CN217900524U - Sintering waste heat power generation system adopting steam reheating - Google Patents
Sintering waste heat power generation system adopting steam reheating Download PDFInfo
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- CN217900524U CN217900524U CN202222038190.9U CN202222038190U CN217900524U CN 217900524 U CN217900524 U CN 217900524U CN 202222038190 U CN202222038190 U CN 202222038190U CN 217900524 U CN217900524 U CN 217900524U
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Abstract
The utility model discloses a steam reheating sintering waste heat power generation system, which comprises a waste heat boiler and a steam turbine, and further comprises a ring cooling machine and a reheater, wherein the ring cooling machine is sequentially provided with a high-temperature section hot waste gas collecting cover, a middle-temperature section hot waste gas collecting cover and a low-temperature section hot waste gas collecting cover; a reheater hot waste gas inlet and an outlet of a high-temperature section hot waste gas collecting cover are connected into a whole, a third flue gas pipeline is arranged between the reheater hot waste gas outlet and a waste heat boiler hot waste gas inlet and connected, a fourth steam pipeline is arranged between a reheater steam outlet and a low-pressure cylinder steam inlet of a steam turbine and connected, a third steam pipeline is arranged between the reheater steam inlet and a high-pressure cylinder steam outlet of the steam turbine and connected, an inlet end of the third steam pipeline is further connected with a second steam pipeline arranged between a low-pressure steam outlet of the waste heat boiler, and a first steam pipeline is arranged between the waste heat boiler high-pressure steam outlet and the high-pressure cylinder steam inlet of the steam turbine and connected.
Description
Technical Field
The utility model relates to a steel industry waste heat recovery utilizes technical field, especially relates to a sintering waste heat power generation system that steam was reheat.
Background
China is a big iron and steel producing country, the sintering waste heat resources are rich, and the recycling of the sintering waste heat is an important way for the iron and steel enterprises to save energy, reduce consumption and reduce carbon emission. The waste heat of the sintering ore is recovered by adopting a sintering ring cooling waste heat power generation mode.
In the process of generating power by using annular cooling waste heat, the annular cooling machine blows air to cool hot sintering ores to form high-temperature, medium-temperature and low-temperature hot waste gas, the high-temperature and medium-temperature hot waste gas is sent to the double-pressure waste heat boiler to generate high-pressure steam and low-pressure steam, the high-pressure steam and the low-pressure steam are sent to the steam supplementing and condensing type steam turbine to generate power, and the generating capacity of each ton of the sintering ores reaches 20kWh. Because the pressure and the temperature of high-pressure steam and low-pressure steam produced by the double-pressure waste heat boiler are lower, the steam temperature at the tail part of the steam turbine is lower and the steam humidity is higher when the high-pressure steam and the low-pressure steam are sent into the steam compensating and condensing steam turbine for power generation, the steam working capacity is low and the power generation efficiency of the steam turbine is low, and further the ton ore power generation capacity of sinter is difficult to improve.
The steam reheating power generation technology improves the steam temperature and the steam dryness in the steam turbine, and further improves the steam work doing capability in the steam turbine and the power generation efficiency of the steam turbine.
SUMMERY OF THE UTILITY MODEL
To the problem that low and the steam humidity of steam temperature leads to the steam turbine generated energy to be difficult to improve in the steam turbine among the sintering waste heat power generation process, the utility model provides a steam reheat's sintering waste heat power generation system improves the temperature and the aridity of steam in the steam turbine through the steam reheat mode, and then improves steam turbine generating efficiency and sinter ton ore generated energy.
The utility model discloses a following technical scheme realizes:
a steam reheating sintering waste heat power generation system comprises a waste heat boiler, a steam turbine, a circular cooler and a reheater; the circular cooler is sequentially provided with a high-temperature section hot waste gas collecting cover, a middle-temperature section hot waste gas collecting cover and a low-temperature section hot waste gas collecting cover; the hot waste gas inlet of the reheater and the outlet of the high-temperature section hot waste gas collecting cover are connected into a whole, a third flue gas pipeline is arranged between the hot waste gas outlet of the reheater and the hot waste gas inlet of the waste heat boiler to be connected, a fourth steam pipeline is arranged between the steam outlet of the reheater and the steam inlet of the low-pressure cylinder of the steam turbine to be connected, a third steam pipeline is arranged between the steam inlet of the reheater and the steam outlet of the high-pressure cylinder of the steam turbine to be connected, the inlet end of the third steam pipeline is connected with a second steam pipeline arranged between the low-pressure steam outlet of the waste heat boiler, and a first steam pipeline is arranged between the high-pressure steam outlet of the waste heat boiler and the steam inlet of the high-pressure cylinder of the steam turbine to be connected.
And furthermore, the device also comprises a sintering machine, wherein a discharge hole of the sintering machine is connected with a feed inlet of the ring cooling machine, and a combustion air inlet of the sintering machine is connected with an outlet of a low-temperature section hot waste gas collecting cover of the ring cooling machine through a second flue gas pipeline.
Furthermore, a fourth flue gas pipeline is arranged between an outlet of the hot waste gas collecting cover at the medium temperature section of the circular cooler and an inlet of the medium temperature hot waste gas of the waste heat boiler for connection.
Furthermore, a high-temperature section air chamber, a middle-temperature section air chamber and a low-temperature section air chamber are arranged on the lower side of the circular cooler, a first flue gas pipeline is arranged between a hot waste gas outlet of the waste heat boiler and cold air inlets of the high-temperature section air chamber and the middle-temperature section air chamber for connection, a circulating fan is arranged on the first flue gas pipeline, and an air blower is arranged at a cold air inlet of the low-temperature section air chamber.
Further, the system also comprises a generator, and the steam turbine is connected with the generator.
Furthermore, the first steam pipeline, the second steam pipeline, the third steam pipeline and the fourth steam pipeline are all provided with heat insulation layers.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the electric energy production of the sinter per ton ore is improved. The reheater is adopted to reheat intermediate steam discharged by a steam turbine and low-pressure steam discharged by a waste heat boiler, the reheated steam produced by the reheater is sent to the steam turbine to generate electricity, the generated energy of the steam turbine is improved by the reheated steam, and further the generated energy of the sinter ore per ton is improved by about 10%.
2. The installation and maintenance of the reheater equipment are convenient. The reheater and the exhaust-heat boiler are separately arranged and are arranged at the top of the hot waste gas collecting cover of the high-temperature section of the circular cooler, the size of the reheater is not limited by the size of the hearth of the exhaust-heat boiler, and the installation and the maintenance are convenient.
3. And (4) utilizing the temperature of the hot waste gas of the circular cooler in a gradient manner. High-temperature hot waste gas discharged by the ring cooling machine is firstly sent to a reheater to be utilized and then sent to a waste heat boiler to be utilized, medium-temperature hot waste gas discharged by the medium-temperature section hot waste gas collecting cover of the ring cooling machine is sent to the waste heat boiler to be utilized, low-temperature hot waste gas discharged by the low-temperature section hot waste gas collecting cover of the ring cooling machine is sent to a sintering machine to be utilized, and the temperature gradient utilization of the hot waste gas of the ring cooling machine is realized.
Drawings
Fig. 1 is a schematic diagram of a sintering waste heat power generation system with steam reheating according to the present invention.
Wherein: 1. sintering machine; 2. a circular cooler; 21. a high temperature section hot exhaust gas collection hood; 22. a circulating fan; 23. a medium-temperature section hot waste gas collecting cover; 24. a blower; 25. a low temperature section hot exhaust gas collection hood; 3. a reheater; 4. a waste heat boiler; 5. a steam turbine; 51. a high-pressure cylinder of the steam turbine; 52. a low-pressure cylinder of the steam turbine; 6. a generator; 7. a first steam line; 8. a second steam line; 9. a water supply pipe; 10. a third steam line; 11. a first flue gas duct; 12. a second flue gas duct; 13. a fourth steam line; 14. a third flue gas duct; 15. and a fourth flue gas duct.
Detailed Description
The following further explains the embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the sintering waste heat power generation system using steam reheating includes a waste heat boiler 4, a steam turbine 5, a circular cooler 2, a reheater 3, a sintering machine 1, and a power generator 6.
And a discharge port of the sintering machine 1 is connected with a feed port of the circular cooler 2.
The ring cooling machine 2 is provided with a high-temperature cooling chamber, a medium-temperature cooling chamber and a low-temperature cooling chamber in sequence, the tops of the high-temperature cooling chamber, the medium-temperature cooling chamber and the low-temperature cooling chamber are correspondingly provided with a high-temperature section hot waste gas collecting cover 21, a medium-temperature section hot waste gas collecting cover 23 and a low-temperature section hot waste gas collecting cover 25, and the bottoms of the high-temperature cooling chamber, the medium-temperature cooling chamber and the low-temperature cooling chamber are correspondingly provided with a high-temperature section air chamber, a medium-temperature section air chamber and a low-temperature section air chamber.
The reheater 3 is installed at the top of the high-temperature section hot waste gas collecting cover 21 and is provided with a sealed heat-insulating shell, and a refractory material heat-insulating layer is arranged inside the sealed heat-insulating shell. The reheater 3 is provided with a reheater hot exhaust gas inlet and a reheater hot exhaust gas outlet, and is also provided with a reheater steam inlet and a reheater steam outlet.
The waste heat boiler 4 is a double-pressure waste heat boiler and is provided with a high-temperature hot waste gas inlet of the waste heat boiler, a medium-temperature hot waste gas inlet of the waste heat boiler, a hot waste gas outlet of the waste heat boiler, a high-pressure steam outlet of the waste heat boiler, a low-pressure steam outlet of the waste heat boiler and a water supply inlet.
The steam turbine 5 is a reheat steam turbine and is formed by serially connecting a high-pressure steam cylinder 51 and a low-pressure steam cylinder 52, the high-pressure steam cylinder 51 is provided with a high-pressure steam inlet and a high-pressure steam outlet, the low-pressure steam cylinder 52 is provided with a low-pressure steam inlet and a low-pressure steam outlet, and the steam turbine 5 is connected with the generator 6.
The hot waste gas inlet of the reheater is connected with the outlet of the hot waste gas collecting cover 21 at the high-temperature section of the circular cooler 2 into a whole; and a third flue gas pipeline 14 is arranged between the reheater hot waste gas outlet and the waste heat boiler high-temperature hot waste gas inlet for connection.
A third steam pipeline 10 is arranged between the steam inlet of the reheater and the steam outlet of the high-pressure cylinder of the steam turbine 5 for connection, and a second steam pipeline 8 is arranged between the inlet end of the third steam pipeline 10 and the low-pressure steam outlet of the waste heat boiler for connection, so that the low-pressure steam is sent to the third steam pipeline 10 through the second steam pipeline 8, mixed with the intermediate steam discharged by the high-pressure cylinder 51 of the steam turbine, and sent to the reheater 3 through the third steam pipeline 10 for reheating; the reheater steam outlet is connected to the low-pressure cylinder steam inlet of the steam turbine 5 by a fourth steam pipe 13, and the reheated steam generated by the reheater 3 is sent to the low-pressure cylinder 52 of the steam turbine 5 to apply work to drive the steam turbine 5.
A fourth flue gas pipeline 15 is arranged between the outlet of the hot waste gas collecting cover 23 at the medium temperature section of the circular cooler 2 and the medium temperature hot waste gas inlet of the waste heat boiler 4 for connecting, and the medium temperature hot waste gas of the circular cooler 2 is sent into the waste heat boiler 4 for producing steam; and a second flue gas pipeline 12 is arranged between the outlet of the low-temperature section hot waste gas collecting cover 25 of the circular cooler 2 and the combustion air inlet of the sintering machine 1 for connection, so that the low-temperature hot waste gas of the circular cooler 2 is sent into the sintering machine 1 for combustion supporting.
A first flue gas pipeline 11 is arranged between the hot waste gas outlet of the waste heat boiler and cold air inlets of the high-temperature section air chamber and the middle-temperature section air chamber of the ring cooling machine 2 for connection, and a circulating fan 22 is arranged on the first flue gas pipeline 11 and used for sending low-temperature hot waste gas discharged by the waste heat boiler 4 into the high-temperature section air chamber and the middle-temperature section air chamber of the ring cooling machine 2 to be used as cooling air of the ring cooling machine 2. And an air blower 24 is arranged in the low-temperature section air chamber of the circular cooler 2 to provide cold air for the circular cooler.
A first steam pipeline 7 is arranged between a high-pressure steam outlet of the waste heat boiler 4 and a high-pressure cylinder steam inlet of the steam turbine 5 for connection, and the high-pressure steam in the waste heat boiler 4 is sent into a high-pressure cylinder 51 of the steam turbine 5 to do work.
A water supply pipeline 9 is arranged between a water supply inlet of the waste heat boiler and a steam outlet of a low-pressure cylinder of the steam turbine 5 and connected with the waste heat boiler, and a condenser, a deaerator water supply pump, a deaerator and a waste heat boiler water supply pump are further arranged on the water supply pipeline 9.
The first steam pipeline 7, the second steam pipeline 8, the third steam pipeline 10, the fourth steam pipeline 13, the first flue gas pipeline 11, the second flue gas pipeline 12, the third flue gas pipeline 14 and the fourth flue gas pipeline 15 are all provided with heat insulation layers.
The working process of the embodiment is as follows:
1. the circular cooler produces hot exhaust gas. Hot sinter produced by the sintering machine 1 is sent into the circular cooler 2 for cooling, cooling air is provided by the circular cooler 2 through the circulating fan 22 and the blower 24, and the circular cooler 2 cools the hot sinter to form circular cooler high-temperature hot waste gas with the temperature of about 400 ℃, circular cooler medium-temperature hot waste gas with the temperature of about 300 ℃ and circular cooler low-temperature hot waste gas with the temperature of about 150 ℃; the high-temperature hot waste gas of the circular cooler is sent into the reheater 3 by the circular cooler high-temperature section hot waste gas collecting cover 21 for heat exchange, the hot waste gas with the temperature of about 360 ℃ discharged by the reheater 3 is sent into the waste heat boiler 4 for heat exchange by the third flue gas pipeline 14, the medium-temperature hot waste gas of the circular cooler discharged by the circular cooler medium-temperature section hot waste gas collecting cover 23 is sent into the waste heat boiler 4 for heat exchange by the fourth flue gas pipeline 15, and the low-temperature hot waste gas of the circular cooler discharged by the circular cooler low-temperature section hot waste gas collecting cover 25 is sent to the sintering machine 1 by the second flue gas pipeline 12 for use as combustion air.
2. The reheater produces reheated steam. The low-pressure steam produced by the waste heat boiler 4 and the intermediate steam exhausted by the high-pressure cylinder 51 of the steam turbine are mixed and then sent to the reheater 3 through the third steam pipeline 10 to be reheated, the reheater 3 absorbs the heat of the high-temperature hot exhaust gas of the circular cooler to produce reheated steam of 0.8MPa/340 ℃, and the reheated steam is sent to the low-pressure cylinder 52 of the steam turbine 5 through the fourth steam pipeline 13 to do work to drive the steam turbine 5.
3. The exhaust-heat boiler produces high-pressure steam and low-pressure steam. The exhaust-heat boiler 4 absorbs the heat of the high-temperature hot exhaust gas discharged from the reheater 3 and the heat of the medium-temperature hot exhaust gas discharged from the medium-temperature hot exhaust gas collecting cover 23 of the ring cooler 2 to produce high-pressure steam of 2.0MPa/340 ℃ and low-pressure steam of 0.8MPa, the high-pressure steam is sent into the high-pressure cylinder 51 of the steam turbine 5 through the first steam pipeline 7 to work to drive the steam turbine 5, the low-pressure steam is sent into the third steam pipeline 10 through the second steam pipeline 8, mixed with the medium steam with the pressure of 0.8MPa discharged from the high-pressure cylinder 51 of the steam turbine and then sent into the reheater 3 through the third steam pipeline 10, and the hot exhaust gas with the temperature of about 130 ℃ discharged from the exhaust-heat boiler 4 is sent into the high-temperature air chamber and the medium-temperature air chamber of the ring cooler 2 through the first flue gas pipeline 11 and the circulating fan 22 to be used as cooling air.
4. And generating power by a steam turbine. High-pressure steam produced by the waste heat boiler 4 is sent to a high-pressure turbine cylinder 51 by a first steam pipeline 7 to drive a turbine 5 to do work, reheated steam produced by a reheater 3 is sent to a low-pressure turbine cylinder 52 by a fourth steam pipeline 13 to drive the turbine 5 to do work, the turbine 5 drives a generator 6 to generate electricity, exhaust steam with the pressure of 0.007MPa discharged by the low-pressure turbine cylinder 52 is sent to a condenser to be cooled into condensed water with the temperature of about 40 ℃, and the condensed water is sent to a deaerator to be deaerated and then sent to the waste heat boiler 4 by a water supply pipeline 9 to be used as waste heat boiler water supply.
Finally, it should be noted that: although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications, equivalents, improvements and the like can be made in the technical solutions of the embodiments or in some technical features of the embodiments, but all modifications, equivalents, improvements and the like within the spirit and principle of the present invention are also within the scope of the present invention.
Claims (6)
1. The sintering waste heat power generation system adopting steam reheating is characterized by comprising a waste heat boiler (4), a steam turbine (5), a ring cooling machine (2) and a reheater (3), wherein the ring cooling machine (2) is sequentially provided with a high-temperature section hot waste gas collecting cover (21), a middle-temperature section hot waste gas collecting cover (23) and a low-temperature section hot waste gas collecting cover (25); a reheater hot waste gas inlet and an outlet of a high-temperature section hot waste gas collecting cover (21) are connected into a whole, a third flue gas pipeline (14) is arranged between the reheater hot waste gas outlet and a waste heat boiler hot waste gas inlet to be connected, a fourth steam pipeline (13) is arranged between the reheater steam outlet and a low-pressure cylinder steam inlet of a steam turbine (5) to be connected, a third steam pipeline (10) is arranged between the reheater steam inlet and a high-pressure cylinder steam outlet of the steam turbine (5) to be connected, a second steam pipeline (8) is arranged between an inlet end of the third steam pipeline (10) and a low-pressure steam outlet of the waste heat boiler to be connected, and a first steam pipeline (7) is arranged between the high-pressure steam outlet of the waste heat boiler and the high-pressure cylinder steam inlet of the steam turbine (5) to be connected.
2. The steam reheating sintering waste heat power generation system as claimed in claim 1, further comprising a sintering machine (1), wherein a discharge outlet of the sintering machine (1) is connected with a feed inlet of the circular cooler (2), and a second flue gas pipeline (12) is arranged between a combustion air inlet of the sintering machine (1) and an outlet of a low-temperature section hot waste gas collecting cover (25) of the circular cooler for connection.
3. The steam reheating sintering waste heat power generation system as claimed in claim 1, wherein a fourth flue gas pipeline (15) is arranged between an outlet of the medium-temperature section hot waste gas collecting cover (23) of the circular cooler (2) and a medium-temperature hot waste gas inlet of the waste heat boiler (4).
4. The power generation system by using the sintering waste heat with the reheating function through the steam as claimed in claim 1, wherein a high-temperature section air chamber, a middle-temperature section air chamber and a low-temperature section air chamber are arranged on the lower side of the circular cooler (2), a first flue gas pipeline (11) is arranged between a hot waste gas outlet of the waste heat boiler and cold air inlets of the high-temperature section air chamber and the middle-temperature section air chamber for connection, a circulating fan (22) is arranged on the first flue gas pipeline (11), and a blower (24) is arranged at a cold air inlet of the low-temperature section air chamber.
5. A steam reheated sintered waste heat power generating system as claimed in claim 1, further comprising a generator (6), wherein said steam turbine (5) is connected to the generator (6).
6. The system for generating power by using sintering waste heat through reheating of steam as claimed in claim 1, wherein the first steam pipeline (7), the second steam pipeline (8), the third steam pipeline (10) and the fourth steam pipeline (13) are all provided with heat insulation layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222038190.9U CN217900524U (en) | 2022-08-03 | 2022-08-03 | Sintering waste heat power generation system adopting steam reheating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222038190.9U CN217900524U (en) | 2022-08-03 | 2022-08-03 | Sintering waste heat power generation system adopting steam reheating |
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| CN217900524U true CN217900524U (en) | 2022-11-25 |
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| CN202222038190.9U Active CN217900524U (en) | 2022-08-03 | 2022-08-03 | Sintering waste heat power generation system adopting steam reheating |
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