Centrifugal high-concentration-ratio double-adjustable pulverized coal distributor

Abstract

The utility model relates to the field of dense-thin separation of pulverized coal, in particular to a centrifugal high-concentration-ratio double-adjustable pulverized coal distributor. The two ends of the main pipeline are connected with an inlet section and an outlet section respectively, the outer end of the outlet section is connected with a first outlet pipe, a second outlet pipe penetrates through the side face of the outlet section, the inner end of the second outlet pipe extends to be flush with the inner end of the outlet section and is coaxially arranged, and a rotational flow adjusting mechanism is arranged in the end, close to the inlet section, of the main pipeline. And an air volume adjusting mechanism is arranged in the second outlet pipe. When the opening degree of the rotational flow adjusting mechanism is changed, the rotational flow strength can be enhanced or weakened, the pulverized coal concentration is promoted to form a distribution state with the inner portion being thick and the outer portion being light through the centrifugal effect, the first outlet pipe is a thick-phase airflow side, and the second outlet pipe is a light-phase airflow side; according to the air volume adjusting device, the thick-thin separation ratio and the air volume can be adjusted according to the requirements of a specific boiler, and the combustion requirements of the boiler are met.

Description

Technical Field

[0001] This utility model relates to the field of coal powder concentration separation, specifically a centrifugal high-concentration-ratio dual adjustable coal powder distributor. Background Technology

[0002] In the field of boiler combustion technology, a rich-lean separation device is a widely used power device that separates an air-coal mixture in a certain proportion. It divides the primary air-coal gas flow into two streams: a rich phase gas flow that is easy to ignite and burns in a low-oxygen environment, and a lean phase gas flow that supports subsequent combustion and replenishes oxygen. This achieves staged combustion, improves the ignition characteristics of low-quality coal, reduces NOx emissions, and enhances the boiler's stable combustion capability and low-load operation capability.

[0003] Public document 202323605804.8 discloses a pulverized coal concentration-lean separation device, which includes a separation elbow with an inlet separation guide structure and an outlet separation guide structure. The outlet separation guide structure includes multiple outlet separation baffles, including an upper fixed outlet separation baffle, a lower fixed outlet separation baffle, and at least one adjustable outlet separation baffle. The inlet separation guide structure includes a single-stage inlet separation baffle or multiple-stage inlet separation baffles, with the multi-stage inlet separation baffle including a first-stage fixed inlet separation baffle and other stages of adjustable inlet separation baffles. Although the structure in the aforementioned public document has a long service life and is safe and reliable, it cannot achieve a large concentration ratio adjustment when the boiler requires a high concentration-lean separation ratio such as an air ratio of 6:4 and a pulverized coal ratio of 8:2 at the two outlets, thus failing to meet the combustion requirements of specific boilers. Utility Model Content

[0004] The present invention aims to solve the above problems and thus provide a centrifugal high-concentration-ratio dual adjustable pulverized coal distributor that meets the combustion requirements of boilers.

[0005] The technical solution adopted by this utility model to solve the aforementioned problem is:

[0006] A centrifugal high-concentration-ratio dual adjustable pulverized coal distributor includes a main pipeline with an inlet section and an outlet section connected to its two ends respectively. The outer end of the outlet section is connected to a first outlet pipe, and a second outlet pipe runs through the side of the outlet section. The inner end of the second outlet pipe extends to be flush with and coaxial with the inner end of the outlet section. A swirl regulating mechanism is installed in the end of the main pipeline near the inlet section, and an air volume regulating mechanism is installed in the second outlet pipe.

[0007] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are:

[0008] The opening of the swirl regulating mechanism can be flexibly adjusted. When the opening of the swirl regulating mechanism changes, the intensity of the swirl can be enhanced or weakened. Centrifugal force is used to promote the coal powder concentration to form a distribution state of rich inside and light outside. The first outlet pipe is the rich phase airflow side, and the second outlet pipe is the light phase airflow side. The airflow between the two outlet pipes can be regulated by adjusting the opening of the airflow regulating mechanism. This utility model can adjust the rich-light separation ratio and airflow according to the specific needs of the boiler to meet the combustion requirements of the boiler.

[0009] As a preferred embodiment, a further technical solution of this utility model is:

[0010] Furthermore, the swirl adjustment mechanism includes a first rotating shaft that passes through the main pipe at equal intervals along the circumference. The first rotating shaft is rotatably connected to the main pipe. A first driving member is connected to the outer end of the first rotating shaft. Adjustment blades are provided on the first rotating shaft and located inside the main pipe.

[0011] Furthermore, the air volume regulating mechanism includes a second rotating shaft that passes through the side wall of the second outlet pipe, the second rotating shaft is rotatably connected to the second outlet pipe, a second driving member is connected to the outer end of the second rotating shaft, and an adjusting baffle is provided on the second rotating shaft and located inside the second outlet pipe.

[0012] Furthermore, both the inlet and outlet sections are reducers. Attached Figure Description

[0013] Figure 1 This is a front view schematic diagram of the pipe connection relationship in an embodiment of this utility model;

[0014] Figure 2 This is a side view cross-sectional structural schematic diagram showing the relative positions of the pipe, the air volume regulating mechanism, and the swirl regulating mechanism in an embodiment of this utility model.

[0015] Figure 3 This is a top view of the adjusting baffle according to an embodiment of the present invention;

[0016] The following are marked in the diagram: Main pipe 1, Inlet section 2, Outlet section 3, First outlet pipe 4, Second outlet pipe 5, Adjusting vane 6, Adjusting baffle 7, First rotating shaft 8. Detailed Implementation

[0017] The present invention will be further described below with reference to embodiments, the purpose of which is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0018] A centrifugal high-concentration-ratio dual adjustable pulverized coal distributor includes a main pipe 1, with an inlet section 2 and an outlet section 3 connected to both ends of the main pipe 1. A mixture of pulverized coal and air enters the main pipe 1 through the inlet section 2. A first outlet pipe 4 is connected to the outer end of the outlet section 3, and a second outlet pipe 5 runs through the side of the outlet section 3. The inner end of the second outlet pipe 5 extends to be flush with and coaxial with the inner end of the outlet section 3. A swirling flow regulating mechanism is installed in the end of the main pipe 1 near the inlet section 2, and an airflow regulating mechanism is installed in the second outlet pipe 5. The first outlet pipe 4 is used to discharge the dense phase airflow, and the second outlet pipe 5 discharges the depleted phase airflow. By flexibly adjusting the opening of the swirling flow regulating mechanism, the swirling intensity of the pulverized coal and air mixture in the main pipe 1 can be changed. When the swirling intensity increases, the pulverized coal particles are subjected to a greater centrifugal force and are thrown towards the vicinity of the outer wall of the main pipe 1, forming a distribution state of depleted inside and dense outside. Conversely, when the swirling intensity decreases, the distribution state of the pulverized coal particles will also change accordingly. The air volume regulating mechanism can change the air volume of the pulverized coal airflow through the second outlet pipe 5. In this way, the air volume ratio between the two outlet pipes can be flexibly adjusted according to the specific needs of the boiler, thereby meeting the boiler combustion requirements for the rich-lean separation ratio.

[0019] Furthermore, the swirl regulating mechanism includes a first rotating shaft 8 that passes through the main pipe 1 at equal intervals along the circumference. The first rotating shaft 8 is rotatably connected to the main pipe 1. Regulating blades 6 are arranged on the first rotating shaft 8 and inside the main pipe. A first driving component, which is a drive motor, is connected to the outer end of the first rotating shaft. The regulating blades 6 can be fan-shaped, rectangular, or propeller-shaped. In this embodiment, fan-shaped blades are used. The first rotating shaft 8 is located in the middle of the regulating blades 6. The portions of the regulating blades 6 located on both sides of the first rotating shaft 8 are symmetrical. The opening of the regulating blades 6 is controlled by rotating the first rotating shaft 8. Through simulation tests, when the diameter of the main pipe 1 is less than 400mm, 2-4 regulating blades 6 are optimal; when the diameter of the main pipe 1 is between 400-600mm, 5-6 regulating blades 6 are optimal; and when the diameter of the main pipe 1 is greater than 600mm, 7-10 regulating blades 6 are optimal, which can meet the combustion requirements of the boiler.

[0020] Furthermore, the air volume regulating mechanism includes a second rotating shaft that passes through the side wall of the second outlet pipe 5. The second rotating shaft is rotatably connected to the second outlet pipe 5. A second driving component is connected to the outer end of the second rotating shaft. The first driving component is a drive motor. An adjusting baffle 7 is provided on the second rotating shaft and located inside the second outlet pipe 5. The adjusting baffle 7 is rectangular. The opening degree of the adjusting baffle 7 is controlled by rotating the second rotating shaft.

[0021] Furthermore, both inlet section 2 and outlet section 3 are reducing pipes. The diameter of the pipes on the side of inlet section 2 and outlet section 3 closer to the main pipe 1 is larger. The reducing pipes can adapt to different coal powder flow and pressure requirements, ensuring that the coal powder can smoothly enter the distributor and form a stable concentration-lean separation state in outlet section 3.

[0022] The opening of the regulating blade 6 can be flexibly adjusted. When the opening of the regulating blade 6 changes, the intensity of the swirl can be enhanced or weakened. Centrifugal force is used to promote the coal powder concentration to form a distribution state of rich inside and light outside. The first outlet pipe 4 is the rich phase airflow side, and the second outlet pipe 5 is the light phase airflow side. The air volume between the two outlet pipes can be adjusted by adjusting the opening of the baffle 7. This utility model can adjust the rich-light separation ratio and air volume according to the specific needs of the boiler to meet the combustion requirements of the boiler.

[0023] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A centrifugal high concentration ratio double adjustable pulverized coal distributor comprising a main duct, characterized in that: The main pipeline is connected with an inlet section and an outlet section at two ends respectively, the outer end of the outlet section is connected with a first outlet pipe, a second outlet pipe is penetrated through the side surface of the outlet section, the inner end of the second outlet pipe extends to be flush with and coaxial with the inner end of the outlet section, a cyclone adjusting mechanism is arranged in the end of the main pipeline close to the inlet section, and a wind volume adjusting mechanism is arranged in the second outlet pipe.

2. The centrifugal high concentration ratio double adjustable pulverized coal distributor according to claim 1, characterized in that: The cyclone adjusting mechanism comprises first rotating shafts which are penetrated through the main pipeline at equal intervals in the circumferential direction, the first rotating shafts are rotationally connected with the main pipeline, the outer ends of the first rotating shafts are connected with first driving members, and adjusting blades are arranged on the first rotating shafts and in the main pipeline.

3. The centrifugal high concentration ratio double adjustable coal distributor according to claim 1, characterized in that: The wind volume adjusting mechanism comprises a second rotating shaft which is penetrated through the side wall of the second outlet pipe, the second rotating shaft is rotationally connected with the second outlet pipe, the outer end of the second rotating shaft is connected with a second driving member, and an adjusting baffle is arranged on the second rotating shaft and in the second outlet pipe.

4. The centrifugal high concentration ratio double adjustable coal distributor according to claim 1, characterized in that: The inlet section and the outlet section are variable-diameter pipes.

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