CN114321899A - Torch combustion system and combustion method thereof - Google Patents

Abstract

The invention provides a torch combustion system and a combustion method thereof, and the torch combustion system comprises a combustor and a fuel supply system, wherein the combustor comprises a main combustion chamber, a pre-combustion chamber, a re-combustion structure, a heating and heat return pipeline, a main fuel pipeline, a pre-fuel pipeline and a fuel distributor. 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

Torch combustion system and combustion method thereof

Technical Field

The invention relates to a torch combustion system and a combustion method thereof, 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.

ZL200710087037.2 provides a gas flame ware that stabilizes, adopts gaseous fuel, has structurally adopted the scheme of main combustion chamber and precombustion chamber, has played flame stabilization's effect to a certain extent, nevertheless can not effectively reburn after main burning flame extinguishes, and combustion efficiency is not high simultaneously, can cause carbon deposit and soot to discharge, influences burning and polluted environment.

ZL201320016728.4 provides a prevent handheld torch of stifling, and ZL201220614046.9 provides a torch with the combustion-supporting device of oxygen supply, has all increased the apparatus of oxygen supply in the torch, can increase extra device on the one hand, and oxygen and gaseous fuel supply cooperation are difficult to be controlled, and on the other hand these two structures all do not have the effect of stable flame, easily extinguish and can't effectively reburn, and combustion efficiency is not high simultaneously.

ZL200620055362.1 provides prevent wind rain-proof torch combustor, and ZL200620056314.4 provides the super steady state combustor for the torch, all adopts the burning of interior outer lane to prevent that flame from extinguishing, but the effect of outer lane does not also have stable flame in these two structures equally, easily extinguishes and can't effective after burning, and the not high existence carbon deposit of combustion efficiency simultaneously.

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 a torch combustion system and a torch combustion method, which have the advantages of simple structure, good flame stabilizing effect, difficulty in flameout and capability of effectively re-combusting.

The technical solution of the invention is as follows: a torch combustion system comprises a burner and a fuel supply system, wherein the fuel supply system comprises a fuel bottle and a gas-phase pressure stabilizing device, the burner comprises a main combustion chamber, a precombustion chamber, a re-combustion structure, a heating and heat return pipeline, a main fuel pipeline, a pre-fuel pipeline and a fuel distributor, the heating and heat return pipeline is connected with the fuel supply system, extends to the outer side of the fuel bottle after being wound above or below the main fuel pipeline for a plurality of circles, and is connected with the inlet end of the fuel distributor after being wound for a plurality of circles, the outlet end of the fuel distributor is divided into at least two paths, one path is connected with the main fuel pipeline, the other path is connected with the precombustion pipeline, the main fuel pipeline extends upwards to the inside of the main combustion chamber, the precombustion pipeline is connected with the bottom of the precombustion chamber, and the flame of the main combustion chamber ignites the mixed gas in the precombustion chamber through the re structure to form flame of the precombustion 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.

A flare combustion method comprising the steps of:

a supply of gaseous fuel;

burning in the main combustion chamber;

heating and backheating fuel;

the pre-combustion chamber is used for combustion, fuel sprayed into the pre-combustion chamber is premixed with air entering the pre-combustion chamber, main flame combusted in the main combustion chamber is ignited through a flame transfer passage on the re-combustion structure and a gap reserved on the periphery of the flame transfer passage, premixed fuel in the pre-combustion chamber is formed in the pre-combustion chamber, the flame in the pre-combustion chamber continuously heats the re-combustion structure for heat storage, and flameless combustion is carried out on the flame transfer passage and the periphery of the flame transfer passage;

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

(4) 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 gas flame stabilizer according to the present invention (a reburning structure is located in a 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 a flare combustion system including a burner and a fuel supply system.

The fuel supply system comprises a fuel bottle 1 and a gas phase pressure stabilizer 3, a bottle valve 2 is fixed at the mouth of the fuel bottle 1, the gas phase pressure stabilizer 3 is connected with the bottle valve 2, when the burner just works, the gas phase pressure stabilizer 3 and the bottle valve 2 are opened, high-pressure gas phase fuel steam (such as propane and the like) in the bottle is decompressed in the gas phase pressure stabilizer 3 through the bottle valve 2 and is maintained near a certain relatively stable pressure value, and then enters a heating and heat return pipe 10. Specific fuel supply system designs are known in the art.

The burner is shown in fig. 1 and 2 and comprises a main combustion chamber 8, a pre-combustion chamber 6, a re-combustion structure 7, a heating and back-heating pipeline 10, a main fuel pipeline 5, a pre-combustion pipeline 11 and a fuel distributor 4. The heating and heat-returning pipeline 10 is connected with the gas-phase pressure stabilizing device 3, extends upwards to the upper part or the lower part of the main fuel pipeline 5, winds a plurality of circles and then extends to the outer side of the fuel bottle 1, winds a plurality of circles and then is connected with the inlet end of the fuel distributor 4, the outlet end of the fuel distributor 4 is at least divided into two paths, one path is connected with the main fuel pipeline 5, and the other path is connected with the pre-fuel pipeline 11.

The main fuel pipeline 5 extends upwards to the inside of the main combustion chamber 8, a plurality of fuel spray holes are uniformly distributed on the main fuel pipeline 5 in the main combustion chamber 8, fuel is sprayed to the main combustion chamber 8, 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 pre-fuel pipeline 11 is connected with the bottom of the pre-combustion chamber 6, more than 1 or 2 jet holes can be arranged at the connection part, and fuel is sprayed from the bottom of the pre-combustion chamber. And an air inlet hole 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 hole and is preliminarily premixed with the injected fuel at the lower part of the precombustion chamber.

The re-combustion structure 7 is fixedly arranged at the lower part of the main combustion chamber or the middle upper part of the pre-combustion chamber, is positioned between the flame of the main combustion chamber and the flame of the pre-combustion chamber, and is fixed by a re-combustion structure fixing seat 9, and a certain gap is reserved between the re-combustion structure 7 and the wall surface of the main combustion chamber or the pre-combustion chamber. The re-combustion structure fixing seat 9 can be fixedly connected with the pre-combustion chamber or the main combustion chamber, and can also be fixedly connected with a heat return pipeline through a main fuel pipeline or heating.

Fig. 1 and 2 show an installation manner of the afterburning structure 7, the heating and regenerative pipeline 10 is located below the main fuel pipeline 5, the afterburning structure 7 is installed in the main combustion chamber 8 and located between the main fuel pipeline 5 (main flame) and the heating and regenerative pipeline 10 (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 mode of the afterburning structure 7 is that the heating and heat return pipeline 10 is located below the main fuel pipeline 5, the afterburning structure 7 is installed at the middle upper part of the precombustion chamber 6 and is located between the heating and heat return pipeline 10 (lower end part) and the precombustion flame, and a certain gap is formed between the periphery of the afterburning structure and the wall surface of the precombustion chamber. The afterburner structure 7 can be mounted in other ways as long as it is located between the main and prechamber flames.

The reburning structure 7 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 7 may be made of metal, ceramic, or other materials, but is not limited thereto, as long as it can perform the functions of heat storage and adhesion of a combustion catalyst, and the specific material, size, and other design may be realized by optimization design. 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 and heat return pipe 10 is connected with the gas phase pressure stabilizing device 3, extends upwards to the upper part or the lower part of the main fuel pipeline 5, winds a plurality of circles and then extends to the outer side of the fuel bottle 1, and winds a plurality of circles and then is connected with the inlet end of the fuel distributor 4. Further optimization, the part (heating part) of the heating and regenerative pipeline 10 wound above or below the main fuel pipeline 5 is heated, the inner wall of the pipe is coated with a cracking catalyst, and the outer wall of the pipe is coated with a combustion catalyst, so that the combustion efficiency and the combustion cleanliness can be further improved. 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 winding part (regenerative part) of the heating and regenerative tube 10 on the outer side of the fuel bottle 1 is designed according to the need, and may be U-shaped winding as shown in fig. 1, or may be spiral or other forms.

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 4 is divided into at least three paths, one path is connected with the main fuel pipeline 5, the other path is connected with the pre-fuel pipeline 11, the other path is connected with the pre-combustion chamber pipeline, the pre-combustion chamber pipeline extends into the pre-combustion chamber 6, a plurality of fuel spray holes are uniformly distributed on the pre-combustion chamber pipeline in the pre-combustion chamber, fuel is sprayed to the pre-combustion chamber 6, and the fuel distributor is arranged below the re-combustion structure.

Furthermore, the wind and rain resistant structure can be added at the outlet of the torch combustion system, so that the wind and rain resistant capability of the torch combustion system is improved.

The invention further provides a combustion method adopting the torch combustion system, which comprises the steps of gas fuel supply, fuel heating and regenerative heating, main combustion chamber combustion, precombustion chamber combustion, main combustion chamber extinguishing and re-combustion and the like.

The steps of gas fuel supply, fuel heating and recuperation, and main combustion chamber combustion are prior art and will be apparent to those skilled in the art. Further, a part (heating part) of the main fuel pipeline wound above or below the main fuel pipeline is heated and reheated, the inner wall of the pipe is coated with a cracking catalyst, the outer wall of the pipe is coated with a combustion catalyst, the fuel is heated and cracked in the fuel heating and reheating step, and the main flame is used for catalytic combustion in the main combustion chamber combustion step.

The pre-combustion chamber is used for combustion, fuel sprayed into the pre-combustion chamber is premixed with air entering the pre-combustion chamber, main flame combusted in the main combustion chamber is ignited through a flame transfer passage on the re-combustion structure and a gap reserved on the periphery of the flame transfer passage, premixed fuel in the pre-combustion chamber is formed in the pre-combustion chamber, the flame in the pre-combustion chamber continuously heats the re-combustion structure for heat storage, and flameless combustion is carried out on the flame transfer passage and the periphery of the flame transfer passage.

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.

Air injection is formed during combustion of the precombustion chamber and the main combustion chamber, and air entering from the precombustion chamber, the main combustion chamber and a gap between the main combustion chamber and the precombustion chamber under the injection action increases the air quantity participating in torch combustion, so that the combustion efficiency is improved, and the pollution emission is reduced.

The principle of the invention is as follows:

when the device starts to work, a cylinder valve and a gas-phase pressure stabilizing device are opened, high-pressure gas-phase fuel steam in a cylinder is decompressed by the gas-phase pressure stabilizing device and is maintained near a certain relatively stable pressure value, the steam enters a heating and regenerative pipeline, the heated fuel enters a fuel distributor to be divided into two or three paths after flowing through the precombustion chamber and the position of a fuel cylinder, one path of the heated fuel is sprayed into the precombustion chamber from the bottom and is mixed with air in the precombustion chamber, and the mixed gas is combusted (or partially combusted through catalytic combustion of a re-combustion structure) in the precombustion chamber; the other path is sprayed into the main combustion chamber through a main fuel pipeline for combustion; the flame of the main combustion area (flame of the main combustion chamber) is transferred to the pre-combustion chamber through the flame transfer passage on the re-combustion structure and the reserved space on the periphery of the re-combustion structure, stable pre-combustion flame is formed in the pre-combustion chamber, and then the flame continuously heats the re-combustion structure to play a heat storage role. When the outer flame (main flame) of the torch is extinguished, the afterburning structure can ignite the outer flame again by using the accumulated heat to perform flameless combustion so as to ensure the afterburning after flameout. Part of the heat generated by the combustion is transferred to the fuel bottle through the heat return pipe to maintain the energy required by the fuel in the fuel bottle for evaporation.

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

Claims (10)

1. A flare combustion system, characterized by: the burner comprises a main combustion chamber, a precombustion chamber, a re-combustion structure, a heating and heat return pipeline, a main fuel pipeline, a pre-fuel pipeline and a fuel distributor, wherein the heating and heat return pipeline is connected with the fuel supply system, extends to the upper part or the lower part of the main fuel pipeline after being wound for a plurality of circles and then extends to the outer side of the fuel bottle, and is connected with the inlet end of the fuel distributor after being wound for a plurality of circles;

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. A flare combustion system as defined in claim 1, wherein: the secondary combustion structure is arranged in the main combustion chamber and 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.

3. A flare combustion system as defined in claim 1, wherein: the re-burning structure is arranged at the middle upper part of the pre-burning chamber and is positioned above the flame of the pre-burning chamber, and a certain gap is reserved between the periphery of the re-burning structure and the wall surface of the pre-burning chamber.

4. A flare combustion system as defined in claim 1, 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. A flare combustion system according to claim 1, 2, 3 or 4, wherein: the inner wall of the heating and heat return pipeline is coated with a cracking catalyst, and the outer wall of the heating and heat return pipeline is coated with a combustion catalyst.

6. A flare combustion system according to claim 1, 2, 3 or 4, 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. A flare combustion system according to claim 1, 2, 3 or 4, wherein: the outlet end of the fuel distributor is connected with a precombustion chamber pipeline, the precombustion chamber pipeline extends into the precombustion chamber, a plurality of fuel spray holes are uniformly distributed on the precombustion chamber pipeline in the precombustion chamber, and the fuel spray holes spray fuel to the precombustion chamber and are arranged below the re-combustion structure.

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

a supply of gaseous fuel;

burning in the main combustion chamber;

heating and backheating fuel;

the pre-combustion chamber is used for combustion, fuel sprayed into the pre-combustion chamber is premixed with air entering the pre-combustion chamber, main flame combusted in the main combustion chamber is ignited through a flame transfer passage on the re-combustion structure and a gap reserved on the periphery of the flame transfer passage, premixed fuel in the pre-combustion chamber is formed in the pre-combustion chamber, the flame in the pre-combustion chamber continuously heats the re-combustion structure for heat storage, and flameless combustion is carried out on the flame transfer passage and the periphery of the flame transfer passage;

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.

9. A flare combustion method as defined in claim 8, wherein: in the combustion step of the pre-combustion chamber, combustion catalysts are attached to the surface of the re-combustion 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-combustion structure.

10. A flare combustion method as defined in claim 8, wherein: in the fuel heating and heat regeneration step, 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.

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