CN114345532B - Coal making system and process - Google Patents
Coal making system and process Download PDFInfo
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- CN114345532B CN114345532B CN202210009445.0A CN202210009445A CN114345532B CN 114345532 B CN114345532 B CN 114345532B CN 202210009445 A CN202210009445 A CN 202210009445A CN 114345532 B CN114345532 B CN 114345532B
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Abstract
The embodiment of the invention provides a coal preparation system and a process, and relates to the field of coking and coal blending. Aims to alleviate the problem of fluctuation of quality of the matched coal. The coal making system comprises a main belt, at least one first coal blending hopper, at least one sub-belt and at least one sub-metering scale, wherein the at least one first coal blending hopper is arranged above the main belt; the at least one sub-belt is arranged between the at least one first coal blending hopper and the main belt, each sub-belt corresponds to one first coal blending hopper, and the sub-belt is used for conveying raw coal distributed by the first coal blending hopper to the main belt; at least one sub-meter is disposed on the sub-belt, and each sub-meter corresponds to one sub-belt. A coal making process is used for a coal making system. The first coal distribution hopper firstly feeds the material to the belt separation belt, then feeds the material to the main belt, the belt separation belt is provided with a metering scale, the metering scale is independently used for metering, the feeding fluctuation of the first coal distribution hopper only affects the metering of the first coal distribution hopper without affecting the feeding metering of other positions of the main belt, and the mutual influence of fluctuation is reduced.
Description
Technical Field
The invention relates to the field of coking and coal blending, in particular to a coal making system and a coal making process.
Background
Coal shuffling becomes more and more serious with current market changes and coming market. Meanwhile, in order to further reduce the coal blending cost, various large coking enterprises are continuously expanding purchasing channels, so that the coal mining sites are more and suppliers are unstable. In order to cope with the fluctuation of market raw materials, each large coking enterprise subdivides coal types so as to relieve the influence caused by the fluctuation of raw material quality. However, due to the limitation of the coal storage capacity and the design quantity of the coal blending tanks, the subdivision of coal types is limited. Meanwhile, the quality difference between different mining points of the same coal type is large, so that great difficulty is brought to each large coking enterprise in coal blending, and the quality fluctuation of the coal blending is frequent.
Disclosure of Invention
Objects of the present invention include, for example, providing a coal making system that alleviates the problem of fluctuation in quality of the blended coal.
The invention also aims to provide a coal preparation process which can alleviate the problem of fluctuation of quality of the matched coal.
Embodiments of the invention may be implemented as follows:
the embodiment of the invention provides a coal making system, which comprises a main belt; at least one first coal blending hopper, the at least one first coal blending hopper being disposed above the main belt;
the at least one sub-belt is arranged between the at least one first coal blending hopper and the main belt, each sub-belt corresponds to one first coal blending hopper, and the sub-belt is used for conveying raw coal distributed by the first coal blending hopper to the main belt;
and the at least one sub-metering scale is arranged on the sub-belt, each sub-metering scale corresponds to one sub-belt, and the sub-metering scale is used for metering raw coal on the sub-belt.
In addition, the coal making system provided by the embodiment of the invention can also have the following additional technical characteristics:
optionally, the coal making system further comprises at least one second coal blending hopper and at least one main metering scale;
the at least one second coal blending hopper and the at least one first coal blending hopper are arranged above the main belt at intervals;
the at least one main weighing scale is arranged on the main belt, and each main weighing scale corresponds to one second coal blending hopper; the main metering scale is used for metering raw coal distributed on the main belt by the second coal blending hopper.
Optionally, the at least one second coal blending hopper and the at least one first coal blending hopper are sequentially arranged at intervals along the forward conveying direction of the main belt, and the first coal blending hopper is close to the tail end of the main belt relative to the second coal blending hopper.
Optionally, the at least one sub belt includes a first sub belt and a second sub belt spaced apart in a forward direction of the main belt conveyance; the first sub-belt is used for conveying raw material coal to the main belt, and the conveying proportion is 10-20%; the second sub belt is used for conveying raw material coal to the main belt, and the conveying proportion is 3-8%.
Optionally, the number of the main belts is at least one;
at least one main belt comprises a first main belt and a second main belt which are arranged side by side at intervals, wherein the first main belt is used for conveying raw coal to a crusher, and the conveying proportioning range is 40% -60%; the second main belt is used for conveying raw coal to the crusher, and the conveying proportion range is 40% -60%.
Optionally, the coal making system further comprises a controller, at least one first blanking machine and at least one first air cannon; each first coal blending hopper is arranged on one first blanking machine, and each first air cannon is arranged on one first blanking machine;
the first air cannon, the sub-metering scale and the first blanking machine are all communicated with the controller, and the controller is used for acquiring a first signal which is output by the sub-metering scale and represents the actual quality of raw material coal on the sub-belt and adjusting the batching speed of the first blanking machine under the condition that the actual quality is smaller than a set quality; the controller is also used for controlling the first air cannon to start under the condition that the actual mass is still smaller than the set mass after the preset period of time is adjusted on the batching speed of the first blanking machine.
Optionally, the coal making system further comprises at least one second blanking machine and at least one second air cannon; each second coal blending hopper is arranged on one second blanking machine, and each second air cannon is arranged on one second blanking machine; the second air cannon, the main metering scale and the second blanking machine are communicated with the controller;
the controller is used for obtaining a second signal which is output by the main metering scale and represents the actual quality of raw material coal of the main belt, the controller is further used for obtaining the actual proportioning of each raw material coal according to the first signal or the second signal, and the controller is further used for controlling the first blanking machine or the second blanking machine to stop under the condition that the actual proportioning is larger than or smaller than a planned proportioning.
Optionally, the coal making system further comprises a pre-crushing belt, a screening machine, a crusher, an undersize belt, a post-crushing belt and a converging belt;
the crushing front belt is used for conveying raw coal to the screening machine, the screening machine is used for screening the raw coal into an upper screen part and a lower screen part, the crushing machine is used for crushing the upper screen part, the crushed belt is used for receiving the crushed upper screen part and conveying the crushed upper screen part to the converging belt, the lower screen belt is used for receiving the lower screen part and conveying the converging belt, and the converging belt is used for conveying the converging raw coal to the coal tower.
The embodiment of the invention also provides a coal making process, which is used for a coal making system and comprises the following steps:
the raw material coal distributed by the first coal blending hopper is conveyed to a main belt by utilizing a distribution belt;
and metering the raw material coal on the belt by using a sub-metering scale.
Optionally, the at least one sub-belt includes a first sub-belt and a second sub-belt that are disposed at intervals along the forward direction of the main belt, and the step of conveying the raw coal dispensed from the first coal hopper to the main belt by using the sub-belts includes:
the ratio of the raw material coal conveyed by the first sub-belt to the main belt is 10-20%; the proportion of the raw material coal conveyed by the second sub belt to the main belt is 3-8%.
The coal making system and the coal making process have the beneficial effects that:
the coal making system comprises a main belt, at least one first coal blending hopper, at least one sub-belt and at least one sub-metering scale, wherein the at least one first coal blending hopper is arranged above the main belt; the at least one sub-belt is arranged between the at least one first coal blending hopper and the main belt, each sub-belt corresponds to one first coal blending hopper, and the sub-belt is used for conveying raw coal distributed by the first coal blending hopper to the main belt; at least one sub-meter is disposed on the sub-belt, and each sub-meter corresponds to one sub-belt.
The first coal distributing hopper firstly feeds onto the dividing belt, then feeds onto the main belt by the dividing belt, and is conveyed to subsequent equipment by the main belt. The weighing scale is arranged on the dividing belt, and the weighing of the first coal distribution hopper is separated from the weighing of the main belt, so that the weighing of the first coal distribution hopper only affects the weighing of the first coal distribution hopper and does not affect the weighing of the main belt at other positions, the fluctuation influence of the weighing can be reduced, the fluctuation problem of the quality of the matched coal is relieved, the coal distribution accuracy is obviously improved, and the coal distribution quality is stabilized.
The coal preparation process is used for the coal preparation system, and can relieve the problem of fluctuation of quality of the matched coal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a coal blending part of a coal making system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an air cannon control portion of a coal-making system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a coal making system according to an embodiment of the present invention;
FIG. 4 is a schematic view of a structure of a crushing portion of a coal making system according to a second view angle of the present invention;
fig. 5 is a schematic structural view of a third view of a crushing portion of a coal making system according to an embodiment of the present invention.
Icon: 10-a coal preparation system; 100-a first coal blending hopper; 200-a first sub-belt; 201-a second split belt; 210-minute metering; 300-a second coal blending hopper; 400-a first main belt; 401-a second main belt; 410-master metering scale; 500-crushing a front belt; 510-sieving machine; 520-crusher; 530-undersize belt; 540-crushed belt; 550-converging belts; 600-original belt before crushing; 610-original crusher; 620-original crushed belt; 700-control computer; 710-a PLC control system; 720-an air cannon; 730-a disk feeder; 740-a meter.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The coal making system 10 provided in this embodiment is described in detail below with reference to fig. 1 to 5.
Referring to fig. 1, an embodiment of the present invention provides a coal making system 10, including a main belt, at least one first coal hopper 100, at least one sub-belt, and at least one sub-scale 210; at least one first coal hopper 100 is disposed above the main belt; at least one sub-belt is arranged between at least one first coal distribution hopper 100 and the main belt, and each sub-belt corresponds to one first coal distribution hopper 100 and is used for conveying raw coal distributed by the first coal distribution hopper 100 to the main belt; at least one sub-meter 210 is disposed on the sub-belt, and each sub-meter 210 corresponds to one sub-belt, and the sub-meter 210 is configured to meter the raw coal on the sub-belt.
The metering system of the main belt adopts a differential method, and the front blanking fluctuation generally affects the rear blanking, so that the metering of the rear metering scale can be ensured to reach the set requirement.
In this embodiment, the first coal blending hopper 100 is fed onto the dividing belt, then fed onto the main belt by the dividing belt, and the main belt uniformly conveys the raw coal with various proportions to the subsequent equipment. The sub-metering scale 210 is arranged on the sub-belt, the position of the main belt corresponding to the first coal blending hopper 100 is not provided with the metering scale, the sub-metering scale 210 separately meters the blanking of the first coal blending hopper 100, the influence of the fluctuation of the quality of other blanking on the main belt is avoided, the follow-up other blanking on the main belt is not influenced, namely, the blanking of the first coal blending hopper 100 only influences the metering of the main belt, so that the influence of the fluctuation of the quality of the matched coal can be reduced, the problem of the fluctuation of the quality of the matched coal is relieved, and the accuracy of the matched coal and the quality of the matched coal are remarkably improved.
Wherein "at least one" includes one, two or more. For example, the number of the first coal hoppers 100 is plural, the number of the sub-belts and the sub-metering amounts corresponds to the number of the first coal hoppers 100, the number of the sub-belts is plural, the number of the sub-metering amounts 210 is plural, the plurality of the first coal hoppers 100 are sequentially arranged at intervals along the conveying direction of the main belt, the plurality of sub-belts are arranged in one-to-one correspondence with the plurality of the first coal hoppers 100, and the plurality of the sub-metering amounts 210 are arranged in one-to-one correspondence with the plurality of sub-belts. The number of the first coal blending hoppers 100 is set according to actual needs.
Referring to fig. 1, in the present embodiment, the coal making system 10 further includes at least one second coal blending hopper 300 and at least one main scale 410; at least one second coal hopper 300 and at least one first coal hopper 100 are spaced above the main belt; at least one main scale 410 is disposed on the main belt, and each main scale 410 corresponds to one second coal hopper 300; the main meter 410 is used for metering raw coal that the second coal blending hopper 300 is blended onto the main belt.
The second coal blending hopper 300 is directly fed onto the main belt, and a main metering scale 410 is arranged at the position of the main belt corresponding to the second coal blending hopper 300, and the main metering scale 410 meters the feeding of the second coal blending hopper 300. The first and second coal hoppers 100 and 300 are sequentially disposed at intervals along the conveying direction of the main belt, and the order of the first and second coal hoppers 100 and 300 is not limited.
The number of the second coal blending hoppers 300 is set according to the requirements. The number of the main weighing scales 410 corresponds to the number of the second coal blending hoppers 300, for example, the number of the second coal blending hoppers 300 is multiple, the number of the main weighing scales 410 is multiple, the second coal blending hoppers 300 are arranged at intervals along the conveying direction of the main belt, the main weighing scales 410 are arranged on the main belt at intervals, and the plurality of main weighing scales 410 are arranged in one-to-one correspondence with the plurality of second coal blending hoppers 300.
With continued reference to fig. 1, in this embodiment, considering that the layout is compact, the configuration of the coal blending hoppers should be arranged in a single row or a double row according to the scale and the number of the factories, if the number of the coal blending hoppers is less than 8, the configuration should be arranged in a single row, and if the number is more than 10, the configuration should be arranged in a double row. In this embodiment, a total of 12 coal hoppers are provided, the number of the first coal hoppers 100 is four, the number of the second coal hoppers 300 is eight, and the two rows are adopted, so that the number of the corresponding lower main belts is two. The coal storage amount of the single coal blending hopper is 500 tons.
Referring to fig. 1, in the present embodiment, at least one second coal blending hopper 300 and at least one first coal blending hopper 100 are sequentially arranged at intervals along the forward direction of the main belt, and the first coal blending hopper 100 is close to the end of the main belt relative to the second coal blending hopper 300.
Referring to the relative positions in fig. 1, the "forward direction of main belt conveyance" refers to the direction indicated by arrow a in fig. 1.
Specifically, one main belt is provided with four second coal hoppers 300 and two first coal hoppers 100. Four second coal hoppers 300 and two first coal hoppers 100 are arranged at intervals in sequence along the left-to-right direction, and two first coal hoppers 100 are arranged at the tail ends of the main belt.
The main belt metering system adopts differential method, and the front blanking fluctuation generally affects the rear blanking. Two first coal blending hoppers 100 are arranged at the tail end of the main belt, then the second coal blending hoppers 300 adjacent to the first coal blending hoppers 100 and the discharging fluctuation of the two first coal blending hoppers 100 (namely, three coal blending hoppers from right to left in fig. 1) only affect the metering of the two first coal blending hoppers 100 and do not affect the metering of other hoppers, in daily operation, the coal types with difficult coal discharging can be arranged in the three coal blending hoppers at the tail end, the condition of discharging fluctuation can be improved, and the coal blending accuracy is improved. The tail ends of the two main belts are provided with the two first coal distribution hoppers 100, so that the fluctuation of the total six coal distribution hoppers can not influence the discharging fluctuation of other hoppers, the cost can be reduced, and the effect of relieving the quality fluctuation is very remarkable.
Referring to fig. 1, in the present embodiment, at least one sub-belt includes a first sub-belt 200 and a second sub-belt 201 spaced apart in a main belt conveying forward direction; the first sub belt 200 is used for conveying raw coal to the main belt, and the conveying proportion is 10-20%; the second sub belt 201 is used for conveying raw coal to the main belt, and the conveying proportion is 3-8%.
For example, the first sub-belt 200 may be 10%, 15%, 18%, 20% in proportion. The proportion of the second belt 201 can be 3%, 5%, 6% and 8%.
The first sub-belt 200 and the second sub-belt 201 are positioned at the end of the main belt and are spaced apart from each other from left to right, as described with respect to the relative positions of fig. 1.
The first sub belt 200 is set to be large in proportion, the second sub belt 201 is set to be small in proportion, and therefore the influence of quality fluctuation can be effectively reduced when the coal is fed with coal which is difficult to feed. The coal blending precision reaches more than 99 percent.
Referring to fig. 1, in the present embodiment, the number of main belts is at least one; at least one main belt comprises a first main belt 400 and a second main belt 401 which are arranged side by side at intervals, wherein the first main belt 400 is used for conveying raw coal to a crusher (not shown in fig. 1), and the conveying proportion range is 40% -60%; the second main belt 401 is used for conveying raw coal to the crusher 520, and the conveying proportion range is 40% -60%.
For example, the first main belt 400 may be 40%, 45%, 50%, 60% in the ratio. The first main belt 400 may be 40%, 45%, 50%, 60% in the ratio.
The setting number of the main belts is set according to the number of the coal blending hoppers. The conveying proportioning range of each main belt is about ten percent of the total proportioning/main belt quantity floating up and down, so that the proportioning balance of each main belt is ensured. Therefore, belt coal throwing caused by excessive blanking in the blanking machine adjusting process during the fluctuation of the blanking can be reduced, belt deviation is reduced, the accuracy of the weighing scale is improved, and meanwhile, the coal throwing phenomenon caused by the converging belt 550 can be reduced.
For example, in the present embodiment, the number of main belts is two, namely, the first main belt 400 and the second main belt 401, and the first main belt 400 and the second main belt 401 are arranged side by side at intervals. Each main belt is provided with gas coal, fat coal, coking coal, lean coal and 1/3 coking coal, and different coal types are arranged in a matching way according to the sulfur division index. The first main belt 400 has a lower limit of 40% and an upper limit of 60% to ensure balance of the two belts.
Referring to fig. 1 and 2, in the present embodiment, the coal-making system 10 further includes a controller, at least one first blanking machine, and at least one first air cannon; each first coal blending hopper 100 is arranged on one first blanking machine, and each first air cannon is arranged on one first blanking machine; the first air cannon, the sub-metering scale 210 and the first blanking machine are all communicated with a controller, and the controller is used for acquiring a first signal which is output by the sub-metering scale 210 and represents the actual quality of raw material coal on a sub-belt, and adjusting the batching speed of the first blanking machine under the condition that the actual quality is smaller than the set quality; the controller is also used for controlling the first air cannon to start under the condition that the actual mass is still smaller than the set mass after the preset period of time is regulated on the batching speed of the first blanking machine.
Each first coal blending hopper 100 is correspondingly provided with a first blanking machine, and similarly, each second coal blending hopper 300 is correspondingly provided with a second blanking machine. Each first blanking machine is provided with a first air cannon, and each second blanking machine is correspondingly provided with a second air cannon. Wherein, the first blanking machine and the second blanking machine both adopt a disc feeder 730.
The sub-metering scale 210 is used for metering the coal discharge amount of the first coal blending hopper 100 and outputting a first signal representing the actual quality, and the controller receives the first signal and controls the first blanking machine and the first air cannon according to the first signal. Specifically, when the actual mass is smaller than the set mass (ten percent of the preset coal amount), the controller controls the first blanking machine to regulate the speed, and the feeding speed of the first blanking machine is improved. When the feeding speed of the first blanking machine cannot meet the requirement of the coal discharging amount after the speed of the first blanking machine is continuously regulated for 5min, that is, the actual mass is still smaller than the set mass, the first air cannon is started, and the upper coal is dredged until the requirement of the coal discharging amount of the first blanking machine is met.
Similarly, the main weighing scale 410 is used for weighing the coal amount of the second coal blending hopper 300. The control process of the second blanking machine and the second air cannon is similar to that of the first blanking machine and the first air cannon, and will not be repeated.
In addition, the original coal feeding amount is not visual, an operator does not know the actual proportioning and the planned proportioning, manual real-time calculation is needed, and particularly the problem of metering of the metering scale is solved, the blanking is not visible, and the comparison of one proportioning is more visual.
Specifically, the coal making system also comprises at least one second blanking machine and at least one second air cannon; each second coal blending hopper 300 is arranged on one second blanking machine, and each second air cannon is arranged on one second blanking machine; the second air cannon, the main scale 410 and the second blanking machine are all communicated with the controller; the controller is used for obtaining a second signal representing the actual quality of raw material coal of the main belt, which is output by the main metering scale 410, and is further used for obtaining the actual proportioning of each raw material coal according to the first signal or the second signal, and controlling the first blanking machine or the second blanking machine to stop under the condition that the actual proportioning is larger than or smaller than the planned proportioning.
Specifically, the first signal output by the sub-metering scale 210 and the second signal output by the main metering scale 410 are both instantaneous amounts, and the controller can obtain a single variety accumulation amount and a total accumulation amount according to the first signal and the second signal, then obtain an actual ratio according to the single variety accumulation amount/the total accumulation amount, and compare the actual ratio with a planned ratio, and if the actual ratio does not conform to the planned ratio, that is, the actual ratio is greater than or less than the planned ratio, control the corresponding first blanking machine or second blanking machine to stop.
If the actual ratio does not accord with the planned ratio, the controller can further judge whether the instantaneous quantity represented by the first signal and the second signal is wrong, and if the instantaneous quantity is wrong, the controller controls the corresponding first blanking machine or the corresponding second blanking machine to stop blanking. And then controlling an alarm to give an alarm to inform maintenance personnel to check.
Specifically, referring to fig. 2, the controller employs a PLC control system 710. The control computer 700 is used for inputting set quality to the PLC control system 710, the PLC control system 710 controls the disc feeder 730 to carry out blanking, in the blanking process, the metering scale 740 carries out metering and feeds back metering signals (first signals or second signals) to the PLC control system 710, the PLC control system 710 receives metering signals, when the actual quality is smaller than the set quality, the PLC control system 710 sends out a speed regulation instruction to the disc feeder 730, the metering scale 740 feeds back metering signals to the PLC control system 710 in real time, after a preset period (5 min in the embodiment) is continued, the actual quality is still smaller than the set quality, the PLC control system 710 sends out a starting instruction to the air cannon 720, and the air cannon 720 dredges the disc feeder 730. The corresponding remote operation can be carried out in the coal blending control system, and then the function of automatically starting the air cannon 720 according to the coal breaking is gradually realized.
Referring to fig. 3, 4, and 5, in this embodiment, coal making system 10 further includes pre-crush belt 500, screen 510, crusher 520, undersize belt 530, post-crush belt 540, and converging belt 550; the pre-crush belt 500 is used to convey raw coal to the screen 510, the screen 510 is used to screen the raw coal into an upper screen portion and a lower screen portion, the crusher 520 is used to crush the upper screen portion, the post-crush belt 540 is used to receive the crushed upper screen portion and convey to the converging belt 550, the lower screen belt 530 is used to receive the lower screen portion and convey to the converging belt 550, and the converging belt 550 is used to convey the converging raw coal to the coal tower.
The coal preparation process generally adopts a powder preparation process after preparation, and due to different crushing characteristics of the coal, some qualified-granularity coals (such as fat coals and the like) do not need to be crushed into finer granularity, and some difficultly crushed coals (such as lean coals, lean coals and the like) are not crushed into the required granularity. The fineness of the blended coal is an important index for measuring the crushing degree of the coal, and the fineness of the blended coal means that the crushed coal with the diameter smaller than 3mm accounts for the mass percent of the whole coal. Too low a fineness may cause segregation during transportation to cause uneven mixing, while mineral particles are larger to cause non-uniform internal structure of the coke, which may cause a decrease in coke strength. The fineness is too high, so that the power consumption of the pulverizer is increased, the production capacity of the equipment is reduced, the coal loading operation is difficult due to the increase of coal dust (smaller than 0.5 mm), the tar slag in the gas collecting tube is increased, the quality of the tar is deteriorated, even the rising tube is blocked, and meanwhile, the bulk specific gravity of the coal is reduced when the fineness is too high, so that the coke yield is reduced, and the strength is reduced; the poor sampling representativeness caused by the poor crushing of the blended coal further influences the quality index of the blended coal.
In this embodiment, the raw material coal before crushing by the crusher 520 is screened, and only the screened upper part of the raw material coal is crushed by the crusher 520 and then is converged with the undersize part and then is conveyed to the coal tower, so that the crushing granularity of the raw material coal can be supported, and the coal quality can be improved.
In this embodiment, the screening holes of the screening machine 510 are 5-6mm, and the crushing holes of the crusher 520 are 3mm. Only large particles above 5-6mm are crushed.
Referring to fig. 3 to 5, an original pre-crushing belt 600, an original crusher 610, and an original post-crushing belt 620 are sequentially provided. In this embodiment, the pre-crushing belt 500 may be installed between the original pre-crushing belt 600 and the crusher 520, and directly convey the raw coal on the original pre-crushing belt 600 to the sieving machine 510, without modifying the original crusher 520. The addition of the pre-crush belt 500, the screen 510, the crusher 520, the undersize belt 530, the post-crush belt 540, and the converging belt 550 to the original system does not require modification of the original system.
The pre-crush belt 500 conveys the raw coal to the screening machine 510, the screening machine 510 screens the raw coal, and the undersize portion is joined with the crushed coal by the undersize belt 530 by the joining belt 550 and then conveyed to the coal tower by the original post-crush belt 620. The screen section can also be crushed at the very end using the original crusher 610, but may result in unstable operation of the apparatus due to the reduced load compared to the original.
The coal making system 10 provided in this embodiment has at least the following advantages:
the first coal blending hopper 100 firstly feeds the material to the sub-belt and then feeds the material to the main belt, the sub-belt is provided with the sub-metering scale 210, the metering is carried out independently, the feeding fluctuation of the first coal blending hopper 100 only affects the metering of the first coal blending hopper and the feeding metering of other positions of the main belt, the quality of the blended coal can be improved, and the quality of coke is further improved.
Raw coal is screened before entering the crusher 520 for crushing, so that excessive crushing of the blended coal is avoided, and the environmental protection risk of smoking during coal charging is reduced. The newly added pulverizer only breaks less than 40% of the original blended coal materials, and the reduction of the power of the pulverizer has certain electricity-saving benefit.
Only the coal blending and crushing systems are slightly modified, the original systems are fully utilized, and the investment waste is avoided.
The embodiment of the invention also provides a coal making process, which is used for the coal making system 10 and comprises the following steps: the raw material coal distributed by the first coal distribution hopper 100 is conveyed to a main belt by a split belt; raw coal on the split belt is metered by the split meter 210. Can alleviate the problem of fluctuation of quality of the matched coal.
In this embodiment, the at least one sub-belt includes a first sub-belt 200 and a second sub-belt 201 disposed at intervals along a forward direction of the main belt conveyor, and the step of conveying the raw coal dispensed from the first coal hopper 100 to the main belt by the sub-belts includes:
the ratio of the raw material coal conveyed by the first sub-belt 200 to the main belt is 10-20%; the proportion of the raw material coal conveyed from the second sub belt 201 to the main belt is 3-8%.
In this embodiment, the number of main belts is at least one; the at least one main belt comprises a first main belt 400 and a second main belt 401 arranged side by side at intervals, and the coal making process further comprises:
the proportioning range of the raw material coal conveyed by the first main belt 400 to the crusher 520 is 40% -60%; the proportion range of the raw material coal conveyed to the crusher 520 by the second main belt 401 is 40% -60%.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A coal making system, comprising:
a main belt;
at least one first coal hopper (100), the at least one first coal hopper (100) being disposed above the main belt;
at least one sub-belt disposed between the at least one first coal hopper (100) and the main belt, each of the sub-belts corresponding to one of the first coal hoppers (100), the sub-belts being for conveying raw coal dispensed by the first coal hopper (100) to the main belt;
and at least one sub-metering scale (210), wherein the at least one sub-metering scale (210) is arranged on the sub-belt, each sub-metering scale (210) corresponds to one sub-belt, and the sub-metering scale (210) is used for metering raw coal on the sub-belt;
at least one second coal hopper (300) and at least one main scale (410); the at least one second coal distribution hopper (300) and the at least one first coal distribution hopper (100) are arranged above the main belt at intervals; the at least one main metering scale (410) is arranged on the main belt, and each main metering scale (410) corresponds to one second coal distribution hopper (300); the main metering scale (410) is used for metering raw coal distributed on the main belt by the second coal distribution hopper (300);
the at least one second coal distribution hopper (300) and the at least one first coal distribution hopper (100) are sequentially arranged at intervals along the forward conveying direction of the main belt, and the first coal distribution hopper (100) is close to the tail end of the main belt relative to the second coal distribution hopper (300);
the at least one sub-belt comprises a first sub-belt (200) and a second sub-belt (201) which are arranged at intervals along the forward direction of the main belt conveyor; the first sub belt (200) is used for conveying raw material coal to the main belt, and the conveying proportion is 10-20%; the second sub belt (201) is used for conveying raw material coal to the main belt, and the conveying proportion is 3-8%.
2. The coal making system of claim 1, wherein:
the number of the main belts is at least one;
at least one main belt comprises a first main belt (400) and a second main belt (401) which are arranged side by side at intervals, wherein the first main belt (400) is used for conveying raw coal to a crusher (520), and the conveying proportioning range is 40% -60%; the second main belt (401) is used for conveying raw coal to the crusher (520), and the conveying proportion range is 40% -60%.
3. The coal making system of claim 1, wherein:
the coal making system further comprises a controller, at least one first blanking machine and at least one first air cannon; each first coal distributing hopper (100) is arranged on one first blanking machine, and each first air cannon is arranged on one first blanking machine;
the first air cannon, the sub-metering scale (210) and the first blanking machine are all communicated with the controller, and the controller is used for acquiring a first signal which is output by the sub-metering scale (210) and represents the actual mass of raw material coal on the sub-belt and adjusting the batching speed of the first blanking machine under the condition that the actual mass is smaller than a set mass; the controller is also used for controlling the first air cannon to start under the condition that the actual mass is still smaller than the set mass after the preset period of time is adjusted on the batching speed of the first blanking machine.
4. A coal making system as claimed in claim 3, wherein:
the coal making system also comprises at least one second blanking machine and at least one second air cannon; each second coal distribution hopper (300) is arranged on one second blanking machine, and each second air cannon is arranged on one second blanking machine; the second air cannon, the main scale (410) and the second blanking machine are all communicated with the controller;
the controller is used for obtaining a second signal representing the actual quality of raw material coal of the main belt, which is output by the main metering scale (410), and is further used for obtaining the actual proportioning of each raw material coal according to the first signal or the second signal, and is further used for controlling the first blanking machine or the second blanking machine to stop under the condition that the actual proportioning is larger than or smaller than a planned proportioning.
5. The coal making system of claim 1, wherein:
the coal making system also includes a pre-crush belt (500), a screen (510), a crusher (520), an undersize belt (530), a post-crush belt (540), and a converging belt (550);
the crushing front belt (500) is used for conveying raw coal to the screening machine (510), the screening machine (510) is used for screening the raw coal into an upper screen part and a lower screen part, the crushing machine (520) is used for crushing the upper screen part, the crushed rear belt (540) is used for receiving the crushed upper screen part and conveying the crushed upper screen part to the converging belt (550), the lower screen belt (530) is used for receiving the lower screen part and conveying the lower screen part to the converging belt (550), and the converging belt (550) is used for conveying the converged raw coal to a coal tower.
6. A coal making process employing the coal making system of any one of claims 1-5, the coal making process comprising:
the raw material coal distributed by the first coal distribution hopper (100) is conveyed to the main belt by utilizing the split belt;
raw coal on the split belt is metered by a split metering scale (210).
7. The coal making process of claim 6, wherein the at least one sub-belt includes a first sub-belt (200) and a second sub-belt (201) disposed at intervals in a forward direction of the main belt conveyor, and wherein the step of conveying the raw coal dispensed from the first coal hopper (100) to the main belt by the sub-belt includes:
the ratio of the first sub-belt (200) to the main belt for conveying raw material coal is 10-20%; the proportion of the raw material coal conveyed by the second sub belt (201) to the main belt is 3-8%.
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| CN207786513U (en) * | 2017-12-26 | 2018-08-31 | 广州发展集团股份有限公司 | Automatic Allocating Coal System |
| CN111520735A (en) * | 2020-05-12 | 2020-08-11 | 四川重盟电力设备制造有限公司 | Step-by-step decrement coal preparation system |
| CN112027708A (en) * | 2020-08-31 | 2020-12-04 | 山东钢铁集团日照有限公司 | Large-diameter silo uniform blanking and coal blending device and method |
| CN214166229U (en) * | 2020-11-21 | 2021-09-10 | 西安热工研究院有限公司 | Accurate coal blending system for coal-fired power plant |
| CN113731295A (en) * | 2021-09-28 | 2021-12-03 | 中冶赛迪工程技术股份有限公司 | Coal blending system |
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| GB839817A (en) * | 1957-07-29 | 1960-06-29 | Stamicarbon | A process and apparatus for the preparation of loose solid materials of predetermined mixed composition |
| JP2000118718A (en) * | 1998-10-15 | 2000-04-25 | Kawasaki Steel Corp | Granular material level control method for receiving hopper |
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