CN108728126B - High-directional heating uniformity at any time adjustable coke oven heating system and adjusting method - Google Patents
High-directional heating uniformity at any time adjustable coke oven heating system and adjusting method Download PDFInfo
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- CN108728126B CN108728126B CN201810856287.6A CN201810856287A CN108728126B CN 108728126 B CN108728126 B CN 108728126B CN 201810856287 A CN201810856287 A CN 201810856287A CN 108728126 B CN108728126 B CN 108728126B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 60
- 239000000571 coke Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 107
- 238000002485 combustion reaction Methods 0.000 claims abstract description 71
- 230000001105 regulatory effect Effects 0.000 claims abstract description 63
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 39
- 230000008569 process Effects 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000007363 regulatory process Effects 0.000 abstract 1
- 239000011449 brick Substances 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 16
- 239000000567 combustion gas Substances 0.000 description 8
- 238000003763 carbonization Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000004939 coking Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
-
- 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
- C10B21/04—Heating of coke ovens with combustible gases with rich gas
-
- 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
- C10B21/08—Heating of coke ovens with combustible gases by applying special heating gases
Abstract
The invention relates to a coke oven heating system with high directional heating uniformity adjustable at any time and an adjusting method, wherein the coke oven heating system comprises a small flue, a heat exchange channel, a combustion-supporting gas channel and a combustion chamber, wherein the heat exchange channel consists of a bottom gas supply heat exchange channel, a middle gas supply heat exchange channel and an upper gas supply heat exchange channel; the combustion-supporting gas channel consists of a bottom combustion-supporting gas channel, a middle section combustion-supporting gas channel and an upper section combustion-supporting gas channel; and the small flue connecting pipe is respectively provided with a flame path bottom air supply hole, a bottom air inlet flow regulating device, a vertical flame path middle section air supply hole, a middle section air inlet flow regulating device, a vertical flame path upper section air supply hole and an upper section air inlet flow regulating device. In the coke oven heating system, the combustion and heating amounts at the bottom, middle and upper positions of the vertical flame path can be respectively and independently controlled and regulated, and the regulating process is simple, accurate and convenient; the high-directional heating uniformity of the coke oven is effectively ensured; and simultaneously is beneficial to reducing the emission of nitrogen oxides of the coke oven.
Description
Technical Field
The invention relates to the technical field of combustible gas downward-spraying coke ovens, in particular to a high-directional heating uniformity at any time adjustable gas-rich heating coke oven heating system and an adjusting method thereof.
Background
Along with the transition of modern production modes, a focusing furnace has higher requirements, such as uniform heating, high production capacity, small resistance of a heating system, convenient adjustment and control and the like. At present, the existing downward-spraying coke oven in China adopts the modes of high and low lamp caps, waste gas circulation, sectional supply of combustion-supporting gas and the like in order to control the combustion temperature in the vertical flame path and improve the high-directional heating uniformity in the vertical flame path. In the coke oven heating system adopting the measures, as shown in fig. 1-3, combustion-supporting gas enters the chute 2 from the regenerator 1, is separated at the chute 2, one part of the combustion-supporting gas directly enters the bottom of the vertical flame path through the bottom combustion-supporting gas outlet 7, and the other part of the combustion-supporting gas enters the vertical flame path 3 from the sectional combustion-supporting gas outlet 5 through the combustion-supporting gas channel 4 in the partition wall of the vertical flame path. In the coke oven with the structural form, combustion air is split from one regenerator through the chute and respectively enters the bottom of the vertical flame path and the middle upper part of the vertical flame path, and the distribution of the chute mouth adjusting bricks 9 and the sectional outlet adjusting bricks 8 can be adjusted, so that the distribution proportion of the combustion air entering the bottom of the vertical flame path and the middle upper part of the vertical flame path can be adjusted, and the heating quantity of the bottom of the vertical flame path and the middle upper part of the vertical flame path can be adjusted.
In the design stage of the coke oven body, the distribution of the regulating bricks can be determined only through theoretical calculation, and the distribution proportion of the air flow of the two parts cannot be quantitatively determined in actual production, so that the error is larger; after the coke oven is put into production, particularly after long-time operation, the adjusting bricks are adhered to the partition bricks, the high temperature in the vertical flame path causes the adjusting device of the adjusting bricks to fail, and the two reasons cause the adjustment of the adjusting bricks to be unable to be realized, namely, the secondary adjustment is difficult to be carried out, and the expected flame path temperature distribution is difficult to be realized. Particularly, when the production state of the coke oven is changed, the heating quantity at the bottom and the middle and upper parts of the vertical flame path cannot be adjusted, so that the high-directional heating uniformity of the coke oven is deteriorated, and the coking heat consumption is increased.
In addition, the chute 2 in the conventional coke oven body adopts a Y-shaped bifurcation structure, the structure is complex, the design difficulty is increased, the design of bricks is complex to ensure tightness, the brick making difficulty is increased, the protection and cleaning difficulties in the masonry process are increased, the masonry difficulty is increased, and the system resistance is increased due to the complex circulation structure, so that the combustion air circulation is not facilitated.
Meanwhile, when the coke oven which is put into production at home at present and is more than 6 meters is heated by using rich gas, the discharge water of nitrogen oxides is higher than 500mg/m on average 3 The method can not meet the industry emission standard, because the design of the reheating type coke oven is to take account of both lean gas and rich gas heating, when the coke oven adopts rich gas heating, the excessive air coefficient at the bottom of the vertical flame path is close to 1, the combustion is severe, the combustion temperature is high, a large amount of nitrogen oxides are generated in the high temperature area, the air inflow of combustion air at the bottom of the vertical flame path can not be effectively regulated due to the limitation of the oven body structure, the combustion temperature can not be reduced, the generation of nitrogen oxides can not be inhibited, and in order to ensure that the discharge of the coke oven reaches the standard, the denitration procedure can only be added after the oven, so that the construction cost and the production cost are greatly improved.
Disclosure of Invention
The invention provides a coke oven heating system with high directional heating uniformity which can be adjusted at any time and an adjusting method, wherein the combustion and heating amounts at the bottom, the middle and the upper parts of a vertical flame path can be respectively and independently controlled and adjusted, and the adjusting process is simple, accurate and convenient; the high-directional heating uniformity of the coke oven is effectively ensured; and simultaneously is beneficial to reducing the emission of nitrogen oxides of the coke oven.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the coke oven heating system with the high-directional heating uniformity adjustable at any time comprises a small flue, a heat exchange channel, a combustion-supporting gas channel and a combustion chamber which are sequentially connected from bottom to top, wherein the heat exchange channel consists of a bottom gas supply heat exchange channel, a middle gas supply heat exchange channel and an upper gas supply heat exchange channel; the combustion-supporting gas channel consists of a bottom combustion-supporting gas channel, a middle section combustion-supporting gas channel and an upper section combustion-supporting gas channel; a small flue connecting pipe connected with a small flue corresponding to the bottom air supply heat exchange channel is provided with a flame path bottom air supply hole, the bottom air supply hole of the vertical flame path bottom is provided with a bottom air inlet flow regulating device, and the bottom air supply heat exchange channel is communicated with a bottom combustion-supporting gas outlet through a bottom combustion-supporting gas channel; a small flue connecting pipe connected with a small flue corresponding to the middle section air supply heat exchange channel is provided with a flame path middle section air supply hole, a middle section air inlet flow regulating device is arranged at the position of the vertical flame path middle section air supply hole, the middle section air supply heat exchange channel is communicated with a middle section combustion-supporting gas channel, and the middle section combustion-supporting gas channel is provided with at least one middle section combustion-supporting gas outlet at the middle lower part of the vertical flame path in the high direction; an upper section air supply hole of the flame path is formed in a small flue connecting pipe connected with a small flue corresponding to the upper section air supply heat exchange channel, an upper section air inlet flow regulating device is arranged at the upper section air supply hole of the vertical flame path, the upper section air supply heat exchange channel is communicated with an upper section combustion-supporting gas channel, and at least one upper section combustion-supporting gas outlet is arranged at the upper middle position of the vertical flame path in the height direction.
The middle section combustion-supporting gas channel and the upper section combustion-supporting gas channel are respectively arranged in the vertical flame path partition wall.
The method for adjusting the coke oven heating system with the high-directional heating uniformity adjustable at any time comprises the following steps:
a jet of combustion air enters the bottom air supply heat exchange channel from the bottom air supply hole of the vertical flame path on the small flue connecting pipe and directly enters the vertical flame path through the bottom combustion air outlet; the second stream of combustion air enters the middle section air supply and heat exchange channel from the middle section air supply hole of the vertical flame channel on the small flue connecting pipe, and enters the vertical flame channel from the middle section combustion air outlet through the middle section combustion air channel; the third stream of combustion air enters the upper section air supply and heat exchange channel from the upper section air supply hole of the vertical flame path on the small flue connecting pipe, and enters the vertical flame path from the upper section combustion air outlet through the upper section combustion air channel; the air quantity of combustion-supporting air entering the vertical flame path from the bottom combustion-supporting air outlet is independently regulated by a bottom air inlet flow regulating device arranged at a bottom air supply hole of the vertical flame path, the air quantity of combustion-supporting air entering the vertical flame path from the middle section combustion-supporting air outlet is independently regulated by a middle section air inlet flow regulating device arranged at a middle section air supply hole of the vertical flame path, and the air quantity of combustion-supporting air entering the vertical flame path from the upper section combustion-supporting air outlet is independently regulated by an upper section air inlet flow regulating device arranged at an upper section air supply hole of the vertical flame path; the above adjusting process can be carried out outside the furnace at any time.
The bottom air inflow of combustion air at the bottom of the vertical flame path is adjusted through the bottom air inflow adjusting device, so that the heating amount at the bottom of the vertical flame path is independently adjusted; the air inflow of combustion air entering the vertical flame path from the middle-section combustion-supporting gas outlet is regulated by the middle-section air inflow regulating device, so that the heating quantity of the middle-lower part of the vertical flame path is independently regulated; the air inflow of combustion air entering the vertical flame path from the upper combustion air outlet is regulated by the upper inlet air flow regulating device, so that the heating amount of the upper part of the vertical flame path is independently regulated; the 3 air inlet flow adjusting devices are matched for adjustment, so that the coke oven can be heated in a high-directional and uniform mode, and the generation of nitrogen oxides in the vertical flame path is restrained.
Compared with the prior art, the invention has the beneficial effects that:
1) The amount of three combustion-supporting air entering the bottom, the middle lower part and the middle upper part of the vertical flame path can be independently and quantitatively controlled and regulated, namely, the heating amounts of the bottom, the middle lower part and the middle upper part of the vertical flame path can be independently controlled and regulated, so that an independently controllable multi-stage heating mode is formed, the control of the high-directional temperature of the vertical flame path is realized, and the high-directional heating uniformity of the coke oven is effectively ensured;
2) After the coke oven is put into production, along with the changes of production states such as coking time, gas components, coal blending components and the like, the amounts of three combustion supporting air entering the bottom, middle and upper positions of the vertical flame path can be independently and quantitatively controlled and regulated at any time, the heat supply distribution is ensured to meet the production requirement, the energy consumption is reduced, and the smooth production is ensured;
3) The conventional adjusting mode of the adjusting bricks in the furnace is changed into the adjusting mode of the air supply holes outside the furnace, the adjusting of the air inflow of the combustion air is realized through the corresponding air inflow flow adjusting device, the adjusting process can be completed in a flue corridor of the coke oven, the adjusting mode is simple and convenient, the operation of workers in severe environments is avoided, the labor is saved, and the labor intensity is reduced;
4) According to the gas emission monitoring result, the combustion air quantity at the bottom of the vertical flame path can be adjusted at any time, the excessive air coefficient at the bottom of the vertical flame path is reduced, the generation of nitrogen oxides in a high temperature area is reduced, the emission of nitrogen oxides in a coke oven is further reduced, the standard emission can be realized without a subsequent denitration process, and the construction cost and the production cost are saved;
5) The adjusting bricks arranged in the traditional coke oven are eliminated, and brick shapes are reduced;
6) Each combustion-supporting gas channel is of a straight-through structure without bifurcation, and has the advantages of simple structure, simple brick shape, convenient design, brick making and masonry, contribution to guaranteeing the air tightness of the furnace body structure, small system resistance and contribution to combustion-supporting air circulation.
Drawings
Fig. 1 is a schematic structural view of a conventional coke oven heating system.
Fig. 2 is a sectional view A-A in fig. 1.
Fig. 3 is a B-B cross-sectional view in fig. 1.
Fig. 4 is a front view of a coke oven heating system with high directional heating uniformity and adjustable time according to the present invention.
Fig. 5 is a C-C cross-sectional view of fig. 4.
Fig. 6 is a D-D sectional view of fig. 4.
Fig. 7 is a sectional view of E-E in fig. 4.
Fig. 8 is a cross-sectional view of F-F in fig. 4.
In the figure: 1. the regenerator 2, chute 3, vertical flue 4, combustion gas passage 5 in the vertical flue partition wall, staged combustion gas outlet 6, pipe brick 7, bottom combustion gas outlet 8, staged outlet adjustment brick 9, chute port adjustment brick 10, bottom gas heat exchange passage 11, mid-section gas heat exchange passage 12, upper section gas heat exchange passage 13, vertical flue mid-section combustion gas outlet 14, vertical flue upper section combustion gas outlet 15, mid-section combustion gas passage 16, upper section combustion gas passage 17, bottom combustion gas passage 18, vertical flue bottom gas supply hole 19, vertical flue mid-section gas supply hole 20, vertical flue upper section gas supply hole 21, small flue 22, exhaust gas recirculation hole 23 spanning hole 24, bottom gas inlet flow regulator 25, mid-section gas inlet flow regulator 26, upper section gas inlet flow regulator 27, small flue connecting pipe
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in fig. 4-8, the coke oven heating system with the high heating uniformity adjustable at any time comprises a small flue 21, a heat exchange channel, a combustion-supporting gas channel and a combustion chamber which are sequentially connected from bottom to top, wherein the heat exchange channel consists of a bottom gas supply heat exchange channel 10, a middle gas supply heat exchange channel 11 and an upper gas supply heat exchange channel 12; the combustion-supporting gas channel consists of a bottom combustion-supporting gas channel 17, a middle section combustion-supporting gas channel 15 and an upper section combustion-supporting gas channel 16; a small flue connecting pipe 27 connected with a small flue 21 corresponding to the bottom air supply heat exchange channel 10 is provided with a flame path bottom air supply hole 18, the vertical flame path bottom air supply hole 18 is provided with a bottom air inlet flow regulating device 24, and the bottom air supply heat exchange channel 10 is communicated with the bottom combustion-supporting gas outlet 7 through a bottom combustion-supporting gas channel 17; a small flue connecting pipe 27 connected with a small flue 21 corresponding to the middle section air supply heat exchange channel 11 is provided with a flame path middle section air supply hole 19, a middle section air inlet flow regulating device 25 is arranged at the position of the vertical flame path middle section air supply hole 19, the middle section air supply heat exchange channel 11 is communicated with the middle section combustion-supporting gas channel 15, and the middle section combustion-supporting gas channel 15 is provided with at least one vertical flame path middle section combustion-supporting gas outlet 13 at the middle lower part in the height direction of the vertical flame path 3; the small flue connecting pipe 27 connected with the small flue 21 corresponding to the upper section air supply heat exchange channel 12 is provided with a flame path upper section air supply hole 20, the position of the flame path upper section air supply hole 20 is provided with an upper section air inlet flow regulating device 26, the upper section air supply heat exchange channel 12 is communicated with the upper section combustion-supporting gas channel 16, and the upper section combustion-supporting gas channel 16 is provided with at least one flame path upper section combustion-supporting gas outlet 14 at the upper middle-upper part of the flame path 3 in the height direction.
The middle section combustion-supporting gas channel 15 and the upper section combustion-supporting gas channel 16 are respectively arranged in the vertical flame path partition wall.
The method for adjusting the coke oven heating system with the high-directional heating uniformity adjustable at any time comprises the following steps:
a jet of combustion air enters the bottom air supply and heat exchange channel 10 from the bottom air supply hole 18 of the vertical flame path on the small flue connecting pipe 27 and directly enters the vertical flame path 3 through the bottom combustion air outlet 7; the second stream of combustion air enters the middle section air supply and heat exchange channel 11 from the middle section air supply hole 19 of the vertical flame path on the small flue connecting pipe 27, and enters the vertical flame path 3 from the middle section combustion air outlet 13 of the vertical flame path through the middle section combustion air channel 15; the third stream of combustion air enters the upper section air supply and heat exchange channel 12 from the upper section air supply hole 20 of the vertical flame path on the small flue connecting pipe 27, and enters the vertical flame path 3 from the upper section combustion air outlet 14 of the vertical flame path through the upper section combustion air channel 16; wherein, the combustion air quantity entering the vertical flame path 3 from the bottom combustion-supporting gas outlet 7 is independently regulated by a bottom air inlet flow regulating device 24 arranged at a bottom air supply hole 18 of the vertical flame path, the combustion air quantity entering the vertical flame path 3 from a middle section combustion-supporting gas outlet 13 of the vertical flame path is independently regulated by a middle section air inlet flow regulating device 25 arranged at a middle section air supply hole 19 of the vertical flame path, and the combustion air quantity entering the vertical flame path 3 from an upper section combustion-supporting gas outlet 14 of the vertical flame path is independently regulated by an upper section air inlet flow regulating device 26 arranged at an upper section air supply hole 20 of the vertical flame path; the above adjusting process can be carried out outside the furnace at any time.
The bottom air inflow of combustion air at the bottom of the vertical flame path 3 is adjusted through the bottom air inflow adjusting device 24, so that the heating quantity at the bottom of the vertical flame path 3 is independently adjusted; the air inflow of combustion air entering the vertical flame path 3 from the combustion-supporting gas outlet 13 at the middle section of the vertical flame path is regulated by the middle section air inflow regulating device 25, so that the heating amount at the middle lower part of the vertical flame path 3 is independently regulated; the air inflow of combustion air entering the vertical flame path 3 from the combustion air outlet 14 at the upper section of the vertical flame path is regulated by the upper section air inflow regulating device 26, so that the heating amount at the upper part of the vertical flame path 3 is independently regulated; the 3 air inlet flow adjusting devices 24, 25 and 26 are matched for adjustment, so that the coke oven is heated in a high-directional and uniform mode, and the generation of nitrogen oxides in the vertical flame path is restrained.
In the downward-spraying coke oven provided with the heating system, a part of combustion-supporting gas enters the bottom gas supply heat exchange channel 10 from the bottom gas supply hole 18 of the vertical flame path through the small flue 21, enters the vertical flame path 3 from the bottom combustion-supporting gas outlet 7 through the bottom combustion-supporting gas channel 17, and meets with rich gas sprayed from the pipe bricks 6 to perform oxygen-deficient combustion; the second part of combustion-supporting gas enters the middle section gas supply heat exchange channel 11 from the middle section gas supply hole 19 of the vertical flame path through the small flue 21, enters the middle lower part of the vertical flame path 3 from the middle section combustion-supporting gas channel 15 through the middle section combustion-supporting gas outlet 13 of the vertical flame path, and is combusted by meeting with the residual rich gas after bottom combustion; the third part of combustion air enters the upper section air supply heat exchange channel 12 from the upper section air supply hole 20 of the vertical flame path through the small flue 21, enters the middle upper part of the vertical flame path 3 from the upper section combustion air channel 16 through the upper section combustion air outlet 14 of the vertical flame path, meets and burns with the residual rich gas after middle lower part of the combustion, further ensures the complete combustion of the gas, and the combusted waste gas enters the adjacent flame path through the crossing hole 23 to form descending air flow, part of descending air flow enters the ascending flame path through the waste gas circulation hole 22 at the bottom of the vertical flame path 3 to be mixed and burned with the ascending air flow, the combustion temperature is further reduced, and the residual descending air flow enters the small flue 21 after the heat exchange of the adjacent heat exchange channel is completed.
The bottom air inlet flow regulating device 24 is arranged at the bottom air supply hole 18 of the vertical flame path, so that the air inlet amount of combustion air at the bottom of the vertical flame path 3 can be regulated at any time, and the heating amount at the bottom of the vertical flame path 3 can be independently regulated; the middle section air inlet flow regulating device 25 is also arranged at the middle section air supply hole 19 of the vertical flame path, so that the air inlet amount of combustion air at the middle lower part of the vertical flame path 3 can be regulated at any time, and the heating amount at the middle lower part of the vertical flame path 3 can be independently regulated; the upper section air supply hole 20 of the vertical flame path is also provided with an upper section air inlet flow regulating device 26, so that the air inlet amount of combustion air at the middle upper part of the vertical flame path 3 can be regulated at any time, and the heating amount at the middle upper part of the vertical flame path 3 can be independently regulated.
In the production process, when the upper temperature of the coke cake is higher and the lower temperature is lower, coke pushing is difficult or the temperature of the top space is too high when coking occurs at the lower part of the carbonization chamber, the air inflow of the bottom air supply hole 18 of the vertical flame path is properly increased by respectively adjusting the bottom air inflow adjusting device 24, the middle air inflow adjusting device 25 and the upper air inflow adjusting device 26, the air inflow of the middle air supply hole 19 of the vertical flame path and the upper air supply hole 20 of the vertical flame path is reduced, so that the excessive air coefficient of the bottom of the vertical flame path 3 is increased, more rich gas is combusted at the bottom of the vertical flame path 3, namely the heat supply quantity of the bottom of the vertical flame path 3 is increased, the heat supply quantity of the lower part and the middle upper part of the vertical flame path 3 is reduced, the heat transfer quantity of the combustion chamber to the lower part of the carbonization chamber is further improved, and the maturation of the coke cake of the carbonization chamber is accelerated.
In the production process, when the lower temperature of the coke cake is higher and the upper temperature is lower, coke is generated at the upper part of the carbonization chamber and coke pushing is difficult, the air inflow of the bottom air supply hole 18 of the vertical flame path is properly reduced by respectively adjusting the bottom air inflow adjusting device 24, the middle air inflow adjusting device 25 and the upper air inflow adjusting device 26, the air inflow of the middle air hole 19 of the vertical flame path and the upper air supply hole 20 of the vertical flame path is increased, so that the excessive air coefficient of the bottom of the vertical flame path 3 is reduced, the combustion of rich gas at the bottom of the vertical flame path 3 is reduced, more rich gas is combusted at the middle part and the upper part of the vertical flame path 3, namely the heat supply quantity of the bottom of the vertical flame path 3 is reduced, the heat supply quantity of the middle part and the upper part of the vertical flame path 3 is increased, the heat transfer quantity of the combustion chamber to the upper part of the carbonization chamber is further improved, and the coke cake at the upper part of the carbonization chamber is accelerated.
Analysis showed that at air excess ratios less than 0.8, nox formation during combustion was significantly reduced. Therefore, when the content of nitrogen oxides in the exhaust gas of the coke oven chimney is too high in production, the air inflow of the bottom air supply hole 18 of the vertical flame path is properly reduced through the bottom air inflow adjusting device 24, and the excessive air coefficient is controlled to be below 0.8 when the bottom of the vertical flame path 3 is burnt, so that the emission of the nitrogen oxides in the production process can be effectively reduced. Simulation and calculation results show that the 7-meter coke oven adopting the heating system structure can realize standard emission of nitrogen oxides in the flue gas of the coke oven without subsequent denitration process treatment.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (1)
1. The method for adjusting the coke oven heating system with the high directional heating uniformity capable of being adjusted at any time is characterized in that the coke oven heating system with the high directional heating uniformity capable of being adjusted at any time comprises a small flue, a heat exchange channel, a combustion-supporting gas channel and a combustion chamber which are sequentially connected from bottom to top, wherein the heat exchange channel consists of a bottom air supply heat exchange channel, a middle air supply heat exchange channel and an upper air supply heat exchange channel; the combustion-supporting gas channel consists of a bottom combustion-supporting gas channel, a middle section combustion-supporting gas channel and an upper section combustion-supporting gas channel; a small flue connecting pipe connected with a small flue corresponding to the bottom air supply heat exchange channel is provided with a flame path bottom air supply hole, the bottom air supply hole of the vertical flame path bottom is provided with a bottom air inlet flow regulating device, and the bottom air supply heat exchange channel is communicated with a bottom combustion-supporting gas outlet through a bottom combustion-supporting gas channel; a small flue connecting pipe connected with a small flue corresponding to the middle section air supply heat exchange channel is provided with a flame path middle section air supply hole, a middle section air inlet flow regulating device is arranged at the position of the vertical flame path middle section air supply hole, the middle section air supply heat exchange channel is communicated with a middle section combustion-supporting gas channel, and the middle section combustion-supporting gas channel is provided with at least one middle section combustion-supporting gas outlet at the middle lower part of the vertical flame path in the high direction; an upper section air supply hole of the flame path is formed in a small flue connecting pipe connected with a small flue corresponding to the upper section air supply heat exchange channel, an upper section air inlet flow regulating device is arranged at the upper section air supply hole of the vertical flame path, the upper section air supply heat exchange channel is communicated with an upper section combustion-supporting gas channel, and at least one upper section combustion-supporting gas outlet is formed in the upper middle part of the vertical flame path in the height direction; the middle section combustion-supporting gas channel and the upper section combustion-supporting gas channel are respectively arranged in the vertical flame path partition wall;
the method for adjusting the coke oven heating system with the high directional heating uniformity adjustable at any time comprises the following steps:
a jet of combustion air enters the bottom air supply heat exchange channel from the bottom air supply hole of the vertical flame path on the small flue connecting pipe and directly enters the vertical flame path through the bottom combustion air outlet; the second stream of combustion air enters the middle section air supply and heat exchange channel from the middle section air supply hole of the vertical flame channel on the small flue connecting pipe, and enters the vertical flame channel from the middle section combustion air outlet through the middle section combustion air channel; the third stream of combustion air enters the upper section air supply and heat exchange channel from the upper section air supply hole of the vertical flame path on the small flue connecting pipe, and enters the vertical flame path from the upper section combustion air outlet through the upper section combustion air channel; the air quantity of combustion-supporting air entering the vertical flame path from the bottom combustion-supporting air outlet is independently regulated by a bottom air inlet flow regulating device arranged at a bottom air supply hole of the vertical flame path, the air quantity of combustion-supporting air entering the vertical flame path from the middle section combustion-supporting air outlet is independently regulated by a middle section air inlet flow regulating device arranged at a middle section air supply hole of the vertical flame path, and the air quantity of combustion-supporting air entering the vertical flame path from the upper section combustion-supporting air outlet is independently regulated by an upper section air inlet flow regulating device arranged at an upper section air supply hole of the vertical flame path; the adjusting process can be carried out outside the furnace at any time;
the bottom air inflow of combustion air at the bottom of the vertical flame path is adjusted through the bottom air inflow adjusting device, so that the heating amount at the bottom of the vertical flame path is independently adjusted; the air inflow of combustion air entering the vertical flame path from the middle-section combustion-supporting gas outlet is regulated by the middle-section air inflow regulating device, so that the heating quantity of the middle-lower part of the vertical flame path is independently regulated; the air inflow of combustion air entering the vertical flame path from the upper combustion air outlet is regulated by the upper inlet air flow regulating device, so that the heating amount of the upper part of the vertical flame path is independently regulated; the 3 air inlet flow adjusting devices are matched for adjustment, so that the coke oven can be heated in a high-directional and uniform mode, and the generation of nitrogen oxides in the vertical flame path is restrained.
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| CN110511768B (en) * | 2019-09-03 | 2021-03-19 | 湖南千盟智能信息技术有限公司 | Coke oven heating combustion control method and system |
| CN113122284B (en) * | 2021-05-20 | 2023-05-16 | 中冶焦耐(大连)工程技术有限公司 | Low-nitrogen emission adjusting method for reheating coke oven |
| CN114276822A (en) * | 2022-01-18 | 2022-04-05 | 中钢设备有限公司 | Coke oven chute and combustion chamber air inflow adjusting method |
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