CN1296495C - High wind temperature obtaining method using pure blast furnace gas combustion - Google Patents
High wind temperature obtaining method using pure blast furnace gas combustion Download PDFInfo
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- CN1296495C CN1296495C CNB2004100224738A CN200410022473A CN1296495C CN 1296495 C CN1296495 C CN 1296495C CN B2004100224738 A CNB2004100224738 A CN B2004100224738A CN 200410022473 A CN200410022473 A CN 200410022473A CN 1296495 C CN1296495 C CN 1296495C
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Abstract
The present invention provides a method for obtaining high air temperature by the pure combustion of a high furnace gas. The present invention is characterized in that a ball type hot air furnace (11) of a floor type furnace construction is adopted. Hot air furnace smoke Y is used for preheating combustion air K and a coal gas M used by the hot air furnace through heat pipe exchangers (4) and (5) for the first time. Part of mixed air preheated for the first time is used for the combustion of a prearranged furnace (2), and generated smoke temperature reaches from 900 to 1000 DEG C. The smoke is mixed with the smoke of the hot air furnace and carries out preheating for the second time to combustion air K. The temperature of the combustion air is preheated to 350 to 400 DEG C through a high temperature heat exchanger (3), and the combustion air is transferred to a combustion opening (19) of a ball type hot air furnace. After the combustion air is mixed with a preheated clean gas, a mixed gas enters the combustion chamber (18) and is combusted. High temperature smoke at a temperature of 1300 to 1350 DEG C is generated. Multi-section type ball bed heat storage chambers (12), (13), (14) and (15) composed of fire resistant balls with diameters of 40mm to 80mm, downwards flow, exchange heat, pass through a spherical cap-shaped furnace grill (15) and an air current uniform distributing device (16), enter a smoke outlet (21), are converged into a main flue (6) and discharge used residual heat. Cold air A enters a cold air inlet 21 through a tee. After the cold air A and the ball bed are processed by counter current heat exchange, the temperature of hot air H is adjusted and controlled to 1200 to 1250 DEG C and the hot air H is transferred into the high furnace.
Description
One, technical field
The present invention relates to a kind ofly obtain the method for high wind-warm syndrome with pure blast furnace gas combustion, in other words, this high wind-warm syndrome is to adopt the lower heat of combustion blast furnace gas to obtain in the pebble stove of flooring furnace binding, belongs to technical field of blast furnace ironmaking.
Two, background technology
Along with the blast furnace technology development of (containing the coal powder injection technology), ironmaking requires hot blast temperature more and more higher.High wind-warm syndrome can improve combustion intensity, the reduction ratio of putting coke into furnace of blast furnace, and ton iron energy consumption is reduced, and can also improve pig iron output.So high wind-warm syndrome technology is one of national ironmaking technology of encouraging and giving priority to.
At present, various measures have been taked for improving wind-warm syndrome both at home and abroad, increase considerably the pebble stove of hotblast stove heating surface as employing, utilize the waste gas of hot-blast stove flue waste heat, with raw gas preheating purified gas, take the hotblast stove self-preheating, mix the high heating value coke-oven gas that burns significant proportion, these processing methodes have obtained certain achievement to some extent.But concerning the overwhelming majority's Steel Plant, coke-oven gas is all most valuable, mixes to burn producer gas method and unrealistic; Self-preheating process pipeline, valve are many, and it is very big that old factory is transformed difficulty, new factory construction investment height, and complicated operation; It is many 50～60 ℃ of scopes only to utilize the stack gases waste heat to improve wind-warm syndrome, very limited, far can not satisfy the requirement of the high wind-warm syndrome of ironmaking.The CN2273311Y of Chinese patent bulletin is entitled as " 250m
3Above blast furnace pebble stove ", it discloses following technology: pile up the pebble stove that the balling-up bed replaces the checker brick regenerator naturally by magnalium and high alumina matter refractory ball, heating-surface area is generally 2～4 times of Cowper stove checker brick, its heat transfer coefficient is generally about 10 times of checker brick, and the hot-blast outlet temperature under identical dome temperature is than Cowper stove height.But according to operation practice and test shows for many years, the not enough problem that this technological invention exists has: the ball bed hop count that (1) ball bed regenerator refractory ball material, unlike material are formed is unreasonable, and the clear ball cycle is short, the working cost height.Two-section type ball bed regenerator, the long-term high-temperature flue gas that produces with combustion processes of epimere magnalium ball ball bed contacts, and owing in the flue gas moisture content is arranged, MgO at high temperature with water vapor H
2The O reaction generates Mg (OH)
2, and produce volumetric expansion, and porous has appearred in the pebble bed surface that contacts with flue gas, cracking is damaged, and condemnation factor is up to 78%, and the heat-carrying of ball bed, heat storage function wreck; The epimere ball bed of siliceous ball because density is little, generally has only 1.9t/m
3So thermal capacity is little, cause the wind-warm syndrome instability, and siliceous ball heat impact strength is poor.The high aluminium ball ball bed that middle hypomere contacts with the magnalium ball is because high aluminium ball contains Fe
2O
3Higher, issue biochemical reaction in hot conditions, easily generate low melting point, high temperature bond and caking phenomenon have then appearred in the ball bed, serious barrier gas passage, on air drag losses is up to 20kPa, and the ball bed that has just was forced to deashing in 1～2 year and unloads ball, reload new ball and could realize normal heat exchange law, cause the production run expense to increase.(2) disorder of thermal technology's phenomenon, thermo-efficiency are not high.Pebble stove adopts the overhead system furnace binding, the bottom body of heater of reverse frustoconic, the exhanst gas outlet section is contraction-like, flue gas moves ahead for quickening, add top combustion insufficient space, particularly cage type fire grate gas flow area is obviously less than normal, cause combustion processes flow of flue gas resistance big, air-supply initial stage wind-warm syndrome goes up not down, and burning initial stage dome temperature does not rise counter falling, and spent air temperture rises slowly, the burning phase reached more than 3.5 hours, the disorderly phenomenon of tangible thermal technology occurred, this and the short-period duty utmost point of pebble stove do not match, and the thermo-efficiency of system only is 72%.(3) do not consider the fume afterheat utilization.The general spent air temperture of pebble stove directly enters atmosphere by chimney about 250～300 ℃, residual heat resources fail to utilize.(4) the wind-warm syndrome level is not high.The wind-warm syndrome of Shi Yonging is about 1050 ℃ for many years, and the short period of time reached 1100 ℃, and the high wind-warm syndrome of distance more than 1200 ℃ still has 100～150 ℃ gap.
Three, summary of the invention
The objective of the invention is provides a kind of method that obtains high wind-warm syndrome with pure blast furnace gas combustion at the deficiencies in the prior art, be characterized in adopting the pebble stove of flooring furnace binding, multi-stage type ball bed, the refractory ball material that the adaptive temperature field changes, the precell system makes full use of the blast-furnace hot-air kiln gas combustion air, coal gas is carried out preheating, improve dome temperature, guarantee under the condition of whole pure blast furnace gas of lower heat of combustion, to obtain high wind-warm syndrome.
Purpose of the present invention is realized by following technical measures:
Obtain the method for high wind-warm syndrome with pure blast furnace gas combustion:
Adopt the pebble stove of flooring furnace binding.Utilize the flue gas of 250～300 ℃ in most of hotblast stove in the main flue to mix afterwards the hotblast stove combustion air with 300～320 ℃ of flue gases after turbolator or the heat exchange of insert high-temperature heat-exchanging, coal gas carries out being preheating to the first time 200 ℃, flue-gas temperature drops to 150～180 ℃, through smoke exhaust fan by smoke stack emission, the precell burning is through the part low-heat value gas of the preheating first time, produce temperature and reach 900～1000 ℃ high-temperature flue gas, mix with the flue gas of 250～300 ℃ in small portion hotblast stove in the main flue, only combustion air is carried out the preheating second time through turbolator or insert high-temperature heat-exchanging.Combustion air is preheating to 350～400 ℃, the combustion chambers burn that the burner port of delivering to pebble stove and most of purified gas of preheating for the first time mix laggard goal formula hotblast stove, produce 1300～1350 ℃ high-temperature flue gas, the multi-stage type ball bed regenerator that flue gas is formed by φ 40～80mm refractory ball, with heat transferred refractory ball bed, the ball bed tempertaure rises, continue to flow downward after flue gas is cooled to 250～300 ℃, pass through spherical fire grate, airflow uniform distribution device, enter flow inlet and outlet, import main flue.Freezing air enters air-flow by threeway and imports and exports, and with ball bed counterflow heat exchange, blast furnace ℃ is sent in regulation and control hot blast temperature to 1200～1250.
The epimere of the pebble stove of flooring furnace binding is that vault combustion chamber, both sides are provided with burner port and hot-air mouth, multi-stage type ball bed is adopted in the stage casing, the regenerator that the refractory ball of installing φ 40～80mm is formed on the ball bed, the ball bed with crutched spherical fire grate supporting, refractory ball is by manhole or dress ball hole and unload the loading and unloading of ball hole, hypomere is established the gentle outflow inlet of airflow uniform distribution device.
The present invention compared with prior art has following advantage:
1, adopt the pebble stove of flooring furnace binding, multi-stage type ball bed regenerator adapts to the variation of ball bed tempertaure field preferably, and the ball bed life-span is long, and deashing unloads the ball cycle and can reach 6～8 years, reduces the production run expense at double.
2, spherical fire grate and lower stream of airflow even distribution device greatly improve the heat exchange condition of ball bed, and air resistance reduces, and ball bed heat exchange area utilization ratio improves, and guarantees that thermo-efficiency is more than 80%.
3, the fume afterheat utilization of resources of precell system is abundant, and the flue-gas temperature that finally enters chimney is 150～180 ℃.
4, all use lower heating value less than 3000kJ/m
3The pure blast furnace gas combustion of n reaches more than 1200 ℃ the wind pushing temperature of pebble stove.
Four, description of drawings
Fig. 1 is for obtaining the process flow sheet of high wind-warm syndrome with pure blast furnace gas combustion.
Hot blast more than 1 1200 ℃, 2 precells, 3 turbolators or insert high-temperature heat-exchanging, 4 air heat exchangers, 5 gas change heaters, 6 main flues, 7 blast furnace purified gas, 8 combustion airs, 9 smoke exhaust fans, 10 chimneys, 11 hotblast stoves.
Fig. 2 is the hot furnace structure synoptic diagram of the ball formula of flooring furnace binding.
12～15 is refractory ball ball bed, 16 spherical fire grates, and 17 airflow uniform distribution devices, 18 combustion chambers, 19 burner ports, 20 hot-blast outlets, 21 air-flows are imported and exported, and 22 unload the ball hole, 23 manholes or dress ball hole, 24 fire grate pillars, 25 ash removing openings, 26 freezing airs.
Five, embodiment
Below by embodiment the present invention is carried out concrete description; be necessary to be pointed out that at this present embodiment only is used for the present invention is further specified; can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field can make some nonessential improvement and adjustment according to oral account content of the present invention.
Embodiment
The method that obtains high wind-warm syndrome with pure blast furnace gas combustion as shown in Figure 1.After 20～25 ℃ of air that bloated by burner blower 8 are preheating to 180～200 ℃ for the first time by hot tube heat exchanger 4, small part is done outside the combustion air by precell 2, major part is undertaken being preheating to 380～400 ℃ the second time by turbolator interchanger or insert interchanger 3, delivers to pebble stove burner port 19.Simultaneous temperature reaches 150～170 ℃, dustiness less than 10mg/m
3After the purified gas 7 of n, dry method dust is preheating to 200 ℃ for the first time through hot tube heat exchanger 5, small part is done outside the combustion heat source by precell 2, major part is delivered to burner port 19, with combustion air after burner port 19 mixes, enter 18 burnings of vault combustion chamber, produce 1300～1350 ℃ high-temperature flue gas, the 4 segmentation ball bed regenerator of forming by φ 40～φ 80mm refractory ball 12～15 flow downward, carry out heat exchange, with heat transferred refractory ball bed, flue gas is cooled, and temperature reduces gradually, and ball bed 12～15 is heated intensification, stores a large amount of heats.Temperature drops to 250～300 ℃ flue gas and continues to flow downward, by spherical fire grate 16 and lower stream of airflow even distribution device 17, enter air-flow and import and export the 21 final main flues 6 that import, small part is introduced into the outlet of precell 2, after 900～1000 ℃ high-temperature flue gas of precell 2 generations mixes, enter turbolator interchanger or insert high-temperature heat-exchanging 3, with the heat transferred combustion air.300～320 ℃ of low-temperature flue gas of high-temperature heat-exchanging 3 outlet converge with most of flue gas of flue 6 and enter hot tube heat exchanger 4,5, carry out heat exchange, flue-gas temperature reduce to 150～180 ℃ after smoke exhaust fan 9 discharge by chimney 10.
80～100 ℃ of freezing airs that blast furnace blowing engine bloats are sent into air-flow by threeway and are imported and exported 21, through lower stream of airflow even distribution device 17, after entering the uniform chamber of cold wind, upwards flow by spherical fire grate Final 16 system, carry out counterflow heat exchange with ball bed regenerator 15～12, ball bed refractory ball is cooled, freezing air is heated to form hot blast, be blended into portion temperature as required in right amount and be 80～100 ℃ freezing air, guarantee that convergeing to the hot blast temperature that the hot-blast main is sent to blast furnace by hot-blast outlet 20 reaches 1200～1250 ℃.In order to guarantee carrying out uninterruptedly of whole air-supply process, No1～4 hotblast stoves 11 are carried out 2 burnings, the operating duty of 2 air-supplies, or the operating duty of staggered parallel blowing.Air-supply and cycle combustion time were respectively about 1 hour, specifically cycle length factually the wind-warm syndrome of border wind pushing temperature or blast furnace demand adjust.
As shown in Figure 2, the epimere of the pebble stove of flooring furnace binding is vault combustion chamber 18, both sides are provided with burner port 19 and hot-blast outlet 20, the stage casing is a multi-stage type ball bed 12～15, the regenerator that installing φ 40～80mm refractory ball is formed on the ball bed, the ball bed with spherical fire grate 16 supporting of fire grate pillar 24, refractory ball is by manhole or dress ball hole 23 and unload 22 loading and unloading of ball hole, hypomere is established airflow uniform distribution device 17 gentle flow inlet and outlets 21.
In the pebble stove refractory materials of flooring furnace binding, the material of refractory ball should be complementary with refractory materials with hotblast stove.
The present invention is achieved in that can reach 6～8 years general duration of service.The operation of when the drag losses of ball bed 12～15 reaches 15～20kPa, can changing the shuttle.4 pebble stoves carry out respectively successively, only change 1 at every turn, and 3 work in addition guarantee normally carrying out of production.When changing the shuttle, the ash removing opening 25 of opening vault combustion chamber 18 and 17 settings of lower stream of airflow even distribution device earlier carries out natural ventilation with dress ball hole 23 and cools, when dome temperature drops to 600～700 ℃, then can open and unload ball hole 22, refractory ball rolls naturally by action of gravity from spherical fire grate 16 and discharges out of the furnace.The caking refractory ball that small portion is difficult for rolling out after the human-generated explosives, carries out deashing and handles and sorting, and unbroken refractory ball can reload in the stove and reuse, and insufficient section need replenish new ball.After having adorned ball, closeall hole, valve carry out baker, trouble-free burning, pushing wind manipulation.Prepare the loading and unloading ball operation of next pebble stove successively.The loading and unloading ball operation required time of a pebble stove is can finish in 10～12 days.
Claims (2)
1, obtains the method for high wind-warm syndrome with pure blast furnace gas combustion, it is characterized in that adopting the pebble stove (11) of flooring furnace binding, the flue gas that utilizes 250～300 ℃ in most of hotblast stove in the main flue (6) with mix through 300～320 ℃ of flue gases after turbolator or insert elevated temperature heat parallel operation (3) heat exchange after enter hot tube heat exchanger (4) (5), combustion air (8), coal gas (7) are carried out being preheating to the first time 200 ℃, flue-gas temperature is fallen 150～180 ℃, is discharged by chimney (10) through smoke exhaust fan (9); Precell (2) the burning small portion low-heat value gas and the combustion air of preheating for the first time, produce temperature and reach 900～1000 ℃ high-temperature flue gas, mix through turbolator or insert high temperature parallel operation (3) with 250～300 ℃ of flue gases of small portion hotblast stove of main flue (6), only combustion air (8) is carried out the preheating second time, combustion air temperature is preheating to 350～400 ℃, the burner port (19) of delivering to pebble stove (11) mixes combustion chamber (18) burning of laggard goal formula hotblast stove with most of purified gas (7) of preheating for the first time, produce 1300～1350 ℃ high-temperature flue gas, multi-stage type ball bed regenerator (12)～(15) that flue gas is formed by φ 40～80mm refractory ball flow downward, through spherical fire grate (16), airflow uniform distribution device (17), enter air-flow and import and export (21), import main flue (6); Freezing air (26) enters air-flow by threeway and imports and exports (21), and after ball bed (15)～(12) counterflow heat exchange, regulation and control hot blast (1) temperature to 1200～1250 ℃ is sent into blast furnace.
2, obtain the method for high wind-warm syndrome according to claim 1 with pure blast furnace gas combustion, the epimere that it is characterized in that the pebble stove (11) of flooring furnace binding is vault combustion chamber (18), both sides are provided with burner port (19) and hot-air mouth (20), the stage casing is multistage ball bed (12)～(15), the regenerator that installing φ 40～80mm refractory ball is formed on the ball bed, the ball bed supports with the spherical fire grate (16) that pillar (24) is arranged, refractory ball is by manhole (23) and unload ball hole (22) loading and unloading, hypomere is established airflow uniform distribution device (17), and air-flow is imported and exported (21) and ash removing opening (25).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100224738A CN1296495C (en) | 2004-05-10 | 2004-05-10 | High wind temperature obtaining method using pure blast furnace gas combustion |
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| CNB2004100224738A CN1296495C (en) | 2004-05-10 | 2004-05-10 | High wind temperature obtaining method using pure blast furnace gas combustion |
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| CN1296495C true CN1296495C (en) | 2007-01-24 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100398668C (en) * | 2005-06-30 | 2008-07-02 | 宝山钢铁股份有限公司 | Technological process and apparatus for heating high concentration CO and other reducing gas |
| CN101566389A (en) * | 2008-04-24 | 2009-10-28 | 沈阳东方钢铁有限公司 | Horizontal-type high temperature hot-blast furnace |
| CN108344287B (en) * | 2018-02-13 | 2023-11-10 | 国家粮食局科学研究院 | Energy-saving and environment-friendly large-scale grain drying complete device and drying method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053701C (en) * | 1997-01-24 | 2000-06-21 | 冶金工业部鞍山热能研究院 | Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air |
| CN1084792C (en) * | 1999-05-31 | 2002-05-15 | 宝山钢铁股份有限公司 | High air-temperature high furnace space gas preheating method |
| CN1355323A (en) * | 2001-11-30 | 2002-06-26 | 承德市鸿博科贸有限公司 | Equipment and method for preheating gas and combustion-promoting air of blast furnace |
| JP2002266012A (en) * | 2001-03-08 | 2002-09-18 | Nippon Steel Corp | Waste heat recovering equipment for hot air stove for blast furnace |
-
2004
- 2004-05-10 CN CNB2004100224738A patent/CN1296495C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053701C (en) * | 1997-01-24 | 2000-06-21 | 冶金工业部鞍山热能研究院 | Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air |
| CN1084792C (en) * | 1999-05-31 | 2002-05-15 | 宝山钢铁股份有限公司 | High air-temperature high furnace space gas preheating method |
| JP2002266012A (en) * | 2001-03-08 | 2002-09-18 | Nippon Steel Corp | Waste heat recovering equipment for hot air stove for blast furnace |
| CN1355323A (en) * | 2001-11-30 | 2002-06-26 | 承德市鸿博科贸有限公司 | Equipment and method for preheating gas and combustion-promoting air of blast furnace |
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