CN211575904U - 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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- CN211575904U CN211575904U CN201922154011.6U CN201922154011U CN211575904U CN 211575904 U CN211575904 U CN 211575904U CN 201922154011 U CN201922154011 U CN 201922154011U CN 211575904 U CN211575904 U CN 211575904U
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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
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Abstract
The utility model discloses a steel mill's flue gas waste heat utilization system, including steelmaking process waste heat recovery device, continuous casting process waste heat recovery device, steel rolling process waste heat recovery device, the high temperature dust remover, the gas collecting tank, exhaust-heat boiler, heat accumulator and steam-distributing cylinder, the over heater, the steam turbine, the condenser, condensate pump, oxygen-eliminating device and water-feeding pump, be connected with the generator on the steam turbine, the delivery port and the water inlet intercommunication of exhaust-heat boiler of water-feeding pump, the play steam end and the oxygen-eliminating device intercommunication of second play steam pipe, be connected with raw materials preheating device on the pipeline of giving vent to anger of gas collecting tank respectively, coal gas preheating device and air preheating device, the end of giving vent to anger of coal gas blast pipe and air blast pipe is connected with the combustor, the end of giving vent to anger of combustor is connected. The utility model discloses can carry out integrated optimal utilization to the waste heat of each process of steelmaking, exportable continuous stable steam, energy saving and consumption reduction has apparent economic value and social value.
Description
Technical Field
The utility model relates to a steel smelting technical field, concretely relates to steel mill's flue gas waste heat utilization system.
Background
The smelting of steel is carried out at high temperature, can produce a large amount of high temperature flue gas in the steelmaking production process, and high temperature flue gas contains a large amount of waste heat, if do not carry out recycle to these flue gas waste heat, directly discharge it into the air, both can the polluted air, waste the energy again, and along with the development of novel economy, environmental protection and energy saving and consumption reduction are the long-term strategic task of steel mill, consequently, need to carry out recycle to steel mill's flue gas waste heat. The existing flue gas waste heat utilization system is complex in structure and complex in operation, cannot fully recycle the waste heat, and is not beneficial to long-term sustainable development of a steel plant; secondly, the existing flue gas waste heat utilization system usually recovers the flue gas waste heat through a waste heat boiler, but due to the periodicity of smelting, the steam quantity generated by the waste heat boiler also has large fluctuation, the instantaneous steam production in the smelting period can reach hundreds of tons per hour, the steam production in the non-smelting period is close to zero, the fluctuation of steam load is increased, and the continuous and stable output of steam is not facilitated; in addition, because each process of steel making is separated and independent during construction, the waste heat resources in each process lack integration optimization and overall layout, so that the energy is not optimally utilized, and energy loss is caused to a certain extent. Therefore, it is objectively needed to develop a flue gas waste heat utilization system of a steel plant, which can integrate and optimize the waste heat of each process of steel making, can output continuous and stable steam, and can save energy and reduce consumption.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can carry out integrated optimal utilization, exportable continuous stable steam, energy saving and consumption reduction's steel mill's flue gas waste heat utilization system to the waste heat of each process of steelmaking.
The utility model aims at realizing like this, including steelmaking process waste heat recovery device, continuous casting process waste heat recovery device and steel rolling process waste heat recovery device, steelmaking process waste heat recovery device, continuous casting process waste heat recovery device and steel rolling process waste heat recovery device's exhaust port communicates in proper order has the high temperature dust remover, the gas collecting tank, exhaust-heat boiler, heat accumulator and steam-distributing cylinder, be provided with first play steam pipe and second play steam pipe on the steam-distributing cylinder, it has the over heater to communicate in proper order on the first play steam pipe, the steam turbine, the condenser, condensate pump, oxygen-eliminating device and water-feeding pump, be connected with the generator on the steam turbine, the delivery port of water-feeding pump and exhaust-heat boiler's water inlet intercommunication, the play steam end and the oxygen-eliminating device intercommunication of second play steam pipe.
The gas outlet pipeline of the gas collecting tank is provided with an exhaust branch pipe, the exhaust branch pipe is provided with a four-way joint, other three joints of the four-way joint are respectively connected with a raw material preheating device, a gas preheating device and an air preheating device through exhaust branch pipes, the gas preheating device is provided with a first gas exhaust pipe and a second gas exhaust pipe, the air preheating device is provided with a first air exhaust pipe and a second air exhaust pipe, the gas outlet ends of the first gas exhaust pipe and the first air exhaust pipe are connected with a burner, the gas outlet end of the burner is connected with a heat exchanger, and the gas outlet end of the heat exchanger is communicated with the gas inlet end of the superheater.
Furthermore, a water outlet of the heat accumulator is provided with a water outlet pipe, and the water outlet end of the water outlet pipe is communicated with the deaerator.
Furthermore, the water discharge pipe is connected with a heating heat exchange station through a three-way joint.
Furthermore, a steam-water separator is arranged on a pipeline between the heat accumulator and the branch cylinder, and a water outlet of the steam-water separator is communicated with the deaerator.
The utility model discloses carry out unified recovery, remove dust and keep in the gas collecting tank to the high temperature flue gas that produces in each process of steelmaking, the high temperature flue gas that temperature and calorific value are different from each other mixes in the gas collecting tank, provide stable continuous high temperature flue gas for exhaust-heat boiler, the steam that produces among the exhaust-heat boiler enters into the heat accumulator and collects and stores, steam enters into the gas-distributing cylinder afterwards, partly steam gets into the oxygen-eliminating device and participates in the deoxidization, another part steam gets into the steam turbine after the heat ware and drives the generator and generate electricity, exhaust steam that discharges from the steam turbine gets back to the exhaust-heat boiler after condensation and deoxidization, accomplish a steam cycle; secondly, having discharged some steam from the gas collecting tank and being used for preheating the material in making steel each process, for example to the preheating of raw materials in the steelmaking process of making iron, preheating of air and coal gas in the steel rolling process etc. simultaneously the utility model discloses in set up the combustor, air and coal gas after the heating let in the combustor and produce the high temperature flue gas, the high temperature flue gas produces the higher steam of calorific value behind the heat exchanger and lets in the over heater, also can guarantee the normal continuous operation of steam turbine when system steam volume is less or no steam. The utility model discloses can carry out integrated optimal utilization to the waste heat of each process of steelmaking, exportable continuous stable steam, energy saving and consumption reduction has apparent economic value and social value.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
in the figure: 1-a steel-making process waste heat recovery device, 2-a continuous casting process waste heat recovery device, 3-a steel rolling process waste heat recovery device, 4-a high-temperature dust remover, 5-a gas collecting tank, 6-a waste heat boiler, 7-a heat accumulator, 8-a steam separating cylinder, 9-a first steam outlet pipe, 10-a second steam outlet pipe, 11-a superheater, 12-a steam turbine, 13-a steam condenser, 14-a condensate pump, 15-a deaerator, 16-a water feeding pump, 17-a generator, 18-a steam-water separator, 19-an exhaust branch pipe, 20-a four-way joint, 21-an exhaust branch pipe, 22-a raw material preheating device, 23-a gas preheating device, 24-an air preheating device, 25-a first gas exhaust pipe, 26-a second gas exhaust pipe, 27-first air exhaust pipe, 28-second air exhaust pipe, 29-burner, 30-heat exchanger, 31-drain pipe, 32-heating heat exchange station.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited in any way, and any changes or improvements based on the present invention are all within the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a steelmaking process waste heat recovery device 1, continuous casting process waste heat recovery device 2 and steel rolling process waste heat recovery device 3, steelmaking process waste heat recovery device 1, continuous casting process waste heat recovery device 2 and steel rolling process waste heat recovery device 3's exhaust port communicates in proper order has high temperature dust collector 4, gas collecting tank 5, exhaust-heat boiler 6, heat accumulator 7 and steam-distributing cylinder 8, be provided with first play steam pipe 9 and second play steam pipe 10 on the steam-distributing cylinder 8, it has over heater 11 to communicate in proper order on the first play steam pipe 9, steam turbine 12, condenser 13, condensate pump 14, oxygen-eliminating device 15 and feed pump 16, be connected with generator 17 on the steam turbine 12, feed pump 16's delivery port and exhaust-heat boiler 6's water inlet intercommunication, the play steam end and the oxygen-eliminating device 15 intercommunication of second play steam pipe 10.
Steelmaking process waste heat recovery device 1 sets up in the steelmaking process of making iron, and the waste heat that equipment such as steelmaking stove, scum produced in to this process is retrieved, and continuous casting process waste heat recovery device 2 sets up in the continuous casting process, retrieves the heat that distributes out the steel billet in this process, and steel rolling process waste heat recovery device 3 sets up in just rolling process, retrieves the waste heat that equipment such as the steel billet heating furnace in this process produced, and above is main waste heat recovery process, the utility model discloses in can also retrieve the waste heat that produces in other processes, the high temperature flue gas after the collection is sent into high temperature dust collector 4 and is unified the processing in unified the dust removal, lets in gas collection tank 5 again.
An exhaust branch pipe 19 is arranged on an air outlet pipeline of the gas collecting tank 5, a four-way joint 20 is arranged on the exhaust branch pipe 19, other three joints of the four-way joint 20 are respectively connected with a raw material preheating device 22, a coal gas preheating device 23 and an air preheating device 24 through exhaust branch pipes 21, a first coal gas exhaust pipe 25 and a second coal gas exhaust pipe 26 are arranged on the coal gas preheating device 23, a first air exhaust pipe 27 and a second air exhaust pipe 28 are arranged on the air preheating device 24, air outlet ends of the first coal gas exhaust pipe 25 and the first air exhaust pipe 27 are connected with a burner 29, an air outlet end of the burner 29 is connected with a heat exchanger 30, and an air outlet end of the heat exchanger 30 is communicated with an air inlet end of the.
The utility model discloses carry out unified recovery to the high temperature flue gas that produces in each process of steelmaking, remove dust and keep in gas collecting tank 5, the high temperature flue gas that temperature and calorific value are different from each other mixes in gas collecting tank 5, provide stable continuous high temperature flue gas for exhaust-heat boiler 6, the steam that produces in exhaust-heat boiler 6 enters into heat accumulator 7 and collects and stores, steam enters into gas-distributing cylinder 8 afterwards, partly steam gets into oxygen-eliminating device 15 and participates in the deoxidization, another part steam gets into steam turbine 12 after heat exchanger 11 and drives generator 17 and generate electricity, exhaust steam from steam turbine 12 gets back to exhaust-heat boiler 6 after condensation and deoxidization, accomplish a steam cycle; secondly, having discharged some steam from gas collecting tank 5 and being used for preheating the material in the each process of steelmaking, for example to preheating of raw materials in the steelmaking process of making iron, preheating of air and coal gas in the steel rolling process etc. simultaneously the utility model discloses in set up combustor 29, air after the heating and coal gas let in combustor 29 and produce the high temperature flue gas, the higher steam of high temperature flue gas production calorific value behind heat exchanger 30 lets in over heater 11, also can guarantee the normal continuous operation of steam turbine 12 when the steam volume of system is less or no steam. To sum up, the utility model discloses can guarantee that exhaust-heat boiler 6 produces stable continuous steam, ensure the continuous normal operation of steam turbine 12, take unified processing to the waste heat of collecting in each process of steelmaking, realize integrated optimal utilization, it is higher to waste heat utilization ratio, realized steel mill energy saving and consumption reduction's purpose.
The water outlet of the heat accumulator 7 is provided with the water outlet pipe 31, the water outlet end of the water outlet pipe 31 is communicated with the deaerator 15, when the heat accumulator 7 collects and stores steam, a certain amount of water can be generated, the water contains a certain amount of heat, the water is introduced into the deaerator 15 to participate in deaerating operation, and the steam consumption during deaerating operation can be reduced while heat waste is avoided.
The water discharge pipe 31 is connected with a heating heat exchange station 32 through a three-way joint, and water discharged by the heat accumulator 7 is used for heating and warming heating water in the heating heat exchange station 32, so that heating water meeting the use requirement is provided for heating users.
A steam-water separator 18 is arranged on a pipeline between the heat accumulator 7 and the steam distributing cylinder 8, a water outlet of the steam-water separator 18 is communicated with the deaerator 15, the steam-water separator 18 is used for removing moisture in steam to provide dry steam for subsequent processes, meanwhile, the moisture still contains a large amount of heat and is led into the deaerator 15 to participate in deaerating operation, and the steam consumption during deaerating operation can be reduced while heat waste is avoided.
Claims (4)
1. The utility model provides a steel mill's flue gas waste heat utilization system which characterized in that: the device comprises a steelmaking process waste heat recovery device (1), a continuous casting process waste heat recovery device (2) and a steel rolling process waste heat recovery device (3), wherein smoke outlets of the steelmaking process waste heat recovery device (1), the continuous casting process waste heat recovery device (2) and the steel rolling process waste heat recovery device (3) are sequentially communicated with a high-temperature dust collector (4), a gas collecting tank (5), a waste heat boiler (6), a heat accumulator (7) and a steam distributing cylinder (8), a first steam outlet pipe (9) and a second steam outlet pipe (10) are arranged on the steam distributing cylinder (8), the first steam outlet pipe (9) is sequentially communicated with a superheater (11), a steam turbine (12), a condenser (13), a condensate pump (14), a deaerator (15) and a water feed pump (16), the steam turbine (12) is connected with a generator (17), a water outlet of the water feed pump (16) is communicated with a water inlet of the waste heat boiler (6), the steam outlet end of the second steam outlet pipe (10) is communicated with a deaerator (15);
the gas collecting device is characterized in that an exhaust branch pipe (19) is arranged on a gas outlet pipeline of the gas collecting tank (5), a four-way joint (20) is arranged on the exhaust branch pipe (19), other three joints of the four-way joint (20) are respectively connected with a raw material preheating device (22), a coal gas preheating device (23) and an air preheating device (24) through exhaust branch pipes (21), a first coal gas exhaust pipe (25) and a second coal gas exhaust pipe (26) are arranged on the coal gas preheating device (23), a first air exhaust pipe (27) and a second air exhaust pipe (28) are arranged on the air preheating device (24), gas outlet ends of the first coal gas exhaust pipe (25) and the first air exhaust pipe (27) are connected with a burner (29), a gas outlet end of the burner (29) is connected with a heat exchanger (30), and a gas outlet end of the heat exchanger (30) is communicated with a gas inlet.
2. The system for utilizing the waste heat of the flue gas of the steel plant according to claim 1, wherein a water outlet of the heat accumulator (7) is provided with a water outlet pipe (31), and a water outlet end of the water outlet pipe (31) is communicated with the deaerator (15).
3. The system for utilizing the waste heat of the flue gas of the steel plant according to claim 2, wherein the water discharge pipe (31) is connected with a heating heat exchange station (32) through a three-way joint.
4. The system for utilizing the waste heat of the flue gas of the steel plant according to claim 1, wherein a steam-water separator (18) is arranged on a pipeline between the heat accumulator (7) and the steam-distributing cylinder (8), and a water outlet of the steam-water separator (18) is communicated with the deaerator (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922154011.6U CN211575904U (en) | 2019-12-05 | 2019-12-05 | Flue gas waste heat utilization system of steel plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922154011.6U CN211575904U (en) | 2019-12-05 | 2019-12-05 | Flue gas waste heat utilization system of steel plant |
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| Publication Number | Publication Date |
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| CN211575904U true CN211575904U (en) | 2020-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922154011.6U Active CN211575904U (en) | 2019-12-05 | 2019-12-05 | Flue gas waste heat utilization system of steel plant |
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| CN (1) | CN211575904U (en) |
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- 2019-12-05 CN CN201922154011.6U patent/CN211575904U/en active Active
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