CN115681928A - Wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag - Google Patents
Wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag Download PDFInfo
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- CN115681928A CN115681928A CN202211437531.8A CN202211437531A CN115681928A CN 115681928 A CN115681928 A CN 115681928A CN 202211437531 A CN202211437531 A CN 202211437531A CN 115681928 A CN115681928 A CN 115681928A
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Abstract
The invention relates to the technical field of waste heat recovery, and provides a wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag, which comprises: the high-temperature steel slag cooling device is internally provided with high-temperature steel slag; the high-temperature flue gas superheater is characterized in that a feeding port of the high-temperature flue gas superheater is communicated with a smoke outlet of the high-temperature steel slag cooling device through a high-temperature flue, and a discharge port of the high-temperature flue gas superheater is communicated with a smoke inlet of the high-temperature steel slag cooling device through a circulating flue; the solid-solid heat exchange steam generator is internally provided with a heat exchange structure, the heat exchange structure is used for outputting saturated steam to an inlet of the steam pipeline, and an outlet of the steam pipeline penetrates through the inside of the high-temperature flue gas superheater and then is connected with power generation equipment; and the feeding end of the material conveyer is connected with the discharge port of the high-temperature steel slag cooling device, and the discharge end of the material conveyer is connected with the feeding port of the solid-solid heat exchange steam generator.
Description
Technical Field
The invention relates to the technical field of waste heat recovery, in particular to a wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag.
Background
As a carbon emission household in the steel industry, the carbon emission accounts for 18 percent of the total carbon emission in China, and is high and second in all industrial categories, so that the realization of low carbonization becomes an important measure for promoting the steel industry to realize the leap-type high-quality development.
The existing metallurgical slag waste heat recovery method mainly comprises the following steps: a. the dry granulation waste heat recovery technology comprises the steps of utilizing granulation devices such as a rotary table or a rotary drum to break molten metallurgical slag into fine metallurgical slag particles under the action of mechanical force, carrying out heat exchange between air and high-temperature slag particles in a fluidized bed (or a fixed bed or a moving bed), and driving a waste heat boiler to generate steam by the heated air to generate power; b. the wind tunnel air quenching method is characterized in that high-pressure air is utilized to directly impact a metallurgical slag stream to crush the metallurgical slag stream, and meanwhile, the air and crushed slag particles exchange heat. c. Hot-stewing can method. The several process methods are not popularized and applied, and have the following defects: (1) The temperature of the discharged metallurgical slag is high, the energy content is huge, the specific heat exchange of air is low, the Cg =1.0 kj/(kg), and the air is used as a heat exchange medium to recover the heat of the metallurgical slag, which inevitably causes the air slag to be large, so that a fan with large air volume is matched with the air slag; (2) Metallurgical slag particles obtained by dry granulation waste heat recovery are small, the void ratio of the slag particles in a fixed bed, a moving bed and a fluidized bed is low, so that the pressure of blast air is high, and the power consumption of a waste heat recovery system is increased; (3) Fine metallurgical slag particles are blown and carried in hot air, and dust removal equipment is required to be added, so that the construction cost and the operation cost are increased; (4) The air quenching method seriously affects the iron recovery due to the oxidation of iron element, and has poor economical efficiency; (5) The hot tank-closing method has long cooling time and poor recovery effect of the waste heat of the steel slag at the low temperature section.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag so as to solve the problems in the background art.
In order to achieve the purpose, the invention is realized by the following technical scheme: a wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag comprises:
the high-temperature steel slag cooling device is internally provided with high-temperature steel slag;
the high-temperature flue gas superheater is characterized in that a feed inlet of the high-temperature flue gas superheater is communicated with a smoke outlet of the high-temperature steel slag cooling device through a high-temperature flue, and a discharge outlet of the high-temperature flue gas superheater is communicated with a smoke inlet of the high-temperature steel slag cooling device through a circulating flue;
the solid-solid heat exchange steam generator is internally provided with a heat exchange structure, the heat exchange structure is used for outputting saturated steam to an inlet of the steam pipeline, and an outlet of the steam pipeline penetrates through the inside of the high-temperature flue gas superheater and then is connected with power generation equipment; and
the feeding end of the material conveyer is connected with the discharge hole of the high-temperature steel slag cooling device, and the discharge end of the material conveyer is connected with the feeding hole of the solid-solid heat exchange steam generator.
Further, an economizer and an evaporation system are arranged in the solid-solid heat exchange steam generator;
the heat exchange structure comprises a water feed pump, a deaerator and a steam drum, wherein an outlet of the water feed pump is communicated with an inlet of the deaerator through a preheating pipe, an outlet of the deaerator is communicated with an inlet of the economizer, an outlet of the economizer is communicated with a liquid inlet of the steam drum, a liquid outlet of the steam drum is communicated with an inlet of a steam system, an outlet of the steam system is communicated with a steam inlet of the steam drum, and a steam outlet of the steam drum is communicated with an inlet of a steam pipeline.
Furthermore, an inlet of the preheating pipe is communicated with an outlet of the feed water pump, and an outlet of the preheating pipe penetrates through the high-temperature flue gas superheating furnace and then is communicated with an inlet of the deaerator.
Further, the power generation equipment is a steam turbine.
Further, still include the storage silo, the storage silo sets up high temperature slag cooling device with between the material transport machine, the pan feeding mouth of storage silo with high temperature slag cooling device's discharge gate intercommunication, the storage silo has a plurality of discharge gates, a plurality of discharge gates of storage silo all with the feed end of material transport machine is connected.
Furthermore, a discharge port of the high-temperature steel slag cooling device is provided with crushing equipment.
Furthermore, a circulating fan is installed on the circulating flue and used for introducing the flue gas in the high-temperature flue gas overheating furnace into the high-temperature steel slag cooling device.
Has the beneficial effects that:
1. the wind-solid coupling efficient waste heat recovery system applied to the high-temperature steel slag provided by the invention is used for cooling the high-temperature steel slag in sections through the high-temperature flue gas superheater and the solid-solid heat exchange steam generator, so that the energy gradient utilization is realized, and the waste heat is recovered to the utmost extent.
2. The wind-solid coupling efficient waste heat recovery system applied to the high-temperature steel slag greatly improves the steam quality through a coupling technology, so that the power generation efficiency is improved.
3. Compared with the technologies of a water quenching method, an air quenching method, a hot splashing method, a hot smoldering method, an aging method and the like of the steel slag pretreatment process of domestic iron and steel enterprises, the wind-solid coupling efficient waste heat recovery system applied to the high-temperature steel slag has the advantages of short cooling period of the high-temperature steel slag, high treatment efficiency, high automation level, high degree of cleanliness and the like, and can improve the maximum recovery degree of the high-temperature steel slag.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a partial structural schematic diagram of the present invention.
Reference numerals: 10-a high-temperature steel slag cooling device, 11-a high-temperature flue, 12-a circulating flue, 13-a circulating fan, 20-a high-temperature flue gas superheater, 30-a solid-solid heat exchange steam generator, 40-a steam pipeline, 41-power generation equipment, 50-a material conveyor, 60-a heat exchange structure, 61-a water feed pump, 62-a deaerator, 63-a steam drum, 64-a preheating pipe, 65-a water feed pipe, 66-a descending pipe, 67-an ascending pipe and 70-a storage bin.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments.
In this application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present application, it is to be understood that the terms "longitudinal," "lateral," "horizontal," "top," "bottom," "upper," "lower," "inner" and "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientation or positional relationship indicated in the drawings, and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so indicated must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate a number of the indicated technical features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
As shown in fig. 1-2, the invention provides a wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag, which comprises a high-temperature steel slag cooling device 10, a high-temperature flue gas superheater 20, a solid-solid heat exchange steam generator 30, a steam pipeline 40 and a material conveyor 50.
The high-temperature steel slag cooling device 10 is filled with high-temperature steel slag.
The feeding port of the high-temperature flue gas superheater 20 is communicated with the smoke outlet of the high-temperature steel slag cooling device 10 through a high-temperature flue 11, and the discharge port of the high-temperature flue gas superheater 20 is communicated with the smoke inlet of the high-temperature steel slag cooling device 10 through a circulating flue 12.
The solid-solid heat exchange steam generator 30 has a heat exchange structure 60 therein, and the heat exchange structure 60 is used for outputting saturated steam to the inlet of the steam pipeline 40. The outlet of the steam pipeline 40 passes through the inside of the high-temperature flue gas superheater 20 and then is connected with the power generation equipment 41, and the steam pipeline 40 is arranged in a serpentine shape in the high-temperature flue gas superheater 20.
The feeding end of the material conveyer 50 is connected with the discharge port of the high-temperature steel slag cooling device 10, and the discharge end of the material conveyer 50 is connected with the feeding port of the solid-solid heat exchange steam generator 30.
The working process of the system is as follows: on the one hand, the high-temperature steel slag is cooled in the high-temperature steel slag cooling device 10, the high-temperature flue gas generated by cooling enters the high-temperature flue gas superheater 20 through the high-temperature flue 11 to exchange heat with the steam pipeline 40, the high-temperature flue gas becomes low-temperature flue gas after heat exchange, the low-temperature flue gas enters the high-temperature steel slag cooling device 10 through the circulating flue 12 to continuously exchange heat with solid particle materials such as the high-temperature steel slag arranged in the high-temperature flue gas superheater 20, meanwhile, the high-temperature flue gas is generated, and the generated high-temperature flue gas enters the high-temperature flue gas superheater 20 again through the high-temperature flue 11, so that the cyclic utilization of the flue gas is realized. On the other hand, the cooled solid particles such as the high-temperature steel slag are discharged from the discharge port of the high-temperature steel slag cooling device 10, enter the solid-solid heat exchange steam generator 30 through the material conveyor, exchange heat with the heat exchange structure 60 inside the solid-solid heat exchange steam generator, and are cooled, and then discharged from the discharge port, and the heat exchange structure 60 outputs saturated steam to the inlet of the steam pipeline 40, and generates electricity through the power generation equipment 41.
The system has the following advantages: 1. and (3) cooling in sections, namely cooling the high-temperature steel slag in sections through the high-temperature flue gas superheater 20 and the solid-solid heat exchange steam generator 30, realizing energy gradient utilization and recycling waste heat to the utmost extent. 2. Through the coupling technology, the steam quality is greatly improved, and therefore the power generation efficiency is improved. 3. Compared with the water quenching method, the air quenching method, the hot splashing method, the hot smoldering method, the aging method and other technologies of the steel slag pretreatment process of the domestic iron and steel enterprises, the technology has the advantages of short cooling period of the high-temperature steel slag, high treatment efficiency, high automation level, high degree of cleaning and the like, and can improve the maximum recovery degree of the high-temperature steel slag. The method can really realize the equipment, resource utilization and safe and clean purification of the high-temperature steel slag treatment, the treated tailings meet the requirements of national environmental protection policy and zero emission, the international competitiveness of China in the field of steel slag treatment is greatly improved, the process of high-added-value utilization of the steel slag is promoted, and the method has great economic benefit and social benefit. The successful research and development of the technology can help enterprises to remove some restriction factors existing in the process of the previous short process, and the enterprises with the short process are supported to realize carbon emission reduction more quickly and better.
In one embodiment, an economizer and evaporation system are provided within the solid heat exchange steam generator 30.
Specifically, the heat exchange structure 60 includes a feed water pump 61, a deaerator 62, and a steam drum 63. The outlet of the water feeding pump 61 is communicated with the inlet of the deaerator 62 through a preheating pipe 64, the outlet of the deaerator 62 is communicated with the inlet of the economizer, the outlet of the economizer is communicated with the liquid inlet of the steam pocket 63 through a water feeding pipe 65, the liquid outlet of the steam pocket 63 is communicated with the inlet of the steam system through a descending pipe 66, and the outlet of the steam system is communicated with the steam inlet of the steam pocket 63 through an ascending pipe 67. The steam outlet of the steam drum 63 communicates with the inlet of the steam line 40.
The working process of the heat exchange structure 60 is as follows: in water-feeding pump 61 sent demineralized water into oxygen-eliminating device 62, the energy-saving appliance who enters into solid heat transfer steam generator 30 again after 62 deoxidations of oxygen-eliminating device heats, and hot water after the heating enters into steam pocket 63 through feed pipe 65 in to get into evaporation system through downcomer 66, produce high-pressure saturated steam after the heating. High-temperature saturated steam enters the steam drum 63 through the ascending pipe 67, after steam-water separation of the steam drum 63, clean steam enters the high-temperature flue gas superheater 20 through the steam pipeline 40 to be superheated, and the generated high-temperature high-pressure steam is sent to the power generation equipment 41 to generate power.
In one embodiment, the inlet of the preheating pipe 64 is communicated with the outlet of the feed water pump 61, and the outlet of the preheating pipe 64 is communicated with the inlet of the deaerator 62 after passing through the high temperature flue gas superheater 20.
The preheating pipe 64 can preheat the demineralized water discharged from the water supply pump 61, thereby reducing the steam consumption of the deaerator 62. Meanwhile, after heat exchange, the temperature of the high-temperature flue gas in the high-temperature flue gas superheater 20 can be further reduced, and limit recovery of the waste heat of the high-temperature flue gas is realized.
In one embodiment, the power generation equipment 41 is a steam turbine.
In one embodiment, the high-temperature steel slag cooling device further comprises a storage bin 70, the storage bin 70 is disposed between the high-temperature steel slag cooling device 10 and the material conveyer 50, and a feeding port of the storage bin 70 is communicated with a discharging port of the high-temperature steel slag cooling device 10. The storage bin 70 has a plurality of discharge ports that are each connected to the feed end of the material conveyor 50.
The storage bin 70 can collect the steel slag discharged from the high temperature steel slag cooling device 10, and uniformly distribute the steel slag on the feeding end of the material conveyor through a plurality of discharge ports, so that the steel slag can uniformly enter the solid-solid heat exchange steam generator 30.
In one embodiment, a crushing device is installed at the discharge port of the high-temperature steel slag cooling device 10, and the crushing device crushes the steel slag into a suitable particle size and then enters the storage bin 70, so as to further improve the heat exchange efficiency of the subsequent steel slag.
In one embodiment, a circulating fan 13 is installed on the circulating flue 12, and the circulating fan 13 is used for introducing the flue gas in the high-temperature flue gas superheater 20 into the high-temperature steel slag cooling device 10 to promote flue gas circulation.
While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a wind solid coupling high-efficient waste heat recovery system for high temperature steel slag which characterized in that: the method comprises the following steps:
the high-temperature steel slag cooling device is internally provided with high-temperature steel slag;
the high-temperature flue gas superheater is characterized in that a feeding port of the high-temperature flue gas superheater is communicated with a smoke outlet of the high-temperature steel slag cooling device through a high-temperature flue, and a discharging port of the high-temperature flue gas superheater is communicated with a smoke inlet of the high-temperature steel slag cooling device through a circulating flue;
the solid-solid heat exchange steam generator is internally provided with a heat exchange structure, the heat exchange structure is used for outputting saturated steam to an inlet of the steam pipeline, and an outlet of the steam pipeline penetrates through the inside of the high-temperature flue gas superheater and then is connected with power generation equipment; and
the feeding end of the material conveyer is connected with the discharge hole of the high-temperature steel slag cooling device, and the discharge end of the material conveyer is connected with the feeding hole of the solid-solid heat exchange steam generator.
2. The wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag according to claim 1, characterized in that: an economizer and an evaporation system are arranged in the solid-solid heat exchange steam generator;
the heat exchange structure comprises a water feed pump, a deaerator and a steam drum, wherein an outlet of the water feed pump is communicated with an inlet of the deaerator through a preheating pipe, an outlet of the deaerator is communicated with an inlet of the economizer, an outlet of the economizer is communicated with a liquid inlet of the steam drum, a liquid outlet of the steam drum is communicated with an inlet of a steam system, an outlet of the steam system is communicated with a steam inlet of the steam drum, and a steam outlet of the steam drum is communicated with an inlet of a steam pipeline.
3. The wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag according to claim 1, characterized in that: the inlet of the preheating pipe is communicated with the outlet of the feed pump, and the outlet of the preheating pipe penetrates through the high-temperature flue gas superheating furnace and then is communicated with the inlet of the deaerator.
4. The wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag according to claim 1, characterized in that: the power generation equipment is a steam turbine.
5. The wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag according to claim 1, characterized in that: still include the storage silo, the storage silo sets up high temperature steel slag cooling device with between the material transport machine, the pan feeding mouth of storage silo with high temperature steel slag cooling device's discharge gate intercommunication, the storage silo has a plurality of discharge gates, a plurality of discharge gates of storage silo all with material transport machine's feed end is connected.
6. The wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag according to claim 5, characterized in that: and a discharge port of the high-temperature steel slag cooling device is provided with crushing equipment.
7. The wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag according to claim 1, characterized in that: and the circulating flue is provided with a circulating fan, and the circulating fan is used for introducing the flue gas in the high-temperature flue gas overheating furnace into the high-temperature steel slag cooling device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211437531.8A CN115681928A (en) | 2022-11-17 | 2022-11-17 | Wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag |
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| CN202211437531.8A CN115681928A (en) | 2022-11-17 | 2022-11-17 | Wind-solid coupling efficient waste heat recovery system applied to high-temperature steel slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116287494A (en) * | 2023-03-15 | 2023-06-23 | 山西航金环保科技有限公司 | Energy-saving and environment-friendly treatment method for high-temperature liquid steel slag |
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2022
- 2022-11-17 CN CN202211437531.8A patent/CN115681928A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116287494A (en) * | 2023-03-15 | 2023-06-23 | 山西航金环保科技有限公司 | Energy-saving and environment-friendly treatment method for high-temperature liquid steel slag |
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