CN114636316A - Waste heat recovery system matched with HISMELT smelting reduction iron-making system - Google Patents
Waste heat recovery system matched with HISMELT smelting reduction iron-making system Download PDFInfo
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- CN114636316A CN114636316A CN202210245028.6A CN202210245028A CN114636316A CN 114636316 A CN114636316 A CN 114636316A CN 202210245028 A CN202210245028 A CN 202210245028A CN 114636316 A CN114636316 A CN 114636316A
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- 238000011084 recovery Methods 0.000 title claims abstract description 47
- 239000002918 waste heat Substances 0.000 title claims abstract description 47
- 230000009467 reduction Effects 0.000 title claims abstract description 30
- 238000003723 Smelting Methods 0.000 title claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 141
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 111
- 239000003546 flue gas Substances 0.000 claims abstract description 111
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 230000001174 ascending effect Effects 0.000 claims abstract description 25
- 239000002826 coolant Substances 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 229920006395 saturated elastomer Polymers 0.000 claims description 14
- 230000007704 transition Effects 0.000 claims description 14
- 239000000779 smoke Substances 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims 2
- 206010022000 influenza Diseases 0.000 claims 2
- 239000000428 dust Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 239000002956 ash Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000013618 particulate matter Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- -1 this Chemical compound 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a waste heat recovery system matched with a HISMELT smelting reduction iron-making system, which comprises: the cooling flue and the flue steam pocket are arranged at the outlet end of the cooling flue, the connecting flue is arranged at the outlet end of the cooling flue, the outlet end of the connecting flue is connected to the separator, the cooling flue at the inlet section of the cooling flue is connected to the reaction furnace, and a cooling medium is introduced into the connecting flue to cool the flue gas; the flue gas outlet of the separator is connected with a steam superheater, the superheater flue gas outlet of the steam superheater is connected with a fire tube boiler, a boiler ascending tube and a boiler descending tube of the fire tube boiler are connected to a boiler drum, the fire tube boiler is connected with a fire tube economizer, a flue gas discharging barrel is arranged at the bottom of the fire tube economizer, an economizer water outlet pipe on the fire tube economizer supplies water for the fire tube boiler drum and a flue drum, steam output by the flue drum and the fire tube boiler drum is conveyed to the steam superheater, and a superheated steam output pipe is arranged on the steam superheater. The invention can effectively avoid the slag bonding phenomenon and greatly improve the heat efficiency.
Description
Technical Field
The invention relates to a waste heat recovery system, in particular to a waste heat recovery system matched with an HISMELT smelting reduction iron-making system.
Background
The HISMELT smelting reduction iron-making technology is a short-flow iron-making technology for producing liquid iron by using non-coking coal and iron ore powder in a spraying mode. The process does not need the original coke and pellet processes for iron making, and directly adopts coal powder and iron ore powder for iron making, so that the process has the advantages of strong raw material adaptability, small environmental pollution and high product quality, and the factory construction is relatively simple, thereby having extremely high social, economic and environmental values. The smelting reduction ironmaking technology is a technological improvement on the blast furnace ironmaking technology, and a waste heat recovery system is a key part of the whole system.
The HISMELT reaction furnace, also called as a reduction furnace, in an HISMELT smelting reduction iron-making system generates high-temperature flue gas with the pressure close to 1.0bar and the temperature of about 1450 ℃, and the high-temperature flue gas contains CO and H2Etc., and also contains a large amount of bonded dust in a molten state. A waste heat recovery system in the HISMELT smelting reduction iron-making system converts heat energy in high-temperature flue gas into steam and then generates power.
The specific structure of the waste heat recovery system in the current hismellt iron making system can be seen in chinese patent CN103773912A, which mainly comprises: the flue is connected with the reduction furnace and comprises an ascending section and a descending section, the ascending section flue is connected with the upper end of the descending section flue through a transition flue, the lower end of the descending section flue is provided with a connecting flue, the connecting flue is connected with a high-temperature cyclone separator, and a flue gas outlet of the high-temperature cyclone separator is connected with a waste heat boiler. High-temperature flue gas generated by the reduction furnace sequentially passes through the ascending section flue, the transition section flue and the descending section flue to release heat, then enters a high-temperature cyclone separator through the connecting flue, large particles in the high-temperature flue gas are removed by the high-temperature cyclone separator, and the high-temperature flue gas without the large particles enters the waste heat boiler to be subjected to heat transfer.
The waste heat recovery system in the HISMELT smelting reduction iron-making system has the following technical problems in the operation process: the high-temperature flue gas after the large particles are removed by the high-temperature cyclone separator still contains more high-temperature bonding dust with smaller particle diameter, and the high-temperature bonding dust particles are characterized in that the surface temperature is relatively lower, but the core temperature in the high-temperature flue gas is still very high, namely the bonding dust with small particle diameter remained in the high-temperature flue gas is not completely cooled, and the high-temperature bonding dust is easy to bond on the pipe wall of a heat exchange pipe in a waste heat boiler, so that slagging is formed on the pipe wall of the heat exchange pipe, and the more the high-temperature bonding dust is, the larger the caking is easy to fall off and block. Along with the time, the heat exchange effect of the waste heat boiler is continuously reduced, and the potential safety hazard is more and more serious.
Disclosure of Invention
The purpose of the invention is: the waste heat recovery system matched with the HISMELT smelting reduction iron-making system can solve the technical problem that particles in high-temperature flue gas generate slag on the pipe wall of the heat exchange pipe, and further greatly improves the heat recovery efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that: the waste heat recovery system matched with the HISMELT smelting reduction ironmaking system comprises: the cooling flue with the membrane wall structure comprises a flue water wall ascending pipe and a flue water wall descending pipe of a membrane water wall of the cooling flue, which are connected to a flue steam pocket, a connecting flue is arranged at the outlet end of the cooling flue, the outlet of the connecting flue is connected to a separator for separating solid particles in gas, the cooling flue comprises an inlet section cooling flue, which is connected to a reaction furnace, the inlet section cooling flue is arranged from the reaction furnace in a gradually inclined and upward manner, the angle formed by the inlet section cooling flue and the horizontal direction is more than or equal to 45 ℃ and less than or equal to 60 ℃, slag in a molten state in high-temperature flue gas in the inlet section cooling flue can flow back to the reaction furnace along the inlet section cooling flue, the temperature of the flue gas at the outlet end of the cooling flue is controlled to be 750-1000 ℃, introducing a cooling medium into the connecting flue to reduce the temperature of the flue gas entering the connecting flue to 600-700 ℃; the flue gas outlet of the separator is connected with a steam superheater, the superheater flue gas outlet of the steam superheater is connected with a fire tube boiler, a boiler ascending pipe and a boiler descending pipe of the fire tube boiler are connected to a boiler drum, the fire tube boiler is connected with a fire tube economizer through a transition section smoke chamber, the bottom of the fire tube economizer is provided with a flue gas discharge barrel with a flue gas discharge port, the fire tube economizer is provided with an economizer water inlet pipe and an economizer water outlet pipe, the economizer water outlet pipe is connected with a fire tube boiler drum water supply pipe and a flue drum water supply pipe, the fire tube boiler drum water supply pipe is connected to the fire tube boiler drum, the flue drum water supply pipe is connected to the flue drum, the flue drum is provided with a flue drum steam output pipe, the fire tube boiler drum is provided with a saturated steam output pipe, and the flue drum steam output pipe and the saturated steam output pipe are converged and connected to a superheater steam input end of the steam superheater, and a superheated steam output pipe is arranged on the steam superheater.
Further, the waste heat recovery system matched with the hismellt smelting reduction iron-making system is characterized in that the cooling medium adopts cooling water, or flue gas output from a flue gas outlet of the flue gas outlet cylinder is desulfurized, dedusted and purified to be used as the cooling medium.
Further, the residual heat recovery system matched with the HISMELT smelting reduction iron-making system is characterized in that the cooling medium in the connecting flue is introduced through spraying of nozzles, the nozzles are arranged on the top and the bottom in the connecting flue and the inner walls of the connecting flue on the two sides, and the nozzles on the top and the bottom in the connecting flue and the inner walls of the connecting flue on the two sides are arranged at intervals along the length direction of the connecting flue.
Furthermore, the cooling flue also comprises a circuitous section cooling section flue, the circuitous section cooling flue comprises an ascending section cooling flue and a descending section cooling flue which are vertically and parallelly arranged at intervals, the upper end parts of the ascending section cooling flue and the descending section cooling flue are communicated through a transition section cooling flue, the lower end of the ascending section cooling flue is communicated with the upper end of an inlet section cooling flue, the bottom of the descending section cooling flue is connected with a descending section smoke discharging cylinder, a cooling flue dust discharging hopper is arranged at the bottom of the descending section smoke discharging cylinder, and a connecting flue is connected with the descending section smoke discharging cylinder.
Furthermore, the aforementioned waste heat recovery system matching with the hismellt smelting reduction ironmaking system, wherein the transition section cooling flue comprises: the first section of turning cooling flue and the second section of turning cooling flue are arranged in a mirror image mode, the first section of turning cooling flue is bent upwards from the top end of the ascending section cooling flue and towards the descending section cooling flue, the second section of turning cooling flue is bent upwards from the top end of the descending section cooling flue and towards the ascending section cooling flue, and the first section of turning cooling flue is communicated with the second section of turning cooling flue at the top.
Furthermore, the waste heat recovery system matched with the HISMELT smelting reduction iron-making system is characterized in that two flue gas explosion-proof valves are arranged at the top of the transition section cooling flue and are respectively positioned on the turning first-section cooling flue and the turning second-section cooling flue.
Further, the waste heat recovery system matched with the hismellt smelting reduction iron-making system is characterized in that the heating pipe in the steam superheater is a serpentine heating pipe.
Furthermore, the waste heat recovery system matched with the hismellt smelting reduction iron-making system is provided, wherein the fire tube boiler and the fire tube economizer are both in a vertical structure.
The invention has the advantages that: one, entrance cooling flue upwards sets up by reaction furnace one end is upwards progressively inclined to the angle more than or equal to 45 degrees and less than or equal to 60 degrees that entrance cooling flue and horizontal direction are, can make the slag of melting form flow back to the reaction furnace along entrance cooling flue in the high temperature flue gas like this, thereby effectively reduce the volume of melting form particulate matter in the high temperature flue gas at waste heat recovery system source, just also effectively avoid the phenomenon of waste heat recovery system equipment slagging scorification. Secondly, the temperature of the high-temperature flue gas output by the cooling flue is controlled to be 750-1000 ℃, and a cooling medium is sprayed into the connecting flue to cool the high-temperature flue gas to 600-700 ℃, so that the particulate matters in the high-temperature flue gas are completely cooled, namely, the inner cores of the particulate matters in the high-temperature flue gas are not in a molten state any more, and the phenomenon that the particulate matters adhere to the pipe wall of the heat exchange pipe to generate slag bonding after the high-temperature flue gas enters the heat exchange equipment can be avoided, so that the heat exchange effect is effectively improved, and the service life of the waste heat recovery system is prolonged. Based on the former two points, the waste heat recovery system adopts the steam superheater, the arrangement of the steam superheater greatly improves the heat recovery efficiency, reduces the temperature of outlet flue gas, namely effectively reduces the temperature of finally discharged flue gas, and the flue gas with reduced temperature can be directly subjected to the purification treatment of dry dust removal, such as direct cloth bag dust removal, so that the purification treatment cost of waste gas is effectively saved. And the fire tube boiler and the fire tube economizer are of vertical structures, adopt longitudinal scouring and have good self-ash-cleaning effect, thereby effectively improving the heat exchange effect of the heat exchange equipment and prolonging the service life of the equipment.
Drawings
FIG. 1 is a schematic structural diagram of a waste heat recovery system of the invention, which is matched with a HISMELT smelting reduction iron-making system.
Fig. 2 is a schematic view of the structure of the cooling flue in fig. 1.
Detailed Description
The invention is described in further detail below with reference to the figures and preferred embodiments.
As shown in fig. 1 and 2, the waste heat recovery system matched with the hismellt smelting reduction iron-making system comprises: a cooling flue 1 of a membrane water wall structure, a flue water wall ascending pipe 21 and a flue water wall descending pipe 22 of the membrane water wall of the cooling flue 1 are connected to a flue steam drum 2. The cooling flue 1 comprises an inlet section cooling flue 11, the inlet section cooling flue 11 is connected with the reaction furnace 3, the inlet section cooling flue 11 is arranged by the reaction furnace 3 in a gradually inclined and upward mode, an angle theta formed by the inlet section cooling flue 11 and the horizontal direction is greater than or equal to 45 degrees and less than or equal to 60 degrees, and molten slag in high-temperature flue gas in the inlet section cooling flue 11 can flow back to the reaction furnace 3 along the inlet section cooling flue 11. The temperature of the flue gas at the outlet end of the cooling flue 1 is controlled to 750-1000 ℃.
In this embodiment, the cooling flue 1 further includes a detour section cooling flue 12, the detour section cooling flue 12 includes an ascending section cooling flue 121 and a descending section cooling flue 122 that are vertically and parallelly arranged at intervals, the upper end portions of the ascending section cooling flue 121 and the descending section cooling flue 122 are communicated by a transition section cooling flue, the lower end of the ascending section cooling flue 121 is communicated with the upper end of the inlet section cooling flue 11, the bottom of the descending section cooling flue 122 is connected with a descending section smoke discharging barrel 123, and a cooling flue ash discharging hopper 124 is arranged on the bottom of the descending section smoke discharging barrel 123. The descending section smoke exhaust tube 123 is connected to the connecting flue 4.
The transition section cooling flue in this embodiment includes: the first section of turn cooling flue 125 and the second section of turn cooling flue 126 that mirror symmetry set up, the first section of turn cooling flue 125 and the second section of turn cooling flue 126 mirror symmetry set up its purpose: the installation and the maintenance are convenient, and the manufacturing and production cost is reduced. The turning first-stage cooling flue 125 is bent upwards from the top end of the ascending section cooling flue 121 and towards the descending section cooling flue 122, the turning second-stage cooling flue 126 is bent upwards from the top end of the descending section cooling flue 122 and towards the ascending section cooling flue 121, and the turning first-stage cooling flue 125 is communicated with the turning second-stage cooling flue 126 at the top. Two flue gas explosion-proof valves 127 are arranged at the top of the transition section cooling flue, and the two flue gas explosion-proof valves 127 are respectively positioned on the turning first-section cooling flue 125 and the turning second-section cooling flue 126.
And introducing a cooling medium into the connecting flue 4 to reduce the temperature of the flue gas entering the connecting flue 4 to 600-700 ℃. At the temperature, the particles in the high-temperature flue gas can be completely cooled, namely the particles are not molten from the inner core to the outer surface. In this embodiment, the cooling medium in the connecting flue 4 is sprayed by the nozzle 41, the nozzle 41 is disposed on the top, bottom and inner walls of the connecting flue at both sides in the connecting flue 4, and the nozzles 41 on the top, bottom and inner walls of the connecting flue at both sides in the connecting flue 4 are disposed at intervals along the length direction of the connecting flue 4. The introduction of the cooling medium needs to be ensured so as not to cause safety problems such as explosion, combustion and the like in the connecting flue 4.
The outlet of the connecting flue 4 is connected to a separator 5 for separating solid particles from the gas. The bottom of the separator 5 is provided with a separator hopper 51. The separator 5 adopts a high-temperature cyclone separator. The high-temperature cyclone separator can effectively remove particles, and prevents the particles from scouring and wearing the waste heat recovery system.
The flue gas outlet of the separator 5 is connected with a steam superheater 6, the superheater flue gas outlet of the steam superheater 6 is connected with a fire tube boiler 7, a boiler riser 711 and a boiler downcomer 712 are arranged between the fire tube boiler 7 and a fire tube boiler drum 71, and the fire tube boiler 7 is connected with a fire tube economizer 9 through a transition section flue chamber 8. The bottom of the fire tube economizer 9 is provided with a flue gas discharging cylinder 91 with a flue gas discharging port 911, and the bottom of the flue gas discharging cylinder 91 is provided with a discharging cylinder ash hopper 912. In this embodiment, both the fire tube boiler 7 and the fire tube economizer 9 are of a vertical structure. The fire tube economizer 9 is provided with an economizer inlet pipe 92 and an economizer outlet pipe 93, and the economizer outlet pipe 93 is connected with a fire tube boiler water supply pipe 713 and a flue drum water supply pipe 201. Fire tube boiler feed pipe 713 is connected to fire tube boiler drum 71 and flue drum feed pipe 201 is connected to flue drum 2. The flue drum 2 is provided with a flue drum steam output pipe 23, and the fire tube boiler drum 71 is provided with a saturated steam output pipe 714. In this embodiment, the flue drum steam output pipe 23 and the saturated steam output pipe 714 are converged and connected to the superheater steam input end 61 of the steam superheater 6, and the superheated steam output pipe 62 is arranged on the steam superheater 6. The cooling medium is cooling water, or the flue gas output from the flue gas outlet 911 of the flue gas outlet cylinder 91 is desulfurized, dedusted and purified to be used as the cooling medium, and the flue gas discharged from the flue gas outlet 911 is used as the cooling medium, so that the waste heat recovery cost can be effectively reduced.
The working principle is as follows: smoke process: high-temperature flue gas generated by the reaction furnace 3 enters the cooling flue 1 through the inlet section cooling flue 11, and because the inlet section cooling flue 11 is obliquely arranged and the inclination angle theta is more than or equal to 45 degrees and less than or equal to 60 degrees, molten slag in the inlet section cooling flue 11 can well flow back to the reaction furnace 3. The amount of the molten ash entering the waste heat recovery system is greatly reduced at the inlet of the waste heat recovery system, so that the risk of slagging of the waste heat recovery system is effectively reduced.
The high-temperature flue gas enters the roundabout section cooling flue 12 through the inlet section cooling flue 11, the high-temperature flue gas sequentially passes through the ascending section cooling flue 121, the turning first-section cooling flue 125, the turning second-section cooling flue 126 and the descending section cooling flue 122 in the roundabout section cooling flue 12, the temperature is reduced to 750-1000 ℃ after the heat is continuously released, and then the high-temperature flue gas enters the descending section smoke exhaust cylinder 123. Ash in the drop leg discharge drum 123 is discharged from the cooling flue hopper 124. The high-temperature flue gas in the descending section smoke exhaust cylinder 123 enters the connecting flue 4.
The nozzle 41 in the connecting flue 4 sprays cooling medium to further cool the high-temperature flue gas, and the cooling medium adopts cooling water or flue gas output by the flue gas outlet 911 of the flue gas discharging cylinder 91, and both of the cooling medium and the flue gas can effectively cool the high-temperature flue gas. The waste gas that adopts flue gas exhaust cylinder 91's flue gas discharge port 911 output cools down, and then a benefit is: waste gas utilization, reduce waste heat recovery cost. The high-temperature flue gas is further cooled to 600-700 ℃ in the connecting flue 4, and the ash residue in the high-temperature flue gas is further cooled to the temperature that the inner core is not molten.
The high-temperature flue gas after further cooling in the connecting flue 4 enters a separator 5 for solid particle separation. The separator 5 separates the high-temperature flue gas from the particulate matters with larger grain sizes, and the high-temperature flue gas is cooled for the second time in the connecting flue 4, so the particulate matters still remained in the high-temperature flue gas after being separated by the separator 5, and the appearance of the particulate matters to the inner core are not in a molten state because the temperature of the inner core of the particulate matters is further reduced, so that the possibility of forming slag formation of the particulate matters in a waste heat recovery system is greatly reduced.
The high-temperature flue gas separated by the separator 5 enters a steam superheater 6 through a flue gas outlet of the separator 5, and the steam superheater 6 adopts a serpentine heat exchange tube. Although snakelike heat exchanger tube bank among the steam over heater 6 is intensive, particulate matter has cooled off completely in the high temperature flue gas of separator 5 output to the kernel also no longer is the melting form, also the particulate matter is all fully cooled, such high temperature flue gas gets into heat exchanger tube bank intensive steam over heater 6, can not produce the slagging scorification on steam over heater 6's heat exchanger tube bank, this is exactly that can adopt steam over heater 6's key place among this waste heat recovery system, adopt steam over heater 6 to effectively improve whole waste heat recovery system's heat recovery efficiency, and the temperature of greatly reduced flue gas discharge port 911 exhaust flue gas. The flue gas output by the steam superheater 6 enters a fire tube boiler 7, the flue gas further releases heat in the fire tube boiler 7, the flue gas output by the fire tube boiler 7 enters a fire tube economizer 9 through a transition section smoke chamber 8, the flue gas after releasing heat in the fire tube economizer 9 is discharged outwards from a flue gas discharge port 911 on a flue gas discharge cylinder 91, and a part of the flue gas discharged from the flue gas discharge port 911 can be used as a cooling medium in a connecting flue 4. The ash in the flue gas exhaust cylinder 91 is discharged from the exhaust cylinder ash hopper 912.
Water range: external feed water enters the fire tube economizer 9 through a fire tube economizer water inlet pipe 92, water which absorbs heat in the fire tube economizer 9 enters the fire tube boiler drum 71 through an economizer water outlet pipe 93 and a fire tube boiler water supply pipe 713, and enters the flue drum 2 through the economizer water outlet pipe 93 and a flue drum water supply pipe 201. The hot water in the fire tube boiler drum 71 enters the fire tube boiler 7 through the boiler downcomer 712, the steam-water mixture formed after the heat of the flue gas is absorbed in the fire tube boiler 7 enters the fire tube boiler drum 71 through the boiler riser 711, and the saturated steam generated by the fire tube boiler drum 71 is output from the saturated steam output pipe 714.
Hot water in the flue steam drum 2 enters a membrane water-cooled wall of the cooling flue 1 through a flue water-cooled wall descending pipe 22, the hot water in the membrane water-cooled wall absorbs heat of high-temperature flue gas to form steam, the steam enters the flue steam drum 2 through a flue water-cooled wall ascending pipe 21, and saturated steam generated by the flue steam drum 2 is output through a flue steam drum steam output pipe 23.
The saturated steam output by the flue drum steam output pipe 23 and the saturated steam output by the fire tube boiler drum 71 through the saturated steam output pipe 714 are converged into the steam superheater 6, and the saturated steam absorbs the heat of the high-temperature flue gas in the steam superheater 6 to form superheated saturated steam which can be used for power generation and is output through the hot steam output pipe 62.
The invention has the advantages that: one, inlet section cooling flue 11 is upwards set up by 3 one ends of reacting furnace slope gradually that make progress to the angle more than or equal to 45 degrees and less than or equal to 60 degrees that inlet section cooling flue 11 and horizontal direction are, can make the slag of melting form in the high temperature flue gas flow back to reacting furnace 3 along inlet section cooling flue like this, thereby the volume of melting form particulate matter in the high temperature flue gas is effectively reduced at waste heat recovery system source, just also effectively avoids the phenomenon of waste heat recovery system equipment slagging scorification. And secondly, controlling the temperature of the high-temperature flue gas output by the cooling flue to be 750-1000 ℃, and spraying a cooling medium into the connecting flue 4 to cool the high-temperature flue gas to 600-700 ℃, so that the particulate matters in the high-temperature flue gas are completely cooled, namely, the inner cores of the particulate matters in the high-temperature flue gas are not molten any more, and the phenomenon that the particulate matters are adhered to the pipe wall of a heat exchange pipe to cause slag bonding after the high-temperature flue gas enters heat exchange equipment can be avoided, thereby effectively improving the heat exchange effect and prolonging the service life of a waste heat recovery system. Based on the former two points, the waste heat recovery system adopts the steam superheater, the arrangement of the steam superheater greatly improves the heat recovery efficiency, and reduces the temperature of the outlet flue gas, i.e. the temperature of the flue gas discharged from the final flue gas outlet 911 is effectively reduced, and the flue gas with the reduced temperature can be directly subjected to the purification treatment of dry dust removal, such as direct cloth bag dust removal, so that the purification treatment cost of the waste gas is effectively saved. And the fire-tube boiler and the fire-tube economizer are of vertical structures, adopt longitudinal flushing, have good self-ash-cleaning effect, and can effectively improve the heat exchange effect of the heat exchange equipment and prolong the service life of the equipment.
Claims (8)
1. The waste heat recovery system matched with the HISMELT smelting reduction ironmaking system comprises: the cooling flue of membrane wall structure, the flue water-cooling wall tedge and the flue water-cooling wall downcomer of the membrane wall of cooling flue are connected to the flue steam pocket, and the exit end of cooling flue is provided with the connection flue, and the exit linkage of connection flue is connected to the separator that is arranged in the solid particle in the separation gas, its characterized in that: the cooling flue comprises an inlet section cooling flue, the inlet section cooling flue is connected to the reaction furnace, the inlet section cooling flue is arranged from the reaction furnace to gradually incline upwards, the angle formed by the inlet section cooling flue and the horizontal direction is more than or equal to 45 degrees and less than or equal to 60 degrees, molten slag in high-temperature flue gas in the inlet section cooling flue can flow back to the reaction furnace along the inlet section cooling flue, the temperature of the flue gas at the outlet end of the cooling flue is controlled to be 750-1000 ℃, and a cooling medium is introduced into the connecting flue so that the temperature of the flue gas entering the connecting flue is reduced to 600-700 ℃; the flue gas outlet of the separator is connected with a steam superheater, the superheater flue gas outlet of the steam superheater is connected with a fire tube boiler, a boiler ascending pipe and a boiler descending pipe of the fire tube boiler are connected to a boiler drum, the fire tube boiler is connected with a fire tube economizer through a transition section smoke chamber, the bottom of the fire tube economizer is provided with a flue gas discharge barrel with a flue gas discharge port, the fire tube economizer is provided with an economizer water inlet pipe and an economizer water outlet pipe, the economizer water outlet pipe is connected with a fire tube boiler drum water supply pipe and a flue drum water supply pipe, the fire tube boiler drum water supply pipe is connected to the fire tube boiler drum, the flue drum water supply pipe is connected to the flue drum, the flue drum is provided with a flue drum steam output pipe, the fire tube boiler drum is provided with a saturated steam output pipe, and the flue drum steam output pipe and the saturated steam output pipe are converged and connected to a superheater steam input end of the steam superheater, and a superheated steam output pipe is arranged on the steam superheater.
2. The waste heat recovery system of claim 1, wherein the system is adapted to a hismellt smelting reduction ironmaking system, and comprises: the cooling medium adopts cooling water, or the flue gas output from the flue gas outlet of the flue gas discharging cylinder is desulfurized, dedusted and purified to be used as the cooling medium.
3. The waste heat recovery system of claim 2, wherein the system is adapted to a hismellt smelting reduction ironmaking system, and comprises: the cooling medium in the connecting flue is introduced by spraying through nozzles, the nozzles are arranged on the top and the bottom in the connecting flue and the inner walls of the connecting flues at two sides, and the nozzles on the top and the bottom in the connecting flue and the inner walls of the connecting flues at two sides are arranged at intervals along the length direction of the connecting flue.
4. The system for recovering waste heat from an iron making system by HISMELT reduction according to claim 2 or 3, wherein: the cooling flue still include circuitous section cooling flue, circuitous section cooling flue include vertical ascending section cooling flue and the descending section cooling flue that sets up and parallel interval, ascending section cooling flue and descending section cooling flue's upper end is by changeover portion cooling flue intercommunication, ascending section cooling flue's lower extreme and entry section cooling flue's upper end intercommunication, descending section cooling flue's bottom is connected with the descending section chimney body, set up cooling flue ash discharging hopper on the bottom of descending section chimney body, connect flue and descending section chimney body connection.
5. The waste heat recovery system of claim 4, matched with a hismellt smelting reduction ironmaking system, and characterized in that: the transition section cooling flue includes: the one section cooling flue of turn and the two-section cooling flue of turn that the mirror image set up, turn one section cooling flue by ascending section cooling flue's top upwards and to descending section cooling flue direction bending, turn two-section cooling flue by descending section cooling flue's top upwards and to ascending section cooling flue direction bending, turn one section cooling flue and turn two-section cooling flue are linked together at the top.
6. The waste heat recovery system of claim 5, wherein the system is adapted to a hismellt smelting reduction ironmaking system, and comprises: two flue gas explosion-proof valves are arranged at the top of the transition section cooling flue and are respectively positioned on the turning first-section cooling flue and the turning second-section cooling flue.
7. The waste heat recovery system of claim 1, wherein the system is adapted to a hismellt smelting reduction ironmaking system, and comprises: a heating pipe in the steam superheater adopts a snake-shaped heating pipe.
8. The waste heat recovery system of claim 1, wherein the system is adapted to a hismellt smelting reduction ironmaking system, and comprises: the fire tube boiler and the fire tube economizer are both of vertical structures.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245028.6A CN114636316B (en) | 2022-03-14 | 2022-03-14 | Waste heat recovery system matched with HISMELT smelting reduction ironmaking system |
| PCT/CN2022/143823 WO2023173902A1 (en) | 2022-03-14 | 2022-12-30 | Waste-heat recovery system matching hismelt smelting reduction ironmaking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210245028.6A CN114636316B (en) | 2022-03-14 | 2022-03-14 | Waste heat recovery system matched with HISMELT smelting reduction ironmaking system |
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| CN114636316A true CN114636316A (en) | 2022-06-17 |
| CN114636316B CN114636316B (en) | 2024-01-26 |
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| WO (1) | WO2023173902A1 (en) |
Cited By (1)
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| WO2023173902A1 (en) * | 2022-03-14 | 2023-09-21 | 苏州海陆重工股份有限公司 | Waste-heat recovery system matching hismelt smelting reduction ironmaking system |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2023173902A1 (en) | 2023-09-21 |
| CN114636316B (en) | 2024-01-26 |
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