Coal-fired boiler system and coal-fired boiler ash removal method used for coal-fired boiler system

Abstract

The invention discloses a coal-fired boiler system and a coal-fired boiler ash removal method used for the coal-fired boiler system.The coal-fired boiler system comprises a combustion device, an ash removal device, a coal quality fast detection device and an ash removal control device, the combustion device comprises an air powder pipe and a boiler, and the air powder pipe is used for conveying a pulverized coal and air mixture into the boiler; the ash removal device comprises an ash hopper which is used for storing coal ash generated after boiler combustion. A coal quality detection analyzer of the quick coal quality detection device is connected to the pulverized coal pipe and is used for acquiring the basic ash content of a pulverized coal and air mixture in the pulverized coal pipe; the ash removal control device is electrically connected between the coal quality rapid detection device and the ash removal device, and the ash removal control device obtains the ash amount of the ash bucket according to the basic ash content so as to control the ash removal device to remove the ash bucket. According to the coal-fired boiler system, the ash amount in the ash hopper is accurately predicted, and the ash removal device can actively clean the ash hopper according to the content of coal ash in the ash hopper so as to adjust the operation cycle of the ash removal device, so that the optimal ash removal benefit is achieved, and energy waste and equipment loss are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of ash removal of coal-fired power generation sets, and in particular to a coal-fired boiler system and a coal-fired boiler ash removal method used therefor. Background Art

[0002] In the related art, some power plants adopt the automatic control method of the material level of the ash removal system. The automatic program start condition is the high material level signal in the dust collector ash hopper, and the end condition is the low material level signal. This solves the problem of ash hopper without material and ash conveying running idle, which wastes compressed air. However, the use of high and low material level signals to make logical judgments on the start and stop of the ash removal system is limited by the reliability and accuracy of the material level meter signal, and is prone to failure, resulting in paralysis of the ash removal system. The ash removal system of some power plants is mainly based on time control, and the ash level parameters are used as a reference. In order to avoid accidents such as the ash hopper full of ash bracket being bent and deformed, and the silo pump ash pipe being blocked, the ash removal single process time is generally shortened, which results in low efficiency of the ash conveying system. The amount of material dropped in the silo pump mainly depends on the amount of ash in the upper ash hopper. When there is more ash in the ash hopper, the silo pump can be fully pumped. When there is little ash in the ash hopper, the silo pump is basically in an empty pump operation, wasting a lot of compressed air and energy; in addition, the inlet and outlet valves are also frequently operated in an inefficient state, shortening the service life and increasing the maintenance. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a coal-fired boiler system, which accurately predicts the amount of ash in the ash hopper, and the ash removal device can actively clean the ash hopper according to the content of coal ash in the ash hopper, so as to adjust the operation cycle of the ash removal device to achieve the optimal ash removal efficiency and avoid energy waste and equipment loss.

[0004] The present invention also provides a coal-fired boiler ash removal method for a coal-fired boiler system.

[0005] According to the first aspect of the present invention, the coal-fired boiler system includes: a combustion device, the combustion device includes an air-powder pipe and a boiler, the air-powder pipe is connected to the boiler, and is used to convey a coal-powder-air mixture into the boiler; an ash removal device, the ash removal device is connected to the boiler, the ash removal device includes an ash hopper, and the ash hopper is used to store coal ash after combustion in the boiler; a coal quality rapid inspection device, the coal quality rapid inspection device includes a coal quality detection analyzer, the coal quality detection analyzer is connected to the air-powder pipe, and is used to obtain the basic ash content of the coal-powder-air mixture in the air-powder pipe; an ash removal control device, the ash removal control device is electrically connected between the coal quality rapid inspection device and the ash removal device, and the ash removal control device obtains the ash amount in the ash hopper according to the basic ash content to control the ash removal device to clear the ash hopper.

[0006] According to the coal-fired boiler system of the embodiment of the present invention, the basic ash content of coal powder is obtained by a coal quality rapid testing device, and the coal ash content in the ash hopper within a certain period of time is calculated based on the basic ash content of coal powder. The content of coal ash collected in the ash hopper can be accurately predicted, so that the ash removal device can actively clean the ash hopper according to the coal ash content in the ash hopper, so as to adjust the operation cycle of the ash removal device to achieve the optimal ash removal efficiency and avoid energy waste and equipment loss.

[0007] According to some embodiments of the present invention, the coal quality rapid inspection device also includes: a coal powder sampling tube and a gas-powder separator, the coal powder sampling tube is connected between the air-powder tube and the gas-powder separator, the gas-powder separator is connected to the coal quality detection analyzer, and the gas-powder separator is used to separate the coal powder in the coal powder-air mixture.

[0008] According to some embodiments of the present invention, the coal quality rapid testing device further comprises: a sample storage device, the sample storage device being connected between the gas-powder separator and the coal quality testing analyzer, and the sample storage device being used to store the coal powder.

[0009] According to some embodiments of the present invention, the coal quality rapid testing device further comprises: a discarded sample return pipe, one end of which is connected to both the sample storage device and the coal quality testing analyzer, and the other end of which is connected to the boiler.

[0010] According to some embodiments of the present invention, there are multiple coal powder sampling tubes, and in the conveying direction of the air-powder tube, the multiple coal powder sampling tubes are connected with the air-powder tube in sequence, and a valve is provided between the coal powder sampling tube and the gas-powder separator, and the valve includes multiple air inlet holes and air outlet holes, and the multiple air inlet holes correspond one-to-one to and are connected with the multiple coal powder sampling tubes, and the air outlet holes are connected with the gas-powder separator, and the air outlet holes are connected with at least one of the air inlet holes.

[0011] According to some embodiments of the present invention, it further includes: a coal quality rapid inspection industrial control computer, and the coal quality rapid inspection industrial control computer is used to control the operation of the coal quality rapid inspection device.

[0012] According to the coal-fired boiler ash removal method of the second aspect of the present invention, which is used in the coal-fired boiler system of the first aspect of the present invention, the coal-fired boiler ash removal method includes: step S1: the coal quality quick detection device obtains the basic ash content of the coal powder in the air-powder pipe; step S2: the ash removal control device obtains the ash amount in the ash hopper according to the basic ash content of the coal powder in step S1; step S3: when the ash amount in the ash hopper reaches a preset ash amount, the ash removal control device controls the ash removal device to clear the ash hopper.

[0013] According to the coal-fired boiler ash removal method of the embodiment of the present invention, the ash amount in the ash hopper can be predicted in real time, and after the ash amount reaches the preset ash amount, the ash hopper can be automatically cleaned, thereby improving the timeliness of cleaning the ash hopper to achieve the optimal ash removal efficiency and avoid energy waste and equipment loss.

[0014] According to some embodiments of the present invention, the ash removal device includes an electric field ash remover, the ash hopper includes a plurality of economizer ash hoppers and a plurality of electric field ash hoppers, and the plurality of electric field ash hoppers are all connected to the electric field ash remover, and step S2 includes:

[0015] The ash volume of each economizer ash hopper meets: M 0 =B×A ar ×a 0 / n 0

[0016] The electric field ash hopper has i, i is an integer from 1 to 5, and the ash volume of each electric field ash hopper satisfies: M i =B×A ar ×(1-a 0 )×b i / n i

[0017] Wherein, B is the hourly coal consumption of the boiler; A ar The basic ash content of the coal powder obtained by the coal quality quick detection device; a 0 b is the proportion of ash collected by the economizer ash hopper; i The ratio of the ash volume collected by the i-th electric field ash hopper to the total ash volume collected by the electric field ash remover; n 0 is the number of economizer ash hoppers; n i is the number of the electric field ash hoppers of the electric field ash remover; M 0 M is the ash amount in the economizer ash hopper; i is the ash amount of the corresponding i-th electric field ash hopper.

[0018] According to some embodiments of the present invention, the electric field dust collector is a double-chamber five-electric field dust collector.

[0019] The ash volume of each electric field ash hopper meets: M i =B×A ar ×(1-a 0 )×b i ×0.5 / n i .

[0020] According to some embodiments of the present invention, the step S3 includes: when the ash amount in one of the ash hoppers reaches a preset ash amount, the ash removal control device controls the ash removal device to clear the corresponding ash hopper.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a schematic diagram of a coal-fired boiler system according to some embodiments of the present invention;

[0024] Figure 2 is a specific schematic diagram of a coal-fired boiler system according to some embodiments of the present invention;

[0025] Figure 3 is a schematic diagram of a coal quality rapid detection device according to some embodiments of the present invention;

[0026] Figure 4 is a flow chart of a coal-fired boiler ash removal method according to some embodiments of the present invention.

[0027] Reference numerals:

[0028] 1. Air-powder pipe; 2. Coal quality rapid inspection device; 3. Abandoned sample return pipe; 4. Boiler; 5. Electric field ash remover; 6. Economizer ash hopper; 7. Electric field ash hopper; 8. Raw ash bin; 9. Coarse ash bin; 10. Fine ash bin; 11. Ash removal control device; 12. Coal powder sampling tube; 13. Valve; 14. Gas-powder separator; 15. Sample storage device; 16. Coal quality detection analyzer; 17. Coal quality rapid inspection industrial computer. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Reference below Figure 1-Figure 4 A coal-fired boiler system according to an embodiment of the present invention is described.

[0033] According to the coal-fired boiler system of the first aspect of the embodiment of the present invention, the coal-fired boiler system includes a combustion device, an ash removal device, a coal quality rapid detection device 2 and an ash removal control device 11. The coal quality rapid detection device 2 is used to detect the relevant parameters of the coal powder required to be burned by the combustion device, including: calorific value, ash content, volatile matter, moisture, etc., and calculate the basic ash content of the coal powder; the ash removal control device 11 controls the ash removal device to remove the coal ash after the combustion of the combustion device. Specifically, the ash removal control device 11 can calculate the content of coal ash after the combustion of the combustion device according to the basic components of the coal powder measured by the coal quality rapid detection device 2, and is used to adjust the conveying frequency, interval and working time of the ash removal device. The ash removal control device 11 has functions such as information processing, storage, and distribution.

[0034] The combustion device includes an air-powder pipe 1 and a boiler 4. The air-powder pipe 1 is connected to the boiler 4 and is used to transport a coal powder-air mixture into the boiler 4. The air-powder pipe 1 is a first-level air-powder pipe 1, which is an insulated metal pipe for transporting the coal powder and hot air mixture into the boiler; the first-level air-powder pipe 1 contains a mixture of first-level air and coal powder, which is transported to the boiler 4 in equal proportions, and is burned in the boiler 4 to heat water to high-temperature and high-pressure steam. After combustion, the coal powder will produce coal ash, which flows out through the flue, and the flue is connected to the ash hopper. The coal ash is deposited in the ash hopper, and the ash hopper is connected to the ash bin. The ash removal device cleans the coal ash into the ash bin according to the coal ash content in the ash hopper.

[0035] Specifically, the ash removal device includes an electric field ash remover 5, the electric field ash remover 5 is connected to the flue, the ash hopper includes multiple economizer ash hoppers 6 and multiple electric field ash hoppers 7, the ash bin includes a raw ash bin 8, a coarse ash bin 9 and a fine ash bin 10, multiple economizer ash hoppers 6 are connected to the raw ash bin 8 and the coarse ash bin 9, and the electric field ash hopper 7 is connected to the raw ash bin 8, the coarse ash bin 9 and the fine ash bin 10. The raw ash bin 8 is one of the three ash bins set up in the coal-fired power plant, and is mainly used to store the coarse ash transported from the economizer ash hopper 6 and the coarse ash transported from the electric field ash hopper 7; the coarse ash bin 9 is one of the three ash bins set up in the coal-fired power plant, and is similar to the raw ash bin 8, and is mainly used to store the coarse ash transported from the economizer ash hopper 6 and the coarse ash transported from the electric field ash hopper 7, and also serves as a backup ash bin for the raw ash bin 8 and the fine ash bin 10; the fine ash bin 10 is one of the three ash bins set up in the coal-fired power plant, and is mainly used to store the fine ash transported from the electric field ash hopper 7.

[0036] The economizer ash hopper 6 is located in the flue, and part of the flue gas naturally settles down and enters the economizer ash hopper 6, and the coal ash in the economizer ash hopper 6 is transported to the raw ash bin 8 or the coarse ash bin 9 through the ash removal device; part of the flue gas enters the electric field ash collector 5, and the electric field ash collector 5 collects the coal ash in the flue gas and enters the electric field ash hopper 7, and the coal ash is transported to the raw ash bin 8 or the coarse ash bin 9 or the fine ash bin 10 through the ash removal device.

[0037] The coal quality rapid inspection device 2 includes a coal quality detection analyzer 16, which is connected to the air-powder pipe 1 and is used to obtain the basic ash content of the coal-powder-air mixture in the air-powder pipe 1. The coal quality detection analyzer 16 can obtain the basic ash content of the coal powder by detecting the coal-powder-air mixture; the coal quality rapid inspection device 2; uploads the obtained basic ash content to the ash removal control device 11, and the ash removal control device 11 calculates the coal ash content of each ash hopper within a certain period of time according to the basic ash content. When the coal ash content in the ash hopper reaches the preset ash amount, the ash removal control device 11 controls the ash removal device to work, so as to remove the coal ash in the corresponding ash hopper and clean the coal ash into the ash bin.

[0038] By obtaining the basic ash content of coal powder through the coal quality rapid testing device 2, and relying on the basic ash content of coal powder to calculate the content of coal ash in the ash hopper within a certain period of time, the content of coal ash collected in the ash hopper can be accurately predicted, so that the ash removal device can actively clean the ash hopper according to the content of coal ash in the ash hopper, so that the operation of the ash removal system is changed from a passive adaptation state to an active adjustment state, so as to adjust the operation cycle of the ash removal device to achieve the optimal ash removal efficiency and avoid energy waste and equipment loss.

[0039] According to the coal-fired boiler system of the embodiment of the present invention, the basic ash content of the coal powder is obtained by the coal quality rapid detection device 2, and the coal ash content in the ash hopper within a certain period of time is calculated based on the basic ash content of the coal powder. The content of the coal ash collected in the ash hopper can be accurately predicted, so that the ash removal device can actively clean the ash hopper according to the coal ash content in the ash hopper, so as to adjust the operation cycle of the ash removal device to achieve the optimal ash removal efficiency and avoid energy waste and equipment loss.

[0040] According to some embodiments of the present invention, referring to Figure 1 , Figure 3 The coal quality rapid inspection device 2 also includes: a coal powder sampling tube 12 and a gas-powder separator 14. The coal powder sampling tube 12 is connected between the air-powder tube 1 and the gas-powder separator 14. The coal powder sampling tube 12 is inserted into the air-powder tube 1 to take out the coal powder and hot air mixture in equal proportion and send it into the gas-powder separator 14. The sample extracted by the coal powder sampling tube 12 has the same gas-solid ratio as the coal powder and hot air mixture in the air-powder tube 1, so that the sampling is representative.

[0041] The gas-powder separator 14 separates the coal powder obtained by the coal powder sampling tube 12 from the mixture to prevent other impurities from entering the coal quality detection and analyzer 16 and affecting the coal quality detection and analyzer 16. By only detecting the coal powder through the coal quality detection and analyzer 16, the accuracy of the coal quality detection and analyzer 16 in detecting and obtaining various parameters of the coal powder can be improved.

[0042] The gas-powder separator 14 applies the centrifugal separation principle of fluid mechanics, utilizes the air-powder tube 1 and the exhaust fan as two-phase flow power, and realizes gas-solid separation in a cyclonic manner.

[0043] According to some embodiments of the present invention, referring to Figure 1 , Figure 3 The coal quality quick inspection device 2 further includes: a sample storage 15, which is connected between the gas-powder separator 14 and the coal quality detection analyzer 16, and is used to store coal powder. The sample storage 15 temporarily stores and collects the coal powder sample separated from the gas-powder separator 14, and when the sample reaches a certain mass, it is sent to the coal quality detection analyzer 16 for detection; when the coal powder sample reaches a certain mass, it is sent to the coal quality detection analyzer 16, and the coal quality detection analyzer 16 needs a sufficient amount of coal powder sample to detect various data of the coal powder.

[0044] According to some embodiments of the present invention, referring to Figure 1 , Figure 3 The coal quality rapid inspection device 2 also includes: a discarded sample return pipe 3, one end of which is connected to the sample storage device 15 and the coal quality detection analyzer 16, and the other end is connected to the boiler 4. The coal powder detected by the coal quality detection analyzer 16 can be reused, and the excess coal powder stored in the sample storage device 15 can be reused, thereby improving the utilization rate of the coal powder after detection.

[0045] According to some embodiments of the present invention, referring to Figure 1 , Figure 3 There are multiple coal powder sampling tubes 12. In the conveying direction of the air powder tube 1, the multiple coal powder sampling tubes 12 are connected with the air powder tube 1 in sequence. A valve 13 is provided between the coal powder sampling tube 12 and the gas powder separator 14. The valve 13 includes multiple air inlets and air outlets. The multiple air inlets correspond to and are connected with the multiple coal powder sampling tubes 12 one by one. The air outlet is connected with the gas powder separator 14. The air outlet is connected with at least one air inlet. The air outlet can be connected with one air inlet, that is, the gas powder separator 14 can be connected with one of the coal powder sampling tubes 12; the air outlet can be connected with multiple air inlets, that is, the gas powder separator 14 can be connected with multiple coal powder sampling tubes 12. By selecting one of the air inlets to be connected with the air outlet, the coal powder-air mixture taken out from the coal powder sampling tube 12 corresponding to the air inlet can be introduced into the gas powder separator 14 to detect the basic ash content of the coal powder in the air powder tube 1 corresponding to the coal powder sampling tube 12, so as to achieve the effect of changing the sampling position.

[0046] According to some embodiments of the present invention, referring to Figure 1 , Figure 3 The coal-fired boiler system also includes: a coal quality rapid inspection industrial control computer 17, which is used to control the operation of the coal quality rapid inspection device 2 and to realize the automatic operation of the coal quality rapid inspection device 2.

[0047] The coal quality rapid inspection industrial computer 17 is also connected to the coal quality inspection and analysis instrument 16, and calculates and transforms the relevant inspection parameters of the coal quality inspection and analysis instrument 16, and finally obtains the coal quality parameters for obtaining the basic ash content of the coal powder air mixture.

[0048] According to the coal-fired boiler ash removal method of the second embodiment of the present invention, which is used in the coal-fired boiler system of the first embodiment of the present invention, the coal-fired boiler ash removal method comprises:

[0049] Step S1: The coal quality rapid inspection device 2 obtains the basic ash content of the coal powder in the air-powder pipe 1. The coal quality rapid inspection device 2 obtains the calorific value, ash content, volatile matter, moisture and other parameters of the coal powder transported to the boiler 4 through the coal quality detection analyzer 16, and the basic ash content of the coal powder can be calculated based on the above parameters.

[0050] Step S2: the ash removal control device 11 obtains the ash amount in the ash hopper according to the basic ash content of the coal powder in step S1. The ash removal control device 11 can calculate the ash amount entering the ash hopper after combustion in the boiler 4 according to the basic ash content of the coal powder.

[0051] Step S3: When the ash amount in the ash hopper reaches the preset ash amount, the ash removal control device 11 controls the ash removal device to clear the ash hopper; if the ash amount in the ash hopper does not reach the preset ash amount, the ash removal control device 11 continues to obtain the ash amount in the ash hopper until the ash amount in the ash hopper reaches the preset ash amount, and the ash removal control device 11 controls the ash removal device to clear the ash hopper.

[0052] The above method can be used to predict the amount of ash in the ash hopper in real time, and when the ash amount reaches the preset ash amount, the ash hopper can be cleaned automatically, thereby improving the timeliness of cleaning the ash hopper to achieve the optimal ash removal efficiency and avoid energy waste and equipment loss.

[0053] The above method can be used to implement more accurate ash removal operations, maintenance plan formulation, etc. It can also be used to guide ash storage scheduling in ash bins based on other external constraints.

[0054] According to the coal-fired boiler ash removal method of the embodiment of the present invention, the ash amount in the ash hopper can be predicted in real time, and after the ash amount reaches the preset ash amount, the ash hopper can be automatically cleaned, thereby improving the timeliness of cleaning the ash hopper to achieve the optimal ash removal efficiency and avoid energy waste and equipment loss.

[0055] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The ash removal device includes an electric field ash remover 5, and the ash hopper includes multiple economizer ash hoppers 6 and multiple electric field ash hoppers 7. The multiple electric field ash hoppers 7 are all connected to the electric field ash remover 5. The multiple economizer ash hoppers 6 and the multiple electric field ash hoppers 7 can be managed in the same way, thereby improving the overall adjustment and control of the ash removal device and making it more comprehensively optimized.

[0056] Step S2 includes:

[0057] The ash volume of each economizer ash hopper 6 meets: M 0 =B×A ar ×a 0 / n 0

[0058] There are i electric field ash hoppers 7, i is an integer from 1 to 5, and the ash volume of each electric field ash hopper 7 satisfies: M i =B×A ar ×(1-a 0 )×b i / n i

[0059] Among them, B is the hourly coal consumption of boiler 4, that is, the weight of coal powder that can be burned by boiler 4 within one hour, and the unit is t / h. The hourly coal consumption can be obtained through the coal consumption metering and weighing facilities of boiler 4.

[0060] A ar It is the basic ash content of the coal powder obtained by the coal quality quick detection device 22.

[0061] a 0 It is the proportion of ash collected by economizer ash hopper 6, which can be calculated by the ash amount collected by economizer ash hopper 6 before.

[0062] b i is the proportion of the ash collected by the i-th electric field ash hopper 7 to the total ash collected by the electric field ash remover 5. When i is 1, b 1 is the ratio of the ash volume collected by the first electric field ash hopper 7 to the total ash volume collected by the electric field ash remover 5; when i is 2, b 2 is the ratio of the ash volume collected by the second electric field ash hopper 7 to the total ash volume collected by the electric field ash remover 5; when i is 3, b 3 is the proportion of the ash collected by the third electric field ash hopper 7 to the total ash collected by the electric field ash remover 5; when i is 4, b 4 is the ratio of the ash volume collected by the fourth electric field ash hopper 7 to the total ash volume collected by the electric field ash remover 5; when i is 5; b 5 is the ratio of the ash volume collected by the fifth electric field ash hopper 7 to the total ash volume collected by the electric field ash remover 5, b 1 , b 2 , b 3 , b 4 and b 5 The value of can be calculated based on the amount of ash collected by the electric field ash hopper 7 before.

[0063] n 0 is the number of economizer ash hoppers 6, n 0 Can be 1 or 2 etc.

[0064] n i is the number of electric field ash hoppers 7 of the electric field ash remover, and i is an integer from 1 to 5.

[0065] M 0 M is the ash amount in economizer ash hopper 6; i is the ash amount in the corresponding i-th electric field ash hopper 7.

[0066] For example: the coal consumption of the boiler for 4 hours is B = 165t / h. The coal quality quick detection device 2 detects that the basic ash content entering the boiler 4 is Aar = 21%. The ash content collected by the economizer ash hopper 6 accounts for a 0 =10%, the ash volume collected by the ash hopper 7 of the i-th electric field accounts for the total fly ash collected by the electrostatic precipitator b 1 =75%, b2 =18.8%, b 3 =4.7%, b 4 =1.2%, b 5 =0.3%, number of economizer ash hopper 6 n 0 =2; the number of electric ash hoppers of an electrostatic precipitator is n 1 =4,n 2 =4,n 3 =4,n 4 =4,n 5 =4.

[0067] 165×21%×10% / 2=1.73t / h, that is, each economizer ash hopper 6 can collect 1.73t of coal ash per hour. When the ash amount in the economizer ash hopper 6 reaches the preset ash amount, the dust removal device drives the switch valve between the economizer ash hopper 6 and the ash bin, so that the coal ash in the economizer ash hopper 6 can be transported to the ash bin.

[0068] 165×21%×90%×75% / 5=11.69t / h, that is, the first electric field ash hopper 7 can collect 11.69t of coal ash per hour;

[0069] 165×21%×90%×18.8% / 5=2.93t / h, that is, the second electric field ash hopper 7 can collect 2.93t of coal ash per hour;

[0070] 165×21%×90%×4.7% / 5=0.73t / h, that is, the third electric field ash hopper 7 can collect 0.73t of coal ash per hour;

[0071] 165×21%×90%×1.2% / 5=0.18t / h, that is, the fourth electric field ash hopper 7 can collect 0.18t of coal ash per hour;

[0072] 165×21%×90%×0.3% / 5=0.047t / h, that is, the fifth electric field ash hopper 7 can collect 0.047t of coal ash per hour;

[0073] When the ash amount in the electric field ash hopper 7 reaches a preset ash amount, the dust removal device drives the switch valve between the electric field ash hopper 7 and the ash bin, so that the coal ash in the electric field ash hopper 7 can be transported to the ash bin.

[0074] According to some embodiments of the present invention, the electric field ash remover is a double-chamber five-electric field ash remover, that is, the coal-fired boiler system has two electric field ash removers,

[0075] The ash volume of each electric field ash hopper 7 satisfies: M i =B×A ar ×(1-a 0 )×b i ×0.5 / n i .

[0076] 165×21%×90%×75%×0.5 / 5=5.84t / h, that is, the first electric field ash hopper 7 can collect 5.84t of coal ash per hour;

[0077] 165×21%×90%×18.8%×0.5 / 5=1.47t / h, that is, the second electric field ash hopper 7 can collect 1.47t of coal ash per hour;

[0078] 165×21%×90%×4.7%×0.5 / 5=0.37t / h, that is, the third electric field ash hopper 7 can collect 0.37t of coal ash per hour;

[0079] 165×21%×90%×1.2%×0.5 / 5=0.09t / h, that is, the fourth electric field ash hopper 7 can collect 0.09t of coal ash per hour;

[0080] 165×21%×90%×0.3%×0.5 / 5=0.024t / h, that is, the fifth electric field ash hopper 7 can collect 0.024t of coal ash per hour;

[0081] When the ash amount in the electric field ash hopper 7 reaches a preset ash amount, the dust removal device drives the switch valve between the electric field ash hopper 7 and the ash bin, so that the coal ash in the electric field ash hopper 7 can be transported to the ash bin.

[0082] According to some embodiments of the present invention, step S3 includes: when the ash amount in one of the ash hoppers reaches a preset ash amount, the ash removal control device 11 controls the ash removal device to clear the corresponding ash hopper, and the amount of ash stored in each ash hopper is different within the same period of time. When the ash amount in one of the ash hoppers reaches a preset ash amount, the ash removal control device 11 is used to control the ash removal device to clear the corresponding ash hopper, thereby improving the working efficiency of the ash removal device in removing coal ash.

[0083] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0084] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A coal-fired boiler system, characterized in that: include: A combustion device, the combustion device comprising an air-powder pipe and a boiler, the air-powder pipe being in communication with the boiler and being used for conveying a coal-powder-air mixture into the boiler; An ash removal device, the ash removal device is connected to the boiler, the ash removal device comprises an ash hopper, and the ash hopper is used to store the coal ash after combustion of the boiler; A coal quality rapid inspection device, the coal quality rapid inspection device comprising a coal quality detection analyzer, the coal quality detection analyzer is connected to the air-powder pipe and is used to obtain the basic ash content of the coal-powder-air mixture in the air-powder pipe; An ash removal control device is electrically connected between the coal quality quick detection device and the ash removal device. The ash removal control device obtains the ash amount in the ash hopper according to the basic ash content to control the ash removal device to clear the ash hopper.

2. The coal-fired boiler system according to claim 1, characterized in that: The coal quality rapid inspection device also includes: a coal powder sampling tube and a gas-powder separator, the coal powder sampling tube is connected between the air-powder tube and the gas-powder separator, the gas-powder separator is connected to the coal quality detection analyzer, and the gas-powder separator is used to separate the coal powder in the coal-powder-air mixture.

3. The coal-fired boiler system according to claim 2, characterized in that: The coal quality rapid detection device further comprises: a sample storage device, the sample storage device is connected between the gas-powder separator and the coal quality detection analyzer, and the sample storage device is used to store the coal powder.

4. The coal-fired boiler system according to claim 3, characterized in that: The coal quality rapid testing device further comprises: a discarded sample return pipe, one end of which is connected to both the sample storage device and the coal quality testing analyzer, and the other end of which is connected to the boiler.

5. The coal-fired boiler system according to claim 2, characterized in that: There are multiple coal powder sampling tubes. In the conveying direction of the air-powder tube, the multiple coal powder sampling tubes are connected with the air-powder tube in sequence. A valve is provided between the coal powder sampling tube and the gas-powder separator. The valve includes multiple air inlets and air outlets. The multiple air inlets correspond to and are connected with the multiple coal powder sampling tubes one by one. The air outlets are connected with the gas-powder separator, and the air outlets are connected with at least one of the air inlets.

6. The coal-fired boiler system according to claim 1, characterized in that: Also includes: A coal quality rapid inspection industrial control computer, wherein the coal quality rapid inspection industrial control computer is used to control the operation of the coal quality rapid inspection device.

7. A coal-fired boiler ash removal method, characterized in that: For the coal-fired boiler system according to claims 1-6, the coal-fired boiler ash removal method comprises: Step S1: the coal quality quick detection device obtains the basic ash content of the coal powder in the air-powder pipe; Step S2: the ash removal control device obtains the ash amount of the ash hopper according to the basic ash content of the pulverized coal in step S1; Step S3: When the ash amount in the ash hopper reaches a preset ash amount, the ash removal control device controls the ash removal device to clear the ash hopper.

8. The coal-fired boiler ash removal method according to claim 7, characterized in that: The ash removal device includes an electric field ash remover, the ash hopper includes a plurality of economizer ash hoppers and a plurality of electric field ash hoppers, and the plurality of electric field ash hoppers are all connected to the electric field ash remover. The step S2 comprises: The ash volume of each economizer ash hopper satisfies: M0 = B × A ar ×a0 / n0 The electric field ash hopper has i, i is an integer from 1 to 5, and the ash volume of each electric field ash hopper satisfies: M i =B×A ar ×(1-a0)×b i / n i Wherein, B is the hourly coal consumption of the boiler; A ar is the basic ash content of the coal powder obtained by the coal quality quick inspection device; a0 is the proportion of ash collected by the economizer ash hopper; b i is the proportion of the ash collected by the i-th electric field ash hopper to the total ash collected by the electric field ash remover; n0 is the number of economizer ash hoppers; n i is the number of the electric field ash hoppers of the electric field ash remover; M0 is the ash volume of the economizer ash hopper; M i is the ash amount of the corresponding i-th electric field ash hopper.

9. The coal-fired boiler ash removal method according to claim 8, characterized in that: The electric field dust collector is a double-chamber five-electric field dust collector. The ash volume of each electric field ash hopper meets: M i =B×A ar ×(1-a0)×b i ×0.5 / n i .

10. The coal-fired boiler ash removal method according to claim 8, characterized in that: The step S3 includes: when the ash amount in one of the ash hoppers reaches a preset ash amount, the ash removal control device controls the ash removal device to clear the corresponding ash hopper.

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