CN114321902A - Extract type torch combustion system and combustion method - Google Patents

Abstract

The invention provides an extract type torch combustion system and an extract type torch combustion method. The invention adopts the reburning structure with dual functions of catalytic combustion and heat storage-assisted reburning, on one hand, the reburning structure accumulates heat and performs flameless combustion on the passing mixed gas, thereby improving the reliability of the reburning, on the other hand, the mixed gas is subjected to catalytic combustion, thereby improving the combustion efficiency and cleanliness, reducing the emission of pollutants such as soot and the like, and partially eliminating the problem of carbon deposition.

Description

Extract type torch combustion system and combustion method

Technical Field

The invention relates to an extract type torch combustion system and an extract type torch combustion method, and belongs to the technical field of handheld torches.

Background

In various large-scale sports meetings and celebration activities, a handheld torch is often required to be used for transferring the fire seeds, and the process of transferring the fire seeds is carried out outdoors, so that the external environment has great influence on the combustion of the torch. At present, the domestic torch generally adopts gaseous fuel (such as propane, etc.), propane liquid gasifies in the gas cylinder, and gaseous phase propane steam provides the torch combustor, and the gas cylinder pressure can take place great change in the gas supply process, and the gas feed is unstable to cause the torch and can not stably burn, in addition weather is like effects such as wind and rain, temperature, very easily causes the torch to flame out, can't reburn. Particularly at low temperatures, the gaseous fuel may not be injected due to the pressure difference, making the torch difficult to start and not able to ignite smoothly.

ZL201520064425.9 provides a drawing liquid formula combustor, directly draw liquid fuel from the fuel bottle, convert liquid fuel into gaseous fuel through heating pipe and gasification chamber again, gaseous fuel is through fire hole blowout burning, though the gaseous fuel difficulty of igniting under the low temperature has been solved to a certain extent to the liquid formula of drawing, but its liquid gas conversion back, fuel directly burns, the poor very easy flame-out of steady flame effect, fuel combustion efficiency is not high simultaneously, can cause carbon deposit and soot to discharge, influence burning and polluted environment, and can't effectively after the torch is flamed out.

ZL200710087037.2 provides a gas flame ware that stabilizes, adopts gaseous fuel, and at the lower temperature, the fuel exists and probably interrupts the supply, has adopted the scheme of main combustion chamber and antechamber structurally, has played the effect of stable flame to a certain extent, but can not effectively reburn after main combustion flame extinguishes, and combustion efficiency is not high, can cause carbon deposit and soot to discharge, influences burning and polluted environment.

The metal windproof sheet is additionally arranged above the combustion port of the torch, when the torch is normally combusted, the windproof sheet is heated, and when flame is extinguished by wind, the windproof sheet is utilized to keep high temperature to ignite fuel again, so that the recombustion effect is achieved. For example, CN201020280148.2 provides a combustion device for a torch, in which a high melting point metal member (such as a tungsten wire) is disposed at a combustion port, the torch heats the tungsten wire after ignition, and when the flame is extinguished by wind, the fuel is re-ignited by the high temperature tungsten wire. The re-burning mode is not easy to maintain high temperature to re-ignite the fuel, and if the torch is in the working conditions of turning, leveling, inversion, falling and the like, the re-burning effect is not good. Still some torches install the purpose that the relight igniter reached the relight torch additional, but torch structure is complicated, and the ignition effect is not good. Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the extract type torch combustion system and the combustion method which can be used at low temperature, have simple structure and good flame stabilizing effect, are not easy to extinguish and can effectively reburn.

The technical solution of the invention is as follows: a liquid extracting type torch combustion system comprises a combustor and a fuel supply system, wherein the fuel supply system comprises a fuel bottle and a liquid extracting device, the combustor comprises a main combustion chamber, a precombustion chamber, a premixing chamber, a afterburning structure, a heating pipeline, a main fuel pipeline, a premixing chamber inlet fuel nozzle and a fuel distributor, the heating pipeline is connected with the liquid extracting device of the fuel supply system and extends to the upper part or the lower part of the main fuel pipeline to be wound for a plurality of circles and then is connected with the inlet end of the fuel distributor, the outlet end of the fuel distributor is divided into at least two paths, one path is connected with the main fuel pipeline, the main fuel pipeline extends upwards into the main combustion chamber, the other path is connected with the bottom of the premixing chamber through the premixing chamber inlet fuel nozzle, the upper end of the premixing chamber is connected with the precombustion chamber, a plurality of injection holes are uniformly distributed on the circumference of the lower part of the premixing chamber, fuel sprayed by the premixing chamber inlet fuel nozzle and air entering the injection holes are mixed in the precombustion chamber, the flame of the main combustion chamber is ignited by the secondary combustion structure and sprayed into the mixed gas in the pre-combustion chamber to form the flame of the pre-combustion chamber;

the secondary combustion structure is densely distributed with a plurality of flame transfer channels, the secondary combustion structure is fixedly arranged below the main fuel pipeline and is positioned between the flame of the main combustion chamber and the flame of the pre-combustion chamber, a combustion catalyst is attached to the surface of the secondary combustion structure and the inner wall of the flame transfer channel, the flame of the pre-combustion chamber heats the secondary combustion structure for heat storage, and flameless combustion is carried out on the secondary combustion structure.

An extract type torch combustion method comprises the following steps:

extracting liquid fuel;

burning in the main combustion chamber;

heating and gasifying the liquid fuel;

the air is injected in a first stage, the fuel which is heated and gasified is injected into the premixing chamber, and the injected fuel injects the air into the premixing chamber through the injection hole to form first stage injection;

the fuel is premixed in a first stage, and the fuel sprayed into the premixing chamber is mixed with air injected into the injection hole of the premixing chamber;

the air is injected into the precombustion chamber in a secondary injection mode, the fuel is injected into the precombustion chamber from the premixing chamber after the primary premixing, and the injected mixed gas injects the air into the precombustion chamber through an air inlet hole of the precombustion chamber to form secondary injection;

the fuel is subjected to secondary premixing/precombustion, the mixed gas sprayed into the precombustion chamber from the premixing chamber and the air injected into the precombustion chamber are subjected to secondary premixing, main flame combusted in the main combustion chamber is ignited to be mixed after secondary premixing in the precombustion chamber through a flame transfer passage on a afterburning structure and a clearance reserved at the periphery of the flame transfer passage, precombustion flame is formed in the precombustion chamber, the precombustion flame continuously heats the afterburning structure for heat storage, and flameless combustion is carried out on the flame transfer passage and the periphery of the flame transfer passage;

after the main combustion chamber is combusted, flame of the main combustion chamber injects air into the main combustion chamber through a gap between the main combustion chamber and the precombustion chamber and air holes on the main combustion chamber to form three-stage injection;

and the main flame extinguishes and reburns, when the main flame burnt in the main combustion chamber is extinguished, the reburning structure accumulates heat and carries out flameless combustion on the passing mixed gas, the main combustion chamber is reignited, and the main combustion chamber is burnt again.

Compared with the prior art, the invention has the beneficial effects that:

(1) the invention adopts the reburning structure with dual functions of catalytic combustion and heat storage-assisted reburning, on one hand, the reburning structure accumulates heat and performs flameless combustion on the passing mixed gas, thereby improving the reliability of the reburning, on the other hand, the mixed gas is subjected to catalytic combustion, thereby improving the combustion efficiency and cleanliness, reducing the emission of pollutants such as soot and the like, and partially eliminating the problem of carbon deposition;

(2) the installation position of the re-combustion structure of the invention ensures that the re-combustion structure is easier to store heat and combust without flame, further ensures the re-combustion reliability, and ensures that the torch still works reliably and re-combusts under the working conditions of overturning, leveling, inverting, falling and the like;

(3) according to the invention, the structural form of combining the premixing chamber, the precombustion chamber and the main combustion chamber forms a two-stage mixing and three-stage injection tissue combustion mode, so that the torch can be stably and efficiently combusted, and the wind and rain resistance is enhanced;

(4) the invention adopts the heating pipeline with dual functions of catalytic combustion and catalytic cracking, thereby further improving the combustion efficiency and the combustion cleanliness;

(5) the invention directly extracts the liquid fuel, solves the problem of difficult starting of the torch at low temperature, arranges the evaporation phase change process of the liquid fuel at the fuel heating pipeline (the winding part of the heating pipeline) in the main flame area, and compensates the heat absorbed by the fuel evaporation by the flame heat, thereby avoiding a regenerative system required by the gaseous fuel and simplifying the structure of the burner;

(6) according to the invention, the air inlet hole group is processed on the main combustion chamber, so that the exhaust effect under the wind condition is improved, and the flameout rate is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention (the post-combustion structure is located in the main combustion chamber);

FIG. 2 is a schematic view of a burner of the present invention (with a post-combustion configuration in the main combustion chamber);

FIG. 3 is a schematic view of a fuel bottle according to the present invention;

FIG. 4 is an enlarged view of FIG. 3I;

FIG. 5 is a schematic cross-sectional view of a post-combustion structure of the present invention (end faces are circumferentially densely covered with channels, the channel cross-section is circular);

FIG. 6 is a schematic cross-sectional view of a post-combustion structure of the present invention (end faces are circumferentially densely covered with channels, the channel cross-section is square);

FIG. 7 is a cross-sectional view (in the form of a grid) of a post-combustion structure according to the present invention.

Detailed Description

The present invention will be described in detail with reference to the following examples and accompanying drawings.

The present invention, as shown in FIG. 1, provides an extract flare combustion system including a burner and a fuel supply system.

The fuel supply system is shown in fig. 3 and 4, and includes a fuel bottle 3 and a chemical solution supply device including a filter 1, a liquid extraction tube 2, a bottle valve 4, and an on-off valve 5. The liquid extracting pipe 2 is inserted into the fuel bottle 3, the lower end of the liquid extracting pipe 2 is connected with the filter body 1, the upper end of the liquid extracting pipe 2 is connected to the cylinder valve 4, the cylinder valve 4 is connected with the switch valve 5, when the combustor just works, the switch valve 5 is opened, and the liquid fuel extracted from the fuel bottle 1 by the liquid extracting pipe 2 enters the heating pipe 13 through the switch valve 5. The fuel supply system can be referred to in the prior art, such as ZL201520064425.9 liquid extraction method, and related liquid extraction method.

The burner is shown in fig. 1 and 2 and comprises a main combustion chamber 11, a pre-combustion chamber 9, a premixing chamber 8, a re-combustion structure 10, a heating pipeline 13, a main fuel pipeline 7, a premixing chamber inlet fuel nozzle 15 and a fuel distributor 6. After being connected with the switch valve 5, the heating pipeline 13 extends upwards to the upper part or the lower part of the main fuel pipeline 7 and is wound for a plurality of circles and then is connected with the inlet end of the fuel distributor 6, the outlet end of the fuel distributor 6 is divided into at least two paths, one path is connected with the main fuel pipeline 7, and the other path is connected with the bottom of the premixing chamber 8 through a premixing chamber inlet fuel nozzle 15.

The main fuel pipeline 7 extends upwards to the inside of the main combustion chamber 11, a plurality of fuel spray holes are uniformly distributed on the main fuel pipeline in the main combustion chamber 11, fuel is sprayed to the main combustion chamber 11, and combustion in the main combustion chamber is carried out to form main flame. The side wall surface of the main combustion chamber is provided with a plurality of air holes, so that the discharge speed of the flue gas flowing back into the torch under the windy condition is increased, and the flame-out of the torch is avoided. Meanwhile, under the normal working condition, the air entering from the hole groups under the injection action of the main flame increases the air quantity participating in torch combustion, and is beneficial to improving the combustion efficiency and reducing the pollution emission.

The inlet fuel nozzle 15 of the premixing chamber is connected with the bottom of the premixing chamber 8, 1 (center) or more than 2 (circumferentially and uniformly distributed) spray holes can be arranged at the connection part, and fuel is sprayed from the bottom of the premixing chamber 8.

The premixing chamber 8 plays a role of primary premixing, and the flame stabilizing performance of the precombustion chamber can be further improved. As shown in fig. 1 and 2, a plurality of injection holes 81 are uniformly distributed in the circumferential direction at the lower part of the premixing chamber 8, the fuel heated in the heating pipeline is injected into the premixing chamber 8 from the premixing chamber inlet fuel nozzle 15, and is mixed with the air entering from the injection holes 81 to form a first-stage combustible premixed gas, and then is injected into the precombustion chamber 9 from the premixing chamber outlet gas mixing nozzle at the upper end of the premixing chamber at a relatively high speed, and is further mixed with the air entering the precombustion chamber 9, so that the first-stage premixing of the precombustion chamber is increased into two-stage premixing.

According to the invention, through the arrangement and size of the injection holes and the size design of the premixing chamber (the specific design can obtain an optimal scheme through simulation optimization), under the action of the fuel injected into the premixing chamber, the air entering the premixing chamber through the injection holes is subjected to injection action, so that the fuel can be fully mixed in the premixing chamber, and the subsequent combustion is utilized.

The premixing chamber can be in a cylindrical structure with the same diameter or variable diameter, and is divided into a lower injection area and an upper mixing area as shown in figures 1 and 2, wherein the diameter of the lower injection area is preferably smaller than that of the upper mixing area.

The gas mixing nozzle at the outlet of the premixing chamber can be provided with 1 (center) or more than 2 (circumferentially and uniformly distributed) spray holes, the combustible gas mixture sprayed out of the premixing chamber has high speed, the flame has good rigidity after being ignited, the flame is not easy to blow out, and the wind resistance is good; meanwhile, after the high-speed combustible mixed gas enters the precombustion chamber, an injection effect is formed in the precombustion chamber, the increase of the air flow entering the precombustion chamber is facilitated, and the mixing of the high-speed combustible mixed gas and fuel is enhanced. Meanwhile, the pre-combustion flame after pre-mixing has high energy density and better heating effect on a re-combustion structure.

And an air inlet is formed on the side wall surface at the bottom or the lower part of the precombustion chamber, and air enters the precombustion chamber through the air inlet and is subjected to secondary mixing with the primary mixed fuel sprayed by the premixing chamber at the lower part of the precombustion chamber.

The reburning structure 10 is fixedly arranged at the lower part of the main combustion chamber or the middle upper part of the precombustion chamber, is positioned between the flame of the main combustion chamber and the flame of the precombustion chamber, and is fixed by a reburning structure fixing seat 12, and a certain gap is reserved between the reburning structure 8 and the wall surface of the main combustion chamber or the precombustion chamber. The re-combustion structure fixing seat 12 can be fixedly connected with the pre-combustion chamber or the main combustion chamber, and can also be fixedly connected with the pre-combustion chamber or the main combustion chamber through a main fuel pipeline or a heating pipeline.

Fig. 1 and 2 show an installation mode of the afterburning structure 10, in which the heating pipeline 13 is located below the main fuel pipeline 7, and the afterburning structure 10 is installed in the main combustion chamber 11 and located between the main fuel pipeline 7 (main flame) and the heating pipeline 13 (upper end), and a certain gap is formed between the periphery of the afterburning structure and the wall surface of the main combustion chamber. Another installation manner of the re-combustion structure 10 is that the heating pipeline 13 is located below the main fuel pipeline 7, the re-combustion structure 10 is installed at the middle upper part of the pre-combustion chamber 9, and is located between the heating pipeline 13 (lower end part) and the pre-combustion flame, and a certain gap is formed between the periphery of the re-combustion structure and the wall surface of the pre-combustion chamber. The afterburner structure 8 can be mounted in other ways as long as it is located between the main and prechamber flames.

The reburning structure 8 is a three-dimensional structure with a certain thickness, and comprises a reburning structure main body and a plurality of flame transfer channels densely distributed on the reburning structure main body, wherein a combustion catalyst is attached to the surface of the reburning structure and the inner wall of the flame transfer channel, so that the reburning structure has dual functions of catalytic combustion and heat storage-assisted reburning (better reburning effect).

The afterburning structure accumulates heat and performs flameless combustion on the mixed gas passing through, so that the reliability of afterburning is further improved, and the flame transfer channel performs catalytic combustion on the mixed gas, so that the combustion efficiency and cleanliness are improved, the emission of pollutants such as carbon smoke and the like is reduced, and the problem of carbon deposition is partially eliminated; in addition, the torch can still be ensured to work reliably and reburning under the working conditions of overturning, leveling, inversion, falling and the like.

As shown in FIG. 5, a re-ignition structure is provided, which comprises a re-ignition structure main body 71 and a flame transmission channel 72 densely distributed on the re-ignition structure main body. The cross-section of the flame transfer passages 72 of the afterburner structure can be circular (as shown in FIG. 5), square (as shown in FIG. 6), or other shapes. As shown in FIG. 7, the flame transmission channel of the afterburning structure can also be a honeycomb structure or a grid structure.

The post-combustion structure 8 may be made of metal or ceramic, but is not limited thereto, as long as it can function as a heat storage and a combustion catalyst, and the specific material and size can be optimized. The combustion catalyst is used for catalytic combustion of fuel, and its kind is determined according to the kind of fuel, and is well known in the art.

One end of the heating pipeline 13 is connected with the switch valve 5, and then extends upwards to the upper part or the lower part of the main fuel pipeline 7 and is connected with the inlet end of the fuel distributor 6 after being wound for a plurality of circles. Further optimize, the heating line 13 is at the winding position (heating part) of main fuel pipeline 7 top or below, and the cracking catalyst is coated to the inner wall, and the burning catalyst is coated to the outer wall, can further improve combustion efficiency and burning cleanliness factor. The fuel on the inner wall of the pipe at the winding part is decomposed into components such as hydrogen which is easier to burn under the action of the cracking catalyst, so that the improvement of the combustion efficiency and the combustion reliability are facilitated, the carbon smoke emission is reduced, the combustion catalyst on the outer wall of the pipe carries out catalytic combustion on the flame of the main combustion area, and the combustion efficiency and the cleanliness are improved.

The cracking catalyst is used for catalytically cracking fuel, and the combustion catalyst is used for catalytically combusting the fuel, and the type of the combustion catalyst is determined according to the type of the fuel and is a well-known technology in the field.

Furthermore, the outlet end of the fuel distributor 6 is divided into at least three paths, one path is connected with the main fuel pipeline 7, the other path is connected with the premixing chamber inlet fuel nozzle 15, the other path is connected with the precombustion chamber fuel pipeline 14, the precombustion chamber fuel pipeline extends into the precombustion chamber 9, a plurality of fuel spray holes are uniformly distributed on the precombustion chamber fuel pipeline in the precombustion chamber, fuel is sprayed to the precombustion chamber 9, and the fuel spray holes are arranged below the re-combustion structure.

Furthermore, the invention can add a rain-shielding structure at the outlet of the extract type torch combustion system, thereby improving the rain resistance of the torch combustion system.

The invention further provides a combustion method adopting the extract type torch combustion system, which comprises the steps of liquid fuel extraction, main combustion chamber combustion, liquid fuel heating and gasification, primary air injection, primary fuel premixing, secondary air injection, secondary fuel premixing/precombustion, tertiary air injection, extinguishing and reburning of the main combustion chamber and the like.

Liquid fuel is extracted, and liquid fuel in the fuel bottle is extracted through the liquid extracting device.

The main combustion chamber is used for combustion, and the step is prior art, and can be seen by those skilled in the art. Further, the part (heating part) of the heating pipeline wound above or below the main fuel pipeline is coated with a cracking catalyst on the inner wall of the pipe, and is coated with a combustion catalyst on the outer wall, and main flame catalytic combustion is performed in the main combustion chamber combustion step.

The liquid fuel is heated and gasified, the extracted liquid fuel is heated and gasified in the heating pipeline, and then the gasified fuel is divided into at least two paths through the outlet end of the fuel distributor, wherein one path is distributed to the premixing chamber, and the other path is distributed to the main combustion chamber. Further, the part (heating part) of the heating pipeline wound above or below the main fuel pipeline is coated with a cracking catalyst on the inner wall of the pipe and a combustion catalyst on the outer wall, and the fuel is heated and cracked in the step of heating and gasifying the liquid fuel.

And air is injected in a primary stage, the heated and gasified fuel is injected into the premixing chamber through a premixing chamber inlet fuel nozzle connected with the outlet end of the fuel distributor, and the injected fuel injects the air into the premixing chamber through the injection hole to form primary injection.

The fuel is premixed in the first stage, and the fuel sprayed into the premixing chamber is mixed with air injected into the injection hole of the premixing chamber in the premixing chamber.

And air is injected into the precombustion chamber in a secondary injection mode, the fuel is injected into the precombustion chamber from the premixing chamber after the primary premixing, and the injected mixed gas injects the air into the precombustion chamber through an air inlet hole of the precombustion chamber to form secondary injection.

And (2) performing secondary premixing/precombustion on fuel, wherein the mixed gas sprayed into the precombustion chamber from the premixing chamber and the air injected into the precombustion chamber are subjected to secondary premixing, main flame combusted in the main combustion chamber is ignited to be mixed after secondary premixing in the precombustion chamber through a flame transfer passage on the afterburning structure and a clearance reserved at the periphery of the flame transfer passage, precombustion flame is formed in the precombustion chamber, the precombustion flame continuously heats the afterburning structure for heat storage, and flameless combustion is performed at the flame transfer passage and the periphery of the flame transfer passage.

In the step, the surface of the re-combustion structure and the inner wall of the flame transfer channel are adhered with combustion catalysts for catalytic combustion of the fuel, and the re-combustion structure stores heat and simultaneously carries out flameless combustion.

And after the main combustion chamber is combusted, the flame of the main combustion chamber injects air into the main combustion chamber through a gap between the main combustion chamber and the precombustion chamber and an air hole on the main combustion chamber to form three-stage injection.

The main flame extinguishes and reburns, when the main flame burnt in the main combustion chamber is extinguished, the reburning structure accumulates heat and carries out flameless combustion on the passing mixed gas, the main combustion chamber is reignited, and the main combustion chamber is burnt again.

The surface of the re-burning structure and the inner wall of the flame transfer channel are attached with a combustion catalyst, the re-burning structure accumulates heat and simultaneously carries out flameless combustion, the main combustion chamber is re-ignited, and the re-burning reliability is further improved.

The principle of the invention is as follows:

when the device starts to work, a bottle valve and a switch valve are opened, a liquid extracting pipe extracts liquid fuel in a bottle, the liquid fuel enters a heating pipeline, the heated fuel enters a fuel distributor to be divided into two paths or three paths after flowing through a combustion area, one path of the heated fuel is sprayed into a premixing chamber to be mixed for the first time, then the mixed fuel is sprayed into a precombustion chamber to be mixed for the second time with air in the precombustion chamber (and the other path of the heated fuel is sprayed into the precombustion chamber through a precombustion chamber fuel pipeline), and mixed gas is combusted in the precombustion chamber (or part of the mixed gas is catalyzed and combusted through a re-combustion structure); one path is sprayed into the main combustion chamber through the main fuel pipeline for combustion, when a torch is ignited, the main combustion chamber is ignited, flame combusted in the main combustion chamber is ignited through a flame transfer passage on the reburning structure and a gap reserved at the periphery of the flame transfer passage, secondary mixed gas in the precombusting chamber is ignited to form stable precombusting flame, and then the flame continuously heats the reburning structure to play a heat storage role. When the outer flame (main flame) of the torch is extinguished, the afterburning structure can utilize the accumulated heat to carry out flameless combustion, and the outer flame can be ignited again to ensure the afterburning after the flameout.

The invention has not been described in detail and is in part known to those of skill in the art.

Claims (11)

1. An extract formula torch combustion system which characterized in that: the fuel supply system comprises a fuel bottle and a liquid extracting device, the burner comprises a main combustion chamber, a precombustion chamber, a premixing chamber, a re-combustion structure, a heating pipeline, a main fuel pipeline, a premixing chamber inlet fuel nozzle and a fuel distributor, the heating pipeline is connected with the liquid extracting device of the fuel supply system, extends to the upper part or the lower part of the main fuel pipeline and is wound for a plurality of circles and then is connected with the inlet end of the fuel distributor, the outlet end of the fuel distributor is divided into at least two paths, one path is connected with the main fuel pipeline, the main fuel pipeline extends upwards into the main combustion chamber, the other path is connected with the bottom of the premixing chamber through the premixing chamber inlet fuel nozzle, the upper end of the premixing chamber is connected with the precombustion chamber, a plurality of injection holes are uniformly distributed in the circumferential direction of the lower part, fuel sprayed by the premixing chamber inlet fuel nozzle and air entering the injection holes are mixed in the precombustion chamber, the flame of the main combustion chamber is ignited by the secondary combustion structure and sprayed into the mixed gas in the pre-combustion chamber to form the flame of the pre-combustion chamber;

the secondary combustion structure is densely distributed with a plurality of flame transfer channels, the secondary combustion structure is fixedly arranged below the main fuel pipeline and is positioned between the flame of the main combustion chamber and the flame of the pre-combustion chamber, a combustion catalyst is attached to the surface of the secondary combustion structure and the inner wall of the flame transfer channel, the flame of the pre-combustion chamber heats the secondary combustion structure for heat storage, and flameless combustion is carried out on the secondary combustion structure.

2. The extract flare combustion system of claim 1, wherein: the secondary combustion structure is arranged in the main combustion chamber and is positioned below the flame of the main combustion chamber, and a certain gap is formed between the periphery of the secondary combustion structure and the wall surface of the main combustion chamber; or the re-combustion structure is arranged at the middle upper part of the pre-combustion chamber and is positioned above the flame of the pre-combustion chamber, and a certain gap is formed between the periphery of the re-combustion structure and the wall surface of the pre-combustion chamber.

3. An extract flare combustion system as defined in claim 1 or 2, wherein: the premixing chamber is in a cylindrical structure with the same diameter or variable diameter and consists of an injection area and a mixing area.

4. An extract flare combustion system as defined in claim 1 or 2, wherein: the afterburning structure is made of metal or ceramic materials, and the cross section of the flame transfer channel is of a square, circular, honeycomb or grid structure.

5. An extract flare combustion system as defined in claim 1 or 2, wherein: the inner wall of the heating pipeline is coated with cracking catalyst, and the outer wall of the heating pipeline is coated with combustion catalyst.

6. An extract flare combustion system as defined in claim 1 or 2, wherein: the side wall surface of the main combustion chamber is provided with a plurality of air holes, and the bottom or the side wall surface of the precombustion chamber is provided with an air inlet hole.

7. An extract flare combustion system as defined in claim 1 or 2, wherein: the outlet end of the fuel distributor also comprises a path of fuel pipeline connected with the precombustion chamber, the precombustion chamber fuel pipeline extends into the precombustion chamber, is uniformly provided with a plurality of fuel jet holes and jets fuel to the precombustion chamber, and is arranged at the middle lower part of the precombustion chamber.

8. An extract flare combustion system as defined in claim 1 or 2, wherein: the liquid extracting device comprises a filtering body, a liquid extracting pipe, a bottle valve and a switch valve, wherein the liquid extracting pipe is inserted into the fuel bottle, the lower end of the liquid extracting pipe is connected with the filtering body, the upper end of the liquid extracting pipe is connected to the bottle valve, and the bottle valve is connected with the switch valve.

9. A method of using the extract flare combustion system of claim 1, comprising the steps of:

extracting liquid fuel;

burning in the main combustion chamber;

heating and gasifying the liquid fuel;

the air is injected in a first stage, the fuel which is heated and gasified is injected into the premixing chamber, and the injected fuel injects the air into the premixing chamber through the injection hole to form first stage injection;

the fuel is premixed in a first stage, and the fuel sprayed into the premixing chamber is mixed with air injected into the injection hole of the premixing chamber;

the air is injected into the precombustion chamber in a secondary injection mode, the fuel is injected into the precombustion chamber from the premixing chamber after the primary premixing, and the injected mixed gas injects the air into the precombustion chamber through an air inlet hole of the precombustion chamber to form secondary injection;

the fuel is subjected to secondary premixing/precombustion, the mixed gas sprayed into the precombustion chamber from the premixing chamber and the air injected into the precombustion chamber are subjected to secondary premixing, main flames combusted in the main combustion chamber are subjected to fire transfer through a flame transfer passage on the reburning structure and a clearance reserved at the periphery of the flame transfer passage, the secondary premixed fuel in the precombustion chamber is ignited, precombustion flames are formed in the precombustion chamber, the precombustion flames continuously heat the reburning structure for heat storage, and flameless combustion is carried out at the flame transfer passage and the periphery of the flame transfer passage;

after the main combustion chamber is combusted, flame of the main combustion chamber injects air into the main combustion chamber through a gap between the main combustion chamber and the precombustion chamber and air holes on the main combustion chamber to form three-stage injection;

and the main flame extinguishes and reburns, when the main flame burnt in the main combustion chamber is extinguished, the reburning structure accumulates heat and carries out flameless combustion on the passing mixed gas, the main combustion chamber is reignited, and the main combustion chamber is burnt again.

10. The extract-type flare combustion method as claimed in claim 9, wherein: in the fuel secondary premixing/pre-burning step, a burning catalyst is attached to the surface of the re-burning structure and the inner wall of the flame transfer passage, and the main flame is subjected to catalytic combustion when being ignited by the re-burning structure; in the step of heating and gasifying the liquid fuel, the fuel is heated and catalytically cracked; and the fuel is combusted in a catalytic mode in the combustion step of the main combustion chamber.

11. The extract-type flare combustion method as claimed in claim 9, wherein: in the fuel secondary premixing/precombustion step, the mixed gas sprayed into the precombustion chamber from the premixing chamber and the fuel sprayed into the precombustion chamber are subjected to secondary premixing with the air injected into the precombustion chamber.

Images