CN115900336A - Oxygen-enriched rotary hearth furnace system - Google Patents
Oxygen-enriched rotary hearth furnace system Download PDFInfo
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- CN115900336A CN115900336A CN202211407401.XA CN202211407401A CN115900336A CN 115900336 A CN115900336 A CN 115900336A CN 202211407401 A CN202211407401 A CN 202211407401A CN 115900336 A CN115900336 A CN 115900336A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention relates to an oxygen-enriched rotary hearth furnace system, and belongs to the field of metallurgical solid waste treatment. Comprises a rotary hearth furnace, a raw material system, a flue gas system, a coal gas system, an oxygen system and a nitrogen system; the rotary hearth furnace is provided with an oxygen-enriched burner nozzle of the rotary hearth furnace, which takes coal gas as fuel and oxygen-enriched gas as combustion improver; the coal gas system is provided with a coal gas preheater, the raw material system is provided with a drying unit, part of hot flue gas generated by the oxygen-enriched burner of the rotary hearth furnace is recycled by a waste heat boiler to generate steam, and part of hot flue gas enters the drying unit through the coal gas preheater; the burner of the coal gas preheating and drying unit is connected with the coal gas preheater and operates in two modes of air combustion supporting or oxygen-enriched combustion supporting. The oxygen-enriched rotary hearth furnace system and the process can use coal gas with various heat values, are combined with an oxygen-enriched combustion mode, can especially fully utilize low-heat-value coal gas of a steel mill to be used for the rotary hearth furnace process, and have the advantages of saving energy, reducing carbon emission and the like.
Description
Technical Field
The invention belongs to the field of metallurgical solid waste treatment, and relates to an oxygen-enriched rotary hearth furnace system.
Background
At present, the capacity of crude steel in China exceeds one hundred million tons, wherein a long-process steel enterprise generates about 40kg of iron-containing zinc dust mud (comprising blast furnace bag ash/gas mud, converter LT ash/OG mud, refined ash and the like) per ton of steel, a short-process steel generates about 10kg to 20kg of zinc-containing electric furnace ash, and the metallurgical iron-containing zinc dust mud is generated by accumulation all the year round and reaches 3000 ten thousand tons.
The rotary hearth furnace is a mainstream process for treating low-zinc-content solid waste, valuable elements such as zinc, iron and the like can be recovered from iron-containing zinc dust mud after reduction by the rotary hearth furnace, the rotary hearth furnace process is rapidly popularized and applied in the domestic metallurgical solid waste field in recent years, and huge economic and social benefits are obtained. The gas consumption of the rotary hearth furnace in the operation process is a main expenditure item of the operation cost, a steel mill has a large amount of by-product gas, especially low-heat value gas such as blast furnace gas, and because the dust content of the flue gas in the rotary hearth furnace is high and zinc needs to be recovered, a heat storage combustion technology cannot be used, so that how to use the low-heat value gas to meet the heating reduction temperature requirement of the rotary hearth furnace is a difficult problem facing at present.
Disclosure of Invention
In view of this, the present invention provides an oxygen-enriched rotary hearth furnace system to solve the problem that the rotary hearth furnace uses the by-product gas with various heat values in the steel plant.
In order to achieve the purpose, the invention provides the following technical scheme:
an oxygen-enriched rotary hearth furnace system comprises a rotary hearth furnace, a raw material system, a flue gas system, a coal gas system, an oxygen system and a nitrogen system;
the rotary hearth furnace is provided with a rotary hearth furnace oxygen enrichment burner, and the rotary hearth furnace oxygen enrichment burner takes coal gas as fuel and oxygen enrichment as combustion improver;
the coal gas system is provided with a coal gas preheater, the raw material system is provided with a drying unit, a part of hot flue gas generated by combustion of the oxygen-enriched burner of the rotary hearth furnace is subjected to heat recovery by a waste heat boiler to generate steam, a part of hot flue gas enters the drying unit through the coal gas preheater, and the coal gas is preheated by the coal gas preheater and then supplied to the oxygen-enriched burner of the rotary hearth furnace;
the burner of the coal gas preheating and drying unit is connected with the coal gas preheater, takes the coal gas as fuel and operates in two modes of air combustion supporting or oxygen-enriched combustion supporting;
the calorific value of the coal gas adopted by the coal gas system is more than 700kCal/Nm3, one part of the coal gas is preheated by the coal gas preheater and then supplied to the oxygen-enriched burner of the rotary hearth furnace, the preheating temperature of the coal gas is less than 600 ℃, and the other part of the coal gas is supplied to the burner of the coal gas preheating and drying unit.
Optionally, the inner ring and the outer ring of the rotary hearth furnace are provided with a plurality of rotary hearth furnace oxygen enrichment burners, the rotary hearth furnace oxygen enrichment burners are provided with a coal gas interface and an oxygen enrichment interface, the coal gas interface is connected with the coal gas preheater to utilize preheated coal gas, and the oxygen enrichment interface is connected with an oxygen system.
Optionally, the raw material system is sequentially provided with a raw material conveying unit, a bunker, a pelletizing unit and a finished pellet cooling unit along the material conveying direction, and the nitrogen system is used for the raw material conveying unit and the pellet cooling unit.
Optionally, a part of the flue gas discharged from the rotary hearth furnace passes through a waste heat boiler and a dust remover and is discharged to a chimney, the other part of the flue gas is mixed with the flue gas generated by a burner of the coal gas preheating and drying unit, and the waste heat boiler recovers the flue gas waste heat to generate steam.
Optionally, hot flue gas generated by the burner of the gas preheating and drying unit is mixed with part of flue gas discharged from the rotary hearth furnace, and then the hot flue gas is sequentially used for preheating gas and drying green pellets.
Optionally, when the burner of the coal gas preheating and drying unit operates in the oxygen-enriched combustion-supporting mode, the burner is supplied with oxygen in a form of mixing oxygen with air or supplying oxygen and air respectively.
Optionally, the raw materials of the raw material system are reduced by a rotary hearth furnace to generate metallized pellets.
Optionally, the nitrogen of the nitrogen system is externally supplied or is supplied by an oxygen generator.
Optionally, the priority of oxygen use is that the oxygen-enriched burner of the rotary hearth furnace is larger than the burner of the coal gas preheating and drying unit.
Optionally, the oxygen generator is driven by steam generated by recovering waste heat of a waste heat boiler and/or driven by external electricity.
The invention has the beneficial effects that:
the oxygen-enriched rotary hearth furnace system can use coal gas with various heat values, is combined with an oxygen-enriched combustion mode, particularly can fully utilize low-heat-value coal gas of a steel mill to be used for a rotary hearth furnace process, and has the advantages of saving energy, reducing carbon emission and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of the system of the present invention, and FIG. 2 is a schematic view of another variable system of the present invention.
Reference numerals: the device comprises a rotary hearth furnace 1, an oxygen-enriched burner 11 of the rotary hearth furnace, a flue gas system 2, a preheating boiler 21, a dust remover 22, a chimney 23, a gas system 3, a gas preheater 31, a raw material system 4, a raw material conveying unit 41, a storage bin 42, a balling unit 43, a drying unit 44, a balling cooling unit 45, a burner 46 of the gas preheating and drying unit, an oxygen-enriched gas system 5, an oxygen generator 51 and a nitrogen system 6.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and embodiments may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the present invention includes a rotary hearth furnace 1, a raw material system 4, a flue gas system 2, a gas system 3, an oxygen system 5, and a nitrogen system 6. The main process flow is as follows: after entering the raw material system 4, the metallurgical dust and mud are pelletized in the pelletizing unit 43 and dried in the drying unit 44, the dried green pellets enter the rotary hearth furnace 1 for reduction, the metallized pellets generated after reduction enter the pellet cooling unit 45 for cooling, the rotary hearth furnace 1 adopts gas and oxygen-enriched gas for combustion for heat supply, the flue gas discharged from the rotary hearth furnace 1 enters the flue gas system 2, and the flue gas waste heat is recovered to generate steam.
The inner ring and the outer ring of the rotary hearth furnace 1 are both provided with a plurality of rotary hearth furnace oxygen enrichment burners 11, the rotary hearth furnace oxygen enrichment burners 11 take coal gas as fuel and oxygen enrichment as combustion improver, and the rotary hearth furnace oxygen enrichment burners 11 are provided with a coal gas interface and an oxygen enrichment gas interface, wherein the coal gas interface is connected with a preheated coal gas pipeline, and the oxygen enrichment gas interface is connected with the oxygen enrichment gas pipeline.
The heat value of the gas adopted by the oxygen-enriched burner 11 of the rotary hearth furnace and the burner 46 of the gas preheating and drying unit is more than 700kCal/Nm3. One part of the coal gas is supplied to the oxygen-enriched burner 11 of the rotary hearth furnace after being preheated, and the other part of the coal gas is supplied to the burner 46 of the coal gas preheating and drying unit, wherein the burner 46 of the coal gas preheating and drying unit can be arranged to be the same or separated.
The smoke discharged by the rotary hearth furnace 1 of the invention passes through the waste heat boiler 21 and the dust remover 22, and then part of the smoke is discharged to the chimney 23, and the other part of the smoke is mixed with the smoke generated by the burner 46 of the coal gas preheating and drying unit, wherein the steam generated by the waste heat boiler 21 can be sent out, and can also provide power for an oxygen generator 51 in another scheme (figure 2) of the invention.
The coal gas system 3 of the invention is provided with a coal gas preheater 31, one part of the coal gas is preheated by the coal gas preheater 31 and then is supplied to the oxygen-enriched burner 11 of the rotary hearth furnace, the preheating temperature of the coal gas is less than 600 ℃, and the other part of the coal gas is supplied to the burner 46 of the coal gas preheating and drying unit. The hot flue gas generated by the burner 46 of the coal gas preheating and drying unit is mixed with part of the flue gas discharged by the rotary hearth furnace 1 and then is sequentially used for the coal gas preheater 31 and the drying unit 44, the burner 46 of the coal gas preheating and drying unit can operate in two modes of air combustion supporting and oxygen-enriched combustion supporting, and the oxygen-enriched gas can be mixed with the air and then is supplied to the burner 46 of the coal gas preheating and drying unit, or the oxygen-enriched gas and the air are respectively supplied to the burner 46 of the coal gas preheating and drying unit.
In the invention, a raw material system 4 comprises a raw material conveying unit 41, a storage bin 42, a balling unit 43 and a green pellet drying unit 44, the raw materials are reduced by a rotary hearth furnace 1 to generate metallized pellets, and a pellet cooling unit 45 is arranged at an outlet of the rotary hearth furnace, the invention is provided with a nitrogen system 6, nitrogen can be supplied externally or by an oxygen generator 51 (figure 2), and the nitrogen is used for the raw material conveying unit 41 and the metallized pellet cooling unit 45.
In the invention, the priority of oxygen is that the oxygen-enriched burner 11 of the rotary hearth furnace is more than the burner 46 of the coal gas preheating and drying unit.
Fig. 2 shows another process system of the present invention, which is different from the process of fig. 1 in that an oxygen generator 51 is provided, the steam generated by recovering the waste heat of the flue gas system is used to provide power for the oxygen generator 51, the steam can directly drive the oxygen generator 51, or drive the oxygen generator 51 after power generation, the oxygen generated by the oxygen generator 51 is used for the oxygen-enriched burner 11 of the rotary hearth furnace, the burner 46 of the coal gas preheating and drying unit, and the nitrogen generated by the oxygen generator can be used for the raw material conveying unit 41 and the metallized pellet cooling unit 45.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides an oxygen boosting rotary hearth furnace system which characterized in that: comprises a rotary hearth furnace, a raw material system, a flue gas system, a coal gas system, an oxygen system and a nitrogen system;
the rotary hearth furnace is provided with a rotary hearth furnace oxygen enrichment burner, and the rotary hearth furnace oxygen enrichment burner takes coal gas as fuel and oxygen enrichment as combustion improver;
the coal gas system is provided with a coal gas preheater, the raw material system is provided with a drying unit, a part of hot flue gas generated by combustion of the oxygen-enriched burner of the rotary hearth furnace is subjected to heat recovery by a waste heat boiler to generate steam, a part of hot flue gas enters the drying unit through the coal gas preheater, and the coal gas is preheated by the coal gas preheater and then supplied to the oxygen-enriched burner of the rotary hearth furnace;
the burner of the coal gas preheating and drying unit is connected with the coal gas preheater, takes the coal gas as fuel and operates in two modes of air combustion supporting or oxygen-enriched combustion supporting;
the coal gas heat value adopted by the coal gas system is more than 700kCal/Nm & lt 3 & gt, one part of the coal gas is preheated by the coal gas preheater and then is supplied to the rotary hearth furnace oxygen-enriched burner, the coal gas preheating temperature is less than 600 ℃, and the other part of the coal gas is supplied to the coal gas preheating and drying unit burner.
2. An oxygen-enriched rotary hearth furnace system according to claim 1, wherein: the rotary hearth furnace oxygen enrichment burner is characterized in that a plurality of rotary hearth furnace oxygen enrichment burners are arranged on the inner ring and the outer ring of the rotary hearth furnace, a coal gas connector and an oxygen enrichment gas connector are arranged on the rotary hearth furnace oxygen enrichment burners, the coal gas connector is connected with a coal gas preheater to utilize preheated coal gas, and the oxygen enrichment gas connector is connected with an oxygen system.
3. An oxygen-enriched rotary hearth furnace system according to claim 1, wherein: the raw material system is sequentially provided with a raw material conveying unit, a storage bin, a pelletizing unit and a finished pellet cooling unit along the material conveying direction, and the nitrogen system is used for the raw material conveying unit and the pellet cooling unit.
4. An oxygen-enriched rotary hearth furnace system according to claim 1, wherein: and one part of the smoke discharged by the rotary hearth furnace is discharged to a chimney after passing through a waste heat boiler and a dust remover, the other part of the smoke is mixed with the smoke generated by a burner of a coal gas preheating and drying unit, and the waste heat boiler recovers the waste heat of the smoke to generate steam.
5. An oxygen-enriched rotary hearth furnace system according to claim 1, wherein hot flue gas generated by the burners of the gas preheating and drying unit is mixed with part of the flue gas discharged from the rotary hearth furnace and is used for preheating the gas and drying green pellets in turn.
6. An oxygen-enriched rotary hearth furnace system according to claim 1, wherein: when the burner of the coal gas preheating and drying unit operates in an oxygen-enriched combustion-supporting mode, oxygen-enriched gas and air are mixed and then fed, or the oxygen-enriched gas and the air are respectively fed to supply the gas.
7. An oxygen-enriched rotary hearth furnace system according to claim 1, wherein: the raw materials of the raw material system are reduced by a rotary hearth furnace to generate metallized pellets.
8. An oxygen-enriched rotary hearth furnace system according to claim 1, wherein: the nitrogen of the nitrogen system is supplied externally or is supplied by an oxygen generator.
9. An oxygen-enriched rotary hearth furnace system according to claim 1, wherein: the oxygen using priority order is that the oxygen-enriched burner of the rotary hearth furnace is larger than the burner of the coal gas preheating and drying unit.
10. An oxygen-enriched rotary hearth furnace system according to claim 8, wherein: the oxygen generator is driven by steam generated by recovering waste heat by a waste heat boiler and/or is driven by external electricity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211407401.XA CN115900336A (en) | 2022-11-07 | 2022-11-07 | Oxygen-enriched rotary hearth furnace system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211407401.XA CN115900336A (en) | 2022-11-07 | 2022-11-07 | Oxygen-enriched rotary hearth furnace system |
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| Publication Number | Publication Date |
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| CN115900336A true CN115900336A (en) | 2023-04-04 |
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| CN202211407401.XA Pending CN115900336A (en) | 2022-11-07 | 2022-11-07 | Oxygen-enriched rotary hearth furnace system |
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- 2022-11-07 CN CN202211407401.XA patent/CN115900336A/en active Pending
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