Coal burner

Abstract

The invention discloses a coal burner, and belongs to the technical field of burners. The air adjusting assembly comprises an inner air guide plate and an outer air guide plate which are rotationally mounted on the outer circumferential surface of the primary air pipeline; the number of the inner air deflectors and the number of the outer air deflectors are both m, m is an integer larger than or equal to 2, the m inner air deflectors and the m outer air deflectors are alternately arranged, each outer air deflector can cover a gap between every two adjacent inner air deflectors, and the inner air deflectors and the outer air deflectors are in transmission connection. Wherein the adjacent p inner air deflectors rotate synchronously, the remaining (m-p) inner air deflectors also rotate synchronously, and p is smaller than m. And besides distribution of secondary air and adjustment of the spraying angle, the multi-coal-type adaptability is achieved, the asymmetric working condition can be dealt with, and part of the inner air guide plates and part of the outer air guide plates are independently adjusted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of burners, in particular to a coal burner. BACKGROUND

[0002] The left end of the primary air pipe extends into the secondary air chamber, the inlet of the secondary air chamber is connected to a gas source, and the outlet axis of the secondary air chamber coincides with the axis of the primary air pipe, wherein most of the secondary air (outer air) passes through the secondary air chamber and mixes with the primary air at a specific angle before entering the furnace, and a small part of the secondary air (inner air) mixes with the primary air through the gap of the air adjusting assembly before entering the furnace; and the inner air will mix with the primary air earlier than the outer air, which is the initial combustion air for the primary air, and the outer air is the main air for the primary air combustion, the air adjusting assembly 200 allows the secondary air to mix with the primary air in stages, thereby reducing nitrogen oxides. If the angle is increased, the staged combustion effect can be improved, and the emission of nitrogen oxides can be reduced; if the angle is reduced, the secondary air can be mixed with the primary air earlier to improve the burnout.

[0003] However, in the actual combustion process, considering factors such as the asymmetry of the furnace flow field and the uneven distribution of the coal powder concentration, the combustion will be uneven. If all the inner and outer air deflectors are adjusted synchronously through a single pull ring, the non-symmetrical working conditions (such as partial combustion and uneven furnace flow field) cannot be handled. SUMMARY

[0004] This section is intended to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, the abstract and the title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] In view of the above and / or problems existing in the prior art, the present application is proposed.

[0006] Therefore, the purpose of the present application is to provide a coal burner to solve the above problems.

[0007] To solve the above technical problems, the present application provides the following technical scheme: a coal burner, comprising: a primary air pipe; an air adjusting assembly comprising inner air deflectors and outer air deflectors rotatably installed on the outer circumferential surface of the primary air pipe; the inner air deflectors and the outer air deflectors are each provided with m, m is an integer greater than or equal to 2, the m inner air deflectors and the m outer air deflectors are uniformly and alternately arranged in the circumferential direction of the primary air pipe, and a single outer air deflector can cover the gap between two adjacent inner air deflectors, and the inner air deflectors and the outer air deflectors are transmissionally connected; wherein, adjacent p inner air deflectors rotate synchronously, the remaining m-p inner air deflectors also rotate synchronously, and p < m.

[0008] As a preferred scheme of the coal burner, the drive assembly further comprises a first follower and a second follower slidingly mounted on the primary air duct, the first follower is in transmission connection with the adjacent p inner air guide plates, and the second follower is in transmission connection with the remaining m-p inner air guide plates.

[0009] As a preferred scheme of the coal burner, the drive assembly further comprises a mounting ring rotatably mounted on the primary air duct, and a first pull ring and a second pull ring slidingly mounted on the primary air duct; the first pull ring is in transmission connection with the first follower, and the second pull ring is in transmission connection with the second follower.

[0010] As a preferred scheme of the coal burner, the air adjusting assembly further comprises a first connecting rod, and the first connecting rod is also provided with m, and the two ends of a single first connecting rod are rotatably connected with the adjacent single inner air guide plate and single outer air guide plate as the opposite end faces.

[0011] As a preferred scheme of the coal burner, the outer circumferential surface of the first pull ring is provided with a floating block, the floating block is provided with a first sliding groove, the mounting ring is provided with a first guide rod, the first guide rod is in sliding connection with the first sliding groove, and when the mounting ring rotates in a first direction, the first guide rod drives the first pull ring to slide along the axis direction of the primary air duct.

[0012] As a preferred scheme of the coal burner, one end of the first pull ring facing the mounting ring is provided with a first mounting groove, a first ratchet ring is slidingly mounted in the first mounting groove, a second sliding groove is arranged on the inner wall of the first mounting groove, a second guide rod is arranged on the first ratchet ring, the second guide rod is in sliding connection with the second sliding groove, and when the mounting ring rotates in a second direction, the second guide rod drives the first pull ring to move towards the mounting ring.

[0013] As a preferred scheme of the coal burner, one end of the second pull ring facing the mounting ring is provided with a second mounting groove, a second ratchet ring is slidingly mounted in the second mounting groove, a third sliding groove is arranged on the inner wall of the second mounting groove, a third guide rod is arranged on the second ratchet ring, the third guide rod is in sliding connection with the third sliding groove, and when the mounting ring rotates in a second direction, the third guide rod drives the second pull ring to move towards the mounting ring.

[0014] As a preferred solution of the coal burner of the present invention, wherein: the mounting ring is provided with an annular ratchet groove on the side facing the first pull ring and the second pull ring, when the mounting ring rotates along the second direction, the first ratchet ring and the second ratchet ring are engaged with the annular ratchet groove, and the mounting ring, the first ratchet ring and the second ratchet ring can rotate synchronously along the second direction.

[0015] As a preferred solution of the coal burner of the present invention, a second connecting rod is provided between the first follower and the first pull ring, and between the second follower and the second pull ring.

[0016] As a preferred solution of the coal burner of the present invention, a limiting rod is elastically installed in the first pull ring, and two ends of the limiting rod are respectively in conflict with the floating block and the first ratchet ring.

[0017] The beneficial effects of the present invention are: in addition to being able to distribute secondary air and adjust the injection angle, and being adaptable to multiple types of coal, the present invention can also cope with asymmetric working conditions and individually adjust some inner and outer air guide plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort. Among them:

[0019] Figure 1 This is a structural diagram of a coal burner.

[0020] Figure 2 This is a structural diagram of the drive assembly of a coal burner.

[0021] Figure 3 This is a parts diagram of the drive assembly for a coal burner.

[0022] Figure 4 This is a structural diagram of the first ratchet ring of the coal burner.

[0023] Figure 5 A cross-sectional view of the drive assembly of a coal burner. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present application.

[0026] Secondly, the present application is described in detail in combination with the schematic diagram. In the detailed description of the embodiments of the present application, the sectional view of the device structure is partially enlarged without the general proportion for the convenience of illustration, and the schematic diagram is only an example which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0027] Thirdly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. The "in one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment which is separate or alternative to other embodiments.

[0028] Embodiment 1

[0029] Reference Figure 1 For the first embodiment of the present application, the embodiment provides a coal burner, which comprises a primary air pipe 100 and an air adjusting assembly 200, wherein the primary air pipe 100 is used for the flow of primary air, the primary air pipe 100 is used for installing the air adjusting assembly 200, and the air adjusting assembly 200 is used for adjusting the secondary air injection angle.

[0030] Specifically, the primary air pipe 100 is horizontally arranged, the air inlet end is located at the right end of the primary air pipe 100, and the air outlet end is located at the left end of the primary air pipe 100, and the primary air pipe 100 is used for guiding the flow of primary air.

[0031] The air adjusting assembly 200 comprises an inner air guide plate 201 and an outer air guide plate 202, the right ends of the inner air guide plate 201 and the outer air guide plate 202 are rotatably installed on the outer circumferential surface of the primary air pipe 100; the inner air guide plate 201 and the outer air guide plate 202 are each provided with m, which is an integer greater than or equal to 2, the inner air guide plate 201 and the outer air guide plate 202 of the present application are each provided with 5, and the 5 inner air guide plates 201 and the 5 outer air guide plates 202 are alternately arranged in the circumferential direction of the primary air pipe 100, wherein the outer air guide plate 202 is located outside the inner air guide plate 201, there is a gap between the adjacent two inner air guide plates 201, each outer air guide plate 202 can cover the gap between the adjacent two inner air guide plates 201 corresponding to it, and the inner air guide plate 201 and the outer air guide plate 202 are in transmission connection, and the inner air guide plate 201 and the outer air guide plate 202 can rotate synchronously.

[0032] The five inner guide vanes 201 are divided into two groups, one group of inner guide vanes 201 has two, and the other group of inner guide vanes 210 has three, which means that the two adjacent inner guide vanes 201 in the first group rotate synchronously, and the three inner guide vanes in the second group also rotate synchronously; when the inner guide vanes 201 in the first group and the second group rotate, the corresponding outer guide vanes 202 also rotate. In use, the inner guide vanes 201 in the first group and the second group can rotate synchronously or asynchronously.

[0033] In use, since all existing inner guide vanes 201 and outer guide vanes 202 are synchronously adjusted, it is impossible to cope with asymmetric working conditions such as partial burning and uneven furnace flow field. By independently controlling the inner guide vanes 201 in the first group and the second group in different regions, local angle fine adjustment is supported, which is suitable for circular cutting boilers and W-shaped flame boilers that are prone to skew.

[0034] Embodiment 2

[0035] Reference Figures 1-5 This embodiment is the second embodiment of the present application, which is based on embodiment 1.

[0036] Specifically, it further includes a driving assembly 300 for driving the inner guide vanes 201 in the first group and the second group to rotate. The driving assembly 300 includes a first driven member 301 and a second driven member 302, which are coaxially arranged with the primary air duct 100, and the first driven member 301 and the second driven member 302 are slidingly installed on the primary air duct 100. The first driven member 301 and the second driven member 302 can slide along the length direction of the primary air duct 100. The first driven member 301 is in transmission connection with the two inner guide vanes 201 in the first group, and the second driven member 302 is in transmission connection with the three inner guide vanes 201 in the second group. The first driven member 301 and the second driven member 302 are axially moved to pull the inner guide vanes 201 in the first group and the second group to rotate.

[0037] Preferably, the air regulating assembly 200 further includes a first connecting rod 203, which is also provided with five, and the two ends of a single first connecting rod 203 are respectively in opposite end face rotary connection with adjacent single inner guide vanes 201 and single outer guide vanes 202. The first connecting rod 203 is used to realize the synchronous rotation of the inner guide vanes 201 and the corresponding outer guide vanes 202.

[0038] Preferably, the driving assembly 300 further comprises a mounting ring 303, a first pull ring 304 and a second pull ring 305. Among them, the mounting ring 303, the first pull ring 304 and the second pull ring 305 are located on the right side of the first driven member 301 and the second driven member 302, and the mounting ring 303 is located on the left side of the first pull ring 304 and the second pull ring 305. The mounting ring 303, the first pull ring 304 and the second pull ring 305 are coaxially arranged with the primary air duct 100. The mounting ring 303 is rotationally mounted on the primary air duct 100, and the mounting ring 303 can rotate in a forward direction or a reverse direction around the circumferential direction of the primary air duct 100, wherein the forward direction is defined as the first direction, and the reverse direction is defined as the second direction. The first pull ring 304 and the second pull ring 305 are slidingly mounted on the primary air duct 100, and the first pull ring 304 and the second pull ring 305 can move along the axial direction of the primary air duct 100. The first pull ring 304 is in transmission connection with the first driven member 301, and the second pull ring 305 is in transmission connection with the second driven member 302. The first pull ring 304 can drive the first driven member 301 to move, and the second pull ring 305 can drive the second driven member 302 to move.

[0039] Further, the first driven member 301 and the first pull ring 304, and the second driven member 302 and the second pull ring 305 are both provided with a second connecting rod 308, so as to realize the synchronous movement of the first pull ring 304 and the first driven member 301, and the synchronous movement of the second pull ring 305 and the second driven member 302.

[0040] Preferably, a floating block 304a is elastically mounted on the outer circumferential surface of the first pull ring 304, and a first sliding groove 304a-1 is arranged on the floating block 304a. A first guide rod 303a is arranged on the mounting ring 303, and the first guide rod 303a can extend into the first sliding groove 304a-1. When the mounting ring 303 rotates in the first direction, the first guide rod 303a and the first sliding groove 304a-1 slide with each other, and the first guide rod 303a can drive the first pull ring 304 to slide along the axial direction of the primary air duct 100 towards the mounting ring 303. Thus, the first pull ring 304 drives the first driven member 301 to move to the right, and at this time, the first driven member 301 drives the two inner guide vanes 201 of the first group to rotate alone and drives the corresponding outer guide vane 202 to rotate synchronously. Since the second pull ring 305 is not provided with the first sliding groove 304a-1, the second pull ring 305 cannot be driven to move to the right. At this time, the three inner guide vanes 201 of the second group are stationary, so as to realize the local angle adjustment of the two inner guide vanes 201 of the first group and cope with the asymmetric working condition.

[0041] Preferably, the end of the first pull ring 304 facing the mounting ring 303 is provided with a first mounting groove 304b, the first mounting groove 304b is arc-shaped, a first ratchet ring 306 is elastically mounted in the first mounting groove 304b, and the first ratchet ring 306 can also slide along the arc-shaped direction of the first mounting groove 304b. When the mounting ring 303 rotates in the first direction, the first ratchet ring 306 is squeezed and reciprocally shrunk in the first mounting groove 304b, and the first ratchet ring 306 will not slide along the arc-shaped direction of the first mounting groove 304b due to the external force, so as to avoid the sliding cooperation between the first guide rod 303a and the first sliding groove 304a-1 being blocked. When the mounting ring 303 rotates in the second direction, the first ratchet ring 306 slides along the arc-shaped direction of the first mounting groove 304b due to the external force applied by the mounting ring 303. The inner peripheral wall of the first mounting groove 304b is provided with a second sliding groove 304b-1, the first ratchet ring 306 is provided with a second guide rod 306a, the second guide rod 306a is in sliding connection with the second sliding groove 304b-1, and when the mounting ring 303 rotates in the second direction, the mounting ring 303 drives the first ratchet ring 306 to move along the arc-shaped direction of the first mounting groove 304b, so as to drive the first pull ring 304 to move towards the mounting ring 303 through the sliding cooperation between the second guide rod 306a and the second sliding groove 304b-1.

[0042] Moreover, the end of the second pull ring 305 facing the mounting ring 303 is provided with a second mounting groove 305a, the second mounting groove 305a is arc-shaped, a second ratchet ring 307 is elastically mounted in the second mounting groove 305a, and the second ratchet ring 307 can also slide along the arc-shaped direction of the second mounting groove 305a. When the mounting ring 303 rotates in the first direction, the second ratchet ring 307 is squeezed and reciprocally shrunk in the second mounting groove 305a. The inner peripheral wall of the second mounting groove 305a is provided with a third sliding groove 305a-1, the second ratchet ring 307 is provided with a third guide rod 307a, the third guide rod 307a is in sliding connection with the third sliding groove 305a-1, and when the mounting ring 303 rotates in the second direction, the mounting ring 303 drives the second ratchet ring 307 to move along the arc-shaped direction of the second mounting groove 305a, so as to drive the second pull ring 304 to move towards the mounting ring 303 through the sliding cooperation between the third guide rod 307a and the third sliding groove 305a-1, and thus the first pull ring 304 and the second pull ring 305 are simultaneously moved to the right through the mounting ring 303 rotating in the second direction.

[0043] Further, the installation ring 303 is provided with an annular ratchet groove 303b on one side facing the first pull ring 304 and the second pull ring 305; when the installation ring 303 rotates in the second direction, the first ratchet ring 306 and the second ratchet ring 307 are engaged with the annular ratchet groove 303b, and the installation ring 303, the first ratchet ring 306 and the second ratchet ring 307 can rotate synchronously in the second direction. When the installation ring 303 rotates in the first direction, the first ratchet ring 306 and the second ratchet ring 307 will only be continuously reciprocated and contracted under the extrusion action of the annular ratchet groove 303b, and will not drive the first ratchet ring 306 and the second ratchet ring 307 to rotate synchronously in the first direction.

[0044] Further, the first pull ring 304 is elastically mounted with a floating block 304a on the outer circumferential surface, and the first pull ring 304 is elastically mounted with a limiting rod 309, and the two ends of the limiting rod 309 respectively abut the floating block 304a and the first ratchet ring 306. When the installation ring 303 rotates in the first direction, the limiting rod 309 can make the floating block 304a protrude, so that the first sliding groove 304a-1 on the floating block 304a is in sliding cooperation with the first guide rod 303a, realizing the independent movement of the first pull ring 304. When the installation ring 303 rotates in the second direction, the limiting rod 309 is retracted, the floating block 304a is lowered, the first sliding groove 304a-1 on the floating block 304a is disengaged from the sliding cooperation with the first guide rod 303a, avoiding hindering the rotation of the installation ring in the second direction, and realizing the synchronous movement of the first pull ring and the second pull ring to the right in combination with the movement of the first ratchet ring 306 and the second ratchet ring 307.

[0045] In order to facilitate the understanding of the present application, the working principle thereof will be described below:

[0046] Briefly: when the installation ring 303 rotates in the first direction, only the first pull ring 304 is driven to displace to the right, and the second pull ring 405 is stationary, so only the first driven part 301 is displaced; when the installation ring 303 rotates in the second direction, the first pull ring 304 and the second pull ring 305 are simultaneously driven to displace to the right, driving the first driven part 301 and the second driven part 302 to displace to the right. Since the installation ring 303 will cause the first pull ring 304 to displace to the right in the first direction and the second direction, although the driving modes for realizing the right displacement are different, there will be left-right mutual interference between the parts, especially at the floating block 304a. Therefore, it is necessary to set the floating block 304a to be floating, and when the installation ring 303 rotates in the first direction, the first pull ring 304 is driven to displace to the right through the floating block 304a; when the installation ring 303 rotates in the second direction, the floating block 304a is retracted, and the first pull ring 304 is driven to displace to the right through the first ratchet ring 306.

[0047] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A coal burner, characterized in that: include, Primary air duct (100); An air regulating assembly (200) comprises an inner air guide plate (201) and an outer air guide plate (202) rotatably mounted on the outer circumferential surface of the primary air duct (100); m inner air guide plates (201) and m outer air guide plates (202) are each provided, m being an integer ≥ 2, the m inner air guide plates (201) and the m outer air guide plates (202) being uniformly and alternately arranged around the circumferential direction of the primary air duct (100), and a single outer air guide plate (202) can cover a gap between two adjacent inner air guide plates (201), and the inner air guide plate (201) and the outer air guide plate (202) are transmission-connected; The adjacent p inner air guide plates (201) rotate synchronously, and the remaining mp inner air guide plates also rotate synchronously, and p<m.

2. The coal burner according to claim 1, characterized in that: The air regulating assembly (200) further comprises a first connecting rod (203), wherein m first connecting rods (203) are also provided, and the two ends of a single first connecting rod (203) are respectively rotatably connected to the end faces of an adjacent single inner air guide plate (201) and a single outer air guide plate (202) facing each other.

3. The coal burner according to claim 1 or 2, characterized in that: The invention also includes a driving assembly (300), which includes a first follower (301) and a second follower (302) slidably mounted on the primary air duct (100), wherein the first follower (301) is transmission-connected to the adjacent p inner air guide plates (201), and the second follower (302) is transmission-connected to the remaining mp inner air guide plates (201).

4. The coal burner according to claim 3, characterized in that: The driving assembly (300) further comprises a mounting ring (303) rotatably mounted on the primary air duct (100), and a first pull ring (304) and a second pull ring (305) slidably mounted on the primary air duct (100); the first pull ring (304) is transmission-connected to the first follower (301), and the second pull ring (305) is transmission-connected to the second follower (302).

5. The coal burner according to claim 4, characterized in that: A second connecting rod (308) is provided between the first follower (301) and the first pull ring (304), and between the second follower (302) and the second pull ring (305).

6. The coal burner according to claim 4, characterized in that: A floating block (304a) is provided on the outer circumferential surface of the first pull ring (304), a first sliding groove (304a-1) is provided on the floating block (304a), a first guide rod (303a) is provided on the mounting ring (303), the first guide rod (303a) is slidably connected to the first sliding groove (304a-1), and when the mounting ring (303) rotates in a first direction, the first guide rod (303a) drives the first pull ring (304) to slide along the axial direction of the primary air duct (100).

7. The coal burner according to claim 6, characterized in that: A first mounting groove (304b) is provided at one end of the first pull ring (304) facing the mounting ring (303), a first ratchet ring (306) is slidably installed in the first mounting groove (304b), a second slide groove (304b-1) is provided on the inner wall of the first mounting groove (304b), a second guide rod (306a) is provided on the first ratchet ring (306), the second guide rod (306a) is slidably connected to the second slide groove (304b-1), and when the mounting ring (303) rotates in the second direction, the second guide rod (306a) drives the first pull ring (304) to move toward the direction close to the mounting ring (303).

8. The coal burner according to claim 7, characterized in that: A second mounting groove (305a) is provided at one end of the second pull ring (305) facing the mounting ring (303), a second ratchet ring (307) is slidably installed in the second mounting groove (305a), a third sliding groove (305a-1) is provided on the inner wall of the second mounting groove (305a), a third guide rod (307a) is provided on the second ratchet ring (307), the third guide rod (307a) is slidably connected to the third sliding groove (305a-1), and when the mounting ring (303) rotates in the second direction, the third guide rod (307a) drives the second pull ring (305) to move toward the direction close to the mounting ring (303).

9. The coal burner according to claim 8, characterized in that: The mounting ring (303) is provided with an annular ratchet groove (303b) on one side facing the first pull ring (304) and the second pull ring (305); when the mounting ring (303) rotates in the second direction, the first ratchet ring (306) and the second ratchet ring (307) are engaged with the annular ratchet groove (303b); the mounting ring (303), the first ratchet ring (306) and the second ratchet ring (307) can rotate synchronously in the second direction.

10. The coal burner according to any one of claims 7 to 8, characterized in that: A limiting rod (309) is elastically installed in the first pull ring (304), and two ends of the limiting rod (309) respectively contact the floating block (304a) and the first ratchet ring (306).

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