Smooth powder discharging system of middle storage type coal-fired boiler and boiler system with smooth powder discharging system

Abstract

The utility model discloses a smooth powder discharging system of a middle storage type coal-fired boiler and a boiler system with the same, the smooth powder discharging system of the middle storage type coal-fired boiler comprises a powder bin and a vertical pipe, the lower end of the powder bin forms a powder outlet end, the powder outlet end is provided with a powder outlet, the vertical pipe extends in the vertical direction, and the upper end of the vertical pipe is connected and communicated with the powder outlet; the air-powder mixer is provided with a mixing cavity, the air-powder mixer is arranged on the lower side of the vertical pipe, and the lower end of the vertical pipe is connected with the air-powder mixer and communicates with the mixing cavity; the first fluidization pipe is connected with the powder outlet end, and the first fluidization pipe is used for conveying fluidization air into the powder bin; the second fluidization pipe is connected and communicated with the lower end of the vertical pipe, and the second fluidization pipe is used for conveying fluidization air into the vertical pipe. According to the smooth powder discharging system of the middle storage type coal-fired boiler, powder can be discharged more stably and smoothly, so that the coal-fired boiler can obtain stable and reliable coal powder supply, and the coal-fired boiler operates more stably.

Description

Technical Field

[0001] This utility model relates to the field of boiler equipment technology, and in particular to a smooth pulverized coal feeding system for a medium-storage coal-fired boiler and a boiler system having the same. Background Technology

[0002] Because the pulverized coal in the pulverized coal silo of an intermediate storage coal-fired boiler rolls, slides, and settles under gravity, the geometric, physical, and even chemical properties of the pulverized coal can affect its movement, thus affecting the silo discharge. During the discharge process, the flow of the pulverized material is unstable, sometimes even arching and blocking, preventing the pulverized material from being discharged. Sometimes, the pulverized material around the central perforation in the silo remains stationary, or sometimes it surges continuously, causing all the pulverized material in the silo to be discharged at once, which is uncontrollable. Other situations that occur during the discharge process also lead to poor material distribution and conveying stability during the pulverized coal silo discharge process of the intermediate storage coal-fired boiler. The pulverized coal discharge is not smooth, making it difficult to provide a uniform and stable pulverized coal supply to the coal-fired boiler. This can cause the coal-fired boiler to extinguish, thus reducing the operational stability of the coal-fired boiler. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, this utility model proposes a smooth pulverized coal feeding system for a medium-storage coal-fired boiler. This system enables more stable, reliable, and smooth pulverized coal feeding, thereby providing a stable and reliable supply of pulverized coal to the coal-fired boiler and allowing for more stable boiler operation.

[0004] This utility model also proposes a boiler system with the above-mentioned smooth pulverized coal feeding system for medium-storage coal-fired boilers.

[0005] According to the first aspect of this utility model, a smooth pulverized coal feeding system for a medium-storage coal-fired boiler includes: a pulverized coal bin and a riser, the lower end of the pulverized coal bin forming a pulverized coal outlet, the pulverized coal outlet having a pulverized coal outlet, the riser extending in a vertical direction, the upper end of the riser being connected to and communicating with the pulverized coal outlet; an air-pulverized coal mixer having a mixing chamber, the air-pulverized coal mixer being disposed on the lower side of the riser, the lower end of the riser being connected to the air-pulverized coal mixer and communicating with the mixing chamber; a first fluidizing pipe, the first fluidizing pipe being connected to the pulverized coal outlet, the first fluidizing pipe being used to deliver fluidizing air into the pulverized coal bin; and a second fluidizing pipe, the second fluidizing pipe being connected to and communicating with the lower end of the riser, the second fluidizing pipe being used to deliver fluidizing air into the riser.

[0006] According to the smooth coal pulverization system of the medium-storage coal-fired boiler of this utility model, by setting a first fluidizing pipe and a second fluidizing pipe, the first fluidizing pipe delivers fluidizing air into the pulverized coal silo, and the second fluidizing pipe delivers fluidizing air into the riser. This effectively avoids the accumulation and clumping of pulverized coal at the outlet of the pulverized coal silo and at the lower end of the riser, so that the pulverized coal can be delivered from the silo to the air-coal mixer more stably and smoothly and mix with the primary air. This makes the pulverized coal delivery more stable and smooth, thereby ensuring a stable and reliable supply of pulverized coal to the coal-fired boiler and making the operation of the coal-fired boiler more stable.

[0007] In some embodiments of this utility model, the first fluidizing tube extends horizontally, or the first fluidizing tube extends obliquely toward the powder outlet in a downward direction.

[0008] In some embodiments of this utility model, the second fluidizing tube extends obliquely toward the riser in a downward direction.

[0009] In one embodiment of this utility model, the angle between the second fluidizing tube and the horizontal direction is greater than or equal to 45° and less than or equal to 60°.

[0010] In some embodiments of this utility model, the smooth pulverized coal feeding system of the medium-storage coal-fired boiler further includes: a first regulating valve and a second regulating valve, wherein the first regulating valve is disposed in the first fluidizing pipe and the second regulating valve is disposed in the second fluidizing pipe.

[0011] In some embodiments of this utility model, the air-powder mixer includes: a mixer body, the mixer body extending along a first direction and having a mixing chamber, the upper end of the mixing chamber having a powder inlet, the first direction being a first direction within the horizontal direction; a powder drop pipe, the upper end of the powder drop pipe being connected and communicating with the lower end of the vertical pipe, the lower end of the powder drop pipe being connected to the powder inlet of the mixer body and communicating with the mixing chamber, wherein the mixer body includes a flow guide and a square plate, the flow guide and the square plate being located at the upper end of the mixer body, the powder inlet being formed between the flow guide and the square plate, the flow guide having a flow guiding portion, the flow guiding portion being disposed within the mixing chamber, and in the first direction, the flow guiding portion being disposed upstream of the powder inlet in the fluid flow direction of the mixing chamber.

[0012] In one embodiment of the present invention, the guide portion has an air guide surface and a flow guide surface formed on both sides of the first direction. In the first direction, the air guide surface is located on the side of the guide portion away from the powder inlet. The air guide surface is formed as an arc surface concave towards the powder inlet. The flow guide surface extends along the vertical direction.

[0013] In one embodiment of the present invention, the smooth pulverized coal feeding system of the medium-storage coal-fired boiler further includes a guide plate, which is disposed in the mixing chamber and extends along the first direction. In the vertical direction, the guide plate is located below the pulverized coal inlet and is spaced apart from the guide member.

[0014] In some examples of this utility model, the guide plate is provided with a plurality of guide holes, and the plurality of guide holes are arranged in an array on the guide plate, and the guide holes penetrate the guide plate along the vertical direction.

[0015] A boiler system according to a second aspect of the present invention includes: a primary air system and a burner; a coal-fired boiler smooth pulverized coal feeding system according to a first aspect of the present invention, wherein the primary air system is used to supply primary air to the air-coal mixer, the first fluidizing pipe and the second fluidizing pipe, and the outlet of the air-coal mixer is connected to the burner.

[0016] According to the boiler system of this utility model, by setting up the smooth pulverized coal feeding system of the medium-storage coal-fired boiler mentioned in the first aspect, and by setting up a first fluidizing pipe and a second fluidizing pipe, the first fluidizing pipe delivers fluidizing air into the pulverized coal silo, and the second fluidizing pipe delivers fluidizing air into the riser, which effectively avoids the accumulation and clumping of pulverized coal at the outlet of the pulverized coal silo and at the lower end of the riser. This allows the pulverized coal to be fed more stably and smoothly from the pulverized coal silo into the air-pulverized coal mixer to mix with the primary air, making the feeding of pulverized coal more stable and smooth. As a result, the coal-fired boiler can obtain a stable and reliable supply of pulverized coal, making the operation of the coal-fired boiler more stable.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a boiler system according to an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 The diagram shows a magnified view of a portion of point A.

[0020] Figure label:

[0021] 10. Powder hopper; 101. Powder outlet;

[0022] 20. Riser;

[0023] 30. Powder mixer; 301. Powder outlet;

[0024] 31. Mixer body;

[0025] 311. Air guide component; 3111. Air guide surface; 3112. Air guide surface;

[0026] 312. Square plate; 313. Front tongue plate; 314. Rear tongue plate;

[0027] 32. Powder discharge tube;

[0028] 40. Guide vane; 50. First fluidizing tube; 60. Second fluidizing tube;

[0029] 100. Smooth pulverized coal feeding system for medium-density coal-fired boilers; 200. Primary air system; 300. Burner;

[0030] 1000. Boiler system. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0032] First, refer to Figure 1 A boiler system 1000 according to a second aspect embodiment of the present utility model will be briefly described. The boiler system 1000 includes a primary air system 200, a medium-storage coal-fired boiler smooth coal feeding system 100, and a burner 300. The primary air system 200, in conjunction with the medium-storage coal-fired boiler smooth coal feeding system 100, mixes primary air with pulverized coal to form a pulverized coal airflow and delivers the pulverized coal airflow to the burner 300 to participate in boiler combustion.

[0033] The following is for reference. Figure 1 and Figure 2 Description of a smooth pulverized coal feeding system 100 for a medium-storage coal-fired boiler according to a first aspect embodiment of the present invention.

[0034] like Figure 1 and Figure 2 As shown, the smooth coal feeding system 100 for a medium-storage coal-fired boiler according to the first aspect embodiment of the present invention includes: a coal silo 10 and a riser 20, an air-coal mixer 30, a first fluidizing pipe 50 and a second fluidizing pipe 60.

[0035] Specifically, the lower end of the powder hopper 10 is formed as a powder outlet, and the powder outlet is provided with a powder outlet 101. The riser 20 is positioned along the vertical direction (e.g., Figure 1Extending in the vertical direction (as shown), the upper end of the riser 20 is connected to and communicates with the powder outlet 101; the air-powder mixer 30 has a mixing chamber, and the air-powder mixer 30 is located on the lower side of the riser 20, with the lower end of the riser 20 connected to the air-powder mixer 30 and communicating with the mixing chamber; the first fluidizing pipe 50 is connected to the powder outlet end, and the first fluidizing pipe 50 is used to convey fluidizing air into the powder hopper 10; the second fluidizing pipe 60 is connected to and communicates with the lower end of the riser 20, and the second fluidizing pipe 60 is used to convey fluidizing air into the riser 20.

[0036] In this embodiment, the coal powder feeding system 100 of the medium-storage coal-fired boiler is equipped with a coal powder bin 10, a riser 20, and an air-coal powder mixer 30. The two ends of the riser 20 are connected to the dust outlet 101 and the air-coal powder mixer 30, respectively. The riser 20 is connected to the mixing chamber of the air-coal powder mixer 30. The structure is simple and can well meet the needs of coal powder feeding. When the medium-storage coal-fired boiler smooth coal powder feeding system 100 is in operation, the coal powder stored in the coal powder bin 10 flows into the riser 20 from the dust outlet 101 under the action of gravity. The powder flows into the mixing chamber of the air-coal powder mixer 30 along the riser 20 and mixes with the primary air, thereby forming a coal powder airflow. Then the coal powder airflow flows into the burner 300 to participate in combustion.

[0037] In this embodiment, the first fluidizing pipe 50 is connected to the powder outlet end. The first fluidizing pipe 50 is used to convey fluidizing air into the powder silo 10. It has a simple structure and reasonable arrangement, so that the fluidizing air flowing into the powder silo 10 through the first fluidizing pipe 50 can be arranged close to the powder outlet 101. This allows the fluidizing air to fluidize the powder near the powder outlet 101 in the powder silo 10, so that the powder can mix with the fluidizing air and form a flowing state under the action of the fluidizing air. This can effectively avoid the powder from clumping or accumulating on the inner wall of the powder silo 10, and greatly improve the fluidity of the powder. This allows the powder to fall more smoothly and stably from the powder outlet 101 into the riser 20, so that the powder silo 10 can discharge material stably and smoothly, and the powder can flow out of the powder silo 10 more evenly and uniformly, making the powder discharge more stable and uniform.

[0038] In this embodiment, the second fluidizing pipe 60 is connected to and communicates with the lower end of the riser 20. The second fluidizing pipe 60 is used to deliver fluidizing air into the riser 20. It has a simple structure and reasonable arrangement, so that the fluidizing air can fluidize the powder at the lower end of the riser 20, which greatly reduces the probability of the powder accumulating, sticking to the wall, or blocking at the lower end of the riser 20, so that the powder can flow smoothly, stably and evenly into the mixing chamber and mix with the primary air.

[0039] In this embodiment, by setting a first fluidizing pipe 50 to deliver fluidizing air to the powder silo 10 near the powder outlet 101, and a second fluidizing pipe 60 to deliver fluidizing air to the riser 20 near the lower end, the powder can be effectively prevented from accumulating or clumping on the inner wall of the lower end of the powder silo 10 and the inner wall of the riser 20 at the connection with the mixing chamber during the process of the powder being fed from the powder silo 10 to the air-powder mixer 30. This allows the powder to be fed into the mixing chamber more stably, reliably and smoothly, so that the powder feeding system 100 of the medium-storage coal-fired boiler can feed more stably, reliably and smoothly, thereby ensuring a stable supply of pulverized coal to the coal-fired boiler and making the operation of the coal-fired boiler more stable.

[0040] According to the embodiment of the present invention, the smooth coal pulverization system 100 for a medium-storage coal-fired boiler is provided with a first fluidizing pipe 50 and a second fluidizing pipe 60. The first fluidizing pipe 50 delivers fluidizing air into the pulverized coal silo 10, and the second fluidizing pipe 60 delivers fluidizing air into the riser 20. This effectively avoids the accumulation and clumping of pulverized coal at the outlet 101 of the pulverized coal silo 10 and at the lower end of the riser 20, allowing the pulverized coal to be discharged more stably and smoothly from the pulverized coal silo 10 into the air-coal mixer 30 to mix with the primary air. This makes the discharge of pulverized coal more stable and smooth, thereby ensuring a stable and reliable supply of pulverized coal to the coal-fired boiler and making the operation of the coal-fired boiler more stable.

[0041] In some embodiments of this utility model, such as Figure 1 As shown, the first fluidizing tube 50 can be along the horizontal direction (e.g., Figure 1 (Extends in the front-to-back direction as shown).

[0042] In this embodiment, the first fluidizing tube 50 is configured to extend in the horizontal direction, which is simple in structure and facilitates the assembly and arrangement of the first fluidizing tube 50 and the powder hopper 10.

[0043] In some embodiments of this utility model, the first fluidizing tube 50 may extend obliquely toward the powder outlet 101 in a downward direction.

[0044] In this embodiment, the first fluidizing pipe 50 is configured to extend obliquely towards the powder outlet 101 from top to bottom, so that the fluidizing air entering the powder silo 10 can flow towards the powder outlet 101. The fluidizing air can more stably and effectively fluidize the coal powder in the powder silo 10 near the powder outlet 101, thereby further reducing the probability that the coal powder will accumulate and clump at the powder outlet 101 or adhere to the inner wall and be difficult to fall. At the same time, the flow direction of the fluidizing air is more consistent with the direction of the powder falling, so that the fluidizing air can play a certain guiding role in the falling of the powder, so that the powder can be discharged from the powder silo 10 more stably and smoothly, and the powder discharge is more uniform and stable.

[0045] In some embodiments of this utility model, the second fluidizing tube 60 may extend obliquely toward the riser 20 in a downward direction.

[0046] In this embodiment, the second fluidizing pipe 60 extends inclined towards the riser 20 from top to bottom. The structure is simple and the arrangement is reasonable. The fluidizing air entering the riser 20 can play a good guiding and jetting role for the falling powder while preventing the powder from accumulating and agglomerating. This allows the powder to flow more smoothly into the air-powder mixer 30, making the powder feeding more stable and smooth.

[0047] In one embodiment of this utility model, the angle between the second fluidizing tube 60 and the horizontal direction can be greater than or equal to 45° and less than or equal to 60°.

[0048] In this embodiment, the angle between the second fluidizing pipe 60 and the horizontal direction is set to be greater than or equal to 45°. This allows the second fluidizing pipe 60 to form a large angle with the horizontal direction, effectively preventing the angle from being too small and hindering the powder's fall. This ensures that the fluidizing air flowing into the riser 20 can stably guide and fluidize the powder. In this embodiment, the angle between the second fluidizing pipe 60 and the horizontal direction is set to be less than or equal to 60°. This allows the fluidizing air flowing into the riser 20 to be stably mixed and fluidized in the horizontal direction, and also makes the assembly and arrangement of the second fluidizing pipe 60 and the riser 20 more convenient and easier.

[0049] For example, refer to Figure 1 As shown in the figure, α represents the angle between the second fluidizing tube 60 and the horizontal direction. The angle α can be 45°, 46°, 48°, 50°, 55°, 60°, etc. The angle between the second fluidizing tube 60 and the horizontal direction can be reasonably set according to needs.

[0050] In some embodiments of this utility model, the smooth pulverized coal feeding system 100 of the medium-storage coal-fired boiler may further include: a first regulating valve and a second regulating valve, wherein the first regulating valve is located in the first fluidizing pipe 50 and the second regulating valve is located in the second fluidizing pipe 60.

[0051] In this embodiment, a first regulating valve is installed on the first fluidizing pipe 50. The first regulating valve has a simple structure and reasonable arrangement. The first regulating valve can flexibly adjust the air volume and air pressure in the first fluidizing pipe 50, so that the fluidizing air introduced into the powder hopper 10 can achieve the best fluidization effect on the powder, and the powder can fall more stably, smoothly and evenly. A second regulating valve is installed on the second fluidizing pipe 60. The second regulating valve has a simple structure and reasonable arrangement. The second regulating valve can flexibly adjust the air volume and air pressure in the second fluidizing pipe 60, so that the fluidizing air introduced into the riser 20 can achieve the best fluidization effect on the powder, and the powder can fall more stably, smoothly and evenly into the mixing chamber.

[0052] In some embodiments of this utility model, reference is made to Figure 1 and Figure 2 As shown, the powder mixer 30 may include: a mixer body 31 and a powder discharge pipe 32, the mixer body 31 being arranged along a first direction (e.g., Figure 2 The mixer body 31 extends in the front-back direction and is provided with a mixing chamber. The upper end of the mixing chamber is formed with a powder inlet. The first direction is the first direction in the horizontal direction. The upper end of the powder drop pipe 32 is connected to and communicates with the lower end of the riser 20. The lower end of the powder drop pipe 32 is connected to the powder inlet of the mixer body 31 and communicates with the mixing chamber. The mixer body 31 includes a guide member 311 and a square plate 312. The guide member 311 and the square plate 312 are located at the upper end of the mixer body 31. A powder inlet is formed between the guide member 311 and the square plate 312. The guide member 311 has a guiding part. The guiding part is provided in the mixing chamber. In the first direction, the guiding part is located upstream of the powder inlet in the direction of fluid flow in the mixing chamber.

[0053] In this embodiment, the air-powder mixer 30 is provided with a mixer body 31 and a powder drop pipe 32. The mixing chamber body is provided with a mixing chamber. For example, the mixing chamber can extend along a first direction. The two ends of the mixer body 31 in the first direction are respectively formed as an air inlet and an air outlet. The primary air system 200 can input primary air from the air outlet along the first direction. After the primary air is mixed with the powder in the mixing chamber, it flows out from the air outlet and flows to the burner 300 to participate in combustion.

[0054] The mixer body 31 is provided with a guide member 311 and a square plate 312. The guide member 311 and the square plate 312 are located at the upper end of the mixer body 31 and cooperate to form a powder inlet. The structure is simple and meets the assembly requirements of the air-powder mixer 30 and the riser 20. The guide part of the guide member 311 is located in the mixing chamber and upstream of the powder inlet in the direction of fluid flow in the mixing chamber. The guide part can play a role in blocking the wind at the powder inlet. When the primary air flows to the guide part in the mixing chamber, the primary air flows downward under the action of the guide part and flows through the guide part in the first direction. The primary air can guide the powder falling into the mixing chamber from the powder drop pipe 32, thereby forming a slight negative pressure in the mixing chamber at the powder inlet and in the riser 20 and the powder drop pipe 32, so that the powder can flow into the mixing chamber more stably and reliably from the powder drop pipe 32, thereby making the powder discharge more stable and smooth.

[0055] In one embodiment of this utility model, such as Figure 2 As shown, the guide section can have an air guide surface 3111 and a flow guide surface 3112 formed on both sides in the first direction. In the first direction, the air guide surface 3111 is located on the side of the guide section away from the powder inlet. The air guide surface 3111 is formed as an arc surface that is concave towards the powder inlet. The flow guide surface 3112 extends in the vertical direction.

[0056] In this embodiment, the guide section forms an air guide surface 3111 on the side away from the powder inlet. The air guide surface 3111 is an arc surface that is concave towards the powder inlet. It has a simple structure and can provide a more stable guiding effect for the primary air. This allows the primary air to flow more stably and smoothly downward along the air guide surface 3111, thereby enabling the primary air to better guide the powder and allowing the powder to flow more smoothly into the mixing chamber to mix with the primary air.

[0057] In this embodiment, the guide surface 3112 extends along the first direction, which can effectively avoid the guide part from obstructing the fall of the powder, allowing the powder to fall smoothly and mix with the primary air, thereby enabling the coal-fired boiler to obtain a more stable powder supply to a certain extent.

[0058] In one embodiment of this utility model, such as Figure 2 As shown, the smooth pulverizing system 100 of the medium-storage coal-fired boiler may also include a guide plate 40, which is disposed in the mixing chamber and extends along the first direction. In the vertical direction, the guide plate 40 is located below the pulverizing inlet and is spaced apart from the guide member 311.

[0059] In this embodiment, a guide plate 40 is also provided in the mixing chamber. The guide plate 40 extends along the first direction and is located below the powder inlet and the guide member 311. It has a simple structure and reasonable arrangement. It can evenly distribute the falling powder and reduce the deposition, extend the mixing time of the powder and the primary air, and make the powder and the primary air mix more fully and efficiently, so as to improve the mixing effect of the air-powder mixer 30.

[0060] In some examples of this utility model, the guide plate 40 may be provided with multiple guide holes, and the multiple guide holes are arranged in an array on the guide plate 40, with the guide holes penetrating the guide plate 40 in the vertical direction.

[0061] In this embodiment, the guide plate 40 is provided with multiple guide holes arranged in an array. The guide holes penetrate the guide plate 40 in the vertical direction. The structure is simple and can better guide and mix the primary air flow and powder distribution in the mixing chamber. The primary air can pass through the guide plate 40 through multiple guide holes and mix with the air and powder. The airflow in the guide holes can better disperse the powder, so that the primary air and powder can be mixed more efficiently and evenly. This can reduce the accumulation of powder after it falls in, which may cause the powder to be obstructed. It can make the powder feeding operation more stable, smooth and continuous, so that the powder feeding system 100 of the medium-storage coal-fired boiler can perform feeding operation more stably and smoothly.

[0062] In one example of this invention, the mixer body 31 may also be provided with a guide cylinder, which is disposed inside the mixing chamber and located at the bottom of the mixing chamber. The guide cylinder is located upstream of the guide section in the fluid flow direction in the first direction. This can effectively guide and accelerate the flow of primary air, allowing more primary airflow to pass between the guide section and the guide plate 40, thereby optimizing the flow state of the fluid in the mixing chamber and enabling the primary air to mix more efficiently and thoroughly with the powder.

[0063] The following is for reference. Figure 1 and Figure 2 A boiler system 1000 according to a second aspect embodiment of the present invention is described.

[0064] like Figure 1 and Figure 2 As shown, the boiler system 1000 according to an embodiment of the present invention includes: a primary air system 200 and a burner 300, as well as a medium-storage coal-fired boiler smooth pulverized coal feeding system 100 according to a first aspect embodiment of the present invention. The primary air system 200 is used to supply primary air to the air-coal mixer 30, the first fluidizing pipe 50 and the second fluidizing pipe 60. The outlet of the air-coal mixer 30 is connected to the burner 300.

[0065] According to the boiler system 1000 of this utility model embodiment, by setting up the smooth coal pulverization system 100 of the medium-storage coal-fired boiler of the first aspect embodiment, by setting up the first fluidizing pipe 50 and the second fluidizing pipe 60, the first fluidizing pipe 50 delivers fluidizing air into the pulverized coal silo 10, and the second fluidizing pipe 60 delivers fluidizing air into the riser 20, which effectively avoids the accumulation and agglomeration of pulverized coal at the outlet 101 of the pulverized coal silo 10 and the lower end of the riser 20, so that the pulverized coal can be discharged more stably and smoothly from the pulverized coal silo 10 into the air-coal mixer 30 to mix with the primary air, making the discharge of pulverized coal more stable and smooth, thereby enabling the coal-fired boiler to obtain a stable and reliable supply of pulverized coal, and making the operation of the coal-fired boiler more stable.

[0066] In some embodiments of this utility model, the primary air system 200 can be connected to the first fluidizing pipe 50 and the second fluidizing pipe 60. The primary air system 200 supplies fluidizing air to the first fluidizing pipe 50 and the second fluidizing pipe 60. This allows the first fluidizing pipe 50 and the second fluidizing pipe 60 to utilize the existing primary air system 200 for fluidization operations, thereby significantly reducing the need for additional air supply equipment. This results in a smaller number of devices in the smooth coal feeding system 100 for medium-density coal-fired boilers. Consequently, the smooth coal feeding system 100 for medium-density coal-fired boilers can be easily modified and set up based on the original feeding system. For example, modifications and adjustments can be made during equipment maintenance, resulting in lower construction costs for the smooth coal feeding system 100 for medium-density coal-fired boilers, making it suitable for practical application and promotion.

[0067] Other configurations and operations of the boiler system 1000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0068] The following will refer to Figure 1 and Figure 2 A boiler system 1000 according to a specific embodiment of the present invention is described.

[0069] like Figure 1 and Figure 2 As shown, the boiler system 1000 includes a primary air system 200, a burner 300, and a coal pulverizer feeding system 100 for a medium-storage coal-fired boiler.

[0070] The smooth pulverized coal feeding system 100 for a medium-density coal-fired boiler includes a pulverized coal bin 10, a riser 20, an air-coal mixer 30, a first fluidizing pipe 50, a second fluidizing pipe 60, and a guide plate 40. The lower end of the pulverized coal bin 10 is formed as a pulverized coal outlet, which has a pulverized coal outlet 101. The air outlet of the first fluidizing pipe 50 is connected to the pulverized coal outlet and communicates with the pulverized coal bin 10. The air-coal mixer 30 includes a mixer body 31 and a pulverized coal drop pipe 32. The mixer body 31 extends along a first direction and has a mixing chamber. The upper end of the mixer body 31 is provided with a front tongue plate 313, a guide member 311, a square plate 312, and a rear tongue plate 314 in sequence along the first direction and the flow direction of the fluid in the mixing chamber. The guide member 311 and the square plate 312 cooperate to form a pulverized coal inlet. The guide plate 40 extends along the first direction and is located in the mixing chamber. The guide plate 40 is located below the pulverized coal inlet. The powder drop pipe 32 is funnel-shaped, and its lower end is connected to and communicates with the powder inlet. The riser 20 extends in the vertical direction and its two ends are connected to and communicate with the powder outlet 101 and the upper end of the powder drop pipe 32, respectively. The air outlet of the second fluidizing pipe 60 is connected to and communicates with the lower side wall of the riser 20. The primary air fan of the primary air system 200 can deliver fluidizing air to the first fluidizing pipe 50 and the second fluidizing pipe 60 and deliver primary air to the mixing chamber.

[0071] The first fluidizing pipe 50 and the powder hopper 10 can be made of the same material. The first fluidizing pipe 50 is welded to the powder hopper 10. The diameter of the first fluidizing pipe 50 is 20mm and the length is 300mm. The riser 20 is made of the same material as the powder hopper 10. The riser 20 is welded to the powder hopper 10. The length of the riser 20 is 1000mm, and the diameter of the riser 20 matches the size of the powder outlet 101. The front tongue plate 313 of the air-powder mixer 30 has an angle of 15° with the horizontal direction, and the rear tongue plate 314 has an angle of 15° with the horizontal direction. The length of both the front tongue plate 313 and the rear tongue plate 314 is 300mm, and both the front tongue plate 313 and the rear tongue plate 314 are made of stainless steel. The guide plate 40 is a single-slide plate, and the length of the guide plate 40 is... The diameter is 350mm and the width is 50mm. The guide plate 40 is made of stainless steel. The lower end diameter of the powder drop pipe 32 is 100mm and the upper end diameter is 200mm. The powder drop pipe 32 is made of stainless steel and the installation angle between the powder drop pipe 32 and the horizontal plane is 60°. The guide component 311 is made of stainless steel and a throat is formed between the guide part of the guide component 311 and the guide plate 40. In the vertical direction, the distance between the guide plate 40 and the bottom wall of the mixer body 31 is 300mm, and the distance between the guide plate 40 and the top wall of the mixer body 31 is 300mm. The throat size formed between the lower end of the guide part and the guide plate 40 is 80mm. The diameter of the second fluidizing pipe 60 is 20mm and the length is 300mm.

[0072] When the boiler system 1000 is operating, the primary air system 200 introduces primary air into the air-coal mixer 30, and the pulverized coal feeding system 100 of the medium-storage coal-fired boiler operates. The primary air system 200 introduces hot primary air into the first fluidizing pipe 50 and the second fluidizing pipe 60 respectively. The fluidizing air in the first fluidizing pipe 50 enters the pulverized coal silo 10 through the air distribution plate and is close to the pulverized coal outlet 101 of the silo 10. The fluidizing air fluidizes the pulverized coal near the pulverized coal outlet 101 of the silo 10, increasing the fluidization intensity of the pulverized coal to prevent it from agglomerating or adhering to the inner wall of the silo 10. Under the influence of gravity and the guiding effect of the fluidizing air, the pulverized coal falls into the riser 20 and flows to the lower end of the riser 20. The fluidizing air in the fluidizing pipe 60 flows into the riser 20 to fluidize and guide the powder, preventing the powder from accumulating and clumping at the lower end of the riser 20 or adhering to the pipe wall and blocking the pipeline. Under the action of gravity and fluidizing air, the powder flows from the riser 20 into the powder drop pipe 32. The guide component 311 and the guide plate 40 cooperate to guide the primary air at the powder drop port 301, so that the powder can flow smoothly into the mixing chamber along the powder drop pipe 32 and mix efficiently with the primary air. The coal powder airflow formed after mixing flows out from the air-coal mixer 30 to the burner 300 to participate in combustion. The flow velocity of the coal powder airflow can be determined according to the coal quality, etc., and is preferably between 15m / s and 30m / s.

[0073] In this embodiment, by setting a first fluidizing pipe 50 to deliver fluidizing air to the powder outlet 101 of the powder silo 10, it is possible to effectively prevent powder from agglomerating or clogging at the powder outlet 101. Similarly, a second fluidizing pipe 60 delivers fluidizing air into the riser 20, effectively preventing powder from agglomerating and clumping within the riser 20, or from adhering to the pipe wall and clogging the riser 20. The first and second fluidizing pipes 50 and 60, respectively, deliver fluidizing air to the powder silo 10 and riser 20, respectively, which effectively guides and disperses the powder, allowing it to flow more stably and smoothly into the mixing chamber. This ensures more thorough, efficient, and uniform mixing of the powder and primary air, thereby providing a stable and continuous supply of powder to the coal-fired boiler. This effectively meets the operational needs of a 1000°C deep peak-shaving coal-fired power plant boiler system. The first and second fluidizing pipes 50 and 60 have simple structures, require few additional components, are inexpensive, and reliably meet the need for smooth material feeding. They are also easy to install and debug.

[0074] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0076] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A smooth pulverized coal feeding system for a medium-storage coal-fired boiler, characterized in that, include: The powder hopper (10) and the riser (20) are provided. The lower end of the powder hopper (10) is formed as a powder outlet end, and the powder outlet end is provided with a powder outlet (101). The riser (20) extends in the vertical direction, and the upper end of the riser (20) is connected to and communicates with the powder outlet (101). A powder mixer (30) has a mixing chamber. The powder mixer (30) is located on the lower side of the riser (20). The lower end of the riser (20) is connected to the powder mixer (30) and communicates with the mixing chamber. A first fluidizing tube (50) is connected to the powder outlet end and is used to deliver fluidizing air into the powder hopper (10). The second fluidizing pipe (60) is connected to and communicates with the lower end of the riser (20). The second fluidizing pipe (60) is used to deliver fluidizing air into the riser (20).

2. The gravity fed pulverizing system for coal fired boilers as claimed in claim 1 wherein, The first fluidizing tube (50) extends horizontally, or the first fluidizing tube (50) extends obliquely toward the powder outlet (101) in a downward direction.

3. The smooth pulverized coal feeding system for a medium-storage coal-fired boiler according to claim 1, characterized in that, The second fluidizing tube (60) extends obliquely toward the riser (20) in a downward direction.

4. The gravity-fed pulverized coal boiler system of claim 3, wherein the coal storage bin is a hopper. The angle between the second fluidizing tube (60) and the horizontal direction is greater than or equal to 45° and less than or equal to 60°.

5. The gravity-fed pulverized coal boiler system according to any one of claims 1-4, wherein, Also includes: A first regulating valve and a second regulating valve, wherein the first regulating valve is located in the first fluidizing pipe (50) and the second regulating valve is located in the second fluidizing pipe (60).

6. The gravity-fed pulverized coal boiler system according to any one of claims 1-4, wherein, The air-powder mixer (30) includes: The mixer body (31) extends along a first direction and is provided with the mixing chamber. The upper end of the mixing chamber is formed with a powder inlet. The first direction is a first direction within the horizontal direction. A powder discharge pipe (32) is provided, the upper end of which is connected to and communicates with the lower end of the riser pipe (20). The lower end of the powder discharge pipe (32) is connected to the powder inlet of the mixer body (31) and communicates with the mixing chamber. The mixer body (31) includes a flow guide (311) and a square plate (312). The flow guide (311) and the square plate (312) are located at the upper end of the mixer body (31). The powder inlet is formed between the flow guide (311) and the square plate (312). The flow guide (311) has a flow guiding portion, which is disposed in the mixing chamber. In the first direction, the flow guiding portion is disposed upstream of the powder inlet in the direction of fluid flow in the mixing chamber.

7. The gravity-fed pulverized coal boiler system of claim 6, wherein the coal storage bin is a hopper. The flow guide has an air guide surface (3111) and a flow guide surface (3112) formed on both sides of the first direction. In the first direction, the air guide surface (3111) is located on the side of the flow guide away from the powder inlet. The air guide surface (3111) is formed as an arc surface that is concave towards the powder inlet. The flow guide surface (3112) extends along the vertical direction.

8. The gravity fed pulverizing system for coal fired boilers as claimed in claim 6 wherein, It also includes a guide plate (40), which is disposed in the mixing chamber. The guide plate (40) extends along the first direction. In the vertical direction, the guide plate (40) is located below the powder inlet and is spaced apart from the guide member (311).

9. The gravity-fed pulverized coal boiler system of claim 8, wherein the coal storage bin is a hopper. The guide plate (40) is provided with a plurality of guide holes, and the plurality of guide holes are arranged in an array on the guide plate (40), and the guide holes penetrate the guide plate (40) along the vertical direction.

10. A boiler system characterized by, include: Primary air system (200) and burner (300); According to any one of claims 1-9, the primary air system (200) of the medium-storage coal-fired boiler smooth pulverizing system is used to supply primary air to the air-coal mixer (30), the first fluidizing pipe (50) and the second fluidizing pipe (60), and the outlet of the air-coal mixer (30) is connected to the burner (300).

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