KR101107466B1 - Single end type regenerative radiant tube burner - Google Patents

Abstract

Two or more heat accumulating parts which were separated in the upper part of the combustion chamber in the bottomed cylindrical radiate tube were arrange | positioned, and were heated by the fuel and one heat storage part in a combustion chamber. In a single end type regenerative radiation tube burner which performs combustion by injecting combustion air and combusting the combustion exhaust gas through another heat storage unit, the equipment is simplified and the cost is reduced. In addition, the operation can be easily performed.

The combustion chamber 11 is provided with two or more heat storage portions 13a and 13b separated on the upper side of the combustion chamber without providing a partition blocking the combustion chamber 11 in the radiant tube 10 having a bottomed cylindrical shape. Switching means 50 for ejecting fuel through the fuel pipe 20 at the same time, injecting combustion air through one heat storage unit to perform combustion, and sequentially switching operations of exhausting combustion exhaust gas through the other heat storage unit. ) Was installed.

Description

SINGLE END TYPE REGENERATIVE RADIANT TUBE BURNER}

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional explanatory drawing of the single-ended regenerative radiation tube burner concerning one embodiment of this invention.

Fig. 2 is a cross-sectional explanatory view showing a state of a tip portion of a fuel pipe in the single-ended regenerative radiation tube burner in the same embodiment.

3 is a cross-sectional explanatory view of a single-ended regenerative radiation tube burner in the embodiment.

DESCRIPTION OF THE REFERENCE NUMERALS

10: radiant tube 11: combustion chamber

13a, 13b: heat storage unit 14a, 14b: combustion air outlet

15a, 15b: intake and exhaust ports 20: fuel pipe

21: fuel supply valve 22: primary combustion spout

23: main outlet port 30: primary air supply pipe

31: primary air outlet 40: ignition device

41: tip plug 42: ignition transformer

50: 4-way switch valve 51: flame monitoring device                 

60: control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation tube burner used as a heating source for a metal melting furnace, an atmosphere heat treatment furnace, and the like, in particular, in a single-ended radiant tube having a bottomed cylindrical shape. The present invention relates to a single-ended regenerative radiation tube burner which burns gas and heats the combustion exhaust gas to accumulate heat in the heat storage unit to be used for heating combustion air.

Conventionally, a radiation tube burner has been used as a heating source for a metal melting furnace or an atmosphere heat treatment furnace, and such a radiation tube burner is not only used with a U-shaped or W-shaped radiation tube, but also due to problems such as restriction of the place of attachment. It is known to use a single-ended radiant tube having a bottomed cylindrical shape.

In addition, in the single-ended radiant tube burner as described above, in order to more effectively utilize the heat of the combustion exhaust gas, a longitudinal partition is provided in the single-ended radiant tube, and this partition leads the front end. In addition to partitioning two combustion chambers communicating from the side, a honeycomb-shaped heat storage body is accommodated at the inlet side of each combustion chamber, and each combustion chamber is substantially parallel with the combustion air. A single-ended regenerative radiation tube burner has been proposed in which a fuel pipe for ejecting fuel is provided (see, for example, Japanese Patent Laid-Open No. 9-79524).

In this single-ended regenerative radiation tube burner, fuel is ejected from one fuel pipe into one combustion chamber, and the fuel is ignited at a high speed of about 60 m / s or more by passing the heat accumulator by a flow path switching means. The combustion air preheated to a temperature higher than the temperature is ejected and combusted, while the exhaust gas is exhausted through the heat storage body from the other combustion chamber, and the operation is alternately performed.

However, when the partition which partitions the inside of a radiation tube into two combustion chambers is provided like the single-ended regenerative radiation tube burner mentioned above, since the cost becomes high and sufficient heat resistance is not obtained in the partition comprised with metal, ceramics etc. There is a problem that a partition made of a material having high heat resistance must be used, and a partition made of such ceramics is likely to be broken, and when broken, a cumbersome operation such as replacing the partition is required.

In the single-ended regenerative radiation tube burner, a fuel pipe for ejecting fuel is provided in each combustion chamber, and the fuel is ejected and combusted from each fuel pipe in correspondence with the combustion in each combustion chamber. In addition, since the piping and the like become complicated, there is a problem that control such as switching the operation of ejecting fuel from each fuel pipe is required.

An object of the present invention is to solve the problems of the single-ended regenerative radiation tube burner as described above, and to simplify the installation, reduce the cost, and make the control easy to execute. It is to be.

In the single-ended regenerative radiation tube burner according to claim 1 of the present invention, in order to solve the above problems, the combustion chamber is not provided with a partition for partitioning the combustion chamber in a bottomed cylindrical radiation tube. Two or more heat accumulators separated on the upper side are arranged to eject fuel through the fuel pipe to the combustion chamber, and to burn combustion air through one heat accumulator, while exhausting combustion exhaust gas through the other heat accumulator. In a single-ended regenerative radiation tube burner provided with a switching means for sequentially switching the operation to be made, one fuel pipe is provided at the axial center of the radiation tube, and the front end of the fuel pipe is provided. A plurality of primary combustion spouts for ejecting fuel in the radial direction thereof, A primary air outlet for discharging air through a main air outlet, a primary air supply pipe on an outer circumferential side of the fuel pipe, and primary air ejected from a primary air outlet provided at the tip of the primary air supply pipe; The fuel ejected from the primary combustion spout of the fuel pipe is mixed outside of the fuel pipe and the primary air supply pipe, and is primary by an ignition device provided near the primary combustion spout of the fuel pipe. The fuel mixed with air was allowed to ignite.

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Further, in the single-ended regenerative radiation tube burner according to claim 2 of the present invention, in the single-ended regenerative radiation tube burner according to the first claim, air for combustion is supplied through one regenerative portion by the switching means. In order to switch the operation of exhausting the combustion exhaust gas through the other heat storage unit while supplying the combustion, control means for stopping the ejection of fuel from the fuel pipe at the time of switching is provided.

In addition, in the single-ended regenerative radiation tube burner according to claim 3 of the present invention, in the single-ended regenerative radiation tube burner according to claim 1 or 2, the combustion air is blown out through the regenerative portion. In this case, the combustion air is blown toward the fuel jetted from the main jet port provided in the fuel pipe.

Next, the single-ended regenerative radiation tube burner which concerns on one Embodiment of this invention is concretely demonstrated based on an accompanying drawing. In addition, the single-ended regenerative radiation tube burner which concerns on this invention is not limited to what is shown to the following embodiment, It can change suitably and can implement in the range which does not change the summary of invention.

In the single-ended regenerative radiation tube burner according to this embodiment, as shown in FIG. 1, the shaft center portion of the bottomed cylindrical radiation tube 10 having a bottom portion formed in a hemispherical shape. One fuel pipe 20 is installed in the fuel pipe 20, and fuel is supplied to the fuel pipe 20 through the fuel supply valve 21, while a partition is not provided in the combustion chamber 11 for burning the fuel. have.

Then, as shown in FIG. 2, a plurality of primary combustion ejection openings 22 for ejecting the fuel supplied as described above in the radial direction and the fuel in the axial direction at the tip end of the fuel pipe 20. The main blower outlet 23 which blows off is provided.

Moreover, in addition to providing the primary air supply pipe 30 so as to cover the outer periphery of the fuel pipe 20, as shown in FIG. 3, a plurality of ends of the primary air supply pipe 30 are provided. The primary air blower outlet 31 is provided, and the primary air blown out from the primary air blower outlet 31 and the fuel sprayed from the primary combustion blower outlet 22 of the fuel pipe 20 are mixed. have.

In addition, the ignition device 40 is inserted into the primary air supply pipe 30 so that the tip plug 41 of the ignition device 40 is used for the primary combustion in the fuel pipe 20. It is located in the vicinity of the jet port 22.

Then, the tip plug 41 of the ignition device 40 is ignited by the ignition transformer 42, and the fuel and primary air ejected from the primary combustion spout 22 of the fuel pipe 20 The mixed gas mixture is ignited and combusted, and the fuel ejected from the main jet port 23 of the fuel pipe 20 is ignited by this flame.

Here, in the case of discharging fuel from the main spout 23 of the fuel pipe 20, the main spout is such that the flame of the fuel spouted from the main spout 23 reaches the bottom of the combustion chamber 11. It is preferable to make the ejection speed of the fuel ejected from (23) 50 m / s or more.

Moreover, it arrange | positions so that the outer periphery of the said primary air supply pipe | tube 30 may be provided, and several thermal storage parts 13a and 13b (two thermal storage parts in embodiment shown in figure) separated in the axial direction are provided, In addition to accommodating a heat storage body formed in a ball shape, a single pipe shape, a honeycomb shape, etc. made of ceramics or the like in the heat storage parts 13a and 13b, the bottom of each of the heat storage parts 13a and 13b is provided. A plurality of combustion air ejection openings 14a and 14b for ejecting combustion air toward the fuel ejected from the main ejection opening 23 are provided.

In the single-ended regenerative radiation tube burner according to this embodiment, the combustion air is blown through one inlet and outlet 15a by the four-way switching valve 50 to the combustion air. The combustion air is heated by heat accumulated in the heat storage body in the heat storage unit 13a, and the thus-heated combustion air is provided at the bottom of the heat storage unit 13a. As described above, the combustion air jet port 14a is ejected from the main jet port 23 and ejected toward the ignited fuel so that the fuel is completely burned in the combustion chamber 11.

Here, in order to blow the heated combustion air from the respective combustion air blowing holes 14a and 14b provided at the bottom of each of the heat storage units 13a and 13b, the fuel blown out from the main blowing hole 23 is used. It is preferable to make the blowing speed of the combustion air blown out from each combustion air blowing port 14a, 14b more than 60 m / s so that the flame of the flame reaches the bottom part of the combustion chamber 11.

In addition, in the single-ended regenerative radiation tube burner according to this embodiment, the combustion state of the fuel ejected from the primary combustion spout 22 of the fuel pipe 20 and the fuel spouted from the main spout 23 is shown. It is made to monitor by one flame monitoring apparatus 51.

As described above, the combustion exhaust gas after burning the fuel in the combustion chamber 11 is led to the other heat storage unit 13b, and the heat in the combustion exhaust gas is transferred to the heat storage unit 13b. After the heat accumulating in the heat storage body, the combustion exhaust gas is exhausted from the other inlet and outlet port 15b through the four-way switching valve 50.

In addition, after performing combustion for a predetermined time in this way, the fuel supply valve 21 is closed by the control device 60 to stop the supply of fuel to the fuel pipe 20, and the 4 The switching valve 50 is switched so that combustion air is led to the other heat storage part 13b through the other inlet and outlet 15b. This prevents the fuel from being supplied to the combustion chamber 11 at the time of non-combustion, suppresses unnecessary consumption of the fuel, and causes excessive fuel in the combustion chamber 11, resulting in incomplete combustion at the next combustion. It is also prevented.

And the fuel supply valve 21 is opened by the said control apparatus 60, a fuel is supplied to the fuel pipe 20, the tip plug 41 of the ignition apparatus 40 is ignited as mentioned above, and fuel The mixed gas mixed with the fuel and primary air jetted from the primary combustion spout 22 of the pipe 20 is ignited and combusted, and is discharged from the main spout 23 of the fuel pipe 20 by this flame. The combustion air jet port 14b provided with the combustion air heated by the heat accumulating by the heat accumulating by the heat accumulator in the said other heat storage part 13b at the time of igniting a fuel. ) Is ejected from the main jet port 23 as described above and ejected toward the ignited fuel, so that the fuel is completely combusted in the combustion chamber 11.

Then, as described above, the four-way switching valve 50 is switched to repeatedly perform the above operation alternately.

In this way, the heat of combustion exhaust gas is in turn stored by the heat accumulator in each heat storage part 13a, 13b, and is utilized effectively.

In the single-ended regenerative radiation tube burner according to claim 1, since a partition for partitioning the combustion chamber is not provided in the radiation tube as described above, the cost is reduced and when the partition is broken, There is no need to perform cumbersome tasks such as changing partitions.

Moreover, in the single-ended regenerative radiation tube burner of Claim 1, one fuel pipe is provided in the axial center part of a radiation tube, and a fuel is ejected in the radial direction at the front-end | tip part of this fuel pipe. A plurality of primary combustion outlets to be discharged and a main outlet for discharging fuel in the axial direction, and a primary air supply pipe on the outer circumferential side of the fuel pipe, and the front end of the primary air supply pipe The primary air ejected from the primary air ejection outlet installed in the fuel mixture and the fuel ejected from the primary combustion ejection outlet of the fuel pipe are mixed outside the fuel pipe and the primary air supply pipe, and the primary combustion ejection outlet of the fuel pipe is mixed. It is made to ignite the fuel mixed with primary air by the ignition apparatus installed in the vicinity, and this flame prevents the axial discharge from the main jet port in the front-end | tip of a fuel pipe. And ignite the fuel ejected from the air, and mix with the combustion air ejected through one heat storage unit to combust the fuel ejected from the main ejection port, while exhausting the combustion exhaust gas through the other heat storage unit, and switch the operation. It is made to switch in order by a means and to execute.

This eliminates the necessity of providing a plurality of fuel pipes so as to correspond to the respective combustion chambers as in the related art, reduces the installation cost by simplifying the piping and the like, and through the one heat storage unit by the switching means as described above. In the case where the combustion air is blown out to combust the fuel, and the operation of sequentially exhausting the combustion exhaust gas through the other heat storage unit is not necessary, the fuel pipe for ejecting the fuel does not need to be sequentially switched as in the prior art. The control can be easily performed.

Further, in the single-ended regenerative radiation tube burner according to claim 2, as described above, the combustion air is supplied through one of the heat storage portions to perform combustion, and the combustion exhaust gas is exhausted through the other heat storage portions. In order to switch the fuel by the said switching means in turn, since the ejection of the fuel from a fuel pipe was stopped by the control means at the time of switching, supply of the fuel gas which was not combusted at the time of switching is suppressed, In addition to suppressing unnecessary consumption of fuel, excess fuel in the combustion chamber is prevented and incomplete combustion occurs at the next combustion.

Claims (3)

A fuel pipe is placed in the combustion chamber by arranging two or more heat storage units separated on the upper side of the combustion chamber without providing a partition for partitioning the combustion chamber in a bottomed radiant tube. A single-ended regenerative radiation tube provided with a switching means for ejecting fuel through and injecting combustion air through one heat storage unit to perform combustion while sequentially switching operation of exhausting combustion exhaust gas through the other heat storage unit. In the burner, One fuel pipe is provided in the axial center of the radiation tube, and a plurality of primary combustion ejection ports for discharging fuel in the radial direction are provided at the leading end of the fuel pipe, In addition to providing a main blower outlet for blowing in the axial direction, a primary air supply pipe is provided on the outer circumferential side of the fuel pipe, and the primary air blown out from the primary air blower outlet provided at the tip of the primary air supply pipe. And an ignition device which mixes fuel ejected from the primary combustion spout of the fuel pipe outside the fuel pipe and the primary air supply pipe, and is installed near the primary combustion spout of the fuel pipe. A single-ended regenerative radiant tube burner characterized by ignition of fuel mixed with primary air. The method according to claim 1, The switching means supplies combustion air through one heat storage unit to perform combustion, while sequentially switching operations of exhausting combustion exhaust gas through the other heat storage unit. Single-ended regenerative radiation tube burner, characterized in that a control means for stopping the ejection of the gas. The method according to claim 1 or 2, A single-ended regenerative radiation tube burner characterized by ejecting combustion air toward a fuel ejected from a main ejection outlet provided in the fuel pipe in ejecting combustion air through a heat storage unit.

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