CN116949240A - Converter primary flue gas full dry dedusting, energy full recovery and CO zero emission system - Google Patents
Converter primary flue gas full dry dedusting, energy full recovery and CO zero emission system Download PDFInfo
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- CN116949240A CN116949240A CN202311187273.7A CN202311187273A CN116949240A CN 116949240 A CN116949240 A CN 116949240A CN 202311187273 A CN202311187273 A CN 202311187273A CN 116949240 A CN116949240 A CN 116949240A
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- flue gas
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- converter
- energy
- temperature evaporator
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 239000003546 flue gas Substances 0.000 title claims abstract description 100
- 238000011084 recovery Methods 0.000 title claims abstract description 28
- 239000000428 dust Substances 0.000 claims abstract description 69
- 239000007789 gas Substances 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 22
- 238000009834 vaporization Methods 0.000 claims abstract description 22
- 230000008016 vaporization Effects 0.000 claims abstract description 22
- 230000003197 catalytic effect Effects 0.000 claims abstract description 21
- 230000003647 oxidation Effects 0.000 claims abstract description 21
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 21
- 238000007599 discharging Methods 0.000 claims description 95
- 238000000034 method Methods 0.000 claims description 35
- 230000005540 biological transmission Effects 0.000 claims description 33
- 230000000903 blocking effect Effects 0.000 claims description 15
- 230000033001 locomotion Effects 0.000 claims description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 23
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000779 smoke Substances 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chimneys And Flues (AREA)
Abstract
The application relates to a system for primary flue gas dry dedusting, energy full recovery and CO zero emission of a converter, which relates to the field of converter flue gas treatment and comprises a converter vaporization cooling flue, wherein the air inlet end of the converter vaporization cooling flue is connected with a dust catching and collecting hood for collecting converter flue gas, the air outlet end of the converter vaporization cooling flue is sequentially connected with a cyclone dust collector, a heat energy collector, a fan unit and a switching station through a pipeline, the switching station is respectively connected with a gas tank and a catalytic oxidation combustion chamber through pipelines, and the catalytic oxidation combustion chamber is sequentially connected with a heat exchanger and a diffusing tower through pipelines. The application has the effect of reducing the carbon monoxide discharge and protecting the environment.
Description
Technical Field
The application relates to the field of converter flue gas treatment, in particular to a system for primary flue gas dry dedusting, energy full recovery and CO zero emission of a converter.
Background
The oxygen blowing converter is a main smelting process equipment in steel production. The production method has more than 400 converters in China, and the annual output of the production method accounts for 70-80% of the output of crude steel in China. In the converter converting process, high-temperature flue gas containing a large amount of dust and combustible gas is generated, wherein the content of CO can reach more than 80%, the converter gas with high recovery value after dust removal and purification can reach more than 8000kJ/Nm 3.
In general, two main processes of a converter flue gas treatment system exist: one is a wet (OG and new OG) purge recovery system, and one is a dry (LT) purge recovery system.
The converter flue gas wet method (OG method) converter flue gas purifying and recycling system comprises the following process flows: after the converter flue gas enters a vaporization cooling flue to be indirectly cooled, the temperature is reduced to about 900 ℃ from 1600 ℃, then water is continuously sprayed into a first tower and a second tower Wen Da to be cooled to about 40 ℃, dust in the flue gas is simultaneously purified by water washing, so that the dust concentration of the flue gas is reduced to 30-50mg/Nm3, the flue gas enters a flue gas recovery system after the flue gas enters a dehydrator to be dehydrated, the gas meeting the requirements in the flue gas is recovered to a flue gas cabinet, and the unqualified flue gas is ignited and diffused by a diffusing tower. The whole system process adopts wet treatment.
The converter flue gas dry method (LT method) purifies recovery system, the technological process is: the converter flue gas is cooled indirectly by entering a vaporization cooling flue, then is cooled to about 900 ℃ from 1600 ℃, enters an evaporative cooler, mixed water vapor after vapor atomization is directly sprayed into the flue gas, and is cooled to 150-200 ℃ and enters a cylindrical electrostatic precipitator for dust removal, so that the dust concentration of the flue gas is reduced to below 15mg/Nm 3. And (3) entering a flue gas recovery system, wherein the gas meeting the requirements in the flue gas is recovered to a flue gas cabinet after being cooled to below 70 ℃ by a gas cooling tower, and unqualified flue gas is ignited and diffused by a diffusing tower.
Because the unqualified flue gas contains a large amount of carbon monoxide, the methods of the OG method and the LT method for finally treating the unqualified flue gas are all directly carried out ignition and diffusion at the top of the diffusion tower. However, in actual production, most of the flue gas is discharged to the outside directly after being burnt through the top of the diffusing tower, so that a large amount of carbon monoxide (CO) is discharged, and the environment is polluted.
Disclosure of Invention
In order to reduce the carbon monoxide emission and protect the environment, the application provides a system for the primary flue gas dry dedusting, the energy full recovery and the CO zero emission of the converter.
The application provides a converter primary flue gas full dry dedusting and energy full recovery and CO zero emission system, which adopts the following technical scheme:
the system comprises a converter vaporization cooling flue, wherein the air inlet end of the converter vaporization cooling flue is connected with a dust catching and collecting hood for collecting converter flue gas, the air outlet end of the converter vaporization cooling flue is sequentially connected with a cyclone dust collector, a heat energy collector, a fan unit and a switching station through a pipeline, the switching station is respectively connected with a gas tank and a catalytic oxidation combustion chamber through pipelines, and the catalytic oxidation combustion chamber is sequentially connected with a heat exchanger and a diffusing tower through pipelines.
By adopting the technical scheme, the dust collecting and gas collecting hood collects the flue gas generated by the converter, the flue gas enters the converter vaporization cooling flue along the dust collecting and gas collecting hood, and the flue gas is cooled in the converter vaporization cooling flue. And then the flue gas enters a cyclone dust collector, the cyclone dust collector filters slag and smoke dust in the flue gas, dust removal of the flue gas is realized, and then the flue gas enters a heat energy collector, and the heat energy collector recovers heat energy in the flue gas. And the flue gas enters a switching station along the fan unit, and when the flue gas is qualified gas, the qualified gas enters a gas tank along a pipeline for collection. When the flue gas is unqualified gas, the unqualified gas enters the catalytic oxidation combustion chamber along the pipeline and is fully combusted in the catalytic oxidation combustion chamber, carbon monoxide in the unqualified gas completely reacts with oxygen to generate carbon dioxide, the flue gas with carbon monoxide removed is diffused by the heat exchanger and the diffusing tower, and the carbon monoxide is reduced to be discharged, so that the environment is protected, and the heat exchanger can recover heat generated by chemical reaction in the catalytic oxidation combustion chamber, namely, the chemical energy is recycled.
Preferably, a flame arrester is connected between the heat energy collector and the fan unit through a pipeline.
Through adopting above-mentioned technical scheme, the flame arrester can play the explosion-proof effect of putting out a fire, reduces the flue gas and because the high temperature so the condition that produces flame takes place in the conveying process, the safe conveying of easily flue gas.
Preferably, a medium temperature evaporator and a low temperature evaporator are sequentially connected between the flame arrester and the fan unit through pipelines, and the medium temperature evaporator and the low temperature evaporator are respectively connected with an energy accumulator through pipelines.
Through adopting above-mentioned technical scheme, medium temperature evaporator, low temperature evaporator can cool down the flue gas, and the heat energy steam that produces in this in-process gets into the accumulator along the pipeline and gathers to carry out the recovery of heat energy.
Preferably, an ultra-low emission treatment system is connected between the low-temperature evaporator and the fan unit through a pipeline.
By adopting the technical scheme, the ultralow emission treatment system performs ultralow emission filtration on the flue gas, and filters smoke dust in the flue gas.
Preferably, the economizer and the preheater are sequentially connected between the ultralow emission treatment system and the fan unit through pipelines, the economizer and the preheater are respectively connected with a steam drum through pipelines, and the catalytic oxidation combustion chamber and the heat exchanger are also respectively connected with the steam drum through pipelines.
Through adopting above-mentioned technical scheme, economizer and preheater carry out heat recovery to the flue gas here, and the heat of the flue gas in the catalytic oxidation combustion chamber and the heat that heat exchanger absorbed all get into the steam drum through the pipeline simultaneously, realize the recycle of heat energy and chemical energy.
Preferably, the cyclone dust collector, the heat energy collector and the flame arrester are respectively connected with the energy accumulator through pipelines.
Through adopting above-mentioned technical scheme, the heat energy steam that produces among cyclone, heat energy collector and the flame arrester all gets into in the accumulator through the pipeline and collects.
Preferably, a U-shaped medium temperature evaporator is connected between the medium temperature evaporator and the low temperature evaporator through a pipeline, the U-shaped medium temperature evaporator is connected with an energy storage device through a pipeline, and a dust collector is connected to the U-shaped medium temperature evaporator.
Through adopting above-mentioned technical scheme, the flue gas is cooled down to U-shaped medium temperature evaporimeter, and the heat energy steam of production gets into the accumulator along the pipeline simultaneously and gathers, and the flue gas that gets into in the U-shaped medium temperature evaporimeter carries out dust filtration through the dust collector simultaneously.
Preferably, the lower extreme of cyclone contracts gradually and is the pointed end, one side rotation of cyclone pointed end is connected with the governing pipe, the governing pipe slope sets up, the governing pipe deviates from two gradually downward sloping's of cyclone's an terminal surface fixedly connected with ash discharging tube, and one of them ash discharging tube is located the top of another ash discharging tube, be connected with drive governing pipe pivoted actuating mechanism on the cyclone, every all be connected with on the ash discharging tube and adjust ash discharging tube shutoff or open restriction mechanism.
Through adopting above-mentioned technical scheme, the ash discharging pipe that lies in the top through the restriction mechanism control is blocked, and the shutoff pipe that lies in the below is opened, and the smoke and dust in the cyclone discharges gradually along the shutoff pipe of below like this, and the ash discharging pipe that the slope set up is convenient for slow down the ash discharging speed of smoke and dust, reduces the in-process emergence of dust. When the ash discharging pipe below is blocked so as to stop ash discharging, the driving mechanism is started to drive the regulating pipe to rotate, and the regulating pipe rotates to drive the two ash discharging pipes to rotate around the axis of the regulating pipe, so that the two ash discharging pipes are driven to exchange positions. Then the other ash discharging pipe which rotates to the lower part can be controlled to be in an open state, so that the continuous ash discharging of the cyclone dust collector is facilitated.
Preferably, the limiting mechanism comprises a guide pipe sleeved in the adjusting pipe, one end of the guide pipe is fixedly connected with the cyclone dust collector, the other end of the guide pipe is provided with an inclined opening which is gradually inclined downwards along the direction close to the bottom end of the cyclone dust collector, each ash discharging pipe is internally and slidably connected with a transmission rod, a spring is arranged between each transmission rod and the corresponding ash discharging pipe, one end of each transmission rod is fixedly connected with a blocking plate, the other end of each transmission rod is tightly abutted to one end face of the guide pipe, which is provided with the inclined opening, by the elasticity of the spring, the blocking plate at the upper side is clamped inside the ash discharging pipe at the upper side, the blocking plate at the lower side extends out of the lower end of the ash discharging pipe, and the two blocking plates are gradually inclined downwards along the direction close to each other.
Through adopting above-mentioned technical scheme, when the regulation pipe rotates and drives two ash discharging pipes and rotate, the ash discharging pipe rotates and drives the transfer line in every ash discharging pipe and rotate together, and the ash discharging pipe that is located the top is in the in-process of gradually downwarping, and the one end of guide tube bevel connection promotes the transfer line and unloads the ash pipe gradually downwards to move relatively, and the transfer line motion promotes the shutoff board to break away from gradually downwards and unload inside the ash pipe, and the ash discharging pipe is opened this moment. In the process that the ash discharging pipe positioned below gradually rotates upwards, the transmission rod moves upwards relative to the ash discharging pipe by the elasticity of the spring, and at the moment, the transmission rod drives the blocking plate to gradually enter the ash discharging pipe and block the ash discharging pipe. In the process of rotating the two ash discharging pipes, the limiting mechanism automatically controls whether the ash discharging pipes are dredged or not, and a power source is not added, so that resources are saved.
The shutoff of unloading pipe can be realized when the shutoff board is located unloading intraductal, and when the shutoff board stretches out unloading pipe from the lower extreme of unloading pipe, unloading pipe resumes the mediation, and the shutoff board that the slope set up this moment can slow down the unloading speed of smoke and dust from unloading pipe, and then reduces the condition emergence of raise dust.
Preferably, each ash discharging pipe is internally hinged with a plurality of dredging rods, each dredging rod is connected with the inner wall of the ash discharging pipe through a torsion spring, each transmission rod is fixedly connected with a plurality of linkage blocks, one linkage block corresponds to one dredging rod and is abutted against the upper side face of the dredging rod, the transmission rod pushes the dredging rod to rotate downwards through the linkage block in the process of downwards moving the corresponding ash discharging pipe, and the torsion spring is gradually in a force storage state.
Through adopting above-mentioned technical scheme, the in-process of relative unloading pipe upward movement of transfer line, transfer line drive every linkage piece gradually upward movement, every mediation pole receives torsional spring's effort to rotate gradually upward this moment. In the downward movement process of the transmission rod loudness ash discharging pipe, the transmission rod drives each linkage block to gradually move downwards, each linkage block gradually pushes the dredging rod downwards, and the dredging rod gradually rotates downwards. The dust in the ash discharging pipe can be dredged in the process of the up-and-down rotation of the dredging rod. And when the interchange positions of the two ash discharging pipes are regulated, each dredging rod can automatically rotate under the drive of the transmission rod and the torsion spring.
In summary, the present application includes at least one of the following beneficial technical effects:
smoke dust in the smoke is removed, so that heat energy and chemical energy are recovered, zero emission of carbon monoxide is realized, and the environment is protected;
the purification process does not involve resource waste, runs stably, overcomes the defect of the existing converter gas purification, and has higher practical value and economic value;
the occurrence of flame generated by high temperature of the flue gas in the conveying process is reduced, and the safe conveying of the flue gas is easy;
when one of the ash discharging pipes is plugged, the position interchange of the two ash discharging pipes can be realized, the cyclone dust collector can continuously discharge ash, and meanwhile, in the process of exchanging the positions of the ash discharging pipes, the limiting mechanism automatically controls whether the ash discharging pipes are dredged or not, and the dredging rod automatically swings to dredge the ash discharging pipes.
Drawings
FIG. 1 is an overall flow chart embodying the present system according to an embodiment of the present application.
Fig. 2 is a schematic structural view of a cyclone dust collector embodying the embodiment of the present application.
Fig. 3 is a schematic structural view of a limiting mechanism according to an embodiment of the present application.
Fig. 4 is a schematic structural view showing the connection of the dredging rod and the ash discharging pipe according to the embodiment of the application.
Reference numerals illustrate: 10. a converter vaporization cooling flue; 20. a cyclone dust collector; 201. an ash discharging pipe; 2011. a guide groove; 202. an adjusting tube; 203. a driving mechanism; 2031. a driving motor; 2032. a gear; 2033. convex teeth; 204. a restriction mechanism; 2041. a guide tube; 2042. a guide block; 2043. a transmission rod; 2044. a plugging plate; 2045. a spring; 205. a dredging rod; 206. a rotating shaft; 207. a torsion spring; 208. a linkage block; 209. an auxiliary discharging mechanism; 2091. a connecting shaft; 2092. a fan blade; 2093. installing a motor; 30. a thermal energy collector; 40. a flame arrester; 50. a medium temperature evaporator; 60. a U-shaped medium temperature evaporator; 70. a low temperature evaporator; 80. an ultra low emission treatment system; 90. an economizer; 100. a preheater; 110. a fan unit; 120. a switching station; 130. a gas cabinet; 140. a catalytic oxidation combustion chamber; 150. a heat exchanger; 160. a diffusing tower; 170. an energy storage; 180. a steam drum; 190. and an ash discharging system.
Detailed Description
The application is described in further detail below with reference to fig. 1-4.
The embodiment of the application discloses a converter primary flue gas full dry dedusting, energy full recovery and CO zero emission system. Referring to fig. 1, the system comprises a converter vaporization cooling flue 10, and a dust collecting and gas collecting hood is connected to the air inlet end of the converter vaporization cooling flue 10 and is used for collecting flue gas generated in the working process of the converter. The flue gas enters the converter vaporization cooling flue 10 through the dust collecting gas hood.
After the flue gas passes through the converter vaporization cooling flue 10, the temperature of the flue gas is reduced from 1600 ℃ to 1100-900 ℃. The converter vaporization cooling flue 10 is communicated with an energy accumulator 170 through a pipeline, and heat energy steam generated in the converter vaporization cooling flue 10 by the flue gas enters the energy accumulator 170 along the pipeline to be collected.
The gas outlet end of the converter vaporization cooling flue 10 is connected with the gas inlet end of the cyclone dust collector 20, the flue gas is cooled and dedusted in the cyclone dust collector 20, the gas outlet end of the cyclone dust collector 20 is connected with the heat energy collector 30, the gas outlet end of the cyclone dust collector 20 is communicated with the flame arrester 40 through the heat energy collector 30, the flue gas enters the heat energy collector 30 from the gas outlet end of the cyclone dust collector 20, and the temperature of the flue gas passing through the heat energy collector 30 is reduced to 850-700 ℃. Then the flue gas enters the flame arrester 40, the flame arrester 40 performs fire-extinguishing and explosion-proof treatment on the flue gas, and the temperature of the flue gas passing through the flame arrester 40 is reduced to 600-450 ℃.
The cyclone dust collector 20, the heat energy collector 30 and the flame arrester 40 are communicated with the energy accumulator 170 through pipelines, and heat energy steam generated in the cyclone dust collector 20, the heat energy collector 30 and the flame arrester 40 is collected in the energy accumulator 170 through pipelines.
The gas outlet end of the flame arrester 40 is sequentially connected with a medium temperature evaporator 50, a U-shaped medium temperature evaporator 60 and a low temperature evaporator 70 through pipelines, the medium temperature evaporator 50, the U-shaped medium temperature evaporator 60 and the low temperature evaporator 70 are communicated with the energy accumulator 170 through pipelines, the medium temperature evaporator 50, the U-shaped medium temperature evaporator 60 and the low temperature evaporator 70 perform cooling treatment on the flue gas again, the temperature of the flue gas is gradually reduced in the process of passing through the medium temperature evaporator 50, the U-shaped medium temperature evaporator 60 and the low temperature evaporator 70, and the temperature of the flue gas at the outlet position of the low temperature evaporator 70 is 400-200 ℃. And the thermal energy vapor generated in the process can enter the accumulator 170 for collection.
Wherein the U-shaped medium temperature evaporator 60 is provided with a dust collector, and the dust collector and the U-shaped medium temperature evaporator 60 are integrally arranged. In the process that the flue gas passes through the U-shaped medium-temperature evaporator 60, the dust collector collects and filters the smoke dust in the flue gas.
The cryogenic evaporator 70 is connected by piping to an ultra-low emission treatment system 80, the ultra-low emission treatment system 80 being used to more finely filter the smoke in the flue gas, thereby further reducing the smoke content in the flue gas. The ultra-low emission treatment system 80 includes a dust collector for filtering the soot.
The gas outlet end of the ultralow emission treatment system 80 is sequentially connected with the economizer 90, the preheater 100 and the fan unit 110, the economizer 90 and the preheater 100 cool the flue gas again, the temperature of the flue gas at the outlet of the preheater 100 is reduced to 100-40 ℃, the economizer 90 is connected with the steam drum 180 through a pipeline, and the preheater 100 is also connected with the steam drum 180 through a pipeline. Both the economizer 90 and the preheater 100 can cool the flue gas, while the heat energy in the flue gas can enter the drum 180 for recovery.
The fan unit 110 includes an induced draft fan, and the fan unit 110 provides power to the entire system.
The fan assembly 110 is connected to the switching station 120 through a pipeline, the switching station 120 is connected to the gas cabinet 130 and the catalytic oxidation combustion chamber 140 through pipelines, respectively, and the switching station 120 comprises a quick switching valve installed on the pipeline. The outlet end of the catalytic oxidation combustion chamber 140 is connected with a heat exchanger 150, and the outlet end of the catalytic oxidation combustion chamber 140 is connected with a diffusing tower 160 through the heat exchanger 150.
A gas analyzer is installed on a pipe connected between the fan unit 110 and the switching station 120, and the gas analyzer is electrically connected with a controller, and the controller is electrically connected with a fast switching valve. The gas analyzer is used for measuring the concentration of the gas in the flue gas and feeding back signals to the controller, and the controller is used for controlling whether the pipeline communicated with the gas tank 130 is dredged or not and controlling whether the pipeline communicated with the catalytic oxidation combustion chamber 140 is dredged or not.
Both the catalytic oxidation combustor 140 and the heat exchanger 150 are in communication with the drum 180 via pipes.
Qualified gas enters the gas cabinet 130 along a pipeline, unqualified gas enters the catalytic oxidation combustion chamber 140 to be fully combusted, and carbon monoxide and oxygen are subjected to chemical reaction in the combustion process to generate carbon dioxide, so that the complete conversion of the carbon monoxide is realized. And meanwhile, a great amount of heat is generated by the chemical reaction of carbon monoxide and oxygen, and the great amount of heat generated by the reaction enters the steam drum 180 through the heat exchanger 150, so that the chemical energy is recycled. While the waste heat of the flue gas entering the catalytic oxidation combustion chamber 140 also enters the drum 180 through the pipe. And finally, the flue gas enters a diffusing tower 160 for diffusing, so that zero emission of carbon monoxide is realized.
The ash discharging pipe 201 of the cyclone dust collector 20 is connected with an ash discharging system 190, and the ash discharging pipes 201 of the dust collector and the ultra-low emission treatment system 80 are also connected with the ash discharging system 190, and the ash discharging system 190 conveys the filtered smoke dust in the smoke to an ash storage bin.
Referring to fig. 2 and 3, in order to facilitate smooth ash discharge of the cyclone 20, two ash discharge pipes 201 are installed at the lower end of the cyclone 20, the lower end of the cyclone 20 gradually contracts to be pointed, one side of the pointed end is rotatably connected with an adjusting pipe 202, one end surface of the adjusting pipe 202 is opened, and the opened end of the adjusting pipe 202 is communicated with the inside of the cyclone 20. One end of each ash discharge pipe 201 is fixed to and communicates with an end face of the adjustment pipe 202 facing away from the cyclone 20. The adjusting pipes 202 are arranged obliquely, wherein one of the ash discharging pipes 201 is positioned obliquely above the other ash discharging pipe 201. A driving mechanism 203 for driving the adjustment tube 202 to reciprocally rotate is connected to the adjustment tube 202. Each ash discharging pipe 201 is connected with a limiting mechanism 204 for controlling whether the ash discharging pipe 201 is dredged or not.
The driving mechanism 203 comprises a driving motor 2031 fixedly connected with an outer side wall of the cyclone dust collector 20, and a gear 2032 is coaxially fixed on an output shaft of the driving motor 2031. The outer side wall of the adjusting tube 202 is fixedly connected with a circle of convex teeth 2033, and the gear 2032 is meshed with the convex teeth 2033.
The driving motor 2031 is started, the output shaft of the driving motor 2031 rotates to drive the adjusting pipe 202 to rotate, and the adjusting pipe 202 rotates to drive the two ash discharging pipes 201 to rotate until the positions of the two ash discharging pipes 201 are interchanged.
When the cyclone 20 normally discharges ash, the ash discharge pipe 201 positioned below is controlled to be in a dredging state by the limiting mechanism 204, the ash discharge pipe 201 positioned above is still in a closed state, and at the moment, the smoke dust in the cyclone 20 is discharged along the ash discharge pipe 201 positioned below. Both ash discharging pipes 201 are obliquely arranged, so that the ash discharging speed is conveniently slowed down, and the occurrence of dust emission is reduced.
When the lower ash discharging pipe 201 is blocked, the driving mechanism 203 is started to drive the two ash discharging pipes 201 to change positions, and at the moment, the other ash discharging pipe 201 is controlled to start ash discharging, so that the maintenance of the ash discharging pipe 201 by the cyclone dust collector 20 is not required to be stopped, and the cyclone dust collector 20 is convenient to continuously discharge ash.
Referring to fig. 3 and 4, the restricting mechanism 204 includes a guide tube 2041 fitted inside the regulating tube 202, both ends of the guide tube 2041 being open and one end being fixed to and communicating with the cyclone 20. The adjusting pipe 202 is rotatably connected with the guide pipe 2041, and one end of the guide pipe 2041 facing away from the cyclone 20 is a bevel which gradually inclines upwards.
Guide grooves 2011 are formed in the inner side walls of the two ash discharging pipes 201, and guide blocks 2042 are slidably connected in each guide groove 2011. A transmission rod 2043 is inserted into each ash discharging pipe 201, one transmission rod 2043 corresponds to one guide block 2042, and one side of the transmission rod 2043 is fixedly connected with the guide block 2042. One end of each transmission rod 2043 is abutted against the end face of the guide tube 2041, which is provided with a bevel, the other end of each transmission rod 2043 is fixedly connected with a plugging plate 2044, and the plugging plate 2044 is clamped into the ash discharging tube 201 to plug the ash discharging tube 201. The two blocking plates 2044 gradually incline downward toward each other.
A spring 2045 is disposed in each guide slot 2011, one end of the spring 2045 is fixedly connected with a side wall of the guide slot 2011, and the other end is fixedly connected with the guide block 2042. Each of the transmission rods 2043 is pressed against the end surface of the guide tube 2041 provided with the bevel by the elastic force of the spring 2045. The blocking plate 2044 positioned above is arranged in the ash discharging pipe 201 above and blocks the ash discharging pipe 201, the blocking plate 2044 positioned below extends out of the ash discharging pipe 201 below, and the blocking plate 2044 positioned below is arranged at the opening of the lower end of the ash discharging pipe 201 below, so that dust is decelerated through the blocking plate 2044 in the ash discharging process of the ash discharging pipe 201, and dust emission is reduced.
In the process that the driving mechanism 203 drives the adjusting pipe 202 to rotate, the adjusting pipe 202 drives the two ash discharging pipes 201 to rotate around the axis of the adjusting pipe 202. In the process, the upper transmission rod 2043 gradually extends downwards to the upper ash discharging pipe 201 under the pushing of the inclined opening of the guide opening, and the transmission rod 2043 drives the blocking plate 2044 to gradually extend into the ash discharging pipe 201; the lower transmission rod 2043 gradually moves towards the direction approaching the cyclone dust collector 20 under the elasticity of the spring 2045, and the transmission rod 2043 drives the plugging plate 2044 to be gradually inserted into the ash discharging pipe 201 and plug the ash discharging pipe 201. That is, the ash discharging pipes 201 are automatically opened during the gradual downward rotation of each ash discharging pipe 201, and the ash discharging pipes 201 are automatically closed during the gradual upward rotation of each ash discharging pipe 201.
In order to facilitate automatic dredging of the ash discharging pipes 201, a plurality of dredging rods 205 are hinged to the inner wall of each ash discharging pipe 201, and the dredging rods 205 are arranged along the length direction of the ash discharging pipe 201. Each transmission rod 2043 is connected with a linkage, and in the process that the transmission rods 2043 slide along the ash discharging pipe 201, the transmission rods 2043 drive the dredging rods 205 to rotate in the ash discharging pipe 201 through the linkage.
The inside rotation of ash unloading pipe 201 is connected with a plurality of pivots 206, and a pivot 206 corresponds a mediation pole 205, and the one end and the mediation pole 205 fixed connection of pivot 206. A torsion spring 207 is sleeved on each rotating shaft 206, one end of the torsion spring 207 is fixedly connected with the dredging rod 205, and the other end of the torsion spring 207 is fixedly connected with the inner wall of the ash discharging pipe 201.
The linkage member includes a linkage block 208 fixedly connected to each of the transmission rods 2043, one linkage block 208 corresponds to one of the dredging rods 205, and the linkage block 208 abuts against the upper side surface of the dredging rod 205. When the dredging rod 205 is gradually inclined downwards from the hinged end to the free end, the torsion spring 207 is in a force storage state. When the dredging rod 205 is gradually inclined upwards from the hinged end to the free end, the torsion spring 207 is in a normal state.
During the gradual upward rotation of the ash discharge pipe 201, the transmission rod 2043 moves gradually upward relative to the ash discharge pipe 201, and at this time, each dredging rod 205 rotates gradually upward under the force of the torsion spring 207. When the ash discharging pipe 201 rotates downward gradually, the transmission rod 2043 moves downward gradually relative to the ash discharging pipe 201, and at this time, the transmission rod 2043 drives each linkage block 208 to move downward relative to the ash discharging pipe 201, and the linkage blocks 208 push the dredging rods 205 to rotate downward gradually. The dust in the dust discharging pipe 201 can be stirred and dredged in the process of rotating the dredging rod 205.
To facilitate the discharge of soot along the soot discharge tube 201, a discharge assist mechanism 209 is coupled to the cyclone 20. The drainage assisting mechanism 209 comprises a connecting shaft 2091 rotatably connected with the inner cavity wall of the cyclone 20, and a plurality of fan blades 2092 are fixedly connected to the peripheral side of the connecting shaft 2091. The outer side wall of the tip of the cyclone 20 is fixedly connected with a mounting motor 2093, and an output shaft of the mounting motor 2093 penetrates through the side wall of the cyclone 20 and stretches into the cyclone 20 to be coaxially fixed with a connecting shaft 2091, wherein the connecting shaft 2091 is consistent with the inclination direction of the adjusting pipe 202.
The embodiment of the application provides a full dry dedusting and full energy recovery and CO zero emission system for primary flue gas of a converter, which is implemented by the following principles: flue gas generated by the converter enters the converter vaporization cooling flue 10 through the dust catching gas collecting hood, then sequentially passes through the heat energy collector 30, the flame arrester 40, the medium-temperature evaporator 50, the U-shaped medium-temperature evaporator 60 and the low-temperature evaporator 70, then sequentially enters the super-emission system, the economizer 90, the preheater 100 and the fan unit 110, then the flue gas passes through the switching station 120, qualified gas enters the gas cabinet 130 along a pipeline, unqualified gas enters the catalytic oxidation combustion chamber 140 for full combustion, carbon monoxide is removed from the combusted flue gas, and then the flue gas passes through the heat exchanger 150 and the diffusion tower 160 and is diffused. The flue gas is subjected to dust removal by a ten-step full-dry method of the system, so that the full recovery of heat energy and the zero emission of carbon monoxide are basically realized, and the chemical energy in the carbon monoxide reaction process is also recovered.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. The system for the full dry dedusting of the primary flue gas of the converter, the full recovery of energy and the zero emission of CO is characterized in that: including converter vaporization cooling flue (10), the inlet end of converter vaporization cooling flue (10) is connected with the dust catching gas collecting hood that is used for collecting converter flue gas, the end of giving vent to anger of converter vaporization cooling flue (10) has connected gradually cyclone (20), heat energy collector (30), fan unit (110) and switching station (120) through the pipeline, switching station (120) are connected with gas holder (130) and catalytic oxidation combustion chamber (140) respectively through the pipeline, catalytic oxidation combustion chamber (140) have connected gradually heat exchanger (150) and diffusing tower (160) through the pipeline.
2. The system for primary flue gas dry dedusting, energy full recovery and CO zero emission of the converter according to claim 1, which is characterized in that: and a flame arrester (40) is connected between the heat energy collector (30) and the fan unit (110) through a pipeline.
3. The converter primary flue gas full dry dedusting, energy full recovery and CO zero emission system according to claim 2, wherein the system is characterized in that: the low-temperature evaporator is characterized in that a medium-temperature evaporator (50) and a low-temperature evaporator (70) are sequentially connected between the flame arrester (40) and the fan unit (110) through pipelines, and the medium-temperature evaporator (50) and the low-temperature evaporator (70) are respectively connected with an energy accumulator (170) through pipelines.
4. The system for primary flue gas dry dedusting, energy full recovery and CO zero emission of the converter according to claim 3, wherein the system is characterized in that: an ultra-low emission treatment system (80) is connected between the low-temperature evaporator (70) and the fan unit (110) through a pipeline.
5. The system for primary flue gas dry dedusting, energy full recovery and CO zero emission of the converter according to claim 4, which is characterized in that: the ultra-low emission treatment system (80) and the fan unit (110) are sequentially connected with the economizer (90) and the preheater (100) through pipelines, the economizer (90) and the preheater (100) are respectively connected with the steam drum (180) through pipelines, and the catalytic oxidation combustion chamber (140) and the heat exchanger (150) are also respectively connected with the steam drum (180) through pipelines.
6. The system for primary flue gas dry dedusting, energy full recovery and CO zero emission of the converter according to claim 3, wherein the system is characterized in that: the cyclone dust collector (20), the heat energy collector (30) and the flame arrester (40) are respectively connected with the energy accumulator (170) through pipelines.
7. The system for primary flue gas dry dedusting, energy full recovery and CO zero emission of the converter according to claim 3, wherein the system is characterized in that: the dust collector is characterized in that a U-shaped medium-temperature evaporator (60) is connected between the medium-temperature evaporator (50) and the low-temperature evaporator (70) through a pipeline, the U-shaped medium-temperature evaporator (60) is connected with an energy accumulator (170) through a pipeline, and the U-shaped medium-temperature evaporator (60) is connected with the dust collector.
8. The converter primary flue gas full dry dedusting, energy full recovery and CO zero emission system according to any one of claims 1 to 6, characterized in that: the lower extreme of cyclone (20) contracts gradually and is the pointed end, one side rotation of cyclone (20) pointed end is connected with regulation pipe (202), regulation pipe (202) slope sets up, one end face fixedly connected with that regulation pipe (202) deviate from cyclone (20) unloads ash pipe (201) of downward sloping gradually, and one of them unloads ash pipe (201) and is located the top of another ash pipe (201), be connected with on cyclone (20) drive regulation pipe (202) pivoted actuating mechanism (203), every it all is connected with on ash pipe (201) regulation and unloads ash pipe (201) shutoff or opens limiting mechanism (204).
9. The system for primary flue gas dry dedusting, energy full recovery and CO zero emission of the converter according to claim 8, which is characterized in that: the limiting mechanism (204) comprises a guide pipe (2041) sleeved in the adjusting pipe (202), one end of the guide pipe (2041) is fixedly connected with the cyclone dust collector (20), the other end of the guide pipe is provided with an inclined opening which is gradually inclined downwards along the direction close to the bottom end of the cyclone dust collector (20), each ash discharging pipe (201) is internally and slidably connected with a transmission rod (2043), a spring (2045) is arranged between each transmission rod (2043) and the corresponding ash discharging pipe (201), one end of each transmission rod (2043) is fixedly connected with a blocking plate (2044), the other end of each transmission rod is tightly abutted to one end face of the guide pipe (2041) to be provided with an inclined opening by the elastic force of the spring (2045), the blocking plate (2044) located above is clamped inside the ash discharging pipe (201) above, the blocking plate (2044) located below stretches out of the lower end of the ash discharging pipe (201), and the two blocking plates (2044) are gradually inclined downwards along the direction close to each other.
10. The converter primary flue gas full dry dedusting, energy full recovery and CO zero emission system according to claim 9, wherein the system is characterized in that: every all articulate in unloading ash pipe (201) have a plurality of mediation poles (205), every dredge pole (205) all with unload and be connected through torsional spring (207) between the inner wall of ash pipe (201), all fixedly connected with a plurality of linkage pieces (208) on every transfer line (2043), a linkage piece (208) corresponds a mediation pole (205) and the upper side of linkage piece (208) conflict mediation pole (205), the process of transfer line (2043) relative unloading ash pipe (201) downward movement is through linkage piece (208) promotion dredge pole (205) rotation down, torsional spring (207) are the power state gradually.
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| CN202311187273.7A CN116949240B (en) | 2023-09-14 | 2023-09-14 | Converter primary flue gas full dry dedusting, energy full recovery and CO zero emission system |
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