CN102538497B - Method and device for recovery and full-effect utilization of flue gas thermal energy of steel converter - Google Patents
Method and device for recovery and full-effect utilization of flue gas thermal energy of steel converter Download PDFInfo
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- CN102538497B CN102538497B CN2012100515066A CN201210051506A CN102538497B CN 102538497 B CN102538497 B CN 102538497B CN 2012100515066 A CN2012100515066 A CN 2012100515066A CN 201210051506 A CN201210051506 A CN 201210051506A CN 102538497 B CN102538497 B CN 102538497B
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Abstract
The invention discloses a method and a device for recovery and full-effect utilization of flue gas thermal energy of a steel converter. The method disclosed by the invention is implemented by a system which consists of a system switching device, an afterburning combustion apparatus, a high-temperature flue gas vaporization cooling device, a kindling catching and heat-exchanging device, a flue gasflameout and heat-exchanging device, a secondary coal economizer, a bag dust collector, a primary coal economizer, a gas pressure device and a three-way switching device. According to the method and the device disclosed by the invention, the process step in a sweeping period of a non-steel-making period is increased, the intermittent type production of superheated steam of the device for recovering the flue gas thermal energy of the converter is changed into continuous type production, and a stable working energy source is provided for waste heat power generation. According to the method and the device disclosed by the invention, three types of superheated steams of 10, 3.89 and 0.6MPa are produced, the average power generation steam consumption is only 4.3T/103.kwh, and the thermal energy recovery efficiency is 2 times that of the prior art; the thermal energy conversion efficiency is 1.86 to 2.79 times that of the prior art; the comprehensive power generation capacity is 7.44 to 11.16 times that of the prior art; and the sensible heat recovery efficiency is increased from 37.5 percent to 94.3 percent, and is 2.5 times that of the prior art. According to the method and the devicedisclosed by the invention, the steel-making energy consumption is effectively reduced, and a technical basis is established for realizing 'negative energy steel-making'.
Description
Technical field
The invention belongs to the steelmaking equipment technical field, be specifically related to a kind of steelmaking converter high-temperature flue gas energy recovery based on LT converter coal gas purification recovery technology and utilize method and device thereof with full the effect.
Background technology
Coal gas of converter is the important secondary energy sources of iron and steel enterprise, and the effective recycling coal gas of converter can not only reduce the STEELMAKING PRODUCTION cost, lays the first stone for realizing " negative energy " steel-making, and can greatly reduce the total emission volumn of steel mill's pollutant, realizes cleaner production.LT converter coal gas purification dry method treatment technology comes from Germany, and this method is utilized the electric field dedusting, and efficiency of dust collection can directly purify the dustiness in the flue gas to 10mg/m up to 99%
3Below, can directly use for the user.And can save huge circulation; The dust briquetting that reclaims can return converter and replace the iron ore utilization; System's resistance is decreased little, saves energy consumption.With regard to environmental protection and energy-conservation with regard to, the LT method is representing the RECOVERY OF CONVERTER GAS technological development direction.But the LT method of prior art also comes with some shortcomings, with regard to process aspect: 1, fault rate height; 2, easy dewfall; 3, venting of dust explosion is frequent; 4, the easy fouling of devaporizer, cleaning maintenance labour intensity is big; 5, need spray into water and nitrogen (steam), be not real dry method dust; 6, dust briquetting system need establish rotary kiln and makes system complex increase consumption; 7, recovery system interrupter duty, variations in temperature are very big, and the thermal stress of each equipment is very big, has influenced service life; 8, electrostatic precipitator has electric spark to have the generation that can't stop to explode.The heat energy recycle aspect: 1, thermal storage device generation steam is low-pressure saturated steam, and steam quality is low; 2, the sensible heat of converter gas below 1000 ℃ can't obtain recycling; 3, blowing initial stage and latter stage must stop when the coal gas oxygen content is defective reclaiming, and igniting is diffused, and has lost the latent heat of coal gas; 4, water spray makes that the coal gas of converter water content is big, has reduced the Lower heat value of coal gas of converter.In sum, prior art LT method exists the recovery levels of latent heat and sensible heat low; Steam quality is low; Security of system is poor; The fault rate height, many deficiencies that the maintenance of clean-up work is powerful.The RECOVERY OF CONVERTER GAS of China overwhelming majority steel mill utilizes effect all undesirable, and by 2008, ton steel coal-gas recovering amount on average only was 60m
3About/t, differ greatly with external advanced level, therefore the coal-gas recovering technology is grasped in digestion as early as possible, and fully excavating equipment potential improves the RECOVERY OF CONVERTER GAS level safely and efficiently, has become the common issue that domestic most steel mill faces.The inventor has developed a kind of steelmaking converter high-temperature flue gas energy recovery based on LT converter coal gas purification recovery technology and has utilized method and device thereof with full the effect through concentrating on studies for many years for this reason, and evidence is respond well.
Summary of the invention
The object of the present invention is to provide a kind of technology easy, safe and reliable, can effectively improve high-temperature flue gas energy recovery efficient, raising steam quality and realization are supplied with continuously, utilize method based on steelmaking converter high-temperature flue gas energy recovery and the full effect of LT converter coal gas purification recovery technology; Second purpose of the present invention is to provide a kind of device of realizing said method.
First purpose of the present invention is to realize like this, comprise that state conversion, flue deashing and afterburning, kindling material capture and heat exchange, flue gas stop working and heat exchange, flue gas bag-type dust, low-temperature flue gas energy recovery, coal gas pressurization, coal gas cooling, toxic emission operation, its feature specifically comprises:
A, blowing period, system's switching device shifter is opened high-temperature flue, and the afterburning burner quits work, and high-temperature flue gas is by the high-temperature flue blister cooler, and the high-temperature flue gas that will produce in the blowing process is cooled to 900-1000 ℃, and reclaims heat energy and produce superheated steam;
B, the flue gas after step cooling enter kindling material and capture and heat-exchanger rig, remove the bulky grain kindling material in the converter gas, and flue gas is carried out thick dedusting; Heat-exchanger rig further reclaims the heat energy in the flue gas and produces superheated steam simultaneously;
C, process kindling material capture and the flue gas of heat-exchanger rig enters the flame-out and heat-exchanger rig of flue gas, and the naked light in the flue gas is extinguished, and heat-exchanger rig further reclaims the heat energy in the flue gas and produces superheated steam;
D, the flue gas temperature after the heat exchange of secondary economizer after flame-out are reduced to about 150 ℃, send into dedusting in the bag-type dust collector then, and qualified coal gas is sent into the coal gas storage cabinet again after temperature is reduced to 60 ℃ after the heat exchange of one-level economizer; Defective coal gas directly is delivered to smoke stack emission;
E, converter purge the phase, system's switching device shifter is with the high-temperature flue shutoff, the afterburning burner is started working, burner sprays into high-velocity combustion under air-breathing in the high-temperature flue with coal gas, the high-temperature flue gas that produces carries out high speed to each service aisle in the stove and purges, and fully reclaims heat energy and produces superheated steam through the described operation of A ~ D successively; Surplus waste gas after dedusting is through smoke stack emission.
Second purpose of the present invention is achieved in that and comprises system's switching device shifter, afterburning burner, high-temperature flue gas apparatus for vapour-cooling, kindling material capture and heat-exchanger rig, flame-out heat-exchanger rig, secondary economizer, sack cleaner, one-level economizer, gas compressor, the threeway switching device shifter of reaching of flue gas; Described system switching device shifter, afterburning burner are set in turn in fixedly on the petticoat pipe, and the high-temperature flue gas apparatus for vapour-cooling on the afterburning burner connects kindling material capture and heat-exchanger rig successively, flue gas is flame-out and heat-exchanger rig, secondary economizer, sack cleaner, one-level economizer and three-way switch valve.
The present invention worked by the purging phase that system's switching mechanism and afterburning burner have increased the non-steel-making phase, became pneumatic steelmaking batch production superheated steam and was Sequential Production, for steam turbine power generation provides the stable work energy.Realized the efficient operation of heat reclaiming system and equipment.What produce is superheated steam, than the low-temperature saturated steam generating efficiency height that prior art produces, and the saturated vapor of 0.6～1.2MPa, the generating steam consumption is 8～12 tons/10
3Kwh; System of the present invention can produce 10,3.89, three kinds of superheated steams of 0.6MPa, and the steam consumption of on average generating electricity is 4.3T/10
3Kwh.Energy recovery efficient is 2 times of prior art LT method; Its conversion efficiency of thermoelectric is 1.86～2.79 times; Add the steam-electric power amount that non-steel-making phase afterburning coal gas produces, the comprehensive electric generating ability is 7.44～11.16 times of prior art.The inventive method not consume water, do not consume steam, do not have igniting to diffuse loss and to the influence of environment, do not need coke-stove gas or other igniter fuel.High-temperature flue gas purges technology, and assurance system no dust stratification in service, nothing are leaked, and long service life has reduced the maintenance and repair expense significantly.Sensible heat organic efficiency of the present invention brings up to 94.3% by 37.5% of prior art, is 2.5 times of prior art; Effectively reduce the steel-making energy consumption, established technical foundation for realizing " negative can steel-making ".
Description of drawings
Accompanying drawing concerns schematic diagram for overall structure of the present invention.
Among the figure: 1-system switching device shifter, 2-afterburning burner, 3-high-temperature flue gas apparatus for vapour-cooling, the 4-kindling material captures and heat-exchanger rig, 5-primary superheater, 6-two-stage superheater, flame-out and the heat-exchanger rig of 7-flue gas, 8-secondary economizer, 9-gas compressor, 10-sack cleaner, 11-one-level economizer, the 12-flow measurement device, 13-oxygen-eliminating device, 14-1
#Drum, 15-2
#Drum, 16-three-way switch valve, 17-executing agency, 18-attemperation of steam device, 19-wear-resistant device, 20-explosion-protection equipment, 21-water compensating valve, the explosion-proof non-return valve of 22-; The a-gas entry, b-ash disposal passage, the outlet of c-dry powder ash, the outlet of d-superheated steam, e-boiler feedwater mouth, f-gas exit, g-chimney, h-air outlet, i-water seal water supplement port, j-water seal explosion-protection equipment interface.
The specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing and embodiment, but never in any form the present invention is limited, and any change or improvement based on training centre of the present invention is done all belong to protection scope of the present invention.
As shown in Figure 1, the inventive method comprises state conversion, flue deashing and afterburning, kindling material capture and heat exchange, flue gas is flame-out and heat exchange, flue gas bag-type dust, low-temperature flue gas energy recovery, coal gas pressurization, coal gas cooling, toxic emission operation, and its feature specifically comprises:
A, blowing period, system's switching device shifter is opened high-temperature flue, and the afterburning burner quits work, and high-temperature flue gas is by the high-temperature flue blister cooler, and the high-temperature flue gas that will produce in the blowing process is cooled to 900-1000 ℃, and reclaims heat energy and produce superheated steam;
B, the flue gas after step cooling enter kindling material and capture and heat-exchanger rig, remove the bulky grain kindling material in the converter gas, and flue gas is carried out thick dedusting; Heat-exchanger rig further reclaims the heat energy in the flue gas and produces superheated steam simultaneously;
C, process kindling material capture and the flue gas of heat-exchanger rig enters the flame-out and heat-exchanger rig of flue gas, and the naked light in the flue gas is extinguished, and heat-exchanger rig further reclaims the heat energy in the flue gas and produces superheated steam;
D, the flue gas temperature after the heat exchange of secondary economizer after flame-out are reduced to about 150 ℃, send into dedusting in the bag-type dust collector then, and qualified coal gas is sent into the coal gas storage cabinet again after temperature is reduced to 60 ℃ after the heat exchange of one-level economizer; Defective coal gas directly is delivered to smoke stack emission;
E, converter purge the phase, system's switching device shifter is with the high-temperature flue shutoff, the afterburning burner is started working, burner sprays into high-velocity combustion under air-breathing in the high-temperature flue with coal gas, the high-temperature flue gas that produces carries out high speed to each service aisle in the stove and purges, fully reclaim heat energy and produce superheated steam through the described operation of A ~ D successively, the surplus waste gas after dedusting is through smoke stack emission.
Described kindling material captures and heat-exchanger rig comprises the two-stage steam superheater, and namely smoke inlet is membranous wall formula steam superheater, is used for capturing bulky grain kindling material and energy recovery; Be that the steam superheater of vapor channel is to improve steam quality for tube side in the exhanst gas outlet pipeline.
Described purging phase high velocity air is the flue gas after the gas-fired, and oxygen content＜2% helps to reach better explosion-proof technology effect.
As shown in drawings, apparatus of the present invention comprise system's switching device shifter 1, afterburning burner 2, high-temperature flue gas apparatus for vapour-cooling 3, kindling material capture and heat-exchanger rig 4, flame-out heat-exchanger rig 7, secondary economizer 8, sack cleaner 10, one-level economizer 11, gas compressor 9, the threeway switching device shifter 16 of reaching of flue gas; Described system switching device shifter 1, afterburning burner 2 are set in turn in fixedly on the petticoat pipe, and the high-temperature flue gas apparatus for vapour-cooling 3 on the afterburning burner 2 connects successively that kindling material captures and heat-exchanger rig 4, flue gas is flame-out and heat-exchanger rig 7, secondary economizer 8, sack cleaner 10, one-level economizer 11 and three-way switch valve 16.
Described system switching device shifter 1 is split embedded groove type flue state switching device for being arranged on the fixing petticoat pipe.The open and close of described system switching device shifter 1 are interlocked mutually with the lifting of oxygen rifle, the oxygen rifle descends, steel-making beginning valve open, flap is pulled to outside the flue, valve is not subjected to the heating of high-temperature flue gas, improve the condition of work of valve, can not change the flow field of original device high-temperature flue gas simultaneously, improved the security of system's operation.Steel-making finishes, and the oxygen rifle is mentioned valve interlocking close simultaneously, and this valve becomes the furnace bottom of coal combustion gas boiler again, and temperature is relatively low.
Described afterburning burner 2 is the clearance type gas burner, is provided with coal gas and combustion air passage.The alternate passage by separately of coal gas and combustion air enters diffusion combustion in the gasification cooling flue.Because the coal gas that burns is to handle through deep purifying, dust content is extremely low (less than 10mg/Nm
3), the high-temperature flue gas that this moment burning produces, the dust that can adhere on the heating surface when reclaiming coal gas is removed.Make heating surface remain cleaning.Be to guarantee flame degree of filling in the blister cooler, burner be installed on blister cooler around can not be less than four, combustion system arranges the adjustable combustion fan of revolution, reduces the pollution of environment with the oxygen content of control flue gas.
Described kindling material captures and the inlet end of heat-exchanger rig 4 is the high speed whirlwind deduster that inwall arranges heat-exchanger rig; described heat-exchanger rig is membrane type, wall type or solid matter tubular type steam superheater; its efficiency of dust collection can reach about 90%; the outlet meso-position radius is 8.6 μ m; both can be used as the bulky grain kindling material and captured, played the effect of thick dedusting again.Arrange solid matter tubular type steam superheater on its flue gas fairlead inwall, produce the superheated steam of high, normal, basic three kinds of different pressures.
Described flue gas stops working and heat-exchanger rig 7 is the air-flowing type heat-exchanger rig, and tube shell type structure, tube side are exhaust gases passes, and shell side is heat transferring medium, utilizes the High Speed Airflow Within knock down the flame.
Described heat-exchanger rig top arranges wear-resistant device 19, avoids abrasion with the protection heat exchanger, reaches durable and purpose safety anti-explosive, helps simultaneously to prevent that the heat-exchanger rig top from accumulating dust.
Described kindling material captures and heat-exchanger rig 4 and the flame-out heat-exchanger rig 7 connecting pipe peaks that reach of flue gas, and/or between sack cleaner 10 and the one-level economizer 11 on the pipeline, and/or the explosion-protection equipment interface is set respectively after the one-level economizer 11, connect explosion-protection equipment 20.
One place's explosion-protection equipment interface is set on the pipeline between described secondary economizer 8 and the gas compressor 9 at least, and connects explosion-protection equipment 20.
Described explosion-protection equipment 20 is the hydrolock explosion-protection equipment, and described hydrolock explosion-protection equipment is the U-shaped tubular construction, and water compensating valve 21 and explosion-proof non-return valve 22 are set on it.The explosion-protection equipment of other structures can be realized purpose of the present invention equally.
Described burning coal gas derives from the mixed gas of purified converter gas, blast furnace gas or blast furnace gas and coke-stove gas.
Dust content＜10mg/Nm after the described sack cleaner dedusting
3
Described economizer is shell-and-tube heat exchanger, and tube side is gas passage, and shell side is water stream channel, can stop the coal gas generation gas poisoning that leaks.The cooling water of shell side is supplied with by generating set steam turbine recirculated cooling water, after the heat exchange of gas cooler heat exchanger, recycles after returning the cooling of Turbo-generator Set recirculating cooling water system.
Behind the described one-level economizer gas compressor is set, is in negative pressure state before making gas compressor, be in barotropic state after adding press, bleed, improve the yield of coal gas to prevent air, prevent blast.
Described gas compressor is sent the coal gas that reclaims into the coal gas gas holder in the blowing process; The flue gas introducing smoke stack emission that to burn the back and be lowered the temperature by system in the purging phase.
After the described one-level economizer 11 flow measurement device 12 is set.
Operation principle of the present invention:
Dry method converter gas recovery system is to follow the principle of flue gas cascade utilization, system of the present invention is equivalent to be in series by high, medium and low three grades of steam generator systems, be provided with two cover burners, in the coal-gas recovering phase (blowing process), steelmaking converter is the burner of three boilers.In the non-coal-gas recovering phase (purging phase), by the system's switching device shifter that is located on the fixing petticoat pipe, gasification cooling flue and steelmaking converter are isolated, by being located at the burner of afterburning burner above the fixing petticoat pipe coal gas of converter (or mixed gas of blast furnace gas and coke-stove gas) after with reclaiming clean as three grades of series connection boilers.Namely in the non-coal-gas recovering phase, this system is a gas fired-boiler that is independent of steelmaking system, can send into the coal gas of system by adjustment, adjusts generation load.And be a complete dry method converter gas energy recovery and coal-gas recovering purifier at this device of coal-gas recovering phase, can reclaim the sensible heat of converter gas efficiently, and can be with gas purification to dustiness less than 10mg/Nm
3Directly enter gas holder, install the fuel of non-coal-gas recovering phase (purging phase) for other user with as this.The present invention is switched by system, work by the afterburning burner, make the influence between electricity generation system and the steelmaking system very little, shortened blow-on time, the thermic load of one-period variation is converted into the thermic load of continous-stable, reduce the thermal stress of each heating surface of system of the present invention greatly, prolonged the life-span of system, reduced fault rate.
Flame-out and the heat-exchanger rig of described flue gas, economizer are shell-and-tube heat exchanger.Flue gas is tube side, cooling medium is shell side, has stopped the bleed possibility of flue gas of air, has guaranteed the safe operation of system.
The two-stage dedusting is adopted in the dedusting of system of the present invention, and first order dedusting is captured by kindling material and heat-exchanger rig is finished, and its operation principle is high temperature cyclone dust removal, its efficiency of dust collection about 90%.Catch the bulky grain kindling material in dedusting, its dedusting outlet grit meso-position radius is 8.6 μ m, has eliminated to cause one of flammable gas explosion reason, plays explosion-proof effect.Because this converter gas recycle device, what flue gas cooling and energy recovery adopted is wall-type heat exchange, and heat transferring medium does not mix with flue gas, and flue gas can dewfall.Second level dedusting can be finished by sack cleaner, dust content can be dropped to 10mg/Nm as smart dedusting
3Below, can use for other users behind the flue dust collecting.Join as the outlet of the economizer of low pressure evaporator and the entrance of sack cleaner, as long as economizer arranges enough heating surfaces, no matter how evaporated flue import cigarette temperature changes, at this moment just the evaporation capacity of system changes, the inlet flue gas temperature of sack cleaner remains at the low pressure evaporator saturation temperature and adds the temperature-resistant of 20 ℃ of heat transfer temperature differences, can prevent the accident that causes cloth bag to burn because of sack cleaner inlet flue gas temperature fluctuation overtemperature.System of the present invention does not have big friction and the spark that therefore collision can not produce enough energy to cause flammable gas explosion, has further improved the reliability of system, has reduced the fault rate of system.
In preceding burning phase in blowing process and back burning phase, the coal gas amount of sending into system by adjusting makes the coefficient of excess air of system remain on 1.05～0.95 generations that can reduce NO significantly, the environment that reduced pollution protection.
Heat-exchanger rig of the present invention all adopts the indirect heat exchange mode, flue gas does not directly contact mixing with heat transferring medium in the whole heat transfer process, directly entering gas chamber after the coal gas of converter heat exchange cooling uses for the user, can stop coal gas dewfall in heat exchanger and deduster, cause heat exchanger and deduster fouling and collection mud, reduce fault rate, reduced the labour intensity of safeguarding and clearing up.
System of the present invention can produce the superheated steam of continuous HTHP, medium temperature and medium pressure and three kinds of parameters of low-temp low-pressure.The heat recovery efficiency of system can be up to 93.6%, and such heat recovery efficiency is higher than the thermal efficiency of China's power system.The quality that has increased substantially recovered steam is used for generating with the steam that the converter gas sensible heat that reclaims and 20% latent heat produce, and the electric weight that sends can satisfy the power consumption of (comprising oxygen generation system) of whole steelmaking system.Therefore it is economically viable carrying out the modified of flue gas and carry out energy recovery with 20% latent heat of recovery coal gas, can prevent from that fuel gas from blasting to have guaranteed the safety of system.Latent heat about 80% collects for other users and uses.
Production scale according to each steel mill is different with operant level, thermal balance according to each factory's steelmaking process, can determine installation parameter and the capacity of each factory's electricity generation system, installed capacity is selected for use according to high temperature, high pressure greater than we of 20MW, middle temperature, middle pressure and low temperature, three kinds of inlet conditions of low pressure make the electricity generation system efficiency of thermal cycle greater than 35% efficiency of thermal cycle far above the saturated vapor generating.Improve the quality of steam, realized the utilization efficiently of institute's producing steam.We select the Turbo-generator Set of middle temperature, middle pressure and low temperature, two kinds of inlet conditions of low pressure for use during less than 20MW in installed capacity, and its efficiency of thermal cycle is also far above the efficiency of thermal cycle of saturated vapor generating.The electric weight that no matter adopts which kind of parameter to send all can satisfy the power consumption that whole steelmaking process comprises oxygen processed.Not only realize negative can steel-making in the theory statistics, and on material object, really accomplish negative can steel-making.For realizing that electric weight that iron and steel enterprise utilizes the waste heat complementary energy that reclaims to send can satisfy the electricity consumption of whole iron and steel enterprise and have a surplus and contribute.
The course of work of the present invention:
Blast for stopping system, the later stage begin by being located at the gas burner on the fixing petticoat pipe in blowing, send into coal gas and air after an amount of purification in the converter gas, control the O in the flue gas
2Composition is lower than 2%, CO and is lower than 1%.When rising movable gas hood, progressively interlocking close is located at the system's switching device shifter on the fixing petticoat pipe, makes system be converted into gas-fired boiler by smoke eliminator.We send into an amount of coal gas and air makes the flue gas oxygen content by system be lower than 2% by control to system in the non-steel-making phase, and control is by the flue gas flow rate of each heating surface of system, be not less than the flue gas flow rate of coal-gas recovering phase, can carry out deashing to each heating surface in the non-blowing process like this and purge.
Blowing early stage along with movable gas hood descends, interlocking is opened the system's switching device shifter that is located on the fixing petticoat pipe, UNICOM's converter and coal-gas recovering purifier, and out-of-blast, the O in the flue gas
2Content stopped to the device gas delivery less than 2% o'clock, finished system of the present invention is reclaimed state to converter gas purification by the boiler operatiopn state conversion.At this moment device reclaims the sensible heat of converter gas, and the dustiness of flue gas is dropped to 10mg/ Nm
3Below, O
2Content is lower than 1%, has guaranteed the recovery quality of coal gas of converter.Early stage is sent into an amount of coal gas and air to the coal gas of converter dust pelletizing system in non-blowing later stage in blowing process and blowing, makes it burn to reach the control flue gas oxygen content and is lower than 2% purpose.And in the coal-gas recovering phase, stop to send into coal gas and air system normally reclaims coal gas to converter gas recovery system.We add an amount of coal gas and air and make flue gas O in the system to system in initial stage of blowing and latter stage of blowing
2Concentration be lower than 2%.In CO in the flue gas and the combustion system airborne 0
2Burning makes CO concentration in flue gas be lower than 1%, and the heat that burning produces reclaims by being located at the back recovery system, so system of the present invention can cancel the igniting diffusion system, can accomplish to reclaim to greatest extent latent heat and the sensible heat of coal gas.The igniting of having stopped blowing initial stage and later stage is diffused and has been reclaimed heat, has reduced environmental pollution, has saved igniter fuel.Can also send into the load that the coal gas amount of system and air capacity can Adjustment System by adjustment, make system loading more stable.
Claims (10)
1. a steelmaking converter flue gas energy recovery and full effect are utilized method, comprise that state conversion, flue deashing and afterburning, kindling material capture and heat exchange, flue gas stop working and heat exchange, flue gas bag-type dust, low-temperature flue gas energy recovery, coal gas pressurization, coal gas cooling, toxic emission operation, its feature specifically comprises:
A, blowing period, system's switching device shifter is opened high-temperature flue, and the afterburning burner quits work, and high-temperature flue gas is by the high-temperature flue blister cooler, and the high-temperature flue gas that will produce in the blowing process is cooled to 900-1000 ℃, and reclaims heat energy and produce superheated steam;
B, the flue gas after step cooling enter kindling material and capture and heat-exchanger rig, remove the bulky grain kindling material in the converter gas, and flue gas is carried out thick dedusting; Heat-exchanger rig further reclaims the heat energy in the flue gas and produces superheated steam simultaneously;
C, process kindling material capture and the flue gas of heat-exchanger rig enters the flame-out and heat-exchanger rig of flue gas, and the naked light in the flue gas is extinguished, and heat-exchanger rig further reclaims the heat energy in the flue gas and produces superheated steam;
D, the flue gas temperature after the heat exchange of secondary economizer after flame-out are reduced to about 150 ℃, send into dedusting in the bag-type dust collector then, and qualified coal gas is sent into the coal gas storage cabinet again after temperature is reduced to 60 ℃ after the heat exchange of one-level economizer; Defective coal gas directly is delivered to smoke stack emission;
E, converter purge the phase, system's switching device shifter is with the high-temperature flue shutoff, the afterburning burner is started working, burner sprays into high-velocity combustion under air-breathing in the high-temperature flue with coal gas, the high-temperature flue gas that produces carries out high speed to each service aisle in the stove and purges, and fully reclaims heat energy and produces superheated steam through the described operation of A ~ D successively; Surplus waste gas after dedusting is through smoke stack emission.
2. steelmaking converter flue gas energy recovery as claimed in claim 1 and full effect are utilized method, it is characterized in that described kindling material captures and heat-exchanger rig comprises the two-stage steam superheater, be that smoke inlet is membranous wall formula steam superheater, be used for capturing bulky grain kindling material and energy recovery; Be that the steam superheater of vapor channel is to improve steam quality for tube side in the exhanst gas outlet pipeline.
3. realize the energy recovery of the described method of claim 1 and imitate use device entirely that its feature comprises system's switching device shifter (1), afterburning burner (2), high-temperature flue gas apparatus for vapour-cooling (3), kindling material capture and heat-exchanger rig (4), flame-out heat-exchanger rig (7), secondary economizer (8), gas compressor (9), sack cleaner (10), one-level economizer (11), the threeway switching device shifter (16) of reaching of flue gas for one kind; Described system switching device shifter (1), afterburning burner (2) are set in turn in fixedly on the petticoat pipe, and the high-temperature flue gas apparatus for vapour-cooling (3) on the afterburning burner (2) connects successively that kindling material captures and heat-exchanger rig (4), flue gas is flame-out and heat-exchanger rig (7), secondary economizer (8), sack cleaner (10), one-level economizer (11) and three-way switch valve (16).
4. energy recovery as claimed in claim 3 and the full use device of imitating is characterized in that described system switching device shifter (1) splits embedded groove type flue state switching device for being arranged on the fixing petticoat pipe.
5. energy recovery as claimed in claim 3 and the full use device of imitating is characterized in that described afterburning burner (2) is the clearance type gas burner, is provided with coal gas and combustion air passage.
6. energy recovery as claimed in claim 3 and effect use device entirely, it is characterized in that described kindling material captures and the inlet end of heat-exchanger rig (4) is the high speed whirlwind deduster that inwall arranges heat-exchanger rig, described heat-exchanger rig is membrane type, wall type or solid matter tubular type steam superheater; Described kindling material captures and heat-exchanger rig flue gas exit arranges solid matter tubular type steam superheater.
7. energy recovery as claimed in claim 3 and the full use device of imitating is characterized in that described flue gas stops working and heat-exchanger rig (7) is the air-flowing type heat-exchanger rig, and tube shell type structure, tube side are exhaust gases passes, and shell side is heat transferring medium; Described heat-exchanger rig top arranges wear-resistant device.
8. energy recovery as claimed in claim 3 and effect use device entirely, it is characterized in that described kindling material captures and heat-exchanger rig (4) and flame-out heat-exchanger rig (7) the connecting pipe peak that reaches of flue gas, and/or between sack cleaner (10) and the one-level economizer (11) on the pipeline, and/or the explosion-protection equipment interface is set respectively after the economizer, connect explosion-protection equipment (20).
9. energy recovery as claimed in claim 3 and the full use device of imitating is characterized in that arranging at least on the pipeline between described secondary economizer (8) and the gas compressor (9) place's explosion-protection equipment interface, and connect explosion-protection equipment (20).
10. energy recovery and the full use device of imitating as claimed in claim 8 or 9, it is characterized in that described explosion-protection equipment (20) is the hydrolock explosion-protection equipment, described hydrolock explosion-protection equipment is the U-shaped tubular construction, and explosion-proof non-return valve (22) and water compensating valve (21) are set on it.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100515066A CN102538497B (en) | 2012-03-01 | 2012-03-01 | Method and device for recovery and full-effect utilization of flue gas thermal energy of steel converter |
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| CN2012100515066A CN102538497B (en) | 2012-03-01 | 2012-03-01 | Method and device for recovery and full-effect utilization of flue gas thermal energy of steel converter |
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| CN103773912B (en) * | 2013-12-30 | 2015-04-08 | 苏州海陆重工股份有限公司 | Waste heat recovery system for ironmaking implemented by using coal direct reduction process |
| CN103925806B (en) * | 2014-04-01 | 2015-09-30 | 南昌江能热动工程技术有限责任公司 | A kind of multichannel back of the body formula integration akali sulphide Converter Residual Heat Boiler device |
| CN104911296B (en) * | 2015-06-17 | 2016-09-21 | 中冶南方工程技术有限公司 | Coal gas of converter processing method and system |
| CN105087854B (en) * | 2015-08-26 | 2017-07-07 | 方瑞 | Converter high-temperature flue gas dry method dust and process waste heat staged reclaimer and method |
| 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 |
| CN108660281A (en) * | 2018-07-12 | 2018-10-16 | 北京京诚科林环保科技有限公司 | A kind of kindling material capturing device |
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| JP3015809B2 (en) * | 1993-12-27 | 2000-03-06 | 新日本製鐵株式会社 | Disturbance correction method for converter pressure control system |
| CN100535565C (en) * | 2006-12-07 | 2009-09-02 | 昆明阳光基业股份有限公司 | Process for recovery of excess energy of flue gas from converter |
| CN100535131C (en) * | 2006-12-07 | 2009-09-02 | 昆明阳光基业股份有限公司 | Dry-method dust collection and surplus energy recovery device for steel-smelting converter flue gas |
| CN101532069B (en) * | 2009-04-14 | 2011-03-16 | 江苏中金环保科技有限公司 | Device for recycling flue gas of steelmaking converters through full-dry purification and process thereof |
| CN101705330A (en) * | 2009-11-23 | 2010-05-12 | 赵本军 | Method for purifying smoke of steel converter and recovering residual heat |
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Effective date of registration: 20170601 Address after: 100089, Beijing, Haidian District Qinghe East Jiayuan, building 836, room 1 Patentee after: Unimax day (Beijing) Technology Co., Ltd. Address before: 650020, room 17, 1307 Yinhai area, China World Trade Center center, Kunming, Yunnan Patentee before: Unimax day (Beijing) Technology Co., Ltd. Kunming branch |