotary kiln.
CN 208436530U discloses rotary kiln flue gas denitrification facility, including the rotary kiln, still include: the dust remover comprises a plurality of dust removers connected with the rotary kiln, wherein each dust remover is sequentially connected along the smoke circulation direction; the denitration reactor is connected with the rotary kiln, at least one dust remover is connected between the denitration reactor and the rotary kiln, and material return channels connected with the rotary kiln are arranged at the bottoms of the denitration reactor and the dust removers. The rotary kiln flue gas denitration device is characterized in that at least one dust remover is connected between the denitration reactor and the rotary kiln, so that the dust content in flue gas is greatly reduced, the requirement on the dust content in the flue gas during denitration treatment is met, and the problem that the denitration catalyst fails due to overhigh dust content is solved. However, the rotary kiln flue gas denitration device does not consider the influence of the dust content of the rotary kiln flue gas on the dust removal device.
CN 210814723U discloses a cement kiln high temperature dust removal SOx/NOx control device, cement kiln flue gas gets into the decomposition kiln from the rotary kiln and arrives the preheater again, flue gas after coming out from the preheater removes dust through the dust remover, flue gas after the dust removal gets into high temperature SCR denitrification facility after the ammonia that pipeline and ammonia evaporator came out mixes, under the catalytic action of catalyst, ammonia and the nitrogen oxide in the flue gas take place a series of chemical reaction, generate nitrogen gas and vapor, get into the exhaust-heat boiler behind the denitration main fan, carry to desulphurization unit by high temperature fan again, flue gas after the desulfurization is accomplished is directly arranged in the chimney behind the kiln tail dust remover.
The rotary kiln flue gas has high temperature and high dust content, and cannot be directly used for heat recovery devices such as preheating and the like, so that the rotary kiln flue gas needs to be dedusted. However, dust removing devices such as bag-type dust collectors and the like cannot stably operate for a long time at high temperature. In view of the above, it is desirable to provide a system for dedusting flue gas from a rotary kiln, which can operate stably for a long time and has a small heat loss.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a dust removal device system for flue gas of a rotary kiln, which can fully utilize the heat of sintering flue gas, simultaneously avoid the phenomenon of white fog discharged by a chimney and realize the effect of white elimination; meanwhile, the cooling flue gas subjected to heat utilization is dedusted, and the influence of high temperature on the service life of dedusting equipment is avoided.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a dust collector system of rotary kiln flue gas, the dust collector system includes first heat exchanger, sintering device, dust collector, exhaust-heat boiler, SOx/NOx control device, second heat exchanger and chimney.
The sintering raw material exchanges heat through the first heat exchanger and flows into the sintering device.
And sintering flue gas generated by the sintering device flows through the second heat exchanger, the dust removal device, the waste heat boiler, the desulfurization and denitrification device and the second heat exchanger in sequence and then is directly discharged into a chimney.
The sintering material exchanges heat in the first heat exchanger, so that the preheating of the sintering material is realized, and the fuel consumption during sintering is reduced.
The utility model discloses the sintering flue gas that utilizes sintering device to produce heaies up the flue gas after SOx/NOx control as the heat source of second heat exchanger, has avoided in the chimney flue gas temperature to hang down "white fog" phenomenon that causes excessively. The flue gas after the cooling flows into the dust collector to carry out dust removal treatment, and the adverse effect of high temperature on the service life of the dust collector is avoided.
Preferably, the dust removal device comprises a cyclone or a bag-type dust collector.
Preferably, the first heat exchanger is a gas-solid heat exchanger.
The utility model discloses do not specifically prescribe to the model of gas-solid heat exchanger, as long as can realize the preheating to the sintering material can.
Preferably, the second heat exchanger comprises a tube and tube heat exchanger or a plate heat exchanger.
Preferably, the sintering flue gas generated by the sintering device is divided into two streams, and one stream flows through the first heat exchanger, the dust removal device, the waste heat boiler, the desulfurization and denitrification device and the second heat exchanger in sequence and then is directly discharged into a chimney; and the other strand of the flue gas flows through the second heat exchanger, the dust removal device waste heat boiler, the desulfurization and denitrification device and the second heat exchanger in sequence and then is directly discharged into a chimney.
As the preferred technical scheme of the utility model, the heat source of first heat exchanger is the sintering flue gas that sintering device produced, has reduced the consumption of external heat source.
Preferably, the dust collector system further comprises a condensing device.
The condensing device is arranged between the desulfurization and denitrification device and the second heat exchanger.
The utility model, through the arrangement of the condensing device, makes the desulfurization and denitrification flue gas condense through cooling, and reduces the water content in the flue gas; and then the temperature is raised through the second heat exchanger, so that the probability of white fog in the chimney is reduced, and the corrosion of acid fog to the chimney is avoided.
SOx/NOx control device is the conventional SOx/NOx control device in this area, as long as can realize the SOx/NOx control of flue gas can, the utility model discloses do not specifically prescribe a limit.
Condensing equipment is the conventional condensing equipment in this field, as long as can realize the cooling condensation of flue gas can, the utility model discloses do not specifically prescribe a limit to.
Preferably, along the axial direction of the chimney, annular heat exchange jackets are arranged at intervals in the chimney.
The utility model discloses a setting up annular heat transfer at the interval in the chimney and pressing from both sides the cover, utilizing annular heat transfer to press from both sides the flue gas that the cover made in the chimney and maintaining at higher temperature, further improved the effect of "disappearing white".
Preferably, the annular heat exchange jacket is arranged to protrude from the inner wall of the chimney.
The utility model discloses make annular heat transfer press from both sides the cover outstanding the inner wall setting of chimney can improve the heat transfer effect that annular heat transfer pressed from both sides cover and flue gas.
Preferably, the bottom surface of the annular heat exchange jacket is at an angle of 5-10 ° to the bottom surface of the chimney, for example, 5 °, 6 °, 7 °, 8 °, 9 ° or 10 °, but not limited to the values listed, and other values not listed in the range of values are equally applicable.
Preferably, the distance between adjacent annular heat exchange jackets is 10-20% of the chimney body height, for example 10%, 12%, 15%, 16%, 18% or 20%, but not limited to the values recited, and other values not recited in the range of values are equally applicable.
The number of annular heat exchange jackets is from 3 to 6, and may be, for example, 3, 4, 5 or 6, but is not limited to the values recited, and other values not recited within the numerical range are equally applicable.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model utilizes the sintering flue gas generated by the sintering device as the heat source of the second heat exchanger to heat the flue gas after desulfurization and denitrification, thereby avoiding the phenomenon of 'white fog' caused by the over-low temperature of the flue gas in the chimney;
(2) the flue gas flowing through the second heat exchanger flows into a dust removal device for dust removal treatment, so that the adverse effect of high temperature on the service life of the dust removal device is avoided;
(3) the utility model makes the heat source of the first heat exchanger be the sintering flue gas generated by the sintering device, thus reducing the consumption of external heat source;
(4) the utility model, through the arrangement of the condensing device, makes the desulfurization and denitrification flue gas condense through cooling, and reduces the water content in the flue gas; and then the temperature is raised through the second heat exchanger, so that the probability of white fog in the chimney is reduced, and the corrosion of acid fog to the chimney is avoided.
Drawings
Fig. 1 is a schematic structural diagram of a dust removal device system for flue gas of a rotary kiln provided in embodiment 2;
fig. 2 is a schematic structural diagram of a dust removal device system for flue gas of a rotary kiln provided in embodiment 3.
Wherein: 1, a first heat exchanger; 2, a sintering device; 3, a dust removal device; 4, a waste heat boiler; 5, a desulfurization and denitrification device; 6, a second heat exchanger; 7, a chimney; and 8, a condensing device.
Detailed Description
It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Example 1
The embodiment provides a dust collector system of rotary kiln flue gas, the dust collector system includes first heat exchanger 1, sintering device 2, dust collector 3, exhaust-heat boiler 4, SOx/NOx control device 5, second heat exchanger 6 and chimney 7.
The sintering raw material exchanges heat through the first heat exchanger 1 and flows into the sintering device 2;
and sintering flue gas generated by the sintering device 2 sequentially flows through the second heat exchanger 6, the dust removal device 3, the waste heat boiler 4, the desulfurization and denitrification device 5 and the second heat exchanger 6, and then is directly discharged into a chimney 7.
The dust removing device 3 is a bag-type dust remover.
The first heat exchanger 1 is a gas-solid heat exchanger.
The second heat exchanger 6 is a tubular heat exchanger.
In the embodiment, the sintering flue gas generated by the sintering device 2 is used as a heat source of the second heat exchanger 6 to heat the desulfurized and denitrated flue gas, so that the phenomenon of 'white fog' caused by too low flue gas temperature in the chimney 7 is avoided; the flue gas flowing through the second heat exchanger 6 flows into the dust removal device 3 for dust removal treatment, so that the adverse effect of high temperature on the service life of the dust removal device 3 is avoided.
Example 2
The embodiment provides a dust removal device system for flue gas of a rotary kiln as shown in fig. 1, and the dust removal device system comprises a first heat exchanger 1, a sintering device 2, a dust removal device 3, a waste heat boiler 4, a desulfurization and denitrification device 5, a second heat exchanger 6 and a chimney 7.
The sintering raw material exchanges heat through the first heat exchanger 1 and flows into the sintering device 2;
the sintering flue gas generated by the sintering device 2 is divided into two strands, and one strand of the sintering flue gas flows through the first heat exchanger 1, the dust removal device 3, the waste heat boiler 4, the desulfurization and denitrification device 5 and the second heat exchanger 6 in sequence and then is directly discharged into a chimney 7; one strand of the flue gas flows through a second heat exchanger 6, a dust removal device 3, a waste heat boiler 4, a desulfurization and denitrification device 5 and the second heat exchanger 6 in sequence and then is directly discharged into a chimney 7.
The dust removing device 3 is a cyclone separator.
The first heat exchanger 1 is a gas-solid heat exchanger.
The second heat exchanger 6 is a plate heat exchanger.
In the embodiment, the sintering flue gas generated by the sintering device 2 is used as a heat source of the second heat exchanger 6 to heat the desulfurized and denitrated flue gas, so that the phenomenon of 'white fog' caused by too low flue gas temperature in the chimney 7 is avoided; the flue gas flowing through the second heat exchanger 6 flows into the dust removal device 3 for dust removal treatment, so that the adverse effect of high temperature on the service life of the dust removal device 3 is avoided.
Compared with the embodiment 1, the heat source of the first heat exchanger 1 in the embodiment is sintering flue gas generated by the sintering device 2, and consumption of an external heat source is reduced.
Example 3
The embodiment provides a dust removal device system for flue gas of a rotary kiln as shown in fig. 2, and the dust removal device system comprises a first heat exchanger 1, a sintering device 2, a dust removal device 3, a waste heat boiler 4, a desulfurization and denitrification device 5, a second heat exchanger 6 and a chimney 7.
The sintering raw material exchanges heat through the first heat exchanger 1 and flows into the sintering device 2;
the sintering flue gas generated by the sintering device 2 is divided into two strands, and one strand of the sintering flue gas flows through the first heat exchanger 1, the dust removal device 3, the waste heat boiler 4, the desulfurization and denitrification device 5 and the second heat exchanger 6 in sequence and then is directly discharged into a chimney 7; one strand of the flue gas flows through a second heat exchanger 6, a dust removal device 3, a waste heat boiler 4, a desulfurization and denitrification device 5 and the second heat exchanger 6 in sequence and then is directly discharged into a chimney 7.
The dust removing device 3 is a bag-type dust remover.
The first heat exchanger 1 is a gas-solid heat exchanger.
The second heat exchanger 6 is a tubular heat exchanger.
The dust removal device system further comprises a condensing device 8; the condensing device 8 is arranged between the desulfurization and denitrification device 5 and the second heat exchanger 6.
In the embodiment, the sintering flue gas generated by the sintering device 2 is used as a heat source of the second heat exchanger 6 to heat the desulfurized and denitrated flue gas, so that the phenomenon of 'white fog' caused by too low flue gas temperature in the chimney 7 is avoided; the flue gas flowing through the second heat exchanger 6 flows into the dust removal device 3 for dust removal treatment, so that the adverse effect of high temperature on the service life of the dust removal device 3 is avoided.
In the embodiment, the condensing device 8 is arranged, so that the desulfurized and denitrated flue gas is condensed by cooling, and the water content in the flue gas is reduced; and then, the temperature is raised through the second heat exchanger 6, so that the probability of white fog in the chimney 7 is reduced, and the corrosion of acid fog to the chimney 7 is avoided.
Example 4
The embodiment provides a dust collector system of rotary kiln flue gas, the dust collector system includes first heat exchanger 1, sintering device 2, dust collector 3, exhaust-heat boiler 4, SOx/NOx control device 5, second heat exchanger 6 and chimney 7.
The sintering raw material exchanges heat through the first heat exchanger 1 and flows into the sintering device 2.
The sintering flue gas generated by the sintering device 2 is divided into two strands, and one strand of the sintering flue gas flows through the first heat exchanger 1, the dust removal device 3, the waste heat boiler 4, the desulfurization and denitrification device 5 and the second heat exchanger 6 in sequence and then is directly discharged into a chimney 7; one strand of the waste heat energy-saving flue gas flows through a second heat exchanger 6, a dust removal device 3, a waste heat boiler 4, a desulfurization and denitrification device 5 and the second heat exchanger 6 in sequence and then is directly discharged into a chimney 7.
The dust removing device 3 is a cyclone separator.
The first heat exchanger 1 is a gas-solid heat exchanger.
The second heat exchanger 6 is a plate heat exchanger.
Along the axial direction of the chimney 7, annular heat exchange jackets are arranged in the chimney 7 at intervals, and the annular heat exchange jackets are arranged to protrude out of the inner wall of the chimney 7; the bottom surface of the annular heat exchange jacket and the bottom surface of the chimney 7 form an included angle of 5 degrees; the distance between the adjacent annular heat exchange jackets is 10% of the height of the chimney 7 body; the number of the annular heat exchange jackets is 6.
Compared with the embodiment 2, in the embodiment, the annular heat exchange jackets are arranged in the chimney 7 at intervals, and the flue gas in the chimney 7 is maintained at a higher temperature by using the annular heat exchange jackets, so that the effect of white elimination is further improved.
Example 5
The embodiment provides a dust collector system of rotary kiln flue gas, the dust collector system includes first heat exchanger 1, sintering device 2, dust collector 3, exhaust-heat boiler 4, SOx/NOx control device 5, second heat exchanger 6 and chimney 7.
The sintering raw material exchanges heat through the first heat exchanger 1 and flows into the sintering device 2.
The sintering flue gas generated by the sintering device 2 is divided into two strands, and one strand of the sintering flue gas flows through the first heat exchanger 1, the dust removal device 3, the waste heat boiler 4, the desulfurization and denitrification device 5 and the second heat exchanger 6 in sequence and then is directly discharged into a chimney 7; one strand of the waste heat energy-saving flue gas flows through a second heat exchanger 6, a dust removal device 3, a waste heat boiler 4, a desulfurization and denitrification device 5 and the second heat exchanger 6 in sequence and then is directly discharged into a chimney 7.
The dust removing device 3 is a bag-type dust remover.
The first heat exchanger 1 is a gas-solid heat exchanger.
The second heat exchanger 6 is a tubular heat exchanger.
The dust removal device system further comprises a condensing device 8; the condensing device 8 is arranged between the desulfurization and denitrification device 5 and the second heat exchanger 6.
Along the axial direction of the chimney 7, annular heat exchange jackets are arranged in the chimney 7 at intervals, and the annular heat exchange jackets are arranged to protrude out of the inner wall of the chimney 7; the included angle between the bottom surface of the annular heat exchange jacket and the bottom surface of the chimney 7 is 10 degrees; the distance between the adjacent annular heat exchange jackets is 20% of the height of the chimney 7 body; the number of the annular heat exchange jackets is 3.
Compared with the embodiment 3, in the embodiment, the annular heat exchange jackets are arranged in the chimney 7 at intervals, and the flue gas in the chimney 7 is maintained at a higher temperature by using the annular heat exchange jackets, so that the effect of white elimination is further improved.
In summary, the utility model utilizes the sintering flue gas generated by the sintering device as the heat source of the second heat exchanger to heat the flue gas after desulfurization and denitrification, thereby avoiding the phenomenon of 'white fog' caused by too low flue gas temperature in the chimney; the flue gas flowing through the second heat exchanger flows into a dust removal device for dust removal treatment, so that the adverse effect of high temperature on the service life of the dust removal device is avoided; the utility model makes the heat source of the first heat exchanger be the sintering flue gas generated by the sintering device, thus reducing the consumption of external heat source; the utility model, through the arrangement of the condensing device, makes the desulfurization and denitrification flue gas condense through cooling, and reduces the water content in the flue gas; and then the temperature is raised through the second heat exchanger, so that the probability of white fog in the chimney is reduced, and the corrosion of acid fog to the chimney is avoided.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (10)
1. A dust removal device system for rotary kiln flue gas is characterized by comprising a first heat exchanger, a sintering device, a dust removal device, a waste heat boiler, a desulfurization and denitrification device, a second heat exchanger and a chimney;
the sintering raw material exchanges heat through a first heat exchanger and flows into a sintering device;
and sintering flue gas generated by the sintering device flows through the second heat exchanger, the dust removal device, the waste heat boiler, the desulfurization and denitrification device and the second heat exchanger in sequence and then is directly discharged into a chimney.
2. The dust collector system of claim 1 wherein the dust collector comprises a cyclone or a bag-type dust collector.
3. The dust collector system of claim 1 wherein the first heat exchanger is a gas-solid heat exchanger.
4. A dust extraction system according to claim 1 or 3, wherein the second heat exchanger comprises a tube and tube heat exchanger or a plate heat exchanger.
5. The dust removal device system of claim 1, wherein the sintering flue gas generated by the sintering device is divided into two streams, and one stream is directly discharged into a chimney after sequentially passing through the first heat exchanger, the dust removal device, the waste heat boiler, the desulfurization and denitrification device and the second heat exchanger; and the other strand of the flue gas flows through the second heat exchanger, the dust removal device waste heat boiler, the desulfurization and denitrification device and the second heat exchanger in sequence and then is directly discharged into a chimney.
6. The dust collector system of claim 1, further comprising a condensing device;
the condensing device is arranged between the desulfurization and denitrification device and the second heat exchanger.
7. The dust collector system of claim 1, wherein an annular heat exchange jacket is spaced within the chimney in the axial direction of the chimney.
8. The dust collector system of claim 7, wherein the annular heat exchange jacket is disposed to protrude from an inner wall of the chimney.
9. A dust collector system according to claim 7 or 8, wherein the bottom surface of the annular heat exchange jacket forms an angle of 5-10 ° with the bottom surface of the chimney.
10. The dust collector system of claim 9, wherein the distance between adjacent annular heat exchange jackets is 10-20% of the height of the chimney body;
the number of the annular heat exchange jackets is 3-6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121270353.5U CN214892659U (en) | 2021-06-08 | 2021-06-08 | Dust removal device system for flue gas of rotary kiln |
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| CN202121270353.5U CN214892659U (en) | 2021-06-08 | 2021-06-08 | Dust removal device system for flue gas of rotary kiln |
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