CN111206968A - Subcritical complementary energy waste heat recovery power generation system of steel plant and working method thereof - Google Patents
Subcritical complementary energy waste heat recovery power generation system of steel plant and working method thereof Download PDFInfo
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- CN111206968A CN111206968A CN202010223468.2A CN202010223468A CN111206968A CN 111206968 A CN111206968 A CN 111206968A CN 202010223468 A CN202010223468 A CN 202010223468A CN 111206968 A CN111206968 A CN 111206968A
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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
- 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
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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
- 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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention provides a subcritical residual energy waste heat recovery power generation system of an iron and steel plant and a working method thereof, which are used for recovering valuable waste heat steam generated by a boiler of the iron and steel plant to a condensing steam turbine set for power generation, wherein the boiler comprises a blast furnace gas boiler for generating subcritical ultrahigh-temperature steam, a medium-pressure waste heat boiler for generating medium-pressure superheated steam and a low-pressure waste heat boiler for generating low-pressure superheated steam or low-pressure saturated steam; subcritical ultrahigh-temperature steam generated by the blast furnace gas boiler is sent to a high-pressure cylinder of a steam turbine and is changed into medium-pressure superheated steam after acting; the invention can reduce the number of generator sets, improve the parameters of the generator sets and improve the generating efficiency of the residual energy and the waste heat of the whole steel plant.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a subcritical complementary energy waste heat recovery power generation system of a steel plant and a working method thereof.
Background
The existing waste energy and waste heat recovery power generation and utilization modes of iron and steel enterprises are dispersed, high-parameter power generation is performed by blast furnace gas, low-parameter (including medium-pressure and low-pressure) superheated steam power generation by sintering waste heat, coke dry quenching waste heat, raw gas waste heat, rotary hearth furnace waste heat and pellet waste heat, and saturated steam power generation is performed by converter and heating furnace saturated steam. This configuration has the following problems: firstly, the fluctuation of saturated steam is large, and the steam is diffused occasionally, so that energy loss is caused; saturated steam power generation, low unit efficiency and prominent blade safety problem; thirdly, the unit arrangement is dispersed, and the investment is higher; the above technical problems need to be solved.
Disclosure of Invention
The invention provides a subcritical residual energy waste heat recovery power generation system of a steel plant and a working method thereof, which can solve the problems of low heat-power conversion efficiency, high kilowatt investment, large occupied area and more operating personnel existing in the distributed residual energy waste heat power generation of the existing steel plant based on the technical principle of 'integral power generation, energy level matching, high energy and high use and temperature alignment'.
The invention adopts the following technical scheme.
The subcritical residual energy waste heat recovery power generation system of the steel plant is used for recovering waste heat steam with a useful value generated by a boiler of the steel plant to a condensation type steam turbine set for power generation, wherein the boiler comprises a blast furnace gas boiler for generating subcritical ultrahigh-temperature steam, a medium-pressure waste heat boiler for generating medium-pressure superheated steam and a low-pressure waste heat boiler for generating low-pressure superheated steam or low-pressure saturated steam;
the steam turbine in the condensation-compensating type steam turbine set comprises a condensation-compensating steam turbine comprising a high pressure cylinder and a condensation-compensating type low pressure cylinder; the main steam output end of the blast furnace gas boiler is communicated with a high-pressure cylinder of a steam-supplementing condensing steam turbine;
the blast furnace gas boiler is provided with a medium-pressure reheater and a low-pressure superheater;
the input end of the medium-pressure reheater is communicated with the medium-pressure superheated steam output end of the medium-pressure waste heat boiler and the steam exhaust end of the high-pressure cylinder of the steam-supplementing condensing steam turbine to receive steam; the steam input into the intermediate-pressure reheater is sent to a low-pressure cylinder of a steam turbine after being reheated;
the input end of the low-pressure superheater is communicated with the output end of the low-pressure waste heat boiler for outputting low-pressure superheated steam or low-pressure saturated steam; the steam input into the low-pressure superheater is sent to a steam supplementing port of a steam turbine after being subjected to heat treatment;
the steam output end of the steam supplementing and condensing steam turbine is connected with the steam inlet end of the condenser; a condensed water pipe of the condenser is communicated with the medium-pressure waste heat boiler and the blast furnace gas boiler through a water supply pipe; and a low-pressure heater and a high-pressure heater for heating water flow in the pipe are arranged at the water supply pipe.
The medium-pressure waste heat boiler comprises a sintering device of an iron and steel plant, a rotary hearth furnace and a waste heat boiler configured in a dry quenching process; the low-pressure waste heat boiler comprises a sintering circular cooler, a converter, a vaporization heating furnace and a waste heat boiler configured in a pelletizing process of an iron and steel plant.
The steam turbine set is used for driving a generator;
when the steam turbine is a steam supplementing and condensing steam turbine, power output shafts of a high pressure cylinder and a low pressure cylinder for driving the generator are coaxial;
when the steam turbine unit further comprises a subcritical steam turbine, the subcritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine are split, and the subcritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine respectively drive different generators.
The water supply pipes comprise a low-pressure water supply pipe and a high-pressure water supply pipe; the low-pressure water supply pipe is provided with a low-pressure water supply pump and is connected with the water inlet end of the low-pressure waste heat boiler and the water inlet end of the medium-pressure waste heat boiler; and a high-pressure water feed pump is arranged at the high-pressure water feed pipe, and the high-pressure water feed pipe is connected with the water inlet end of the blast furnace gas boiler.
A condensate pipe of the condenser is provided with a condensate pump, and the condensate pipe is sequentially provided with a low-pressure heater, a low-pressure deaerator, a high-pressure deaerator and a high-pressure heater in the water flow direction.
The condenser is a water-cooling condenser, a cooling water outlet pipe of the water-cooling condenser is communicated with a water inlet end of the cooling tower, and a water outlet end of the cooling tower is connected with a cooling water inlet pipe of the water-cooling condenser through a circulating water pump.
The working method of the subcritical residual energy waste heat recovery power generation system of the steel plant comprises the following steps;
step A1, setting steam parameters of the blast furnace gas boiler as a subcritical ultrahigh-temperature boiler, namely setting the steam pressure of the output steam of the blast furnace gas boiler to be 17.4MPa or above and setting the steam temperature to be 571 ℃ or above; setting the steam exhaust pressure of a high-pressure cylinder of a steam turbine to be consistent with the steam pressure generated by a medium-pressure waste heat boiler in a steel plant; setting the steam pressure output by the medium-pressure waste heat boiler to be close to or equal to 20% of the steam pressure output by the blast furnace gas boiler;
step A2, feeding subcritical ultra-high temperature steam of the blast furnace gas boiler into a high-pressure cylinder of a steam turbine, driving the steam turbine to work, converting the steam into superheated medium-pressure steam, and feeding the superheated medium-pressure steam to a reheater of the blast furnace gas boiler; the superheated medium-pressure steam generated by the medium-pressure waste heat boiler is sent to a medium-pressure reheater of the blast furnace gas boiler, and the medium-pressure steam subjected to reheating treatment by the medium-pressure reheater is sent to a low-pressure condensing steam turbine;
a3, if the low-pressure steam pressure generated by the low-pressure waste heat boiler reaches the pressure range of 0.3-1.0MPa, sending the part of low-pressure steam to a low-pressure superheater of the blast-furnace gas boiler, and sending the part of low-pressure steam to a steam supplementing port of a low-pressure cylinder of a steam turbine after heat treatment;
step A4, driving the low-pressure cylinder to do work by the medium-pressure steam and the low-pressure steam sent to the low-pressure cylinder of the steam turbine, converting the low-pressure cylinder into exhaust steam and sending the exhaust steam to a condenser, cooling the exhaust steam by the condenser to form condensed water, and sending the condensed water to a thermal deaerator by a condensed water pump; the cooling mode of the exhaust steam at the condenser is circulating water cooling, low-temperature water required by the circulating water cooling is sent to the condenser through a circulating water pump, and the low-temperature water is changed into high-temperature water and sent to a cooling tower for cooling after absorbing the latent heat of the exhaust steam;
step A5, dividing the hot water formed by deoxidizing the condensed water through a low-pressure thermal deaerator into two paths for output; one path is pumped to a medium-pressure waste heat boiler and a low-pressure waste heat boiler by a low-pressure feed water pump; the other route is pumped to a high-pressure deaerator by a relay water pump for processing and then is pumped to a blast furnace gas boiler by a high-pressure feed water pump.
A turbine heat regenerative system is arranged at the water supply pipe and the condensed water pipe; the steam turbine heat regeneration system can evaluate the utilization condition of the heat regeneration of the steam turbine, and the arrangement of the high-pressure heater and the low-pressure heater is utilized to improve the return water temperature of the water supply pipe.
Compared with the prior art, the invention has the following beneficial effects: the invention relates to a working principle of a subcritical complementary energy waste heat recovery power generation system in a steel plant.A subcritical ultrahigh-temperature steam generated by a blast furnace gas boiler is sent to a high-pressure cylinder of a steam turbine and is changed into medium-pressure superheated steam after acting; the middle-pressure superheated steam exhausted by the high-pressure cylinder of the steam turbine and the middle-pressure steam generated by the middle-pressure waste heat boiler enter the low-pressure cylinder of the steam turbine after being reheated, and the low-pressure steam is sent to a steam supplementing port of the low-pressure cylinder of the steam turbine after being superheated.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic of the present invention;
in the figure: 1-blast furnace gas boiler; 2-a medium-pressure exhaust-heat boiler; 3-low pressure exhaust-heat boiler; 4-a medium pressure reheater; 5-low pressure superheater; 6-high pressure cylinder of steam turbine; 7-a low pressure cylinder of a steam turbine; 8-a generator; 9-a condenser; 10-a condensate pump; 11-a cooling tower; 12-a circulating water pump; 13-a low pressure heater; 14-a low pressure deaerator; 15-low pressure feed pump; 16-a relay water pump; 17-a high pressure deaerator; 18-high pressure feed pump; 19-high pressure heater.
Detailed Description
As shown in fig. 1, the subcritical residual energy waste heat recovery power generation system of the iron and steel plant is used for recovering valuable waste heat steam generated by a boiler of the iron and steel plant to a condensing steam turbine set for power generation, wherein the boiler comprises a blast furnace gas boiler 1 for generating subcritical ultrahigh-temperature steam, a medium-pressure waste heat boiler 2 for generating medium-pressure superheated steam, and a low-pressure waste heat boiler 3 for generating low-pressure superheated steam or low-pressure saturated steam;
the steam turbine in the condensation-compensating type steam turbine set comprises a condensation-compensating steam turbine comprising a high pressure cylinder and a condensation-compensating type low pressure cylinder; the main steam output end of the blast furnace gas boiler is communicated with a high-pressure cylinder 6 of a steam-supplementing condensing steam turbine;
the blast furnace gas boiler is provided with a medium-pressure reheater 4 and a low-pressure superheater 5;
the input end of the medium-pressure reheater is communicated with the medium-pressure superheated steam output end of the medium-pressure waste heat boiler and the steam exhaust end of the high-pressure cylinder of the steam-supplementing condensing steam turbine to receive steam; the steam input into the intermediate-pressure reheater is sent to a low-pressure cylinder 7 of the steam turbine after being reheated;
the input end of the low-pressure superheater is communicated with the output end of the low-pressure waste heat boiler for outputting low-pressure superheated steam or low-pressure saturated steam; the steam input into the low-pressure superheater is sent to a steam supplementing port of a steam turbine after being subjected to heat treatment;
the steam output end of the steam supplementing and condensing steam turbine is connected with the steam inlet end of a condenser 9; a condensed water pipe of the condenser is communicated with the medium-pressure waste heat boiler and the blast furnace gas boiler through a water supply pipe; and a low-pressure heater and a high-pressure heater for heating water flow in the pipe are arranged at the water supply pipe.
The medium-pressure waste heat boiler comprises a sintering device of an iron and steel plant, a rotary hearth furnace and a waste heat boiler configured in a dry quenching process; the low-pressure waste heat boiler comprises a sintering circular cooler, a converter, a vaporization heating furnace and a waste heat boiler configured in a pelletizing process of an iron and steel plant.
The turbine set is used for driving the generator 8;
when the steam turbine is a steam supplementing and condensing steam turbine, power output shafts of a high pressure cylinder and a low pressure cylinder for driving the generator are coaxial;
when the steam turbine unit further comprises a subcritical steam turbine, the subcritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine are split, and the subcritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine respectively drive different generators.
The water supply pipes comprise a low-pressure water supply pipe and a high-pressure water supply pipe; the low-pressure water supply pipe is provided with a low-pressure water supply pump 15 and is connected with the water inlet end of the low-pressure waste heat boiler and the water inlet end of the medium-pressure waste heat boiler; and a high-pressure water feed pump 18 is arranged at the high-pressure water feed pipe, and the high-pressure water feed pipe is connected with the water inlet end of the blast furnace gas boiler.
A condensate water pump is arranged at a condensate pipe of the condenser, and a low-pressure heater 13, a low-pressure deaerator 14, a high-pressure deaerator 17 and a high-pressure heater 19 are sequentially arranged on the condensate pipe in the water flow direction.
The condenser is a water-cooling condenser, a cooling water outlet pipe of the water-cooling condenser is communicated with a water inlet end of the cooling tower 11, and a water outlet end of the cooling tower is connected with a cooling water inlet pipe of the water-cooling condenser through a circulating water pump 12.
The working method of the subcritical residual energy waste heat recovery power generation system of the steel plant comprises the following steps;
step A1, setting steam parameters of the blast furnace gas boiler as a subcritical ultrahigh-temperature boiler, namely setting the steam pressure of the output steam of the blast furnace gas boiler to be 17.4MPa or above and setting the steam temperature to be 571 ℃ or above; setting the steam exhaust pressure of a high-pressure cylinder of a steam turbine to be consistent with the steam pressure generated by a medium-pressure waste heat boiler in a steel plant; setting the steam pressure output by the medium-pressure waste heat boiler to be close to or equal to 20% of the steam pressure output by the blast furnace gas boiler;
step A2, feeding subcritical ultra-high temperature steam of the blast furnace gas boiler into a high-pressure cylinder of a steam turbine, driving the steam turbine to work, converting the steam into superheated medium-pressure steam, and feeding the superheated medium-pressure steam to a reheater of the blast furnace gas boiler; the superheated medium-pressure steam generated by the medium-pressure waste heat boiler is sent to a medium-pressure reheater of the blast furnace gas boiler, and the medium-pressure steam subjected to reheating treatment by the medium-pressure reheater is sent to a low-pressure condensing steam turbine;
a3, if the low-pressure steam pressure generated by the low-pressure waste heat boiler reaches the pressure range of 0.3-1.0MPa, sending the part of low-pressure steam to a low-pressure superheater of the blast-furnace gas boiler, and sending the part of low-pressure steam to a steam supplementing port of a low-pressure cylinder of a steam turbine after heat treatment;
step A4, driving the low-pressure cylinder to do work by the medium-pressure steam and the low-pressure steam sent to the low-pressure cylinder of the steam turbine, converting the low-pressure cylinder into exhaust steam and sending the exhaust steam to a condenser, cooling the exhaust steam by the condenser to form condensed water, and sending the condensed water to a thermal deaerator by a condensed water pump; the cooling mode of the exhaust steam at the condenser is circulating water cooling, low-temperature water required by the circulating water cooling is sent to the condenser through a circulating water pump, and the low-temperature water is changed into high-temperature water and sent to a cooling tower for cooling after absorbing the latent heat of the exhaust steam;
step A5, dividing the hot water formed by deoxidizing the condensed water through a low-pressure thermal deaerator into two paths for output; one path is pumped to a medium-pressure waste heat boiler and a low-pressure waste heat boiler by a low-pressure feed water pump; the other route is pumped to a high-pressure deaerator by a relay water pump for processing and then is pumped to a blast furnace gas boiler by a high-pressure feed water pump.
A turbine heat regenerative system is arranged at the water supply pipe and the condensed water pipe; the steam turbine heat regeneration system can evaluate the utilization condition of the heat regeneration of the steam turbine, and the arrangement of the high-pressure heater and the low-pressure heater is utilized to improve the return water temperature of the water supply pipe.
In this example, the low pressure heater 13 and the high pressure heater 18 may be configured in one or more stages to meet the requirement of heating the feedwater.
The steam pressure in this example is generally set to three types: the main steam generated by blast furnace gas has parameters of subcritical ultrahigh temperature (and above parameters); medium-pressure steam, which is mainly the medium-pressure steam generated by the high-pressure cylinder exhaust steam of a steam turbine and a medium-pressure boiler, and the medium-pressure steam generated by a waste heat boiler with the parameter of main steam pressure, wherein the pressure is about 20 percent of the main steam pressure; and thirdly, low-pressure steam, mainly low-pressure steam generated by a low-pressure waste heat boiler, with the pressure of 0.3-1.0 MPa. After the subcritical ultrahigh-temperature steam enters a high-pressure cylinder of the steam turbine, the exhausted steam and medium-pressure steam generated by a medium-pressure boiler are reheated by a blast furnace gas boiler and then sent to a low-pressure cylinder of the steam turbine to continuously do work. The low-pressure steam is sent to the low-pressure cylinder of the steam turbine in a steam supplementing mode after being superheated.
Therefore, the heat engine combination modes of the waste heat boilers with different pressure grades, the reheaters with different pressure grades, the superheaters, the steam turbines with different pressures and steam admission in a main steam or steam supplementing mode derived from the invention belong to the protection scope of the invention.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the invention of "overall power generation, energy level matching, high energy utilization, temperature matching", it is intended to cover the scope of the claimed invention.
Claims (8)
1. Subcritical complementary energy waste heat recovery power generation system of steel plant for the waste heat steam recovery to the formula of recondensing steam turbine unit electricity generation that the boiler of steel plant produced has the value, its characterized in that: the boiler comprises a blast furnace gas boiler for generating subcritical ultrahigh-temperature steam, a medium-pressure waste heat boiler for generating medium-pressure superheated steam and a low-pressure waste heat boiler for generating low-pressure superheated steam or low-pressure saturated steam;
the steam turbine in the condensation-compensating type steam turbine set comprises a condensation-compensating steam turbine comprising a high pressure cylinder and a condensation-compensating type low pressure cylinder; the main steam output end of the blast furnace gas boiler is communicated with a high-pressure cylinder of a steam-supplementing condensing steam turbine;
the blast furnace gas boiler is provided with a medium-pressure reheater and a low-pressure superheater;
the input end of the medium-pressure reheater is communicated with the medium-pressure superheated steam output end of the medium-pressure waste heat boiler and the steam exhaust end of the high-pressure cylinder of the steam-supplementing condensing steam turbine to receive steam; the steam input into the intermediate-pressure reheater is sent to a low-pressure cylinder of a steam turbine after being reheated;
the input end of the low-pressure superheater is communicated with the output end of the low-pressure waste heat boiler for outputting low-pressure superheated steam or low-pressure saturated steam; the steam input into the low-pressure superheater is sent to a steam supplementing port of a steam turbine after being subjected to heat treatment;
the steam output end of the steam supplementing and condensing steam turbine is connected with the steam inlet end of the condenser; a condensed water pipe of the condenser is communicated with the medium-pressure waste heat boiler and the blast furnace gas boiler through a water supply pipe; and a low-pressure heater and a high-pressure heater for heating water flow in the pipe are arranged at the water supply pipe.
2. The subcritical residual energy waste heat recovery power generation system of the steel plant according to claim 1, characterized in that: the medium-pressure waste heat boiler comprises a sintering device of an iron and steel plant, a rotary hearth furnace and a waste heat boiler configured in a dry quenching process; the low-pressure waste heat boiler comprises a sintering circular cooler, a converter, a vaporization heating furnace and a waste heat boiler configured in a pelletizing process of an iron and steel plant.
3. The subcritical residual energy waste heat recovery power generation system of the steel plant according to claim 1, characterized in that: the steam turbine set is used for driving a generator;
when the steam turbine is a steam supplementing and condensing steam turbine, power output shafts of a high pressure cylinder and a low pressure cylinder for driving the generator are coaxial;
when the steam turbine unit further comprises a subcritical steam turbine, the subcritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine are split, and the subcritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine respectively drive different generators.
4. The subcritical residual energy waste heat recovery power generation system of the steel plant according to claim 1, characterized in that: the water supply pipes comprise a low-pressure water supply pipe and a high-pressure water supply pipe; the low-pressure water supply pipe is provided with a low-pressure water supply pump and is connected with the water inlet end of the low-pressure waste heat boiler and the water inlet end of the medium-pressure waste heat boiler; and a high-pressure water feed pump is arranged at the high-pressure water feed pipe, and the high-pressure water feed pipe is connected with the water inlet end of the blast furnace gas boiler.
5. The subcritical residual energy waste heat recovery power generation system of the steel plant according to claim 4, characterized in that: a condensate pipe of the condenser is provided with a condensate pump, and the condensate pipe is sequentially provided with a low-pressure heater, a low-pressure deaerator, a high-pressure deaerator and a high-pressure heater in the water flow direction.
6. The subcritical residual energy waste heat recovery power generation system of the steel plant according to claim 5, characterized in that: the condenser is a water-cooling condenser, a cooling water outlet pipe of the water-cooling condenser is communicated with a water inlet end of the cooling tower, and a water outlet end of the cooling tower is connected with a cooling water inlet pipe of the water-cooling condenser through a circulating water pump.
7. The working method of the subcritical complementary energy waste heat recovery power generation system of the steel plant is characterized by comprising the following steps: the subcritical residual energy waste heat recovery power generation system of the steel plant according to claim 5, wherein the working method comprises the following steps;
step A1, setting steam parameters of the blast furnace gas boiler as a subcritical ultrahigh-temperature boiler, namely setting the steam pressure of the output steam of the blast furnace gas boiler to be 17.4MPa or above and setting the steam temperature to be 571 ℃ or above; setting the steam exhaust pressure of a high-pressure cylinder of a steam turbine to be consistent with the steam pressure generated by a medium-pressure waste heat boiler in a steel plant; setting the steam pressure output by the medium-pressure waste heat boiler to be close to or equal to 20% of the steam pressure output by the blast furnace gas boiler;
step A2, feeding subcritical ultra-high temperature steam of the blast furnace gas boiler into a high-pressure cylinder of a steam turbine, driving the steam turbine to work, converting the steam into superheated medium-pressure steam, and feeding the superheated medium-pressure steam to a reheater of the blast furnace gas boiler; the superheated medium-pressure steam generated by the medium-pressure waste heat boiler is sent to a medium-pressure reheater of the blast furnace gas boiler, and the medium-pressure steam subjected to reheating treatment by the medium-pressure reheater is sent to a low-pressure condensing steam turbine;
a3, if the low-pressure steam pressure generated by the low-pressure waste heat boiler reaches the pressure range of 0.3-1.0MPa, sending the part of low-pressure steam to a low-pressure superheater of the blast-furnace gas boiler, and sending the part of low-pressure steam to a steam supplementing port of a low-pressure cylinder of a steam turbine after heat treatment;
step A4, driving the low-pressure cylinder to do work by the medium-pressure steam and the low-pressure steam sent to the low-pressure cylinder of the steam turbine, converting the low-pressure cylinder into exhaust steam and sending the exhaust steam to a condenser, cooling the exhaust steam by the condenser to form condensed water, and sending the condensed water to a thermal deaerator by a condensed water pump; the cooling mode of the exhaust steam at the condenser is circulating water cooling, low-temperature water required by the circulating water cooling is sent to the condenser through a circulating water pump, and the low-temperature water is changed into high-temperature water and sent to a cooling tower for cooling after absorbing the latent heat of the exhaust steam;
step A5, dividing the hot water formed by deoxidizing the condensed water through a low-pressure thermal deaerator into two paths for output; one path is pumped to a medium-pressure waste heat boiler and a low-pressure waste heat boiler by a low-pressure feed water pump; the other route is pumped to a high-pressure deaerator by a relay water pump for processing and then is pumped to a blast furnace gas boiler by a high-pressure feed water pump.
8. The operating method of the subcritical residual energy waste heat recovery power generation system of the steel plant according to claim 7, characterized by comprising the following steps: a turbine heat regenerative system is arranged at the water supply pipe and the condensed water pipe; the steam turbine heat regeneration system can evaluate the utilization condition of the heat regeneration of the steam turbine, and the arrangement of the high-pressure heater and the low-pressure heater is utilized to improve the return water temperature of the water supply pipe.
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| CN112627922A (en) * | 2020-12-16 | 2021-04-09 | 攀钢集团攀枝花钢钒有限公司 | Metallurgical waste heat steam power generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627922A (en) * | 2020-12-16 | 2021-04-09 | 攀钢集团攀枝花钢钒有限公司 | Metallurgical waste heat steam power generation system |
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