CN210570060U - Flue gas waste heat utilization system of steel plant - Google Patents
Flue gas waste heat utilization system of steel plant Download PDFInfo
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- CN210570060U CN210570060U CN201921633124.8U CN201921633124U CN210570060U CN 210570060 U CN210570060 U CN 210570060U CN 201921633124 U CN201921633124 U CN 201921633124U CN 210570060 U CN210570060 U CN 210570060U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The utility model discloses a flue gas waste heat utilization system of a steel plant, which comprises an electric furnace and a smoke exhaust pipe, wherein the end part of the smoke exhaust pipe is connected with a heat accumulator, a smoke outlet pipe is arranged on the heat accumulator, a three-way valve is arranged at the end part of the smoke outlet pipe, one outlet of the three-way valve is communicated with an air inlet of a scrap iron preheater, and the other outlet of the three-way valve is connected with a flue gas inlet of a waste heat recoverer; the vertical baffle of installing in the waste heat recoverer, the lower extreme of baffle is provided with down into the mouth, and the upper end of baffle is provided with last mouth, and the baffle separates into high temperature recovery chamber and low temperature recovery chamber with waste heat recoverer's inner chamber, and high temperature heat exchanger tube bank is installed to the high temperature recovery intracavity, and a plurality of low temperature heat exchanger tube banks have been arranged to the low temperature recovery intracavity, and are provided with the exhanst gas outlet on the low temperature recovery chamber lateral wall of lower floor low temperature heat exchanger tube bank downside, and exhanst gas outlet end. The system can reasonably recycle the waste heat in the flue gas and can ensure the long-term stable operation of the equipment.
Description
Technical Field
The utility model belongs to the technical field of the steelmaking, concretely relates to steel mill's flue gas waste heat utilization system.
Background
A large amount of high-temperature dust-containing flue gas can be generated in the electric furnace steelmaking process, and the sensible heat of the flue gas accounts for more than 10% of the total energy consumption of the electric furnace steelmaking. At present, the domestic flue gas cooling mode is mainly a water cooling mode, namely, a primary flue gas water-cooling elbow, a water-cooling sliding sleeve, a water-cooling flue and a combustion settling chamber which are produced by smelting are cooled, then cooled to 350 ℃ by an air cooler or a spray cooling tower, and finally mixed with secondary waste gas from a large closed cover and a roof dust hood, wherein the temperature of the mixed waste gas is lower than 130 ℃, purified by a dust remover and discharged to the atmosphere by a fan. The mode realizes the purpose of cooling and dedusting the flue gas, but has the defects that a large amount of electric energy and water are consumed on the one hand, and the heat of a large amount of high-temperature flue gas is not recycled on the other hand. To above current situation and problem, in order to realize energy-saving and high-efficient of steelmaking, most steel mills all set up corresponding waste heat recovery device and absorb the flue gas waste heat in the steelmaking process at the in-process of steelmaking, in the prior art, waste heat recovery device mainly includes flue formula waste heat recovery boiler, air heater and economizer etc. and such waste heat recovery device has following not enough at the in-process that uses: firstly, directly adopt the light pipe bundle to carry out the heat transfer in the flue, its heat transfer is inefficient, and the equipment is bulky, and secondly the temperature of flue gas is higher, appears the high temperature corrosion easily, and conventional waste heat recovery device hardly realizes the control to the exit temperature of flue gas, causes the excessive waste of heat energy easily, can not the pertinence carry out effectual utilization to the heat after retrieving. Therefore, it is an objective need to develop a flue gas waste heat utilization system of a steel plant, which has a compact structure, is easy to implement, can reasonably recycle the waste heat in the flue gas, and can ensure the long-term stable operation of equipment.
Disclosure of Invention
An object of the utility model is to provide a compact structure, realize easily, can carry out reasonable recycle, can guarantee the flue gas waste heat utilization system of steel mill of equipment long-term steady operation again to the waste heat in the flue gas.
The utility model aims at realizing the method, which comprises an electric furnace and an exhaust pipe arranged at the top of the electric furnace, wherein the exhaust pipe is L-shaped, the end part of the exhaust pipe is connected with a heat accumulator, an ash blocking plate and a pore plate are sequentially arranged in the heat accumulator above the exhaust pipe from bottom to top, the ash blocking plates are multiple, the ash blocking plates are arranged in the heat accumulator in a staggered manner, a smoke outlet pipe is arranged on the heat accumulator above the pore plate, a three-way valve is arranged at the end part of the smoke outlet pipe, one outlet of the three-way valve is communicated with the air inlet of a scrap iron preheater, and the other outlet of the three-way valve is connected with the smoke; a partition board is vertically installed in the waste heat recoverer, a lower smoke inlet is arranged at the lower end of the partition board, an upper smoke inlet is arranged at the upper end of the partition board, smoke regulating valves are installed on the upper smoke inlet and the lower smoke inlet respectively, the partition board divides the inner cavity of the waste heat recoverer into a high-temperature recovery cavity and a low-temperature recovery cavity, ash discharge pipes are installed at the bottoms of the high-temperature recovery cavity and the low-temperature recovery cavity respectively, a smoke inlet is arranged at the lower side of the high-temperature recovery cavity, a high-temperature heat exchange pipe bundle is installed in the high-temperature recovery cavity, an air filter is installed on an air inlet pipe of the high-temperature heat exchange pipe bundle, an overheat steam generator is installed on an air outlet pipe of the high-temperature heat exchange pipe bundle, a steam turbine is connected with an air outlet of the overheat, the cold water tank and the hot water tank are arranged outside the waste heat recoverer, a flue gas outlet is formed in the side wall of the low-temperature recovery cavity on the lower side of the lowest-layer low-temperature heat exchange tube bundle, and a dust remover is connected to the end portion of the flue gas outlet.
Further, the air outlet of the scrap iron preheater is communicated with the top of the low-temperature recovery cavity.
Further, the top in high temperature recovery chamber and low temperature recovery chamber is provided with deashing mechanism, deashing mechanism includes jetting pipe, air force (forcing) pump and compressed air storage tank, the top in high temperature recovery chamber and low temperature recovery chamber is fixed to the jetting pipe, a plurality of air nozzles are installed to the bottom of jetting pipe, the compressed air storage tank sets up the outside at waste heat recoverer, communicate through the air force (forcing) pump between jetting pipe and the compressed air storage tank.
Further, high temperature heat exchanger tube bank includes upper heat collecting tray and lower heat collecting tray that the interval set up from top to bottom, and upper heat collecting tray and lower heat collecting tray are inside hollow disc, install many straight tubes between upper heat collecting tray and the lower heat collecting tray, all be provided with a plurality of fins on the outer wall of every straight tube, the intake pipe sets up on upper heat collecting tray, the outlet duct sets up on lower heat collecting tray.
Furthermore, the low-temperature heat exchange tube bundle is a serpentine light tube bundle arranged in multiple rows.
Further, air cleaner includes hollow box, install the filter screen in the box, install ultraviolet lamp in the box of filter screen one side, install the motor in the box of filter screen opposite side, install the flabellum on the output shaft of motor.
Furthermore, an inverted cone-shaped smoke blocking cover is arranged at the inlet of the smoke exhaust pipe.
Compared with the prior art, the utility model has the advantages of: firstly, the arranged heat accumulator can be used for carrying out centralized collection on high-temperature flue gas generated in the electric furnace steel making process, in the collecting process, the ash baffle and the pore plate can be used for carrying out primary dust removal on the high-temperature flue gas, one part of the collected high-temperature flue gas is used for preheating scrap iron, and the other part of the collected high-temperature flue gas is used for efficiently recovering waste heat through the waste heat recoverer; secondly, the structural design of the waste heat recoverer is reasonable, the high-temperature recovery cavity and the low-temperature recovery cavity which are arranged can realize waste heat recovery of flue gas stage by stage, the recovered heat can be utilized effectively in a targeted mode, meanwhile, the running states of the high-temperature heat exchange tube bundle and the low-temperature heat exchange tube bundle can be reasonably regulated and controlled through the flue gas regulating valves on the upper smoke inlet and the lower smoke inlet, the high-efficiency recovery and reutilization of flue gas waste heat can be realized to the maximum extent, and therefore the energy-saving and efficiency-increasing result is achieved. The system can reasonably recycle the waste heat in the flue gas, can ensure the long-term stable operation of the equipment, can generate better economic benefit, and is easy to popularize and use.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a high temperature heat exchange tube bundle 26;
in the figure: 1-an electric furnace, 2-a smoke baffle hood, 3-a smoke exhaust pipe, 4-an ash baffle plate, 5-a pore plate, 6-a heat accumulator, 7-an air filter, 71-a fan blade, 72-an ultraviolet lamp, 73-a filter screen, 8-a scrap iron preheater, 9-an injection pipe, 10-an upper smoke inlet, 11-an air pressure pump, 12-a compressed air storage tank, 13-a hot water tank, 14-a cold water tank, 15-a dust remover, 16-a low-temperature heat exchange tube bundle, 17-a smoke outlet, 18-a low-temperature recovery cavity, 19-a partition plate, 20-a lower smoke inlet, 21-an ash exhaust pipe, 22-a high-temperature recovery cavity, 23-a smoke inlet, 24-an overheat steam generator, 25-a steam turbine, 26-a high-temperature heat exchange tube bundle, 261-a lower heat collecting, 262-straight tube, 263-fin, 264-upper heat collecting disc.
Detailed Description
The following further describes the present invention with reference to the attached drawings, but the present invention is not limited in any way, and any changes or improvements based on the teaching of the present invention all belong to the protection scope of the present invention.
As shown in figures 1-2, the utility model comprises an electric furnace 1 and a smoke exhaust pipe 3 installed on the top of the electric furnace 1, wherein the smoke exhaust pipe 3 is L-shaped, large particle dust in the smoke is prevented from entering a heat accumulator 6, the end part of the smoke exhaust pipe 3 is connected with a heat accumulator 6, the smoke exhausted from the smoke exhaust pipe 3 can be collected and concentrated by the heat accumulator 6, the heat accumulator 6 adopts bricks to be stacked, a heat insulation layer is arranged on the outer side of the bricks, a heat insulation layer is arranged on the inner side, an ash baffle 4 and a pore plate 5 are sequentially arranged in the heat accumulator 6 above the smoke exhaust pipe 3 from bottom to top, the ash baffle 4 is a plurality of blocks, the ash baffle 4 is arranged in the heat accumulator 6 in a staggered way, the ash baffle 4 and the pore plate 5 can be used for preliminary dust removal of high temperature smoke, a smoke outlet pipe is arranged on the heat accumulator 6 above the pore plate 5, a three, one outlet of the three-way valve is communicated with an air inlet of the scrap iron preheater 8, and the other outlet of the three-way valve is connected with a flue gas inlet 23 of the waste heat recoverer;
a partition plate 19 is vertically installed in the waste heat recoverer, a lower smoke inlet 20 is arranged at the lower end of the partition plate 19, an upper smoke inlet 10 is arranged at the upper end of the partition plate 19, smoke regulating valves are installed on the upper smoke inlet 10 and the lower smoke inlet 20, the inner cavity of the waste heat recoverer is divided into a high-temperature recovery cavity 22 and a low-temperature recovery cavity 18 by the partition plate 19, ash discharge pipes 21 are installed at the bottoms of the high-temperature recovery cavity 22 and the low-temperature recovery cavity 18, a smoke inlet 23 is arranged at the lower side of the high-temperature recovery cavity 22, a high-temperature heat exchange pipe bundle 26 is installed in the high-temperature recovery cavity 22, an air filter 7 is installed on an air inlet pipe of the high-temperature heat exchange pipe bundle 26, an superheated steam generator 24 is installed on an air outlet pipe of the high-temperature heat exchange pipe bundle 26, a steam turbine 25 is, the water inlet of each low-temperature heat exchange tube bundle 16 is communicated with the cold water tank 14, the water outlet of each low-temperature heat exchange tube bundle 16 is communicated with the hot water tank 13, the cold water tank 14 and the hot water tank 13 are arranged outside the waste heat recoverer, a flue gas outlet 17 is formed in the side wall of a low-temperature recovery cavity 18 on the lower side of the lowest-layer low-temperature heat exchange tube bundle 16, and the end of the flue gas outlet 17 is connected with a dust remover 15.
The working process of the system is as follows: high-temperature flue gas generated in the electric furnace smelting process enters the heat accumulator 6, after primary dust removal of the heat accumulator 6, a part of high-temperature flue gas in the heat accumulator 6 enters the scrap iron preheater 8 to preheat scrap iron, a part of high-temperature flue gas enters the high-temperature recovery cavity 22 through the flue gas inlet 23 to exchange heat with the high-temperature heat exchange tube bundle 26, high-temperature steam generated after heat exchange enters the superheated steam generator 24, saturated steam generated by the superheated steam generator 24 enters the steam turbine 25 to generate power, flue gas subjected to high-temperature heat exchange and temperature reduction enters the low-temperature recovery cavity 18 through the upper smoke inlet 10 to exchange heat with the plurality of low-temperature heat exchange tube bundles 16 in the low-temperature recovery cavity 18, cold water in the low-temperature heat exchange tube bundles 16 is heated respectively, and a part of high-temperature flue gas which is not subjected to heat exchange directly enters the low-temperature recovery cavity 18 through the lower smoke inlet, mix with the low temperature flue gas, in order to maintain the flue gas temperature stability of exhanst gas outlet 17, the high temperature recovery chamber 22 and the low temperature recovery chamber 18 that set up can be staged realize the waste heat recovery of flue gas, can be targeted carry out effectual utilization to the heat after retrieving, simultaneously through last inlet flue 10 and the flue gas governing valve on the lower inlet flue 20 can be reasonable regulate and control the running state of high temperature heat exchanger tube bank 26 and low temperature heat exchanger tube bank 16, the high-efficient recovery of the at utmost realization flue gas waste heat is recycled, thereby reach energy-conserving increase result.
For the further utilization ratio of heat energy that improves, the gas outlet of scrap iron pre-heater 8 and the top intercommunication in low temperature recovery chamber 18, the flue gas after the second grade cooling passes through exhanst gas outlet 17 and gets into dust remover 15 and carry out subsequent dust removal processing, and also gets into low temperature recovery chamber 18 through the flue gas of scrap iron preheating cooling, carries out the secondary cooling through low temperature heat exchanger tube bank 16 and handles.
In order to prevent dust accumulated on the high temperature heat exchange tube bundle 26 and the low temperature heat exchange tube bundle 16 from affecting the heat exchange effect thereof, the top parts of the high-temperature recovery cavity 22 and the low-temperature recovery cavity 18 are provided with ash cleaning mechanisms, the ash cleaning mechanisms comprise injection pipes 9, air pressure pumps 11 and compressed air storage tanks 12, the blowing pipe 9 is fixed on the top of the high-temperature recovery cavity 22 and the low-temperature recovery cavity 18, a plurality of air nozzles are arranged on the bottom of the blowing pipe 9, the compressed air storage tank 12 is arranged outside the waste heat recoverer, the blowing pipe 9 is communicated with the compressed air storage tank 12 through an air pressurizing pump 11, after the compressed air storage tank is used for a period of time, and starting the air pressure pump 11, pumping compressed air in the compressed air storage tank 12 into the blowing pipe 9 by the air pressure pump 11, and cleaning accumulated dust on the high-temperature heat exchange tube bundle 26 and the low-temperature heat exchange tube bundle 16 by using the air nozzle to ensure the heat exchange effect of the high-temperature heat exchange tube bundle 26 and the low-temperature heat exchange tube bundle 16.
Further, high temperature heat exchange tube bundle 26 includes upper heat collection dish 264 and lower heat collection dish 261 that the interval set up from top to bottom, and upper heat collection dish 264 and lower heat collection dish 261 are inside hollow disc, install many straight tubes 262 between upper heat collection dish 264 and the lower heat collection dish 261, all be provided with a plurality of fins 263 on the outer wall of every straight tube 262, the intake pipe sets up on upper heat collection dish 264, the outlet duct sets up on lower heat collection dish 261, and cold air gets into from upper heat collection dish 264, carries out countercurrent exchange with the high temperature flue gas that gets into from flue gas inlet 23, is favorable to realizing good heat transfer effect like this.
Preferably, the low-temperature heat exchange tube bundle 16 is a serpentine light tube bundle arranged in multiple rows, and such arrangement facilitates ash removal on one hand and can reduce the weight of the arrangement on the premise of ensuring the heat exchange area on the other hand.
Further, air cleaner 7 includes hollow box, install filter screen 73 in the box, install ultraviolet lamp 72 in the box of filter screen 73 one side, install the motor in the box of filter screen 73 opposite side, install flabellum 71 on the output shaft of motor, air cleaner can carry out filtration treatment to the air, avoids in the dust that mix with gets into high temperature heat exchanger tube bank 26 in the air, influences the heat transfer effect.
In order to further avoid that dust in the high-temperature flue gas enters the heat accumulator 6 and influences the heat recovery rate of a subsequent device, the inverted-cone-shaped smoke blocking hood 2 is installed at the inlet of the smoke exhaust pipe 3.
Claims (7)
1. The utility model provides a steel mill's flue gas waste heat utilization system, includes electric stove (1) and installs tub (3) of discharging fume at electric stove (1) top, its characterized in that: the waste iron recycling device is characterized in that the smoke exhaust pipe (3) is L-shaped, the end part of the smoke exhaust pipe (3) is connected with a heat accumulator (6), an ash blocking plate (4) and a pore plate (5) are sequentially arranged in the heat accumulator (6) above the smoke exhaust pipe (3) from bottom to top, the ash blocking plates (4) are multiple, the ash blocking plates (4) are arranged in the heat accumulator (6) in a staggered mode, a smoke outlet pipe is arranged on the heat accumulator (6) above the pore plate (5), a three-way valve is installed at the end part of the smoke outlet pipe, one outlet of the three-way valve is communicated with an air inlet of a waste iron preheater (8), and the other outlet of the three-way valve is connected with a smoke inlet (23) of the waste;
a partition plate (19) is vertically installed in the waste heat recoverer, a lower smoke inlet (20) is arranged at the lower end of the partition plate (19), an upper smoke inlet (10) is arranged at the upper end of the partition plate (19), smoke regulating valves are installed on the upper smoke inlet (10) and the lower smoke inlet (20), the partition plate (19) separates the inner cavity of the waste heat recoverer into a high-temperature recovery cavity (22) and a low-temperature recovery cavity (18), ash discharge pipes (21) are installed at the bottoms of the high-temperature recovery cavity (22) and the low-temperature recovery cavity (18), a smoke inlet (23) is arranged at the lower side of the high-temperature recovery cavity (22), a high-temperature heat exchange tube bundle (26) is installed in the high-temperature recovery cavity (22), an air filter (7) is installed on an air inlet pipe of the high-temperature heat exchange tube bundle (26), and an overheated steam generator (24), the gas outlet of superheated steam generator (24) is connected with steam turbine (25), a plurality of low temperature heat exchanger tube bundles (16) have been arranged in low temperature recovery chamber (18), the water inlet of every low temperature heat exchanger tube bundle (16) all communicates with cold water storage cistern (14), the delivery port of every low temperature heat exchanger tube bundle (16) all communicates with hot-water tank (13), cold water storage cistern (14) and hot-water tank (13) set up in waste heat recovery device's outside, and are provided with exhanst gas outlet (17) on low temperature recovery chamber (18) lateral wall of lower floor low temperature heat exchanger tube bundle (16) downside, exhanst gas outlet (17) end connection has dust remover (15).
2. The steel mill flue gas waste heat utilization system according to claim 1, characterized in that: and the air outlet of the scrap iron preheater (8) is communicated with the top of the low-temperature recovery cavity (18).
3. The steel mill flue gas waste heat utilization system according to claim 1, characterized in that: the top in high temperature recovery chamber (22) and low temperature recovery chamber (18) is provided with the deashing mechanism, the deashing mechanism is including jetting pipe (9), air force (forcing) pump (11) and compressed air storage tank (12), the top in high temperature recovery chamber (22) and low temperature recovery chamber (18) is fixed in jetting pipe (9), a plurality of air nozzles are installed to the bottom of jetting pipe (9), compressed air storage tank (12) set up the outside at waste heat recovery ware, communicate through air force (forcing) pump (11) between jetting pipe (9) and compressed air storage tank (12).
4. The steel mill flue gas waste heat utilization system according to claim 1, characterized in that: high temperature heat exchange tube bank (26) are including last heat collection dish (264) and lower heat collection dish (261) that the interval set up from top to bottom, go up heat collection dish (264) and lower heat collection dish (261) be inside hollow disc, install many straight tubes (262) between last heat collection dish (264) and lower heat collection dish (261), all be provided with a plurality of fins (263) on the outer wall of every straight tube (262), the intake pipe sets up on last heat collection dish (264), the outlet duct sets up on lower heat collection dish (261).
5. The steel mill flue gas waste heat utilization system according to claim 1, characterized in that: the low-temperature heat exchange tube bundle (16) is a serpentine light tube bundle arranged in multiple rows.
6. The steel mill flue gas waste heat utilization system according to claim 1, characterized in that: air cleaner (7) are including hollow box, install filter screen (73) in the box, install ultraviolet lamp (72) in the box of filter screen (73) one side, install motor in the box of filter screen (73) opposite side, install flabellum (71) on the output shaft of motor.
7. The steel mill flue gas waste heat utilization system according to claim 1, characterized in that: and an inverted cone-shaped smoke blocking cover (2) is arranged at the inlet of the smoke exhaust pipe (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921633124.8U CN210570060U (en) | 2019-09-28 | 2019-09-28 | Flue gas waste heat utilization system of steel plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921633124.8U CN210570060U (en) | 2019-09-28 | 2019-09-28 | Flue gas waste heat utilization system of steel plant |
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| CN210570060U true CN210570060U (en) | 2020-05-19 |
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| CN201921633124.8U Active CN210570060U (en) | 2019-09-28 | 2019-09-28 | Flue gas waste heat utilization system of steel plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112091203A (en) * | 2020-09-25 | 2020-12-18 | 河北煜剑节能技术有限公司 | Roast package waste heat utilization equipment |
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2019
- 2019-09-28 CN CN201921633124.8U patent/CN210570060U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112091203A (en) * | 2020-09-25 | 2020-12-18 | 河北煜剑节能技术有限公司 | Roast package waste heat utilization equipment |
| CN112091203B (en) * | 2020-09-25 | 2021-10-08 | 河北煜剑节能技术有限公司 | Roast package waste heat utilization equipment |
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