Pulverized coal combustion stabilizer and operation method

Abstract

The pulverized coal combustion stabilizer comprises a body, a pulverized coal pipe and a coal outlet piece, one end of the body is provided with a cavity, one end of the pulverized coal pipe extends into the cavity, the pulverized coal pipe is provided with a first flow channel and a second flow channel, the first flow channel is sleeved with the second flow channel, and the first flow channel and the second flow channel both communicate with the cavity; pulverized coal can be introduced into the chamber through the first flow channel and the second flow channel, the coal outlet piece is arranged at one end of the pulverized coal pipe and is provided with a first channel, a second channel and a coal outlet, one end of the first channel is communicated with the first flow channel, and one end of the second channel is communicated with the second flow channel; the other end of the first channel and the other end of the second channel are both communicated with the coal outlet, an included angle a is formed between the flowing direction of the pulverized coal flowing out of the first channel and the flowing direction of the pulverized coal flowing out of the second channel, and the included angle a can be adjusted. The pulverized coal combustion stabilizer is suitable for different coal types, high in adaptability and stable in combustion.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion stabilizers, and in particular to a pulverized coal combustion stabilizer and an operating method thereof. Background Art

[0002] Deep peak load regulation of coal-fired power units is an important measure to promote the construction of a new energy system. In this context, it is urgent to develop low-load stable combustion technology with good operation economy and reliability. Compared with the commonly used ignition and stable combustion technologies such as plasma ignition and oil injection, the idea of ​​using a small amount of coal powder to burn first to ignite and stabilize the main coal powder airflow (referred to as "coal-to-coal" technology) is considered to have obvious advantages in terms of economy and reliability.

[0003] Among the related technologies, the reverse injection combustion technology is adapted to the technical idea of ​​"coal igniting coal", that is, to build a high-temperature recirculation zone inside the combustion chamber to enhance the rapid heating and ignition of coal powder and stable combustion. However, when using different types of coal, the reverse injection combustion technology is prone to fluctuations in the operation of the stabilizer due to the different characteristics of different fuels, and the reliability is low. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a pulverized coal combustion stabilizer and an operating method.

[0006] The pulverized coal combustion stabilizer of the embodiment of the present invention comprises:

[0007] A body, one end of the body having a chamber, and the chamber having a reflow zone;

[0008] A pulverized coal pipe, one end of which extends into the chamber, the pulverized coal pipe having a first flow channel and a second flow channel, the second flow channel being sleeved outside the first flow channel, the first flow channel and the second flow channel both being in communication with the chamber, and pulverized coal can be introduced into the chamber through the first flow channel and the second flow channel;

[0009] a coal outlet, the coal outlet being arranged at one end of the pulverized coal pipe, the coal outlet having a first channel, a second channel and a coal outlet, one end of the first channel being communicated with the first flow channel, one end of the second channel being communicated with the second flow channel, the other end of the first channel and the other end of the second channel being communicated with the coal outlet, the coal outlet being located in the recirculation zone and being opened toward the other end of the pulverized coal pipe, the pulverized coal in the first flow channel and the pulverized coal in the second flow channel flowing into the recirculation zone through the coal outlet,

[0010] There is an angle a between the flow direction of the coal powder flowing out through the first channel and the flow direction of the coal powder flowing out through the second channel. The flow direction of the coal powder flowing out of the first channel and the flow direction of the coal powder flowing out of the second channel are changed by adjusting the amount of coal powder in the first channel and the amount of coal powder in the second channel, so that the size of the angle a can be adjusted.

[0011] The pulverized coal combustion stabilizer of the embodiment of the present invention can store pulverized coal of different types separately by setting the first flow channel and the second flow channel. The pulverized coal in the first channel and the pulverized coal in the second channel meet near the coal outlet, and then converge into a stream of pulverized coal and jet out from the coal outlet. In this process, the jet momentum ratio of the two pulverized coal airflows at the coal outlet can be adjusted by adjusting the amount of pulverized coal in the first flow channel and the amount of pulverized coal in the second flow channel, so as to change the mutual induced effect between the two pulverized coal jets, so that the size of the angle a between the two pulverized coal jets can be adjusted.

[0012] When the angle a increases, the radial velocity component of the coal powder jet at the coal outlet flowing around increases, and the axial velocity component decreases, so that the overall velocity attenuation of the coal powder jet from one end of the coal powder pipe to the other end of the coal powder pipe is accelerated, and after turning early, it flows from the other end of the coal powder pipe to one end of the coal powder pipe, thereby achieving the purpose of reducing the axial length of the recirculation zone in the chamber. When the angle a decreases, the radial velocity component of the coal powder jet at the coal outlet flowing around decreases, and the axial velocity component increases, so that the overall velocity attenuation of the coal powder jet from one end of the coal powder pipe to the other end of the coal powder pipe is slowed down, and after delaying the turning, it flows from the other end of the coal powder pipe to one end of the coal powder pipe, thereby achieving the purpose of increasing the axial length of the recirculation zone in the chamber, thereby flexibly constructing the recirculation zone distribution suitable for stable combustion of different types of coal, improving the coal type adaptability of the coal powder burner and the stability of the coal powder burner during operation.

[0013] In some embodiments, the angle a has a value range of: 0≤a<90°.

[0014] In some embodiments, the pulverized coal pipe comprises:

[0015] a first pulverized coal pipe, one end of which extends into the chamber, and the first flow channel is formed in the first pulverized coal pipe;

[0016] A second pulverized coal pipe, wherein the second pulverized coal pipe is sleeved outside the first pulverized coal pipe, one end of the second pulverized coal pipe extends into the chamber, one end of the first pulverized coal pipe extends out of one end of the second pulverized coal pipe, and the second flow channel is formed between the inner circumference of the second pulverized coal pipe and the outer circumference of the first pulverized coal pipe.

[0017] In some embodiments, a central axis of the first flow channel is collinear with a central axis of the second flow channel.

[0018] In some embodiments, the coal outlet comprises:

[0019] a protrusion, one end of which is disposed at one end of the second pulverized coal pipe and is disposed around the circumference of the second pulverized coal pipe, and the other end of which extends along a first direction toward a direction away from the second pulverized coal pipe;

[0020] A first guide portion and an extension portion, wherein one end of the first guide portion is disposed at one end of the first pulverized coal pipe and is disposed around the circumference of the first pulverized coal pipe, the other end of the first guide portion extends outward along the circumference of the first pulverized coal pipe, the other end of the first guide portion is located outside the protruding portion, one end of the extension portion is disposed around the other end of the first guide portion, the other end of the extension portion extends toward the protruding portion along the first direction, the extension portion is located outside the protruding portion, and the second channel is formed between the outer circumferential surface of the protruding portion and the inner circumferential surfaces of the first guide portion and the extension portion;

[0021] A second guide portion, one end of the second guide portion is connected to the outer circumferential surface of the second coal powder pipe, the coal outlet is formed at one end of the second guide portion and is opened along the first direction, the second guide portion has an inner cavity, the protrusion, the first guide portion and the extension portion are located in the inner cavity, and the first channel is formed between the outer circumferential surfaces of the first guide portion and the extension portion and the inner circumferential surface of the second guide portion.

[0022] In some embodiments, the outer peripheral surface of the protrusion is an inclined surface extending along the first direction and gradually moving away from the second pulverized coal pipe from the other end of the protrusion to one end of the protrusion.

[0023] In some embodiments, the inner circumferential surface of the extension portion is a slope and is adapted to the outer circumferential surface of the protrusion so that the angle a is formed between the central axis of one end of the second channel adjacent to the coal outlet and the central axis of the coal outlet, and the central axis of one end of the first channel adjacent to the coal outlet is parallel to the central axis of the coal outlet.

[0024] In some embodiments, a central axis of the protrusion, a central axis of the first guide portion, and a central axis of the second guide portion are collinear.

[0025] In some embodiments, the pulverized coal combustion stabilizer also includes a branch pipe, which is arranged at the other end of the second pulverized coal pipe, the central axis of the branch pipe is orthogonal to the central axis of the second pulverized coal pipe, and the other end of the first pulverized coal pipe extends out of the other end of the second pulverized coal pipe.

[0026] The operating method of the pulverized coal combustion stabilizer according to the embodiment of the present invention comprises:

[0027] Introducing pulverized coal into the first pulverized coal pipe, so that the pulverized coal in the first pulverized coal pipe flows into the first channel and flows out from the coal outlet;

[0028] Introducing pulverized coal into the second pulverized coal pipe, so that the pulverized coal in the second pulverized coal pipe flows into the second channel and flows out from the coal outlet;

[0029] The size of the angle a can be adjusted by adjusting the amount of pulverized coal introduced into the first pulverized coal pipe and the amount of pulverized coal introduced into the second pulverized coal pipe.

[0030] The operating method of the pulverized coal combustion stabilizer of the embodiment of the present invention is as follows: when the angle a increases, the radial velocity component of the pulverized coal jet at the coal outlet flowing around increases, and the axial velocity component decreases, so that the velocity attenuation of the pulverized coal jet as a whole from one end of the pulverized coal pipe to the other end of the pulverized coal pipe is accelerated, and after turning early, it flows from the other end of the pulverized coal pipe to one end of the pulverized coal pipe, thereby achieving the purpose of reducing the axial length of the recirculation zone in the chamber; when the angle a decreases, the radial velocity component of the pulverized coal jet at the coal outlet flowing around decreases, and at the same time the axial velocity component increases, so that the velocity attenuation of the pulverized coal jet as a whole from one end of the pulverized coal pipe to the other end of the pulverized coal pipe is slowed down, and after turning later, it flows from the other end of the pulverized coal pipe to one end of the pulverized coal pipe, thereby achieving the purpose of increasing the axial length of the recirculation zone in the chamber, thereby flexibly constructing the recirculation zone distribution suitable for stable combustion of different types of coal, improving the coal type adaptability of the pulverized coal combustion stabilizer, and the operation process is simple and the adjustment efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional view of a pulverized coal combustion stabilizer according to an embodiment of the present invention.

[0032] Figure 2 It is a schematic diagram of a coal outlet of a pulverized coal combustion stabilizer according to an embodiment of the present invention.

[0033] Figure numerals: 1. main body; 11. chamber; 111. recirculation zone; 2. pulverized coal pipe; 21. first pulverized coal pipe; 211. first flow channel; 22. second pulverized coal pipe; 221. second flow channel; 3. coal outlet; 31. protrusion; 32. first guide portion; 33. extension portion; 34. second guide portion; 341. inner cavity; 35. first channel; 36. second channel; 37. coal outlet; 4. branch pipe. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0035] like Figure 1-2As shown, the pulverized coal combustion stabilizer of the embodiment of the present invention comprises a body 1, a pulverized coal pipe 2 and a coal outlet 3. The body 1 extends along a first direction (eg Figure 1 left and right directions) (as shown) Figure 1 The right end of the body 1 shown in FIG. 1 has a chamber 11, and the chamber 11 has a reflow zone 111, as shown in FIG. Figure 1 As shown, the length of the recirculation zone 111 is L. One end of the pulverized coal pipe 2 (such as Figure 1 The right end of the pulverized coal pipe 2 as shown in the figure extends into the chamber 11. The pulverized coal pipe 2 has a first flow channel 211 and a second flow channel 221, the second flow channel 221 is sleeved outside the first flow channel 211, and the first flow channel 211 and the second flow channel 221 are both connected to the chamber 11, and the pulverized coal can be introduced into the chamber 11 through the first flow channel 211 and the second flow channel 221.

[0036] The coal outlet 3 is arranged at the right end of the pulverized coal pipe 2. The coal outlet 3 has a first channel 35, a second channel 36 and a coal outlet 37. One end of the first channel 35 is connected to the first flow channel 211, one end of the second channel 36 is connected to the second flow channel 221, and the other end of the first channel 35 and the other end of the second channel 36 are both connected to the coal outlet 37. The coal outlet 37 is located in the reflux area 111 and faces the other end of the pulverized coal pipe 2 (such as Figure 1 Specifically, the central axis of the coal outlet 37 extends along the first direction, and the coal powder in the first flow channel 211 and the coal powder in the second flow channel 221 flow into the recirculation zone 111 through the coal outlet 37 to burn in the recirculation zone 111, and the temperature in the recirculation zone 111 increases. Specifically, the flow area of ​​the outlet of the second channel 36 is equal to the flow area of ​​the outlet of the first channel 35.

[0037] There is an angle a between the flow direction of the coal powder flowing out through the first channel 35 and the flow direction of the coal powder flowing out through the second channel 36. By adjusting the amount of coal powder in the first flow channel 211 and the amount of coal powder in the second flow channel 221, the flow direction of the coal powder flowing out of the first channel 35 and the flow direction of the coal powder flowing out of the second channel 36 can be changed, so that the size of the angle a can be adjusted.

[0038] The coal powder combustion stabilizer of the embodiment of the present invention can store coal powder of different types separately by setting the first flow channel 211 and the second flow channel 221. There is an angle a between the flow direction of the coal powder flowing out of the second channel 36 and the flow direction of the coal powder flowing out of the first channel 35. Under the joint action of the second channel 36 and the first channel 35, the coal powder airflows flowing through them will meet near the outlets of the second channel 36 and the first channel 35, and then converge into an annular coal powder jet and then spray out at high speed. In this process, the jet momentum ratio of the two coal powder airflows can be changed by adjusting the coal powder airflow flow in the first flow channel 211 and the second flow channel 221 respectively, thereby changing the coal powder airflow momentum ratio flowing out of the second channel 36 and the first channel 35 respectively. According to the Bernoulli principle, the mutual induced effect between the two coal powder jets can be changed, and finally the overall coal powder jet expansion angle formed after the two coal powder jets converge can be flexibly adjusted between 0° and a°.

[0039] It can be understood that, when the total amount of pulverized coal is fixed, the pulverized coal flow rate in the second channel 36 is increased, and the pulverized coal flow rate in the first channel 35 is reduced, the overall pulverized coal jet expansion angle formed after convergence gradually approaches a°. When the total amount of pulverized coal is fixed, the pulverized coal flow rate in the second channel 36 is reduced, and the pulverized coal flow rate in the first channel 35 is increased, the overall pulverized coal jet expansion angle formed after convergence gradually approaches 0°.

[0040] When the overall coal powder jet expansion angle increases, the radial velocity component of the coal powder jet flowing around will increase, while the axial velocity component will decrease, so that the overall flow velocity attenuation of the coal powder jet from right to left will be accelerated, and after turning early, it will flow from left to right, thereby achieving the purpose of reducing the axial length of the high-temperature recirculation zone 111. When the overall coal powder jet expansion angle decreases, the radial velocity component of the coal powder jet flowing around will decrease, while the axial velocity component will increase, so that the overall flow velocity attenuation of the coal powder jet from right to left will be slowed down, and after turning later, it will flow from left to right, thereby achieving the purpose of increasing the axial length of the high-temperature recirculation zone 111, thereby flexibly constructing the distribution of the recirculation zone 111 suitable for stable combustion of different types of coal, improving the coal type adaptability of the coal powder burner stabilizer and the stability of the coal powder burner stabilizer during operation.

[0041] In some embodiments, the value range of the angle a is: 0≤a<90°.

[0042] Specifically, when there is no coal powder discharged from the coal outlet 37 in the second flow channel 221 and there is coal powder discharged from the coal outlet 37 in the first flow channel 211, the coal powder is ejected along the first direction, and the angle a is 0. When there is coal powder discharged from the coal outlet 37 in the second flow channel 221 and there is no coal powder discharged from the coal outlet 37 in the first flow channel 211, the coal powder is ejected along the central axis direction of the outlet of the second channel 36, and the angle 0<a<90°.

[0043] In some embodiments, the pulverized coal pipe 2 includes a first pulverized coal pipe 21 and a second pulverized coal pipe 22. One end of the first pulverized coal pipe 21 (eg Figure 1 The first pulverized coal pipe 21 (shown as the right end of the first pulverized coal pipe 21) extends into the chamber 11, and the first flow channel 211 is formed in the first pulverized coal pipe 21. The second pulverized coal pipe 22 is sleeved outside the first pulverized coal pipe 21, and one end of the second pulverized coal pipe 22 (as shown in FIG. Figure 1 The right end of the second pulverized coal pipe 22 as shown extends into the chamber 11, the right end of the first pulverized coal pipe 21 extends out of the right end of the second pulverized coal pipe 22, and the second flow channel 221 is formed between the inner circumference of the second pulverized coal pipe 22 and the outer circumference of the first pulverized coal pipe 21.

[0044] Specifically, the first pulverized coal pipe 21 and the second pulverized coal pipe 22 are both slender straight pipe structures, the inner diameter of the second pulverized coal pipe 22 is larger than the outer diameter of the first pulverized coal pipe 21, and the first pulverized coal pipe 21 and the second pulverized coal pipe 22 are coaxially arranged so that the second flow channel 221 formed between the inner circumference of the second pulverized coal pipe 22 and the outer circumference of the first pulverized coal pipe 21 is an annular flow channel. Through the above arrangement, the structure of the pulverized coal pipe 2 is simple, saving manufacturing costs.

[0045] In some embodiments, the central axis of the first flow channel 211 is colinear with the central axis of the second flow channel 221, so that the coal powder is in a ring shape when flowing out of the second flow channel 221, ensuring the uniformity of the coal powder when flowing in the second flow channel 221 and improving the flow efficiency of the coal powder in the second flow channel 221.

[0046] In some embodiments, the pulverized coal combustion stabilizer further includes a branch pipe 4, which is arranged at the other end of the second pulverized coal pipe 22 (such as Figure 1 The central axis of the branch pipe 4 is orthogonal to the central axis of the second pulverized coal pipe 22, and the other end of the first pulverized coal pipe 21 (as shown in FIG. Figure 1 The left end of the first pulverized coal pipe 21 as shown extends out of the other end of the second pulverized coal pipe 22.

[0047] Specifically, the left end of the second pulverized coal pipe 22 is a closed end, and the left end of the first pulverized coal pipe 21 passes through the left end of the second pulverized coal pipe 22. The branch pipe 4 is a short circular pipe, and valves (not shown) are provided at the upper end of the branch pipe 4 and the left end of the first pulverized coal pipe 21. By adjusting the opening of the valves provided at the upper end of the first pulverized coal pipe 21 and the branch pipe 4, respectively, the flow rate of the pulverized coal airflow flowing into the first pulverized coal pipe 21 and flowing into the second pulverized coal pipe 22 through the branch pipe 4 is adjusted, which is convenient for operation.

[0048] In some embodiments, the coal outlet 3 includes a protruding portion 31, a first guide portion 32, an extension portion 33, and a second guide portion 34. One end of the protruding portion 31 (eg Figure 2The left end of the protrusion 31 shown in the figure) is arranged at the right end of the second pulverized coal pipe 22 and is arranged around the circumference of the second pulverized coal pipe 22. The other end of the protrusion 31 (as shown in the figure) is arranged at the right end of the second pulverized coal pipe 22. Figure 2 The right end of the protrusion 31 shown in the figure extends along the first direction toward a direction away from the second pulverized coal pipe 22 and is located on the left side of the right end of the first pulverized coal pipe 21.

[0049] Specifically, the protrusion 31 is an axisymmetric structure with a central hole, and the inner diameter of the central hole of the protrusion 31 is the same as the inner diameter of the second pulverized coal pipe 22 .

[0050] One end of the first guide portion 32 is disposed at the right end of the first pulverized coal pipe 21 and is disposed around the circumference of the first pulverized coal pipe 21, and the other end of the first guide portion 32 extends outward along the circumference of the first pulverized coal pipe 21, and the other end of the first guide portion 32 is located outside the protruding portion 31. Specifically, the first guide portion 32 is an axisymmetric structure with a central hole, and the inner diameter of the central hole of the first guide portion 32 is the same as the inner diameter of the first pulverized coal pipe 21, and the first guide portion 32 is annular.

[0051] One end of the extension portion 33 (such as Figure 2 The right end of the extension portion 33 shown in FIG. 3 is arranged around the other end of the first guide portion 32, and the other end of the extension portion 33 (as shown in FIG. Figure 2 The left end of the extension portion 33 shown in the figure extends toward the protrusion 31 along the first direction, the extension portion 33 is located on the outside of the protrusion 31, the inner circumference of the extension portion 33 and the outer circumference of the protrusion 31 are arranged at intervals, and the second channel 36 is formed between the outer circumference of the protrusion 31 and the inner circumference of the first guide portion 32 and the extension portion 33.

[0052] Specifically, the second channel 36 can guide the coal powder airflow flowing through it to be ejected into a conical annular jet at high speed. The diameter of the conical coal powder jet gradually increases from right to left, and the flow direction of this part of the conical coal powder jet injected into the recirculation zone 111 is opposite to the flow direction of the coal powder airflow in the second flow channel 221.

[0053] One end of the second guide portion 34 (such as Figure 2 The left end of the second guide portion 34 shown in the figure is connected to the outer circumference of the second coal powder pipe 22, and the coal outlet 37 is formed at one end of the second guide portion 34 and is opened along the first direction. The second guide portion 34 has an inner cavity 341, the protrusion 31, the first guide portion 32 and the extension portion 33 are located in the inner cavity 341, and the first channel 35 is formed between the outer circumference of the first guide portion 32 and the extension portion 33 and the inner circumference of the second guide portion 34.

[0054] Specifically, the second guide portion 34 is a hat-shaped axisymmetric structure, and the second guide portion 34 is coaxially arranged with the first guide portion 32, and is covered at the right end of the first guide portion 32, so that the first channel 35 is formed between the inner circumference of the second guide portion 34 and the outer circumference of the first guide portion 32 and the extension portion 33. The first channel 35 can guide the coal powder airflow flowing through it to be ejected at high speed as an equal-diameter annular jet, and the flow direction of this part of the equal-diameter annular coal powder jet injected into the recirculation zone 111 is opposite to its flow direction in the first coal powder pipe 21.

[0055] Specifically, there are a plurality of coal outlets 37 , and the plurality of coal outlets 37 are arranged at intervals in the circumferential direction around the left end surface of the second guide portion 34 .

[0056] In some embodiments, the outer peripheral surface of the protrusion 31 is an inclined surface extending along the first direction and gradually moving away from the second pulverized coal pipe 22 from the right end of the protrusion 31 to the left end of the protrusion 31 .

[0057] Specifically, the outer contour of the protrusion 31 is truncated cone-shaped, and the cross-sectional area of ​​the outer contour of the protrusion 31 gradually increases from the right end to the left end of the protrusion 31, and the diameter of the outer contour of the left end of the protrusion 31 is greater than the outer diameter of the second pulverized coal pipe 22.

[0058] In some embodiments, the inner circumferential surface of the extension portion 33 is a slope and is adapted to the outer circumferential surface of the protrusion 31, so that an angle a is formed between the central axis of one end of the second channel 36 adjacent to the coal outlet 37 and the central axis of the coal outlet 37, and the central axis of one end of the first channel 35 adjacent to the coal outlet 37 is parallel to the central axis of the coal outlet 37.

[0059] Specifically, the outer circumferential contour of the extension portion 33 is cylindrical, and the inner circumferential contour of the extension portion 33 is truncated cone-shaped. The cross-section of the inner circumferential contour of the extension portion 33 gradually increases from the right end of the extension portion 33 to the left end of the extension portion 33, so that the inner circumferential surface of the extension portion 33 is adapted to the inclination degree of the outer circumferential surface of the protrusion 31, so that the flow direction of the pulverized coal airflow ejected through the second channel 36 can form an angle with the flow direction of the pulverized coal airflow ejected from the first channel 35.

[0060] In some embodiments, the central axis of the protrusion 31, the central axis of the first guide portion 32 and the central axis of the second guide portion 34 are collinear, ensuring that the annular pulverized coal jet ejected at high speed from the first channel 35 and the conical annular pulverized coal jet ejected at high speed from the second channel 36 are evenly distributed.

[0061] The operating method of the pulverized coal combustion stabilizer according to the embodiment of the present invention comprises:

[0062] Pulverized coal is introduced into the first pulverized coal pipe 21, and the pulverized coal in the first pulverized coal pipe 21 flows into the first channel 35 and flows out from the coal outlet 37. Pulverized coal is introduced into the second pulverized coal pipe 22, and the pulverized coal in the second pulverized coal pipe 22 flows into the second channel 36 and flows out from the coal outlet 37. The angle a can be adjusted by adjusting the amount of pulverized coal introduced into the first pulverized coal pipe 21 and the amount of pulverized coal introduced into the second pulverized coal pipe 22.

[0063] Specifically, the total amount of pulverized coal is fixed, when the pulverized coal airflow in the second channel 36 is increased and the pulverized coal airflow in the first channel 35 is reduced, the overall pulverized coal jet expansion angle formed after convergence gradually approaches a°. The total amount of pulverized coal is fixed, when the pulverized coal airflow in the second channel 36 is reduced and the pulverized coal airflow in the first channel 35 is increased, the overall pulverized coal jet expansion angle formed after convergence gradually approaches 0°.

[0064] The operation method of the pulverized coal combustion stabilizer of the embodiment of the present invention is that when the angle a increases, the radial velocity component of the pulverized coal jet at the coal outlet 37 flowing around increases, and the axial velocity component decreases, so that the flow velocity attenuation of the pulverized coal jet from one end of the pulverized coal pipe 2 to the other end of the pulverized coal pipe 2 is accelerated, and after turning early, it flows from the other end of the pulverized coal pipe 2 to one end of the pulverized coal pipe 2, thereby achieving the purpose of reducing the axial length of the recirculation zone 111 in the chamber 11. When the angle a decreases, the radial velocity component of the pulverized coal jet at the coal outlet 37 flowing around decreases, and the axial velocity component increases, so that the flow velocity attenuation of the pulverized coal jet from one end of the pulverized coal pipe 2 to the other end of the pulverized coal pipe 2 is slowed down, and after turning late, it flows from the other end of the pulverized coal pipe 2 to one end of the pulverized coal pipe 2, thereby achieving the purpose of increasing the axial length of the recirculation zone 111 in the chamber 11, thereby flexibly constructing the distribution of the recirculation zone 111 suitable for stable combustion of different types of coal, and improving the coal type adaptability of the pulverized coal combustion stabilizer.

[0065] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “right”, “left”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A pulverized coal combustion stabilizer, characterized in that: include: A body (1), one end of the body (1) having a chamber (11), the chamber (11) having a reflow zone (111); A pulverized coal pipe (2), one end of the pulverized coal pipe (2) extending into the chamber (11), the pulverized coal pipe (2) comprising a first flow channel (211) and a second flow channel (221), the second flow channel (221) being sleeved outside the first flow channel (211), the first flow channel (211) and the second flow channel (221) both being in communication with the chamber (11), and pulverized coal can be introduced into the chamber (11) through the first flow channel (211) and the second flow channel (221); A coal outlet (3), the coal outlet (3) being arranged at one end of the pulverized coal pipe (2), the coal outlet (3) comprising a first channel (35), a second channel (36) and a coal outlet (37), one end of the first channel (35) being in communication with the first flow channel (211), one end of the second channel (36) being in communication with the second flow channel (221), the other end of the first channel (35) and the other end of the second channel (36) both being in communication with the coal outlet (37), the coal outlet (37) being located in the recirculation zone (111) and being opened toward the other end of the pulverized coal pipe (2), the pulverized coal in the first flow channel (211) and the pulverized coal in the second flow channel (221) flowing into the recirculation zone (111) through the coal outlet (37), An angle a is formed between the flow direction of the coal powder flowing out through the first channel (35) and the flow direction of the coal powder flowing out through the second channel (36). The flow direction of the coal powder flowing out of the first channel (35) and the flow direction of the coal powder flowing out of the second channel (36) are changed by adjusting the amount of coal powder in the first channel (211) and the amount of coal powder in the second channel (221), so that the size of the angle a can be adjusted.

2. The pulverized coal combustion stabilizer according to claim 1, characterized in that: The value range of the angle a is: 0≤a<90°.

3. The pulverized coal combustion stabilizer according to claim 1, characterized in that: The pulverized coal pipe (2) comprises: a first pulverized coal pipe (21), one end of the first pulverized coal pipe (21) extending into the chamber (11), and the first flow channel (211) being formed in the first pulverized coal pipe (21); A second pulverized coal pipe (22), the second pulverized coal pipe (22) is sleeved outside the first pulverized coal pipe (21), one end of the second pulverized coal pipe (22) extends into the chamber (11), one end of the first pulverized coal pipe (21) extends out of one end of the second pulverized coal pipe (22), and the second flow channel (221) is formed between the inner circumference of the second pulverized coal pipe (22) and the outer circumference of the first pulverized coal pipe (21).

4. The pulverized coal combustion stabilizer according to claim 3, characterized in that: The central axis of the first flow channel (211) and the central axis of the second flow channel (221) are collinear.

5. The pulverized coal combustion stabilizer according to claim 3, characterized in that: The coal outlet member (3) comprises: a protrusion (31), one end of the protrusion (31) being arranged at one end of the second pulverized coal pipe (22) and being arranged around the circumference of the second pulverized coal pipe (22), and the other end of the protrusion (31) extending in a first direction in a direction away from the second pulverized coal pipe (22); A first guide portion (32) and an extension portion (33), wherein one end of the first guide portion (32) is arranged at one end of the first pulverized coal pipe (21) and is arranged around the circumference of the first pulverized coal pipe (21), the other end of the first guide portion (32) extends outward along the circumference of the first pulverized coal pipe (21), the other end of the first guide portion (32) is located outside the protruding portion (31), one end of the extension portion (33) is arranged around the other end of the first guide portion (32), the other end of the extension portion (33) extends toward the protruding portion (31) along the first direction, the extension portion (33) is located outside the protruding portion (31), and the second channel (36) is formed between the outer circumferential surface of the protruding portion (31) and the inner circumferential surfaces of the first guide portion (32) and the extension portion (33); A second guide portion (34), one end of the second guide portion (34) is connected to the outer peripheral surface of the second coal powder pipe (22), the coal outlet (37) is formed at one end of the second guide portion (34) and is opened along the first direction, the second guide portion (34) has an inner cavity (341), the protruding portion (31), the first guide portion (32) and the extension portion (33) are located in the inner cavity (341), and the first channel (35) is formed between the outer peripheral surfaces of the first guide portion (32) and the extension portion (33) and the inner peripheral surface of the second guide portion (34).

6. The pulverized coal combustion stabilizer according to claim 5, characterized in that: The outer peripheral surface of the protrusion (31) is an inclined surface extending along the first direction and gradually moving away from the second pulverized coal pipe (22) from the other end of the protrusion (31) to one end of the protrusion (31).

7. The pulverized coal combustion stabilizer according to claim 6, characterized in that: The inner circumferential surface of the extension portion (33) is an inclined surface and is adapted to the outer circumferential surface of the protruding portion (31), so that the angle a is formed between the central axis of one end of the second channel (36) adjacent to the coal outlet (37) and the central axis of the coal outlet (37), and the central axis of one end of the first channel (35) adjacent to the coal outlet (37) is parallel to the central axis of the coal outlet (37).

8. The pulverized coal combustion stabilizer according to claim 5, characterized in that: The central axis of the protruding portion (31), the central axis of the first guide portion (32) and the central axis of the second guide portion (34) are collinear.

9. The pulverized coal combustion stabilizer according to claim 3, characterized in that: It also includes a branch pipe (4), which is arranged at the other end of the second coal powder pipe (22), the central axis of the branch pipe (4) is orthogonal to the central axis of the second coal powder pipe (22), and the other end of the first coal powder pipe (21) extends out of the other end of the second coal powder pipe (22).

10. A method for operating a pulverized coal combustion stabilizer, characterized in that: include: Pulverized coal is introduced into the first pulverized coal pipe (21), and the pulverized coal in the first pulverized coal pipe (21) flows into the first channel (35) and flows out from the coal outlet (37); Pulverized coal is introduced into the second pulverized coal pipe (22), and the pulverized coal in the second pulverized coal pipe (22) flows into the second channel (36) and flows out from the coal outlet (37); The size of the angle a can be adjusted by adjusting the amount of pulverized coal introduced into the first pulverized coal pipe (21) and the amount of pulverized coal introduced into the second pulverized coal pipe (22).

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