CN115654951A - Heat accumulating type electric furnace flue gas waste heat recycling system - Google Patents
Heat accumulating type electric furnace flue gas waste heat recycling system Download PDFInfo
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- CN115654951A CN115654951A CN202211678656.XA CN202211678656A CN115654951A CN 115654951 A CN115654951 A CN 115654951A CN 202211678656 A CN202211678656 A CN 202211678656A CN 115654951 A CN115654951 A CN 115654951A
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Abstract
The invention discloses a heat accumulating type electric furnace flue gas waste heat recycling system which comprises a heat insulating flue connected with an electric furnace, a waste steel preheating chamber connected with the heat insulating flue, a settling chamber, a high-temperature dust remover, a heat accumulator, a primary superheater, a secondary superheater, a flue type waste heat boiler, an economizer, a condensate water preheater, a flue gas purification device, an overheated steam user, a condenser, a deaerator, a boiler barrel and a biomass afterburning furnace, wherein the heat insulating flue, the waste steel preheating chamber, the settling chamber, the high-temperature dust remover, the heat accumulator, the primary superheater, the flue type waste heat boiler, the economizer, the condensate water preheater and the flue gas purification device are sequentially connected through a flue gas pipeline. This heat accumulation formula electric stove flue gas waste heat recovery utilizes system not only can reduce the energy consumption, improves generator generating efficiency, can be simultaneously according to the accurate control secondary afterburning heat of the superheated steam condition, and calorific loss is little, and the flue gas total emission is little.
Description
Technical Field
The invention relates to the technical field of industrial electric arc furnace flue gas treatment, in particular to a heat accumulating type electric furnace flue gas waste heat recycling system.
Background
At present, the main technical route of short-flow steelmaking in China is an electric furnace smelting, scrap steel preheating and electric furnace flue gas waste heat power generation process, but the flue gas generated by electric furnace smelting has the following characteristics due to discontinuity and instability of the electric furnace production process: 1) The generation of the flue gas of the electric furnace is intermittent, and the parameters of the flue gas of the electric furnace have the characteristic of complex wave mobility; in the smelting process of the electric arc furnace, along with the steel making and tapping joint and the change of smelting strength, the flue gas flow, temperature, components and dust content are constantly changed, and the electric arc furnace presents periodic complex fluctuation characteristics, wherein the flue gas temperature in an oxidation period is the highest, the flue gas flow is the largest, the dust content is the largest, the flue gas temperature in a tapping period is the lowest, the flow is the smallest and the dust content is the smallest; 2) The smoke has high dust concentration and small particle size, and the smoke content is generally 8-15g/m 3 The maximum value is 30 g/m 3 The particle size is generally distributed in the range of 0-30 mu m, the adsorption force is larger, in addition, the Zn content in the dust is higher, so that the dust has certain viscosity, and the dust cleaning on the heating surface is more difficult; 3) The temperature fluctuation of the flue gas is large. The electric arc formal smelting is carried out for about 40min, the temperature of the flue gas at the outlet of the converter fluctuates between 400 ℃ and 1400 ℃, and the instantaneous temperature can reach about 1800 ℃ at most. For the electric furnace with scrap steel preheating, the outlet temperature of the scrap steel preheating system fluctuates between 250 ℃ and 850 ℃. The electric furnace flue gas waste heat power generation is an important technical means for recovering electric furnace flue gas waste heat, reducing electric furnace ton steel power consumption and reducing ton steel carbon dioxide emission, and the existing waste steel waste heat power generation system generally comprises two types: the electric furnace flue gas waste heat saturated steam power generation technology and the electric furnace flue gas waste heat conventional combustion afterburning superheated steam power generation technology. Wherein the conventional burning after-combustion superheated steam power generation technology of electric stove flue gas waste heat is because generating efficiency is higher than the electric stove waste heat saturated steam power generation technology, so, more and more enterprises adopt the conventional burning after-combustion superheated steam power generation technology of electric stove flue gas waste heat, but the conventional burning after-combustion superheated steam power generation technology of electric stove flue gas waste heat has following problem again: firstly, the conventional afterburning technology is used for supplementing heat to all electric furnace flue gas, the fuel consumption is large, the supplemented heat is rarely used for steam overheating, most of the supplemented heat is used for heating a low-parameter working medium on a rear convection heating surface, the utilization efficiency of the afterburning heat is very low, and the afterburning heat is economicalVery poor in performance; secondly, the after-burning furnace takes fossil fuel as a heat source, and the emission of greenhouse gases is large; thirdly, the afterburning furnace adopts the conventional combustion technology, so that the emission of nitrogen oxides is large; fourthly, the total emission of the smoke is large, which further causes the emission of greenhouse gases to be large; fifthly, after-burning of the steam overheating after-burning furnace is not accurate, the thermal efficiency of the after-burning furnace is low, and carbon dioxide emission per ton steel is large; and sixthly, the power generation efficiency of the generator is low due to the fluctuation of the boiler flue gas.
If the notice number is: the electric furnace flue gas waste heat utilization system disclosed in CN211012515U is characterized in that a primary combustion section and a secondary afterburning section connected to the bottom of the primary combustion section are arranged in a combustion chamber, a primary combustion structure is correspondingly arranged on the primary combustion section, and a secondary afterburning structure is arranged on the secondary afterburning section, so that electric furnace flue gas is combusted secondarily, and the adjustable flue gas temperature and steam overheating of an inlet of a waste heat boiler are realized, but the serial afterburning structure of the co-combustion chamber ensures that the heat control of a steam overheating notch is not accurate, so that the heat loss is large, and the heat efficiency is low; meanwhile, the flue gas after heat exchange cannot be reused, so that the overall emission of the flue gas is large, and the emission of greenhouse gases is large; in addition, the dust adhesion effect of the primary combustion section and the secondary afterburning section is serious, and the ash removal is difficult; besides, the patent adopts the conventional combustion technology, and the problem of large emission of nitrogen oxides also exists.
Disclosure of Invention
The invention aims to provide a heat accumulating type electric furnace flue gas waste heat recycling system which can reduce energy consumption and improve the power generation efficiency of a generator, can accurately control secondary afterburning heat according to the condition of primary superheated steam, and has the advantages of small heat loss, high heat efficiency, small total flue gas emission, small greenhouse gas emission, small nitrogen oxide emission and small adhesion effect of a heated pipeline.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heat accumulating type electric furnace flue gas waste heat recycling system comprises a heat insulation flue connected with an electric furnace, a waste steel preheating chamber connected with the heat insulation flue, a settling chamber, a high-temperature dust remover, a heat accumulator, a primary superheater, a secondary superheater, a flue type waste heat boiler, an economizer, a condensate water preheater, a flue gas purification device, an overheated steam user, a condenser, a deaerator, a boiler barrel and a biomass afterburning furnace, wherein the heat insulation flue, the waste steel preheating chamber, the settling chamber, the high-temperature dust remover, the heat accumulator, the primary superheater, the flue type waste heat boiler, the economizer, the condensate water preheater and the flue gas purification device are sequentially connected through a flue gas pipeline; flue gas discharged by the electric furnace enters the settling chamber for coarse dust removal after heat exchange through the heat-insulating flue and the waste steel preheating chamber in sequence, and then is further dedusted by the high-temperature deduster, and the dedusted flue gas is further subjected to heat exchange through the heat accumulator, the primary superheater, the flue-type waste heat boiler, the economizer and the condensate water preheater in sequence and then is purified by the flue gas purification device; the system comprises a condenser, a deaerator, a coal economizer, a descending pipe, an ascending pipe, a primary superheater, a secondary superheater, a superheated steam user, a deaerator and a steam-water separator, wherein the superheated steam user is connected with the condenser, exhaust steam generated by the superheated steam user is condensed by the condenser to form condensate water, the condenser is connected with a condensate water preheater, the condensate water preheater is connected with the deaerator, the condensate water formed by condensation of the condenser enters the deaerator for deoxidization after heat exchange of the condensate water preheater, the deaerator is further connected with the coal economizer, the coal economizer is further connected with a boiler barrel, the descending pipe of the boiler barrel is connected with a flue type waste heat boiler, the ascending pipe is sequentially connected with the primary superheater and the secondary superheater through heat exchange pipelines, and the secondary superheater is connected with the superheated steam user; the biomass after-burning furnace is respectively connected with the induced air pipe and the secondary superheater, the induced air pipe is provided with a first induced draft fan, the first induced draft fan can introduce external air into the biomass after-burning furnace, smoke generated by the biomass after-burning furnace flows into the secondary superheater, and the smoke flowing out of the secondary superheater is discharged into the heat accumulator for heat exchange through the first smoke discharge pipeline.
Preferably, the system also comprises a first return pipeline, wherein one part of the flue gas subjected to heat exchange by the economizer is discharged into a condensate water preheater through a second smoke discharge pipeline, and the other part of the flue gas flows into the induced draft pipe through the first return pipeline and is converged with the air in the induced draft pipe.
Preferably, the heat storage device further comprises a second backflow pipeline, a part of the flue gas subjected to heat exchange by the economizer is discharged into a condensate water preheater through the second smoke discharge pipeline, a part of the flue gas flows into the induced draft pipe through the first backflow pipeline and is converged with air in the induced draft pipe, a part of the flue gas flows into the heat storage body through the second backflow pipeline, and the heat storage body is a honeycomb ceramic heat storage body.
Preferably, the flue gas purification device comprises an activated carbon adsorption tower connected with the condensate water preheater and a bag-type dust collector connected with the activated carbon adsorption tower, the bag-type dust collector is connected with a chimney through a third smoke exhaust pipeline, and the superheated steam user comprises a steam turbine and a generator.
Further preferably, a first regulating valve is arranged on the first backflow pipeline, a second regulating valve is arranged on the second backflow pipeline, and a third draught fan is arranged on the third smoke exhaust pipeline.
According to the technical scheme, high-temperature flue gas generated by the electric furnace is preheated by the scrap steel preheating chamber, then is introduced into the settling chamber to carry out coarse dust removal on the flue gas, and then is introduced into the high-temperature dust remover to further remove dust from the flue gas, so that the problem that the dust adhesion effect of a primary superheater and a subsequent flue type waste heat boiler is serious, the dust removal is difficult, and meanwhile, the blockage of a heat accumulator is effectively avoided. The flue gas after dust removal carries out peak shifting and valley filling on the temperature of the flue gas by utilizing the heat accumulator, so that the fluctuation range of the temperature of the flue gas before entering the primary superheater is greatly reduced, and the temperature of the flue gas is basically stabilized between 450 ℃ and 550 ℃. The method comprises the following steps that (1) saturated steam forms superheated steam in a primary superheater by utilizing the self heat of electric furnace flue gas, a biomass afterburning mode is utilized to accurately provide a heat gap for the superheated steam, and when the primary superheater is enough to ensure the superheat degree of the steam, a secondary superheater basically does not provide heat or only provides little heat for the superheated steam; when the primary superheater can not guarantee the degree of superheat of steam due to fluctuation of flue gas, the secondary superheater can guarantee the stability of the degree of superheat of steam by providing a heat notch for superheated steam accurately, so that the safety of a steam turbine and the continuous power generation of a generator are guaranteed, and the power generation efficiency of the generator is improved. The flue gas that the living beings after-combustion generated flows into the second grade superheater heat transfer back and discharges into the heat accumulator heat transfer through first exhaust pipe way again, and the flue gas flow of further guaranteeing to flow through the heat accumulator is simultaneously carried out to this part of flue gas heat, reduces flue gas valley temperature, flue gas volume fluctuation, and the loss of heat is little in the living beings after-combustion, and the thermal efficiency is high. The flue gas after heat exchange of the economizer has sensible heat of about 200 ℃ and contains about 10% of oxygen for combustion supporting, so that part of the flue gas is discharged into a condensate water preheater through a second smoke discharge pipeline, part of the flue gas flows into an induced draft pipe through a first return pipeline and is converged with air in the induced draft pipe to form oxygen-deficient air suitable for combustion supporting to participate in biomass afterburning, and part of the flue gas flows into a heat accumulator again through a second return pipeline to further ensure the flow of the flue gas flowing through the heat accumulator, reduce the fluctuation of the low-valley flue gas volume of the flue gas, further utilize the waste heat of the flue gas, reduce the total emission of the flue gas and reduce the emission of greenhouse gas.
Drawings
Fig. 1 is a schematic diagram of the heat accumulating type electric furnace flue gas waste heat recycling system.
Detailed Description
The invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the heat accumulating type electric furnace flue gas waste heat recycling system includes a heat-insulating flue 1, a waste steel preheating chamber 2, a settling chamber 3, a high-temperature dust remover 4, a heat accumulator 5, a primary superheater 6, a secondary superheater 7, a flue-type waste heat boiler 8, an economizer 9, a condensate water preheater 10, a flue gas purification device 11, an superheated steam user 12, a condenser 13, a deaerator 14, a boiler barrel 15 and a biomass afterburning furnace 16, wherein the heat-insulating flue 1 is connected with an external full waste steel type electric furnace 100, the full waste steel type electric furnace 100 does not substantially generate carbon monoxide in a smelting process, the heat-insulating flue 1 can be a flue lined with refractory castable, and the settling chamber is a simplest dust removal device for naturally settling dust under the action of gravity in the prior art, and is not described herein. The heat preservation flue 1, the scrap steel preheating chamber 2, the settling chamber 3, the high-temperature dust collector 4, the heat accumulator 5, the primary superheater 6, the flue type waste heat boiler 8, the economizer 9, the condensate water preheater 10 and the flue gas purification device 11 are sequentially connected through a flue gas pipeline, so that high-temperature flue gas generated by the full scrap steel smelting electric furnace is subjected to heat exchange through the heat preservation flue 1 and the scrap steel preheating chamber 2, is firstly introduced into the settling chamber 3 to carry out coarse dust removal on the flue gas, and is then further subjected to dust removal through the high-temperature dust collector 4, the phenomenon that the dust adhesion effect of the primary superheater 6 and the subsequent flue type waste heat boiler 7 is serious is avoided, the dust removal difficulty is caused, and the blockage of the heat accumulator 5 is prevented. The dedusted flue gas is further subjected to heat exchange through a heat accumulator 5, a primary superheater 6, a flue type waste heat boiler 8, an economizer 9 and a condensate water preheater 10 in sequence, and then is purified through a flue gas purification device 11. The heat accumulator 5 is a honeycomb ceramic heat accumulator, the heat accumulator exchanges heat with flue gas when the flue gas after dust removal flows through the heat accumulator, and when the temperature of the flue gas is higher, the flue gas stores part of heat in the heat accumulator so as to reduce the temperature of the flue gas; when the temperature of the flue gas is lower, the heat accumulator releases heat to the flue gas to increase the temperature of the flue gas, and peak shifting and valley filling of the heat accumulator to the temperature of the flue gas are realized, so that the fluctuation range of the temperature of the flue gas before entering the primary superheater is greatly reduced, and the temperature of the flue gas is basically stabilized between 450 ℃ and 550 ℃. The flue gas purification device 11 comprises an activated carbon adsorption tower 111 connected with the condensate water preheater 10 and a bag-type dust collector 112 connected with the activated carbon adsorption tower 111, wherein the activated carbon adsorption tower 111 can effectively adsorb dioxin-like substances in flue gas, the bag-type dust collector can further purify and remove dust from the flue gas, the purified flue gas is connected with a chimney 17 through a third smoke exhaust pipeline 171, the flue gas is exhausted into the atmosphere through the chimney 17, a third induced draft fan 172 is arranged on the third smoke exhaust pipeline 171, and the heat exchange circulation speed of the flue gas is accelerated. A dioxin substance detection device can be arranged at the inlet end of the activated carbon adsorption tower 111, and the content of dioxin substances in flue gas detected by the dioxin substance detection device guides the carbon spraying amount in the activated carbon adsorption tower, so that the removal effect of the dioxin substances is ensured.
The superheated steam user 12 is connected with the condenser 13, the superheated steam user 12 comprises a steam turbine 121 and a generator 122, the steam turbine 121 drives the generator 122 to generate electricity to generate exhaust steam, the exhaust steam is condensed by the condenser 13 to form condensate water, the condenser 13 is connected with the condensate water preheater 10, the condensate water preheater 10 is connected with the deaerator 14, thus, condensed water formed by condensation of the condenser 13 is subjected to heat exchange with flue gas passing through the condensed water preheater 10 and temperature rise, and then enters the deaerator 14 to be deaerated to generate deaerated water, an air source of the deaerator is from a steam turbine for steam extraction, the deaerated water is pressurized by the water feed pump 141 and then enters the economizer 9 connected with the deaerator 14, so that the deaerated water can be further subjected to heat exchange with the flue gas in the economizer 9, low-temperature flue gas waste heat of the economizer 9 is utilized to provide preheating for the deaerated water to form saturated water, the saturated water leaving the economizer 9 then enters the boiler barrel 15 connected with the economizer 9, a downcomer 151 of the boiler barrel is connected with the flue type waste heat boiler 8, saturated water and smoke in a heating surface pipe of the flue type waste heat boiler 8 exchange heat to absorb latent heat of vaporization to form a steam-water mixture, the steam-water mixture then returns to the drum 15 to be subjected to steam-water separation, the saturated water after the steam-water separation circularly enters the flue type waste heat boiler 8 to be vaporized, the saturated steam after the steam-water separation is sequentially connected with a primary superheater 6 and a secondary superheater 7 through a rising pipe 152 of the drum by a heat exchange pipeline, the secondary superheater 7 is connected with a superheated steam user 12, therefore, the steam-water separated saturated steam firstly enters the first-stage superheater 6 through the ascending pipe 152 of the drum through the heat exchange pipeline to absorb the high-temperature waste heat of the electric furnace flue gas again to form superheated steam, then the superheated steam is ensured to be superheated through the second-stage superheater, and then the superheated steam enters the steam turbine to drive the generator 122 to generate power. The dead steam after doing work is condensed by the condenser 13 to form condensed water, and the condensed water enters the condensed water preheater to circulate the process. In this embodiment, the biomass after-combustion furnace 16 is respectively connected with the induced air duct 161 and the secondary superheater 7, the induced air duct 161 is provided with a first induced draft fan 162, the first induced draft fan 162 introduces external air into the biomass after-combustion furnace 16, flue gas generated by the biomass after-combustion furnace 16 flows into the secondary superheater 7 for heat exchange, a biomass after-combustion mode is used for accurately providing a heat gap for superheated steam, and when the primary superheater 6 is enough to ensure the degree of superheat of steam, the secondary superheater 7 basically does not provide heat or only provides little heat for the superheated steam; when the primary superheater 6 can not guarantee the degree of superheat of steam due to fluctuation of flue gas, the secondary superheater 7 guarantees that the degree of superheat of steam is stable to the accurate heat supply breach of superheated steam, guarantees that the steam turbine safety and the generator continuously generate electricity, thereby improving the generating efficiency of the generator. And the flue gas that flows out by the heat transfer of second grade over heater 7 discharges into heat accumulator 5 heat transfer through first exhaust pipe 163, and this part of flue gas heat further guarantees the flue gas flow who flows through heat accumulator 5 simultaneously, and temperature and flue gas volume when further reducing the flue gas low ebb fluctuate, and the biomass afterburning calorific loss is little, and the thermal efficiency is high, and more conventional fossil fuel, greenhouse gas emission is littleer. In a preferred embodiment, the system for recycling the flue gas waste heat of the heat accumulating type electric furnace further comprises a first return pipeline 164 and a second return pipeline 165, the flue gas after heat exchange by the economizer 9 has sensible heat of about 200 ℃ and contains about 10% of oxygen for supporting combustion, so that a part of the flue gas is discharged into a condensed water preheater through a second exhaust pipeline 166, a part of the flue gas flows into the air guiding pipe 161 through the first return pipeline 164 and is converged with air in the air guiding pipe 161 to form oxygen-deficient air suitable for supporting combustion to participate in biomass afterburning, and a part of the flue gas flows into the heat accumulator 5 again through the second return pipeline 165 to further ensure the flow rate of the flue gas flowing through the heat accumulator 5, thereby further realizing the utilization of the flue gas waste heat and simultaneously reducing the total emission of the flue gas. A fourth induced draft fan 167 may be further disposed on the first return pipeline 164 and the second return pipeline 165, so that the flue gas may be introduced to the first return pipeline 164 and the second return pipeline 165 more smoothly. A first regulating valve 1641 is arranged on the first return pipeline, and a second regulating valve 1651 is arranged on the second return pipeline. The mixing ratio of the part of the flue gas and the outside air is adjusted by controlling the first adjusting valve 1641.
In the technical scheme, the flue gas flow of the electric furnace is as follows: high-temperature flue gas generated by the electric furnace is subjected to heat exchange through a heat-insulating flue 1 and a scrap steel preheating chamber 2, then is introduced into a settling chamber 3 for coarse dust removal, and is further subjected to dust removal through a high-temperature dust remover 4, the dedusted flue gas flows through a heat accumulator to exchange heat with the flue gas, and when the temperature of the flue gas is higher, the flue gas stores a part of heat in the heat accumulator, so that the temperature of the flue gas is reduced; when the temperature of the flue gas is lower, the heat accumulator releases heat to the flue gas to raise the temperature of the flue gas, and peak shifting and valley filling of the heat accumulator to the temperature of the flue gas are realized, so that the fluctuation range of the temperature of the flue gas before entering the primary superheater is greatly reduced, and the temperature of the flue gas is basically stabilized between 450 ℃ and 550 ℃. Then, after heat exchange of the flue gas sequentially through the primary superheater 6, the flue-type waste heat boiler 8 and the economizer 9, a part of the flue gas is discharged into the condensate water preheater through the second exhaust duct 166, a part of the flue gas flows into the induced draft pipe 161 through the first return duct 164 and joins with air in the induced draft pipe 161 to form oxygen-deficient air suitable for combustion supporting to participate in biomass afterburning, and a part of the flue gas flows into the heat accumulator 5 again through the second return duct 165 to further ensure the flow rate of the flue gas flowing through the heat accumulator 5, so that the low valley temperature and the fluctuation of the flue gas amount are reduced, and the total emission of the flue gas is reduced while the further utilization of the flue gas waste heat is realized.
The working medium flow is as follows: condensed water formed by condensation of a condenser 13 is subjected to heat exchange with flue gas passing through the condensed water preheater 10 and temperature rise, then enters a deaerator 14 to be deaerated to generate deaerated water, the deaerated water is pressurized by a water feed pump 141 and then enters an economizer 9, the deaerated water can further exchange heat with the flue gas in the economizer 9, low-temperature flue gas waste heat of the economizer 9 is utilized to provide preheating for the deaerated water to form saturated water, the saturated water leaving the economizer 9 then enters a boiler barrel 15, the saturated water in the boiler barrel 15 enters a flue type waste heat boiler, the saturated water and the flue gas in a heating surface pipe of the flue type waste heat boiler 8 exchange heat to absorb latent heat of vaporization to form a steam-water mixture, the steam-water mixture then returns to the boiler barrel 15 to be subjected to steam-water separation, the saturated water after the steam-water separation circularly enters the flue type waste heat boiler to be vaporized, and the saturated steam after the steam-water separation enters a primary superheater to absorb the high-temperature waste heat of the flue gas again to form superheated steam. When the primary superheater 6 is sufficient to ensure the superheat degree of the steam, the secondary superheater 7 basically does not provide heat or only provides little heat to the superheated steam; when the primary superheater 6 can not guarantee the degree of superheat of steam due to fluctuation of flue gas, the secondary superheater 7 guarantees that the degree of superheat of steam is stable to the accurate heat supply breach of superheated steam, guarantees that the steam turbine safety and the generator continuously generate electricity, thereby improving the generating efficiency of the generator. By utilizing the scheme, the supplementary fuel gas consumption can be greatly reduced, the reduction rate of the supplementary fuel gas consumption can reach 30-60%, the emission reduction of the total amount of flue gas can be reduced by about 10%, the emission reduction of carbon dioxide can be greatly reduced, the power generation efficiency of the generator is improved to 25% from the original 15%, and the power generation efficiency of the generator is obviously improved.
The embodiment is only for explaining the conception and the implementation of the invention, and does not limit the same, and the technical solution without substantial change is still in the protection scope under the conception of the invention.
Claims (5)
1. A heat accumulating type electric furnace flue gas waste heat recycling system comprises a heat insulating flue connected with an electric furnace and a waste steel preheating chamber connected with the heat insulating flue, and is characterized by further comprising a settling chamber, a high-temperature dust remover, a heat accumulator, a primary superheater, a secondary superheater, a flue type waste heat boiler, an economizer, a condensate water preheater, a flue gas purification device, an overheated steam user, a condenser, a deaerator, a boiler barrel and a biomass afterburning furnace, wherein the heat insulating flue, the waste steel preheating chamber, the settling chamber, the high-temperature dust remover, the heat accumulator, the primary superheater, the flue type waste heat boiler, the economizer, the condensate water preheater and the flue gas purification device are sequentially connected through a flue gas pipeline; flue gas discharged by the electric furnace enters the settling chamber for coarse dust removal after heat exchange through the heat-insulating flue and the waste steel preheating chamber in sequence, and then is further dedusted by the high-temperature deduster, and the dedusted flue gas is further subjected to heat exchange through the heat accumulator, the primary superheater, the flue-type waste heat boiler, the economizer and the condensate water preheater in sequence and then is purified by the flue gas purification device; the system comprises a condenser, a deaerator, a coal economizer, a descending pipe, an ascending pipe, a primary superheater, a secondary superheater, a superheated steam user, a deaerator and a steam-water separator, wherein the superheated steam user is connected with the condenser, exhaust steam generated by the superheated steam user is condensed by the condenser to form condensate water, the condenser is connected with a condensate water preheater, the condensate water preheater is connected with the deaerator, the condensate water formed by condensation of the condenser enters the deaerator for deoxidization after heat exchange of the condensate water preheater, the deaerator is further connected with the coal economizer, the coal economizer is further connected with a boiler barrel, the descending pipe of the boiler barrel is connected with a flue type waste heat boiler, the ascending pipe is sequentially connected with the primary superheater and the secondary superheater through heat exchange pipelines, and the secondary superheater is connected with the superheated steam user; the biomass afterburning furnace is respectively connected with the induced duct and the secondary superheater, the induced duct is provided with a first draught fan, the first draught fan can introduce external air into the biomass afterburning furnace, smoke generated by the biomass afterburning furnace flows into the secondary superheater, and the smoke flowing out of the secondary superheater is discharged into the heat accumulator for heat exchange through the first smoke exhaust pipeline.
2. The system of claim 1, further comprising a first return pipe, wherein a part of the flue gas after heat exchange by the economizer is discharged into a condensate preheater through a second exhaust pipe, and a part of the flue gas flows into the induced draft pipe through the first return pipe and joins with air in the induced draft pipe.
3. The system of claim 2, further comprising a second return pipe, wherein a part of the flue gas after heat exchange by the economizer is discharged into a condensate preheater through a second exhaust pipe, a part of the flue gas flows into the induced draft pipe through the first return pipe and joins with air in the induced draft pipe, and a part of the flue gas flows into the heat accumulator through the second return pipe, wherein the heat accumulator is a honeycomb ceramic heat accumulator.
4. The heat accumulating type electric furnace flue gas waste heat recycling system as claimed in claim 3, wherein the flue gas purifying device comprises an activated carbon adsorption tower connected with a condensate water preheater and a bag-type dust collector connected with the activated carbon adsorption tower, the bag-type dust collector is connected with a chimney through a third smoke exhaust pipeline, and the superheated steam user comprises a steam turbine and a generator.
5. The heat accumulating type electric furnace flue gas waste heat recycling system of claim 4, wherein a first regulating valve is arranged on the first return pipeline, a second regulating valve is arranged on the second return pipeline, and a third induced draft fan is arranged on the third exhaust pipeline.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003329201A (en) * | 2002-05-07 | 2003-11-19 | Babcock Hitachi Kk | Exhaust heat recovery boiler, combined power generation method and device |
| CN101071043A (en) * | 2007-05-09 | 2007-11-14 | 昆明阳光数字技术股份有限公司 | Low-temperature residual heat power generating system for steel smelting sintering ring-cooling machine |
| CN103940248A (en) * | 2014-04-10 | 2014-07-23 | 上海宝钢节能环保技术有限公司 | Heat accumulation type electric furnace flue gas waste heat recovery system |
| CN204987895U (en) * | 2015-05-13 | 2016-01-20 | 湖南中冶长天节能环保技术有限公司 | Take sintering waste heat power generation facility of external overheated after burning |
| 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 |
-
2022
- 2022-12-27 CN CN202211678656.XA patent/CN115654951B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003329201A (en) * | 2002-05-07 | 2003-11-19 | Babcock Hitachi Kk | Exhaust heat recovery boiler, combined power generation method and device |
| CN101071043A (en) * | 2007-05-09 | 2007-11-14 | 昆明阳光数字技术股份有限公司 | Low-temperature residual heat power generating system for steel smelting sintering ring-cooling machine |
| CN103940248A (en) * | 2014-04-10 | 2014-07-23 | 上海宝钢节能环保技术有限公司 | Heat accumulation type electric furnace flue gas waste heat recovery system |
| CN204987895U (en) * | 2015-05-13 | 2016-01-20 | 湖南中冶长天节能环保技术有限公司 | Take sintering waste heat power generation facility of external overheated after burning |
| 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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