Coal blending and coking method of large-proportion long flame coal

Abstract

The invention relates to a large-proportion long flame coal blending coking method, and belongs to the technical field of coal blending coking production. Comprising the following steps: S1, burdening: preparing coal blending raw materials according to the following mass ratio: 30-40 parts of prime coking coal, 10-15 parts of 1 / 3 coking coal, 10-15 parts of lean coal, 15-22 parts of fat coal, 0-5 parts of gas-fat coal and 10-20 parts of long flame coal; s2, performing primary crushing on the long flame coal; s3, blending coal in a batching bin; s4, performing secondary crushing on the mixed materials; s5, coking: feeding the mixed coal obtained in S4 into a coal storage tower, conveying the mixed coal to a tamping, coaling and coke pushing all-in-one machine through a belt for tamping and forming, loading the mixed coal into a carbonization chamber for coking, after coke is mature, loading red coke into a dry quenching furnace for sensible heat recovery, discharging the red coke out of the dry quenching furnace, and conveying the red coke to a coke bin for storage. The proportion of the long flame coal in the large industrial coke oven is creatively and greatly increased, and the technical problems that in the prior art, the coal blending proportion of the long flame coal is low, and the coking coal blending cost is high are solved.

Description

Technical Field

[0001] The invention relates to the technical field of coal blending and coking production, in particular to a large-proportion long flame coal blending and coking method. Background Art

[0002] According to the coalification degree from low to high, coal can be divided into lignite, bituminous coal and anthracite. Conventionally, raw coal with certain cohesiveness, which can form coke under the coking conditions of chamber coke oven and is used to produce a certain quality of coke is collectively referred to as coking coal. According to the coal classification standard, 1 / 2 medium-sticky coal, gas coal, fat coal, gas-fat coal, 1 / 3 coking coal, coking coal, lean coal and lean lean coal in bituminous coal are all coking coal, while lignite, anthracite, long flame coal, non-sticky coal, weakly sticky coal and lean coal in bituminous coal are all non-coking coal.

[0003] Compared with coking coal, non-coking coal has abundant coal reserves, especially low-metamorphosis bituminous coal (long flame coal, non-sticky coal, weakly sticky coal and unclassified coal types). Long flame coal in non-coking coal has poor coking properties and cannot be used for coking alone. The proportion of coking coal is generally less than 3%. Therefore, in the existing coal blending coking process, the proportion of long flame coal is low, and the proportion of other coal types is high, resulting in high cost of the current coal blending coking process. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a large proportion of long flame coal blending method for coking. The technical solution of the present invention is as follows:

[0005] A large proportion long flame coal blending coking method, comprising:

[0006] S1, batching: prepare the coal blending raw materials according to the following mass ratio: 30-40 parts of main coking coal, 10-15 parts of 1 / 3 coking coal, 10-15 parts of lean coal, 15-22 parts of fat coal, 0-5 parts of gas fat coal, and 10-20 parts of long flame coal;

[0007] S2, primary crushing of long flame coal: use a crusher to perform primary crushing on the long flame coal, so that the content of the long flame coal with a fineness less than 3mm after primary crushing reaches more than 80%, and the content of the long flame coal with a fineness greater than 5mm is ≤5%;

[0008] S3, coal batching in batching bin: the crushed long flame coal is combined with main coking coal, 1 / 3 coking coal, lean coal, fat coal and gas fat coal on the belt conveyor and sent to the pulverizer room;

[0009] S4, secondary crushing of mixed materials: the mixed materials obtained in S3 are subjected to secondary crushing by a crusher, so that the content of the mixed coal with a fineness of less than 3 mm obtained after the secondary crushing reaches more than 88%, the content of the fineness of less than 0.5 mm is ≤55%, and the content of the fineness of more than 5 mm is ≤5%;

[0010] S5, coking: the blended coal obtained in S4 is sent to the coal storage tower, conveyed by belt to the integrated tamping coal loading and coke pushing machine for tamping and forming, and then loaded into the carbonization chamber for coking. After the coke is mature, the integrated tamping coal loading and coke pushing machine is used to push the red coke into the circular rotary coke tank, and the red coke is loaded into the dry quenching furnace for sensible heat recovery, then discharged from the dry quenching furnace and transported to the coke bin for storage.

[0011] Optionally, during the coking process in the carbonization chamber, the parameters are controlled as follows: coking time is 26.5h, standard temperature is 1350℃, center temperature of coke cake is 1000±50℃, bottom pressure of carbonization chamber at the end of coking is ≥5Pa, straight temperature uniformity coefficient during the day and night in the coke oven operating level is ≥0.95, temperature stability coefficient is ≥0.95, cross wall temperature coefficient is ≥0.95, furnace head temperature coefficient is ≥0.95, and total coke pushing coefficient is ≥0.9.

[0012] Optionally, in S5, the red coke is loaded into a dry quenching furnace for sensible heat recovery, comprising:

[0013] The red coke at a temperature of 1000±50℃ is subjected to reverse heat exchange with the circulating gas in the dry quenching furnace to cool the red coke to below 200℃.

[0014] Optionally, before S1, the step also includes: S6, performing industrial analysis and coal rock analysis on each type of coal in a laboratory.

[0015] Optionally, the industrial analysis indicators of the long flame coal are as follows: ash content is 4%, volatile content is 38.5%, sulfur content is 0.4%, and caking index is 10-15;

[0016] The coal petrographic characteristics of the long flame coal are as follows: the maximum random reflectivity is 0.586%, the standard deviation is 0.045, the coefficient of variation is 0.081%, and it belongs to a single coal type.

[0017] Optionally, before S1, the step also includes: S7, conducting a coking test on a single type of coal using a small coke oven.

[0018] Optionally, before S1, the step further includes: S8, conducting a compatibility test on the long flame coal and the fat coal.

[0019] Optionally, before S1, the step also includes: S9, conducting a coal blending test using a small coke oven.

[0020] Optionally, before S2, the step further includes: sucking out iron pieces mixed in the long flame coal by an iron removal device.

[0021] All the above optional technical solutions can be combined arbitrarily, and the present invention does not provide detailed descriptions of the structures after the combinations.

[0022] By means of the above scheme, the beneficial effects of the present invention are as follows:

[0023] By utilizing the method provided in the embodiment of the present invention, the proportion of long flame coal in industrial large coke ovens is innovatively greatly increased, solving the technical problems of low proportion of long flame coal and high cost of coking coal in the prior art.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a flow chart of a large proportion long flame coal blending coking method provided by an embodiment of the present invention.

[0026] Figure 2 is a random reflectivity distribution diagram of long flame coal in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] like Figure 1 As shown, the large-proportion long flame coal blending method for coking provided by the embodiment of the present invention comprises the following steps:

[0029] S1. Batching: prepare the coal blending raw materials according to the following mass ratio: 30-40 parts of main coking coal, 10-15 parts of 1 / 3 coking coal, 10-15 parts of lean coal, 15-22 parts of fat coal, 0-5 parts of gas fat coal, and 10-20 parts of long flame coal.

[0030] S2, primary crushing of long flame coal: use a crusher to perform primary crushing on the long flame coal, so that the content of the long flame coal with a fineness less than 3mm after the primary crushing reaches more than 80%, and the content of the long flame coal with a fineness greater than 5mm is ≤5%.

[0031] Specifically, this step can be achieved by using a PFG1416 high-efficiency compound crusher.

[0032] S3, coal batching in batching bin: the crushed long flame coal is combined with main coking coal, 1 / 3 coking coal, lean coal, fat coal and gas fat coal on the belt conveyor and sent to the pulverizer room.

[0033] S4, secondary crushing of the mixture: the mixture obtained in S3 is subjected to secondary crushing by a crusher, so that the content of the blended coal with a fineness of less than 3 mm obtained after the secondary crushing reaches more than 88%, the content of the fineness of less than 0.5 mm is ≤55%, and the content of the fineness of greater than 5 mm is ≤5%.

[0034] S5, Coking: The blended coal obtained in S4 is sent to the coal storage tower, conveyed by a belt to a stamping coal charging and coke pushing integrated machine for stamping and forming, then charged into the carbonization chamber for coking. After the coke is matured, the red-hot coke is pushed into a circular rotary coke pot by the stamping coal charging and coke pushing integrated machine. After the sensible heat of the red-hot coke is recovered in a dry quenching furnace, it is discharged from the dry quenching furnace and transported to the coke bin for storage.

[0035] Specifically, during the coking process in the carbonization chamber, the following parameters are controlled: the coking time is 26.5 h, the standard temperature is 1350 °C, the center temperature of the coke cake is 1000 ± 5 °C, the bottom pressure of the carbonization chamber at the end of coking is ≥ 5 Pa, and the straight-line temperature day-night uniformity coefficient in the coke oven operation level is ≥ 0.95, the temperature stability coefficient (K_security) is ≥ 0.95, the cross-wall temperature coefficient (K_cross-wall) is ≥ 0.95, the furnace head temperature coefficient (K_furnace head) is ≥ 0.95, and the total coke pushing coefficient (K3) is ≥ 0.9.

[0036] Specifically, the process of charging the red-hot coke into the dry quenching furnace for sensible heat recovery in S5 includes: the red-hot coke at a temperature of 1000 ± 5 °C exchanges heat with the circulating gas in the dry quenching furnace in a countercurrent manner, cooling the red-hot coke to below 200 °C.

[0037] In another embodiment, before S1, it further includes: S6, conducting proximate analysis and maceral analysis on each coal type in the laboratory.

[0038] Through the proximate analysis and maceral analysis of long-flame coal, the following proximate analysis indexes of long-flame coal are obtained: ash content (Ad) is 4%, volatile matter (Vdaf) is 38.5%, sulfur content (St.d) is 0.4%, and caking index (G) is 10 - 15; the maceral characteristics of long-flame coal are as follows: the maximum random reflectance is 0.586%, the standard deviation is 0.045, and the coefficient of variation is 0.081%, belonging to a single coal type. The random reflectance distribution of long-flame coal Figure 2 is shown. The calculation results of the random reflectance interval of long-flame coal are shown in Table 1.

[0039] Table 1

[0040] scope / % 0～0.47 0.47～0.58 0.58～0.65 percentage / % 1.7 70.5 27.8 Coal lignite Long flame coal gas coal

[0041] In another embodiment, before S1, it further includes: S7, conducting coking property tests on single coals using a small coke oven, and conducting compatibility tests on long-flame coal and fat coal.

[0042] Specifically, the coking property and compatibility test data of long-flame coal and fat coal as single coals are shown in Table 2.

[0043] Table 2

[0044]

[0045] The embodiment of the present invention conducts a small coke oven compatibility test on the non-coking long flame coal and the strong coking fat coal, and determines that the space for reducing the thermal strength of coke is small, and the thermal strength of coke after matching is close to 60%. Therefore, it is determined that it is possible to boldly try to adjust the ratio to conduct coal blending test research. Because, in the process of coal blending and coking, the coal with the best coking property and the coal with the worst coking property can meet the coke quality requirements, and the other medium-sized coals with coking properties can interact with each other to ensure the qualified coke quality.

[0046] In another embodiment, before S1, the step further includes: S9, using a small coke oven to conduct a coal blending test, wherein the specific blending ratio adopts the blending ratio provided in the embodiment of the present invention. As shown in Table 3, it is a schematic table of the results of the coal blending test using a small coke oven.

[0047] Table 3

[0048] Ash content Ad% Volatile matter Vdaf% Sulfur content St.d% CRI CSR <13.0 <1.5 <0.7 <30 >60

[0049] In another embodiment, before S2, the step further includes: using an iron removal device to suck out iron pieces mixed in the long flame coal to avoid the iron pieces from affecting subsequent processes.

[0050] To demonstrate the feasibility of the method provided in the embodiment of the present invention, two comparative examples and an embodiment are provided below.

[0051] Comparative Example 1:

[0052] The coal blending coking method provided in this comparative example comprises the following steps:

[0053] 1) Ingredients: 41 parts of main coking coal, 10 parts of 1 / 3 coking coal, 12 parts of lean coal, 15 parts of fat coal, 17 parts of gas coal, and 5 parts of long flame coal. The ratio is by mass.

[0054] 2) Primary crushing of long flame coal: Use a crusher to crush the long flame coal, so that the content of the long flame coal with a fineness less than 3mm after the primary crushing reaches more than 80%, and the content of the long flame coal with a fineness greater than 5mm is ≤5%;

[0055] 3) Coal batching in batching bin: The crushed long flame coal is combined with main coking coal, 1 / 3 coking coal, lean coal, fat coal and gas coal on the belt conveyor and sent to the pulverizer room;

[0056] 4) Secondary crushing of the mixed material: The mixed material obtained in step 3) is subjected to secondary crushing by a crusher, so that the content of the blended coal with a fineness of less than 3 mm obtained after the secondary crushing reaches more than 88%, the content of the blended coal with a fineness of less than 0.5 mm is ≤55%, and the content of the blended coal with a fineness of greater than 5 mm is ≤5%;

[0057] 5) Coking: The blended coal obtained in step 4) is fed into a coal storage tower, conveyed by a belt to a tamping coal-loading and coke-pushing integrated machine for tamping and forming, and then fed into a carbonization chamber for coking. After the coke is mature, the tamping coal-loading and coke-pushing integrated machine is used to push the red coke into a circular rotary coke tank, and the red coke is fed into a dry quenching furnace for sensible heat recovery, then discharged from the dry quenching furnace, and transported to a coke bin for storage.

[0058] The quality of coke prepared in Comparative Example 1 is shown in Table 4.

[0059] Table 4

[0060] Ash content Ad% Volatile matter Vdaf% Sulfur content St.d% <![CDATA[M 25 ]]> <![CDATA[M 10 ]]> CRI CSR <13.0 <1.5 <0.7 >92 <7 <30 >60

[0061] Comparative Example 2:

[0062] The coal blending coking method provided in this comparative example comprises the following steps:

[0063] 1) Ingredients: 33 parts of main coking coal, 10 parts of 1 / 3 coking coal, 10 parts of lean coal, 22 parts of fat coal, 10 parts of gas coal, and 15 parts of long flame coal. The ratio is by mass.

[0064] 2) Primary crushing of long flame coal: Use a crusher to crush the long flame coal, so that the content of the long flame coal with a fineness less than 3mm after the primary crushing reaches more than 80%, and the content of the long flame coal with a fineness greater than 5mm is ≤5%;

[0065] 3) Coal batching in batching bin: The crushed long flame coal is combined with main coking coal, 1 / 3 coking coal, lean coal, fat coal and gas coal on the belt conveyor and sent to the pulverizer room;

[0066] 4) Secondary crushing of the mixed material: The mixed material obtained in step 3) is subjected to secondary crushing by a crusher, so that the content of the blended coal with a fineness of less than 3 mm obtained after the secondary crushing reaches more than 88%, the content of the blended coal with a fineness of less than 0.5 mm is ≤55%, and the content of the blended coal with a fineness of greater than 5 mm is ≤5%;

[0067] 5) Coking: The blended coal obtained in step 4) is fed into a coal storage tower, conveyed by a belt to a tamping coal-loading and coke-pushing integrated machine for tamping and forming, and then fed into a carbonization chamber for coking. After the coke is mature, the tamping coal-loading and coke-pushing integrated machine is used to push the red coke into a circular rotary coke tank, and the red coke is fed into a dry quenching furnace for sensible heat recovery, then discharged from the dry quenching furnace, and transported to a coke bin for storage.

[0068] The quality of coke prepared in Comparative Example 2 is shown in Table 5.

[0069] Table 5

[0070] Ash content Ad% Volatile matter Vdaf% Sulfur content St.d% <![CDATA[M 25 ]]> <![CDATA[M 10 ]]> CRI CSR <13.0 <1.5 <0.7 >92 <7 <30 >60

[0071] Example:

[0072] The coal blending and coking method provided in this embodiment comprises the following steps:

[0073] 1) Ingredients: 30 parts of main coking coal, 15 parts of 1 / 3 coking coal, 10 parts of lean coal, 20 parts of fat coal, 5 parts of gas fat coal, and 20 parts of long flame coal. The ratio is by mass.

[0074] 2) Primary crushing of long flame coal: Use a crusher to crush the long flame coal, so that the content of the long flame coal with a fineness less than 3mm after the primary crushing reaches more than 80%, and the content of the long flame coal with a fineness greater than 5mm is ≤5%;

[0075] 3) Coal batching in batching bin: The crushed long flame coal is combined with main coking coal, 1 / 3 coking coal, lean coal, fat coal and gas fat coal on the belt conveyor and sent to the pulverizer room;

[0076] 4) Secondary crushing of the mixed material: The mixed material obtained in step 3) is subjected to secondary crushing by a crusher, so that the content of the blended coal with a fineness of less than 3 mm obtained after the secondary crushing reaches more than 88%, the content of the blended coal with a fineness of less than 0.5 mm is ≤55%, and the content of the blended coal with a fineness of greater than 5 mm is ≤5%;

[0077] 5) Coking: The blended coal obtained in step 4) is fed into a coal storage tower, conveyed by a belt to a tamping coal-loading and coke-pushing integrated machine for tamping and forming, and then fed into a carbonization chamber for coking. After the coke is mature, the tamping coal-loading and coke-pushing integrated machine is used to push the red coke into a circular rotary coke tank, and the red coke is fed into a dry quenching furnace for sensible heat recovery, then discharged from the dry quenching furnace, and transported to a coke bin for storage.

[0078] The quality of coke prepared in the examples is shown in Table 6.

[0079] Table 6

[0080] Ash content Ad% Volatile matter Vdaf% Sulfur content St.d% <![CDATA[M 25 ]]> <![CDATA[M 10 ]]> CRI CSR <13.0 <1.5 <0.7 >92 <7 <30 >60

[0081] Comparing Comparative Examples 1 and 2 with the methods provided in the examples, it can be seen that the quality of coke prepared by the preparation method described in the above examples is the same as that of Comparative Examples 1 and 2 after increasing the proportion of long flame coal in the present invention.

[0082] Through continuous research, the applicant of the present invention has successfully achieved large-proportion long flame coal blending for coking, and the proportion of long flame coal used in the current production process has reached 15-20%; at the same time, by implementing the large-proportion long flame coal blending for coking method, the company's coking cost has been reduced by 20-30 yuan / ton, and the clean coal consumption per ton of coke is 1.31 tons, which is lower than the average clean coal consumption per ton of coke of general coking enterprises.

[0083] In summary, the method provided by the embodiment of the present invention innovatively increases the proportion of long flame coal in industrial large coke ovens to 20%. The present invention solves the technical problems of low proportion of long flame coal and high cost of coking coal in the prior art. The cost of coal blending can be reduced by 20 to 30 yuan per ton of dry coal. Calculated based on a coking rate of 75%, the cost of coke per ton can be reduced by about 27 to 40 yuan.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for coking with large proportion of long flame coal, characterized in that: include: S1, batching: prepare the coal blending raw materials according to the following mass ratio: 30-40 parts of main coking coal, 10-15 parts of 1 / 3 coking coal, 10-15 parts of lean coal, 15-22 parts of fat coal, 0-5 parts of gas fat coal, and 10-20 parts of long flame coal; S2, primary crushing of long flame coal: use a crusher to perform primary crushing on the long flame coal, so that the content of the long flame coal with a fineness less than 3mm after primary crushing reaches more than 80%, and the content of the long flame coal with a fineness greater than 5mm is ≤5%; S3, coal batching in batching bin: the crushed long flame coal is combined with main coking coal, 1 / 3 coking coal, lean coal, fat coal and gas fat coal on the belt conveyor and sent to the pulverizer room; S4, secondary crushing of mixed materials: the mixed materials obtained in S3 are subjected to secondary crushing by a crusher, so that the content of the mixed coal with a fineness of less than 3 mm obtained after the secondary crushing reaches more than 88%, the content of the fineness of less than 0.5 mm is ≤55%, and the content of the fineness of more than 5 mm is ≤5%; S5, coking: the blended coal obtained in S4 is sent to the coal storage tower, conveyed by belt to the integrated tamping coal loading and coke pushing machine for tamping and forming, and then loaded into the carbonization chamber for coking. After the coke is mature, the integrated tamping coal loading and coke pushing machine is used to push the red coke into the circular rotary coke tank, and the red coke is loaded into the dry quenching furnace for sensible heat recovery, then discharged from the dry quenching furnace and transported to the coke bin for storage.

2. The method for coking with large proportion long flame coal blending according to claim 1, characterized in that: During the coking process in the carbonization chamber, the controlled parameters are as follows: coking time is 26.5h, standard temperature is 1350℃, center temperature of coke cake is 1000±50℃, bottom pressure of carbonization chamber at the end of coking is ≥5Pa, day and night uniformity coefficient of straight temperature in the coke oven operating level is ≥0.95, temperature stability coefficient is ≥0.95, cross wall temperature coefficient is ≥0.95, furnace head temperature coefficient is ≥0.95, and total coke pushing coefficient is ≥0.

9.

3. The large proportion long flame coal blending coking method according to claim 1 or 2, characterized in that: In S5, the red coke is loaded into a dry quenching furnace for sensible heat recovery, including: The red coke at a temperature of 1000±50℃ is subjected to reverse heat exchange with the circulating gas in the dry quenching furnace to cool the red coke to below 200℃.

4. The large proportion long flame coal blending coking method according to claim 1 is characterized in that: Before S1, it also includes: S6, conducting industrial analysis and coal rock analysis on various types of coal in the laboratory.

5. The method for coking with large proportion long flame coal blending according to claim 4, characterized in that: The industrial analysis indicators of the long flame coal are as follows: ash content is 4%, volatile content is 38.5%, sulfur content is 0.4%, and caking index is 10-15; The coal petrographic characteristics of the long flame coal are as follows: the maximum random reflectivity is 0.586%, the standard deviation is 0.045, the coefficient of variation is 0.081%, and it belongs to a single coal type.

6. The large proportion long flame coal blending coking method according to claim 1, characterized in that: The step before S1 also includes: S7, using a small coke oven to conduct a coking test on a single type of coal.

7. The method for coking with large proportion long flame coal blending according to claim 1, characterized in that: The step before S1 also includes: S8, conducting a compatibility test on the long flame coal and the fat coal.

8. The method for coking with large proportion long flame coal blending according to claim 1, characterized in that: The step before S1 also includes: S9, conducting a coal blending test using a small coke oven.

9. The large proportion long flame coal blending coking method according to claim 1, characterized in that: The step before S2 also includes: sucking out the iron pieces mixed in the long flame coal by an iron removal device.

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