JPH10185127A - Premixed short flame burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to widen turn down and ignition range with compact and simple construction. SOLUTION: A fuel supply pipe 4 is set up at the central side of an outer cylindrical body 1 while a cup 5, which is opened on the downstream side, is provided on the outer periphery on the tip side of the fuel supply pipe. A proper number of air holes 6 are provided on the upstream side of the cup 5 while a proper number of gas holes 7 are provided on the tip side of the fuel supply pipe so that a slowing apparatus 8 is set up between the cup and the outside cylindrical body. Thus construction makes it possible to set up a spark rod 10 or a flame rod in the cup by way of an air hole in the cup 5 and monitor the flames with an ultra vision by way of the air hole. It is also possible to contrive further shorter flames by providing an air mixing hole 9 on the fuel supply pipe in a burner wind box.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a premixed short flame burner.

[0002]

2. Description of the Related Art As one of the conventional methods for measuring the shortening of flame by using a premix burner, there is a method of imparting swirling to air and / or gas by a structure as shown in FIG. 3, for example. To achieve high-load, short-flame combustion by achieving flame holding and rapid mixing.

[0003]

However, conventionally, a very short flame (for example, 1,000,000 kcal / h (1162
(The flame length at kW) is less than 1 m. For example, as shown in FIG. 3, in many cases, a mechanism such as an air rectifying plate is provided to rectify a combustion aid (air or the like) in a burner-like box, so that the burner main body is large. Further, in the conventional so-called premixed short flame burner, the structure of the burner is complicated and large, and the number of extremely short flames is small. As described above, it was difficult to form an extremely short flame with the premix burner, so that the load on the combustion chamber could not be increased, and it was difficult to make the furnace body more compact than ever. In addition, there are few conventional premix burners for shortening the flame, which can take a wide range of turndown and ignition. An object of the present invention is to solve such a problem.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a fuel supply pipe is provided on the center side of an outer cylindrical body, and the fuel supply pipe is opened downstream on the outer periphery of the tip side of the fuel supply pipe. A premixing configuration in which a cup is provided, an appropriate number of air holes are provided upstream of the cup, an appropriate number of gas holes are provided at the tip side of the fuel supply pipe, and an air swirler is installed between the cup and the outer cylinder. Suggest a short flame burner.

[0005] Next, in the present invention, it is proposed that the fuel supply pipe be provided with an air mixing hole on the upstream side of the location where the cup is installed.

Next, the present invention proposes a configuration in which the spark rod is positioned in the cup from the upstream side of the burner through the air hole in the above configuration.

Next, the present invention proposes a configuration in which the frame rod is positioned in the cup from the upstream side of the burner through the air hole in the above configuration.

Next, the present invention proposes that the monitoring direction of the ultravision installed on the upstream side of the burner be set to the air hole of the cup in the above configuration.

Next, in the present invention, it is proposed that the air swirler is installed without a gap between the cup and the outer cylindrical body in the above configuration.

Next, in the present invention, it is proposed that the air swirler is installed with a slight gap between the cup and the outer cylinder in the above configuration. Further, in this configuration, it is proposed that the monitoring direction of the ultravision installed on the upstream side of the burner is set to a gap between the air swirler and the cup or the outer cylinder.

According to the present invention, in the cup, the fuel flowing through the gas holes and the air flowing through the air holes mix to form a stable pilot flame. On the other hand, the air swirler also functions as a flame holding plate and improves the fixing of the flame. For this reason, in the downstream area of the air swirler, the fuel jetted from the tip of the fuel supply pipe and the swirling flow of air are mixed well in a short time, and the flame is well maintained by the pilot flame, so that an extremely short flame is stably formed. Is done.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 shows the basic configuration of a premixed short flame burner according to the present invention, wherein reference numeral 1 denotes an outer cylinder, and a lid 2 is provided in an axial direction on the upstream side of the outer cylinder 1, and a lateral direction is provided. Constitutes the air supply port 3. A fuel supply pipe 4 is provided on the center side of the outer cylindrical body 1, and a cup 5 opened on the downstream side is provided on the outer periphery of the fuel supply pipe 4 on the tip side. The cup 5 has an appropriate number of air holes 6 on the upstream side and an appropriate number of gas holes 7 on the tip side of the fuel supply pipe 4. An air swirler 8 is provided between the cup 5 and the outer cylinder 1. The air swirler 8 can be installed with no gap between the cup 5 and the outer cylinder 1, or can be installed with a slight gap on the cup 5 side or the outer cylinder 1 side.

In the above configuration, the air supplied from the air supply port 3 into the outer cylinder 1 is swirled by the air swirler 8 and ejected to the downstream combustion zone, and a part of the air is injected from the air hole 6. It flows into the cup 5. On the other hand, the fuel gas flows through the fuel supply pipe 4 and is ejected from the tip to the downstream combustion zone,
It mixes rapidly with the swirling flow of air, and some
Flows into the cup 5.

Therefore, in the cup 5, the fuel gas flowing through the gas holes 7 and the air flowing through the air holes 6 are mixed to form a stable pilot flame.

On the other hand, since the air swirler 8 also functions as a flame holding plate, the fixing of the flame is good, and the swirling flow of the fuel and air ejected from the tip of the fuel supply pipe 4 in the downstream combustion zone. Are mixed well in a short period of time and are well held by the pilot flame, so that an extremely short flame is stably formed. In addition, the turndown ratio is large due to good flame holding by the pilot flame.

FIG. 2 shows the configuration of a premixed short flame burner in which various components are added to the basic configuration of FIG. In this figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. First, reference numeral 9 denotes an air mixing hole provided in the burner wind box on the fuel supply pipe 4 on the upstream side of the location where the cup 5 is installed. In this configuration, a part of the air flows into the fuel supply pipe 4 through the air mixing hole 9 and mixes with the fuel, so that the fuel and the air are mixed more rapidly in the combustion region, and the flame is further shortened. Can be measured.

Reference numeral 10 denotes a spark rod supported on the lid 2 on the upstream side of the burner and positioned in the cup 5 through the air hole 6 through the wind box. In this configuration, since the mixture in the cup can be ignited by the spark rod 10,
The ignition range can be particularly widened.

Reference numeral 11 denotes a flame monitoring ultravision supported on the lid 2 on the upstream side of the burner. The ultravision 11 is provided in the cup 5 when the monitoring direction is directed to the air hole 6 of the cup 5. Pilot flames can be detected through the air holes 6, and thus flame monitoring can be performed.

The flame is monitored by a frame rod supported by the lid 2 on the upstream side of the burner and positioned in the cup 5 through the air hole 6 through the wind box, although illustration is omitted in place of the ultravision 11. Can also be performed.

When the air swirler 8 is installed with a slight gap between the cup 5 and the outer cylinder 1, the monitoring direction of the ultravision 11 is directed to the gap to monitor the flame. It can be performed.

The basic configuration shown in FIG. 1 is constructed by adding the above-described components as shown in FIG. 2, and an appropriate single or plural components may be added to the basic configuration. it can.

[0022]

As described above, the present invention has the following effects. a. A very short flame can be formed with the premix burner, and the structure is simple and compact. b. For this reason, the combustion chamber load can be increased and the furnace body can be made compact. c. For this reason, the initial cost of a burner and a furnace body can be reduced. d. This is advantageous for heating at a high temperature, and is particularly advantageous when performing local heating because a high-temperature flame is easily obtained. e. The turndown ratio is large. f. In the configuration in which the spark rod is located in the cup from the air hole, the ignition range can be particularly widened.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a basic configuration of a premixed short flame burner to which the present invention is applied.

FIG. 2 is a longitudinal sectional view showing another configuration of a premixed short flame burner to which the present invention is applied.

FIG. 3 is a longitudinal sectional view showing an example of a conventional premix burner for shortening flame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Lid 3 Air supply port 4 Fuel supply pipe 5 Cup 6 Air hole 7 Gas hole 8 Air swirler 9 Air mixing hole 10 Spark rod 11 Ultravision

Claims (8)

[Claims] 1. A fuel supply pipe is provided at a center side of an outer cylindrical body, a cup opened downstream is provided on an outer periphery of a tip side of the fuel supply pipe, and an appropriate number of air holes are provided upstream of the cup. At the same time, an appropriate number of gas holes are provided on the tip side of the fuel supply pipe,
A premixed short flame burner characterized by installing an air swirler between the cup and the outer cylinder. 2. The premixed short flame burner according to claim 1, wherein an air mixing hole is provided in the fuel supply pipe upstream of a location where the cup is installed. 3. The premixed short flame burner according to claim 1, wherein the spark rod is positioned in the cup from the upstream side of the burner through an air hole. 4. The premixed short flame burner according to claim 1, wherein the flame rod is located in the cup from the upstream side of the burner through an air hole. 5. The premixed short flame burner according to claim 1, wherein the monitoring direction of the ultravision installed upstream of the burner is set to the air hole of the cup. 6. The premixed short flame burner according to claim 1, wherein the air swirler is installed without a gap between the cup and the outer cylinder. 7. The premixed short flame burner according to claim 1, wherein the air swirler is installed with a slight gap between the cup and the outer cylinder. 8. The premixed short flame burner according to claim 7, wherein the monitoring direction of the ultravision installed upstream of the burner is set in a gap between the air swirler and the cup or the outer cylinder.