CN107893143B - Converter gas dry dedusting waste heat recovery system and process - Google Patents
Converter gas dry dedusting waste heat recovery system and process Download PDFInfo
- Publication number
- CN107893143B CN107893143B CN201711365220.4A CN201711365220A CN107893143B CN 107893143 B CN107893143 B CN 107893143B CN 201711365220 A CN201711365220 A CN 201711365220A CN 107893143 B CN107893143 B CN 107893143B
- Authority
- CN
- China
- Prior art keywords
- waste heat
- gas
- looping combustion
- recovery
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a converter gas dry dedusting waste heat recovery system and a converter gas dry dedusting waste heat recovery process, wherein the converter gas dry dedusting waste heat recovery system comprises a flue gas filter (3), a chemical-looping combustion device (6) and a waste heat boiler (7), the chemical-looping combustion device (6) comprises a chemical-looping combustion reaction device (600), an outlet of the flue gas filter (3) is connected with an inlet of the chemical-looping combustion reaction device (600) through a first exhaust pipeline (611), an outlet of the chemical-looping combustion reaction device (600) is connected with a first inlet of the waste heat boiler (7) through a second exhaust pipeline (612), and the chemical-looping combustion reaction device (600) is connected with a recovery pipeline (621) in parallel. The system and the process for recovering the waste heat of the dry dedusting of the converter gas can realize the recovery of sensible heat energy of the converter gas at the temperature of below 900 ℃, realize zero emission of the converter gas, do not need to arrange an explosion venting valve, and can discontinuously treat the converter gas to realize continuous energy supply.
Description
Technical Field
The invention relates to the technical field of flue gas recycling, in particular to a converter gas dry dedusting waste heat recovery system and a converter gas dry purification waste heat recovery process.
Background
Generally, the converter steelmaking cycle is 36 minutes, the oxygen blowing time is 15 minutes, a large amount of high-temperature and high-dust-containing flue gas is generated in the process, the flue gas temperature is 1500-1600 ℃, and the main components of dust are FeO and Fe 2 O 3 CaO and SiO 2 Etc. with dust content up to 80g/m 3 ～150g/m 3 。
Because the converter gas is intermittently generated and has the characteristics of high temperature and high dust content, the dust removal and the waste heat recovery of the converter gas are difficult. In the aspect of dust removal, the existing dust removal technology of the converter diffused coal gas is mainly divided into a wet dust removal system and a dry dust removal system.
The wet dust removing system mainly comprises the parts of flue gas cooling, purification, coal gas recovery, sewage treatment and the like. The wet dedusting system has the following disadvantages: 1. the dust removal efficiency is low, and the content of the treated coal gas is about 50-100 mg/Nm 3 (ii) a 2. The system has large resistance loss and high operation cost; 3. secondary pollution exists, and a large amount of sewage is generated and needs to be treated; 4. the occupied area is large. The dry dedusting system mainly comprises a gasification cooling flue, a steam generator, an electrostatic precipitator and the like, and has obvious advantages compared with the wet dedusting system. 1. The dust removal efficiency is high, and the dust content of the flue gas can be reduced to 5-15 mg/Nm < 3 >; 2. the system has small resistance loss and low operation cost; 3. no secondary pollution and sewage are generated, and the recovered dust can be directly utilized; 4. the floor space is small, and the management and the maintenance are convenient. The dry dedusting system has the defects that explosion hidden danger exists, an explosion venting valve needs to be installed, and large explosion possibly exceeds the bearing range of the explosion venting valve of the electrostatic deduster to explode the electrostatic deduster.
In the aspect of waste heat recovery, the wet dust removal system and the dry dust removal system are not effectively recovered. Especially the sensible heat energy below 900 ℃ for the converter gas output by the gasification cooling flue. The dry dedusting waste heat recovery system of the ceramic filter can solve the problem that converter gas output from the gasification cooling flue enters the ceramic filter for dedusting, and the converter gas after dedusting and purification enters waste heatThe boiler utilizes the sensible heat. However, because the converter gas is generated periodically, the ceramic filter dry dedusting system and the waste heat boiler system can only be used intermittently, namely when the converter gas is generated in the converter oxygen blowing period, and the continuity of the energy supply cannot be ensured. At the same time, when the converter gas O 2 And when the content of CO does not meet the recovery requirement, the CO needs to be diffused, the chemical energy of the converter gas cannot be utilized, and the environmental pollution is caused.
The noun explains:
oxygen carrier: in chemical looping combustion reactions, the solid oxide used to transport oxygen is called an oxygen carrier. Mainly comprises oxygen carriers such as Cu-based, ni-based, fe-based, ca-based and the like. Taking a Cu-based oxygen carrier as an example, cuO is generally taken as an active component, and Al is taken as 2 O 3 、SiO 2 And the like as an inert carrier.
Disclosure of Invention
In order to solve the problem of discontinuity of energy supply, the invention provides a system and a process for recovering the waste heat of dry dedusting of converter gas, which can realize the recovery of the sensible heat energy of the converter gas at the temperature of below 900 ℃, realize zero emission of the converter gas, do not need to be provided with an explosion venting valve, and discontinuously treat the converter gas to realize continuous energy supply.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a converter coal gas dry process dust removal waste heat recovery system, including gas filter, chemical chain combustion equipment and exhaust-heat boiler, chemical chain combustion equipment contains chemical chain combustion reaction device, gas filter's export is connected through first exhaust duct and chemical chain combustion reaction device's entry, chemical chain combustion reaction device's export is connected through second exhaust duct and exhaust-heat boiler's first entry, still be equipped with the recovery pipeline between gas filter and the exhaust-heat boiler, the parallel arrangement of recovery pipeline and chemical chain combustion reaction device.
And a three-way valve is arranged on the first exhaust pipeline, the three-way valve comprises an inlet and two outlets, the inlet end of the recovery pipeline is connected with one outlet of the three-way valve, and the outlet end of the recovery pipeline is connected with a second inlet of the waste heat boiler.
Still be equipped with flue gas analyzer on the first exhaust duct, flue gas analyzer is located between gas filter and the three-way valve, and gas filter's entry end outer joint has the gasification cooling flue that can cool down the flue gas.
The gasification cooling flue is connected with an energy storage device which can store the heat of the flue gas in the gasification cooling flue, an ultrasonic dust removal device is arranged in the gasification cooling flue, the flue gas filter is a ceramic flue gas filter, and a cooling water jacket is arranged outside the chemical-looping combustion reaction device.
The chemical looping combustion equipment further comprises a third exhaust pipeline and a fourth exhaust pipeline, an inlet of the third exhaust pipeline is connected with an air fan, an outlet of the third exhaust pipeline is connected with an outlet of the chemical looping combustion reaction device, an inlet of the fourth exhaust pipeline is connected with an inlet of the chemical looping combustion reaction device, and an outlet of the fourth exhaust pipeline is connected with a first inlet of the waste heat boiler.
And a first valve is arranged on the first exhaust pipeline, a second valve is arranged on the second exhaust pipeline, a third valve is arranged on the third exhaust pipeline, and a fourth valve is arranged on the fourth exhaust pipeline.
The converter gas dry dedusting waste heat recovery system further comprises a gas cooler, a gas holder and a diffusing tower, a first outlet of the waste heat boiler is connected with the diffusing tower through a first smoke exhaust pipeline, a second outlet of the waste heat boiler is connected with an inlet of the gas cooler through a second smoke exhaust pipeline, and an outlet of the gas cooler is connected with an inlet of the gas holder through a third smoke exhaust pipeline.
A converter gas dry purification waste heat recovery process is carried out simultaneously with a converter steelmaking cycle, the converter steelmaking cycle comprises a preparation stage, a blowing stage and a tapping stage which are sequentially arranged, the converter gas dry purification waste heat recovery process adopts the converter gas dry dedusting waste heat recovery system, and the converter gas dry purification waste heat recovery process comprises the following steps:
step 1, in a preparation stage, enabling a first exhaust pipeline between an inlet end of a recovery pipeline and an inlet of a chemical-looping combustion reaction device to be in a closed state;
step 2, in the converting stage, judging whether the flue gas discharged by the flue gas filter meets the recovery standard, and when the flue gas discharged by the flue gas filter meets the recovery standard, only allowing the flue gas discharged by the flue gas filter to enter a waste heat boiler through a recovery pipeline; when the recovery standard can not be met, the flue gas discharged by the flue gas filter enters the chemical looping combustion reaction device through the first exhaust pipeline and is subjected to reduction reaction, and the chemical looping combustion reaction device discharges a reduction gas product into the waste heat boiler through the second exhaust pipeline;
and 3, in the steel tapping stage, enabling a first exhaust pipeline between the inlet end of the recovery pipeline and the inlet of the chemical-looping combustion reaction device to be in a closed state.
In the steps 1 and 3, air is blown into the chemical-looping combustion reaction device from the outlet of the chemical-looping combustion reaction device, the air is in the chemical-looping combustion reaction device and generates oxidation reaction, and the oxidation gas products are discharged from the inlet of the chemical-looping combustion reaction device and enter the waste heat boiler.
The recovery standard is that the volume fraction of CO in the converter gas is more than or equal to 35 percent and O 2 The volume fraction is less than or equal to 2 percent; in step 2, when the recovery standard can be reached, the gas discharged by the waste heat boiler enters a gas cooler and a gas holder in sequence; when the recovery standard can not be met, the gas discharged from the waste heat boiler enters a diffusion tower; in step 1 and step 3, the gas discharged from the waste heat boiler enters a diffusion tower.
The invention has the beneficial effects that: the system and the process for recovering the waste heat of the dry dedusting of the converter gas adopt a chemical looping combustion reaction device, can treat the converter gas with components which do not reach the recovery standard, and can efficiently remove dust in the converter gas by adopting a ceramic filter. The system and the process can recover the sensible heat energy of the converter gas below 900 ℃ and the chemical energy of the diffused gas, and are a novel dry dedusting waste heat recovery system and a novel dry dedusting waste heat recovery process which have the advantages of high dedusting efficiency, less energy consumption in operation, total heat recovery of the gas and zero discharge of the gas.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a converter gas dry dedusting waste heat recovery system.
Fig. 2 is a schematic view of the internal piping structure of the waste heat boiler.
1. A converter; 2. a gasification cooling flue; 3. a flue gas filter; 4. a flue gas analyzer; 5. a three-way valve; 6. a chemical looping combustion device; 7. a waste heat boiler; 8. a gas cooler; 9. a gas holder; 10. a blow-off tower;
501. a first solenoid valve; 502. a second solenoid valve;
600. a chemical looping combustion reaction device; 601. a first valve; 602. a second valve; 603. a third valve; 604. a fourth valve; 605. an air blower; 606. a cooling water jacket;
611. a first exhaust duct; 612. a second exhaust duct; 613. a third exhaust conduit; 614. a fourth exhaust conduit;
621. a recovery pipeline;
701. a first exhaust pipe; 702. a second smoke exhaust duct; 703. and a third smoke exhaust pipeline.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The utility model provides a converter coal gas dry process dust removal waste heat recovery system, including gas filter 3, chemical chain combustion apparatus 6 and exhaust-heat boiler 7, chemical chain combustion apparatus 6 contains chemical chain combustion reaction device 600, gas filter 3's export is through the entry linkage of first exhaust duct 611 with chemical chain combustion reaction device 600, chemical chain combustion reaction device 600's export is through the first entry linkage of second exhaust duct 612 with exhaust-heat boiler 7, still be equipped with recovery pipeline 621 between gas filter 3 and the exhaust-heat boiler 7, recovery pipeline 621 sets up with chemical chain combustion reaction device 600 is parallelly connected, as shown in FIG. 1.
In this embodiment, be equipped with three-way valve 5 on the first exhaust pipe 611, three-way valve 5 contains an entry and two exports, the entry end of recovery pipeline 621 and an exit linkage of three-way valve 5, an export of three-way valve 5 is equipped with second solenoid valve 502, the exit end of recovery pipeline 621 and exhaust-heat boiler 7's second entry linkage, chemical looping combustion reaction device 600's entry can communicate with another export of three-way valve 5, another export of three-way valve 5 is equipped with first solenoid valve 501, the export of smoke filter 3 can communicate with the entry of three-way valve 5. Still be equipped with flue gas analyzer 4 on first exhaust pipe 611, flue gas analyzer 4 is located between smoke filter 3 and the three-way valve 5, and flue gas analyzer 4 can analyze out the composition and the content of smoke filter 3 exhaust flue gas, and the entry end external connection of smoke filter 3 has the gasification cooling flue 2 that can cool down the flue gas.
In this embodiment, the inlet end of the gasification cooling flue 2 is located above the converter 1, a cooling water pipe is arranged in the gasification cooling flue 2, the converter gas firstly enters the gasification cooling flue 2, the pipe wall of the converter gas and the flue indirectly exchanges heat through cooling water, the cooling water pipe of the gasification cooling flue 2 is connected with an energy storage device, the energy storage device is also connected with the waste heat boiler 7, the energy storage device can store the heat of the flue gas in the gasification cooling flue 2, and the energy storage device can store the heat absorbed by the waste heat boiler 7. An ultrasonic ash removal device is further arranged in the gasification cooling flue 2, the flue gas filter 3 is a ceramic flue gas filter, and a cooling water jacket 606 is arranged outside the chemical looping combustion reaction device 600.
The exhaust-heat boiler 7 has two inlets and two outlets, the first inlet of the exhaust-heat boiler 7 is only communicated with the first outlet of the exhaust-heat boiler 7 through a first inner pipe, the second inlet of the exhaust-heat boiler 7 is only communicated with the second outlet of the exhaust-heat boiler 7 through a second inner pipe, that is, the fluid entering from the first inlet of the exhaust-heat boiler 7 can only be discharged from the first outlet of the exhaust-heat boiler 7 but not from the second outlet of the exhaust-heat boiler 7, and the fluid entering from the second inlet of the exhaust-heat boiler 7 can only be discharged from the second outlet of the exhaust-heat boiler 7 but not from the first outlet of the exhaust-heat boiler 7, as shown in fig. 2. When the converter gas reaches the recovery standard, the converter gas directly flows out of the recovery pipeline 621 without passing through the chemical looping combustion reactor, enters the waste heat boiler 7 for heat recovery, and then enters the gas cooler 8 and the gas holder 9 for gas storage after passing through the second smoke exhaust pipeline 702. When the recovery standard is not met, the waste heat enters the waste heat boiler 7 through the second exhaust pipe 612 via the chemical looping combustion reactor, and after the waste heat is recycled, the waste heat enters the diffusion tower 10 through the first exhaust pipe 701 to be discharged.
In this embodiment, the chemical looping combustion device 6 further comprises a third exhaust duct 613 and a fourth exhaust duct 614, an inlet of the third exhaust duct 613 is connected with the air blower 605, an outlet of the third exhaust duct 613 is connected with an outlet of the chemical looping combustion reaction device 600, an inlet of the fourth exhaust duct 614 is connected with an inlet of the chemical looping combustion reaction device 600, and an outlet of the fourth exhaust duct 614 is connected with the first inlet of the waste heat boiler 7, as shown in fig. 1. A first valve 601 is disposed on the first exhaust pipe 611, a second valve 602 is disposed on the second exhaust pipe 612, a third valve 603 is disposed on the third exhaust pipe 613, and a fourth valve 604 is disposed on the fourth exhaust pipe 614. The first valve 601, the second valve 602, the third valve 603, and the fourth valve 604 are all solenoid valves.
In this embodiment, the converter gas dry dedusting waste heat recovery system further includes a gas cooler 8, a gas holder 9 and a diffusion tower 10, a first outlet of the waste heat boiler 7 is connected to the diffusion tower 10 through a first smoke exhaust pipe 701, a second outlet of the waste heat boiler 7 is connected to an inlet of the gas cooler 8 through a second smoke exhaust pipe 702, and an outlet of the gas cooler 8 is connected to an inlet of the gas holder 9 through a third smoke exhaust pipe 703, as shown in fig. 1.
The working process of each device in the converter gas dry dedusting waste heat recovery system of the invention is described below.
In converter steelmaking, a large amount of converter gas is generated by blowing oxygen into the converter 1 for decarburization.
When the converter gas passes through the gasification cooling flue 2, the converter gas exchanges heat with cooling water in the flue, and the cooling water absorbs heat and evaporates into saturated steam; and the saturated steam generated by the gasification cooling flue 2 and the water vapor generated by the waste heat boiler 7 are output to the steam energy storage device.
The converter gas output from the gasification cooling flue 2 enters a flue gas filter 3 (a ceramic filter) for dust removal; and the dust collected by the flue gas filter 3 is conveyed to a briquetting station through a conveyor, and the dust is formed through hot pressing, so that the obtained powder block is used for converter steelmaking. The ceramic filter removes dust from converter gas containing dust through screening, and performs back-blowing dust removal when excessive dust is deposited on the outer surface of the ceramic filter and dust removal resistance is too large.
After entering the waste heat boiler 7, the converter gas is subjected to indirect heat exchange with water in the waste heat boiler 7, and meanwhile, the water in the waste heat boiler 7 absorbs heat to form steam.
The converter gas is cooled by a waste heat boiler, and then enters a gas cooler 8 for further cooling and then enters a gas holder 9 for storage. Or the converter gas is cooled by a waste heat boiler and then enters the diffusing tower 10 to be diffused.
The chemical looping combustion reaction apparatus 600 is filled with a metal oxygen carrier. The metal oxygen carrier is one or a mixture of Cu-based oxygen carrier and Fe-based oxygen carrier. The metal oxygen carrier as described may be Fe 2 O 3 A mixture of an Fe-based oxygen carrier as a main component and a Cu-based oxygen carrier containing CuO as a main component; the mass of the Cu-based oxygen carrier accounts for 5-20% of the total mass of the metal oxygen carrier. A cooling water jacket 606 is provided in the outer shell of the chemical looping combustion reaction device 600.
The adiabatic reaction temperature rise of the oxidation reaction of the metal oxygen carrier mainly comprising the Fe-based oxygen carrier is large, and in the invention, the cooling water jacket 606 is additionally arranged on the chemical looping combustion reaction device and used for stabilizing the temperature of the reactor so as to avoid the damage of the metal oxygen carrier caused by the temperature surge.
The devices in the converter gas dry dedusting waste heat recovery system can adopt the existing devices, such as a chemical looping combustion reaction device 600, a gasification cooling flue 2, an ultrasonic deashing device, a cooling water jacket 606, an energy storage device and the like.
The following is a dry purification waste heat recovery process for converter gas.
The converter gas dry purification waste heat recovery process and the converter steelmaking cycle are carried out simultaneously, the converter steelmaking cycle comprises a preparation stage, a blowing stage and a tapping stage which are sequentially arranged, one converter gas dry purification waste heat recovery process corresponds to three stages of the converter steelmaking cycle one by one, the converter gas dry purification waste heat recovery process adopts the converter gas dry dedusting waste heat recovery system, and the converter gas dry purification waste heat recovery process comprises the following steps:
step 1, in the preparation stage, a first exhaust pipeline 611 positioned between an inlet end of a recovery pipeline 621 and an inlet of a chemical-looping combustion reaction device 600 is in a closed state;
step 2, in the converting stage, judging whether the flue gas discharged by the flue gas filter 3 meets the recovery standard, and when the flue gas discharged by the flue gas filter 3 meets the recovery standard, only entering the waste heat boiler 7 through a recovery pipeline 621; when the recovery standard cannot be met, the flue gas discharged by the flue gas filter 3 enters the chemical looping combustion reaction device 600 through the first exhaust pipeline 611 and undergoes a reduction reaction, and the chemical looping combustion reaction device 600 discharges a reduction gas product into the waste heat boiler 7 through the second exhaust pipeline 612;
and 3, in the steel tapping stage, enabling the first exhaust pipe 611 positioned between the inlet end of the recovery pipe 621 and the inlet of the chemical looping combustion reaction device 600 to be in a closed state.
In step 1 and step 3, air is blown into the chemical looping combustion reaction device 600 from the outlet of the chemical looping combustion reaction device 600, the air undergoes an oxidation reaction in the chemical looping combustion reaction device 600, and the oxidation gas product is discharged from the inlet of the chemical looping combustion reaction device 600 and enters the waste heat boiler 7. The dry purification waste heat recovery process for the converter gas can realize the recovery of sensible heat energy of the converter gas at the temperature of below 900 ℃, realize zero emission of the converter gas, avoid the arrangement of an explosion venting valve, and realize continuous energy supply by discontinuously treating the converter gas.
As the process of the waste heat recovery process of the dry purification of the converter gas corresponds to the three stages of the steelmaking cycle of the converter one by one, the process of the waste heat recovery of the dry purification of the converter gas also correspondingly and sequentially reciprocates circularly along with the cyclic reciprocation of the steelmaking cycle of the converter.
The converter gas dry purification waste heat recovery process of the invention is described in detail below by taking an example of a converter steelmaking cycle of 36 min.
Assuming that the converter steelmaking cycle is 36min, wherein 0 min-10 min is a preparation stage before blowing, 10 min-26 min is a blowing stage, wherein 12 min-24 min is a gas recovery stage, and 26 min-36 min is a tapping stage, the converter gas dry purification waste heat recovery process comprises the following steps:
step 1, in a preparation stage, corresponding to 0-10 min in 36min of a steelmaking cycle, no converter gas is generated, the chemical looping combustion reaction device 600 is switched to an oxidation reaction process, the first electromagnetic valve 501 is closed, the first valve 601 and the second valve 602 are closed, the third valve 603 and the fourth valve 604 are opened, and meanwhile, the air fan 605 is opened. At this time, an oxidation reaction occurs in the chemical looping combustion reaction apparatus 600:
Cu+1/2O 2 ＝CuO△H＝-35.971kcal/mol
2Fe 3 O 4 +1/2O 2 ＝3Fe 2 O 3 △H＝-57.776kcal/mol
2FeO+1/2O 2 ＝Fe 2 O 3 △H＝-66.403kcal/mol
the temperature of the oxidation reaction is 900-1000 ℃, and the product of the oxidation gas is N 2 And the gas enters a waste heat boiler 7, in the waste heat boiler 7, the oxidizing gas product and water exchange heat indirectly, the temperature of the converter gas is reduced to 150-200 ℃, and the water absorbs heat and then turns into steam to enter a steam packet. The oxidation gas product is evacuated through a purge column 10.
And 2, in the blowing stage, correspondingly 10-26 min in 36min of the steelmaking cycle, blowing oxygen for decarburization in the converter 1 to generate a large amount of converter gas, wherein the temperature of the output converter gas is about 1500 ℃, the high-temperature dust-containing converter gas firstly enters the gasification cooling flue 2, the converter gas and the pipe wall of the flue exchange heat indirectly through cooling water, the temperature of the gas is reduced from 1500 ℃ to 900 ℃, and the cooling water absorbs heat and evaporates into saturated steam. The converter gas at 900 ℃ enters a flue gas filter 3 for dust removal.
The converter gas dedusted by the ceramic filter is judged whether to reach a recovery standard through a flue gas analyzer 4, if the converter gas reaches the recovery standard (such as the volume fraction or the mole fraction of CO in the converter gas is more than or equal to 35% and the volume fraction or the mole fraction of O2 is less than or equal to 2%), the time period of 12min to 24min in a 36min steelmaking cycle is generally the time period, namely the gas recovery stage, a second electromagnetic valve 502 on the recovery side of a three-way valve 5 is opened, a first electromagnetic valve 501 on the emission side is closed, the converter gas discharged by a flue gas filter 3 directly enters a waste heat boiler 7 through a recovery pipeline 621, the converter gas and the water indirectly exchange heat in the waste heat boiler 7, the temperature of the converter gas is further reduced to 150 ℃ to 200 ℃, and the water is changed into water vapor after absorbing heat and then enters a steam packet. Then, the converter gas enters a gas cooler 8, is cooled to 70 ℃ from 150-200 ℃, and then enters a gas holder 9 for storage.
If the converter gas discharged from the flue gas filter 3 cannot meet the recovery standard (for example, the volume fraction of CO in the converter gas is not less than 35% or the volume fraction of O2 is not more than 2%), which is generally within the first 2min and the second 2min of the blowing stage, the second electromagnetic valve 502 on the recovery side of the three-way valve 5 is closed, the first electromagnetic valve 501 on the emission side is opened, the first valve 601 and the second valve 602 are opened, the third valve 603 and the fourth valve 604 are closed, and the converter gas enters the chemical looping combustion reaction apparatus 600. In the chemical looping combustion reaction device 600, the converter gas and the metal oxide undergo a reduction reaction:
3Fe 2 O 3 +CO＝2Fe 3 O 4 +CO 2 △H＝-9.768kcal/mol
Fe 2 O 3 +CO＝2FeO+CO 2 △H＝-1.163kcal/mol
CuO+CO＝Cu+CO 2 △H＝-31.595kcal/mol
the temperature of the reduction reaction is 900 ℃ to 1000 ℃, and the product CO of the reduction gas 2 And the gas enters a waste heat boiler 7, the reduction gas product and water indirectly exchange heat in the waste heat boiler 7, the temperature of the converter gas is further reduced to 150-200 ℃, and the water absorbs heat and then becomes steam to enter a steam packet. The reducing gas product is evacuated via a bleed tower 10。
And 3, in the steel tapping stage, corresponding to 26-36 min in the 36min steel making period, when no converter gas is generated, switching the chemical looping combustion reaction device 600 to the oxidation reaction process, closing the first electromagnetic valve 501, closing the first valve 601 and the second valve 602, opening the third valve 603 and the fourth valve 604, and simultaneously, opening the air fan 605. At this time, an oxidation reaction occurs in the chemical looping combustion reaction apparatus 600:
Cu+1/2O 2 ＝CuO△H＝-35.971kcal/mol
2Fe 3 O 4 +1/2O 2 ＝3Fe 2 O 3 △H＝-57.776kcal/mol
2FeO+1/2O 2 ＝Fe 2 O 3 △H＝-66.403kcal/mol
the temperature of the oxidation reaction is 900-1000 ℃, and the product of the oxidation gas is N 2 And the gas enters a waste heat boiler 7, in the waste heat boiler 7, the oxidizing gas product and water exchange heat indirectly, the temperature of the converter gas is reduced to 150-200 ℃, and the water absorbs heat and then turns into steam to enter a steam packet. The oxidation gas product is evacuated through a purge column 10.
Wherein, the gasification cooling flue 2 is provided with an ultrasonic deashing device to remove the dust on the inner wall, improve the heat exchange coefficient of coal gas-water and increase the recovery amount of steam. Saturated steam generated by the gasification cooling flue 2 and steam generated by the waste heat boiler are output to the steam energy storage device, and the steam energy storage device can be used for a steel-making process and can also be used for heating.
The flue gas filter 3 can be a ceramic filter, the ceramic filter belongs to a high-temperature resistant dust remover, the ceramic filter adopts a pulse dust removal mode, the dust removal efficiency reaches 99.9 percent, and the ceramic filter mainly removes dust from dust-containing coal gas through a screening effect. When the dust on the outer surface of the ceramic filter is excessive and the dust removal resistance is too large, the ceramic filter needs to be subjected to back flushing for dust removal. The ceramic filter adopts a pulse ash removal mode, and the air source is high-temperature high-pressure nitrogen. The dust collected by the ceramic filter is conveyed to a briquetting station by a conveyor, the dust is pressed and formed by adopting a hot briquetting mode, and the formed powder block can be directly used for converter steelmaking.
In addition, the patent is CN 104388627A, published 3, 3 and 4 days 2015, which discloses a converter gas dust removal method and system.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.
Claims (7)
1. The converter gas dry dedusting waste heat recovery system is characterized by comprising a flue gas filter (3), a chemical looping combustion device (6) and a waste heat boiler (7), wherein the chemical looping combustion device (6) comprises a chemical looping combustion reaction device (600), an outlet of the flue gas filter (3) is connected with an inlet of the chemical looping combustion reaction device (600) through a first exhaust pipeline (611), an outlet of the chemical looping combustion reaction device (600) is connected with a first inlet of the waste heat boiler (7) through a second exhaust pipeline (612), a recovery pipeline (621) is further arranged between the flue gas filter (3) and the waste heat boiler (7), and the recovery pipeline (621) is connected with the chemical looping combustion reaction device (600) in parallel;
a three-way valve (5) is arranged on the first exhaust pipeline (611), the three-way valve (5) comprises an inlet and two outlets, the inlet end of the recovery pipeline (621) is connected with one outlet of the three-way valve (5), and the outlet end of the recovery pipeline (621) is connected with a second inlet of the waste heat boiler (7);
the chemical looping combustion device (6) further comprises a third exhaust pipeline (613) and a fourth exhaust pipeline (614), an inlet of the third exhaust pipeline (613) is connected with an air fan (605), an outlet of the third exhaust pipeline (613) is connected with an outlet of the chemical looping combustion reaction device (600), an inlet of the fourth exhaust pipeline (614) is connected with an inlet of the chemical looping combustion reaction device (600), and an outlet of the fourth exhaust pipeline (614) is connected with a first inlet of the waste heat boiler (7).
2. The system for recovering the waste heat in the dry dedusting of the converter gas according to the claim 1, characterized in that a flue gas analyzer (4) is further arranged on the first exhaust duct (611), the flue gas analyzer (4) is located between the flue gas filter (3) and the three-way valve (5), and a gasification cooling flue (2) capable of cooling the flue gas is connected to the outside of the inlet end of the flue gas filter (3).
3. The converter gas dry dedusting waste heat recovery system according to claim 2, characterized in that the gasification cooling flue (2) is connected with an energy storage device, the energy storage device can store the heat of the flue gas in the gasification cooling flue (2), an ultrasonic ash removal device is arranged in the gasification cooling flue (2), the flue gas filter (3) is a ceramic flue gas filter, and a cooling water jacket (606) is arranged outside the chemical looping combustion reaction device (600).
4. The system for recovering the waste heat of the dry dedusting of the converter gas according to the claim 1, wherein a first valve (601) is arranged on the first exhaust pipeline (611), a second valve (602) is arranged on the second exhaust pipeline (612), a third valve (603) is arranged on the third exhaust pipeline (613), and a fourth valve (604) is arranged on the fourth exhaust pipeline (614).
5. The converter gas dry dedusting waste heat recovery system according to claim 1, further comprising a gas cooler (8), a gas holder (9) and a diffusing tower (10), wherein a first outlet of the waste heat boiler (7) is connected with the diffusing tower (10) through a first smoke exhaust pipeline (701), a second outlet of the waste heat boiler (7) is connected with an inlet of the gas cooler (8) through a second smoke exhaust pipeline (702), and an outlet of the gas cooler (8) is connected with an inlet of the gas holder (9) through a third smoke exhaust pipeline (703).
6. A converter gas dry purification waste heat recovery process is characterized in that the converter gas dry purification waste heat recovery process and a converter steelmaking cycle are carried out simultaneously, the converter steelmaking cycle comprises a preparation stage, a blowing stage and a tapping stage which are sequentially arranged, the converter gas dry purification waste heat recovery process adopts the converter gas dry dedusting waste heat recovery system of any one of claims 1 to 5, and the converter gas dry purification waste heat recovery process comprises the following steps:
step 1, in a preparation stage, enabling a first exhaust pipeline (611) between an inlet end of a recovery pipeline (621) and an inlet of a chemical-looping combustion reaction device (600) to be in a closed state;
step 2, in the converting stage, judging whether the flue gas discharged by the flue gas filter (3) meets the recovery standard, and when the flue gas discharged by the flue gas filter (3) can meet the recovery standard, only entering a waste heat boiler (7) through a recovery pipeline (621); when the recovery standard cannot be met, the flue gas discharged by the flue gas filter (3) enters the chemical looping combustion reaction device (600) through the first exhaust pipeline (611) and is subjected to reduction reaction, and the chemical looping combustion reaction device (600) discharges the reduction gas products into the waste heat boiler (7) through the second exhaust pipeline (612);
step 3, in the steel tapping stage, enabling a first exhaust pipeline (611) between the inlet end of the recovery pipeline (621) and the inlet of the chemical-looping combustion reaction device (600) to be in a closed state;
in the steps 1 and 3, air is blown into the chemical looping combustion reaction device (600) from the outlet of the chemical looping combustion reaction device (600), the air is subjected to oxidation reaction in the chemical looping combustion reaction device (600), and the oxidation gas product is discharged from the inlet of the chemical looping combustion reaction device (600) and enters the waste heat boiler (7).
7. The process for recovering the waste heat by dry purification of the converter gas as claimed in claim 6, wherein the recovery standard is that the volume fraction of CO in the converter gas is not less than 35% and O is 2 The volume fraction is less than or equal to 2 percent;
in step 2, when the recovery standard can be met, the gas discharged by the waste heat boiler (7) enters a gas cooler (8) and a gas holder (9) in sequence; when the recovery standard can not be met, the gas discharged from the waste heat boiler (7) enters a diffusing tower (10);
in the step 1 and the step 3, the gas discharged by the waste heat boiler (7) enters a diffusing tower (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711365220.4A CN107893143B (en) | 2017-12-18 | 2017-12-18 | Converter gas dry dedusting waste heat recovery system and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711365220.4A CN107893143B (en) | 2017-12-18 | 2017-12-18 | Converter gas dry dedusting waste heat recovery system and process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107893143A CN107893143A (en) | 2018-04-10 |
| CN107893143B true CN107893143B (en) | 2023-01-13 |
Family
ID=61807616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711365220.4A Active CN107893143B (en) | 2017-12-18 | 2017-12-18 | Converter gas dry dedusting waste heat recovery system and process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107893143B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108517387B (en) * | 2018-05-24 | 2020-04-07 | 武汉钢铁有限公司 | Converter gas purification and waste heat recovery system |
| DE102019212314A1 (en) * | 2019-03-11 | 2020-09-17 | Sms Group Gmbh | Device and method for cooling and / or cleaning a process gas emerging from a converter |
| CN110628982A (en) * | 2019-11-14 | 2019-12-31 | 北京博鹏中科环保科技有限公司 | LT dry dedusting system and LT dry dedusting method |
| CN112877499B (en) * | 2021-02-25 | 2023-09-19 | 中冶南方工程技术有限公司 | Converter flue gas treatment system based on dry dedusting and operation method thereof |
| CN112941264B (en) * | 2021-03-24 | 2023-10-27 | 中冶南方工程技术有限公司 | Dry type converter flue gas purification and waste heat recovery system and method |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962884A (en) * | 2006-12-07 | 2007-05-16 | 昆明阳光数字技术股份有限公司 | Dry-method dust collection and surplus energy recovery device for steel-smelting converter flue gas |
| CN201593054U (en) * | 2010-01-21 | 2010-09-29 | 江苏百斯特环境工程有限公司 | Converter coal gas excess heat integrated recovery and utilization system |
| CN103614509A (en) * | 2013-12-04 | 2014-03-05 | 无锡雪浪环境科技股份有限公司 | Carbon steel converter dry cloth bag dust removal process and device capable of recovering waste heat in whole process |
| CN204153781U (en) * | 2014-06-30 | 2015-02-11 | 北京科技大学 | Emission coal gas utilizes system |
| CN104388627A (en) * | 2014-11-20 | 2015-03-04 | 中冶南方工程技术有限公司 | Dust removing method for coal gas of converter and system |
| CN104745762A (en) * | 2015-04-14 | 2015-07-01 | 东北大学 | Dry-dedusting and waste heat recovering system and method for intermediate-temperature converter coal gas |
| CN204752784U (en) * | 2015-06-17 | 2015-11-11 | 中冶南方工程技术有限公司 | Converter coal gas processing system |
| CN105112602A (en) * | 2015-09-06 | 2015-12-02 | 山东钢铁集团日照有限公司 | All-dry-method converter smoke waste heat and coal gas recycling device and method |
| CN105299652A (en) * | 2014-06-30 | 2016-02-03 | 北京科技大学 | Diffused gas utilizing system and method |
| CN106755718A (en) * | 2016-12-12 | 2017-05-31 | 山西致业工程设计有限公司 | The fume waste heat that pneumatic steelmaking is produced is utilized and dust removal integrated system and technique |
| CN106855237A (en) * | 2017-01-23 | 2017-06-16 | 北京联力源科技有限公司 | The burning chemistry chains system and its operation method of emission coal gas |
| CN107337179A (en) * | 2017-08-09 | 2017-11-10 | 北京京诚泽宇能源环保工程技术有限公司 | The preparation system and method for a kind of gas-based shaft kiln also Primordial Qi |
| CN107447072A (en) * | 2017-09-29 | 2017-12-08 | 四川德胜集团钒钛有限公司 | A kind of steelmaking converter flue gas dust collecting system |
| CN207760375U (en) * | 2017-12-18 | 2018-08-24 | 北京京诚泽宇能源环保工程技术有限公司 | A kind of dry dedusting of converter residual neat recovering system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010141629A1 (en) * | 2009-06-02 | 2010-12-09 | Thermochem Recovery International, Inc. | Gasifier having integrated fuel cell power generation system |
-
2017
- 2017-12-18 CN CN201711365220.4A patent/CN107893143B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962884A (en) * | 2006-12-07 | 2007-05-16 | 昆明阳光数字技术股份有限公司 | Dry-method dust collection and surplus energy recovery device for steel-smelting converter flue gas |
| CN201593054U (en) * | 2010-01-21 | 2010-09-29 | 江苏百斯特环境工程有限公司 | Converter coal gas excess heat integrated recovery and utilization system |
| CN103614509A (en) * | 2013-12-04 | 2014-03-05 | 无锡雪浪环境科技股份有限公司 | Carbon steel converter dry cloth bag dust removal process and device capable of recovering waste heat in whole process |
| CN105299652A (en) * | 2014-06-30 | 2016-02-03 | 北京科技大学 | Diffused gas utilizing system and method |
| CN204153781U (en) * | 2014-06-30 | 2015-02-11 | 北京科技大学 | Emission coal gas utilizes system |
| CN104388627A (en) * | 2014-11-20 | 2015-03-04 | 中冶南方工程技术有限公司 | Dust removing method for coal gas of converter and system |
| CN104745762A (en) * | 2015-04-14 | 2015-07-01 | 东北大学 | Dry-dedusting and waste heat recovering system and method for intermediate-temperature converter coal gas |
| CN204752784U (en) * | 2015-06-17 | 2015-11-11 | 中冶南方工程技术有限公司 | Converter coal gas processing system |
| CN105112602A (en) * | 2015-09-06 | 2015-12-02 | 山东钢铁集团日照有限公司 | All-dry-method converter smoke waste heat and coal gas recycling device and method |
| CN106755718A (en) * | 2016-12-12 | 2017-05-31 | 山西致业工程设计有限公司 | The fume waste heat that pneumatic steelmaking is produced is utilized and dust removal integrated system and technique |
| CN106855237A (en) * | 2017-01-23 | 2017-06-16 | 北京联力源科技有限公司 | The burning chemistry chains system and its operation method of emission coal gas |
| CN107337179A (en) * | 2017-08-09 | 2017-11-10 | 北京京诚泽宇能源环保工程技术有限公司 | The preparation system and method for a kind of gas-based shaft kiln also Primordial Qi |
| CN107447072A (en) * | 2017-09-29 | 2017-12-08 | 四川德胜集团钒钛有限公司 | A kind of steelmaking converter flue gas dust collecting system |
| CN207760375U (en) * | 2017-12-18 | 2018-08-24 | 北京京诚泽宇能源环保工程技术有限公司 | A kind of dry dedusting of converter residual neat recovering system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107893143A (en) | 2018-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107893143B (en) | Converter gas dry dedusting waste heat recovery system and process | |
| CN109794146B (en) | Grate-rotary kiln SNCR/SCR denitration and active coke desulfurization combined system and process | |
| CN108579369B (en) | Coke oven flue gas multi-pollutant cooperative treatment system and method | |
| CN106984169B (en) | Denitration system and method directly utilizing heat of sinter | |
| CN201574162U (en) | Converter flue gas complementary-energy generating system with gas combustion device | |
| CA2490429A1 (en) | Low emission thermal plant | |
| CN107034335A (en) | A kind of process system and method to ultra-clean dedusting of flue gas of converter | |
| CN101144111A (en) | Technique and combined system for removing dust from steelmaking convertor smoke by dry method and reusing waste heat | |
| CN107754580B (en) | Method for segmenting sintering flue gas and treating flue gas pollutants by using blast furnace | |
| CN209828672U (en) | Grate-rotary kiln SNCR/SCR denitration and active coke desulfurization combined system | |
| CN102878822A (en) | Device and method for purifying and recycling furnace gas of hermetic ore smelting furnace | |
| CN101892344B (en) | Dry dedusting system for converter gas and using method thereof | |
| CN107447072A (en) | A kind of steelmaking converter flue gas dust collecting system | |
| CN203355549U (en) | Dust removing system for silicon manganese alloy airtight electric stove | |
| CN110117684A (en) | A kind of blast furnace gas pressure swing adsorption purge system and method | |
| CN104388627A (en) | Dust removing method for coal gas of converter and system | |
| CN108707718A (en) | It is a kind of using high temperature coal gas of converter and to improve the device and its application method of calorific value | |
| CN102676734A (en) | Converter gas waste heat recovery device and method | |
| CN210287399U (en) | Steelmaking converter primary flue gas particulate matter repurification system | |
| CN207760375U (en) | A kind of dry dedusting of converter residual neat recovering system | |
| CN206814805U (en) | A kind of process system to ultra-clean dedusting of flue gas of converter | |
| CN107051076B (en) | A kind of waste gas recovery technology of silicon carbide smelting | |
| CN209386336U (en) | A kind of electricity generation boiler tail flue gas Integrated Processing Unit based on high-temperature dust removing device | |
| CN113945099A (en) | Electric furnace flue gas waste heat utilization method and system | |
| CN105603148B (en) | Pure the dry-method bag-type dust collecting system and technique of steelmaking converter flue gas heat recovery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |