CN214307105U

CN214307105U - Combustion system

Info

Publication number: CN214307105U
Application number: CN202023342510.7U
Authority: CN
Inventors: 管清华; 王波涛; 刘伟; 姚正博
Original assignee: Qingdao Huashijie Environment Protection Technology Co ltd
Current assignee: Qingdao Huashijie Environment Protection Technology Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-09-28
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a combustion system, concretely relates to combustion system that can stably light off. The combustion system comprises a combustion device and a pilot fire system connected to the combustion device; the main fire system is connected with a compressed air input component. The combustion system is suitable for a micro-pressure furnace, a negative pressure furnace and a positive pressure furnace with large hearth pressure fluctuation through designing an independent main fire system, and ignition is not influenced by hearth pressure.

Description

Combustion system

Technical Field

The utility model relates to a combustion system, concretely relates to combustion system that can stably light off.

Background

The linear combustor is common equipment in the field of VOCs treatment, adopts a direct combustion mode to heat air or other low-calorific-value process gases, is generally used for a micro-pressure hearth or a negative-pressure hearth, and has stable hearth pressure; the main flame is ignited by a direct spark plug, or by a pilot flame ignited by a spark plug, and then by the pilot flame of the burner.

In the field of VOC treatment, when a linear combustor is adopted to heat waste gas so as to meet the requirement of catalytic treatment temperature, the situation that the fluctuation of the concentration of VOC to be treated on site is large often occurs, so that the pressure fluctuation of a working hearth of the combustor is large, and the ignition failure of the linear combustor is caused.

Therefore, the burner in the prior art is only suitable for the working condition of stable pressure of the hearth such as a micro-pressure furnace or a negative pressure furnace. The pilot fire system only supplies natural gas fuel, and the required combustion air is supplied by the air of the main burner, so that when the pressure fluctuation of the hearth is large, the supply of the pilot fire fuel and the supply of the combustion air are influenced by the pressure fluctuation of the hearth, and the ignition of the pilot fire is unstable.

In view of this, the present application is specifically made.

SUMMERY OF THE UTILITY MODEL

The utility model provides a combustion system through the independent female fire system of design, can be applicable to micro-pressure furnace, negative-pressure furnace, can be applicable to the big malleation stove of furnace pressure fluctuation again, and the ignition is not influenced by furnace pressure.

The utility model discloses specific technical scheme as follows:

a combustion system comprises a combustion device and a pilot fire system connected to the combustion device; the main fire system is connected with a compressed air input component.

The main fire system comprises an outer sleeve, an inner sleeve and an ignition electrode which are combined from outside to inside; a first cavity is formed between the outer sleeve and the inner sleeve, and a second cavity is formed between the inner sleeve and the ignition electrode; the ignition electrode head extends out of the inner sleeve and is exposed.

The main fire system also comprises a cover plate collecting pipe, one end of the cover plate collecting pipe is in threaded connection with the head of the ignition electrode, the other end of the cover plate collecting pipe is in threaded connection with the outer sleeve, a cavity III is formed between the cover plate collecting pipe and the ignition electrode, and the cavity III is communicated with the cavity II; the cover plate collecting pipe isolates the first cavity and the second cavity from each other through threaded connection with the outer sleeve.

The compressed air input part is arranged on the outer sleeve, and compressed air can enter the first cavity to circulate.

The compressed air input part comprises a compressed air flow-limiting nozzle which is arranged on the outer sleeve. The external compressed air after being depressurized can stably set the air pressure of the inlet, so that the flow of the air passing through the fixed compressed air flow-limiting nozzle is stable; the design that the external pressure regulating valve is combined to set the inlet pressure which is larger than the pressure fluctuation range of the hearth can be realized, and the flow can just meet the combustion of the main fire due to the design that the compressed air flow limiting nozzle limits.

And a fuel inlet is formed in the cover plate collecting pipe, and fuel enters the cavity III and then enters the cavity II for circulation.

And the end part of the inner sleeve on one side of the tail part of the ignition electrode is connected with a mixing nozzle for mixing compressed air and fuel. The mixing nozzle is cylindrical, a fuel spray hole is formed in the bottom surface of the mixing nozzle, and the interior of the mixing nozzle is communicated with the second cavity through the fuel spray hole so that fuel can enter the mixing nozzle; the opening of the mixing nozzle is communicated with the combustion device.

And a plurality of holes are formed in the circumferential surface of the mixing spray head, and the inside of the mixing spray head is communicated with the cavity I through the holes so as to allow compressed air to enter.

Thereby, compressed air and fuel can enter the mixing nozzle separately for mixing. The tail part of the ignition electrode just extends into the bottom of the mixing nozzle, and is ignited and combusted in the cylinder.

The compressed air input component also comprises a compressed air pipeline connected with the compressed air flow limiting nozzle and a pressure regulating valve connected to the other end of the compressed air pipeline.

In the working process, the ignition electrode of the integral main fire ignites the main fire stabilizing burner, and then the main fire of the linear burner is ignited by the main fire.

Compressed air (namely combustion air) is set to a certain pressure through a pressure regulating valve and is matched with the flow limiting function of a compressed air nozzle, so that the inlet pressure ratio is ensured to be higher and far higher than the pressure of a hearth, and meanwhile, the flow is not too high, and the requirement of stable combustion of the fuel of the main fire is just met; meanwhile, air is formed through a mixed nozzle structure, the air and fuel are fully mixed, a certain injection effect is achieved on the fuel, and the pilot fire fuel can be smoothly mixed and combusted with the air under the condition that adjustment is not needed.

The utility model discloses a combustion system is through the independent female fire system of design for combustion air can cooperate fuel ignition burning under controllable flow, can be applicable to minute-pressure furnace, negative-pressure furnace, can be applicable to the big malleation stove of furnace pressure fluctuation again, and it does not receive the furnace pressure influence to ignite.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention.

FIG. 1 is a schematic view of the combustion system of the present invention;

fig. 2 is a schematic structural diagram of the middle fire system of the present invention.

Description of reference numerals:

1. a pressure regulating valve; 2. a compressed air line; 3. a main fire system; 301. an ignition electrode; 302. a fuel inlet; 303. a compressed air flow restricting nozzle; 304. an outer sleeve; 305. a mixing nozzle; 306. an inner sleeve; 307. a cover plate manifold; 308. a spout; 309. a fuel injection hole; 4. a linear burner.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to specific examples, but those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.

Example 1

A combustion system, as shown in FIG. 1, comprises a linear combustor 4 and a pilot system 3 connected to the linear combustor 4; a compressed air input component is connected to the pilot fire system 3, and comprises an external compressed air pipeline 2 and a pressure regulating valve 1 connected to the other end of the compressed air pipeline 2. Compressed air is used as combustion air.

As shown in fig. 2, the pilot firing system 3 includes an outer sleeve 304, an inner sleeve 306, and a firing electrode 301 combined from outside to inside; a first cavity is formed between the outer sleeve 304 and the inner sleeve 306, and a second cavity is formed between the inner sleeve 306 and the ignition electrode 301; the ignition electrode 301 head extends out of the inner sleeve 306 and is exposed.

The main fire system 3 further comprises a cover plate collecting pipe 307, one end of the cover plate collecting pipe 307 is in threaded connection with the head of the ignition electrode 301, the other end of the cover plate collecting pipe 307 is in threaded connection with the outer sleeve 304, a cavity III is formed between the cover plate collecting pipe 307 and the ignition electrode 301, and the cavity III is communicated with the cavity II; the cover plate manifold 307 isolates the first and second cavities from each other by a threaded connection with the outer sleeve 304.

The compressed air input part is arranged on the outer sleeve 304, and compressed air can enter the cavity I to circulate.

The compressed air input part comprises a compressed air flow-limiting nozzle 303, the compressed air flow-limiting nozzle 303 is arranged on the outer sleeve 304, and compressed air can enter the cavity to circulate. The compressed air after being externally connected with the pressure reduction can stably set the air pressure of the inlet, so that the flow of the air after passing through the fixed compressed air flow limiting nozzle 303 is stable; the pressure regulating valve 1 combined with the outside can be set to the inlet pressure which is larger than the pressure fluctuation range of the hearth, and the flow can just meet the combustion of the main fire due to the design of the limitation of the compressed air flow limiting nozzle 303.

The cover plate collecting pipe 307 is provided with a fuel inlet 302, and fuel enters the cavity III and then enters the cavity II for circulation.

A mixing nozzle 305 is connected to the end of the inner sleeve 306 on the rear side of the ignition electrode 301 for mixing the compressed air and the fuel. The mixing nozzle 305 is cylindrical, a fuel spray hole 309 is formed in the bottom surface of the mixing nozzle, and the interior of the mixing nozzle is communicated with the cavity II through the fuel spray hole 309 so that fuel can enter the mixing nozzle; the opening of the mixing nozzle is communicated with a linear burner 4.

Thereby, compressed air and fuel can enter the mixing nozzle separately for mixing. The tail of the ignition electrode 301 extends into the bottom of the mixing nozzle 305 to ignite and burn in the cylinder.

During operation, fuel enters through the fuel inlets 302 and reaches the combustion zone via the fuel orifices 309. Compressed air enters from the compressed air current-limiting nozzle 303 through pressure reduction and pressure stabilization and current-limiting restriction, passes through the first cavity and is sprayed into a combustion area through the holes, fuel and air are mixed in the mixing nozzle 305, and ignition is carried out by the ignition electrode 301 to ignite flames; the flame is ejected through the nozzle holes 308, and the linear burner 4 is stabilized and ignited to ignite the main fire.

The compressed air is set to a certain pressure through the pressure regulating valve 1, and the flow limiting function of the compressed air flow limiting nozzle 303 is matched, so that the inlet pressure ratio is ensured to be higher and far higher than the pressure of a hearth, and meanwhile, the flow is not too high, and the requirement of stable combustion of the pilot-fire fuel is just met; meanwhile, the air is formed by the special structure of the mixing nozzle 305, the air and the fuel are fully mixed, a certain injection effect is achieved on the fuel, and the pilot fire fuel can be smoothly mixed and combusted with the air without adjustment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Moreover, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

Claims

1. A combustion system comprises a combustion device and a pilot fire system connected to the combustion device; the main fire system is connected with a compressed air input component;

the main fire system comprises an outer sleeve, an inner sleeve and an ignition electrode which are combined from outside to inside; a first cavity is formed between the outer sleeve and the inner sleeve, and a second cavity is formed between the inner sleeve and the ignition electrode; the head of the ignition electrode extends out of the inner sleeve and is exposed;

2. The combustion system of claim 1 wherein said compressed air input is provided on said outer sleeve.

3. The combustion system of claim 2 wherein said compressed air input includes a compressed air flow restricting nozzle disposed on said outer sleeve.

4. A combustion system according to any one of claims 1 to 3, wherein the cover plate manifold is provided with a fuel inlet.

5. The combustion system as claimed in claim 4, wherein a mixing nozzle is connected to the end of the inner sleeve on the tail side of the ignition electrode, the mixing nozzle is cylindrical, a fuel nozzle hole is formed in the bottom surface of the mixing nozzle, and the interior of the mixing nozzle is communicated with the second cavity through the fuel nozzle hole; the opening of the mixing nozzle is communicated with the combustion device.

6. The combustion system of claim 5, wherein the mixing tip has a plurality of holes formed in a circumferential surface thereof, and the mixing tip interior is communicated with the cavity through the plurality of holes.

7. The combustion system of claim 3 wherein said compressed air input further comprises a compressed air line connected to said compressed air restriction nozzle and a pressure regulating valve connected at the other end of said compressed air line.