CN212389401U - Waste heat recovery system for sintering process - Google Patents
Waste heat recovery system for sintering process Download PDFInfo
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- CN212389401U CN212389401U CN202021597701.5U CN202021597701U CN212389401U CN 212389401 U CN212389401 U CN 212389401U CN 202021597701 U CN202021597701 U CN 202021597701U CN 212389401 U CN212389401 U CN 212389401U
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- waste heat
- sintering
- steam turbine
- energy
- motor
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- 238000005245 sintering Methods 0.000 title claims abstract description 88
- 239000002918 waste heat Substances 0.000 title claims abstract description 58
- 238000011084 recovery Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010248 power generation Methods 0.000 claims abstract description 9
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000004134 energy conservation Methods 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The utility model discloses a waste heat recovery system for sintering process, include: the system comprises a steam turbine, a waste heat boiler, a sintering fan, a motor and a four-quadrant frequency converter, wherein the waste heat boiler is used for converting sensible heat energy of sintering ores into steam energy and supplying the steam energy to the steam turbine; the four-quadrant inverter provides the motor with: the driving state when the torque output by the steam turbine is smaller than the load torque of the sintering fan, and the power generation state when the torque output by the steam turbine is larger than the load torque of the sintering fan; the four-quadrant frequency converter can feed back the electric energy generated by the motor to the power grid. Above-mentioned a waste heat recovery system for sintering process converts the sintering deposit sensible heat into kinetic energy direct drive sintering fan operation, has reduced the energy of loss, and can convert the unnecessary kinetic energy of steam turbine output into the electric energy and repay to the electric wire netting, can supply other consumer to use, has improved waste heat recovery's efficiency.
Description
Technical Field
The utility model relates to a sintering technology technical field, more specifically say, relate to a waste heat recovery system for sintering technology.
Background
At present, the energy consumption of the steel industry in China accounts for 16.3 percent of the total energy consumption of the country, the energy consumption sources of the steel industry mainly comprise two working sections of sintering and ironmaking, wherein the sintering working section accounts for 10 to 20 percent and is only 70 percent of the ironmaking working section, so that the optimization of a sintering process and a power equipment system to realize energy conservation and emission reduction is particularly important.
In order to realize energy saving, waste heat needs to be recovered. The waste heat recovery of the traditional sintering process mainly utilizes a waste heat generator set to generate electricity, and the generated electric energy is used for supplying the electric motor, so that the electric motor drives a sintering fan to operate to realize air supply. Specifically, the waste heat generating set mainly includes: the system comprises a waste heat boiler, a waste heat steam turbine and a waste heat generator. And 3-5 smoke boxes at the downstream of the sintering fan and a first smoke hood of the cooler are used for generating steam through a waste heat boiler and then driving a generator to generate power through a waste heat turbine.
Above-mentioned waste heat recovery's mode needs to adopt steam power generation earlier, turns into mechanical energy with the electric energy again, including two conversion processes, energy loss is more, leads to waste heat recovery's efficiency lower.
In addition, the unit formed by the motor and the sintering fan and the waste heat generator unit are two independent units and are arranged in different plants, so that the number of required plants is large, and the cost is high.
In summary, how to recover the waste heat of the sintering process to improve the recovery efficiency is a problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a waste heat recovery system for sintering process to improve recovery efficiency.
In order to achieve the above object, the present invention provides the following technical solutions:
a waste heat recovery system for a sintering process, comprising: the system comprises a steam turbine, a waste heat boiler, a sintering fan, a motor and a four-quadrant frequency converter, wherein the waste heat boiler is used for converting sensible heat energy of sintered ores into steam energy and supplying the steam energy to the steam turbine;
wherein the four-quadrant inverter provides the motor with: the driving state when the torque output by the steam turbine is smaller than the load torque of the sintering fan, and the power generation state when the torque output by the steam turbine is larger than the load torque of the sintering fan; the four-quadrant frequency converter can feed back electric energy generated by the motor to the power grid.
Preferably, the sintering fan is connected with the steam turbine through a clutch.
Preferably, the motor and the sintering fan, the sintering fan and the clutch, and the clutch and the steam turbine are all connected through a coupler.
Preferably, the four-quadrant frequency converter can convert the electric energy generated by the motor into electric energy with the same frequency and phase as the power grid.
Preferably, a switch for controlling the on-off of the line is arranged on the line connecting the motor and the four-quadrant frequency converter.
Preferably, the waste heat boiler is a circular cooler waste heat boiler.
The utility model provides a waste heat recovery system for sintering process utilizes exhaust-heat boiler to convert the demonstration heat of sintering deposit into vapour energy and provide the steam turbine, and the steam turbine converts vapour energy into kinetic energy and directly provides sintering fan, compares with prior art, has saved the generator, converts sintering deposit sensible heat into kinetic energy and directly drives sintering fan operation, has simplified the energy conversion process, has reduced the energy of loss, has effectively improved waste heat recovery's efficiency; moreover, when the torque output by the steam turbine is smaller than the load torque of the sintering fan, the motor is in a driving state, and the steam turbine and the motor drive the sintering fan to operate to a set rotating speed together, so that the load of the motor is effectively reduced, and energy conservation is realized; meanwhile, when the kinetic energy output by the steam turbine is larger than the kinetic energy required by the sintering fan, the motor operates in a power generation state to convert the redundant kinetic energy output by the steam turbine into electric energy and feed the electric energy back to the power grid, so that the electric energy can be used by other electric equipment, the waste heat recovery efficiency is further improved, and the energy conservation is realized.
And simultaneously, the utility model provides an each equipment that is used for waste heat recovery system of sintering process to include all can place at same factory building, has reduced the factory building figure, has reduced the input of goods and materials such as equipment, factory building to the cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a waste heat recovery system for a sintering process according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, the waste heat recovery system for sintering process provided by the embodiment of the present invention includes: the system comprises a waste heat boiler, a steam turbine, a sintering fan, a motor and a four-quadrant frequency converter.
The sintering fan is used for exhausting air in the flue to generate negative pressure, so that solid fuel in the sintering material is fully combusted.
The waste heat boiler is used for converting sensible heat energy of the sintering ore into steam energy and providing the steam energy to the steam turbine; the steam turbine is configured to convert the steam energy into kinetic energy, and specifically, the steam turbine is configured to convert the steam energy into kinetic energy of rotation of a shaft; the sintering fan is in transmission connection with the steam turbine, so that kinetic energy generated by the steam turbine can be transmitted to the sintering fan, and the steam turbine drives the sintering fan; the motor is in transmission connection with the sintering fan, and when the motor is in a driving state, the motor drives the sintering fan to operate. The four-quadrant frequency converter is connected with a power grid and a motor.
The four-quadrant frequency converter is arranged between the motor and the power grid and has the capability of feeding energy back to the power grid. The four-quadrant frequency converter can control the motor to operate in a driving state and can also control the motor to operate in a power generation state, and the electric energy meeting the electric energy quality requirement of the power grid is directly fed back to the power grid. This is the self-action of the four-quadrant frequency converter, and therefore, the specific structure of the four-quadrant frequency converter is not described or limited in this embodiment.
Specifically, the four-quadrant inverter makes the motor have: the driving state when the torque output by the steam turbine is smaller than the load torque of the sintering fan, and the power generation state when the torque output by the steam turbine is larger than the load torque of the sintering fan; the four-quadrant frequency converter can feed back the electric energy generated by the motor to the power grid.
It can be understood that if the torque output by the steam turbine is smaller than the load torque of the sintering fan, the electric motor operates in a driving state, at this time, the electric network supplies power to the electric motor, and the steam turbine and the electric motor jointly drive the sintering fan to operate to a set rotating speed; if the torque output by the steam turbine is larger than the load torque of the sintering fan, the motor operates in a power generation state to convert the redundant kinetic energy output by the steam turbine into electric energy and feed the electric energy back to the power grid.
It can be understood that the load torque of the sintering fan is the torque required by the sintering fan when the sintering fan operates at the set rotating speed. The redundant kinetic energy output by the steam turbine is the residual kinetic energy obtained by subtracting the kinetic energy required by the steam turbine to drive the sintering fan to operate from the kinetic energy output by the steam turbine.
The sintering fan is in transmission connection with the steam turbine, kinetic energy generated by the steam turbine can be transmitted to the sintering fan, so that the steam turbine drives the sintering fan, a generator is not needed, energy recovered by sintering waste heat is directly used as rotary mechanical energy to be supplemented on a shaft system, the sintering fan is driven coaxially with the motor, and the motor only needs to output the energy difference between the operation energy consumption of the sintering fan and the work done by the steam turbine, so that the operation current of the motor is reduced, the current of the motor is reduced on line, and energy conservation is realized.
The embodiment of the utility model provides a waste heat recovery system for sintering process utilizes exhaust-heat boiler to convert the demonstration heat of sintering deposit into vapour energy and provide the steam turbine, and the steam turbine converts vapour energy into kinetic energy and directly provides sintering fan, compares with prior art, has saved the generator, converts sintering deposit sensible heat into kinetic energy and directly drives sintering fan operation, has simplified the energy conversion process, has reduced the energy of loss, has effectively improved waste heat recovery's efficiency; moreover, when the torque output by the steam turbine is smaller than the load torque of the sintering fan, the motor is in a driving state, and the steam turbine and the motor drive the sintering fan to operate to a set rotating speed together, so that the load of the motor is effectively reduced, and energy conservation is realized; meanwhile, when the kinetic energy output by the steam turbine is larger than the kinetic energy required by the sintering fan, the motor operates in a power generation state to convert the redundant kinetic energy output by the steam turbine into electric energy and feed the electric energy back to the power grid, so that the electric energy can be used by other electric equipment, the waste heat recovery efficiency is further improved, and the energy conservation is realized.
And simultaneously, the embodiment of the utility model provides an each equipment that is used for waste heat recovery system of sintering process to include all can place at same factory building, has reduced the factory building figure, has reduced the input of goods and materials such as equipment, factory building to the cost is reduced.
Compared with the traditional waste heat recovery system, the waste heat recovery system for the sintering process improves the energy recovery rate by 6-8%; the waste heat recovery system for the sintering process can recover 60-80% of waste heat energy.
In order to facilitate driving the sintering fan to operate, the sintering fan is connected with the steam turbine through a clutch. Specifically, the clutch is engaged when the output rotation speed of the clutch reaches the engagement rotation speed of the sintering fan.
The type of the clutch is selected according to actual needs, and this embodiment does not limit this.
In order to facilitate connection, the motor is connected with the sintering fan through a coupler, the sintering fan is connected with the clutch through the coupler, and the clutch is connected with the steam turbine through the coupler. The type of the coupling is selected according to actual needs, and this embodiment does not limit this.
In the waste heat recovery system for the sintering process, the four-quadrant frequency converter can convert the electric energy emitted by the motor into the electric energy with the same frequency and the same phase as the power grid. Therefore, the electric energy generated by the motor can be directly sent to the power frequency power grid, the power quality requirement of the power grid is met, and the converted electric energy is conveniently utilized by other equipment.
In order to facilitate maintenance of the power grid and the four-quadrant frequency converter, in the waste heat recovery system for the sintering process, a switch for controlling the on-off of a circuit is arranged on the circuit for connecting the motor and the four-quadrant frequency converter. When the maintenance is needed, the switch can be disconnected, and the connection between the four-quadrant frequency converter and the motor is cut off, so that the maintenance is not needed.
The type of the switch is selected according to actual needs, and this embodiment does not limit this.
The type of the waste heat boiler is selected according to actual needs, for example, the waste heat boiler is a circular cooler waste heat boiler. Of course, the waste heat boiler may be of other types, which is not limited in this embodiment.
The motor may be a synchronous motor or an asynchronous motor, and the specific type of the motor is selected according to actual needs, which is not limited in this embodiment.
The types of the steam turbine and the sintering fan are selected according to actual needs, and this embodiment does not limit this.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A waste heat recovery system for a sintering process, comprising: the system comprises a steam turbine, a waste heat boiler, a sintering fan, a motor and a four-quadrant frequency converter, wherein the waste heat boiler is used for converting sensible heat energy of sintered ores into steam energy and supplying the steam energy to the steam turbine;
wherein the four-quadrant inverter provides the motor with: the driving state when the torque output by the steam turbine is smaller than the load torque of the sintering fan, and the power generation state when the torque output by the steam turbine is larger than the load torque of the sintering fan; the four-quadrant frequency converter can feed back electric energy generated by the motor to the power grid.
2. The heat recovery system of claim 1, wherein the sinter fan is coupled to the steam turbine via a clutch.
3. The heat recovery system of claim 2, wherein the motor and the sintering fan, the sintering fan and the clutch, and the clutch and the steam turbine are all connected by couplings.
4. The waste heat recovery system of claim 1, wherein the four-quadrant frequency converter is capable of converting the electric energy generated by the motor into electric energy having the same frequency and phase as the power grid.
5. The waste heat recovery system of claim 1, wherein a switch for controlling the on/off of a line connecting the motor and the four-quadrant frequency converter is arranged on the line.
6. A waste heat recovery system according to any one of claims 1-5, characterized in that the waste heat boiler is a ring cooler waste heat boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021597701.5U CN212389401U (en) | 2020-08-04 | 2020-08-04 | Waste heat recovery system for sintering process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021597701.5U CN212389401U (en) | 2020-08-04 | 2020-08-04 | Waste heat recovery system for sintering process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212389401U true CN212389401U (en) | 2021-01-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021597701.5U Ceased CN212389401U (en) | 2020-08-04 | 2020-08-04 | Waste heat recovery system for sintering process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212389401U (en) |
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2020
- 2020-08-04 CN CN202021597701.5U patent/CN212389401U/en not_active Ceased
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| IW01 | Full invalidation of patent right | ||
| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20221018 Decision number of declaring invalidation: 58670 Granted publication date: 20210122 |