CN108264914B - Method for controlling coal quality stability in coking coal drying process - Google Patents

Method for controlling coal quality stability in coking coal drying process Download PDF

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CN108264914B
CN108264914B CN201711446745.0A CN201711446745A CN108264914B CN 108264914 B CN108264914 B CN 108264914B CN 201711446745 A CN201711446745 A CN 201711446745A CN 108264914 B CN108264914 B CN 108264914B
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陈细涛
薛改凤
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Wuhan Iron and Steel Co Ltd
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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
    • C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
    • C10B57/10—Drying
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content

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Abstract

The invention discloses a coking coal drying processA control method of medium coal quality stability belongs to the technical field of coal drying. The method comprises the following steps of (1) dividing wet coking coal to be dried into a plurality of samples, drying one sample in air, and drying the rest in an oven with the preset temperature of 100-300 ℃; taking out one sample at the same time interval to measure the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is kept unchanged and the drying is complete; comparing the bond index between the sample dried in the air and the sample dried in the oven to obtain the coal moisture M with controllable coal quality stabilityctAnd coal temperature TctThe following mathematical relation is satisfied: if the drying temperature is more than or equal to 100 ℃ and less than or equal to 120 ℃, the water content M of the coal material isctGreater than 0, coal temperature TctLess than or equal to 105 ℃; if the drying temperature is more than 120 ℃ and less than or equal to 300 ℃, the moisture M of the coal materialctNot less than 0.20 percent and coal temperature TctLess than or equal to 130 ℃. The method has strong reliability of the measured result and has guiding significance for controlling the moisture of the coal material in the large-scale coking process.

Description

Method for controlling coal quality stability in coking coal drying process
Technical Field
The invention relates to a coal quality control method, belongs to the technical field of coal drying, and particularly relates to a control method for coal quality stability in a coking coal drying process.
Background
The coking coal is mainly used for coking coal in a coke oven, the coking coal is generally 10-12% of water, the water enters the coke oven to form toxic and harmful coking wastewater, the treatment process is complex, and the cost is high. In order to clean the coking process, research on drying and dewatering outside a coke oven represented by a coal moisture control technology and the like has a research heat tide in China, related factors need to be controlled when coal is dried, heated and dewatered outside the coke oven, otherwise, the quality of the generated coke inevitably deteriorates once the coal slides down.
For example, in coal conversion 2014, volume 37, phase 4, a document of experimental research on the influence of microwave drying on the coal quality of coking coal is reported, and the document selects characteristic indexes of different coking coals and analyzes and compares the characteristic indexes before and after microwave drying, and the result shows that the microwave drying technology has no obvious influence on industrial analysis and caking index of the coking coal while removing the moisture of the coking coal, has positive influence on Kirschner fluidity and Australian expansion degree, but has no obvious influence on a colloidal body, and particularly has process behavior.
For example, the 3 rd volume of the 29 rd volume of the book, volume, proceedings of Wuhan project profession and technology academy of engineering, 2017, 9 th month, discloses a change rule of coal temperature and water content in a coking coal drying process, in order to investigate the influence of coking coal on the coal quality in the drying process, the change condition of the coal temperature and the water content in the drying process of the blended coal at 107-300 ℃ is investigated, the coal temperature is firstly quickly increased in the heating process, then the coal temperature enters a platform stage, the temperature is finally increased, the water content is in an index decreasing trend, the caking index is carried out on a dried sample, and the coal quality is not changed compared with the original sample, which indicates that the coal quality of the coking coal can be ensured to be unchanged by controlling the water content in the heating process.
However, in the actual drying production process, the control and monitoring of the moisture of the coal material have a certain hysteresis effect, and the stability of the coal quality seriously influences the result of later coking.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a test about a coal quality stability control method before large-scale coking, which starts from two aspects of coal moisture and coal temperature in the coking coal drying process and monitors a relational expression between the drying temperature and the coal moisture and the coal temperature.
In order to achieve the aim, the invention discloses a method for controlling coal quality stability in a coking coal drying process, which comprises the following steps:
1) dividing wet coking coal to be dried into a plurality of samples, drying one sample in air, and drying the rest in an oven with the preset temperature of 100-300 ℃;
2) taking out one sample at the same time interval to measure the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is kept unchanged and the drying is complete;
3) comparing the bonding index between the sample dried in the air and the sample dried in the oven, wherein if the difference between the bonding index of the sample dried in the oven and the bonding index of the sample dried in the air is more than 3, namely if the temperature of the coal material is continuously increased, the coal material has a tendency of going bad;
obtaining the coal material moisture M with controllable coal quality stabilityctAnd coal temperature TctThe following mathematical relation is satisfied:
if the temperature is less than or equal to 100 DEG CThe drying temperature is less than or equal to 120 ℃, and then the moisture M of the coal materialctGreater than 0, coal temperature Tct≤105℃；
If the drying temperature is more than 120 ℃ and less than or equal to 300 ℃, the moisture M of the coal materialctNot less than 0.20 percent and coal temperature Tct≤130℃。
Further, the bonding index of the sample dried in the air is 65-90, and preferably 80.
Still further preferably, the selected wet coking coal caking index G080% of initial coal moisture M0The content was 10.1%.
Still further preferably, the selected wet coking coal caking index G080% of initial coal moisture M0The content was 10.4%.
Has the advantages that:
the coal quality stability control method belongs to a small-scale test before coking, monitors a relational expression between drying temperature and coal moisture and coal temperature from the two aspects of coal moisture and coal temperature in the coking coal drying process, and has the advantages of simple operation, low cost, strong reliability of measured results and guiding significance for coal moisture control in the large-scale coking process.
Detailed Description
In order to better explain the invention, the following further illustrate the main content of the invention in connection with specific examples, but the content of the invention is not limited to the following examples.
Example 1
The embodiment discloses a method for controlling coal quality stability in a coking coal drying process, which comprises the following steps:
1) taking wet coking coal to be dried, and measuring the caking index G of the wet coking coal080% of initial coal moisture M010.1 percent; in this embodiment, it is preferable that the caking index of the wet coking coal and the relevant parameters of the moisture of the initial coal material are as described above, but the control method of the present invention is applicable to any selected wet coking coal.
2) Condensing the wet coking coal obtained in the step 1) into at least 20 parts of samples, taking one part of the samples to dry in the air, and placing the rest of the samples in an oven with the preset temperature of 100 ℃ to dry;
3) taking out one sample at the same time interval, measuring the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is not changed and the drying is complete to obtain the table 1;
4) comparing the bond index between the sample dried in the air and the sample dried in the oven to obtain the coal moisture M with controllable coal quality stabilityctAnd coal temperature Tct；
TABLE 1 coal Property List (I)
Figure BDA0001527701690000031
Figure BDA0001527701690000041
As can be seen from Table 1, when the test sample is dried to the 20 th min, the moisture content of the coal material is reduced to 0, the G value is reduced to 77, the caking index is 80 compared with the air-dried sample, the coal quality tends to deteriorate, and the temperature of the coal material is 92 ℃, namely, at the drying temperature of 100 ℃, the moisture content M of the coal material is known to bectThe coal quality is controllable at the temperature of more than 0 percent and the coal temperature within 92 ℃.
Example 2
The embodiment discloses a method for controlling coal quality stability in a coking coal drying process, which comprises the following steps:
1) taking wet coking coal to be dried, and measuring the caking index G of the wet coking coal080% of initial coal moisture M010.1 percent;
2) condensing the wet coking coal obtained in the step 1) into at least 20 parts of samples, taking one part of the samples to be dried in the air, and drying the rest in an oven with the preset temperature of 110 ℃;
3) taking out one sample at the same time interval, measuring the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is not changed and the drying is complete to obtain a table 2;
4) comparing the bond index between the sample dried in the air and the sample dried in the oven to obtain the coal moisture M with controllable coal quality stabilityctAnd coal temperature Tct；
TABLE 2 coal Property List (II)
Sample (I) Time/min Water content/%) Temperature/. degree.C G value
1 0 10.1 20 80
2 1 9.9 31 80
3 2 9.7 47 80
4 3 8.8 55 79
5 4 8.0 53 81
6 5 7.5 55 80
7 6 6.0 58 81
8 7 5.2 60 79
9 8 4.4 61 80
10 9 3.8 65 81
11 10 3.3 68 80
12 11 2.6 69 81
13 12 2.2 70 80
14 13 1.9 73 81
15 14 1.5 80 79
16 15 1.0 89 80
17 16 0.4 94 81
18 17 0.0 96 80
19 18 0.0 100 78
20 19 0.0 103 77
Air drying sample - 1.6 20 80
As can be seen from the above Table 2, when the test sample was dried to 19min, the moisture content of the coal material was reduced to 0, the G value was reduced to 77, the caking index was 80 compared to the air-dried sample, and the coal quality tended to deteriorate, and the temperature of the coal material was 103 ℃ at this time, i.e., the moisture content M of the coal material was found to be at a drying temperature of 110 ℃ctThe coal quality is controllable at the temperature of more than 0 percent and within 103 ℃.
Example 3
The embodiment discloses a method for controlling coal quality stability in a coking coal drying process, which comprises the following steps:
1) taking wet coking coal to be dried, and measuring the caking index G of the wet coking coal080% of initial coal moisture M010.1 percent;
2) condensing the wet coking coal obtained in the step 1) into at least 20 parts of samples, taking one part of the samples to dry in the air, and placing the rest of the samples in an oven with the preset temperature of 120 ℃ to dry;
3) taking out one sample at the same time interval, measuring the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is not changed and the drying is complete to obtain a table 3;
4) comparing the bond index between the sample dried in the air and the sample dried in the oven to obtain the coal moisture M with controllable coal quality stabilityctAnd coal temperature Tct；
TABLE 3 coal Property List (III)
Sample (I) Time/min Water content/%) Temperature/. degree.C G value
1 0 10.1 20 80
2 1 9.8 20 80
3 2 9.4 32 80
4 3 8.5 46 80
5 4 7.6 53 81
6 5 6.8 59 81
7 6 5.4 60 79
8 7 4.2 59 79
9 8 2.9 61 80
10 9 1.6 61 80
11 10 1.1 62 81
12 11 0.8 70 80
13 12 0.6 75 80
14 13 0.3 80 79
15 14 0.2 86 78
16 15 0.1 88 78
17 16 0 93 78
18 17 0 105 76
19 18 - - -
20 19 - - -
Air drying sample - 1.6 20 80
As can be seen from Table 3, when the test sample was dried to 17min, the moisture content of the coal material was reduced to 0, the G value was reduced to 76, the caking index was 80 compared to the air-dried sample, and the coal quality tended to deteriorate, and the temperature of the coal material was 105 ℃ at this time, i.e., the moisture content M of the coal material was found to be 120 ℃ at the drying temperaturectThe coal quality is controllable within the range of more than 0 percent and the temperature of the coal material within 105 ℃.
Example 4
The embodiment discloses a method for controlling coal quality stability in a coking coal drying process, which comprises the following steps:
1) taking wet coking coal to be dried, and measuring the caking index G of the wet coking coal080% of initial coal moisture M010.4 percent; in this embodiment, it is preferable that the caking index of the wet coking coal and the relevant parameters of the moisture of the initial coal material are as described above, but the control method of the present invention is applicable to any selected wet coking coal.
2) Condensing the wet coking coal obtained in the step 1) into at least 20 parts of samples, taking one part of the samples to be dried in the air, and drying the rest in an oven with the preset temperature of 150 ℃;
3) taking out one sample at the same time interval, measuring the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is not changed and the drying is complete to obtain a table 4;
4) comparing the bond index between the sample dried in the air and the sample dried in the oven to obtain the coal moisture M with controllable coal quality stabilityctAnd coal temperature Tct；
TABLE 4 coal Property List (IV)
Figure BDA0001527701690000071
Figure BDA0001527701690000081
As can be seen from Table 4, when the test sample was dried for 13min, the moisture content of the coal material was reduced to 0.2, the G value was reduced to 77, the caking index was 80 compared to the air-dried sample, the coal quality tended to deteriorate, and the temperature of the coal material was 93 ℃ at this time, i.e., the moisture content M of the coal material was found to be at a drying temperature of 150 ℃ctThe coal quality is controllable within the range of more than 0.2 percent and the temperature of the coal material within 93 ℃.
Example 5
The embodiment discloses a method for controlling coal quality stability in a coking coal drying process, which comprises the following steps:
1) taking wet coking coal to be dried, and measuring the caking index G of the wet coking coal080% of initial coal moisture M010.4 percent;
2) condensing the wet coking coal obtained in the step 1) into at least 20 parts of samples, taking one part of the samples to dry in the air, and placing the rest of the samples in an oven with the preset temperature of 180 ℃ to dry;
3) taking out one sample at the same time interval to measure the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is not changed and the drying is complete to obtain a table 5;
4) comparing the bond index between the sample dried in the air and the sample dried in the oven to obtain the coal moisture M with controllable coal quality stabilityctAnd coal temperature Tct；
TABLE 5 coal Property List (IV)
Figure BDA0001527701690000082
Figure BDA0001527701690000091
As can be seen from Table 5, when the test sample was dried to 11min, the moisture content of the coal material was reduced to 0.2,the G value is reduced to 77, the caking index is 80 compared with that of an air-dried sample, the coal quality has the tendency of deterioration, the temperature of the coal material is 101 ℃, and the moisture M of the coal material is known to be at the drying temperature of 180 DEG CctThe coal quality is controllable within the range of more than 0.2 percent and the temperature of the coal material within 101 ℃.
Example 6
The embodiment discloses a method for controlling coal quality stability in a coking coal drying process, which comprises the following steps:
1) taking wet coking coal to be dried, and measuring the caking index G of the wet coking coal080% of initial coal moisture M010.4 percent;
2) condensing the wet coking coal obtained in the step 1) into at least 20 parts of samples, taking one part of the samples to dry in the air, and placing the rest of the samples in an oven with the preset temperature of 200 ℃ to dry;
3) taking out one sample at the same time interval to measure the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is not changed and the drying is complete to obtain a table 6;
4) comparing the bond index between the sample dried in the air and the sample dried in the oven to obtain the coal moisture M with controllable coal quality stabilityctAnd coal temperature Tct；
TABLE 6 coal Property List (VI)
Figure BDA0001527701690000092
Figure BDA0001527701690000101
As can be seen from Table 6, when the test sample was dried for 9min, the moisture content of the coal material was reduced to 0.2, the G value was reduced to 77, the caking index was 80 compared to the air-dried sample, the coal quality tended to deteriorate, and the temperature of the coal material was 112 ℃ at this time, i.e., the moisture content M of the coal material was found to be at a drying temperature of 200 ℃ctThe coal quality is controllable within the range of more than 0.2 percent and the temperature of the coal material within 112 ℃.
Example 7
The embodiment discloses a method for controlling coal quality stability in a coking coal drying process, which comprises the following steps:
1) taking wet coking coal to be dried, and measuring the caking index G of the wet coking coal080% of initial coal moisture M010.4 percent;
2) condensing the wet coking coal obtained in the step 1) into at least 20 parts of samples, taking one part of the samples to dry in the air, and placing the rest of the samples in an oven with the preset temperature of 220 ℃ to dry;
3) taking out one sample at the same time interval, measuring the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is not changed and the drying is complete to obtain a table 7;
4) comparing the bond index between the sample dried in the air and the sample dried in the oven to obtain the coal moisture M with controllable coal quality stabilityctAnd coal temperature Tct；
TABLE 7 coal Property List (seven)
Figure BDA0001527701690000102
Figure BDA0001527701690000111
As can be seen from Table 7, when the test sample was dried for 7min, the moisture content of the coal material was reduced to 0.2, the G value was reduced to 77, the caking index was 80 compared to the air-dried sample, the coal quality tended to deteriorate, the temperature of the coal material was 117 ℃, and it was found that the moisture content M of the coal material was equal to 220 ℃ in the drying temperaturectThe coal quality is controllable at the temperature of more than 0.2 percent and the coal temperature within 117 ℃.
Example 8
The embodiment discloses a method for controlling coal quality stability in a coking coal drying process, which comprises the following steps:
1) taking wet coking coal to be dried, and measuring the cakingIndex G080% of initial coal moisture M010.4 percent;
2) condensing the wet coking coal obtained in the step 1) into at least 20 parts of samples, taking one part of the samples to be dried in the air, and drying the rest in an oven with the preset temperature of 300 ℃;
3) taking out one sample at the same time interval, measuring the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is not changed and the drying is complete to obtain a table 8;
4) comparing the bond index between the sample dried in the air and the sample dried in the oven to obtain the coal moisture M with controllable coal quality stabilityctAnd coal temperature Tct；
TABLE 8 coal Property List (8)
Figure BDA0001527701690000112
Figure BDA0001527701690000121
As can be seen from Table 8, when the test sample was dried to 3.5min, the moisture content of the coal material was reduced to 0.2, the G value was reduced to 77, the caking index was 80 compared to the air-dried sample, the coal quality tended to deteriorate, the temperature of the coal material was 130 ℃, and it was found that the moisture content M of the coal material was 130 ℃ at a drying temperature of 300 ℃ctThe coal quality is controllable within the temperature range of more than 0.2 percent and the temperature of the coal material of more than 130 ℃.
From the above examples, it can be seen that if the drying temperature is 100 ℃ or more and 120 ℃ or less, the moisture M in the coal material isctGreater than 0, coal temperature Tct≤105℃；
If the drying temperature is more than 120 ℃ and less than or equal to 300 ℃, the moisture M of the coal materialctNot less than 0.20 percent and coal temperature Tct≤130℃。
The above examples are merely preferred examples and are not intended to limit the embodiments of the present invention. In addition to the above embodiments, the present invention has other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (1)

1. A method for controlling coal quality stability in a coking coal drying process is characterized by comprising the following steps: it comprises the following steps:
1) dividing wet coking coal to be dried into a plurality of samples, drying one sample in air, and drying the rest in an oven with the preset temperature of 100-300 ℃; the bond index of the air dried sample was 80; the caking index of the wet coking coal is 80, and the moisture content is 10.1-10.4%;
2) taking out one sample at the same time interval to measure the coal quality, the coal moisture, the coal temperature and the bonding index of the sample, and stopping the test when the coal quality between two adjacent samples is kept unchanged and the drying is complete;
3) comparing the bond index between the sample dried in the air and the sample dried in the oven to obtain the coal moisture M with controllable coal quality stabilityctAnd coal temperature TctThe following mathematical relation is satisfied:
if the drying temperature is more than or equal to 100 ℃ and less than or equal to 120 ℃, the water content M of the coal material isctGreater than 0, coal temperature Tct≤105℃；
If the drying temperature is more than 120 ℃ and less than or equal to 300 ℃, the moisture M of the coal materialctNot less than 0.20 percent and coal temperature Tct≤130℃。
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