CN108753314B - Combustion device and combustion method for vertical flue of coke oven - Google Patents

Combustion device and combustion method for vertical flue of coke oven Download PDF

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Publication number
CN108753314B
CN108753314B CN201810496907.XA CN201810496907A CN108753314B CN 108753314 B CN108753314 B CN 108753314B CN 201810496907 A CN201810496907 A CN 201810496907A CN 108753314 B CN108753314 B CN 108753314B
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combustion
air
vertical
vertical flue
flue
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CN108753314A (en
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冯俊小
白子琦
赵玉杰
徐钱
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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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
    • C10B21/00—Heating of coke ovens with combustible gases
    • C10B21/10—Regulating and controlling the combustion
    • C10B21/16—Regulating and controlling the combustion by controlling or varying the openings between the heating flues and the regenerator flues
    • 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
    • C10B21/00—Heating of coke ovens with combustible gases
    • C10B21/10—Regulating and controlling the combustion
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Coke Industry (AREA)

Abstract

The invention provides a combustion device and a combustion method for a vertical flue of a coke oven, belonging to the technical field of metallurgy. The device sets up the cavity in the vertical flue partition wall on the basis of original coke oven vertical flue, and the cavity lower extreme links to each other with the dispersion wind supply pipe who is located the bottom of vertical flue, and the even spout of cavity transverse connection multirow, spout link up to vertical flue inside. During combustion, one part of combustion-supporting air is sprayed out from the bottom of the vertical flue and is mixed with fuel gas for combustion, then is mixed with flue gas coming from the waste gas circulation hole to form updraft, and the other part of combustion-supporting air enters the wall cavity from the dispersion air supply pipeline, enters the multiple rows of uniform nozzles along the wall cavity, then enters the flue from the multiple rows of uniform nozzles, and is mixed with mixed gas of the updraft for combustion to form a dispersion combustion form of flame curtain-shaped flame. The method can improve the uniformity of vertical flue heating and reduce the content of nitrogen oxides generated by combustion, and has remarkable economical efficiency compared with the subsequent SCR denitration of the coke oven flue gas.

Description

Combustion device and combustion method for vertical flue of coke oven
Technical Field
The invention relates to the technical field of metallurgy, in particular to a combustion device and a combustion method for a vertical flue of a coke oven.
Background
The coking industry is an important industry in national economy, and provides important raw materials and resources for other industries such as metallurgical chemistry, medicine, agriculture, national defense industry and the like.
In the coking process, the working principle is that each vertical flue in the vertical flue of the coke oven generates heat through burning coal gas and transmits the heat to an adjacent coking chamber, the coal in the coking chamber is heated to about 1000 ℃ under the condition of air isolation, and coke, coke oven gas and other coking chemical products are generated through thermal decomposition and coking. Although the existing vertical flue air and fuel gas segmented heating technology reduces the temperature difference between the upper part and the lower part of the vertical flue, the technology has a space for improvement on the temperature uniformity of the vertical flue, the content of nitrogen oxides in waste gas generated by combustion is still high, and in recent years, the state implements the policy of energy conservation and emission reduction, and in the heavy spot areas, NO is addedxThe discharge amount is required to be 150mg/m3Therefore, it is urgently needed to provide a set of low NO for enhancing the temperature uniformity of the vertical fluexThe combustion method and the combustion apparatus.
Disclosure of Invention
The invention aims to solve the technical problem of providing a combustion device and a combustion method for a vertical flue of a coke oven, which are preheated by a regeneratorGas and part of air are respectively sent into the vertical flue from a gas inlet and an air inlet below the vertical flue, are mixed with circulating waste gas, and then are sprayed upwards for combustion, and simultaneously the rest of air is supplied into the wall cavity from a dispersed air supply pipeline, is sprayed out from a plurality of rows of uniform nozzles and then is mixed with the mixed gas sprayed upwards, and is subjected to dispersed combustion in a flame curtain mode, so that the temperature uniformity of heating of the vertical flue is improved. Because the oxygen concentration is reduced in the mixed combustion process, the combustion temperature is also reduced at the same time, and the thermal NO is damagedxThe content of nitrogen oxides in the coke oven smoke is reduced.
The combustion device comprises a vertical flue partition wall, a first air nozzle, a wall cavity, a dispersed air supply pipeline, a waste gas circulation hole, a crossing hole, a coke oven gas nozzle, a blast furnace gas nozzle and a second air nozzle, wherein the wall cavity is arranged at the vertical flue partition wall, the wall cavity is horizontally connected with the first air nozzles with uniform rows, and the lower end of the wall cavity is communicated with the dispersed air supply pipeline through a pipeline.
Wherein, the air spout one is no less than 3 rows, and the quantity of every row of air spout is no less than 2.
The aperture of the first air nozzle is between 10mm and 40mm, the cross section of the first air nozzle is circular, square, rectangular or oval, the first air nozzle is gradually expanded along the jet flow direction, the horizontal distance between the first air nozzles is between 50mm and 250mm, the vertical distance between the first air nozzles is between 100 mm and 500mm, and the included angle between the first air nozzle and the horizontal direction is between 15 degrees and 75 degrees.
The waste gas circulation hole is arranged at a position 200mm higher than the bottom of the vertical flue.
The distance between the bottom of the cavity of the wall body and the bottom of the vertical fire channel is 800-1200 mm; the lowest distance between the air nozzle and the bottom of the vertical flue is 1500mm, and the highest distance between the air nozzle and the top of the vertical flue is 500 mm.
The combustion method adopting the combustion device specifically comprises the following steps: during combustion, gas and part of air are respectively sprayed out from a coke oven gas nozzle, a blast furnace gas nozzle and an air nozzle II at the bottom of the vertical flue and are mixed with waste gas from the waste gas circulation hole to be partially combusted, meanwhile, the rest of air is preheated and then sprayed out from the uniform rows of air nozzles I through a dispersion air supply pipeline and a wall cavity to be mixed with mixed gas of ascending air flow to realize air dispersion combustion, heat is transferred into the carbonization chamber from the waste gas generated by combustion through the vertical flue wall and then enters the descending flue through the crossing hole, the heat is discharged from the air and gas nozzles at the other side of the duplex flue, and after the direction is changed, the combustion process is opposite to the process.
The dispersion air supply pipeline not only can be filled with air, but also can be filled with fuel gas to carry out dispersion combustion.
The vertical flue gas comprises one or more of blast furnace gas, coke oven gas and high-coke mixed gas.
The air quantity sprayed out from the bottom and sprayed out from the multiple rows of uniform nozzles can be adjusted according to the actual working condition.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the original air sectional combustion mode is changed into multi-row uniform air jet dispersion combustion, the temperature uniformity of heating in the vertical flame path is greatly enhanced, the concentration of oxygen in combustion air is reduced in the combustion process, the combustion flame temperature is further reduced, and NO is destroyedxThe generation condition reduces the content of nitrogen oxide in the coke oven flue gas, and saves the cost of the subsequent SCR denitration of the coke oven flue gas.
Drawings
FIG. 1 is a schematic structural view of a combustion device of a vertical flue of a coke oven according to the present invention;
FIG. 2 is a left side view of a combustion apparatus of the vertical flue of the coke oven of the present invention.
Wherein: 1-vertical fire way partition wall; 2-air nozzle I; 3-a wall cavity; 4-a dispersed air supply pipeline; 5-exhaust gas circulation holes; 6-spanning pore; 7-a coke oven gas nozzle; 8-blast furnace gas nozzle; 9-air nozzle two.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a combustion device and a combustion method for a vertical flue of a coke oven.
As shown in fig. 1 and 2, the combustion device comprises a vertical flue partition wall 1, a first air nozzle 2, a wall cavity 3, a dispersion air supply pipeline 4, a waste gas circulation hole 5, a crossover hole 6, a coke oven gas nozzle (7), a blast furnace gas nozzle 8 and a second air nozzle 9; the device comprises a plurality of vertical flues, every two vertical flues form a duplex vertical flue, the upper part of the duplex vertical flue is provided with a crossing hole 6, the bottoms of the duplex vertical flues are communicated through a waste gas circulation hole 5, the bottom of each vertical flue is respectively provided with a coke oven gas nozzle 7, a blast furnace gas nozzle 8 and an air nozzle II 9, a vertical flue partition wall 1 is arranged between the vertical flues, a wall cavity 3 is arranged at the partition wall 1 of each vertical flue, the wall cavity 3 is horizontally connected with a plurality of rows of uniform air nozzles I2, and the vertical direction of the wall cavity 3 is communicated with a dispersion air supply pipeline 4 through a pipeline.
In practical application, the waste gas circulation hole 5 is 200mm higher than the bottom of the vertical flue, the size of the wall cavity 3 is about 75mm × 3000mm × 600mm (length × width × height), the bottom of the wall cavity 3 is about 1000mm away from the bottom of the vertical flue, the wall cavity 3 is horizontally connected with a plurality of rows of uniform air nozzles I2, the distance between the rows of air nozzles I2 and the bottom of the vertical flue is 1500mm at the lowest, the distance between the rows of air nozzles I2 and the top of the vertical flue is 500mm at the highest, the horizontal distance between the rows of air nozzles I2 is 50mm-250mm, the vertical distance is 100 mm-500 mm, the rows of air nozzles I2 form an included angle of 15-75 degrees with the horizontal direction, the diameter of the rows of air nozzles I2 is 10-40mm, the wall cavity 3 is downwards converged to the dispersion air supply pipeline 4, and the main nozzle is positioned at the bottom of.
The vertical flue structure can burn blast furnace gas, coke oven gas and high-coke mixed gas, during burning, gas and part of air are respectively sprayed out from a coke oven gas nozzle 7, a blast furnace gas nozzle 8 and an air nozzle II 9 at the bottom of the vertical flue, and are mixed with waste gas from a waste gas circulation hole 5 to be partially burned, meanwhile, the rest air is preheated and then sprayed out from a plurality of rows of uniform air nozzles I2 through a dispersion air supply pipeline 4 and a wall cavity 3, and is mixed and dispersed with the mixed gas of an ascending air flow to be burned, the heat of the waste gas generated by burning is transferred to the wall of the vertical flue, and the waste gas is transferred into a carbonization chamber and then enters a descending flue through a crossing hole 6, and is discharged from a gas nozzle at the other side of the double-flue, and after burning direction change, the working condition of the other vertical flue is the same and is not. In addition, the dispersion air supply pipeline 4 can also supply fuel gas for gas dispersion combustion.
The invention changes the sectional combustion of the vertical flue of the traditional coke oven into a dispersion combustion mode, greatly promotes the uniformity of the temperature field in the vertical flue, improves the heating performance of the vertical flue, reduces the highest temperature of combustion and reduces the generation content of nitrogen oxides in the vertical flue. In addition, the invention can adapt to the combustion of the vertical flame path under different working conditions by controlling the air flow of the main diffusion combustion orifice, and also embodies the adaptability of the structure.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (3)

1. A combustion device of a vertical flue of a coke oven is characterized in that: comprises a vertical flue partition wall (1), an air nozzle I (2), a wall cavity (3), a dispersion air supply pipeline (4), a waste gas circulation hole (5), a crossing hole (6), a coke oven gas nozzle (7), a blast furnace gas nozzle (8) and an air nozzle II (9), the device consists of at least two vertical flues, each two vertical flues form a duplex vertical flue, the upper parts of the duplex vertical flues are provided with a crossing hole (6), the bottoms of the duplex vertical flues are communicated through a waste gas circulation hole (5), the bottom of each vertical flue is respectively provided with a coke oven gas nozzle (7), a blast furnace gas nozzle (8) and an air nozzle II (9), vertical flue partition walls (1) are arranged between the vertical flues, a wall cavity (3) is arranged at each vertical flue partition wall (1), the wall cavity (3) is horizontally connected with a plurality of rows of uniform air nozzles I (2), and the lower end of the wall cavity (3) is communicated with a dispersed air supply pipeline (4) through a pipeline;
the number of the first air nozzles (2) in each row is not less than 2;
the aperture of the first air nozzle (2) is between 10mm and 40mm, the cross section of the first air nozzle (2) is circular, square, rectangular or elliptical, the first air nozzle (2) is gradually expanded along the jet flow direction, the horizontal distance between the first air nozzles (2) is between 50mm and 250mm, the vertical distance between the first air nozzles (2) is between 100 mm and 500mm, and the included angle between the first air nozzles (2) and the horizontal direction is between 15 degrees and 75 degrees;
the bottom of the wall cavity (3) is 1200mm away from the bottom of the vertical fire channel; the first air nozzle (2) is at the lowest 1500mm from the bottom of the vertical flue and at the highest 500mm from the top of the vertical flue.
2. The combustion method for combustion by using the combustion apparatus of the coke oven vertical flue of claim 1, characterized in that: during combustion, fuel gas and part of air are respectively sprayed out from the bottom of the vertical flame path and then are mixed and combusted, meanwhile, the rest air is preheated and then sequentially passes through the diffused air supply pipeline (4) and the wall cavity (3) and is sprayed out from the multiple rows of uniform air nozzles (2), the air is mixed with the mixed gas of the ascending air flow to realize air dispersion combustion, the heat is transferred into the carbonization chamber through the partition wall of the vertical flame path by waste gas generated by combustion, then enters the descending flame path through the crossing holes (6), and then is discharged from the air and fuel gas nozzles at the other side of the duplex vertical flame path; after reversing, the combustion process is reversed from that described above.
3. The combustion method of a combustion apparatus of a coke oven shaft according to claim 2, characterized in that: the dispersion air supply pipe (4) supplies air or gas.
CN201810496907.XA 2018-05-22 2018-05-22 Combustion device and combustion method for vertical flue of coke oven Active CN108753314B (en)

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CN111040785B (en) * 2019-12-31 2020-12-18 武汉科技大学 Combustion device and combustion method for realizing low NOX emission of vertical flue of coke oven
CN112538359A (en) * 2020-12-21 2021-03-23 中冶焦耐(大连)工程技术有限公司 Heating system of rich gas coke oven and combined adjusting method
CN114656979A (en) * 2022-03-23 2022-06-24 中冶焦耐(大连)工程技术有限公司 Heat recovery coke oven main wall structure

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JP3821995B2 (en) * 1999-06-10 2006-09-13 社団法人日本鉄鋼連盟 Coke oven combustion chamber and its operating method
DE102005025955B3 (en) * 2005-06-03 2007-03-15 Uhde Gmbh Supply of combustion air for coking ovens
CN105202543A (en) * 2015-10-20 2015-12-30 北京首钢国际工程技术有限公司 Multi-stream, high-temperature and low-oxygen and low NOx horizontally combined type single heat storage burner
CN107033926B (en) * 2017-06-20 2019-08-27 中冶焦耐(大连)工程技术有限公司 Realize the coke oven combustion chamber flue structure of low nitrogen oxide burning
CN107057721B (en) * 2017-06-20 2019-06-14 中冶焦耐(大连)工程技术有限公司 The method for realizing low nitrogen burning in coke oven combustion chamber flue

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