CN116445672B - Blast furnace gas fine desulfurization dust-blocking filtering ash-cleaning system and use method thereof - Google Patents
Blast furnace gas fine desulfurization dust-blocking filtering ash-cleaning system and use method thereof Download PDFInfo
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- CN116445672B CN116445672B CN202310262384.3A CN202310262384A CN116445672B CN 116445672 B CN116445672 B CN 116445672B CN 202310262384 A CN202310262384 A CN 202310262384A CN 116445672 B CN116445672 B CN 116445672B
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- blast furnace
- blocking filtering
- furnace gas
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- 238000001914 filtration Methods 0.000 title claims abstract description 108
- 238000004140 cleaning Methods 0.000 title claims abstract description 41
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 31
- 230000023556 desulfurization Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000428 dust Substances 0.000 claims abstract description 120
- 239000000945 filler Substances 0.000 claims abstract description 45
- 238000007664 blowing Methods 0.000 claims abstract description 38
- 238000006298 dechlorination reaction Methods 0.000 claims abstract description 25
- 230000000903 blocking effect Effects 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims abstract description 6
- 239000004744 fabric Substances 0.000 claims abstract description 4
- 239000002956 ash Substances 0.000 claims description 62
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 4
- 239000010882 bottom ash Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 18
- 239000007789 gas Substances 0.000 description 52
- 238000012856 packing Methods 0.000 description 11
- 230000000382 dechlorinating effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- -1 chlorine ions Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/22—Dust arresters
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/42—Sulphur removal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
The invention discloses a blast furnace gas fine desulfurization dust-blocking filtration ash removal system and a use method thereof, wherein the system is arranged between a bag-type dust remover and a pretreatment tower; the cloth bag dust remover is connected with a lower air inlet of the dust-blocking filtering ash removing device through a blast furnace gas conveying pipeline, and the dust-blocking filtering ash removing device is filled with filler, has a funnel-shaped bottom and is connected with the ash conveying device through an ash conveying pipeline; the upper part of the dust-blocking filtering ash-cleaning device is connected to the back blowing device through a back blowing system conveying pipeline, and the lower end of the dust-blocking filtering ash-cleaning device is connected with the dust collecting device through a dust collecting conveying pipeline; the blast furnace gas after the treated furnace dust content reaches the set index requirement enters a pretreatment tower through a blast furnace gas conveying pipeline; the controller is in communication connection with the dust blocking, filtering and cleaning device, the back blowing device, the dust collecting device and the ash conveying device. The treatment of the system of the invention can further reduce the furnace dust entering the dechlorination tower and the back-end equipment, reduce the replacement frequency of the dechlorination agent and improve the use efficiency of the dechlorination agent.
Description
Technical Field
The invention belongs to the technical field of blast furnace gas desulfurization, and particularly relates to a blast furnace gas fine desulfurization dust-blocking filtering ash-removing system and a using method thereof.
Background
The blast furnace gas furnace dust refers to fine particle solid furnace burden carried out when gas rises in the blast furnace ironmaking process. The dust concentration of blast furnace gas discharged from the furnace top is 10-40g/m 3 In the range of 80-100g/m, high values may be achieved 3 After the dust removal by the bag-type dust remover, the outlet emission index is basically controlled at 10mg/m 3 And then enters a blast furnace gas fine desulfurization system.
For the implementation of blast furnace gas fine desulfurization, the main flow technical route and the structure of the fine desulfurization system are shown in fig. 1 and 2 respectively. After the blast furnace gas (dirty gas) is dedusted by a bag-type dust remover, the content of furnace dust is reduced to 10mg/m 3 Inside, through removal ofThe blast furnace gas (dirty gas) after dust enters the dechlorination tower to be dechlorinated at first, the flow rate of the blast furnace gas after entering the dechlorination tower is reduced, as the running time goes on, the furnace dust is blocked by the filler dechlorination agent in the dechlorination tower and is slowly deposited, the dechlorination agent is wrapped, pores of the dechlorination agent are blocked, and the like, so that the following problems are mainly caused to occur:
(1) The resistance of the packing layer of the dechlorination tower rises to exceed a design value, so that the blast furnace gas fine desulfurization system is forced to stop for cleaning or a fresh dechlorination agent is replaced in time;
(2) Dechlorination efficiency of the dechlorination tower is reduced, and in order to meet the dechlorination efficiency, the frequency (times) of replacing the dechlorination agent is accelerated, and the dechlorination agent needs to be replaced when the service life is not reached;
(3) As dechlorination efficiency is reduced, the unremoved chlorine-containing acid gas is dissolved in the gas condensate water to form an acid solution, so that pipelines are corroded, and the safety of gas transportation is reduced;
(4) If the dechlorination agent is not replaced timely, the hydrolysis conversion efficiency is also reduced along with the chlorine ions entering the hydrolysis tower, and the hydrolysis agent is deactivated, so that two effects are caused: 1. the alkaline center on the surface of the hydrolysis catalyst is reduced. 2. Blocking the catalyst pore canal and covering part of the active site.
Disclosure of Invention
In order to overcome the problems of the prior art, the invention provides a blast furnace gas fine desulfurization dust-blocking filtering ash-cleaning system and a use method thereof, wherein the blast furnace gas fine desulfurization dust-blocking filtering ash-cleaning system is arranged between an existing bag-type dust collector and a pretreatment tower, so that furnace dust entering a dechlorination tower and rear-end equipment is further reduced, the service time of a dechlorination agent is prolonged, the replacement frequency of the dechlorination agent is reduced, the service efficiency of the dechlorination agent is improved, the system resistance is ensured to be within a reasonable range, the corrosion of the rear-end equipment is avoided, and the safety of gas transportation is improved.
The purpose of the invention is realized in the following way:
the system comprises a dust-blocking filtering and ash-removing device, a back blowing device, a dust collecting device, an ash conveying device and a controller, wherein the system is arranged between a bag-type dust remover and a pretreatment tower;
the bag-type dust collector is connected with a lower air inlet of the dust-blocking filtering ash removal device through a blast furnace gas conveying pipeline, the dust-blocking filtering ash removal device is internally filled with filler, the bottom of the dust-blocking filtering ash removal device is funnel-shaped, and the bottom of the dust-blocking filtering ash removal device is connected with the ash conveying device through an ash conveying pipeline; the upper part of the dust-blocking filtering ash-cleaning device is connected to the back blowing device through a back blowing system conveying pipeline, and the lower part of the dust-blocking filtering ash-cleaning device is connected with the dust collecting device through a dust collecting conveying pipeline; the blast furnace gas after the treated furnace dust content reaches the set index requirement enters a pretreatment tower through a blast furnace gas conveying pipeline; the controller is in communication connection with the dust blocking, filtering and cleaning device, the back blowing device, the dust collecting device and the ash conveying device;
the inside packing section of dust blocking filtering ash removal device sets up two-layer structure at least, and the particle diameter of packing from bottom to top reduces in proper order, sets up certain interval between each layer of packing section, and every interval position all is equipped with the back-blowing intake pipe.
Further, the inside of the dust-blocking filtering ash removal device is divided into different filler sections by arranging a plurality of supporting beams, the supporting beams are porous plates or mesh plates, the structures can be annular, saddle-shaped, grid plates, saddle-shaped meshes, corrugated meshes, spherical, cylindrical, polygonal and the like, the supporting beams are used for supporting the filler, and meanwhile, the air flow can be ensured to uniformly enter the filler layer, and the circulation speed of the air flow is not obviously accelerated. The packing of each packing segment may be random packing and/or structured packing; the supporting beam is made of stainless steel or polymer materials. The upper part of each layer of filling section is provided with a loading hole, and the lower part is provided with a bottom unloading hole.
Furthermore, the upper part of each layer of filler section in the dust-blocking filtering ash removal device is provided with a sight glass, so that the filler filling condition can be observed conveniently.
Further, the filler filled in the dust-blocking filtering ash-cleaning device is one or a combination of more of wear-resistant plastics, ceramics, metals and inert solid materials; fillers with light weight, high mechanical strength, large specific surface area, large porosity and high abrasion strength are preferred.
Further, a first pressure sensor and a first dust sensor are arranged at the air inlet of the dust-blocking filtering ash removing device; and a second pressure sensor and a second dust sensor are arranged at the air outlet of the dust-blocking filtering ash-cleaning device.
Further, a temperature sensor is arranged at the air inlet of the pretreatment tower.
Further, according to the number of the pretreatment towers, the number of the pretreatment towers in the system is thatnThen is arranged in paralleln+1 dust-blocking filtering ash-cleaning device, andn≥1。
furthermore, the controller is in communication connection with the sensors, and the controller is a DCS control system or a PLC control system.
The second part of the invention provides a using method of the blast furnace gas fine desulfurization dust-blocking filtering ash-cleaning system, which comprises the following steps:
the method comprises the steps that blast furnace gas to be treated is filtered by a bag dust collector, is conveyed to a dust-blocking filtering ash removing device from the bottom through a blast furnace gas conveying pipeline, furnace dust in the blast furnace gas is filtered through fillers of each layer of filler section in the dust-blocking filtering ash removing device, and enters a pretreatment tower from the top through the blast furnace gas conveying pipeline for dechlorination treatment after the content of the furnace dust reaches a set index requirement, and then enters a subsequent fine desulfurization facility;
the dust-blocking filtering ash-removing device runs for a period of time or determines whether to continue to be put into use according to the inlet and outlet pressure and the dust concentration variation value; when the continuous use condition cannot be met, the controller sends out an instruction, an inlet valve and an outlet valve of the standby dust-blocking filtering ash-removing device are opened, and the inlet valve and the outlet valve of the dust-blocking filtering ash-removing device which are in use are closed;
the shutdown dust-blocking filtering ash-removing device is purged through a back-blowing device, furnace dust in the filler in each filler section is removed, the furnace dust enters the dust collecting device along with the back-blowing through a dust collecting conveying pipeline, and the back-blowing dust-blocking filtering ash-removing device is put into use again in the next period;
the dust blocking, filtering and cleaning device operates for a certain time, and is periodically stopped and opened to a bottom ash bucket valve, and is conveyed into the ash conveying device through an ash conveying pipeline.
Further, the controller is used for monitoring the real-time data of the first pressure sensor, the second pressure sensor, the first dust sensor, the second dust sensor and the temperature sensor in real time, monitoring the operation condition of the dust blocking, filtering and ash removing device in real time, and adjusting the input conditions of the back blowing device, the dust collecting device and the ash conveying device according to the monitoring result.
Compared with the prior art, the invention has the advantages that:
(1) According to the blast furnace gas fine desulfurization dust-resistant filtering ash-removing system, the system is monitored in real time through the first pressure sensor, the second pressure sensor, the first dust sensor and the second dust sensor which are arranged at the inlet and the outlet of the dust-resistant filtering ash-removing device and the temperature sensor which is arranged at the air inlet of the pretreatment tower, and the control system adjusts the operation condition according to the monitored parameters of the inlet and the outlet of the dust-resistant filtering device, so that the time for the furnace dust to enter the pretreatment tower and other follow-up equipment is reduced, the use time of the dechlorinating agent is greatly prolonged, the replacement frequency of the dechlorinating agent is reduced, the use efficiency of the dechlorinating agent is improved, the system resistance is ensured to be within a reasonable range, the corrosion of the back-end equipment is avoided, the safety of gas transportation is improved, and the like.
(2) According to the dust-blocking filtering ash-cleaning device, the non-destructive fillers with different specifications and types and capable of being reused are adopted, the loading quantity and the specification and type of the dust-blocking filtering ash-cleaning device can be adjusted according to the content of furnace dust at the outlet of the bag-type dust collector, the application range is wide, the flexibility is high, the repeated use is realized, secondary treatment caused by filler replacement is avoided, and the running cost and the manufacturing cost of the system are reduced.
(3) The back-blowing device is arranged in the blast furnace gas fine desulfurization dust-blocking filtration ash removal system, so that an off-line ash removal mode can be realized, the forced withdrawal of the system caused by rising of the resistance is avoided, and the stable operation of the system is ensured; and meanwhile, the deposited furnace dust in the filler of the dust-blocking filtering ash-removing device is taken away to the greatest extent, centralized treatment is carried out, the collected furnace dust is reused, the external discharge capacity of the system is reduced, and the economic and social benefits are improved.
(4) In the blast furnace gas fine desulfurization dust-blocking filtering ash-cleaning system, the dust-blocking filtering ash-cleaning device can be arranged according to the actual condition of the site, and the arrangement is flexible and compact, so that the land is saved.
(5) The blast furnace gas fine desulfurization dust-blocking filtration ash removal system adopts the centralized monitoring control of the controller, judges the occurrence of abnormality of the system in time, accurately adjusts the system, does not need manual operation, and greatly reduces the operation cost.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a process flow diagram of a prior art blast furnace gas fine desulfurization process;
FIG. 2 is a schematic diagram of a prior art blast furnace gas fine desulfurization system;
FIG. 3 is a process flow diagram of a blast furnace gas fine desulfurization method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a blast furnace gas fine desulfurization dust-blocking filtration ash removal system according to an embodiment of the invention;
fig. 5 is a schematic structural diagram of a dust-blocking filtering ash-cleaning device according to an embodiment of the invention.
In the figure, a 1-dust-blocking filtering ash removing device, a 101-supporting beam, a 102-loading hole, a 103-unloading hole, a 104-sight glass, a 105-first pressure sensor, a 106-first dust sensor, a 107-second pressure sensor and a 108-second dust sensor, a 2-back blowing device, a 201-back blowing air inlet pipe, a 3-dust collecting device, a 4-ash conveying device, a 5-controller, a 6-bag-type dust remover, a dust collecting device and a dust collecting device,
7-pretreatment tower, 701-temperature sensor, 8-blast furnace gas conveying pipeline, 9-ash conveying pipeline, 10-back blowing system conveying pipeline and 11-dust collecting conveying pipeline.
Detailed Description
In this patent, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in this patent will be understood by those skilled in the art as the case may be.
In the description of this patent, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "transverse," "vertical," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the patent and simplifying the description, and do not indicate or imply that the apparatus or unit to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the patent.
Embodiment one:
as shown in fig. 4, the embodiment provides a blast furnace gas fine desulfurization dust-blocking filtering dust-cleaning system, which comprises a dust-blocking filtering dust-cleaning device 1, a back-blowing device 2, a dust collecting device 3, a dust conveying device 4 and a controller 5, wherein the system is arranged between a bag-type dust remover 6 and a pretreatment tower 7. In the system of the embodiment, 2 dust-blocking filtering ash-cleaning devices are arranged in parallel, and when the system is started, any one of the dust-blocking filtering ash-cleaning devices is in a use state, and the other dust-blocking filtering ash-cleaning device is in a standby state; the back blowing device comprises a back blowing machine, a gas storage tank and a blowing device, wherein the gas storage tank is connected with air (or nitrogen), and the gas pressure is more than or equal to 0.2MPa; the dust collection device comprises a dust collection bag-type dust collector, and the ash conveying device comprises a conveying bin pump and related conveying pipelines.
The cloth bag dust remover is connected with a lower air inlet of the dust-blocking filtering ash removing device through a blast furnace gas conveying pipeline 8, the inside of the dust-blocking filtering ash removing device is filled with filler, the bottom of the dust-blocking filtering ash removing device is in a funnel shape, the filler can adjust the filling amount and filling specification model of the dust-blocking filtering ash removing device according to the content of furnace dust at an outlet of the front-section cloth bag dust remover, and the filler is a reusable nondestructive product with different specification models.
The bottom of the dust-blocking filtering ash removal device 1 is connected with an ash conveying device through an ash conveying pipeline 9; the upper part of the dust-blocking filtering ash-cleaning device is connected to the back blowing device through a back blowing system conveying pipeline 10, and the lower part of the dust-blocking filtering ash-cleaning device is connected with the dust collecting device through a dust collecting conveying pipeline 11; the blast furnace gas after the treated dust content reaches the set index requirement enters the pretreatment tower 7 through the blast furnace gas conveying pipeline 8.
The inside packing section of dust blocking filter ash removal device sets up two-layer structure at least, and the particle diameter of packing from bottom to top reduces in proper order, sets up certain interval between each layer of packing section, and every interval position all is equipped with back-blowing intake pipe 201.
A first pressure sensor 105 and a first dust sensor 106 are arranged at the air inlet of the dust-blocking filtering ash removal device 1; a second pressure sensor 107 and a second dust sensor 108 are arranged at the air outlet of the dust-blocking filtering ash removal device 1; at the same time, a temperature sensor 701 is provided at the inlet of the pretreatment column 7. The controller selects a DCS control system and is in communication connection with the dust blocking, filtering and cleaning device, the back blowing device, the dust collecting device, the ash conveying device and the sensors.
As can be seen from the process flow chart of the blast furnace gas fine desulfurization method shown in fig. 3, compared with the prior art, the system described in this embodiment is disposed between the existing bag-type dust collector and the pretreatment tower, and the operation of the system includes the following steps:
after the blast furnace gas to be treated is filtered by the bag-type dust remover 6, the blast furnace gas is conveyed to the dust-blocking filtering ash removing device 1 from the bottom by the blast furnace gas conveying pipeline 8, furnace dust in the blast furnace gas is filtered by the filler of each layer of filler section in the dust-blocking filtering ash removing device, and after the content of the furnace dust reaches the set index requirement, the blast furnace gas enters the pretreatment tower 7 from the top by the blast furnace gas conveying pipeline 8 for dechlorination treatment, and then enters the subsequent fine desulfurization facility.
The dust-blocking filtering ash-cleaning device 1 runs for a period of time or determines whether to continue to be put into use according to the inlet and outlet pressure and the dust concentration variation value; when the continuous use condition cannot be met, the controller 5 sends out a command, opens the inlet and outlet valves of the standby dust-blocking filtering ash removal device, and closes the inlet and outlet valves of the dust-blocking filtering ash removal device in use; specifically, the controller 5 monitors the real-time data of the first pressure sensor 105, the second pressure sensor 107, the first dust sensor 106, the second dust sensor 108 and the temperature sensor 701 in real time, monitors the operation condition of the dust blocking, filtering and ash removing device 1 in real time, and adjusts the input conditions of the back blowing device 2, the dust collecting device 3 and the ash conveying device 4 according to the monitoring result, thereby reducing the adverse effects of reduction of the using time of the dechlorinating agent caused by the furnace dust entering the pretreatment tower, reduction of the using efficiency of the dechlorinating agent, increase of the system resistance, corrosion of rear-end equipment and the like.
The shutdown dust-blocking filtering ash-removing device is purged through the back-blowing device 2, furnace dust in the filler in each filler section is removed, the furnace dust enters the dust-collecting device 3 along with the back-blowing through the dust-collecting conveying pipeline 11, and the back-blowing dust-blocking filtering ash-removing device is put into use again in the next period.
The dust-blocking filtering ash removing device 1 operates for a certain time, a bottom ash bucket valve is opened periodically, and the dust is conveyed into the ash conveying device 4 through an ash conveying pipeline 9.
Embodiment two:
in this embodiment, as shown in fig. 5, the structure of the dust-blocking filtering ash-cleaning device 1 is refined, and three supporting beams 101 are arranged in the dust-blocking filtering ash-cleaning device 1 to divide the dust-blocking filtering ash-cleaning device into three filler segments, and the supporting beams 101 are porous plates made of stainless steel. The upper part of each layer of filler section is provided with a loading hole 102 for filling filler into the filler section, the lower part is provided with a bottom unloading hole 103 for discharging used filler so as to update the filler, and meanwhile, the upper part of each layer of filler section in the dust-blocking filtering ash-removing device is provided with a sight glass 104 so as to observe the filling condition of the filler.
Finally, it should be noted that the above only illustrates the technical solution of the present invention and is not limiting, and although the present invention has been described in detail with reference to the preferred arrangement, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (5)
1. The blast furnace gas fine desulfurization dust-blocking filtering ash-cleaning system is characterized by comprising a dust-blocking filtering ash-cleaning device (1), a back blowing device (2), a dust collecting device (3), an ash conveying device (4) and a controller (5), wherein the system is arranged between a bag-type dust remover (6) and a pretreatment tower (7);
the bag-type dust collector is connected with a lower air inlet of the dust-blocking filtering ash removal device through a blast furnace gas conveying pipeline (8), the inside of the dust-blocking filtering ash removal device is filled with filler, the bottom of the dust-blocking filtering ash removal device is in a funnel shape, the bottom of the dust-blocking filtering ash removal device is connected with the dust conveying device through a dust conveying pipeline (9), the inside of the dust-blocking filtering ash removal device is divided into different filler sections through the arrangement of a plurality of supporting beams (101), a charging hole (102) is formed above each filler section, and a bottom discharging hole (103) is formed below each filler section; the upper part of the dust-blocking filtering ash-cleaning device is connected to the back blowing device through a back blowing system conveying pipeline (10), and the lower part of the dust-blocking filtering ash-cleaning device is connected with the dust collecting device through a dust collecting conveying pipeline (11); the blast furnace gas after the treated dust content reaches the set index requirement enters a pretreatment tower (7) through a blast furnace gas conveying pipeline (8); the controller is in communication connection with the dust blocking, filtering and cleaning device, the back blowing device, the dust collecting device and the ash conveying device;
the inner filler sections of the dust-blocking filtering ash-cleaning device are at least provided with two layers of structures, the particle sizes of fillers from bottom to top are reduced in sequence, a certain interval is arranged between each layer of filler sections, and a reverse blowing air inlet pipe (201) is arranged at each interval position;
a first pressure sensor (105) and a first dust sensor (106) are arranged at the air inlet of the dust-blocking filtering ash-removing device (1); a second pressure sensor (107) and a second dust sensor (108) are arranged at the air outlet of the dust-blocking filtering ash-removing device (1); a temperature sensor (701) is arranged at the air inlet of the pretreatment tower (7); the controller (5) is in communication connection with the sensors;
the application method of the blast furnace gas fine desulfurization dust-blocking filtering ash-cleaning system comprises the following steps:
after being filtered by a cloth bag dust remover (6), the blast furnace gas to be treated is conveyed to a dust-blocking filtering ash removing device (1) from the bottom through a blast furnace gas conveying pipeline (8), furnace dust in the blast furnace gas is filtered through the filler of each layer of filler section in the dust-blocking filtering ash removing device, and after the content of the furnace dust reaches the set index requirement, the blast furnace gas enters a pretreatment tower (7) from the top through the blast furnace gas conveying pipeline (8) for dechlorination treatment, and then enters a subsequent fine desulfurization facility;
the operation condition of the dust-blocking filtering ash removal device (1) is monitored in real time by a controller (5) through real-time data of a first pressure sensor (105), a second pressure sensor (107), a first dust sensor (106), a second dust sensor (108) and a temperature sensor (701), and whether the dust-blocking filtering ash removal device is continuously put into use is determined according to inlet and outlet pressure and a dust concentration change value of the dust-blocking filtering ash removal device; when the continuous use condition cannot be met, the controller (5) sends out a command, opens the inlet and outlet valves of the standby dust-blocking filtering ash-removing device, and closes the inlet and outlet valves of the dust-blocking filtering ash-removing device in use; the input conditions of the back blowing device (2), the dust collecting device (3) and the ash conveying device (4) are adjusted according to the monitoring result;
the shutdown dust-blocking filtering ash-removing device is used for blowing through a back-blowing device (2), furnace dust in the filler in each filler section is removed, the furnace dust enters the dust collection device (3) along with the back-blowing through a dust collection conveying pipeline (11), and the back-blowing dust-blocking filtering ash-removing device is put into use again in the next period;
the dust blocking, filtering and ash removing device (1) operates for a certain time, and is periodically stopped and opened to a bottom ash bucket valve, and is conveyed into the ash conveying device (4) through an ash conveying pipeline (9).
2. The blast furnace gas fine desulfurization dust-resistant filtering and ash-removing system according to claim 1, characterized in that a sight glass (104) is arranged above each layer of filler section in the dust-resistant filtering and ash-removing device (1).
3. The blast furnace gas fine desulfurization dust-resistant filtering and ash-removing system according to claim 1 is characterized in that the filler filled in the dust-resistant filtering and ash-removing device (1) is one or a combination of more of wear-resistant plastics, ceramics and metals.
4. A blast furnace gas fine desulfurization dust-resistant filtering ash-removing system according to any one of claims 1-3, characterized in that n+1 dust-resistant filtering ash-removing devices (1) are arranged in parallel when the number of pretreatment towers in the system is n, and n is more than or equal to 1.
5. The blast furnace gas fine desulfurization dust-resistant filtering ash-cleaning system according to claim 1, characterized in that the controller (5) is a DCS control system or a PLC control system.
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