CN216693637U

CN216693637U - Ignition equipment

Info

Publication number: CN216693637U
Application number: CN202123088103.2U
Authority: CN
Inventors: 何磊; 杨海永; 陈尚彬; 方可宁; 曾磊赟; 李想; 谭玲; 张静
Original assignee: Shanghai Qiyao Thermal Energy Engineering Co ltd; Shanghai Marine Diesel Engine Research Institute
Current assignee: Shanghai Qiyao Thermal Energy Engineering Co ltd; 711th Research Institute of CSIC
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-06-07
Anticipated expiration: 2031-12-09

Abstract

The utility model discloses ignition equipment, which comprises a premixing part for mixing fuel gas and combustion-supporting gas, wherein the premixing part is connected with a fuel gas channel and a combustion-supporting gas channel. A premixing cavity is arranged in the premixing part, and the combustion-supporting gas channel is communicated with the premixing cavity. The premixing cavity is provided with at least one fuel gas spraying pipe and a mixing communicating part. The fuel gas spray pipe is communicated with the fuel gas channel and is arranged along the axial direction. Mix the intercommunication and be farther away from ignition equipment's end for the fuel gas spray tube, mix the intercommunication and seted up at least one venturi channel along the axial, the quantity of venturi channel corresponds with the quantity of fuel gas spray tube, and the entry end of venturi channel is relative with the exit end of fuel gas spray tube. According to the ignition device, the mixing efficiency of the fuel gas and the combustion-supporting gas can be improved, so that the fuel gas and the combustion-supporting gas can be mixed more fully and can be uniformly mixed even at a high flow rate.

Description

Ignition equipment

Technical Field

The utility model relates to the technical field of chemical industry, in particular to ignition equipment.

Background

The ignition burner is an important component of combustion equipment such as an incinerator, a gasification furnace and the like, and is mainly used for establishing stable ignition flame so as to ignite a high-power main burner. For large-scale burning equipment of fuel oil or coal, the ignition burner can also be used as an incandescent lamp, used for drying refractory bricks, heating a combustion chamber and used as auxiliary burning equipment for stabilizing main burning flame. Therefore, the ignition burner with good performance has the characteristics of reliable ignition performance, stable combustion state, compact structure, no occupation of the installation space of the main combustion equipment and the like.

However, some current ignition burners generally have the following problems:

1. limited by the overall dimension, the combustion power of the ignition burner is generally lower, and the flame length is shorter. When the burner is used as a pilot burner, especially under the condition of adopting hydrogen-rich fuel, the heat generated by combustion is mostly concentrated at the outlet area of the burner, and cannot be transmitted to the whole hearth, so that the temperature distribution in the furnace is easy to be uneven.

2. Under the high-power working condition, because the air velocity is higher, the fuel gas and the combustion-supporting gas are not fully mixed, so that the flame rigidity and the stability are poorer. When the combustion load changes or fluctuates, the phenomenon that flame is extinguished or even extinguished easily occurs;

3. the flame detection system is unreliable, and when the ignition nozzle is operated for a long time, the interlocking parking of the equipment is easily caused due to flame signal loss caused by reasons of flame detection visual field obstruction, flame separation from a flame detection area, carbon deposition and coking of a probe and the like.

Therefore, there is a need for an ignition device that at least partially addresses the above problems.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content of the present invention is not intended to define key features or essential features of the claimed solution, nor is it intended to be used to limit the scope of the claimed solution.

In order to at least partially solve the above problems, the present invention provides an ignition device, including a premixing portion for mixing fuel gas and combustion-supporting gas, the premixing portion being connected to a fuel gas passage and a combustion-supporting gas passage, the premixing portion having a premixing chamber therein, the combustion-supporting gas passage being communicated with the premixing chamber, the premixing chamber being provided with:

at least one fuel gas spray pipe, wherein the fuel gas spray pipe is communicated with the fuel gas channel and is arranged along the axial direction;

mix the intercommunication portion, mix the intercommunication portion for the fuel gas spray tube is farther away from ignition equipment's end, mix the intercommunication portion and follow at least one venturi channel has been seted up to the axial, the quantity of venturi channel with the quantity of fuel gas spray tube corresponds, just the entry end of venturi channel with the exit end of fuel gas spray tube is relative.

According to the ignition device, the mixing efficiency of the fuel gas and the combustion-supporting gas can be improved, so that the fuel gas and the combustion-supporting gas can be mixed more fully and can be uniformly mixed even at a high flow rate.

Further, the air conditioner is provided with a fan,

at least one swirl device is disposed within the premix chamber, the swirl device being further from the tip of the ignition apparatus relative to the venturi channel; and/or

At least two swirling devices are arranged in the premixing cavity, are arranged at intervals along the axial direction of the premixing part and are far away from the tail end of the ignition device relative to the Venturi channel, and the flow cross-sectional areas of the at least two swirling devices decrease progressively along the direction far away from the tail end. Thereby, the mixing time can be prolonged, and the fuel gas and the combustion-supporting gas can be more fully mixed.

Further, the ignition equipment further comprises an extending part used for conveying mixed gas, the extending part is communicated with the premixing part, a fluid uniform distribution device is arranged in the extending part and located at the joint of the extending part and the premixing part, and the fluid uniform distribution device is provided with first through honeycomb holes which are uniformly distributed.

Further, the end of the extending part, which is far away from the premixing part, is provided with a fire retardant device, and the fire retardant device is provided with uniformly distributed second through honeycomb holes.

Further, the air conditioner is provided with a fan,

the aperture of the second through honeycomb hole is smaller than that of the first through honeycomb hole; and/or

The aperture of the second through honeycomb holes is less than or equal to 3 mm.

Further, the ignition device further comprises a combustion portion for combustion and flame injection of the mixture, the combustion portion being in communication with the extension portion, the combustion portion having an injection port, the combustion portion being provided with:

the flame stabilizing device is provided with a flame stabilizing blunt body and a connecting part, the flame stabilizing blunt body is arranged facing the jet orifice, and the connecting part is connected between the flame stabilizing blunt body and the fire retardant device;

ignition, ignition follows axial extension and with flame holding device separates, ignition runs through back-fire relief device, just ignition is located flame holding blunt body's side or run through flame holding blunt body. Therefore, a high-temperature backflow area can be formed on one side, facing the jet orifice, of the flame stabilizing bluff body so as to ignite the mixed gas flowing through the flame stabilizing bluff body from the upstream, and the stability of flame is improved.

Further, the combustion section includes:

an expansion section connected to the extension portion and having an increasing inner diameter in a direction away from the extension portion;

a constant diameter section connected to the expanding section, the constant diameter section having an inner diameter that is axially equal;

the contraction section is connected to the equal-diameter section, the inner diameter of the contraction section is gradually reduced along the direction far away from the extension part, and the flame stabilizing bluff body is positioned at the contraction section and is arranged close to the equal-diameter section; and

an outlet section connected to the convergent section, the outlet section having an inner diameter that is axially equal and smaller than an inner diameter of the constant diameter section, an end of the outlet section being configured as the jet port.

Further, the combustion portion still is provided with temperature-detecting device, temperature-detecting device follows the axial sets up, and runs through back-fire relief device and extend to the expansion section.

Further, one of the venturi passages and one of the fuel gas injection pipes are disposed along a central axis of the premixing portion.

Further, at least two venturi passages and at least two fuel gas injection pipes are arranged along the circumferential direction and are centrosymmetric with respect to the central axis of the premixing part.

Further, the combustion part still is provided with probe-type flame detection device, probe-type flame detection device follows the axial sets up, runs through back-fire relief device, probe-type flame detection device is located the side of flame stabilizing bluff body or run through the flame stabilizing bluff body, and probe-type flame detection device extends to export department.

Further, the ignition device the end is provided with image type flame detection device, be provided with the collection passageway in the ignition device, the one end of collection passageway with image type flame detection device butt joint, the other end of collection passageway is followed the axis extends to run through the extension with the flame stabilizing device and communicate to the combustion portion, ignition device still is provided with sweeps the passageway, sweep the passageway with the collection passageway intercommunication, with to let in and sweep gas in the collection passageway. According to the scheme, the combustion condition can be monitored by utilizing the image type flame detection device, and the visual field can not be shielded.

Further, a spray head is arranged at the end of the fuel gas spray pipe, and the spray opening of the spray head is in a petal shape or a swirl vane shape. This improves the momentum exchange between the fuel gas and the combustion-supporting gas.

Further, the area of the nozzle orifice is smaller than the sectional area of the throat portion of the venturi passage.

Drawings

The following drawings of the utility model are included to provide a further understanding of the utility model. The drawings illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model.

In the drawings:

fig. 1 is a schematic perspective view of an ignition device according to a first preferred embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the ignition apparatus of FIG. 1;

FIG. 3 is an enlarged, fragmentary schematic view of a combustion portion of the ignition apparatus of FIG. 2;

fig. 4 is a partially enlarged schematic view of a combustion portion of an ignition device according to a second preferred embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of an ignition device according to a third preferred embodiment of the present invention;

fig. 6 is a partially enlarged schematic view of a combustion portion of an ignition device according to a fourth preferred embodiment of the present invention;

FIG. 7 is a schematic structural view of a spray head of a fuel gas spray tube according to an alternative embodiment of the present invention; and

FIG. 8 is a schematic structural view of a spray head of a fuel gas spray lance in accordance with another alternative embodiment of the present invention.

Description of reference numerals:

100: the ignition device 110: the premixing section 111: end tip

112: the fuel gas passage 113: oxidant gas passage 114: premixing cavity

116: fuel gas lance 117: the spray head 118: nozzle orifice

119: mixed communicating portion 120: venturi passage 121: throat part

122: the swirling device 123: the acquisition channel 124: image type flame detection device

125: purge passage 130: the extension 131: fluid uniform distribution device

132: fire barrier 133: fixing part 140: combustion section

141: the expanding section 142: equal-diameter section 143: contraction section

144: the outlet section 145: injection port 146: flame stabilizing device

147: flame holding bluff body 148: connecting part 149: ignition device

150: temperature detection device 151: probe type flame detection device

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the utility model.

In the following description, a detailed description will be given in order to thoroughly understand the present invention. It is understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. It is apparent that the implementation of the embodiments of the utility model is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the utility model, however, the utility model is capable of other embodiments in addition to those detailed.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Ordinal words such as "first" and "second" are referred to herein merely as labels, and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component". It is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used herein for purposes of illustration only and are not limiting.

An exemplary embodiment according to the present invention will now be described in more detail with reference to fig. 1 to 8.

First preferred embodiment

Fig. 1, 2 and 3 show a first preferred embodiment of the present invention. Wherein the ignition device 100 includes a premixing portion 110, an extension portion 130 and a combustion portion 140. The premixing part 110 is used for mixing fuel gas and oxidant gas, and is provided with a fuel gas passage 112 and an oxidant gas passage 113. The combustion section 140 is used for combustion of the mixture and flame injection. The extension 130 is connected between and in communication with the premixing section 110 and the combustion section 140.

The premixing part 110 may be installed outside the incinerator, the gasifier, and the like. The extension part 130 is used to extend into the above-mentioned incinerator, gasifier, etc., and plays a role of transition and gas mixing. The connection of extension 130 and premix section 110 is provided with a fixing portion 133, for example fixing portion 133 may be configured as a mounting flange. The ignition device 100 may be fixed to the incinerator, gasifier, or the like through the mounting flange.

Premix section 110 has a premix chamber 114 therein. At least one fuel gas lance 116 and mixing connection 119 are disposed within premix chamber 114. Wherein, the combustion-supporting gas channel 113 is communicated with the premixing cavity 114, and the fuel gas spray pipe 116 is communicated with the fuel gas channel 112. The fuel gas nozzles 116 are axially disposed.

The mixing connection 119 is provided downstream of the fuel gas lance 116. Or, more remotely from the end 111 of the ignition device 100 relative to the fuel gas lances 116. The mixing connection portion 119 is axially provided with at least one venturi channel 120, the number of the venturi channels 120 corresponds to the number of the fuel gas nozzles 116, and the inlet end of the venturi channel 120 is opposite to the outlet end of the fuel gas nozzle 116.

According to the ignition device 100 of the present invention, the mixing efficiency of the fuel gas and the oxidant gas can be improved, so that the fuel gas and the oxidant gas can be more sufficiently mixed, and can be uniformly mixed even at a high flow rate.

Preferably, premix chamber 114 is provided with only one fuel gas lance 116 and mixing connection 119 is provided with only one venturi channel 120, both of which are provided along the central axis of premix section 110.

Optionally, the premix chamber 114 is provided with at least two fuel gas lances 116, and the mixing connection 119 is provided with a corresponding number of venturi passages 120. For example, three fuel gas lances 116 and three venturi passages 120, four fuel gas lances 116 and four venturi passages 120, five fuel gas lances 116 and five venturi passages 120, six fuel gas lances 116 and six venturi passages 120, seven fuel gas lances 116 and seven venturi passages 120, eight fuel gas lances 116 and eight venturi passages 120, and so on. This can further improve the momentum exchange efficiency, improve the mixing uniformity, and improve the flow rate.

Also, the at least two venturi passages 120 and the at least two fuel gas lances 116 are circumferentially disposed and are centrosymmetrically arranged with respect to a central axis of the pre-mix section 110.

Referring to fig. 2, 7 and 8, the fuel gas injection pipe 116 is provided at an end thereof with a nozzle 117, and the nozzle holes 118 of the nozzle 117 are formed in a petal shape, so that the boundary of the fuel gas injected from the nozzle holes 118 is wrinkled, increasing the mixing area of the fuel gas and the oxidant gas. Alternatively, the nozzles 118 of the spray head 117 may also be configured as swirl vanes. This improves the momentum exchange between the fuel gas and the combustion-supporting gas.

Preferably, the area of the jet 118 is less than the cross-sectional area of the throat 121 of the venturi passage 120. Therefore, the turbulent diffusion effect of the fuel gas jet flow can be utilized to fully mix the fuel gas and the combustion-supporting gas in the Venturi tube, and the mixing efficiency of the fuel gas and the combustion-supporting gas is improved.

Referring to FIG. 2, at least one swirler 122 is disposed within the premix chamber 114, and the swirler 122 is disposed downstream of the venturi passage 120, or downstream of the mixing connection 119. That is, the swirling device 122 is further from the tip 111 of the ignition device 100 relative to the venturi passage 120. In the illustrated embodiment, one swirling device 122 is provided.

In embodiments not shown, at least two swirling devices 122, such as two, three, or four, etc., may be disposed within the premix chamber 114 to create a staged swirl. Also, at least two swirling devices 122 are spaced apart in an axial direction of the premixing portion 110 and are further away from the tip 111 of the ignition device 100 with respect to the venturi passage 120, and a flow cross-sectional area of the at least two swirling devices 122 decreases in a direction away from the tip 111. Therefore, the mixing time can be prolonged, the mixing area is increased, and the fuel gas and the combustion-supporting gas are mixed more fully. Optionally, the number of swirl openings on at least two swirl devices 122 decreases in a direction away from the tip 111. So as to further prolong the mixing time and improve the mixing area.

The extending portion 130 is provided with a uniform distribution device 131, and the uniform distribution device 131 is provided with first through honeycomb holes which are uniformly distributed, so as to ensure that the mixed gas flowing into the extending portion 130 is uniformly distributed. The flow equalization device 131 is located at the junction of the extension 130 and the premix section 110.

A flame arrestor 132 is also provided within the extension 130 to avoid flashback during low load conditions or during periods of shutdown. A flame arrestor 132 is located at an end of extension 130 distal to premix section 110. Alternatively stated, flame arrestor 132 and fluid distribution 131 are located at each end of extension 130.

The fire retardant device 132 is provided with second through honeycomb holes which are uniformly distributed. The uniformly distributed second through-honeycomb holes are preferably configured as small-diameter dense holes so that the mixed gas can pass through while preventing backfire. Preferably, the second through-honeycomb holes have a smaller pore size than the first through-honeycomb holes. Further preferably, the second through-honeycomb holes have a pore size of less than or equal to 3 mm.

Referring to fig. 3, the combustion part 140 includes an expanding section 141, a constant diameter section 142, a contracting section 143, and an outlet section 144 in order in a direction away from the extension part 130. Wherein the expanding section 141 interfaces with the extending portion 130. The inner diameter of the extension portion 130 is gradually increased along the direction away from the extension portion, and the extension portion is trumpet-shaped. The constant diameter section 142 is connected to the expanding section 141, and has an inner diameter that is constant in the axial direction, or the expanding section 141 is configured in a cylindrical tube shape having the same inner diameter at each location. The constricted section 143 is connected to the constant diameter section 142, the inner diameter of which decreases in a direction away from the extension 130. The outlet section 144 is connected to the convergent section 143, the inner diameter of the outlet section 144 is equal in the axial direction, and the inner diameter of the outlet section 144 is smaller than that of the equal diameter section 142, and the end of the outlet section 144 is configured as an injection port 145.

The combustion unit 140 is provided therein with a flame holder 146, an igniter 149, and a probe-type flame detector 151. The flame holding device 146 includes a flame holding bluff body 147 and a connecting portion 148. The flame holding bluff body 147 is located at the constricted section 143, faces the injection port 145, and is disposed near the constant diameter section 142. A connection 148 is connected between the flame holding bluff body 147 and the flame arrestor device 132. Alternatively, the flame holding bluff body 147 is secured to the flame arrestor device 132 by a connector 148.

Preferably, the flame holding bluff body 147 may be coaxially disposed with the combustion part 140. It will be readily appreciated that the area of the flame holding bluff body 147 is significantly less than the radial cross-sectional area of the combustion section 140. For example, the area of the flame holding bluff body 147 may be 10% to 90%, preferably 30% to 70%, more preferably 40% to 60%, of the radial cross-sectional area of the combustion section 140.

Thereby, a stable high temperature backflow region can be formed at the flame holding bluff body 147 so that the mixture gas from the extension portion 130 can be continuously ignited therein, improving the stability of the flame. Specifically, the flame holding bluff body 147 is a solid plate, and the high-speed mixed gas flow can be decelerated and redirected to some extent at the solid plate, so that a low-pressure backflow region is more easily formed at one side of the flame holding bluff body 147 facing the injection port 145, and high-temperature flue gas generated by the combustion of the mixed gas flows back to the backflow region at the flame holding bluff body 147. The backflow of the high-temperature flue gas enables the gas in the area to have high temperature, the stable high-temperature area can continuously ignite the mixed gas ejected from the upstream, flame can be stably combusted, and the phenomenon of fire escaping can not occur when high-power operation is performed.

Preferably, the flame holding bluff body 147 and the connecting portion 148 may be connected by a screw thread or welding. In addition, the flame holding bluff body 147 and the connecting portion 148 may be integrally formed.

Both the ignitor 149 and the probe-type flame detection device 151 extend axially, both disposed through the flame arrestor 132. And both are spaced from the flame holding means 146. Illustratively, both are disposed laterally of the flame holding bluff body 147. Alternatively, two through holes may be formed in the flame holding blunt body 147, and the two through holes may penetrate through the flame holding blunt body 147. Wherein the probe-type flame detection device 151 extends to the outlet section 144. When a flame is established, a flame ion current which flows through the flame stabilizing bluff body 147 and is grounded to form a loop can be generated at the flame detection device, and then a flame signal indication is given.

The ignition device 149 may be configured as an ignition electrode capable of discharging the flame holding bluff body 147. When the ignition device 149 is disposed through the flame holding bluff body 147, the arc of the discharge may appear as a fan. In this way, the mixture can be ignited more easily, especially also successfully when the flow rate of the mixture is extremely fast.

The ignition device 100 of the utility model fully utilizes the internal space of the device, has compact integral structure, can adopt different types of flame monitoring devices under the condition of not increasing the size of the device, and improves the adaptability to corollary equipment and use environment.

Second preferred embodiment

Fig. 4 shows a second preferred embodiment of the utility model. The second preferred embodiment of the present invention is a modification of the first preferred embodiment. The ignition device of the second preferred embodiment has a similar structure and/or construction to the ignition device of the first preferred embodiment except for the temperature detecting means 150. Accordingly, elements having substantially the same function as in the first preferred embodiment will be numbered identically herein and will not be described and/or illustrated in detail for the sake of brevity.

In the present embodiment, the combustion portion 140 is further provided with a temperature detection device 150 provided along the axial direction. Which extends through firestop device 132 and to expansion section 141. Therefore, when the detected temperature value is abnormal, the flow of the fuel gas and the flow of the combustion-supporting gas can be timely adjusted.

Among them, the temperature detection device 150, the probe-type flame detection device 151, and the ignition device 149 may be disposed in a circumferential direction.

Third preferred embodiment

Fig. 5 shows a third preferred embodiment of the utility model. The third preferred embodiment of the present invention is a modification of the first preferred embodiment. The ignition device of the third preferred embodiment has a similar structure and/or construction to the ignition device of the first preferred embodiment except for the acquisition passage 123, the image type flame detection means 124, and the purge passage 125. Accordingly, elements having substantially the same function as in the first preferred embodiment will be numbered identically herein and will not be described and/or illustrated in detail for the sake of brevity.

In the present embodiment, the flame detection device employs an image-type flame detection device 124 provided at the tip 111 of the ignition apparatus 100. Also, an axially extending pick-up channel 123 is provided within the ignition device 100. Preferably, pick-up channel 123 extends along a central axis of ignition device 100. Wherein one end of the collecting channel 123 is connected to the image type flame detection device 124, and the other end extends through the extension portion 130 and the flame holder 146 in turn to communicate with the combustion portion 140, so that the image type flame detection device 124 can obtain a view for observing the combustion state through the collecting channel 123.

Specifically, the collection channel 123 extends through the premix chamber 114, the mixing connection 119, the swirling device 122, the flow distributing device 131, the flame arrestor 132, and the flame holder 146. Furthermore, the collecting channel 123 also passes through the connecting part 148 of the flame holding device 146 and the central axis of the flame holding blunt body 147.

Preferably, the ignition device is provided with a purge channel 125, and the purge channel 125 is communicated with the collection channel 123 to introduce purge gas into the collection channel 123, wherein the purge gas is preferably inert gas such as nitrogen, or the purge gas may be air. Preferably, the purge passage 125 extends from the collection passage 123 within the ignition device out of the ignition device. According to the scheme, the combustion condition can be monitored by using the image type flame detection device 124, the visual field cannot be blocked, and for example, the blowing gas can prevent fly ash or carbon deposition and the like from entering the collection channel 123.

In this embodiment, the fuel gas nozzle 116 and the venturi passage 120 cannot be located along the central axis. For this purpose, the premixing chamber 114 has at least two fuel gas lances 116, the mixing connection 119 being provided with a corresponding number of venturi channels 120. For example, three fuel gas lances 116 and three venturi passages 120, four fuel gas lances 116 and four venturi passages 120, five fuel gas lances 116 and five venturi passages 120, six fuel gas lances 116 and six venturi passages 120, seven fuel gas lances 116 and seven venturi passages 120, eight fuel gas lances 116 and eight venturi passages 120, and so on. This can further improve the momentum exchange efficiency, improve the mixing uniformity, and improve the flow rate.

Fourth preferred embodiment

Fig. 6 shows a fourth preferred embodiment of the utility model. The fourth preferred embodiment of the present invention is a modification of the third preferred embodiment. The ignition device of the fourth preferred embodiment has a similar structure and/or construction to the ignition device of the third preferred embodiment except for the temperature detecting means 150. Accordingly, elements having substantially the same function as in the third preferred embodiment will be numbered identically herein and will not be described and/or illustrated in detail for the sake of brevity.

The flows and steps described in all the preferred embodiments described above are only examples. Unless an adverse effect occurs, various processing operations may be performed in a different order from the order of the above-described flow. The above-mentioned steps of the flow can be added, combined or deleted according to the actual requirement.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the utility model to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an ignition equipment, its characterized in that, is including the portion of premixing that is used for the mixture of fuel gas and combustion-supporting gas, it is connected with fuel gas channel and combustion-supporting gas channel to premix the portion, it has the chamber of premixing in the portion to premix, combustion-supporting gas channel with premix the chamber intercommunication, it is provided with to premix the chamber:

2. The ignition device of claim 1,

At least two swirling devices are arranged in the premixing cavity, are arranged at intervals along the axial direction of the premixing part and are far away from the tail end of the ignition device relative to the Venturi channel, and the flow cross-sectional areas of the at least two swirling devices decrease progressively along the direction far away from the tail end.

3. The ignition device of claim 1, further comprising an extension for conveying the mixture, the extension being in communication with the premixing section, the extension having a uniform distribution means disposed therein, the uniform distribution means being located at a junction of the extension and the premixing section, the uniform distribution means having first through-going honeycomb holes uniformly distributed therein.

4. The ignition apparatus of claim 3, wherein the end of the extension remote from the premixing section is provided with a flame arrestor, the flame arrestor being provided with uniformly distributed second through-going honeycomb holes.

5. The ignition device of claim 4,

6. The ignition apparatus according to claim 4, further comprising a combustion portion for combustion and flame injection of the mixture, the combustion portion communicating with the extension portion, the combustion portion having an injection port, the combustion portion having provided therein:

ignition, ignition follows axial extension and with flame holding device separates, ignition runs through back-fire relief device, just ignition is located flame holding blunt body's side or run through flame holding blunt body.

7. The ignition apparatus according to claim 6, characterized in that the combustion portion includes:

an outlet section connected to the convergent section, the outlet section having inner diameters that are equal in an axial direction and smaller than the inner diameter of the equal-diameter section, the end of the outlet section being configured as the jet port.

8. An ignition device as claimed in claim 7, wherein the combustion portion is further provided with a temperature sensing means disposed along the axial direction and extending through the flame arrestor means and to the expansion section.

9. The ignition device of claim 7, wherein one of said venturi passages and one of said fuel gas injectors are disposed along a central axis of said premixing portion.

10. The ignition device of claim 7, wherein at least two of the venturi passages and at least two of the fuel gas injectors are circumferentially disposed and are centrosymmetrically disposed relative to a central axis of the premixing portion.

11. The ignition device according to claim 9 or 10, wherein the combustion portion is further provided with a probe-type flame detection device, the probe-type flame detection device is axially arranged and penetrates through the flame arresting device, the probe-type flame detection device is positioned at a side of the flame stabilizing bluff body or penetrates through the flame stabilizing bluff body, and the probe-type flame detection device extends to the outlet section.

12. The ignition device of claim 10, wherein the end of the ignition device is provided with an image-based flame detection device, the ignition device is provided with a collection channel, one end of the collection channel is in butt joint with the image-based flame detection device, the other end of the collection channel extends along the central axis and penetrates through the extension portion and the flame stabilizing device to be communicated with the combustion portion, and the ignition device is further provided with a purging channel which is communicated with the collection channel so as to introduce purging gas into the collection channel.

13. The ignition device according to any one of claims 1 to 10, characterized in that the end of the fuel gas lance is provided with a spray head, the spray orifices of which are configured as petals or swirl vanes.

14. The ignition device of claim 13, wherein the nozzle orifice has an area less than a cross-sectional area of a throat of the venturi passage.