CN219103729U - Coupling power generation system is retrieved to converter flue gas waste heat high efficiency - Google Patents
Coupling power generation system is retrieved to converter flue gas waste heat high efficiency Download PDFInfo
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- CN219103729U CN219103729U CN202222889295.5U CN202222889295U CN219103729U CN 219103729 U CN219103729 U CN 219103729U CN 202222889295 U CN202222889295 U CN 202222889295U CN 219103729 U CN219103729 U CN 219103729U
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Abstract
The utility model discloses a converter flue gas waste heat efficient recovery coupling power generation system, which belongs to the field of waste heat and waste energy utilization, and comprises the following components: the converter flue gas waste heat recovery system, the steam power generation system and the coupling component, wherein the coupling component comprises a high-temperature heat storage tank and a low-temperature water storage tank; the converter flue gas waste heat recovery system comprises an evaporative cooler, a steam drum and a deaerator; the converter flue gas waste heat recovery system and the steam power generation system are coupled in a mode that condensation water is extracted from the tail end of a condenser of the steam power generation system and is cached in a low-temperature water storage tank, after deoxidization, the condensation water is injected into a steam drum, water working medium absorbs waste heat of converter flue gas in an evaporative cooler to generate steam, the steam enters the steam drum, then the steam is introduced into a high-temperature heat storage tank, and steam or hot water is extracted from the high-temperature heat storage tank, pressurized and then injected into a steam-water system of the steam power generation system; the mixed working medium absorbs heat in a steam power generation system boiler to generate steam, and the steam power generation system boiler sequentially passes through a steam turbine and a generator to generate power efficiently. The utility model runs continuously, has high residual heat utilization rate and low construction cost.
Description
Technical Field
The utility model relates to the field of industrial waste heat and residual energy utilization, in particular to a converter flue gas waste heat efficient recovery coupling power generation system.
Background
Converter steelmaking is the main steelmaking mode in China and accounts for more than 85% of all steelmaking modes. The converter steelmaking can generate a large amount of high-temperature flue gas, the temperature is between 1450 and 1600 ℃, and the high-grade waste heat resource is realized. In order to recycle the waste heat of converter flue gas, an OG wet dust removal system and an LT dry dust removal system which are commonly adopted for the converter flue gas at home and abroad are used for spraying water or steam to the converter gas at about 800 ℃ at the outlet of a converter waste heat boiler, so that the flue gas is rapidly cooled to about 200 ℃. Therefore, a large amount of sensible heat in the medium temperature section of 200-800 ℃ in the converter gas cannot be recycled, energy is wasted, and consumption of water and steam is increased. With the improvement of national energy conservation and emission reduction policy standards in recent years, in order to fully recycle and utilize waste heat resources below 800 ℃ at the converter outlet, a large number of students at home and abroad perform design and research on a low-temperature waste heat recovery process in converter flue gas, and industrial practice is successfully performed in steel plants. Most of waste heat of converter flue gas can be fully recovered by adopting the current latest converter flue gas deep cooling system, and the temperature of outlet flue gas can be controlled at about 200 ℃.
Although the prior art can realize the recovery of most of waste heat of converter flue gas, the utilization of the waste heat of the converter flue gas still has the following defects: 1) Because of the discontinuity of converter steelmaking, the waste heat utilization mode can only adopt a heat accumulator to provide saturated steam and hot water for heat users, and the effective utilization rate and the utilization grade of the waste heat are not high; 2) The use of steam and hot water has seasonal characteristics, and a large amount of water and steam are abandoned in summer; 3) The steam is utilized to generate power, the initial investment of the complete power generation system equipment is too high, and the parameters of a generator set are low, the start and stop are frequent and the waste heat power generation efficiency is low due to the discontinuous characteristic of the converter steelmaking.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art, provides a converter flue gas waste heat efficient recovery coupling power generation system, and solves the problems that the existing converter flue gas waste heat recovery power generation system cannot continuously operate, the waste heat utilization rate is low, the construction cost is high in one-boiler-one-machine mode, the conventional converter flue gas waste heat power generation efficiency is low and the like.
The utility model aims at realizing the following scheme:
a converter flue gas waste heat high-efficiency recovery coupling power generation system comprises: the converter flue gas waste heat recovery system, the steam power generation system and the coupling component, wherein the coupling component comprises a high-temperature heat storage tank and a low-temperature water storage tank;
the converter flue gas waste heat recovery system comprises an evaporative cooler, a steam drum and a deaerator;
the converter flue gas waste heat recovery system and the steam power generation system are coupled in a mode that condensed water is extracted from the tail end of a condenser of the steam power generation system, cached in the low-temperature water storage tank, deoxidized by a deoxidizer and then injected into the steam drum, water working medium absorbs waste heat of converter flue gas in the evaporative cooler and generates steam which enters the steam drum, the steam is introduced into the high-temperature heat storage tank, and steam is extracted from the high-temperature heat storage tank or hot water is injected into a steam-water system of the steam power generation system after being pressurized; the mixed working medium absorbs heat in a steam power generation system boiler to generate steam, and the steam power generation system boiler sequentially passes through a steam turbine and a generator to generate power efficiently.
Further, the low-temperature water extracted from the steam power generation system enters the converter waste heat recovery system for heating, enters the high-temperature heat storage tank, and further returns to the steam power generation system.
Further, the pressure of the high-temperature hot water or steam side generated by the converter flue gas waste heat recovery system is higher than the minimum pressure required by the injection of the water system meeting the steam turbine.
Further, an inlet of the low-temperature water storage tank is connected with a condensate pump, condensate water of the steam power generation system is received and buffered, an outlet of the low-temperature water storage tank is connected with a deaerator of the converter flue gas waste heat recovery system, and a flow measurement and control device and a shut-off valve are arranged behind the low-temperature water storage tank, so that the low-temperature water storage tank has flow buffering and measurement and control functions and is decoupled from the converter flue gas waste heat recovery system when the converter is stopped.
Further, the high-temperature heat storage tank and the low-temperature water storage tank are provided with redundancy in volume, so that the high-temperature heat storage tank can still keep constant flow output to the steam power generation system during intermittent operation of the converter, and the stable operation of the steam power generation system is ensured.
Further, the steam-water pipeline connection relation of the converter flue gas waste heat recovery system is as follows: the method comprises the steps that condensate is extracted from the tail end of a condenser of a steam power generation system, is buffered and controlled at the flow rate of a low-temperature water storage tank, and is deoxidized by a deoxidizer or the extracted condensate directly enters the deoxidizer, and enters a steam drum through a second water pump, water working medium is introduced into an evaporative cooler of a converter flue through a down pipe by the steam drum, steam is produced by evaporation of hot water in the evaporative cooler and is introduced into the steam drum through a riser, steam produced by steam-water separation in the steam drum enters a high-temperature heat storage tank, and hot water or steam is extracted in the high-temperature heat storage tank and is injected into a steam-water system in the steam power generation system through a first water pump.
Further, the outlet of the high-temperature heat storage tank is provided with a first water pump, the converter waste heat recovery system operates under a low-pressure working condition, and the first water pump is used for boosting water or steam led out of the heat storage tank to a steam-water system which is consistent with the working medium pressure of the steam power generation system and then is injected into the steam power generation system.
Further, the high-temperature heat storage tank is connected with the deaerator through a third water pump, the deaerator provides low-temperature water for the high-temperature heat storage tank through the third water pump, and working medium extracted from the high-temperature heat storage tank is hot water or steam; the hot water extracted from the high-temperature heat storage tank can be mixed with water fed from the inlet of the boiler, and also can be mixed with water fed from the outlet of any level of heat regenerator after the deaerator, and the extracted hot water or steam can be mixed with reheat steam and then enter the boiler to absorb heat.
Further, a high-temperature heat storage tank is arranged behind the steam drum, the high-temperature heat storage tank stores heat by adopting wet-type pressure transformation, the high-temperature heat storage tank continuously supplies hot water to the steam power generation system or steam is injected into the steam-water system of the boiler, and the heat of the heat storage tank is increased by the steam from the steam drum during converting of the converter, so that the enthalpy of the hot water is improved and the steam is supplemented; the inlet and outlet of the high-temperature heat storage tank are provided with a flow regulating valve and a shutoff valve, so that the flow of working medium injected into a boiler of the steam power generation system can be regulated in real time, and the shutoff valve is disconnected from the converter flue gas waste heat recovery system when the converter is stopped.
Further, the steam power generation system comprises a boiler, a steam turbine, a generator, a condenser, a water pump, a heat regenerator and a deaerator, superheated steam generated after the boiler heats feed water enters the steam turbine to do work and generate power through the generator, the boiler is a primary reheating system or a secondary reheating system, the steam turbine is provided with multistage air extraction to heat the feed water, and the condenser adopts a water cooling or air cooling mode.
The beneficial effects of the utility model include:
the utility model solves the problems that the existing converter flue gas waste heat recovery power generation system cannot continuously operate, the waste heat utilization rate is low, the construction cost of one boiler is high, and the conventional converter flue gas waste heat power generation efficiency is only 13-15%. The efficient recovery coupling power generation system structure based on the converter flue gas waste heat provided by the utility model is constructed through simulation, so that the matching relation between substances and energy is realized, and the power generation efficiency of the converter flue gas waste heat is more than 28%. The utility model improves the waste heat recovery amount and the waste heat power generation efficiency, so that the overall waste heat recovery efficiency of the scheme reaches about 4 times of the traditional converter flue gas waste heat recovery efficiency.
The implementation and the proposed operation strategy can realize long-term continuous and stable operation of the system under various complex working conditions, can be used for power generation, and can give consideration to heat utilization and steam utilization requirements in factories. Meanwhile, the requirement of increasing the generated energy can be met only by slightly modifying and constructing the generator set based on the existing steel mill, the initial equipment investment of the converter flue gas waste heat recovery power generation system is greatly reduced, and the technical and economic benefits are quite remarkable.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a coupling power generation system for efficiently recovering waste heat of converter flue gas provided in embodiment 1 of the present utility model;
fig. 2 is a schematic structural diagram of a coupling power generation system for efficiently recovering waste heat of flue gas of a converter according to embodiment 2 of the present utility model;
fig. 3 is a schematic structural diagram of a coupling power generation system for efficiently recovering waste heat of flue gas of a converter provided in embodiment 3 of the present utility model;
fig. 4 is a schematic structural diagram of a coupling power generation system for efficiently recovering waste heat of flue gas of a converter provided in embodiment 4 of the present utility model;
in the figure, a 1-1 converter, a 1-2-evaporative cooler, a 1-3-high temperature heat storage tank, a 1-4-first water pump, a 1-5-steam drum, a 1-6-low temperature water storage tank, a 1-7-first deaerator, a 1-8-second water pump, a 1-9-third water pump, a 2-1-boiler, a 2-2-steam turbine, a 2-3-generator, a 2-4-condenser, a 2-5-condensate pump, a 2-6-regenerator, a 2-7-second deaerator and a 2-8-feed pump.
Detailed Description
All the features disclosed in all the embodiments of the present description, except mutually exclusive features, may be combined and/or expanded, substituted in any way.
In order to overcome the defects that the existing converter flue gas waste heat utilization efficiency and utilization grade are low, a waste heat power generation system cannot continuously operate, one boiler is high in construction cost and the like, the embodiment of the utility model provides a converter flue gas waste heat efficient recovery coupling power generation system. The coupling operation of the converter flue gas waste heat recovery system and the steam power generation system can be realized by utilizing the existing generator set of the steel mill, and the efficient and stable recovery and utilization of the converter flue gas waste heat are realized.
The utility model provides a converter flue gas waste heat efficient recovery coupling power generation system, which comprises a converter flue gas waste heat recovery system, a steam power generation system and a coupling component, wherein the coupling component comprises a high-temperature heat storage tank, a low-temperature water storage tank, a heat accumulator and a connecting pipeline; the converter flue gas waste heat recovery system comprises an evaporative cooler, a steam drum and a deaerator; the converter flue gas waste heat recovery system is coupled with the steam power generation system in a mode that condensation water is extracted from the tail end of a condenser of the steam power generation system and buffered in the low-temperature water storage tank, deoxygenated by a deoxygenator and then injected into the steam drum, water working medium absorbs waste heat of converter flue gas in the evaporative cooler and generates steam which enters the steam drum and then is introduced into the high-temperature heat storage tank, and steam is extracted from the high-temperature heat storage tank or hot water is injected into a steam-water system of the steam power generation system after being pressurized; the mixed working medium absorbs heat in a steam power generation system boiler to generate steam, and the steam power generation system boiler sequentially passes through a steam turbine and a generator to generate power efficiently.
The operation process of the utility model is as follows: maintaining the steam parameters of the original steam generator set unchanged, extracting part of condensed water of a steam power generation system, heating the condensed water at low pressure through a converter flue gas waste heat recovery system, and then arranging a high-pressure water pump behind a high-temperature heat storage tank to pressurize the condensed water or steam with similar parameters to main steam or reheat steam and mix the saturated water or steam with low-temperature reheat steam, or mixing the heated condensed water with feed water after boosting, fully opening a steam turbine regulating valve, and realizing deep matching of system material flow and energy flow by regulating each stage of extraction flow of a steam turbine; or, variable operating mode: the flow of condensed water extracted from the steam power generation system is unchanged, so that converter flue gas can be deeply cooled under the same heat load, and the flow balance of a unit is realized by reducing the water supply flow of the steam power generation system and the outlet flow of the high-temperature heat storage tank and adjusting the extraction flow of each stage of the steam turbine; the converter flue gas waste heat recovery system and the steam power generation system are decoupled, an inlet valve of a deaerator of the converter flue gas waste heat recovery system and an outlet valve of the high-temperature heat storage tank are cut off, the steam generator set operates according to the design working condition, and the converter flue gas waste heat recovery system independently provides steam or hot water for heat users.
In a specific implementation process, the converter flue gas waste heat high-efficiency recovery coupling power generation system provided by the conception scheme of the utility model, as shown in figures 1, 2, 3 and 4, comprises a converter flue gas waste heat recovery system, a steam power generation system, a high-temperature heat storage tank 1-3, a low-temperature water storage tank 1-6 and a connecting pipeline. The converter flue gas waste heat recovery system comprises a converter 1-1, an evaporative cooler 1-2, a steam drum 1-5, a first deaerator 1-7 and the like. The steam power generation system comprises a boiler 2-1, a steam turbine 2-2, a generator 2-3, a condenser 2-4, a heat regenerator 2-6, a second deaerator 2-7 and the like. The converter flue gas waste heat recovery system and the steam power generation system are coupled in a mode that condensation water is extracted from the tail end of a condenser 2-4 of the steam power generation system and buffered in a low-temperature water storage tank 1-6, deoxygenated by a deoxygenator 1-7 and injected into a steam drum 1-5, water working medium absorbs waste heat of converter flue gas in an evaporative cooler 1-2 and generates steam, the steam enters the steam drum 1-5 and then is introduced into a high-temperature heat storage tank 1-3, and steam is extracted from the high-temperature heat storage tank 1-3 or hot water is injected into a steam-water system of the steam power generation system after being pressurized. The mixed working medium absorbs heat in a steam power generation system boiler 2-1 to generate steam, and the steam power generation system boiler sequentially passes through a steam turbine 2-2 and a generator 2-3 to generate power efficiently.
In the specific implementation process, in the actual operation process, the steam parameters of the original steam generator set are kept unchanged, part of condensed water of the steam power generation system is extracted, is heated by the flue gas of the converter 1-1 at low pressure, and then is pressurized to saturated water or steam with similar parameters to main steam or reheat steam (namely, the two types of steam or water quality are the same) by the high-pressure water pump after the high-temperature heat storage tank 1-3, and is mixed with low-temperature reheat steam, or the heated condensed water is mixed with water supply, the regulating valve of the steam turbine 2-2 is fully opened, and the deep matching of the material flow and the energy flow of the system is realized by regulating the extraction flow of each stage of the steam turbine 2-2. Under the variable working condition operation, the flow of condensed water extracted from the steam power generation system is unchanged, the deep cooling of the flue gas of the converter 1-1 under the same heat load is ensured, and the flow balance of the unit is realized by reducing the water supply flow of the steam power generation system and the outlet flow of the high-temperature heat storage tank 1-3 and adjusting the extraction flow of each stage of the steam turbine 2-2; the converter flue gas waste heat recovery system and the steam power generation system are decoupled, an inlet valve of a first deaerator 1-7 of the converter flue gas waste heat recovery system and an outlet valve of a high-temperature heat storage tank 1-3 are cut off, the steam generator set operates according to design working conditions, and the converter flue gas waste heat recovery system independently provides steam or hot water for heat users.
In the conception scheme of the utility model, an inlet of a low-temperature water storage tank 1-6 is connected with a condensate pump 2-5, condensate water of a steam power generation system is received and buffered, an outlet of the low-temperature water storage tank is connected with a first deaerator 1-7 of a converter flue gas waste heat recovery system, and a flow measurement and control device and a shut-off valve are arranged behind the low-temperature water storage tank 1-6, so that the low-temperature water storage tank has flow buffering and measurement and control functions and is decoupled with the converter flue gas waste heat recovery system when the converter 1-1 is stopped.
In the scheme of the utility model, the volumes of the high-temperature heat storage tank 1-3 and the low-temperature water storage tank 1-6 are considered to be provided with enough redundancy so as to ensure that the flow rate of the high-temperature heat storage tank 1-3 which can still be output to the steam power generation system is kept unchanged during the intermittent operation of the converter 1-1, and the operation stability of the steam power generation system is ensured.
Example 1
In an alternative embodiment of the present utility model, as shown in fig. 1, in example 1, based on the concept of the present utility model, the steam-water pipeline connection relationship of the flue gas waste heat recovery system of the converter is: the method comprises the steps of extracting condensation water from the tail end of a condenser 2-4 of a steam power generation system, caching and controlling flow in a low-temperature water storage tank 1-6, deoxidizing by a deoxidizer 1-7, entering a steam drum 1-5 after passing through a second water pump 1-8, leading water working medium into an evaporative cooler 1-2 of a converter flue by the steam drum 1-5 through a down pipe, leading steam generated by evaporation of hot water in the evaporative cooler 1-2 into the steam drum 1-5 through a rising pipe, leading the steam generated after steam-water separation in the steam drum 1-5 into a high-temperature heat storage tank 1-3, extracting hot water or steam in the high-temperature heat storage tank 1-3, pressurizing by the first water pump 1-4, mixing with reheat steam, absorbing heat in the boiler 2-1 and acting in a steam turbine 2-2.
Example 2
In an alternative embodiment, as shown in fig. 2, in example 2, based on the concept of the utility model, the steam-water pipeline connection relationship of the converter flue gas waste heat recovery system is: the method comprises the steps of extracting condensed water from the tail end of a condenser 2-4 of a steam power generation system, caching and controlling flow in a low-temperature water storage tank 1-6, deoxidizing by a first deaerator 1-7, feeding the deoxidized water into a steam drum 1-5 after passing through a second water pump 1-8, leading water working medium into an evaporative cooler 1-2 of a converter flue by the steam drum 1-5 through a down pipe, leading steam generated by evaporation of hot water in the evaporative cooler 1-2 into the steam drum 1-5 through a riser, leading the steam generated after steam-water separation in the steam drum 1-5 into a high-temperature heat storage tank 1-3, extracting hot water from the high-temperature heat storage tank 1-3, pressurizing by the first water pump 1-4, mixing the hot water with feed water at an inlet of a boiler 2-1, absorbing heat in the boiler 2-1, and doing work in a steam turbine 2-2.
Example 3
In an alternative embodiment, as shown in fig. 3, in example 3, based on the concept of the utility model, the steam-water pipeline connection relationship of the converter flue gas waste heat recovery system is: the method comprises the steps of extracting condensate water from the tail end of a condenser 2-4 of a steam power generation system, caching and controlling flow in a low-temperature water storage tank 1-6, deoxidizing by a first deaerator 1-7, feeding the condensate water into a steam drum 1-5 after passing through a second water pump 1-8, introducing water working medium into an evaporative cooler 1-2 of a converter flue by the steam drum 1-5 through a downcomer, evaporating hot water to generate steam in the evaporative cooler 1-2, introducing the steam into the steam drum 1-5 through a riser, introducing the steam generated after steam-water separation in the steam drum 1-5 into a high-temperature heat storage tank 1-3, extracting hot water from the high-temperature heat storage tank 1-3, pressurizing the hot water by a third water pump 1-10, mixing the hot water with water fed from an outlet of any stage of a regenerator, and absorbing heat in a next stage of the regenerator until the hot water enters the boiler 2-1.
Example 4
In an alternative embodiment, as shown in fig. 4, in example 4, in order to simplify the system equipment based on the inventive concept, the condensed water extracted from the tail end of the condenser 2-4 of the steam power generation system may be directly introduced into the first deaerator 1-7 of the converter waste heat recovery system, and may be matched with any one of the modes of steam-water flow examples 1, 2 and 3 of the converter flue gas waste heat recovery system.
In the preferred embodiment of the utility model, the continuous operation of the converter flue gas waste heat recovery coupling power generation system is realized by arranging a high-temperature heat storage tank 1-3 behind a steam drum, the high-temperature heat storage tank 1-3 adopts wet pressure-variable heat storage, the high-temperature heat storage tank 1-3 continuously supplies hot water or steam to a steam power generation system and injects the hot water or steam into a boiler steam-water system, and the steam from the steam drum 1-5 during converter blowing is used for heat storage of the high-temperature heat storage tank 1-3 to improve the enthalpy of the hot water and supplement the steam. The inlet and outlet of the high-temperature heat storage tank 1-3 are provided with a flow regulating valve and a shutoff valve, so that the flow of working medium injected into the steam power generation system boiler 2-1 can be regulated in real time, and the shutoff valve is disconnected from the converter flue gas waste heat recovery system when the converter 1-1 is stopped.
In the preferred embodiment of the utility model, the high-temperature heat storage tank 1-3 is connected with the deaerator 1-7 through the third water pump 1-9, and the deaerator provides low-temperature water for the high-temperature heat storage tank 1-3 through the third water pump 1-9. The outlet of the high-temperature heat storage tank 1-3 is provided with a first water pump 1-4, the converter waste heat recovery system operates under a low-pressure working condition, and the first water pump 1-4 is used for pressurizing water or steam coming out of the high-temperature heat storage tank 1-3 to be consistent with the working medium pressure of the steam power generation system and then injecting the water or steam into the steam-water system in the steam power generation system.
In the preferred embodiment of the utility model, the high-temperature steam of the converter flue gas waste heat recovery system lower than the deaerator 1-7 can be sourced from the steam turbine 2-2 of the steam power generation system for exhausting, can also be sourced from industrial steam used by a steel plant or steam conveyed by the drum 1-5 of the converter flue gas waste heat recovery system.
In other embodiments of the present utility model, the steam power generation system is a conventional thermal power generation system, and includes a boiler 2-1, a steam turbine 2-2, a generator 2-3, a condenser 2-4, a condensate pump 2-5, a regenerator 2-6, a second deaerator 2-7, and the like. The boiler 2-1 heats the feed water to generate superheated steam, and the superheated steam enters the steam turbine 2-2 to do work and generate electricity through the generator 2-3. Optionally, the boiler 2-1 is a primary reheating system or a secondary reheating system, the steam turbine 2-2 is provided with a multi-stage air extraction heating water supply, and the condenser 2-3 adopts a water cooling or air cooling mode. Optionally, the steam generator set boiler 2-1 can be a natural circulation boiler or a once-through boiler, and the source of the fuel of the boiler 2-1 can be coal, oil, gas or even other fuels such as biomass.
The utility model is not related in part to the same as or can be practiced with the prior art.
The foregoing technical solution is only one embodiment of the present utility model, and various modifications and variations can be easily made by those skilled in the art based on the principles disclosed in the present utility model, and are not limited to the structures described in the foregoing detailed description of the present utility model, so that the foregoing description is only preferred, but not limiting.
In addition to the foregoing examples, those skilled in the art will recognize from the foregoing disclosure that other embodiments can be made and in which various features of the embodiments can be interchanged or substituted, and that such modifications and changes can be made without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. The utility model provides a coupling power generation system is retrieved to converter flue gas waste heat high efficiency which characterized in that includes: the converter flue gas waste heat recovery system, the steam power generation system and the coupling component, wherein the coupling component comprises a high-temperature heat storage tank and a low-temperature water storage tank;
the converter flue gas waste heat recovery system comprises an evaporative cooler, a steam drum and a deaerator;
the specific connection pipeline relation of the working medium flowing in the converter flue gas waste heat recovery system, the steam power generation system and the coupling component is as follows:
the converter flue gas waste heat recovery system and the steam power generation system are coupled in a mode of mixing with working media of the power generation system by extracting steam from the high-temperature heat storage tank or injecting hot water into a steam-water system of the steam power generation system after the condensed water is extracted from the tail end of a condenser of the steam power generation system, cached in the low-temperature water storage tank and deoxidized by a deoxidizer and then injected into the steam drum, and a water working medium absorbs waste heat of converter flue gas in the evaporative cooler and generates steam to enter the steam drum; the mixed working medium absorbs heat in a steam power generation system boiler to generate steam, and the steam power generation system boiler sequentially passes through a steam turbine and a generator to generate power efficiently.
2. The converter flue gas waste heat efficient recovery coupling power generation system according to claim 1, wherein low-temperature water extracted from the steam power generation system enters the converter waste heat recovery system for heating, enters the high-temperature heat storage tank, and further returns to the steam power generation system.
3. The coupled power generation system for efficient recovery of waste heat from flue gas in a converter of claim 1, wherein the pressure on the hot water or steam side of the waste heat recovery system is higher than the minimum pressure required for injection of water to meet a turbine water system.
4. The converter flue gas waste heat efficient recovery coupling power generation system according to claim 1, wherein an inlet of the low-temperature water storage tank is connected with a condensate pump, condensate water of the steam power generation system is received and buffered, an outlet of the low-temperature water storage tank is connected with a deaerator of the converter flue gas waste heat recovery system, and a flow measurement and control device and a shut-off valve are arranged behind the low-temperature water storage tank, so that the converter flue gas waste heat recovery system is decoupled from the converter flue gas waste heat recovery system when a converter is stopped.
5. The converter flue gas waste heat efficient recovery coupling power generation system according to claim 1, wherein the high-temperature heat storage tank and the low-temperature water storage tank are provided with redundancy in volume so as to ensure that the flow rate of the high-temperature heat storage tank which can still be output to the steam power generation system is kept unchanged during intermittent operation of the converter, and the operation stability of the steam power generation system is ensured.
6. The converter flue gas waste heat efficient recovery coupling power generation system according to claim 1, wherein the converter flue gas waste heat recovery system steam-water pipeline connection relationship is: the method comprises the steps that condensate is extracted from the tail end of a condenser of a steam power generation system, is buffered and controlled at the flow rate of a low-temperature water storage tank, and is deoxidized by a deoxidizer or the extracted condensate directly enters the deoxidizer, and enters a steam drum through a second water pump, water working medium is introduced into an evaporative cooler of a converter flue through a down pipe by the steam drum, steam is produced by evaporation of hot water in the evaporative cooler and is introduced into the steam drum through a riser, steam produced by steam-water separation in the steam drum enters a high-temperature heat storage tank, and hot water or steam is extracted in the high-temperature heat storage tank and is injected into a steam-water system in the steam power generation system through a first water pump.
7. The converter flue gas waste heat efficient recovery coupling power generation system according to claim 1, wherein a first water pump is arranged at the outlet of the high-temperature heat storage tank, the converter waste heat recovery system operates under a low-pressure working condition, and the first water pump is used for pumping water or steam led out of the heat storage tank to a steam-water system which is consistent with the working medium pressure of the steam power generation system and then is injected into the steam power generation system.
8. The converter flue gas waste heat efficient recovery coupling power generation system according to claim 1, wherein the high-temperature heat storage tank is connected with the deaerator through a third water pump, the deaerator provides low-temperature water for the high-temperature heat storage tank through the third water pump, and working medium extracted from the high-temperature heat storage tank is hot water or steam; the hot water extracted from the high-temperature heat storage tank can be mixed with water fed from the inlet of the boiler, and also can be mixed with water fed from the outlet of any level of heat regenerator after the deaerator, and the extracted hot water or steam can be mixed with reheat steam and then enter the boiler to absorb heat.
9. The converter flue gas waste heat efficient recovery coupling power generation system according to claim 1, wherein a high-temperature heat storage tank is arranged behind a steam drum, the high-temperature heat storage tank adopts wet-type variable-pressure heat storage, the high-temperature heat storage tank continuously supplies hot water or steam to a steam power generation system and injects the hot water or the steam into a boiler steam-water system, and the heat of the hot water is improved and the steam is supplemented by the heat storage of the heat storage tank by the steam from the steam drum during converter blowing; the inlet and outlet of the high-temperature heat storage tank are provided with a flow regulating valve and a shutoff valve, so that the flow of working medium injected into a boiler of the steam power generation system can be regulated in real time, and the shutoff valve is disconnected from the converter flue gas waste heat recovery system when the converter is stopped.
10. The converter flue gas waste heat efficient recovery coupling power generation system according to claim 1, wherein the steam power generation system comprises a boiler, a steam turbine, a generator, a condenser, a water pump, a heat regenerator and a deaerator, superheated steam generated by heating water by the boiler enters the steam turbine to apply work and generate power by the generator, the boiler is a primary reheating system or a secondary reheating system, the steam turbine is provided with multistage air extraction and heating water supply, and the condenser adopts a water cooling or air cooling mode.
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| CN202222889295.5U CN219103729U (en) | 2022-10-31 | 2022-10-31 | Coupling power generation system is retrieved to converter flue gas waste heat high efficiency |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222889295.5U CN219103729U (en) | 2022-10-31 | 2022-10-31 | Coupling power generation system is retrieved to converter flue gas waste heat high efficiency |
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