A wind-powder intelligent adjustment system based on a storage type pulverizing system in power grid peak regulation

Abstract

This invention relates to the technical field of intelligent air-coal adjustment system for medium-density pulverizing systems, and discloses an intelligent air-coal adjustment system for medium-density pulverizing systems based on grid peak shaving. The system includes a connecting pipe, with air boxes on both sides of the connecting pipe. A hot primary air source pipe is installed on the side of each air box away from the connecting pipe. A regulating valve is installed in the middle section of the connecting pipe. A connecting pipe is installed at the bottom of each air box, and a coal powder discharge pipe is connected to the output end of each connecting pipe. A coal powder silo is connected to the upper end of each discharge pipe, and a conveying component is connected to the bottom end of each discharge pipe. A primary air pipe is installed at the bottom end of each conveying component. This invention adds an ash removal device at the air box inlet to remove fly ash carried in the primary air, preventing deposition and reducing the usable volume of the air box. This affects the flow field and velocity within the air box, ensuring that when there is a deviation in the outlet pressure of the hot primary air source pipes on both sides, the regulating valve adjusts the pressure, reducing the pressure in both air boxes and ensuring that the pressures on both sides are equal.

Description

Technical Field

[0001] This invention relates to the technical field of intelligent air-powder adjustment system for medium-storage pulverizing systems, and particularly to an intelligent air-powder adjustment system for medium-storage pulverizing systems based on grid peak shaving. Background Technology

[0002] In pulverized coal boilers, the pulverizing system is divided into a positive pressure pulverizing system and a negative pressure pulverizing system. This invention focuses on the device for the negative pressure pulverizing system, which operates in a tangential circle at the four corners of the boiler. The advantages of the central storage pulverizing system are that it improves the reliability of fuel supply for boiler operation, and the output of the coal mill is not constrained by the boiler load in the event of a short-term failure. Therefore, the coal mill can often operate under economical conditions. By adjusting the amount of coal fed into the furnace through the pulverizer, the time lag is small, improving the stability of boiler combustion regulation. Taking a 300MW unit as an example, the burner arrangement is generally 5 layers. The coal mill is a steel ball mill, with 4 units equipped. Every two coal mills correspond to one pulverized coal bin. The arrangement is two pulverized coal bins, and the two pulverized coal bins correspond to two primary air boxes, which are respectively connected to two primary air fans. The air boxes are interconnected. Each pulverized coal bin and air box corresponds to 10 pulverized coal pipes and 10 air ducts. The two pulverized coal bins and air boxes correspond to 20 pulverized coal feed pipes and 20 primary air ducts. Outside the furnace, the 20 pulverized coal feed pipes and 20 air ducts are connected. After connection, the air-coal mixture is sent into the furnace through the 20 primary pulverized coal pipes. The 20 pulverized coal pipes are divided into 5 layers inside the furnace, with 4 burners in each layer, corresponding to a total of 20 burners. The 4 burners in the same layer are each led out by 2 pipes from the left and right pulverized coal bins and air boxes. This design is based on the principle of proximity in the 4-corner arrangement of the boiler, reducing the length of the primary pulverized coal pipes and reducing pipeline resistance. Because the two air boxes on the left and right correspond to the two primary air fans on the left and right, there are certain differences in air pressure and resistance, resulting in differences in air velocity between burners on the same level. This deviation in air velocity means a deviation in pulverized coal concentration, and the amount of pulverized coal fed into different corners of the furnace within the same time period also varies. This has caused the furnace tangential circle to be skewed, leading to skewed combustion. Furthermore, during operation, pulverized coal accumulation in the pulverized coal silo may cause agglomeration and other problems. Before entering the pulverized coal feeder, it can easily get stuck in the feeder pipe, causing blockage and preventing the timely delivery of pulverized coal into the primary air duct and furnace, affecting the air-coal mixing concentration. Especially under deep peak shaving conditions, partial blockage of the feeder pipe may affect combustion, potentially leading to unplanned outages. Under the current background of deep peak shaving in the power grid, this problem is further amplified under low-load operating conditions, causing combustion instability, fluctuations in furnace negative pressure, and flame detection fluctuations, affecting the safe operation of the unit.

[0003] Therefore, it is necessary to solve the above problems by developing an intelligent adjustment system and method for air-coal pulverizing based on a power grid peak-shaving and storage-type pulverizing system. Summary of the Invention

[0004] The purpose of this invention is to provide an intelligent adjustment system and method for air-coal pulverizing based on a power grid peak-shaving and storage-type pulverizing system, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a connecting pipe is included, with air boxes provided on both the left and right sides of the connecting pipe, and a hot primary air source pipe provided on the side of each air box away from the connecting pipe. A regulating valve is provided in the middle section of the connecting pipe, and a connecting pipe is provided at the bottom of each air box. A pulverized coal discharge pipe is connected to the output end of each connecting pipe, and a pulverized coal silo is connected to the upper end of each pulverized coal discharge pipe. A conveying component is connected to the bottom end of each conveying component, and a primary air duct is provided at the bottom end of each conveying component.

[0006] Preferably, the connecting pipes include hot air pipes installed at the bottom of the air box, and a primary air duct regulating valve is installed in the middle section of the hot air pipes.

[0007] Preferably, each of the hot air ducts has a rear adjustment valve at its inner bottom, and two primary air ducts are provided at the inner bottom of the hot air duct. An adjustable contraction orifice is provided in the middle section of the primary air duct. A connecting valve is provided at the mixing point of the primary air duct and the powder discharge duct. The connecting valve is located below the adjustable contraction orifice. The end of the primary air duct contains the air-powder mixture, and a wind speed measuring device is installed at the air-powder mixture point of the primary air duct.

[0008] Preferably, a pulverized coal shut-off gate is provided between the pulverized coal pipe and the pulverized coal bin. The conveying component includes two anti-clogging devices installed inside the pulverized coal pipe. Both anti-clogging devices are installed inside the pulverized coal pipe. A pulverized coal conveying device is installed between the two anti-clogging devices. The pulverized coal conveying device is located inside the pulverized coal pipe and has multiple blades on its outer surface.

[0009] Preferably, a rectifier plate is provided at the connection between the powder discharge pipe and the primary air duct, and a vortex plate is provided at the bottom of the rectifier plate, the vortex plate being located inside the primary air duct.

[0010] Preferably, the anti-clogging device is provided with anti-clogging compressed air pipes connected to the side walls of the powder-feeding pipe on both sides, and the side walls of the anti-clogging compressed air pipes are provided with compressed air pipes and compressed air flow meters.

[0011] Preferably, the anti-clogging device includes a purge buffer chamber, the inner wall of which is symmetrically provided with multiple nozzles, the outer wall of which is symmetrically arranged with a compressed air pipe, and the side wall of the compressed air pipe is provided with a solenoid valve.

[0012] Preferably, the air box is equipped with an ash conveying device inside, and a vortex plate is provided above the ash conveying device. The vortex plate is located inside the air box and is close to the side of the hot primary air source duct.

[0013] Preferably, the ash conveying device includes an ash hopper at the bottom of the air box, an ash conveying pipe is provided inside the ash hopper at the bottom of the air box, and an ash storage area is provided at the bottom end of the ash conveying pipe. From top to bottom, an upper gate, an upper ash conveying compressed air pipe for the silo pump, the silo pump, a lower gate, and a lower ash conveying compressed air pipe for the silo pump are arranged between the upper ash conveying compressed air pipe for the silo pump and the lower ash conveying compressed air pipe for the silo pump. The fly ash inside the silo pump is discharged to the ash storage area through the compressed air from the lower ash conveying compressed air pipe for the silo pump.

[0014] A method for adjusting the air-powder intelligent adjustment system of a power grid peak-shaving and storage pulverizing system, S1: wind speed measuring device, measuring the dynamic pressure inside each primary air duct;

[0015] S2: Calculate the internal air velocity of each primary air duct based on the measured dynamic pressure;

[0016] S3: Calculate the average wind speed at a specific layer;

[0017] S4: Adjust the internal wind speed of several primary air ducts according to the average wind speed, so that the ratio of the internal wind speed of several primary air ducts in this layer to the average wind speed is within ±5%.

[0018] S5: The automatic damper can be used to level the four primary air ducts on each floor.

[0019] Preferably, S1: when all the ratios are outside of ±5%;

[0020] S2: The primary air duct regulating damper is coarsely adjusted, with an adjustment range of 80%-100%. In automatic adjustment mode, the primary air duct regulating damper is closed to a minimum of 80%.

[0021] S3: Then, the air velocity of the primary air duct is finely adjusted through the adjustable orifice, which has an adjustment range of 40%-100%.

[0022] The technical effects and advantages of this invention are as follows:

[0023] The present invention adds a dust removal device to the inlet of the bellows to remove fly ash carried in the primary air, thereby avoiding the deposition inside the bellows and reducing the practical volume of the bellows, which would affect the flow field velocity inside the bellows. The two bellows are connected by a connecting pipe, so that when there is a deviation in the outlet pressure of the hot primary air source pipes on both sides, the pressure of the two bellows can be adjusted by a regulating valve to reduce the pressure of the two bellows and ensure that the pressure on both sides is equal.

[0024] 2. This invention can precisely control the primary air volume according to the load condition when the unit is operating at low load, ensuring that the air-coal mixing concentration in the pipeline reaches a relatively matched concentration, ensuring stable combustion of the boiler under low load conditions, and improving the unit's flexibility and peak-shaving capability.

[0025] 3. This system has many advantages, is easy to install, and is highly practical, effectively improving the combustion stability of the unit.

[0026] 4. The present invention provides a purging compressed air header between the upper ash conveying compressed air pipe and the lower ash conveying compressed air pipe of the silo pump. The fly ash inside the silo pump is distributed to the ash storage area by the compressed air from the lower ash conveying compressed air pipe, which can effectively prevent the powder discharge pipe from getting blocked. Attached Figure Description

[0027] Figure 1 This is a top view of the primary air system of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of the coal powder bin and the powder feeding pipe of the present invention.

[0029] Figure 3 This is a top view of the front and rear purging devices of the powder feeder of the present invention.

[0030] Figure 4 This is a side view of the powder feeder purging device of the present invention.

[0031] Figure 5 The lower grid and vortex plate of the powder feeder of the present invention.

[0032] Figure 6 This is a side view of the baffle plate at the connection between the powder lowering pipe and the second primary air duct of the present invention.

[0033] Figure 7 This is a top view of the ash hopper opening at the bottom of the bellows of the present invention.

[0034] Figure 8 This is a schematic diagram of the ash conveying pipe structure of the present invention.

[0035] In the diagram: 1. Hot primary air source duct; 2. Air box; 3. Hot air duct; 4. Rear regulating valve; 5. Adjustable constriction orifice; 6. Air duct; 7. Ash conveying device; 8. Connecting pipe; 9. Regulating valve; 10. Primary air duct regulating valve; 11. Primary air duct; 12. Vortex plate; 13. Connecting valve; 15. Wind speed measuring device; 16. Pulverized coal silo; 17. Pulverized coal discharge pipe; 18. Pulverized coal pipe shut-off valve; 19. Anti-clogging device; 20. Anti-clogging device compressed air duct; 21. Pulverized coal conveyor. 22. Rectifier plate; 23. Vortex plate; 24. Blade; 25. Compressed air pipeline; 26. Compressed air flow meter; 27. Solenoid valve; 28. Nozzle; 29. ​​Purge buffer chamber; 30. Ash hopper opening at the bottom of the air box; 31. Ash conveying pipe; 32. Silo pump; 33. Ash and slag temporary storage area; 34. Lower gate; 35. Upper gate; 36. Upper ash conveying compressed air pipe of silo pump; 37. Lower ash conveying compressed air pipe of silo pump; 38. Purge compressed air main pipe. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] This invention provides, for example Figures 1 to 8 The illustrated intelligent air-coal adjustment system based on a grid peak-shaving and storage-type pulverizing system includes a connecting pipe 8. Air boxes 2 are installed on both the left and right sides of the connecting pipe 8. Hot primary air source pipes 1 are installed on the side of the air boxes 2 away from the connecting pipe 8. A regulating valve 9 is installed in the middle section of the connecting pipe 8. A connecting pipe is installed at the bottom of the air boxes 2. A coal powder discharge pipe 17 is connected to the output end of the connecting pipe. A coal powder bin 16 is connected to the upper end of the coal powder discharge pipe 17. A conveying component is connected to the bottom end of the conveying component. A primary air pipe 11 is installed at the bottom end of the conveying component.

[0039] The connecting pipes include hot air pipes 3 installed at the bottom of the air box 2, and a primary air pipe regulating valve 10 is installed in the middle section of the hot air pipe 3.

[0040] Each hot air duct 3 has a rear adjustment valve 4 at its inner bottom. Two primary air ducts 11 are installed at the inner bottom of the hot air duct 3. An adjustable shrinkage orifice 5 is opened in the middle section of the primary air duct 11. A connecting valve 13 is installed at the mixing point of the primary air duct 11 and the powder discharge pipe 17. The connecting valve 13 is located below the adjustable shrinkage orifice 5. The end of the primary air duct 11 is the air-powder mixture. A wind speed measuring device 15 is installed at the air-powder mixture of the primary air duct 11.

[0041] The air box 2 is equipped with an ash conveying device 7. A vortex plate 12 is installed above the ash conveying device 7. The vortex plate 12 is installed inside the air box 2 and is located on one side close to the hot primary air source pipe 1.

[0042] In operation, an external fan connected to the primary hot air supply duct 1 delivers air from the primary hot air supply duct 1 into the air box 2. Upon entering the air box 2, a vortex plate 2 is installed at each inlet. Its function is to remove ash from the primary hot air supply duct 1 using an impact-type principle. Since the primary hot air supply duct 1 is heated by an air preheater and exchanges heat with the flue gas, it contains approximately 10% fly ash. If this fly ash is not removed, it will accumulate inside the air box 2, affecting the actual space of the air box 2. The flow field, the lower part of the vortex plate 12 is equipped with an ash conveying device 7, which can transport the fly ash to the ash and slag temporary storage area after separation, and transport it off the site along with the slag. The regulating valve 9 adjusts the internal pressure of the two wind boxes 2, which can balance the pressure of the two wind boxes 2. When the output of the two wind boxes 2 is unbalanced, the regulating valve 9 can ensure that the pressure of the two wind boxes 2 is balanced. Or, when the hot primary air source pipe 1 on one side fails, the operation of the hot primary air source pipe 1 on one side can also ensure the supply of hot air on both sides, ensuring the combustion of the unit. Generally, one side of the wind box 2 Ten primary air ducts are drawn from each side, totaling 20 ducts on both sides. The diagram shows only six primary air ducts 11 on each side. Taking a tangentially circular combustion boiler as an example, it can be divided into 5 layers, with 4 primary air ducts 11 on each layer and 4 burners. Due to distance limitations on the left and right sides, the four primary air ducts 11 on the same layer each have two primary air ducts 11 drawn from each side, forming one layer. To more precisely control the uniformity of the four primary air ducts 11 on both sides, the system designs the two primary air ducts 11 on the same side of the same layer as a split-in configuration, with a rear regulating damper 4 installed before the split. The total air volume of the two primary air ducts 11 is adjusted for coarse adjustment. A rear damper 4 is installed after the two primary air ducts 11. The function of the rear damper 4 is to close the rear damper 4 directly for isolation when there is an abnormality in the hot primary air source duct 1 and it needs to be dealt with. An adjustable constriction orifice 5 is added after the rear damper 4 to adjust the primary air velocity in multiple stages. An air velocity measuring device 15 is installed after the adjustable constriction orifice 5. The adjustment of the primary air duct regulating damper 10 and the adjustable constriction orifice 5 before the split is based on the air velocity measuring device 15.

[0043] Example 2

[0044] based on Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a powder pipe shut-off gate 18 is provided between the powder supply pipe 17 and the powder silo 16. The conveying component includes an anti-blocking device 19 installed inside the powder supply pipe 17. There are two anti-blocking devices 19, both of which are installed inside the powder supply pipe 17. A powder conveying device 21 is installed between the two anti-blocking devices 19. The powder conveying device 21 is located inside the powder supply pipe 17, and multiple blades 24 are provided on the outer surface of the powder conveying device 21.

[0045] A rectifier plate 22 is provided at the connection between the powder discharge pipe 17 and the primary air pipe 11. A vortex plate 23 is provided at the bottom of the rectifier plate 22, and the vortex plate 23 is located inside the primary air pipe 11.

[0046] The anti-clogging device 19 has anti-clogging compressed air pipes 20 connected to the side walls of the powder pipe 17 on both sides. The anti-clogging compressed air pipes 20 have compressed air pipes 25 on the side walls of the side walls of the compressed air pipes 20 and compressed air flow meters 26 on the side walls of the compressed air pipes 25.

[0047] The anti-clogging device 19 includes a purge buffer chamber 29, with multiple nozzles 28 symmetrically arranged on the inner side wall of the purge buffer chamber 29, and the outer side wall of the purge buffer chamber 29 symmetrically arranged with a compressed air pipe 25, with a solenoid valve 27 arranged on the side wall of the compressed air pipe 25.

[0048] In operation, the device has two coal powder bins 16, corresponding to the two side air boxes 2 respectively. After the coal powder comes out from the external fine powder separator, it is separated by high speed and falls into the coal powder bins 16. One coal powder discharge pipe 17 corresponds to one primary air pipe 11. Only one primary air pipe 11 is marked on one side in the figure. This system has added an anti-clogging device 19. During normal operation, the compressed air pipeline 25 maintains a control pressure greater than the air pipe pressure by 1 kPa, maintaining a slightly positive pressure state. This can effectively make the coal powder in the coal powder discharge pipe 17 slightly fluffy, which is conducive to the coal powder conveying device 21 conveying coal powder. With the negative pressure suction effect of the vortex plate 23, it is easier to mix the air inside the coal powder primary air pipe 11. When special situations such as blockage occur in the coal powder discharge pipe 17, the coal powder shut-off valve 18 can be closed, the coal powder conveying device 21 can be started, and the purging pressure and purging flow of the anti-clogging device 19 can be increased. In a short time, the coal powder discharge pipe 17 can be cleared under hot conditions without affecting combustion.

[0049] Eight angled downward nozzles 28 are installed along the outer wall of the powder discharge pipe 17. All nozzles 28 are made of wear-resistant material. The internal pressure of the compressed air pipeline 25 is detected by the compressed air flow meter 26, which can automatically control the purging flow and purging pressure. The solenoid valve 27 controls the opening and closing of the compressed air pipeline 25. The pressure measurement is the pressure in the purging buffer chamber 29. The temperature after the air and powder are mixed in the primary air duct 11 can be used to determine whether there is a blockage in the powder discharge pipe 17. If the temperature rises, the automatic control flow valve will automatically adjust the purging flow to purge the powder discharge pipe 17.

[0050] The nozzle 28 forms a 25° angle with the wall of the pulverized coal pipe 17, and the direction is consistent with the flow direction of the pulverized coal. The angles between the front and rear purging devices of the pulverizer are also consistent, both being 25°. Figure 3 As shown, the purge buffer chambers 29 are all annular structures with air intakes on the left and right sides to ensure pressure balance within the entire annulus and to ensure consistent flow rates at each nozzle 28.

[0051] like Figure 5 and Figure 6 The lower part of the pulverized coal conveying device 21 has a rectifier plate 22 with a height of 5cm. In order to distribute the pulverized coal evenly, the vortex plate 23 forms a 25° angle with the bottom of the pulverized coal feeding pipe 17. The width of the vortex plate 23 is 1 / 6 of the diameter of the pulverized coal feeding pipe. The vortex plate 23 can generate vortices at the bottom of the pulverized coal feeding pipe 17, which plays a role in entrainment. The bottom of the vortex plate 23 has a downward suction effect on the pulverized coal feeding pipe 17, which can further prevent the pulverized coal feeding pipe 17 from being blocked and affecting the combustion stability of the unit. Both the rectifier plate 22 and the vortex plate 23 are made of high-strength wear-resistant materials.

[0052] Example 3

[0053] The ash conveying device 7 includes an ash hopper opening 30 at the bottom of the air box, an ash conveying pipe 31 is installed inside the ash hopper opening 30, an ash storage area 33 is installed at the bottom end of the ash conveying pipe 31, and an upper insertion door 35 is installed between the ash conveying pipe 31 and the ash storage area 33 from top to bottom.

[0054] The silo pump consists of an upper ash conveying compressed air pipe 36, a silo pump 32, a lower insert door 34, and a lower ash conveying compressed air pipe 37. A purging compressed air header pipe 38 is provided between the upper ash conveying compressed air pipe 36 and the lower ash conveying compressed air pipe 37. The fly ash inside the silo pump 32 is distributed to the ash and slag temporary storage area 33 by the compressed air from the lower ash conveying compressed air pipe 37.

[0055] During operation, fly ash is separated by the vortex plate 12 of the air box 2 and falls into the ash hopper 30 at the bottom of the air box. Every hour, the upper baffle door 35 is opened once, and the fly ash falls into the silo pump 32. The upper baffle door 35 is open for 2 minutes. After the upper baffle door 35 is closed, the lower baffle door 34 is opened. At the same time, compressed air is introduced into the ash conveying compressed air pipe 37 at the bottom of the silo pump and the ash conveying compressed air pipe 36 at the top of the silo pump for ash conveying. A solenoid valve is installed on the purging compressed air main pipe 38. The entire ash conveying process is operated by the original control.

[0056] Example 4

[0057] A method for adjusting a wind-coal intelligent adjustment system for a power grid peak-shaving and storage-type pulverizing system includes S1: a wind speed measuring device 15, which measures the dynamic pressure inside each primary air duct 11;

[0058] S2: Calculate the internal air velocity of each primary air duct 11 based on the measured dynamic pressure;

[0059] S3: Calculate the average wind speed at a specific layer;

[0060] S4: Adjust the internal wind speed of several primary air ducts 11 according to the average wind speed, so that the ratio of the internal wind speed of several primary air ducts 11 in this layer to the average wind speed is within ±5%.

[0061] S5: The automatic damper can be used to level the four primary air ducts 1 on each floor.

[0062] Preferably, S1: when all the ratios are outside of ±5%;

[0063] S2: The primary air duct regulating damper 10 is coarsely adjusted, with an adjustment range of 80%-100%. In automatic adjustment mode, the damper is closed to a minimum of 80%.

[0064] S3: Then, the air velocity of the primary air duct 11 is finely adjusted through the adjustable orifice 5. The adjustment range of the adjustable orifice 5 is 40%-100%.

[0065] During use, the air velocities of the primary air ducts on the same floor are 1, 2, 3, and 4 respectively. The left-side air box 2 of the hot primary air source duct 1 connects to the other side of the hot primary air source duct 1. Figure 1The rear regulating valve 4 of the two primary air ducts 11 at the outlet of the left air box 2 before the separation of the primary air box 2 is used to regulate the total airflow of the two primary air ducts 11. When the primary air duct regulating valve 10 is not separated, coarse adjustment can be made to the two primary air ducts 11 before separation. That is, the adjustment range of the two regulating valves of the left and right primary air ducts 10 is 80%-100%. In the automatic adjustment state, the regulating valve is closed to a minimum of 80%. When special circumstances occur, the automatic control can be deactivated. In the non-automatic adjustment state, the primary air duct regulating valve 10 can be fully opened or fully closed. In the automatic state, the adjustment frequency of the regulating valve is once every 10 minutes.

[0066] The wind speed calculation formula for the wind speed measuring device 15 is as follows:

[0067] ;

[0068]

[0069] in: Wind speed (m / s);

[0070] This refers to the velocity sensing tube coefficient;

[0071] The measured dynamic pressure value in Pa;

[0072] Primary air density kg / m 3 ;

[0073] The air density under standard conditions is 1.293 kg / m³. 3 ;

[0074] P is the pressure of the measured medium in Pa;

[0075] t represents the temperature of the measured medium in °C.

[0076] like Figure 1 As shown, each adjustable orifice 5 controls the air speed of a primary air duct. The air speed of each air duct can be finely adjusted through the adjustable orifice 5. The adjustment range of the adjustable orifice 5 is 40%-100%. The adjustment of the opening of the adjustable orifice 5 is not affected by the automatic and non-automatic states. The adjustment frequency of this gate is once every 10 minutes.

[0077] The adjustment sequence is as follows: first adjust the primary air duct regulating valve 10; if the wind speed deviation is not within a reasonable range after adjusting the primary air duct regulating valve 10, then adjust the adjustable contraction orifice 5.

[0078] When the wind speed measuring device 15 displays a fault or abnormality, the regulating valve 10 of the primary air duct and the connecting valve 13 are kept fully open to avoid excessive adjustment due to abnormal display of the measuring point, which would affect the wind speed of the primary air duct 11 and thus affect combustion.

[0079] Wind speed deviation calculation (mean ω) = (ω1 + ω2 + ω3 + ω4) / 4

[0080] ω1 / (mean ω) = between 0.95 and 1.05.

[0081] ω2 / (mean ω) = between 0.95 and 1.05.

[0082] ω3 / (mean ω) = between 0.95 and 1.05.

[0083] ω4 / (mean ω) = between 0.95 and 1.05.

[0084] When the ratio is between 0.95 and 1.05, the reasonable operating range is determined. When it is outside the range, the opening of the primary air duct regulating damper 10 and the adjustable constriction orifice 5 needs to be adjusted, and the air speed of the primary air duct 11 needs to be adjusted to be within the reasonable range.

[0085] When the wind speed of the four primary air ducts 11 deviates from the average value by less than ±5%, the primary air duct regulating valve 10 and the adjustable contraction orifice 5 are not adjusted. When the wind speed measuring device 15 shows that the wind speed deviation is not within ±5%, adjustment begins. This system can directly eliminate the manual primary air leveling test and can be adjusted under cold and hot conditions to ensure that the wind speed and pulverized coal concentration are always in a balanced state, thereby increasing the combustion stability of the boiler under various operating conditions.

[0086] This system can effectively solve the problem of unstable boiler combustion under deep peak shaving conditions, ensure the safe operation of the unit, and prevent blockage of the pulverized coal feed pipe and uneven distribution of air volume and pulverized coal under any load conditions, which would affect the normal operation of the unit under peak shaving conditions. The system has a simple structure, low cost, convenient installation, good effect, and strong practicality.

[0087] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A smart air-coal pulverizing system based on a power grid peak-shaving and energy storage pulverizing system, characterized in that: The system includes a connecting pipe (8), with air boxes (2) on both the left and right sides of the connecting pipe. A hot primary air source pipe (1) is provided on the side of the air box (2) away from the connecting pipe (8). A regulating valve (9) is provided in the middle section of the connecting pipe (8). A connecting pipe is provided at the bottom of the air box (2). A pulverizing pipe (17) is connected to the output end of the connecting pipe. A pulverizing silo (16) is connected to the upper end of the pulverizing pipe (17). A conveying component is connected to the bottom end of the pulverizing pipe (17). A primary air pipe (11) is provided at the bottom end of the conveying component. The air box (2) is equipped with an ash conveying device (7), and a vortex plate (12) is provided above the ash conveying device (7). The vortex plate (12) is located inside the air box (2) and is close to the side of the hot primary air source pipe (1). The ash conveying device (7) includes an ash hopper opening (30) at the bottom of the air box. An ash conveying pipe (31) is provided inside the ash hopper opening (30) at the bottom of the air box. An ash storage area (33) is provided at the bottom end of the ash conveying pipe (31). An upper insertion door (35) is provided between the ash conveying pipe (31) and the ash storage area (33) from top to bottom. The silo pump consists of an upper ash conveying compressed air pipe (36), a silo pump (32), a lower insert door (34), and a lower ash conveying compressed air pipe (37). A purging compressed air header pipe (38) is provided between the upper ash conveying compressed air pipe (36) and the lower ash conveying compressed air pipe (37). The fly ash inside the silo pump (32) is distributed to the ash and slag temporary storage area (33) through the compressed air from the lower ash conveying compressed air pipe (37).

2. The intelligent air-coal adjustment system based on a power grid peak-shaving and storage-type pulverizing system according to claim 1, characterized in that: The connecting pipes include hot air pipes (3) installed at the bottom of the air box (2), and a primary air pipe regulating valve (10) is installed in the middle section of the hot air pipe (3).

3. The intelligent air-coal adjustment system based on a power grid peak-shaving and storage-type pulverizing system according to claim 2, characterized in that: The hot air duct (3) is equipped with a rear adjustment valve (4) at the bottom of its interior. The hot air duct (3) is equipped with two primary air ducts (11) at the bottom of its interior. The middle section of the primary air duct (11) is provided with an adjustable shrinkage hole (5). A connecting valve (13) is provided at the mixing point of the primary air duct (11) and the powder discharge pipe (17). The connecting valve (13) is located below the adjustable shrinkage hole (5). The end of the primary air duct (11) is a mixture of air and powder. A wind speed measuring device (15) is installed at the air-powder mixture of the primary air duct (11).

4. The intelligent air-coal adjustment system based on a power grid peak-shaving and storage-type pulverizing system according to claim 1, characterized in that: A powder pipe shut-off door (18) is provided between the powder supply pipe (17) and the powder silo (16). The conveying component includes an anti-blocking device (19) installed inside the powder supply pipe (17). There are two anti-blocking devices (19), both of which are installed inside the powder supply pipe (17). A powder conveying device (21) is provided between the two anti-blocking devices (19). The powder conveying device (21) is located inside the powder supply pipe (17). Multiple blades (24) are provided on the outer surface of the powder conveying device (21).

5. The intelligent air-coal adjustment system based on a power grid peak-shaving and storage-type pulverizing system according to claim 4, characterized in that: A rectifier plate (22) is provided at the connection between the powder discharge pipe (17) and the primary air pipe (11). A vortex plate (23) is provided at the bottom of the rectifier plate (22). The vortex plate (23) is located inside the primary air pipe (11).

6. The intelligent air-coal adjustment system based on a power grid peak-shaving and storage-type pulverizing system according to claim 4, characterized in that: The anti-clogging device (19) has anti-clogging compressed air pipes (20) connected to the side walls of the powder pipe (17) on both sides. The side walls of the anti-clogging compressed air pipes (20) are provided with compressed air pipes (25), and the side walls of the compressed air pipes (25) are provided with compressed air flow meters (26).

7. A wind-coal intelligent adjustment system based on a power grid peak-shaving and storage-type pulverizing system as described in claim 5, characterized in that: The anti-clogging device (19) includes a purge buffer chamber (29), the inner sidewall of which is symmetrically provided with multiple nozzles (28), the outer sidewall of which is symmetrically provided with a compressed air pipe (25), and the sidewall of the compressed air pipe (25) is provided with a solenoid valve (27).

8. A method for adjusting the air-coal intelligent adjustment system of a power grid peak-shaving and storage-type pulverizing system, wherein the method is implemented using the air-coal intelligent adjustment system of a power grid peak-shaving and storage-type pulverizing system as described in any one of claims 1-7, characterized in that: S1: Wind speed measuring device (15) measures the dynamic pressure inside each primary air duct (11); S2: Calculate the internal air velocity of each primary air duct (11) based on the measured dynamic pressure; S3: Calculate the average wind speed; S4: Adjust the internal wind speed of several primary air ducts (11) according to the average wind speed, so that the ratio of the internal wind speed of several primary air ducts (11) in this layer to the average wind speed is within ±5%. S5: The automatic damper can be used to adjust the wind speed of the four primary air ducts (11) on each floor.

9. The adjustment method of the intelligent air-coal pulverizing system for a power grid peak-shaving and storage-type pulverizing system according to claim 8, characterized in that: S1: When all the ratios are outside ±5%; S2: The primary air duct regulating valve (10) is coarsely adjusted, with an adjustment range of 80%-100%. In automatic adjustment mode, the primary air duct regulating valve (10) is closed to a minimum of 80%. S3: Then the air velocity of the primary air duct (11) is finely adjusted through the adjustable orifice (5). The adjustment range of the adjustable orifice (5) is 40%-100%.

Images