JP2009103432A - Combustion apparatus and ground flare provided therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion apparatus and a ground flare provided therewith capable of stably combustion disposal of raw gas such as exhaust gas. <P>SOLUTION: In the combustion apparatus of the ground flare introducing the exhaust gas of a low calorific value into a cylindrical combustion tube through an exhaust gas tube, and burning the exhaust gas by a plurality of combustion apparatuses in the combustion tube. The combustion apparatus 7 has a tubular burner 8 arranged in a substantially horizontal direction and arranged with a plurality of raw gas jet holes 8a on a top part, and a flame retaining guard 9 for protecting flame from the raw gas jet holes. The flame retaining guard is provided in a longitudinal direction of the burner 8 in correspondence to an arrangement range of the raw gas jet holes, and it is protrusively provided in at least an upward direction from each sidewall of the burner. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a combustion apparatus that performs combustion treatment of process gas emitted from various plants in the petroleum refining industry, petrochemical industry, steel industry, and the like, and a ground flare equipped with the combustion apparatus.

  There is a flare stack as a facility for combusting surplus gas generated in various plants such as oil refining and steel manufacturing facilities.

  As a general flare stack, a frame-supporting flare stack installed at an oil refinery base is known. In this type of flare stack, exhaust gas is guided to a high place and burned, and radiant heat can be reduced by taking a distance in the height direction.

  However, in the above flare stack, radiant heat and flames affect the surroundings. Therefore, ground flare has been developed and installed in various places to solve these problems.

  Since the ground flare burns exhaust gas in a cylindrical combustion cylinder installed on the ground, the flame is not visible and the exhaust gas can be burned with low noise (for example, Patent Document 1). reference).

The method of treating exhaust gas with the ground flare has an advantage that the influence on the surrounding environment is small.
JP-A-6-34120

  However, since the above-mentioned ground flare is generally configured to ignite a plurality of main burners with one pilot burner, the high calorific amount of exhaust gas can be stably burned, For example, a low calorific amount of exhaust gas containing unburned gas may not be stable due to the influence of the surrounding air flow, and so-called combustion oscillation may occur in which ignition → misfire → ignition is repeated.

  In the event of a misfire, not only unburned gas is released into the atmosphere, but there is also a risk of explosion if the unburned gas fills the combustion cylinder.

  In addition, when gas discharged from a melting furnace or the like is used as exhaust gas, the composition and amount of gas constantly fluctuate, making it difficult to maintain stable combustion. If stable stack temperature cannot be maintained, incomplete combustion will occur. Wake up and pollute the atmosphere.

  In addition, the ground flare generally has a configuration in which a burner is disposed upward at the bottom of an upright combustion cylinder and burns, and when burning in the combustion cylinder, minute combustion vibration generated in the burner is amplified. It may vibrate greatly, or it may cause vibrations that shake the structure, such as air column resonance.

  The minute combustion vibrations that cause the above vibrations are caused by various factors such as fuel flow rate (jet velocity level), fuel flow rate fluctuations, etc., in addition to the fuel calorific value level and the heat value fluctuation as described above. However, there are some unclear parts about the mechanism.

  However, the minute combustion vibration is considered to be mainly caused by disturbances in the air flow, mixing ratio, etc. in the vicinity of the burner. It is expected to suppress the combustion vibration in Therefore, how to stably burn the main burner is a problem in the ground flare.

  In addition, when processing the above-described exhaust gas having a low calorific value or an exhaust gas whose gas composition or amount changes, it is possible to stabilize the flame by mixing an auxiliary combustion gas with the exhaust gas.

  However, if auxiliary combustion gas is used at all times, the temperature in the combustion cylinder rises too much and the equipment becomes dangerous, and wasteful fuel is consumed, resulting in environmental problems.

  The present invention has been made in consideration of the problems in the conventional ground flare as described above, and provides a combustion apparatus capable of stably combusting a processing gas such as exhaust gas and a ground flare equipped with the combustion apparatus. Is.

A combustion apparatus of the present invention is a ground flare combustion apparatus that introduces a processing gas into a combustion cylinder through a processing gas introduction pipe and burns the processing gas by a plurality of combustion apparatuses in the combustion cylinder.
The combustion apparatus has a tubular burner that is arranged in a substantially horizontal direction and has a plurality of processing gas ejection holes arranged at the top, and a flame holding guard for protecting a flame from the processing gas ejection holes,
The flame holding guard is provided in the longitudinal direction of the burner corresponding to the range in which the processing gas ejection holes are arranged, and protrudes at least upward from each side wall of the burner. The gist.

  In the combustion apparatus, a vent hole may be provided in the flame holding guard.

  Further, the flame holding guard can be arranged in a window frame shape so as to surround a flame train formed on the processing gas ejection hole.

  When the flame holding guard is arranged in a window frame shape, the inside of the flame holding guard is depressurized by injecting the processing gas from the processing gas jetting hole, and the air outside the flame holding guard is sent from the vent hole to the holding hole. It can be configured to be sucked into the flame guard.

  Further, the flame holding guard can be projected from the side walls of the burner to the lower side.

  Moreover, the flame guards protruding from the side walls of the burner can be fixed to the burner via bolts.

  Moreover, the auxiliary burner which assists the combustion of the said burner can be provided.

  Further, for introducing the flame of the auxiliary burner into the flame holding guard into the flame holding guard arranged in a window frame shape so as to surround the periphery of the flame row formed on the processing gas ejection hole. An opening can be provided.

  Further, when each of the combustion devices is disposed on a virtual line extending radially from the center of the combustion cylinder, and the auxiliary burner is disposed at the center thereof, a plurality of fuel ejection holes of the auxiliary burner are respectively connected to the opening. It is preferable to arrange them at opposite positions.

  Further, if an auxiliary combustion gas supply pipe for supplying auxiliary combustion gas for increasing the calorific value of the processing gas is connected to the processing gas introduction pipe via an on-off valve, the processing gas component changes and the calorific value is reduced. Stable combustion can be obtained even in an excessive state.

  The gist of the ground flare of the present invention is provided with a combustion device having the above-described configuration and an air amount adjusting device for adjusting the amount of air supplied to the burner.

In the present invention, the processing gas having a low calorific value is, for example, an exhaust gas having a low calorific value including unburned gas discharged from a steelmaking facility, a melting furnace, or the like. Specifically, 12,600 kJ / Nm ³ Although it is (HHV) or less, according to the combustion apparatus of the present invention, it is possible to perform stable combustion especially even for an exhaust gas with a low calorific value of 8,400 kJ / Nm ³ or less.

  According to the combustion apparatus of the present invention, since the processing gas can be stably combusted, combustion vibration can be prevented and air pollution can be prevented.

  Further, according to the combustion apparatus of the present invention in which the flame holding guards are fixed to the burner via bolts, the flame holding guards can be easily attached or detached, and therefore, the maintenance performance is excellent.

  According to the ground flare of the present invention, the amount of air fed into the burner according to the component of the processing gas can be appropriately adjusted by the air amount adjusting device, so that even if the processing gas component and the processing gas amount fluctuate, It is possible to reliably burn the processing gas.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  FIGS. 1-6 shows the structure at the time of applying the combustion apparatus of 1st embodiment of this invention to a ground flare.

  FIG. 1 is a longitudinal sectional view of a ground flare provided with the combustion apparatus of the first embodiment.

  In the figure, the ground flare 1 has a cylindrical combustion cylinder 2 arranged vertically, and this combustion cylinder 2 is erected on a concrete base 3.

  A vertical pipe 5 is erected on the central axis of the combustion cylinder 2 on the pedestal 3, and an upper part 5 a of the vertical pipe 5 is accommodated in a lower part of the combustion cylinder 2.

  A plurality (eight in this embodiment) of branch pipes 6 branch from the body of the vertical pipe upper part 5a and extend upward.

  A combustion device 7 is provided at each upper end of the branch pipe 6 in the horizontal direction.

  2 is an enlarged view of the structure of the combustion apparatus 7. FIG. 2A is a plan view, FIG. 2B is a side view seen from the center side of the combustion cylinder 2, and FIG. ) Is a front view (an enlarged view of a portion B in FIG. 1).

  In these drawings, the combustion device 7 is mainly composed of a main burner (tubular burner) 8 and a flame holding guard 9 for protecting the flame of the main burner 8.

  The main burner 8 is formed of a tubular member connected in a direction (horizontal direction) perpendicular to the standing branch pipe 6, and five process gas ejection holes 8 a are formed on the upper surface along the burner pipe axial direction. Are arranged in a zigzag pattern (see FIG. 2A).

  Note that the number of the processing gas ejection holes 8a is appropriately set according to the flow rate of the processing gas. If the desired ejection speed cannot be obtained, the number of processing gas ejection holes 8a is reduced to bring the ejection speed closer to the designed specifications, whereby the processing gas is evenly distributed from the remaining processing gas ejection holes 8a. It can be ejected, and backfire can be prevented.

  The flame guard 9 is provided in the longitudinal direction of the main burner 8 corresponding to the range in which the process gas ejection holes 8a are arranged, and is projected from the side walls of the main burner 8 upward. .

  Specifically, the flame guard 9 has a pair of vertical plate portions 9 a and 9 b that are welded at the lower edges to the left and right body portions of the main burner 8 and are set up in parallel in the vertical direction.

  In FIG. 2 (c), the left side openings of these vertical plate portions 9a and 9b are partially blocked by installing the first connecting plate 9c on the vertical plate portions 9a and 9b.

  Further, the right end portions of the vertical plate portions 9a and 9b are totally blocked by installing the second connection plate 9d on the vertical plate portions 9a and 9b.

  Thereby, the flame holding guard 9 is arranged in a window frame shape so as to surround the periphery of the flame train formed on the processing gas ejection hole 8a with the opening C formed only on the left side.

  A plurality of vent holes 9e are provided along the tube axis direction of the main burner 8 on the lower side of the vertical plate portions 9a and 9b (three in series in this embodiment).

  A flame guard 9 having the above-described configuration is provided in each main burner 8.

  FIG. 3 shows a plan view of the arrangement of the combustion device 7.

  A main burner 8 with a flame guard 9 is arranged on an imaginary line extending radially from the center O of the combustion cylinder 2, and an auxiliary burner 10 is provided at the center of the plurality of main burners 8.

  The auxiliary burner 10 functions as a fire type in order to ensure ignition of each main burner 8, and continues to emit a flame toward the main burner 8 after ignition.

  In the combustion apparatus 7 of the first embodiment, an auxiliary burner 10 is combined with the main burner 8 with a flame holding guard.

  FIG. 4 is an enlarged view of the auxiliary burner 10, wherein FIG. 4 (a) is a plan view and FIG. 4 (b) is a front sectional view.

  In both figures, the auxiliary burner 10 is provided with a hollow disk part (functioning as a header) 10a and fuel ejection holes from the trunk part of the disk part 10a in three directions on a horizontal plane.

  In FIG. 4A, the first fuel injection hole 10b is arranged toward the opening C of each flame holding guard 9 described above.

  The second fuel injection hole 10c is provided in a state inclined toward the left side (in the drawing) by 25 ° with respect to the first fuel injection hole 10b, and the third fuel injection hole 10d is the first fuel injection hole. It is provided in a state inclined to the right side (on the paper surface) by 25 ° with respect to 10b.

  The second and third fuel ejection holes 10c and 10d are provided for transferring to the adjacent fuel ejection holes (from 10d to 10c or vice versa).

  For example, natural gas is supplied to the auxiliary burner 10 as fuel.

  Returning to FIG.

  A processing gas introduction pipe 11 is connected to a substantially central portion in the vertical direction of the vertical pipe 5 so that a processing gas containing unburned gas is supplied to the vertical pipe 5 in a state of being pressurized by a blower. ing.

  Specifically, a water sealing tank (not shown) is provided on the upstream side of the processing gas introduction pipe 11, and the processing gas to be burned is sent into the water sealing tank by a blower to prevent a backflow of air. Then, the air bubbles are floated and are sent to the processing gas introduction pipe 11.

  If the calorific value of the processing gas is too low, an auxiliary gas supply pipe can be connected to the processing gas introduction pipe 11 to mix the auxiliary gas with the processing gas having a low calorific value to increase the calorific value. Moreover, it is preferable to connect an auxiliary combustion gas supply pipe to the processing gas introduction pipe 11 via a switching valve so that the auxiliary combustion gas can be supplied as necessary.

  In the figure, 12 is a pilot burner for igniting the main burner 8, 13 is an inspection manhole, 14 is a visual inspection port, and 15 and 16 are upper ducts.

  A duct 4 is connected to the lower part of the combustion cylinder 2, and a damper 4 a is provided in the duct 4. Thereby, the amount of air supplied to the upper part of the main burner 8 can be adjusted. The duct 4 with the damper 4a functions as an air amount adjusting device.

  In addition, a thermometer TE1 is disposed on the upper portion of the main burner 8, a thermometer TE2 is disposed on the upper portion of the upper duct 15, and the combustion state is monitored based on the temperatures measured by the thermometers TE1 and TE2. The amount of auxiliary combustion gas can be adjusted to a temperature at which unburned gas is not discharged. Furthermore, if the opening degree of the damper 4a is adjusted based on the temperatures measured by the thermometers TE1 and TE2, the amount of air supplied from the duct 4 can be adjusted appropriately.

  As shown in FIG. 3, the flame f of the pilot burner 12 reaches the outer periphery of the auxiliary burner 10, and thus ignites in the order of the pilot burner 12 → the auxiliary burner 10. Since the flame of the auxiliary burner 10 reaches a position approximately half the longitudinal direction of the main burner 8, ignition is performed in the order of the auxiliary burner 10 → the main burner 8.

  Next, the combustion operation of the combustion apparatus 7 having the above configuration will be described with reference to FIGS.

  The processing gas introduced into the vertical pipe 5 through the processing gas introduction pipe 11 is branched into the branch pipes 6 and introduced into the main burner 8 from the branch pipes 6.

  Since the main burner 8 is provided with the flame holding guard 9, the processing gas released from the processing gas ejection hole 8 a of the main burner 8 flows upward along the inner wall of the flame holding guard 9, and the flame holding guard 9. A draft (suction) effect occurs inside.

  On the other hand, since the vertical holes 9 a and 9 b of the flame holding guard 9 are formed with the air holes 9 e, an air flow D toward the inside of the flame holding guard 9 is formed by the draft effect. The air flow D flowing into the flame holding guard 9 from the left and right ventilation holes 9e gathers above the processing gas ejection holes 8a of the main burner 8.

  When the processing gas having a low calorific value is introduced into the main burner 8 with the auxiliary burner 10 ignited in advance in the order of the pilot burner 12 and the auxiliary burner 10 and holding the flame in the auxiliary burner 10, the flame of the auxiliary burner 10 is stabilized. Thus, since the fuel can be ignited reliably by being supplied to each main burner 8, combustion starts without generating combustion vibration.

  Once the main burner 8 is ignited, air is sucked into the flame holding guard 9 through the opening C of the flame holding guard 9 due to the draft effect generated in the flame holding guard 9, and the processing gas ejection holes 8a of each main burner 8 are sucked. The processing gas ejected from the cylinder is ignited to burn the processing gas.

  Even after ignition, external air is taken in from the vent hole 9e of the flame holding guard 9, and the air flow D is guided to the vicinity of the processing gas ejection hole 8a of the main burner 8 as described above. Since the flame is protected by a flame holding guard 9 disposed around the flame, stable combustion of the main burner 8 is maintained.

  Next, another configuration of the ground flare to which the combustion apparatus of the first embodiment is applied will be described with reference to FIG.

  In FIG. 5, the same constituent elements as those in FIG.

  The cylindrical combustion cylinder 2 is supported by a plurality of support columns 17 arranged in a circle on the pedestal 3.

  The lower end of the combustion cylinder 2 is separated from the pedestal 3, whereby an opening A is formed, and air can freely flow into the combustion cylinder 2 through the opening A.

  Next, a configuration for adjusting the amount of air supplied to the main burner 8 will be described with reference to FIG.

  In FIG. 6, a cylindrical skirt 20 is provided in a state along the lower outer peripheral surface of the combustion cylinder 2, and a plurality of air cylinders 21 are provided that move the skirt 20 up and down in the direction of arrow E in a synchronized state. . The skirt 20 and the air cylinder 21 function as an air amount adjusting device.

  The air cylinders 21 are provided at equal intervals in the circumferential direction on the outer wall of the body of the combustion cylinder 2 (in the present embodiment, at 90 ° intervals). Covers the circumference.

  The tube 21 a of the air cylinder 21 is fixed in a direction perpendicular to the outer wall of the body of the combustion cylinder 2, and the tip of the rod 21 b is connected to a bracket 20 a provided on the upper part of the outer wall of the skirt 20.

  When the rod 21b is reduced to the stroke limit, an opening (air intake port) having a height H is formed below the skirt 20, and conversely, when the rod 21b is extended to the stroke limit, it is narrowed to the height H '. A formed opening (air intake) is formed.

  Thus, when the air cylinder 21 is expanded and contracted, the opening height can be changed in the range of H to H ′, and thereby the amount of air taken into the main burner 8 and the auxiliary burner 10 can be adjusted.

  In addition, about the part which interferes with the process gas introduction pipe | tube 11 in the said skirt 20, a U-shaped notch shall be provided and interference shall be avoided.

  In the above-described embodiment, the configuration in which the eight main burners 8 are arranged radially has been described. However, the number of main burners 8 may be more or less. However, the number of the first fuel injection holes 10 b of the auxiliary burner 10 needs to match the number of the main burners 8.

  Further, the number of the processing gas ejection holes 8a of the main burner 8 can be increased or decreased according to the component of the target processing gas.

  Further, the number and diameter of the vent holes 9e provided in the vertical plate portions 9a and 9b of the flame guard 9 can be increased or decreased according to the component of the target processing gas.

  Next, FIGS. 7 to 16 show a configuration when the combustion apparatus of the second embodiment of the present invention is applied to a ground flare.

  In FIG. 7, the ground flare 30 is discharged from the plant into a cylindrical (chimney-shaped) combustion cylinder 31, a plurality of, for example, 13 burner clusters 32 arranged near the ground of the combustion cylinder 31, and each burner cluster 32. A gas supply manifold pipe (processing gas introduction pipe) 33 for supplying the processing gas to be supplied, a cylindrical fence 34 provided concentrically on the outside of the combustion cylinder 31, and an ignition ignition torch 35 I have.

  The combustion cylinder 31 has a structure in which a heat insulating material is applied to the inner surface of the iron skin, and the fence 34 shields the flame light in the combustion cylinder 31, absorbs combustion noise, and maintains the surface temperature of the fence 34 at a low temperature. It has functions such as

  The ground flare 30 is supplied with combustion air by a natural ventilation system.

  FIG. 8 is a plan view showing an example of the arrangement of the burner cluster 32 shown in FIG. 7, and FIG. 9 is a diagram for explaining staging of the burner cluster 32 shown in FIG.

  As shown in FIG. 8, in this example, 13 burner clusters 32 are arranged in a turtle shell shape in the combustion cylinder 31, and each burner cluster 32 includes a plurality of combustion devices arranged radially. (See FIG. 13).

  These burner clusters 32 are grouped into three groups as shown in FIG. 9. When the amount of process gas released from the plant is small, the first stage No. The combustion process by one burner cluster 32 of 1 is performed.

  When the flow rate of the processing gas increases, the second stage valve V2 is detected, and in addition to the one burner cluster 32 of the first stage, the No. 2 of the second stage. 2 is burned by the four burner clusters 32.

  When the flow rate of the processing gas further increases, the third stage valve V3 is detected, and in addition to the five burner clusters 32 of the first and second stages, the No. 3 of the third stage. 3 is burned by the eight burner clusters 32.

  As described above, the staging burner ensures stable combustion operation by performing staging while maintaining good fire transfer performance when the flow rate change range of the processing gas from the plant is wide. ing. In the figure, 36 is a staging header pipe, and 37 is a gas supply header pipe branched from the gas supply manifold pipe 33.

  FIG. 10 is an enlarged side view of the combustion apparatus constituting the burner cluster 32, FIG. 11 is a front view of the combustion apparatus, and FIG.

  As shown in FIGS. 10-12, the combustion apparatus by 2nd embodiment is provided with the cylindrical burner 38 extended in a horizontal direction, The upper side part (near the top part of a surrounding wall) of the burner trunk | drum 38a in the cylindrical burner 38 A plurality of process gas ejection holes 38b for ejecting process gas are provided continuously in the longitudinal direction (axial direction) of the burner body 38a. In addition, a gas pipe connection portion 38c as a processing gas introduction portion is provided at a lower side portion (bottom portion of the peripheral wall) of the central portion of the burner barrel portion 38a.

  In the combustion apparatus of the second embodiment, the processing gas ejection holes 38b are provided in two rows in the longitudinal direction of the burner barrel portion 38a, and ten in series in each row (see FIG. 12).

  A gas supply branch pipe 39 branched from the gas supply header pipe 37 is connected to the gas pipe connection portion 38 c of the cylindrical burner 38. In addition, 39a is a sleeve for pipe connection.

  The combustion apparatus of the second embodiment is mainly composed of the cylindrical burner 38 and a flame holding guard 40 as a flame holder.

  The flame-holding guard 40 includes two vertical plate portions 41 and 41 as two flat plate-shaped flame-holding plates that are opposed to each other with the burner body portion 38a sandwiched from both side surfaces thereof, and the vertical plate portions 41, 41, A plurality of sets of bolts 42 and nuts 43 are fixed to the burner body 38a so that 41 is parallel to each other.

  Specifically, the vertical plate portions 41 and 41 are fixed by three sets of bolts 42 and nuts 43 that are installed directly above the cylindrical burner 38 and two sets of bolts that are installed directly below the cylindrical burner 38. The two vertical plate portions 41 and 41 are detachably attached to the burner body 38a by connecting the vertical plate portions 41 and 41 using the nut 42 and the nut 43.

  The two vertical plate portions 41, 41 are respectively extended over the entire processing gas ejection hole 38b (provided in the longitudinal direction of the burner barrel portion) in the longitudinal direction of the burner barrel portion 38a. In the height direction, it is provided so as to protrude from the burner body 38a upward and downward by a predetermined length.

  That is, while the vertical plate portions 41 and 41 extending upward from the burner body portion 38a protrude with a length sufficient to protect the core of the gas jet (on the downstream side of the air flow). The vertical plate portions 41 and 41 extending downward from the burner barrel portion 38a change the direction of the ambient air flow that has collided with the lower portion of the burner barrel portion 38a to sufficiently disturb the vertical plate portions 41 and 41. It protrudes in the length which can exhibit the effect as a baffle plate which raises along the outer side wall (on the upstream side of the air flow).

  Further, in the vertical plate portions 41, 41, the processing gas ejection holes 38b are provided in the vicinity of the row of the processing gas ejection holes 38b provided in the burner body portion 38a and above (on the downstream side of the air flow). A plurality of vent holes 44 are provided along the rows (see FIGS. 10 and 11).

  By arranging, for example, six combustion apparatuses configured in this manner radially, one burner cluster 32 can be configured as shown in FIG.

  14 is a cross-sectional view for explaining the operation of the combustion apparatus shown in FIG. 10, and FIG. 15 is a cross-sectional view of a cylindrical burner not provided with a vertical plate portion shown for comparison.

  In FIG. 15, in the configuration of only the cylindrical burner 50 that does not include the vertical plate portion 41, the surrounding air flow is engulfed on the downstream side of the air flow in the cylindrical burner 50 (the upper side of the cylindrical burner 50). Since an unstable vortex flow is generated, the flame from the cylindrical burner 50 floats upward from the process gas ejection hole 50a in an irregular state, and a stable flame always anchored to the process gas ejection hole 50a is not formed. As a result, vibration combustion occurs.

  On the other hand, in the combustion apparatus of the second embodiment configured as described above, as shown in FIG. 14, the vertical plate portions 41, 41 arranged opposite to each other in the flame holding guard 40 are arranged from the burner barrel portion 38 a. A predetermined length is projected downward. Therefore, the surrounding air flow that has flowed directly under the burner body 38a collides with the lower surface of the burner body 38a, and its direction is changed by the hanging portions 41a and 41a in the vertical plates 41 and 41, so that the vertical plate It rises along the outer surface of 41,41.

  Thus, since the air flow around the cylindrical burner 38 is once rectified on the upstream side of the cylindrical burner 38, the air flow around the cylindrical burner 38 can be stabilized.

  Further, since the opposed vertical plate portions 41 and 41 protrude above the burner barrel portion 38a by a predetermined length, the surrounding area above the cylindrical burner 38 in the range where the processing gas ejection holes 38b are provided. It is possible to prevent an unstable vortex from being generated due to the entrainment of the air flow.

  Further, since the vertical plate portions 41 and 41 are provided with the plurality of vent holes 44 described above, the ambient air corresponding to the change in the jet speed of the processing gas (change in static pressure) is retained from these vent holes 44. It is taken into the flame guard 40.

  As a result, the vicinity of the processing gas ejection hole 38b of the cylindrical burner 38 is always in a combustible air-fuel mixture state with an appropriate air ratio, and a stable flame always anchored to the processing gas ejection hole 38b can be formed.

  Thus, according to the combustion apparatus of the second embodiment, by providing the vertical plate portions 41, 41, a stable flame can be formed in the vicinity of the processing gas ejection hole 38b, and the processing gas ejection hole can be formed. Even if the flow from 38b fluctuates, the flame of the cylindrical burner 38 is stabilized by the presence of the seed fire at all times, thereby suppressing the combustion vibration.

  Further, the flame holding guard 40 configured to fix the vertical plate portions 41 and 41 to the cylindrical burner 38 with the bolts 42 and the nuts 43 can be easily attached and detached, so that the combustion apparatus It is excellent in soundness and maintainability, which are important points.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front longitudinal sectional view showing a configuration of a ground flare provided with a combustion apparatus according to a first embodiment of the present invention and having a partially cutout. (a) is a top view of the combustion apparatus of 1st embodiment, (b) is a side view, (c) is a front view. It is a top view which shows arrangement | positioning of the combustion apparatus of FIG. 1, and an auxiliary burner. (a) is the top view to which the auxiliary burner of FIG. 1 was expanded, (b) is a front longitudinal cross-sectional view of FIG. 4 (a). FIG. 2 is a view corresponding to FIG. It is a principal part longitudinal cross-sectional view which shows an air quantity adjusting device. It is a front longitudinal cross-sectional view which shows the structure of the ground flare provided with the combustion apparatus of 2nd embodiment of this invention. It is a top view which shows the example of arrangement | positioning of the burner cluster shown in FIG. It is explanatory drawing for demonstrating the staging of the burner cluster shown in FIG. It is a side view which shows the structure of the combustion apparatus of 2nd embodiment of this invention. It is a front view of the combustion apparatus shown in FIG. It is a top view of the combustion apparatus shown in FIG. It is a top view of the burner cluster comprised by arrange | positioning six combustion apparatuses shown in FIG. 10 radially. It is sectional drawing for demonstrating operation | movement of the combustion apparatus shown in FIG. It is sectional drawing of the cylindrical burner which is not provided with a vertical board part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground flare 2 Combustion cylinder 3 Base 4 Duct 5 Vertical pipe | tube 5a Vertical pipe | tube upper part 6 Branch pipe 7 Combustion apparatus 8 Main burner 8a Process gas ejection hole 9 Flame holding guard 9a, 9b Vertical plate part 9c 1st connection plate 9d Second connection plate 9e Ventilation hole 10 Auxiliary burner 10a Disk part 10b First fuel injection hole 10c Second fuel injection hole 10d Third fuel injection hole 11 Process gas introduction pipe 12 Pilot burner 13 Inspection manhole 14 Inspection port 15, 16 Upper duct 17 Strut 20 Skirt 21 Air cylinder 30 Ground flare 31 Combustion cylinder 32 Burner cluster 33 Gas supply manifold pipe 34 Fence 35 Ignition torch 36 Staging header pipe 37 Gas supply header pipe 38 Cylindrical burner 38a Burner body 38b Process gas ejection hole 38c Gas pipe connection part 39 Gas supply Branch pipe 40 Flame holding guard 41 Vertical plate part 42 Bolt 43 Nut

Claims (11)

In a combustion apparatus of a ground flare that introduces a processing gas into a combustion cylinder through a processing gas introduction pipe and burns the processing gas by a plurality of combustion apparatuses in the combustion cylinder.
The combustion device is
A tubular burner which is arranged in a substantially horizontal direction and has a plurality of processing gas ejection holes arranged at the top;
A flame guard for protecting the flame from the processing gas ejection hole,
The flame holding guard is provided in the longitudinal direction of the burner corresponding to the range in which the processing gas ejection holes are arranged, and protrudes at least upward from each side wall of the burner. Combustion device characterized.   The combustion apparatus according to claim 1, wherein the flame holding guard is provided with a vent hole.   The combustion apparatus according to claim 1 or 2, wherein the flame holding guard is arranged in a window frame shape so as to surround a flame train formed on the processing gas ejection hole.   When the processing gas is injected from the processing gas ejection hole, the inside of the flame holding guard is depressurized, and air outside the flame holding guard is sucked into the flame holding guard from the vent hole. The combustion apparatus according to claim 3.   The combustion apparatus according to claim 1, wherein the flame holding guard protrudes downward from each side wall of the burner.   The combustion apparatus according to any one of claims 1 to 5, wherein flame holding guards protruding from each side wall of the burner are fixed to the burner via bolts.   The combustion apparatus according to any one of claims 1 to 6, further comprising an auxiliary burner for assisting combustion of the burner.   An opening for introducing the flame of the auxiliary burner into the flame holding guard into the flame holding guard arranged in a window frame shape so as to surround the periphery of the flame row formed on the processing gas ejection hole The combustion apparatus according to claim 7, wherein:   Each of the combustion devices is arranged on a virtual line extending radially from the center of the combustion cylinder, the auxiliary burner is arranged at the center thereof, and the plurality of fuel injection holes of the auxiliary burner are respectively opposed to the openings. The combustion apparatus according to claim 8, which is disposed in   The combustion according to any one of claims 1 to 9, wherein an auxiliary combustion gas supply pipe for supplying an auxiliary combustion gas for increasing the calorific value of the processing gas is connected to the processing gas introduction pipe via an on-off valve. apparatus. A combustion apparatus according to any one of claims 1 to 10,
A ground flare comprising an air amount adjusting device for adjusting the amount of air supplied to the burner.

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