CN110305680B - Coking method with simple operation and accurate determined dry coal ratio - Google Patents
Coking method with simple operation and accurate determined dry coal ratio Download PDFInfo
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- CN110305680B CN110305680B CN201910292014.8A CN201910292014A CN110305680B CN 110305680 B CN110305680 B CN 110305680B CN 201910292014 A CN201910292014 A CN 201910292014A CN 110305680 B CN110305680 B CN 110305680B
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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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Abstract
A coking method which is simple to operate and determines accurate proportion of dry coal comprises the following steps: obtaining a blended coal sample; drying part of the blended coal sample; determining the mixing proportion of the dried mixed coal sample; and (3) carrying out charging coking tests on dry and wet blended coal with different proportions, wherein the detected value is not more than the detected value of the dust of the original wet coal, and the measured bulk density value is 12% lower than that of the original wet coal. Compared with the prior art, the method has the advantages that the existing production process is not changed, the adverse effect on the existing coking production is not brought, the dry coal amount is reduced, the test efficiency is improved, the operation is simple, the proper control proportion of the dry coal is determined to be accurate, the dry coal proportioning can be stabilized in production according to the proportion after the dry coal proportion is determined through the test, the on-site combination degree is high, the production fluctuation is small, and the method has obvious significance for guiding on-site production.
Description
Technical Field
The invention relates to a coking method, and particularly belongs to a method for testing dry and wet coal combined coking.
Background
In order to meet the requirements of controlling coking wastewater from the source, saving energy, reducing consumption, improving coke yield and the like, the coking industry develops a coking coal pretreatment technology. The method comprises a coal moisture control technology, wherein the moisture of the blended coal is controlled to be 6-9%, the moisture of the blended coal is dried to be below 2% by a DAPS process, and the like.
Compared with the conventional wet coal charging technology, the coal drying technology has certain improvements in the aspects of production efficiency, energy conservation and the like, but all the blended coal is dried and is charged for coking after being dried to the target moisture. The technology of drying all the blended coal to the moisture required for coking has benefits of improving production efficiency, saving energy and the like, but needs to greatly adjust the prior process, so that the engineering quantity is large, and the adaptability of the prior coke oven, coal resources and the like to the prior art is poor. And after the coal is dried, the dust is generated in the processes of transportation, loading and the like to influence the production operation, and after the coal is dried, the coke pushing operation is also adversely affected due to the substantial increase of the bulk density, so that the safe production and the service cycle of the coke oven are affected. Therefore, the method is limited in popularization and application. If, retrieve:
the Chinese patent application No. CN201410686839.5 discloses a high-efficiency energy-saving humidifying process for high-moisture coking coal. Screening wet coal to obtain coal materials with the granularity of below 10mm, screening the coal materials below the screen with a fluidized bed screening machine with a humidifying function to obtain coal materials with the granularity of below 4mm, and completely crushing the coal materials with the granularity of above 4 mm; then humidifying the moisture content of the coal material with the granularity of less than 4mm from 11-15% to 6%; and recovering coal dust in the gas discharged by the sieving machine and the humidity regulator, granulating, mixing the crushed and humidified coal material and the dedusting and granulating coal material by a mixing device, and then feeding the mixture into a coal tower for coking.
Further, chinese patent application No. CN201611064226.3 discloses "a coal blending method by partial humidity control and staged crushing". Firstly, carrying out primary pre-crushing on coking coal with Mohs hardness of more than 2.5, wherein the proportion of the granularity of less than 3mm accounts for more than 50%; carrying out secondary crushing on the granular coal with the granularity of more than or equal to 5mm until the proportion of the crushed granular coal with the granularity of less than 3mm accounts for 83% +/-2%; drying the water content of the fine granular coal with the undersize granularity of less than 3mm from 10-14% to 6-8%; and mixing the coarse-particle coal with the granularity of more than or equal to 3mm after secondary crushing and the fine-particle coal subjected to coal moisture control by a coal mixer, and feeding the mixture into a coke oven coal tower for coking.
Both of the above documents have the following problems: different enterprises are different from coal mining points, most of mines have coal blending conditions, and coal blending structures are different, so that the crushing amount and the drying amount have differences, and the final operation stability is influenced. In addition, when the moisture and the granularity of the coal entering the furnace are changed, the specific gravity of the coal charge pile in the carbonization chamber is changed, the coke pushing is difficult, and the coke pushing operation is influenced.
Disclosure of Invention
The invention aims to determine the blending proportion of the dry coal in a laboratory in advance, provides a dry coal blending proportion guidance suitable for the existing coking production process, stabilizes the dry coal amount, greatly improves the production implementation difficulty, is simple to operate, and determines the proper control proportion of the dry coal to be accurate.
The measures for realizing the aim are as follows:
a coking method which is simple to operate and determines accurate proportion of dry coal comprises the following steps:
1) obtaining a blended coal sample: taking the mixed coal for production with the amount not less than 10kg, controlling the particle size of the mixed coal for production less than 3mm not less than 75% and the rest of the mixed coal with the particle size of more than or equal to 3mm to less than 10 mm;
2) drying part of the blended coal sample, taking 40-50% of the total weight of the blended coal sample for drying, and controlling the water content of the dried blended coal sample to be 2-4 wt%; the rest of the raw wet coal accounts for 50-60% of the total weight of the blended coal sample and is used for later use;
detecting the raise dust value of the raw wet coal: the dust raising value is obtained by detecting the raw wet coal falling height is not less than 0.2 m; the original wet coal amount used for measurement is consistent with the wet coal amount of the measured bulk density;
3) determining the mixing proportion of the dried mixed coal sample:
A. detecting the bulk density of the raw wet coal in the step 2) in an amount of 15-40% of the total weight percentage, compressing the raw wet coal to the bulk density consistent with the production through pressure application, and recording the applied pressure value;
B. mixing the original wet coal and the dried blended coal sample according to different proportions and uniformly mixing;
C. detecting and judging the bulk density of the dry and wet blended coal which is uniformly mixed according to the proportion:
measuring the bulk density of the dry and wet blended coal which is uniformly mixed according to the proportion: setting the applied pressure to be the same as the pressure applied by measuring the bulk density of the original wet coal to obtain the bulk density value of the wet coal;
when the measured bulk density value of the dry and wet blended coal which is uniformly mixed according to the proportion is 12 percent higher than that of the original wet coal, the test is not required to be continuously carried out;
D. carrying out detection and judgment on the dust raising amount of the dry and wet blended coal which is uniformly mixed according to the proportion:
when the measured dust emission detection value of the dry and wet blended coal which is uniformly mixed according to the proportion is larger than the original wet coal dust emission detection value, the test is not required to be continuously carried out;
when the measured dust emission detection value of the dry and wet blended coal which is uniformly mixed according to the proportion is less than or equal to the original wet coal dust emission detection value, continuing the test;
4) and (3) carrying out charging coking tests on dry and wet blended coal with different proportions, wherein the detected value is not more than the detected value of the dust of the original wet coal, and the measured bulk density value is 12% lower than that of the original wet coal.
It is characterized in that: when the dry coal proportion exceeds 10%, high-shrinkage coking coal is added, and the adding amount is controlled not to exceed 8% of the total weight of the blended coal.
It is characterized in that: after the detection of the amount of dust and the detection of the bulk density are performed for each dry and wet blended coal mixed uniformly in proportion, the discrimination is performed according to the method C, D in the step 3).
The invention controls the grain size of the produced blended coal amount to be not less than 75% of the grain size of 3mm, and controls the uniformity of the coal material on the premise of keeping the same with the production by controlling the blended coal sample with the grain size of more than or equal to 3mm to less than 10mm as the rest.
The invention detects the bulk density of the raw wet coal in an amount of 15-40% of the total weight of the raw wet coal, and compresses the raw wet coal to the bulk density consistent with the production by applying pressure, so that the control data are representative, and the detected data can be consistent with the production.
The invention adopts the same pressure value applied to the bulk density of the original wet coal to detect the bulk density of the dry and wet blended coal which is uniformly mixed according to different proportions, and when the measured bulk density value of the dry and wet blended coal which is uniformly mixed according to proportions is higher than the bulk density value of the original wet coal by 12 percent, the test is not required to be continuously carried out on the dry and wet blended coal.
Or respectively detecting and judging the dust amount of the dry and wet blended coal uniformly mixed according to the proportion, and when the detected dust amount value of the measured dry and wet blended coal uniformly mixed according to the proportion is less than or equal to the detected dust amount value of the original wet coal, continuously testing the dry and wet blended coal; when the measured dust quantity detection value of the dry and wet blended coal which is uniformly mixed according to the proportion is larger than the original wet coal dust quantity detection value, the dry and wet blended coal does not need to be tested continuously, one of the biggest difficulties of the dry coal process (including the coal moisture control process) in production is the influence of dust generated in the process on the current process and subsequent process operation and products, and in order to avoid the influence of dust, the dust generated in the process of the dry and wet coal must be controlled.
Compared with the prior art, the invention can control the number of transfer stations in the prior art on the premise of not changing the prior production process and not bringing adverse effects to the coking production at present, takes the change of the bulk specific gravity of the dried coal as fired into consideration, and only partially dries the coal as fired, thereby not only reducing the amount of the dried coal, improving the test efficiency and saving energy, but also greatly improving the difficulty of production implementation, being simple to operate and determining the proper control proportion of the dried coal, and after the proportion of the dried coal is determined by experiments, the production can stabilize the dry coal proportioning according to the proportion, the degree of combination with the site is high, the production fluctuation is small, and the invention has obvious significance for guiding the site production.
Detailed Description
The present invention is described in detail below:
the following examples all use the same type of site-use coal blend: the bulk specific gravity of the blended coal is 0.67g/cm3(ii) a The coal loading of the test coke oven is 2 Kg; the method is characterized in that the whole original wet coal is used as a standard sample, and the dry and wet coal mixing proportion of 5 embodiments of 1# sample to 4# sample is as follows according to the weight percentage wt% respectively: 15: 85, 30: 70, 40: 60, 50: 50, 70: 30 the test was carried out according to the following procedure.
The test steps are as follows:
1) obtaining a crushed blended coal sample: taking 10kg of uniformly mixed production blending coal, wherein the particle size of the obtained production blending coal sample is 75% of the particle size of 3mm, and the rest 25% of the obtained production blending coal sample is the blending coal sample with the particle size of more than or equal to 3mm to less than 10 mm;
2) drying part of the blended coal sample, taking 45% of the total weight of the blended coal sample, namely 4.5 kg for drying, and controlling the moisture content of the dried blended coal sample to be 2-4 wt%; the rest accounts for 55 percent of the total weight of the blended coal sample, namely 5.5 kg of the weight of the blended coal sample is the original wet coal for standby;
and the dust of the raw wet coal is detected under the condition that the blanking height is 0.5m, and the dust value is 0.001g/m3；
3) Determining the mixing proportion of the dried mixed coal sample: the total sample amount of charging is 2 kg; mixing wet coal according to 100%, 85%, 70%, 60%, 50% and 30% of 2kg, and dry coal according to 0%, 15%, 30%, 40%, 50% and 70% respectively with the wet coal until uniform, wherein the wet coal is respectively 1# sample, 2# sample, 3# sample, 4# sample, 5# sample and 6# sample, and the 1# sample is a standard sample;
A. detection ofThe bulk specific gravity of the sample No. 1 in the step 3) was compressed to a bulk specific gravity of 0.67g/cm in accordance with the production after applying a pressure of 4660kg3And recording the pressure value applied by the pressure sensor;
B. applying 4660kg force on the samples 2#, 3#, 4#, 5# and 6# in the step 3), detecting and judging the bulk density:
the respective bulk specific gravity values obtained were: the bulk specific gravity of the No. 2 sample dry and wet blended coal is 0.68 g/cm3Bulk specific gravity of 0.67g/cm higher than that of original wet coal3The improvement is 2%; the bulk specific gravity of the No. 3 sample dry and wet blended coal is 0.71g/cm3Bulk specific gravity of 0.67g/cm higher than that of original wet coal3The improvement is 6%; the bulk specific gravity of the No. 4 sample dry and wet blended coal is 0.73g/cm3Bulk specific gravity of 0.67g/cm higher than that of original wet coal3The improvement is 9%; the bulk specific gravity of the No. 5 sample dry and wet blended coal is 0.85g/cm3Bulk specific gravity of 0.67g/cm higher than that of original wet coal3The improvement is 12%; the bulk specific gravity of the No. 6 sample dry and wet blended coal is 0.85g/cm3Bulk specific gravity of 0.67g/cm higher than that of original wet coal3The improvement is 26%; the results are shown in Table 1;
TABLE 1 Stack specific gravity detection and determination
| Examples | 1# | 2# | 3# | 4# | 5# | 6# |
| Wet coal/%) | 100 | 85 | 70 | 60 | 50 | 30 |
| Dry coal/% | 0 | 15 | 30 | 40 | 50 | 70 |
| Bulk specific gravity increase ratio/%) | － | 2 | 6 | 9 | 12 | 26 |
| Discrimination | － | Continuation of the test | Continuation of the test | Continuation of the test | Is not available | Is not available |
According to the determination standard of the bulk specific gravity, the bulk specific gravity of the No. 5 sample dry and wet blended coal is 0.67g/cm higher than that of the original wet coal3The bulk specific gravity of the No. 6 sample dry and wet blended coal is improved by 12 percent and is 0.67g/cm higher than that of the original wet coal3The improvement is 26%, so that the test is not required to be carried out continuously;
C. detecting and distinguishing the dust amount of the sample No. 2, the sample No. 3, the sample No. 4, the sample No. 5 and the sample No. 6 in the step 3):
the sample No. 1 is known to be detected by the dust of the raw wet coal blanking under the blanking height of 0.5m, and the dust value is 0.01g/m3；
Similarly, the dust of the 2# sample, the 3# sample, the 4# sample, the 5# sample and the 6# sample is detected under the condition that the blanking height is 0.5m, and the detection result is shown in the table 2;
TABLE 2 dust detection and determination
| Examples | 1# | 2# | 3# | 4# |
| Wet coal/%) | 100 | 85 | 70 | 60 |
| Dry coal/% | 0 | 15 | 30 | 40 |
| Dust amount/g/cm3 | 0.01 | 0.01 | 0.1 | 0.4 |
| Discrimination | － | Continuation of the test | Is not available | Is not available |
According to the judgment standard, the dust amount detection value of 3# and 4# dry and wet blended coal is greater than the original wet coal dust amount detection value, and the test is not required to be continuously carried out;
4) the coke oven charging and coking test was carried out on 2# dry-wet blended coal whose detection value was not greater than the detection value of the dust of the original wet coal and whose measured bulk density value was 12% lower than that of the original wet coal, and the behavior of the coked carbon was shown in Table 3.
The mixing ratio of dry coal and wet coal is determined, wherein the wet coal accounts for 85wt%, and the dry coal accounts for 15 wt%. And because the dry coal proportion exceeds 10%, the high-shrinkage coking coal is added, and the addition amount of the high-shrinkage coking coal is 3% of the total weight of the blended coal.
TABLE 3 Coke quality in this example
| Examples | M10/% | M25/% | CRI/% | CSR/% |
| 1#Sample (A) | 8.4 | 86.9 | 25.4 | 63.5 |
| Sample No. 2 | 8.3 | 87 | 25 | 63.8 |
From the results shown in Table 3, it was found that the coke quality was improved, the cold strengths M25 and M10, and the hot strengths CRI and CSR were improved to different degrees, as compared with the standard sample No. 1, when 15% dry coal was blended in the case of the protocol No. 2, and the percentage increase in bulk density and dust generation were satisfactory, and thus the protocol was usable.
The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.
Claims (3)
1. A coking method which is simple to operate and determines accurate proportion of dry coal comprises the following steps:
1) obtaining a blended coal sample: taking the mixed coal for production with the amount not less than 10kg, controlling the particle size of the mixed coal for production less than 3mm not less than 75% and the rest of the mixed coal with the particle size of more than or equal to 3mm to less than 10 mm;
2) drying part of the blended coal sample, taking 40-50% of the total weight of the blended coal sample for drying, and controlling the water content of the dried blended coal sample to be 2-4 wt%; the rest of the raw wet coal accounts for 50-60% of the total weight of the blended coal sample and is used for later use;
detecting the raise dust value of the raw wet coal: the dust raising value is obtained by detecting the raw wet coal falling height is not less than 0.2 m; the original wet coal quantity used for measurement is consistent with the wet coal quantity of the measured bulk density;
3) determining the mixing proportion of the dried mixed coal sample:
A. detecting the bulk density of the raw wet coal in the step 2) in an amount of 15-40% of the total weight percentage, compressing the raw wet coal to the bulk density consistent with the production through pressure application, and recording the applied pressure value;
B. mixing the original wet coal and the dried blended coal sample according to different proportions and uniformly mixing;
C. detecting and judging the bulk density of the dry and wet blended coal which is uniformly mixed according to the proportion:
measuring the bulk density of the dry and wet blended coal which is uniformly mixed according to the proportion: setting the applied pressure to be the same as the pressure applied by measuring the bulk density of the original wet coal to obtain the bulk density value of the wet coal;
when the measured bulk density value of the dry and wet blended coal which is uniformly mixed according to the proportion is 12 percent higher than that of the original wet coal, the test is not required to be continuously carried out;
D. carrying out detection and judgment on the dust raising amount of the dry and wet blended coal which is uniformly mixed according to the proportion:
when the measured dust emission detection value of the dry and wet blended coal which is uniformly mixed according to the proportion is larger than the original wet coal dust emission detection value, the test is not required to be continuously carried out;
when the measured dust emission detection value of the dry and wet blended coal which is uniformly mixed according to the proportion is less than or equal to the original wet coal dust emission detection value, continuing the test;
4) and (3) carrying out charging coking tests on dry and wet blended coal with different proportions, wherein the detected value is not more than the detected value of the dust of the original wet coal, and the measured bulk density value is 12% lower than that of the original wet coal.
2. The coking method with simple operation and accurate determination of the dry coal proportion as claimed in claim 1, wherein: when the dry coal proportion exceeds 10%, high-shrinkage coking coal is added, and the adding amount is controlled not to exceed 8% of the total weight of the blended coal.
3. The coking method with simple operation and accurate determination of the dry coal proportion as claimed in claim 1, wherein: after the dust amount and the bulk density of each dry and wet blended coal mixed uniformly in proportion are detected, the determination is carried out according to the method C, D in the step 3).
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09328689A (en) * | 1996-06-11 | 1997-12-22 | Kawasaki Steel Corp | Water content control of raw material coal for coke |
| CN101717653A (en) * | 2009-12-11 | 2010-06-02 | 本溪鹤腾高科技研发（中心）有限公司 | Treatment method before carbonizing coking coal |
| TWI553112B (en) * | 2015-08-03 | 2016-10-11 | 中國鋼鐵股份有限公司 | Method for suppressing coal dust in coal moisture control process and coke-making procedure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101793643B (en) * | 2010-02-09 | 2011-08-03 | 武汉钢铁(集团)公司 | Method for refining coke used for measuring coke optical texture |
| CN103194265B (en) * | 2013-04-10 | 2014-12-24 | 山西鑫立能源科技有限公司 | Thermal cycle continuous comprehensive method employing pyrolysis gasification of coal gangue |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09328689A (en) * | 1996-06-11 | 1997-12-22 | Kawasaki Steel Corp | Water content control of raw material coal for coke |
| CN101717653A (en) * | 2009-12-11 | 2010-06-02 | 本溪鹤腾高科技研发（中心）有限公司 | Treatment method before carbonizing coking coal |
| TWI553112B (en) * | 2015-08-03 | 2016-10-11 | 中國鋼鐵股份有限公司 | Method for suppressing coal dust in coal moisture control process and coke-making procedure |
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