A methanol fuel self-gasifying burner for industrial kilns

Abstract

The present invention discloses a methanol fuel self-gasification burner for industrial kilns, including a burner body, the burner body including a fuel inlet for inputting gasified methanol and a burner nozzle for spraying flames, and also including a gasification component, the burner nozzle including a combustion chamber sleeve for forming a combustion chamber, the gasification component including a heat transferer tightly sleeved on the periphery of the combustion chamber sleeve, a gasification pipe wound inside the heat transferer, and a PTC electric heating element tightly sleeved on the periphery of the gasification pipe, the gasification pipe outlet and the fuel inlet are connected through a methanol gas delivery pipe. The overall structure of the present invention is simple and ingenious, and no external special fuel gasification device is required, nor is an electric heating gasifier temperature control device required, and the gasification component can control the temperature within the most suitable range for complete gasification of methanol fuel by adjustment.

Description

Technical Field

[0001] The invention relates to the field of burners, and in particular to a methanol fuel self-gasification burner for industrial kilns. Background Art

[0002] The existing methanol fuel burner and fuel gasification device are separated, and the installation of the combustion system is relatively complicated. The installation space on some industrial kilns is limited, which makes it impossible to use the combustion system. Since the burner and the fuel gasification device are separated, the gasification device is a certain distance away from the burner. The high-temperature methanol gas after gasification needs to be transported to the burner by a metal pipe. When the burner power is small, that is, when the fuel flow rate is relatively small, the high-temperature methanol gas will gradually cool down in the fuel gas delivery pipeline, and part of the fuel will condense from the liquid phase to the liquid phase, which will cause burner ignition failure or unstable combustion, and may also cause carbon deposition failure in the burner. The methanol fuel gasification device in which the gasifier uses a temperature controller to control the temperature of the electric heating gasifier is not suitable for many types of small industrial kilns and is difficult to install and use. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The present invention provides a methanol fuel self-gasification burner for industrial kilns, which at least solves the problems that the existing methanol burner is separated from the gasification device and is complicated to install, and the high-temperature methanol gas will gradually cool down and condense in the fuel gas delivery pipeline, resulting in ignition failure and unstable combustion; and the existing gasification device uses a temperature controller to control the temperature of the electric heating gasifier, and the methanol fuel gasification device is not suitable for a variety of small industrial kilns and is difficult to install and use.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A methanol fuel self-gasification burner for an industrial kiln comprises a burner body, the burner body comprises a fuel inlet for inputting gasified methanol and a burner nozzle for ejecting flames, and also comprises a gasification component, the burner nozzle comprises a combustion chamber sleeve for forming a combustion chamber, the gasification component comprises a heat transferer tightly mounted on the periphery of the combustion chamber sleeve, a gasification pipe wound around the inside of the heat transferer, and a PTC electric heating element tightly mounted on the periphery of the gasification pipe, the gasification pipe outlet is connected to the fuel inlet via a methanol gas delivery pipe.

[0008] It is further provided that the burner nozzle further comprises an inner nozzle and a burner head, and the burner body further comprises an ejector, a premixing booster pipe, a secondary air inlet pipe, a backfire outer pipe, a primary air regulating ring and a secondary air regulating ring;

[0009] The end of the fuel inlet is connected to a nozzle of methanol gas;

[0010] The ejector is sealed and connected to the fuel inlet, and is provided with a primary air ejector chamber connected to the nozzle of the methanol gas, the primary air ejector chamber is connected to the outside through the primary air inlet hole, and the primary air ejector chamber gradually shrinks and extends in the gas outflow direction to form the ejector throat;

[0011] The premixing boosting pipe is sealed and connected to the ejector, and is in communication with the throat of the ejector, and its gas flow path is larger than the throat of the ejector;

[0012] The inner burner is connected to the outlet of the premixing and supercharging pipe and is provided with an outlet with a diameter smaller than that of the premixing and supercharging pipe;

[0013] The secondary air introduction pipe is sealed and connected to the periphery of the premixing and supercharging pipe, and forms a secondary air introduction chamber with the premixing and supercharging pipe, and the secondary air introduction chamber is connected to the outside through the secondary air introduction hole;

[0014] The outer tube of the regenerative combustion chamber is sealed and connected to the secondary air introduction tube, and forms a regenerative combustion chamber with the inner burner, and the regenerative combustion chamber is connected to the secondary air introduction chamber;

[0015] The burner head is sealed and connected to the outer tube of the backfire chamber, and a combustion chamber is formed at the air outlet of the inner burner, the combustion chamber is connected to the backfire chamber and is provided with a gradually contracting flame ejection port;

[0016] The primary air adjustment ring is threadedly connected to the outer periphery of the ejector and is used to cover the primary air introduction hole to adjust the opening of the primary air introduction hole;

[0017] The secondary air regulating ring is threadedly connected to the outer periphery of the secondary air introduction pipe and is used to cover the secondary air introduction hole to adjust the opening of the secondary air introduction hole.

[0018] With such arrangement, the burner avoids the occurrence of flame separation, flameout and flameout faults, achieves the best air-fuel ratio, improves combustion efficiency, makes the combustion products cleaner, and does not produce coking and carbon deposition.

[0019] It is further arranged that the gasification tube is a spiral coil gasification tube.

[0020] Such an arrangement improves the uniformity and efficiency of heating the gasification tube and enhances the gasification effect.

[0021] It is further provided that the heat transfer device is an aluminum heat transfer device.

[0022] With this arrangement, the aluminum heat transfer device has good thermal conductivity and low thermal inertia, thus avoiding local high temperatures.

[0023] It is further provided that the burner flame head and inner nozzle are made of corundum ceramic, and the fuel inlet, ejector, premixing boost pipe, secondary air inlet pipe, backfire chamber outer pipe, primary air regulating ring and secondary air regulating ring are made of stainless steel.

[0024] This arrangement allows for high temperature resistance, good thermal shock resistance and long service life.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the methanol fuel self-gasification burner for industrial kilns provided by the present invention has the following beneficial effects:

[0027] (1) Before starting the burner body, first energize the PTC terminal of the PTC electric heating element. The PTC electric heating element preheats the aluminum heat transfer element. When the temperature of the aluminum heat transfer element of the heater reaches the upper limit of the specified methanol fuel safe gasification temperature, the PTC electric heating element will automatically maintain the temperature of the aluminum heat transfer element (generally around 180°C); (The PTC electric heating element is a self-controlling ceramic heating element with a positive temperature coefficient. When the temperature of the heating element rises and exceeds the Curie point, the resistance increases, thereby limiting the increase in current.) This burner is connected to the methanol liquid fuel pump. When the aluminum heat transfer element is preheated successfully, the kiln control system starts the fuel pump, and the methanol liquid fuel pressurized by the methanol liquid fuel pump is discharged from the burner fuel inlet. The liquid fuel flows through the spiral gasification tube and is heated, then changes into gaseous state. The gaseous methanol is delivered to the ejector nozzle through the methanol gas delivery tube. The medium-pressure gaseous methanol is ejected from the nozzle at a very high speed. Negative pressure is generated around the high-speed methanol gas flow, and the combustion-supporting air is sucked into the premixed air ejector through the primary air inlet hole. The premixed gas flow after the primary air and the methanol gas flow are mixed here enters the premixed booster chamber. The velocity of the premixed gas flow decreases and the pressure increases in the premixed booster chamber. The pressurized premixed gas is ejected from the inner burner. At this time, ignition is performed (manually or automatically, depending on the original control method of the kiln), and the burner starts to burn. After the burner is ignited, the flame enters the combustion chamber from the backburning flame stabilizing chamber, and then enters the heated kiln. When the flame passes through the combustion chamber, a small amount of radiant heat energy of the flame is transferred to the aluminum heat transferer through the combustion chamber sleeve, and the aluminum heat transferer then transfers its heat energy to the spiral coil gasification tube to gasify the methanol fuel flowing through the spiral coil gasification tube, thereby realizing the self-gasification function of the methanol fuel; at this time, the PTC electric heating element basically consumes no electrical energy; the overlapping length of the aluminum heat transferer and the combustion chamber sleeve can also be changed to adjust the radiant heat obtained by the aluminum heat transferer so that it is within the power adjustment range of the burner and does not overheat, thereby eliminating the need for the use of traditional temperature controllers, simplifying the structure, reducing costs, reducing the occupied space, and making it more applicable.

[0028] (2) When the methanol fuel self-gasification burner for the industrial kiln is used, the methanol gas nozzle ejects the fuel gas flow at an extremely high speed. The high-speed fuel gas flow generates negative pressure in the primary air injection chamber, and the air outside the primary air inlet hole is injected into it. The fuel gas and the combustion-supporting air are strongly mixed at the throat of the injector. The mixed combustible gas enters the premixing pressurization chamber, where the path is enlarged, the flow rate of the combustible gas is greatly reduced, and the gas pressure is increased. Then the combustible gas flows from the inner burner into the junction of the reburning chamber and the combustion chamber, and after being ignited manually or automatically, a premixed combustion flame is formed in the combustion chamber and then ejected from the flame outlet of the burner at a high speed. When the flame is ejected at a high speed, a negative pressure is generated in the reburning chamber, and part of the smoke generated by the combustion is rolled inward here. At the same time, the peripheral air is sucked into the reburning chamber from the secondary air inlet hole and participates in the combustion as the secondary combustion-supporting air. This is equivalent to automatically maintaining an open flame in the reburning chamber during combustion, which can completely avoid the occurrence of flame separation, flameout and flameout failures. As long as the fuel supply is not interrupted, the burner will not flame out.

[0029] (3) According to the kiln's requirements for the burner's flame combustion intensity, the primary air adjustment ring can be rotated to adjust the opening of the primary air inlet hole, change the amount of induced air intake, and thus change the premixing ratio of the primary air; the higher the premixing ratio of the primary air, the higher the flame combustion intensity and the higher the flame temperature. The flame temperature can be adjusted between 1000°C and 1450°C, and its combustion effect is greatly improved compared to traditional gas kiln burners; at the same time, the secondary air volume can be adjusted by rotating the secondary air adjustment ring to adjust the opening of the secondary air inlet hole, change the secondary air intake volume, so that it reaches the optimal air-fuel ratio, improves combustion efficiency, makes the combustion products cleaner, and does not produce coking and carbon deposition;

[0030] (4) The premixing pressure chamber pressure of the methanol fuel self-gasification burner for the industrial kiln is relatively high, and the flow rate of the mixed gas flowing out of the inner burner is greater than the propagation speed of the flame, so no flashback failure will occur;

[0031] (5) The overall structure of the methanol fuel self-gasification burner for industrial kilns is simple and ingenious. It does not require an external special fuel gasification device, nor does it require an electric heating gasifier temperature control device. Its gasification component can automatically control the temperature within the most suitable range for complete gasification of methanol fuel. The size of the air inlet and the air distribution coefficient can be adjusted. The combustion is fully and stably without flame separation, flameout and flameout failures, and will not produce coking and carbon deposition. It is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1 As shown, Figure 1 It is a structural schematic diagram of the present invention.

[0035] The present invention provides a methanol fuel self-gasification burner for an industrial kiln, comprising a burner body 1, the burner body 1 comprising a fuel inlet 11 for inputting gasified methanol and a burner nozzle for spraying flames, the end of the fuel inlet 11 is connected to a nozzle 110, and also comprising a gasification component 2, the burner nozzle comprising a combustion chamber sleeve 10 for forming a combustion chamber, the gasification component 2 comprising a heat transferer 21 tightly sleeved on the outer periphery of the combustion chamber sleeve 10, a gasification pipe 22 wound around the inside of the heat transferer 21, and a P tightly sleeved on the outer periphery of the gasification pipe 22. TC electric heating element 23, PTC electric heating element 23 is energized through PTC terminal 24, PTC electric heating element 23 is a self-controlling ceramic heating element with a positive temperature coefficient, when the temperature of the heating element rises, when it exceeds the Curie point temperature, the resistance increases, thereby limiting the increase of current, at this time the temperature hardly rises any more, the outlet of gasification pipe 22 is connected to the fuel inlet 11 through methanol gas delivery pipe 25, gasified methanol is input into the burner body 1, wherein the fuel inlet 11 can be a pipe fitting integrated with the methanol gas delivery pipe 25.

[0036] The burner nozzle also includes an inner nozzle 12 and a burner head 13, and the burner body also includes an ejector 14, a premixing booster pipe 15, a secondary air introduction pipe 16, a backfire outer pipe 17, a primary air adjustment ring 18 and a secondary air adjustment ring 19;

[0037] The ejector 14 is sealed and connected to the fuel inlet 11, and is provided with a primary air ejection chamber 141 connected to the nozzle 110 of the methanol gas. The primary air ejection chamber 141 is connected to the outside through a primary air introduction hole 142. The primary air ejection chamber 141 gradually contracts and extends in the gas outflow direction to form an ejector throat 143.

[0038] The premixing boost pipe 15 is sealed and connected to the ejector 14, and the pipe cavity forms a premixing boost chamber 150, which is connected to the ejector throat 143, and its gas flow path is larger than the ejector throat 143;

[0039] The inner burner 12 is connected to the outlet of the premixing and boosting pipe 15 and is provided with an outlet 120 whose diameter is smaller than that of the premixing and boosting pipe 15;

[0040] The secondary air introduction pipe 16 is sealed and connected to the periphery of the premixing and supercharging pipe 15, and forms a secondary air introduction chamber 160 with the premixing and supercharging pipe 15. The secondary air introduction chamber 160 is communicated with the outside through the secondary air introduction hole 161;

[0041] The backfire chamber outer tube 17 is sealedly connected to the secondary air introduction tube 16 and forms a backfire chamber 170 with the inner burner 12. The backfire chamber 170 is communicated with the secondary air introduction chamber 160.

[0042] The burner head 13 is sealed and connected to the outer tube 17 of the backfire chamber, and a combustion chamber 130 is formed at the gas outlet 120 of the inner burner 12. The combustion chamber 130 is connected to the backfire chamber 170 and is provided with a gradually contracting flame outlet 131. The outer tube 10 of the combustion chamber is sealed and sleeved on the periphery of the burner head to form a combustion chamber 100 connected to the flame outlet; of course, the burner head 13 can also be integrally formed with the outer tube 10 of the combustion chamber;

[0043] The primary air adjustment ring 18 is threadedly connected to the outer periphery of the ejector 14, and is used to cover the primary air introduction hole 142 to adjust the opening of the primary air introduction hole 142;

[0044] The secondary air adjustment ring 19 is threadedly connected to the outer periphery of the secondary air introduction pipe 16 and is used to cover the secondary air introduction hole 161 to adjust the opening of the secondary air introduction hole 161 .

[0045] The gasification tube 22 is preferably a spiral gasification tube, which is heated more fully and evenly.

[0046] The heat transfer device 21 is an aluminum heat transfer device 21, and the heat transfer is efficient and fast.

[0047] The burner head 13 and the inner nozzle 12 are made of corundum ceramics, and the fuel inlet 11, the ejector 14, the premixing booster pipe 15, the secondary air inlet pipe 16, the backfire chamber outer pipe 17, the primary air regulating ring 18 and the secondary air regulating ring 19 are made of stainless steel.

[0048] The working process of the methanol fuel self-gasification burner for industrial kilns of the present invention is as follows: before starting the burner body 1, first energize the PTC terminal 24 of the PTC electric heating element 23, and the PTC electric heating element 23 preheats the aluminum heat transfer 21. When the temperature of the aluminum heat transfer 21 of the heater reaches the upper limit of the specified methanol fuel safe gasification temperature, the PTC electric heating element 23 will automatically maintain the temperature of the aluminum heat transfer 21 (generally around 180°C); this burner is connected to the methanol liquid fuel pump. After the aluminum heat transfer 21 is preheated successfully, the kiln control system starts the fuel pump, and the methanol liquid fuel pressurized by the methanol liquid fuel pump enters the spiral coil gasification pipe 22 from the burner fuel inlet 26, and the liquid fuel flows through the spiral coil gasification pipe 22. After the tube 22 is heated, the liquid fuel changes into a gaseous state, and the gaseous methanol is delivered to the nozzle 110 through the methanol gas delivery pipe 25. The medium-pressure gaseous methanol is ejected from the nozzle 110 at an extremely high speed, and a negative pressure is generated around the high-speed methanol gas flow, and the combustion-supporting air is sucked into the premixed air ejector 14 through the primary air inlet hole 142. The premixed gas flow after the primary air and the methanol gas flow are mixed here enters the premixed booster chamber 150. The flow rate of the premixed gas flow decreases in the premixed booster chamber 150, and the pressure increases. The pressurized premixed gas is ejected from the inner burner 12. At this time, ignition is performed (manually or automatically, depending on the original control method of the kiln), and the burner starts to burn; after the burner is ignited, the flame enters the combustion chamber 130 and the combustion chamber 100 from the backburning flame stabilizing chamber, and then enters the heated kiln. When the flame passes through the combustion chamber 100, a small amount of radiant heat energy of the flame is transferred to the aluminum heat transferer 21 through the combustion chamber sleeve 10, and the aluminum heat transferer 21 then transfers its heat energy to the spiral coil gasification tube 22, gasifying the methanol fuel flowing through the spiral coil gasification tube 22, realizing the self-gasification function of the methanol fuel; at this time, the PTC electric heating element 23 basically consumes no electric energy. By changing the overlapping length of the aluminum heat transferer 21 and the combustion chamber sleeve 10, the radiant heat obtained by the aluminum heat transferer 21 can be adjusted so that it is within the power adjustment range of the burner and does not exceed the rated temperature.

[0049] The principle of the present invention to avoid flame separation, flameout and flameout failures is as follows: when the burner body 1 is working, the methanol gas nozzle sprays out the fuel gas flow at an extremely high speed, and the high-speed fuel gas flow generates negative pressure in the primary air injection chamber 141, and the air outside the primary air inlet hole 142 is injected into it, and the fuel gas and the combustion-supporting air are strongly mixed at the injector throat 143; the mixed combustible gas enters the premixing booster chamber 150, where the path is enlarged, the flow rate of the combustible gas is greatly reduced, and the gas pressure is increased, and then the combustible gas flows from the inner burner 12 into the backfire chamber 170 and the combustion chamber The joint part of 130 is ignited manually or automatically to form a premixed combustion flame in the combustion chamber and then ejected at high speed from the flame ejection port of the burner; when the flame is ejected at high speed, negative pressure is generated in the reburner chamber 170, and part of the smoke generated by the combustion is rolled inwardly, and at the same time, the peripheral air is sucked into the reburner chamber 170 from the secondary air introduction hole 161, and participates in the combustion as secondary combustion air, which is equivalent to automatically maintaining an open flame in the reburner chamber 170 during the combustion period, which can completely avoid the occurrence of flame separation, flameout and flameout failures. As long as the fuel supply is not interrupted, the burner will not be extinguished;

[0050] The principle of avoiding coking and carbon deposition in the present invention is as follows: before operation, according to the requirements of the kiln for the combustion intensity of the burner flame, the primary air regulating ring 18 can be rotated to adjust the opening of the primary air inlet hole 142, change the induced air intake volume, and thus change the premixing ratio of the primary air; the higher the premixing ratio of the primary air, the higher the flame combustion intensity, and the higher the flame temperature. The flame temperature can be adjusted between 1000°C and 1450°C, and its combustion effect is greatly improved compared with the traditional gas kiln burner; at the same time, the secondary air volume is adjusted by rotating the secondary air regulating ring 19 to adjust the opening of the secondary air inlet hole 161, change the secondary air intake volume, so that it reaches the best air-fuel ratio, improves the combustion efficiency, makes the combustion products cleaner, and does not produce coking and carbon deposition.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A methanol fuel self-gasification burner for an industrial kiln, comprising a burner body, wherein the burner body comprises a fuel inlet for inputting gasified methanol and a burner nozzle for outputting flame, characterized in that: It also includes a gasification assembly, the burner nozzle includes a combustion chamber sleeve for forming a combustion chamber, the gasification assembly includes a heat transferer tightly sleeved on the periphery of the combustion chamber sleeve, a gasification pipe wound inside the heat transferer, and a PTC electric heating element tightly sleeved on the periphery of the gasification pipe, and the gasification pipe outlet is connected to the fuel inlet through a methanol gas delivery pipe; The burner nozzle also includes an inner nozzle and a burner head, and the burner body also includes an ejector, a premixing and pressurizing pipe, a secondary air inlet pipe, a backfire outer pipe, a primary air regulating ring and a secondary air regulating ring; The end of the fuel inlet is connected to a nozzle of methanol gas; The ejector is sealed and connected to the fuel inlet, and is provided with a primary air ejector chamber connected to the nozzle of the methanol gas, the primary air ejector chamber is connected to the outside through the primary air inlet hole, and the primary air ejector chamber gradually shrinks and extends in the gas outflow direction to form the ejector throat; The premixing boosting pipe is sealed and connected to the ejector, and is in communication with the throat of the ejector, and its gas flow path is larger than the throat of the ejector; The inner burner is connected to the outlet of the premixing and supercharging pipe and is provided with an outlet with a diameter smaller than that of the premixing and supercharging pipe; The secondary air introduction pipe is sealed and connected to the periphery of the premixing and supercharging pipe, and forms a secondary air introduction chamber with the premixing and supercharging pipe, and the secondary air introduction chamber is connected to the outside through the secondary air introduction hole; The outer tube of the regenerative combustion chamber is sealed and connected to the secondary air introduction tube, and forms a regenerative combustion chamber with the inner burner, and the regenerative combustion chamber is connected to the secondary air introduction chamber; The burner head is sealed and connected to the outer tube of the backfire chamber, and a combustion chamber is formed at the air outlet of the inner burner. The combustion chamber is connected to the backfire chamber and is provided with a gradually shrinking flame outlet. The combustion chamber sleeve is tightly sleeved on the outer periphery of the burner head. The primary air adjustment ring is threadedly connected to the outer periphery of the ejector and is used to cover the primary air introduction hole to adjust the opening of the primary air introduction hole; The secondary air adjustment ring is threadedly connected to the periphery of the secondary air introduction pipe and is used to cover the secondary air introduction hole to adjust the opening of the secondary air introduction hole; The gasification tube is a spiral coil gasification tube.

2. The methanol fuel self-gasification burner for industrial kilns according to claim 1 is characterized in that: The heat transfer device is an aluminum heat transfer device.

3. The methanol fuel self-gasification burner for industrial kilns according to claim 1 is characterized in that: The burner head and inner nozzle are made of corundum ceramics, and the fuel inlet, ejector, premixing boost pipe, secondary air inlet pipe, backfire chamber outer pipe, primary air adjustment ring and secondary air adjustment ring are made of stainless steel.

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