Return feeder adjusting device of biomass circulating fluidized bed boiler

Abstract

The utility model discloses a biomass circulating fluidized bed boiler return feeder adjusting device which comprises a return feeder body, the return feeder body is composed of two air chamber parts with independent functions, each air chamber part comprises a fluidization air chamber and a return air chamber, and a discharge inclined pipe of the return feeder body is fixedly connected with a circulating fluidized bed boiler. A vertical pipe on the material returning device body is connected with a cyclone separator, the material returning device body comprises a driving adjusting structure, the driving adjusting structure comprises a fluidization air pipe and a material returning air pipe which are connected with the fluidization air chamber and the material returning air chamber respectively, and the driving adjusting structure further comprises an independent side blowing pipe bypass. The independent side blowing pipe bypass is fed into the material returning device body from the side face of the fluidization air pipe, and the fluidization air pipe and the material returning air pipe are led into the material returning device body from the bottom of the material returning device body and are respectively connected with an external fan.

Description

Technical Field

[0001] This utility model belongs to the technical field of biomass circulating fluidized bed boilers, specifically relating to a biomass circulating fluidized bed boiler feeder adjustment device. Background Technology

[0002] A circulating fluidized bed boiler system typically consists of a furnace, separator, return feeder, tail-end heating surface, and auxiliary equipment. The furnace, separator, and return feeder form a material circulation system. Fine solid particles carried out of the furnace by the flue gas are separated by the separator and then returned to the furnace by the return feeder for recirculation and combustion, thereby improving the boiler's combustion efficiency. Its function is to ensure the transport of circulating material from the negative pressure zone to the positive pressure zone, while also ensuring that the flue gas sealed in the furnace flows back through the fly ash circulation loop to the separator.

[0003] A return feeder typically consists of a circular cross-section descending section (vertical pipe), a rectangular ascending section, and a return pipe connected sequentially. The descending section is connected to the separator, and the return pipe is connected to the furnace. A tongue plate is provided between the descending and ascending sections, and their lower parts are connected. An overflow weir is provided between the ascending section and the return pipe, and their upper parts are connected. A return bed is set at the bottom of the descending and ascending sections, and a return air chamber is set at the bottom of the return bed. The high-temperature circulating ash collected from the high-temperature separator is accumulated to a certain height in the return feeder's vertical pipe and sealed to prevent furnace flue gas from flowing back into the separator. During operation, a return fan introduces fluidizing air at the bottom of the return bed. The loosening air blown out by the air distribution plate and the return air fluidize the material collected by the separator. Under the action of the pressure difference between the vertical pipe and the furnace, a large amount of high-temperature circulating ash collected by the separator is continuously returned to the furnace.

[0004] When ash flows through the riser of the return feeder with a small diameter, it can cause sedimentation, leading to ash coking and bridging, which can cause blockage of the return feeder and affect the normal operation of the boiler. In addition, since most of the existing U-shaped return feeders have relatively uniform air caps on the bed, and the return air is sent in from one side, there will inevitably be a situation where the pressure on the left side of the air chamber is lower than that on the right side. In other words, the air output of the left air cap is less than that of the right side. After six months or more of operation, the aperture of the air cap is worn larger, and the situation where the pressure on the left side of the air chamber is lower than that on the right side becomes more prominent. When the pressure on the left side drops to a certain level, ash will accumulate on the upper part and the inner side of the baffle of the U-shaped return feeder.

[0005] In view of the above factors, a biomass circulating fluidized bed boiler return feeder adjustment device is provided. The independent side blowing pipe bypass plays a driving role in the operation of the fluidized bed return feeder and the control and adjustment of the solid particle circulation volume, providing the main driving force for the solid particles to pass through the orifice. The return feeder body is actually composed of two functionally independent parts, including a fluidizing air chamber and a return air chamber. The fluidizing air chamber ensures and enhances the fluidization ability of the material, making the material more like a fluid with flowing characteristics. The return air chamber ensures that the pressure loss of the material from the air cap to the inlet of the inclined tube in the furnace is overcome, ensuring that the material can smoothly enter the inlet of the inclined tube and then enter the furnace. Utility Model Content

[0006] The purpose of this invention is to provide a regulating device for a biomass circulating fluidized bed boiler feeder, in order to solve the problems mentioned in the background art.

[0007] The purpose of this utility model is achieved through the following technical solution: a biomass circulating fluidized bed boiler return feeder adjustment device, including a return feeder body, the return feeder body is composed of two functionally independent air chamber parts, the air chamber parts include a fluidization air chamber and a return air chamber, the discharge inclined pipe of the return feeder body is fixedly connected to the circulating fluidized bed boiler, and the vertical pipe on the return feeder body is connected to a cyclone separator.

[0008] The return material unit body includes a drive adjustment structure, which includes a fluidizing air duct and a return material duct respectively connected to the fluidizing air chamber and the return material air chamber.

[0009] The drive adjustment structure also includes an independent side blowing pipe bypass, which is fed into the return material body from the side of the fluidizing air duct.

[0010] Furthermore, the fluidizing air duct and the return air duct are introduced from the bottom of the return material body, and the fluidizing air duct and the return air duct are respectively connected to an external fan;

[0011] The fluidizing air chamber and the return air chamber are respectively equipped with air distribution plates, and air caps are provided on the air distribution plates. The fluidizing air duct and the return air duct are equipped with regulating valves.

[0012] The independent side-blowing pipe bypass is located on one side of the fluidizing air chamber of the return material body.

[0013] Furthermore, a partition is provided on the body of the return feeder, the partition including a first partition and a second partition, the first partition being close to the riser and aligned with the boundary of the air distribution plate on the fluidizing air duct;

[0014] The second baffle extends upward on one side of the discharge inclined tube.

[0015] Furthermore, the upper end face of the second partition is on the same horizontal line as the lower end face of the first partition;

[0016] Alternatively, the upper surface of the second partition and the lower surface of the first partition may not be on the same horizontal line.

[0017] Furthermore, the return air chamber corresponding to the discharge slant pipe is provided with an inclined surface.

[0018] Furthermore, the width of the return air chamber is twice the width of the fluidization air chamber.

[0019] Furthermore, rotor flow meters are installed on the fluidizing air duct and the return air duct;

[0020] A rotor flow meter is installed on the bypass of the independent side blow pipe.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] The main body of this utility model's return feeder is actually composed of two functionally independent parts: a fluidizing air chamber and a return air chamber. The fluidizing air chamber ensures and enhances the fluidization capability of the material, making it flow more like a fluid. The return air chamber ensures that the pressure loss from the height of the material from the air cap to the inlet of the inclined tube in the furnace is overcome, ensuring that the material can smoothly enter the inclined tube inlet and then enter the furnace. The power for material return in the return feeder body comes from the different air distribution in the rising section and the falling section of the return feeder, so that the rising section and the falling section present different fluidization states.

[0023] The independent side-blowing bypass of this invention plays a driving role in the operation of the fluidized bed return feeder and the control and adjustment of the solid particle circulation volume. It provides the main driving force for the solid particles to pass through the orifice. For the flow of solid particles through the orifice, the blowing of the independent side-blowing bypass works in coordination with the air chamber. By adjusting the air volume of the independent side-blowing bypass, the return feeder can be operated stably.

[0024] This utility model features air distribution plates installed in the fluidized air chamber and the return air chamber, with air caps on the air distribution plates. Regulating valves are installed on the fluidized air duct and the return air duct. The aforementioned regulating valves adjust the air volume of the fluidized air chamber and the return air chamber, working in conjunction with the independent side-blowing pipe bypass to promote the material to enter the biomass circulating fluidized bed boiler through the discharge inclined pipe. Attached Figure Description

[0025] Figure 1 This is a schematic diagram showing the connection between the return feeder body and the biomass circulating fluidized bed boiler of this utility model;

[0026] Figure 2 This is a schematic diagram of the connection between the fluidizing air duct and the return air duct of this utility model;

[0027] Figure 3 This is a schematic diagram of another state of this utility model. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] like Figure 1-3 As shown, a biomass circulating fluidized bed boiler return feeder adjustment device includes a return feeder body 1, which is composed of two functionally independent air chambers, including a fluidizing air chamber 2 and a return air chamber 3. The discharge inclined pipe of the return feeder body 1 is fixedly connected to the circulating fluidized bed boiler. The riser 4 on the return feeder body 1 is connected to a cyclone separator. The cyclone separator adopts a structure disclosed in the prior art, which will not be described in detail here.

[0032] The return material body 1 includes a drive adjustment structure, which includes a fluidizing air duct 4 and a return material duct 5 respectively connected to the fluidizing air chamber 2 and the return material air chamber 3.

[0033] The drive adjustment structure also includes an independent side blowing pipe bypass 10, which is fed into the return material body 1 from the side of the fluidizing air pipe 4.

[0034] The fluidizing air chamber 2 and the return air chamber 3 have different hood apertures. The hood aperture of the fluidizing air chamber 2 is 3mm, and the hood aperture of the return air chamber 3 is 5mm.

[0035] In use, an air distribution plate and an air cap are provided at the connection position between the independent side blow pipe bypass 10 and the return material body 1, or the independent side blow pipe bypass 10 is directly extended into the interior of the return material body 1.

[0036] In order to facilitate the setting of an independent side blowing pipe bypass in use to drive the operation of the fluidized bed returner and control and adjust the circulation of solid particles, the fluidizing air pipe 4 and the return air pipe 5 are introduced from the bottom of the returner body 1, and the fluidizing air pipe 4 and the return air pipe 5 are respectively connected to an external fan 6.

[0037] The fluidizing air chamber 2 and the return air chamber 3 are respectively provided with air distribution plates 7, and air caps 8 are provided on the air distribution plates 7. The fluidizing air duct 4 and the return air duct 5 are provided with regulating valves 9.

[0038] The independent side blowing pipe bypass 10 is located on one side of the fluidizing air chamber 2 of the return material body 1.

[0039] In use, in addition to the above-mentioned structure, the air cap 8 is divided into three areas on the air distribution plate 7: the return material area (near the discharge inclined pipe side), the transition area (middle), and the fluidization area (near the riser pipe side). The aperture of the air cap in each area is arranged in the following order: the aperture of the air cap in the return material area is 5mm, the aperture of the transition area is 4mm, and the aperture of the fluidization area is 3mm. Each area corresponds to an independent air chamber using the above structure.

[0040] In order to balance the pressure in different areas by dividing the internal space of the return feeder during use and avoid the interruption or gushing of return caused by local pressure fluctuations, the return feeder body 1 is provided with a partition, which includes a first partition 11 and a second partition 12. The first partition 11 is located near the riser 4 and is aligned with the boundary of the air distribution plate 7 on the fluidizing air duct 4.

[0041] The second partition 12 extends upward on one side of the discharge inclined tube.

[0042] The upper end face of the second partition 12 is on the same horizontal line as the lower end face of the first partition 11;

[0043] Alternatively, the upper end face of the second partition 12 and the lower end face of the first partition 11 may not be on the same horizontal line.

[0044] In order to ensure that the material can be smoothly introduced into the discharge inclined pipe during use, an inclined surface 13 is provided at the position of the return air chamber 3 corresponding to the discharge inclined pipe.

[0045] In order to ensure that the material in the return air chamber 3 does not accumulate during use and to ensure that the material in the fluidizing air chamber flows rapidly in the return air chamber 3 during use, the width of the return air chamber 3 is twice the width of the fluidizing air chamber 2.

[0046] To ensure that the amount of air fed into the fluidized bed return device can be measured by a rotor flow meter during use, rotor flow meters are installed on the fluidized air duct 4 and the return air duct 5.

[0047] A rotor flow meter is installed on the independent side blow pipe bypass 10.

[0048] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A regulating device for a biomass circulating fluidized bed boiler feeder, characterized in that: The return feeder body (1) is composed of two functionally independent air chambers, including a fluidized air chamber (2) and a return air chamber (3). The discharge inclined pipe of the return feeder body (1) is fixedly connected to the circulating fluidized bed boiler, and the riser on the return feeder body (1) is connected to the cyclone separator. The return material body (1) includes a drive adjustment structure, which includes a fluidizing air duct (4) and a return air duct (5) respectively connected to the fluidizing air chamber (2) and the return air chamber (3). The drive adjustment structure also includes an independent side blow pipe bypass (10), which is fed into the return material body (1) from the side of the fluidizing air pipe (4).

2. The biomass circulating fluidized bed boiler return feeder adjustment device according to claim 1, characterized in that: The fluidizing duct (4) and the return duct (5) are introduced from the bottom of the return device body (1), and the fluidizing duct (4) and the return duct (5) are respectively connected to an external fan (6). The fluidizing air chamber (2) and the return air chamber (3) are respectively equipped with air distribution plates (7), and air caps (8) are provided on the air distribution plates (7). The fluidizing air pipe (4) and the return air pipe (5) are equipped with regulating valves (9). The independent side blow pipe bypass (10) is located on one side of the fluidizing air chamber (2) of the return material body (1).

3. The biomass circulating fluidized bed boiler return feeder adjustment device according to claim 2, characterized in that: The return feeder body (1) is provided with a partition, which includes a first partition (11) and a second partition (12). The first partition (11) is close to the riser and is aligned with the boundary of the air distribution plate (7) on the fluidizing air duct (4). The second partition (12) extends upward on one side of the discharge inclined tube.

4. The biomass circulating fluidized bed boiler return feeder adjustment device according to claim 3, characterized in that: The upper end face of the second partition (12) is on the same horizontal line as the lower end face of the first partition (11); Or the upper end face of the second partition (12) and the lower end face of the first partition (11) are not on the same horizontal line.

5. The biomass circulating fluidized bed boiler return feeder adjustment device according to claim 4, characterized in that: An inclined surface (13) is provided at the position of the return air chamber (3) corresponding to the discharge inclined pipe.

6. The biomass circulating fluidized bed boiler return feeder adjustment device according to claim 5, characterized in that: The width of the return air chamber (3) is twice the width of the fluidization air chamber (2).

7. The biomass circulating fluidized bed boiler return feeder adjustment device according to claim 6, characterized in that: Rotor flow meters are installed on the fluidizing duct (4) and the return duct (5); A rotor flow meter is installed on the independent side blow pipe bypass (10).

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