CN112094654A - Hot-blast furnace and have its coal pyrolysis device - Google Patents
Hot-blast furnace and have its coal pyrolysis device Download PDFInfo
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- CN112094654A CN112094654A CN202010822608.8A CN202010822608A CN112094654A CN 112094654 A CN112094654 A CN 112094654A CN 202010822608 A CN202010822608 A CN 202010822608A CN 112094654 A CN112094654 A CN 112094654A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
- C10B47/28—Other processes
- C10B47/30—Other processes in rotary ovens or retorts
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Abstract
The invention relates to the technical field of rotary furnace coal pyrolysis quality improvement, in particular to a hot blast stove and a coal pyrolysis device with the same. A hot blast stove comprising: the first chamber is provided with a fuel inlet and a combustion-supporting gas inlet; the combustion chamber is arranged at the outlet of the first chamber and is separated from the first chamber through a first partition plate, and a first channel allowing primary flue gas generated by combustion reaction of fuel and combustion-supporting gas to enter the combustion chamber is arranged on the first partition plate; and the first circulating flue gas inlet is communicated with the combustion chamber and used for mixing the first circulating flue gas with the primary flue gas and then combusting the mixture again. The fuel and the combustion-supporting gas are firstly conveyed to the first channel through the first chamber to generate an oxygen deficiency reaction, when the first circulating flue gas is mixed with the first circulating flue gas, the incompletely combusted fuel in the first circulating flue gas and the oxygen in the first circulating flue gas can be combusted again, and the oxygen in the first circulating flue gas is consumed to reduce the oxygen content in the first circulating flue gas.
Description
Technical Field
The invention relates to the technical field of rotary furnace coal pyrolysis quality improvement, in particular to a hot blast stove and a coal pyrolysis device with the same.
Background
The rotary furnace coal pyrolysis quality-improving technology is used for preparing tar, semicoke and coal gas from coal. The drying rotary furnace and the pyrolysis rotary furnace are core devices of the technology. The drying rotary furnace is used for drying coal, and the pyrolysis rotary furnace is used for pyrolyzing coal. The hot blast stove provides heating medium, namely hot flue gas, for the drying rotary furnace and the pyrolysis rotary furnace. After the hot flue gas heats the rotary furnace, the temperature is still very high, and the hot flue gas needs to return to the hot blast stove for heat recovery.
The pyrolysis rotary furnace is generally of an external heating type structure, and high-temperature flue gas is introduced into a jacket of the pyrolysis rotary furnace to heat the pyrolysis rotary furnace. Because the jacket and the inner cylinder of the rotary furnace are in dynamic seal, part of air can leak into the jacket in the operation process, so that the oxygen content of the flue gas after heat exchange is increased. During the circulation of hot flue gases, the oxygen content in the flue gas system is increasing continuously. And the drying rotary furnace adopts an internal heating type structure, hot flue gas is in direct contact with coal, and the hot flue gas with high oxygen content is directly used for the internal heating type drying rotary furnace to cause oxidation reaction in the drying rotary furnace, so that the operation safety of the rotary furnace can be seriously influenced when the reaction is severe.
Disclosure of Invention
Therefore, the invention aims to overcome the defect that the oxygen content in hot flue gas in the rotary furnace coal pyrolysis quality-improving process in the prior art is continuously accumulated along with the circulation of the hot flue gas to influence the operation safety of the rotary furnace, and provides the hot blast furnace and the coal pyrolysis device with the same.
In order to solve the above technical problem, the present invention provides a hot blast stove, comprising:
the first chamber is provided with a fuel inlet and a combustion-supporting gas inlet;
the combustion chamber is arranged at the outlet of the first chamber and is separated from the first chamber through a first partition plate, and a first channel allowing primary flue gas generated by combustion reaction of fuel and combustion-supporting gas to enter the combustion chamber is arranged on the first partition plate;
and the first circulating flue gas inlet is communicated with the combustion chamber and used for mixing the first circulating flue gas with the primary flue gas and then combusting the mixture again.
Preferably, still include the second cavity of setting through second baffle and first cavity separation, the second cavity is located between first cavity and the combustion chamber, install fuel gas pipe and combustion-supporting trachea in the second cavity, fuel gas pipe one end and fuel inlet intercommunication, the other end extends to in the first passageway, combustion-supporting trachea one end and first cavity intercommunication, the other end extends to in the first passageway, the second cavity is equipped with first circulation flue gas entry, be equipped with on the first baffle with the second passageway that first circulation flue gas entry intercommunication set up.
Preferably, the combustion-supporting gas pipe is sleeved on the periphery of the fuel gas pipe.
Preferably, the fuel gas pipe and the combustion-supporting gas pipe are both provided with a plurality of gas pipes, and the plurality of fuel gas pipes and the plurality of combustion-supporting gas pipes are all annularly and uniformly distributed.
Preferably, the end of the fuel gas pipe extending to the outlet of the first passage is provided with a burner, the outlet of the first passage is provided with a burner block, and the burner block is arranged around the burner.
Preferably, the device further comprises a mixing chamber connected with the combustion chamber, and the mixing chamber is provided with a second circulating flue gas inlet.
Preferably, the spiral shell is arranged at the periphery of the mixing chamber, a plurality of distribution pipes are communicated between the spiral shell and the mixing chamber, and the second circulating flue gas inlet is arranged at the inlet of the spiral shell.
Preferably, the side wall of the combustion chamber is provided with a viewing aperture and a flame detector.
Preferably, a pilot lamp is installed at the outlet of the fuel gas pipe.
The invention also provides a coal pyrolysis device which is provided with the hot blast stove.
The technical scheme of the invention has the following advantages:
1. the invention provides a hot blast stove, comprising: the first chamber is provided with a fuel inlet and a combustion-supporting gas inlet; the combustion chamber is arranged at the outlet of the first chamber and is separated from the first chamber through a first partition plate, and a first channel allowing primary flue gas generated by combustion reaction of fuel and combustion-supporting gas to enter the combustion chamber is arranged on the first partition plate; and the first circulating flue gas inlet is communicated with the combustion chamber and used for mixing the first circulating flue gas with the primary flue gas and then combusting the mixture again.
The first chamber is separated independently by the first partition plate, and the first circulating flue gas which participates in circulation is directly introduced into the combustion chamber to perform combustion reaction by the first circulating flue gas inlet so as to reduce the oxygen content in the first circulating flue gas, so that the first circulating flue gas which participates in circulation is prevented from contacting with combustion-supporting gas before participating in combustion so as to mix more oxygen, and the difficulty of reducing the oxygen content in the first circulating flue gas is increased. The fuel and the combustion-supporting gas are firstly conveyed to the first channel through the first chamber, the combustion-supporting gas and the fuel are subjected to oxygen deficiency reaction by controlling the introduction amount of the combustion-supporting gas, so that the generated primary flue gas still contains the incompletely combusted fuel, when the primary circulating flue gas is mixed with the primary flue gas, the incompletely combusted fuel in the primary flue gas and the oxygen in the primary circulating flue gas can be combusted again, and the oxygen in the primary circulating flue gas is consumed to reduce the oxygen content in the circulating flue gas.
2. The hot blast stove provided by the invention further comprises a second cavity which is separated from the first cavity through a second partition plate, the second cavity is arranged between the first cavity and the combustion chamber, a fuel gas pipe and a combustion-supporting gas pipe are arranged in the second cavity, one end of the fuel gas pipe is communicated with the fuel inlet, the other end of the fuel gas pipe extends into the first channel, one end of the combustion-supporting gas pipe is communicated with the first cavity, the other end of the combustion-supporting gas pipe extends into the first channel, the second cavity is provided with a first circulating flue gas inlet, and the first partition plate is provided with a second channel which is communicated with the first circulating flue gas inlet. Through setting up the second cavity for the first circulation flue gas after participating in the circulation gets into the combustion chamber from the second passageway, and burns once more with the flue gas that forms behind fuel and the combustion-supporting gas burning, is convenient for control the input of first circulation flue gas, makes the first circulation flue gas after participating in the circulation can participate in the reaction completely and carry out abundant consumption in order to the oxygen in the flue gas.
3. The hot blast stove provided by the invention is provided with a plurality of fuel gas pipes which are uniformly distributed in a ring shape. Through arranging fuel gas pipe annular for the annular burning of the multi-beam flame that forms in the combustion chamber makes the temperature evenly distributed in the combustion chamber, avoids because local temperature is lower in the combustion chamber, and the unable oxygen that takes place the burning and lead to of regional gas is remained. The oxygen entering the combustion chamber can be ensured to react with the fuel, and the oxygen is fully consumed.
4. The hot blast stove provided by the invention further comprises a mixing chamber connected with the combustion chamber, and the mixing chamber is provided with a second circulating flue gas inlet. Part of the second circulating flue gas which participates in circulation enters the mixing chamber from the second circulating flue gas inlet to be mixed with the newly generated flue gas, the newly generated flue gas is cooled, the phenomenon that the newly generated flue gas is too high in temperature after the first circulating flue gas carrying part of heat is combusted again can be avoided, the temperature of the flue gas output from the hot blast stove is ensured to be suitable for participating in subsequent reaction,
drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of a low-oxygen hot blast stove provided in an embodiment of the present invention.
Fig. 2 is a sectional view taken along a-a in fig. 1.
Fig. 3 is a schematic structural view of a burner provided in an embodiment of the present invention.
Description of reference numerals: 1. a first chamber; 2. a second chamber; 3. a fuel inlet; 4. a combustion supporting gas inlet; 5. a first circulating flue gas inlet; 6. a fuel gas pipe; 7. a combustion chamber; 8. a second circulating flue gas inlet; 9. a helical housing; 10. a distribution pipe; 11. burning a nozzle; 12. a burner block; 13. a fire observation hole; 14. a flame detector; 15. a beacon light; 16. a first separator; 17. a second separator; 18. a mixing chamber; 19. a combustion-supporting gas pipe; 20. a first channel; 21. a second channel.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 3, the hot blast stove according to a specific embodiment of the present invention includes a burner, a combustion chamber, and a mixing chamber, which are sequentially connected from bottom to top, and a first chamber and a second chamber, which are completely separated by a second partition plate, are disposed in the burner.
As shown in fig. 3, the first chamber 1 is provided with a fuel inlet 3 and a combustion gas inlet 4. Second cavity 2 locates between first cavity 1 and combustion chamber 7, install fuel gas pipe 6 and combustion-supporting trachea 19 in the second cavity 2, 6 one end of fuel gas pipe and fuel inlet 3 intercommunication, the other end extends to in the first passageway 20, 19 one end of combustion-supporting trachea and first cavity 1 intercommunication, the other end extends to in the first passageway 20, second cavity 2 is equipped with first circulation flue gas entry 5, be equipped with the second passageway 21 that sets up with first circulation flue gas entry 5 intercommunication on the first baffle 16, second passageway 21 and combustion chamber 7 intercommunication set up for make first circulation flue gas and a flue gas after mixing burn once more.
Six fuel gas pipes 6 and six combustion-supporting gas pipes 19 are arranged, the six fuel gas pipes 6 and the six combustion-supporting gas pipes 19 are concentrically arranged, the fuel gas pipes 6 are sleeved with the combustion-supporting gas pipes 19, and the six fuel gas pipes 6 are uniformly distributed in an annular shape. Through arranging fuel gas pipe 6 ring shape for the annular burning of the multi-beam flame that forms in combustion chamber 7, the temperature evenly distributed who makes in the combustion chamber 7 avoids because local temperature is lower in the combustion chamber 7, and the unable oxygen that burns and lead to of taking place of regional gas is remained. The oxygen entering the combustion chamber 7 can be ensured to react with the fuel, and the oxygen is fully consumed. Burner 11 is installed to the one end that fuel gas pipe 6 extends to first passageway 20 export, and the exit of first passageway 20 is equipped with burner block 12, and burner block 12 is established around burner 11 to protect fuel gas pipe 6 and combustion-supporting trachea 19, avoid the high temperature of burner department to cause the damage to fuel gas pipe 6 and combustion-supporting trachea 19.
As shown in fig. 1, the combustion chamber 7 is arranged at the outlet of the second chamber 2 and is separated from the first chamber 1 by a first partition 16, the first partition 16 is provided with a first channel 20 for allowing the primary flue gas generated by the combustion reaction of the fuel and the combustion-supporting gas to enter the combustion chamber 7, and a second channel 21 for allowing the first circulating flue gas to enter the combustion chamber 7 to participate in combustion, and the second channel 21 is arranged around the first channel 20.
Two spiral shells 9 are axially arranged on the periphery of the mixing chamber 18, a plurality of distribution pipes 10 are communicated between the spiral shells 9 and the mixing chamber 18, three rows of the distribution pipes 10 are vertically arranged, and the distribution pipes are obliquely arranged upwards towards the direction of the mixing chamber 18. As shown in fig. 2, the inlet of the spiral housing 9 is provided with a second circulating flue gas inlet 8. Part of the second circulating flue gas participating in circulation enters the mixing chamber 18 from the periphery of the mixing chamber 18 through the plurality of distribution pipes 10 from the second circulating flue gas inlet 8, so that the flue gas with lower temperature uniformly enters the mixing chamber 18 to be mixed with the flue gas with higher temperature generated newly, the flue gas generated newly is cooled, the phenomenon that the temperature of the flue gas generated newly is too high after the first circulating flue gas carrying part of heat is combusted again can be avoided, and the temperature of the flue gas output from the hot blast stove is ensured to be suitable for participating in subsequent reaction.
The side wall of the combustion chamber 7 is also provided with a flame observation hole 13 for observing the flame state sprayed at the burner 11 by naked eyes and a flame detector 14 for monitoring the combustion condition in real time. The pilot burner 15 is installed at the outlet of the fuel gas pipe 6 to ensure that the flame at the outlet of the fuel gas pipe 6 is extinguished and then is ignited again. The number of the observation holes 13, the flame detectors 14, and the pilot lights 15 is six, and the six fuel gas pipes 6 are in one-to-one correspondence.
The first chamber 1 and the second chamber 2 are isolated by the second partition plate 17, so that the first circulating flue gas, the fuel and the combustion-supporting gas which participate in circulation can reach the first channel 20 to perform combustion reaction, the first circulating flue gas which participate in circulation can completely participate in reaction to fully consume the oxygen in the flue gas, and the oxygen content in the circulating flue gas is reduced. Through setting up different pipelines to first circulation flue gas, fuel and combustion-supporting gas, prevent to participate in the first circulation flue gas after the circulation before participating in the burning with the combustion-supporting gas contact and mix into more oxygen, increase the degree of difficulty that reduces the oxygen content in the circulation flue gas. The oxygen content in the circulating flue gas after circulating from the rotary kiln is 5%, the circulating flue gas is divided into two parts, one part takes 30% of the total flue gas amount, enters the second chamber 2 from the first circulating flue gas inlet 5, and is sprayed out from the second channel 21. The fuel and the air as the combustion-supporting gas are combusted to generate primary flue gas, the primary flue gas is sprayed out of the first channel 20, and the combustion-supporting gas and the fuel are subjected to oxygen deficiency reaction by controlling the introduction amount of the combustion-supporting gas, so that the generated primary flue gas still contains incompletely combusted fuel. When the first circulating flue gas with high oxygen content meets the first flue gas containing incompletely-reacted fuel, the incompletely-combusted fuel in the first flue gas and the oxygen in the first circulating flue gas are ignited by flame for combustion again, the oxygen in the first circulating flue gas is consumed to reduce the oxygen content in the first circulating flue gas, and the oxygen content of the flue gas output from the hot blast stove is controlled to be below 3%. The oxygen content in the flue gas is reduced to maintain the stable, continuous and safe operation of the rotary furnace, and the safety of personnel and equipment in the production process is ensured.
As an alternative embodiment, one end of the fuel gas pipe 6 extends to the first channel 20, the other end is communicated with the first chamber 1, the fuel and the combustion-supporting gas are introduced into the first chamber 1 together, mixed in the first chamber 1 and sprayed out from the fuel gas pipe 6, and combustion is performed at the burner 11 at the end of the fuel gas pipe 6.
The invention also provides a coal pyrolysis device which is provided with the hot blast stove provided in the first embodiment, wherein the outlet of the hot blast stove is connected with a drying rotary furnace and a pyrolysis rotary furnace, the flue gas outlet of the rotary furnace is respectively connected with a first circulating flue gas inlet 5 and a second circulating flue gas inlet 8 of the hot blast stove, and the two circulating flows from the rotary furnace are input into the hot blast stove to control the oxygen content in the circulating flue gas and the temperature of the flue gas output from the hot blast stove.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A hot blast stove, comprising:
a first chamber (1), the first chamber (1) being provided with a fuel inlet (3) and a combustion-supporting gas inlet (4);
the combustion chamber (7) is arranged at an outlet of the first chamber (1) and is separated from the first chamber (1) through a first partition plate (16), and a first channel (20) allowing primary flue gas generated by combustion reaction of fuel and combustion-supporting gas to enter the combustion chamber (7) is arranged on the first partition plate (16);
and the first circulating flue gas inlet (5) is communicated with the combustion chamber (7) and is used for mixing the first circulating flue gas with the primary flue gas and then combusting the mixture again.
2. The stove according to claim 1, further comprising a second chamber (2) separated from the first chamber (1) by a second partition (17), the second chamber (2) being arranged between the first chamber (1) and the combustion chamber (7), a fuel gas pipe (6) and a combustion-supporting gas pipe (19) are arranged in the second cavity (2), one end of the fuel gas pipe (6) is communicated with the fuel inlet (3), the other end of the fuel gas pipe extends into the first channel (20), one end of the combustion-supporting gas pipe (19) is communicated with the first cavity (1), the other end of the combustion-supporting gas pipe extends into the first channel (20), the second chamber (2) is provided with a first circulating flue gas inlet (5), and a second channel (21) communicated with the first circulating flue gas inlet (5) is arranged on the first partition plate (16).
3. The hot blast stove according to claim 2, wherein the combustion-supporting gas pipe (19) is fitted around the periphery of the fuel gas pipe (6).
4. The hot blast stove according to claim 3, wherein a plurality of fuel gas pipes (6) and a plurality of combustion-supporting gas pipes (19) are provided, and a plurality of fuel gas pipes (6) and a plurality of combustion-supporting gas pipes (19) are uniformly distributed in a ring shape.
5. The hot blast stove according to any one of claims 2 to 4, wherein the end of the fuel gas pipe (6) extending to the outlet of the first channel (20) is provided with a burner (11), and the outlet of the first channel (20) is provided with a burner block (12), and the burner block (12) is arranged around the burner (11).
6. The hot blast stove according to any one of claims 1 to 5, further comprising a mixing chamber (18) connected to the combustion chamber (7), the mixing chamber (18) being provided with a second circulating flue gas inlet (8).
7. The hot blast stove according to claim 6, characterized in that a spiral shell (9) is provided around the mixing chamber (18), a plurality of distribution pipes (10) are connected between the spiral shell (9) and the mixing chamber (18), and the second circulating flue gas inlet (8) is provided at the inlet of the spiral shell (9).
8. The hot blast stove according to any of claims 1 to 7, characterized in that the side wall of the combustion chamber (7) is provided with a viewing aperture (13) and a flame detector (14).
9. The hot blast stove according to any of claims 2 to 5, characterized in that an incandescent lamp (15) is mounted at the outlet of the fuel gas pipe (6).
10. A coal pyrolysis apparatus, characterized by having a hot blast stove according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010822608.8A CN112094654B (en) | 2020-08-14 | 2020-08-14 | Hot-blast furnace and have its coal pyrolysis device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010822608.8A CN112094654B (en) | 2020-08-14 | 2020-08-14 | Hot-blast furnace and have its coal pyrolysis device |
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| Publication Number | Publication Date |
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| CN112094654A true CN112094654A (en) | 2020-12-18 |
| CN112094654B CN112094654B (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010822608.8A Active CN112094654B (en) | 2020-08-14 | 2020-08-14 | Hot-blast furnace and have its coal pyrolysis device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112923720A (en) * | 2021-02-04 | 2021-06-08 | 湖南鼎玖能源环境科技股份有限公司 | Hot-blast furnace and slewing equipment |
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| CN112923720A (en) * | 2021-02-04 | 2021-06-08 | 湖南鼎玖能源环境科技股份有限公司 | Hot-blast furnace and slewing equipment |
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| Publication number | Publication date |
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| CN112094654B (en) | 2022-04-15 |
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