CN105402732B - Reducing and smelting regenerative combustion system and the method smelted using the system - Google Patents

Reducing and smelting regenerative combustion system and the method smelted using the system Download PDF

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Publication number
CN105402732B
CN105402732B CN201510900684.5A CN201510900684A CN105402732B CN 105402732 B CN105402732 B CN 105402732B CN 201510900684 A CN201510900684 A CN 201510900684A CN 105402732 B CN105402732 B CN 105402732B
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gas
air
temperature section
heat
smelting
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CN105402732A (en
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石为华
王东方
吴道洪
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Shenwu Technology Group Corp Co Ltd
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Shenwu Technology Group Corp Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

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  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The invention discloses a kind of reducing and smelting regenerative combustion system and the methods smelted using the system, the system includes: furnace body, first burner, second burner, first regenerative apparatus, first regenerative apparatus includes: first shell, the first heat accumulation space is limited in the first shell, there is the first air heat storage in first heat accumulation space, first expansion chamber, first coal gas heat storage and the second expansion chamber, second regenerative apparatus, second regenerative apparatus includes: second shell, the second heat accumulation space is limited in the second shell, there is the second air heat storage in second heat accumulation space, third expansion chamber, second coal gas heat storage and the 4th expansion chamber, first air three-way valve, first gas three-way valve, second air three-way valve, second gas three-way valve.The system can be with the waste heat in high efficiente callback flue gas, to significantly improve energy utilization rate.

Description

Reduction smelting heat accumulating type combustion system and smelting method using same
Technical Field
The invention belongs to the technical field of smelting, and particularly relates to a reduction smelting heat accumulating type combustion system and a smelting method by using the same.
Background
The gas melting furnace perfects the direct reduction-melting process of the coal-based rotary hearth furnace, plays an important role in the slag-iron separation process after the smelting of resources such as difficult ore dressing, laterite-nickel ore, vanadium-titanium magnetite, sulfuric acid slag and the like, breaks through the singleness of the submerged arc furnace smelting process, can save a large amount of electric energy, and provides a feasible scheme for industrial basic weak areas.
The regenerative combustion technology is the most widely used energy-saving and environment-friendly combustion technology in the industrial furnace at the present stage, and the technology is quite mature. However, when the existing heat accumulating type burner is applied to a melting furnace, the heat load required by the smelting process is much higher than that of a metallurgical heating furnace, the produced smoke gas amount is large, the volume of a heat accumulating chamber is relatively large, the position of a burner on a furnace body is unreasonable, the field construction difficulty is increased, and inconvenience is caused in installation, use and maintenance, meanwhile, dust generated in the smelting process of the heat accumulating type burner is easy to cause blockage of a heat accumulator, the heat accumulator replacement frequency is high, the operation cost of the burner is improved, in addition, the heat accumulating type burner is not considered from the combustion effect angle, a gas outlet channel and an air outlet channel are distributed left and right, the problems of insufficient mixing with air, low combustion efficiency, overhigh local temperature, generated nitrogen oxides and the like are easily generated, and the material oxidation burning loss in the smelting process is caused.
Therefore, the existing regenerative smelting technology needs to be further improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide a reduction smelting heat accumulating type combustion system and a smelting method using the same, wherein the system can efficiently recover waste heat in flue gas, so that the energy utilization rate is obviously improved.
In one aspect of the present invention, the present invention provides a regenerative combustion system for reduction smelting, comprising:
the smelting furnace comprises a furnace body, a furnace body and a smelting furnace, wherein the furnace body defines a smelting space, and an ignition burner, a first opening, a second opening and a material inlet are arranged on the side wall of the furnace body;
the first burner is positioned in the first opening and provided with a first air nozzle and a first gas nozzle;
the second burner is positioned in the second opening and provided with a second air nozzle and a second gas nozzle;
a first thermal storage device, the first thermal storage device comprising:
the smelting furnace comprises a first shell, a first heat storage space is defined in the first shell, a left settling chamber and a left heat accumulator are sequentially arranged in the first heat storage space along the direction far away from the furnace body, the left settling chamber comprises a first settling chamber and a second settling chamber, the left heat accumulator comprises a first air heat accumulator and a first coal gas heat accumulator, the first air heat accumulator is connected with the first settling chamber and communicated with the smelting space through a first air nozzle, and the first coal gas heat accumulator is connected with the second settling chamber and communicated with the smelting space through the first coal gas nozzle;
a first air inlet formed on the first housing, the first air inlet being coupled to the first air thermal mass;
the first gas inlet is formed in the first shell and connected with the first gas heat accumulator;
a second thermal storage device that includes:
a second shell, a second heat storage space is defined in the second shell, a right settling chamber and a right heat accumulator are sequentially arranged in the second heat storage space along the direction far away from the furnace body, the right settling chamber comprises a third settling chamber and a fourth settling chamber, the right heat accumulator comprises a second air heat accumulator and a second coal gas heat accumulator, the second air heat accumulator is connected with the third settling chamber and communicated with the smelting space through a second air nozzle, and the second coal gas heat accumulator is connected with the fourth settling chamber and communicated with the smelting space through a second coal gas nozzle;
a second air inlet formed in the second housing, the second air inlet coupled to the second air thermal mass;
the second gas inlet is formed in the second shell and connected with the second gas heat accumulator;
a first air three-way valve having a first air valve, a first air scavenging valve, a first air inlet, a first air exhaust outlet, and a first air outlet, the first air outlet connected to the first air inlet;
the first gas three-way valve is provided with a first gas valve, a first gas scavenging valve, a first gas inlet, a first gas waste gas outlet and a first gas outlet, and the first gas outlet is connected with the first gas inlet;
a second air three-way valve having a second air valve, a second air scavenging valve, a second air inlet, a second air exhaust outlet, and a second air outlet, the second air outlet being connected to the second air inlet; and
a second gas three-way valve having a second gas valve, a second gas scavenging valve, a second gas inlet, a second gas exhaust outlet, and a second gas outlet, the second gas outlet being connected to the second gas inlet,
wherein,
a first high-temperature section and a first low-temperature section are defined in the first air heat accumulator, the first high-temperature section is close to the first settling chamber, a second high-temperature section and a second low-temperature section are defined in the first gas heat accumulator, the second high-temperature section is close to the second settling chamber, ceramic pellets are filled at the upper parts of the first high-temperature section and the second high-temperature section, honeycomb ceramics are filled at the middle lower part of the first high-temperature section, the middle lower part of the second high-temperature section, the first low-temperature section and the second low-temperature section,
a third high-temperature section and a third low-temperature section are defined in the second air heat storage body, the third high-temperature section is close to the third settling chamber, a fourth high-temperature section and a fourth low-temperature section are defined in the second gas heat storage body, the fourth high-temperature section is close to the fourth settling chamber, ceramic balls are filled at the upper parts of the three high-temperature section and the fourth high-temperature section, and honeycomb ceramics are filled at the middle lower part of the third high-temperature section, the middle lower part of the fourth high-temperature section, the third low-temperature section and the fourth low-temperature section.
According to the reduction smelting heat accumulating type combustion system provided by the embodiment of the invention, the independent burner is used, compared with the traditional system formed by integral casting, the damage to the furnace body when the burner is replaced can be effectively avoided, the gas and the air are supplied into the furnace body from the same side of the furnace body, the air and the gas are fully mixed, the combustion efficiency is obviously improved, compared with the mode that the air and the gas are respectively supplied to two sides, the local oxidation of materials can be effectively avoided, meanwhile, the ceramic pellet heat accumulator and the honeycomb ceramic heat accumulator are combined for heat accumulation in the heat accumulation device, the system structure is more compact, the heat accumulation and heat release speed is high, the waste heat recovery efficiency is obviously improved, the energy utilization rate is further improved, in addition, the sedimentation chamber is arranged in the heat accumulation device, the particles in the flue gas can be effectively removed, and the blockage of the heat accumulator is effectively avoided, thereby ensuring the stable operation of the system.
In addition, the reduction smelting regenerative combustion system according to the above embodiment of the present invention may further have the following additional technical features:
in some embodiments of the present invention, the reduction smelting regenerative combustion system further comprises: and the flue gas recovery device is respectively connected with the first air waste gas outlet, the first coal gas waste gas outlet, the second air waste gas outlet and the second coal gas waste gas outlet. Therefore, environmental pollution can be effectively avoided.
In some embodiments of the invention, the first air jet, the first gas jet, the second air jet and the second gas jet are elliptical. Therefore, the combustion efficiency of air and coal gas can be obviously improved.
In some embodiments of the invention, the first air jets are located above the first gas jets and the second air jets are located above the second gas jets in a vertical direction. Thereby, the combustion efficiency of air and gas can be further improved.
In some embodiments of the invention, the first air nozzle direction, the first gas nozzle direction, the second air nozzle direction and the second gas nozzle direction respectively and independently form an included angle of 5-10 degrees with the horizontal direction. Thereby, the combustion efficiency of air and gas can be further improved.
In some embodiments of the invention, the first thermal storage device is connected to the first aperture by a first flange, and the second thermal storage device is connected to the second aperture by a second flange. Therefore, the system is more convenient to maintain and replace.
In some embodiments of the invention, the gap between the first burner and the first opening and the gap between the second burner and the second opening are filled with fiber mats independently. Thereby, heat loss can be effectively avoided.
In some embodiments of the invention, the first heat storage device and the second heat storage device are symmetrically distributed on two sides of the furnace body.
In some embodiments of the present invention, the reduction smelting regenerative combustion system further comprises: and the control device is respectively connected with the first heat storage device, the second heat storage device, the first air three-way valve, the first gas three-way valve, the second air three-way valve and the second gas three-way valve, and is suitable for controlling the opening and closing of the first air valve, the first gas valve, the second air valve and the second gas valve according to the temperatures of the first air heat accumulator, the first gas heat accumulator, the second air heat accumulator and the second gas heat accumulator in the first heat storage device and the second heat storage device.
In another aspect of the invention, the invention discloses a method for smelting by adopting the reduction smelting heat accumulating type combustion system, which comprises the following steps:
(1) igniting the gas in the smelting space of the furnace body by using an ignition burner;
(2) opening a first air valve and a first gas valve through a control device, closing a second air valve and the first gas valve, enabling air to sequentially pass through a first air heat accumulator and a first settling chamber in a first heat storage device and enter a smelting space through a first air nozzle on a first burner nozzle, enabling gas to sequentially pass through a first gas heat accumulator and a second settling chamber in the first heat storage device and enter the smelting space through a first gas nozzle on the first burner nozzle, so that the gas and the air are combusted to generate reducing gas, and reducing materials in the smelting space by using the reducing gas to obtain flue gas;
(3) the flue gas passes through a second air nozzle and a second coal gas nozzle on a second burner and sequentially enters a third settling chamber and a second air heat accumulator, a fourth settling chamber and a second air heat accumulator in a second heat storage device respectively so as to remove particles in the flue gas and recover the waste heat of the flue gas;
(4) the first air valve and the first gas valve are closed through the control device, and the second air valve and the second gas valve are opened, so that the waste heat recovered in the second heat storage device is used for preheating the air and the gas, and the preheated air and the preheated gas are obtained;
(5) burning the preheated air and coal gas in a smelting space to generate reducing gas, and reducing the materials in the smelting space by using the reducing gas so as to obtain flue gas;
(6) the flue gas passes through a first air nozzle and a first coal gas nozzle on a first burner and sequentially enters a first settling chamber and a first air heat accumulator, a second settling chamber and a first air heat accumulator in a first heat storage device respectively so as to remove particles in the flue gas and recover the waste heat of the flue gas;
(7) and (4) repeating the steps (2) to (6).
According to the smelting method provided by the embodiment of the invention, the reduction smelting heat accumulating type combustion system is used for smelting, so that the damage to the furnace body when the burner is replaced can be effectively avoided, the gas and the air are supplied into the furnace body from the same side of the furnace body, the air and the gas are fully mixed, the combustion efficiency is obviously improved, and compared with the mode that the air and the gas are respectively supplied to two sides, the partial oxidation of materials can be effectively avoided, the system structure is more compact, the heat accumulation and heat release speed is high, the waste heat recovery efficiency is obviously improved, the energy utilization rate is improved, in addition, particles in the flue gas can be effectively removed, the blockage of a heat accumulator is effectively avoided, and the stable operation of the system is further ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic structural view of a regenerative combustion system for reduction smelting according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a burner in a regenerative reduction smelting combustion system according to yet another embodiment of the present invention;
fig. 3 is a schematic structural view of a reduction smelting regenerative combustion system according to still another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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 present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In one aspect of the invention, a regenerative combustion system for reduction smelting is provided. The regenerative combustion system for reduction smelting according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 3. According to an embodiment of the invention, the system comprises:
furnace body 100: according to an embodiment of the invention, the furnace body 100 defines a smelting space 10, and the side wall of the furnace body 100 is provided with an ignition burner 11, a first opening 12, a second opening 13 and a material inlet 14.
According to an embodiment of the present invention, the furnace body 100 may be a melting furnace.
According to an embodiment of the present invention, the first and second openings 12 and 13 may be provided on any two sides of the furnace body 100, and according to a specific embodiment of the present invention, the first and second openings 12 and 13 may be symmetrically provided on two sides of the furnace body 100.
First burner 200: according to an embodiment of the present invention, a first burner tip 200 may be positioned within the first opening 12. according to an embodiment of the present invention, the first burner tip 200 has a first air port 21 and a first gas port 22.
According to an embodiment of the present invention, the first air nozzle 21 and the first gas nozzle 22 may have an oval shape.
According to the embodiment of the invention, the first air nozzle 21 is positioned above the first gas nozzle 22 in the vertical direction (as shown in fig. 2), and the direction of the first air nozzle 21 and the direction of the first gas nozzle 22 respectively and independently form an included angle of 5-10 degrees with the horizontal direction. The inventor finds that, through setting up this angle with first air nozzle and first coal gas spout for the two can spray each other, and the mixed effect of directly spouting and the production of bigger injection angle is more violent, thereby is showing and is improving combustion efficiency, and then effectively forms reducing atmosphere on the material surface of furnace body, and the flue gas of reducing atmosphere presses close to the molten bath surface simultaneously and plays the guard action to the inside material of the molten bath that needs reducing atmosphere in the smelting process, thereby effectively avoids smelting the oxidation loss of burning to the furnace body in-process.
According to an embodiment of the present invention, the gap between the first opening 12 and the first burner 200 may be filled with a fiber mat. Therefore, the heat loss can be effectively avoided.
The second burner 300: according to an embodiment of the present invention, the first burner 300 may be located in the second opening 13, and according to an embodiment of the present invention, the second burner 300 has a second air nozzle 31 and a second gas nozzle 32.
According to an embodiment of the present invention, the second air jets 31 and the second gas jets 32 may have an elliptical shape.
According to the embodiment of the invention, the second air nozzle 31 is positioned above the second gas nozzle 32 in the vertical direction, and the direction of the second air nozzle 31 and the direction of the second gas nozzle 32 respectively and independently form an included angle of 5-10 degrees with the horizontal direction. The inventor discovers, through setting up this angle with second air nozzle and second coal gas spout for the two can spray each other, it is more violent with the mixed effect that bigger injection angle produced to directly spout, thereby show improvement combustion efficiency, and then effectively form reducing atmosphere on the material surface of furnace body, the flue gas of reducing atmosphere presses close to the molten bath surface simultaneously and plays the guard action to the inside material of the molten bath that needs reducing atmosphere among the smelting process, thereby further effectively avoid smelting the in-process to the oxidation scaling loss of furnace body.
According to the embodiment of the present invention, the gap between the second opening 13 and the second burner 300 may be filled with fiber felt. Therefore, the heat loss can be effectively avoided.
First thermal storage device 400: according to an embodiment of the present invention, the first thermal storage device 400 has a first housing 40, and according to a specific embodiment of the present invention, a first thermal storage space 41 is defined in the first housing 40.
According to the embodiment of the invention, the first heat accumulation space 41 is provided with a left settling chamber (not shown) and a left heat accumulator (not shown) in sequence along the direction away from the furnace body 100, wherein the left settling chamber comprises a first settling chamber 43 and a second settling chamber 45, and the left heat accumulator comprises a first air heat accumulator 42 and a first gas heat accumulator 44.
According to an embodiment of the invention, the first air regenerator 42 is connected to the first settling chamber 43 and communicates with the smelting space 10 via the first air injection ports 21 and is adapted to feed air into the smelting space or to recover waste heat after settling of the flue gas.
According to an embodiment of the present invention, the first thermal storage device 400 and the first aperture 12 may be connected by a first flange (not shown). Therefore, the system is more convenient to maintain and replace.
According to an embodiment of the present invention, the first air thermal mass 42 defines therein a first high temperature section 46 and a first low temperature section 47, and according to a specific embodiment of the present invention, the first high temperature section 46 is adjacent to the first settling chamber 43.
According to an embodiment of the present invention, the upper portion of the first high temperature section 46 may be filled with ceramic pellets, and the middle-lower portion of the first high temperature section 46 and the first low temperature section 47 may be filled with honeycomb ceramics. It should be explained that "the upper portion of the first high temperature section" may be understood as a position inside the first high temperature section near the top portion, and "the middle lower portion of the first high temperature section" may be understood as a space inside the first high temperature section other than the upper portion. The inventor finds that by adopting the ceramic pellets in the upper part of the first high-temperature section and adopting the honeycomb ceramic in the middle-lower part of the first high-temperature section and the first low-temperature section, the blockage of the high-temperature section can be effectively avoided, the heat transfer efficiency can be obviously improved, and the heat recovery efficiency of the flue gas is higher under the condition of the same volume and the same heat transfer time.
According to an embodiment of the invention, the first gas heat accumulator 44 is connected to the second settling chamber 45 and communicates with the smelting space 10 via the first gas injection ports 22 and is adapted to supply gas into the smelting space or to recover waste heat after settling of the flue gas.
According to an embodiment of the present invention, the first gas heat accumulator 44 defines therein a second high temperature section 48 and a second low temperature section 49, and according to a specific embodiment of the present invention, the second high temperature section 48 is adjacent to the second settling chamber 45.
According to an embodiment of the present invention, the upper portion of the second high temperature section 48 may be filled with ceramic pellets, and the middle-lower portion of the second high temperature section 48 and the second low temperature section 49 may be filled with honeycomb ceramic. It should be explained that "the upper portion of the second high temperature section" may be understood as a position inside the second high temperature section near the top portion, and "the middle-lower portion of the second high temperature section" may be understood as a space inside the second high temperature section other than the upper portion. The inventor finds that by adopting the ceramic pellets in the upper part of the second high-temperature section and adopting the honeycomb ceramic in the middle-lower part of the second high-temperature section and the second low-temperature section, not only can the blockage of the high-temperature section be effectively avoided, but also the recovery efficiency of the heat of the flue gas can be further improved.
According to an embodiment of the present invention, the first housing 40 may be provided with a first air inlet 401 and a first gas inlet 402, the first air inlet 401 being connected to the first air heat accumulator 42 and the first gas inlet 402 being connected to the first gas heat accumulator 44.
According to an embodiment of the invention, the first settling chamber and the second settling chamber may employ a cyclone separator for dedusting the flue gas containing the dust housing.
The inventor finds that the blockage of the heat accumulator by the smoke can be effectively avoided by adopting the heat accumulation device with the settling chamber, thereby greatly ensuring the working condition of the heat accumulator, reducing the maintenance and overhaul costs of the heat accumulator, thereby remarkably prolonging the service life of the heat storage device, simultaneously combining the ceramic pellet heat accumulator and the honeycomb ceramic heat accumulator for use, can obviously improve the waste heat recovery efficiency of the flue gas, and the combined heat accumulator has higher heat exchange efficiency, thereby transferring the waste heat in the heat accumulator to the cold air and the cold coal gas to the maximum extent, leading the air and the coal gas passing through the heat accumulator to approach the furnace temperature, the fuel gas is mixed with the fuel gas entering the furnace and then quickly and fully combusted, so that the temperature of the hearth is quickly increased, the temperature field of the hearth is uniform, the heating capacity is improved, the heating period is shortened, thereby remarkably improving the productivity and reducing the temperature of the flue gas passing through the heat accumulator to below 180 ℃.
Second heat storage device 500: the second thermal storage device 500 has a second casing 50 according to an embodiment of the present invention, and the second casing 50 defines a second thermal storage space 51 therein according to a specific embodiment of the present invention.
According to the embodiment of the present invention, the second heat accumulation space 51 has therein a right settling chamber (not shown) including the third settling chamber 53 and the fourth settling chamber 55 and a right heat accumulator (not shown) including the second air heat accumulator 52 and the second gas heat accumulator 54 in this order in a direction away from the furnace body 100.
According to an embodiment of the invention, the second air regenerator 52 is connected to the third settling chamber 53 and communicates with the smelting space 10 via the second air jets 31 and is adapted to feed air into the smelting space or to recover waste heat after settling of the flue gas.
According to an embodiment of the present invention, the second thermal storage device 500 and the second aperture 13 may be connected by a second flange (not shown). Therefore, the system is more convenient to maintain and replace.
According to an embodiment of the present invention, the second air thermal mass 52 defines therein a third high temperature section 56 and a third low temperature section 57, and according to a specific embodiment of the present invention, the third high temperature section 56 is adjacent to the third settling chamber 53.
According to an embodiment of the present invention, the upper portion of the third high temperature section 56 may be filled with ceramic pellets, and the middle-lower portion of the third high temperature section 56 and the third low temperature section 57 may be filled with honeycomb ceramics. It should be explained that "the upper portion of the third high temperature section" may be understood as a position inside the third high temperature section near the top portion, and "the middle lower portion of the third high temperature section" may be understood as a space inside the third high temperature section other than the upper portion. The inventor finds that by adopting the ceramic pellets in the upper part of the third high-temperature section and adopting the honeycomb ceramics in the middle-lower part of the third high-temperature section and the third low-temperature section, the blockage of the high-temperature section can be effectively avoided, and the recovery efficiency of the heat of the flue gas can be further improved.
According to an embodiment of the invention, the second gas heat accumulator 54 is connected to the fourth settling chamber 55 and communicates with the smelting space 10 via the second gas injection ports 32 and is adapted to supply gas into the smelting space or to recover waste heat after settling of the flue gas.
According to an embodiment of the present invention, the second gas heat accumulator 54 defines therein a fourth high temperature section 58 and a fourth low temperature section 59, and according to an embodiment of the present invention, the fourth high temperature section 58 is adjacent to the fourth settling chamber 55.
According to an embodiment of the present invention, an upper portion of the fourth high temperature section 58 may be filled with ceramic pellets, and a middle-lower portion of the fourth high temperature section 58 and the fourth low temperature section 59 may be filled with honeycomb ceramics. It should be explained that "the upper portion of the fourth high temperature section" may be understood as a position inside the fourth high temperature section near the top portion, and "the middle-lower portion of the fourth high temperature section" may be understood as a space inside the fourth high temperature section other than the upper portion. The inventor finds that by adopting ceramic balls in the upper part of the fourth high-temperature section and adopting honeycomb ceramics in the middle-lower part of the fourth high-temperature section and the fourth low-temperature section, the blockage of the high-temperature section can be effectively avoided, and the recovery efficiency of the heat of the flue gas can be further improved
According to an embodiment of the present invention, the second casing 50 may be provided with a second air inlet 501 and a second gas inlet 502, wherein the second air inlet 501 is connected to the second air heat accumulator 52, and the second gas inlet 502 is connected to the second gas heat accumulator 54.
According to an embodiment of the invention, the third settling chamber and the fourth settling chamber may employ a cyclone separator for dedusting the flue gas containing the dust housing.
According to an embodiment of the present invention, the first and second heat storage devices 400 and 500 may be symmetrically distributed on both sides of the furnace body 100.
First air three-way valve 600: the first air three-way valve 600 has a first air valve 601, a first air exchanging valve 602, a first air inlet 603, a first air exhaust outlet 604, and a first air outlet 605 according to an embodiment of the present invention, and the first air outlet 605 is connected to the first air inlet 401 according to an embodiment of the present invention.
First gas three-way valve 700: the first gas three-way valve 700 has a first gas valve 701, a first gas scavenging valve 702, a first gas inlet 703, a first gas exhaust outlet 704, and a first gas outlet 705 according to an embodiment of the present invention, and the first gas outlet 705 is connected to the first gas inlet 402 according to an embodiment of the present invention.
Second air three-way valve 800: the second air three-way valve 800 has a second air valve 801, a second air exchanging valve 802, a second air inlet 803, a second air exhaust outlet 804, and a second air outlet 805, according to an embodiment of the present invention, the second air outlet 805 being connected to the second air inlet 501, according to an embodiment of the present invention.
Second gas three-way valve 900: the second gas three-way valve 900 has a second gas valve 901, a second gas scavenging valve 902, a second gas inlet 903, a second gas exhaust outlet 904, and a second gas outlet 905, and the second gas outlet 905 is connected to the second gas inlet 502 according to an embodiment of the present invention.
Specifically, when the second heat storage device stores heat, a first air valve and a first gas valve are opened, a second air valve and a second gas valve are closed, air enters a first air three-way valve from a first air inlet, a first air scavenging valve closes a first air waste gas outlet, so that the air enters the first heat storage device from the first air outlet and enters the smelting space through a first air nozzle, meanwhile, gas enters a first gas three-way valve from a first gas inlet, a first gas scavenging valve closes a first gas waste gas outlet, so that the gas enters the first heat storage device from the first gas outlet and enters the smelting space through a first gas nozzle, then the flue gas generated in the smelting space enters the second heat storage device through a second air nozzle and a second gas nozzle, so that the residual heat of the flue gas is absorbed by a heat accumulator in the second heat storage device, and then the flue gas enters the second air three-way valve and the second gas three-way valve through the second air inlet and the second gas inlet respectively A second air control valve in the second air three-way valve closes the second air inlet, a second gas control valve in the second gas three-way valve closes the second gas inlet, so that the flue gas is discharged through the second air waste gas outlet and the second gas waste gas outlet, when the second heat storage device finishes heat storage, the first air valve and the first gas valve are closed, the second air valve and the second gas valve are opened, so that the air enters the second air three-way valve through the second air inlet, the second air scavenging valve closes the second air waste gas outlet, so that the air enters the second heat storage device through the second air inlet, so that the air fully absorbs the waste heat in the second heat storage device, the preheated air enters the smelting space through the second air nozzle, meanwhile, the gas enters the second gas three-way valve through the second gas inlet, and the second gas waste gas outlet is closed through the second gas scavenging valve, and then the flue gas enters a first air three-way valve and a first coal gas three-way valve through a first air inlet and a first coal gas inlet respectively, a first air control valve in the first air three-way valve closes the first air inlet, a first coal gas control valve in the first coal gas three-way valve closes the first coal gas inlet, so that the flue gas is discharged through a first air waste gas outlet and a first coal gas waste gas outlet, and the above operations are repeated after the first heat storage device finishes heat storage.
According to the reduction smelting heat accumulating type combustion system provided by the embodiment of the invention, the independent burner is used, compared with the traditional system formed by integral casting, the damage to the furnace body when the burner is replaced can be effectively avoided, the gas and the air are supplied into the furnace body from the same side of the furnace body, the air and the gas are fully mixed, the combustion efficiency is obviously improved, compared with the mode that the air and the gas are respectively supplied to two sides, the local oxidation of materials can be effectively avoided, meanwhile, the ceramic pellet heat accumulator and the honeycomb ceramic heat accumulator are combined for heat accumulation in the heat accumulation device, the system structure is more compact, the heat accumulation and heat release speed is high, the waste heat recovery efficiency is obviously improved, the energy utilization rate is further improved, in addition, the sedimentation chamber is arranged in the heat accumulation device, the particles in the flue gas can be effectively removed, and the blockage of the heat accumulator is effectively avoided, thereby ensuring the stable operation of the system.
Referring to fig. 3, the reduction smelting regenerative combustion system according to the embodiment of the present invention further includes:
flue gas recovery unit 1000: according to the embodiment of the invention, the flue gas recovery device 1000 is respectively connected with the first air waste gas outlet 604, the first coal gas waste gas outlet 704, the second air waste gas outlet 804 and the second coal gas waste gas outlet 904, and is adapted to process flue gas after waste heat recovery.
Control device 1100: according to an embodiment of the present invention, the control device 1100 is connected to the first heat storage device 400, the second heat storage device 500, the first air three-way valve 600, the first gas three-way valve 700, the second air three-way valve 800, and the second gas three-way valve 900, respectively, and is adapted to control the opening and closing of the first air valve, the first gas valve, the second air valve, and the second gas valve according to the temperatures of the first air heat accumulator, the first gas heat accumulator, the second air heat accumulator, and the second gas heat accumulator in the first heat storage device and the second heat storage device, so that the first heat storage device and the second heat storage device periodically perform heat storage and heat release.
In another aspect of the invention, the invention provides a method for smelting by adopting the reduction smelting regenerative combustion system. According to an embodiment of the invention, the method comprises:
(1) igniting the gas in the smelting space of the furnace body by using an ignition burner;
(2) opening a first air valve and a first gas valve through a control device, closing a second air valve and the first gas valve, enabling air to sequentially pass through a first air heat accumulator and a first settling chamber in a first heat storage device and enter a smelting space through a first air nozzle on a first burner nozzle, enabling gas to sequentially pass through a first gas heat accumulator and a second settling chamber in the first heat storage device and enter the smelting space through a first gas nozzle on the first burner nozzle, so that the gas and the air are combusted to generate reducing gas, and reducing materials in the smelting space by using the reducing gas to obtain flue gas;
(3) the flue gas passes through a second air nozzle and a second coal gas nozzle on a second burner and respectively and sequentially enters a third settling chamber and a second air heat accumulator, a fourth settling chamber and a second air heat accumulator in a second heat storage device so as to remove particulate matters in the flue gas and recover the waste heat of the flue gas;
(4) the first air valve and the first gas valve are closed through the control device, and the second air valve and the second gas valve are opened, so that the air and the gas are preheated by using the waste heat recovered in the second heat storage device, and the preheated air and the preheated gas are obtained;
(5) burning the preheated air and coal gas in a smelting space to generate reducing gas, and reducing materials in the smelting space by using the reducing gas so as to obtain flue gas;
(6) the method comprises the following steps that flue gas passes through a first air nozzle and a first coal gas nozzle on a first burner and sequentially enters a first settling chamber and a first air heat accumulator, a second settling chamber and a first air heat accumulator in a first heat storage device respectively so as to remove particulate matters in the flue gas and recover waste heat of the flue gas;
(7) and (4) repeating the steps (2) to (6).
According to the smelting method provided by the embodiment of the invention, the reduction smelting heat accumulating type combustion system is used for smelting, so that the damage to the furnace body when the burner is replaced can be effectively avoided, the gas and the air are supplied into the furnace body from the same side of the furnace body, the air and the gas are fully mixed, the combustion efficiency is obviously improved, and compared with the mode that the air and the gas are respectively supplied to two sides, the partial oxidation of materials can be effectively avoided, the system structure is more compact, the heat accumulation and heat release speed is high, the waste heat recovery efficiency is obviously improved, the energy utilization rate is improved, in addition, particles in the flue gas can be effectively removed, the blockage of a heat accumulator is effectively avoided, and the stable operation of the system is further ensured.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (7)

1. A regenerative combustion system for reduction smelting is characterized by comprising:
the smelting furnace comprises a furnace body, a furnace body and a smelting furnace, wherein the furnace body defines a smelting space, and an ignition burner, a first opening, a second opening and a material inlet are arranged on the side wall of the furnace body;
the first burner is positioned in the first opening and provided with a first air nozzle and a first gas nozzle;
the second burner is positioned in the second opening and provided with a second air nozzle and a second gas nozzle;
a first thermal storage device, the first thermal storage device comprising:
the smelting furnace comprises a first shell, a first heat storage space is defined in the first shell, a left settling chamber and a left heat accumulator are sequentially arranged in the first heat storage space along the direction far away from the furnace body, the left settling chamber comprises a first settling chamber and a second settling chamber, the left heat accumulator comprises a first air heat accumulator and a first coal gas heat accumulator, the first air heat accumulator is connected with the first settling chamber and communicated with the smelting space through a first air nozzle, and the first coal gas heat accumulator is connected with the second settling chamber and communicated with the smelting space through the first coal gas nozzle;
a first air inlet formed on the first housing, the first air inlet being coupled to the first air thermal mass;
the first gas inlet is formed in the first shell and connected with the first gas heat accumulator;
a second thermal storage device that includes:
a second shell, a second heat storage space is defined in the second shell, a right settling chamber and a right heat accumulator are sequentially arranged in the second heat storage space along the direction far away from the furnace body, the right settling chamber comprises a third settling chamber and a fourth settling chamber, the right heat accumulator comprises a second air heat accumulator and a second coal gas heat accumulator, the second air heat accumulator is connected with the third settling chamber and communicated with the smelting space through a second air nozzle, and the second coal gas heat accumulator is connected with the fourth settling chamber and communicated with the smelting space through a second coal gas nozzle;
a second air inlet formed in the second housing, the second air inlet coupled to the second air thermal mass;
the second gas inlet is formed in the second shell and connected with the second gas heat accumulator;
a first air three-way valve having a first air valve, a first air scavenging valve, a first air inlet, a first air exhaust outlet, and a first air outlet, the first air outlet connected to the first air inlet;
the first gas three-way valve is provided with a first gas valve, a first gas scavenging valve, a first gas inlet, a first gas waste gas outlet and a first gas outlet, and the first gas outlet is connected with the first gas inlet;
a second air three-way valve having a second air valve, a second air scavenging valve, a second air inlet, a second air exhaust outlet, and a second air outlet, the second air outlet being connected to the second air inlet; and
a second gas three-way valve having a second gas valve, a second gas scavenging valve, a second gas inlet, a second gas exhaust outlet, and a second gas outlet, the second gas outlet being connected to the second gas inlet,
wherein,
a first high-temperature section and a first low-temperature section are defined in the first air heat accumulator, the first high-temperature section is close to the first settling chamber, a second high-temperature section and a second low-temperature section are defined in the first gas heat accumulator, the second high-temperature section is close to the second settling chamber, ceramic pellets are filled at the upper parts of the first high-temperature section and the second high-temperature section, honeycomb ceramics are filled at the middle lower part of the first high-temperature section, the middle lower part of the second high-temperature section, the first low-temperature section and the second low-temperature section,
a third high-temperature section and a third low-temperature section are defined in the second air heat accumulator, the third high-temperature section is close to the third settling chamber, a fourth high-temperature section and a fourth low-temperature section are defined in the second gas heat accumulator, the fourth high-temperature section is close to the fourth settling chamber, ceramic pellets are filled at the upper parts of the three high-temperature section and the fourth high-temperature section, honeycomb ceramics are filled at the middle lower part of the third high-temperature section, the middle lower part of the fourth high-temperature section, the third low-temperature section and the fourth low-temperature section,
the first air nozzle direction, the first gas nozzle direction, the second air nozzle direction and the second gas nozzle direction respectively and independently form an included angle of 5-10 degrees with the horizontal direction,
the first air nozzle, the first gas nozzle, the second air nozzle and the second gas nozzle are oval, the first air nozzle is located above the first gas nozzle, and the second air nozzle is located above the second gas nozzle.
2. The reduction and smelting regenerative combustion system of claim 1, further comprising:
and the flue gas recovery device is respectively connected with the first air waste gas outlet, the first coal gas waste gas outlet, the second air waste gas outlet and the second coal gas waste gas outlet.
3. A reduction and smelting heat accumulating type combustion system according to claim 1, wherein the first heat accumulating device is connected to the first opening through a first flange, and the second heat accumulating device is connected to the second opening through a second flange.
4. The regenerative combustion system for reduction smelting according to claim 1, wherein the gap between the first burner and the first opening and the gap between the second burner and the second opening are filled with fiber mats independently.
5. The reduction smelting regenerative combustion system according to claim 1, wherein the first regenerative apparatus and the second regenerative apparatus are symmetrically distributed on both sides of the furnace body.
6. The reduction and smelting regenerative combustion system of claim 1, further comprising:
and the control device is respectively connected with the first heat storage device, the second heat storage device, the first air three-way valve, the first gas three-way valve, the second air three-way valve and the second gas three-way valve, and is suitable for controlling the opening and closing of the first air valve, the first gas valve, the second air valve and the second gas valve according to the temperatures of the first air heat accumulator, the first gas heat accumulator, the second air heat accumulator and the second gas heat accumulator in the first heat storage device and the second heat storage device.
7. A method for smelting by adopting the reduction smelting heat accumulating type combustion system of any one of claims 1 to 6, which is characterized by comprising the following steps:
(1) igniting the gas in the smelting space of the furnace body by using an ignition burner;
(2) opening a first air valve and a first gas valve through a control device, closing a second air valve and the first gas valve, enabling air to sequentially pass through a first air heat accumulator and a first settling chamber in a first heat storage device and enter a smelting space through a first air nozzle on a first burner nozzle, enabling gas to sequentially pass through a first gas heat accumulator and a second settling chamber in the first heat storage device and enter the smelting space through a first gas nozzle on the first burner nozzle, so that the gas and the air are combusted to generate reducing gas, and reducing materials in the smelting space by using the reducing gas to obtain flue gas;
(3) the flue gas passes through a second air nozzle and a second coal gas nozzle on a second burner and respectively and sequentially enters a third settling chamber and a second air heat accumulator, a fourth settling chamber and a second coal gas heat accumulator in a second heat storage device so as to remove particles in the flue gas and recover the waste heat of the flue gas;
(4) the first air valve and the first gas valve are closed through the control device, and the second air valve and the second gas valve are opened, so that the waste heat recovered in the second heat storage device is used for preheating the air and the gas, and the preheated air and the preheated gas are obtained;
(5) burning the preheated air and coal gas in a smelting space to generate reducing gas, and reducing the materials in the smelting space by using the reducing gas so as to obtain flue gas;
(6) the flue gas passes through a first air nozzle and a first coal gas nozzle on a first burner and sequentially enters a first settling chamber and a first air heat accumulator, a second settling chamber and a first coal gas heat accumulator in a first heat storage device respectively so as to remove particles in the flue gas and recover the waste heat of the flue gas;
(7) and (4) repeating the steps (2) to (6).
CN201510900684.5A 2015-12-09 2015-12-09 Reducing and smelting regenerative combustion system and the method smelted using the system Active CN105402732B (en)

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