WO2017175506A1

WO2017175506A1 - Regenerative burner device

Info

Publication number: WO2017175506A1
Application number: PCT/JP2017/006831
Authority: WO
Inventors: 博夫中川; 健介川端; 武史大橋; 山本　俊輔
Original assignee: 中外炉工業株式会社
Priority date: 2016-04-04
Filing date: 2017-02-23
Publication date: 2017-10-12
Also published as: TW201740069A; JP2017187208A; CN108884996A; CN108884996B; JP6571581B2

Abstract

The present invention is a regenerative burner device (10) that recovers the heat of a combustion gas burned in a furnace inside (S) and is provided with heat reservoirs (32, 42) in a burner (1) so as to heat air for combustion, wherein the regenerative burner device (10) is characterized by being provided with the burner (1) for forming a flame, and an air supply and exhaust pipe (2) for supplying air for combustion and for recovering exhaust heat, the burner (1) being provided with: a fuel pipe (12) into which a fuel is introduced; an air pipe (11) into which a primary air to be added to the fuel is introduced; and a main pipe (13) that communicates with the furnace inside (S) so as to enable the fuel from the fuel pipe (12) and the primary air from the air pipe (11) to flow together and inject the fuel into the furnace inside (S), the air pipe (11) being provided with a heating device (111) for heating the primary air.

Description

Regenerative burner equipment

The present invention relates to a regeneration burner device.

Conventionally, in a combustion apparatus such as a heating furnace or a combustion furnace, for the purpose of saving energy, the heat of the combustion gas burned in the furnace is recovered and the regenerator provided with a heat storage body in the burner so as to heat the combustion air. Burner devices are known. As shown in

Patent Documents

1 and 2, in the furnace introduction section, a burner that supplies fuel and air is arranged at the center, and combustion air is supplied around the burner to recover exhaust heat. Some tubes are arranged to form a main flame.

JP 2007-024335 A JP 2010-127525 A

In these examples, since the combustion air of the burner is at room temperature, the flame temperature of the burner of the regeneration burner device is low, the temperature difference between the burner flame and the combustion air heated by the heat storage body is large, and combustion does not occur. There was a problem that the flame of the burner and the combustion air were not mixed well, the mixing was light and dark, and soot and NOx were easily generated in the light and dark part of the mixing.

Therefore, in the present invention, the temperature difference between the burner flame and the combustion air heated by the heat accumulator can be reduced, the combustion between the burner flame and the combustion air can be stabilized, and the generation of soot and NOx can be suppressed. An object is to provide a regenerative burner device.

The present invention
A regeneration burner device that collects heat of combustion gas burned in the furnace and has a heat storage body in the burner so as to heat the combustion air,
A burner that forms a flame,
A supply and exhaust pipe for supplying combustion air and recovering exhaust heat,
The burner joins a fuel pipe into which fuel is introduced, an air pipe into which primary air to be added to the fuel is introduced, and fuel from the fuel pipe and primary air from the air pipe. And a main pipe communicating with the furnace so as to inject fuel into the furnace,
The air pipe is provided with a heating device for heating the primary air.

According to the above configuration, since the primary air is heated by the heating device, the flame temperature of combustion by mixing the primary air and the fuel can be raised, and as a result, the combustion air heated by the heat accumulator A combustion flame can be stably formed by mixing with air. Also, by increasing the combustion flame temperature by mixing the primary air and the fuel, the flow velocity of the mixing of the primary air and the fuel is increased, and the mixing with the combustion air heated by the heat accumulator is reduced. By being promoted, the generation ratio of soot and NOx can be reduced. The fuel may be any gas or oil.

The present invention preferably further comprises the following configuration.
(1) The main pipe includes a first portion where the air pipe merges and a second portion where the fuel pipe merges,
The first part is located upstream of the second part in the flow direction of air and fuel,
The second portion communicates with the furnace.
(2) In the configuration (1), the inner diameter of the first portion is smaller than the inner diameter of the second portion.
(3) In the configuration (1) or (2), the heating device is a pilot burner,
The flame of the pilot burner has a size that does not reach the main pipe,
The axis of the first part and the axis of the second part are located on the same straight line,
A flame monitor is provided at the upstream end of the first portion in the air and fuel flow direction.

According to the configuration (1), the first part is located upstream of the second part in the flow direction of air and fuel, and the second part communicates with the inside of the furnace. The primary air heated by the device can be effectively mixed with the fuel from the fuel tube.

According to the configuration (2), since the inner diameter of the first part is smaller than the inner diameter of the second part, the fuel from the fuel pipe hardly flows back from the second part to the first part in the main pipe. can do.

According to the configuration (3), since the flame of the pilot burner does not reach the main pipe and the first part and the second part are located on the same straight line, the flame monitor located at the upstream end of the first part Thus, it is possible to easily monitor the combustion flame caused by the mixture of the primary air and the fuel.

In short, according to the present invention, the temperature difference between the burner flame and the combustion air heated by the heat accumulator is reduced, the combustion between the burner flame and the combustion air is stabilized, and the generation of soot and NOx is suppressed. A regenerative burner device that can be provided can be provided.

It is a section schematic diagram of a regeneration burner device concerning an embodiment of the present invention. It is the schematic of the regeneration burner apparatus seen from the furnace inner side. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a figure explaining switching of an air exhaust gas switching device. It is a figure explaining switching of an air exhaust gas switching device. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 2.

(overall structure)
FIG. 1 is a schematic cross-sectional view of a regeneration burner device 10 according to an embodiment of the present invention. As shown in FIG. 1, the regeneration burner device 10 includes one burner 1 and a plurality of supply / exhaust pipes 2 arranged around the burner 1. The burner 1 supplies fuel to the furnace interior S, and one end communicates with the furnace interior S. Further, the supply / exhaust pipe 2 is configured to supply combustion air into the furnace S, and one end communicates with the furnace S. In the furnace S, the flame from the burner 1 and the combustion air from the supply / exhaust pipe 2 are mixed to form a main flame.

FIG. 2 is a schematic view of the regenerative burner device viewed from the inside S of the furnace. As shown in FIG. 2, the burner 1 is disposed at the center, and in the present embodiment, the four air supply / exhaust pipes 2 are disposed symmetrically on the concentric circles of the burner 1. FIG. 1 is also a cross-sectional view taken along the line II of FIG.

FIG. 3 is a cross-sectional view taken along the line III-III in FIG. As shown in FIGS. 1 to 3, the air supply / exhaust pipe 2 includes air supply / exhaust pipes 21 to 24, and the air supply / exhaust pipe 21 and the air supply / exhaust pipe 22 are paired on the left and right sides. It communicates with the supply / exhaust chamber 31. A heat storage body 32 is disposed in the supply / exhaust chamber 31. Similarly, the air supply / exhaust pipe 23 and the air supply / exhaust pipe 24 are paired on the left and right sides, and communicate with the common air supply / exhaust chamber 41. A heat storage body 42 is arranged in the supply / exhaust chamber 41.

The supply / exhaust chamber 31 is connected to an air exhaust gas switching device 61 via a pipe 51, and the supply / exhaust chamber 41 is similarly connected to the air exhaust gas switching device 61 via a pipe 52. The air supply / exhaust chamber 31 and the pipe 51 are connected via a flange 33, and the air supply / exhaust chamber 41 and the pipe 52 are connected via a flange 43. The air exhaust gas switching device 61 is connected to the air supply pipe 62 and the exhaust gas discharge pipe 63, and communicates the air supply pipe 62 with the pipe 51 or the pipe 52, and simultaneously communicates the exhaust gas exhaust pipe 63 with the pipe 52 or the pipe 51. The switching valve 61a is provided. The air supply pipe 62 is provided with an air supply blower (not shown) for supplying combustion air, and the exhaust gas discharge pipe 63 is an exhaust fan (not shown) for discharging combustion exhaust gas. ) Is provided.

4 and 5 are diagrams for explaining the switching of the air exhaust gas switching device 61. FIG. In FIG. 4, the switching valve 61 a of the air exhaust gas switching device 61 communicates the air supply pipe 62 and the pipe 51, and communicates the exhaust gas discharge pipe 63 and the pipe 52. As a result, combustion air from the air supply pipe 62 passes through the pipe 51, is heated by the heat storage body 32 in the supply / exhaust chamber 31, and is injected from the supply /

exhaust pipes

21 and 22 into the furnace S. Further, the combustion exhaust gas from the furnace S passes through the supply /

exhaust pipes

23 and 24 by the exhaust fan provided in the exhaust gas discharge pipe 63, and the exhaust heat is recovered by the heat storage body 42 of the supply / exhaust chamber 41. And is discharged from the exhaust gas discharge pipe 63.

On the other hand, in FIG. 5, the switching valve 61 a of the air exhaust gas switching device 61 communicates the air supply pipe 62 and the pipe 52 and communicates the exhaust gas discharge pipe 63 and the pipe 51. As a result, the combustion air from the air supply pipe 62 passes through the pipe 52, is heated by the heat storage body 42 in the supply / exhaust chamber 41, and is injected into the furnace S from the supply /

exhaust pipes

23 and 24. The combustion exhaust gas from the furnace S passes through the air supply /

exhaust pipes

21 and 22 by the exhaust fan provided in the exhaust gas exhaust pipe 63, and the exhaust heat is recovered by the heat storage body 32 in the air supply / exhaust chamber 31. And is discharged from the exhaust gas discharge pipe 63.

As described above, the combustion air is supplied between the supply /

exhaust pipes

21 and 22 and the supply /

exhaust pipes

23 and 24 by switching the switching valve 61a of the air exhaust gas switching device 61 between FIG. 4 and FIG. And the recovery of the combustion exhaust gas are alternately repeated, and the heat of the combustion exhaust gas combusted in the furnace S is recovered by the

heat storage bodies

32 and 42, and the combustion air is heated by the heat recovered by the

heat storage bodies

32 and 42. It can be done.

FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. As shown in FIG. 6, the burner 1 includes an air pipe 11 into which primary air to be added to fuel is introduced, a fuel pipe 12 into which fuel is introduced, and fuel and air pipes from the fuel pipe 12. And a main pipe 13 communicating with the inside of the furnace S so that the primary air from 11 joins and injects a flame into the inside of the furnace S. The burner 1 is appropriately provided with ignition means such as a spark plug (not shown) in order to ignite a flame.

The main pipe 13 includes a first part 131 where the air pipe 11 merges and a second part 132 where the fuel pipe 12 merges. The first part 131 is air and fuel with respect to the second part 132. It is located upstream in the flow direction. The first portion 131 and the second portion 132 are integrally formed, and the first portion 131 and the second portion 132 are arranged so that the axis of the first portion 131 and the axis of the second portion 132 coincide with each other. It extends on the same straight line. The inner diameter of the first portion 131 is smaller than the inner diameter of the second portion 132, and a step 13 a is formed at the connecting portion between the first portion 131 and the second portion 132.

The air pipe 11 merges so as to have an angle θ1 of 90 degrees or less with respect to the first portion 131 of the main pipe 13, and the fuel pipe 12 has an angle of 90 degrees or less with respect to the second portion 132 of the main pipe 13. They merge so as to have θ2. An angle θ1 formed by the air tube 11 and the first portion 131 is the same as or smaller than an angle θ2 formed by the fuel tube 12 and the second portion 132.

The air pipe 11 includes a downstream portion 11a that merges with the first portion 131 of the main pipe 13, and an upstream portion 11b that is located upstream of the downstream portion 11a in the air flow direction and into which primary air is introduced. Yes. As described above, the downstream portion 11a merges with the first portion 131 so as to have an angle θ1 of 90 degrees or less, and the downstream portion 11a and the upstream portion 11b have an angle θ3 of approximately 90 degrees. ing. That is, a bent portion 11c that bends approximately 90 degrees is formed between the downstream portion 11a and the upstream portion 11b. In addition, the downstream part 11a, the upstream part 11b, and the bending part 11c are integrally formed.

A pilot burner 111 which is a heating device for heating the primary air is provided in the bent portion 11c of the air pipe 11. The pilot burner 111 is attached to the bent portion 11c so as to extend along the downstream portion 11a so that the flame direction of the pilot burner 111 is parallel to the downstream portion 11a. The primary air introduction position into the air pipe 11 is on the upstream side in the air flow direction from the mounting position of the pilot burner 111. In addition, in order to ignite the pilot burner 111 in the air pipe 11, ignition means such as a spark plug (not shown), and a flame monitor (not shown) for monitoring the flame of the pilot burner 111 as appropriate. Is provided.

The flame of the pilot burner 111 is formed so as to extend along the downstream portion 11 a and has a size that does not reach the main pipe 13. At the upstream end of the first portion 131 of the main pipe 13 in the air and fuel flow direction, a flame monitor 14 for monitoring the state of the flame formed in the main pipe 13 and the furnace S is provided. Further, the main body 111a of the pilot burner 111 may be one that forms a flame by injecting only fuel and mixing it with the air in the air pipe 11, or one that injects fuel and air to form a flame.

The regenerative burner device 10 having the above-described configuration can exhibit the following effects.

(1) Since the primary air is heated by the pilot burner 111, the flame temperature of the combustion by mixing the primary air and the fuel can be raised, and as a result, the combustion heated by the

heat storage bodies

32 and 42 The flame of combustion by mixing with the working air can be formed stably. Further, by increasing the flame temperature of the combustion by mixing the primary air and the fuel, the flow velocity of mixing the primary air and the fuel increases, and the combustion air heated by the

heat accumulators

32 and 42 By promoting the mixing, the generation ratio of soot and NOx can be reduced.

(2) The first portion 131 is located upstream of the second portion 132 in the flow direction of air and fuel, and the second portion 132 communicates with the inside of the furnace S, so the pilot burner 111 Thus, the primary air heated by the fuel can be effectively mixed with the fuel from the fuel pipe 12.

(3) The inner diameter of the first portion 131 is smaller than the inner diameter of the second portion 132, and a step 13 a is formed at the connecting portion between the first portion 131 and the second portion 132. It is possible to make it difficult for the fuel from the pipe 12 to flow backward from the second portion 132 to the first portion 131 in the main pipe 13.

(4) Since the tip of the flame of the pilot burner 111 does not reach the main pipe 13 and the first portion 131 and the second portion 132 are located on the same straight line as indicated by X in the figure, the pilot burner The flame of combustion due to the mixture of primary air and fuel can be easily monitored by the flame monitor 14 located at the upstream end of the first portion 131 without erroneously detecting 111 flames.

(5) Since the air pipe 11 merges with the first portion 131 of the main pipe 13 so as to have an angle θ1 of 90 degrees or less, the primary air from the air pipe 11 becomes the air in the main pipe 13 and The fuel can flow smoothly along the fuel flow direction.

(6) Since the fuel pipe 12 merges with the second portion 132 of the main pipe 13 so as to have an angle θ2 of 90 degrees or less, the fuel from the fuel pipe 12 flows in the air and the fuel in the main pipe 13. It can be made to flow smoothly along the direction.

(7) The angle θ1 formed between the air pipe 11 and the first portion 131 is the same as or smaller than the angle θ2 formed between the fuel pipe 12 and the second portion 132. The primary air and the fuel from the fuel pipe 12 can be more easily mixed.

(8) The air supply /

exhaust pipes

21 and 22 are a pair of left and right, and communicate with the common air supply / exhaust chamber 31, and the air supply /

exhaust pipes

23 and 24 are a pair of left and right and the common air supply / exhaust chamber 41, the single air exhaust gas switching device 61 can switch the supply of combustion air and the recovery of the combustion exhaust gas.

(9) Since the supply / exhaust pipes 21 to 24 are symmetrically arranged on the concentric circles of the burner 1, the supply of combustion air from the supply / exhaust pipes 21 to 24 and the recovery of the combustion exhaust gas can be performed. In the furnace S, the combustion state around the burner 1 can be further stabilized.

In the above embodiment, the heating device for heating the primary air is the pilot burner 111, but the heating device of the present invention is not limited to the pilot burner, and may be any heating device that can heat the primary air. An electric heater or a heat exchanger may be used.

In the above embodiment, the regenerative burner device 10 is a self-regenerative burner device in which one burner device includes a plurality of supply / exhaust pipes 21 to 24 and alternately repeats supply / exhaust between the plurality of supply / exhaust pipes 21-24. However, the present invention is not limited to a self-regenerative burner device, and includes a pair of opposed burner devices, and when one burner device forms a flame, the other burner device collects combustion exhaust gas and stores heat. It can also be applied to a regeneration burner that recovers heat from the body.

In the above embodiment, the regenerative burner apparatus 10 includes one burner 1 and four supply / exhaust pipes 21 to 24. However, when the regenerative burner apparatus is a self-regenerative burner apparatus, the number of supply / exhaust pipes May be an even number of 2 or more. When the regenerative burner device is not a self-regenerative burner device, the number of supply / exhaust pipes does not have to be an even number and may be one or more.

In the above embodiment, the air supply / exhaust pipes 21 to 24 are arranged on the concentric circles of the burner 1 so as to be symmetrical, but may be arranged asymmetrically with respect to the burner 1.

In the above embodiment, the air supply /

exhaust pipes

21, 22 are a pair of left and right, a common heat storage body 32 is provided, the air supply /

exhaust pipes

23, 24 are a pair of left and right, and the common heat storage body 42 is Although provided, an individual heat storage body may be provided for each supply / exhaust pipe.

Various modifications and changes can be made without departing from the spirit and scope of the present invention as set forth in the appended claims.

In the present invention, the present invention reduces the temperature difference between the burner flame and the combustion air heated by the heat accumulator, stabilizes the combustion of the burner flame and the combustion air, and reduces the generation of soot and NOx. Since the regenerative burner device that can be suppressed can be provided, the industrial utility value is great.

1 Burner
11 Air pipe
11a Downstream part 11b Upstream part 11c Bending part
111 Pilot burner 111a Pilot burner body
12 Fuel pipe
13 Supervision
131 1st part 132 2nd part
13a step
14 Flame monitor
2 Supply / exhaust pipe
21 Supply / Exhaust Pipe 22 Supply / Exhaust Pipe 23 Supply / Exhaust Pipe 24 Supply / Exhaust Pipe
31 Supply / exhaust chamber 32 Heat storage body 33 Flange
41 Supply / exhaust chamber 42 Heat storage body 43 Flange
51 Piping 52 Piping
61 Air exhaust gas switching device 61a Switching valve
62 Air supply pipe 63 Exhaust gas discharge pipe
10 Regenerative burner equipment
S Furnace
θ1-θ3 angle

Claims

A regeneration burner device that collects heat of combustion gas burned in the furnace and has a heat storage body in the burner so as to heat the combustion air,
A burner that forms a flame,
A supply and exhaust pipe for supplying combustion air and recovering exhaust heat,
The burner joins a fuel pipe into which fuel is introduced, an air pipe into which primary air to be added to the fuel is introduced, and fuel from the fuel pipe and primary air from the air pipe. And a main pipe communicating with the furnace so as to inject fuel into the furnace,
The regenerative burner device, wherein the air pipe is provided with a heating device for heating the primary air.
The main pipe includes a first portion where the air pipe merges and a second portion where the fuel pipe merges,
The first part is located upstream of the second part in the flow direction of air and fuel,
The regeneration burner device according to claim 1, wherein the second portion communicates with the inside of the furnace.
The regeneration burner device according to claim 2, wherein an inner diameter of the first portion is smaller than an inner diameter of the second portion.
The heating device is a pilot burner;
The flame of the pilot burner has a size that does not reach the main pipe,
The axis of the first part and the axis of the second part are located on the same straight line,
The regenerative burner device according to claim 2 or 3, wherein a flame monitor is provided at an upstream end of the first portion in the flow direction of air and fuel.