JP3924264B2 - Burner, combustion device and plant system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a burner, a combustion apparatus, and a plant system that realize stable ignition combustion against fluctuations in the flow rate (velocity) of discharged gas discharged from various plants and the calorific value of combustible gas.
[0002]
[Prior art]
Conventionally, in oil refining and chemicals handling oil, coal, coke, etc., steel industry, and various plants such as IGCC (gasification combined power generation: coal / oil etc.), waste power generation (gasification melting, carbonization, etc.) A large amount of combustible gas is discharged during plant start-up, shutdown, load fluctuation, or emergency stop. These combustible gases are mainly composed of carbon monoxide (toxic gas), hydrogen, and hydrocarbons, and are made harmless in the exhaust gas combustion treatment apparatus (flare stack) for safety reasons.
[0003]
Up to now, the flare stack that has been applied in the above application fields is mainly an elevated flare stack, which uses a chimney-like combustion cylinder having a height of 50 to 150 m, and emits combustible gas discharged from the plant. The flare burner (combustion device) installed at the top of the chimney stack is discharged and burned into the atmosphere.
[0004]
However, this elevated flare stack burns flammable gas in the atmosphere, so it forms visible flames (which form tens to hundreds of meters of flames, causing visual pollution), noise, black flames, flames Problems such as radiant heat and landscapes are taken up as social problems in environmental conservation and need to be improved.
[0005]
On the other hand, the ground flare stack uses a chimney-like combustion cylinder of up to about 50 m, and releases combustible gas discharged from the plant into the stack from a plurality of flare burners (combustion devices) installed at the lower part of the chimney (stack). It is made to burn (patent document 1).
[0006]
As a result, the ground flare stack has no visible flame (combustion complete in the stack), low noise (combustion noise is low because it burns in the stack by multiple low-capacity burners, and no sound leaks through the soundproof storm wall) ), No smoke, no radiation from the flame, low stack and has the advantage of not damaging the landscape.
[0007]
An example of this ground flare stack is shown in FIGS.
9A is a schematic cross-sectional view of the stack, FIG. 9B is a cross-sectional view taken along the line AA of FIG. 9C, and FIG. 9C is a partially enlarged view of FIG. 9B (burner 11 and ignition means 14). . FIG. 10 is a partially enlarged view of FIG. 9A, and FIG. 11 is a configuration diagram of the burner.
[0008]
As shown in these figures, a plurality of burners 11 are disposed in the vicinity of the ground in the stack 10, a supply pipe 13 that supplies the burner 11 with a release gas 12 from a plant, and a discharge supplied to the burner. Combustion device 15 is configured by ignition means (for example, an ignition torch) 14 for igniting gas. Note that since the combustion is performed by natural ventilation, a wind barrier 16 is provided around the stack 10. As shown in FIG. 9B, a plurality of sub burners are provided around the main burner (the burner located at the center in the figure) so as to surround the main burner, and the discharge amount of the release gas 12 In response to this, the emitted gas is burned.
[0009]
Further, as shown in FIG. 9C, FIG. 10, and FIG. 11, the burner 11 has a flat elongated gas nozzle having a header 17 communicating with the supply pipe 13 and slit openings 18a radially disposed in the header 17. (Hereinafter referred to as “flat nozzle”) 18, and the emitted gas 12 is ignited and burned by the ignition means 14 provided with the igniter 14 a. The flat nozzle 18 has a triangular cross section, communicates the header 17 and the inside of the slit, and discharges the released gas 12 from the slit opening 18a to the outside. A plurality of ignition means 14 may be disposed between the flat nozzles 18.
[0010]
Further, as shown in FIG. 11, the burner 11 is provided with a flame holding plate 20 having a substantially V-shaped cross section supported by a support member 19 with a predetermined interval in the gas blowing direction of the slit opening 18a. We are aiming for stable combustion.
[0011]
However, since the height of the stack is low and the combustion site is burned near the ground at the bottom of the stack, it is necessary to reliably detoxify the gas. That is, in the case of non-ignition, there is a problem that if the flammable toxic gas is released from the stack to the atmosphere, the landing concentration becomes high if the gas diffusion is not sufficient because the release point is low.
[0012]
Further, in each plant in the application field, the amount of released gas (gas flow rate) and the amount of heat generated by the gas greatly change during operation phases such as start-up / stop, load change, and emergency discharge operation. Especially when the calorific value of the processing gas is low, the combustion range for stable combustion (the gas flow rate range with respect to the gas calorific value) is narrow, and the generated (discharged) gas flow rate with respect to the plant capacity (processing calorific value) is large. In the flare burner in flare, it is difficult to make the combustion harmless stably throughout the plant operation phase.
[0013]
That is,
1) At the time of plant start-up, the calorific value of the released gas during the system warm-up operation changes, and the calorific value is reduced by switching from the combustion gas or inert gas state with no calorific value to the gasification operation state. Change to flammable gas.
Further, the amount of processing gas (gas flow rate) also rapidly increases (for example, about 2 to 10 times) from the low load state (low flow rate) during system warm-up to the rated load operation.
[0014]
2) When the plant is shut down, if the load is shut off from the steady operation state (a large amount of combustible gas is discharged to the ground flare by shutting off the combustible gas to the combustible gas utilization system), the gas amount (flow velocity) is zero or It increases from the minimum flow rate state to the maximum flow rate (instantaneous increase from a few m / s to a little less than 100 m / s).
There are also calorific value fluctuations (changing from the rated state to near zero) and flow rate fluctuations (changing from the maximum to near zero) due to the inert gas (nitrogen etc.) replacement operation in the system.
[0015]
3) In plant operation, respond to sudden pressure fluctuations in the system and change the amount of gas released to the ground flare stack to absorb abnormal pressure increases in the system. The calorific value changes in the amount of gas in the rated state (repeat and release are repeated).
[0016]
[Patent Document 1]
US Pat. No. 4,070,146 (FIGS. 9 and 12)
[0017]
[Problems to be solved by the invention]
In the existing flare burner described above, the following problems (a) to (c) are caused with respect to fluctuations in the combustible gas processing flow rate (flow velocity) and the combustible gas heat generation amount in the above (1) to (3). It needs to be solved.
[0018]
(A) At the time of initial ignition or misfire reignition, the combustible gas ejected from the flat nozzle of the flare burner does not flow to the torch flame position of the ignition means and does not ignite.
When the flow rate (velocity) of the combustible gas ejected from the flare burner is low, combustible gas is also present on the header side where the torch flame is located. However, when the flow rate (velocity) increases, combustible gas is present at the torch flame position. It is not distributed and cannot be ignited.
Further, there is no low flow velocity region (vortex / circulation region) for igniting and holding the flame in the combustible gas flow in contact with the torch flame, and even if the flame is in contact, the flame blows off in the downstream region and misfires. In particular, the flame position of the ignition torch, which is the ignition means, is located near the header 17 because of the fire transfer between the plurality of flat nozzles 18 and 18 attached to the header, and therefore, it is difficult to ignite.
That is, as shown in FIG. 12, the discharge gas 12 is drifted and no gas pool is generated on the header 17 side, and there is a possibility that the ignition means 14 provided near the header cannot be ignited.
[0019]
(B) Due to the increase in the flow rate of the combustible gas, the ignition position of the combustible gas ejected from the flat nozzle of the flare burner moves away from the nozzle and blows off and leads to misfire.
The flame holding plate of the flare burner flat nozzle is installed on the upper part of the gas nozzle, so the low flow velocity region (vortex / circulation region) for flame holding of the flammable gas ejected from the gas nozzle It is not formed in the diffusion mixing region.
For this reason, when the flammable gas flow rate (flow velocity) increases, there is a problem that the jet gas flow velocity becomes faster than the combustion speed, the ignition position moves away from the nozzle, and the flame blows off and misfires occur.
That is, as shown in FIG. 13, the low flow velocity region (vortex / circulation region) for holding the combustible gas in the released gas 12 is formed above the flame holding plate 20 (inside the released gas 12). On the other hand, the ignition of the combustible gas is released from the nozzle 18, and the emitted gas spreads in the flame holding plate 20, and is formed on the interface mixed with the surrounding air, that is, outside the emitted gas 12. For this reason, as the gas flow rate increases, the ignition point gradually moves away from the vicinity of the flame holding plate 20 and ignites at the upper side. Although the spiral of the gas 12 is generated inside the upper surface of the flame holding plate 20, it is not involved in the gas flame holding and there is a risk of misfire.
[0020]
In view of the above problems, the present invention provides a burner, a combustion apparatus, and a plant system that realizes stable ignition combustion against fluctuations in gas flow rate (velocity) discharged from various plants and combustible gas calorific value.
[0021]
[Means for Solving the Problems]
  The first invention for solving the above-mentioned problem is from a plant.Low calorie releasedAnd a flat nozzle having slit openings radially arranged around the header, and has a predetermined interval on the gas blowing side of the flat nozzle, and is provided along the slit opening. TheThe cross section is substantially V-shapedA flame holding plate, and theThe cross section is substantially V-shapedGas contact surface of flame holding plateA flame holding rod provided along the end of the flame, and a portion of the flame holding rod that is in contact with the flame holding rod. The flame holding rod is disposed at a predetermined interval with respect to the gas contact surface of the flame holding plate having a substantially V-shaped cross section. Reverse L-shaped flame holding ribAnd comprisingIn addition, the flame holding rod and the inverted L-shaped flame holding rib are integrally or separately provided on the flame holding plate having a substantially V-shaped cross section.It is in a burner characterized by that.
[0022]
  According to a second invention, in the first invention,The inverted L-shaped flame retaining ribs are arranged in a staggered arrangement on the left and right of the inclined surface of the substantially V-shaped flame retaining plate.It exists in the burner characterized by being provided.
[0023]
  The third invention is the1 orIn the invention of 2,Inverted L shapeThe flame holding ribEither the same shape, the smaller the shape toward the header, or the smaller the rib lengthIt is in a burner characterized by being.
[0024]
  According to a fourth invention, in any one of the first to third inventions,The low calorie emission gas is 600 to 3000 kcal / m. ^Three N gasIt is in a burner characterized by being.
[0026]
  First5The invention of the first to the4A burner according to any one ofLow calorieSupply pipe for supplying the released gas to the burner, andLow calorieThe combustion apparatus includes ignition means for igniting emitted gas, and a stack that surrounds the burner and the ignition means and discharges combustion exhaust gas from above. The burner may be composed of a main burner and a secondary burner provided around the main burner. In this case, only the main burner may have ignition means.
[0027]
  First6The invention of the5In the invention ofSaidBurnerSaidIn the stackofA combustion apparatus is provided near the ground.
[0028]
  First7The invention of5th or 6thEquipped with a combustion device and discharged from the plantLow calorieA plant system is characterized in that the emitted gas is burned.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Although the form of this invention is demonstrated below, this invention is not limited to these embodiment.
[0030]
[First Embodiment]
The burner according to the present embodiment will be described with reference to FIGS. 1 and 2.
The burner according to this embodiment is provided on the ground side in the stack shown in FIG. 9 and has the same main structure as the burner 11 for burning the plant discharge gas, and the same members are denoted by the same reference numerals. The description is omitted.
[0031]
  As shown in FIG. 1, a radial pattern is formed from the header 17 constituting the burner 100 according to this embodiment.InThe flame holding plate 20 having a substantially V-shaped cross section provided in the flat nozzle 18 provided is provided with a gas flow regulating means on the gas contact surface of the released gas 12. In the present embodiment, the gas flow restriction means includes a flame holding rod 101 provided along the end of the flame holding plate 20 and an inverted L-shaped holding vessel provided in contact with the flame holding rod 101. The flame rib 102 is illustrated as an example, and the gas flow of the released gas 12 is regulated to improve the ignition stability.
  In the present invention, the gas flow restricting means is not limited to the flame holding rod 101 and the flame holding rib 102, but the gas flow of the released gas 12 is regulated and the flow direction is reversed to provide a kind of gas. Any member may be used as long as it is a member that forms a pool.
[0032]
As shown in FIG. 2, the flame holding rod 101 has a circular cross-sectional shape. However, the flame holding rod 101 is not limited to this and may have a rectangular shape, for example.
By providing this flame holding rod 101, as shown in the left part of FIG. 3, a part of the gas flow of the released gas 12 is peeled off, and a large inward vortex 103a is formed in the vicinity of the upper side of the flame holding plate 20. In addition, a small vortex 103b directed outward is formed on the outer side of the flame holding plate 20.
Due to the generation of the vortex flows 103a and 103b, a gas reservoir is formed, and the ignition stability is improved by the ignition means.
[0033]
Further, as shown in FIGS. 1 and 2, flame holding ribs 102 are arranged on the flame holding plate 20 at a predetermined interval. The flame holding ribs 102 regulate the gas flow of the emitted gas 12. I have to.
The flame holding ribs 102 are longitudinally positioned ribs 102 a provided along the inclined surface of the flame holding plate 20 on the gas contact side, and laterally positioned ribs 102 b provided along the same direction as the longitudinal direction of the flame holding plate 20. The inner part of the inverted L-shaped part is directed to the header 17 side.
[0034]
Further, as shown in FIG. 4, the flame holding ribs 102 are not mounted at the same position on the left and right of the inclined surface of the flame holding plate 20, but are mounted in a staggered arrangement on the left and right. Also, adjacent nozzles are arranged in a staggered arrangement on the flame holding plates 20-1, 20-2, 20-3,. In FIG. 4, some of the flame holding ribs are shown, and the others are omitted. Also, the flame holding rod is omitted.
[0035]
In the configuration as described above, the flat nozzle 18 is branched from the header 17, and the structure is an upper opening, and the lower part has a triangular shape inclined from the header to the upper opening. Since the gas 12 is subjected to a lateral flow, the obliquely upward flow is strengthened.
The released gas 12 ejected from the opening 18 a flows obliquely upward along the both inclined surfaces of the flame-holding plate 20. In this flow, both a gas flow that rises by colliding with the flame holding rod 101 provided at the end directly from the inclined surface and a flow that rises after colliding with the flame holding rib 102 are generated.
[0036]
That is, the released gas 12 is released from the opening 18a, but the released gas 12 first comes into contact with the vertical position rib 102a constituting the flame holding rib 102 and the slope side of the lower surface of the flame holding plate 20, and the gas flow rate is reduced. In addition, the gas flow direction changes. The gas abutting on the vertical position rib 102a changes its flow angle to the upward flow by the vertical position rib 102a, and then abuts on the horizontal position rib 102b and the lower surface of the flame holding plate, and then flows to the header 17 side. Changes. On the other hand, the gas flow of the released gas 12 that is in direct contact with the inclined surface of the lateral position rib 102 and the lower surface of the flame holding plate 20 changes to the adjacent flat nozzle side. In addition, a part of the flame holding rib 102 becomes an inverted vortex.
Thereafter, the reversed gas flow is changed to an upward flow again and finally rises while colliding with the flame holding rod 101. At that time, a collision occurs between the lower surface of the flame-holding plate 20 and the flame-holding rib 102, and a part of the gas forms a reverse flow, resulting in a gas pool.
Thus, conventionally, when the flow velocity of the discharge gas 12 is increased, the gas ejected from the flat nozzle is biased toward the nozzle tip side (the direction away from the header side) and is difficult to be supplied to the header 17 side. Even in the case of a flow rate, it was stably supplied to the header 17 side.
[0037]
Therefore, by providing the flame holding plate 101 and the flame holding rib 102 on the flame holding plate 20, the state of gas flow is regulated and a gas pool is generated on the header 17 side, so the torch flame which is the ignition means 14. Stable ignition by. The burner flame that has been ignited forms a burner flame over the entire surface of the gas opening 18a when the load is low and the calorie is low or the jetting speed of the combustion gas is low. Moreover, the fire transfer property between adjacent nozzles is also improved.
[0038]
Further, as shown in FIG. 9B, even when the discharge gas is supplied to the sub burner provided around the main burner according to the supply amount of the discharge gas 12, gas accumulation occurs, so that good ignition is performed. be able to.
[0039]
The state of the gas flow will be described in more detail with reference to FIG.
FIG. 5A is a schematic diagram showing a state of gas flow inside the flame holding rib 102 (header side). FIG. 5B is a schematic diagram showing a state of gas flow outside the flame holding rib 102. FIG.5 (c) is the schematic diagram which looked at the upper side from the lower side of the burner.
The schematic diagram shown in FIG. 5 shows the state of the gas and flame emitted from the nozzles 18-1 and 18-2 radially disposed on the header 17 constituting the burner 100.
As shown in FIG. 5A, the gas released from the nozzles 18-1 and 18-2 is ignited stably by the flame from the flame-holding rib 102 and is ignited stably (A portion in the figure). Further, the gas released from the nozzles 18-1 and 18-2 is stably ignited by collision between flames and vortex formation at the flame holding rib 102 and the flame holding rod 101 (B portion in the figure). In addition, a downward flame is formed by the flame holding ribs 102, and the low-flow-rate released gas 12 is diffused into the air, resulting in stable flame holding (C portion in the figure).
[0040]
Moreover, as shown in FIG.5 (b), it ignites stably by the vortex formation of the flame holding rib 102 and the flame holding rod 101 (D section in a figure).
Moreover, as shown in FIG.5 (b), the flame from the flame-holding rib 102 becomes a fire type, and stable ignition is carried out by the vortex formation of the flame-holding rod 101 (E part in a figure).
[0041]
As a result, at the time of initial ignition or misfire reignition, the combustible gas in the discharged gas ejected from the flat nozzle of the flare burner flows to the torch flame position, and stable ignition can be achieved.
Further, even when the flow rate (velocity) of the combustible gas to be ejected increases, the combustible gas flows through the torch flame position, and stable ignition can be achieved.
Further, the low flow velocity region (vortex / circulation region) for igniting and holding the flammable gas flow in contact with the torch flame is increased, and misfire is prevented. In particular, the gas flow on the header side is generated by the inverted L-shaped flame retaining rib, and the fire transfer between a plurality of flat nozzles attached to the header is improved.
[0042]
In addition, there is a low flow velocity region (vortex / circulation region) for holding the flame between the flat nozzles regardless of the presence or absence of ignition means, so even if there is an increase in the flow rate of combustible gas, it is ejected from the flat nozzle. Thus, the ignition position of the combustible gas does not move away from the nozzle, and the occurrence of misfire due to blow-off as in the conventional case is prevented.
The flame holding ribs 102 provided on the flame holding plate 20 regulate the gas flow of the combustible gas ejected from the opening 18a of the nozzle 18 and form a low flow velocity region (vortex / circulation region) for flame holding. , The diffusion mixing area of combustible gas and air increases.
As a result, even when the flow rate (flow velocity) of the combustible gas increases, the ignition position does not move away from the nozzle, and the conventional flame blow-off misfire is eliminated.
[0043]
The air necessary for combustion of the released gas 12 is accompanied by the gas flow of the released gas 12, but most of the air passes between the flame holding ribs 102 and is supplied to the main combustion region.
[0044]
In plant operation, if the low calorie gas ejection speed increases as the load increases, the burner flame becomes dilute in the ignition part of the flame-holding rod, and the flame-holding becomes intimidated. Since the swirl flow that is the ignition source is stably formed in the low flow region formed between the lower inclined surface of the flame plate 20 and the flame holding rib 102, for example, the calorific value is 600 kcal / m.^ThreeN, stable ignition is possible even at a high flow rate of 50 m / s or more, and stable combustion can be continued.
On the other hand, when no gas flow regulating means is provided on the flame holding plate, for example, the calorific value is 1100 kcal / m.^ThreeWith N, stable ignition could be performed only at a low flow rate of 3 m / s or less. Further, in the present embodiment, in the case of the same calorific value (1100 kcal / m^ThreeN) was able to sustain stable ignition even at a high flow rate of 90 m / s.
At this time, the length of the flame holding plate 20 was 1200 mm, and the length of the V-shaped inclined portion was 50 mm. Further, the flame holding rod 101 having a diameter of 6 mm was used, and the flame holding rib 102 having a vertical position rib 102a of 40 × 50 mm and a horizontal position rib 102b of 40 × 40 mm was used.
[0045]
The size of the flame holding rod and flame holding rib is not particularly limited, but the flame holding rod is 1/20 to 1/10 of the length of the V-shaped inclined portion, and the flame holding rib is the length of the V-shaped inclined portion. It is preferable to set to 1/5 to 1/1.
[0046]
Here, the low calorie gas in the present invention means a gas having a low calorific value generated by gasification (partial oxidation) of oil, coal, etc., for example, 600 to 3000 kcal / m.^ThreeN gas. As described above, when the plant is started up or when a safety valve is activated, a gas with a high calorie may be released or a low-calorie released gas may be burned.
[0047]
Further, as shown in FIG. 6, the flame holding ribs 102-1 and 102-2 may be made different so that a smaller shape or a smaller rib length is disposed toward the header 17 side.
Thereby, the gas flow of the discharge gas 12 with a large flow velocity away from the header 17 can be reversed to the header side.
[0048]
Further, the shape of the flame holding plate 20 is not limited to a substantially V shape, and a U shape or a concave shape may be used.
[0049]
In the present invention, the present invention is applied to a burner for a ground flare stack. However, the present invention is not limited to this, and may be applied to a burner for an elevated flare stack.
[0050]
[Second Embodiment]
In the present embodiment, the flame holding rib and the flame holding rod are separate in the first embodiment, but in the present embodiment, both are integrated.
FIG. 7 shows a schematic diagram of a flame holding plate according to the present embodiment.
[0051]
As shown in FIG. 7, in the present embodiment, the flame holding plate 110, which has notches having long and short widths alternately at regular intervals over the entire length of the flame holding plate 20, is inclined. A type I flame holding rib 111 is mounted on the end of the surface and regulates the gas flow along the inclined surface. In the case where the gas flow restricting means is composed of the flame holding rod 101 and the flame holding rib 102 as in the first embodiment, they are separate members. In this embodiment, however, it is only necessary to process a flat plate. A member is simplified and it can contribute to member reduction.
Since the regulation of gas flow is the same as that in the first embodiment, the description thereof is omitted.
[0052]
[Third Embodiment]
In the present embodiment, a plant system is constructed using the burner 100 according to the first or second embodiment. FIG. 8 is a schematic view of a plant having a gasifier.
[0053]
As shown in FIG. 8, a gasification furnace 201 for gasifying liquid / solid fuel (coal, petroleum, etc.), waste / biomass, etc., dust removal means 202 for removing soot and the like in the gasification gas, and dust are removed. In a plant system comprising a gas purification means 203 for removing impurities (nitrogen compounds, sulfur compounds, etc.) in the gas and a combined power generation means 204 for generating electric power using the purified gas, the gas discharged from the plant 12 is supplied as a gas. A combustion device 205 is provided which is supplied through the pipe 13 and combusts. By using the burner 100 provided with the above-described flame holding plate 20 provided with the gas holding means on the flame holding plate 20 of the combustion device 205, the gas condition of the discharged gas 12 released from the plant was changed. Even in this case, it is possible to always stably burn out the emitted gas. Further, the gas emitted from a safety valve (not shown) is also processed.
[0054]
In the present embodiment, the gasification plant has been described as an example. However, the plant of the present invention is an oil refining / chemical industry that handles petroleum, coal, coke, etc. ), Waste gas generation (gasification, melting, carbonization, etc.), etc., can be stably combusted, and by having the combustion apparatus according to the present invention in various plants, a safe plant Operation can be planned.
[0055]
【The invention's effect】
According to the present invention, at the time of initial ignition or misfire reignition, the combustible gas in the discharged gas ejected from the flat nozzle of the flare burner is circulated to the ignition torch flame position, and stable ignition can be achieved.
[0056]
Further, even when the flow rate (velocity) of the combustible gas to be ejected increases, the combustible gas flows through the ignition torch flame position, which is the ignition means, and stable ignition can be achieved.
[0057]
In addition, regardless of the presence or absence of ignition means (when the secondary burner or ignition means is misfired), a low flow velocity region (vortex / circulation region) for flame holding exists between the flat nozzles, so the increase in the flow of combustible gas Even in such a case, the ignition position of the combustible gas ejected from the flat nozzle does not move away from the nozzle, and the occurrence of misfire due to blow-off as in the conventional case is prevented.
[0058]
Therefore, safe operation of the plant can be achieved by using a combustion apparatus equipped with such a burner.
[Brief description of the drawings]
FIG. 1 is a schematic view of a burner according to a first embodiment.
FIG. 2 is a perspective view of a flame holding plate according to the first embodiment.
FIG. 3 is a schematic diagram of gas flow.
FIG. 4 is a plan view of a burner.
FIG. 5 is a schematic diagram of gas flow and combustion.
FIG. 6 is a perspective view according to another embodiment of the flame holding plate.
FIG. 7 is a schematic view of a flame holding plate according to a second embodiment.
FIG. 8 is a schematic configuration diagram of a plant system.
FIG. 9 is a schematic view of a combustion apparatus.
FIG. 10 is a cross-sectional view taken along line AA in FIG.
FIG. 11 is a configuration diagram of a conventional nozzle.
FIG. 12 is a schematic view of a conventional combustion state.
FIG. 13 is a schematic diagram of a conventional gas flow.
[Explanation of symbols]
10 stacks
11 Burner
12 Emission gas
13 Supply pipe
14 Ignition means
15 Combustion device
16 Wind barrier
17 Header
18a Slit opening
18 Flat nozzle
19 Support member
20 Flame holding plate
100 burners
101 Flame holding rod
102 Flame holding rib

Claims (7)

A header for supplying low-calorie emission gas emitted from the plant;
A flat nozzle having slit openings radially arranged around the header;
A flame holding plate having a predetermined interval on the gas blowing side of the flat nozzle and having a substantially V-shaped cross section provided along the slit opening;
And flame holding rods provided along the edge of the gas contact surface of the flame holding plate of the cross-section substantially V-shaped,
A part of the flame holding rod is provided in contact with the flame holding rod, and an inverted L-shaped flame holding rib disposed at a predetermined interval with respect to a gas contact surface of the flame holding plate having a substantially V-shaped cross section. as well as,
The burner , wherein the flame holding rod and the inverted L-shaped flame holding rib are integrally or separately provided on the flame holding plate having a substantially V-shaped cross section . In claim 1 ,
The burner, wherein the inverted L-shaped flame retaining ribs are provided in a staggered arrangement on the left and right sides of the inclined surface of the substantially V-shaped flame retaining plate . In claim 1 or 2,
The burner characterized in that the inverted L-shaped flame retaining ribs are any one of the same shape, a smaller shape as it goes to the header side, or a rib length that is shorter. In any one of Claims 1 thru | or 3,
The low calorie emission gas is 600 to 3000 kcal / m. ^Three A burner characterized by being N gas. A burner according to any one of claims 1 to 4 ;
A supply pipe for supplying low-calorie release gas to the burner;
Ignition means for igniting the supplied low-calorie emission gas;
A combustion apparatus comprising: a stack that surrounds the burner and the ignition means and discharges combustion exhaust gas from above. In claim 5 ,
Combustion apparatus characterized by the burner is installed on the ground near the said stack. Plant system, characterized in that comprises a combustion apparatus according to claim 5 or 6, to combustion treatment outgassing of the low calorie emitted from the plant.

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