JPH0627632B2 - Primary air intake device for gasification burner in grain dryer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a gasification burner used as a heat source for drying a grain dryer, and more particularly to an intake device for primary air required for combustion of the burner.

(Prior Art) A gasification burner is a device that atomizes liquid fuel such as kerosene, gasifies it with the combustion heat of the burner itself, and mixes it with air to burn it. Therefore, it is already widely used as a heat source for drying grain dryers.

(Problems to be Solved by the Invention) Here, the air mixed with the gasified fuel is referred to as primary air, but if the primary air is excessive compared to the supply amount of fuel,
The fuel spray scatters (lifts) from the burner's fuel panel, and when it is insufficient, the fuel spray changes from normal blue to red (red fire), and neither burns completely and the burner's thermal efficiency drops significantly.

Therefore, in order to burn the gasification burner with the best efficiency, it is necessary to mix primary air with an appropriate ratio to the fuel. However, in a grain dryer, as the drying progresses, the hot air of the burner increases the grain density of the grain layer and the ventilation resistance increases, so the burner by the suction fan attached to the dryer main body increases. The suction pressure in the vicinity gradually decreases. Due to this effect, the amount of primary air taken in by the burner tends to fluctuate depending on the drying time, and it is difficult to maintain a stable complete combustion state.

The present invention eliminates the fluctuation of the combustion state due to the fluctuation of the suction pressure in the vicinity of the burner, and even if the suction pressure in the vicinity of the burner changes, the intake port of the intake box and the combustion plate in front of the burner The first purpose is to keep the suction pressure applied to the burner almost the same at all times and take an appropriate amount of primary air into the burner to maintain the best combustion state throughout the entire drying process. A second purpose is to be able to install a filter.

(Means for Solving the Problems) In order to achieve such an object, the present invention relates to a grain dryer that dries hot air of a gasification burner by a suction fan to ventilate and dry the grains circulating in the machine. An air intake box is installed in the lower center of the gas outlet of the gasification burner, and a pair of air inlets are opened on the upper surface of the air intake box at symmetrical positions with respect to the center line of the gas outlet of the burner. An intake duct for supplying primary air to the burner is connected to the rear part of the.

Further, in a grain dryer that sucks the hot air of the gasification burner with a suction fan and ventilates the grains circulating in the machine to dry the grain, a suction box is installed in the lower center on the blowout side of the gasification burner, On the upper surface of the intake box, a pair of intake ports are opened at symmetrical positions with respect to the center line of the combustion outlet of the burner, and an intake duct for supplying primary air to the burner is connected to the rear part of the intake box, and Install the air intake box with the air filter inclined.

(Operation) Even if the suction pressure in the vicinity of the burner is reduced, the suction pressure at the opening surface of the intake port is also reduced by a pressure equivalent to that, and the difference between the suction pressures of the two is always substantially equal.

Therefore, the decrease amount of the primary air sucked from the combustion disk due to the decrease of the suction pressure is offset by the increase amount of the primary air sucked from the intake port due to the decrease of the suction pressure of the intake port, and eventually the primary air supplied to the burner is reduced. The amount of does not change.

In addition, outside air constantly passes around the intake box toward the hot air supply port, creating a swirl of air in the rear of the intake box, but since the upper surface of the box does not generate temperature and regulates air flow, the primary air flows smoothly from the intake port. In addition, since the intake port is opened to the left and right with respect to the center line of the combustion plate, the amount of air taken in from the left and right is equal and the hot air of the burner is not biased.

Furthermore, since the intake port opens to the left and right of the burner, there is no need to directly handle the high-temperature combustion of the burner.
Since the preheated warm air is sucked, the burner can be effectively burned.

Further, since the air intake box air filter is installed inside the air intake box in a slanted manner, the filtration area of the air filter can be widened.

(Example) Next, the present invention will be described based on an example shown in the drawings.

1, 2 and 3 show a so-called suction exhaust type circulating grain dryer, 1 is a pair of left and right drying chambers communicating with the bottom of the grain storage chamber 2, the inner and outer surfaces of which are ropes or outer perforated plates. It is composed of such a vent side plate.

3 is a grain collecting room looking into the lower end discharge port of the drying chamber 1, and the sending end of the grain collecting spiral 4 which is laterally placed in the central concave groove is connected to the lower end intake of the grain raising machine 5 arranged in parallel with the dryer main body. Then, the upper outlet of the grain elevator 5 is connected to the starting end of the grain feeding helix 6 which is mounted along the ceiling of the grain storage chamber 2. Reference numeral 7 denotes a diffusion blade that hangs in the center of the ceiling of the grain storage chamber 2, and the end of the grain feeding spiral 6 is opened above the diffusion blade.

Then, a gasification burner B described later is installed in the left and right drying chambers 1, 1
Hot air supply port 8 of the hot air chamber surrounded by the ventilation side plate inside the
The suction fan 10 is installed on the outlet side of the air exhaust chambers 9 surrounded by the ventilation side plates outside the drying chambers 1 and 1 and the outer wall of the dryer 8 while being installed toward the a.

11 is a shield for closing the hot air chamber 8 on the side opposite to the hot air supply port 8a, 12 is a grain inlet communicating with the lower end inlet of the grain raising machine 5, 13 is an outside outlet of the grain, 14 Is a grain discharge valve mounted on the lower end discharge port of the drying chamber 1.

The outside air heated by the burner B, that is, hot air, is sucked into the hot air chamber 8 through the hot air supply port 8a and enters the drying chamber 1 because the suction fan 10 causes a negative pressure inside the machine. Then, the moisture of the grains flowing down to the drying chamber 1 from the grain storage chamber 2 is removed to strongly dry the surface layer thereof, and then the exhaust air containing moisture is generated. Exhaust to the outside of the machine.

The grains in the drying chamber 1 gradually fall into the grain collecting chamber 3 as the grain discharge valve 14 rotates, and are spread by the diffusion blades 7 that rotate through the grain collecting spiral 4, the grain raising machine 5, and the grain feeding spiral 6. Return to the grain storage chamber 2 again. Then, in the grain storage chamber 2, the moisture in the core portion of the grain is diffused to the surface layer to be subjected to conditioning, and then flown back into the drying chamber 1 to gradually dry while circulating inside the machine.

4 and 5 show the gasification burner B described above.

Reference numeral 15 denotes a burner housing case, which is fastened to the front outer wall a of the dryer main body with bolts, and the burner B is installed toward the hot air supply port 8a. A protective net 16 is provided on the back surface of the case 15 to cover the back of the burner B. Reference numeral 17 is an oil supply pipe communicating with a fuel tank (not shown), 18 is a bowl-shaped vaporization cylinder, 19 is a vaporization cylinder 18
A rotating cylinder motor, 20 is a mixing chamber, 21 is an annular combustion plate that covers the front of the mixing chamber 20, and a large number of small holes are drilled. Two
Reference numeral 2 is a flame dish having a large number of ventilation holes formed along the same circumference, and a spark plug 23 is attached thereto.

Reference numeral 24 denotes a sirocco type fan for supplying primary air which is rotated by a fan motor 25. The blower port is connected to the rear of the vaporizing cylinder motor 19 via a blower duct 26 and is sucked into a suction port opened at the center of the fan 24. The duct 27 is connected and the tip of the duct 27 is connected to the intake box Q which will be described in detail below.
Is connected to the connection port 28 at the center of the rear surface of the.

In the present invention, the air intake box Q is 2 as shown in FIGS.
The upper half part 29 and the lower half part 30 are formed by bending the approximate center of a thin iron plate at a right angle, and a pair of side plates 31 and 32 are fixed to both left and right sides of the lower half part 30.

A well-known air intake box air filter 35 made of a non-woven fabric of synthetic fibers is sandwiched between the upper and lower two ventilation plates 33, 34, and a bolt 36 is passed through them to fasten them with a wing nut 37.

Next, the upper half portion 29 and the lower half portion 30 are faced inward and stacked,
Bolts 38 to be installed on the folded pieces of the left and right side plates 31, 32,
38 is inserted into the connection holes 39, 39 bored in the horizontal plane of the upper half portion 29 and fastened by a wing nut (not shown), and the upper ventilation plate 33 of the upper and lower ventilation plates sandwiching the intake box air filter 35 is horizontal. The upper and lower side plates are sandwiched between the front and rear side edges of the upper half part 29 and the lower half part 30, thereby forming an intake box Q in which the whole is assembled in a rectangular parallelepiped shape, and the intake air is drawn along the diagonal line of the part. Assemble the box air filter 35 (Fig. 7).

The intake box Q is placed below the burner B and on the combustion board 21.
It is installed laterally between the hot air supply port 8 and the hot air supply port 8 in the direction orthogonal to the radial direction of the injection, and the connection port 28 is opened in the center of the vertical surface of the lower half portion 30, that is, the center of the back surface of the intake box Q as described above. The intake duct 27 is connected, and a pair of intake ports 40, 40 are opened on the horizontal plane of the upper half portion 29, that is, on the upper surface of the intake box Q at positions symmetrical with respect to the center line of the burner plate 21 of the burner B (see FIG. 5). ).

Here, 41 is a barrier for preventing dust from standing upright at the edge of the intake port 40, and semi-circular air conditioning plates 42, 42 higher than the barrier 41 are projected in the latter half of the barrier.

Then, the fuel sent to the burner B drops from the tip of the oil supply pipe 17 into the central portion of the vaporization cylinder 18 which is rapidly rotated by the vaporization cylinder motor 19, and is sprayed into the mixing chamber 20 by its centrifugal force. On the other hand, after the primary air is sucked from the intake port 40 of the intake box Q by the fan 24 and filtered by the intake box air filter 35, the primary air is passed through the air duct 26 and mixed chamber 20.
Into the spark plug 2 where it is mixed with the atomized fuel described above.
Ignition by 3.

After ignition, the vaporization cylinder 18 is heated by the combustion heat of the burner itself, so that the fuel is vaporized in the vaporization cylinder 18, mixed with the primary air in the mixing chamber 20, and injected from the small holes of the combustion plate 21. This flame is further violently combusted by the secondary air sucked from the many ventilation holes of the flame tray 22.

The burner B thus burning heats the outside air that the suction fan 10 permeates through the protective net 16 of the case 15 and inhales, and the hot air dries the grains as described above, but the drying time elapses. Accordingly, the grain density in the machine changes from sparse to dense and the aeration resistance of the drying chamber 1 increases.

For this reason, the suction pressure near the burner B is reduced even if the number of revolutions of the suction fan 10 is constant, but in the embodiment shown in the drawings, the intake ports 40 and 40 for taking in the primary air are provided at the burner B combustion plate 21 and the hot air supply port 8a. In the middle, since the openings open at symmetrical positions with respect to the center line of the combustion plate 21, even if the suction pressure on the plate surface of the combustion plate 21 is reduced, the intake pressures 40, 40 are equal to the suction pressure.
The suction pressure at the opening surface of is also reduced, and the suction pressures of both are always equal.

Therefore, the decrease amount of the primary air sucked from the combustion plate 21 due to the reduction of the suction pressure of the combustion plate 21 is offset by the increase amount of the primary air sucked from the intake port 40 due to the reduction of the suction pressure of the intake port 40, and eventually, The amount of primary air supplied to the burner B does not change. This is exactly the same when the ventilation side plate of the drying chamber 1 is clogged to increase the ventilation resistance, which reduces the suction pressure near the burner B.

Further, the outside air passes around the intake box Q toward the hot air supply port 8 and a vortex of wind is generated behind the intake box Q, but no vortex is generated on the upper surface of the box Q and the conditioned air flows. The primary air is smoothly taken in through the intake port 40 due to the action of
In addition, since the intake ports 40, 40 open symmetrically with respect to the center line of the combustion board 21, the amount of air taken in from the left and right is equal and the hot air of the burner is not biased.

Further, since the intake ports 40, 40 are opened at positions left and right apart from the combustion board 21, the hot air of the burner B is not directly sucked in, but the warm air around the preheated air is sucked in, so that the burner B is effective. Can burn to.

Further, since the air intake box air filter 35 is installed along the diagonal line of the air intake box Q, the filtration area of the air intake box air filter 35 can be made large and the dust absorption efficiency is improved. Needless to say, when the air intake box air filter 35 becomes dirty and the dust suction function deteriorates, the wing nut is loosened to disassemble the air intake box Q and the air filter 35 is washed or replaced as shown in FIG.

(Effect of the invention) In short, according to the present invention, the intake box Q is installed near the outer edge of the injection outlet of the gasification burner B, and a pair of intake ports 40, 40 are opened on the left and right of the upper surface of the intake box Q. Since the intake duct 26 for supplying the primary air to the burner B is connected to the back surface, the grain density in the machine changes from sparse to dense as the drying time elapses, and the ventilation resistance of the drying chamber 1 increases. 10
The suction pressure by the suction fan 10 in the vicinity of the burnan B is reduced even if the rotation speed is constant, but the intake port 4 for taking in the primary air is
0 and 40 are opened below the combustion plate 21 and at symmetrical positions with respect to the center line of the combustion plate 21, so that when the suction pressure by the suction fan 10 on the plate surface of the combustion plate 21 is reduced, the opening faces of the intake ports 40 and 40 are reduced. The suction pressure by the suction fan 10 is also reduced, and the pressure difference between the combustion plate 21 and the intake port 4 before and after the fluctuation of the suction pressure of the suction fan 10 is substantially equal.

When the suction pressure of the suction fan 10 at the intake port 40 decreases, the primary air sucked from the intake port 40 by the fan 24 tends to increase. On the other hand, the force of sucking out from the combustion disc 21 due to the reduction of the suction pressure of the combustion disc 21 decreases, and this cancels the tendency of the primary air to increase, and eventually the amount of primary air supplied to the burner B is It is determined by the rotation of the fan 24 regardless of the fluctuation of the suction pressure of the suction fan. This is exactly the same when the ventilation side plate of the drying chamber 1 is clogged to increase the ventilation resistance, which reduces the suction pressure near the burner B.

In addition, since the suction ports 40, 40 open symmetrically with respect to the center line of the combustion plate 21, the left suction port 40 and the right suction port 40 are equally affected by the suction fan 10 and the fan 24. As a result, the amount of air sucked in from the left and right is equal and the hot air of the burner is not biased, so that the primary air can be maintained at a predetermined appropriate amount from beginning to end, and therefore the burner B can be burned with the best efficiency throughout the entire drying process. Produce an effect.

Further, according to the present invention, since the air filter 35 is installed along the diagonal line of the intake box B, the filtration area can be widened,
The effect that the dustproof efficiency can be improved is produced.

Further, although the intake ports 40, 40 are located in the vicinity of the combustion outlet of the burner B, a pair of air intakes are provided symmetrically with respect to the center line of the combustion outlet of the burner B. The flow is stable and it is difficult to inhale the blowout. Further, since there is no intake port on the centerline where the spray is most exposed, there is no fear that the spray will be sucked and the intake port will be burnt, and the burner can be effectively burned by absorbing the preheated warm air.

[Brief description of drawings]

The drawings show embodiments of the invention. FIG. 1 is an overall side view of a grain dryer, a part of which is shown in cross section. Figure 2 is II of Figure 1.
-II is a sectional view taken along the line, and FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. 4 is an enlarged central vertical sectional view of the gasification burner. However, for the air intake box, the cross section at a position deviated from the center to the left and right is shown. FIG. 5 is an enlarged rear view of the burner, a part of which is shown in cross section. FIG. 6 is an exploded enlarged perspective view of the intake box, and FIG. 7 is a central longitudinal sectional view of the intake box. B is a gasification burner, Q is an intake box, 10 is a suction fan, 3
5 is an air filter and 40 is an intake port.

Claims (2)

[Claims] 1. A grain dryer that dries hot air of a gasification burner by a suction fan to ventilate the grains circulating in the machine to dry the grain, and an intake box is provided in the lower center of the gas outlet of the gasification burner. Install a pair of intake ports on the upper surface of the intake box at symmetrical positions with respect to the center line of the combustion outlet of the burner, and connect an intake duct for supplying primary air to the burner to the rear part of the intake box. Primary air intake device for gasification burner. 2. A grain dryer that dries hot air of a gasification burner by a suction fan to ventilate the grains circulating in the machine to dry the grain, and an intake box is provided at the lower center of the gas outlet of the gasification burner. Installed, a pair of intake ports are opened on the upper surface of the intake box at symmetrical positions with respect to the center line of the injection outlet of the burner, and an intake duct for supplying primary air to the burner is connected to the rear part of the intake box. In addition, a primary air intake device for a gasification burner, in which the air filter of the intake box is tilted and installed internally.