CN115654950A - Biomass afterburning type electric furnace flue gas waste heat recycling system - Google Patents
Biomass afterburning type electric furnace flue gas waste heat recycling system Download PDFInfo
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Abstract
The invention discloses a biomass afterburning type electric furnace flue gas waste heat recycling system which comprises a heat-insulating flue connected with an electric furnace, and further comprises a settling chamber, a primary superheater, a secondary superheater, a flue type waste heat boiler, an economizer, a condensate water preheater, a flue gas purification device, a superheated steam user, a condenser, a deaerator, a heat accumulator, a boiler barrel and a biomass afterburning furnace, wherein the settling chamber, 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; the heat preservation flue is connected with an inlet of the settling chamber, and an outlet of the settling chamber is connected with a flue gas inlet of the primary superheater. The biomass after-burning electric furnace flue gas waste heat recycling system can accurately control secondary after-burning heat according to the condition of primary superheated steam, and has small heat loss and high heat efficiency; the flue gas after heat exchange can be reused, the total emission of the flue gas is small, the emission of greenhouse gases is small, and the emission of nitrogen oxides is small.
Description
Technical Field
The invention relates to the technical field of industrial electric arc furnace flue gas treatment, in particular to a biomass afterburning type electric furnace flue gas waste heat recycling system.
Background
Short-flow steelmaking is a major industry adjustment direction for realizing the strategic target of carbon neutralization in the steel industry in China, the current mainstream technical route of short-flow steelmaking in China is the processes of electric furnace smelting, scrap steel preheating and electric furnace flue gas waste heat power generation, but the flue gas generated by electric furnace smelting has the following characteristics due to discontinuity and instability in the production process of the electric furnace: 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; 2) The smoke has high dust concentration and small particle size, and the smoke content is generally 8-15g/m 3 At most 30 g/m 3 The particle size is generally distributed in the range of 0-30 μm, the adsorption force is large, and in addition, the content of Zn in the dust is high, so that the dust has certain viscosity, and the dust removal on a heating surface is 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 a 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 electric furnace flue gas waste heat conventional combustion after-burning superheated steam power generation technology has higher power generation efficiency than the electric furnace flue gas waste heat saturated steam power generation technology, so more and more enterprises adopt the electric furnace flue gas waste heat conventional combustion after-burning superheated steam power generation technologyThe power generation technology of the superheated steam by burning and afterburning, but the power generation technology of the superheated steam by burning and afterburning by the waste heat of the flue gas of the electric furnace conventionally has the following problems: firstly, the exhaust gas temperature of the steam overheating after-burning furnace is higher, generally higher than 350 ℃, so that the thermal efficiency of the after-burning furnace is lower, and the carbon dioxide emission per ton steel is larger; secondly, the after-burning furnace takes fossil fuel as a heat source, and the emission of greenhouse gas is large; thirdly, the afterburning furnace adopts the conventional combustion technology, so that the discharge amount of nitrogen oxides is large; fourthly, the total emission of the smoke is large, and further the emission of greenhouse gases is large; fifthly, the post combustion of the steam overheating post combustion furnace is not accurate, the thermal efficiency of the post combustion furnace is low, and the emission of carbon dioxide per ton of steel is large.
If the notice number is: the electric furnace flue gas waste heat utilization system disclosed in CN211012515U, in which a primary combustion section and a secondary after-combustion section connected to the bottom of the primary combustion section are arranged in a combustion chamber, and the primary combustion section is correspondingly provided with a primary combustion structure, and the secondary after-combustion section is provided with a secondary after-combustion structure, so that the electric furnace flue gas is secondarily combusted, and the adjustable inlet flue gas temperature and the steam overheating of a waste heat boiler are realized, but the serial after-combustion structure of the co-combustion chamber makes the heat control of a steam overheating notch inaccurate, resulting in large heat loss and low heat efficiency; meanwhile, the flue gas after heat exchange cannot be reused, so that the total 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 biomass afterburning type electric furnace flue gas waste heat recycling system which can accurately control secondary afterburning heat according to the condition of primary superheated steam, and has small heat loss and high heat efficiency; the flue gas after heat exchange can be reutilized, and the total emission of the flue gas is small, the emission of greenhouse gases is small, and the emission of nitrogen oxides is small.
In order to achieve the purpose, the invention adopts the following technical scheme:
a biomass afterburning type electric furnace flue gas waste heat recycling system comprises a heat preservation flue connected with an electric furnace, and further comprises a settling chamber, a primary superheater, a secondary superheater, a flue-type waste heat boiler, an economizer, a condensate water preheater, a flue gas purification device, a superheated steam user, a condenser, a deaerator, a heat accumulator, a boiler barrel and a biomass afterburning furnace, wherein the settling chamber, 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; the heat preservation flue is connected with an inlet of the settling chamber, an outlet of the settling chamber is connected with a flue gas inlet of the primary superheater, flue gas discharged by the primary superheater flows into the flue type waste heat boiler for heat exchange, and the flue gas after heat exchange is further subjected to heat exchange through the economizer and the condensate water preheater and then is purified through the flue gas purification device; the system comprises a condenser, a deaerator, a coal economizer, a primary superheater, a secondary superheater, a superheated steam user, a deaerator and a heat exchanger, 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 to be deaerated 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, a rising pipe of the boiler barrel is connected with the heat accumulator, the heat accumulator 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 connected with the secondary superheater, and flue gas generated by the biomass after-burning furnace flows into the secondary superheater.
Preferably, the living beings after-combustion stove still links to each other with the induced duct, by flue gas after the gas cleaning device purifies discharges through first exhaust pipe way, first exhaust pipe says and links to each other with chimney and flue gas backflow pipeline respectively, flue gas backflow pipeline links to each other with the induced duct, is equipped with first draught fan on the induced duct, and in first draught fan can introduce the induced duct with the outside air, the flue gas part after the gas cleaning device purifies flowed into the induced duct through flue gas backflow pipeline, and the flue gas that flows into the induced duct joins in the induced duct with the outside air.
Preferably, the system also comprises a post-combustion air preheater, the external air converged in the induced draft tube and the flue gas purified by the flue gas purification device are preheated by the post-combustion air preheater and then discharged into the biomass post-combustion furnace, and the flue gas generated by the biomass post-combustion furnace flows into the secondary superheater for heat exchange and then is subjected to heat exchange again by the post-combustion air preheater.
Preferably, the boiler barrel is provided with two down pipes, wherein one down pipe is connected with the flue type waste heat boiler, and the other down pipe is connected with the heat preservation flue.
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 the chimney through a first exhaust pipeline, and the superheated steam user comprises a steam turbine and a generator.
Preferably, the flue gas flowing into the secondary superheater and subjected to heat exchange by the afterburning air preheater is connected with a chimney through a second smoke exhaust pipeline.
Preferably, be equipped with the second draught fan on the flue gas backflow pipeline, the warp the flue gas of second exhaust pipe exhaust is discharged by the chimney after the sack cleaner removes dust, is equipped with the third draught fan on first exhaust pipe.
Further preferably, a flue gas flow regulating device is arranged on the flue gas return pipeline.
According to the technical scheme, high-temperature flue gas generated by the full-scrap steel smelting electric furnace passes through the heat-insulating flue and then is introduced into the settling chamber to perform coarse dust removal on 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, and the difficulty in dust removal is caused is avoided. The flue gas after coarse dust removal is in the one-level superheater, flue formula exhaust-heat boiler, the economizer, the comdenstion water pre-heater exchanges heat in proper order and produces the purification flue gas that still has about 80 ℃ and contains about 10% oxygen simultaneously and can be used for combustion-supporting after purifying through the gas cleaning device, through setting up the flue gas return line that links to each other with first exhaust pipe way, induced duct respectively, make this purification flue gas part flow back to flue gas return line and introduce the induced duct, thereby make the flue gas that flows into the induced duct join in the induced duct with the ambient air, participate in the biomass afterburning of biomass afterburning stove in the secondary superheater and further overheat saturated steam, reduce flue gas total emission when realizing that flue gas waste heat utilizes still further, and biomass afterburning mode is littleer than conventional fossil fuel greenhouse gas emission. Different from the conventional one-level over heater and the setting of establishing ties of second grade over heater, it causes a large amount of calorific loss to lead to the fact heat exchange inefficiency to provide heat simultaneously for one-level over heater and second grade over heater by the combustion chamber, but through independently setting up the second grade over heater outside one-level over heater and flue formula exhaust-heat boiler, make high temperature flue gas pass through one-level over heater and follow-up flue formula exhaust-heat boiler heat transfer in order after the deposit room coarse dust removal, this also provides the prerequisite for the accurate saturated steam that gets into before the steam turbine of second grade over heater provides the heat breach, through the accurate supplementary firing of accurate control of the accurate supplementary firing stove combustion state of control living beings, the heat most radiation that living beings supplementary firing stove produced is at the second grade over heater, therefore, calorific loss is little, the thermal efficiency is improved, the flue gas total further obtains reducing discharging. And the flue gas of the secondary superheater exchanges heat again through the afterburning air preheater to preheat the outside air and the recyclable flue gas and then is discharged into a second smoke discharge pipeline, so that the heat of the flue gas of the secondary superheater is reused again, and the heat loss is further reduced.
Drawings
FIG. 1 is a schematic diagram of a flue gas waste heat recycling system of the biomass afterburning electric furnace.
Detailed Description
The invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1, the system for recycling flue gas waste heat of a biomass afterburning type electric furnace comprises a heat preservation flue 1, a settling chamber 2, a primary superheater 3, a secondary superheater 4, a flue type waste heat boiler 5, an economizer 6, a condensate water preheater 7, a flue gas purification device 8, an superheated steam user 9, a condenser 10, a deaerator 11, a heat accumulator 12, a boiler barrel 13 and a biomass afterburning furnace 42, wherein the heat preservation flue 1 is connected with an external full-steel-scrap type electric furnace 100, the full-steel-scrap type electric furnace 100 basically does not produce carbon monoxide in a smelting process, the heat preservation flue 1 can be a flue lined with refractory castable, and the settling chamber is a simplest dust removal device which naturally settles dust under the action of gravity in the prior art and is not described herein. Sequentially connecting a settling chamber 2, a primary superheater 3, a convection tube bundle of a flue type waste heat boiler 5, an economizer 6, a condensate water preheater 7 and a flue gas purification device 8 through a flue gas pipeline; the method is characterized in that a heat preservation flue 1 is connected with an inlet of a settling chamber 2, an outlet of the settling chamber 2 is connected with a flue gas inlet of a primary superheater 3, so that high-temperature flue gas generated by a whole scrap steel smelting electric furnace is introduced into the settling chamber 2 for coarse dust removal after passing through the heat preservation flue 1, the problem that the dust adhesion effect of the primary superheater 3 and a subsequent flue type waste heat boiler 5 is serious, so that ash removal is difficult is avoided, the flue gas discharged by the primary superheater 3 flows into the flue type waste heat boiler 5 for heat exchange, and the flue gas after heat exchange is further subjected to heat exchange through an economizer 6 and a condensate water preheater 7 and then is purified through a flue gas purification device 8; the flue gas purification device 8 comprises an activated carbon adsorption tower 81 connected with the condensate water preheater 7 and a bag-type dust collector 82 connected with the activated carbon adsorption tower 81, the activated carbon adsorption tower 81 can effectively adsorb dioxin-like substances in flue gas, the bag-type dust collector can further purify and remove dust from the flue gas, and the purified flue gas is discharged into the atmosphere through a chimney 14. Can set up dioxin class material detection device at the entrance point of active carbon adsorption tower 81, through dioxin class material content in the flue gas that this dioxin class material detection device detected, guide the carbon spraying amount in the active carbon adsorption tower, guarantee the effect of getting rid of to dioxin class material.
The superheated steam user 9 is connected with the condenser 10, the superheated steam user 9 comprises a steam turbine 91 and a generator 92, the steam turbine 91 drives the generator 92 to generate electricity to generate exhaust steam, the exhaust steam is condensed by the condenser 10 to form condensate water, the condenser 10 is connected with the condensate water preheater 7, the condensate water preheater 7 is connected with the deaerator 11, thus, condensed water formed by condensation of the condenser 10 is subjected to heat exchange with flue gas passing through the condensed water preheater 7 and temperature rise, and then enters the deaerator 11 to be deaerated to generate deaerated water, an air source of the deaerator comes from steam flashed from a subsequent heat accumulator, the deaerated water enters the economizer 6 connected with the deaerator 11 after being pressurized by the water feed pump 111, so that the deaerated water can be subjected to further heat exchange with the flue gas in the economizer 6, the deaerated water is preheated by utilizing the low-temperature flue gas waste heat of the economizer 6 to form saturated water, the saturated water leaving the economizer 6 then enters the boiler barrel 13 connected with the economizer 6, and the boiler barrel 13 is provided with two pipes, wherein one downcomer 131 is connected with the flue type waste heat boiler 5, and the other downcomer 132 is connected with the heat preservation flue 1, so that the heat in the source heat preservation flue 1 of the high-temperature flue gas is further utilized, the heat efficiency of the flue gas is further improved, thus, two paths of saturated water in the boiler barrel 13 respectively enter the heat preservation flue 1 and the flue type waste heat boiler 5 in the two descending pipes, saturated water and smoke in the heat-insulating flue 1 and the heating surface pipe of the flue-type waste heat boiler 5 exchange heat to absorb latent heat of vaporization to form a steam-water mixture, the steam-water mixture then returns to the drum 13 to be subjected to steam-water separation, the saturated water after the steam-water separation circularly enters the heat-insulating flue 1 and the flue-type waste heat boiler 5 to be vaporized, and the saturated steam after the steam-water separation enters the heat accumulator 12 connected with the drum through the ascending pipe 133 of the drum. The heat accumulator 12 is sequentially connected with the primary superheater 3 and the secondary superheater 4 through heat exchange pipelines, the secondary superheater 4 is connected with the superheated steam user 9, so that saturated steam entering the heat accumulator 12 through the ascending pipe 133 of the drum firstly enters the primary superheater 3 to absorb high-temperature waste heat of electric furnace flue gas again to form superheated steam, then enters the secondary superheater 4 to be further superheated, the superheated steam reaches a specified superheated temperature, and then the superheated steam leaves the secondary superheater 4 to enter a steam turbine to do work to drive a generator to generate power. The dead steam after doing work is condensed by the condenser 10 to form condensed water, and the condensed water enters the condensed water preheater to circulate the process. In this embodiment, secondary superheater 4 adopts the biomass after-combustion mode, and biomass after-combustion is less than conventional fossil fuel, greenhouse gas emission, and biomass after-combustion stove 42 links to each other with secondary superheater 4, makes the flue gas that biomass after-combustion stove 42 produced flow into secondary superheater and realizes superheated steam concurrent heating. The secondary superheater 4 is independently arranged outside the primary superheater 3 and the flue-type waste heat boiler 5, so that high-temperature flue gas is subjected to heat exchange with the primary superheater 3 and the subsequent flue-type waste heat boiler 5 in sequence after being subjected to coarse dust removal through the settling chamber 2, rather than the primary superheater and the secondary superheater being communicated and arranged in series in a combustion chamber, the combustion chamber simultaneously provides heat for the primary superheater, the secondary superheater and the subsequent waste heat boiler simultaneously, and a large amount of heat loss is caused, so that the heat exchange efficiency is low, but after the heat exchange is performed on the primary superheater through the waste heat of the flue gas of the electric furnace, according to the superheated steam state before entering the secondary superheater 4, the biomass after-combustion furnace 42 is accurately used as a superheated steam gap before entering a steam turbine through the secondary superheater 4, the superheated steam heat generated by accurately supplementing heat through the primary superheater through controlling the combustion state of the biomass after-combustion furnace, the superheated steam heat is accurately supplemented through the superheated steam heat gap of the secondary superheater, and the superheated steam heat generated by the biomass after-combustion furnace is mostly radiated on the secondary superheater, the heating is greatly reduced in heat loss with the heating mode, and the heating efficiency of the heating surface radiated by the combustion chamber, so that the heat is greatly reduced in heat emission of the flue gas emission, and the flue gas emission is reduced. Because the temperature of the flue gas outlet of the electric furnace fluctuates between 250 ℃ and 850 ℃, when the smelting intensity of the electric furnace is higher, the heat gap of the superheated steam formed by the heat exchange of the primary superheater is smaller or basically has no heat gap, and at the moment, the biomass after-burning furnace only needs to ensure that the temperature of the secondary superheater is slightly higher than the superheated steam formed by the heat exchange of the primary superheater or is not lower than the superheated steam formed by the heat exchange of the primary superheater. When the smelting intensity of the electric furnace is lower, the heat gap of the superheated steam formed by heat exchange of the primary superheater is larger, the biomass quality of the biomass after-burning furnace is increased, the flue gas temperature in the secondary superheater is increased, and the superheated steam superheating temperature is ensured.
In a preferred embodiment, the biomass after-combustion furnace 42 is further connected to an induced air duct 43, a first induced draft fan 44 is disposed on the induced air duct 43, the first induced draft fan 44 introduces outside air into the induced air duct 43, the flue gas purified by the flue gas purification device 8 is discharged through a first flue gas discharge pipeline 83, the first flue gas discharge pipeline 83 is respectively connected to the chimney 14 and the flue gas backflow pipeline 84, the flue gas backflow pipeline 84 is connected to the induced air duct 43, so that part of the purified flue gas generated after purification by the flue gas purification device flows back to the induced air duct 43, and the part of the flue gas and the outside air are merged in the induced air duct, and the requirement of the mixing ratio of the two is determined according to a low-nitrogen burner of the biomass after-combustion furnace, so that oxygen-poor air suitable for combustion supporting can be formed to participate in the biomass after-combustion. The reason is that the purified flue gas generated after being purified by the flue gas purification device not only has sensible heat of about 80 ℃ but also contains about 10% of oxygen which can be used for combustion supporting of biomass, so that the waste heat of the flue gas is further utilized, and the total emission of the flue gas is reduced. And a third induced draft fan 87 is arranged on the first smoke exhaust pipeline to accelerate the heat exchange and circulation speed of the smoke.
In a preferred embodiment, the system for recycling the residual heat from the flue gas of the biomass after-burning electric furnace further comprises an after-burning air preheater 45, the external air merged in the induced air pipe 43 and the flue gas purified by the flue gas purification device are preheated by the after-burning air preheater 45 and then discharged into the biomass after-burning furnace 42, the flue gas generated by the biomass after-burning furnace 42 flows into the secondary superheater for heat exchange, and then the after-burning air after-burning 45 exchanges heat again so that the oxygen-poor air entering the biomass after-burning furnace 42 absorbs the residual heat from the flue gas and then is discharged through a second smoke exhaust pipe 46, and the second smoke exhaust pipe 46 is connected with the chimney 14 so that the part of the flue gas is discharged from the chimney 14. The outlet of the second smoke exhaust pipe 46 can be further arranged in front of the inlet of the bag-type dust remover, so that the smoke is discharged from a chimney after being dedusted by the bag-type dust remover.
In a preferred embodiment, a second induced draft fan 85 is disposed on the flue gas return pipe 84 to enable the flue gas exhausted from the first flue gas exhaust pipe 83 to be more smoothly guided to the flue gas return pipe 84, and a flue gas flow rate adjusting device 86 is disposed on the flue gas return pipe 84 to adjust the mixing ratio of the part of the flue gas and the outside air by controlling the flue gas flow rate adjusting device 86.
In the technical scheme, the flue gas flow of the electric furnace is as follows: high-temperature flue gas generated by an electric furnace is introduced into a settling chamber 2 through a heat-insulating flue 1 to carry out coarse dust removal on the flue gas, the high-temperature flue gas after the coarse dust removal sequentially enters a primary superheater 3 and a flue-type waste heat boiler 5 to carry out heat exchange, and the flue gas after the heat exchange is further subjected to heat exchange through an economizer 6 and a condensate water preheater 7 and then is purified through a flue gas purification device 8; one part of the purified flue gas is discharged into the atmosphere through the chimney 14, and the other part of the purified flue gas flows back to the induced air pipe 43 through the flue gas return pipeline 84 and is converged with the outside air in the induced air pipe to form oxygen-poor air suitable for supporting combustion to participate in biomass afterburning, and the flue gas generated by the biomass afterburning furnace 42 flows into the secondary superheater for heat exchange and then is subjected to heat exchange again through the afterburning air preheater 45, so that the oxygen-poor air entering the biomass afterburning furnace 42 absorbs the waste heat of the flue gas and then is discharged through the second smoke discharge pipeline 46 and the chimney 14.
The working medium flow is as follows: condensed water formed by condensation of a condenser 10 is subjected to heat exchange with flue gas passing through the condensed water preheater 7 and temperature rise, then enters a deaerator 11 to be deaerated to generate deaerated water, a gas source of the deaerator comes from steam flashed from a subsequent heat accumulator, the deaerated water is pressurized by a water feed pump 111 and then enters an economizer 6 connected with the deaerator 11, the deaerated water can further exchange heat with the flue gas in the economizer 6, low-temperature flue gas waste heat of the economizer 6 is used for preheating the deaerated water to form saturated water, the saturated water leaving the economizer 6 then enters a boiler barrel 13 connected with the economizer 6, two paths of the saturated water in the boiler barrel 13 respectively enter a heat preservation flue 1 and a flue type waste heat boiler 5 in two descending pipes, the saturated water in the heat preservation flue 1 and the heating surface pipes of the flue type waste heat boiler 5 and the flue gas exchange heat to absorb latent heat to form a steam-water mixture, the steam-water mixture then returns to the boiler barrel 13 to be separated, the saturated water after the steam-water separation circularly enters the heat preservation flue 1 and the heat accumulator 12 connected with the steam-water through the ascending pipes of the boiler barrel. The saturated steam entering the heat accumulator 12 firstly enters the primary superheater 3 to absorb the high-temperature waste heat of the electric furnace flue gas again to form superheated steam, then enters the secondary superheater 4 to be further superheated, so that the superheated steam reaches a specified superheated temperature, and then the superheated steam leaves the secondary superheater 4 to enter the steam turbine to do work to drive the generator to generate power. The dead steam after doing work is condensed by the condenser 10 to form condensed water, and the condensed water enters the condensed water preheater to circulate the process. By utilizing the scheme, the supplementary combustion gas consumption can be greatly reduced, the reduction rate of the supplementary combustion gas consumption can reach 30-60%, the emission reduction of the total smoke gas can be reduced by about 10%, and the emission reduction rate of carbon dioxide and nitric oxide of the supplementary combustion furnace is at least over 50% compared with the prior electric furnace waste heat power generation technology.
The present embodiment is only illustrative of the concept and implementation of the present invention, and is not limited thereto, and technical solutions that are not substantially changed are still within the protection scope under the concept of the present invention.
Claims (8)
1. A biomass afterburning type electric furnace flue gas waste heat recycling system comprises a heat preservation flue connected with an electric furnace, and is characterized by further comprising a settling chamber, a primary superheater, a secondary superheater, a flue type waste heat boiler, an economizer, a condensate water preheater, a flue gas purification device, a superheated steam user, a condenser, a deaerator, a heat accumulator, a boiler barrel and a biomass afterburning furnace, wherein the settling chamber, 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; the heat preservation flue is connected with an inlet of the settling chamber, an outlet of the settling chamber is connected with a flue gas inlet of the primary superheater, flue gas discharged by the primary superheater flows into the flue type waste heat boiler for heat exchange, and the flue gas after heat exchange is further subjected to heat exchange through the economizer and the condensate water preheater and then is purified through the flue gas purification device; the system comprises a condenser, a deaerator, a coal economizer, a primary superheater, a secondary superheater, a superheated steam user, a deaerator and a heat exchanger, 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 to be deaerated 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, a rising pipe of the boiler barrel is connected with the heat accumulator, the heat accumulator 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-combustion furnace is connected with the secondary superheater, and flue gas generated by the biomass after-combustion furnace flows into the secondary superheater.
2. The system according to claim 1, wherein the biomass afterburning electric furnace is further connected to an induced duct, the flue gas purified by the flue gas purification device is discharged through a first flue gas duct, the first flue gas duct is respectively connected to a chimney and a flue gas return duct, the flue gas return duct is connected to the induced duct, a first induced draft fan is disposed on the induced duct, the first induced draft fan can introduce external air into the induced duct, the flue gas purified by the flue gas purification device flows into the induced duct through the flue gas return duct, and the flue gas flowing into the induced duct and the external air are merged in the induced duct.
3. The system for recycling the waste heat of the flue gas of the biomass after-burning electric furnace according to claim 2, further comprising an after-burning air preheater, wherein the outside air merged in the induced draft tube and the flue gas purified by the flue gas purification device are preheated by the after-burning air preheater and then discharged into the biomass after-burning furnace, and the flue gas generated by the biomass after-burning furnace flows into the secondary superheater for heat exchange and then is subjected to heat exchange again by the after-burning air preheater.
4. The system for recycling the flue gas waste heat of the biomass after-burning electric furnace according to claim 3, wherein the drum is provided with two down pipes, one down pipe is connected with the flue type waste heat boiler, and the other down pipe is connected with the heat preservation flue.
5. The system for recycling the waste heat of the flue gas of the biomass afterburning electric furnace as claimed in claim 3 or 4, wherein the flue gas purification 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 first exhaust pipeline, and the superheated steam user comprises a steam turbine and a generator.
6. The system for recycling the flue gas waste heat of the biomass afterburning electric furnace according to claim 5, wherein the flue gas flowing into the secondary superheater after heat exchange by the afterburning air preheater is connected with a chimney through a second smoke exhaust pipeline.
7. The system for recycling the waste heat of the flue gas of the biomass afterburning electric furnace according to claim 6, wherein a second induced draft fan is arranged on the flue gas return pipeline, the flue gas discharged from the second smoke discharge pipeline is dedusted by a bag-type deduster and then discharged from a chimney, and a third induced draft fan is arranged on the first smoke discharge pipeline.
8. The system for recycling the waste heat of the flue gas of the biomass afterburning electric furnace according to claim 2, wherein a flue gas flow regulating device is arranged on the flue gas return pipeline.
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| CN116592655A (en) * | 2023-06-01 | 2023-08-15 | 江阴市盛龙冶金机械制造有限公司 | Method for preheating scrap steel by utilizing flue gas |
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