An oxygen supply mechanism for a pulverized coal combustion device

Abstract

This invention provides an oxygen supply mechanism for a pulverized coal combustion device, comprising an oxygen-enriched channel, a central body, and a control component. One end of the oxygen-enriched channel is a nozzle extending through the pulverized coal channel, while the other end is located outside the pulverized coal channel and connected to an oxygen evaporation device. The nozzle includes a gradually expanding section that points outward along the axial direction of the nozzle, with its inner diameter gradually increasing. The central body is adjustable within the nozzle along its axial direction, forming an annular flow channel between the central body and the inner wall of the nozzle. One end of the control component is connected to the central body, and the other end extends to the outside of the pulverized coal channel. This oxygen supply mechanism allows for adjustment of the annular flow channel area by changing the position of the central body, enabling flexible control of the oxygen flow rate. This ensures optimal mixing of pulverized coal and oxygen under different load conditions and pulverized coal concentrations.

Description

Technical Field

[0001] This utility model relates to the field of boiler combustion equipment, and in particular to an oxygen supply mechanism for a pulverized coal combustion device. Background Technology

[0002] A pulverized coal burner is a device that enables pulverized coal to burn completely in a short time, generating a high-temperature vortex. In existing technologies, the main bottleneck for deep peak shaving and low-load operation of coal-fired power units stems from unstable combustion in the boiler. Under low-load conditions, the amount of pulverized coal input decreases, but to meet air supply requirements, the primary air volume cannot decrease linearly with the amount of pulverized coal, resulting in a pulverized coal concentration far below the optimal level. At this time, the combustion rate decreases, the ignition time of the pulverized coal is delayed, the furnace heat load decreases, the flue gas temperature decreases, and the combustion stability of the pulverized coal is significantly reduced, posing a risk of furnace flameout.

[0003] Therefore, it is necessary to provide an oxygen supply mechanism for pulverized coal combustion devices to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides an oxygen supply mechanism for a pulverized coal combustion device, which can supply oxygen into the pulverized coal channel to achieve oxygen-enriched combustion. It can increase the oxygen concentration in the combustion zone, improve the ignition characteristics of the pulverized coal airflow, reduce the ignition temperature of the pulverized coal airflow and shorten the ignition distance, and increase the pulverized coal combustion rate. Thus, the heat generated by the combustion of a small amount of pulverized coal can ignite most of the pulverized coal, thereby solving the problem of combustion instability under low load conditions in existing combustion equipment.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: an oxygen supply mechanism for a pulverized coal combustion device, which is connected through the pulverized coal channel to supply oxygen into the pulverized coal channel. The oxygen supply mechanism for the pulverized coal combustion device includes: an oxygen-enriched channel, a central body, and a control component.

[0006] One end of the oxygen-enriched channel is a nozzle extending through the pulverized coal channel, and the other end of the oxygen-enriched channel is located outside the pulverized coal channel and connected to an oxygen evaporation device. The nozzle includes a gradually expanding section that extends outward along the axial direction of the nozzle. The inner diameter of the gradually expanding section gradually increases. The central body is adjustablely disposed inside the nozzle along the axial direction of the nozzle. An annular flow channel is formed between the central body and the inner wall of the nozzle. One end of the control component is connected to the central body, and the other end of the control component extends to the outside of the pulverized coal channel.

[0007] In this invention, the central body is a double cone structure, the outer diameter of the central body gradually decreases from the middle to both ends, and the axial direction of the central body is consistent with the axial direction of the nozzle.

[0008] Wherein, the maximum outer diameter of the central body is 1 / 5 to 1 / 2 of the maximum inner diameter of the expanding section, and the axial length of the central body is 3 / 8 to 5 / 8 of the length of the expanding section.

[0009] In this invention, the expansion angle of the gradually expanding section is 6° to 15°, and the length of the gradually expanding section is 2 to 5 times the inner diameter of the oxygen-enriched channel 12.

[0010] In this invention, the inner diameter of the oxygen-enriched channel is 1 / 12 to 1 / 6 of the width of the pulverized coal channel.

[0011] In this invention, the oxygen-enriched channel is equipped with a flow valve for controlling the oxygen delivery concentration.

[0012] Furthermore, the flow valve is an electrically adjustable valve, and a sensor is installed in the pulverized coal channel. The flow valve adjusts the oxygen delivery concentration according to the load signal of the sensor, and the adjustment range of the oxygen delivery concentration of the flow valve is 21% to 35%.

[0013] In this invention, the control component includes a turntable, a rotating shaft, a connecting frame, and a slider;

[0014] The rotating shaft rotates through the pulverized coal channel. The turntable is fixedly connected to one end of the inner side of the rotating shaft. One end of the connecting frame is slidably connected to the inner wall of the pulverized coal channel. The sliding direction of the connecting frame is consistent with the axial direction of the nozzle. The other end of the connecting frame is connected to the central body. The slider is slidably disposed on the connecting frame. The sliding direction of the slider intersects with the sliding direction of the connecting frame. The slider is provided with a connecting groove. One side of the turntable is provided with a connecting post for connecting with the connecting groove.

[0015] Furthermore, the connecting frame includes a frame rod, a connecting rod, and a sliding joint;

[0016] The frame rod has a bent structure. Two ends of the frame rods are connected to the two sides of the central body, and the connecting rod is connected between the other ends of the two frame rods. The slider is slidably connected to the connecting rod, and the sliding joint is fixedly connected to the frame rod.

[0017] In this invention, the control component includes a rocker arm, a connecting rod, and a telescopic rod;

[0018] The telescopic rod is an elastic telescopic structure. The central body is slidably connected to the inner wall of the nozzle on at least two sides through the telescopic rod. The rocker arm passes through the pulverized coal channel and is rotatably connected to the pulverized coal channel. The rotation axis of the rocker arm is perpendicular to the axial direction of the nozzle. The two ends of the connecting rod are rotatably connected to the telescopic rod and the rocker arm, respectively.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows: the oxygen supply mechanism of this utility model can be used to supplement oxygen into the pulverized coal channel, which can improve the ignition characteristics of the pulverized coal airflow in the pulverized coal channel, reduce the ignition temperature of the pulverized coal airflow and shorten the ignition distance, and increase the pulverized coal combustion rate, thereby igniting most of the pulverized coal through the heat generated by the combustion of a small amount of pulverized coal.

[0020] In addition, the size of the annular flow channel can be adjusted by changing the position of the central body, which can flexibly control the oxygen flow rate, so that the coal powder and oxygen flow can achieve the best mixing effect for different load conditions and different coal powder concentrations. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of this utility model.

[0022] Figure 1 This is a schematic diagram of the structure of the oxygen supply mechanism of the pulverized coal combustion device of this utility model, which is set on the pulverized coal channel.

[0023] Figure 2 This is a front view of the first embodiment of the control component in this utility model.

[0024] Figure 3 This is a schematic diagram of the first embodiment of the control component in this utility model.

[0025] Figure 4 This is a front view of the second embodiment of the control component in this utility model.

[0026] Figure 5 This is a top view of the second embodiment of the control component in this utility model. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this utility model, and are not intended to limit this utility model.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, a connection can be a detachable connection or a connection of an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be 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.

[0030] The problem of low combustion stability in existing combustion equipment under low load conditions.

[0031] The following is a preferred embodiment of an oxygen supply mechanism for a pulverized coal combustion device that can solve the above-mentioned technical problems.

[0032] Please refer to Figure 1 , Figure 2 and Figure 4 In the diagram, structurally similar units are represented by the same labels.

[0033] This embodiment provides an oxygen supply mechanism for a pulverized coal combustion device, which is connected through a pulverized coal channel 11 to supply oxygen into the pulverized coal channel 11. One end of the pulverized coal channel 11 is an inlet 111 for inputting pulverized coal gas flow, and the other end of the pulverized coal channel 11 is provided with a pulverized coal nozzle 112.

[0034] The oxygen supply mechanism for the pulverized coal combustion device in this embodiment includes: an oxygen-enriched channel 12, a central body 13, and a control component 14.

[0035] One end of the oxygen-enriched channel 12 is a nozzle 121 that extends through the pulverized coal channel 11, and the other end of the oxygen-enriched channel 12 is located outside the pulverized coal channel 11 and is connected to the oxygen evaporation device.

[0036] The nozzle 121 includes a gradually expanding section. Along the axial direction of the nozzle 121 and pointing outward, the inner diameter of the gradually expanding section gradually increases. The gradually expanding structure of the nozzle 121 can buffer the oxygen flow rate, prevent the oxygen flow rate from being too high and blowing away the coal powder, and fully ensure the mixing effect of coal powder and oxygen flow.

[0037] The central body 13 is adjustablely disposed inside the nozzle 121 along the axial direction of the nozzle 121. An annular flow channel is formed between the central body 13 and the inner wall of the nozzle 121. One end of the control component 14 is connected to the central body 13, and the other end of the control component 14 extends to the outside of the pulverized coal channel 11.

[0038] Operators can operate the control component 14 from outside the pulverized coal channel 11. By operating the control component 14, the position of the central body 13 can be changed to adjust the area of ​​the annular flow channel, allowing for flexible control of the oxygen flow rate. In this way, for different load conditions and different pulverized coal concentrations, the position of the central body 13 can be adjusted to achieve the best mixing effect between pulverized coal and oxygen flow.

[0039] Specifically, in this embodiment, the orientation of the nozzle 121 is consistent with the axial direction of the pulverized coal channel 11, and the nozzle 121 faces the pulverized coal nozzle 112.

[0040] Please refer to Figure 2 In this embodiment, the central body 13 has a double-cone structure, and the outer diameter of the central body 13 gradually decreases from the middle to both ends. The axial direction of the central body 13 is consistent with the axial direction of the nozzle 121, so that the oxygen gas flow can flow more smoothly through the central body 13.

[0041] In this embodiment, the maximum outer diameter of the central body 13 is 1 / 5 to 1 / 2 of the maximum inner diameter of the expanding section, and the axial length of the central body 13 is 3 / 8 to 5 / 8 of the length of the expanding section.

[0042] In this embodiment, the expansion angle of the gradually expanding section is 6° to 15°, and the length of the gradually expanding section is 2 to 5 times the inner diameter of the oxygen-enriched channel 12.

[0043] In this embodiment, the inner diameter of the oxygen-enriched channel 12 is 1 / 12 to 1 / 6 of the width of the pulverized coal channel 11, and the width of the pulverized coal channel 11 is... Figure 1 The vertical dimension of the viewing angle.

[0044] In this embodiment, a flow valve 15 for controlling the oxygen delivery concentration is provided in the oxygen-enriched channel 12.

[0045] More specifically, the flow valve 15 is an electric regulating valve, and a sensor is installed in the pulverized coal channel 11. The flow valve 15 adjusts the oxygen delivery concentration according to the load signal of the sensor. The adjustment range of the oxygen delivery concentration of the flow valve 15 is 21% to 35%.

[0046] The flow valve 15 can automatically adjust the oxygen flow supply according to load changes and form a good mixture with the coal powder airflow in the coal powder channel 11, so as to achieve precise control of coal powder combustion intensity.

[0047] The control component 14 in this embodiment can have various structures, but its main purpose is to drive the central body 13 to move along the axial direction of the nozzle 121.

[0048] Please refer to Figure 2 and Figure 3The control component 14 of the first embodiment will be described below. The control component 14 includes a turntable 141, a rotating shaft 142, a connecting frame 144, and a slider 145.

[0049] The rotating shaft 142 rotates through the pulverized coal channel 11, and the connection between the rotating shaft 142 and the pulverized coal channel 11 has a good sealing effect. The turntable 141 is fixedly connected to one end of the inner side of the rotating shaft 142, and the outer end of the rotating shaft 142 can be connected to a rotating handle 143 so that the operator can control the rotation of the turntable 141 from the outside.

[0050] One end of the connecting frame 144 is slidably connected to the inner wall of the pulverized coal channel 11, and the sliding direction of the connecting frame 144 is consistent with the axial direction of the nozzle 121. The other end of the connecting frame 144 is connected to the central body 13. The slider 145 is slidably mounted on the connecting frame 144, and the sliding direction of the slider 145 intersects with the sliding direction of the connecting frame 144. A connecting groove 1451 is provided on the slider 145, and a connecting post 1411 for connecting with the connecting groove 1451 is provided on one side of the turntable 141.

[0051] The connecting groove 1451 can be a spherical groove, and the connecting column 1411 can be provided with a spherical part that can form a universal rotatable connection with the spherical groove.

[0052] Please refer to Figure 3 Furthermore, the connecting frame 144 includes a frame rod 1441, a connecting rod 1442, and a sliding joint 1443.

[0053] The frame rod 1441 has a bent structure. Two ends of the frame rod 1441 are connected to both sides of the central body 13, and a connecting rod 1442 connects the other ends of the two frame rods 1441. The slider 145 is slidably connected to the connecting rod 1442. The sliding member 1443 is fixedly connected to the frame rod 1441, specifically at the connection point between the frame rod 1441 and the connecting rod 1442, ensuring a stable structure. The sliding member 1443 is used for sliding connection with the inner wall of the pulverized coal channel 11. The sliding member 1443 can be a chute or a rail structure, and a corresponding mating structure is provided on the inner wall of the pulverized coal channel 11.

[0054] The operator controls the turntable 141 to rotate from the outside. The turntable 141 can drive the connecting frame 144 to slide through the connecting column 1411, thereby changing the position of the central body 13.

[0055] Please refer to Figure 4 and Figure 5 The control component 14 of the second embodiment will be described below. The control component 14 includes a rocker arm 21, a connecting rod 22, and a telescopic rod 23.

[0056] The telescopic rod 23 is an elastic telescopic structure, and the central body 13 is slidably connected to the inner wall of the nozzle 121 on at least two sides through the telescopic rod 23. The telescopic rod 23 can adapt to changes in the inner diameter of the nozzle 121 through elastic expansion and contraction.

[0057] The rocker arm 21 passes through the pulverized coal channel 11 and is rotatably connected to the pulverized coal channel 11. The rotation axis of the rocker arm 21 is perpendicular to the axial direction of the nozzle 121. The two ends of the connecting rod 22 are rotatably connected to the telescopic rod 23 and the rocker arm 21, respectively.

[0058] Specifically, the telescopic rod 23 may include a fixed rod 231, a sleeve rod 232, and a spring 233. One end of the fixed rod 231 is fixedly connected to the central body 13, and the other end of the fixed rod 231 is slidably sleeved inside the sleeve rod 232. The spring 233 is compressed and disposed inside the sleeve rod 232 and contacts the fixed rod 231. The connecting rod 22 has a U-shaped structure, with its two ends rotatably connected to the two fixed rods 231 respectively, and its middle part rotatably connected to the rocker arm 21.

[0059] The operator controls the rocker arm 21 from the outside, and the rocker arm 21 can drive the central body 13 to move and change position through the connecting rod 22.

[0060] When the oxygen supply mechanism of this utility model for a pulverized coal combustion device is used, the area of ​​the annular flow channel increases when the central body 13 is driven to move to the outer end of the nozzle 121 by the operation control component 14, and the oxygen flow rate output from the nozzle 121 decreases. When the central body 13 is driven to move to the inner end of the nozzle 121, the area of ​​the annular flow channel decreases, and the oxygen flow rate output from the nozzle 121 increases.

[0061] The oxygen supply mechanism of the pulverized coal combustion device in this embodiment can be used to supplement oxygen into the pulverized coal channel, which can improve the ignition characteristics of the pulverized coal airflow in the pulverized coal channel, reduce the ignition temperature of the pulverized coal airflow and shorten the ignition distance, and increase the pulverized coal combustion rate, thereby igniting most of the pulverized coal with the heat generated by the combustion of a small amount of pulverized coal.

[0062] In addition, the size of the annular flow channel can be adjusted by changing the position of the central body, which can flexibly control the oxygen flow rate, so that the coal powder and oxygen flow can achieve the best mixing effect for different load conditions and different coal powder concentrations.

[0063] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. An oxygen supply mechanism for a pulverized coal combustion device, characterized in that, It is connected through the pulverized coal channel (11) to supply oxygen into the pulverized coal channel (11). The oxygen supply mechanism for the pulverized coal combustion device includes: an oxygen-enriched channel (12), a central body (13), and a control component (14). One end of the oxygen-enriched channel (12) is a nozzle (121) extending through the pulverized coal channel (11). The other end of the oxygen-enriched channel (12) is located outside the pulverized coal channel (11) and is connected to an oxygen evaporation device. The nozzle (121) includes a gradually expanding section along the axial direction of the nozzle (121) and pointing outward. The inner diameter of the gradually expanding section gradually increases. The central body (13) is adjustablely disposed inside the nozzle (121) along the axial direction of the nozzle (121). An annular flow channel is formed between the central body (13) and the inner wall of the nozzle (121). One end of the control component (14) is connected to the central body (13), and the other end of the control component (14) extends to the outside of the pulverized coal channel (11).

2. The oxygen supply mechanism for a pulverized coal combustion device according to claim 1, characterized in that, The central body (13) has a double cone structure. The outer diameter of the central body (13) gradually decreases from the middle to both ends. The axial direction of the central body (13) is consistent with the axial direction of the nozzle (121).

3. The oxygen supply mechanism for a pulverized coal combustion device according to claim 2, characterized in that, The maximum outer diameter of the central body (13) is 1 / 5 to 1 / 2 of the maximum inner diameter of the expanding section, and the axial length of the central body (13) is 3 / 8 to 5 / 8 of the length of the expanding section.

4. The oxygen supply mechanism for a pulverized coal combustion device according to claim 1, characterized in that, The expansion angle of the gradually expanding section is 6° to 15°, and the length of the gradually expanding section is 2 to 5 times the inner diameter of the oxygen-enriched channel (12).

5. The oxygen supply mechanism for a pulverized coal combustion device according to claim 1, characterized in that, The inner diameter of the oxygen-enriched channel (12) is 1 / 12 to 1 / 6 of the width of the pulverized coal channel (11).

6. The oxygen supply mechanism for a pulverized coal combustion device according to claim 1, characterized in that, The oxygen-enriched channel (12) is equipped with a flow valve (15) for controlling the oxygen delivery concentration.

7. The oxygen supply mechanism for a pulverized coal combustion device according to claim 6, characterized in that, The flow valve (15) is an electric regulating valve. A sensor is installed in the pulverized coal channel (11). The flow valve (15) adjusts the oxygen delivery concentration according to the load signal of the sensor. The adjustment range of the oxygen delivery concentration of the flow valve (15) is 21% to 35%.

8. The oxygen supply mechanism for a pulverized coal combustion device according to claim 1, characterized in that, The control component (14) includes a turntable (141), a rotating shaft (142), a connecting frame (144), and a slider (145); The rotating shaft (142) rotates through the pulverized coal channel (11). The turntable (141) is fixedly connected to one end of the inner side of the rotating shaft (142). One end of the connecting frame (144) is slidably connected to the inner wall of the pulverized coal channel (11). The sliding direction of the connecting frame (144) is consistent with the axial direction of the nozzle (121). The other end of the connecting frame (144) is connected to the central body (13). The slider (145) is slidably disposed on the connecting frame (144). The sliding direction of the slider (145) intersects with the sliding direction of the connecting frame (144). A connecting groove (1451) is provided on the slider (145). A connecting post (1411) for connecting with the connecting groove (1451) is provided on one side of the turntable (141).

9. The oxygen supply mechanism for a pulverized coal combustion device according to claim 8, characterized in that, The connecting frame (144) includes a frame rod (1441), a connecting rod (1442), and a sliding joint (1443); The frame rod (1441) has a bent structure. The two sides of the central body (13) are respectively connected to one end of the two frame rods (1441). The other ends of the two frame rods (1441) are connected to the connecting rod (1442). The slider (145) is slidably connected to the connecting rod (1442). The sliding joint (1443) is fixedly connected to the frame rod (1441).

10. The oxygen supply mechanism for a pulverized coal combustion device according to claim 1, characterized in that, The control component (14) includes a rocker arm (21), a connecting rod (22), and a telescopic rod (23); The telescopic rod (23) is an elastic telescopic structure. The central body (13) is slidably connected to the inner wall of the nozzle (121) on at least two sides through the telescopic rod (23). The rocker arm (21) passes through the pulverized coal channel (11) and is rotatably connected to the pulverized coal channel (11). The rotation axis of the rocker arm (21) is perpendicular to the axial direction of the nozzle (121). The two ends of the connecting rod (22) are rotatably connected to the telescopic rod (23) and the rocker arm (21) respectively.

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