CN104109753A - Single air regenerative burner for roller hearth furnace - Google Patents
Single air regenerative burner for roller hearth furnace Download PDFInfo
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- CN104109753A CN104109753A CN201410335451.0A CN201410335451A CN104109753A CN 104109753 A CN104109753 A CN 104109753A CN 201410335451 A CN201410335451 A CN 201410335451A CN 104109753 A CN104109753 A CN 104109753A
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Abstract
The invention discloses a single air regenerative burner for a roller hearth furnace, which belongs to the technical field of regenerative heating furnace equipment and is used for heating plate blanks. According to the technical scheme, air and smoke are subjected to heat storage and heat discharge in an upper box body, a coal gas spray gun is mounted in a lower box body, the central line of the coal gas spray gun coincides with that of a burner brick, and an air spraying hole and a coal gas spraying hole are formed in the burner brick. When the single air regenerative burner is used, coal gas and the air are sprayed out to form a concentric jet-flow state and are premixed and burnt in the burner brick. The best combustion effect of the regenerative burner can be ensured, the purpose of quickly heating steel billets can be achieved, the requirements for the tapping temperature and temperature difference of the plate blanks in a steel rolling process can be met, and the characteristics of high efficiency and energy conservation of a regenerative combustion technology are fully reflected. Meanwhile, the combustion temperature of the coal gas can be effectively reduced, and the highest combustion temperature of a hearth can be controlled to be less than 1280 DEG C, so that the generation of NOx can be effectively reduced; the environment cannot be polluted; the regenerative burner has remarkable social benefits.
Description
Technical field
The present invention relates to the air single regenerative burner that on a kind of sheet billet continuous casting and rolling production line, heat accumulating type roller bottom heating furnace uses, belong to recuperative heater equipment technical field.
Background technology
Sheet billet continuous casting and rolling production line is compact broad hot strip production line, slab is after continuous casting completes, directly enter stove at the bottom of roller, the charging temperature of slab is up to more than 850 DEG C, generally can reach 920 DEG C even higher, continuously cast bloom mainly carries out concurrent heating and samming process in stove at the bottom of roller, reach 1150 DEG C at board briquette, behind the temperature difference≤10 DEG C, can meet the processing requirement of steel rolling, simultaneously at the bottom of roller stove also for continuous casting and two kinds of different production technique of milling train provide surge time, be that milling train is in roll change or while there is accident, continuous casting is unaffected, the slab of producing enters in process furnace and stores, and guarantee continuous caster can be produced continually and steadily.
Distinguish to some extent with conventional heater for rolling steel function, roller hearth type heating furnace generally adopts type of heating, and burner is arranged in the top of furnace roller, and the layout of burner and associated conduit can not affect the replacing of furnace roller.Roller hearth type heating furnace is to be mainly steel billet concurrent heating simultaneously, and steel billet is warming up to rapidly 1150 DEG C at the bottom of entering roller after stove, utilizes subsequently the process moving ahead in stove at the bottom of slab roller, carries out the soaking of slab, and the temperature difference of the slab of finally coming out of the stove is controlled within 10 DEG C.So the heat capacity of stove burner is very little at the bottom of roller, the first heating zone of stove heating efficiency maximum at the bottom of roller, the heat capacity of its burner is 0.39GJ/h, and the heat capacity of soaking zone burner is only 0.13GJ/h, is below 1/2 or 1/6 of conventional heat-accumulating burner heat capacity.For heat-accumulating burner, too high heating demand can increase the length of burner flame, and the surface of damage slab, causes quality accident.Too low heating demand means that to participate in flue gas or the air flow quantity of heat-accumulating burner little, thereby make can not fully carry out heat exchange between the heat storage of heat-accumulating burner inside and flue gas and heat storage and air, the heat exchange efficiency that reduces heat-accumulating burner, finally affects the realization of heat storage type combustion energy-saving effect.
The heat-accumulating burner using on existing heater for rolling steel is free gas double accumulation of heat and two kinds of forms of air single regenerative burner.Because stove at the bottom of sheet billet continuous casting and rolling production line top roll belongs to concurrent heating type process furnace, only be provided with heating burner, rely on high-temperature flue gas in the time flowing to underflue, realize the heating to slab lower surface, and the two heat-accumulating burners of space gas are by air required burning, coal gas is accumulation of heat in heat storage tank separately respectively, rely on the T-valve of air and coal gas to realize accumulation of heat and the combustion processes of air and coal gas, the flue gas producing after burning only carries out between the burner of commutation mutually, the in the situation that of heating under not, easily cause the upper and lower temperature difference of slab, while is because two heat-accumulating burners is bulky, also can affect the production operation of stove at the bottom of roller, therefore two heat-accumulating burners cannot use on stove at the bottom of roller.Air single heat accumulating type nozzle is only by air accumulation of heat, not accumulation of heat of coal gas, and therefore the structure of its structure and conventional heat-accumulating burner is basic identical, also comprises that burner block, heat-accumulating burner casing, gas port, air T-valve, coal gas cuts the members such as valve soon.But the coal gas of this air single regenerative burner and air adopt outer mixed combustion system, be that coal gas and air are from spout ejection separately, burn on burner hearth inner edge mixing limit, the flame of burner is longer, unburnt coal gas is easily taken away by the burner on opposite, in the burner of smoke evacuation, there is secondary combustion, cause the efficiency of combustion of heat-accumulating burner low, combustion efficacy is poor, this air single regenerative burner is under underload, the regenerator temperature of air is on the low side, also can reduce the efficiency of combustion of process furnace, while is due to the existence of secondary combustion phenomenon, make the honeycomb life-span in heat-accumulating burner short, running cost is high.
Summary of the invention
Technical problem to be solved by this invention is to provide stove air single heat accumulating type nozzle at the bottom of a kind of roller, this single heat storage type burner can be applied on heat accumulating type roller bottom heating furnace, steady running under low heating demand state, meet the special heating process requirement of stove at the bottom of heat accumulating type roller, realize the heating quality of steel rolling process to slab and the requirement of heating of plate blank speed, the limit that simultaneously can also realize the fume afterheat that stove produces at the bottom of roller reclaims, the energy-saving effect of stove at the bottom of raising heat accumulating type roller, and reduce the NO in combustion processes
xgeneration.
The technical scheme solving the problems of the technologies described above is:
Stove air single heat accumulating type nozzle at the bottom of a kind of roller, it comprises upper box, lower box, burner block, gas spray gun, air T-valve, coal gas is cut valve soon, air T-valve is arranged on the upper end of upper box, upper box inside is provided with floater guide block and heat storage, in lower box, it is the long chamber of level, the lower end of upper box is connected with the chamber rear end of lower box, on the chamber central axis of lower box, gas spray gun is installed, gas spray gun is wrapped up by refractory materials, the rear end of gas spray gun is cut soon valve with coal gas and is connected, front end at lower box is installed burner block, there is gas port at burner block center, gas port is around around air jet, gas port is connected with the spout of gas spray gun, the rear end of air jet is connected with the chamber of lower box, before burner block, there is the circular burning groove caving inward, the opening of gas port and air jet lays respectively on the center and circumference of burning groove.
Stove air single heat accumulating type nozzle at the bottom of above-mentioned roller, one end of described air T-valve is connected with air line, and the other end is connected with flue, and lower end is connected with upper box.
Stove air single heat accumulating type nozzle at the bottom of above-mentioned roller, described upper box is above lower box, and upper box is vertical with lower box to be placed, and upper box and lower box are all provided with thermal insulation layer.
Stove air single heat accumulating type nozzle at the bottom of above-mentioned roller, described lower box, together with burner block, is bolted on the top side wall of stove at the bottom of roller.
Stove air single heat accumulating type nozzle at the bottom of above-mentioned roller, the air jet of described burner block is around gas port circumference uniform distribution, and the axis of air jet and the axis of gas port have angle, and angle is 5-30 degree.
Beneficial effect of the present invention is:
The invention provides a kind of air single heat accumulating type nozzle, in the time that burner carries out heat storage operation, can be by the temperature producing in stove combustion processes at the bottom of roller the high-temperature flue gas up to 1200 DEG C, introduce in heat accumulating type casing, carry out heat exchange with heat storage, spent air temperture after heat exchange is at 120 ~ 150 DEG C, and discharges out of the furnace.In the time that heat-accumulating burner burns, freezing air enters in accumulation of heat casing, after heat storage heat exchange, becoming high temperature air starts in burner block with coal gas to mix, and enter burning in stove, because the air themperature after accumulation of heat is up to 1000 DEG C, therefore, at the bottom of roller, the fire box temperature of stove can reach 1200 ~ 1250 DEG C, meets the heating process requirement of stove at the bottom of roller.
Heat-accumulating burner of the present invention adopts concentric mode of jet, it is the center that coal gas is placed in burner, air ring is around coal gas, air and coal gas have mixed in burner block, and take fire rapidly, when spray combustion, air and coal gas shape have a certain degree, the length of flame while effectively shortening burning, accelerate flame mechanism, ensured burner stably accumulation of heat and burning under low heating demand, the particularly important is, while ensureing burning, flame can not touch the surface of slab, has guaranteed the surface quality of the roll coil of strip.
What the present invention adopted is air single regenerative mode, can effectively reduce NO
xdeng the generation of pollutent.In combustion processes, at the bottom of roller, the fire box temperature of stove can be controlled at below 1280 DEG C, therefore, and the NO in products of combustion
xbe no more than 150mg/Nm
3, far below national standard, reduced NO
xto the pollution of environment, there is great social benefit.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the left view of Fig. 1;
Fig. 3 is the application schematic diagram of the present invention on roller hearth furnace.
Being labeled as in figure: at the bottom of roller, stove 1, furnace roller 2, slab 3, heat-accumulating burner 4, air T-valve 5, upper box 6, gas spray gun 7, lower box 8, coal gas are cut valve 9, thermal insulation layer 10, heat storage 11, floater guide block 12, burner block 13, air jet 14, gas port 15, burning groove 16 soon.
Embodiment
Heat-accumulating burner 4 of the present invention is arranged on the top of stove 1 at the bottom of roller, and furnace roller 2 is arranged on the mid-way of roller furnace 1, and the mounting means of heat-accumulating burner 4 can not have influence on the replacing of furnace roller 2.The slab 3 of coming from continuous casting is in furnace roller 2 operations, slab 3 is in operational process simultaneously, temperature can be when entering stove 900 DEG C rises to 1150 DEG C, the temperature difference≤10 DEG C, meet the requirement of steel rolling process, in order to prevent in combustion processes, the flame of heat-accumulating burner 4 directly contacts the surface of slab 3, make it to produce the problems such as overheated or burning, in one embodiment of the invention, the gas port 15 of heat-accumulating burner 4 is 380 ~ 420mm apart from the height of slab 3 upper surfaces, this type of heating is typically to go up type of heating, the heat producing in combustion processes by radiation delivery to slab 3.
The present invention includes upper box 6, lower box 8, burner block 13, gas spray gun 7, air T-valve 5, coal gas and cut soon valve 9.
In figure, show, two kinds of heat exchanging process in heat storage type combustion process, be between high-temperature flue gas and Low Temperature Storage hot body, between high-temperature thermal storage body and freezing air, all in upper box 6, complete, upper box 6 inside are provided with floater guide block 12 and heat storage 11, the mounting height of heat storage 11 is 6 layers, ensures the heat storage capacity of burner.
In figure, show, air T-valve 5 is arranged on the upper end of upper box 6, and one end of air T-valve 5 is connected with air line, and the other end is connected with flue, and for entering the flue gas of freezing air and discharge low temperature, lower end is connected with upper box 6.
In figure, show, upper box 6 is above lower box 8, upper box 6 placement vertical with lower box 8, in lower box 8, it is the long chamber of level, the lower end of upper box 6 is connected with the chamber rear end of lower box 8, and upper box 6 and lower box 8 are all provided with thermal insulation layer 10, and thermal insulation layer 10 adopts complex heat-preservation, the thickness of thermal insulation layer 10 exceedes 100mm, can reduce like this housing heat lost by radiation of heat-accumulating burner 4.
In figure, show, high temperature air enters lower box 8 from upper box 6, at the interior balancing procedure that completes high temperature air temperature and flow velocity of lower box 8.Than the heat-accumulating burner of conventional heater for rolling steel, at the bottom of roller, the heating demand of stove heat-accumulating burner is less, only has below 1/2 or even 1/6 of conventional heat-accumulating burner, under low heating demand, flow and the flow velocity of air and coal gas there will be unsure state, be difficult to ensure the length of flame, and then affect the stability of fire box temperature, and the heat exchange function of heat-accumulating burner 4 is arranged in upper box 6, in lower box 8, complete the even process of high temperature air, this is very useful for balanced air velocity.
In figure, show, on the chamber central axis of lower box 8, gas spray gun 7 is installed, gas spray gun 7 is wrapped up by refractory materials, and the rear end of gas spray gun 7 is cut soon valve 9 with coal gas and is connected, and realizes the jet action in combustion processes.
In figure, show, front end at lower box 8 is installed burner block 13, and there is gas port 15 at burner block 13 centers, and gas port 15 is around around air jet 14, gas port 15 is connected with the spout of gas spray gun 7, and the rear end of air jet 14 is connected with the chamber of lower box 8.
In figure, show, the air jet 14 of burner block 13 around gas port 15 at circumference uniform distribution, form concentric jet state, air jet 14 is relevant with the heating demand of burner with the angle of gas port 15, heating demand is larger, and angle of cut α is just larger, its objective is in the time that space gas fully mixes, can control the length of flame in the scope of setting, the angle of the axis of the axis of air jet 14 and gas port 15 is 5-30 degree.
In figure, show, before burner block 13, there is the circular burning groove 16 caving inward, the opening of gas port 15 and air jet 14 is positioned on burning groove 16 center and circumference, and burning groove 16 plays the effect of mixing air and coal gas, makes air and coal gas in burner block 13, just can realize burning.The air-flow of high temperature air is from the interior ejection of burner block 13, with the cross-shaped state of air-flow of coal gas, air and coal gas complete in the interior mixing of burning groove 16 of burner block 13, and take fire rapidly, this combustion system, the short flamed length that can contract also ensures that coal gas can perfect combustion.
In figure, show, lower box 8, together with burner block 13, is bolted on the top side wall of stove at the bottom of roller, on stove at the bottom of heat accumulating type roller, is furnished with multiple same heat-accumulating burners 4 along stove both sides.
Working process of the present invention is as follows:
In the time that heat-accumulating burner 4 burns, air side valve plate in air T-valve 5 is opened, fume side valve plate is closed, air in air line can enter upper box 6 by air T-valve like this, carry out heat exchange with the heat storage 11 in upper box 6, final air themperature reaches 1000 DEG C, enters burner block 13 by lower box 8, sprays from air jet 14.Meanwhile, the coal gas on gas spray gun 7 is cut soon valve 9 and is synchronizeed and open with air T-valve 5, and coal gas is through gas spray gun 7, spray from gas port 15, air and coal gas mix with angle [alpha] in burner block 13, and burning rapidly, in one embodiment of the invention, α is 9 ° ~ 12 °.
Air and coal gas spouting velocity are set in 6 ~ 8 meter per seconds, and flue gas and the air flow velocity in heat storage tank maintains 2 ~ 3 meter per seconds, after air and coal gas ejection, in the interior beginning mixed firing of burner block 13, ensure accumulation of heat and final combustion efficacy.
In the time that heat-accumulating burner 4 carries out accumulation of heat, coal gas is cut soon valve 9 and is closed, gas spray gun 7 is in closing condition, air side valve plate in air T-valve 5 is closed, the valve plate of fume side is opened, from the temperature of the flue gas of stove 1 interior generation at the bottom of roller up to 1150 ~ 1200 DEG C, enter lower box 8 by the air jet 14 on burner block 13, finally enter upper box 6, carry out heat exchange with the floater guide block 12 and the heat storage 11 that are arranged on upper box 6 inside, and the temperature of heat storage 11 and floater guide block 12 is heated to more than 1000 DEG C, and the flue-gas temperature of discharging from heat storage 11 ends is 120 ~ 150 DEG C, be discharged to flue by air T-valve 5, finally be discharged in atmosphere.
The present invention is the commutation cycle of adjusting accumulation of heat and the burning of burner according to funnel temperature, and in the combustion processes of stove at the bottom of roller 1, the commutation cycle of heat-accumulating burner 4 is 45 ~ 60 seconds.
What adopt due to heat-accumulating burner 4 is air accumulation of heat, and the mode of not preheating of coal gas can effectively reduce the temperature of combustion of coal gas, the maximum combustion temperature of burner hearth can be controlled at below 1280 DEG C, thereby can effectively reduce the generation of NOx, environment is not polluted, there is significant social benefit.
Claims (5)
1. stove air single heat accumulating type nozzle at the bottom of a roller, it is characterized in that: it comprises upper box (6), lower box (8), burner block (13), gas spray gun (7), air T-valve (5), coal gas is cut valve (9) soon, air T-valve (5) is arranged on the upper end of upper box (6), upper box (6) inside is provided with floater guide block (12) and heat storage (11), in lower box (8), it is the long chamber of level, the lower end of upper box (6) is connected with the chamber rear end of lower box (8), gas spray gun (7) is installed on the chamber central axis of lower box (8), gas spray gun (7) is wrapped up by refractory materials, the rear end of gas spray gun (7) is cut soon valve (9) with coal gas and is connected, front end at lower box (8) is installed burner block (13), there is gas port (15) at burner block (13) center, gas port (15) is around around air jet (14), gas port (15) is connected with the spout of gas spray gun (7), the rear end of air jet (14) is connected with the chamber of lower box (8), before burner block (13), there is the circular burning groove (16) caving inward, the opening of gas port (15) and air jet (14) lays respectively on the center and circumference of burning groove (16).
2. stove air single heat accumulating type nozzle at the bottom of roller according to claim 1, is characterized in that: one end of described air T-valve (5) is connected with air line, and the other end is connected with flue, and lower end is connected with upper box (6).
3. stove air single heat accumulating type nozzle at the bottom of roller according to claim 1 and 2, it is characterized in that: described upper box (6) (8) above lower box, upper box (6) placement vertical with lower box (8), upper box (6) and lower box (8) are all provided with thermal insulation layer (10).
4. stove air single heat accumulating type nozzle at the bottom of roller according to claim 3, is characterized in that: described lower box (8), together with burner block (13), is bolted on the top side wall of stove (1) at the bottom of roller.
5. stove air single heat accumulating type nozzle at the bottom of roller according to claim 4, it is characterized in that: the air jet (14) of described burner block (13) is around gas port (15) circumference uniform distribution, the axis of the axis of air jet (14) and gas port (15) has angle, and angle is 5-30 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410335451.0A CN104109753A (en) | 2014-07-15 | 2014-07-15 | Single air regenerative burner for roller hearth furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410335451.0A CN104109753A (en) | 2014-07-15 | 2014-07-15 | Single air regenerative burner for roller hearth furnace |
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| CN104109753A true CN104109753A (en) | 2014-10-22 |
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ID=51706739
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410335451.0A Pending CN104109753A (en) | 2014-07-15 | 2014-07-15 | Single air regenerative burner for roller hearth furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631574A (en) * | 2018-12-20 | 2019-04-16 | 唐山钢铁集团有限责任公司 | A kind of Two-cuff Technique roller hearth type heating furnace |
| CN111520719A (en) * | 2020-05-11 | 2020-08-11 | 北京君合悦科技发展有限公司 | Natural gas single heat storage burner |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11148605A (en) * | 1997-09-17 | 1999-06-02 | Joachim Wunning | Regenerative burner |
| KR100649323B1 (en) * | 2005-11-01 | 2006-11-24 | 재단법인 포항산업과학연구원 | A method and an apparatus for preventing damage of fuel nozzle in a regenerative burner |
| CN201225620Y (en) * | 2008-06-16 | 2009-04-22 | 武汉科虹工业炉有限公司 | Air single thermal storage combustor |
| CN101799158A (en) * | 2010-02-24 | 2010-08-11 | 中冶华天工程技术有限公司 | Air single regenerative burner |
| CN201935190U (en) * | 2010-12-23 | 2011-08-17 | 上海嘉德环境能源科技有限公司 | External single heat-accumulation burner |
| CN203976884U (en) * | 2014-07-15 | 2014-12-03 | 河北钢铁股份有限公司唐山分公司 | Stove air single heat accumulating type nozzle at the bottom of a kind of roller |
-
2014
- 2014-07-15 CN CN201410335451.0A patent/CN104109753A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11148605A (en) * | 1997-09-17 | 1999-06-02 | Joachim Wunning | Regenerative burner |
| KR100649323B1 (en) * | 2005-11-01 | 2006-11-24 | 재단법인 포항산업과학연구원 | A method and an apparatus for preventing damage of fuel nozzle in a regenerative burner |
| CN201225620Y (en) * | 2008-06-16 | 2009-04-22 | 武汉科虹工业炉有限公司 | Air single thermal storage combustor |
| CN101799158A (en) * | 2010-02-24 | 2010-08-11 | 中冶华天工程技术有限公司 | Air single regenerative burner |
| CN201935190U (en) * | 2010-12-23 | 2011-08-17 | 上海嘉德环境能源科技有限公司 | External single heat-accumulation burner |
| CN203976884U (en) * | 2014-07-15 | 2014-12-03 | 河北钢铁股份有限公司唐山分公司 | Stove air single heat accumulating type nozzle at the bottom of a kind of roller |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631574A (en) * | 2018-12-20 | 2019-04-16 | 唐山钢铁集团有限责任公司 | A kind of Two-cuff Technique roller hearth type heating furnace |
| CN109631574B (en) * | 2018-12-20 | 2024-01-16 | 唐山钢铁集团有限责任公司 | Double heat accumulating roller bottom type heating furnace |
| CN111520719A (en) * | 2020-05-11 | 2020-08-11 | 北京君合悦科技发展有限公司 | Natural gas single heat storage burner |
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Application publication date: 20141022 |