CN215692401U - Rotary hearth furnace flue gas denitration system - Google Patents
Rotary hearth furnace flue gas denitration system Download PDFInfo
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- CN215692401U CN215692401U CN202122198194.9U CN202122198194U CN215692401U CN 215692401 U CN215692401 U CN 215692401U CN 202122198194 U CN202122198194 U CN 202122198194U CN 215692401 U CN215692401 U CN 215692401U
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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
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Abstract
The utility model provides a rotary hearth furnace flue gas denitration system which comprises a rotary hearth furnace, a gravity settling chamber, a waste heat boiler, a cyclone dust collector, a bag-type dust collector, an induced draft fan, a silencer and a chimney. The barrel body of the gravity settling chamber is provided with a spray gun device. The gravity settling chamber and the inner wall of the pipeline from the gravity settling chamber to the waste heat boiler are wrapped with heat insulating materials. A gravity settling chamber is arranged in front of the waste heat boiler, so that the deposition of dust in the flue gas on the waste heat boiler can be reduced. The spray gun device is arranged on the barrel body of the gravity settling chamber, ammonia water or urea solution is sprayed into the barrel body through the spray gun device to achieve the aim of denitration, and the urea solution or the ammonia water can be ensured to contact with NOx in the smoke of the rotary hearth furnace to react under the optimal temperature condition of reaction. The gravity settling chamber and the inner wall of the flue from the gravity settling chamber to the waste heat boiler are wrapped by heat insulating materials, so that the reaction time of the spray gun is prolonged, the reaction rate of the spray gun is improved, and the aim of denitration of the flue gas of the rotary hearth furnace is fulfilled at low cost.
Description
Technical Field
The utility model belongs to the technical field of mechanical equipment, and particularly relates to a rotary hearth furnace flue gas denitration system.
Background
The current disposal mode of the dust and mud containing iron and zinc is mainly iron making self circulation, and part of the dust and mud is stockpiled in a factory or sold outside the factory. Along with the stricter environmental protection requirement at present, the iron-containing and zinc-containing dust which can be transported and disposed originally can not be treated according to the original mode, if the part of dust and mud directly returns to the iron front system, because of the high content of harmful impurities such as zinc, etc., the damage of the blast furnace lining, the nodulation in the furnace, the corrosion of the gas pipeline, etc. can be caused, and the smooth operation and the service life of the blast furnace production are seriously influenced. Therefore, how to reasonably recycle the iron-containing and zinc-containing dust needs to open up a new way.
The rotary hearth furnace technology can realize effective cyclic utilization of metallurgical iron-containing dust and sludge solid waste, and metallized products produced by the rotary hearth furnace can be used by a blast furnace and a converter, so that iron, carbon and zinc resources in the metallized products can be comprehensively recovered, the resources can be recycled, and the environmental protection requirement can be met. Can obtain good environmental benefit and social benefit.
Along with the requirement of ultralow emission of atmospheric pollutants in the steel industry, the requirement on the emission index of the flue gas at the outlet of the rotary hearth furnace is stricter, and the flue gas which is not subjected to denitration treatment can not meet the emission requirement any more, so that the search for a low-cost denitration technology is urgent.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present invention provides a flue gas denitration system for a rotary hearth furnace.
In order to achieve the purpose, the technical scheme adopted by the utility model for solving the technical problems is as follows:
a rotary hearth furnace flue gas denitration system comprises a rotary hearth furnace, a gravity settling chamber, a waste heat boiler, a dust removal device, an induced draft fan and a flue gas discharge pipeline; the rotary hearth furnace outlet flue gas is connected to the inlet of the gravity settling chamber through a pipeline, the outlet flue gas of the gravity settling chamber is connected to the inlet of the waste heat boiler through a pipeline, the outlet flue gas of the waste heat boiler is connected to the dust removal device through a pipeline, the outlet flue gas of the dust removal device is connected to the inlet of the draught fan through a pipeline, and the flue gas is discharged through a flue gas discharge pipeline after being pressurized by the draught fan. The cylinder body of the gravity settling chamber is connected with a plurality of spray gun devices, urea solution or ammonia water is sprayed by the spray gun devices to react with NOx in the flue gas in the gravity settling chamber, and the aim of denitration is fulfilled.
In the rotary hearth furnace flue gas denitration system, the gravity settling chamber and the inner wall of the pipeline from the gravity settling chamber to the waste heat boiler are wrapped with heat insulating materials. The heat insulating material may be one of the prior art.
The rotary hearth furnace flue gas denitration system comprises a cyclone dust collector.
Foretell rotary hearth furnace flue gas denitration system, dust collector still includes the sack cleaner, and exhaust-heat boiler export flue gas passes through the pipe connection to the cyclone entry, and the cyclone exports the flue gas and passes through the pipe connection to sack cleaner entry, and sack cleaner export flue gas passes through the pipe connection to the draught fan entry.
In the rotary hearth furnace flue gas denitration system, the flue gas exhaust pipeline is a chimney.
The silencer is connected between the induced draft fan and the flue gas discharge pipeline, and the flue gas is pressurized by the induced draft fan, silenced by the silencer and discharged by the flue gas discharge pipeline. The muffler is made of a pipe filled with a sound deadening material.
The rotary hearth furnace flue gas denitration system further comprises an ammonia water or urea solution storage device, and the spray gun device is communicated with the ammonia water or urea solution storage device.
The utility model has the beneficial effects that:
the gravity settling chamber is arranged at the front section of the waste heat boiler, so that the deposition of dust in the flue gas on the waste heat boiler can be reduced.
Secondly, a spray gun device is arranged on the barrel body of the gravity settling chamber, ammonia water or urea solution is sprayed into the barrel body through the spray gun device to achieve the aim of denitration, and the urea solution or the ammonia water can be ensured to contact with NOx in the smoke of the rotary hearth furnace to react under the optimal temperature condition of reaction.
And the inner walls of the gravity settling chamber and the flue from the gravity settling chamber to the waste heat boiler are wrapped by heat insulating materials, so that the reaction time is prolonged, the reaction rate of the spray gun is improved, and the aim of realizing the flue gas denitration of the rotary hearth furnace is fulfilled at low cost.
Drawings
FIG. 1 is a schematic view of a flow and a structure of a rotary hearth furnace flue gas denitration system of the present invention.
In the figure, the device comprises a rotary hearth furnace 1, a gravity settling chamber 2, a waste heat boiler 3, a cyclone dust collector 4, a bag-type dust collector 5, a draught fan 6, a draught fan 7, a silencer 8, a chimney 9, a spray gun device 10 and an ammonia water or urea solution storage device.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
Example 1
A rotary hearth furnace flue gas denitration system comprises a rotary hearth furnace 1, a gravity settling chamber 2, a waste heat boiler 3, a dust removal device, an induced draft fan 6 and a flue gas discharge pipeline; the outlet flue gas of the rotary hearth furnace 1 is connected to the inlet of the gravity settling chamber 2 through a pipeline, the outlet flue gas of the gravity settling chamber 2 is connected to the inlet of the waste heat boiler 3 through a pipeline, the outlet flue gas of the waste heat boiler 3 is connected to the dust removing device through a pipeline, the outlet flue gas of the dust removing device is connected to the inlet of the draught fan 6 through a pipeline, and the flue gas is discharged through a flue gas discharge pipeline after being pressurized by the draught fan 6. The barrel body of the gravity settling chamber 2 is connected with a plurality of spray gun devices 9, urea solution or ammonia water is sprayed by the spray gun devices 9 to react with NOx in the flue gas in the gravity settling chamber 2, and the aim of denitration is fulfilled.
Further, in the rotary hearth furnace flue gas denitration system, the gravity settling chamber 2 and the inner walls of the pipelines from the gravity settling chamber 2 to the exhaust-heat boiler 3 are wrapped with heat-insulating materials.
Further, in the above flue gas denitration system of the rotary hearth furnace, the dust removing device includes the cyclone dust collector 4.
Further, foretell rotary hearth furnace flue gas denitration system, dust collector still includes sack cleaner 5, and 3 export flue gases of exhaust-heat boiler pass through pipe connection to 4 entrys of cyclone, and 4 export flue gases of cyclone pass through pipe connection to 5 entrys of sack cleaner, and 5 export flue gases of sack cleaner pass through pipe connection to 6 entrys of draught fan. The cyclone dust collector 4 and the bag-type dust collector 5 can be one of the prior art.
Further, in the above system for denitration of flue gas of a rotary hearth furnace, the flue gas exhaust pipe is a chimney 8.
Further, foretell rotary hearth furnace flue gas denitration system, connect muffler 7 between draught fan 6 and the flue gas discharge pipe, the flue gas is after 6 pressure boost of draught fan, muffler 7 noise elimination, discharges through the flue gas discharge pipe.
Further, the rotary hearth furnace flue gas denitration system further comprises an ammonia water or urea solution storage device 10, and the spray gun device 9 is communicated with the ammonia water or urea solution storage device 10.
Example 2
A rotary hearth furnace flue gas denitration system comprises a rotary hearth furnace 1, a gravity settling chamber 2, a waste heat boiler 3, a cyclone dust collector 4, a bag-type dust collector 5, an induced draft fan 6, a silencer 7, a chimney 8, a spray gun device 9, an ammonia water or urea solution storage device 10 and the like.
Under the traditional condition, flue gas at the outlet of the rotary hearth furnace 1 enters the waste heat boiler 3 to recover flue gas waste heat after being subjected to primary dust removal through the gravity settling chamber 2, the flue gas at the outlet of the waste heat boiler 3 enters the bag-type dust remover 5 to remove dust and recover rich zinc oxide powder after being connected to the cyclone dust remover 4 through a pipeline for temperature control and further dust removal, and the flue gas at the outlet of the bag-type dust remover 5 is pressurized through the draught fan 6 and is discharged through a chimney after being muffled through the muffler.
Aiming at the increasingly strict flue gas emission standard of the current iron and steel enterprises, the utility model provides a converterA flue gas denitration system of a bottom furnace, wherein flue gas at an outlet of a rotary bottom furnace 1 enters a gravity settling chamber 2 through a pipeline, the temperature of the flue gas is about 1000 ℃, the flue gas is in an optimal reaction temperature range, a spray gun device is arranged on a cylinder body between an inlet and an outlet of the gravity settling chamber, ammonia water or urea solution is sprayed when the flue gas flows through the gravity settling chamber 2, and NH generated by urea decomposition is generated3Or NH in aqueous ammonia3Can efficiently react with NO in the flue gas to generate N2The aim of denitration is achieved, the inner walls of the gravity settling chamber 2 and the flue from the gravity settling chamber 2 to the inlet of the waste heat boiler 3 are wrapped with heat insulating materials, the temperature drop is low, the temperature of flue gas is always at the optimal reaction temperature of reaction, the reaction time and the reaction rate of denitration reaction are increased, the removal rate of NOx is improved, the temperature of the flue gas entering the waste heat boiler 3 is about 900-950 ℃, after waste heat is recovered by the waste heat boiler, the flue gas is connected to the cyclone dust collector 4 through a pipeline for temperature control and further dust removal, the flue gas enters the bag-type dust collector 5 for dust removal and recovery of zinc-rich oxide powder, the flue gas at the outlet of the bag-type dust collector 5 is pressurized by the draught fan 6, and is discharged through a chimney after the noise of the silencer, and the requirement of ultralow emission is met.
The waste heat boiler consists of a boiler barrel, a water-cooled wall, an evaporator, a superheater, an economizer, a furnace ash hopper, an ash removal device and the like.
The induced draft fan is used under negative pressure, air is pumped out of the system, and the working temperature is generally 160 ℃. The induced draft fan can be one of the prior art.
The green ball dryer is used as a hot air source for drying green balls.
The spray gun device can be one of the prior art.
Claims (7)
1. A rotary hearth furnace flue gas denitration system is characterized by comprising a rotary hearth furnace (1), a gravity settling chamber (2), a waste heat boiler (3), a dust removal device, an induced draft fan (6) and a flue gas discharge pipeline; there are a plurality of spray gun devices (9) on gravity settling chamber (2) barrel, rotary hearth furnace (1) export flue gas passes through pipe connection to gravity settling chamber (2) entry, gravity settling chamber (2) export flue gas passes through pipe connection to exhaust-heat boiler (3) entry, exhaust-heat boiler (3) export flue gas passes through pipe connection to dust collector, dust collector export flue gas passes through pipe connection to draught fan (6) entry, the flue gas is after draught fan (6) pressure boost, discharge through the flue gas discharge pipeline.
2. The rotary hearth furnace flue gas denitration system according to claim 1, wherein the inner walls of the gravity settling chamber (2) and the pipes from the gravity settling chamber (2) to the waste heat boiler (3) are wrapped with heat insulating materials.
3. The rotary hearth furnace flue gas denitration system according to claim 1, wherein said dust removing device comprises a cyclone (4).
4. The rotary hearth furnace flue gas denitration system according to claim 3, wherein the dust removing device further comprises a bag-type dust remover (5), the outlet flue gas of the waste heat boiler (3) is connected to an inlet of the cyclone dust remover (4) through a pipeline, the outlet flue gas of the cyclone dust remover (4) is connected to an inlet of the bag-type dust remover (5) through a pipeline, and the outlet flue gas of the bag-type dust remover (5) is connected to an inlet of the induced draft fan (6) through a pipeline.
5. The rotary hearth furnace flue gas denitration system according to claim 1, wherein said flue gas exhaust duct is a chimney (8).
6. The rotary hearth furnace flue gas denitration system according to claim 1, wherein a silencer (7) is connected between the induced draft fan (6) and the flue gas discharge pipeline, and the flue gas is pressurized by the induced draft fan (6), silenced by the silencer (7), and discharged through the flue gas discharge pipeline.
7. The rotary hearth furnace flue gas denitration system according to claim 1, further comprising an ammonia water or urea solution storage device (10), wherein the lance device is communicated with the ammonia water or urea solution storage device (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122198194.9U CN215692401U (en) | 2021-09-10 | 2021-09-10 | Rotary hearth furnace flue gas denitration system |
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| CN202122198194.9U CN215692401U (en) | 2021-09-10 | 2021-09-10 | Rotary hearth furnace flue gas denitration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116672840A (en) * | 2023-07-06 | 2023-09-01 | 泊头市京源环保有限公司 | Desulfurization and denitrification device and application method thereof |
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2021
- 2021-09-10 CN CN202122198194.9U patent/CN215692401U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116672840A (en) * | 2023-07-06 | 2023-09-01 | 泊头市京源环保有限公司 | Desulfurization and denitrification device and application method thereof |
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