阅读说明：本技术 一种全负荷段气煤耦合集束燃烧器 (Full-load section gas-coal coupling cluster burner ) 是由 方毅波 俞海玲 张文科 谢辉 胡书意 于 2021-09-24 设计创作，主要内容包括：本发明涉及一种全负荷段气煤耦合集束燃烧器,包括金属软管、电动执行机构、燃气进口圆柱壳体、一次风煤粉管和二次风周界风道,所述燃气进口圆柱壳体的出口端安装有燃气管束,电动执行机构驱动燃气进口圆柱壳体向一次风煤粉管的推进与后退,一次风煤粉管内固定安装有煤粉管束,燃气进口圆柱壳体内固定安装有密封片,燃气管束的进口端侧面设有通流孔,燃气管束的出口端侧面设有固定滑块,煤粉管束的内壁设有螺旋滑槽,固定滑块与螺旋滑槽相配合,燃气管束可在滑块及螺旋滑槽的作用下旋转90°。所述集束燃烧器可实现全负荷段燃气和煤粉的耦合燃烧,尤其是超低负荷稳燃,燃气与煤粉配比调节范围为0～100％。(The invention relates to a full-load section gas-coal coupling cluster burner which comprises a metal hose, an electric actuator, a gas inlet cylindrical shell, a primary air pulverized coal pipe and a secondary air peripheral air duct, wherein a gas pipe bundle is installed at the outlet end of the gas inlet cylindrical shell, the electric actuator drives the gas inlet cylindrical shell to advance and retreat towards the primary air pulverized coal pipe, the primary air pulverized coal pipe is fixedly provided with the pulverized coal pipe bundle, a sealing sheet is fixedly installed in the gas inlet cylindrical shell, the side surface of the inlet end of the gas pipe bundle is provided with a through hole, the side surface of the outlet end of the gas pipe bundle is provided with a fixed sliding block, the inner wall of the pulverized coal pipe bundle is provided with a spiral chute, the fixed sliding block is matched with the spiral chute, and the gas pipe bundle can rotate 90 degrees under the action of the sliding block and the spiral chute. The cluster burner can realize the coupling combustion of fuel gas and coal powder in a full-load section, particularly the ultra-low load stable combustion, and the adjusting range of the fuel gas and coal powder ratio is 0-100%.)

1. The full-load section gas-coal coupling cluster burner is characterized by comprising a metal hose (1), an electric actuator (2), a gas inlet cylindrical shell (3), a primary air pulverized coal pipe (5) and a secondary air peripheral air duct (6), wherein the metal hose (1) is communicated with the inlet end of the gas inlet cylindrical shell (3), a gas pipe bundle (303) is installed at the outlet end of the gas inlet cylindrical shell (3), the outlet end of the gas inlet cylindrical shell (3) is movably inserted into the primary air pulverized coal pipe (5), the electric actuator (2) drives the gas inlet cylindrical shell (3) to push and retreat towards the primary air pulverized coal pipe (5), the primary air pulverized coal pipe (5) is internally and fixedly provided with a pulverized coal pipe bundle (501), and pulverized coal (501) corresponds to the position of the gas pipe bundle (303), the outlet end of the primary air pulverized coal pipe (5) is inserted into the secondary air peripheral air duct (6), and the secondary air peripheral air duct (6) is communicated with a boiler;

gas tube bank (303) with gas inlet cylinder shell (3) rotate to be connected, fixed mounting has gasket (302) in gas inlet cylinder shell (3), the entrance point side of gas tube bank (303) is equipped with through-flow hole (301), the entrance point of gas tube bank (303) is pegged graft in gasket (302), the exit end side of gas tube bank (303) is equipped with fixed slider (304), the inner wall of coal dust tube bank (501) is equipped with spiral spout (502), fixed slider (304) with spiral spout (502) cooperate, and gas tube bank (303) can be rotatory 90 under the effect of fixed slider (304) and spiral spout (502).

2. The full-load section gas-coal coupling cluster burner as claimed in claim 1, wherein gas tube bundles (303) with different lengths are arranged in the gas inlet cylindrical shell (3), the gas tube bundles (303) are uniformly distributed in an annular shape, the lengths of the gas tube bundles (303) are sequentially increased from an outer ring to an inner ring of the annular distribution, a straight groove (503) is formed in the inner wall of the pulverized coal tube bundle (501), the straight groove (503) is communicated with the tail end of the spiral chute (502), and the straight groove (503) is matched with the fixed chute.

3. The full-load section gas-coal coupling cluster burner as claimed in claim 1, wherein pulverized coal tube bundles (501) with different lengths are fixedly installed at the outlet of the primary air pulverized coal tube (5), the pulverized coal tube bundles (501) are uniformly distributed in an annular shape, the lengths of the pulverized coal tube bundles (501) are sequentially increased from the inner ring to the outer ring of the annular distribution, and the interface of the outlet end of the pulverized coal tube bundle (501) of the primary air pulverized coal tube (5) is arranged in a semi-ellipsoid surface.

4. The full-load section gas-coal coupling cluster burner as claimed in claim 1, characterized in that a compressed air sealing (4) assembly is installed at the joint of the gas inlet cylindrical shell (3) and the primary air pulverized coal pipe (5).

5. The full-load section gas-coal coupling cluster burner as claimed in claim 1, characterized in that two through holes (301) are arranged on the side surface of the inlet end of the gas tube bundle (303), and the two through holes (301) are symmetrically distributed on the annular outer wall of the gas tube bundle (303).

6. The full-load section gas-coal coupling cluster burner as claimed in claim 1, wherein a primary air coal powder inlet is formed in the side surface of the primary air coal powder pipe (5), and a secondary air inlet is formed in the side surface of the secondary air peripheral air duct (6).

Technical Field

The invention relates to a full-load section gas-coal coupling cluster burner, and belongs to the technical field of boiler burners.

Background

The boiler burner is the most important equipment in the auxiliary machinery of the coal-fired gas-fired boiler, and along with the increasing proportion of a new energy unit in a power grid, the flexibility requirement of a coal-fired unit is higher and higher, and the deep peak regulation is frequent. The problems of poor boiler combustion stability, insufficient combustion and the like are faced during the deep peak shaving process of the unit, so that the ultralow load combustion stability of the boiler is difficult to realize due to the technical condition limitation of the existing burner. Therefore, the development of the combustor capable of realizing gas-coal coupled combustion in the full-load section has important practical application value.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a full-load section gas-coal coupling cluster burner, in which gas is discharged through a gas pipe bundle and then is sent into a primary air pulverized coal pipe bundle, and the insertion distance is adjusted through an electric actuating mechanism, so that fuels of different circles of pipe bundles can be sequentially switched from pulverized coal to gas combustion, and further, the full-load section gas-coal coupling combustion is realized.

The technical scheme for solving the technical problems is as follows: a full-load section gas-coal coupling cluster burner comprises a metal hose, an electric actuator, a gas inlet cylindrical shell, a primary air pulverized coal pipe and a secondary air peripheral air duct, wherein the metal hose is communicated with the inlet end of the gas inlet cylindrical shell, a gas pipe bundle is installed at the outlet end of the gas inlet cylindrical shell, the outlet end of the gas inlet cylindrical shell is movably inserted into the primary air pulverized coal pipe, the electric actuator drives the gas inlet cylindrical shell to advance and retreat towards the primary air pulverized coal pipe, the primary air pulverized coal pipe is fixedly provided with a pulverized coal pipe bundle, the pulverized coal pipe bundle corresponds to the gas pipe bundle in position, the outlet end of the primary air pulverized coal pipe is inserted into the secondary air peripheral air duct, and the secondary air peripheral air duct is communicated with a boiler;

the gas tube bank with gas inlet cylinder casing rotates to be connected, fixed mounting has the gasket in the gas inlet cylinder casing, the entrance point side of gas tube bank is equipped with the through-flow hole, the entrance point of gas tube bank is pegged graft in the gasket, the exit end side of gas tube bank is equipped with fixed slider, the inner wall of buggy tube bank is equipped with the spiral spout, fixed slider with the spiral spout cooperatees, and gas tube bank can rotate 90 under the effect of fixed slider and spiral spout.

On the basis of the technical scheme, the invention can be further improved as follows:

further, be equipped with the gas tube bank of different length in the gas import cylinder casing, the gas tube bank is cyclic annular evenly distributed, the length of gas tube bank increases from the outer loop of cyclic annular distribution to the inner ring in proper order, the inner wall of buggy tube bank is equipped with the straight flute, the straight flute communicates with each other with the end of spiral spout, the straight flute with fixed spout cooperatees.

Furthermore, pulverized coal tube bundles with different lengths are fixedly installed at the outlet of the primary air pulverized coal tube, the pulverized coal tube bundles are uniformly distributed in an annular shape, the lengths of the pulverized coal tube bundles are sequentially increased from the inner ring to the outer ring of the annular distribution, the interface of the outlet end of the pulverized coal tube bundle of the primary air pulverized coal tube is arranged in a semi-ellipsoid shape, and gas can efficiently enter the boiler to be combusted.

Furthermore, a compressed air sealing assembly is arranged at the joint of the gas inlet cylindrical shell and the primary air pulverized coal pipe. The air pressure in the primary air pulverized coal pipe is high, and the arrangement of the compressed air sealing assembly can effectively avoid the air leakage phenomenon between the gas inlet cylindrical shell and the primary air pulverized coal pipe.

Furthermore, two through flow holes are formed in the side face of the inlet end of the gas tube bundle, and the two through flow holes are symmetrically distributed in the annular outer wall of the gas tube bundle.

Furthermore, a primary air pulverized coal inlet is formed in the side face of the primary air pulverized coal pipe, and a secondary air inlet is formed in the side face of the secondary air peripheral air duct.

The invention has the beneficial effects that: in the initial state, the gas pipe bundle and the coal powder pipe bundle are in a separated state, primary air coal powder is introduced into the primary air coal powder pipe, combustion-supporting secondary air is introduced into the secondary air peripheral air duct, and the through-flow hole is blocked by the sealing sheet; when gas is required to be introduced into the boiler, the gas is introduced into the metal hose, the electric actuating mechanism pushes the gas inlet cylindrical shell into the primary air pulverized coal pipe, the gas pipe bundle with the longer length positioned in the inner ring is firstly communicated with the pulverized coal pipe bundle, the corresponding fixed sliding block is matched with the spiral chute, and the gas pipe bundle with the longer length is rotated by 90 degrees under the action of the spiral chute, so that the through-flow hole on the gas pipe bundle with the longer length is staggered with the sealing sheet, and the gas enters the gas pipe bundle and the pulverized coal pipe bundle through the through-flow hole and finally is introduced into the boiler; when the proportion of the fuel gas needs to be improved, the electric actuating mechanism continuously pushes the cylindrical shell of the fuel gas inlet into the primary air pulverized coal pipe, the fixed slide block on the fuel gas pipe bundle with the longer length of the inner ring slides in the straight groove, the fuel gas pipe bundle with the longer length does not rotate, the fuel gas pipe bundle with the shorter length positioned on the outer ring also starts to be communicated with the pulverized coal pipe bundle, the fixed slide block on the fuel gas pipe bundle with the shorter length is matched with the spiral slide groove, the fuel gas pipe bundle with the shorter length is rotated by 90 degrees, so that the through hole on the fuel gas pipe bundle with the shorter length is staggered with the sealing sheet, the fuel gas enters the fuel gas pipe bundle and the pulverized coal pipe bundle through the through hole, the fuel in the pulverized coal pipe bundle is switched from pulverized coal to fuel gas for combustion, and further the coupled combustion of the fuel gas and the pulverized coal in the full-load section is realized, particularly the ultra-low-load stable combustion, the adjusting range of the ratio of the fuel gas and the pulverized coal is 0-100 percent, and the operation is simple, is convenient to use.

Drawings

FIG. 1 is an internal cross-sectional view of the cluster burner in an embodiment;

FIG. 2 is a right side view of the cluster burner in the embodiment;

in the figure, 1 a metal hose, 2 an electric actuator, 3 a gas inlet cylindrical shell, 4 a compressed air seal, 5 a primary air pulverized coal pipe and 6 a secondary air peripheral air channel;

301 through-flow holes, 302 sealing plates, 303 gas tube bundles and 304 fixed sliding blocks;

501 pulverized coal tube bundle, 502 spiral chute and 503 straight chute.

Detailed Description

The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As shown in fig. 1-2, a full-load section gas-coal coupling cluster burner comprises a metal hose 1, an electric actuator 2, a gas inlet cylindrical shell 3, a primary air pulverized coal pipe 5 and a secondary air peripheral air duct 6, wherein the metal hose 1 is communicated with an inlet end of the gas inlet cylindrical shell 3, a gas pipe bundle 303 is installed at an outlet end of the gas inlet cylindrical shell 3, an outlet end of the gas inlet cylindrical shell 3 is movably inserted into the primary air pulverized coal pipe 5, the electric actuator 2 drives the gas inlet cylindrical shell 3 to advance and retreat towards the primary air pulverized coal pipe 5, a pulverized coal pipe bundle 501 is fixedly installed in the primary air pulverized coal pipe 5, the pulverized coal pipe bundle 501 corresponds to the gas pipe bundle 303, an outlet end of the primary air pulverized coal pipe 5 is inserted into the secondary air peripheral air duct 6, the secondary air peripheral air duct 6 is communicated with the boiler;

gas tube bank 303 with gas inlet cylinder shell 3 rotates and connects, fixed mounting has gasket 302 in the gas inlet cylinder shell 3, the entrance point side of gas tube bank 303 is equipped with through-flow hole 301, the entrance point of gas tube bank 303 is pegged graft in the gasket 302, the exit end side of gas tube bank 303 is equipped with fixed slider 304, the inner wall of coal dust tube bank 501 is equipped with spiral spout 502, fixed slider 304 with spiral spout 502 cooperatees, and gas tube bank 303 can rotate 90 under the effect of fixed slider 304 and spiral spout 502.

Specifically, be equipped with the gas tube bank 303 of different length in the gas import cylindrical shell 3, gas tube bank 303 is cyclic annular evenly distributed, in this embodiment gas tube bank 303 is equipped with three circles, gas tube bank 303's length increases from the outer loop of cyclic annular distribution to the inner ring in proper order, and the gas tube bank 303 of the inner circle is the longest promptly, and the gas tube bank 303 of the outer circle is the shortest, as shown in fig. 1. The inner wall of the pulverized coal tube bundle 501 is provided with a straight groove 503, the straight groove 503 is communicated with the tail end of the spiral chute 502, and the straight groove 503 is matched with the fixed chute.

Specifically, the outlet of the primary air pulverized coal pipe 5 is fixedly provided with pulverized coal pipe bundles 501 with different lengths, the pulverized coal pipe bundles 501 are uniformly distributed in an annular shape, and in this embodiment, the pulverized coal pipe bundles 501 are provided with four circles, as shown in fig. 2. The lengths of the pulverized coal tube bundles 501 sequentially increase from inner rings to outer rings in annular distribution, and the outlet end interface of the pulverized coal tube bundles 501 of the primary air pulverized coal tubes 5 is arranged in a semi-ellipsoid shape, namely, the most inner ring pulverized coal tube bundle 501 is shortest and the most outer ring pulverized coal tube bundle 501 is longest.

Specifically, a compressed air sealing 4 assembly is arranged at the joint of the gas inlet cylindrical shell 3 and the primary air pulverized coal pipe 5. The air pressure in the primary air pulverized coal pipe 5 is large, and the arrangement of the compressed air seal 4 component can effectively avoid the air leakage phenomenon between the gas inlet cylindrical shell 3 and the primary air pulverized coal pipe 5.

Specifically, two through holes 301 are arranged on the side surface of the inlet end of the gas tube bundle 303, and the two through holes 301 are symmetrically distributed on the annular outer wall of the gas tube bundle 303.

Specifically, the side of the primary air pulverized coal pipe 5 is provided with a primary air pulverized coal inlet, and the side of the secondary air peripheral air duct 6 is provided with a secondary air inlet.

The operating principle of the cluster burner in the embodiment is as follows:

in this embodiment, the three circles of gas tube bundles 303 are sequentially named as a first circle of gas tube bundles 303, a second circle of gas tube bundles 303 and a third circle of gas tube bundles 303 from the inner circle to the outer circle; the four circles of arranged coal dust tube bundles 501 are sequentially named as a first circle of coal dust tube bundles 501, a second circle of coal dust tube bundles 501, a third circle of coal dust tube bundles 501 and a fourth circle of coal dust tube bundles 501 from the inner circle to the outer circle; the first circle of gas tube bundles 303 is communicated with the first circle of coal dust tube bundles 501 all the time, the second circle of gas tube bundles 303 corresponds to the second circle of coal dust tube bundles 501 in position, the third circle of gas tube bundles 303 corresponds to the third circle of coal dust tube bundles 501 in position, the fourth circle of coal dust tube bundles 501 is not communicated with the gas tube bundles 303, and the fourth circle of coal dust tube bundles 501 are communicated with primary air coal dust all the time;

in an initial state, the second circle of gas tube bundle 303 and the second circle of coal powder tube bundle 501 are in a separation state, the third circle of gas tube bundle 303 and the third circle of coal powder tube bundle 501 are in a separation state, gas is introduced into the metal hose 1, primary air coal powder is introduced into the primary air coal powder tube 5, combustion-supporting secondary air is introduced into the secondary air peripheral air duct 6, and the through-flow holes 301 are blocked by the sealing sheets 302 of the second circle of gas tube bundle 303 and the third circle of gas tube bundle 303;

when gas needs to be added into the boiler, the electric actuator 2 pushes the gas inlet cylindrical shell 3 into the primary air pulverized coal pipe 5, the second circle of gas pipe bundle 303 with longer length is firstly communicated with the second circle of pulverized coal pipe bundle 501, the corresponding fixed sliding block 304 is matched with the spiral chute 502, under the action of the spiral chute 502, the second circle of gas pipe bundle 303 is rotated by 90 degrees, so that the through-flow hole 301 on the second circle of gas pipe bundle 303 is staggered with the sealing sheet 302, and the gas enters the second circle of gas pipe bundle 303 and the second circle of pulverized coal pipe bundle 501 through the through-flow hole 301 and finally is communicated into the boiler;

when more gas is needed in the boiler, the electric actuator 2 continuously pushes the gas inlet cylindrical shell 3 into the primary air pulverized coal pipe 5, then the fixed slide block 304 on the second circle of gas pipe bundle 303 with longer length slides in the straight groove 503, the second circle of gas pipe bundle 303 does not rotate, the through-flow hole 301 on the second circle of gas pipe bundle 303 is not blocked, the second circle of gas pipe bundle 303 continuously passes through the gas, the third circle of gas pipe bundle 303 with shorter length positioned on the outer ring also starts to be communicated with the third circle of pulverized coal pipe bundle 501, the fixed slide block 304 is matched with the spiral chute 502, the third circle of gas pipe bundle 303 is rotated by 90 degrees, so that the through-flow hole 301 on the third circle of gas pipe bundle 303 is staggered with the sealing sheet 302, the gas enters the third circle of gas pipe bundle 303 and the third circle of pulverized coal pipe bundle 501 through the through-flow hole 301, the fuel in the third circle of pulverized coal pipe bundle 501 is switched from pulverized coal to gas combustion, and further, coupling combustion of fuel gas and coal powder at a full-load section is realized, especially stable combustion at ultra-low load is realized, and the adjusting range of the fuel gas and coal powder ratio is 0-100%.

When needs reduce and provide the gas to the boiler, electric actuator 2 drives 3 backs of gas inlet cylinder casing to make separation between second circle gas tube bank 303 and the second circle coal dust tube bank 501, separation between third circle gas tube bank 303 and the third circle coal dust tube bank 501, the through-flow hole 301 is blocked up once more to the gasket 302 on second circle gas tube bank 303 and the third circle gas tube bank 303.

In practical application, the gas tube bundle 303 and the pulverized coal tube bundle 501 with different ring number distributions can be arranged according to specific requirements.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.