JP2015197284A - combustion device for heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion device for heating furnace capable of making a shape of flame formed at the front side of a burner body into a proper shape while increasing an amount of blowout of combustion air ejected from an opposing air blowout part more than that of combustion air ejected from the burner body.SOLUTION: There are provided: a burner body B comprising a combustible gas ejection part 17 for ejecting combustible gas into a combustion space N and an outer circumferential side combustion air ejection part 16 for ejecting combustion air into the combustion space N at the outer circumferential side of the ejected combustible gas; an opposing air ejection part; and an internal combustion air ejection part 18 for ejecting combustion air at a faster ejection speed than that of the combustible gas toward the opposing air ejection part in an ejection flow of the combustible gas ejected from the combustible gas ejection part 17. An ejection amount of combustion air ejected from the opposing air ejection part increases more than that of combustion air ejected from the burner body B.

Description

The present invention is a combustion space partitioned into a cylindrical shape in a state in which intrusion of air from the outside is prevented,
A combustible gas ejection portion that ejects combustible gas into the combustion space, and an outer combustion air ejection portion that ejects combustion air into the combustion space on the outer peripheral side of the combustible gas ejected from the combustible gas ejection portion A burner body with
The combustion is disposed in a state of being positioned so as to be separated from the burner body along the direction in which the combustible gas and combustion air from the burner body are ejected and to sandwich the combustion space between the burner body and the burner body. The present invention relates to a combustion apparatus for a heating furnace provided with a counter air ejection portion that ejects combustion air into a space.

  Such a combustion apparatus for a heating furnace uses a combustible gas ejected from a combustible gas ejection section of a burner body, and a combustion air ejected from an outer air combustion section and an opposed air ejection section. It is intended to be burned by air, and since the direction of combustion of the combustible gas ejected from the combustible gas ejection section and the direction of ejection of the combustion air ejected from the opposing ejection section are opposed to each other, It can burn well while promoting the mixing of the combustible gas and the combustion air (see, for example, Patent Document 1 (see paragraphs [0002] to [0004], FIG. 4)).

  In addition, in patent document 1, although there is no description about the specific structure of the burner as a burner main body, it is described that combustion gas is jetted downward from a burner, and when considering the description of FIG. The burner as the burner body can be considered to include a combustible gas ejection part and an outer peripheral combustion air ejection part.

Incidentally, such a combustion apparatus for a heating furnace is used for heat treatment of an object to be treated such as firing raw stone as an object to be treated, as described in Patent Document 1, for example. As described in Patent Document 1, the burner body is often arranged on the upper side of the combustion space, and the opposed air ejection portion is often arranged on the lower side of the combustion space. .

  In addition, in the combustion apparatus for a heating furnace of Patent Document 1, it is described that LPG is used as a flammable gas, and an injector nozzle as an opposed air ejection portion ejects air through the inside of the diffuser, Combustion gas is circulated.

Japanese Patent Laid-Open No. 11-263644

  In a combustion apparatus for a heating furnace, for the purpose of promoting the mixing of the combustible gas and the combustion air, the amount of combustion air ejected from the opposed air ejection section is the amount of combustion air ejected from the burner body. There may be a case where it is desired to configure to be larger than the ejection amount.

  However, if the amount of combustion air ejected from the opposed air ejection portion is larger than the amount of combustion air ejected from the burner body, the combustion air ejected from the opposed air ejection portion will cause The shape of the flame formed on the front side tends to be a laterally spread shape, and in some cases, in addition to the lateral spread, the flame tip is turned back to the burner body side. Sometimes the shape is raised.

  And, in this way, when the shape of the flame formed on the front side of the burner main body becomes a shape that spreads horizontally, or when it is a raised shape, the inconvenience of burning the wall portion where the burner main body is installed, Since there is a risk of inconvenience that the combustion space cannot be heated properly, it is difficult to increase the amount of combustion air ejected from the opposed air ejection section to the amount of combustion air ejected from the burner body. there were.

  By the way, in the case of providing a liquid fuel ejection part that ejects liquid fuel such as heavy oil in place of the combustible gas ejection part, the amount of combustion air ejected from the opposed air ejection part because the specific gravity of the liquid fuel is large However, the flame shape formed on the front side of the burner body becomes an appropriate shape extending toward the opposed air ejection section. However, since the specific gravity of the combustible gas is light, the shape of the flame formed on the front portion side of the burner main body may be a horizontally spread shape or a raised shape.

  The present invention has been made in view of the above circumstances, and the purpose thereof is to increase the amount of combustion air ejected from the opposed air ejection portion more than the amount of combustion air ejected from the burner body. However, it is in the point which provides the combustion apparatus for heating furnaces which can make the shape of the flame formed in the front side of a burner main body into an appropriate shape.

The combustion apparatus for a heating furnace of the present invention has a combustion space partitioned into a cylindrical shape in a state in which intrusion of air from the outside is prevented,
A combustible gas ejection portion that ejects combustible gas into the combustion space, and an outer combustion air ejection portion that ejects combustion air into the combustion space on the outer peripheral side of the combustible gas ejected from the combustible gas ejection portion A burner body with
The combustion is disposed in a state of being positioned so as to be separated from the burner body along the direction in which the combustible gas and combustion air from the burner body are ejected and to sandwich the combustion space between the burner body and the burner body. An opposed air jetting part for jetting combustion air in the space is provided, and the first characteristic configuration is
An internal combustion air ejection section that ejects combustion air at a faster ejection speed than the combustible gas toward the opposed air ejection section in the flow of combustible gas ejected from the combustible gas ejection section, Provided in the burner body in a state located inward of the combustible gas ejection portion,
The present invention is characterized in that the amount of combustion air ejected from the opposed air ejection portion is configured to be larger than the amount of combustion air ejected from the burner body.

  That is, the internal combustion air ejecting section ejects combustion air at a faster ejection speed than the combustible gas toward the opposed air ejecting section in the combustible gas ejecting flow ejected from the combustible gas ejecting section. Therefore, the combustible gas ejected from the combustible gas ejection section flows with the combustion air while being caught in the flow of combustion air ejected from the internal combustion air ejection section.

  Therefore, even if the amount of combustion air ejected from the opposed air ejection portion is larger than the amount of combustion air ejected from the burner body, the combustible gas ejected from the combustible gas ejection portion is With the combustion air ejected from the combustion air ejection part, it becomes a state that flows toward the opposed air ejection part, and the shape of the flame formed on the front side of the burner body is an appropriate shape that extends toward the opposed air ejection part It becomes.

  In other words, for the purpose of promoting the mixing of the combustible gas and the combustion air, the amount of combustion air ejected from the opposed air ejection section is made larger than the amount of combustion air ejected from the burner body. However, the shape of the flame formed on the front side of the burner main body can be made an appropriate shape extending toward the opposed air ejection portion.

  And, since the shape of the flame formed on the front side of the burner body is an appropriate shape that extends toward the opposed air ejection part, the wall part where the burner body is installed is burned out. Thus, the combustion space can be appropriately heated while avoiding the occurrence of inconvenience.

  In short, according to the first characteristic configuration of the present invention, the amount of combustion air ejected from the opposed air ejection portion is larger than the amount of combustion air ejected from the burner body, but the front of the burner body. A combustion apparatus for a heating furnace that can make the shape of the flame formed on the side an appropriate shape can be provided.

In addition to the first characteristic configuration described above, the second characteristic configuration of the combustion apparatus for a heating furnace of the present invention includes:
The internal combustion air ejection part is configured to eject compressed air as combustion air,
A jet compressed air amount adjusting means for adjusting the amount of compressed air jetted from the internal combustion air jet section, and a jet combustion air quantity adjusting means for adjusting the quantity of combustion air jetted from the outer peripheral combustion air jet section It is characterized in that is provided.

  That is, since the internal combustion air ejection part is configured to eject compressed air as combustion air, the combustion air ejection speed from the internal combustion air ejection part is set to the combustible gas ejection part. The shape of the flame formed on the front side of the burner body even when the jetting speed of the combustion air jetted from the opposed air jetting part is fast enough than the jetting speed of the combustible gas Can be made into an appropriate shape extending toward the opposed air ejection portion.

  Moreover, a jet compressed air amount adjusting means for adjusting the amount of compressed air ejected from the internal combustion air ejecting portion, and a jet combustion air amount adjusting means for adjusting the amount of combustion air ejected from the outer peripheral combustion air ejecting portion. Therefore, the amount of compressed air ejected from the internal combustion air ejecting portion and the combustion ejected from the outer combustion air ejecting portion with the same amount of combustion air ejecting from the burner body The ratio with the amount of air can be changed.

  Therefore, by changing the ratio of the amount of compressed air ejected from the internal combustion air ejection section and the amount of combustion air ejected from the outer combustion air ejection section according to the installation conditions and usage conditions, etc. Regardless of changes in conditions, use conditions, etc., the shape of the flame formed on the front side of the burner body can be made an appropriate shape extending toward the opposed air ejection portion.

  In short, according to the second characteristic configuration of the present invention, in addition to the function and effect of the first characteristic configuration, the front side of the burner main body can be used even when the jet speed of the combustion air jetted from the opposed air jet section is high. The shape of the flame formed on the burner body can be an appropriate shape extending toward the opposed air ejection part, and is formed on the front side of the burner body regardless of changes in installation conditions, usage conditions, etc. It is possible to provide a combustion apparatus for a heating furnace that can make the flame shape into an appropriate shape that extends toward the opposed air ejection portion.

In addition to the first or second characteristic configuration described above, the third characteristic configuration of the combustion apparatus for a heating furnace of the present invention includes:
The jet central axis of the opposed air jet part is aligned with the space central axis of the combustion space, and the central axes of the internal combustion air jet part, the combustible gas jet part, and the outer peripheral combustion air jet part are Matched to the space center axis of the combustion space,
The opposed air ejection part and the internal combustion air ejection part are provided opposite to each other with the same axial center.

  In other words, since the opposed opposed air ejection part and the internal combustion air ejection part have the same axial center, the flow of combustion air ejected from the opposed air ejection part and the ejection from the internal combustion air ejection part Therefore, the flow of combustion air ejected from the opposed air ejection part will affect the flow of combustible gas ejected from the combustible gas ejection part. Can be appropriately suppressed.

  In this way, since the flow of the combustion air ejected from the opposed air ejection section can appropriately suppress the influence of the flow of the combustible gas ejected from the combustible gas ejection section, the combustible gas ejection section The shape of the flame formed on the front side of the burner body can stabilize the state in which the combustible gas ejected from the air flows toward the opposed air ejection part together with the combustion air ejected from the internal combustion air ejection part Can be further stabilized.

  In short, according to the third characteristic configuration of the present invention, in addition to the operational effects of the first or second characteristic configuration, it is possible to further stabilize the shape of the flame formed on the front side of the burner body. A combustion apparatus for a heating furnace can be provided.

In addition to any of the first to third characteristic configurations described above, the fourth characteristic configuration of the combustion apparatus for a heating furnace according to the present invention includes:
The sum of the amount of combustion air ejected from the outer peripheral combustion air ejecting portion and the internal combustion air ejecting portion and the amount of combustion air ejected from the opposed air ejecting portion is the combustible gas. It is characterized in that it is between 1 and 4 times the theoretical combustion air amount of the combustible gas ejected from the ejection part.

  That is, the combustion air 1 to 1.1 times the theoretical combustion air amount of the combustible gas ejected from the combustible gas ejection section is the outer combustion air ejection section, the internal combustion air ejection section, and the opposite A large amount of carbon dioxide is produced while suppressing the generation of unburned components such as carbon monoxide by completely burning the combustible gas ejected from the combustible gas ejection unit as much as possible because it is supplied from the air ejection unit. Therefore, the treatment for the combustion exhaust gas can be facilitated.

  In other words, if the combustible gas does not burn completely, the combustion exhaust gas contains a large amount of unburned components such as carbon monoxide. According to the fourth feature configuration, the combustible gas can be burnt completely as much as possible, and a large amount of carbon dioxide can be generated while suppressing the generation of unburned components such as carbon monoxide. Therefore, it is possible to facilitate the processing.

  In short, according to the fourth characteristic configuration of the present invention, in addition to the operational effects of the first to third characteristic configurations, it is possible to provide a combustion apparatus for a heating furnace capable of facilitating treatment of combustion exhaust gas.

In addition to the fourth characteristic configuration described above, the fifth characteristic configuration of the combustion apparatus for a heating furnace of the present invention includes:
The amount of combustion air ejected from the opposed air ejection section is 70% or more of the sum.

  That is, combustion of 70% or more of the sum of the amount of combustion air ejected from the outer combustion air ejecting portion and the internal combustion air ejecting portion and the amount of combustion air ejected from the opposed air ejecting portion Since the working air is ejected from the opposed air ejection section, the mixing of the combustible gas and the combustion air can be promoted.

  That is, it is possible to promote mixing of the combustible gas and the combustion air while colliding the combustible gas ejected from the combustible gas ejection portion and a large amount of the combustion air ejected from the opposed air ejection portion. The combustible gas can be burned completely as much as possible.

  If it adds explanation, this 5th characteristic structure will quote the said 4th characteristic structure, and is 1 to 4 times the theoretical combustion air quantity of the combustible gas injected from a combustible gas injection part. Incombustible gas is burned at, so if the combustion air is not sufficiently excessive, incomplete combustion is likely to occur, but mixing of the combustible gas and the combustion air is promoted. Even when the combustion air is not sufficiently excessive, the combustible gas can be burned completely as much as possible.

  In short, according to the fifth characteristic configuration of the present invention, in addition to the operational effects of the fourth characteristic configuration, it is possible to provide a combustion apparatus for a heating furnace capable of completely burning combustible gas as much as possible.

In addition to any of the first to fifth characteristic configurations described above, the sixth characteristic configuration of the combustion apparatus for a heating furnace of the present invention includes:
The burner main body is disposed on the upper side of the combustion space, and the opposed air ejection part is disposed on the lower side of the combustion space.

  That is, the burner main body is disposed on the upper side of the combustion space, and the combustible gas is ejected downward from the combustible gas ejection portion. The gas can be caused to flow downward toward the opposed air ejection portion disposed on the lower side of the combustion space.

  In this way, the combustible gas ejected downward from the combustible gas ejection portion is directed downward toward the opposed air ejection portion disposed on the lower side of the combustion space while utilizing its weight. Since it can be made to flow, the flame of the state extended below can be produced | generated as appropriate in the front side location of a burner main body.

  In short, according to the sixth characteristic configuration of the present invention, it is possible to provide a combustion apparatus for a heating furnace that can appropriately generate a flame in a state of extending downward on the front side portion of the burner body.

In addition to any of the first to sixth feature configurations described above, the seventh feature configuration of the combustion apparatus for a heating furnace of the present invention includes:
The combustion space is characterized in that it is a heat treatment space for an object to be processed put into the combustion space.

That is, the processing object is put into the combustion space, and heat treatment such as firing of the processing object is performed.
As described above in the column of the first characteristic configuration, the combustion space is appropriately heated by a flame having an appropriate shape formed on the front side of the burner body. Can be performed satisfactorily.

  In short, according to the seventh characteristic configuration of the present invention, it is possible to provide a combustion apparatus for a heating furnace that can satisfactorily heat-treat the object to be processed.

In addition to any of the first to seventh characteristic configurations described above, the eighth characteristic configuration of the heating furnace combustion apparatus of the present invention is:
The combustible gas ejected from the combustible gas ejecting portion is configured such that a combustible gas having a lighter specific gravity than air can be used as fuel.

That is, as the combustible gas, a combustible gas having a lighter specific gravity than air, such as city gas, can be burned well in the combustion space.
That is, as described above in the column of the first characteristic configuration, the combustible gas ejected from the combustible gas ejecting section is caught in the flow of combustion air ejected from the internal combustion air ejecting section. Even if a combustible gas with a specific gravity lighter than air, such as city gas, is used as the flammable gas, the shape of the flame formed on the front side of the burner body is directed toward the opposed air ejection part. It becomes an appropriate shape that stretches.

  Therefore, even if a combustible gas having a lighter specific gravity than air, such as city gas mainly composed of methane, is used as the combustible gas, the shape of the flame formed on the front side of the burner body is Thus, the combustion space can be appropriately heated in a state where it has an appropriate shape extending toward the side and avoids the inconvenience of burning out the wall portion on which the burner body is installed.

  In short, according to the eighth characteristic configuration of the present invention, even when a combustible gas having a specific gravity lighter than air is used as the combustible gas, the occurrence of inconvenience of burning out the wall portion where the burner body is installed is avoided. In this state, it is possible to provide a combustion apparatus for a heating furnace that can appropriately heat the combustion space.

Vertical section of the heating furnace Vertical side view of burner body III-III sectional view of FIG. Vertical section of another embodiment

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Overall structure of heating furnace)
As shown in FIG. 1, the illustrated heating furnace is configured in a vertical shape including a lid 2 at an upper portion of a vertically-oriented cylindrical furnace body 1, and has a granular shape supplied from a raw material tank 3. The raw stone is heat-treated as an object to be processed and fired, and the fired processed material is intermittently discharged from a discharge portion D provided at the bottom of the furnace body 1.

The furnace body 1 is provided so as to be rotationally driven around a rotation axis X along the vertical direction that matches the furnace body center axis, and the lid body 2 and the discharge part D are provided in a non-rotating state.
At the upper end of the furnace body 1, a hearth 1 </ b> A on which raw stones supplied from the raw material tank 3 through the supply pipe 3 </ b> A are deposited is provided in a state of extending in a bowl shape along the horizontal direction.

Between the outer end portion of the hearth 1 </ b> A and the outer end portion of the lid body 2, the outer cylinder portion 4 is disposed in a state supported by the lid body 2.
Although not illustrated, seal means for preventing air from entering from the outside is provided between the lower end portion of the outer cylinder portion 4 and the outer end portion of the hearth 1A.

  A primary stagnant layer A1 of the raw stone is formed on the top of the hearth 1A, and a pusher 5 that pushes the raw stone of the primary stagnant layer A1 intermittently into the furnace body 1 is provided. A secondary staying layer A2 of raw stone is formed.

A burner body B is provided at the center of the lid 2, and the burner body B extends downward with the space surrounded by the lid 2 and the upper portion of the furnace body 1 as a combustion space N. An exhaust gas path 6 is connected to the outer end of the lid body 2 to discharge the combustion exhaust gas generated by the burner body B forming the flame F and burning to the outside. Has been.
Incidentally, the combustion space N is a space partitioned into a cylindrical shape in a state in which intrusion of air from the outside is prevented, and the space center axis Xn of the combustion space N coincides with the rotation axis X of the furnace body 1. .

A diffuser 7 is provided at a position below the combustion space N inside the furnace body 1, that is, an inner position of the secondary stagnant layer A2 in a state of being supported by a support portion 7A attached to the furnace body 1, An ejector 8 that ejects air upward through an internal passage of the diffuser 7 is provided.
That is, the air blown by the ejector blower 9 is configured to be supplied to the ejector 8 through the ejector air supply pipe 10.
Further, the ejection center axis Y of the ejector 8 is configured to coincide with the space center axis Xn of the combustion space N.

Incidentally, since the ejector air supply pipe 10 is piped through the inside of the secondary staying layer A2, the air supplied to the ejector 8 is preheated by the retained heat of the secondary staying layer A2, and the like.
An ejector adjustment damper 11 for adjusting the amount of air ejected from the ejector 8 to a set amount (for example, 220 m <3> / h) is provided at an intermediate position of the ejector air supply pipe 10. In addition, m3 / h means cubic meters / 1 hour, and the same applies hereinafter.

  The air ejected from the ejector 8 passes through the internal passage of the diffuser 7 and is then supplied to the combustion space N. As will be described later, the burner body B is supplied to the combustion space N from the ejector 8. Is also configured to burn as combustion air.

That is, as will be described later, the burner body B is configured to eject downward city gas having a specific gravity lighter than air and combustion air as combustible gas.
The ejector 8 is disposed in a state where the ejector 8 is positioned so as to be separated from the burner main body B along the direction in which the city gas and the combustion air are ejected from the burner main body B and sandwich the combustion space N between the burner main body B. Thus, it functions as an opposed air ejection portion D that ejects combustion air into the combustion space N, and the burner body B and the ejector 8 constitute a heating furnace combustion apparatus.

Further, the pressure around the ejector 8 is lowered by the ejection of air by the ejector 8, so that the combustion exhaust gas existing in the combustion space N flows to the periphery of the ejector 8 through the inside of the secondary staying layer A2. It is configured.
In other words, as shown by the solid line arrow in FIG. 1, the combustion exhaust gas existing in the combustion space N flows through the secondary staying layer A <b> 2 to the periphery of the ejector 8, and then from the ejector 8. It is configured to flow upward together with the jetted air.

Therefore, in the heating furnace of the present embodiment, the radiant heat of the flame F formed in the burner body B heats the primary staying layer A1, and the combustion exhaust gas in the combustion space N passes through the interior of the primary staying layer A1. Then, by heating the primary staying layer A1, the raw stone of the primary staying layer A1 is semi-fired, and the combustion exhaust gas in the combustion space N passes through the interior of the secondary staying layer A2 where the semi-fired raw stone is deposited. Then, the raw material of the secondary staying layer A2 is fired by heating the secondary staying layer A2.
And the processed material after baking of secondary residence layer A2 will be discharged | emitted from the discharge part D intermittently.

  Further, in the heating furnace of the present embodiment, in order to move the raw stone of the primary staying layer A1 to the secondary staying layer A2, the raw stone of the primary staying layer A1 is put into the combustion space N and then put Since the raw stone is heated for firing by the radiant heat of the flame F while passing through the combustion space N, the combustion space N is used as a heat treatment space for the object to be processed put into the combustion space N. Will also work.

Incidentally, although not described in detail, the outside air for cooling is configured to flow into the secondary staying layer A2 through the discharge part D, and the fired processed product discharged from the discharge part D is cooled to a low temperature state. Is configured to do.
The outside air for cooling is mixed with the combustion air ejected from the ejector 8 and supplied to the combustion space N.
That is, in the present embodiment, the amount of combustion air ejected from the ejector 8 functioning as the opposed air ejection portion D is equal to the amount of combustion air supplied through the ejector air supply pipe 10 to the outside air for cooling. It becomes the quantity which added the quantity of.

(Burner body configuration)
As shown in FIGS. 2 and 3, the burner body B includes a burner tile 13 fitted to the lid 2, a ventilation case 14 connected to the rear end portion of the burner tile 13, and a front end side of the ventilation case 14. Inside, a disk-like air ejection body 16 mounted via a heat insulating material 15, a gas ejection cylinder 17 disposed in a state extending over the base end portion of the ventilation case 14 and the air ejection body 16, and a gas A compressed air ejection cylinder 18 is provided inside the ejection cylinder 17.
The air ejection body 16 is formed with a plurality of air ejection holes 16a arranged in the circumferential direction.

As shown in FIG. 1, combustion air blown by the burner body blower 19 is supplied to the ventilation case 14 through the burner body air supply pipe 20, and a plurality of combustion airs are supplied into the ventilation case 14. It is configured to be ejected downward through the air ejection hole 16a.
A burner body air adjustment damper 21 for adjusting the amount of air ejected from the plurality of air ejection holes 16a to a set amount (for example, 140 m3 / h) is provided at an intermediate position of the burner body air supply pipe 20. Yes.

As shown in FIG. 1, the city gas from the city gas supply source is supplied to the gas ejection cylinder 17 through the gas supply pipe 22, and the city gas supplied to the gas ejection cylinder 17 is ejected downward from the gas ejection cylinder 17. It is configured as follows.
A gas amount adjusting valve 23 for adjusting the city gas amount ejected from the gas ejection cylinder 17 to a set amount (for example, 40 m <3> / h) is provided in the middle of the gas supply pipe 22.

As shown in FIG. 1, compressed air supplied from an air compressor 24 as combustion air is supplied to a compressed air ejection cylinder 18 through a compressed air supply pipe 25, and the compressed air supplied to the compressed air ejection cylinder 18 is compressed air. It is configured to be ejected downward from the ejection cylinder 18.
And it is comprised so that the jet speed of compressed air may become a jet speed quicker than the jet speed of the city gas jetted from the gas jet cylinder 17. FIG.
A compressed air adjustment damper 26 that adjusts the amount of air ejected from the compressed air ejection cylinder 18 to a set amount (for example, 30 m <3> / h) is provided in the middle of the compressed air supply pipe 25.

  That is, the burner main body B is composed of a gas ejection cylinder 17 as a combustible gas ejection section that ejects city gas as a combustible gas into the combustion space N, and combustion on the outer peripheral side of the city gas ejected from the gas ejection cylinder 17. An air jet body 16 as an outer peripheral combustion air jet section for jetting combustion air into the space N is provided, and further, toward the ejector 8 in the jet stream of city gas jetted from the gas jet cylinder 17, A compressed air ejection cylinder 18 serving as an internal combustion air ejection section that ejects combustion air at an ejection speed higher than that of city gas is provided in a state of being positioned inside the gas ejection cylinder 17.

  The center axis Z of the gas ejection cylinder 17, the compressed air ejection cylinder 18, and the air ejection body 16 is configured to coincide with the space center axis Xn of the combustion space N.

  The compressed air adjustment damper 26 functions as a jet compressed air amount adjusting means for adjusting the amount of compressed air ejected from the compressed air jet cylinder 18 serving as an internal combustion air jet section. The damper 21 is configured to function as an ejection combustion air amount adjusting means for adjusting the amount of combustion air ejected from the air ejection body 16 as the outer peripheral side combustion air ejection portion.

(About furnaces for heating furnaces)
As described above, the combustion apparatus for a heating furnace includes the burner body B and the ejector 8 as the opposed air ejection portion D, the burner body B is disposed above the combustion space N, and the ejector 8 is combusted. It is configured in a vertical combustion mode arranged on the lower side of the space N.

  Further, as described above, the ejection center axis Y of the ejector 8 coincides with the space center axis Xn of the combustion space N, and the center axis Z of the gas ejection cylinder 17, the compressed air ejection cylinder 18, and the air ejection body 16. However, by being coincident with the space center axis Xn of the combustion space N, the ejector 8 and the compressed air ejection cylinder 18 are provided facing each other with the same axis.

  In this embodiment, the sum of the amount of combustion air ejected from the air ejection body 16 and the compressed air ejection cylinder 18 and the amount of combustion air ejection from the ejector 8 is ejected from the gas ejection cylinder 17. It is set to 1 to 4 times the theoretical combustion air amount of the city gas to be produced, and specifically, for example, 1.05 times.

That is, when the theoretical combustion air amount of city gas is 10.7 m 3 / m 3 and the amount of city gas ejected from the gas ejection cylinder 17 is 40 m 3 / h, for example, the required air amount is Therefore, when the theoretical combustion air amount is set to 1.05 times, 450 m3 / h of combustion air is supplied from the air ejection body 16, the compressed air ejection cylinder 18, and the ejector 8. Will be.
In the present embodiment, the amount of combustion air ejected by the ejector 8 is obtained by adding the amount of outside air for cooling to the amount of combustion air supplied through the ejector air supply pipe 10 as described above. Suppose that it is a quantity.

Further, the ejection amount of the combustion air ejected from the ejector 8 as the opposed air ejection portion D is configured to be larger than the ejection amount of the combustion air ejected from the burner body B.
Specifically, the amount of combustion air ejected from the ejector 8, that is, the amount obtained by adding the amount of external air for cooling to the amount of combustion air supplied to the ejector 8 through the ejector air supply pipe 10. Is set to 70% or more of the above-mentioned total.
It should be noted that the upper limit of the amount of combustion air ejected from the opposed ejection part D can be 9.5% of the above-mentioned total.

  As described above, the amount of combustion air ejected from the ejector 8 is set to be larger than the amount of combustion air ejected from the burner body B, but the city gas ejected from the gas ejection cylinder 17 is set. The combustion air (compressed air) is ejected from the compressed air jet cylinder 18 toward the ejector 8 at a jet velocity faster than that of the city gas into the jet stream of the burner main body B. In other words, the flame F extending toward the side where the ejector 8 exists can be appropriately formed.

  In the present embodiment, the compressed air adjustment damper 26 and the burner main body air adjustment damper 21 are provided, so that the shape of the flame F formed on the front side of the burner main body B becomes stable. Thus, the ratio of the amount of combustion air ejected from each of the air ejection body 16 and the compressed air ejection cylinder 18 can be changed in a state where the amount of combustion air supplied from the burner body B is constant. .

(Experimental result)
For example, when the gas ejection cylinder 17 has a diameter of 21.7 mm and the compressed air ejection cylinder 18 has a diameter of 10.5 mm, a city gas of 40 m 3 / h is ejected from the gas ejection cylinder 17. The ejection speed is 65.2 m / s, and the ejection speed when 20 to 50 m 3 / h of compressed air is ejected from the compressed air ejection cylinder 18 is 167 to 419 m / s. It was confirmed that a straight flame F was formed on the front side of the burner body B.

  Further, for example, under the condition that the city gas of 40 m 3 / h is ejected from the gas ejection cylinder 17 and the compressed air of 30 m 3 / h is ejected from the compressed air ejection cylinder 18, the diameter of the gas ejection cylinder 17 is 21.5 to 42. The city gas ejection speed when changed to 0.7 mm is 65.2 to 11.5 m / s, and the compressed air ejection speed when the diameter of the compressed air ejection cylinder 18 is 10.5 mm is In these cases, it was confirmed that a straight flame F was formed on the front side of the burner body B.

The lower the jet speed of the combustion air jetted from the ejector 8, the easier it is for the straight flame F to be formed on the front side of the burner body B. Therefore, the diameter of the cylinder constituting the ejector 8 Is preferably set as appropriate.
Incidentally, the diameter of the cylinder forming the ejector 8 can be changed, for example, between 15 and 35.7 mm, and for example, when ejecting 220 m <3> / h of combustion air from the ejector 8, The ejection speed varies between 346 and 61 m / s.

And the above-mentioned experiment is a case where 220 m3 / h combustion air is ejected from the ejector 8 at 346 m / s.
However, since the ejector 8 and the burner main body B are separated by about 2200 mm, the speed at which the combustion air ejected from the ejector 8 flows near the burner main body B is about 150 m / s. That is, the speed at which the combustion air ejected from the ejector 8 flows at a position corresponding to the installation location of the burner body B is lower than the ejection speed of the combustion air (compressed air) ejected from the compressed air ejection cylinder 18. is there.

[Another embodiment]
Next, another embodiment is listed.
(A) In the above embodiment, the burner body B is disposed above the combustion space N, and the ejector 8 is disposed as the counter air ejection portion D below the combustion space N, so-called vertical. Although the type of heating furnace is illustrated, in the present invention, the burner body B is disposed on the lower side of the combustion space N, and the ejector 8 is disposed on the upper side of the combustion space N as the opposed air ejection portion D. The heating furnace and the burner body B are arranged on one side of the combustion space N, and the counter air ejection part D is also arranged on the other side of the combustion space N. is there.

(B) In the above embodiment, the heating furnace for firing equipped with the ejector 8 is exemplified as the opposed air ejection portion D, but the present invention can be applied to heating furnaces for various uses other than firing. .

(C) In the above embodiment, the case where a flammable gas having a lighter specific gravity than air is used as the fuel, that is, the case where city gas is used as the fuel is exemplified. It may be carried out in the form of using the flammable gas as fuel.

(D) In the above embodiment, the case where the combustion apparatus for a heating furnace of the present invention is applied to a heating furnace in which the combustion space N is formed inside the furnace body 1 is illustrated, but as shown in FIG. In addition, a combustion space N is formed inside the cylindrical combustion chamber forming body 30, and a combustion gas guide path 31 that leads the combustion gas from the combustion chamber forming body 30 to a heating processing chamber (not shown) burns. The combustion apparatus for a heating furnace of the present invention can also be applied to a heating furnace having a form continuously provided from the chamber forming body 30.

In other words, the burner body B is equipped on the ceiling wall 30A of the combustion chamber forming body 30, and the cylindrical air ejection body 32 that functions as the opposed air ejection section D is equipped on the bottom of the combustion chamber forming body 30. ing.
The burner body B is configured in the same manner as in the above embodiment, and the same components are denoted by the same reference numerals as in the above embodiment, and detailed description thereof is omitted.

The air jet body 32 is configured such that combustion air blown by the counter jet blower 33 is supplied through the counter air supply pipe 34, and in the middle of the counter air supply pipe 34, An opposing adjustment damper 35 for adjusting the amount of air ejected from the air ejection body 32 is provided.
The ejection center axis Y of the air ejection body 32 is configured to coincide with the space center axis Xn of the combustion space N, as in the above embodiment.

  Therefore, in the heating furnace of this other embodiment, the combustible gas ejected from the burner body B is combusted in the combustion space N, and the combustion exhaust gas is introduced into the heating processing chamber through the combustion gas guide path 31. Thus, the object processing object is configured to be heated in the heating processing chamber.

16 Peripheral combustion air ejection part 17 Combustible gas ejection part 18 Internal combustion air ejection part 21 Ejected combustion air quantity adjusting means 26 Ejected compressed air quantity adjusting means B Burner body D Opposing air ejection part N Combustion space Xn Space center axis Y Ejection center axis Z Center axis

Claims (8)

A combustion space partitioned into a cylindrical shape in a state where intrusion of air from the outside is prevented,
A combustible gas ejection portion that ejects combustible gas into the combustion space, and an outer combustion air ejection portion that ejects combustion air into the combustion space on the outer peripheral side of the combustible gas ejected from the combustible gas ejection portion A burner body with
The combustion is disposed in a state of being positioned so as to be separated from the burner body along the direction in which the combustible gas and combustion air from the burner body are ejected and to sandwich the combustion space between the burner body and the burner body. A combustion apparatus for a heating furnace provided with an opposed air ejection section that ejects combustion air into a space,
An internal combustion air ejection section that ejects combustion air at a faster ejection speed than the combustible gas toward the opposed air ejection section in the flow of combustible gas ejected from the combustible gas ejection section, Provided in the burner body in a state located inward of the combustible gas ejection portion,
A combustion apparatus for a heating furnace configured such that an amount of combustion air ejected from the opposed air ejection portion is larger than an amount of combustion air ejected from the burner body. The internal combustion air ejection part is configured to eject compressed air as combustion air,
A jet compressed air amount adjusting means for adjusting the amount of compressed air jetted from the internal combustion air jet section, and a jet combustion air quantity adjusting means for adjusting the quantity of combustion air jetted from the outer peripheral combustion air jet section The combustion apparatus for a heating furnace according to claim 1, wherein: The jet central axis of the opposed air jet part is aligned with the space central axis of the combustion space, and the central axes of the internal combustion air jet part, the combustible gas jet part, and the outer peripheral combustion air jet part are Matched to the space center axis of the combustion space,
The combustion apparatus for a heating furnace according to claim 1 or 2, wherein the opposing air ejection part and the internal combustion air ejection part are provided facing each other with the same axis.   The sum of the amount of combustion air ejected from the outer peripheral combustion air ejecting portion and the internal combustion air ejecting portion and the amount of combustion air ejected from the opposed air ejecting portion is the combustible gas. The combustion apparatus for a heating furnace according to any one of claims 1 to 3, wherein the combustion apparatus is between 1 and 4 times the theoretical combustion air amount of the combustible gas ejected from the ejection section.   The combustion apparatus for a heating furnace according to claim 4, wherein the amount of combustion air ejected from the opposed air ejection section is 70% or more of the sum.   The heating furnace according to any one of claims 1 to 5, wherein the burner body is disposed on an upper side of the combustion space, and the opposed air ejection portion is disposed on a lower side of the combustion space. Combustion equipment.   The combustion apparatus for a heating furnace according to any one of claims 1 to 6, wherein the combustion space is a heat treatment space for an object to be processed put into the combustion space.   The combustion apparatus for a heating furnace according to any one of claims 1 to 7, wherein a combustible gas having a lighter specific gravity than air is usable as a fuel as the combustible gas ejected from the combustible gas ejection section.

Images