CN210568383U

CN210568383U - Heat accumulating type coal injection burner

Info

Publication number: CN210568383U
Application number: CN201920240279.9U
Authority: CN
Inventors: 邹国泉
Original assignee: Wuhan Furui Energy Technology Co ltd
Current assignee: Wuhan Furui Energy Technology Co ltd
Priority date: 2019-02-21
Filing date: 2019-02-21
Publication date: 2020-05-19
Anticipated expiration: 2029-02-21

Abstract

The utility model relates to a heat accumulation formula coal injection nozzle, include the casing and insert the coal injection rifle of locating on the casing, the casing has heat-resisting chamber and separates for two circulation rooms through the partition wall, all is equipped with the heat accumulator in two circulation rooms, and each circulation room one end is equipped with tuber pipe interface and the other end link up the casing and forms the wind gap. The heat accumulating type coal injection burner divides the heat-resistant cavity of the shell into two circulation chambers and respectively arranges the heat accumulators in the two circulation chambers, smoke and blast are alternately discharged through the two circulation chambers, so that the two heat accumulators alternately accumulate heat and preheat combustion air, the high-temperature coal injection combustion flue gas is adopted to preheat the combustion air, and the preheating mode of direct contact heat exchange of the heat accumulators and the combustion air is adopted, so that the preheating effect of the combustion air can be effectively ensured, and the equipment cost and the occupied area are reduced. The blast air and the smoke exhaust are carried out on the same heat accumulating type coal injection burner, the coal injection is not switched, the flame is stable continuously, no black smoke is generated, and the ignition frequency can be reduced.

Description

Heat accumulating type coal injection burner

Technical Field

The utility model belongs to the technical field of the nozzle, concretely relates to heat accumulation formula coal injection nozzle.

Background

In the metallurgical industry, industrial furnaces such as steel rolling heating furnaces, annealing furnaces and boilers and the like often adopt coal injection burners. The coal injection burner is generally provided with a coal injection pipe in the center of a shell, an annular air circulation cavity channel is arranged around the coal injection pipe, and the sprayed combustion-supporting air surrounds pulverized coal flow at the head of the nozzle to promote the pulverized coal to be fully combusted; or the pulverized coal and the combustion air are mixed in the burner and then sprayed out.

In order to improve the combustion efficiency of pulverized coal, a scheme of preheating combustion air is often adopted, namely a heat exchanger is arranged on a combustion air pipeline, so that the mode is low in heat utilization rate, poor in combustion air preheating effect, and increased in equipment cost and occupied space.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a heat accumulation formula coal injection nozzle can solve prior art's partial defect at least.

The embodiment of the utility model relates to a heat accumulation formula coal injection nozzle, locate including the casing with inserting coal injection rifle on the casing, the casing has heat-resisting chamber just heat-resisting chamber separates for two circulation rooms, two through the partition wall all be equipped with the heat accumulator in the circulation room, each circulation room one end is equipped with tuber pipe interface and the other end link up the casing forms the wind gap.

As one embodiment, the coal injection lance is inserted into the partition wall.

In one embodiment, the two air ports are symmetrically arranged relative to the partition wall, and the coal injection gun is located at the center of the partition wall.

In one embodiment, the flow-through chamber comprises a transition section with gradually changed flow area, and the narrow end of the transition section is communicated with the tuyere.

In one embodiment, the flow-through chamber further includes a heat exchange section with a constant flow area and communicated with the wide end of the transition section, and the heat accumulator is disposed in the heat exchange section.

As one embodiment, the housing is a square housing.

In one embodiment, the partition wall is formed by pouring refractory materials.

In one embodiment, the head of the coal injection gun protrudes out of the shell, and the partition wall correspondingly protrudes out of the shell.

The embodiment of the utility model provides a following beneficial effect has at least:

the utility model provides a heat accumulation formula coal injection nozzle, separate the heat-resisting chamber of casing for two circulation rooms and set up the heat accumulator in two circulation rooms respectively, discharge fume and blast air in turn through two circulation rooms, can make two heat accumulators heat accumulation in turn and preheat combustion air, coal injection burning flue gas that adopts the high temperature preheats combustion air, and adopt the preheating mode of heat accumulator and combustion air direct contact heat transfer, can guarantee the preheating effect to combustion air effectively, reduce equipment cost and area occupied. For the conventional mode that blast air and smoke exhaust go on two nozzles that arrange towards, in this embodiment, blast air and smoke exhaust go on same heat accumulation formula coal injection nozzle, and the coal injection does not switch, and flame lasts stably, can not produce black cigarette, can reduce the number of times of igniteing moreover.

The embodiment of the utility model provides a further following beneficial effect has:

the transition section, the air port and the space outside the air port form a Venturi structure by arranging the transition section in the flow chamber; when the circulating chamber blows air, the combustion-supporting air is compressed at the transition section, the flow speed of the combustion-supporting air blown out from the air port can be obviously increased, the combustion-supporting air blown out from the air port can form turbulent flow, and the entrainment and mixing effects on the pulverized coal are improved.

through stretching out the coal injection rifle outside the casing, on the one hand can increase flame length, makes buggy/flame more deepen to the furnace in, on the other hand can make coal injection mouth keep away from as far as possible as the wind gap of discharging fume to can further prevent that the buggy from being discharged fume and taking away, and because the blast air has higher velocity of flow, consequently do not influence the combustion effect of buggy, can guarantee that buggy fully burns can.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic longitudinal sectional view of a heat accumulating type coal injection burner provided by an embodiment of the present invention;

fig. 2 is a schematic structural view of a heat accumulating type coal injection burner provided by the embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As in fig. 1, the embodiment of the utility model provides a heat accumulation formula coal injection nozzle, include casing 1 and insert and locate coal injection gun 2 on the casing 1, casing 1 has heat-resisting chamber just heat-resisting chamber separates for two circulation rooms, two through partition wall 3 all be equipped with heat accumulator 5 in the circulation room, each circulation room one end is equipped with tuber pipe interface 4 and the other end link up casing 1 forms wind gap 102.

The shell 1 can be the shell 1 of the existing coal injection burner, such as a heat-resistant steel shell 1. The shell 1 has a hollow heat-resistant chamber to facilitate the circulation of the combustion air and is provided with the above-mentioned heat accumulator 5. The coal injection gun 2 may be an existing coal injection gun 2 for a coal injection burner, and a specific structure thereof is not described herein, and an outlet of the coal injection gun 2 is correspondingly formed as a coal injection port.

The partition wall 3 is a heat-resistant partition wall 3, and may be formed by casting a refractory material, for example, a common refractory material such as aluminum silicate. The coal injection lance 2 is preferably inserted into the partition wall 3, so that the partition wall 3 serves to separate the two flow chambers, on the one hand, and to protect the coal injection lance 2 and to improve the heat resistance of the coal injection lance 2, on the other hand.

The heat accumulator 5 may be a honeycomb ceramic heat accumulator 5 or other conventional heat accumulator 5, and the specific structure thereof will not be described herein.

The air duct connector 4 is used for being connected with an air duct and guiding air blowing into a corresponding flow chamber or guiding exhaust smoke out of the corresponding flow chamber. Preferably, a flange connection structure is adopted between the air pipe connector 4 and the air pipe, namely, a connection flange is arranged at the end part of the air pipe connector 4 used for being connected with the air pipe; and the air pipe connector 4 is also preferably arranged on the shell 1 through a flange connection structure, so that the heat accumulating type coal injection burner is convenient to disassemble, assemble and maintain, and can be suitable for air pipes with different pipe diameters, thereby improving the application range of the heat accumulating type coal injection burner.

The heat accumulation formula coal injection nozzle that this embodiment provided, separate 1 heat-resisting chamber of casing for two circulation rooms and set up heat accumulator 5 in two circulation rooms respectively, discharge fume and blast air in turn through two circulation rooms, can make two heat accumulators 5 heat accumulation in turn and preheat combustion air, coal injection burning flue gas that adopts the high temperature preheats combustion air, and adopt the preheating mode of heat accumulator 5 and combustion air direct contact heat transfer, can guarantee the preheating effect to combustion air effectively, reduce equipment cost and area occupied. For the conventional mode that blast air and smoke exhaust go on two nozzles that arrange towards, in this embodiment, blast air and smoke exhaust go on same heat accumulation formula coal injection nozzle, and the coal injection does not switch, and flame lasts stably, can not produce black cigarette, can reduce the number of times of igniteing moreover.

It is easy to understand that the switching between the two circulation chambers for smoke evacuation and air blast is realized by a reversing valve arranged in a rear pipeline, which is a conventional technology in the field of regenerative burners, and the reversing valve also does not belong to one of the components of the regenerative coal injection burner, so the details are not described here.

The structure of the heat accumulating type coal injection burner is further optimized, and as shown in fig. 1 and fig. 2, two air ports 102 are arranged close to the partition wall 3; further preferably, as shown in fig. 1 and 2, the two air ports 102 are symmetrically arranged with respect to the partition wall 3, and the coal injection lance 2 is located at the center of the partition wall 3, so as to ensure the stability of pulverized coal combustion. The flow rate of the blast air blown out from the air port 102 and the flow rate of the pulverized coal sprayed out from the coal injection gun 2 are high, the blast air and the pulverized coal are sucked and mixed, so that the pulverized coal is fully combusted, the formed flame is long, and the pulverized coal cannot be taken away by smoke discharged from the other air port 102.

Further optimizing the structure of the heat accumulating type coal injection burner, as shown in fig. 1, the flow chamber comprises a transition section 101 with gradually changed flow area, and the narrow end of the transition section 101 is communicated with the tuyere 102, that is, the cross-sectional area of the tuyere 102 is the same as the area of the narrow end of the transition section 101. Therefore, the transition section 101, the tuyere 102 and the space outside the tuyere 102 form a venturi structure, and the tuyere 102 corresponds to the throat of the venturi structure; when the circulating chamber blows air, the combustion-supporting air is compressed at the transition section 101, the flow speed of the combustion-supporting air blown out from the air opening 102 can be obviously increased, the combustion-supporting air blown out from the air opening 102 can form turbulent flow, and the entrainment and mixing effects on the pulverized coal are improved.

Further, as shown in fig. 1, the flow chamber further includes a heat exchange section 103 having a constant flow area and communicating with the wide end of the transition section 101, and the heat accumulator 5 is disposed in the heat exchange section 103 to ensure the heat accumulation and preheating effects of the heat accumulator 5.

The casing 1 may be a cylindrical casing 1 or a square casing 1, and in this embodiment, as shown in fig. 1 and fig. 2, the casing 1 is a square casing 1 (a rectangular casing 1), the heat exchange section 103 corresponds to a square space, the transition section 101 corresponds to a trapezoidal space, and the tuyere 102 is preferably a square tuyere 102. The partition wall 3 is preferably a rectangular parallelepiped partition wall 3.

Further preferably, as shown in fig. 1, the head of the coal injection lance 2 protrudes out of the housing 1, and the partition wall 3 correspondingly protrudes out of the housing 1. Through stretching out coal injection lance 2 outside casing 1, can increase flame length on the one hand, make buggy/flame more deepen to the furnace in, on the other hand can make coal injection mouth keep away from as far as possible as the wind gap 102 of discharging fume to can further prevent that the buggy from being discharged fume and taking away, and because the blast air has higher velocity of flow, consequently do not influence the combustion effect of buggy, can guarantee that buggy fully burns can.

Further, as shown in fig. 1, the outer wall of the housing 1 is provided with a mounting flange 6 for facilitating mounting to a corresponding industrial furnace or the like. For the above-described square housing 1 configuration, the mounting flange 6 corresponds to a square flange.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a heat accumulation formula coal injection nozzle, includes the casing and inserts and locates coal injection rifle on the casing, its characterized in that: the casing has heat-resisting chamber just heat-resisting chamber passes through the partition wall and separates for two circulation rooms, two all be equipped with the heat accumulator in the circulation room, each circulation room one end is equipped with the tuber pipe interface and the other end link up the casing forms the wind gap.

2. A regenerative coal injection burner as set forth in claim 1 wherein: the coal injection gun is inserted into the partition wall.

3. A regenerative coal injection burner as set forth in claim 2 wherein: the two air ports are symmetrically arranged relative to the partition wall, and the coal injection gun is positioned in the center of the partition wall.

4. A regenerative coal injection burner as set forth in claim 1 wherein: the flow chamber comprises a transition section with gradually changed flow area, and the narrow end of the transition section is communicated with the air port.

5. A regenerative coal injection burner as set forth in claim 4 wherein: the circulation chamber further comprises a heat exchange section with a constant circulation area and communicated with the wide end of the transition section, and the heat accumulator is arranged in the heat exchange section.

6. A regenerative coal injection burner as set forth in any of claims 1 to 5, wherein: the shell is a square shell.

7. A regenerative coal injection burner as set forth in claim 1 wherein: the partition wall is formed by pouring refractory materials.

8. A regenerative coal injection burner as set forth in claim 1 or 7, wherein: the head of the coal injection gun extends out of the shell, and the partition wall correspondingly protrudes out of the shell.