CN112901286A - System and method for driving blast furnace blower - Google Patents
System and method for driving blast furnace blower Download PDFInfo
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- CN112901286A CN112901286A CN202110059740.2A CN202110059740A CN112901286A CN 112901286 A CN112901286 A CN 112901286A CN 202110059740 A CN202110059740 A CN 202110059740A CN 112901286 A CN112901286 A CN 112901286A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 96
- 239000002912 waste gas Substances 0.000 claims abstract description 23
- 239000002918 waste heat Substances 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 15
- 239000002699 waste material Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 20
- 230000007246 mechanism Effects 0.000 claims description 19
- 230000008859 change Effects 0.000 claims description 17
- 238000001704 evaporation Methods 0.000 claims description 13
- 230000008020 evaporation Effects 0.000 claims description 13
- 238000009833 condensation Methods 0.000 claims description 12
- 230000005494 condensation Effects 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000003034 coal gas Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
- F01K27/02—Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/62—Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production
Abstract
The first purpose of the invention is to provide a method for driving a blast furnace blower, which is realized on the basis that a gas turbine and an expander are respectively and coaxially connected with the blast furnace blower, and comprises the following steps: in the process of stable operation of the blast furnace, the waste heat of the waste gas of the hot blast furnace drives an expansion machine to do work through organic Rankine cycle, and the waste pressure of the blast furnace gas drives a gas turbine to do work to drive a blast furnace blower to work together. The energy recovery rate is high, and the dependence of the blast furnace blower on external electric energy and steam energy is greatly reduced. A second object of the invention is to propose a system enabling the above-mentioned method of driving a blast furnace blower. A third object of the invention is to propose a method for driving a blast furnace blower using the above system.
Description
Technical Field
The invention relates to the technical field of energy recovery, in particular to a system and a method for driving a blast furnace blower by mixing excess pressure and excess heat.
Background
The steel industry is an industry with dense resources, energy consumption and emission, and is characterized by high energy consumption, high cost and high emission. In the whole process of steel production, the process with the highest energy consumption is a blast furnace ironmaking process, and the energy consumption accounts for more than 50% of that of steel enterprises. The blast furnace blower is a high energy consumption device in a blast furnace ironmaking system, the energy consumption of the blast furnace blower is closely related to a driving mode, and two driving modes, namely an electric driving mode or a steam driving mode, are commonly adopted at present.
In order to improve the utilization rate of energy, the existing blast furnace blower driving modes have three types: the first is that blast furnace gas uses the residual pressure to do work through a turbine, uses the output mechanical energy to generate electricity, and then uses the electric energy to drive a motor to drive a blower to rotate. The mode relates to the upper and lower electric networks of electric energy, the voltage lifting process and the mechanical energy-electric energy-mechanical energy conversion link, and the energy loss is large; in addition, the power generation amount of the mode is not enough to drive the blower alone, and extra power consumption of a power grid is needed. The second is that blast furnace gas uses the residual pressure to do work through a turbine, the turbine is coaxially connected with a blower, and the output mechanical work directly drives the blower to rotate. The mode reduces the energy loss of a mechanical energy-electric energy-mechanical energy conversion link, but still needs additional supplementary power, and generally adopts a mode of parallel driving of the motors. And the third is that steam of a steel mill is used as a power source to drive a turbine to do work, the turbine is coaxially connected with an air blower, and the output mechanical work directly drives the air blower to rotate. By adjusting the steam consumption, the power consumption of the air blower can be met, other additional power sources are not needed, and a large amount of steam heat energy is consumed.
Accordingly, a need exists for a system and method for efficiently driving a blast furnace blower.
Disclosure of Invention
Technical problem to be solved
In view of the problems in the art described above, the present invention is at least partially addressed. Therefore, an object of the present invention is to provide a method for driving a blast furnace blower with high energy recovery rate, which greatly reduces the dependence of the blast furnace blower on external electric energy and steam energy.
A second object of the invention is to propose a system enabling the above-mentioned method of driving a blast furnace blower.
A third object of the invention is to propose a method for driving a blast furnace blower using the above system.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides a method for driving a blast furnace blower, which is realized by respectively coaxially connecting a gas turbine and an expander with the blast furnace blower on the basis of the following steps:
in the process of stable operation of the blast furnace, the waste heat of the waste gas of the hot blast furnace drives the expansion machine to do work through organic Rankine cycle, and the waste pressure of the blast furnace gas drives the gas turbine to do work to drive the blast furnace blower to work together.
The invention also provides a system for driving the blast furnace blower, which comprises the blast furnace blower, a gas turbine and an expander;
the gas turbine is arranged on the first side of the blast furnace blower, a gas inlet of the gas turbine can be communicated with a gas outlet of the blast furnace in a stopping way, and a power output shaft of the gas turbine is connected with a power input shaft of the blast furnace blower through a first clutch;
the expansion machine is arranged on the second side of the blast furnace blower, the air inlet of the expansion machine can be communicated with the steam pipe network in a stopping way, the air outlet of the expansion machine can be communicated with the steam exhaust pipeline in a stopping way, and the first end of the power output shaft of the expansion machine is connected with the power input shaft of the blast furnace blower;
the air inlet of the expansion machine is communicated with the outlet of the evaporation chamber of the evaporator in a stopping way, the inlet of the evaporation chamber of the evaporator is communicated with the liquid outlet of the working medium pump, the liquid inlet of the working medium pump is communicated with the liquid storage tank, the heating chamber of the evaporator is used for introducing waste gas generated by the hot blast stove, the air outlet of the expansion machine is communicated with the inlet of the condensation chamber of the condenser in a stopping way, and the outlet of the condensation chamber of the condenser is communicated with the liquid storage tank.
Further, the gas inlet of the gas turbine is communicated with the gas outlet of the blast furnace through a first three-way reversing valve in a cut-off manner; the air inlet of the expansion machine is communicated with the steam pipe network through a second three-way reversing valve in a cut-off manner, and the air inlet of the expansion machine is also communicated with the outlet of the evaporation chamber of the evaporator through the second three-way reversing valve in a cut-off manner; the air outlet of the expansion machine can be communicated with the steam exhaust pipeline through a third three-way reversing valve, and the air outlet of the expansion machine can be communicated with the inlet of the condensation chamber of the condenser through the third three-way reversing valve.
Further, the gas outlet of the gas turbine is communicated with a gas pipe network.
Further, the first end of the power output shaft of the expansion machine is connected with the power input shaft of the blast furnace blower through a coupling.
Furthermore, the system for driving the blast furnace blower also comprises a first gear speed change mechanism, wherein a power input shaft of the first gear speed change mechanism is connected with the second end of a power output shaft of the expansion machine through a coupler, and the power output shaft of the first gear speed change mechanism is connected with the power input shaft of the working medium pump through a second clutch; and/or the presence of a gas in the gas,
the system for driving the blast furnace blower further comprises a second gear speed change mechanism, a power input shaft of the second gear speed change mechanism is connected with the second end of the power output shaft of the expansion machine through a coupler, and the power output shaft of the second gear speed change mechanism is connected with the power input shaft of the generator through a third clutch.
The invention also provides a method for driving a blast furnace blower, which adopts the system to drive the blast furnace blower and comprises the following steps:
s1, when the blast furnace is started, the first clutch is switched to be in a disconnected state, the air inlet of the expansion machine is communicated with the steam pipe network, the air outlet of the expansion machine is communicated with the exhausted steam pipe, and the expansion machine is driven by steam to do work to drive the blast furnace blower to work;
s2, after the blast furnace is successfully ignited, switching the first clutch to be in a combined state, communicating the gas inlet of the gas turbine with the gas outlet of the blast furnace, driving the expansion machine to do work by steam, and driving the gas turbine to do work by the blast furnace gas excess pressure to drive the blast furnace blower to work together;
and S3, after the blast furnace operates stably, communicating the air inlet of a stop expansion machine with a steam pipe network, communicating the air outlet of the stop expansion machine with a steam exhaust pipeline, communicating the air inlet of the expansion machine with the outlet of an evaporation chamber of an evaporator, communicating the air outlet of the expansion machine with the inlet of a condensation chamber of a condenser, driving the expansion machine to do work by waste heat of waste gas of the hot blast furnace through organic Rankine cycle, and driving a gas turbine to do work by the residual pressure of blast furnace gas to drive a blast furnace blower to work together.
Further, the method of driving the blast furnace blower further comprises:
s4, in the process of stable operation of the blast furnace, switching the second clutch to be in a combined state, and driving an expansion machine to do work by waste heat of waste gas of the hot blast furnace through organic Rankine cycle to drive a working medium pump to work; and/or switching the third clutch to be in a combined state, and driving the expansion machine to do work by waste heat of waste gas of the hot blast stove through organic Rankine cycle to drive the generator to work.
(III) advantageous effects
The invention has the beneficial effects that:
1. according to the device and the method for driving the blast furnace blower, the gas turbine and the expansion machine of the organic Rankine cycle driving system are respectively and coaxially connected with the blast furnace blower in the stable operation stage of the blast furnace, so that the purpose that the blast furnace gas residual pressure resource and the hot blast stove waste gas residual pressure resource are used for driving the blast furnace blower is achieved, the consumption of external electric energy and steam is completely eliminated, the blast scheme that the residual pressure resource is completely utilized and extra energy supply is not needed is achieved, and the energy cost is correspondingly reduced.
2. According to the invention, the coal gas turbine and the expansion machine of the organic Rankine cycle driving system are respectively and coaxially connected with the blast furnace blower, so that the recovered energy is directly supplemented to the shaft system, the loss of energy conversion is avoided, and the system efficiency is improved.
3. The expander is connected with the working medium pump, so that the power consumption of the electrically driven working medium pump in the traditional low-temperature waste heat recycling system is eliminated; the expander is connected with a generator, and clean electric power can be provided outwards. Reduce the corresponding environmental pollution and energy cost.
Drawings
The invention is described with the aid of the following figures:
FIG. 1 is a schematic structural view of a system for driving a blast furnace blower in an embodiment of the present invention;
fig. 2 is a schematic diagram of the driving structure of the generator and the working medium pump in the embodiment of the invention.
[ description of reference ]
1: a blast furnace blower;
21: a gas turbine; 23: a first three-way directional valve; 24: a dust removal device; 25: a pressure relief valve bank; 26: a gas pipe network;
31: an expander; 32: an evaporator; 33: a working medium pump; 34: a liquid storage tank; 35: a hot blast stove; 36: a condenser; 37: a second three-way directional valve; 38: a third three-way reversing valve;
41: a first clutch; 42: a second clutch; 43: a third clutch;
51: a first gear change mechanism; 52: a second gear change mechanism;
6: an electric generator.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
The steel mill has sufficient blast furnace gas residual pressure resources and also has sufficient hot blast furnace waste gas residual heat resources, and if the hot blast furnace waste gas residual heat resources can be used for driving a blast furnace blower, the energy consumption of the high-energy blower can be greatly reduced. The inventor finds that in the stable operation stage of the blast furnace, the coal gas turbine and the expansion machine of the organic Rankine cycle driving system are respectively and coaxially connected with the blast furnace blower to realize that the waste heat resource of the coal gas of the blast furnace and the waste heat resource of the waste gas of the hot blast stove are used for driving the blast furnace blower, the consumption of external electric energy and steam can be completely eliminated, and the mechanical work output by the expansion machine is surplus to the power consumption gaps of the coal gas turbine and the blower.
To this end, the invention proposes a method for driving a blast furnace blower, the method being implemented on the basis that a gas turbine and an expander are respectively coaxially connected with the blast furnace blower, comprising: in the process of stable operation of the blast furnace, the waste heat of the waste gas of the hot blast furnace drives the expansion machine to do work through organic Rankine cycle, and the waste pressure of the blast furnace gas drives the gas turbine to do work to drive the blast furnace blower to work together. The energy recovery rate is high, and the dependence of the blast furnace blower on external electric energy and steam energy is greatly reduced.
In order to realize the method for driving the blast furnace blower, the invention also provides a system for driving the blast furnace blower.
A system for driving a blast furnace blower according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Example 1
Fig. 1 is a schematic configuration diagram of a system for driving a blast furnace blower according to an embodiment of the present invention.
As shown in fig. 1, the system for driving the blast furnace blower includes a blast furnace blower 1, a gas turbine 21, and an expander 31. The gas turbine 21 is arranged on the first side of the blast furnace blower 1, the gas inlet of the gas turbine 21 can be communicated with the gas outlet of the blast furnace, and the power output shaft of the gas turbine 21 is connected with the power input shaft of the blast furnace blower 1 through a first clutch 41; the expansion machine 31 is arranged at the second side of the blast furnace blower 1, the air inlet of the expansion machine 31 can be communicated with a steam pipe network in a stopping way, the air outlet of the expansion machine 31 can be communicated with a steam exhaust pipeline in a stopping way, and the first end of the power output shaft of the expansion machine 31 is connected with the power input shaft of the blast furnace blower 1. The air inlet of the expander 31 is also communicated with the outlet of the evaporation chamber of the evaporator 32 in a cut-off manner, the inlet of the evaporation chamber of the evaporator 32 is communicated with the liquid outlet of the working medium pump 33, the liquid inlet of the working medium pump 33 is communicated with the liquid storage tank 34, the heating chamber of the evaporator 32 is used for introducing waste gas generated by the hot blast stove 35, the air outlet of the expander 31 is also communicated with the inlet of the condensation chamber of the condenser 36 in a cut-off manner, and the outlet of the condensation chamber of the condenser 36 is communicated with the liquid storage.
Specifically, the gas inlet of the gas turbine 21 can be communicated with the gas outlet of the blast furnace through a first three-way reversing valve 23; the air inlet of the expansion machine 31 can be communicated with the steam pipe network through a second three-way reversing valve 37, and the air inlet of the expansion machine 31 can be communicated with the outlet of the evaporation chamber of the evaporator 32 through the second three-way reversing valve 37; the air outlet of the expansion machine 31 can be communicated with a steam exhaust pipeline through a third three-way reversing valve 38, and the air outlet of the expansion machine 31 can be communicated with the inlet of the condensation chamber of the condenser 36 through the third three-way reversing valve 38.
Specifically, the gas inlet of the gas turbine 21 is communicated with the gas outlet of the dust removing device 24 through the first three-way reversing valve 23, and the gas inlet of the dust removing device 24 is communicated with the gas outlet of the blast furnace. Specifically, the air outlet of the dust removing device 24 is also communicated with the air inlet of the pressure reducing valve group 25 through the first three-way reversing valve 23, and the air outlet of the pressure reducing valve group 25 is communicated with the gas pipe network 26.
In particular, the gas outlet of the gas turbine 21 is in communication with a gas pipe network 26. For other gas users.
Specifically, as shown in fig. 2, a first end of a power output shaft of the expander 31 is connected to a power input shaft of the blast furnace blower 1 through a coupling.
Example 2
As in embodiment 1, the system for driving the blast furnace blower further includes a first gear change mechanism 51 and a second gear change mechanism 52, see fig. 2. The power input shaft of the first gear speed change mechanism 51 is connected with the second end of the power output shaft of the expander 31 through a coupler, and the power output shaft of the first gear speed change mechanism 51 is connected with the power input shaft of the working medium pump 33 through the second clutch 42. The power input shaft of the second gear shift mechanism 52 is connected to the second end of the power output shaft of the expander 31 via a coupling, and the power output shaft of the second gear shift mechanism 52 is connected to the power input shaft of the generator 6 via the third clutch 43.
The production data shows that the mechanical work output by the expander is surplus except for the gap of the power consumption of the gas turbine and the blower. Therefore, the expander can be connected with the working medium pump, so that the power consumption of an electrically driven working medium pump in the traditional low-temperature waste heat recycling system is eliminated; the expander can also be connected with a generator to output electric power outwards.
Example 3
Using example 1, the following steps were included:
and step S1, when the blast furnace is started, the first clutch is switched to be in a disconnected state, the air inlet of the expansion machine is communicated with the steam pipe network, the air outlet of the expansion machine is communicated with the exhausted steam pipeline, and the expansion machine is driven to do work by steam to drive the blast furnace blower to work.
And step S2, after the blast furnace is successfully ignited, switching the first clutch to be in a combined state, communicating the gas inlet of the gas turbine with the gas outlet of the blast furnace, driving the expansion machine to do work by steam, and driving the gas turbine to do work by the blast furnace gas excess pressure so as to drive the blast furnace blower to work together.
The pressure relief valve block now serves as a backup bypass during this process. The steam supply is reduced in this stage compared to step S1, the magnitude of the reduction depending on the output of the gas turbine.
And step S3, after the blast furnace runs stably, the air inlet of the stop expansion machine is communicated with the steam pipe network, the air outlet of the stop expansion machine is communicated with the exhausted steam pipe, the air inlet of the expansion machine is communicated with the outlet of the evaporation chamber of the evaporator, the air outlet of the expansion machine is communicated with the inlet of the condensation chamber of the condenser, the expansion machine is driven to do work by waste heat of waste gas of the hot blast furnace through organic Rankine cycle, and the gas turbine is driven to do work by the residual pressure of blast furnace gas, so that the blast furnace blower is driven to work together.
The organic Rankine cycle consists of five major components, namely an evaporator, an expander, a condenser, a liquid storage tank and a working medium pump. The waste heat of the hot blast stove waste gas is used as a heat source to enter an evaporator. In the evaporator, the organic working medium absorbs the heat of the waste gas of the hot blast stove and evaporates into high-temperature and high-pressure working medium steam, and then the expansion machine is pushed to do work to supplement the difference between the power required by the blower and the output power of the gas turbine (namely, the power part provided by the pipe network steam in the previous stage is replaced). After the organic working medium steam pushes the expansion machine to do work, the organic working medium steam is changed into low-temperature low-pressure spent working medium steam. The exhausted working medium steam discharged from the expander passes through the condenser and exchanges heat with a cooling medium (generally water or air) to finish the processes of temperature reduction and cooling, is converted into liquid organic working medium in the condenser and flows into the liquid storage tank. The liquid storage tank is arranged to supplement the part of the organic working medium leaked in the circulation process. Under the action of the circulating working medium pump, the liquid working medium pumped out of the liquid storage tank is pressurized into high-pressure liquid, and then enters the evaporator again. The above processes are circulated to continuously drive the blast furnace blower.
Example 4
Using example 2, the following steps were included:
and step S1, when the blast furnace is started, switching the first clutch, the second clutch and the third clutch to be in a disconnected state, communicating an air inlet of the expansion machine with a steam pipe network, communicating an air outlet of the expansion machine with a steam exhaust pipeline, and driving the expansion machine to do work by steam to drive a blast furnace blower to work.
And step S2, after the blast furnace is successfully ignited, switching the first clutch to be in a combined state, communicating the gas inlet of the gas turbine with the gas outlet of the blast furnace, driving the expansion machine to do work by steam, and driving the gas turbine to do work by the blast furnace gas excess pressure so as to drive the blast furnace blower to work together.
And step S3, after the blast furnace runs stably, the air inlet of the stop expansion machine is communicated with the steam pipe network, the air outlet of the stop expansion machine is communicated with the exhausted steam pipe, the air inlet of the expansion machine is communicated with the outlet of the evaporation chamber of the evaporator, the air outlet of the expansion machine is communicated with the inlet of the condensation chamber of the condenser, the expansion machine is driven to do work by waste heat of waste gas of the hot blast furnace through organic Rankine cycle, and the gas turbine is driven to do work by the residual pressure of blast furnace gas, so that the blast furnace blower is driven to work together.
Step S4, in the process of stable operation of the blast furnace, the second clutch is switched to be in a combined state, and the waste heat of the waste gas of the hot blast stove drives an expansion machine to do work through organic Rankine cycle to drive a working medium pump to work; and switching the third clutch to be in a combined state, and driving the expansion machine to do work by waste heat of waste gas of the hot blast stove through the organic Rankine cycle to drive the generator to work.
It should be understood that the above description of specific embodiments of the present invention is only for the purpose of illustrating the technical lines and features of the present invention, and is intended to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, but the present invention is not limited to the above specific embodiments. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.
Claims (8)
1. A method for driving a blast furnace blower, wherein the method is implemented based on a gas turbine and an expander which are respectively coaxially connected with the blast furnace blower, and comprises the following steps:
in the process of stable operation of the blast furnace, the waste heat of the waste gas of the hot blast furnace drives the expansion machine to do work through organic Rankine cycle, and the waste pressure of the blast furnace gas drives the gas turbine to do work to drive the blast furnace blower to work together.
2. A system for driving a blast furnace blower, comprising a blast furnace blower (1), a gas turbine (21) and an expander (31);
the gas turbine (21) is arranged on the first side of the blast furnace blower (1), the gas inlet of the gas turbine (21) can be communicated with the gas outlet of the blast furnace, and the power output shaft of the gas turbine (21) is connected with the power input shaft of the blast furnace blower (1) through a first clutch (41);
the expansion machine (31) is arranged on the second side of the blast furnace blower (1), the air inlet of the expansion machine (31) can be communicated with the steam pipe network in a cut-off mode, the air outlet of the expansion machine (31) can be communicated with the steam exhaust pipeline in a cut-off mode, and the first end of the power output shaft of the expansion machine (31) is connected with the power input shaft of the blast furnace blower (1);
the air inlet of the expansion machine (31) is communicated with the outlet of the evaporation chamber of the evaporator (32) in a cut-off manner, the inlet of the evaporation chamber of the evaporator (32) is communicated with the liquid outlet of the working medium pump (33), the liquid inlet of the working medium pump (33) is communicated with the liquid storage tank (34), the heating chamber of the evaporator (32) is used for introducing waste gas generated by the hot blast stove (35), the air outlet of the expansion machine (31) is communicated with the inlet of the condensation chamber of the condenser (36) in a cut-off manner, and the outlet of the condensation chamber of the condenser (36) is communicated with the liquid storage tank (34).
3. The system according to claim 2, characterized in that the gas inlet of the gas turbine (21) is in cut-off communication with the gas outlet of the blast furnace through a first three-way reversing valve (23);
the air inlet of the expansion machine (31) can be communicated with the steam pipe network in a stopping way through a second three-way reversing valve (37), and the air inlet of the expansion machine (31) can be communicated with the outlet of the evaporation chamber of the evaporator (32) in a stopping way through the second three-way reversing valve (37);
the air outlet of the expansion machine (31) can be communicated with a steam exhaust pipeline through a third three-way reversing valve (38) in a cut-off mode, and the air outlet of the expansion machine (31) can be communicated with the inlet of a condensing chamber of the condenser (36) through the third three-way reversing valve (38) in a cut-off mode.
4. The system according to claim 2, wherein the gas turbine (21) has an outlet communicating with a gas network (26).
5. A system according to claim 2, characterized in that the first end of the power take-off shaft of the expander (31) is connected to the power take-off shaft of the blast furnace blower (1) by means of a coupling.
6. The system according to claim 2, further comprising a first gear change mechanism (51), wherein a power input shaft of the first gear change mechanism (51) is connected with a second end of a power output shaft of the expansion machine (31) through a coupler, and the power output shaft of the first gear change mechanism (51) is connected with the power input shaft of the working medium pump (33) through a second clutch (42); and/or the presence of a gas in the gas,
the power output shaft of the second gear speed change mechanism (52) is connected with the second end of the power output shaft of the expansion machine (31) through a coupler, and the power output shaft of the second gear speed change mechanism (52) is connected with the power input shaft of the generator (6) through a third clutch (43).
7. A method of driving a blast furnace blower using the system of any one of claims 2 to 6, comprising:
s1, when the blast furnace is started, the first clutch is switched to be in a disconnected state, the air inlet of the expansion machine is communicated with the steam pipe network, the air outlet of the expansion machine is communicated with the exhausted steam pipe, and the expansion machine is driven by steam to do work to drive the blast furnace blower to work;
s2, after the blast furnace is successfully ignited, switching the first clutch to be in a combined state, communicating the gas inlet of the gas turbine with the gas outlet of the blast furnace, driving the expansion machine to do work by steam, and driving the gas turbine to do work by the blast furnace gas excess pressure to drive the blast furnace blower to work together;
and S3, after the blast furnace operates stably, communicating the air inlet of a stop expansion machine with a steam pipe network, communicating the air outlet of the stop expansion machine with a steam exhaust pipeline, communicating the air inlet of the expansion machine with the outlet of an evaporation chamber of an evaporator, communicating the air outlet of the expansion machine with the inlet of a condensation chamber of a condenser, driving the expansion machine to do work by waste heat of waste gas of the hot blast furnace through organic Rankine cycle, and driving a gas turbine to do work by the residual pressure of blast furnace gas to drive a blast furnace blower to work together.
8. The method of claim 7, further comprising:
s4, in the process of stable operation of the blast furnace, switching the second clutch to be in a combined state, and driving an expansion machine to do work by waste heat of waste gas of the hot blast furnace through organic Rankine cycle to drive a working medium pump to work; and/or switching the third clutch to be in a combined state, and driving the expansion machine to do work by waste heat of waste gas of the hot blast stove through organic Rankine cycle to drive the generator to work.
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| JP2012112313A (en) * | 2010-11-25 | 2012-06-14 | Sumitomo Metal Ind Ltd | Air blower and control method of air blower |
| CN103331026A (en) * | 2013-07-15 | 2013-10-02 | 天华化工机械及自动化研究设计院有限公司 | Automatic inertia type spray drying system |
| CN203257697U (en) * | 2013-04-23 | 2013-10-30 | 中冶南方工程技术有限公司 | System enabling blast furnace hot blast stove burnt gas to be used for blast furnace steam blower |
| CN105112577A (en) * | 2015-09-30 | 2015-12-02 | 东北大学 | Dry granulating blast furnace slag waste heat recovery device and blast furnace slag waste heat recovery method |
| CN209012101U (en) * | 2019-04-30 | 2019-06-21 | 西安陕鼓动力股份有限公司 | A kind of blast furnace air energy saver of composite power driving |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012112313A (en) * | 2010-11-25 | 2012-06-14 | Sumitomo Metal Ind Ltd | Air blower and control method of air blower |
| CN203257697U (en) * | 2013-04-23 | 2013-10-30 | 中冶南方工程技术有限公司 | System enabling blast furnace hot blast stove burnt gas to be used for blast furnace steam blower |
| CN103331026A (en) * | 2013-07-15 | 2013-10-02 | 天华化工机械及自动化研究设计院有限公司 | Automatic inertia type spray drying system |
| CN105112577A (en) * | 2015-09-30 | 2015-12-02 | 东北大学 | Dry granulating blast furnace slag waste heat recovery device and blast furnace slag waste heat recovery method |
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Application publication date: 20210604 Assignee: BEIJING HUALUAN TRAFFIC TECHNOLOGY Co.,Ltd. Assignor: Northeastern University Contract record no.: X2024210000008 Denomination of invention: A system and method for driving blast furnace blowers Granted publication date: 20221004 License type: Common License Record date: 20240115 |