CN114517717A - Ultra-supercritical complementary energy waste heat cooperative power generation system for steel plant and working method thereof - Google Patents

Ultra-supercritical complementary energy waste heat cooperative power generation system for steel plant and working method thereof Download PDF

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Publication number
CN114517717A
CN114517717A CN202210308843.2A CN202210308843A CN114517717A CN 114517717 A CN114517717 A CN 114517717A CN 202210308843 A CN202210308843 A CN 202210308843A CN 114517717 A CN114517717 A CN 114517717A
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China
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pressure
steam
low
waste heat
ultra
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CN202210308843.2A
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Inventor
方桂平
许建芬
毛奇洲
陈绍凤
林金辉
简永强
彭龙
黄湫
兰贵琴
刘佳琦
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Fu Jian Province Dong Guo Energy Saving Technology Co ltd
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Fu Jian Province Dong Guo Energy Saving Technology Co ltd
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Priority to CN202210308843.2A priority Critical patent/CN114517717A/en
Publication of CN114517717A publication Critical patent/CN114517717A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
    • F01K27/02—Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
    • 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
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B29/00—Steam boilers of forced-flow type
    • F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
    • F22B29/067—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes operating at critical or supercritical pressure
    • 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
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22G—SUPERHEATING OF STEAM
    • F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof

Abstract

The invention provides an ultra-supercritical residual energy and waste heat collaborative power generation system of an iron and steel plant and a working method thereof, which are used for recovering waste heat steam with a useful value 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 ultra-supercritical ultra-high temperature steam, a medium-pressure waste heat boiler for generating medium-pressure superheated steam, a low-pressure waste heat boiler for generating low-pressure superheated steam or low-pressure saturated steam, a medium-pressure steam superheating device and a low-pressure steam superheating device; the ultra-supercritical ultra-high temperature steam generated by the blast furnace gas boiler is sent to a high-pressure cylinder of a steam turbine and becomes 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 waste heat of the steel plant.

Description

Ultra-supercritical complementary energy waste heat cooperative power generation system of steel plant and working method thereof
Technical Field
The invention relates to the technical field of power generation, in particular to an ultra-supercritical residual energy waste heat recovery cooperative 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 an ultra-supercritical residual energy and waste heat cooperative 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 and 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 ultra-supercritical complementary energy waste heat collaborative power generation system of the steel plant is used for recovering waste heat steam with a utilization value generated by a boiler of the steel plant to a complementary condensing type steam turbine unit for power generation, wherein the boiler comprises a blast furnace gas boiler generating ultra-supercritical ultra-high temperature steam, a medium-pressure waste heat boiler generating medium-pressure superheated steam, a low-pressure waste heat boiler generating low-pressure superheated steam or low-pressure saturated steam, a medium-pressure steam superheating device and a low-pressure steam superheating device.
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 ultrahigh-pressure ultrahigh-temperature blast furnace gas boiler is communicated with a high-pressure cylinder of a steam-supplementing condensing steam turbine; the high-pressure cylinder exhaust steam is communicated with the input end of a reheater of the ultra-supercritical ultra-high temperature gas boiler; the output end of the reheater of the ultra-supercritical ultra-high temperature gas boiler is communicated with the steam inlet of the low pressure cylinder of the condensing steam turbine.
The input end of the medium-pressure steam superheating device is communicated with the medium-pressure superheated steam output end of the medium-pressure waste heat boiler; the output end of the medium-pressure steam superheating device is communicated with a first steam supplementing port of a low-pressure cylinder of the condensing steam turbine.
The input end of the low-pressure steam superheating device 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 output end of the low-pressure steam superheating device is communicated with a second steam supplementing port of the condensing steam turbine.
The steam output end of the steam supplementing and condensing steam turbine is connected with the steam inlet end of the condenser; and 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 an ultra-supercritical steam turbine, the ultra-supercritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine can be coaxial or split, and the ultra-supercritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine can drive the same generator and can also drive two generators respectively.
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 ultra-supercritical residual energy waste heat collaborative power generation system of the steel plant comprises the following steps;
step A1, setting steam parameters of the blast furnace gas boiler as an ultra-supercritical ultra-high temperature boiler, namely the steam pressure of the output steam of the blast furnace gas boiler reaches 28MPa or above, and the steam temperature reaches 571 ℃ or above;
step A2, feeding the ultra-supercritical 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; superheated medium-pressure steam generated by the medium-pressure waste heat boiler is sent to a medium-pressure steam superheating device, and the medium-pressure steam subjected to superheating treatment by the medium-pressure steam superheating device is conveyed to a first steam supplementing port of a low-pressure cylinder of the 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 steam superheating device, and sending the part of low-pressure steam to a second steam supplementing port of a low-pressure cylinder of the condensing 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: according to the working principle of the ultra-supercritical complementary energy waste heat cooperative power generation system of the steel plant, ultra-supercritical ultra-high-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 medium-pressure superheated steam exhausted by the high-pressure cylinder of the steam turbine enters the low-pressure cylinder of the steam turbine after being reheated, and the medium-pressure steam and the low-pressure steam are respectively sent to two steam supplementing ports of the low-pressure cylinder of the steam turbine after being superheated.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram 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-medium pressure steam superheating means; 5-low pressure steam superheating means; 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 ultra-supercritical residual energy and waste heat collaborative power generation system of the steel plant is used for recovering waste heat steam with a use value generated by a boiler of the steel plant to a condensing steam turbine set for power generation, wherein the boiler comprises a blast furnace gas boiler 1 for generating ultra-supercritical ultra-high temperature steam, a medium-pressure waste heat boiler 2 for generating medium-pressure superheated steam, a low-pressure waste heat boiler 3 for generating low-pressure superheated steam or low-pressure saturated steam, a medium-pressure steam superheating device 4 and a low-pressure steam superheating device 5.
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; and the main steam output end of the blast furnace gas boiler is communicated with the high-pressure cylinder 6 of the steam-supplementing condensing turbine.
The input end of the medium-pressure steam superheating device is communicated with the medium-pressure superheated steam output end of the medium-pressure waste heat boiler; the steam input into the medium-pressure steam superheating device is subjected to heat treatment and then is sent to a first steam supplementing opening of a low-pressure cylinder of the steam turbine.
The input end of the low-pressure steam superheating device is communicated with the output end of the low-pressure waste heat boiler for outputting low-pressure superheated steam or low-pressure saturated steam; and the steam input into the low-pressure steam superheating device is subjected to heat treatment and then is sent to a second steam supplementing port of the steam turbine.
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 an ultra-supercritical steam turbine, the ultra-supercritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine can be coaxial or split, and the ultra-supercritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine can drive the same generator and can also drive different generators respectively.
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 ultra-supercritical residual energy waste heat collaborative power generation system of the steel plant comprises the following steps;
step A1, setting steam parameters of the blast furnace gas boiler as an ultra-supercritical ultra-high temperature boiler, namely, the steam pressure of the output steam of the blast furnace gas boiler reaches 28MPa or more and the steam temperature reaches 571 ℃ or more;
step A2, feeding the ultra-supercritical 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; superheated medium-pressure steam generated by the medium-pressure waste heat boiler is sent to a medium-pressure steam reheating device, and the medium-pressure steam subjected to overheating treatment by the medium-pressure steam reheating device is conveyed to a first steam supplementing opening of a low-pressure cylinder of the 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 steam superheating device, and sending the part of low-pressure steam to a second steam supplementing port of a low-pressure cylinder of the condensing 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: firstly, main steam generated by blast furnace gas has parameters of ultra-supercritical ultra-high temperature (and above parameters); the medium-pressure steam is mainly exhausted by a high-pressure cylinder of a steam turbine and medium-pressure steam generated by a medium-pressure boiler; 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 ultra-supercritical ultra-high temperature steam enters a high-pressure cylinder of the steam turbine, exhaust steam is reheated in a blast furnace gas boiler and then sent to a low-pressure cylinder of the steam turbine to continuously do work. Medium-pressure steam generated by the medium-pressure boiler is superheated by the medium-pressure steam superheating device and then is sent to a first steam supplementing port of a low-pressure cylinder of the steam turbine in a steam supplementing mode; and after being superheated, the low-pressure steam is sent to a second steam supplementing port of the low-pressure cylinder of the steam turbine in a steam supplementing mode.
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 solution of the present invention and not to limit it; 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 (7)

1. Ultra supercritical complementary energy waste heat collaborative 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 of utilization, its characterized in that:
the boiler comprises a blast furnace gas boiler for generating ultra-supercritical ultra-high temperature steam, a medium-pressure waste heat boiler for generating medium-pressure superheated steam, a low-pressure waste heat boiler for generating low-pressure superheated steam or low-pressure saturated steam, a medium-pressure steam superheating device and a low-pressure steam superheating device;
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 steam inlet of a steam-supplementing condensing steam turbine;
the input end of the medium-pressure steam superheating device is communicated with the medium-pressure superheated steam output end of the medium-pressure waste heat boiler; the steam input into the medium-pressure steam superheating device is subjected to heat treatment and then is sent to a first steam supplementing port of a low-pressure cylinder of the steam turbine;
the input end of the low-pressure steam superheating device 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 steam superheating device is subjected to heat treatment and then is sent to a second steam supplementing port of the steam turbine;
the steam output end of the steam supplementing and condensing 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 ultra-supercritical complementary energy waste heat cooperative 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 ultra-supercritical complementary energy waste heat cooperative 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 set further comprises an ultra supercritical steam turbine, the ultra supercritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine can be coaxial or split, and the ultra supercritical steam turbine high-pressure cylinder and the steam-supplementing condensing steam turbine can drive different generators and can also drive the same generator coaxially.
4. The ultra-supercritical complementary energy waste heat cooperative 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 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 ultra-supercritical blast furnace gas boiler.
5. The ultra-supercritical complementary energy waste heat cooperative 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 working method of the ultra-supercritical complementary energy waste heat cooperative power generation system of the steel plant is characterized by comprising the following steps: the ultra-supercritical residual energy and waste heat cooperative 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 an ultra-supercritical ultra-high temperature boiler, namely the steam pressure of the output steam of the blast furnace gas boiler reaches 28MPa or above, and the steam temperature reaches 571 ℃ or above;
step A2, feeding the ultra-supercritical 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; superheated medium-pressure steam generated by the medium-pressure waste heat boiler is sent to a medium-pressure steam superheating device, and the superheated medium-pressure steam is conveyed to a first steam supplementing port of a low-pressure cylinder of the steam supplementing 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 steam superheating device, and sending the part of low-pressure steam to a second steam supplementing port of a low-pressure cylinder of the steam supplementing and condensing 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; and the other route is pumped to a high-pressure deaerator by a relay water pump for treatment and then is pumped to the ultra-supercritical blast furnace gas boiler by a high-pressure feed water pump.
7. The working method of the ultra-supercritical residual energy and waste heat cooperative power generation system of the steel plant according to claim 6 is characterized in that: 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.
CN202210308843.2A 2022-03-28 2022-03-28 Ultra-supercritical complementary energy waste heat cooperative power generation system for steel plant and working method thereof Withdrawn CN114517717A (en)

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