CN111520709A

CN111520709A - Novel direct-current pulverized coal burner capable of stabilizing flame

Info

Publication number: CN111520709A
Application number: CN202010278891.2A
Authority: CN
Inventors: 王德志
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2020-08-11

Abstract

The invention relates to the technical field of burners, and discloses a novel flame-stabilizing direct-current pulverized coal burner, which comprises a pulverized coal furnace, wherein burner shells penetrating through the wall of the pulverized coal furnace are fixedly arranged at four corners of the pulverized coal furnace at equal intervals, each burner shell is a cuboid with an opening at one end and a hollow interior, a pulverized coal pipe is fixedly arranged in the middle of one closed end of each burner shell, splitter plates are fixedly arranged at equal intervals in the pulverized coal pipes, a first side baffle is fixedly arranged at one end of an outlet of each pulverized coal pipe, the novel flame-stabilizing direct-current pulverized coal burner is characterized in that a splitter plate is arranged in each pulverized coal pipe extending into the corresponding burner shell, pulverized coal can be gathered to one side of each pulverized coal pipe after colliding with the splitter plate by the aid of the splitting action of the splitter plate, then the pulverized coal can leave the pulverized coal pipes along with a small amount of primary air, and most of the primary air can carry a small amount of pulverized coal to leave from the other side of each pulverized coal, thus, the primary air is separated from the pulverized coal, and the concentration of the pulverized coal is improved.

Description

Novel direct-current pulverized coal burner capable of stabilizing flame

Technical Field

The invention relates to the technical field of burners, in particular to a novel flame-stabilizing direct-current pulverized coal burner.

Background

The pulverized coal burner is divided into a direct-current pulverized coal burner and a rotational-flow pulverized coal burner, wherein the direct-current burner is usually arranged at four corners of a hearth, four air flows sprayed by the four burners form a 'false tangent circle' at the center of a furnace chamber, the pulverized coal at the center of the furnace chamber can be fully and rotatably combusted at the center of the furnace chamber through the mutual cooperation of the four groups of burners, but the existing direct-current pulverized coal burner always has the following problems in use:

the existing direct current pulverized coal burner directly conveys pulverized coal into a furnace chamber for burning through primary air, the primary air can be mixed with the pulverized coal in the process of conveying the pulverized coal, the concentration of the pulverized coal in unit volume is reduced, and the pulverized coal burner needs to use a large amount of fuel oil for combustion supporting when the pulverized coal burner is ignited to rise and shut down, so that the ignition difficulty of the pulverized coal burner is increased due to the low-concentration pulverized coal, the consumption of the fuel oil is increased, the cost is increased, meanwhile, the pulverized coal is directly mixed with the primary air and then enters the furnace chamber for simultaneous burning, so that the pulverized coal is completely burnt in the high-temperature and oxygen-sufficient furnace chamber, the burning reaction is severe, the generation of nitrogen oxides is increased, the environment is polluted, and the pulverized coal is not well accumulated in the direct current burner for temperature rise, so that the pulverized coal is mostly burnt by means of high-temperature flue gas in the furnace chamber, the ignition period of the pulverized coal is delayed, so that the amount of soot generated before the pulverized coal is ignited is increased, the combustion efficiency of the pulverized coal is reduced, in addition, the load of the pulverized coal furnace is unstable when the load is lower than seventy percent by using the conventional pulverized coal burner, so that fuel oil needs to be added for combustion supporting, and the consumption of the fuel oil is further increased.

Disclosure of Invention

The invention provides a novel flame-stabilizing direct-current pulverized coal burner, which has the advantages of low cost, small environmental pollution and high combustion efficiency and solves the problems in the background technology.

The invention provides the following technical scheme: a novel direct-current pulverized coal burner capable of stabilizing flame comprises a pulverized coal furnace, wherein a burner shell penetrating through the wall of the pulverized coal furnace is fixedly installed at the four corners of the pulverized coal furnace at equal intervals, the burner shell is a cuboid with an opening at one end and a hollow inner part, a pulverized coal pipe is fixedly installed in the middle of one closed end of the burner shell, a splitter plate is fixedly installed at the inner part of the pulverized coal pipe at equal intervals, a first side baffle is fixedly installed at one end of an outlet of the pulverized coal pipe, a second side baffle is fixedly installed at the other end of the outlet of the pulverized coal pipe, an arc-shaped flow rotating plate is fixedly installed at one end of the second side baffle, the first side baffle, the second side baffle and the arc-shaped flow rotating plate are fixedly installed between the front and the back of the inner wall of the burner shell, a guide plate is fixedly installed between the front and the back of the burner shell, and a, the other end fixedly connected with second shrouding of guide plate, the one end fixed mounting of second shrouding is in the bottom surface of arc cavity inner wall, the hollow drainage shell of one end fixedly connected with between first shrouding and the combustor shell inner wall bottom surface, the one end fixed mounting of hollow drainage shell has the arc cavity that is located between the combustor shell inner wall front and the back.

Preferably, the flow distribution plate has a vertical downward trend in the vertical direction, a gap is reserved between the upper and lower adjacent flow distribution plates, and the end faces of the upper and lower ends of the flow distribution plate are horizontal.

Preferably, the first sealing plate is S-shaped and is fixedly installed inside the burner housing, the center of the protruding portion of the upper end of the S-shape coincides with the center line of the pulverized coal pipe in the vertical direction, and the corresponding diameters of the upper portion and the lower portion of the S-shape of the first sealing plate are the same and smaller than the height of the pulverized coal pipe in the vertical direction.

Preferably, the diameter of the circle where the guide plate is located is smaller than that of the circle where the first sealing plate is located, and the position of the circle center of the arc where the guide plate is located in the vertical direction is lower than the height of the tail end of the lower portion of the first sealing plate in the vertical direction.

Preferably, the arc-shaped cavity is positioned on one side of the pulverized coal pipe with high primary air content and is a horizontal straight plate fixedly connected with the top end of the semicircle and coincident with the tangential direction of the semicircle, the bottom end of the semicircle is fixedly connected with a folded plate which is partially folded towards the circle center of the semicircle when the arc-shaped cavity is positioned on one side of the pulverized coal pipe with high pulverized coal content, and the direction of the rotation angle of the burner shell installed on the pulverized coal furnace is installed after the burner shell rotates from the center of the pulverized coal furnace to one side of the arc-shaped cavity with the folded plate.

The invention has the following beneficial effects:

the novel direct-current pulverized coal burner with stable flame is characterized in that the splitter plate is arranged in the pulverized coal pipe extending into the burner shell, pulverized coal can be gathered towards one side of the pulverized coal pipe after colliding with the splitter plate by utilizing the splitting effect of the splitter plate, then the pulverized coal pipe leaves along with a small amount of primary air, most of the primary air can carry a small amount of pulverized coal to leave from the other side of the pulverized coal pipe, so that the primary air is separated from the pulverized coal, the concentration of the pulverized coal is improved, the high-concentration pulverized coal can suddenly drop in speed due to the increase of space when entering the arc-shaped cavity, the pulverized coal is gathered in the arc-shaped cavity in a large amount, the pulverized coal is well ignited by the entrainment of high-temperature flue gas blown by the adjacent burner arranged on the pulverized coal burner and the high-speed negative pressure formed by the high wind speed on the two sides outside the arc-shaped cavity, the ignition period of the pulverized coal is advanced, the ignition difficulty of the pulverized coal is reduced, so that the fuel consumption is saved, the cost is reduced, the combustion stability of the pulverized coal furnace is improved, and the low-load working range of the pulverized coal is further expanded.

Drawings

FIG. 1 is a schematic top view of a pulverized coal furnace and burner arrangement according to the present invention;

FIG. 2 is a schematic cross-sectional view of a burner constructed in accordance with the present invention;

FIG. 3 is a schematic cross-sectional view of a hollow drainage shell of the present invention.

In the figure: 1. a pulverized coal furnace; 2. a burner housing; 3. a pulverized coal pipe; 4. a flow distribution plate; 5. a first side dam; 6. a second side baffle; 7. an arc-shaped flow converter; 8. a baffle; 9. a first seal plate; 10. a second seal plate; 11. a hollow drainage shell; 12. an arc-shaped concave cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, a novel flame-stabilizing direct-current pulverized coal burner comprises a pulverized coal furnace 1, burner housings 2 are fixedly installed at four corners of the pulverized coal furnace 1 at equal intervals and penetrate through the cavity wall of the pulverized coal furnace 1, each burner housing 2 is a cuboid with an opening at one end and a hollow interior, a pulverized coal pipe 3 is fixedly installed at the middle of the closed end of each burner housing 2, splitter plates 4 are fixedly installed at the interiors of the pulverized coal pipes 3 at equal intervals, a first side baffle 5 is fixedly installed at one end of an outlet of each pulverized coal pipe 3, a second side baffle 6 is fixedly installed at the other end of the outlet of each pulverized coal pipe 3, an arc-shaped splitter plate 7 is fixedly installed at one end of each second side baffle 6, the first side baffle 5, the second side baffle 6 and the arc-shaped splitter plates 7 are fixedly installed between the front surface and the back surface of the inner wall of the burner housing 2, a splitter plate 8 is fixedly, the first shrouding 9 of one end fixedly connected with of guide plate 8, the other end fixedly connected with second shrouding 10 of guide plate 8, the one end fixed mounting of second shrouding 10 is in the bottom surface of arc cavity 12 inner wall, the hollow drainage shell 11 of one end fixedly connected with between first shrouding 9 and the 2 inner wall bottom surfaces of combustor shell, and the one end fixed mounting of hollow drainage shell 11 has the arc cavity 12 that is located between the 2 inner wall front of combustor shell and the back.

Wherein, the splitter plate 4 has the downward trend of the vertical direction, the splitter plate 4 leaves the interval between two adjacent above and below, and the terminal surface of the upper and lower both ends of splitter plate 4 is horizontal, because the pulverized coal is heavy compared with the primary air, so the pulverized coal will gather to one end of the inside of pulverized coal pipe 3 slowly along the sloping wall of splitter plate 4 under the blocking effect of splitter plate 4, and the primary air can flow out from the interval between the adjacent splitter plates 4 more easily compared with the pulverized coal, only a small amount of pulverized coal will flow away from the interval with the primary air, thus have formed one end in the outlet section of the pulverized coal pipe 3 and mixed the low concentration primary air of high concentration pulverized coal and mixed the low concentration pulverized coal of the other end, the gathering to the pulverized coal concentration is favorable to the advance of the later stage ignition period, reduce the amount of pulverized coal spraying fuel oil, the cost is reduced, and the flame stability of the burner is improved.

Wherein, the first closing plate 9 is S-shaped and fixed in the burner shell 2, and the center of the projecting part of the upper end of the S-shape coincides with the central line of the coal powder pipe 3 in the vertical direction, the corresponding diameters of the upper and lower parts of the S-shape of the first closing plate 9 are the same and smaller than the height of the coal powder pipe 3 in the vertical direction, the part of the lower end coal powder gathering can smoothly enter the concave part of the S-shape of the first closing plate 9 under the blowing action of primary air by virtue of the difference between the middle of the S-shape of the first closing plate 9 facing the outlet of the coal powder pipe 3 and the height of the coal powder pipe 3 and combining the flow distribution plate 4 arranged in the coal powder pipe 3, so that the coal powder moves in an arc shape in the part and then enters the guide plate 8 to increase the length of the flow path, and the distance of the end of the coal powder pipe 3 with large primary air content is smaller than that of the end with large coal powder content, therefore, primary air can flow out of the combustor shell 2 at an accelerated speed firstly, a required outer side low-pressure environment is formed for ignition of coal dust in the arc-shaped concave cavity 12, entrainment of high-temperature flue gas is enhanced, the combustion temperature of the primary air with low coal dust content is far lower than that of high coal dust concentration, and an oxygen-deficient combustion area and a sufficient oxygen combustion area are formed, so that the combustion stage is separated, and the generation amount of nitrogen oxides is reduced.

Wherein, the guide plate 8 is less than the circular arc of the circle diameter of first shrouding 9 place for the circle diameter of place, the centre of a circle of the circular arc of guide plate 8 place is less than the height at the vertical direction place of the terminal end in the vertical direction of 9 lower parts of first shrouding in the position of the vertical direction, the buggy can enter into the cavity of guide plate 8 after the removal through the cavity of 9 lower parts of first shrouding like this, such difference in height can make the buggy can cut into the inside of advancing guide plate 8 with the wide-angle, make the buggy can leave behind first shrouding 9 smooth cavity along guide plate 8 continue to turn to the flow, the mobility of buggy has been guaranteed, thereby the feasibility of whole device has been guaranteed.

Wherein, the arc cavity 12 is located on the side of the pulverized coal pipe 3 with much primary wind content and is a horizontal straight plate fixedly connected with the semicircular top end and coincided with the tangential direction, the arc cavity 12 is located on the side of the pulverized coal pipe 3 with much pulverized coal content and is fixedly connected with a folded plate with a part deflected to the semicircular circle center at the semicircular bottom end, the rotating angle direction of the burner shell 2 installed on the pulverized coal furnace 1 is that the burner shell is installed after rotating from the inner center of the pulverized coal furnace 1 to the side of the arc cavity 12 with the folded plate, so that the pulverized coal is gathered and ignited in the inner cavity of the arc cavity 12 and then blows out of the arc cavity 12 along with the subsequent pulverized coal and the primary wind, and the flame can be sprayed out towards the reverse direction of the installation rotation under the guiding action of the folded plate, namely, the pulverized coal is sprayed out towards the direction of the previous adjacent burner, thus ensuring that the ignited pulverized coal sprayed by the burner cannot be sprayed out of the fired pulverized coal sprayed out of the burner due to the flame The pulverized coal is blown to the back fire side of the burner, the pulverized coal burnt by the back fire side is prevented from being bonded, the pulverized coal combustion efficiency is improved, the probability of slag bonding of the inner wall of the pulverized coal furnace 1 is reduced, and the heat transfer efficiency of the furnace wall is improved, so that the efficiency of the pulverized coal furnace is improved, and the combustion stability of the pulverized coal furnace is also improved.

When the coal dust collecting device works, the primary air carries the coal dust to be transported in the coal dust pipe 3, when the mixed airflow of the coal dust and the primary air flows through the splitter plate 4, the coal dust is slowly gathered and deviated to one side due to the blocking of the splitter plate 4, most of the primary air flows through the gap between the splitter plates 4, so that a large amount of the coal dust and a large amount of the primary air are separated at two sides of the coal dust pipe 3, one end containing a large amount of the coal dust tangentially enters the groove of the first seal plate 9 under the blowing of a small amount of the primary air, the coal dust rotationally moves along the groove of the first seal plate 9 under the blowing of the primary air, enters the arc-shaped deflector 7 to rotationally flow after being separated from the first seal plate 9, then flows into the hollow drainage shell 11 through the middle channel, enters the arc-shaped cavity 12 under the gathering effect of the top end of the hollow drainage shell 11, the coal dust entering the arc-shaped cavity 12 can suddenly drop in speed due to the sudden change of, one end of a small amount of pulverized coal carried by a large amount of primary air enters a channel formed between the second sealing plate 10 and the inner wall of the burner shell 2 to flow, when the pulverized coal flows through the turning part of the second sealing plate 10, one part of the pulverized coal directly flows out in an accelerating way through a gap between the burner shell 2 and one end of the arc-shaped concave cavity 12, the other part of the pulverized coal flows in a rotating way to flow into a gap between the burner shell 2 and the other end of the arc-shaped concave cavity 12 in an accelerating way, so that high-speed airflow is formed at two ends of the outer side of the arc-shaped concave cavity 12, the high-speed airflow is low in pressure intensity, and the high-temperature flue gas blown by the burner at an adjacent angle is combined with the pressure of the high-temperature flue gas, so that the high-temperature flue gas rapidly sucks the high-concentration high-temperature air gathered in the arc-shaped concave cavity 12 and the high-oxygen high-, the ignition period of the coal dust is advanced, the ignition difficulty of the coal dust is reduced, and the combustion stability is improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a novel direct current pulverized coal burner of steady flame, includes pulverized coal stove (1), its characterized in that: the coal powder burner is characterized in that a burner shell (2) penetrating through the wall of the coal powder burner (1) is fixedly installed at the four corners of the coal powder burner (1) at equal intervals, the burner shell (2) is a cuboid with an opening at one end and a hollow inner part, a coal powder pipe (3) is fixedly installed at the middle part of one end of the closed burner shell (2), a splitter plate (4) is fixedly installed at the inner part of the coal powder pipe (3) at equal intervals, a first side baffle (5) is fixedly installed at one end of an outlet of the coal powder pipe (3), a second side baffle (6) is fixedly installed at the other end of the outlet of the coal powder pipe (3), an arc-shaped diversion plate (7) is fixedly installed at one end of the second side baffle (6), the first side baffle (5), the second side baffle (6) and the arc-shaped diversion plate (7) are fixedly installed between the front face and the back face of the inner wall of the burner shell (2), and a diversion plate (8, the utility model discloses a burner, including the first shrouding of one end fixedly connected with (9) of guide plate (8), the other end fixedly connected with second shrouding (10) of guide plate (8), the one end fixed mounting of second shrouding (10) is in the bottom surface of arc cavity (12) inner wall, the hollow drainage shell (11) of one end fixedly connected with between first shrouding (9) and burner housing (2) inner wall bottom surface, the one end fixed mounting of hollow drainage shell (11) has arc cavity (12) that are located burner housing (2) inner wall between openly and the back.

2. The novel direct-flow pulverized coal burner of claim 1, characterized in that: the flow distribution plate (4) has a vertical downward trend in the vertical direction, a gap is reserved between the upper and lower adjacent flow distribution plates (4), and the end faces of the upper and lower ends of the flow distribution plate (4) are horizontal.

3. The novel direct-flow pulverized coal burner of claim 1, characterized in that: the first sealing plate (9) is S-shaped and is fixedly arranged in the combustor shell (2), the circle center of the protruding part at the upper end of the S shape is overlapped with the center line of the pulverized coal pipe (3) in the vertical direction, and the corresponding diameters of the upper part and the lower part of the S shape of the first sealing plate (9) are the same and are smaller than the height of the pulverized coal pipe (3) in the vertical direction.

4. The novel direct-flow pulverized coal burner of claim 1, characterized in that: the diameter of the circle where the guide plate (8) is located is smaller than that of the circle where the first sealing plate (9) is located, and the position of the circle center of the arc where the guide plate (8) is located in the vertical direction is lower than the height of the tail end of the lower portion of the first sealing plate (9) in the vertical direction.

5. The novel direct-flow pulverized coal burner of claim 1, characterized in that: the utility model discloses a pulverized coal burner, including arc cavity (12), pulverized coal pipe (3), the one side that the many wind content of arc cavity (12) is located pulverized coal pipe (3) is its semicircle top end fixed connection rather than the straight board of the level of tangential direction coincidence, its semicircle bottom end fixed connection have to the partial zigzag board of semicircle centre of a circle when arc cavity (12) is located pulverized coal pipe (3) the many one side of pulverized coal content, the rotation angle direction of combustor shell (2) installation on pulverized coal burner (1) is from pulverized coal burner (1) inside center to the rotatory back installation of one side that arc cavity (12) has the zigzag board.