CN106153385B - As-fired coal sampling system and application method - Google Patents

Abstract

The invention discloses a coal sampling system and a method for using it. The system comprises a strut, a laser reflection plate is arranged on the top of the strut, and a laser range finder is movably arranged in the middle or lower part of the strut; The straps are attached to the struts. The beneficial effects of the invention are as follows: the invention can automatically collect coal samples fed into the furnace, effectively reduce the labor intensity of the coal sample sampling personnel, protect the safety of the sampling personnel, and can effectively prevent coal leakage and protect the cleanliness of the surrounding environment for sampling The invention adopts the intelligent control system to realize the intelligent real-time and continuous collection of coal into the furnace, and can collect the coal samples into the furnace intelligently according to the operating state of the boiler and the type of mixed coal, which effectively solves the traditional sampling method of coal into the furnace. The problems of poor, contingency and randomness have improved the representativeness and accuracy of coal preparation.

Description

As-fired coal sampling system and application method

Technical field

The present invention relates to the technical fields of coal-burning boiler (especially large-sized station boiler) performance supervision and detection, specifically relate to And as-fired coal sampling system and application method.

Background technique

For thermal power generation corporations, main fuel of the coal as large-sized station boiler, fuel cost accounts for its total fortune 85% or more of row cost will accurately calculate fuel cost and necessarily require accurately to sample as-fired coal, especially progress pot Also more stringent to the sampling requirement of as-fired coal when furnace performance test, as-fired coal samples' representativeness, accuracy will directly affect It is that related boiler performance calculates as a result, still the regulation not sampled less about entering furnace at present, in " the power station national standard GB10184-88 Boiler performance test regulation " in page 21 5.6 the sampling and analysis of fuel made described below: it is required that from the original in movement It is sampled in coal stream, the sampling time is equal with the boiler test operating condition time using interval sampling, as-fired coal sampling spade length × width × height For 300mm × 200mm × 50mm.But it is not described in for sampling utensil used, sampling procedure or use artificial sample are also It is that machine sampling is not all described, the representativeness and accuracy that how to guarantee the as-fired coal sample of acquisition is not done and retouched in detail It states, it is larger especially for the unit pulverized-coal system difficulty of positive pressure, since the pressure in feeder reaches 5kPa or more, such as take The improper personal injury that will cause sampling personnel of sample, it is previous to sample personnel often since the bad or sample position of sealing is not easy to operate It is sprayed on the face Deng by raw coal.And since the bought coal in coal-burning power plant is very mixed and disorderly, the acquired coal sample of sampling mode at present It cannot represent real as-fired coal sample, therefore no matter from protection sampling personnel personal safety or improve the representative of sampling Property, in terms of accuracy for, it is necessary to develop it is a set of it is intelligentized enter furnace sampler, which realizes automatic sampling, and It can selectively sample, can be sampled with number, the variation of boiler load etc. of as-fired coal kind, be both avoided that in this way Artificial sampling accidental error, the problem of the sampling representativeness difference also avoided, and reduce the labor intensity of sample collector, entirely Face improves the accuracy of as-fired coal sampling, to reduce boiler performance test error, accurately calculates fuel cost for power plant It provides and guarantees.

The coal flow of coal-burning power plant: the coal of train, automobile or ship transportation raw coal to power plant is briefly introduced first , and coal yard accumulate, then sent by belt to run coal bin, falling into feeder from run coal bin, if it is coal-powder boiler then into Enter coal pulverizer, wears into coal dust feeding boiler if it is layer burner or circulating fluidized bed boiler and be then sent directly into boiler combustion, be The continuity of boiler combustion is kept, general run coal bin plays buffer function, prevents belt failure and disconnected coal, run coal bin at least can The coal amount of storage 4 hours.From the optimum position that the above coal-fired process can be seen that as-fired coal sampling in run coal bin lower part, coal is given Machine top is the most suitable.

The document for introducing intelligent as-fired coal sampler this respect through retrieval does not have.

By retrieval, the related patents of raw coal sampling are divided into three classes, and the first kind is the sampling of coal as received, when coal is from coal mine When being transported to power plant, the device such as CN200520129755.8 sampled on means of transport (such as automobile, train, steamer) is complete Automated intelligent sampling system, this patent and this patent are entirely different in terms of principle and applicable object, herein without comparison. Second class is the sampler such as CN89214988.4 raw coal sampler carried out on belt, CN92219969.8 rocker-arm raw coal Sampler, the two patents and this patent are entirely different in terms of principle and applicable object, herein also without comparison.Current Belt sampler can be realized continuous sampling, and the coal on belt first has to enter run coal bin, stop in run coal bin 4-8 small Shi Caineng is sent into burning in furnace, that is to say, that the acquirement coal sample on belt is not real as-fired coal sample；Third class is The portable raw coal sampling device of simple raw coal sampling device such as CN201410799128.9, CN201420296381.8 one kind are novel Hand-held raw coal sampling device, the portable raw coal sampling device of CN201420486376.3, CN201520191860.8 is a kind of Portable raw coal sampler, these samplers of CN201520285881.6 raw coal sampling device are all that some structures are simply artificial Sampling equipment can not achieve a large amount of samplings or continuous accurate sampling, it is important to labor intensive, sample position is poor or system at Danger can be generated under the situation of positive pressure.

By being analyzed above it is found that accurately the sampling of as-fired coal is to carry out boiler performance to detect necessary condition and pot Furnace runs the important evidence of firing optimization, but current sampling mode there are problems that: (1), entering furnace samples' representativeness not By force, synchronism is not strong and contingency is larger.(2), as-fired coal sampling mode is most of or using artificial acquisition, even if belt takes Sample realizes continuous automatic sampling, due to existing compared with large time difference, cannot represent as-fired coal sample, not be suitable for stringent performance and survey Examination, boiler operatiopn supervision and crash analysis.(3), manually acquisition as-fired coal sample wants labor intensive, to may cause to sampling personnel Injury can spray raw coal when sampling especially out of positive pressure powder-making system and wound sampling personnel.It is therefore desirable to invent one to be inserted in Furnace coal sampler, the device can replace manpower intelligently to carry out the acquisition of as-fired coal sample, improve be taken into furnace coal sample Representative and accuracy.

Summary of the invention

The invention proposes as-fired coal sampling system and its application method, the system can automatic, continuous sampling avoid The randomness and contingency of conventional manual's sampling method, and can be according to coal type change situation, boiler load, assay need and Test requirements document etc. adjusts the sampling frequency at any time, effectively improves the accuracy of sampling, and do not need to examine in entire sampling process Survey personnel participate in, and realize intelligence sampling.

In order to achieve the above objectives, the present invention adopts the following technical scheme:

The first string provided by the invention is: as-fired coal sampling system, and the as-fired coal sampling system is set to raw coal The side in storehouse, the system include: isolation baffle plate, and run coal bin is equipped with an opening, and isolation baffle plate is openable to be fixed on opening use In prevent raw coal from run coal bin reveal；It controls isolation baffle plate and is controlled by the second rotating electric machine and rotated, isolation baffle plate is from below up It opens side；Opening action direction then in contrast, by direction of action position this switch direction can prevent raw coal particle bite and Isolation baffle plate is caused to be not closed completely.

Bar is acquired, one end of bar is acquired towards opening and acquisition bar is equipped with sample unit, acquisition bar has sharpening forward ends, Acquisition bar is connect with it is driven to the mobile driving mechanism of opening；Acquisition bar activity is fixed on bracket, and bracket and run coal bin are solid Fixed, acquisition bar is passed through by driving mechanism relative to bracket and is exited after opening is sampled by sample unit from opening；

Shell, set on the side of opening；

Coal-loading mechanism is used to receive the coal sample that sample unit takes out out of run coal bin set on the bottom of shell.

Further, the sample unit is set on the helical blade for acquiring bar surface, and the helical blade of foremost Length be it is short, along acquisition bar direction it is progressively longer, the acquisition bar is connect with rotating electric machine, rotating mechanism set on drive On movable plate, driving plate is fixed with straight line driving mechanism, is achieved in mobile drive in turn of driving plate and is acquired moving forward and backward for bar, And the rotation of acquisition bar is driven by rotating electric machine.

The helical blade length is the half of entire acquisition pole length, and wherein the front half section of helical blade is gradually to open Blade, the length that this part is equipped with progressively longer helical blade acquisition bar is acquire bar total length 1/6th, installation The length for having equal elongated helical blades acquisition bar is one third, for helical blade length and spacing according to boiler performance test The granularity requirements of each coal or the granularity of specific power plant's as-fired coal determine in regulation.

In this way, straight line driving mechanism and rotating electric machine drive acquisition bar to be rotationally advancing into run coal bin, pass through helical blade Coal sample is collected, then linear drive motor retreats, and rotating electric machine reversely rotates, and takes coal sample out of run coal bin, drops into shell It is interior, then fall into coal-loading mechanism.

Further, institute's samples of coal pulled loses moisture and influences the accuracy of coal qualities test, the coal-loading mechanism in order to prevent Top openable sealing cover is set.

Further, there are two the sealing covers, two split settings of sealing cover are equipped with track at the top of coal-loading mechanism and use Mobile in sealing cover, two sealing covers are electric magnetic absorbing door.

Further, weight sensor is set in the bottom of the coal-loading mechanism, the precision and range of weight sensor can According to boiler performance test request and power plant's in-service surveillance it needs to be determined that.

Further, it is arranged one on the bracket and moves back limit switch into limit switch and one, in the acquisition bar On be provided with a touching bar, when acquisition bar moves forward, when the position for touching bar and when being contacted into limit switch, opened into limit Pass sends a signal to linear drive motor, and control acquisition bar halts, when acquiring bar and retreating, when the position of touching bar with move back When limit switch contacts, moving back limit switch and send a signal to linear drive motor, control acquisition bar stops retreating,

Into limit switch and to move back limit switch can all be optoelectronic switch, and the two is arranged in the lower surface of bracket, into limit For bit switch relative to opening of the limit switch closer to run coal bin is moved back, the two, which is staggered, acquires the long axis centerline setting of bar.

Further, the diameter of the shell is from the opening to the coal-loading mechanism reduced diameter, shell It is made of common iron sheet, is mainly used to that the coal sample of taking-up is guided to coal-loading mechanism and coal is prevented to be scattered to pollute environment, specifically Shape can make according to physical condition, it is desirable that guarantee that coal outlet is arranged at lower part, coal outlet size and following coal-loading mechanism match, preceding After set inlet and outlet, the size for importing and exporting size and helical blade matches, and is fixed on bracket.

It further, further include control unit, control unit and the rotating electric machine, linear drive motor, electromagnetism are inhaled The second rotating electric machine that door and control isolation baffle plate are opened individually connects.

Another program provided by the invention: the application method of as-fired coal sampling system, the specific steps are as follows:

1) after control system receives sampling instruction, isolation baffle plate is opened；

2) control system control rotating electric machine and linear drive motor movement drive acquisition bar mobile to the opening of run coal bin；

3) coal is fallen downwards by shell after being sampled by sample unit；

4) control system controls electric magnetic absorbing door and opens, and after coal sample falls into coal-loading mechanism, electric magnetic absorbing door is closed, and has sampled At.

The beneficial effects of the present invention are:

1, the present invention is located at run coal bin side, feeder top sampling, more representative of the practical coal-fired situation of boiler, as-fired coal Sample has stronger representativeness.

2, automatic collection as-fired coal sample may be implemented in the present invention, effectively reduces the labor intensity of coal sample sampling personnel, protects The safety of sample collector has been protected, and leakage coal can be effectively prevent, has protected the cleaning of sampling ambient enviroment.

3, the present invention using intelligence control system realize intelligently in real time, be carried out continuously as-fired coal acquisition, can basis Boiler operatiopn state, mixed coal type intelligently acquire as-fired coal sample, efficiently solve the representative of traditional as-fired coal sampling method The poor, contingency of property and the stronger problem of randomness, improve the representativeness and accuracy of coal separation.

Detailed description of the invention

The intelligent as-fired coal sampling system schematic diagram of Fig. 1；

Fig. 2 acquires bar schematic diagram；

Fig. 3-1 driving plate schematic top plan view；

Fig. 3-2 driving plate left view schematic diagram；

Fig. 3-3 driving plate partial enlargement diagram；

Fig. 4-1 driving principle schematic diagram；

Fig. 4-2 drives gear schematic diagram；

Fig. 4-3 driving principle partial schematic diagram；

Fig. 5-1 sealing cover structure schematic diagram；

Fig. 5-2 sealing cover schematic top plan view；

Fig. 5-3 sealing cover left view schematic diagram；

Fig. 6 coalings a barrel schematic top plan view；

Fig. 7 control system schematic illustration；

In figure: 1, run coal bin, 2, isolation baffle plate, 3, helical blade, 4, control unit, 5, oblique pull gusset, 6, driving motor, 7, driving plate, 8, bracket, 9, move back limit switch, 10, acquisition bar, 11, non-driven-end bearing, 12, drive end bearing, 13, rotation Motor, 14, into limit switch, 15, closure, 16, sealing cover, 17, bucket of coalingging, 18, support frame, 19, weight sensor, 20, drive rack, 21, driven wheel, 22, connecting rib, 23, driving gear, 24, electromagnetic coil, 25, iron block, 26, spring, 27, Spring carrier arm, 28, movable pulley, 29, sealing cover track.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Whole description.

Power plant, Hua electricity group #3 boiler is subcritical, the intermediate single reheat of evaporation capacity 1025t/h, Natural Circulation drum Furnace, combustion system are Terms of Corner Tangential Combustion, and there are six layers of coal burner at every angle, with overfire air port arranged for interval, powder processed System is that BBD4062 type goes with each other all the time formula low speed coal mill pressurized direct pulverizing coal system, and slagging-off mode is water sluice, in order to The accuracy for improving as-fired coal sampling, down-samples personnel labor intensity.

It is illustrated in conjunction with intelligent as-fired coal sampling system of the Fig. 1 to #3 boiler erection, to the fortune of boiler milling system Row situation, material, wall thickness and the bulk of feeder operation of run coal bin are inquired and are measured, and necessary data is obtained And design the various components of the system.According to measurement gained size can prefabricated acquisition bar 10, driving plate 7, bracket 8, sealing outside Shell 15, sealing cover 16, control unit 4 etc. are selected according to design parameter, are then installed these equipment, component and material, even Connecing can start to debug.

As-fired coal acquisition system includes isolation baffle plate 2, acquires bar 10 and rotating electric machine 13 and some auxiliary original parts.Isolation The use of baffle 2 is electronic, and mounting means is directly to select suitable position on run coal bin 1, cuts open a suitable circular hole and is welded on Above, wherein it should be noted that be a little that raw coal particle bite isolation baffle plate causes isolation baffle plate 2 to be not closed completely in order to prevent, It is required that the closing direction of isolation baffle plate 2 is obliquely to close from obliquely downward.The specific structure of acquisition bar 10 is shown in Fig. 2, acquires bar 10 include helical blade 3, non-driven-end bearing 11, drive end bearing 12, rotating electric machine 13.It is certain hard for acquiring the matrix of bar 10 The wear-resisting steel pole of degree welds helical blade 3 on steel pole, and wherein the length of winding screw blade 3 is entire acquisition 10 length of bar Half, wherein preceding 1/6th is gradually open blade, i.e. the length of helical blade 3 gradually increases, and rear one third is etc. The length of elongated helical blade, i.e. helical blade is constant.Drive end bearing 12 selects thrust roller bearing, non-drive in this embodiment Moved end bearing 11 selects radial roller bearing, and variable-frequency motor is used in the selection of rotating electric machine 13.It can retreat to guarantee to acquire bar 10 In place, provided with into limit switch 14 and moving back limit switch 9.Closure 15 is made of common iron sheet, and coal outlet is arranged at lower part, Coal outlet size and the following matching of bucket 17 of coalingging, front and back set inlet and outlet, and the size for importing and exporting size and helical blade matches.It is whole A as-fired coal acquisition system is fixed on bracket 8.

Drive system is the mechanism that driving acquisition bar 10 moves forward and backward, and driving principle is shown in Fig. 4-1, which mainly includes Driving plate 7 drives gear 23, driving motor 6, bracket 8, referring specifically to Fig. 3-1,3-2,3-3, Fig. 4-2 and 4-3.Driving plate 7 is Fig. 3-1,3-2,3-3 are seen in inverted T shaped metal plate in section, and drive rack 20, movable pulley 28, dowel are arranged in driving plate 7 Plate 22, driven wheel 21 uses metal wheel or rigid plastics wheel in this case study on implementation；Connecting rib 22 is welded in driving plate 7, Driving end and non-driven-end bearing are bolted on connecting plate 22.Fig. 4-Isosorbide-5-Nitrae-2 and 4-3 illustrate driving method, Driving gear 23 is engaged with drive rack 20 for moving driving plate, and driving gear 23 is connect with driving motor 6.

The effect of bracket 8 is exactly that above-mentioned as-fired coal acquisition system and each equipment of drive system and device are fixed And support, bracket 8 are directly welded on run coal bin 1, and are reinforced with oblique pull gusset 5, bracket 8 mainly uses easy-to-dismount Lightweight but intensity higher steel construction composition, for guarantee movable pulley 28 can the steady, movement without bite, on bracket 8 with movable pulley The structure of 28 contacts has carried out grinding process, keeps surface more smooth.

It includes coaling bucket 17, sealing cover 16, weight sensor 19 and support frame 18 that as-fired coal, which accepts system,.It wherein coalings bucket 18, which use open, rectangular, rigid plastics bucket, sees Fig. 6.In order to realize intelligence, take coal automatically, 16 structure of sealing cover is opposite More complex, sealing cover structure is shown in Fig. 5-1,5-2 and 5-3, and sealing cover 16 is by horizontally disposed, horizontally moveable hard plastic board Composition, there are four movable pulley 28 on every piece of hard plastic board, two spring carrier arms 27, and in a side along one small iron block of upper installation 25 can be found in Fig. 5-2, and two pieces of plastic plates can move horizontally on the sealing cover track 29 on support frame 18 sees Fig. 5-4, two side hangings It is connected between hook with spring 26, and arranges that one electromagnetic coil 24 of each arrangement is shown in Fig. 5-on two crossbeams on support frame 18 1, the on-off principle of sealing cover 16 is, when not needing as-fired coal sampling normally, under the lesser pulling force of spring 26, and two pieces of modelings Flitch is close together, and sealing cover 16 is in close state, and state represented by Fig. 5-1 is in off state, when needing to sample, Electromagnetic coil 24 is powered, and generates magnetic force and attracts iron block 25 that electromagnetic coil 24 and iron block 25 are close together, while 26 quilt of spring It stretches, when sampling is completed, the power-off of electromagnetic coil 24 loses magnetic force, since the pulling force of spring 26 makes two pieces of plastic plates lean against one It rises, sealing cover 16 replys closed state again, therefore the type selecting of spring 26 and electromagnetic coil 24 is important, carries out in this case Test of many times ability successful match.(structure of electromagnetic coil and spring used by sealing cover is to reduce material in the program Expect cost, structure is more complicated, and simple method is to directly adopt two fan electric vertical hinged doors) it is to guarantee sealing cover there are also a bit 16 is tighter when coalingging on bucket 17, and rubber seal has been disposed below in sealing cover.

Weight sensor 19, which is arranged on, is used to weigh as-fired coal sample weight collected, weight sensor below bucket of coalingging Precision and range be selected as 0.5 grade and 50kg；Bucket 17 of coalingging is mounted on above weight sensor 19.

Support frame 18 is structure fixed, that bucket 17, sealing cover 16, weight sensor 19 are coaling in support, is divided into two up and down Divide it will be seen from figure 1 that upper part is to be disposed with track and crossbeam, track on support frame 18 for supporting sealing cover 16 Be guarantee driven wheel 21 can moving in parallel without bite, crossbeam is to install electromagnetic coil 24, and lower part is for propping up Support and fixed weight sensor 19, two parts are all directly welded on 1 outer wall of run coal bin, it should be noted that support frame does not have Body technique requirement, as long as can guarantee sufficient intensity according to live physical condition.

In addition the quantity of intelligent as-fired coal acquisition system will be determined according to the quantity of pulverized coal preparation system, but control unit is only It needs a set of, has three sets of pulverized coal preparation systems in the embodiment therefore be mounted with the i.e. every set pulverized coal preparation system of three sets of as-fired coal sampling systems One, three sets of as-fired coal sampling systems share an intelligent control unit.

Control unit is the control system of the as-fired coal sampler, is controlled in this embodiment using PLC, the control list The schematic diagram of member is as shown in Figure 7.Since the coal-fired deviation design coal of current boiler is more, and coal quality is many kinds of, in order to The accuracy of as-fired coal sampling is improved, specific requirement is that coal quality type is more, and sampling number is more；Every set in boiler running process The coal-supplying amount of pulverized coal preparation system is different, and coal-supplying amount is bigger, and sampling number is also more, and coal-supplying amount is less than pulverized coal preparation system minimum and gives When coal amount (embodiment is 20t/h), illustrate that the pulverized coal preparation system is in abnormal operational conditions, such as shutdown process, or stop over Fortune, at this moment need not sample, therefore the sampling number of as-fired coal is the function of one with pulverized coal preparation system coal-supplying amount and coal quality type, F =f (T, H), in function F be the sampling frequency (the present embodiment using time/30 minutes, what needs to be explained here is that, secondary metering can , as taken 0.5kg, or the circle number of the rotation using rotating electric machine every time, such as to use the rotating cycle of rotating electric machine also using weight Need to install additional speed probe, using taking 0.5kg every time in the present embodiment), T is pulverized coal preparation system coal-supplying amount (t/h), and H is Coal quality number of species, coal quality number of species need operations staff to input, and input fed to boiler coal sampling system can start.In the implementation Automatically and manually, under automated manner, operations staff inputs coal quality type to the method for operation there are two types of as-fired coal sampling systems in example After quantity, the sampling system starting sampling sequence of every set pulverized coal preparation system, after continuous sampling, weight sensor 19 issues bucket of coalingging When 17 full signal, sampling sequence stop, and to chemical examination duty room and DCS issue signal, lab technician take out coal sample, after taking by Reset key；When lab technician thinks not needing sampling, reset button can be directly pressed, in duty room, scene and DCS are ok on the spot It resets.Manual mode is exactly to use in performance test or interim sampling, manual mode can in DCS and execute-in-place on the spot, According to sample time and weight start and stop sampling system at any time can be sampled under manual mode.

It is described below, as-fired coal samples sequence under automated manner:

The initial and halted state of as-fired coal sampling system are as follows: move back limit switch 9 and issue signal, isolation baffle plate 2, which is in, closes Closed state, driving motor 6 stop, and rotating electric machine 13 stops, and 24 power loss of electromagnetic coil, sealing cover 16 is in close state, weight Sensor 19 is shown as 0, and for operations staff to input coal quality type, system meets entry condition.Control unit issues sampling instruction, Isolation baffle plate 2 is opened, 24 power transmission of electromagnetic coil, and sealing cover 16 is opened, and rotating electric machine 13 starts, and acquisition bar 10 starts to rotate, and is driven Dynamic motor 7 starts, and moves back 9 blackout of limit switch, and acquisition bar 10 advances in rotation, enters run coal bin by isolation baffle plate 2 1, when issuing signal into limit switch 14, driving motor 7 is out of service, and acquisition bar 10 halts, and takes coal to start, when coalingging When bucket 17 has coal, weight sensor 19 can issue signal, the weight of sampling can all be shown on DCS and on the spot display screen, when one After the completion of a sampling circulation, driving motor 7 starts, and acquisition bar 10 starts to retreat, and signal is lost into limit switch 14, until moving back limit Bit switch 9 issues signal, and driving motor 7 stops, and isolation baffle plate 2 is closed, 24 power loss of electromagnetic coil, and sealing cover 16 is closed, rotation Motor 13 stops, and system is restored to original state, when second sampling circulation starts, sequence of movement above can be repeated, in this reality It applies in example, the maximum coal capacity for bucket 17 of coalingging is 50kg, and when weight sensor 19 issues the signal of 50kg, sampling system can stop Only, and signal is issued to DCS and laboratory to take out coal sample, and press by reset until DCS operations staff or laboratory personnel Button, system are then restored to original state.

Under manual sampling mode, manual sample button is pressed, sampling system enters foregoing sampling state and carries out Sampling, then system stops release button, presses sample button again, and system starts to sample again, and until pressing reset button, then system is extensive Again to original state.

The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (9)

1. a coal sampling system into the furnace, characterized in that the described coal sampling system into the furnace is located on one side of the original coal bunker, and the system comprises: The isolation baffle, the raw coal bunker is provided with an opening, the isolation baffle can be opened and fixed at the opening, and the isolation baffle can be opened according to the set sampling frequency; A collection rod, one end of the collection rod faces the opening and a sampling part is arranged on the collection rod, and the collection rod is connected with a driving mechanism that drives the collection rod to move toward the opening; the collection rod is movably fixed on the bracket, the bracket is fixed with the raw coal bunker, and the collection rod is relative to the bracket The drive mechanism passes through the opening and is sampled by the sampling part and then exits from the opening; a shell, located on one side of the opening; The coal charging mechanism is arranged at the bottom of the casing to receive the coal samples taken out from the raw coal bunker by the sampling components; Sealing cover, the sealing cover is composed of horizontally arranged rigid plastic plates that can move horizontally, each rigid plastic plate has four sliding wheels, two spring hooks, and a small iron block is installed on one side edge, two The plastic plate can move horizontally on the sealing cover track on the support frame, the hooks on both sides are connected by springs, and one electromagnetic coil is arranged on each of the two beams on the support frame. 2. The coal sampling system according to claim 1, wherein the sampling component is a helical blade arranged on the surface of a collection rod, the collection rod is connected with a rotary motor, and the rotation mechanism is provided on the drive plate, The drive board is fixed with the linear drive mechanism. 3. The coal sampling system according to claim 2, wherein the length of the helical blade is half the length of the entire collection rod, wherein the first half of the helical blade is an involute blade. 4. The coal sampling system according to claim 1, characterized in that, there are two sealing covers, the two sealing covers are arranged in half, and a track is arranged on the top of the coal charging mechanism for the sealing covers to move, and the two sealing covers are arranged in opposite directions. One sealing cover is an electromagnetic suction door. 5 . The coal sampling system according to claim 1 , wherein a weight sensor is provided at the bottom of the coal charging mechanism. 6 . 6 . The coal sampling system of claim 1 , wherein an advance limit switch and a retreat limit switch are arranged on the support. 7 . 7 . The coal sampling system of claim 1 , wherein the diameter of the casing gradually decreases from the opening to the diameter of the coal charging mechanism. 8 . 8. The coal sampling system according to claim 4, further comprising a control unit, the control unit is independent of the rotary motor, the linear drive motor, the electromagnetic suction door and the second rotary motor for controlling the opening of the isolation baffle. connect. 9. the using method of the coal sampling system into the furnace as claimed in claim 8, is characterized in that, concrete steps are as follows: 1) After the control system receives the sampling instruction, open the isolation baffle; 2) The control system controls the action of the rotary motor and the linear drive motor to drive the collecting rod to move to the opening of the raw coal bunker; 3) After sampling by the sampling part, the coal falls down through the casing; 4) The control system controls the electromagnetic suction door to open, and after the coal sample falls into the coal loading mechanism, the electromagnetic suction door is closed and the sampling is completed.