CN110986018A - System is utilized to rich coal gas high efficiency of iron and steel enterprise - Google Patents

System is utilized to rich coal gas high efficiency of iron and steel enterprise Download PDF

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Publication number
CN110986018A
CN110986018A CN201911110763.0A CN201911110763A CN110986018A CN 110986018 A CN110986018 A CN 110986018A CN 201911110763 A CN201911110763 A CN 201911110763A CN 110986018 A CN110986018 A CN 110986018A
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China
Prior art keywords
steam
flow distributor
communicated
outlet
inlet
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CN201911110763.0A
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Chinese (zh)
Inventor
王颖洁
蔡发明
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MCC Capital Engineering and Research Incorporation Ltd
Ceri Environmental Protection Techonology Co Ltd
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MCC Capital Engineering and Research Incorporation Ltd
Ceri Environmental Protection Techonology Co Ltd
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Priority to CN201911110763.0A priority Critical patent/CN110986018A/en
Publication of CN110986018A publication Critical patent/CN110986018A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
    • 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
    • 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
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • 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
    • 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
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26—Automatic feed-control systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Turbines (AREA)

Abstract

The invention discloses a rich gas efficient utilization system for a steel enterprise, which comprises a first boiler (1), a first steam flow distributor (121), a second steam flow distributor (122), a first blast turbine (2), a power generation turbine (4), a first condenser (61) and a second condenser (62). The rich gas efficient utilization system for the iron and steel enterprises can utilize the steam turbine generators connected with the main pipes in parallel to realize the support of the blast furnace pneumatic blower, so that the boiler can adapt to the load change of the blast furnace pneumatic blower unit, and the steam system with high-temperature ultrahigh pressure and once reheating is adopted, thereby greatly improving the efficiency of energy conversion. The high-efficiency utilization system for the rich gas of the iron and steel enterprises also adopts the steam flow distributor and the feed water flow distributor to adjust the loads of the boiler and the unit at any time so as to adapt to the rich gas and the fluctuation of the working condition of the blast furnace.

Description

System is utilized to rich coal gas high efficiency of iron and steel enterprise
Technical Field
The invention relates to a system for efficiently utilizing rich gas of iron and steel enterprises.
Background
The blast furnace blower is one of main energy consumption equipment of the iron and steel enterprises, the driving mode of the blast furnace blower is mostly electric or pneumatic, the selection of the driving mode has great influence on the generating capacity of the self-contained power plant of the iron and steel enterprises, and the blast furnace blower is one of the key factors for efficiently utilizing abundant coal gas of the iron and steel enterprises. Blast furnace blowers are closely related to self-provided power plants of iron and steel enterprises, and how to utilize rich coal gas more efficiently is considered in a unified way.
In recent years, with the improvement of power generation parameters of self-contained power plants in steel mills, steam parameters sequentially undergo several development processes of medium-temperature medium-pressure, secondary-high-pressure, high-temperature high-pressure and high-temperature ultrahigh-pressure single reheating. In the period that high temperature high pressure steam parameter is the mainstream, the self-contained power plant generally adopts the main control system operation, and a blast furnace steam-driven blower + a turbo generator that two boilers are supporting promptly, and the load can be adjusted at any time according to blast furnace operating mode to the steam-driven blower, and the turbo generator that same main pipe was parallelly connected can follow the steam-driven blower operating mode and adjust the power generation load to guarantee the stability of boiler operating mode. The existing self-contained power plant gas power generation generally adopts high-temperature ultrahigh-pressure single reheating, a unit heating power system with a boiler provided with a steam turbine is adopted, and no intermediate reheating unit of a main pipe system exists. The support of a steam turbine generator with a main pipe connected in parallel to a blast furnace steam blower is lacked, and a high-temperature ultrahigh-pressure single-reheat boiler made of units is difficult to adapt to the load change of a blast furnace steam blower unit, so that the mode construction and operation of a high-temperature ultrahigh-pressure single-reheat self-contained power plant and an electric blast furnace blower are generally adopted by steel mills at present.
The blast furnace blower is electrically driven, which is a main factor that the power consumption of iron and steel enterprises cannot be greatly reduced, and the energy loss is increased due to the increase of the voltage boosting, voltage reducing and energy conversion links of a power transmission and distribution system. The blast furnace blower adopts steam-driven, and a unit high-temperature ultrahigh-pressure once-reheating system cannot be adopted, so that the efficiency of a steam turbine is far lower than that of a high-parameter power generation steam turbine, the heat efficiency of the whole plant is lower, and the byproduct coal gas of a steel enterprise cannot be efficiently utilized.
Disclosure of Invention
In order to improve the heat efficiency of the rich gas utilization of the iron and steel enterprises, the invention provides the rich gas high-efficiency utilization system of the iron and steel enterprises, which can not only meet the safe and stable operation of blast furnace blowers, but also improve the utilization efficiency of the gas, reduce the energy loss and reduce the power consumption of the iron and steel enterprises.
The technical scheme adopted by the invention for solving the technical problems is as follows: a rich gas efficient utilization system for iron and steel enterprises comprises a first boiler, a first steam flow distributor, a second steam flow distributor, a first blast turbine, a power generation turbine, a first condenser and a second condenser; the superheater outlet of the first boiler is communicated with the main steam main pipe, and the superheater inlet of the first boiler can be communicated with the main water supply main pipe; the main steam main pipe is communicated with a main steam inlet of the first steam flow distributor, a first main steam outlet of the first steam flow distributor is communicated with a high-pressure cylinder inlet of the first air blast turbine, a high-pressure cylinder outlet of the first air blast turbine is communicated with the low-temperature reheat steam main pipe, and a second main steam outlet of the first steam flow distributor is communicated with the low-temperature reheat steam main pipe; the main steam main pipe is communicated with a main steam inlet of a second steam flow distributor, a first main steam outlet of the second steam flow distributor is communicated with a high-pressure cylinder inlet of a power generation turbine, a high-pressure cylinder outlet of the power generation turbine is communicated with a low-temperature reheating steam main pipe, and a second main steam outlet of the second steam flow distributor is communicated with the low-temperature reheating steam main pipe; the low-temperature reheat steam main pipe can be communicated with an inlet of a reheater of the first boiler, and an outlet of the reheater of the first boiler is communicated with the high-temperature reheat steam main pipe; the high-temperature reheating steam main pipe is communicated with a high-temperature reheating steam inlet of a first steam flow distributor, a first high-temperature reheating steam outlet of the first steam flow distributor is communicated with a medium-low pressure cylinder inlet of a first blast turbine, a medium-low pressure cylinder outlet of the first blast turbine is communicated with a first inlet of a first condenser, and a second high-temperature reheating steam outlet of the first steam flow distributor is communicated with a second inlet of the first condenser; the high-temperature reheating steam main pipe is communicated with a high-temperature reheating steam inlet of the second steam flow distributor, a first high-temperature reheating steam outlet of the second steam flow distributor is communicated with a medium-low pressure cylinder inlet of the power generation turbine, a medium-low pressure cylinder outlet of the power generation turbine is communicated with a first inlet of the second condenser, and a second high-temperature reheating steam outlet of the second steam flow distributor is communicated with a second inlet of the second condenser.
The steel enterprise rich gas efficient utilization system further comprises a second boiler and a water supply flow distributor, wherein a superheater outlet of the second boiler is communicated with a main steam main pipe, a reheater outlet of the second boiler is communicated with a high-temperature reheated steam main pipe, an inlet of the water supply flow distributor is communicated with a main water supply main pipe, a first outlet of the water supply flow distributor is communicated with a superheater inlet of the first boiler, and a second outlet of the water supply flow distributor is communicated with a superheater inlet of the second boiler.
The rich gas high-efficiency utilization system of the iron and steel enterprise further comprises a second boiler and a low-temperature reheating steam flow distributor, the superheater outlet of the second boiler is communicated with the main steam main pipe, the reheater outlet of the second boiler is communicated with the high-temperature reheating steam main pipe, the inlet of the low-temperature reheating steam flow distributor is communicated with the low-temperature reheating steam main pipe, the first outlet of the low-temperature reheating steam flow distributor is communicated with the reheater inlet of the first boiler, and the second outlet of the low-temperature reheating steam flow distributor is communicated with the reheater inlet of the second boiler.
An outlet of the first condenser is connected with a condensate mother pipe through a first pipeline, and a condensate pump and a low-pressure heater are sequentially arranged on the first pipeline; the outlet of the second condenser is connected with a condensate mother pipe through a second pipeline, and a condensate pump and a low-pressure heater are sequentially arranged on the second pipeline.
And a third pipeline is connected between the main water supply main pipe and the condensed water main pipe, and a deaerator, a water supply pump and a high-pressure heater are sequentially arranged on the third pipeline.
And a fourth pipeline is connected between the main water supply main pipe and the condensed water main pipe, and a deaerator, a water supply pump and a high-pressure heater are sequentially arranged on the fourth pipeline.
The high-efficiency utilization system for the rich gas of the iron and steel enterprises further comprises a third steam flow distributor, a second blast turbine and a third condenser; the main steam main pipe is communicated with a main steam inlet of a third steam flow distributor, a first main steam outlet of the third steam flow distributor is communicated with a high-pressure cylinder inlet of a second air blast turbine, a high-pressure cylinder outlet of the second air blast turbine is communicated with a low-temperature reheating steam main pipe, and a second main steam outlet of the third steam flow distributor is communicated with the low-temperature reheating steam main pipe; the high-temperature reheating steam main pipe is communicated with a high-temperature reheating steam inlet of a third steam flow distributor, a first high-temperature reheating steam outlet of the third steam flow distributor is communicated with a medium-low pressure cylinder inlet of a second air blast turbine, a medium-low pressure cylinder outlet of the second air blast turbine is communicated with a first inlet of a third condenser, and a second high-temperature reheating steam outlet of the third steam flow distributor is communicated with a second inlet of the third condenser.
The outlet of the third condenser is connected with a condensate mother pipe through a fifth pipeline, and a condensate pump and a low-pressure heater are sequentially arranged on the fifth pipeline.
The first steam flow distributor has the same configuration as the second steam flow distributor, the first steam flow distributor can adjust the flow rate of the main steam entering from the main steam inlet of the first steam flow distributor and exiting from the main steam first outlet of the first steam flow distributor and the main steam second outlet of the first steam flow distributor, and the first steam flow distributor can also adjust the flow rate of the high-temperature reheat steam entering from the high-temperature reheat steam inlet of the first steam flow distributor and exiting from the high-temperature reheat steam first outlet of the first steam flow distributor and the high-temperature reheat steam second outlet of the first steam flow distributor.
The first boiler is a gas boiler, the first blast turbine is connected with an air blower, the power generation turbine is connected with a power generator, and the air blower can blow air for the blast furnace.
The invention has the beneficial effects that: the steam turbine generator with the main pipe connected in parallel can be used for supporting the blast furnace steam blower, so that the boiler can adapt to the load change of the blast furnace steam blower unit, and the efficiency of energy conversion is greatly improved by adopting a high-temperature ultrahigh-pressure steam system with one-time reheating. The high-efficiency utilization system for the rich gas of the iron and steel enterprises also adopts the steam flow distributor and the feed water flow distributor to adjust the loads of the boiler and the unit at any time so as to adapt to the rich gas and the fluctuation of the working condition of the blast furnace.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a front view of the system for efficiently utilizing rich gas of a steel enterprise according to the present invention.
FIG. 2 is a schematic illustration of a first steam flow distributor coupled to a first blast turbine.
FIG. 3 is a schematic diagram of the connection of a second steam flow distributor to a power generation turbine.
FIG. 4 is a schematic illustration of a third steam flow distributor coupled to a second blast turbine.
Fig. 5 is a schematic diagram of a steam flow distributor.
FIG. 6 is a schematic view of a feedwater flow distributor.
1. A first boiler; 2. a first blast turbine; 3. a blower; 4. a power generation turbine; 5. a generator; 61. a first condenser; 62. a second condenser; 63. a third condenser; 7. a condensate pump; 8. a low pressure heater; 9. a deaerator; 10. a feed pump; 11. a high pressure heater; 121. a first steam flow distributor; 122. a second steam flow distributor; 123. a third steam flow distributor; 13. a feed water flow distributor; 14. a low temperature reheat steam flow distributor; 15. a main steam main pipe; 16. a high-temperature reheat steam main pipe; 17. a low-temperature reheat steam main pipe; 18. a main water supply main pipe; 19. a condensate header; 20. a second boiler; 21. a second blast turbine;
1211. a primary steam inlet of a first steam flow distributor; 1212. a primary steam first outlet of the first steam flow distributor; 1213. a main steam second outlet of the first steam flow distributor; 1214. a high temperature reheat steam inlet of a first steam flow distributor; 1215. a high temperature reheat steam first outlet of the first steam flow distributor; 1216. a high temperature reheat steam second outlet of the first steam flow distributor;
1221. a main steam inlet of a second steam flow distributor; 1222. a primary steam first outlet of a second steam flow distributor; 1223. a main steam second outlet of the second steam flow distributor; 1224. a high temperature reheat steam inlet of a second steam flow distributor; 1225. a high temperature reheat steam first outlet of the second steam flow distributor; 1226. a high temperature reheat steam second outlet of the second steam flow distributor;
1231. a main steam inlet of a third steam flow distributor; 1232. a primary steam first outlet of a third steam flow distributor; 1233. a main steam second outlet of the third steam flow distributor; 1234. a high temperature reheat steam inlet of a third steam flow distributor; 1235. a high temperature reheat steam first outlet of the third steam flow distributor; 1236. a high temperature reheat steam second outlet of the third steam flow distributor;
201. a first pipeline; 202. a second pipeline; 203. a third pipeline; 204. a fourth pipeline; 205. a fifth pipeline; 206. a flow regulating valve.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The system for efficiently utilizing rich gas of the iron and steel enterprises comprises a first boiler 1, a first steam flow distributor 121, a second steam flow distributor 122, a first blast turbine 2, a power generation turbine 4, a first condenser 61 and a second condenser 62; the superheater outlet of the first boiler 1 is communicated with a main steam main pipe 15, and the superheater inlet of the first boiler 1 can be communicated with a main water supply main pipe 18; the main steam main pipe 15 is communicated with a main steam inlet 1211 of the first steam flow distributor, a first main steam outlet 1212 of the first steam flow distributor is communicated with a high-pressure cylinder inlet of the first blast turbine 2, a high-pressure cylinder outlet of the first blast turbine 2 is communicated with the low-temperature reheat steam main pipe 17, and a second main steam outlet 1213 of the first steam flow distributor is communicated with the low-temperature reheat steam main pipe 17; the main steam main pipe 15 is communicated with a main steam inlet 1221 of a second steam flow distributor, a first main steam outlet 1222 of the second steam flow distributor is communicated with a high-pressure cylinder inlet of the power generation turbine 4, a high-pressure cylinder outlet of the power generation turbine 4 is communicated with the low-temperature reheat steam main pipe 17, and a second main steam outlet 1223 of the second steam flow distributor is communicated with the low-temperature reheat steam main pipe 17; the low-temperature reheat steam main pipe 17 can be communicated with a reheater inlet of the first boiler 1, and a reheater outlet of the first boiler 1 is communicated with the high-temperature reheat steam main pipe 16; the high-temperature reheat steam header 16 is communicated with a high-temperature reheat steam inlet 1214 of the first steam flow distributor, a first high-temperature reheat steam outlet 1215 of the first steam flow distributor is communicated with an inlet of a medium-low pressure cylinder of the first blast turbine 2, an outlet of the medium-low pressure cylinder of the first blast turbine 2 is communicated with a first inlet of the first condenser 61, and a second high-temperature reheat steam outlet 1216 of the first steam flow distributor is communicated with a second inlet of the first condenser 61; the high-temperature reheat steam header 16 is communicated with the high-temperature reheat steam inlet 1224 of the second steam flow distributor, the first high-temperature reheat steam outlet 1225 of the second steam flow distributor is communicated with the medium-low cylinder inlet of the power generation turbine 4, the medium-low cylinder outlet of the power generation turbine 4 is communicated with the first inlet of the second condenser 62, and the second high-temperature reheat steam outlet 1226 of the second steam flow distributor is communicated with the second inlet of the second condenser 62, as shown in fig. 1 to 4.
In the rich gas high-efficiency utilization system of iron and steel enterprises, a main pipe gas power generation and blast furnace steam blower system is adopted, the power generation turbine 4 and the power generator 5 which are connected in parallel by the main pipe can be utilized to support the blast furnace steam blower, so that the boiler can adapt to the load change of a blast furnace steam blower unit, and a high-temperature ultrahigh-pressure once-reheating steam system is adopted, thereby greatly improving the efficiency of energy conversion. The first steam flow distributor 121 and the second steam flow distributor 122 can adjust the loads of the first blast turbine 2 and the power generation turbine 4 at any time to adapt to fluctuation of rich gas and blast furnace working conditions.
The system for efficiently utilizing rich gas of the iron and steel enterprises is not limited to one boiler to one turbonator and one turbo blower. The system for efficiently utilizing rich gas of the iron and steel enterprises, disclosed by the invention, can also comprise 2 boilers, 1 turbogenerator and 2 turbo blowers, wherein one boiler is only an exemplary embodiment for one turbogenerator and one turbo blower. The system for efficiently utilizing rich gas of the iron and steel enterprises can also be used for 2 steam turbine generators and 1 steam turbine blower by 2 boilers. For example, the rich gas efficient utilization system of the steel enterprise further comprises a second boiler 20, a feedwater flow distributor 13 and a low-temperature reheat steam flow distributor 14.
In the present embodiment, the superheater outlet of the second boiler 20 communicates with the main steam header 15, the reheater outlet of the second boiler 20 communicates with the high-temperature reheat steam header 16, the inlet of the feedwater flow distributor 13 communicates with the main feedwater header 18, the first outlet of the feedwater flow distributor 13 communicates with the superheater inlet of the first boiler 1, and the second outlet of the feedwater flow distributor 13 communicates with the superheater inlet of the second boiler 20. The superheater outlet of the second boiler 20 is communicated with the main steam header 15, the reheater outlet of the second boiler 20 is communicated with the high-temperature reheat steam header 16, the inlet of the low-temperature reheat steam flow distributor 14 is communicated with the low-temperature reheat steam header 17, the first outlet of the low-temperature reheat steam flow distributor 14 is communicated with the reheater inlet of the first boiler 1, and the second outlet of the low-temperature reheat steam flow distributor 14 is communicated with the reheater inlet of the second boiler 20. The load of the boilers (the first boiler 2 and the second boiler 20) can be adjusted at any time by the feed water flow distributor 13 and the low-temperature reheat steam flow distributor 14 so as to adapt to the fluctuation of rich gas and blast furnace working conditions.
In the embodiment, the outlet of the first condenser 61 is connected with the condensate header 19 through a first pipeline 201, and the condensate pump 7 and the low-pressure heater 8 are sequentially arranged on the first pipeline 201; the outlet of the second condenser 62 is connected with the condensate water main pipe 19 through a second pipeline 202, and a condensate water pump 7 and a low-pressure heater 8 are sequentially arranged on the second pipeline 202. A third pipeline 203 is connected between the main water supply main pipe 18 and the condensed water main pipe 19, and the third pipeline 203 is sequentially provided with a deaerator 9, a water supply pump 10 and a high-pressure heater 11. A fourth pipeline 204 is connected between the main water supply main pipe 18 and the condensed water main pipe 19, and a deaerator 9, a water supply pump 10 and a high-pressure heater 11 are sequentially arranged on the fourth pipeline 204, as shown in fig. 1.
In this embodiment, the system for efficiently utilizing rich gas of the iron and steel enterprise may further include a third steam flow distributor 123, a second blast turbine 21, and a third condenser 63; the main steam main pipe 15 is communicated with a main steam inlet 1231 of a third steam flow distributor, a first main steam outlet 1232 of the third steam flow distributor is communicated with a high-pressure cylinder inlet of a second air blast turbine 21, a high-pressure cylinder outlet of the second air blast turbine 21 is communicated with a low-temperature reheating steam main pipe 17, and a second main steam outlet 1233 of the third steam flow distributor is communicated with the low-temperature reheating steam main pipe 17; the high-temperature reheat steam header 16 is communicated with a high-temperature reheat steam inlet 1234 of a third steam flow distributor, a first high-temperature reheat steam outlet 1235 of the third steam flow distributor is communicated with a medium-low cylinder inlet of the second blower turbine 21, a medium-low cylinder outlet of the second blower turbine 21 is communicated with a first inlet of a third condenser 63, and a second high-temperature reheat steam outlet 1236 of the third steam flow distributor is communicated with a second inlet of the third condenser 63. The outlet of the third condenser 63 is connected with the condensate water main pipe 19 through a fifth pipeline 205, and a condensate water pump 7 and a low-pressure heater 8 are sequentially arranged on the fifth pipeline 205.
In the present embodiment, the configuration of the first steam flow distributor 121, the configuration of the second steam flow distributor 122, and the configuration of the third steam flow distributor 123 are identical, and the configuration of the first steam flow distributor 121 is as shown in fig. 5. The first steam flow distributor 121 can adjust the flow of the main steam, which enters from the main steam inlet 1211 of the first steam flow distributor and is discharged from the main steam first outlet 1212 and the main steam second outlet 1213 of the first steam flow distributor, through the flow adjustment valve 206, and the first steam flow distributor 121 can also adjust the flow of the high temperature reheat steam, which enters from the high temperature reheat steam inlet 1214 of the first steam flow distributor and is discharged from the high temperature reheat steam first outlet 1215 of the first steam flow distributor and the high temperature reheat steam second outlet 1216 of the first steam flow distributor, through the flow adjustment valve 206.
In the present embodiment, the structure of the feed water flow distributor 13 is completely the same as that of the low-temperature reheat steam flow distributor 14, the structure of the feed water flow distributor 13 is substantially the same as that of a tee, and a flow regulating valve 206 is provided in the feed water flow distributor 13, as shown in fig. 6. An inlet is provided at the lower part of the feed water flow distributor 13, a first outlet is provided at the right side of the feed water flow distributor 13, and a second outlet is provided at the left side of the feed water flow distributor 13. The lower part of low temperature reheat steam flow distributor 14 is equipped with the entry, and the right side of low temperature reheat steam flow distributor 14 is equipped with first export, and the left side of low temperature reheat steam flow distributor 14 is equipped with the second export. The feed water flow distributor 13 includes a 100% capacity flow regulator and a 50% capacity flow regulator for each boiler to accommodate different load variations of the boilers. The low temperature reheat steam flow distributor 14 includes flow regulating devices for each boiler to accommodate different load changes of the boiler.
In this embodiment, the first boiler 1 and the second boiler 20 are both high-temperature ultra-high-pressure single-reheat gas boilers, the fuels of the first boiler 1 and the second boiler 20 are both blast furnace surplus gas, the first air turbine 2 is a high-temperature ultra-high-pressure single-reheat air turbine, and the power generation turbine 4 is a high-temperature ultra-high-pressure single-reheat power generation turbine. In fig. 1, the left side portions of the first and second boilers 1 and 20 are superheaters, and the right side portions of the first and second boilers 1 and 20 are reheaters. The first blast turbine 2 is connected with a blower 3, the power generation turbine 4 is connected with a generator 5, the blower 3 can blow air to the blast furnace, and the generator 5 is used for balancing the rich coal gas quantity, namely after the steam generated by rich coal gas firstly ensures the output of the blower, the residual steam is supplied to the generator 5 so as to balance the rich coal gas quantity.
The working process of the rich gas high-efficiency utilization system of the iron and steel enterprise is described below.
The superheater of the first boiler 1 and the second boiler 20 generates main steam (540 ℃, 13.7MPa. g) which is merged into a main steam main pipe 15, and the main steam main pipe 15 is respectively connected with a high-pressure cylinder inlet of the power generation turbine 4 and a high-pressure cylinder inlet of the first blast turbine 2 through branch pipes. After the main steam works in the high-pressure cylinder, the high-pressure cylinder of the power generation steam turbine 4 and the high-pressure cylinder of the air blast steam turbine 2 respectively discharge low-temperature reheat steam (330 ℃, 2.52MPa. a) and merge into the low-temperature reheat steam main pipe 17, the low-temperature reheat steam main pipe 17 is communicated with reheater inlets of the first boiler 1 and the second boiler 20, and the low-temperature reheat steam enters reheaters of the first boiler 1 and the second boiler 20 for heating. High-temperature reheat steam (540 ℃, 2.27mpa. a) generated by reheaters of the first boiler 1 and the second boiler 20 is merged into the high-temperature reheat steam main pipe 16, and the high-temperature reheat steam main pipe 16 is respectively connected to the inlets of the medium and low pressure cylinders of the power generation turbine 4 and the inlets of the medium and low pressure cylinders of the first air turbine 2 through branch pipes. The high-temperature reheated steam expands in the steam turbine to do work, exchanges heat in the condenser 6 to be cooled and condensed into water, the water enters the condensed water main pipe 19 after the temperature is further increased through pressurization of the condensed water pump 7 and heat exchange of the low-pressure heater 8, and the condensed water main pipe 19 is communicated with a condensed water inlet of the deaerator 9. And after the deaerator 9 heats and deaerates the condensed water, the condensed water enters the deaerating water tank of the deaerator 9. And the outlet water of the deoxygenation water tank enters a water feeding pump 10 for pressurization, and enters a main water feeding main pipe 18 after being subjected to heat exchange and temperature rise through a high-pressure heater 11, and the main water feeding main pipe 18 is communicated with coal economizer inlets of a first boiler 1 and a second boiler 20. The main feed water enters the economizer of the boiler (the first boiler 1 and the second boiler 20), is heated and vaporized in the boiler, and is discharged from the superheater of the first boiler 1 and the second boiler 20, so that steam-water circulation is formed, as shown in fig. 1.
The blower unit (the first and second blower turbines 2 and 21) is connected to the blast furnace blower so as to supply operational energy to the blast furnace blower for ensuring the normal operation of the blast furnace. And the turbonator (the power generation turbine 4 and the power generator 5) group is used for balancing the surplus gas quantity of the iron and steel enterprises. Under the condition that the rich gas quantity is not changed, when the blast furnace blower unit increases the load along with the operation condition of the blast furnace, the steam flow distributors (the first steam flow distributor 121, the second steam flow distributor 122 and the third steam flow distributor 123) need to be correspondingly adjusted, the flow of main steam at the inlet of the blast furnace blower unit is increased, and the flow of main steam at the inlet of the steam turbine generator unit is decreased; when the blast furnace blower unit reduces the load along with the operation condition of the blast furnace, the steam flow distributors (the first steam flow distributor 121, the second steam flow distributor 122 and the third steam flow distributor 123) need to be correspondingly adjusted, the inlet main steam flow of the blast furnace blower unit is reduced, and the inlet main steam flow of the steam turbine generator unit is increased. When the flow of the reheat steam is below 30% of the flow of the reheat steam, the steam flow distributor can adjust the flow of the reheat steam to maintain the necessary minimum pressure in the reheater; when the reheat steam flow is greater than 30%, the steam flow distributor only regulates the main steam flow. When the operating conditions of the boilers (the first boiler 1 and the second boiler 20) and the turbines (the first blast turbine 2 and the second blast turbine 21) and the power generation turbine 4 are not matched, that is, the main steam amount generated by the boilers is greater than the main steam amount required by the turbines and the turbines, the redundant main steam does not pass through the turbines (the first blast turbine 2 and the second blast turbine 21) and the high-pressure cylinders of the power generation turbine 4 and directly enters the low-temperature reheat steam main pipe 17 through the steam flow distributor for temperature and pressure reduction. When the amount of reheat steam generated by the boilers (the first boiler 1 and the second boiler 20) is larger than the amount of reheat steam required by the turbines (the first blast turbine 2 and the second blast turbine 21) and the power generation turbine 4, the excess reheat steam generated by the boilers (the first boiler 1 and the second boiler 20) is directly subjected to temperature and pressure reduction and enters the condenser through the steam flow distributor without passing through the turbines (the first blast turbine 2 and the second blast turbine 21) and the medium and low pressure cylinder of the power generation turbine 4.
The feed water flow distributor 13 ensures that the steam drums of the boilers (the first boiler 1 and the second boiler 20) are maintained at a normal water level, and the opening degree of the feed water flow distributor 13 needs to be increased when the steam drum water level of the boilers (the first boiler 1 and the second boiler 20) is reduced to an allowable lowest water level; the feed water flow distributor 13 opening needs to be reduced when the boiler drum level rises to the maximum allowable level.
The low-temperature reheat steam flow distributor 14 ensures that the high-temperature reheat steam at the outlet of the boiler is maintained in a normal range, and when the temperature of the high-temperature reheat steam generated by the boilers (the first boiler 1 and the second boiler 20) is reduced to an allowable lowest temperature, the opening degree of the low-temperature reheat steam flow distributor 14 needs to be reduced; when the temperature of the high-temperature reheat steam generated by the boiler rises to the allowable maximum temperature, the opening degree of the low-temperature reheat steam flow distributor 14 needs to be increased.
The system for efficiently utilizing the rich gas of the iron and steel enterprises realizes the combined supply of power generation and blast furnace blast by taking the rich gas of the iron and steel enterprises as fuel mainly through comprehensively considering the layout optimization of energy households for blast furnace iron making and self-contained gas power stations of whole factories. The invention adopts the steam generated by the high-temperature ultrahigh-pressure reheating blast furnace gas boiler to respectively supply steam to the blast furnace pneumatic blower and the steam turbine generator through the main pipe system operation and the flow regulating device, thereby not only meeting different operation conditions of the blast furnace blower, but also being suitable for the fluctuation of rich gas of iron and steel enterprises.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical schemes, and the technical schemes can be freely combined and used.

Claims (10)

1. The system for efficiently utilizing rich gas of the steel enterprises is characterized by comprising a first boiler (1), a first steam flow distributor (121), a second steam flow distributor (122), a first blast turbine (2), a power generation turbine (4), a first condenser (61) and a second condenser (62);
the superheater outlet of the first boiler (1) is communicated with a main steam main pipe (15), and the superheater inlet of the first boiler (1) can be communicated with a main water supply main pipe (18);
the main steam main pipe (15) is communicated with a main steam inlet (1211) of the first steam flow distributor, a first main steam outlet (1212) of the first steam flow distributor is communicated with a high-pressure cylinder inlet of the first air blast turbine (2), a high-pressure cylinder outlet of the first air blast turbine (2) is communicated with the low-temperature reheating steam main pipe (17), and a second main steam outlet (1213) of the first steam flow distributor is communicated with the low-temperature reheating steam main pipe (17);
the main steam main pipe (15) is communicated with a main steam inlet (1221) of a second steam flow distributor, a first main steam outlet (1222) of the second steam flow distributor is communicated with a high-pressure cylinder inlet of a power generation turbine (4), a high-pressure cylinder outlet of the power generation turbine (4) is communicated with the low-temperature reheat steam main pipe (17), and a second main steam outlet (1223) of the second steam flow distributor is communicated with the low-temperature reheat steam main pipe (17);
the low-temperature reheat steam main pipe (17) can be communicated with a reheater inlet of the first boiler (1), and a reheater outlet of the first boiler (1) is communicated with the high-temperature reheat steam main pipe (16);
the high-temperature reheat steam header pipe (16) is communicated with a high-temperature reheat steam inlet (1214) of the first steam flow distributor, a first high-temperature reheat steam outlet (1215) of the first steam flow distributor is communicated with an inlet of a medium-low pressure cylinder of the first blast turbine (2), an outlet of the medium-low pressure cylinder of the first blast turbine (2) is communicated with a first inlet of the first condenser (61), and a second high-temperature reheat steam outlet (1216) of the first steam flow distributor is communicated with a second inlet of the first condenser (61);
the high-temperature reheat steam main pipe (16) is communicated with a high-temperature reheat steam inlet (1224) of the second steam flow distributor, a first high-temperature reheat steam outlet (1225) of the second steam flow distributor is communicated with an inlet of a medium-low pressure cylinder of the power generation turbine (4), an outlet of the medium-low pressure cylinder of the power generation turbine (4) is communicated with a first inlet of the second condenser (62), and a second high-temperature reheat steam outlet (1226) of the second steam flow distributor is communicated with a second inlet of the second condenser (62).
2. The rich gas high-efficiency utilization system of the steel enterprise as claimed in claim 1, further comprising a second boiler (20) and a feedwater flow distributor (13), wherein a superheater outlet of the second boiler (20) is communicated with the main steam header (15), a reheater outlet of the second boiler (20) is communicated with the high-temperature reheat steam header (16), an inlet of the feedwater flow distributor (13) is communicated with the main feedwater header (18), a first outlet of the feedwater flow distributor (13) is communicated with a superheater inlet of the first boiler (1), and a second outlet of the feedwater flow distributor (13) is communicated with a superheater inlet of the second boiler (20).
3. The rich gas high-efficiency utilization system of the steel enterprise as claimed in claim 1, further comprising a second boiler (20) and a low-temperature reheat steam flow distributor (14), wherein a superheater outlet of the second boiler (20) is communicated with the main steam main pipe (15), a reheater outlet of the second boiler (20) is communicated with the high-temperature reheat steam main pipe (16), an inlet of the low-temperature reheat steam flow distributor (14) is communicated with the low-temperature reheat steam main pipe (17), a first outlet of the low-temperature reheat steam flow distributor (14) is communicated with a reheater inlet of the first boiler (1), and a second outlet of the low-temperature reheat steam flow distributor (14) is communicated with a reheater inlet of the second boiler (20).
4. The rich gas efficient utilization system of the steel enterprises according to claim 1, wherein the outlet of the first condenser (61) is connected with the condensate water main pipe (19) through a first pipeline (201), and the first pipeline (201) is sequentially provided with a condensate pump (7) and a low-pressure heater (8); the outlet of the second condenser (62) is connected with a condensate water main pipe (19) through a second pipeline (202), and a condensate pump (7) and a low-pressure heater (8) are sequentially arranged on the second pipeline (202).
5. The system for efficiently utilizing rich gas of steel enterprises according to claim 1, wherein a third pipeline (203) is connected between the main water supply main pipe (18) and the condensed water main pipe (19), and the third pipeline (203) is sequentially provided with a deaerator (9), a water supply pump (10) and a high pressure heater (11).
6. The system for efficiently utilizing rich gas of the steel enterprises as claimed in claim 5, wherein a fourth pipeline (204) is connected between the main water supply main pipe (18) and the condensed water main pipe (19), and the fourth pipeline (204) is sequentially provided with a deaerator (9), a water supply pump (10) and a high pressure heater (11).
7. The rich gas high-efficiency utilization system for steel enterprises according to claim 1, further comprising a third steam flow distributor (123), a second blast turbine (21) and a third condenser (63);
the main steam main pipe (15) is communicated with a main steam inlet (1231) of a third steam flow distributor, a first main steam outlet (1232) of the third steam flow distributor is communicated with a high-pressure cylinder inlet of a second air blast turbine (21), a high-pressure cylinder outlet of the second air blast turbine (21) is communicated with a low-temperature reheat steam main pipe (17), and a second main steam outlet (1233) of the third steam flow distributor is communicated with the low-temperature reheat steam main pipe (17);
the high-temperature reheating steam header pipe (16) is communicated with a high-temperature reheating steam inlet (1234) of a third steam flow distributor, a first high-temperature reheating steam outlet (1235) of the third steam flow distributor is communicated with a medium-low pressure cylinder inlet of a second blast turbine (21), a medium-low pressure cylinder outlet of the second blast turbine (21) is communicated with a first inlet of a third condenser (63), and a second high-temperature reheating steam outlet (1236) of the third steam flow distributor is communicated with a second inlet of the third condenser (63).
8. The system for efficiently utilizing rich gas of steel enterprises according to claim 7, wherein the outlet of the third condenser (63) is connected with the condensate header pipe (19) through a fifth pipeline (205), and the fifth pipeline (205) is sequentially provided with a condensate pump (7) and a low-pressure heater (8).
9. The system for the efficient utilization of rich gas of iron and steel works as claimed in claim 1, wherein the first steam flow distributor (121) has the same configuration as the second steam flow distributor (122), the first steam flow distributor (121) can adjust the flow of the main steam entering from the main steam inlet (1211) of the first steam flow distributor and exiting from the main steam first outlet (1212) of the first steam flow distributor and the main steam second outlet (1213) of the first steam flow distributor, the first steam flow distributor (121) is further capable of regulating a flow of high temperature reheat steam entering from the high temperature reheat steam inlet (1214) of the first steam flow distributor and exiting from the high temperature reheat steam first outlet (1215) of the first steam flow distributor and the high temperature reheat steam second outlet (1216) of the first steam flow distributor.
10. The system for efficiently utilizing rich gas of steel enterprises according to claim 1, wherein the first boiler (1) is a gas boiler, the first blast turbine (2) is connected with a blower (3), the power generation turbine (4) is connected with a generator (5), and the blower (3) can blow air to the blast furnace.
CN201911110763.0A 2019-11-14 2019-11-14 System is utilized to rich coal gas high efficiency of iron and steel enterprise Pending CN110986018A (en)

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CN201911110763.0A CN110986018A (en) 2019-11-14 2019-11-14 System is utilized to rich coal gas high efficiency of iron and steel enterprise

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Application Number Priority Date Filing Date Title
CN201911110763.0A CN110986018A (en) 2019-11-14 2019-11-14 System is utilized to rich coal gas high efficiency of iron and steel enterprise

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CN110986018A true CN110986018A (en) 2020-04-10

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