CN115610950A - Dry-based coal blending system and method - Google Patents
Dry-based coal blending system and method Download PDFInfo
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- CN115610950A CN115610950A CN202211398203.1A CN202211398203A CN115610950A CN 115610950 A CN115610950 A CN 115610950A CN 202211398203 A CN202211398203 A CN 202211398203A CN 115610950 A CN115610950 A CN 115610950A
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- 239000003245 coal Substances 0.000 title claims abstract description 292
- 238000002156 mixing Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005303 weighing Methods 0.000 claims description 71
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 28
- 229910052742 iron Inorganic materials 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 9
- 238000005299 abrasion Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 241000273930 Brevoortia tyrannus Species 0.000 description 15
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
- B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G27/00—Jigging conveyors
- B65G27/10—Applications of devices for generating or transmitting jigging movements
- B65G27/16—Applications of devices for generating or transmitting jigging movements of vibrators, i.e. devices for producing movements of high frequency and small amplitude
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/32—Filling devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
- B65G65/42—Devices for emptying otherwise than from the top using belt or chain conveyors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
- B65G69/12—Sieving bulk materials during loading or unloading
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention belongs to the field of coal-carbon metallurgy, and relates to a dry-base coal blending system and a dry-base coal blending method, which realize dry-base coal blending, ensure stable component analysis of mixed coal, ensure safe production, realize accurate coal blending of various coals, stabilize production consumption, provide basic guarantee for balance of production and purchase plans, and solve the problems of quick and on-line switching of the coal feeding process of a mixed coal bunker; the invention can realize the accurate coal blending of the raw coal, effectively reduce the deviation of the actual composition analysis data and the theoretical analysis data of the mixed coal, realize the on-line switching of the mixed coal bunker in the coal blending process and provide a solid and reliable foundation for the stability of production.
Description
Technical Field
The invention belongs to the field of coal-carbon metallurgy, and relates to a dry-base coal blending system and a dry-base coal blending method.
Background
Most of the current coal blending systems adopt wet-based coal blending, and the moisture of raw coal and the moisture evaporation in the subsequent drying process are not fully considered. Because the water data deviation of each coal type is large, the deviation of the actual components of the mixed coal from the theoretical data is large after the raw coal is dried and the water is evaporated.
A common problem of the coal blending system exists at present, namely, compared with the consumption data of planned proportioning, the actual consumption data of various coals has the condition of larger deviation, and accurate coal blending cannot be realized. The contradiction that the consumption of a certain coal is excessive and the storage is insufficient in a certain coal is caused, so that the coal blending cost is influenced, and the preset supply plan of the raw coal is seriously disturbed.
In the existing actual production process, a plurality of mixed coal bunkers share one coal blending system, but the coal bunkers are not easy to switch.
Disclosure of Invention
In view of the above, the present invention provides a dry-based coal blending system and method, which achieve accurate coal blending of dry-based coal blending and various coals and solve the problem of fast and on-line switching in the coal feeding process of a mixed coal bunker.
In order to achieve the purpose, the invention provides the following technical scheme: a dry-base coal blending system comprises more than 1 receiving hopper, a coal blending weighing belt arranged at the outlet of the receiving hopper, a coal blending belt arranged below the coal blending weighing belt, and a multi-section coal conveying belt; more than 1 plow discharger and a mixed coal bunker arranged corresponding to the plow discharger are arranged on the tail section of the coal conveying belt; the coal blending weighing belt and the plow discharger are communicated with a PLC control system.
Optionally, the coal blending weighing belt is provided with a weighing carrier roller, a weighing sensor and a speed sensor which are communicated with the PLC control system.
Optionally, a rapper is arranged on each receiving hopper.
Optionally, the coal conveying belt is respectively provided with three sections, namely a first coal conveying belt, a second coal conveying belt and a third coal conveying belt in sequence, and the plough type discharger is arranged on the third coal conveying belt.
Optionally, a first iron remover is arranged on the first coal conveying belt, a shuttle groove is arranged between the first coal conveying belt and the second coal conveying belt, and a vibrator is arranged on the shuttle groove.
Optionally, the bottom of the shuttle groove is further provided with a raw coal sieve with a screen, the second coal conveying belt is arranged below the screen of the raw coal sieve, and the tail end of the raw coal sieve is provided with a large coal and sundry collecting hopper.
Optionally, a second iron remover is arranged on the second coal conveying belt.
A dry-base coal blending method is applied to the dry-base coal blending system, and the receiving hopper, the coal blending weighing belt, the mixed coal bin and the plough type discharger are respectively provided with three parts, and the dry-base coal blending method comprises the following steps:
s1, respectively loading raw coal of corresponding types into three receiving hoppers according to selected coal types;
s2, inputting dry basis proportions and moisture of various raw coals through a PLC control system;
s3, selecting the number of the mixed coal bunker to be fed, switching the corresponding state of the plough-type discharger, and discharging the raw coal on the third coal conveying belt into the coal bunker through the corresponding plough-type discharger;
s31, when the coal enters the first mixed coal bunker, the first plough type discharger is required to be in a falling state, and at the moment, the second plough type discharger and the third plough type discharger are in a lifting state, so that the abrasion caused by the friction between the second plough type discharger, the third plough type discharger and a belt can be reduced;
s32, when the coal enters the second mixed coal bin, the first plough-type discharger is in a lifting state, the second plough-type discharger is in a falling state, and the third plough-type discharger is in a lifting state, so that the abrasion caused by the friction between the third plough-type discharger and a belt is reduced;
s33, when the coal enters a third mixed coal bin, the third plough type discharger is required to be in a falling state, and the first plough type discharger and the second plough type discharger are required to be in a lifting state;
s4, starting a second coal conveying belt and a second iron remover;
s5, starting a raw coal sieve;
s6, starting a first coal conveying belt and a first iron remover;
s7, starting a coal mixing belt;
s8, respectively starting three coal blending weighing belts below the receiving hopper;
s9, starting the three receiving hoppers and the vibrators arranged on the shuttle grooves;
s10, in the process that the blended coal enters the mixed coal bunker, impurities in the coal are screened and filtered through a raw coal screen, raw coal with the granularity smaller than 50mm directly falls into a second coal conveying belt, and the impurities and large blocks of coal in the coal directly enter a large coal and impurity collecting hopper after being screened and filtered through a raw coal screen mesh.
Optionally, the raw coal in the receiving hopper is shaken by a shaker and uniformly falls on a coal blending weighing belt, and the raw coal falling on the coal blending weighing belt is a water-containing wet base;
wherein, the principle of a coal blending weighing belt is as follows: the coal blending weighing belt is provided with a weighing carrier roller, a weighing sensor and a speed sensor, the weighing carrier roller transfers the weight of the loaded material to the weighing sensor, the weighing sensor converts the weight of the loaded material into an electric signal, and the electric signal is conveyed to the PLC control system by a cable. Meanwhile, the speed sensor converts the running speed of the belt into an electric signal and transmits the electric signal to the PLC control system; the two signals are processed by a PLC control system, and different belt rotating speeds correspond to different weighing data and are displayed;
and (3) a control tracking process of the PLC control system: if the first coal blending weighing belt is called a reference scale and the corresponding coal type is the reference coal type, the three coal blending weighing belt scales are respectively provided with a fixed rotating speed in the running process, and the rotating speed of the three coal blending weighing belt scales corresponds to the 'moisture-containing wet base' weighing data; the other two coal blending weighing belt weighers are tracking scales, and the corresponding coal types are tracking coal types; the PLC control system collects data such as moisture of a reference coal type, dry basis ratio of the reference coal type, moisture of tracking coal type, dry basis ratio of tracking coal type and the like, then carries out coefficient conversion and controls and adjusts belt rotating speed of a tracking scale, and the specific conversion method and the tracking process are as follows:
belt rotation speed of tracking scale = belt rotation speed of reference scale x (100% -moisture of reference coal type) ÷ (100% -moisture of tracking coal type) × dry basis ratio of tracking coal type ÷ dry basis ratio of reference coal type; and finally, the actual weighing data of the tracking scale is fed back by tracking the belt rotating speed of the scale.
The invention has the beneficial effects that: a dry-base coal blending system and a dry-base coal blending method can achieve accurate coal blending of raw coal, effectively reduce deviation of actual component analysis data and theoretical analysis data of mixed coal, achieve online switching of a mixed coal bunker in a coal blending process, and provide a solid and reliable foundation for production stability.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
Drawings
For a better understanding of the objects, aspects and advantages of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a flow chart of the control principle of the present invention.
Reference numerals: the device comprises a first receiving hopper 1, a second receiving hopper 2, a third receiving hopper 3, a coal blending weighing belt 4, a coal mixing belt 5, a first coal conveying belt 6, a first iron remover 7, a shuttle groove 8, a raw coal sieve 9, a large lump coal and sundries collecting hopper 10, a second coal conveying belt 11, a second iron remover 12, a first plough type discharger 13, a second plough type discharger 14, a third plough type discharger 15, a first coal mixing bin 16, a second coal mixing bin 17, a third coal mixing bin 18, a third coal conveying belt 19 and a vibrator 20.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 2, a dry-basis coal blending system includes a first receiving hopper 1, a second receiving hopper 2 and a third receiving hopper 3, a coal blending weighing belt 4 respectively disposed at the outlet positions of the three receiving hoppers, a coal blending belt 5 disposed below the coal blending weighing belt 4, and a coal conveying belt having multiple sections; more than 1 plow discharger and a mixed coal bunker which is arranged corresponding to the plow discharger are arranged on the tail section of the coal conveying belt; the coal blending weighing belt 4 is communicated with the plow discharger to form a PLC control system, the coal blending weighing belt 4 is provided with a weighing carrier roller communicated with the PLC control system, the weighing sensor and a speed sensor, each receiving hopper is provided with a vibrator 20, the coal conveying belt is sequentially provided with three sections, a first coal conveying belt 6, a second coal conveying belt 11 and a third coal conveying belt 19 are arranged respectively, the plow discharger is arranged on the third coal conveying belt 19, the first coal conveying belt 6 is provided with a first iron remover 7, a shuttle groove 8 is arranged between the first coal conveying belt 6 and the second coal conveying belt 11, the shuttle groove 8 is provided with the vibrator 20, the bottom of the shuttle groove 8 is further provided with a raw coal sieve 9 with a sieve, the second coal conveying belt 11 is arranged below the sieve of the raw coal sieve 9, the tail end of the raw coal sieve 9 is provided with a large coal and sundry concentrated hopper 10, and the second coal conveying belt 11 is provided with a second iron remover 12.
In this embodiment, three receiving hoppers can all select the coal charging variety, and simultaneously, the dry basis proportion and the moisture of the corresponding coal can be input.
A dry-base coal blending method is applied to the dry-base coal blending system, and the receiving hopper, the coal blending weighing belt 4, the mixed coal bin and the plough type discharger are respectively provided with three parts, and the dry-base coal blending method comprises the following steps:
s1, respectively loading raw coal of corresponding types into three receiving hoppers according to selected coal types;
s2, inputting dry basis proportions and moisture of various raw coals through a PLC control system;
s3, selecting the number of the mixed coal bunker to be fed, switching the corresponding state of the plough-type discharger, and discharging the raw coal on the third coal conveying belt 19 into the coal bunker through the corresponding plough-type discharger (online switching can be realized in the coal blending process);
s31, when the coal enters the first mixed coal bunker 16, the first plough discharger 13 is in a falling state, and the second plough discharger 14 and the third plough discharger 15 are in a lifting state, so that the abrasion caused by the friction between the second plough discharger 14 and the belt and the third plough discharger 15 can be reduced;
s32, when the coal enters the second mixed coal bin 17, the first plough type unloading device 13 needs to be in a lifting state, the second plough type unloading device 14 needs to be in a falling state, and the third plough type unloading device 15 is in a lifting state, so that the abrasion caused by the friction between the third plough type unloading device 15 and a belt is reduced;
s33, when the coal enters the third mixed coal bunker 18, the third plough discharger 15 needs to be in a falling state, and the first plough discharger 13 and the second plough discharger 14 need to be in a lifting state;
s4, starting a second coal conveying belt 11 and a second iron remover 12;
s5, opening a raw coal sieve 9;
s6, starting the first coal conveying belt 6 and the first iron remover 7;
s7, opening a coal mixing belt 5;
s8, respectively starting three coal blending weighing belts 4 below the receiving hopper;
s9, starting the three receiving hoppers and the rappers 20 arranged on the shuttle groove 8;
s10, in the process that the blended coal enters the mixed coal bunker, impurities in the coal are screened and filtered through the raw coal screen 9, the raw coal with the granularity smaller than 50mm directly falls into the second coal conveying belt 11, and the impurities in the coal and the large coal directly enter the large coal and impurity collecting hopper 10 after being screened and filtered through the raw coal screen 9.
Optionally, the raw coal in the receiving hopper is rapped through a rapper 20 and uniformly falls onto the coal blending weighing belt 4, and the raw coal falling onto the coal blending weighing belt 4 at the moment is a water-containing wet base;
wherein, the principle of coal blending weighing belt 4: the coal blending weighing belt 4 is provided with a weighing carrier roller, a weighing sensor and a speed sensor, the weighing carrier roller transfers the weight of the loaded material to the weighing sensor, the weighing sensor converts the weight of the loaded material into an electric signal, and the electric signal is transmitted to the PLC control system through a cable. Meanwhile, the speed sensor converts the running speed of the belt into an electric signal and transmits the electric signal to the PLC control system; the two signals are processed by a PLC control system, and different belt rotating speeds correspond to different weighing data and are displayed;
and (3) a control tracking process of the PLC control system: if the first coal blending weighing belt 4 is called as a reference scale and the corresponding coal type is the reference coal type, a fixed rotating speed is given during the operation process, and the rotating speed corresponds to a 'moisture-containing wet base' weighing data; the other two coal blending weighing belts 4 are tracking scales, and the corresponding coal types are tracking coal types; the PLC control system collects data such as moisture of a reference coal type, dry basis proportion of the reference coal type, moisture of tracking coal type, dry basis proportion of tracking coal type and the like, then carries out coefficient conversion and controls and adjusts belt rotating speed of a tracking scale, and the specific conversion method and tracking process are as follows:
the belt rotation speed of the tracking scale = the belt rotation speed of the reference scale x (100% -moisture of the reference coal type) ÷ (100% -moisture of the tracking coal type) × the dry basis proportion of the tracking coal type ÷ the dry basis proportion of the reference coal type; and finally, the actual weighing data of the tracking scale is fed back by tracking the belt rotating speed of the scale.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A dry-based coal blending system is characterized in that: the coal blending and weighing device comprises more than 1 receiving hopper, a coal blending weighing belt arranged at the outlet of the receiving hopper, a coal blending belt arranged below the coal blending weighing belt, and a multi-section coal conveying belt; more than 1 plow discharger and a mixed coal bunker which is arranged corresponding to the plow discharger are arranged on the tail section of the coal conveying belt;
the coal blending weighing belt and the plow discharger are communicated with a PLC control system.
2. The dry-based coal blending system according to claim 1, wherein: the coal blending weighing belt is provided with a weighing carrier roller, a weighing sensor and a speed sensor which are communicated with the PLC control system.
3. The dry-based coal blending system according to claim 1, wherein: each receiving hopper is provided with a vibrator.
4. The dry-based coal blending system according to claim 1, wherein: the coal conveying belts are respectively and sequentially provided with three sections, namely a first coal conveying belt, a second coal conveying belt and a third coal conveying belt, and the plough type discharger is arranged on the third coal conveying belt.
5. The dry-based coal blending system according to claim 4, wherein: the first coal conveying belt is provided with a first iron remover, a shuttle groove is arranged between the first coal conveying belt and the second coal conveying belt, and a vibrator is arranged on the shuttle groove.
6. The dry-based coal blending system according to claim 5, wherein: the bottom of the shuttle groove is also provided with a raw coal sieve with a screen, the second coal conveying belt is arranged below the screen of the raw coal sieve, and the tail end of the raw coal sieve is provided with a large coal and sundry centralized hopper.
7. The dry-based coal blending system according to claim 4, wherein: and a second iron remover is arranged on the second coal conveying belt.
8. A dry-based coal blending method, which applies a dry-based coal blending system as claimed in any one of claims 1 to 7, wherein three receiving hoppers, three coal blending weighing belts, three mixed coal bins and three plough type dischargers are respectively arranged, and the method is characterized by comprising the following steps:
s1, respectively loading raw coal of corresponding types into three receiving hoppers according to selected coal loading varieties;
s2, inputting dry basis proportions and moisture of various raw coals through a PLC control system;
s3, selecting the number of the mixed coal bunker to be fed, switching the corresponding state of the plough-type discharger, and discharging the raw coal on the third coal conveying belt into the coal bunker through the corresponding plough-type discharger;
s31, when the coal enters the first mixed coal bunker, the first plough type discharger is required to be in a falling state, and at the moment, the second plough type discharger and the third plough type discharger are in a lifting state, so that the abrasion caused by the friction between the second plough type discharger, the third plough type discharger and a belt can be reduced;
s32, when the coal enters the second mixed coal bin, the first plough-type discharger is in a lifting state, the second plough-type discharger is in a falling state, and the third plough-type discharger is in a lifting state, so that the abrasion caused by the friction between the third plough-type discharger and a belt is reduced;
s33, when the coal enters a third mixed coal bunker, the third plough type discharger needs to be in a falling state, and the first plough type discharger and the second plough type discharger need to be in a lifting state;
s4, opening a second coal conveying belt and a second iron remover;
s5, starting a raw coal sieve;
s6, starting a first coal conveying belt and a first iron remover;
s7, opening a coal mixing belt;
s8, respectively starting three coal blending weighing belts below the receiving hopper;
s9, starting the three receiving hoppers and the vibrators arranged on the shuttle grooves;
s10, in the process that the blended coal enters the mixed coal bunker, impurities in the coal are screened and filtered through a raw coal screen, raw coal with the granularity smaller than 50mm directly falls into a second coal conveying belt, and the impurities and large blocks of coal in the coal directly enter a large coal and impurity collecting hopper after being screened and filtered through a raw coal screen mesh.
9. The dry-based coal blending method according to claim 8, characterized in that: the raw coal in the receiving hopper is shaken by a shaker and uniformly falls on a coal blending weighing belt, and the raw coal falling on the coal blending weighing belt is a water-containing wet base;
wherein, the belt principle is weighed to the coal blending: the coal blending weighing belt is provided with a weighing carrier roller, a weighing sensor and a speed sensor, the weighing carrier roller transfers the weight of the loaded material to the weighing sensor, the weighing sensor converts the weight of the loaded material into an electric signal, and the electric signal is conveyed to the PLC control system by a cable. Meanwhile, the speed sensor converts the running speed of the belt into an electric signal and transmits the electric signal to the PLC control system; the two signals are processed by a PLC control system, and different belt rotating speeds correspond to different weighing data and are displayed;
and (3) a control tracking process of the PLC control system: if the first coal blending weighing belt is called a reference scale and the corresponding coal type is the reference coal type, the three coal blending weighing belt scales are respectively provided with a fixed rotating speed in the running process, and the rotating speed of the three coal blending weighing belt scales corresponds to the 'moisture-containing wet base' weighing data; the other two coal blending weighing belt weighers are tracking scales, and the corresponding coal types are tracking coal types; the PLC control system collects data such as moisture of a reference coal type, dry basis ratio of the reference coal type, moisture of tracking coal type, dry basis ratio of tracking coal type and the like, then carries out coefficient conversion and controls and adjusts belt rotating speed of a tracking scale, and the specific conversion method and the tracking process are as follows:
belt rotation speed of tracking scale = belt rotation speed of reference scale x (100% -moisture of reference coal type) ÷ (100% -moisture of tracking coal type) × dry basis ratio of tracking coal type ÷ dry basis ratio of reference coal type; and finally, the actual weighing data of the tracking scale is fed back by tracking the belt rotating speed of the scale.
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