CN207365730U - A kind of electric furnace residual neat recovering system - Google Patents
A kind of electric furnace residual neat recovering system Download PDFInfo
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- CN207365730U CN207365730U CN201721446540.8U CN201721446540U CN207365730U CN 207365730 U CN207365730 U CN 207365730U CN 201721446540 U CN201721446540 U CN 201721446540U CN 207365730 U CN207365730 U CN 207365730U
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Abstract
The utility model discloses a kind of electric furnace residual neat recovering system, belong to industrial furnace residual heat recycling field, which includes being sequentially connected electric furnace Vaporizing cooling bell, scrap preheater, Vaporizing cooling bend pipe flue, combustion settling chamber, smoke and waste steam boiler and the dusting smoke-discharging device of setting；Evaporator, economizer and soft water heater are equipped with smoke and waste steam boiler；Further include softened water tank, oxygen-eliminating device, middle pressure accumulation of heat station, low pressure accumulation of heat station, low-pressure drum and middle pressure drum.The utility model in setting by pressing drum to supply water for smoke and waste steam boiler evaporator, and low-pressure drum is electric furnace Vaporizing cooling bell, the water supply of Vaporizing cooling bend pipe flue, and recyclable furnace lid waste heat and a fume afterheat are to produce low-pressure steam and middle pressure steam；Also by setting economizer and soft water heater to improve the heat transfer temperature difference between flue gas and water in smoke and waste steam boiler, flue gas cool-down speed is improved, is conducive to suppress the synthesis of bioxin.
Description
Technical field
The utility model belongs to industrial furnace residual heat recovery technology field, and in particular to a kind of electric furnace residual neat recovering system.
Background technology
Substantial amounts of heat, including the heat dissipation of electric furnace body and fume afterheat of electric furnace will be produced during electric furnace smelting.Electricity
Stove bell is subject to the radiant heat of molten steel and electrode in stove, is mainly lost at present by way of recirculated water cooling.Cigarette of electric furnace
Gas waste heat is mainly recycled by way of preheating scrap or smoke and waste steam boiler.
103940248 B (application numbers of 104061793 B of patent CN (application number 201410181614.4) and CN
201410141897.X) individually disclose a kind of flue gas waste heat recovery system of electric furnace, in system disclosed in two patents
Equipped with economizer and soft water heater, to realize the cascade utilization of fume afterheat.But due to the periodicity of electric furnace smelting, system
Moisturizing also show periodic feature, when moisturizing is not required in drum or oxygen-eliminating device, there is economizer or soft water heater
The risk that dry combustion method and exhaust gas temperature can not be controlled effectively.
202470790 U of patent CN (application number 201220069391.9) disclose a kind of iron alloy electric furnace bell and cigarette
The system of road fume afterheat combined recovery, flue-pipe after-heat boiler share a set of feedwater deaeration device, bell with bell waste heat boiler
The steam that waste heat boiler produces is mixed with the steam that flue-pipe after-heat boiler produces, and is together fed in flue-pipe after-heat boiler overheat afterwards
Device realizes overheat, finally by steam turbine power generation.Bell waste heat boiler described in the patent and flue-pipe after-heat boiler pressure rating phase
Together.To improve afterheat steam quality, smoke and waste steam boiler generally uses medium-pressure boiler (2.5~3.9MPa, stove coolant-temperature gage at present>
200℃).Furnace lid can need according to technique in smelting process and be lifted, be rotated, the operation such as fascinate, and the confession of bell
Water return pipeline is generally connected using high-pressure hose or metal rotation connector.Higher operating pressure and temperature is easily led to for return pipe
Road booster or swivel joint leak, are unfavorable for the safe operation of system.
For scrap steel preheating type electric furnace, after smoke pre-heating steel scrap, the easy generation bioxin pollutant in its temperature-fall period.Electricity
The synthesis temperature window of kiln gas Zhong bioxin is 200~500 DEG C, wherein reaching maximum in 300 DEG C or so synthesis rates.To subtract
The generation of Shao bioxin, need to make flue gas quickly to skim over the temperature range in temperature-fall period.For smoke and waste steam boiler system,
To improve flue gas cool-down speed, the integrated heat transfer coefficient of heat exchanger in boiler on the one hand can be improved, such as patent CN 204100835U
(application number 201420602114.9) employs efficient heat-exchanging pipe structure and improves the coefficient of heat transfer, realizes flue gas chilling；On the other hand
The heat transfer temperature difference of fume side and water side, 104061793 B of patent CN (application number 201410181614.4) and CN can be improved
103940248 B (application number 201410141897.X) in smoke and waste steam boiler although used economizer and soft water to heat
Device, but due to only make use of fume afterheat of electric furnace, system water supplement amount is smaller, and the periodicity of electric furnace smelting causes province's coal in addition
Device and soft water heater insufficient water, heat exchange stability are poor.
Therefore, it is necessary to a kind of system that can recycle furnace lid and a fume afterheat at the same time, which need to improve electric furnace
Flue gas ensures the safety of system operation and reduces the synthesis of dioxin in flue gas, realize back in the rate of temperature fall of low-temperature space
Receive waste heat and reduce pollution of the flue gas to environment at the same time.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of electric furnace residual neat recovering system, for solving existing skill
The problems such as furnace lid waste heat recovery and boiler low-temperature area rate of temperature fall are poor compared with slow or heat exchange stability is not considered in art.
To reach above-mentioned purpose, the utility model is achieved through the following technical solutions：
The utility model provides a kind of electric furnace residual neat recovering system, including is sequentially connected the electric furnace Vaporizing cooling stove of setting
Lid, scrap preheater, Vaporizing cooling bend pipe flue, combustion settling chamber, smoke and waste steam boiler and dusting smoke-discharging device, the cigarette
In gas waste heat boiler evaporator, economizer and soft water heater have been sequentially arranged along flow of flue gas direction；Further include be connected to it is soft
The softened water tank of water heater inlet and outlet, be connected to economizer inlet and outlet and also removing with soft water heater outlet connection
Oxygen device, the middle pressure drum for being connected to evaporator with outlet and also being connected with economizer exit, be connected to electric furnace Vaporizing cooling
Bell and Vaporizing cooling bend pipe chimney intake and outlet and the also low-pressure drum with economizer exit connection, be connected with low-pressure drum
Low pressure accumulation of heat station and with the middle middle pressure accumulation of heat station that is connected of pressure drum.
Further, soft water heater outlet is connected by valve I, valve II respectively with softened water tank and oxygen-eliminating device, economizer
Outlet is connected by valve III, valve IV, valve V respectively with oxygen-eliminating device, middle pressure drum, low-pressure drum.
Further, softened water tank is connected to soft water heater import by softened water pump, and oxygen-eliminating device is connected to province by feed pump
Coal device import, low-pressure drum are connected to electric furnace Vaporizing cooling bell and Vaporizing cooling bend pipe flue by low pressure recycle pump.
Further, after oxygen-eliminating device is connected to low pressure accumulation of heat station by valve VI.
The beneficial effects of the utility model are：By setting low-pressure drum, ensure that high temperature section (including bell and vaporize it is cold
But bend pipe flue) heat pipe and the safe operation for backwater connecting pipe, low-pressure drum and HP steam drum share a set of deoxygenation and
Water replanishing device can reduce the investment of system, while improve the water supply of soft water heater and economizer.By setting low-pressure steam
Bag and middle pressure drum, realize the cascade utilization of energy, and middle pressure steam is for producing, low-pressure steam can be used for deoxygenation and full factory gives birth to
It is living.Economizer and soft water heater is set to realize making full use of for fume afterheat of electric furnace in smoke and waste steam boiler, and
And also improve the heat transfer temperature difference of fume side and water side and then improve flue gas cool-down speed, reduce the generation of bioxin.
Other advantages, target and feature of the utility model will be explained in the following description to a certain extent
State, and to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, or
Person can be instructed from the practice of the utility model.The target of the utility model and other advantages can be said by following
Bright book is realized and obtained.
Brief description of the drawings
In order to make the purpose of this utility model, technical solution and advantage clearer, below in conjunction with attached drawing to this practicality
It is new to be described in further detail, wherein：
Fig. 1 is electric furnace residual neat recovering system flow chart provided by the utility model.
Embodiment
Illustrate the embodiment of the utility model below by way of specific instantiation, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages and effect of the utility model easily.The utility model can also be by addition
Different embodiments are embodied or practiced, and the various details in this specification can also be based on different viewpoints with answering
With carrying out various modifications or alterations under the spirit without departing from the utility model.It should be noted that institute in following embodiments
The diagram of offer only illustrates the basic conception of the utility model in a schematic way, in the case where there is no conflict, following embodiments and
Feature in embodiment can be mutually combined.
Referring to Fig. 1, the element numbers in attached drawing are respectively：1- electric furnace Vaporizing coolings bell, 2- scrap preheaters, 3-
Vaporizing cooling bend pipe flue, 4- combustion settling chambers, 5- smoke and waste steam boilers, 5.1- evaporators, 5.2- economizers, 5.3- soft water add
Hot device, 6- dusting smoke-discharging devices, 7- softened water tanks, 8- softened water pumps, 9- feed pumps, 10- low pressure accumulation of heats station, 10.1- low pressure steam pipes
Pressed in net, 11- and drum, 14- low-pressure drums, 15- low pressure are pressed in accumulation of heat station, 11.1- middle pressure steams pipe network, 12- oxygen-eliminating devices, 13-
Circulating pump；A- valve Is, b- valves II, c- valves III, d- valves IV, e- valves V, f- valves VI.
The present embodiment is substantially as shown in Figure 1：A kind of electric furnace residual neat recovering system, for recycling furnace lid waste heat and one
Secondary fume afterheat is to produce low-pressure steam and middle pressure steam；Electric furnace Vaporizing cooling bell 1, steel scrap including being sequentially connected setting are pre-
Thermal 2, Vaporizing cooling bend pipe flue 3, combustion settling chamber 4, smoke and waste steam boiler 5 and dusting smoke-discharging device 6, the fume afterheat
In boiler evaporator 5.1, economizer 5.2 and soft water heater 5.3 have been sequentially arranged along flow of flue gas direction；Further include and be connected to
The softened water tank 7 of 5.3 inlet and outlet of soft water heater, be connected to 5.2 inlet and outlet of economizer and also with soft water heater 5.3
The oxygen-eliminating device 12 of connection is exported, is connected to 5.1 inlet and outlet of evaporator and also with the middle pressure drum of the outlet of economizer 5.2 connection
13rd, electric furnace Vaporizing cooling bell 1 and 3 inlet and outlet of Vaporizing cooling bend pipe flue are connected to and is also exported with economizer 5.2 and is connected
The low-pressure drum 14 connect, the low pressure accumulation of heat station 10 being connected with low-pressure drum 14 and the middle pressure accumulation of heat station being connected with middle pressure drum 13
11；The outlet of soft water heater 5.3 is connected by valve I a, II b of valve respectively with softened water tank 7 and oxygen-eliminating device 12, and economizer 5.2 goes out
Mouth is connected by III c of valve, IV d of valve, V e of valve respectively with oxygen-eliminating device 12, middle pressure drum 13, low-pressure drum 14；Softened water tank 7
5.3 import of soft water heater is connected to by softened water pump 8, oxygen-eliminating device 12 is connected to 5.2 import of economizer by feed pump 9, low
Pressure drum 14 is connected to electric furnace Vaporizing cooling bell 1 and Vaporizing cooling bend pipe flue 3 by low pressure recycle pump 15；Oxygen-eliminating device
After 12 are connected to low pressure accumulation of heat station 10 by VI f of valve.
Specifically, the cigarette wind waste heat recovery of the utility model is：Electric furnace Vaporizing cooling bell 1 (is not drawn by four hole bend pipes
Go out) it is connected with scrap preheater 2,1200~2000 DEG C of high-temperature flue gas passes through scrap steel preheating successively after the discharge of four hole of electric furnace
Progressively desuperheat is to less than 200 DEG C for device 2, Vaporizing cooling bend pipe flue 3, combustion settling chamber 4 and smoke and waste steam boiler 5, finally
Discharged after being sent into 6 dust separation of dusting smoke-discharging device；Carbonated drink waste heat recovery is：Soft water or demineralized water are from softened water tank 7 by softened water pump 8
The soft water heater 5.3 of 5 latter end of smoke and waste steam boiler is sent into pressurization, and soft water heater 5.3 exports connection 12 He of oxygen-eliminating device respectively
Softened water tank 7；Soft water is sent into the economizer 5.2 at the middle part of smoke and waste steam boiler 5, economizer after 12 deoxygenation of oxygen-eliminating device by feed pump 9
Drum 13, low-pressure drum 14 and oxygen-eliminating device 12 are pressed in connecting respectively in 5.2 outlets；The evaporator of middle pressure drum 13 and waste heat boiler 5
5.1 are connected, pot water evaporation endothermic in evaporator 5.1, and the steam of generation presses drum 13 to press accumulation of heat station 11 in being sent into by middle；Low pressure
Pot water in drum 14 is respectively fed to electric furnace Vaporizing cooling bell 1 and Vaporizing cooling bend pipe flue 3 by low pressure recycle pump 15, passes through
Low-pressure drum 14 is returned to after heat absorption vaporization, the steam of generation is sent into low pressure accumulation of heat station 10；Middle pressure accumulation of heat station 11 is exported steams with middle pressure
Steam pipe net 11.1 connects, the outlet of low pressure accumulation of heat station 10 connection oxygen-eliminating device 12 and low-pressure steam pipe network 10.1.
Using the above scheme, the utility model in setting by pressing drum to supply water for smoke and waste steam boiler evaporator, low pressure
Drum is electric furnace Vaporizing cooling bell, Vaporizing cooling bend pipe flue supplies water, recyclable furnace lid waste heat and a fume afterheat
To produce low-pressure steam and middle pressure steam；Also by setting economizer and soft water heater to improve cigarette in smoke and waste steam boiler
Heat transfer temperature difference between gas and water, improves flue gas cool-down speed, is conducive to suppress the synthesis of bioxin.
The operation principle of the electric furnace residual neat recovering system of lower the utility model is illustrated in detail below, including it is as follows：
S1：Utilize evaporator 5.1, the economizer 5.2 and soft being sequentially arranged along flow of flue gas direction in smoke and waste steam boiler 5
Water heater 5.3 improves the rate of temperature fall of flue gas, to reduce the residence time in flue gas bioxin synthesis reaction temperatures section；
I.e.：
The flue gas that electric furnace produces is discharged by four hole flues, successively by scrap preheater 2, Vaporizing cooling bend pipe
Flue 3 enters combustion settling chamber 4, and flue gas further can separate large dust particle at the same time by after-flame in combustion settling chamber.To reduce
The generation of flue gas dioxin, need to be by controlling steel loading amount in scrap preheater, scrap steel preheating time, to adjust burning sedimentation
The temperature of room exiting flue gas, is allowed to be not less than 900 DEG C, so as to ensure that bioxin is in complete thermal decomposition state in flue gas.It
Afterwards, flue gas enters smoke and waste steam boiler 5.Evaporator 5.1 is sequentially arranged along flow of flue gas direction, save coal in smoke and waste steam boiler 5
Device 5.2 and soft water heater 5.3.High-temperature flue gas first passes through evaporator 5.1, and the water temperature in evaporator 5.1 is 202~223 DEG C, cigarette
Temperature degree from>900 DEG C are cooled to 400~500 DEG C.Reach the reaction temperature window of bioxin synthesis at this time, flue gas enters afterwards
Economizer 5.2, is further cooled to 250~350 DEG C of fast reaction temperature ranges for reaching bioxin synthesis, and last flue gas enters
Soft water heater 5.3 is cooled to 170~250 DEG C.Due in economizer 5.2 average temperature it is lower than water temperature in evaporator 5.1~100
DEG C, average temperature in soft water heater 5.3 is lower than water temperature in economizer~and 100 DEG C, therefore can ensure to reduce in flue-gas temperature
Each section of heat exchanger still has higher heat transfer temperature difference afterwards, so as to can further improve the rate of temperature fall of flue gas, reduces flue gas two
The residence time in Evil English synthesis reaction temperatures section, reduces the growing amount of bioxin.Cigarette after the cooling of soft water heater 5.3
Pneumatic transmission, which enters after dusting smoke-discharging device 6 purifies, to be discharged.
S2：The soft water provided using softened water tank 7 is divided after soft water heater 5.3, oxygen-eliminating device 12, economizer 5.2 successively
Not Song Ru low-pressure drum 14 and middle pressure drum 13 it is low so that middle pressure drum 13 supplies water for the evaporator 5.1 of smoke and waste steam boiler 5
Pressure drum 14 is electric furnace Vaporizing cooling bell 1, Vaporizing cooling bend pipe flue 3 supplies water；I.e.：
Low temperature (~30 DEG C) soft water is sent into soft water heater 5.3 by softened water tank 7, by softened water pump 8 and is warming up to~80 DEG C, soft
Water heater 5.3 exports connects oxygen-eliminating device 12 and softened water tank 7 respectively, i.e., in the case where moisturizing is not required in oxygen-eliminating device 12, soft water exists
Circulated between softened water tank 7 and soft water heater 5.3, effectively prevent the 5.3 dry combustion method damage of boiler soft water heater or softened water pump
Frequent start-stop.Soft water is sent into economizer 5.2 after 12 deoxygenation of oxygen-eliminating device by feed pump 9, and economizer 5.2 exports presses in connection respectively
Drum 13, low-pressure drum 14 and oxygen-eliminating device 12, i.e., in the case where moisturizing is not required in middle pressure drum 13 or low-pressure drum 14, boiler
Feedwater circulates between oxygen-eliminating device 12 and economizer 5.2, effectively prevent the frequent of boiler economizer dry combustion method damage or feed pump
Start and stop.Middle pressure drum 13 is connected with evaporator 5.1, and low-pressure drum 14 passes through low pressure recycle pump 15 and electric furnace Vaporizing cooling bell 1
It is connected with Vaporizing cooling bend pipe flue 3.Due to electric furnace Vaporizing cooling bell 1,3 fume side of Vaporizing cooling bend pipe flue temperature compared with
Height, is equipped with low pressure recycle pump 15, recovery waste heat is more conducive to extension and changes by way of low force circulation using low-pressure drum 14
Heat pipe service life.
S3：Press the middle pressure steam that drum 13 produces to press accumulation of heat station 11 in being sent into utilization, be sent into after middle pressure steam voltage stabilizing
Middle pressure steam pipe network 11.1, for full factory's production and application；The low-pressure steam produced using low-pressure drum 14 is sent into low pressure accumulation of heat station
10, low-pressure steam pipe network 10.1 is sent into after low-pressure steam voltage stabilizing, lives and uses for full factory；I.e.：
The steam that middle pressure drum 13 and low-pressure drum 14 produce is respectively fed to middle pressure accumulation of heat station 11 and low pressure accumulation of heat station 10, steams
Vapour is stood firm by accumulation of heat after pressure, and middle pressure steam is sent into middle pressure steam pipe network 11.1, for full factory's production and application (as refining vacuumizes
Deng).Low-pressure steam is sent into oxygen-eliminating device 12 by VI f of valve first, is heated for moisturizing deoxygenation, remaining feeds low-pressure steam pipe network
10.1, live and use for full factory.
Generally speaking, the utility model is by setting low-pressure drum, ensures high temperature section (including bell and Vaporizing cooling bend pipe
Flue) heat pipe safe operation, low-pressure drum and HP steam drum share a set of deoxygenation and water replanishing device and can reduce the throwing of system
Money.By setting low-pressure drum and middle pressure drum, the cascade utilization of energy is realized, middle pressure steam is for producing, low-pressure steam
Live available for deoxygenation and full factory.Economizer and soft water heater is set to realize flue gas of electric furnace in smoke and waste steam boiler
Waste heat makes full use of, and also improves the heat transfer temperature difference of fume side and water side and then improve flue gas cool-down speed, reduces two
The generation of Evil English.
Finally illustrate, above example is merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng
The utility model is described in detail according to preferred embodiment, it will be understood by those of ordinary skill in the art that, can be to this
The technical solution technical scheme is modified or replaced equivalently of utility model, without departing from the objective and scope of the technical program, it should all
Cover among the right of the utility model.
Claims (4)
1. a kind of electric furnace residual neat recovering system, including it is sequentially connected electric furnace Vaporizing cooling bell (1), the scrap preheater of setting
(2), Vaporizing cooling bend pipe flue (3), combustion settling chamber (4), smoke and waste steam boiler (5) and dusting smoke-discharging device (6), its feature
It is, evaporator (5.1), economizer (5.2) and soft water has been sequentially arranged along flow of flue gas direction in the smoke and waste steam boiler
Heater (5.3)；Further include and be connected to the softened water tank (7) of soft water heater inlet and outlet, be connected to economizer import and go out
Mouth and the also oxygen-eliminating device (12) with soft water heater outlet connection, be connected to evaporator and outlet and also same economizer exit
The middle pressure drum (13) of connection, be connected to electric furnace Vaporizing cooling bell and Vaporizing cooling bend pipe chimney intake and outlet and also same province
Coal device exports the low-pressure drum (14) connected, the low pressure accumulation of heat station (10) being connected with low-pressure drum and presses what drum was connected with middle
Middle pressure accumulation of heat station (11).
2. electric furnace residual neat recovering system according to claim 1, it is characterised in that soft water heater export with softened water tank and
Oxygen-eliminating device is connected by valve I (a), valve II (b) respectively, and economizer exit is distinguished with oxygen-eliminating device, middle pressure drum, low-pressure drum
Connected by valve III (c), valve IV (d), valve V (e).
3. electric furnace residual neat recovering system according to claim 1, it is characterised in that softened water tank is connected by softened water pump (8)
In soft water heater import, oxygen-eliminating device is connected to economizer import by feed pump (9), and low-pressure drum is pumped by low pressure recycle
(15) electric furnace Vaporizing cooling bell and Vaporizing cooling bend pipe flue are connected to.
4. according to claim 1-3 any one of them electric furnace residual neat recovering systems, it is characterised in that oxygen-eliminating device passes through valve VI
(f) after being connected to low pressure accumulation of heat station.
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| CN201721446540.8U CN207365730U (en) | 2017-11-02 | 2017-11-02 | A kind of electric furnace residual neat recovering system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631640A (en) * | 2017-11-02 | 2018-01-26 | 中冶赛迪工程技术股份有限公司 | A kind of electric furnace residual neat recovering system and method |
| CN108645226A (en) * | 2018-05-24 | 2018-10-12 | 北京京诚科林环保科技有限公司 | A kind of electric furnace flue gas double-work medium heat exchange combined-circulation superheated steam system |
| CN109838776A (en) * | 2019-02-22 | 2019-06-04 | 东方菱日锅炉有限公司 | Steam-water circulation system for waste incineration and generating electricity |
| CN110686521A (en) * | 2019-11-20 | 2020-01-14 | 中冶南方工程技术有限公司 | Electric furnace flue gas waste heat utilization method and system |
-
2017
- 2017-11-02 CN CN201721446540.8U patent/CN207365730U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631640A (en) * | 2017-11-02 | 2018-01-26 | 中冶赛迪工程技术股份有限公司 | A kind of electric furnace residual neat recovering system and method |
| CN108645226A (en) * | 2018-05-24 | 2018-10-12 | 北京京诚科林环保科技有限公司 | A kind of electric furnace flue gas double-work medium heat exchange combined-circulation superheated steam system |
| CN108645226B (en) * | 2018-05-24 | 2023-12-29 | 北京京诚科林环保科技有限公司 | Electric stove flue gas double working medium heat exchange composite cycle superheated steam system |
| CN109838776A (en) * | 2019-02-22 | 2019-06-04 | 东方菱日锅炉有限公司 | Steam-water circulation system for waste incineration and generating electricity |
| CN110686521A (en) * | 2019-11-20 | 2020-01-14 | 中冶南方工程技术有限公司 | Electric furnace flue gas waste heat utilization method and system |
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