Large-concentration adjusting pulverized coal distributor

Abstract

The utility model relates to the field of pulverized coal concentration separation, in particular to a high-concentration adjusting pulverized coal distributor. Comprising a Y-shaped main pipeline, a first adjusting plate set is arranged in the main pipeline and close to the intersection of two discharging ends, a second adjusting plate set is arranged in the feeding end of the main pipeline and located on the light phase airflow side, and a third adjusting plate set is arranged in the main pipeline and located between the first adjusting plate set and the second adjusting plate set and located on the light phase airflow side. A fourth adjusting plate group is arranged between the second adjusting plate group and the third adjusting plate group in the main pipeline and is positioned on the concentrated phase airflow side; and a fixed blade is arranged between the fourth adjusting plate group and the feeding end in the main pipeline and is positioned on the concentrated phase airflow side. The second adjusting plate set adjusts the flowing track of air powder airflow, the fixed blades adjust the flowing track of air, the fourth adjusting plate set adjusts the flowing track of the air, the first adjusting plate set and the third adjusting plate set adjust the flowing track of powder, and the thick-thin separation ratio required by a specific boiler can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of coal powder concentration separation, and specifically relates to a large-concentration-adjustable coal powder distributor. BACKGROUND

[0002] In the field of boiler combustion technology, the concentration separation device is a widely used power device for separating air and coal powder mixture according to a certain proportion, and the primary air powder flow is divided into two thick and thin phases. The thick phase flow is easy to ignite, and the low-oxygen combustion is low. The thin phase flow supports the subsequent combustion and supplements oxygen, realizes staged combustion, improves the ignition characteristics of low-quality coal, reduces NOx emission, and improves the stable combustion capacity and low-load operation capacity of the boiler.

[0003] The coal powder concentration separation device of the boiler low-nitrogen combustion system is usually arranged, and is mainly divided into three categories according to the structure and principle: one is a cyclone separation device, the disadvantage is that the system resistance is large, and the coal powder flow entering the furnace has residual swirl; the second is a bend offset type separation device, the resistance of the thick and thin separation device is small, and a large arrangement space is generally required; the third is a louver type separation device, the thick and thin separation device is severely worn, and the maintenance workload is large.

[0004] The disclosed document 202323605804.8 discloses a coal powder concentration separation device, which comprises a separation bend, the separation bend is provided with an inlet separation flow guide structure and an outlet separation flow guide structure; the outlet separation flow guide structure comprises a plurality of outlet separation baffles, the plurality of outlet separation baffles comprises an upper fixed outlet separation baffle, a lower fixed outlet separation baffle and at least one adjustable outlet separation baffle; the inlet separation flow guide structure comprises a primary inlet separation baffle or a multi-stage inlet separation baffle, the multi-stage inlet separation baffle comprises a first-stage fixed inlet separation baffle and other-stage adjustable inlet separation baffles. Although the structure in the above disclosed document has a long service life and is safe and reliable. But in the case that the boiler needs a large proportion of thick and thin separation ratio of air ratio 6:4, powder ratio 8:2, etc., the structure in the above disclosed document cannot realize the adjustment of large concentration ratio, that is, it cannot meet the combustion demand of the specific boiler. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the above problems, and provides a concentration-adjustable coal powder distributor that meets the combustion demand of a boiler.

[0006] The utility model solves the problem by adopting the following technical scheme:

[0007] A high-concentration pulverized coal distributor includes a Y-shaped main pipeline. One end of the main pipeline is the feed end, connected to a feed pipe. The other two ends of the main pipeline are discharge ends. A first regulating plate group is installed inside the main pipeline near the junction of the two discharge ends. A second regulating plate group is installed inside the feed end of the main pipeline on the side of the light phase airflow. A third regulating plate group is installed inside the main pipeline between the first and second regulating plate groups on the side of the light phase airflow. A fourth regulating plate group is installed inside the main pipeline between the second and third regulating plate groups on the side of the dense phase airflow. Fixed blades are installed inside the main pipeline between the fourth regulating plate group and the feed end on the side of the dense phase airflow.

[0008] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are:

[0009] After the air-coal airflow enters the main pipeline, the flow trajectory of the air-coal airflow is adjusted by adjusting the tilt angle of the second regulating plate group. The fixed blades mainly adjust and control the flow trajectory of the air. Adjusting the tilt angle of the fourth regulating plate group mainly adjusts and controls the flow trajectory of the air. Adjusting the tilt angles of the first and third regulating plate groups mainly adjusts and controls the flow trajectory of the pulverized coal. This can meet the specific boiler requirements for the rich-lean separation ratio and satisfy the boiler combustion requirements.

[0010] As a preferred embodiment, a further technical solution of this utility model is:

[0011] Furthermore, the main pipeline has a variable diameter structure, and the feed pipe has an asymmetrical cross-section along the axial direction. The side of the feed pipe near the light phase gas flow has an inclined profile, while the other side of the feed pipe has a straight profile.

[0012] Furthermore, a chamfered baffle is provided inside the feed pipe end of the main pipeline and on the side of the light phase gas flow.

[0013] Furthermore, the discharge end of the main pipeline is connected to a discharge bend with its inner arc on the same side.

[0014] Furthermore, the inner walls of the main pipe, feed pipe, and discharge bend are lined with wear-resistant ceramics.

[0015] Furthermore, maintenance windows are provided on the main pipeline.

[0016] Furthermore, the first adjusting plate assembly includes a first rotating shaft that passes through and is rotatably connected to the main pipe. Two first blades are spaced apart on the first rotating shaft. A first rotating handle is provided at one end of the first rotating shaft. A first arc-shaped groove is provided on the outer wall of the main pipe. A first support rod that is slidably connected to the first arc-shaped groove is provided on the inner side of the outer end of the first rotating handle.

[0017] Furthermore, the second adjusting plate assembly includes a second rotating shaft that passes through and is rotatably connected to the main pipe. The second rotating shaft is fitted with second blades that are in clearance fit with the inner walls on both sides of the main pipe. One end of the second rotating shaft is provided with a second rotating handle. The outer wall of the main pipe is provided with a second arc-shaped groove. The inner side of the outer end of the second rotating handle is provided with a second support rod that is slidably connected to the second arc-shaped groove.

[0018] Furthermore, the third adjusting plate assembly includes a third rotating shaft that passes through and is rotatably connected to the main pipe. Three third blades are spaced apart on the third rotating shaft. A third rotating handle is provided at one end of the third rotating shaft. A third arc-shaped groove is provided on the outer wall of the main pipe. A third support rod that is slidably connected to the third arc-shaped groove is provided on the inner side of the outer end of the third rotating handle.

[0019] Furthermore, the fourth adjusting plate assembly includes a fourth rotating shaft that passes through and is rotatably connected to the main pipe. The fourth rotating shaft is fitted with a fourth blade that is clearance-fitted with the inner walls on both sides of the main pipe. One end of the fourth rotating shaft is provided with a fourth rotating handle. The outer wall of the main pipe is provided with a fourth arc-shaped groove. The inner side of the outer end of the fourth rotating handle is provided with a fourth support rod that is slidably connected to the fourth arc-shaped groove. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main cross-sectional structure of an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the dense phase gas flow side in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the light phase airflow side in an embodiment of the present invention;

[0023] The following are marked in the diagram: Main pipe 1, feed pipe 2, discharge bend 3, first adjusting plate group 4, second adjusting plate group 5, third adjusting plate group 6, fourth adjusting plate group 7, fixed blade 8, corner stop 9, maintenance window 10. Detailed Implementation

[0024] 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.

[0025] A high-concentration adjustable pulverized coal distributor includes a Y-shaped main pipe 1, one end of which is the feed end and connected to an inlet pipe 2, and the other two ends of the main pipe 1 are both discharge ends. Figure 1The bottom port of the main pipe 1 is the feed end. The discharge end on the left side of the main pipe 1 is the dense phase gas flow side, and the discharge end on the right side of the main pipe 1 is the light phase gas flow side. A first regulating plate group 4 is installed in the main pipe 1 near the junction of the two discharge ends. A second regulating plate group 5 is installed in the feed end of the main pipe 1 on the light phase gas flow side. A third regulating plate group 6 is installed in the main pipe 1 between the first regulating plate group 4 and the second regulating plate group 5 on the light phase gas flow side. A fourth regulating plate group 7 is installed in the main pipe 1 between the second regulating plate group 5 and the third regulating plate group 6 on the dense phase gas flow side. A fixed blade 8 is installed in the main pipe 1 between the fourth regulating plate group 7 and the feed end on the dense phase gas flow side. The two sides of the fixed blade 8 are connected to the main pipe 1.

[0026] Furthermore, the main pipe 1 has a variable diameter structure, and the feed pipe 2 has an asymmetrical cross-section along the axial direction. The side of the feed pipe 2 closest to the light phase airflow has an inclined profile, while the other side of the feed pipe 2 has a straight profile. The primary air-powder airflow is guided to the dense phase side through the inclined side of the feed pipe 2.

[0027] Furthermore, a corner-cutting block 9 is provided inside the feed pipe 2 of the main pipeline 1 and on the side of the light phase airflow to eliminate the phenomenon of coal powder sticking to the wall.

[0028] Furthermore, the discharge end of the main pipe 1 is connected to a discharge bend 3 with its inner arc located on the same side.

[0029] Furthermore, the inner walls of the main pipe 1, the feed pipe 2, and the discharge bend 3 are lined with wear-resistant ceramics to increase wear resistance and extend the service life of the distributor.

[0030] Furthermore, an inspection window 10 is provided on the main pipeline 1 to facilitate internal cleaning and maintenance of the regulating plate assembly.

[0031] Furthermore, the first adjusting plate group 4 includes a first rotating shaft that passes through and is rotatably connected to the main pipe 1. Two first blades are spaced apart on the first rotating shaft. A first rotating handle is provided at one end of the first rotating shaft. A first arc-shaped groove is provided on the outer wall of the main pipe 1. A first support rod that is slidably connected to the first arc-shaped groove is provided on the inner side of the outer end of the first rotating handle. The angle of the first blades is adjusted by driving the first rotating handle. The first arc-shaped groove limits the movement trajectory of the first support rod. In the main view, one end of the first arc-shaped groove is located at the bottom of the circle where the first arc-shaped groove is located, and the other end of the first arc-shaped groove is located to the right of the center of the circle where the first arc-shaped groove is located. The arc of the first arc-shaped groove is 80°.

[0032] Furthermore, the second adjusting plate assembly 5 includes a second rotating shaft that passes through and is rotatably connected to the main pipe 1. A second blade is fitted on the second rotating shaft and is clearance-fitted with the inner walls on both sides of the main pipe 1. A second rotating handle is provided at one end of the second rotating shaft. A second arc-shaped groove is provided on the outer wall of the main pipe 1. A second support rod is provided on the inner side of the outer end of the second rotating handle and is slidably connected to the second arc-shaped groove. The angle of the second blade is adjusted by driving the second rotating handle. The second arc-shaped groove limits the movement trajectory of the second support rod. In the main view, one end of the second arc-shaped groove is located to the left of the center of the circle, and the angle between the radius of this end of the second arc-shaped groove and the horizontal line passing through the center of the circle is 25°. The other end of the fourth arc-shaped groove is located to the right of the center of the circle, and the arc of the third arc-shaped groove is 75°.

[0033] Furthermore, the third adjusting plate group 6 includes a third rotating shaft that passes through and is rotatably connected to the main pipe 1. Three third blades are spaced apart on the third rotating shaft. A third rotating handle is provided at one end of the third rotating shaft. A third arc-shaped groove is provided on the outer wall of the main pipe 1. A third support rod that is slidably connected to the third arc-shaped groove is provided on the inner side of the outer end of the third rotating handle. The angle of the third blades is adjusted by driving the third rotating handle. The third arc-shaped groove limits the movement trajectory of the third support rod. In the main view, one end of the third arc-shaped groove is located at the bottom of the circle in which the third arc-shaped groove is located, and the other end of the third arc-shaped groove is located to the right of the center of the circle in which the third arc-shaped groove is located. The arc of the third arc-shaped groove is 80°.

[0034] Furthermore, the fourth adjusting plate assembly 7 includes a fourth rotating shaft that passes through and is rotatably connected to the main pipe 1. A fourth blade is fitted on the fourth rotating shaft and is clearance-fitted with the inner walls on both sides of the main pipe 1. A fourth rotating handle is provided at one end of the fourth rotating shaft. A fourth arc-shaped groove is provided on the outer wall of the main pipe 1. A fourth support rod is provided on the inner side of the outer end of the fourth rotating handle and is slidably connected to the fourth arc-shaped groove. The angle of the fourth blade is adjusted by driving the fourth rotating handle. The fourth arc-shaped groove limits the movement trajectory of the fourth support rod. In the main view, one end of the fourth arc-shaped groove is located at the bottom of the circle in which the fourth arc-shaped groove is located, and the other end of the fourth arc-shaped groove is located to the left of the center of the circle in which the fourth arc-shaped groove is located. The arc of the third arc-shaped groove is 80°.

[0035] The blades and fixed blades 8 in the four regulating plate groups are all made of wear-resistant ceramic to increase wear resistance and extend the service life of the distributor.

[0036] After the air-coal airflow enters the main duct 1, the flow trajectory of the air-coal airflow is adjusted by adjusting the tilt angle of the second blade. The fixed blade 8 mainly adjusts and controls the flow trajectory of the air. Adjusting the tilt angle of the fourth blade mainly adjusts and controls the flow trajectory of the air. The fixed blade 8 and the fourth blade have a relatively small effect on the control of the coal flow. Adjusting the tilt angle of the first blade and the third blade mainly adjusts and controls the flow trajectory of the coal. The first blade and the third blade have a relatively small effect on the control of the air flow. This can meet the rich-lean separation ratio required by specific boilers and meet the boiler combustion requirements.

[0037] 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 high-concentration adjustable pulverized coal distributor, characterized in that: The system includes a Y-shaped main pipeline, with one end serving as the feed inlet connected to a feed pipe, and the other two ends serving as discharge outlets. A first regulating plate group is installed inside the main pipeline near the junction of the two discharge outlets. A second regulating plate group is installed inside the feed inlet of the main pipeline on the side of the light phase airflow. A third regulating plate group is installed inside the main pipeline between the first and second regulating plate groups on the side of the light phase airflow. A fourth regulating plate group is installed inside the main pipeline between the second and third regulating plate groups on the side of the dense phase airflow. Fixed blades are installed inside the main pipeline between the fourth regulating plate group and the feed inlet on the side of the dense phase airflow.

2. The high-concentration adjustable pulverized coal distributor according to claim 1, characterized in that: The main pipeline has a variable diameter structure, and the feed pipe has an asymmetrical cross-section along the axial direction. The side of the feed pipe near the light phase gas flow has an inclined profile, while the other side of the feed pipe has a straight profile.

3. The high-concentration adjustable pulverized coal distributor according to claim 1, characterized in that: A chamfered baffle is installed inside the feed pipe end of the main pipeline and on the side of the light phase airflow.

4. The high-concentration adjustable pulverized coal distributor according to claim 1, characterized in that: The discharge end of the main pipeline is connected to a discharge bend with its inner arc on the same side.

5. The high-concentration adjustable pulverized coal distributor according to claim 4, characterized in that: The inner walls of the main pipe, feed pipe and discharge bend are lined with wear-resistant ceramics.

6. The high-concentration adjustable pulverized coal distributor according to claim 1, characterized in that: Inspection windows are provided on the main pipeline.

7. The high-concentration adjustable pulverized coal distributor according to claim 1, characterized in that: The first adjusting plate assembly includes a first rotating shaft that passes through and is rotatably connected to the main pipe. Two first blades are spaced apart on the first rotating shaft. A first rotating handle is provided at one end of the first rotating shaft. A first arc-shaped groove is provided on the outer wall of the main pipe. A first support rod that is slidably connected to the first arc-shaped groove is provided on the inner side of the outer end of the first rotating handle.

8. The high-concentration adjustable pulverized coal distributor according to claim 1, characterized in that: The second adjusting plate assembly includes a second rotating shaft that passes through and is rotatably connected to the main pipe. The second rotating shaft is fitted with second blades that are in clearance fit with the inner walls on both sides of the main pipe. One end of the second rotating shaft is provided with a second rotating handle. The outer wall of the main pipe is provided with a second arc-shaped groove. The inner side of the outer end of the second rotating handle is provided with a second support rod that is slidably connected to the second arc-shaped groove.

9. The high-concentration adjustable pulverized coal distributor according to claim 1, characterized in that: The third adjusting plate assembly includes a third rotating shaft that passes through and is rotatably connected to the main pipe. Three third blades are spaced apart on the third rotating shaft. A third rotating handle is provided at one end of the third rotating shaft. A third arc-shaped groove is provided on the outer wall of the main pipe. A third support rod that is slidably connected to the third arc-shaped groove is provided on the inner side of the outer end of the third rotating handle.

10. The high-concentration adjustable pulverized coal distributor according to claim 1, characterized in that: The fourth adjusting plate assembly includes a fourth rotating shaft that passes through and is rotatably connected to the main pipe. The fourth rotating shaft is fitted with a fourth blade that is clearance-fitted with the inner walls on both sides of the main pipe. One end of the fourth rotating shaft is provided with a fourth rotating handle. The outer wall of the main pipe is provided with a fourth arc-shaped groove. The inner side of the outer end of the fourth rotating handle is provided with a fourth support rod that is slidably connected to the fourth arc-shaped groove.

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