WO2018010048A1 - Ignition device with ejector-type combustion device - Google Patents

Abstract

An ignition device with an ejector-type combustion device comprises an ejector-type combustion device. The ejector-type combustion device comprises a plurality of layers of first venturi burners (10), an ignition device (14) being provided near each layer of the first venturi burners (10) for igniting the first venturi burners (10). The ignition device comprises an ignition structure (32), a thermocouple (34) and an igniter (36). A fixing structure (38) is provided on the ignition structure (32) for fixing the ignition device (14) onto the ejector-type combustion device, and the thermocouple (34) and the igniter (36) are fixed onto the fixing structure (38), the thermocouple (34) being used for detecting the temperature of the ignition structure (32), and the igniter (36) being used for igniting the ignition structure (32).

Description

 Ignition device for ejector burner

 Technical field

 [0001] The present invention relates to an ignition device, and more particularly to an ignition device for an ejector combustion device.

 Background technique

 [0002] In a petrochemical plant, the venting flare system can process excess, harmful, unbalanced exhaust gases emitted from the production plant, and can handle unqualified gases generated by commissioning, parking, and accidents. A large amount of gas ensures normal and safe operation of the unit. Torch combustion should maintain the stability of the flame. If the fuel gas in the burner cannot be ignited, it will cause a large amount of toxic, corrosive, flammable and explosive gas to overflow and spread, which will not only pollute the environment, but also cause serious explosions. Fire. Moreover, the fuel gas in the burner cannot be ignited and the combustion rate is greatly reduced, which adversely affects the normal operating process of the flare combustion system.

 [0003] The ignition device of the torch is very important. If the torch that needs to be ignited cannot be ignited, and it will not be discovered, it will have serious consequences. The existing torch ignition device, igniter and temperature measuring thermocouple are separately installed, the comprehensive performance is poor, the installation is complicated, the cost is high, and the thermocouple is installed close to the flame, and the baking life of the flame is short.

 technical problem

 In view of the above, the present invention provides an ignition device for an ejector-type combustion device having high reliability, long maintenance without maintenance, and long life.

 Problem solution

 Technical solution

[0005] An ignition device for an ejector type combustion apparatus, comprising an ejector type combustion device, the ejector type combustion device comprising a plurality of first venturi burners, each of which is disposed adjacent to the first venturi burner An ignition device for igniting the first venturi burner, the ignition device comprising an ignition structure, a thermocouple and an igniter, the ignition structure being arranged to fix the ignition device to the bow-I burner The upper fixed structure, the thermocouple and the igniter are fixed on the fixed structure, the thermocouple is used to detect the temperature of the ignition structure, and the igniter is used to ignite the ignition structure. [0006] In an embodiment, the ejector-type combustion apparatus includes a plurality of protective hoods arranged in a vertical direction, each of the shields being closed in a circumferential direction to form a flame chamber having upper and lower jaw ends, in a vertical In the two adjacent shields in the straight direction, the radial width of the upper shield is greater than the radial width of the next layer, so that a fluid communication with the flame chamber is formed between the adjacent two shields. An ejector region, wherein the plurality of first venturi burners are correspondingly disposed between the adjacent two layers of shields and such that an upper portion of the first venturi burner extends into the ejector region, An ignition device is disposed outside of each of the shields.

 [0007] In an embodiment, the ignition structure is a second venturi burner, the second venturi burner includes a venturi, a nozzle and a flame holder, and the venturi has an intake end And an outlet end, the nozzle is disposed at the inlet end, and the flame holder is disposed at the outlet end.

 In one embodiment, each of the first venturi burners is provided with two ignition devices, the two ignition devices being symmetrically distributed about a central axis of the ejection combustion device.

 In one embodiment, the venturi is bent at the end of the tube toward the first venturi burner such that the flame holder is adjacent to the first venturi burner corresponding thereto. Air port.

 [0010] In one embodiment, each of the layers of the shroud is provided with a rake, and a curved portion of the second venturi burner extends into the rake to ignite the first venturi burner.

 [0011] In an embodiment, the fixing structure is a flange, and the flange is fixed at an upper edge of the bending portion.

And the flange is perpendicular to the upper portion of the venturi tube, and the thermocouple and the igniter are vertically fixed to the flange.

 [0012] In an embodiment, the igniter has an ignition nozzle, and the ignition nozzle is opposite to the flame holder outlet

[0013] In an embodiment, the thermocouple has an inductive end, and the inductive end is disposed adjacent to the flame holder.

 [0014] In an embodiment, the thermocouple is electrically connected to a main control system of the ejector combustion device.

 Advantageous effects of the invention

 Beneficial effect

[0015] In summary, the present invention provides an ignition device for an ejector type combustion device, the igniter device is disposed outside the shield, the ignition device includes an ignition structure, a thermocouple and an igniter, and a fixed structure is disposed on the ignition structure. The structure, thermocouple and igniter are fixed on the fixed structure, and the thermocouple is used to detect the temperature of the ignition structure. And the measured temperature is fed back to the main control system. If the ignition is not successful, the thermocouple does not detect the temperature, and the main control system will quickly find out that it can be used to ignite the ignition structure. By arranging the ignition device outside the protective cover, the thermocouple is prevented from being shortened due to too close to the flame, and the ignition structure, the thermocouple and the igniter are installed in a centralized manner, the installation is convenient, the reliability is high, and the cost is reduced. .

 Brief description of the drawing

 DRAWINGS

 1 is a schematic view showing the overall structure of an ejector combustion apparatus.

2 is a cross-sectional view of FIG. 1.

 3 is a schematic view showing the connection of an ignition device and an ejector combustion device.

4 is a schematic structural view of an ignition device.

Embodiments of the invention

 [0020] Before the embodiments are described in detail, it is understood that the invention is not limited to The invention may be embodied in other ways. Further, it should be understood that the phraseology and terminology used herein are for the purpose of description The words "including", "comprising", "having", and the like, are used in this context to include the items listed thereafter, their equivalents, and other additional items. In particular, when describing "a certain component", the present invention does not limit the number of the components to one, and may include a plurality.

 [0021] As shown in FIGS. 1 to 3, the ejector combustion apparatus includes a plurality of first venturi burners 10, which are arranged around a plurality of first venturi burners 10 and axially along the ejector burners. A layer shield 12, and an ignition device 14 disposed adjacent the plurality of first venturi burners 10 for igniting the plurality of first venturi burners 10.

[0022] The multi-layered protective cover 12 includes four protective covers, a first protective cover 16, a second protective cover 18, a third protective cover 20, and a fourth protective cover 22, each of which is The circumference is closed to form a flame chamber having upper and lower jaw ends. In the two layers of the protective cover adjacent in the vertical direction, the radial width of the upper protective cover is greater than the radial width of the lower layer so that a fluid communication with the flame cavity is formed between the adjacent two protective covers. Ejection zone. For example, for the first protective cover 16 and the second protective cover 18, the second protective cover 1 The radial width of the first shield 16 is greater than the radial extent of the first shield 16, and an ejector region is formed between the two shields in fluid communication with the flame chamber. In other embodiments, at least one protective cover may be disposed outside the fourth layer of the shield 22.

 [0023] The outer peripheral surface of at least one of the lower shields is evenly distributed with a plurality of first venturi burners 10 spaced apart in the circumferential direction. In the illustrated embodiment, the plurality of first venturi burners 10 include four layers of venturi burners, a first layer first venturi burner 24, a second layer first venturi burner 26, a third The first venturi burner 28 and the fourth first venturi burner 30. Wherein, the first layer of the first venturi burner 24 is disposed inside the first layer of the shield 16, and the second layer of the first venturi burner 26 is disposed on the outer peripheral surface of the first layer of the shield 16 and spaced along the circumferential direction thereof. The third layer first venturi burners 28 are disposed on the outer circumferential surface of the second layer shield 18 and are circumferentially spaced apart, and the fourth layer first venturi burner 30 is disposed on the third layer shield 20 The outer peripheral surfaces are distributed along the circumferential direction thereof, and the upper portions of the second, third and fourth layers of the first venturi burner respectively extend into the corresponding ejection regions to make the second, third and fourth layers of the first venturi burner The resulting flame is obscured at least in the horizontal direction by the immediately adjacent upper shield. In other embodiments, the first venturi burner may be placed on more or less continuous continuous layers or a layer of hood.

 [0024] As shown in FIG. 3, an annular first air supply duct is disposed outside each of the shields, and an intake end of the first venturi burner of each layer is in communication with a corresponding first air supply duct. Ignition device 14 is disposed on the outside of each of the shields, and each of the first venturi burners is provided with two ignition devices 14, in the illustrated embodiment, two ignition devices 14 of each layer are associated with said ejector combustion The central axis of the device is symmetrically distributed. In other embodiments, each of the first venturi burners may be provided with an ignition device 14 or more than two ignition devices 14. The arrangement of the ignition devices 14 is arranged according to design requirements.

[0025] Each of the shields is further provided with a semi-annular second air supply duct, and the second air supply duct of each layer communicates with the air intake end of the ignition device ₁₄ outside each layer of the shield to supply air. A locking structure 15 for fixing the ignition device 14 is further disposed outside each of the protective covers. The locking structure 15 is fixed to the protective cover at one end and fixedly connected to the ignition device 14 at the other end. In this embodiment, each of the ignition devices 14 is fixed by two locking structures 15, and in other embodiments, the locking structures 15 may be other numbers.

Referring to FIG. 4, the ignition device 14 includes an ignition structure 32, a thermocouple 34, and an igniter 36. The ignition structure 32 is provided with a fixing structure 38 for fixing the ignition device 14 to the bow-and-eye combustion device. The even 34 and igniter 36 are fixedly mounted to the fixed structure 38. Main control of thermocouple 34 and ejector burner The system is electrically connected, the thermocouple 34 is used to detect the temperature of the ignition structure 32, and the measured temperature is fed back to the main control system. If the ignition is not successful, the thermocouple 34 does not detect the temperature, or the detected temperature does not reach the pre-predetermined temperature. Set the value, the main control system will soon find out, and then deal with it. Igniter 36 is used to ignite ignition structure 32.

 [0027] In the illustrated embodiment, the ignition structure 32 is a second venturi burner 32, the second venturi burner 32 includes a venturi 40 and a flame holder 44, and the venturi 40 has an intake end 46. And the air outlet end 48, the flame holder 44 is disposed at the air outlet end 48.

 [0028] Each of the shields is provided with a rake 50 corresponding to the position of the second venturi burner 32. The venturi 40 is bent at its body end toward the first venturi burner 10 such that the flame holder 4 of the second venturi burner 32 is adjacent to the outlet vent 52 of a first venturi burner corresponding thereto. Specifically, the bent portion of the second venturi burner 32 extends into the corresponding port 50 to ignite a corresponding first venturi burner.

 [0029] The lower end of the second venturi burner 32 is provided with a semi-annular second air supply duct 33, and the intake end of the second venturi burner 32 is in communication with the second air supply duct 33, and the second air supply duct 33 It is used to supply gas to the second venturi burner 32, and the same function to support the second venturi burner 32.

 [0030] In the illustrated embodiment, the locking structure 15 is fixedly coupled to the venturi 40. Specifically, one of the two locking structures 15 is fixedly coupled to the lower edge of the bent portion of the venturi 40, and the other locking structure 15 is fixedly coupled to the lower position of the venturi 40 to secure the ignition device. Set aside.

 [0031] The fixing structure 38 is a flange 38 fixed to the upper edge of the bent portion of the venturi 40, and the flange 38 is perpendicular to the body of the venturi 40, the thermocouple 34 and the igniter 36 is vertically fixed to the flange 38. The thermocouple 34 has an inductive end 54 that is disposed adjacent the second venturi burner 32 flame holder 44 to sense its temperature. The igniter 36 has an ignition nozzle 56 that faces the flame holder 44 for ignition. Nozzle 56 is facing the outlet end of flame holder 44 to ignite it.

 [0032] The top end of the flame holder 44 of the second venturi burner 32 and the lower end of the venturi 40 are provided with a plurality of small holes. The small hole 58 is disposed at the top end of the flame holder 44 in order to increase the clogging ratio of the flame holder 44, so that the vortex scale formed by the flame expander 44 is increased, and the large eddy is separated from the turn, and the unburned mixed gas is sufficiently ignited. The combustion stability is enhanced, which is beneficial for igniting the first venturi burner; a small hole 60 is arranged at the lower end of the venturi tube 40 to absorb the air mixed combustion, increase the air-fuel ratio, and ensure the full combustion of the gas.

[0033] In summary, the present invention provides an ignition device for an ejector-type combustion device, which is disposed in the defense On the outside of the shield, the ignition device includes an ignition structure, a thermocouple and an igniter, a fixed structure is arranged on the ignition structure, a thermocouple and an igniter are fixed on the fixed structure, and a thermocouple is used to detect the temperature of the ignition structure, and the measurement is performed. The temperature is fed back to the main control system. If the ignition is not successful, the thermocouple does not detect the temperature. The main control system will quickly find out that it can be used to ignite the ignition structure. By arranging the ignition device outside the protective cover, the thermocouple is prevented from being shortened due to too close to the flame, and the ignition structure, the thermocouple and the igniter are installed in a centralized manner, the installation is convenient, the reliability is high, and the cost is reduced. .

 The concepts described herein may be embodied in other forms without departing from the spirit and scope. The specific embodiments disclosed are to be considered as illustrative and not restrictive. Therefore, the scope of the invention is to be determined by the appended claims rather Any changes which come within the meaning and range of the claims are intended to be within the scope of the claims.

Claims

Claim An ignition device for an ejector combustion apparatus, comprising an ejector combustion device, the ejector combustion device comprising a plurality of first venturi burners, each layer of the first venturi burner being provided for igniting The ignition device of the first venturi burner, characterized in that the ignition device comprises an ignition structure, a thermocouple and an igniter, and the ignition structure is arranged to fix the ignition device to the bow-and-fire type A fixed structure on the device, the thermocouple and igniter are fixed to the fixed structure, the thermocouple is used to detect the temperature of the ignition structure, and the igniter is used to ignite the ignition structure. An ignition device for an ejector type combustion apparatus according to claim 1, wherein said lance type blasting apparatus comprises a plurality of hoods arranged in a vertical direction, each of which is closed in the circumferential direction Forming a flame chamber having upper and lower jaw ends, wherein the vertical width of the upper shield is greater than the radial width of the next layer in the two vertical shields adjacent to each other, so that the adjacent two shields Forming an ejector region in fluid communication with the flame chamber, the plurality of first venturi burners being correspondingly disposed between the adjacent two layers of shields and causing the first venturi burner An upper portion extends into the ejection area, and the ignition device is disposed outside the protective cover of each layer. The ignition device of the ejector type combustion apparatus according to claim 2, wherein said ignition structure is a second venturi burner, and said second venturi burner comprises a venturi, a nozzle, and a flame-proofing The venturi has an intake end and an outlet end, the nozzle is disposed at the intake end, and the flame holder is disposed at the outlet end. An ignition device for an ejector type combustion apparatus according to claim 3, wherein each of said first venturi burners is provided with two ignition means, said two ignition means being said about said ejector type combustion means The central axis is symmetrically distributed. An ignition device for an ejector type combustion apparatus according to claim 4, wherein said venturi is bent toward said first venturi burner at a tube end thereof such that said flame holder is close to Corresponding to the outlet of the first venturi burner. An ignition device for an ejector-type combustion apparatus according to claim 5, wherein each of said shields is provided with a weir, and a curved portion of said second venturi burner extends into said The mouth is said to ignite the first venturi burner.  [Claim 7] The ignition device of the ejector type combustion apparatus according to claim 5, wherein the fixing structure is a flange, and the flange is fixed at an upper edge of the bending portion, and The flange is perpendicular to the upper portion of the venturi tube, and the thermocouple and the igniter are vertically fixed to the flange.  [Claim 8] The ignition device of the ejector combustion apparatus according to claim 7, wherein the igniter has an ignition nozzle, and the ignition nozzle faces the flame arrester outlet end. [Claim 9] The ignition device of the ejector type combustion apparatus according to claim 7, wherein the thermocouple has an inductive end, and the inductive end is disposed at a position close to the flame holder. The ignition device of the ejector type combustion apparatus according to claim 1, wherein the thermocouple is electrically connected to a main control system of the ejector type combustion apparatus.