CN102251094B - Heat accumulating type soaking pit furnace capable of combusting low-calorific value coal gas - Google Patents

Heat accumulating type soaking pit furnace capable of combusting low-calorific value coal gas Download PDF

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CN102251094B
CN102251094B CN 201110172887 CN201110172887A CN102251094B CN 102251094 B CN102251094 B CN 102251094B CN 201110172887 CN201110172887 CN 201110172887 CN 201110172887 A CN201110172887 A CN 201110172887A CN 102251094 B CN102251094 B CN 102251094B
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heat
low
temperature
gas
air
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CN102251094A (en
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方成
张学平
谢琳
胡文超
蒋安家
李宁
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BEIJING JINGCHENG FENGHUANG INDUSTRIAL FURNACE ENGINEERING TECHNOLOGY Co Ltd
MCC Capital Engineering and Research Incorporation Ltd
Zhongye Jingcheng Engineering Technology Co Ltd
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BEIJING JINGCHENG FENGHUANG INDUSTRIAL FURNACE ENGINEERING TECHNOLOGY Co Ltd
Zhongye Jingcheng Engineering Technology Co Ltd
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Abstract

The invention discloses a heat accumulating type soaking pit furnace capable of combusting low-calorific value coal gas. The soaking pit furnace comprises a furnace body and a furnace cover, and is provided with a low-temperature heating system and a heat accumulating type high-temperature heating system, wherein the low-temperature heating system is used for heating the soaking pit furnace by using a high-calorific value fuel gas, the heat accumulating type high-temperature heating system is used for heating the soaking pit furnace by using a low-calorific value fuel gas, and the low-temperature heating system and the heat accumulating type high-temperature heating system share air supply and smoke discharging pipelines. In the invention, as a blast-furnace gas needs a higher ignition temperature, and wide and thick plates or steel ingots need to be heated and insulated in different temperature ranges, in order to meet the requirement for heating the wide and thick plates or the steel ingots at a low temperature, both the heat accumulating type high-temperature heating system and the low-temperature heating system are provided in the invention; and moreover the low-temperature heating system and the heat accumulating type high-temperature heating system share the air supply and smoke discharging pipelines, so that the switch between the low-temperature heating system and the heat accumulating type high-temperature heating system can be realized without stopping the furnace.

Description

The regenerative soaking pits of lower heat of combustion coal gas
Technical field
The technology of the present invention relates to a kind of soaking pit of metallurgy industry, the soaking pit that for example is used for Wide and Thick Slab production and Heating Steel Ingots particularly relates to the regenerative soaking pits that a kind of combustion low-heat value gas (such as blast furnace gas) adopts the high-temperature heat accumulation combustion technology, uses high temperature and the two heating systems of low-temperature heat.
Background technology
Soaking pit is a kind of traditional furnace type structure form, at first appears at for 19 end of the centurys, carries out soaking for the steel ingot after the demoulding.In recent years, boats and ships industry and manufacturing maximization, integrated rise, promoted the demand for the Plate rolling processing industry, and soaking pit is owing to can satisfy the heating needs of the required large specification steel billet of Heavy Plate Rolling Line, so, in newly-built Heavy Plate Rolling Line, heating installation all adopts or has reserved the heating process of soaking pit mostly.
Because blast furnace gas at low temperatures (<750 ℃) can not be organized burning, so the soaking pit of existing employing blast furnace gas can't satisfy the requirement of soaking pit low-temperature heat technique usually.
In addition, when adopting pure blast furnace gas to be used for the heating of soaking pit, if not preheating then can not be directly used in the heating of 1320 ℃ on steel ingot.Preheating method before is the regenerative soaking pits that adopts the potter's clay interchanger, since bulky, the reason that air leak rate of air curtain is high, and this technology is eliminated at present.
Summary of the invention
The technical problem that the present invention solves is, a kind of regenerative soaking pits of lower heat of combustion coal gas is provided, and this regenerative soaking pits can satisfy the Heating temperature requirement of soaking pit.
Technical solution of the present invention is: a kind of regenerative soaking pits of lower heat of combustion coal gas, described soaking pit comprises body of heater and bell, wherein, described soaking pit is provided with and utilizes the low-temperature heating system that the high heating value combustion gas heats and the heat-accumulating type high-temperature heating system of utilizing low-heat value gas to heat, and described low-temperature heating system and heat-accumulating type high-temperature heating system share air feed and smoke-exhaust pipeline.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, described heat system comprise that described soaking pit both sides arrange in pairs first, the combination of the second high temperature channel and switching mechanism, described first, the combination of the second high temperature channel includes the air passageways structure that homonymy arranges, the low calorific value coal gas channel structure, described air passageways and air-supply pipeline, smoke-exhaust pipeline links to each other, described low-heat value gas passage and low calorific value coal air pipe, smoke-exhaust pipeline links to each other, described air passageways structure, the low calorific value coal gas channel structure includes the heat storage tank in the outside relatively independent setting of this soaking pit body of heater, and described switching mechanism is so that described first, the second high temperature channel combined and alternatively is as combustion channels combination or discharge flue combination.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, described air passageways structure, low calorific value coal gas channel structure include high temperature gas passage, described heat storage tank and cryogenic gas passage, described heat storage tank comprises accumulation of heat casing and the inner heat storage that arranges thereof, one end of described accumulation of heat casing is provided with the described cryogenic gas passage that links to each other with pipeline, and its other end is provided with the described high temperature gas passage that joins with body of heater; The sidewall of described body of heater one side is provided with respectively the corresponding air jet that joins of air, low calorific value coal gas channel structure and the low-heat value gas spout with the combination of the first high temperature channel, and the sidewall of its opposite side is provided with respectively the corresponding air jet that joins of air, low calorific value coal gas channel structure and the low-heat value gas spout with the combination of the second high temperature channel.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, described switching mechanism comprises the sky of cryogenic gas passage one side of being located at described each air passageways/cigarette reversing valve and is located at the coal of cryogenic gas passage one side of described each low-heat value gas passage/cigarette reversing valve, described sky/cigarette reversing valve connects cryogenic gas passage, air-supply pipeline and the empty smoke pipe road of air passageways, and described coal/cigarette reversing valve connects cryogenic gas passage, supply air line and the coal smoke pipeline of low-heat value gas passage.
The regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 1, it is characterized in that, described low-temperature heating system is included in the low-temperature heat burner that arranges on the furnace wall two side of described soaking pit, and described low-temperature heat burner links to each other with high heating value gas pipeline and air-supply pipeline.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, the bell of described soaking pit is the arch bell, and this bell adopts integrated poured structure, and the hanger brick in it adopts double fastener tubular type hanging structure.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, described double fastener tubular type hanging structure comprises to be hung pipe and two hangs folder, described two hang cross-shaped hanger brick is hung at of folder hangs on the pipe, then carry out integrated poured, the formation bell.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, the fire door of described soaking pit is to be combined by polylith fire door brick, and described body of heater upper end is provided with channel-section steel as the lock hanging structure, and the bottom of described fire door brick is provided with the caulking groove that matches with channel-section steel.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, described fire door brick top is provided with the groove corresponding with the sand seal structure, is provided with bent hanger in the described groove.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, described low-temperature heating system is included in the low-temperature heat burner that arranges on the furnace wall two side of described soaking pit, and described low-temperature heat burner links to each other with high heating value gas pipeline and air-supply pipeline; The bell of described soaking pit is the arch bell, and this bell adopts integrated poured structure, and the hanger brick in it adopts double fastener tubular type hanging structure; Described double fastener tubular type hanging structure comprises to be hung pipe and two hangs folder, and described two hang cross-shaped hanger brick is hung at of folder hangs on the pipe, then carry out integrated poured, the formation bell; The fire door of described soaking pit is to be combined by polylith fire door brick, and the bottom of described fire door brick is provided with the caulking groove that matches with channel-section steel; Be provided with bent hanger in the groove corresponding with the sand seal structure of described fire door brick top.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, the first end scattering device of described heat storage tank has a plurality of described cryogenic gas passages, and the outlet that described cryogenic gas passage is positioned at heat storage tank also is provided with the structure that air-flow is had the dispersion rectifying action.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, described high temperature gas passage and accumulation of heat casing top inner wall are provided with adiabatic liner as insulation construction; The sidewall of described accumulation of heat casing is the integrated poured structure of mould material; Described accumulation of heat casing adopts the fibre module ceiling structure, and its top adopts resistant to elevated temperatures refractory fibre as working lining and thermal insulation layer.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, the high temperature gas passage of each air passageways and/or low-heat value gas passage and burner block curve and join, and the connecting part has flexible sealing structure.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, it is setting up and down with corresponding air jet and tilt to cross that described body of heater is positioned at low-heat value gas spout that homonymy is used.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, have 30~90 ° of large angles of cut between described air jet and low-heat value gas spout, the high-temp combustion that is conducive to sky, coal gas under state under the atmospheric flow fast, fully mix, and for the homogeneity of temperature field in furnace temperature distribution.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, described air jet is similar with the width of low-heat value gas spout or equate.
The regenerative soaking pits of aforesaid lower heat of combustion coal gas, wherein, be provided with the convex rectifier structure between described low-heat value gas spout setting up and down, air jet, form rectifier type spout unitized construction, resistance better, that flow is less so that the burning of air-flow mixes.
Characteristics of the present invention and advantage are as follows:
1. the present invention adopts high temperature and the two heating systems of low temperature.
The kindling temperature of blast furnace gas higher (>750 ℃), and the heating of Wide and Thick Slab or steel ingot need to be at the heat tracing of each temperature section.For satisfying the needs of low-temperature heat, the present invention also is provided with a cover low-temperature heating system in addition except the heat-accumulating type high-temperature heating system is set, and this system and heat-accumulation combustion heat system share air feed and smoke-exhaust pipeline, can realize not blowing out switching.
2. the present invention adopts the regenerative combustion system of high-temperature heat accumulation combustion technology, thereby can utilize low-heat value gas (blast furnace gas) to act as a fuel.
The Heating temperature of soaking pit is higher, when adopting pure blast furnace gas to be used for the heating of soaking pit, if not preheating then can not be directly used in the heating of 1320 ℃ on steel ingot.The present invention adopts modern heat-accumulation combustion mode to realize blast furnace gas is directly used in the full recovery technology of waste heat of heat-processed.
The heat system adopts independent empty, the coal gas heat storage tank with the external passage of high temperature, can be with more than air and the gas preheating to 1000 ℃, because air and coal gas heat storage tank are structures independently separately, the danger of blasting so air and coal gas blending can not occur has guaranteed the security of producing.
Because soaking pit high temperature and furnace gas dust-laden are high, and be both high temperature resistant so heat storage has been selected ball formula heat storage, is convenient to again the replacing of heat storage.
3. the long lifetime arch bell that adopts the double fastener tubular type to hang.
Existing soaking pit adopts flat-top to hang the furnace cover structure of preformed bricks or mould material more, stressedly unreasonablely causes its work-ing life shorter.In order to improve the work-ing life of bell, the present invention changes the flat-top bell into the arch bell, and such structure stress is more reasonable; Simultaneously, change the suspending method of hanger brick into the double fastener tubular type and hang, make the more compact structure of hanging, adapt to the better adaptability that angle changes.
Bell adopts the insulation construction of MULTILAYER COMPOSITE form, and weight is lighter, and heat retaining property is better.
4. adopt changeable type fire door brick, notch lock hanging structure, strengthen maintainable.
The fire door brick of soaking pit is damageable zone, and in order to reduce maintenance cost, the present invention adopts removable preformed bricks structure.Preformed bricks not only can be changed, and uniform specification, also has interchangeability, has made things convenient for local maintain and replace.
Caulking groove is arranged at preformed bricks bottom, in conjunction with channel-section steel lock hanging structure, and the effectively furnace wall introversion that causes of barrier closures sand landing, and the fire door brick is located.
Description of drawings
Fig. 1 is the synoptic diagram of firing system of a specific embodiment of regenerative soaking pits of the present invention.
Fig. 2 is the cross-sectional schematic (not showing that all both sides have shown respectively gas flue and the air passageways of body of heater outside) of a specific embodiment of regenerative soaking pits of the present invention.
Fig. 2 A is the local structure enlarged diagram of Fig. 2.
Fig. 3 is the schematic top plan view of regenerative soaking pits among Fig. 2.
Fig. 3 A is the local structure enlarged diagram of Fig. 3.
Fig. 4 is the local structure synoptic diagram of the accumulation of heat casing of specific embodiment employing of the present invention, has mainly shown mould material and fibre module combined inner lining structural representation.
Fig. 5 is the model synoptic diagram that the large angle of cut is empty, coal gas crosses up and down the rectification spout that a specific embodiment of the present invention adopts.
Fig. 6 is the structural representation of the arch bell that adopts in the specific embodiment of the present invention.
Fig. 6 A is the structural representation that the double fastener tubular type that adopts in the arch bell among Fig. 6 is hung, and wherein also shows bell top and is used for hanging the metallic framework that pipe hangs.
Fig. 6 B is the structural representation of the other direction hung of the double fastener tubular type that adopts in the arch bell among Fig. 6.
Fig. 7 by in the present invention's one specific embodiment the structural representation of employing changeable type fire door brick.
Fig. 7 A is the synoptic diagram that the fire door brick among Fig. 7 is applied to regenerative soaking pits fire door place.
The drawing reference numeral explanation:
10,10 ', 30 ', 30 ', channel architecture 11,11 ', high temperature gas passage
12,12 ', heat storage tank 13,13 ', cryogenic gas passage
103,103 ', 303 ', 303 ', spout 105,105 ', spout section
107,107 ', linkage section 108, bulge-structure
13, cryogenic gas path 10 1, body of heater 102, bell
120, accumulation of heat casing 121, heat storage 122, metallic framework
123, shell 124, adiabatic liner 125, fibre module
126, high temperature steel member 127, sidewall 131, fire door brick
132, double fastener tubular type hanging structure 133, hang pipe 134, hang steel wire
135, hanger brick 136, caulking groove 137, hanger
138, channel-section steel 143, metal furnace shell 144, compound Lining
21, heat system 23, low-temperature heating system 200, soaking pit
211, blast furnace gas passage 212, the first coal/cigarette reversing valve 213, the second coal/cigarette reversing valve
215, air passageways 216, the first sky/cigarette reversing valve 217, the second sky/cigarette reversing valve
222, blast furnace gas pipeline 224, gas pipeline 225, air-supply pipeline
226, burner blower 227, empty smoke pipe road 228, coal smoke pipeline
231, low-temperature heat burner 234, high heating value gas pipeline 271, empty cigarette induced draft fan
273, empty cigarette chimney 281, coal smoke induced draft fan 283, coal smoke chimney
Embodiment
For can clearer understanding technique means of the present invention, and can be implemented according to the content of specification sheets, and for above and other purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and the cooperation accompanying drawing, be described in detail as follows.
As shown in Figure 1, it is the firing system synoptic diagram of the regenerative soaking pits of burning blast furnace gas of the present invention, this soaking pit 200 comprises body of heater and bell (concrete structure is please in conjunction with shown in Figure 2), and soaking pit 200 is provided with and utilizes blast furnace gas the heat-accumulating type high-temperature heating system 21 that heats and the low-temperature heating system 23 that utilizes the high heating value combustion gas to heat, and low-temperature heating system 23 shares air-supply pipeline 225 and smoke-exhaust pipelines (empty smoke pipe road 227) with heat system 21.
In the present embodiment, heat system 21 is preferably first, second high temperature channel combination and the switching mechanism that comprises that soaking pit 200 both sides arrange in pairs, each high temperature channel combination includes the blast furnace gas passage 211 and air passageways 215 that homonymy arranges, blast furnace gas passage 211 links to each other with blast furnace gas pipeline 222 and coal smoke pipeline 228, and air passageways 215 links to each other with air-supply pipeline 225 and empty smoke pipe road 227; Described switching mechanism is so that the combination of first, second high temperature channel can be switched and alternately make up as combustion channels or discharge flue makes up.In the present embodiment, in order to guarantee better smoke evacuation safety, smoke-exhaust pipeline is divided into sky smoke pipe road 227 and coal smoke pipeline 228, respectively with air passageways 215, the 211 corresponding connections of blast furnace gas passage.
Firing system of the present invention is provided with corresponding valve at each pipeline, wherein, the switching mechanism of heat system 21 comprises the sky be located on each air passageways one lateral line/cigarette reversing valve and is located at the coal of each blast furnace gas passage one side/cigarette reversing valve, each sky/cigarette reversing valve connects air passageways, air-supply pipeline and empty smoke pipe road, and each coal/cigarette reversing valve connects blast furnace gas passage, supply air line and coal smoke pipeline.In Fig. 1, this switching mechanism comprises the first coal/cigarette reversing valve 212, the first sky/cigarette reversing valve 216, the second coal/cigarette reversing valve 213, the second sky/cigarette reversing valve 217.Preferably, each reversing valve is two-position three-way valve, comprise a close stance, the action sequence of each reversing valve for example is: close->open a valve plate of T-valve->smoke evacuation->close->open another valve plate of T-valve->the air-supply air inlet, wherein, the first external tapping of the first coal/cigarette reversing valve 212 is connected to the blast furnace gas passage by pipeline, its second external tapping and the 3rd external tapping connect respectively blast furnace gas pipeline and coal smoke pipeline, realize passing into the switching of blast furnace gas/discharge coal smoke function by this reversing valve; The first external tapping of the first sky/cigarette reversing valve 216 is connected to air passageways by pipeline, and its second external tapping and the 3rd external tapping connect respectively air-supply pipeline 225 and empty smoke pipe road 227, realizes passing into the switching of air/empty hood of discharge by this reversing valve.The set-up mode of the second coal of opposite side/cigarette reversing valve 213, the second sky/cigarette reversing valve 217 is similar, repeats no more herein.
As shown in Figure 1, low-temperature heating system 23 is included in the low-temperature heat burner 231 that arranges on the furnace wall two side of soaking pit 200, low-temperature heat burner 231 links to each other with high heating value gas pipeline 234 and air-supply pipeline 225, in the present embodiment, with the fuel of Sweet natural gas as low-temperature heating system, namely this high heating value combustion gas is Sweet natural gas, but is not limited to this.The natural gas burning system that present embodiment is used for the low-temperature heat function disposes independently gas pipeline and airline, utilize natural gas combustion nozzle to realize combustion heat supplying, the airline of natural gas combustion nozzle is a branch line of heat system, namely takes from the air main of heat system.This low-temperature heating system in use, the blast furnace gas part (comprising pipeline and passage) of Regenerative Combustion System is in closing condition, but it is still in running order that the commutation switching of heat-accumulation combustion and air feed, combustion heat supplying and the function of recovering waste heat of natural gas burning system in the time of therefore can realizing low-temperature heat.
High temperature and the two heating systems of low-temperature heat are adopted in preferred embodiment of the present invention, can fully satisfy the needs of low-temperature heat.Low-temperature heating system and Regenerative Combustion System share air feed and smoke-exhaust pipeline, can realize not blowing out switching.
The principle of work of following brief description present embodiment:
For the heat system, the normal temperature air that is blown out by burner blower 226 switches the air passageways (the high temperature channel combination of opposite side has been switched to the smoke evacuation state) that enters this side of body of heater by air supply line 225 through first sky in bodies of heater one sides (as shown in fig. 1 orientation, left side)/cigarette reversing valve 216, in the heat storage of this air passageways, be heated subsequently, thereby within the extremely short time, normal temperature air is heated near furnace temperature, at this moment, because the first coal on this side blast furnace gas pipeline 222/cigarette reversing valve 212 is in Inlet Position, blast furnace gas is entered the blast furnace gas passage of this side by this reversing valve, and in the heat storage tank of this passage, be heated near furnace temperature, therefore, after heated high-temperature hot air enters the soaking pit body of heater, with blast furnace gas mixed firing, simultaneously, the hot flue gas of part after the body of heater internal combustion is at coal smoke induced draft fan 281, the high temperature channel combination that is in the smoke evacuation state through body of heater opposite side (right side shown in Figure 1) under the effect of empty cigarette induced draft fan 271 is expelled to outside coal smoke chimney 283 and the empty cigarette chimney 273, simultaneously the heat storage in blast furnace gas passage and the air passageways is carried out accumulation of heat in this smoke evacuation process.
After the burning scheduled time (such as 120-150s), can close this first coal/cigarette reversing valve 212, the first sky/cigarette reversing valve 216, the recycling switching mechanism switches to the smoke evacuation state with this side high temperature channel combination, and the combination of opposite side high temperature channel is switched to air-suction state, thereby the conversion of practical function, by the heat storage of finishing accumulation of heat the gas of inputting is heated rapidly, make it be warming up to level near furnace temperature, be beneficial to realize the heat burning, so namely finish the high-temperature heat accumulation combustion processes of one-period.
When needs carry out low-temperature heat, should close blast furnace gas pipeline and the coal smoke pipeline of heat-accumulation combustion, open gas pipeline and air-supply pipeline, utilize the natural gas combustion nozzle of sidewall of the furnace body to realize combustion heat supplying, at this moment, the air-supply pipeline of both sides and relevant reversing valve normal operation, namely the air passageways of a side (as shown in fig. 1 left side) switches to the air intake position by reversing valve, the air passageways of opposite side (as shown in fig. 1 right side) switches to the smoke evacuation position by the reversing valve of correspondence, realizes the function of smoke evacuation and accumulation of heat; After work for some time, the reversing valve that the air passageways of one side is corresponding switches to the smoke evacuation position, and the reversing valve that the air passageways of opposite side is corresponding switches to the air intake position, because the heat storage tank of this air passageways has carried out the smoke evacuation accumulation of heat before this, therefore, the normal temperature air that can be entered this moment was heated near furnace temperature within the extremely short time, and the part of required air participates in burning when burning as natural gas combustion nozzle, is beneficial to flue gas waste heat recovery.
After utilizing low-temperature heating system to carry out the heating or soaking of for some time, further the products such as the steel ingot in the stove or Wide and Thick Slab are carried out heat such as need, then only need close gas pipeline, and being carried out suitable switching, heat system (especially blast furnace gas pipeline) can realize, because its implementation is consistent with aforementioned content, repeats no more herein.
In the present embodiment, can utilize low-temperature heating system 23 to realize heating or the soaking of 800 ℃ of following temperature, utilize the heat system realize 800 ℃~1320 ℃ between heating or the soaking of temperature, thereby realize the two heating functions of high low temperature.
As shown in Figure 1, present embodiment also is provided with manual intercepting valve (band " M " symbol), detector unit (band " P " symbol), motor valve (band " V " symbol) etc. as required on each blast furnace gas pipeline, each airline, be beneficial to control and repair and maintenance to the integral combustion system.But those skilled in the art is according to aforementioned content and the setting of accurate understanding related valves of accompanying drawing, so repeat no more.
As shown in Figure 1, present embodiment combustion low-heat value gas (such as blast furnace gas), the regenerative combustion system of employing high-temperature heat accumulation combustion technology is equipped with independently space gas heat storage tank, cooperates the use of reversing valve, finishes the high-temperature heat accumulation combustion function.
In addition, be used for the fuel of low-temperature heat except using the Sweet natural gas, can also use the geseous fuel of other high heating value, such as coke-oven gas, mixed gas, town gas etc., and, the used fuel of Regenerative Combustion System also can use other low-calorie geseous fuel, such as producer gas etc.
As shown in Figure 2, it is the structural representation of a specific embodiment of regenerative soaking pits of the present invention.In the present embodiment, the sidewall of the furnace body of soaking pit is provided with low-temperature heat burner 14, and its concrete set-up mode can with reference to other embodiment, repeat no more herein, the principal feature of present embodiment is that each channel architecture of its heat system is equipped with the heat storage tank that is independent of body of heater.
Particularly, in this embodiment of the present invention, soaking pit comprises body of heater 101 and bell 102, the body of heater of soaking pit comprises metal furnace shell 143 and inner compound Lining 144 thereof, and its heat system adopts is with the external passage of high temperature and adopts independent empty, the coal gas heat storage tank of ball formula heat storage.Shown in Fig. 2 A to Fig. 3 A, the heat system of soaking pit comprises first of the paired setting of soaking pit one side, second passage structure 10,10 ' with and relative opposite side arrange in pairs the 3rd, four-way structure 30,30 ', first, second passage structure and the 3rd, the basic structure of four-way structure is identical, include high temperature gas passage 11, heat storage tank 12 and cryogenic gas passage 13, each heat storage tank 12 comprises accumulation of heat casing 120 and the inner heat storage 121 that arranges thereof, one end of accumulation of heat casing 120 is provided with the cryogenic gas passage 13 that links to each other with pipeline, and its other end is provided with the high temperature gas passage 11 that joins with body of heater 101; Corresponding first channel structure 10 is provided with for the first spout 103 that joins with the first channel structure on the sidewall of body of heater 101 1 sides, corresponding second passage structure 10 ' is provided with for the second spout 103 ' that joins with the second passage structure, in like manner, corresponding the 3rd on the sidewall of its opposite side, four-way structure the 4th spout 303 ' that is provided with for the 3rd spout 303 that joins with third channel structure 30 and is used for joining with four-way structure 30 '.
In the present embodiment, with the fuel of blast furnace gas as the heat system, therefore, above-mentioned first, second channel architecture reality is corresponding to blast furnace gas passage, air passageways, the first spout 103, the 3rd spout 303 are the blast furnace gas spout, and the second spout 103 ', the 4th spout 303 ' are air jet.The below is elaborated for concrete composition and the characteristics of each channel architecture.
Shown in Fig. 3, Fig. 3 A, in the present embodiment, each high temperature gas passage 11 is to curve with body of heater 101 to join, as shown in the figure, high temperature gas passage 11 is to be connected to body of heater 101 after through twice bending at bearing of trend, can effectively absorb structural stress and the strain that high temperature channel at high temperature produces because of temperature expansion like this; In addition, see also shown in Fig. 2 A, the two A place, connecting part is carried out flexible sealing process, to guarantee sealing effectiveness.As for concrete structure and technique that flexible sealing is processed, those skilled in the art can adopt prior art to realize fully, repeats no more herein.
Alternatively, please refer to shown in Fig. 2, Fig. 2 A, the first end scattering device of this blast furnace gas heat storage tank 12 has a plurality of cryogenic gas passages 13.
Please in conjunction with shown in Figure 4, it is the local structure synoptic diagram of the accumulation of heat casing of specific embodiment employing of the present invention, has mainly shown mould material and fibre module combined inner lining structural representation.This accumulation of heat casing 120 comprises metallic framework 122, shell 123 and inner adiabatic liner 124.See also Fig. 4, high temperature gas passage 11 is together to make to stay to establish with accumulation of heat casing 120, and in the high temperature gas passage 11 and accumulation of heat casing 120 top inner wall preferably be equipped with adiabatic liner as insulation construction.
As shown in Figure 4, the sidewall 127 of accumulation of heat casing 120 is preferably the integrated poured structure of mould material, further, its sidewall can adopt the high-strength light mould material that intensity is high, thermal conductivity is low (such as light mullite pouring material etc.) cast, and available high temperature steel anchoring hook 129 is as anchoring piece.Preferably, accumulation of heat casing 120 is to adopt the fibre module ceiling structure, particularly, its top adopts lightweight, resistant to elevated temperatures refractory fibre as the fire-resistant working lining and the thermal insulating warm-keeping layer that contact with high-temperature gas, be preferably the special type fire fiber of heatproof more than 1350 ℃, be suspended on the top metal skeleton 122 with high temperature steel anchoring piece 129, and 125 of each fibre modules adopt high temperature steel member 126 interspersed fixing.Certainly, the material identical with sidewall and structure also can be adopted in the top of this accumulation of heat casing 120, as adopt the mode of integrated poured or sequential casting, give unnecessary details no longer one by one herein.
Based on the channel architecture with above-mentioned formation characteristics, please in conjunction with Fig. 3 A, shown in Figure 5, in the specific embodiment of the present invention, form spout unitized construction empty, that combustion gas crosses up and down between the first spout 103 that the high temperature gas passage 11,11 ' with this blast furnace gas passage, air passageways of body of heater 101 homonymies is connected, the second spout 103 ', be beneficial to quick, the fully mixing of high-temp combustion under the atmospheric flow status.
In the specific embodiment of the present invention, corresponding to the combustion gas spout of a certain high temperature channel combination with air jet is setting up and down and tilt to cross formation spout unitized construction.Be combined as example with the first high temperature channel, first (combustion gas) spout 103 corresponding with it and second (air) spout 103 ' are setting up and down and the state that tilts to cross forms the spout unitized construction.
Again in conjunction with aforementioned channels structure and body of heater in conjunction with characteristics, because each high temperature gas passage is to curve with body of heater 101 to join, therefore, close two nozzles of body of heater 101 have the spout section 105,105 ' of inclination, two spout sections 105,105 ' tilt to intersect, and form the spout unitized construction.Preferably, for the ease of joining smoothly of body of heater and each channel architecture, in the present embodiment, between two spout sections 105,105 ' and two high temperature gas passages 11,11 ', this body of heater also is provided with straight linkage section 107,107 ', two linkage sections 107,107 ' are parallel to each other, and are in the vertical direction relation setting up and down.
In the specific embodiments of the invention, two spout sections 105,105 ' centreline space have the large angle of cut that is preferably between 30~90 °, for example can adopt about 45 ° large angle of cut, thereby be conducive to quick, the fully mixing of high-temp combustion under the atmospheric flow status of sky, coal gas, and can improve the homogeneity of temperature field in furnace temperature distribution.
In order further to strengthen the homogeneity of fast, fully mixing and improve temperature field in furnace temperature distribution of high-temp combustion under the atmospheric flow status empty, coal gas, the second spout 103 ' and the width of the first spout 103 are preferably and keep close or equate, in height then do not have specific requirement, can determine as required.
For the burning that makes air-flow mixes better, the resistance that flows is less, among the present invention, this spout unitized construction is preferably rectifier type spout unitized construction, that is first (combustion gas) spout 103 setting up and down, be provided with rectifier structure between second (air) spout 103 ', form the rectifier type spout structure, this rectifier structure is preferably the structure with level and smooth convex surface, for example can be the arcuation convex surface, be preferably semi-cylindrical bulge-structure 108 as shown in Figure 5, certainly, also can be Polygons and carry out the convex surface that smoothing processing is crossed, as can be trapezoidal, the formation such as trilateral seamlessly transit convex surface, this arcuation convex surface is positioned between the first spout 103 and the second spout 103 ', thereby the better high quality that is conducive to air-flow mixes.
As shown in FIG., the implementation procedure of high-temperature heat accumulation burning is the handoff functionality by reversing valve, makes the air heat storage tank of a side and coal gas heat storage tank be in air infeed and coal gas infeed state, by the spout in the stove, fuel is fed in the stove, realizes combustion heat supplying.Simultaneously, the air heat storage tank of opposite side and coal gas heat storage tank aspirate the waste gas that burning produces by the spout in the stove and high temperature channel, make waste gas to the heat storage accumulation of heat in the heat storage tank, and the waste gas that will realize regenerative heat exchange passes through respectively empty cigarette and coal smoke pipeline with extremely low temperature (150 ℃), pass through induced draft fan and smoke stack emission in atmosphere, thereby realized the combustion heat supplying of a side.Through after the regular hour (120~150s), the commutation function by reversing valve again, the burning infeed state of one side is switched to the exhaust gas emission state, exhaust gas emission state with opposite side switches to burning infeed state simultaneously, the mode that realizes and above-described similar, like this, just finished the heat-accumulation combustion process of one-period.
From the above, present embodiment adopts the heat storage tank of monomer (being independent of body of heater), thereby obtains a kind of large section, atmospheric exchange capacity heat-accumulation combustion equipment, so that the interior passageway size of section area can be greater than 1m 2, can be 1.5m 2More than, reach 2.88m in the Application Example of the present invention 2, the exchange capacity of gas can reach 12000Nm 3/ h, this is that existing heat storage type combustion equipment can't be realized.
In conjunction with shown in Figure 6, it is the structural representation of the arch bell that adopts in the specific embodiment of the present invention.In the present embodiment, in order to improve the work-ing life of bell, the flat-top furnace cover structure that present embodiment will have soaking pit now changes the arch furnace cover structure into, and this bell adopts integrated poured structure, thereby so that it is stressed more reasonable.
On the other hand, as shown in Figure 6A, present embodiment changes the suspending method of hanger brick 135 into the double fastener tubular type and hangs, each double fastener tubular type hanging structure 132 comprises that hanging two of pipe 133 and hanger brick two ends hangs folder, in one specific embodiment, two hang the folder be by hanging the steel wire 134 cross-shaped hanging portions that are set around both sides, hanger brick top, and intersect hang steel wire 134 two ends after fixing hook respectively hook establish to be fixed in and hang pipe 133 positions corresponding to each hanger brick two ends, hang and form the double fastener tubular type, thereby with hanger brick 135 be hung at hang the pipe 133 on, make hanging structure compacter, for the better adaptability of angle variation.
Utilize the double fastener tubular type to hang hanger brick 135 is hung at and carry out after hanging on the pipe 133 integrated pouredly, form bell 102.The insulation construction of bell is preferably and adopts the MULTILAYER COMPOSITE form, so that weight is lighter, heat retaining property is better.
For another example shown in Fig. 7, Fig. 7 A, it is the changeable type fire door brick 131 that adopts in the specific embodiment of regenerative soaking pits of the present invention and the synoptic diagram of lock hanging structure.Because the fire door brick of soaking pit is damageable zone, in order to reduce maintenance cost, present embodiment adopts removable preformed bricks structure, the fire door that is soaking pit is to be combined by polylith fire door brick 131, thereby so that preformed bricks not only can be changed, and uniform specification, also have interchangeability, made things convenient for local maintain and replace.
Further, channel-section steel lock hanging structure can be set at the fire door place of body of heater 101, namely channel-section steel 138 is set as the lock hanging structure in body of heater 101 upper ends, the bottom of fire door brick 131 is preferably and is provided with the caulking groove 136 that matches with channel-section steel 138, channel-section steel 138 is arranged at the body of heater upper end, and the one end is fixedly welded on the body of heater shell 143, and the other end is for combining with the caulking groove 136 of fire door brick 131 bottoms, thereby the effectively furnace wall introversion that causes of barrier closures sand landing, and can make reliably fire door brick location.
Preferably, be provided with bent hanger 137 in the groove corresponding with the sand seal structure of fire door brick 131 tops, when installing and changing this fire door brick 131 so that this hanger 137 is upright, in order to provide better lifting to fix; To be installed complete, its bending level can be, and the sand seal effect can not be affected.
Present embodiment can adopt rational scantlings of the structure and fixedly lock hanging mode according to actual needs, is convenient to replacing and the maintenance of fire door brick, thereby can reduces maintenance cost, increases economic efficiency.
In sum, the present invention proposes a kind of use low-heat value gas (such as blast furnace gas) and adopt the soaking pit of modern heat accumulating type commutation high-temp combustion technology.Soaking pit need not to stay establishes extra discharge flue (conventional flue), and the fume afterheat that burning produces can all be recycled, and has high heating efficiency.
Consider blast furnace gas usually at low temperatures (<750 ℃) can not organize burning, so, in order to satisfy the requirement of soaking pit low-temperature heat technique, firing system also has been equipped with the natural gas burning system that is applicable to low-temperature heat, to satisfy the needs of low-temperature heat.Therefore, this firing system is the two heating systems of high low temperature with high temperature and low-temperature heat function.In addition, in order to guarantee the efficiency of combustion of blast furnace gas, the present invention has adopted the high-temperature heat accumulation combustion technology of lower heat of combustion coal gas (blast furnace gas), and this firing system is with the external passage of high temperature, and arranges and adopt ball formula sky heat storage and that be independent of body of heater, coal gas heat storage tank.
For use properties and the life-span of improving soaking pit, preferred embodiment of the present invention also improves bell and the fire door brick structure of soaking pit, long lifetime arch bell that the double fastener tubular type hangs and notch lock hanging structure, changeable type fire door brick have been adopted respectively, thereby make the structure of soaking pit more reasonable, but decrease maintenance cost.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, any those skilled in the art are not within breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention,, all still belong in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment does according to technical spirit of the present invention.

Claims (14)

1. the regenerative soaking pits of a lower heat of combustion coal gas, described soaking pit comprises body of heater and bell, it is characterized in that, described soaking pit is provided with and utilizes the low-temperature heating system that the high heating value combustion gas heats and the heat-accumulating type high-temperature heating system of utilizing low-heat value gas to heat, and described low-temperature heating system and heat-accumulating type high-temperature heating system share air feed and smoke-exhaust pipeline; Wherein said heat system comprise that described soaking pit both sides arrange in pairs first, the combination of the second high temperature channel and switching mechanism, described first, the combination of the second high temperature channel includes the air passageways structure that homonymy arranges, the low calorific value coal gas channel structure, described air passageways structure and air-supply pipeline, smoke-exhaust pipeline links to each other, described low calorific value coal gas channel structure and low calorific value coal air pipe, smoke-exhaust pipeline links to each other, described air passageways structure, the low calorific value coal gas channel structure includes high temperature gas passage, the cryogenic gas passage reaches the heat storage tank in the outside relatively independent setting of this soaking pit body of heater, described heat storage tank comprises accumulation of heat casing and the inner heat storage that arranges thereof, one end of described accumulation of heat casing is provided with the described cryogenic gas passage that links to each other with pipeline, and its other end is provided with the described high temperature gas passage that joins with body of heater; The sidewall of described body of heater one side is provided with respectively the corresponding air jet that joins of air, low calorific value coal gas channel structure and the low-heat value gas spout with the combination of the first high temperature channel, the sidewall of its opposite side is provided with respectively the corresponding air jet that joins of air, low calorific value coal gas channel structure and the low-heat value gas spout with the combination of the second high temperature channel, described switching mechanism so that described first, second high temperature channel combined and alternatively as combustion channels combination or discharge flue combination; Described low-temperature heating system is included in the low-temperature heat burner that arranges on the furnace wall two side of described soaking pit, and described low-temperature heat burner links to each other with high heating value gas pipeline and air-supply pipeline.
2. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 1, it is characterized in that, described switching mechanism comprises the sky of cryogenic gas passage one side of being located at described air passageways structure/cigarette reversing valve and is located at the coal of cryogenic gas passage one side of described low calorific value coal gas channel structure/cigarette reversing valve, described sky/cigarette reversing valve connects cryogenic gas passage, air-supply pipeline and the empty smoke pipe road of air passageways structure, and described coal/cigarette reversing valve connects cryogenic gas passage, supply air line and the coal smoke pipeline of low calorific value coal gas channel structure.
3. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 1 is characterized in that, the bell of described soaking pit is the arch bell, and this bell adopts integrated poured structure, and the hanger brick in it adopts double fastener tubular type hanging structure.
4. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 3, it is characterized in that described double fastener tubular type hanging structure comprises that hanging pipe and two hangs folder, described two hang cross-shaped hanger brick is hung at of folder hangs on the pipe, then carry out integrated pouredly, form bell.
5. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 1, it is characterized in that, the fire door of described soaking pit is to be combined by polylith fire door brick, and described body of heater upper end is provided with channel-section steel as the lock hanging structure, and the bottom of described fire door brick is provided with the caulking groove that matches with channel-section steel.
6. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 5 is characterized in that, described fire door brick top is provided with the groove corresponding with the sand seal structure, is provided with bent hanger in the described groove.
7. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 2, it is characterized in that, described low-temperature heating system is included in the low-temperature heat burner that arranges on the furnace wall two side of described soaking pit, and described low-temperature heat burner links to each other with high heating value gas pipeline and air-supply pipeline; The bell of described soaking pit is the arch bell, and this bell adopts integrated poured structure, and the hanger brick in it adopts double fastener tubular type hanging structure; Described double fastener tubular type hanging structure comprises to be hung pipe and two hangs folder, and described two hang cross-shaped hanger brick is hung at of folder hangs on the pipe, then carry out integrated poured, the formation bell; The fire door of described soaking pit is to be combined by polylith fire door brick, and the bottom of described fire door brick is provided with the caulking groove that matches with channel-section steel; Be provided with bent hanger in the groove corresponding with the sand seal structure of described fire door brick top.
8. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 1, it is characterized in that, the first end scattering device of described heat storage tank has a plurality of described cryogenic gas passages, and the outlet that described cryogenic gas passage is positioned at heat storage tank also is provided with the structure that air-flow is had the dispersion rectifying action.
9. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 8 is characterized in that, described high temperature gas passage and accumulation of heat casing top inner wall are provided with adiabatic liner as insulation construction; The sidewall of described accumulation of heat casing is the integrated poured structure of mould material; Described accumulation of heat casing adopts the fibre module ceiling structure, and its top adopts resistant to elevated temperatures refractory fibre as working lining and thermal insulation layer.
10. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 1 is characterized in that, the high temperature gas passage of each air passageways and/or low-heat value gas passage and burner block curve and join, and the connecting part has flexible sealing structure.
11. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 1 is characterized in that, it is setting up and down with corresponding air jet and tilt to cross that described body of heater is positioned at low-heat value gas spout that homonymy is used.
12. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 1, it is characterized in that, have 30~90 ° of large angles of cut between described air jet and low-heat value gas spout, the high-temp combustion that is conducive to air, coal gas under the atmospheric flow status fast, fully mix, and for the homogeneity of temperature field in furnace temperature distribution.
13. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 1 is characterized in that, described air jet is similar with the width of low-heat value gas spout or equate.
14. the regenerative soaking pits of lower heat of combustion coal gas as claimed in claim 11, it is characterized in that, be provided with the convex rectifier structure between described low-heat value gas spout setting up and down, air jet, form rectifier type spout unitized construction, resistance better, that flow is less so that the burning of air-flow mixes.
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CN106402870A (en) * 2016-11-23 2017-02-15 北京京诚凤凰工业炉工程技术有限公司 Air-coal double heat accumulation burner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2040623U (en) * 1988-09-12 1989-07-05 唐山钢铁公司 Sintering ignition thermal insulation furnace
EP0609649A1 (en) * 1993-02-03 1994-08-10 IRITECNA Società per l'Impiantistica Industriale e l'Assetto del Territorio per Azioni Walking-beam furnace for the accelerated heating of billets or the like
CN2708125Y (en) * 2004-04-22 2005-07-06 长沙欣业天宸炉窑工程有限公司 Low-heat value gas thermal storage type sintering machine ignition furnace
CN202116623U (en) * 2011-06-24 2012-01-18 北京京诚凤凰工业炉工程技术有限公司 Heat storage type soaking pit combusting gas with low heat value

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2040623U (en) * 1988-09-12 1989-07-05 唐山钢铁公司 Sintering ignition thermal insulation furnace
EP0609649A1 (en) * 1993-02-03 1994-08-10 IRITECNA Società per l'Impiantistica Industriale e l'Assetto del Territorio per Azioni Walking-beam furnace for the accelerated heating of billets or the like
CN2708125Y (en) * 2004-04-22 2005-07-06 长沙欣业天宸炉窑工程有限公司 Low-heat value gas thermal storage type sintering machine ignition furnace
CN202116623U (en) * 2011-06-24 2012-01-18 北京京诚凤凰工业炉工程技术有限公司 Heat storage type soaking pit combusting gas with low heat value

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