CN103940248B - A kind of heat accumulating type electric boiler flue gas waste heat recovery system - Google Patents
A kind of heat accumulating type electric boiler flue gas waste heat recovery system Download PDFInfo
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- CN103940248B CN103940248B CN201410141897.XA CN201410141897A CN103940248B CN 103940248 B CN103940248 B CN 103940248B CN 201410141897 A CN201410141897 A CN 201410141897A CN 103940248 B CN103940248 B CN 103940248B
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention provides a kind of heat accumulating type electric boiler flue gas waste heat recovery system, comprise rectilinear connection flue, heat accumulating type water-cooling sedimentation room, heat convection waste heat boiler, feed-water heater and steam accumulator etc.; After flue gas in combustion settling chamber flows through rectilinear connection flue, through heat accumulating type water-cooling sedimentation room, flue-gas temperature and flow velocity are tentatively integrated, then drain into air after entering heat convection waste heat boiler, feed-water heater cooling and deduster dedusting successively.Former water enters deoxygenation in oxygen-eliminating device after feed-water heater heats up, then flowing through heat convection waste heat boiler and heat accumulating type water-cooling sedimentation room and producing saturated vapor sends in steam accumulator, after steam accumulator buffering, enter overheated stable output superheated steam in superheater again.The present invention, by arranging heat accumulating type water-cooling sedimentation room and steam accumulator two kinds of peak clipping Pinggu measures, by the fume afterheat of the fluctuation instability that electric furnace produces, exports steadily effective superheated steam by heat accumulating type electric boiler flue gas waste heat recovery system.
Description
Technical field
The present invention relates to the technical field that industrial afterheat recovery utilizes, particularly a kind of heat accumulating type electric boiler flue gas waste heat recovery system.
Background technology
At present, domestic iron and steel enterprises is lower electric furnace steel making cost further, and electric furnace operation generally occurs that scrap smelting pattern converted by molten iron, and molten iron proportion up to 70 ~ 90%, can present the trend of furnace equipment " converter ".Along with electric furnace enters the minimizing of the increase of stove molten iron proportion and steel scrap consumption, cause the concentration of the CO in electric furnace flue gas, temperature and flue gas to increase, reclaim electric furnace flue gas waste heat more meaningful.
Due to the cyclic effects of electric furnace smelting, the fume afterheat of electric furnace generation discontinuity is difficult to recovery and is utilized, discharge through dedusting after the mode of usual employing " water-cooled+air cooling " is cooled to 200 DEG C, a large amount of fume afterheat is dispersed in air through supercooled water, air, causes but furnace flue gas exhaust heat waste of sending a telegram here; Meanwhile, because cooling also needs to increase additional power, water resources consumption.
Current minority electric furnace is by scrap steel preheating mode or heat pipe waste heat boiler recovery section electric furnace flue gas waste heat, and wherein waste steel for electric furnace preheating technology is owing to affecting by factors such as the type of furnace, layout, maintenances, and domestic and international result of use is all undesirable.On the other hand, by adopting heat pipe or convection type waste heat boiler to carry out electric furnace flue gas waste heat recovery, recovered steam enters storage heater, and then heat supply user uses, and electric furnace waste heat recovery achieves certain progress.Although residual neat recovering system is provided with storage heater, because electric furnace recovered steam flow, pressure oscillation cause more greatly being difficult to mate suitable steam user, finally have impact on the actual effect of electric furnace waste heat recovery, cause waste heat recovery efficiency low.Therefore electric furnace waste heat recovery is faced with how the residual heat resources that interval produces to be converted to and stablely exports steam and how to improve the subject matter that electric furnace waste heat recovery efficiency becomes electric furnace flue gas waste heat recovery.
Summary of the invention
A kind of heat accumulating type electric boiler flue gas waste heat recovery system provided by the invention, the superheated steam that electric furnace flue gas waste heat produces steady and continuous is interrupted for reclaiming, its object is to effectively reduce flue-gas temperature, utilize fume afterheat to produce the vapours stablized, improve the efficiency of UTILIZATION OF VESIDUAL HEAT IN; Meanwhile, also in order to solve for the problem that the efficiency of being interrupted electric furnace flue gas waste heat recovery is told somebody what one's real intentions are in prior art,
The invention provides a kind of heat accumulating type electric boiler flue gas waste heat recovery system, superheated steam is produced for reclaiming electric furnace flue gas waste heat, described heat accumulating type electric boiler flue gas waste heat recovery system comprises heat accumulating type water-cooling sedimentation room connected successively, heat convection waste heat boiler and feed-water heater, and the flue gas of described electric furnace discharge flows through after described heat accumulating type water-cooling sedimentation room, heat convection waste heat boiler and feed-water heater carry out heat exchange cooling successively discharges;
Described heat accumulating type electric boiler flue gas waste heat recovery system also comprises oxygen-eliminating device and steam accumulator, described feed-water heater connects water source, current enter described oxygen-eliminating device after described feed-water heater, and the water after described oxygen-eliminating device deoxygenation flows through described heat convection waste heat boiler and heat accumulating type water-cooling sedimentation room respectively;
Described steam accumulator is connected with described heat convection waste heat boiler with described heat accumulating type water-cooling sedimentation room, described steam accumulator collects the steam of described heat accumulating type water-cooling sedimentation room and the generation of described heat convection waste heat boiler, the saturated vapor of stable output after buffering.
Preferably, described heat convection waste heat boiler comprises high-temperature evaporator, superheater, middle cryogenic vaporizer, economizer and main drum, and described high-temperature evaporator, superheater, middle cryogenic vaporizer, economizer are connected to form an exhaust gases passes successively; Current through described oxygen-eliminating device deoxygenation enter in described main drum after described economizer, and described main drum and described high-temperature evaporator are all connected with middle cryogenic vaporizer and form the first steam/water circulating loop; Described main drum is also connected with described steam accumulator, and described superheater is connected with described steam accumulator, and described superheater changes into superheated steam for the saturated vapor heated from described steam accumulator and exports for user.
Preferably, some shock-wave ash-clearing devices are also provided with in described heat convection waste heat boiler, also be provided with some shock-wave ash-clearing devices in described heat convection waste heat boiler, described some shock-wave ash-clearing devices are arranged between the set of heat exchange tubes of described high-temperature evaporator, superheater, middle cryogenic vaporizer, economizer.
Preferably, described heat accumulating type water-cooling sedimentation room comprises:
Water-cooled flue, described electric furnace flue gas flows through described water-cooled flue and transfers heat to the sidewall of described water-cooled flue;
A group or more heat accumulating type trellis, is distributed in described water-cooled flue, and by spaced apart for described water-cooled flue, described flue gas flows through described heat accumulating type trellis;
Auxiliary drum, is connected with the sidewall of described water-cooled flue, is full of water and forms the second steam/water circulating loop between the two in the sidewall of described water-cooled flue and described auxiliary drum; Described auxiliary drum also connects described steam accumulator.
Preferably, described water-cooled flue comprises:
Upper collecting chamber, is connected with described auxiliary drum;
Two groups of water cooled membrane wall, be symmetricly set on the both sides, front and back of described upper collecting chamber, the upper end of described two groups of water cooled membrane wall and described upper collecting chamber are connected to form the passage of a cross section in " Π " shape, described two groups of water cooled membrane wall lower ends are all connected with a lower header, and two described lower headers are all connected with described auxiliary drum;
Some ash buckets, are disposed side by side on the downside of described lower header, and the opening of described ash bucket is towards the bottom of described upper collecting chamber, and described some ash buckets and described upper collecting chamber and described two groups of water cooled membrane wall form a closed channel flowed through for described flue gas.
Preferably, described water cooled membrane wall is made up of some steel pipes, and the upper end of described steel pipe is connected with described upper collecting chamber, and the lower end of described steel pipe is connected with described lower header.
Preferably, the outside of described water-cooled flue is provided with heat-insulation layer.
Preferably, often organize described heat accumulating type trellis to be made up of some ceramic honeycomb bricks.
Preferably, be also disposed with combustion settling chamber between described electric furnace with described heat accumulating type water-cooling sedimentation room and be rectilinearly connected flue.
Preferably, the afterbody of described feed-water heater is also disposed with connected deduster, air exhauster and chimney.
Preferably, described heat accumulating type electric boiler flue gas waste heat recovery system also comprises petticoat pipe, and described petticoat pipe is positioned at the top of described electric furnace, and described petticoat pipe is also connected with described deduster.
Preferably, the bottom of described heat accumulating type water-cooling sedimentation room, heat convection waste heat boiler and feed-water heater is provided with the some ash buckets for reclaiming dust, and described some ash buckets and described heat accumulating type water-cooling sedimentation room, heat convection waste heat boiler and feed-water heater form the closed channel flowed through for flue gas jointly.
This is owing to adopting above technical scheme, and make it compared with prior art, the advantage had and good effect are:
Heat accumulating type electric boiler flue gas waste heat recovery system provided by the invention, carry out the measure of peak clipping Pinggu by arranging multiple heat accumulating type device, on the one hand by adopt heat accumulating type water cooled membrane wall when high temperature when storage compartment heat, low temperature the mode of releasing portion component reduce the impact that electric furnace flue gas fluctuates; On the other hand, the steam that heat accumulating type expansion chamber and heat convection waste heat boiler produce enters steam accumulator and cushions, and reduce further the impact of electric furnace flue gas fluctuation.The fume afterheat of the fluctuation instability produced in electric furnace steel making production process the most at last, by the superheated steam of this regenerative electrochemical furnace flue gas exhaust heat recovery method and system stable output, thus improves fume afterheat utilization ratio.
Accompanying drawing explanation
By reference to the accompanying drawings, by hereafter state detailed description, more clearly can understand this above-mentioned and other feature and advantage, wherein:
Fig. 1 is the structural representation of heat accumulating type electric boiler flue gas waste heat recovery system provided by the invention;
Fig. 2 is the formal figure of heat accumulating type water-cooling sedimentation room of the present invention;
Fig. 3 is the side view of heat accumulating type water-cooling sedimentation room of the present invention.
Symbol description:
1-electric furnace
2-petticoat pipe
3-combustion gas expansion chamber
The rectilinear connection flue of 4-
5-heat accumulating type trellis
6-water cooled membrane wall
7-high-temperature evaporator
8-shock-wave ash-clearing device
Cryogenic vaporizer in 9-
10-economizer
11-feed-water heater
12-deduster
13-air exhauster
14-chimney
15-feed pump
16-oxygen-eliminating device
17-heat convection waste heat boiler
The main drum of 18-
19-assists drum
20-heat accumulating type water-cooling sedimentation room
21-steam accumulator
22-superheater
23-ash bucket.
Detailed description of the invention
See the accompanying drawing that the present embodiment is shown, this hereafter will be described in more detail.But, originally can realize in many different forms, and should not be construed as by the restriction in the embodiment of this proposition.On the contrary, it is abundant and complete open in order to reach for proposing these embodiments, and makes those skilled in the art understand scope of the present invention completely.In these accompanying drawings, for clarity sake, may be exaggerated size and the relative size in layer and region.
Shown in figure 1-3, the invention provides a kind of heat accumulating type electric boiler flue gas waste heat recovery system, the superheated steam that electric furnace flue gas waste heat produces steady and continuous is interrupted for reclaiming, mainly comprise electric furnace 1, heat accumulating type water-cooling sedimentation room 20, heat convection waste heat boiler 17, feedwater heating 11 device, steam accumulator 21 etc., this system can effectively reduce flue-gas temperature, utilize fume afterheat to produce the vapours stablized, improve the efficiency of UTILIZATION OF VESIDUAL HEAT IN.
Concrete, start to be connected with combustion settling chamber 3, rectilinear connection flue 4, heat accumulating type water-cooling sedimentation room 20, heat convection waste heat boiler 17, feedwater heating 11 device, deduster 12 and chimney 14 in turn from the flue gas output channel of electric furnace 1.The high-temperature flue gas produced in electric furnace 1 enters in combustion settling chamber 3, and the flue gas now in combustion settling chamber 3 contains a small amount of gas composition, and temperature reaches as high as 800 ~ 1100 DEG C; From the flue gas that combustion settling chamber 3 exports, first cause in rectilinear connection flue 4, it is thorough that the acting as of rectilinear connection flue 4 makes not clean-burning part coal gas in flue gas in vertical gas pass 4, continue reactive combustion.The bottom of heat accumulating type water-cooling sedimentation room 20, heat convection waste heat boiler 17, feed-water heater 11 is provided with some ash buckets 3, and heat accumulating type water-cooling sedimentation room 20, heat convection waste heat boiler 17, feedwater heating 11 device and some ash buckets 3 form a closed channel flowed through for flue gas jointly, flue gas carries out heat exchange, cooling in the process flowing through this closed flue; The flue gas exported from rectilinear connection flue 4 enters in deduster 12 through heat accumulating type water-cooling sedimentation room 20, heat convection waste heat boiler 17, heating 11 device that feeds water after carrying out heat exchange cooling, and the flue gas after dedusting is sent in chimney 14 by an air exhauster 13 and discharges.
In the present embodiment, as Figure 2-3, heat accumulating type water-cooling sedimentation room 20 comprises water-cooled flue 201, heat accumulating type trellis 5 and auxiliary drum 19.Wherein, water-cooled flue 201 comprises the both sides, front and back that upper collecting chamber 2011 and two groups of water cooled membrane wall, 6, two groups of water cooled membrane wall 6 are symmetricly set on upper collecting chamber 2011, namely arranges along upper collecting chamber 2011 length direction; The upper end of two groups of water cooled membrane wall 6 is connected with upper collecting chamber 2011, and the lower end of two groups of water cooled membrane wall 6 is all connected with a lower header 2013, two groups separately and forms the passage of a cross section in " Π " type between water cooled membrane wall 6 and upper collecting chamber 2011.Some ash buckets 23 are disposed side by side on the downside of lower header 2013, thus the water-cooled flue 201 making upper collecting chamber 2011, water cooled membrane wall 6, close before and after formation about one between lower header 2013 and ash bucket 23, flue gas flows through this passage.
Wherein, often organize the steel pipe that water cooled membrane wall 6 includes some " Γ " types connected side by side, between adjacent each steel pipe, constitute water cooled membrane wall 6 by steel disc integral solder; The upper end of all steel pipes often organized in water cooled membrane wall 6 is all connected with upper collecting chamber 2011, and the lower header 2013 that the lower end of all steel pipes is all corresponding with below this group water cooled membrane wall 6 is connected.Certainly, the structure of steel pipe, size and quantity can adjust as the case may be, are not restricted herein.In the present embodiment, the outside of water-cooled flue 201 is also provided with heat-insulation layer 202, for preventing the passage of the heat of the flue gas flowing through water-cooled flue 201, thus improves the efficiency of flue gas heat recovery.
In the present embodiment, sidewall or the upper end of auxiliary drum 19 are connected with upper collecting chamber 2011 by a tedge 203, two lower headers 2013 are connected respectively by the bottom of a down-comer 204 with auxiliary drum 19, thus are formed: by auxiliary drum 19 → down-comer 204 → lower header 2013 → water cooled membrane wall 5 → upper collecting chamber 2011 → tedge 203 → auxiliary drum 19 form the second steam/water circulating loop; Moisturizing is carried out to this second steam/water circulating, water is input in auxiliary drum 19, water in auxiliary drum 19 flow in lower header 2013, water cooled membrane wall 6 and upper collecting chamber 2011 by down-comer 204 under the effect of self gravitation, in water cooled membrane wall 6, water is become steam water interface density to reduce by flue gas, pressure reduction is formed with auxiliary drum 19, thus making water can enter in water cooled membrane wall 6 and upper collecting chamber 2011, this principle is the general principle of gravity combined-circulation once-through boiler; When high-temperature flue gas flows through water-cooled flue 201, transfer heat to lower header 2013, steel pipe and upper collecting chamber 2011, water in lower header 2013, steel pipe and upper collecting chamber 2011 is heated up evaporate, then evaporating the steam obtained rises in upper collecting chamber 2011, and be input in auxiliary drum 19 by tedge 203, auxiliary drum 19 again by steam Transportation to steam accumulator 21, thus realize the effect of flue gas heat recovery.In the present embodiment, auxiliary drum 19 is positioned at the top of water-cooled flue 201, therefore assist and circulate by the gravity of water between drum 19 and water-cooled flue 201, certainly assist and also promote water circulation by adding water pump between drum 19 and water-cooled flue 201, thus make the present invention be applicable to the situation of various position relationship between auxiliary drum 19 and water-cooled flue, be not restricted herein.
In the present embodiment, some groups of heat accumulating type trellis 5 are arranged in water-cooled flue 201, and arrange along the cross section of water-cooled flue 201, water-cooled flue 201 is divided into some sections, makes flue gas flow through heat accumulating type trellis 5, as shown in Figure 2; The upper end of heat accumulating type trellis 5 is connected with upper collecting chamber 2011, and lower end is connected to the boundary of adjacent ash bucket 23.In the present embodiment, often organize heat accumulating type trellis 5 and turned by several ceramic honeycombs and form, wherein according to the requirement of flue gas resistance and amount of stored heat, several ceramic honeycombs can be turned the heat accumulating type trellis being combined into difformity size; In addition, the present invention also can adopt other heat-storing materials to turn to replace ceramic honeycomb, is not restricted herein.Time flue gas flows through heat accumulating type trellis 5, first, heat accumulating type trellis 5 absorbs heat, plays the effect of accumulation of heat; Secondly, heat accumulating type trellis 5 makes the speed of the flue gas flowed through reduce, on the one hand flue gas is contacted sufficiently uniformly with steel pipe with upper collecting chamber 2011, make the large dust granules preliminary sedimentation in flue gas on the other hand, collected by ash bucket 23, thus alleviate the impact of dust on other equipment of rear portion, reduce dust arrester load.
The present invention carries out the measure of peak clipping Pinggu by arranging heat accumulating type trellis in water-cooled flue, when electric furnace 1 is made steel time, now because flue-gas temperature is high, flow is large, except the partial heat that the water in water-cooled flue 201 absorbs flue gas, heat in flue gas is still sufficient, now heat accumulating type trellis 5 is in heat absorption state, and the heat of part high-temperature flue gas is absorbed by accumulation of heat trellis 2 and stores, thus plays the effect of peak clipping; When electric furnace 1 is when tapping, electric furnace 1 export flue gas temperature compared with low, flow is little, flue gas transfers heat to the water in water-cooled flue 201 by the mode of heat convection, temperature now due to the flue gas flowed through is lower, accumulation of heat trellis 2 is in heat release state, transfers heat to the water in water-cooled flue 201 mainly through radiation heat transfer mode.As can be seen here, the high temperature section flue gas waste heat recovery of the fluctuation instability produced in electric furnace 1 production process stores by adopting heat accumulating type expansion chamber by the present invention, release when flue-gas temperature declines during tapping, not only increase high-temperature flue gas waste heat recovery, and be conducive to reducing electric furnace heat recovery steam fluctuating range, be convenient to vapour system stable operation.Thus have and the residual heat resources that gap produces are converted to stable steam export, and improve the effect of electric furnace waste heat recovery efficiency.
In the present embodiment, heat convection waste heat boiler 17 is steam for the converting heat of recovered flue gas, it mainly comprises the high-temperature evaporator 7, superheater 22, middle cryogenic vaporizer 9 and the economizer 10 that are connected successively, also comprises the main drum 18 be all connected with high-temperature evaporator 7, middle cryogenic vaporizer 9 and economizer 10.Concrete, the flue of high-temperature evaporator 7 is connected with the flue of heat accumulating type water-cooling sedimentation room 20, the flue of economizer 10 is connected with the flue of feed-water heater 11, after the flue gas of heat accumulating type water-cooling sedimentation room 20 outflow flows through high-temperature evaporator 7, superheater 22, middle cryogenic vaporizer 9 and economizer 10 successively, flow through feed-water heater 11.Feed-water heater 11 connects water source, and first water source flows in feed-water heater 11, for absorbing the heat of the flue gas through feed-water heater 11; By the water flowed out in feed-water heater 11, enter an oxygen-eliminating device 16 and carry out deoxygenation, the water after deoxygenation flows into economizer 10 by a feed pump 15; The water flowed out from economizer 10 enters in main drum 18, and main drum 18 and high-temperature evaporator 7, form the first steam/water circulating loop respectively between middle cryogenic vaporizer 9, its circulation theory can refer to the second steam/water circulating loop between auxiliary drum 19 and water-cooled flue 201, repeats no more herein.Main drum 18 is connected with auxiliary drum 19, for auxiliary drum 19 provides water source; Main drum is also connected with steam accumulator 21, by the steam Transportation that obtained by heat exchange to steam accumulator 21; Steam accumulator 21 is also connected with superheater 22, the saturated vapor collected in main drum 18 and auxiliary drum 19 is input to superheater 22 by steam accumulator 21, heat with flue gas heat exchange gained is heated saturated vapor by superheater 22, exports work user use to obtain superheated steam.In the present embodiment, superheater 22 is arranged between high-temperature evaporator 7 and middle cryogenic vaporizer 9, is that flue-gas temperature in order to prevent from flowing through superheater 22 is too high and affect the quality of steam; Certainly, superheater 22 also can be arranged on before high-temperature evaporator 7 or after middle cryogenic vaporizer 9, is not restricted herein, can decide the setting position of superheater 22 according to the quality flowing through flue gas.
In the present embodiment, some shock-wave ash-clearing devices 8 are also provided with in heat convection waste heat boiler 17, some shock-wave ash-clearing devices 8 are arranged on high-temperature evaporator 7, superheater 22, middle cryogenic vaporizer 9, economizer 10, flow through dust stratification on the inner surface of passage for removing heat convection waste heat boiler 17 flue gas, thus ensure that the reliable of heat convection waste heat boiler 17 effectively runs.In the present embodiment, the top of electric furnace 1 is also provided with a large petticoat pipe 2, and petticoat pipe 2 is connected with deduster 12, the flue gas that petticoat pipe 2 spills for reclaiming electric furnace 1, discharges after dedusting.
A kind of heat accumulating type electric boiler flue gas waste heat recovery system provided by the invention, be mainly divided into flue gas heat exchange and stable steam to produce two working portions, the operation principle below with regard to these two working portions is described in detail:
One, flue gas heat exchange working portion
The high-temperature flue gas produced in electric furnace 1 is disposed in combustion settling chamber 3, and part coal gas not clean-burning in flue gas through rectilinear connection flue 4, and burns away thoroughly by the flue gas extracted out by combustion settling chamber 3 in rectilinear connection flue 4.First the flue gas that rectilinear connection flue 4 exports enters in heat accumulating type water-cooling sedimentation room 20, transfers heat to water cooled membrane wall 6 and heat accumulating type trellis 5, makes flue-gas temperature tend to evenly, reduce the fluctuating range of equipment steam generation below; Simultaneously heat accumulating type trellis 5 be arranged so that flue gas flow rate declines, large dust granules sedimentation is collected by ash bucket 23, alleviates rear portion boiler abrasion and load of dust remove.
Flue gas enters in heat convection waste heat boiler 17 behind heat accumulating type water-cooling sedimentation room 20, further carry out exchange heat respectively by high-temperature evaporator 7, superheater 22, middle cryogenic vaporizer 9 and economizer 10, the some ash buckets 23 while of recovery heat bottom heat convection waste heat boiler 17 carry out the recovery of dust.The flue gas exported from heat accumulating type water-cooling sedimentation room 20 is again through feed-water heater 11, and feed-water heater 11 carries out heat exchange equally, collects flue gas heat, makes flue gas be reduced to less than 150 DEG C, flue-gas temperature can be prevented too high simultaneously, scorch fume emission equipment below.Flue gas is admitted in deduster 12 after last cooling, carries out the flue gas after dedusting and is discharged in air by chimney 14 under the effect of air exhauster 13.
Two, stablize steam and produce working portion
Water source is input in feed-water heater 11, is tentatively heated; Obtain the water after certain heat by after oxygen-eliminating device 16 deoxygenation, be admitted in heat convection waste heat boiler 17; Water after concrete deoxygenation first flows through economizer 10 and is heated, and then flow in main drum 18; Realize Water, steam circulation between water in main drum 18 and high-temperature evaporator 7, middle cryogenic vaporizer 9 and form steam, vapor stream is got back in main drum 18, and the steam in main drum 18 is fed to again steam accumulator 21 and stores.Water in main drum 18 also provides water source for auxiliary drum 19, the water flowing through water cooled membrane wall 6 is heated up and evaporates, obtain steam in auxiliary drum 20 in auxiliary drum 20, and by steam Transportation to steam accumulator 21.Steam accumulator 21 collects the saturated vapor of main drum 18 and auxiliary drum 19 generation, after band is stable in input superheater 22, obtain superheated steam, and the superheated steam of stable output is for user after superheater 22 heating.
Wherein, the aft mounted feed-water heater 11 of heat convection waste heat boiler 17 tentatively heats inflow water source, the former water of about 20 DEG C is avoided directly to send in heat convection waste heat boiler 17, easily cause heat convection waste heat boiler 17 tube wall temperature to cause the generation of dew point corrosion phenomenon lower than flue gas dew point temperature, finally affect service life of equipment.
To sum up, a kind of heat accumulating type electric boiler flue gas waste heat recovery system provided by the invention, the measure of peak clipping Pinggu is carried out by arranging multiple heat accumulating type device, on the one hand by adopting heat accumulating type water-cooling sedimentation room mode of releasing portion component when storage compartment heat, low temperature when high temperature, decrease the impact of electric furnace flue gas fluctuation; On the other hand, the steam that main drum 18 and auxiliary drum 19 produce is entered in steam accumulator 21 and cushions, reduce further the impact of electric furnace flue gas fluctuation.The fume afterheat of the fluctuation instability produced in electric furnace steel making production process the most at last, by the superheated steam of recovery system stable output provided by the invention, improves fume afterheat utilization ratio.
Those skilled in the art should be understood that and originally can realize with other concrete forms many and not depart from spirit or scope originally.Although also have been described this embodiment, should be understood this and should not be restricted to these embodiments, within these spirit and scope that those skilled in the art can define as appended claims, make change and amendment.
Claims (11)
1. a heat accumulating type electric boiler flue gas waste heat recovery system, superheated steam is produced for reclaiming electric furnace flue gas waste heat, it is characterized in that, described heat accumulating type electric boiler flue gas waste heat recovery system comprises heat accumulating type water-cooling sedimentation room connected successively, heat convection waste heat boiler and feed-water heater, and the flue gas of described electric furnace discharge flows through after described heat accumulating type water-cooling sedimentation room, heat convection waste heat boiler and feed-water heater carry out heat exchange cooling successively discharges;
Described heat accumulating type electric boiler flue gas waste heat recovery system also comprises oxygen-eliminating device and steam accumulator, described feed-water heater connects water source, current enter described oxygen-eliminating device after described feed-water heater, and the water after described oxygen-eliminating device deoxygenation flows through described heat convection waste heat boiler and heat accumulating type water-cooling sedimentation room respectively;
Described steam accumulator is connected with described heat convection waste heat boiler with described heat accumulating type water-cooling sedimentation room, described steam accumulator collects the steam of described heat accumulating type water-cooling sedimentation room and the generation of described heat convection waste heat boiler, the saturated vapor of stable output after buffering;
Described heat convection waste heat boiler comprises high-temperature evaporator, superheater, middle cryogenic vaporizer, economizer and main drum, and described high-temperature evaporator, superheater, middle cryogenic vaporizer, economizer are connected to form an exhaust gases passes successively; Current through described oxygen-eliminating device deoxygenation enter in described main drum after described economizer, and described main drum and described high-temperature evaporator are all connected with middle cryogenic vaporizer and form the first steam/water circulating loop; Described main drum is also connected with described steam accumulator, and described superheater is connected with described steam accumulator, and described superheater changes into superheated steam for the saturated vapor heated from described steam accumulator and exports for user.
2. heat accumulating type electric boiler flue gas waste heat recovery system according to claim 1, it is characterized in that, also be provided with some shock-wave ash-clearing devices in described heat convection waste heat boiler, described some shock-wave ash-clearing devices are arranged between the set of heat exchange tubes of described high-temperature evaporator, superheater, middle cryogenic vaporizer, economizer.
3. heat accumulating type electric boiler flue gas waste heat recovery system according to claim 1, is characterized in that, described heat accumulating type water-cooling sedimentation room comprises:
Water-cooled flue, described electric furnace flue gas flows through described water-cooled flue and transfers heat to the sidewall of described water-cooled flue;
A group or more heat accumulating type trellis, is distributed in described water-cooled flue, and by spaced apart for described water-cooled flue, described flue gas flows through described heat accumulating type trellis;
Auxiliary drum, is connected with the sidewall of described water-cooled flue, is full of water and forms the second steam/water circulating loop between the two in the sidewall of described water-cooled flue and described auxiliary drum; Described auxiliary drum also connects described steam accumulator.
4. heat accumulating type electric boiler flue gas waste heat recovery system according to claim 3, is characterized in that, described water-cooled flue comprises:
Upper collecting chamber, is connected with described auxiliary drum;
Two groups of water cooled membrane wall, be symmetricly set on the both sides, front and back of described upper collecting chamber, the upper end of described two groups of water cooled membrane wall and described upper collecting chamber are connected to form the passage of a cross section in " Π " shape, described two groups of water cooled membrane wall lower ends are all connected with a lower header, and two described lower headers are all connected with described auxiliary drum;
Some ash buckets, are disposed side by side on the downside of described lower header, and the opening of described ash bucket is towards the bottom of described upper collecting chamber, and described some ash buckets and described upper collecting chamber and described two groups of water cooled membrane wall form a closed channel flowed through for described flue gas.
5. heat accumulating type electric boiler flue gas waste heat recovery system according to claim 4, is characterized in that, described water cooled membrane wall is made up of some steel pipes, and the upper end of described steel pipe is connected with described upper collecting chamber, and the lower end of described steel pipe is connected with described lower header.
6. heat accumulating type electric boiler flue gas waste heat recovery system according to claim 3, is characterized in that, the outside of described water-cooled flue is provided with heat-insulation layer.
7. heat accumulating type electric boiler flue gas waste heat recovery system according to claim 3, is characterized in that, often organizes described heat accumulating type trellis and is made up of some ceramic honeycomb bricks.
8. heat accumulating type electric boiler flue gas waste heat recovery system according to claim 1, is characterized in that, is also disposed with combustion settling chamber and is rectilinearly connected flue between described electric furnace with described heat accumulating type water-cooling sedimentation room.
9. heat accumulating type electric boiler flue gas waste heat recovery system according to claim 1, is characterized in that, the afterbody of described feed-water heater is also disposed with connected deduster, air exhauster and chimney.
10. heat accumulating type electric boiler flue gas waste heat recovery system according to claim 9, it is characterized in that, described heat accumulating type electric boiler flue gas waste heat recovery system also comprises petticoat pipe, and described petticoat pipe is positioned at the top of described electric furnace, and described petticoat pipe is also connected with described deduster.
11. heat accumulating type electric boiler flue gas waste heat recovery systems according to claim 1, it is characterized in that, the bottom of described heat accumulating type water-cooling sedimentation room, heat convection waste heat boiler and feed-water heater is provided with the some ash buckets for reclaiming dust, and described some ash buckets and described heat accumulating type water-cooling sedimentation room, heat convection waste heat boiler and feed-water heater form the closed channel flowed through for flue gas jointly.
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