CN113025349A - Coke oven vertical flue structure with sectional heating and sectional exhaust gas circulation - Google Patents
Coke oven vertical flue structure with sectional heating and sectional exhaust gas circulation Download PDFInfo
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- CN113025349A CN113025349A CN202110255034.5A CN202110255034A CN113025349A CN 113025349 A CN113025349 A CN 113025349A CN 202110255034 A CN202110255034 A CN 202110255034A CN 113025349 A CN113025349 A CN 113025349A
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- coke oven
- vertical flue
- waste gas
- gas circulation
- exhaust gas
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- 239000000571 coke Substances 0.000 title claims abstract description 46
- 238000010438 heat treatment Methods 0.000 title claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 89
- 239000002912 waste gas Substances 0.000 claims abstract description 67
- 238000005192 partition Methods 0.000 claims abstract description 21
- 206010022000 influenza Diseases 0.000 claims abstract description 17
- 230000009977 dual effect Effects 0.000 claims description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 69
- 238000002485 combustion reaction Methods 0.000 abstract description 25
- 238000002156 mixing Methods 0.000 abstract description 4
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 239000000567 combustion gas Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000004939 coking Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- 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
- C10B29/00—Other details of coke ovens
-
- 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
-
- 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
- C10B21/18—Recirculating the flue gases
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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 relates to a coke oven vertical flue structure for heating and circulating waste gas in a segmented manner, wherein the coke oven vertical flue is a duplex vertical flue, the tops of 2 vertical flues forming the duplex vertical flue are communicated through a crossover hole, and the 2 vertical flues are communicated through a waste gas circulating hole; a plurality of sections of gas outlets are respectively arranged on the outer partition walls on the two sides of the double vertical flues and/or the middle partition wall between the 2 vertical flues along the height direction; and a plurality of sections of waste gas circulating holes are formed in the middle partition wall along the height direction, wherein the bottom waste gas circulating hole is formed at the lowest part. The invention increases the waste gas circulation amount by arranging the multiple sections of waste gas circulation holes, has simple structure and easy implementation, can increase the mixing degree of combustible gas, combustion-supporting gas and circulating waste gas, and weakens the combustion intensity, thereby effectively improving the uniformity of the high-direction heating of the coke oven and reducing the generation amount of nitrogen oxides.
Description
Technical Field
The invention relates to the technical field of coke ovens, in particular to a vertical flue structure of a coke oven for heating and circulating waste gas in a segmented manner.
Background
The development of the coke oven technology into a chamber type structure has been carried out for nearly a hundred years, the structures of a regenerator, a chute, a combustion chamber and a furnace top of a vertical coke oven tend to be stable, and the development of the coke oven technology needs great technical innovation.
In recent years, along with the trend of strict national environmental protection policies and the enhancement of public environmental protection awareness, the control of the discharge amount of nitrogen oxides, sulfides and the like in the flue gas of the coke oven coking process by each country is more and more strict, and the discharge amount of the nitrogen oxides in the production process of the coke oven does not exceed 500mg/m according to the latest national standard requirement3While the emission standards for a class of regions are more stringent. Therefore, coking design and production enterprises adopt various ways to reduce the discharge amount of nitrogen oxides, sulfides and the like in the flue gas.
At present, the control mode of nitrogen oxide emission mainly comprises two modes of source control and post-treatment, wherein the source control is to reduce the generation of nitrogen oxides in a coke oven by controlling combustion temperature, combustion intensity and the like according to the generation mechanism of the nitrogen oxides, and the post-treatment is to treat the generated waste gas near a chimney by adopting various desulfurization and denitrification modes.
As for the source control mode, the generation of nitrogen oxides is mainly controlled by adopting a mode of combining sectional heating and exhaust gas circulation. In the design of the coke oven with the early coking chamber height of less than 6m, the discharge of nitrogen oxides has no specific requirements, and the uniformity of the heating of the oven body in the height direction is improved mainly by adopting a waste gas circulation mode, because the waste gas circulation can introduce the waste gas in the downdraft vertical flue in the double vertical flues into the updraft vertical flue through the waste gas circulation holes, thereby diluting the concentration of combustion gas in the updraft vertical flue, playing a role of lengthening the flame height and further improving the uniformity of the heating of the coke oven in the height direction. With the development of large-scale coke ovens and the stricter requirements on the emission of nitrogen oxides, the requirements of uniform heating and source emission reduction of nitrogen oxides of large coke ovens cannot be met only by adopting a waste gas circulation mode. Therefore, the large-scale coke oven mainly adopts a mode of combining sectional heating and waste gas circulation to control the generation of nitrogen oxides at present, and the sectional heating mode divides a large torch in the rising vertical flue into two, three or more small torches, so that the intensity of combustion in the vertical flue can be obviously reduced, the generation of nitrogen oxides can be obviously reduced, and the uniformity of the coke oven in the vertical heating direction can be obviously improved.
The chinese utility model patent with publication number CN205223091U discloses "a reduce vertical flame path bottom structure that coke oven nitrogen oxide generated", chinese utility model patent with publication number CN205223094U discloses "an effectively reduce vertical flame path bottom structure that coke oven nitrogen oxide generated", through changing vertical flame path bottom combustible gas and combustion-supporting gas's passageway structure or entry structure, make combustible gas and combustion-supporting gas burn after vertical flame path bottom mixes with circulating waste gas earlier to weaken the intensity of combustion, reduce combustion temperature. Chinese utility model patent publication No. CN209778735U discloses a "coke oven combustion chamber exhaust gas circulation hole structure", through the section shape that changes the exhaust gas circulation hole, adjustment circulation exhaust gas circulation route to try to maximize exhaust gas circulation volume, and then strengthen the degree of mixing and weaken the combustion strength. The chinese utility model patent publication No. CN 205223090U discloses a "coke oven exhaust gas circulation structure" in which exhaust gas is returned to the oven through an external pipe, thereby increasing the amount of exhaust gas circulation. The disclosed technology has a certain effect on improving the high-direction heating uniformity of the vertical flame path and reducing the generation of nitrogen oxides, and the disclosed technology has certain beneficial effects in practical application through single use or combined use, but practice shows that the effects of the technology have certain bottlenecks, and the effect of reducing the emission of the nitrogen oxides is difficult to continue to be improved after a certain degree is reached.
Disclosure of Invention
The invention provides a vertical flue structure of a coke oven for heating and circulating waste gas in a segmented manner, which increases the circulation amount of the waste gas by arranging a plurality of segments of waste gas circulation holes, has simple structure and easy implementation, can increase the mixing degree of combustible gas, combustion-supporting gas and circulating waste gas, and weakens the combustion intensity, thereby effectively improving the uniformity of the high-direction heating of the coke oven and reducing the generation amount of nitrogen oxides.
In order to achieve the purpose, the invention adopts the following technical scheme:
a coke oven vertical flue structure for heating and circulating waste gas in a segmented manner, wherein the coke oven vertical flue is a dual vertical flue, the tops of 2 vertical flues forming the dual vertical flue are communicated and communicated through a spanning hole, and the 2 vertical flues are communicated through a waste gas circulating hole; a plurality of sections of gas outlets are respectively arranged on the outer partition walls on the two sides of the double vertical flues and/or the middle partition wall between the 2 vertical flues along the height direction; and a plurality of sections of waste gas circulating holes are formed in the middle partition wall along the height direction, wherein the bottom waste gas circulating hole is formed at the lowest part.
The gas outlet comprises a multi-section gas outlet and/or a multi-section air outlet.
The multi-section waste gas circulation holes and the multi-section gas outlets are arranged in a one-to-one correspondence mode or are respectively arranged.
The bottom waste gas circulation holes are symmetrically arranged at the bottom of the vertical flue partition, and the rest waste gas circulation holes of all the sections are symmetrically or asymmetrically arranged.
Except the bottom waste gas circulating hole, other sections of waste gas circulating holes are arranged above, below, on one side or on two sides of the corresponding gas outlet.
The waste gas circulating holes are rectangular holes, round holes, elliptical holes or polygonal holes except the rectangular holes.
Compared with the prior art, the invention has the beneficial effects that:
1) on the basis of sectional heating, the waste gas circulating holes are also arranged in sections, so that waste gas circulation can be realized for each section of combustion gas, the combustion gas is mixed with the circulating waste gas firstly and then combusted, the concentration of combustible gas and oxygen is reduced, the combustion strength is weakened, and the highest combustion temperature is reduced;
2) experimental verification results show that the flame length of each section of combustion gas is lengthened after multiple sections of waste gas circulation is adopted, so that combustion in the vertical flue is more uniform, and the uniformity of vertical flue high-direction heating is improved;
3) the generation amount of nitrogen oxides in the combustion process in the vertical flue is reduced, so that the emission of nitrogen oxides in the coke oven is reduced, and the pollution to the environment is reduced;
4) the sectional waste gas circulation hole can achieve the effect only by being arranged in the range of sectional gas injection force, and the sectional waste gas circulation hole is simple in structure, flexible in arrangement and easy to achieve.
Drawings
FIG. 1 is a schematic diagram of a vertical flue structure of a coke oven adopting sectional heating.
Fig. 2 is a view a-a in fig. 1.
FIG. 3 is a first structural diagram of a vertical flue of a coke oven with sectional heating and exhaust gas circulation.
Fig. 4 is a view B-B in fig. 3.
FIG. 5 is a schematic diagram of a vertical flue structure of a coke oven with sectional heating and exhaust gas circulation.
Fig. 6 is a view C-C in fig. 5.
In the figure: 1. outer partition wall 2, middle partition wall 3, chute outlet 4, bottom exhaust gas circulation hole 5, two-section gas outlet 6, three-section gas outlet 7, crossing hole 8, two-section exhaust gas circulation hole 9, three-section exhaust gas circulation hole
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
as shown in figures 3 and 4, the coke oven vertical flue structure with the sectional heating and the sectional exhaust gas circulation is characterized in that the coke oven vertical flue is a double vertical flue, and the tops of 2 vertical flues forming the double vertical flue are communicated through a crossing hole 7; a plurality of sections of gas outlets are respectively arranged on the outer partition walls 1 at two sides of the duplex vertical flues and/or the middle partition wall 2 between the 2 vertical flues along the height direction; a plurality of sections of waste gas circulation holes are arranged on the middle partition wall 2 along the height direction, wherein the bottom waste gas circulation hole 4 is arranged at the lowest part.
The multi-section gas outlet comprises a multi-section gas outlet and/or a multi-section air outlet.
The multi-section waste gas circulation holes and the multi-section gas outlets are arranged in a one-to-one correspondence mode.
The bottom waste gas circulation holes 4 are symmetrically arranged at the bottom of the vertical flue, and the rest waste gas circulation holes of all the sections are symmetrically or asymmetrically arranged.
Except the bottom waste gas circulating hole 4, the rest waste gas circulating holes of all the sections are arranged above, below, on one side or on two sides of the gas outlet of the corresponding section.
Each section of waste gas circulation hole is a rectangular hole, a round hole, an elliptical hole or a polygonal hole except the rectangular hole.
The vertical flue structure of the sectional combustion coke oven combustion chamber adopts a double-linkage vertical flue structure, is built or poured by refractory materials, and has two sides provided with 2 adjacent groups of outer partition walls 1 spaced between the double-linkage vertical flues and a middle part provided with a middle partition wall 2 spaced between the 2 vertical flues forming the double-linkage vertical flue; the bottom of the combustion chamber is provided with a chute outlet 3 and a bottom waste gas circulating hole 4; the outer partition wall 1 and the middle partition wall 2 are respectively provided with a plurality of sections of gas outlets, and the top of the double-linkage vertical flue is provided with a crossing hole 7.
The typical sectional heating vertical flue structure is shown in fig. 1 and 2, the outer partition wall 1 and the middle partition wall 2 are respectively provided with three sectional combustion points at the bottom, the middle and the upper part, and the waste gas circulation hole is positioned at the bottom of the vertical flue. The combustion gas is sprayed out from the chute outlet 3, the two-section gas outlet 5 and the three-section gas outlet 6 at the bottom of the combustion chamber, and only 2 bottom waste gas circulating holes 4 are arranged in a double-linked flame path.
The waste gas circulation holes are arranged in sections on the basis of the existing section heating vertical flue, and the waste gas circulation is realized by each section of the waste gas circulation holes under the action of the injection force generated by the injection of the gas at the corresponding section, so that the mixing degree of combustible gas, combustion-supporting gas and circulating waste gas at each section is increased, the uniformity of the coke oven in the high-direction heating is effectively improved, and the generation amount of nitrogen oxides is reduced.
The vertical flue structure for heating in sections and circulating exhaust gas in sections is suitable for a top-loading coke oven and a tamping coke oven, and is also suitable for other heating furnaces with the same structure.
The invention relates to a vertical flue structure for heating and circulating waste gas in sections, which comprises a structural form that gas and air are simultaneously sectioned, and also comprises a structural form that only air is sectioned or only gas is sectioned.
According to the vertical flue structure for the sectional heating and sectional waste gas circulation, the sectional number of the gas outlets is more than or equal to 2, but the upper limit of the sectional number is not limited.
According to the vertical flue structure for the sectional heating and sectional exhaust gas circulation, the number of the sections of the exhaust gas circulation holes is more than or equal to 2, but the upper limit of the number of the sections is not limited, and the sectional exhaust gas circulation holes and the sectional gas outlets can be in one-to-one correspondence or not.
The arrangement positions of the sectional waste gas circulating holes can be located above, below, on the left side and on the right side of the corresponding gas outlets, and the arrangement positions can be within the action range of the jetting force of the sectional gas jetting.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
In the present embodiment, as shown in fig. 3 and 4, the gas ejected from each gas outlet includes gas and air (combustion-supporting gas), and the gas enters the dual-stage flame path in three stages, i.e. ejected from the chute outlet 3 at the bottom of the combustion chamber, the two-stage gas outlet 5 and the three-stage gas outlet 6.
In the embodiment, the waste gas circulating holes are provided with three sections, the bottom waste gas circulating holes 4 are correspondingly arranged on two sides of the chute outlet 3, and the two sections of waste gas circulating holes 8 are correspondingly arranged on two sides of the two sections of gas outlets 5 and are positioned in the range of the injection force of the two sections of gas; the three-section waste gas circulation holes 9 are correspondingly arranged on two sides of the three-section gas outlet 6 and are positioned in the range of the three-section gas injection force.
Each section of gas is fully mixed with the circulating waste gas of the corresponding section before combustion, so that the combustion intensity is obviously weakened, the uniformity of the coke oven in the high-direction heating is effectively improved, and the generation amount of nitrogen oxides is reduced.
[ example 2 ]
In the present embodiment, as shown in fig. 5 and 6, the air enters the double-parallel fire channel in three sections, i.e. the air is injected from the chute outlet 3 at the bottom of the combustion chamber, the two-section gas outlet 5 and the three-section gas outlet 6. The gas is not staged but fed from gas pipe bricks.
In the embodiment, the waste gas circulating holes are provided with three sections, the bottom waste gas circulating holes 4 are correspondingly arranged at two sides of the chute outlet 3, and the two sections of waste gas circulating holes 8 are correspondingly arranged at one side of the two sections of gas outlets 5 and are positioned in the range of the two sections of air injection force; the three-section waste gas circulation hole 9 is correspondingly arranged on the other side of the three-section gas outlet 6 and is positioned in the range of three-section air injection force.
Each section of gas is fully mixed with the circulating waste gas of the corresponding section before combustion, so that the combustion intensity is obviously weakened, the uniformity of the coke oven in the high-direction heating is effectively improved, and the generation amount of nitrogen oxides is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent substitutions or changes according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (6)
1. A coke oven vertical flue structure for heating and circulating waste gas in a segmented manner, wherein the coke oven vertical flue is a dual vertical flue, and the tops of 2 vertical flues forming the dual vertical flue are communicated through a crossing hole; a plurality of sections of gas outlets are respectively arranged on the outer partition walls on the two sides of the double vertical flues and/or the middle partition wall between the 2 vertical flues along the height direction; the device is characterized in that a plurality of sections of waste gas circulating holes are arranged on the middle partition wall along the height direction, wherein the bottom waste gas circulating hole is arranged at the lowest part.
2. The coke oven vertical flue structure with segmental heating and segmental exhaust gas circulation of claim 1, wherein the multiple segments of gas outlets comprise multiple segments of gas outlets and/or multiple segments of air outlets.
3. The coke oven vertical flue structure with the sectional heating and the sectional exhaust gas circulation of claim 1, wherein the multiple sections of exhaust gas circulation holes are arranged in one-to-one correspondence with the multiple sections of gas outlets.
4. The coke oven vertical flue structure with sectional heating and sectional exhaust gas circulation of claim 1, wherein the bottom exhaust gas circulation holes are symmetrically arranged at the bottom of the vertical flue, and the rest sections of the exhaust gas circulation holes are symmetrically or asymmetrically arranged.
5. The coke oven vertical flue structure with the sectional heating and the sectional exhaust gas circulation of claim 1, 3 or 4, wherein the exhaust gas circulation holes of the other sections except the bottom exhaust gas circulation hole are arranged above, below, on one side or on two sides of the gas outlet of the corresponding section.
6. The coke oven vertical flue structure with sectional heating and sectional exhaust gas circulation of claim 5, wherein each section of exhaust gas circulation hole is a rectangular hole, a circular hole, an elliptical hole or a polygonal hole except the rectangular hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110255034.5A CN113025349A (en) | 2021-03-09 | 2021-03-09 | Coke oven vertical flue structure with sectional heating and sectional exhaust gas circulation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110255034.5A CN113025349A (en) | 2021-03-09 | 2021-03-09 | Coke oven vertical flue structure with sectional heating and sectional exhaust gas circulation |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019053103A1 (en) * | 2017-09-15 | 2019-03-21 | Thyssenkrupp Industrial Solutions Ag | Coke oven device with circumflowed circular current path for producing coke and method for operating the coke oven device and control system and use |
| WO2020225013A1 (en) * | 2019-05-08 | 2020-11-12 | Thyssenkrupp Industrial Solutions Ag | Coke oven device for producing coke, method for operating the coke oven device, and use |
| CN214781637U (en) * | 2021-03-09 | 2021-11-19 | 中冶焦耐(大连)工程技术有限公司 | Coke oven vertical flue structure with sectional heating and sectional exhaust gas circulation |
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2021
- 2021-03-09 CN CN202110255034.5A patent/CN113025349A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019053103A1 (en) * | 2017-09-15 | 2019-03-21 | Thyssenkrupp Industrial Solutions Ag | Coke oven device with circumflowed circular current path for producing coke and method for operating the coke oven device and control system and use |
| CN111436202A (en) * | 2017-09-15 | 2020-07-21 | 蒂森克虏伯工业解决方案股份公司 | Coke oven plant for producing coke, having a circulating flow path that is circulated, and method for operating the coke oven plant, as well as control device and use |
| CN111479902A (en) * | 2017-09-15 | 2020-07-31 | 蒂森克虏伯工业解决方案股份公司 | Coke oven plant with central recirculation for producing coke, method for operating a coke oven plant, and control device and use |
| CN111492038A (en) * | 2017-09-15 | 2020-08-04 | 蒂森克虏伯工业解决方案股份公司 | Coke oven plant with eccentric inlet for producing coke, method for operating coke oven plant, control device and use |
| WO2020225013A1 (en) * | 2019-05-08 | 2020-11-12 | Thyssenkrupp Industrial Solutions Ag | Coke oven device for producing coke, method for operating the coke oven device, and use |
| CN214781637U (en) * | 2021-03-09 | 2021-11-19 | 中冶焦耐(大连)工程技术有限公司 | Coke oven vertical flue structure with sectional heating and sectional exhaust gas circulation |
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