KR0151792B1 - Gas-apparatus for baking - Google Patents

Abstract

The pipe burner in the burning chamber includes: a main body of a pipe burner for supplying a gas mixture manufactured by mixing primary combustion air and fuel gas; A secondary air supply pipe for supplying secondary combustion air is provided. In one embodiment, the secondary air supply pipe is made to extend along the pipe burner main body, and the secondary combustion air enters the secondary air distribution channel through the distribution port and passes through the burner port ribbon installed in the gap. It is supplied to the gas discharge slot installed inside. Alternatively, the secondary air supply pipe may be installed to receive the pipe burner main body so that the secondary combustion air is installed near the burner port of the pipe burner main body from both sides of the burner port. Exhaust gas is discharged through the flame guide slot formed in the secondary air supply pipe.

Description

Gas burning device

1 is a structural explanatory diagram of a bakery apparatus using a conventional gas

2 is an overall structural diagram of a bakery apparatus according to a first embodiment of the present invention

3 is an enlarged view of the pipe burner of the first embodiment.

4 is a cross-sectional view taken along the line A-A of FIG.

5 is an overall structural diagram of a baking apparatus according to a second embodiment of the present invention

6 is an enlarged view of the pipe burner of the second embodiment.

7 is a cross-sectional view taken along the line A-A of FIG.

[Background of invention]

[Field of Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a baking apparatus using a gas, and more particularly, to an apparatus for baking bread and pastry dough using a baking chamber provided with a plurality of pipe burners.

[Description of Prior Art]

There are various types of baking apparatuses in which a gas burner is installed in a conventional baking chamber.

That is, a fixed burning device in which the material remains fixed during baking, a rotating baking device in which the material is placed on the rotating shelf during baking, and a conveyor baking device for transferring the material from the inlet to the outlet of the baking chamber, the material during baking. Tunnel-type burning devices are placed sequentially.

1 is a longitudinal cross-sectional view of a conventional tunnel type baking apparatus 100 using gas. The baking apparatus 100 is a baking dough 101, a plurality of cylindrical upper burners 107, and a bread dough (hereinafter, collectively referred to as a material 111 between the upper burners 107 and the lower burners 108). Conveyor 106 for conveying]] is provided. The supply end 102 is provided with a supply conveyor 104 for lifting up the material 111 and the arrival end 103 is provided with an arrival conveyor 105 for unloading bread.

The baking chamber 101 is divided into three regions A, B, and C by the upper partition bricks 113-1 and 114-1 and the lower partition bricks 113-2 and 114-2. The partition bricks 113-1, 114-1, 113-2, and 114-2 form a room for the material 111 and are installed so that the material 111 is transported on the conveyor 106.

A suitably shaped bread dough, ie, material 111, is introduced into the baking chamber 101 from the feed end 102 using the feed conveyor 104 and then loaded onto the conveyor 106. The material 111 is conveyed to the reaching end 103 in the baking chamber 101.

Material 111 is heated by burners 107 and 108 during transportation. Processes in the baking chamber include: preheating in area A closest to the supply end; Baking in area B; And coloring and drying processes in the C region. The final product is discharged from the baking chamber 101 at the arrival end 103.

Installed as a pipe for conveying the gas mixture produced by mixing with fuel gas in an appropriate amount of primary combustion air (hereinafter, simply referred to as primary air) of each of the upper burners 107 and lower burners 108. do. Combustion of the gas mixture takes place in the presence of secondary combustion air (hereafter simply referred to as secondary air) surrounding the burner. The exhaust gas produced as a result of the gas mixture combustion is discharged out by the exhaust duct 109 while the exhaust fan 110 is operating. As the exhaust gas is discharged, fresh air acting as secondary air is introduced into the baking chamber 101 from the supply end 102 and the arrival end 103.

The problem with the above-described structure is that the temperature in the baking chamber 101 is lowered due to the fresh air introduced into the baking chamber 101. Eventually the thermal efficiency is reduced.

It should also be noted that in the baking art it is necessary to control the humidity in the baking chamber to an appropriate level. Since the humidity in the baking chamber is determined by the steam generated from the loaf of bread and the vapor generated from the combustion of the gas, the introduction of fresh air causes the interior of the baking chamber to dry.

It should be noted that large bakeries using gas have multiple burners. These burners may have a non-uniform amount of secondary air reaching them. In such a case, it may be necessary for each of the burners to introduce an excess of fresh air to ensure that the required amount of secondary air is supplied. This results in problems that the temperature in the baking chamber is lowered, the thermal efficiency is lowered, and the humidity is lowered, making it difficult to control the humidity to an appropriate level.

[Summary of invention]

Therefore, one object of the present invention is to provide a baking apparatus in which the above problems are eliminated.

Another specific object of the present invention is to provide a baking apparatus in which the required amount of secondary air is evenly supplied to the burners so that the thermal efficiency is improved and the humidity in the baking chamber can be maintained at an appropriate level.

In order to achieve these objects, pipe burners for burning the gas mixture generated by mixing the primary air and fuel gas of the present invention are installed in the baking chamber, and the secondary air supply pipe is disposed along each of the pipe burners. Allow secondary air to be supplied near the burner ports formed in each of the pipe burners.

According to the baking apparatus of the present invention, only the required amount of secondary air is supplied from the secondary air supply pipe to the vicinity of the burner port of the pipe burner main body. This achieves a highly stable combustion state and a uniform temperature distribution in the baking chamber. In addition, an ideal baking state is realized by preventing excessive drop of humidity in the baking chamber.

In addition, the decrease in thermal efficiency due to the temperature drop caused by the introduction of the secondary air into the baking chamber in an excessive amount is eliminated.

In particular, the present invention provides a baking chamber; A plurality of pipe burners installed near the top of the baking chamber; A plurality of pipe burners installed near the bottom of the baking chamber; A pipeline for supplying a gas mixture made by mixing fuel gas and primary air to pipe burners; Secondary air supply pipes are disposed along each of the pipe burners so that secondary air is supplied near the burner ports formed in each of the upper pipe burners and the lower pipeline burners, and a conveyor for conveying the material to be baked is installed. Provided is a baking apparatus having support bodies installed between pipe burners and lower pipe burners. According to the present invention, the temperature distribution inside the baking chamber is even and the humidity inside the baking chamber is maintained at an appropriate level to realize an ideal baking condition for bread and dough.

In one preferred embodiment of the invention, the secondary air supply pipe is connected to a pipeline branching the pipeline for supplying primary air to the pipe burner. By this structure, the secondary air supplied near the burner port is determined by the amount of primary air supplied there. That is, the required amount of secondary air is automatically supplied in the vicinity of the burner port. Therefore, control of combustion is facilitated.

In another aspect, the present invention provides a baking apparatus installed in the burning chamber of the pipe burners for burning the gas mixture prepared by mixing the primary air and fuel gas, each of the pipe burners; A pipe burner main body supplying a gas mixture prepared by mixing combustion gas and primary air and having a burner port; The main body of the pipe burner is disposed in the secondary air supply pipe, and the burner port is horizontally aligned with the flame guide slot of the secondary air supply pipe, and is located near the burner port existing between the burner port and the flame guide slot by a predetermined distance. Secondary air supply pipe for supplying secondary air to the flame guide slot and the like. Therefore, a more stable combustion state is realized. It should also be noted that the pipe burner main body is always exposed to secondary air to cool.

Thus, thermal deformation of the pipe burner due to combustion is reduced.

[Description of Preferred Embodiment]

2 shows the overall structure of the bakery apparatus 1 according to the first embodiment of the present invention. It is assumed that the baking device is intended to bake bread. In figure 2 a cross-sectional view of the baking chamber 2 is shown.

A plurality of upper pipe burners 3-1 are installed in the vicinity of the upper part of the baking chamber 2, and each of the pipe burners 3-1 is placed laterally with respect to the length of the baking chamber 2. In addition, a plurality of lower pipe burners 3-2 are installed near the bottom of the baking chamber 2, and each of the lower pipe burners 3-2 is placed laterally with respect to the length of the baking chamber 2.

A conveyor 4 for transporting the bread dough 8 appropriately molded and ready to bake is installed between the upper pipe burners 3-1 and the lower pipe burners 3-2.

The baking chamber 2 is partitioned into upper and lower partition walls in three zones, namely, in the preheating zone baking zone and the coloring and drying zone along the passage in which the conveyor 4 carries the bread dough 8.

The ceiling of the baking chamber 2 is provided with an air discharge duct 5 for discharging exhaust gas generated as a result of gas combustion. The exhaust gas is taken out by the exhaust gas fan 6 and discharged out of the baking chamber 2.

Gas is supplied through the distribution line of each gas line 10 of the pipe burners 3-1 and 3-2, ie, one of the branches 10-1. The introduction of the gas line 10 is provided with a safety shut-off valve 11 for shutting off the gas when the device is not in use, and a zero regulator 12 for maintaining the gas pressure at atmospheric pressure.

Each of the branches 10-1 of the gas line 10 is connected to the corresponding one of the pipe burners 3-1 and 3-2 via a mixer 14. Solenoid valve 13 is installed in each of branches 10-1.

The mixer 14 is connected to one of the branches 15-1 of the air line 15. Each of the branches 15-1 supplies the air blown by the turbofan 16 to the mixer 14. The mixer 14 mixes the gas blown from the gas line 10 and the primary air supplied through the branches 15-1 to produce a gas mixture corresponding to one of the pipe branches 3-1 and 3-2. To supply one.

Branch nodes 17 are installed in each of the branches 15-1 of the air line 15. Branches are connected to the primary air supply line 18-1 and the secondary air supply line 18-2 by branch nodes 17 to distribute air. The secondary air supply line 18-2 is connected to the secondary air supply pipe 30 (see FIG. 3) installed in each of the pipe burners 3-1 and 3-2 through the orifice 19.

The air line 15 is equipped with a control valve 20 for controlling the amount of air supplied to the pipe burners 3-1 and 3-2 to adjust the density of the combustion to the temperature inside the baking chamber 2 To control. The control valve 20 is controlled by a temperature indicator / controller 21 operated according to a detection signal from a temperature sensor 23 installed inside the baking chamber 2.

3 and 4 show the pipe burner 3-2 in detail. 3 is a structural diagram of the pipe burners 3-1 and 3-2 and FIG. 4 is a full sectional view. The pipe burner 3-1 or 3-2 has a pipe burner main body 25 having a burner port 26 formed next to it. The burner port ribbon 27 formed of a plurality of corrugated thin sheets has a flame shape generated when the gas is burned and is fixed to the burner port 26 with pins 28.

The pipe burner main body 25 is supported by a support member 29 composed of a flat plate portion 29-1 and a bent portion 29-2, and is attached to the support plate 35.

A secondary air supply pipe 30 having a quadrangular cross section and extending alongside the pipe burner main body 25 is also supported by the support member 29. Distribution ports 31 are formed on one side of the secondary air supply pipe 30 to form a gap in the longitudinal direction. It is open to the secondary air distribution channel 32 formed by the secondary air supply pipe 30 of each of the distribution ports 31 and the bent portion 29-2 of the support member 29.

A narrow passage 33 is formed between the ceiling wall 30-1 of the secondary air supply pipe 30 and the support member 29. The outlet of the narrow passage 33 is arranged to face the burner port 26 of the pipe burner main body 25.

An ignition rod 36 for igniting the gas is attached to the pipe burner main body 25 near the end where the gas is introduced. The flame rod 47 for determining whether or not the gas is ignited is attached to the pipe burner main body 25 near its other end.

The ignition rod 36 is supplied with a high voltage from the ignition transformer 37 shown in FIG. 2 to ignite the gas. Flame rod 47 detects whether the gas is ignited through the end of the pipe burner main body (25). If an improper ignition occurs, the flame relay 38 is actuated to shut off the solenoid valve 13. In this way, the safety of the device is ensured.

Now, the operation of the baking apparatus 1 will be described with reference to FIGS.

The safety shutoff valve 11 of the gas line 10 is opened to supply fuel gas to the gas line 10. This operation is accompanied by the operation of the turbofan 16 for supplying air to the air line 15. Thus, the gas mixture is supplied to the upper pipe burners 3-1 and the lower pipe burners 3-2.

Air supplied to the air line 15 is supplied to the branches 15-1 corresponding to the respective pipe burners 3-1 and 3-2. Each of the branches 15-1 further branches from the branch node 17 to the primary air line 18-1 and the secondary air line 18-2. The ratio of the primary air capacity to the secondary air is set by setting the resistance in the orifice 19 of the secondary air line 18-2 to an appropriate value. Normally, the flow rate of the secondary air is set to be 1/6 or less of the flow rate of the primary air.

The air in the primary air line 18-1 is fed to the mixer 14, where the air is mixed with the gas supplied by the gas line 10. The gas mixture thus formed is supplied to the respective pipe burner main bodies 25 of the upper and lower pipe burners 3-1 and 3-2.

The air supplied to the secondary air line 18-2 is supplied to the secondary air line 18-2 installed along the pipe burner main body 25.

As shown in FIG. 4, the air supplied to the secondary air supply pipe 30 is supplied through the secondary air distribution channel through distribution ports 31 formed at intervals in the longitudinal direction of the secondary air supply pipe 30. Enter (32). The air is then discharged out after passing through the ribbons 34 attached inside the narrow passage 33. By introducing the air supplied by the secondary air supply pipe 31 in the secondary air distribution channel 32 to discharge the air after the air passes through the ribbon 34, the uniform amount of air is narrow passage 33 From the outlet of the pipe burner is discharged over the entire longitudinal range of the main body 25.

In particular, the outlet of the narrow passage 33, which is the outlet of the secondary air, is arranged to face the burner port 26 of the pipe burner main body 25. Therefore, a uniform amount of secondary air is supplied to the burner port 26 over the entire longitudinal range of the pipe burner main body 25.

The gas mixture exiting the burner port 26 of the pipe burner main body 25 becomes combustible after being mixed with the secondary air supplied by the secondary air supply pipe 30. Combustion begins when ignition rod 36 ignites the gas mixture.

We now describe how bread is baked using the apparatus of the present invention. The dish 7 carrying the bread dough 8 to be baked is placed on the conveyor 4 introduced into the baking chamber 2 from the end (not shown).

As with the method described above with respect to FIG. 1, preheating, baking and coloring and drying processes are carried out in each of the regions as the bread dough is conveyed from the feeding end to the reaching end on the conveyor.

Now, a second embodiment of the present invention will be described. 5 shows the overall structure of the bakery apparatus 50 according to the second embodiment of the present invention. In FIG. 5, the same parts as those of the device shown in FIG. 2 are designated by the same reference numerals and description thereof is omitted. The apparatus 50 is provided except that the upper pipe burners 60-1 and the lower pipe burners 60-2 are installed in place of the upper pipe burners 3-1 and the lower pipe burners 3-2. It is basically the same as the device 1.

6 and 7 describe the pipe burners 60-1 or 60-2 in detail. FIG. 6 is a structural diagram of the pipe burner 60-1 or 60-2, and FIG. 7 is a full sectional view thereof. Pipe burner 60-1 or 60-2; A pipe burner main body 62 having a burner port 66 formed next to the pipe burner main body 62; And an outer tube 61 for receiving the pipe burner main body 62. The burner port ribbon 65 formed of a plurality of folded thin sheets is fixed to the burner port 66 of the main pipe burner body 62 by a pin 67 and has a flame shape.

Flame guide slot 64 is formed in the longitudinal direction in the outer tube (61). Four bolt holes 68-1-68-4, which can be engaged with the bolts 63 for fixing the pipe burner main body 62 in place, have a gap formed in the outer circumference of the outer tube 61. do.

The pipe burner main body 62 and the outer tube 61 are respectively connected to the mixer 14 and the secondary air supply pipe 18-2 shown in FIG. The other ends of the pipe burner main body 62 and the outer tube 61 are closed.

6 and 7, the pipe burner main body 62 is disposed in the outer tube 61 so that the flame guide slots 64 of the outer tube 61 are located at a predetermined distance between the burner ports. 66) and extend laterally aligned.

The pipe burner main body 62 is fixed in place by inserting the bolts 63 into the bolt holes 68-1 and 68-4 of the outer tube 61 to engage the nuts 69 and the bolts 63. 7 shows only one of the four bolts 63. The support plate 45 is attached to the outer tube 61 for receiving the pipe burner main body 62. The outer tube 61 is fixed in place by installing the support plate 45 on an installation member (not shown) installed in the baking chamber 2.

The ignition rod 36 is attached to the outer tube 61 near the end where gas is introduced.

Flame rod 47 is attached to the outer tube 61 near its other end.

The operation of the ignition rod 36 and the flame rod 47 is the same as that of the first embodiment, and the description thereof is omitted.

The operation of the baking apparatus 50 will now be described with reference to FIGS.

The safety shutoff valve 11 of the gas line 10 opens the fuel gas and the safety shutoff valve 11 of the gas line 10 to supply the fuel gas to the gas line 10. It is accompanied by the operation of the turbofan 16 for supplying the working air to the air line 15.

Thus, the gas mixture is supplied to the upper pipe burners 60-1 and the lower pipe burners 60-2.

The air supplied to the air line 15 is supplied to the branches 15-1 corresponding to the respective pipe burners 60-1 and 60-2. Each of the branches 15-1 further branches from the branch node 17 to the primary air line 18-1 and the secondary air line 18-2. The ratio between the primary air and the capacity is set by setting the resistance in the orifice 19 of the secondary air line 18-2 to an appropriate value. Normally, the flow rate of the secondary air is set to be 1/6 or less of the flow rate of the primary air.

Air in the primary air line 18-1 is supplied to the mixer 14, so that the air is mixed with the gas supplied by the gas line 10. The gas mixture thus formed is supplied to the respective pipe burner main bodies 62 of the upper and lower pipe burners 60-1 and 60-2.

The air supplied to the secondary air line 18-2 is supplied to the outer tube 61 containing the pipe burner main body 62.

As shown in FIG. 7, the air supplied near the pipe burner main body 62 in the outer tube 61 passes through the burner port 66 of the pipe burner main body 62. Will flow toward the side. The secondary air encourages the combustion of gas at the burner port 66 of the pipe burner main body 62. In this way, each of the burners 60-1 and 60-2 is supplied with a uniform amount of secondary air.

Since the secondary air is supplied from both sides of the burner port 66, as indicated by the arrow in FIG. 7, smooth mixing of the gas mixture and the secondary air supplied through the pipe burner main body 62 is possible. In this way, highly stable combustion is realized.

The gas mixture containing primary air and gas and discharged from the burner port 66 of the pipe burner main body 62 becomes combustible when the secondary air and gas mixture supplied through the outer tube 61 are mixed. . When ignited by the spark generated in this ignition rod 36, combustion starts.

Since the operation of the baking apparatus 1 and the operation of the baking apparatus 50 are the same, the method of baking bread using the baking apparatus 50 is omitted.

According to an embodiment of the present invention, the secondary air necessary for burning the gas in the burning chamber of the baking apparatus is supplied near the burner port of the main body of the pipe burner. In this way, it is possible to supply only the amount of secondary air that is necessary for combustion by preventing an excess of fresh air from being introduced into the baking chamber. Since the passage of the secondary air is provided in each pipe burner to supply the required amount of secondary air, it is possible to obtain a stable combustion state. In this way, a turn down ratio TDR (ratio between maximum combustion fuel and minimum combustion fuel) can be realized, thereby facilitating extensive control of combustion.

The present invention allows the combustion to be uniform in the pipe burner, resulting in a uniform temperature distribution across all of the different areas in the baking chamber. Thus, excessive fresh air is prevented from flowing into the baking chamber, so that excessive drop in temperature is prevented. Therefore, it is possible to prevent the thermal efficiency from deteriorating and to maintain the humidity at a certain level.

In particular, an advantage of the second embodiment is that the pipe burner main body 62 is cooled by the secondary air because the space surrounding the pipe burner main body 62 acts as a passage for the secondary air. This has a highly desirable effect of reducing the heat deformation occurring in the pipe burner main body 62 due to combustion.

It is to be understood that the present invention achieves an ideal high temperature, high humidity baking condition for baking bread and pastry dough in a baking device, whereby fuel combustion is reduced by 30-40% compared to conventional devices.

The above embodiments relate to a tunnel type burner, but the invention is also applicable to a stationary burner or a rotary burner.

The above embodiments are configured such that the secondary air supply pipe and the outer tube are connected to the pipeline branching the pipeline to supply primary air to the main body of the pipe burner, but the secondary air supply pipe and the outer tube are 1 It should also be noted that it can alternatively be connected to an air supply line independent of the primary air supply line.

The present invention is not limited to the above-described embodiment, and modifications and modified structures will not depart from the scope of the present invention.

Claims (6)

Pipe burners 3-1 and 3-2 for burning the gas mixture produced by mixing the primary air and the combustion gas are installed in the baking chamber 2, and the secondary air supply pipe 30 is provided with the pipe. By being disposed along each of the burners 3-1 and 3-2, the secondary air is installed to be supplied near the burner port 26 formed in each of the pipe burners 3-1 and 3-2. Baking apparatus using gas. A baking chamber 2; A plurality of upper pipe burners (3-1) installed near an upper portion of the baking chamber (2); A plurality of lower pipe burners (3-2) installed near the bottom of the baking chamber (2); An air line 15 for supplying a gas mixture prepared by mixing combustion gas and primary air to the pipe burners 3-1 and 3-2; A secondary air supply pipe is provided with a support member 29 and a support plate 35 installed between the upper pipe burners 3-1 and the lower pipe burners 3-2 for carrying the material to be baked. 30 is disposed along each of the pipe burners 3-1 and 3-2 such that secondary combustion air is formed in each of the upper pipe burners 3-1 and lower pipe burners 3-2. Burner using a gas, characterized in that installed to be supplied in the burner port (26) vicinity. The branch 15-1 of claim 1, wherein the secondary air supply pipe 30 is branched from an air line 15 for supplying primary air to the pipe burners 3-1 and 3-2. Burner using a gas, characterized in that piped to). 3. The secondary air supply pipe (30) according to claim 2, wherein the secondary air supply pipe (30) is connected to a separation (15-1) branched from an air line (15) for supplying primary air to the upper pipe burners and the lower pipe burners. Baking apparatus using a gas, characterized in that. Pipe burners 60-1 and 60-2 for burning the gas mixture produced by mixing fuel gas and primary combustion air are installed in the baking chamber 2 and the pipe burners 60-1 and 60-2. Each of the); A pipe burner main body 62 having a burner port 66 and supplying a gas mixture prepared by mixing combustion gas and primary air; An outer tube 61 having a flame guide slot 64 and supplying secondary air in the vicinity of the burner port 66; The pipe burner main body 62 is disposed in the outer tube 61, and the burner port 66 is aligned with the flame guide slot 64 of the secondary air supply pipe in a lateral direction. Burner apparatus using a gas, characterized in that a predetermined distance is maintained between the burner port (66) and the flame guide slot (64). 6. The outer tube (61) according to claim 5, wherein the outer tube (61) is connected to branches (15-1) branched from an air line (15) for supplying primary air to the pipe burners (60-1 and 60-2). Baking apparatus using a gas, characterized in that connected.