CN115433593B - Coke oven heating method matched with fineness of coal entering furnace - Google Patents
Coke oven heating method matched with fineness of coal entering furnace Download PDFInfo
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- CN115433593B CN115433593B CN202210954385.XA CN202210954385A CN115433593B CN 115433593 B CN115433593 B CN 115433593B CN 202210954385 A CN202210954385 A CN 202210954385A CN 115433593 B CN115433593 B CN 115433593B
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- 239000003245 coal Substances 0.000 title claims abstract description 162
- 239000000571 coke Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000010438 heat treatment Methods 0.000 title claims abstract description 17
- 238000002485 combustion reaction Methods 0.000 claims abstract description 47
- 230000033228 biological regulation Effects 0.000 claims abstract description 29
- 230000008859 change Effects 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 238000012216 screening Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000004939 coking Methods 0.000 claims description 19
- 238000010298 pulverizing process Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 6
- 238000003763 carbonization Methods 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008844 regulatory mechanism Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
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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
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
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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
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
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- 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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Abstract
The invention discloses a coke oven heating method matched with fineness of coal entering a furnace, which comprises the following steps: 1) Preliminary screening is carried out on the coal mixed with the coal fed into the furnace, and the fluctuation of water before and after the fineness change is controlled to be less than 1 percent and the fluctuation of volatile matters is controlled to be less than 1.5 percent; 2) The method has the advantages that the mixed coal to be added is subjected to a powder preparation process or a pre-crushing process, the temperature of the combustion chamber is adjusted according to the relative reference fineness of the mixed coal to be added or the fineness change condition before adjustment, and the heating method is optimized according to the fineness change requirement of the mixed coal to be added, so that the reasonable utilization of heating energy sources is facilitated, the waste of resources is avoided, and the further stabilization and the improvement of coke quality are facilitated; the related regulation and control method is simple and convenient to operate, can effectively solve the problems of coke quality fluctuation and the like caused by the traditional regulation and control process with the previous temperature detection result as guidance or based on artificial experience and the like, and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of top-loading coke oven coal blending coking, and particularly relates to a coke oven heating method matched with fineness of coal entering a coke oven.
Background
Different from a tamping coke oven, the fineness change range of the coal fed into the oven for top loading coke oven coking is wider, and the coal can be lifted from about 70% to more than 80%; the change of the fineness of the coal charged into the furnace affects the quality of the coke, and at the same time, the yield of the coke is firstly affected. Namely, the amount of coal charged into the carbonization chamber is changed on the premise of ensuring the same coal charging height. The coke oven is of a structure that the porous carbonization chambers are arranged side by side, and the two side combustion chambers of each porous carbonization chamber provide heat, so that coal cakes in the carbonization chambers are continuously carbonized into coke. When the amount of coal charged into the carbonization chamber changes, the required heat changes.
At present, the heat supply of the coke oven is adjusted, namely the temperature of the coke oven is changed, and the adjustment is mainly guided by the coke parameters obtained by carbonization, such as the center temperature of a coke cake, the maturity of a visual coke cake, the quality data of the coke and the like; or the fluctuation of the water content of the coal entering the furnace is taken as the main part, and the temperature of the coke oven is increased along with the increase of the water content. However, the existing regulation and control method generally has the problems of hysteresis quality of coke oven temperature adjustment, influence of human factors on accuracy and the like, and further causes the problems of coke quality fluctuation or reduction and the like.
Disclosure of Invention
The invention mainly aims to provide a coke oven heating method matched with the fineness of the coal entering the oven, which is optimized according to the changing requirement of the fineness of the coal entering the oven, is beneficial to reasonably utilizing heating energy, avoiding resource waste and further stabilizing and improving the quality of coke.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a coke oven heating method matched with fineness of coal entering a furnace comprises the following steps:
1) Preliminary screening is carried out on the coal matched with the furnace, the moisture change value (the difference value of the fineness before adjustment in the coke oven relative to the fineness regulation standard or the fineness before adjustment in the coke oven) is controlled to be less than 1 percent, and the volatile change value (the difference value of the volatile matters before adjustment in the coke oven) is controlled to be less than 1.5 percent;
2) The coal is fed into the furnace by adopting a process of preparing powder and then pulverizing (preparing powder and then pulverizing), and the specific thermodynamic regulation system comprises the following steps:
aiming at the process of preparing powder before preparing, determining the fineness regulation standard of the mixed coal to be 77-79%;
when the fineness of the fed coal is 3-5% relative to the fineness regulation reference, the temperature of the coke oven combustion chamber is increased or decreased by 1-3 ℃; wherein, the temperature of the corresponding coke oven combustion chamber is reduced when the fineness of the in-furnace coal is increased, and the temperature of the corresponding coke oven combustion chamber is increased when the fineness of the in-furnace coal is reduced.
Meanwhile, the fineness of the coal is controlled to 68-84%;
for the pre-crushing process, the thermal adjustment system of the powder preparation process or the following thermal adjustment system (preferably the following thermal adjustment system) is adopted, wherein the adopted mixed coal fed into the furnace is divided into a plurality of group coals according to fineness:
when the fineness of each crushed coal group is less than or equal to 2% of the change value of the fineness before adjustment, the adjustment of a thermal system is not needed, and the temperature of the combustion chamber of the original coke oven is kept;
when the variation amplitude of the fineness of each crushed coal group before adjustment in the coke oven exceeds 2%, further introducing the absolute value |M| of the product between the percentage content of the coal group and the numerical value of the fineness variation (relative to the initial coke oven material distribution system before adjustment) as a judgment standard for adjustment of a thermal system; when the M is less than or equal to 4, the temperature of the combustion chamber of the original coke oven is kept without thermal regulation; when the M is larger than 4, the thermal system is required to be adjusted; when the fineness is reduced relative to the reference fineness (M is a negative number), the temperature of the combustion chamber is increased; when the fineness is increased relative to the reference fineness (M is a positive number), the combustion chamber temperature is lowered.
In the above scheme, the fineness of the coal in the furnace is a value (difference value) obtained by subtracting the fineness regulation reference or the fineness before adjustment from the fineness value of the coal in the furnace compared with the fineness regulation reference or the fineness before adjustment of the powder preparation process.
In the above scheme, the product of the percentage of the group coal and the fineness change value is obtained by multiplying the percentage of the difference obtained by subtracting the fineness of the group coal corresponding to the original coal blending condition from the fineness of the group coal by 100 and multiplying the percentage of the group coal by the percentage.
In the scheme, for the powder preparation process, firstly, the quotient obtained by dividing the fineness of the matched coal by 5% relative to the reference fineness change value is taken as the multiple of reducing or increasing 1-3 ℃, and when the remainder exists (when the remainder is less than 5%), the temperature change absolute value is further reduced or increased by 1 ℃.
In the above scheme, specific thermal regulation system for the pre-crushing process, |M| >4 includes:
when M is less than or equal to 9 and 4 < | the temperature of the combustion chamber of the coke oven is adjusted to 1-3 ℃;
and when M < 9 >, the temperature of the coke oven combustion chamber is adjusted to 4-7 ℃.
Further, for the pre-crushing process, there are more than two groups of coal fineness, the variation range of which is more than 2% relative to the fineness before adjustment, and the product M between the percentage content of each group of coal and the variation value of the fineness of each group of coal is calculated respectively Group of Then adding, further using the obtained added value M And absolute value of |M And and taking the temperature as an evaluation index for evaluating the temperature adjustment system of the combustion chamber of the coke oven.
In the above scheme, the sum M And when the negative number is taken, the temperature of the combustion chamber is increased; sum value M And when the number is positive, the temperature of the combustion chamber is reduced.
In the scheme, in the pre-crushing process, the sum of the percentages of all the coal groups with fineness less than 68% is controlled to be less than 9%, and the sum of the percentages of all the coal groups with fineness more than 84% is controlled to be less than 20%.
In the scheme, the temperature of the combustion chamber refers to the average temperature of the representative flame path of the coke oven machine coke side.
In the above scheme, in the pre-crushing process, the crushed particle sizes of the matched coal groups are screened, wherein the coal groups are groups entering a crusher, namely, the coal groups participate in coking and blending, and the fineness of each coal is the same, each coal group can be one or a combination of several coals, and the sum of the percentage contents of all the coal groups is 100%.
In the scheme, the coal (each group of coal) to be mixed in the furnace can be selected from one or more of single coals such as gas coal, gas fat coal, coking coal, lean coal and the like, or the single coals are continuously subdivided into subclasses for combination; the fineness of the same group of coals is the same.
Preferably, the coking coal with the hardness or the particle size distribution close to that before crushing in the coal mixture fed into the furnace is a group, such as gas coal.
In the scheme, the initial setting temperature of the combustion chamber is 1290-1300 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the fineness change of the coal entering the furnace, a high-efficiency and energy-saving coke furnace heating method is provided, a reasonable and effective thermal regulation mechanism is adopted, so that the coke maturity is controlled, the coke quality is ensured and improved, the energy is saved, and the energy consumption of the coke furnace is reduced;
2) The regulation and control method can effectively solve the problems that the regulation and control method for the temperature of the combustion chamber of the traditional coke oven is generally guided by the early-stage temperature detection result, has lag adjustment and the like, and further influences the quality of coke; meanwhile, the uncertainty of artificial experience adjustment can be avoided, and the problems of furnace temperature and coke quality fluctuation and the like caused by repeated adjustment of the temperature of the coke oven are avoided.
Detailed Description
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
In the following embodiments, the efficient and energy-saving coke oven heating method is mainly provided according to fineness change of the coal mixed in the oven, and reasonable and effective temperature rise change adjustment is adopted, so that the coke maturity and coke quality can be controlled, the energy can be saved, and the energy consumption of the coke oven can be reduced. The G value is 15 to 20,
in the following examples, the coking coal with coarse grain mosaic structure more than or equal to 50% in lean coking coal accounts for more than 45%;
the Y value of the gas-fat coal and the fat coal is more than 25mm, the G value of the gas coal and the 1/3 coking coal is 77-90, the bonding index G value of the gas coal No. 1 is 87, the bonding index G value of the gas coal No. 2 is 77, and the G value of the lean coal is 45-60.
Example 1
A coke oven heating method matched with fineness of coal entering a furnace adopts a process of firstly preparing powder and then pulverizing, and specifically comprises the following steps:
1) Preliminary batching and screening are carried out on the mixed coal entering the furnace, and the moisture fluctuation before and after the fineness change is determined to be less than 1 percent, the volatile fluctuation is determined to be less than 1.5 percent, and the fineness regulation standard of the mixed coal is 78 percent;
the fineness of the coal matched with the furnace is detected, the numerical value is 78 percent, the method accords with the regulation standard 78+/-1 percent of the technology, and the measurement results after the fineness is changed are respectively shown in the table 1;
2) According to the fineness of the coal fed into the furnace of three ingredients measured after the fineness change, the temperature scheme of the combustion chamber is adjusted, and the specific regulation and control steps are as follows:
when the fineness of the matched coal is reduced by 5% compared with the reference fineness in the step 1), the temperature of the coke oven combustion chamber is increased by 1-3 ℃; when the fineness of the blended coal is divided by 5% to obtain a remainder, further increasing 1 ℃ (the absolute value of the temperature change of the combustion chamber is increased by 1 ℃);
when the fineness of the blended coal is increased by 5% relative to the reference fineness, the temperature of the coke oven combustion chamber is reduced by 1-3 ℃; when the fineness of the blended coal is divided by 5% to obtain a remainder, further lowering 1 ℃ (the absolute value of the temperature change of the combustion chamber is increased by 1 ℃);
meanwhile, the fineness of the coal-feeding blended coal is controlled to be 68-84%; the specific control results are shown in Table 1.
Table 1 results of temperature control of combustion chambers corresponding to fineness of coal charged into furnace for different coals described in example 1
| Fineness of coal fed into furnace | Combustor temperature/°c | Coke V daf /％ | Coke CSR/% | |
| Regulating reference | 78％ | 1297 | 1.20 | 66.6 |
| Batch 1 | 73％ | 1298 | 1.21 | 67.2 |
| Batch 2 | 83％ | 1294 | 1.15 | 66.3 |
| Batch 3 | 69％ | 1300 | 1.18 | 68.0 |
Wherein, the quality and the proportion of coal used for different coal types in the furnace-entering blended coal are the same according to the regulation standard and the ingredients 1, 2 and 3, and the concrete steps are as follows: the coking coal is 44%, the 1/3 coking coal is 26%, the fat coal is 18%, the lean coal is 12%, and the total proportion is 100%.
As can be seen from table 1, when the fineness of the charged coal was adjusted from 78% to 73%, the combustion chamber temperature increased by 1 ℃; wherein for the coal blending system, the fineness is reduced by 5 percent and the temperature is increased by 1 ℃;
when the fineness of the coal entering the furnace is adjusted from 78% to 83%, the temperature of the combustion chamber is reduced by 3 ℃; wherein, for the coal blending system, the fineness is increased by 5 percent and the temperature is reduced by 3 ℃;
when the fineness of the coal entering the furnace is adjusted from 78% to 69%, the temperature of the combustion chamber is increased by 3 ℃; wherein for the coal blending system, the fineness is reduced by 5 percent and the temperature is increased by 2 ℃; the fineness change value is divided by 5% to have a remainder, and the temperature change value at 1 ℃ is further increased.
By adopting the regulation mechanism, the volatile components (representing the maturity of the coke) and the fluctuation of CSR of the coke obtained under the coal blending conditions with different fineness are in the normal range; is beneficial to ensuring the quality of coke.
Example 2
A coke oven heating method matched with fineness of coal entering a furnace adopts a pre-crushing process, and specifically comprises the following steps:
1) Preliminary screening and grouping are carried out on the pre-crushed coal fed into the furnace, and the moisture fluctuation is determined to be less than 1% before and after the fineness change and the volatile fluctuation is determined to be less than 1.5%;
the mixed coal fed into the furnace is divided into a first group of coal and a second group of coal, wherein the first group of coal comprises gas coal No. 1 (the bonding index G value is 87) and gas coal No. 2 (the bonding index G value is 77), and the total proportion is 15 percent (the percentage content of the first group of coal); the coal types selected by the second group of coals are 43% of coking coal, 17% of fat coal, 12% of 1/3 coking coal and 13% of lean coal, and the percentage content of the second group of coals is 85%;
the fineness measurement results of the employed pre-crushed groups are shown in table 2, respectively;
2) According to the measured fineness of the pre-crushed grouped coal, the temperature scheme of the combustion chamber is adjusted, and the specific regulation and control steps are as follows:
when the variation amplitude of the fineness of each group of coal relative to the reference fineness is less than or equal to 2%, the temperature of the original combustion chamber is maintained.
Table 2 results of temperature control of combustion chambers corresponding to fineness of coal charged into furnace for different coals described in example 2
In Table 2, the sum of the percentages of the respective groups of coals having fineness of < 68% is 0%, and the sum of the percentages of the respective groups of coals having fineness of >84% is 0%.
The above results indicate that the volatile component V of the obtained coke is specific to the coal blending system and the thermal system corresponding to example 2 daf And CSR remains stable without significant fluctuations; is beneficial to ensuring the quality of coke.
Example 3
A coke oven heating method matched with fineness of coal entering a furnace adopts a pre-crushing process, and specifically comprises the following steps:
1) Preliminary screening and grouping are carried out on the pre-crushed coal fed into the furnace, and the moisture fluctuation is determined to be less than 1% before and after the fineness change and the volatile fluctuation is determined to be less than 1.5%;
wherein, the coal fed into the furnace is divided into a first group of coal and a second group of coal, the first group of coal is selected from gas coal and gas fat coal or lean coal, and the total proportion is 13 percent (the percentage content of the first group of coal is 13 percent); when the first group of coals are gas coals and gas fat coals, the second group of coals comprise the following coals in percentage by mass: 45% of coking coal, 15% of fat coal, 15% of 1/3 coking coal and 12% of lean coal, and when the first group of coals is lean, the second group of coals comprises the following coals in percentage by mass: 43% of coking coal, 19% of fat coal and 25% of 1/3 coking coal, wherein the total proportion of the second group of coal is 87% (the percentage content of the second group of coal is 87%); see in particular table 3;
the fineness measurement results of the employed pre-crushed groups are shown in table 3, respectively;
2) According to the measured fineness of the pre-crushed grouped coal, the temperature scheme of the combustion chamber is adjusted, and the specific regulation and control steps are as follows:
when the variation amplitude of the fineness of the group coals (the first group coals and/or the second group coals) before the relative fineness adjustment is more than 2%, further introducing a product M between the percentage content of the matched coals and the fineness variation value into a furnace as a judgment standard for the thermal regulation, wherein the judgment standard specifically comprises:
when M < 4 > is not greater than, the adjustment of a thermal system is not needed, and the temperature of the combustion chamber of the original coke oven is kept;
when M is less than or equal to 9 and 4 < | the temperature of the combustion chamber of the coke oven is adjusted to 1-3 ℃;
when M < 9 >, the temperature of the combustion chamber of the coke oven is adjusted to 4-7 ℃;
wherein, when the fineness is reduced relative to the reference fineness, the temperature of the combustion chamber is increased, and when the fineness is increased relative to the reference fineness, the temperature of the combustion chamber is reduced; the specific control results are shown in Table 3. (wherein, the fineness change value is further described as an example of the fineness change from 76% to 81%, the fineness change value is 5%, but the calculated value is 5).
Table 3 results of temperature control of combustion chamber corresponding to fineness of coal fed into furnace for different coals described in example 3
In Table 3, the sum of the percentages of the respective groups of coals having fineness of < 68% is 0%, and the sum of the percentages of the respective groups of coals having fineness of >84% is 0%.
By the above adjustment, volatile component V characterizing coke maturity daf (fluctuation range.+ -. 0.1%, and)<1.4%) and CSR (fluctuation range.+ -. 2% characterizing coke quality, and>65%) are fluctuated in the normal range, and the coke oven production is normal.
Comparative example 1
A traditional coal blending regulation and control process, aiming at the working condition of initial blending 2 corresponding to the embodiment 3, and further comparing the traditional process of empirically adjusting the temperature of a combustion chamber with the thermal regulation system of the invention, and the results are shown in Table 4; wherein the first group of coals adopts lean coals, and the percentage content of the lean coals is 13 percent; the second group of coals comprises the following coals in percentage by mass: 43% of coking coal, 19% of fat coal and 25% of 1/3 coking coal, and the percentage content of the second group of coal is 87%;
table 4 comparison of the control effects based on different blending temperature control mechanisms for comparative example 1 and example 3
The sum of the percentages of the respective groups of coals having fineness < 68% in table 4 is 0%, and the sum of the percentages of the respective groups of coals having fineness >84% is 0%.
As can be seen from Table 4, compared with the traditional regulation means based on experience or guided by the previous temperature detection result, the thermal regulation system can realize rapid and efficient regulation of the thermal system, is beneficial to controlling the coke maturity, ensuring and improving the coke quality, is beneficial to saving energy and reducing the energy consumption of the coke oven.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (7)
1. The coke oven heating method matched with the fineness of the coal matched with the coal fed into the oven is characterized by comprising the following steps of:
1) Preliminary screening is carried out on the coal mixed with the coal fed into the furnace, and the fluctuation of water before and after the fineness change is controlled to be less than 1 percent and the fluctuation of volatile matters is controlled to be less than 1.5 percent;
2) The coal is fed into the furnace by adopting a process of preparing powder before pulverizing or pre-pulverizing, and the specific thermal adjustment system comprises the following steps:
aiming at the process of preparing powder firstly and then adding coal into a furnace, the fineness regulation standard of the mixed coal is 77-79%;
when the fineness of the coal to be mixed in the furnace is 3-5% relative to the fineness regulation standard, the temperature of the combustion chamber of the coke oven is increased or reduced by 1-3 ℃; wherein, when the fineness of the coal mixed in the furnace is increased, the temperature of the corresponding coke oven combustion chamber is reduced, and when the fineness of the coal mixed in the furnace is reduced, the temperature of the corresponding coke oven combustion chamber is increased;
aiming at the pre-crushing process, the thermal adjustment system of the powder preparation process or the following thermal adjustment system is adopted, wherein the adopted mixed coal fed into the furnace is divided into a plurality of group coals according to fineness:
when the fineness of each crushed coal group is less than or equal to 2% of the change value of the fineness before adjustment, the adjustment of a thermal system is not needed, and the temperature of the combustion chamber of the original coke oven is kept;
when the variation value of the fineness of the group coal relative to the fineness before adjustment is more than 2%, further introducing an absolute value |M| of the product between the percentage content of the corresponding group coal and the fineness variation value as a judgment standard for adjustment of a thermal system; when the M is less than or equal to 4, the temperature of the combustion chamber of the original coke oven is kept without thermal regulation; when the M is 4, the thermal system is required to be adjusted; when the fineness is reduced relative to the reference fineness, the temperature of the combustion chamber is increased, and when the fineness is increased relative to the reference fineness, the temperature of the combustion chamber is reduced.
2. The method according to claim 1, wherein for the powder-before-charge process, the quotient obtained by dividing the fineness of the charged coal mixture by 5% is used as a multiple of 1 to 3 ℃ and the remainder is further reduced or increased by 1 ℃.
3. The method according to claim 1, wherein the fineness of the coal charged into the oven is controlled to be 68-84% in the powder-after-preparation process.
4. The method of claim 1, wherein the specific thermal regulation regime for the pre-crushing process, |m| >4, comprises:
when M is less than or equal to 9 and 4 < | the temperature of the combustion chamber of the coke oven is adjusted to 1-3 ℃;
and when M < 9 >, the temperature of the coke oven combustion chamber is adjusted to 4-7 ℃.
5. The method according to claim 1, wherein the sum of percentages of the respective groups of coals having a fineness of less than 68% is controlled to be 9% or less and the sum of percentages of the respective groups of coals having a fineness of >84% is controlled to be 20% or less simultaneously in the pre-pulverization process.
6. The method for heating a coke oven according to claim 1, wherein the coal mixture charged into the oven is one or more of gas coal, gas fat coal, coking coal, and lean coal.
7. The coke oven heating method according to claim 1, wherein the initial set temperature of the combustion chamber temperature is 1290 to 1300 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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