CN106755718A - The fume waste heat that pneumatic steelmaking is produced is utilized and dust removal integrated system and technique - Google Patents
The fume waste heat that pneumatic steelmaking is produced is utilized and dust removal integrated system and technique Download PDFInfo
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- CN106755718A CN106755718A CN201611140978.3A CN201611140978A CN106755718A CN 106755718 A CN106755718 A CN 106755718A CN 201611140978 A CN201611140978 A CN 201611140978A CN 106755718 A CN106755718 A CN 106755718A
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- waste heat
- heat boiler
- flue gas
- gas
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- 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
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- 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
- C21C2100/00—Exhaust gas
- C21C2100/02—Treatment of the exhaust gas
-
- 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
- C21C2100/00—Exhaust gas
- C21C2100/06—Energy from waste gas used in other processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
Abstract
Utilized and dust removal integrated system and technique the invention provides the fume waste heat that a kind of pneumatic steelmaking is produced, system includes that waste heat boiler is used to carry out dedusting to the flue gas that pneumatic steelmaking is produced and produces superheated steam using fume waste heat, its flue gas side entrance is connected with pneumatic steelmaking through input channel with gasification cooling flue, steam side outlet is connected with the steam inlet of steam turbine, and water side entrance connects with waste heat boiler water supply source；The fume side outlet of deduster, smoke inlet and waste heat boiler, coal-gas recovering is diffused subsystem, is connected with the exhanst gas outlet of deduster.Technique includes that flue gas enters in waste heat boiler, is fed water with the waste heat boiler into waste heat boiler and exchanged heat, and after heat exchange, flue gas enters deduster dedusting, then enters back into coal-gas recovering and diffuses subsystem, and waste heat boiler feedwater becomes superheated steam and enters in steam turbine.The present invention improves pneumatic steelmaking energy efficiency indexes, and the thermal efficiency is high, improves deduster service life, and small, high efficiency is invested in convenient maintenance.
Description
Technical field
The present invention relates to fume waste heat recycling field, produced in converter steelmaking process in more particularly to a kind of Ferrous Metallurgy
Raw fume waste heat is utilized and dust removal integrated system and technique.
Background technology
In pneumatic steelmaking industrial production, it is anti-to there is chemical combination in the oxygen that the carbon in converter in molten iron is sprayed into converter with oxygen rifle
Should, substantial amounts of carbon monoxide and a small amount of carbon dioxide and minimal amount of other oxides are produced, then sprayed from converter mouth
Go out, these gases are referred to as furnace gas；Because oxygen rifle sprays into oxygen flow, slag, evaporation and splash part gold are stirred vigorously
Category oxide impurity and bulk raw materials dust spray with furnace gas together, and these materials are referred to as stove dirt.Furnace gas is gone out after fire door
It is flue gas.Pneumatic steelmaking produce flue gas the characteristics of be：Temperature is high, tolerance is more, dustiness is big, and gas has toxicity and blast
Property, is allowed to diffuse and pollutes the environment.Converter gas and flue dust take on a different character, different according to the processing mode for being used,
The smoke property of gained is also different.
Current processing mode has two kinds of combustion method and unburned method：
(1), combustion method：When furnace gas is from fire door into the petticoat pipe connected with fire door, it is made to mix with enough air, making can
Combustion flammability forms high-temp waste gas, after high-temp waste gas are through supercooling, purification, in being drawn and diffuse air by blower fan.
(2), unburned method：When furnace gas discharge fire door enters the petticoat pipe connected with fire door, air is set to try one's best by control few
Into furnace gas, therefore, combustible component CO only has a small amount of burning in furnace gas.After through supercooling, purification, it is pumped into by blower fan and reclaims system
It is stored up in system, is used.
Compared with combustion method, flue gas unburned in unburned method, its small volume, temperature is low, and the particle of flue dust is thick for unburned method,
It is easy to purification, flue gas recoverable, small investment.Converter current steel-making uses unburned method.In this processing mode of unburned method
In, there are two kinds of processing methods：Wet method (abbreviation OG methods) and dry method (abbreviation LT methods).
(1), wet method：After gasification cooling flue cooling down, temperature drops to 900 to converter gas by 1450 DEG C~1400 DEG C
DEG C -1000 DEG C or so, enter the efficient spray scrubbing tower of particular design by high temperature non-metal expansion joint, it is scrubbed cooling, thick
After dedusting, flue gas is changed into saturated flue gas, and temperature is down to 70 DEG C or so, and obtains rough dedusting.
Flue gas (coal gas of converter) of saturation after cooling rough dedusting enters adjustable throat inlet Venturi tube (dedusting Venturi tube), can
Aditus laryngis Venturi tube is adjusted to use circular seam Venturi tube, Wen's management and control tobacco curing gas velocity makes high velocity air carry out refined dedusting by aditus laryngis.
65 DEG C or so are down to by the flue-gas temperature after dedusting Venturi tube refined dedusting, the saturated flue gas after purification are entered by 90 ° of bend pipes
The essence dehydration of swirling flow dehydrator, meets recovered flue gas and is utilized into converter gas recovery system through pipeline into blower fan, does not meet
Recovered flue gas deliver to diffusing chimney ignition bleeding.
Dust-laden can reach 50mg/Nm after wet dedusting3, not only water consumption is big, in addition it is also necessary to sewage and mud are processed, to environment
There is certain pollution.
(2), dry method：LT dry method dusts are cold by devaporizer through gasification cooling flue cooling down rear converter flue gas
But lower the temperature with after rough dedusting, refined dedusting is carried out into electrostatic precipitator, qualified coal gas is sent to by switching station after refined dedusting
Gas chamber, it is underproof to be diffused by stack ignition.
Dust-laden can reach 20mg/Nm after dry method dust3, dry method be not required to set sewage, mud-processing equipment.
No matter wet method or dry method are all that 900 DEG C of -1000 DEG C of flue gases are cooled by water, high-temperature flue gas sensible heat wave
Fei Liao.
The content of the invention
In order to solve the problems, such as that high-temperature flue gas sensible heat present in prior art is wasted, one aspect of the present invention provides one kind
The fume waste heat that a kind of pneumatic steelmaking is produced is utilized and dust removal integrated system, and it includes：Waste heat boiler, steam turbine, deduster
Subsystem is diffused with coal-gas recovering；The waste heat boiler is used to carry out dedusting to the flue gas that pneumatic steelmaking is produced and is given up using flue gas
Heat produces superheated steam, and the flue gas side entrance of the waste heat boiler is connected with pneumatic steelmaking through input channel with gasification cooling flue
Logical, steam side outlet is connected with the steam inlet of the steam turbine, and water side entrance connects with waste heat boiler water supply source；It is described to remove
Dirt device is used to carry out dedusting, the smoke inlet of the deduster and the waste heat boiler to the flue gas of waste heat boiler discharge
Fume side outlet, the coal-gas recovering is diffused subsystem and is connected with the exhanst gas outlet of the deduster, is wanted to meeting to reclaim
The flue gas asked is reclaimed, and the flue gas that requirement is reclaimed to not meeting carries out ignition bleeding.
In integral system as described above, it is preferable that the waste heat boiler includes：Including furnace wall, drum and edge
Flue gas flow direction is successively set on superheater in the burner hearth surrounded by the furnace wall, evaporator and economizer, and the drum is located at
The top of the waste heat boiler；Waste heat boiler feedwater is entered in the economizer by the water side entrance, the waste heat pot after preheating
Stove feedwater enters in the evaporator through the drum, and heat absorption becomes saturated vapor, then is exported through the drum, subsequently into institute
State in superheater, superheated steam is become by flue gas, then discharged by the steam side outlet.
In integral system as described above, it is preferable that the waste heat boiler also includes：Storage heater；The storage heater
Air intake the saturated vapor for coming from evaporator to receive, the venthole of the storage heater and the mistake are connected with the drum
The air intake connection of hot device.
In integral system as described above, it is preferable that the waste heat boiler also includes：Assisted combustion device；It is described
Assisted combustion device is arranged on the input channel, makes to become into the saturated vapor in the superheater for burning fuel
Superheated steam.
In integral system as described above, it is preferable that the fuel be coal gas of converter, the assisted combustion device with
The coal-gas recovering diffuses subsystem to receive coal gas of converter.
In integral system as described above, it is preferable that along side from the inside to the outside on the inwall of the input channel
To setting gradually refractory layer and heat insulation layer.
In integral system as described above, it is preferable that the water side entrance exports with the exhaust steam of the steam turbine and connects
It is logical.
Another aspect of the present invention provides a kind of fume waste heat produced using above-mentioned pneumatic steelmaking using with dedusting integrally
The technique of change system, it includes：Make the flue gas that pneumatic steelmaking is produced successively through the pneumatic steelmaking gasification cooling flue and institute
Input channel is stated to be entered in the waste heat boiler by the top of the waste heat boiler；Waste heat boiler feeds water by the waste heat boiler
Bottom enters in the waste heat boiler, and and flue gas heat exchange, become superheated steam, then discharged by the top of the waste heat boiler
And the steam turbine is delivered to drive the steam turbine power generation；Flue gas after heat exchange is gone forward side by side by waste heat boiler bottom discharge
Enter the deduster dedusting, obtain the flue gas after dedusting；Diffuse subsystem with the coal-gas recovering is carried out to the flue gas after dedusting
Judge, if meeting RECOVERY OF CONVERTER GAS requirement, store, otherwise ignition bleeding；Wherein, pneumatic steelmaking Vaporizing cooling cigarette
Road covers in the fire door top of converter.
In integral process as described above, it is preferable that the water side that the waste heat boiler feeds water by the waste heat boiler
Entrance enters in the economizer of the waste heat boiler, and the waste heat boiler feedwater after preheating enters institute through the drum of the waste heat boiler
State in the evaporator of waste heat boiler, heat absorption becomes saturated vapor, then is exported through the drum, subsequently into the waste heat boiler
In storage heater, then export to the superheater of the waste heat boiler, be heated into superheated steam, be then discharged out to the vapour
In turbine.
In integral process as described above, it is preferable that in the blowing process of the pneumatic steelmaking, saturated vapor is heated
Into the flue gas that the thermal source of superheated steam is produced for pneumatic steelmaking；In the non-blowing process of the pneumatic steelmaking, saturated vapor is heated
Thermal source into superheated steam is to start the heat energy that burning fuel is formed by assisted combustion device.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
1st, the fume afterheat produced in pneumatic steelmaking production process, the cigarette that can be removed in pneumatic steelmaking production process can be reclaimed
Gas dust, the requirement wider of exhaust gas volumn excursion, up to more than 80%, efficiency of dust collection is up to 99.95% for the thermal efficiency.
The 2nd, one waste heat boiler is set before deduster, by cigarette temperature drop to less than 200 DEG C so that carry for follow-up refined dedusting
On the basis of fume treatment temperature, it is ensured that the thermal safety of deduster, deduster inlet flue gas temperature problem is efficiently solved,
Improve deduster reliability of operation；Dust concentration is also greatly reduced simultaneously, and dust is collected in and waste heat boiler ash port
In the ash bucket of connection, by Geldart-D particle reuse, total efficiency of dust collection is improved；Also produce steaming using heat energy in flue gas simultaneously
Vapour, and be fed directly to steam turbine acting and generate electricity, thermal energy is into electric energy.Compared with traditional fume treatment, due to flue gas heat
Can be fully utilized, so the system and technique have a high efficiency, the advantages of operating cost is few.
3rd, waste heat boiler uses single channel vertical structure, takes up an area small, characteristics of compact layout, makes existing improvement project by place
Less-restrictive；The modularized design of waste heat boiler so that efficiency high, it is rational in infrastructure, it is not easily blocked, flow resistance is small.
4th, waste heat boiler is provided with assisted combustion device, makes steam, temperature, pressure flow stabilization that waste heat boiler is produced,
Hence into the steam parameter stabilization of steam turbine, generate electricity steady.The blowing later stage can start assisted combustion device, will not meet recovery
Coal gas combustion (of oil) insitu exchanges heat, and improves energy.
Brief description of the drawings
Fig. 1 is that the fume waste heat that a kind of pneumatic steelmaking provided in an embodiment of the present invention is produced is utilized and dust removal integrated system
Structural representation.
Fig. 2 is fume waste heat utilization, generating, the dust removal integrated system of another pneumatic steelmaking provided in an embodiment of the present invention
The structural representation of system.
Mark is described as follows in figure：
1 converter, 2 pneumatic steelmaking gasification cooling flues, 3 input channels, 4 waste heat boilers, 5 dedusters, 51 bag-type dusts
Device, 52 electrostatic precipitator, 41 flue gas side entrances, 42 flue gas side outlets, 43 steam side outlets, 44 water side entrances, 6 axial flow blowers, 7
Triple valve, 8 coal gas cooling subsystems, 9 diffusing chimneys, 10 converter gas cabinets, 11 dust transport subsystems, 12 storage heaters, 13 vapour
Turbine, 14 assisted combustion devices.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Referring to Fig. 1~2, the fume waste heat that one embodiment of the invention provides a kind of pneumatic steelmaking generation is utilized and dedusting one
Body system, it includes that waste heat boiler 4, steam turbine 13, deduster 5 and coal-gas recovering diffuse subsystem.
Waste heat boiler 4 is used to lower the temperature the flue gas that pneumatic steelmaking is produced, exchanges heat and just dedusting, its flue gas side entrance 41
Connected with pneumatic steelmaking gasification cooling flue 2 through input channel 3, the gasification cooling flue 2 covers in the fire door top of converter 1,
Its flue gas side outlet 42 is connected with the smoke inlet of deduster 5, and its steam side outlet 43 connects with the steam inlet 121 of steam turbine 13
Logical, Qi Shui side entrances 44 connect with waste heat boiler water supply source.In order to fully absorb fume waste heat, flue gas is from top to bottom in waste heat
Flowing, i.e. flue gas side entrance 41 are located on the side wall on the top of waste heat boiler 4 in boiler 4, and flue gas side outlet 42 is located at bottom
On the wall of side, the water flowing in waste heat boiler 4 from the bottom to top realizes the heat exchange of flue gas and water, and after heat exchange, water becomes steam entrance
Steam turbine 13, the flue gas after cooling enters deduster 5.Waste heat boiler 4 can also carry out dedusting to flue gas, and (dedusting of waste heat boiler claims
It is first dedusting), the first ash port positioned at its bottom is fallen into by the dust after waste heat boiler just dedusting, then export again.Vapour
Turbine 13 is steam turbine, for mechanical energy to be transformed into electric energy, and is outwards conveyed.Preferably, the exhaust steam of steam turbine 13 goes out
The condensed device of mouth is connected with the water side entrance 44 of waste heat boiler 4 so that the exhaust steam that acting is finished is returned after being condensed into condensed water
Waste heat boiler 4 is exchanged heat with flue gas, i.e. the exhaust steam of steam turbine 13 forms steam-condensation as waste heat boiler water supply source
Water-steam circulation utilizes process so that water resource is recycled.For the ease of conveying, returned after condensed water is pressurized
Waste heat boiler 4 is exchanged heat.Deduster 5 is used to carry out flue gas dedusting (dedusting of deduster is referred to as refined dedusting), removing dust device 5
The dust that dedusting is obtained falls into the second ash port positioned at its bottom, then exports again.By the first ash port export dedusting and
The dedusting of the second ash port output can be delivered to pending place, such as sintering material field or refining through dust transport subsystem 11
, for steel-making utilization, such that it is able to reducing conveying and smelting link, conveying power is excellent for rotary furnace after steel KR desulphurization systems or briquetting
Elect nitrogen as.Coal-gas recovering is diffused subsystem and the component content of the flue gas after the dedusting of deduster 5 is analyzed, if meeting recovery
It is required that (such as oxygen content is less than 1 percent in flue gas, carbon monoxide content higher than 30 percent and less than 90 percent,
Carbon dioxide oxygen content is less than 20 percent, and now flue gas can be described as coal gas of converter), then recycle, otherwise ignition bleeding.
Specifically, satisfactory flue gas is diffused the switching device of subsystem, such as triple valve 7 by coal-gas recovering, and distribution enters coal gas
The converter gas cabinet 10 that subsystem is diffused in recovery is stored, and the coal gas of converter of storage is again by the user that given gas after gas compressor pressurization
Use, it is preferable that after flue gas is through triple valve 7, then through coal-gas recovering diffuse subsystem coal gas cooling subsystem 8 cool down after enter
Converter gas cabinet 10 is stored；Do not meet and reclaim the diffusing chimney that desired flue gas is diffused subsystem by triple valve into coal-gas recovering
9, then through ignition bleeding, igniting can be operated by plasma ignition system.For the ease of the conveying of flue gas after dedusting, in coal-gas recovering
Diffuse setting axial flow blower 6 between subsystem and deduster.Worn and torn by flue gas to take precautions against waste heat boiler 4, the cigarette in waste heat boiler 4
Gas velocity is preferably 3~4m/s.
By setting waste heat boiler 4 before deduster 5, and the steam turbine 13 being connected with waste heat boiler 4 is set so that turn
The sensible heat energy of the flue gas that stove steel-making is produced is able to fully reclaim, and absorbs and shows thermogenetic steam for generating electricity, and produces huge warp
Ji benefit.Flue gas is by after the refined dedusting treatment of the first dust removal process and deduster 5 of waste heat boiler 4, the dustiness of flue gas was both accorded with
Discharge standard is diffused in conjunction, also complies with gas recovery user requirement, and the water content of the flue gas from the discharge of deduster 5 is substantially reduced,
Substantially increase the quality of recovered flue gas.The thermal safety for being set to deduster 5 of other waste heat boiler 4 provides reliable temperature
Degree is ensured.
Specifically, waste heat boiler 4 include furnace wall, drum and be successively set on along flue gas flow direction in burner hearth superheater,
Evaporator and economizer.Drum is located at the top of waste heat boiler 5.Economizer, evaporator and superheater are connected with drum, waste heat
Boiler feedwater is entered in economizer by water side entrance 44, using the relatively low smoke pre-heating of tail temperature, the waste heat boiler after preheating
Feedwater enters in evaporator through drum, and heat absorption becomes saturated vapor, is exported through drum, subsequently into superheater, by flue gas plus
Heat becomes superheated steam, is then discharged by steam side outlet 43, into steam turbine 13.The flue gas entered by flue gas side entrance 41
Up to 800~1000 DEG C, after lowering the temperature through waste heat boiler, flue-gas temperature drops to less than 200 DEG C to temperature.The quantity of evaporator can be
Three groups, it is divided into the first evaporator, the second evaporator and the 3rd evaporator.First evaporator, the second evaporator and the 3rd evaporator
It is successively set in burner hearth along the flow direction of flue gas.
Preferably, the structure of waste heat boiler 4 is single channel vertical structure, and furnace wall is membrane wall furnace wall.Composition economizer, steaming
The heat pipe of hair device and superheater is preferably light pipe to ensure heat exchange efficiency, and is easy to deashing, and light pipe is by seamless steel pipe manufacture
Into.The permutation and combination method of multiple heat pipes of economizer, evaporator and superheater is in-line module array, i.e., horizontally-arranged and vertical setting of types
The arrangement all alignd is reducing smoke flow resistance.Because the pneumatic steelmaking blowing process discharges a large amount of flue gases, non-blowing process flue gas is released
What is put is little, and smoke dust concentration is big, and dust is gathered on the heating surface of heat pipe and can cause that heat-transfer effect is poor, and resistance increases
Greatly, it is that this waste heat boiler also includes shaking deashing device and shock-wave ash-clearing device, blowing process startup shakes deashing device and realizes existing
Line shakes deashing；Non- blowing process (during i.e. following auxiliary combustions starts) starts shock-wave ash-clearing device.Waste heat boiler 4 can be used
Modularization, heap modular system manufacture installation.
Concentrated due to pneumatic steelmaking blowing process exhaust gas volumn and discharged, the non-blowing process almost discharges without flue gas, therefore converter is refined
The flue gas that steel is produced is indirectly discontinuous, and the steam pressure and flowed fluctuation that waste heat boiler 4 is produced are huge, are steady vapour pressure
Power and flow, are additionally provided with storage heater 12 outside waste heat boiler 4, and its air intake to be connected with drum and come from satisfying for evaporator receiving
And steam, its venthole connects with the air intake of superheater, so excess steam can be stored in into storage with peak load shifting, blowing process
In hot device 12, the steam of the non-storage of blowing process storage heater 12 is discharged so that the steam into steam turbine 13 is stable.
In order that steam pressure and flow into steam turbine 13 are more steady, it is ensured that generated output is constant, does not result in
The fluctuation of power load, waste heat boiler 4 also includes assisted combustion device 14, is arranged on the leading portion of waste heat boiler 4, i.e. input channel
On 3, the end of input channel 3 can be arranged on, in later stage in blowing process not gas recovery, starting and burning fuel, made
The steam of the storage of storage heater 12 can still be heated to form superheated steam in superheater and be generated electricity into steam turbine 13, and waste heat boiler
4 can also still produce a small amount of steam, the generating set of the operation of the efficient stable of steam turbine 2, steam turbine 12 is can guarantee that lasting height
Efficiency power generation.Fuel is preferably coal gas of converter, and such as converter gas cabinet 10 is connected with to auxiliary combustion with assisted combustion device 14
Device 14 provides coal gas of converter, and coal gas of converter is burnt, and maximally utilizes RECOVERY OF CONVERTER GAS heat energy.In, auxiliary combustion
Burn device 14 and bessemerizing startup of being lighted a fire when later stage coal gas is not reclaimed, make coal gas of converter energy utilization to greatest extent, treat next time
The auto extinguishing of Primary period assisted combustion device 14, it is ensured that the normal recovery of next coal gas of converter.
When flue gas flows through input channel 2, flue-gas temperature is up to 800~1000 DEG C, and input channel 2 is flowed through in order to reduce flue gas
When the thermal loss that produces, reduce the reduction amplitude of flue-gas temperature, on the inwall of input channel 2 along direction from the inside to the outside successively
Refractory layer and heat insulation layer are set, and the material of refractory layer can be refractory material, it is adiabatic into material can be fine for complex silicate aluminium
Dimension felt.In order to compensate the thermal stretching of input channel, the compensated device of input channel 2 is connected with the flue gas side entrance 41 of waste heat boiler 2,
Compensator is preferably high-temperature resistant corrugated compensator.
Deduster 5 can be sack cleaner 51, and its gas approach is located at bottom, and exhanst gas outlet is located at top, so profit
In the dust removing effects for having reached, extend the service life of sack cleaner 51, simplify operating platform, convenient operation and maintenance.
The shell of sack cleaner 51 is round box (i.e. sack cleaner uses round box structure), and each casing sets several
Filter bag, is provided with keel and is played a supporting role with to filter bag in each filter bag, and is provided with back-blowing device and is made with carrying out purging to filter bag
Dust on filter bag is fallen into the ash silo of the lower section of sack cleaner 51.Due to there is requirement of explosion proof, the medium that back-blowing device is used is
Nitrogen.Casing is provided with explosion-protection equipment and manhole.For the continuity and maintenance that ensure dedusting need, it is provided with sack cleaner 51
Spare tank.
Deduster 5 or electrostatic precipitator 52, its shell are cylindric (i.e. electrostatic precipitator uses cylinder-like structure),
Inlet air flow distributing plate is provided with it, is realized by inlet air flow distributing plate first into the flue gas stream in deduster uniform
Air-flow, then air-flow continue through four electric fields (as shown in Figure 2).It is provided with electrostatic precipitator and shakes deashing device, and is provided with
Explosion-protection equipment.
In order to improve the fume waste heat of pneumatic steelmaking generation using the automaticity and reliability with dust removal integrated system
Property, in order to realize that the fume waste heat that pneumatic steelmaking is produced is utilized and dedusting integration process, the integral system is by DCS
(Distributed control system, collective and distributive type control system) is controlled, and the system operating condition can be supervised
Survey and control；Can the various pictures of display or form (parameter or operating mode)；Operation circle for be provided simultaneously with artificial enquiry, adjustment, intervening
Face.
Another embodiment of the present invention is provided a kind of fume waste heat produced using above-mentioned pneumatic steelmaking and utilized and dedusting one
The technique of body system, specifically includes：
Make the flue gas that pneumatic steelmaking is produced successively through pneumatic steelmaking gasification cooling flue 2 and input channel 3 by waste heat pot
The top of stove enters in waste heat boiler 4；Waste heat boiler feeds water and entered in waste heat boiler by the bottom of waste heat boiler 4, and and flue gas
Heat exchange, becomes superheated steam, is then discharged by the top of waste heat boiler 4 and is delivered to steam turbine 13 and sent out with driving steam turbine 13
Electricity；Flue gas after heat exchange escapes and enter the dedusting of deduster 5 by the bottom of waste heat boiler 4, obtains the flue gas after dedusting；Use coal gas
Recovery is diffused subsystem and the flue gas after dedusting is judged, if meeting RECOVERY OF CONVERTER GAS requirement, is stored, and otherwise igniting is put
Dissipate；Wherein, pneumatic steelmaking gasification cooling flue 2 covers in the fire door top of converter 1.
In order that obtaining blowing process and non-blowing process into the steam stable of steam turbine 12, waste heat boiler feeds water by waste heat boiler
4 water side entrance enters in the economizer of waste heat boiler 4, and the waste heat boiler feedwater after preheating enters through the drum of waste heat boiler 4
In the evaporator of waste heat boiler 4, heat absorption becomes saturated vapor, then is exported through drum, subsequently into the storage heater 12 of waste heat boiler 4
It is interior, then export to the superheater of waste heat boiler 4, superheated steam is heated into, it is then discharged out to steam turbine 13.
In the blowing process of pneumatic steelmaking, the cigarette that the thermal source that saturated vapor is heated into superheated steam is produced for pneumatic steelmaking
Gas；It is to be started by assisted combustion device 14 by the thermal source that saturated vapor is heated into superheated steam in the non-blowing process of pneumatic steelmaking
The heat energy that burning fuel is formed, so further such that into the steam stable of steam turbine.Description on assisted combustion device
Reference can be made to the description on assisted combustion device in above-described embodiment, no longer repeats one by one herein.
In sum, what the present invention brought has the beneficial effect that：
1st, the fume afterheat produced in pneumatic steelmaking production process, the cigarette that can be removed in pneumatic steelmaking production process can be reclaimed
Gas dust, the requirement wider of exhaust gas volumn excursion, up to more than 80%, efficiency of dust collection is up to 99.95% for the thermal efficiency.
The 2nd, one waste heat boiler is set before deduster, by cigarette temperature drop to less than 200 DEG C so that carry for follow-up refined dedusting
On the basis of fume treatment temperature, it is ensured that the thermal safety of deduster, deduster inlet flue gas temperature problem is efficiently solved,
Improve deduster reliability of operation；Dust concentration is also greatly reduced simultaneously, and dust is collected in and waste heat boiler ash port
In the ash bucket of connection, by Geldart-D particle reuse, total efficiency of dust collection is improved；Also produce steaming using heat energy in flue gas simultaneously
Vapour, and be fed directly to steam turbine acting and generate electricity, thermal energy is into electric energy.Compared with traditional fume treatment, due to flue gas heat
Can be fully utilized, so the system and technique have a high efficiency, the advantages of operating cost is few.
3rd, waste heat boiler uses single channel vertical structure, takes up an area small, characteristics of compact layout, makes existing improvement project by place
Less-restrictive；The modularized design of waste heat boiler so that efficiency high, it is rational in infrastructure, it is not easily blocked, flow resistance is small.
4th, waste heat boiler is provided with assisted combustion device, makes steam, temperature, pressure flow stabilization that waste heat boiler is produced,
Hence into the steam parameter stabilization of steam turbine, generate electricity steady.The blowing later stage can start assisted combustion device, will not meet recovery
Coal gas combustion (of oil) insitu exchanges heat, and improves energy utilization, improves the thermal efficiency.
Generally speaking, the invention has the advantages that：Safety, energy-saving and environmental protection, reliability service occupy little space, resistance
It is small, pneumatic steelmaking energy efficiency indexes are improve, the thermal efficiency is high, improves deduster service life, and small, benefit is invested in convenient maintenance
It is high.
As known by the technical knowledge, the present invention can be by other essence without departing from its spirit or the embodiment party of essential feature
Case is realized.Therefore, embodiment disclosed above, for each side, is all merely illustrative, and is not only.Institute
Have within the scope of the present invention or be included in the invention in the change being equal in the scope of the present invention.
Claims (10)
1. the fume waste heat that a kind of pneumatic steelmaking is produced is utilized and dust removal integrated system, it is characterised in that the integration system
System includes：Waste heat boiler, steam turbine, deduster and coal-gas recovering diffuse subsystem；
The waste heat boiler is used to carry out dedusting to the flue gas that pneumatic steelmaking is produced and produces superheated steam, institute using fume waste heat
The flue gas side entrance for stating waste heat boiler is connected with pneumatic steelmaking through input channel with gasification cooling flue, steam side outlet with it is described
The steam inlet connection of steam turbine, water side entrance connects with waste heat boiler water supply source；
The deduster is used to carry out dedusting to the flue gas of waste heat boiler discharge, the smoke inlet of the deduster with it is described
The fume side outlet of waste heat boiler；
The coal-gas recovering is diffused subsystem and is connected with the exhanst gas outlet of the deduster, and the flue gas that requirement is reclaimed to meeting is carried out
Reclaim, the flue gas that requirement is reclaimed to not meeting carries out ignition bleeding.
2. integral system according to claim 1, it is characterised in that the waste heat boiler includes：Including furnace wall, drum
And superheater in the burner hearth surrounded by the furnace wall, evaporator and economizer, the vapour are successively set on along flue gas flow direction
Bag is positioned at the top of the waste heat boiler；
Waste heat boiler feedwater is entered in the economizer by the water side entrance, and the waste heat boiler after preheating feeds water through the drum
Into in the evaporator, heat absorption becomes saturated vapor, then is exported through the drum, subsequently into the superheater, by cigarette
Gas heating becomes superheated steam, is then discharged by the steam side outlet.
3. integral system according to claim 2, it is characterised in that the waste heat boiler also includes：Storage heater；
The air intake of the storage heater connects the saturated vapor for coming from evaporator to receive with the drum, the storage heater
Venthole is connected with the air intake of the superheater.
4. integral system according to claim 3, it is characterised in that the waste heat boiler also includes：Auxiliary combustion is filled
Put；
The assisted combustion device is arranged on the input channel, for the saturation that burning fuel makes to enter in the superheater
Steam becomes superheated steam.
5. integral system according to claim 4, it is characterised in that the fuel is coal gas of converter, the auxiliary combustion
Device is burnt to diffuse subsystem to receive coal gas of converter with the coal-gas recovering.
6. integral system according to claim 1, it is characterised in that on the inwall of the input channel along by it is interior extremely
Outer direction sets gradually refractory layer and heat insulation layer.
7. integral system according to claim 1, it is characterised in that the exhaust steam of the water side entrance and the steam turbine
Outlet.
8. the fume waste heat that the pneumatic steelmaking described in a kind of use claim 1 is produced is using the work with dust removal integrated system
Skill, it is characterised in that the technique is specifically included：
Make the flue gas that pneumatic steelmaking is produced successively through the pneumatic steelmaking gasification cooling flue and the input channel by described
The top of waste heat boiler enters in the waste heat boiler；
Waste heat boiler feeds water and entered in the waste heat boiler by the bottom of the waste heat boiler, and and flue gas heat exchange, become overheat
Steam, is then discharged and is delivered to the steam turbine to drive the steam turbine power generation by the top of the waste heat boiler；
Flue gas after heat exchange escapes and enter the deduster dedusting by the waste heat boiler bottom, obtains the flue gas after dedusting；
Subsystem is diffused with the coal-gas recovering to judge the flue gas after dedusting, if meeting RECOVERY OF CONVERTER GAS requirement,
Storage, otherwise ignition bleeding；
Wherein, the pneumatic steelmaking gasification cooling flue covers in the fire door top of converter.
9. integral process according to claim 8, it is characterised in that the waste heat boiler feedwater is by the waste heat boiler
Water side entrance enter in the economizer of the waste heat boiler, the feedwater of waste heat boiler after preheating through the waste heat boiler drum
Into in the evaporator of the waste heat boiler, heat absorption becomes saturated vapor, then is exported through the drum, subsequently into the waste heat
In the storage heater of boiler, then export to the superheater of the waste heat boiler, be heated into superheated steam, be then discharged out to
In the steam turbine.
10. integral process according to claim 8, it is characterised in that in the blowing process of the pneumatic steelmaking, by saturation
Steam is heated into the flue gas that the thermal source of superheated steam is produced for pneumatic steelmaking；
It is to be opened by assisted combustion device by the thermal source that saturated vapor is heated into superheated steam in the non-blowing process of the pneumatic steelmaking
The heat energy that dynamic burning fuel is formed.
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| CN107164599A (en) * | 2017-06-23 | 2017-09-15 | 中冶赛迪技术研究中心有限公司 | A kind of high-temperature combustible gas body residual neat recovering system and method |
| CN107190120A (en) * | 2017-07-19 | 2017-09-22 | 沈志军 | The technique and system of steel scrap are heated using converter gas |
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| CN110331251A (en) * | 2019-07-30 | 2019-10-15 | 中国科学院力学研究所 | A kind of post-processing of converter gas and waste-heat recovery device |
| CN114636316A (en) * | 2022-03-14 | 2022-06-17 | 苏州海陆重工股份有限公司 | Waste heat recovery system matched with HISMELT smelting reduction iron-making system |
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| CN110331251A (en) * | 2019-07-30 | 2019-10-15 | 中国科学院力学研究所 | A kind of post-processing of converter gas and waste-heat recovery device |
| CN110331251B (en) * | 2019-07-30 | 2023-12-12 | 中国科学院力学研究所 | Converter gas aftertreatment and waste heat recovery device |
| CN114636316A (en) * | 2022-03-14 | 2022-06-17 | 苏州海陆重工股份有限公司 | Waste heat recovery system matched with HISMELT smelting reduction iron-making system |
| CN114636316B (en) * | 2022-03-14 | 2024-01-26 | 苏州海陆重工股份有限公司 | Waste heat recovery system matched with HISMELT smelting reduction ironmaking system |
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Effective date of registration: 20190410 Address after: 100070 Beijing Fengtai Science City Haiying Road 9-7 Building 2-4 Patentee after: Beijing Teda Qingyuan Energy Technology Co., Ltd. Address before: 030009 Two Blocks, One Unit 1903, Block B, Liuxi Building, 182 Beijie Street, Xinghualing District, Taiyuan City, Shanxi Province Patentee before: Shanxi Industrial Engineering Design Co., Ltd. |