Refining coal blending device for coal for gasification

Abstract

The invention belongs to the technical field of coal blending equipment, and particularly relates to a gasification coal refined coal blending device, which comprises a raw coal accurate distribution system, a coal blending system, a coal blending system, a coal blending system, a coal blending system, a coal blending system, a coal blending system, a coal blending system, a coal blending system and a coal blending system, and is characterized in that the raw coal blending system comprises a plurality of raw coal silos and a quantitative feeding assembly, the coal conveying system comprises a conveying belt and a flattening unit, the conveying belt is horizontally arranged between the quantitative feeding assembly and the stirring system, and the flattening unit is arranged on the upper side of the conveying belt and used for flattening raw coal on the conveying belt; the online detection system is used for acquiring coal quality data of industrial components, element components and ash chemical components of each raw coal in the mixed raw coal on the conveying belt; and the central control system is used for comparing the coal quality data obtained by the online detection system with a preset coal quality data range so as to control the coal discharge flow of each raw coal silo in the accurate raw coal distribution system, so that the coal distribution precision is improved, and the coal quality requirement of coal for gasification is met.

Description

Technical Field

[0001] The invention belongs to the technical field of coal blending equipment, and in particular relates to a fine coal blending device for gasification. Background Art

[0002] Coal for gasification refers to coal that can be processed into gas raw materials through chemical processing. The process can be described as the process of converting organic matter in coal into chemical raw gas under certain temperature and pressure conditions. Coal for gasification is usually required to have suitable chemical reaction properties and ash fusibility, ash content and volatile matter that match the gasification equipment, as well as low sulfur content.

[0003] There are many indicators for coal quality used for gasification. For fluidized bed gasifiers, industrial analysis indicators, elemental analysis indicators and ash chemical composition are particularly important for the stability of the gasifier. The good economic performance of gasification technology can be ensured by stabilizing industrial analysis indicators and elemental analysis indicators, and the normal slag discharge of the gasifier can be ensured by analyzing and controlling the ash chemical composition indicators.

[0004] In the existing silo coal blending method, the dry powdered coal is controlled by a vibrating feeder to control the discharge amount, and the flow rate of coal out of the silo is adjusted according to the coal blending ratio required by the user and the actual reading of the electronic belt scale. Multiple coals are transported to the finished coal bin through their respective belt conveyors to complete the coal blending. In the related art, due to the requirements of coal quality for gasification coal, it is necessary to accurately control the coal quality of the blended coal. For example, the invention patent with publication number CN112009998B discloses a coal blending device and system for industrial production. The invention only considers the ash parameters of the coal quality, and has low requirements for the coal quality of the blended coal. The coal quality index parameters of the blended coal are single, which does not meet the demand for coal for gasification. For another example, the invention patent with publication number CN108671848B discloses an automatic coal blending control system and a coal blending method thereof. In the coal blending process, the data analysis of the coal samples is carried out by random sampling. Although it can realize the analysis of multiple coal quality indicators compared with the coal blending method provided by patent CN112009998B, the random sampling analysis is a point-by-point generalization of coal quality assessment, and it is impossible to grasp the coal quality indicators of the coal blending in real time, and the raw coal delivery volume is adjusted in time according to the coal quality fluctuation, which makes it difficult to meet the coal quality requirements for gasification coal. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a refined coal blending device for gasification, which can detect coal quality data in real time during the coal blending process, adjust the proportion of each raw coal in real time, and effectively grasp the precise indicators of the blended coal quality, ensuring that the coal quality data of the configured coal is more accurate and stable, and meets the coal quality requirements for gasification.

[0006] The technical solution of the present invention is:

[0007] A device for finely blending coal for gasification, comprising a stirring system, and further comprising:

[0008] A raw coal precise distribution system, comprising a plurality of raw coal silos for storing different types of raw coal and a quantitative feeding assembly arranged in one-to-one correspondence with the plurality of raw coal silos, wherein the quantitative feeding assembly is arranged at the discharge port of the raw coal silo and is used to control the coal discharge flow of the raw coal silo;

[0009] The coal conveying system comprises a conveying belt and a flattening unit, wherein the conveying belt is horizontally arranged between the quantitative feeding assembly and the stirring system, and the flattening unit is arranged on the upper side of the conveying belt, and the flattening unit is used to flatten the raw coal on the conveying belt;

[0010] An online detection system is arranged on a side of the paving unit close to the stirring system and located above the conveyor belt, and the online detection system is used to respectively obtain the coal quality data of the industrial composition, elemental composition and ash chemical composition of the raw coal output by each of the raw coal silos;

[0011] The central control system is electrically connected to the raw coal precise distribution system and the online detection system, respectively, and is used to compare the coal quality data obtained by the online detection system with the preset coal quality data range, so as to control the coal flow rate of each raw coal silo in the raw coal precise distribution system.

[0012] Preferably, the quantitative feeding assembly includes a vibrating screen feeder and a weighing module, the inlet of the vibrating screen feeder is connected to the discharge port of the raw coal silo, and the outlet is placed above the conveyor belt. The weighing module is arranged at the outlet of the vibrating screen feeder, and is used to measure the coal output of the vibrating screen feeder per unit time. The vibrating screen feeder and the weighing module are both electrically connected to the central control system, and the central control system is used to adjust the vibration frequency of the vibrating screen feeder through the measurement value fed back by the weighing module, so as to realize coal output flow control.

[0013] Preferably, the weighing module includes a gravity sensor and a guide plate, the guide plate is tilted at the outlet of the vibrating screen feeder, and the upper end of the guide plate in the tilting direction is rotatably connected to the vibrating screen feeder, and the lower end in the tilting direction abuts against the detection end of the gravity sensor, and the gravity sensor is fixed to the vibrating screen feeder through a connecting plate, the gravity sensor is electrically connected to the central control system, and the gravity sensor can be used to feed back the measured weight data to the central control system in real time to adjust the vibration frequency of the vibrating screen feeder.

[0014] Preferably, the flattening unit includes a height limit plate, which is arranged along the width direction of the conveyor belt, and the width of the height limit plate is the same as the width of the conveyor belt, both ends of the height limit plate are fixed to the equipment frame, the bottom surface of the height limit plate is parallel to the conveyor belt, and the bottom of the height limit plate is lower than the detection end of the online detection system; the height limit plate can be used to level the raw coal on the conveyor belt before entering the area of ​​the online detection system, so that the online detection system can more accurately obtain the raw coal quality data, facilitate accurate adjustment of the proportion of each raw coal, and ultimately meet the standards for gasification coal.

[0015] Preferably, the leveling unit also includes a coal turning assembly, and the coal turning assembly is arranged on a side of the height limit plate away from the online detection system, and the coal turning assembly includes a motor and a coal turning plate; the motor is arranged on one side in the width direction of the conveyor belt and is fixedly connected to the equipment frame; the coal turning plate is fixedly connected to the output shaft of the motor, and the length of the coal turning plate is the same as the width of the conveyor belt, the lowest point of the coal turning plate's turning movement is lower than the top of the height limit plate, and the highest point of the coal turning movement is higher than the top of the height limit plate. The coal turning assembly can be used to further lower the height of the stacked raw coal or preliminarily disperse it evenly before the height limit plate levels the raw coal, so that the coal material can be better leveled under the action of the height limit plate, which is convenient for the coal quality data detection of the online detection system.

[0016] Preferably, the online detection system includes a radiation type coal sample detector arranged in one-to-one correspondence with a plurality of raw coal silos, the plurality of radiation type coal sample detectors are fixed to the equipment frame through a mounting plate, and the plurality of radiation type coal sample detectors are arranged in parallel along the width direction of the conveyor belt, the radiation type coal sample detector has a detection port, and the detection port is higher than the leveled coal sample, and the detection port is used to obtain the coal quality data of the industrial composition, elemental composition and ash chemical composition of the raw coal output from the corresponding raw coal silo.

[0017] Preferably, the detection travel of the ray-type coal sample detector on the conveyor belt is 1m-2m, so that the content of relevant coal quality indicators in each raw coal can be detected more accurately.

[0018] Preferably, the coal quality data detected by the ray-type coal sample detector includes:

[0019] industrial composition, including moisture, ash, volatile matter, and fixed carbon;

[0020] elemental composition, including carbon, hydrogen, and nitrogen;

[0021] Ash chemical composition includes SiO2, Al2O3, CaO, Fe2O3, MgO, K2O, Na2O, and TiO2.

[0022] Compared with the prior art, the device for finely blending coal for gasification of the present invention has the following beneficial effects:

[0023] The device is configured by the mutual coordination of the raw coal precise distribution system, the coal conveying system, the online detection system, the central control system and the stirring system. During the coal distribution process, the central control system collects the coal quality data of the industrial composition, elemental composition and ash chemical composition of the raw coal on the conveyor belt in real time through the online detection system, and compares it with the preset coal quality data range; after obtaining the comparison result, the central control system uses the weighing module at the bottom of each raw material silo to continuously obtain the real-time discharge weight of the quantitative feeding component, and then adjusts the coal discharge flow rate of the corresponding quantitative feeding component to achieve real-time and accurate control of the proportion adjustment of each raw coal, so as to ensure that the quality of the prepared coal meets the working requirements of the gasifier; thereby solving the technical problem of unstable operation of the gasifier caused by the uncertain coal distribution composition due to the existing sampling detection and empirical coal distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall layout structure in an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the coal blending operation process in an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the coal turning assembly in an embodiment of the present invention.

[0027] Explanation of the reference numerals: 1. Raw coal precise distribution system; 2. Coal conveying system; 3. Online detection system; 4. Mixing system; 5. Central control system; 6. Raw coal silo; 7. Gravity sensor; 8. Vibrating screen feeder; 9. Bracket; 10. Conveyor belt; 11. Coal turning assembly; 12. Leveling unit; 13. X-ray coal sample detector. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0030] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] See also Figures 1 to 3 As shown, in order to be able to detect the coal quality data in real time during the coal blending process and adjust the proportion of each raw coal in real time, the precise indicators of the coal quality of the blended coal can be effectively grasped to ensure that the coal quality data of the configured coal is more accurate and stable, and meets the coal quality requirements of gasification coal. The present embodiment provides a refined coal blending device for gasification, including an equipment frame, on which a stirring system 4, a raw coal precise distribution system 1, a coal conveying system 2, an online detection system 3 and a central control system 5 are respectively arranged. The raw coal precise distribution system 1, the coal conveying system 2, the online detection system 3 and the stirring system 4 are connected and arranged in sequence, and the raw coal precise distribution system 1, the coal conveying system 2, the online detection system 3 and the stirring system 4 are respectively electrically connected to the central control system 5, and the operation control between the components is realized through the central control system 5. The details are as follows:

[0032] The raw coal precise distribution system 1 includes a plurality of raw coal silos 6 for storing different types of raw coal and quantitative feeding components corresponding to the plurality of raw coal silos 6. The raw coal silos 6 are fixedly mounted on the equipment frame and are used to store raw coal materials in a dry powder state. The quantitative feeding component is arranged at the discharge port of the raw coal silo 6 to control the coal discharge flow rate of the raw coal silo 6; the quantitative feeding component includes a weighing module and a vibrating screen feeder 8. The weighing module is arranged at the discharge port of the vibrating screen feeder 8. The vibrating screen feeder 8 can be used to quickly adjust the coal discharge flow rate of the raw material silo, and the weighing module can be used to feed back the real-time coal discharge weight of the vibrating screen feeder 8 to the central control system 5 in real time.

[0033] The coal conveying system 2 includes a belt conveyor and a flattening unit 12. The belt conveyor consists of a conveying belt 10 and a driving component. The conveying belt 10 is horizontally arranged between the quantitative feeding assembly and the stirring system 4 through a bracket 9. The conveying belt 10 realizes transmission operation through the driving component. Preferably, multiple raw material silos are arranged in sequence along the width direction of the conveying belt 10. The flattening unit 12 is arranged on the upper side of the conveying belt 10. The flattening unit 12 is used to comb and flatten the raw coal on the conveying belt 10 to ensure that the subsequent online detection system 3 can accurately detect and analyze the coal quality data.

[0034] The online detection system 3 is arranged on the side of the flattening unit 12 close to the stirring system 4 and is located above the conveyor belt 10. The online detection system 3 includes a plurality of detection ports corresponding to the raw coal silos 6. Each detection port is used to obtain the coal quality data of the industrial composition, elemental composition and ash chemical composition of the raw coal outputted from the corresponding raw coal silo 6; wherein the industrial composition includes moisture, ash, volatile matter, and fixed carbon; the elemental composition includes carbon, hydrogen, and nitrogen; and the ash chemical composition includes SiO2, Al2O3, CaO, Fe2O3, MgO, K2O, Na2O, and TiO2. The central control system 5 is electrically connected to the raw coal precise distribution system 1 and the online detection system 3 respectively, and is used to compare the coal quality data obtained by the online detection system 3 with the preset coal quality data range, so as to control the coal output flow rate of each raw coal silo 6 in the raw coal precise distribution system 1.

[0035] The stirring system 4 is arranged at one end of the conveyor belt 10. The stirring system 4 adopts a continuous stirring main machine. The configured raw coal will all enter from the feeding port of the continuous stirring main machine to achieve uniform mixing of the coal materials, which is convenient for the subsequent use of coal for gasification.

[0036] See also Figure 1 As shown, the inlet of the vibrating screen feeder 8 is connected to the discharge port of the raw coal silo 6, the outlet of the vibrating screen feeder 8 is placed above the conveyor belt 10, and the vibrating screen feeder 8 is electrically connected to the central control system 5. The central control system 5 is used to compare the coal quality data obtained in real time by the online detection system 3 with the preset target coal quality data, so as to realize real-time adjustment of the vibration frequency of the vibrating screen feeder 8, so as to control the amount of coal delivered by the vibrating screen feeder 8 to the conveyor belt 10 in real time.

[0037] See also Figure 1As shown, further, in order to improve the accuracy of coal blending. The weighing module includes a guide plate and a gravity sensor 7, the guide plate is tilted at the outlet of the vibrating screen feeder 8, and the upper end of the guide plate in the tilt direction is rotatably connected to the vibrating screen feeder 8, and the lower end in the tilt direction is abutted against the detection end of the gravity sensor 7, and the gravity sensor 7 is fixed to the vibrating screen feeder 8 through a connecting plate, so that when the vibrating screen feeder 8 discharges, the coal flows to the conveyor belt 10 through the guide plate. At this time, the pressure change provided by the guide plate to the gravity sensor 7 can be used to measure the coal output of the vibrating screen feeder 8 per unit time in real time. Generally, the measurement unit time of the gravity sensor 7 is generally set to 1 second, that is, the gravity sensor 7 can be used to measure the weight of the vibrating screen feeder 8 per second, which can effectively improve the configuration accuracy. The gravity sensor 7 is then electrically connected to the central control system 5 to feed back the measured weight data to the central control system 5 in real time, so that the central control system 5 can adjust the vibration frequency of the vibrating screen feeder 8 by coordinating with the coal quality data detected by the online detection system 3, thereby achieving real-time control of the precise proportion of each raw coal. Preferably, the gravity sensor can also be replaced by a pressure sensor or other weighing sensor.

[0038] See also Figure 3 As shown, further, in order to improve the accuracy of coal blending. The flattening unit 12 includes a height limit plate, which is arranged along the width direction of the conveyor belt 10, and the width of the height limit plate is the same as the width of the conveyor belt 10. Both ends of the height limit plate are fixed to the equipment frame, and the bottom surface of the height limit plate is parallel to the conveyor belt 10, and the bottom of the height limit plate is lower than the detection end of the online detection system. The height limit plate can be used to flatten the raw coal on the conveyor belt 10 before entering the area of ​​the online detection system 3, so that the online detection system 3 can more accurately obtain the collection of raw coal quality data, which is convenient for accurately adjusting the proportion of each raw coal, and finally reaching the standard of coal for gasification.

[0039] See also Figure 3As shown, further, in order to improve the accuracy of coal blending. The flattening unit 12 also includes a coal turning assembly 11, which is arranged on the side of the height limit plate away from the online monitoring system 3, and the coal turning assembly 11 includes a motor and a coal turning plate, the motor is arranged on one side of the width direction of the conveyor belt 10 and is fixedly connected to the equipment frame; the coal turning plate is fixedly connected to the output shaft of the motor, the length of the coal turning plate is the same as the width of the conveyor belt 10, the lowest point of the coal turning plate turning movement is lower than the top of the height limit plate, and the highest point of the coal turning plate turning movement is higher than the top of the height limit plate. Since the raw coal may accumulate when it falls on the conveyor belt 10 from the discharge port of the vibrating screen feeder 8, in order to prevent the accumulated raw coal from overflowing from the top of the height limit plate to the side of the online detection system 3 during the process of being leveled by the height limit plate, thereby affecting the detection accuracy of the online detection system 3, the coal turning assembly 11 is matched with the height limit plate, so that the coal turning assembly 11 can further lower the height or preliminarily disperse the accumulated raw coal before the height limit plate levels the raw coal, so that it can be better leveled under the action of the height limit plate, which is convenient for the coal quality data detection of the online detection system 3.

[0040] See also Figure 1 As shown, further, in order to improve the accuracy of coal blending. The online detection system 3 includes a radiation type coal sample detector 13 corresponding to a plurality of raw coal silos 6, and the plurality of radiation type coal sample detectors 13 are fixed by a mounting plate and an equipment frame. The mounting plate is located on the upper side of the conveyor belt 10, and the plurality of radiation type coal sample detectors 13 are fixed on the side of the mounting plate facing the conveyor belt 10. The radiation type coal sample detector 13 has a detection port, and the detection port is higher than the leveled coal sample. The detection port is used to obtain the industrial composition, elemental composition and ash chemical composition of the raw coal output by the corresponding raw coal silo 6. The detection value of the radiation type coal sample detector 13 during use is the average value of the surface coal sample value. When the transmission system switches the coal material, the radiation type coal sample detector 13 needs to stop running before the coal quality is stably transmitted. In order to improve the detection accuracy of the coal quality data, it is preferable to set the detection stroke of the radiation type coal sample detector 13 on the conveyor belt 10 to 1m-2m.

[0041] The online detection system 3 and the raw coal precise distribution system 1 are electrically connected to the central control system 5. The central control system 5 is a computer that integrates data storage, calculation, condition judgment and command issuance. Before coal blending, the coal blending plan formulated according to the coal material, coal quality and required coal quality indicators is input into the central control system 5 according to the preset corresponding to each indicator, and then coal blending is carried out. The specific control steps are as follows: ① Obtain industrial analysis (moisture, ash, volatile matter and fixed carbon), elemental analysis (carbon, hydrogen, nitrogen) and ash chemical composition (SiO2, Al2O3, CaO, Fe2O3, MgO, K2O, Na2O, TiO2) data through the online detection system 3, obtain coal output data from the gravity sensor 7, and compare the preset coal quality range of the coal blending after calculation based on the coal output and coal quality data; ② Exceeding the range The central control system 5 issues instructions to the raw coal precise distribution system 1 according to the vibration frequency of the vibrating screen feeder 8 and the calibration data of the raw coal output, increasing or decreasing the vibration frequency of the vibrating screen feeder 8 to control the coal output per second; repeating the processes ① and ② makes the coal quality reach the preset coal quality range. When the coal material changes, the various indicators input into the central control system 5 need to be modified according to the new coal blending plan.

[0042] In order to improve the coal quality accuracy of coal blending to meet the requirements of gasification coal, the device can further set multiple conveyor belts 10, each conveyor belt 10 corresponds to a raw material silo, and is used to transport a raw material separately, and then a flattening unit 12, a coal turning component 11 and an online detection system 3 are respectively arranged on each conveyor belt 10. In this way, it can be avoided that the adjacent raw coals are contacted and mixed during the detection process, which affects the accuracy of the online detection system 3 in coal quality detection.

[0043] The working principle of this device is as follows: the required raw coal powder is placed in the raw coal silo 6 respectively, and the flow rate of the raw coal powder in each raw silo to the conveyor belt 10 is adjusted by the vibrating screen feeder 8 respectively, and the discharge flow rate is measured in real time by the gravity sensor 7 and transmitted to the central control system 5. Then, different raw coal powders are driven by the conveyor belt 10 to pass through the coal turning assembly 11, the flattening unit 12 and the online detection system 3. The online detection system 3 is mainly used to detect the industrial composition (water content, ash content, volatile matter, fixed carbon), elemental composition (carbon, hydrogen, nitrogen) and ash chemical composition (SiO2, Al2O3, CaO, Fe2O3, MgO, K2O, Na2O, T iO2), etc., transmit the detected data to the central control system 5, and compare it with the preset target coal quality index range through the central control system 5, and then the central control system 5 feeds back the comparison result to the raw coal precise distribution system 1, and uses the feedback data and the combination of gravity sensor 7 to control the vibration frequency of the vibrating screen feeder 8 on each raw coal silo 6. The vibration frequency of the vibrating screen feeder 8 can be adjusted to control the coal output per unit time of the raw coal powder on the conveyor belt 10, so as to accurately control the required coal quality index and meet the coal demand for gasification. The raw coal powder passing through the online detection system 3 is sent to the stirring device by the conveyor belt 10 for uniform mixing.

[0044] In summary, this device can also quickly and accurately mix several coal products, so that high-quality coal can be fully gasified, the gasification efficiency of coal blending can be improved, the waste of high-quality coal in the coal blending process can be reduced, and it has the characteristics of good social benefits.

[0045] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A device for finely blending coal for gasification, comprising a stirring system (4), characterized in that: Also includes: A raw coal precise distribution system (1) comprises a plurality of raw coal silos (6) for storing different types of raw coal and quantitative feeding components arranged in one-to-one correspondence with the plurality of raw coal silos (6), wherein the quantitative feeding components are arranged at the discharge ports of the raw coal silos (6) and are used to control the coal discharge flow rate of the raw coal silos (6); A coal conveying system (2), comprising a conveying belt (10) and a flattening unit (12), wherein the conveying belt (10) is horizontally arranged between the quantitative feeding assembly and the stirring system (4), and the flattening unit (12) is arranged on the upper side of the conveying belt (10), and the flattening unit (12) is used to flatten the raw coal on the conveying belt (10); An online detection system (3) is arranged on a side of the flattening unit (12) close to the stirring system (4) and located above the conveyor belt (10), and the online detection system (3) is used to respectively obtain coal quality data of industrial composition, elemental composition and ash chemical composition of the raw coal output by each of the raw coal silos (6); The central control system (5) is electrically connected to the raw coal precise distribution system (1) and the online detection system (3) respectively, and is used to compare the coal quality data obtained by the online detection system (3) with a preset coal quality data range, thereby controlling the coal output flow of each raw coal silo (6) in the raw coal precise distribution system (1).

2. The device for finely blending coal for gasification according to claim 1, characterized in that: The quantitative feeding assembly comprises a vibrating screen feeder (8) and a weighing module. The inlet of the vibrating screen feeder (8) is connected to the discharge port of the raw coal silo (6), and the outlet is placed above the conveyor belt (10). The weighing module is arranged at the outlet of the vibrating screen feeder (8) and is used to measure the coal output of the vibrating screen feeder (8) per unit time. The vibrating screen feeder (8) and the weighing module are both electrically connected to the central control system (5). The central control system (5) is used to adjust the vibration frequency of the vibrating screen feeder (8) through the measurement value fed back by the weighing module, so as to realize the coal output flow control.

3. The device for finely blending coal for gasification according to claim 2, characterized in that: The weighing module comprises a gravity sensor (7) and a guide plate, wherein the guide plate is arranged obliquely at the outlet of the vibrating screen feeder (8), and the upper end of the guide plate in the oblique direction is rotatably connected to the vibrating screen feeder (8), and the lower end in the oblique direction abuts against the detection end of the gravity sensor (7), and the gravity sensor (7) is fixed to the vibrating screen feeder (8) via a connecting plate, and the gravity sensor (7) is electrically connected to the central control system (5).

4. The device for finely blending coal for gasification according to claim 1, characterized in that: The flattening unit (12) comprises a height limiting plate, which is arranged along the width direction of the conveyor belt (10), and the width of the height limiting plate is the same as the width of the conveyor belt (10), the bottom surface of the height limiting plate is parallel to the conveyor belt (10), and the bottom of the height limiting plate is lower than the detection end of the online detection system (3).

5. The device for finely blending coal for gasification according to claim 4, characterized in that: The flattening unit (12) further comprises a coal turning assembly (11), wherein the coal turning assembly (11) is arranged on a side of the height limiting plate away from the online detection system (3), and the coal turning assembly (11) comprises: A motor is arranged on one side in the width direction of the conveyor belt (10); A coal turning plate is fixedly connected to the output shaft of the motor, the length of the coal turning plate is the same as the width of the conveyor belt (10), the lowest point of the turning movement of the coal turning plate is lower than the top of the height limiting plate, and the highest point of the turning movement of the coal turning plate is higher than the top of the height limiting plate.

6. The device for finely blending coal for gasification according to claim 1, characterized in that: The online detection system (3) comprises a radiation type coal sample detector (13) which is arranged in one-to-one correspondence with a plurality of raw coal silos (6); the plurality of radiation type coal sample detectors (13) are arranged in parallel along the width direction of the conveyor belt (10); the radiation type coal sample detector (13) has a detection port, and the detection port is higher than the leveled coal sample; the detection port is used to obtain coal quality data of industrial composition, elemental composition and ash chemical composition of the raw coal output by the corresponding raw coal silo (6).

7. The device for finely blending coal for gasification according to claim 6, characterized in that: The detection travel of the ray-type coal sample detector (13) on the conveyor belt (10) is 1m-2m.

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