JPS5937527Y2 - radiant burner - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a radiant burner.

Conventional radiant burners use gas or light oil as fuel, and heavy oil, which is inexpensive, cannot be used because of problems such as poor flame stability and carbon deposition.

The present invention provides a radiant burner that can use heavy oil as fuel.
・I will explain.

Reference numeral 1 denotes an air node attached to the burner tile 2, which is composed of an outer cylinder part 1A, an inner cylinder part 1B, and an inclined cylinder NIC connecting the inner ends of both cylinder parts IA and IB.

Reference numeral 3 denotes a flame stabilizing plate attached to the outer end of the inner cylindrical portion 1B, and a joint body 3A is integrally formed on the outer surface side of the flame stabilizing plate.

Reference numeral 4 denotes a cover plate attached to the outer end of the joint body 3A, which forms a primary air chamber 5 between it and the flame stabilizing plate 3.

Reference numeral 6 denotes an internal mixing type steam atomizing chip, which passes through the lid plate 4 and the flame holding plate 3 and faces the inside of the furnace. 7 is a primary air hole formed in the cover plate 4, and 8 is an auxiliary air hole formed in the flame holding plate 3. The air holes 9 are auxiliary air holes formed in the inner cylindrical portion 1B, and 10 are secondary air holes formed in the inclined cylindrical portion 1C.

A plurality of these holes 7.8, 9 and 10 are provided in the circumferential direction, and are also provided at an angle with respect to the axis so as to swirl the ejected air in the circumferential direction.

Reference numeral 11 indicates an ignition hole formed in the burner tile 2.

A part of the atomized atomized particles sprayed from the chip 6 is
It mixes with the primary air swirling in the circumferential direction and is ignited by the flame of a pilot burner (not shown) provided on the ignition hole 11 side.

- After being ignited, some of the spray particles are caught up in the stable vortex of primary air generated on the surface of the flame stabilizing plate 30 and burned.
Thereafter, a stable pilot flame A is formed on the surface of the flame stabilizing plate 30 even without a pilot burner.

If the amount of sky air is too large, heavy oil, which starts combustion later than light oil, may cause a misfire, and if it is too small, it may cause carbon to precipitate on the flame-holding plate 3. quantity is taken into account.

Next, auxiliary air, which is a part of the combustion air, is jetted out from both auxiliary air holes 8.9 while swirling in the same direction as the secondary air.

Then, a part of the fuel evaporated by the pilot flame A on the flame stabilizing plate 3 is mixed with this auxiliary air and burned, and serves as a heat source for the remaining combustion and evaporation.

Here, the amount of auxiliary air and the injection position must be carefully determined depending on the properties of the fuel.

That is, depending on the amount of auxiliary air and the ejection position, it may cause carbon deposition on the flame stabilizing plate 3 or on the inner cylinder part 1B, and may also affect the pilot flame and cause a misfire.

Experimental results show that a stable flame can be obtained by setting the amount of auxiliary air to be approximately the same amount as the amount of primary air.

The ejection position and number of holes are determined to match the fuel pattern, but depending on the properties of the fuel, the inner cylinder i1B
In some cases, a plurality of rows of side auxiliary air holes 9 are provided to obtain a good flame.

The remaining combustion air, that is, secondary air, is sent to secondary air hole 1.
The flame B is injected from zero while swirling in the same circumferential direction as the primary air and auxiliary air, and is mixed well with the fuel spray particles, while at the same time spreading the flame B along the burner tile 2 to obtain the desired flame shape.

By installing the auxiliary air holes 8 and 9, the distance between the secondary air hole 10 and the flame holding plate 3 must be slightly different from that of a conventional burner.

If this distance is too short, high temperature gas inside the furnace (low 02) will occur.
C enters around the chip 6, and [0211
The temperature will get too low and it will misfire.

Furthermore, if the length is too long, the fuel evaporation rate due to the circulating flow of the high-temperature gas C in the furnace decreases, which may cause oil and carbon precipitation.

Therefore, after confirming the properties of the heavy oil, the size of the air cylinder 1, combustion air pressure, furnace gas temperature, furnace gas 02 concentration, etc. distance must be determined.

If the viscosity of the heavy oil is too high, an internal mixing type air atomization tip that uses compressed air may be used.As mentioned above, according to the present invention, the atomized particles sprayed from the tip is ignited by the flame of the pilot burner, some of the spray particles are then caught up in the stable vortex of primary air generated on the surface of the flame-holding plate and burned, and even without the pilot burner, the surface of the flame-holding plate is It is possible to form a stable pilot flame.

Further, a part of the fuel evaporated by the pilot flame on the flame stabilizing plate is mixed and burned with the auxiliary air ejected from each auxiliary air hole, and serves as a heat source for evaporating the remaining fuel.

Therefore, even with heavy oil, flame stability can be maintained reliably, carbon precipitation can be prevented, and stable combustion can be achieved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical side view;
FIG. 2 is a partially cutaway front view. 1... Air cylinder, 2... Verna tile,
3...Flame holding plate, 4...Lid plate, 5...
...-Top air chamber, 6...Internal mixing type steam spray tip, 7...-Top air hole, 8...Auxiliary air hole, 9... ...Auxiliary air hole, 10...
・Secondary air hole, 11...Ignition hole, A...
・Pilot flame, B... Flame, C...
High temperature gas in the furnace.

Claims (1)

[Scope of utility model registration request] An air cylinder is provided which is composed of an outer cylinder part, an inner cylinder part, and an inclined cylinder part that connects the inner ends of the inner cylinder parts to each other, and a flame-holding plate is installed inside the outer end of the inner cylinder part. A lid plate is installed in a joint formed on the outer surface of the flame plate, and an internal mixing type spray tip is provided that penetrates the central part of the lid plate and the flame stabilizing plate and faces into the furnace,
A radiant burner characterized in that a primary air hole is formed in a lid body, a secondary air hole is formed in an inclined cylindrical part, and auxiliary air holes are formed in an outer peripheral part of a flame stabilizing plate and an inner cylindrical part.