A premixing device for methanol combustion

Abstract

This invention discloses a premixing device for methanol combustion, comprising a liquid tank, a gas tank, a pre-detection component, and a premixing tube assembly connected to an inlet pipe. The outlet end of the premixing tube assembly extends into the combustion chamber. A first switching valve is connected between the inlet pipe and the liquid tank, and a second switching valve is connected between the inlet pipe and the gas tank. The pre-detection component includes a first outlet pipe and a third switching valve, and the premixing tube assembly includes a second outlet pipe and a fourth switching valve. An anti-leakage component is fitted onto the outside of each switching valve. This invention can use both liquid and gaseous methanol, and the pre-detection component performs concentration detection before premixing to check the concentration stability of the premixed methanol. Then, the methanol is thoroughly mixed with air in the premixing tube assembly to achieve safe ignition and combustion. Finally, the anti-leakage components on each switching valve can promptly react with any leaked methanol, reducing its impact on air quality.

Description

Technical Field

[0001] This utility model relates to the field of industrial burner technology, and in particular to a premixing device for methanol combustion. Background Technology

[0002] Methanol is an internationally recognized clean fuel. As an oxygen-containing compound, its combustion emissions are significantly lower than those of petroleum combustion. However, methanol still has characteristics including toxicity, flammability, explosiveness, and corrosiveness. When used as a fuel, it is still necessary to prevent methanol leakage, especially in the premixing stage before combustion. Leakage prevention measures at each stage are very important. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a premixing device for methanol combustion that can improve the premixing efficiency of methanol, monitor methanol leakage, and deal with leaked methanol in a timely manner.

[0004] To solve the above-mentioned technical problems, the present invention provides a premixing device for methanol combustion, comprising a liquid tank and a gas tank both connected to an inlet pipe, and a pre-inspection component and a premixing pipe assembly both connected to the outlet end of the inlet pipe. The outlet end of the premixing pipe assembly extends into the combustion chamber. A first switching valve is provided between the inlet pipe and the liquid tank, and a second switching valve is provided between the inlet pipe and the gas tank. The pre-inspection component includes a first outlet pipe connected to the inlet pipe, and a third switching valve is provided on the first outlet pipe. The premixing pipe assembly includes a second outlet pipe connected to the inlet pipe, and a fourth switching valve is provided on the second outlet pipe. An anti-leakage component is fitted on the outside of each switching valve.

[0005] The above structure includes a liquid tank and a gas tank, controlled by a first and a second switching valve, allowing the use of liquid and gaseous methanol as fuel inputs respectively. During operation, the third switching valve is first opened to detect the methanol concentration stability using a pre-detection component. Then, the third switching valve is closed, and the fourth switching valve is opened to discharge methanol into a premixing assembly for premixing before finally igniting it in the combustion chamber. Leak-proof components are installed at the locations of the switching valves to prevent methanol leakage, enabling timely neutralization and absorption, thus preventing both toxicity and deflagration.

[0006] To facilitate monitoring of pressure changes during liquid-gas conversion and simplify the installation structure, preferably, a liquid outlet pipe is connected to the liquid outlet end of the liquid tank, and an electric heating tube is sleeved on the outside of the liquid outlet pipe; a pressure gauge is inserted into one side of the liquid outlet pipe, and a front three-way valve is connected to the discharge end of the liquid outlet pipe. One side of the front three-way valve is connected to the first gas outlet pipe, and the other side of the front three-way valve is connected to the second gas outlet pipe.

[0007] To quickly detect the concentration and stability of methanol, preferably, the pre-detection component also includes an igniter fixed at the outlet end of the first outlet pipe, a protective cover is provided on the outside of the first outlet pipe, the outlet end of the first outlet pipe and the ignition end of the igniter are both located inside the protective cover, and a vent is provided on one side of the protective cover.

[0008] To facilitate the mixing of methanol and air, preferably, the premixed pipe assembly also includes a rear three-way valve connected to the outlet end of the second outlet pipe. One side of the rear three-way valve is connected to the air injection pipe, and the other side is connected to the premixed gas pipe. A fifth switching valve is connected to the premixed gas pipe, and a leak-proof component is also fitted on the outside of the fifth switching valve. The outlet end of the premixed gas pipe extends into the combustion chamber, and an atomizing nozzle is connected to the inlet end of the premixed gas pipe.

[0009] To improve the efficiency of methanol-air mixing, preferably, the air inlet end of the injection pipe is connected to a fan, and an air heat exchanger is also connected between the injection pipe and the fan.

[0010] In order to make full use of the heat of combustion and reduce energy consumption, preferably, a branch pipe is also connected to the air injection pipe at the position between the fan and the air heat exchanger. A sixth switch valve is connected to the branch pipe. The outlet end of the branch pipe extends into the combustion chamber. A hot air pipe is connected to one side of the combustion chamber. The outlet end of the hot air pipe is connected to the air heat exchanger.

[0011] To prevent methanol leakage and diffusion, and to facilitate the guidance of methanol into the reaction vessel, the leak-proof assembly preferably includes a baffle consisting of a left cover and a right cover screwed together and fixedly fitted outside each switch valve, and a reaction vessel disposed outside the baffle. The reaction vessel is provided with a cap, on which an vent hole is provided. The outer wall of the corresponding switch valve and the inner wall of the baffle together form a sealed cavity structure. An exhaust hole is provided on one side of the baffle. The inner side of the exhaust hole communicates with the cavity structure, and the outer side of the exhaust hole communicates with an exhaust pipe, which communicates with the reaction vessel.

[0012] To simplify the gas guiding structure inside the reaction flask, preferably, a first partition and a second partition are staggered inside the reaction flask. The two partitions divide the inner side of the reaction flask into a first cavity, a second cavity, and a third cavity that are interconnected. The first cavity is connected to the exhaust pipe, and a guide pipe is provided between the second cavity and the third cavity.

[0013] To ensure that the leaked methanol is fully absorbed and treated, preferably, the reaction flask is filled with sodium hydroxide solution, the first cavity is connected to the exhaust pipe at a position below the liquid surface, one side of the guide pipe is located in the second cavity and protrudes above the liquid surface, and the other side of the guide pipe is located in the third cavity and is below the liquid surface.

[0014] To facilitate monitoring of the leakage status, preferably, an observation window is provided on the side wall of the reaction vessel at the location corresponding to the connection between the first cavity and the exhaust pipe.

[0015] Beneficial effects: This invention can use both liquid and gaseous methanol, and is equipped with a pre-detection component to detect the concentration stability of the premixed methanol before premixing. Then, the methanol is fully mixed with air in the premixing tube assembly to meet the requirements for safe ignition and combustion. Finally, each switch valve is equipped with a leak-proof component to promptly react and treat any leaked methanol, reducing the impact on air quality. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the shield structure.

[0019] Figure 3 This is a schematic diagram of the installation structure of the shield.

[0020] Figure 4 This is a schematic diagram of the reaction flask.

[0021] Figure 5 This is a schematic diagram showing the usage status of the reaction flask.

[0022] The meanings of the labels in the attached diagram are as follows:

[0023] Liquid tank-1; air inlet pipe-10; electric heating element-11; liquid outlet pipe-12; pressure gauge-120; front three-way valve-13; hot air pipe-14;

[0024] Gas cylinder-2; First gas outlet pipe-31; Ignition device-32; Protective cover-33; Vent-331;

[0025] Second air outlet pipe - 42; Rear three-way valve - 43; Air injection pipe - 44; Premixed air pipe - 45; Fan - 46; Air heat exchanger - 47; Branch pipe - 48; Atomizing nozzle - 49.

[0026] First switch valve -51; Second switch valve -52; Third switch valve -53; Fourth switch valve -54; Fifth switch valve -55; Sixth switch valve -56;

[0027] Baffle-6; Reaction flask-60; First cavity-601; Second cavity-602; Third cavity-603; Exhaust port-61; Exhaust pipe-62; First partition-63; Second partition-64; Guide pipe-65; Gas outlet-66; Observation window-67; Combustion chamber-7. Detailed Implementation

[0028] Depend on Figures 1 to 5 As shown, this utility model includes a liquid tank 1 and a gas tank 2, both connected to the intake pipe 10, and a pre-inspection assembly and a premixing pipe assembly, both connected to the outlet end of the intake pipe 10. The outlet end of the premixing pipe assembly extends into the combustion chamber 7. A first switching valve 51 is provided between the intake pipe 10 and the liquid tank 1, and a second switching valve 52 is provided between the intake pipe 10 and the gas tank 2. The pre-inspection assembly includes a first outlet pipe 31 connected to the intake pipe 10, and a third switching valve 53 is provided on the first outlet pipe 31. The premixing pipe assembly includes a second outlet pipe 42 connected to the intake pipe 10, and a fourth switching valve 54 is provided on the second outlet pipe 42. An anti-leakage assembly is sleeved on the outside of each of the switching valves.

[0029] Specifically, a liquid outlet pipe 12 is connected to the liquid outlet end of the liquid tank 1, and an electric heating tube 11 is sleeved on the outside of the liquid outlet pipe 12; a pressure gauge 120 is inserted into one side of the liquid outlet pipe 12, and a front three-way valve 13 is connected to the discharge end of the liquid outlet pipe 12. One side of the front three-way valve 13 is connected to the first air outlet pipe 31, and the other side of the front three-way valve 13 is connected to the second air outlet pipe 42.

[0030] The pre-inspection component also includes an igniter 32 fixed at the outlet end of the first outlet pipe 31. A protective cover 33 is provided on the outside of the first outlet pipe 31. The outlet end of the first outlet pipe 31 and the ignition end of the igniter 32 are both located inside the protective cover 33. A vent 331 is provided on one side of the protective cover 33.

[0031] In addition, the premixed pipe assembly also includes a rear three-way valve 43 connected to the outlet end of the second outlet pipe 42. One side of the rear three-way valve 43 is connected to the injection pipe 44, and the other side is connected to the premixed pipe 45. A fifth switching valve 55 is connected to the premixed pipe 45, and a leak-proof component is also fitted on the outside of the fifth switching valve 55. The outlet end of the premixed pipe 45 extends into the combustion chamber 7, and the inlet end of the premixed pipe 45 is connected to an atomizing nozzle 49. The inlet end of the injection pipe 44 is connected to a fan 46, and an air heat exchanger 47 is also connected between the injection pipe 44 and the fan 46.

[0032] A branch pipe 48 is also connected to the air injection pipe 44 at the position between the fan 46 and the air heat exchanger 47. A sixth switch valve 56 is connected to the branch pipe 48. The outlet end of the branch pipe 48 extends into the combustion chamber 7. A hot air pipe 14 is connected to one side of the combustion chamber 7. The outlet end of the hot air pipe 14 is connected to the air heat exchanger 47.

[0033] The leak-proof assembly includes a baffle 6 screwed together by a left cover and a right cover and fixedly fitted outside each switch valve, and a reaction bottle 60 disposed outside the baffle 6. The reaction bottle 60 is provided with a cap, on which an vent hole 66 is provided. The outer side wall of the corresponding switch valve and the inner side wall of the baffle 6 form a sealed cavity structure. An exhaust hole 61 is provided on one side of the baffle 6. The inner side of the exhaust hole 61 communicates with the cavity structure, and the outer side of the exhaust hole 61 communicates with an exhaust pipe 62. The exhaust pipe 62 communicates with the reaction bottle 60.

[0034] A first partition 63 and a second partition 64 are staggered inside the reaction flask 60. The two partitions divide the inner side of the reaction flask 60 into a first cavity 601, a second cavity 602, and a third cavity 603 that are interconnected. The first cavity 601 is connected to an exhaust pipe 62. A guide pipe 65 is provided between the second cavity 602 and the third cavity 603. The reaction flask 60 is filled with sodium hydroxide solution. The connection point between the first cavity 601 and the exhaust pipe 62 is below the liquid surface. One side of the guide pipe 65 is located in the second cavity 602 and protrudes above the liquid surface. The other side of the guide pipe 65 is located in the third cavity 603 and is below the liquid surface.

[0035] An observation window 67 is provided on the side wall of the reaction flask 60 at the position corresponding to the connection between the first cavity 601 and the exhaust pipe 62.

[0036] The working principle of this utility model is as follows:

[0037] like Figure 1As shown, before use, only the sixth switch valve 56 is opened and the blower 46 is turned on. Air enters the combustion chamber 7 through the branch pipe 48 to first discharge the gas in the combustion chamber 7. The discharged gas enters the air heat exchanger 47 through the hot gas pipe 14. At this time, the air heat exchanger 47 only needs to open its own exhaust valve to assist in discharging the gas in the combustion chamber 7 and avoid the residual gas in the combustion chamber 7 from affecting the efficiency of methanol ignition. After discharging the air for a period of time, on the premise that there is no residual gas in the combustion chamber 7, the fifth switch valve 55 is opened and the sixth switch valve 56 is closed, and the blower 46 is temporarily turned off.

[0038] Example 1

[0039] like Figures 1 to 5 As shown, when using it, taking the use of liquid methanol as fuel as an example, close the second switch valve 52 and the fourth switch valve 54, first turn on the electric heating tube 11, and then turn on the first switch valve 51 and the third switch valve 53. The methanol in the liquid tank 1 flows into the liquid outlet pipe 12. After the liquid methanol is released from the liquid tank 1, it is first depressurized and then converted into a gaseous state. Since the electric heating tube 11 has preheated the liquid outlet pipe 12 beforehand, the gaseous methanol can maintain a constant temperature in the liquid outlet pipe 12 before reaching the boiling point.

[0040] Next, the gaseous methanol flows sequentially through the inlet pipe 10, the first three-way valve 13, and the third switch valve 53 into the first outlet pipe 31. At this time, the igniter 32 is turned on to ignite the gaseous methanol flowing out of the first outlet pipe 31. The color of the flame and the stability of the flame are observed to determine the concentration of the liquid methanol. If there is no problem, the third switch valve 53 is closed first. After the flame at the opening of the first outlet pipe 31 is extinguished, the fourth switch valve 54 is opened. At the same time, the air heat exchanger 47 and the fan 46 are turned on. While introducing gaseous methanol into the second outlet pipe 42, the fan 46 also injects air into the air injection pipe 44. The air heat exchanger 47 heats the injected air. The heated air is rich in water vapor so that it can be fully mixed with the gaseous methanol to form a stable combustion gas. It also preheats the mixed combustion gas.

[0041] Gaseous methanol is mixed with injected heated air in the premixed gas pipe 45, and then sprayed into the combustion chamber 7 through the atomizing nozzle 49, where it is ignited and burned by the ignition component (not shown) of the combustion chamber 7.

[0042] During this process, the air heated in the combustion chamber 7 can be discharged into the circulation pipeline in the air heat exchanger 47 through the hot air pipe 14. At this time, the heating system of the air heat exchanger 47 can be turned off, and only the circulation pump needs to be turned on to meet the heating treatment of the air injected by the fan 46, which saves energy to a certain extent.

[0043] Example 2

[0044] like Figure 1 As shown, unlike Example 1, when using gaseous methanol as fuel, the first switch valve 51 and the fourth switch valve 54 are closed first. At this time, the electric heating tube 11 is not turned on. The second switch valve 52 and the third switch valve 53 are turned on directly. The gaseous methanol in the gas tank 2 directly enters the inlet pipe 10 and flows into the first outlet pipe 31 through the first three-way valve 13 and the third switch valve 53 for gas pre-testing. After the test is completed, the subsequent operation is the same as the relevant steps in Example 1, and will not be repeated here.

[0045] Throughout the entire operation, since the switch valve is located at the connection point of the pipeline transmission, gaps can easily appear at the connection point, leading to leakage. Therefore, an air leakage prevention component is installed at each switch valve location. Specifically, taking the installation structure of the first switch valve 51 position as an example, such as... Figures 1 to 3 As shown, the left cover (not shown) and the right cover (not shown) are screwed together to form a baffle 6 fixedly fitted on the outside of the switch valve. That is, the left and right covers are fitted in position against the outer wall of the switch valve, and the outer wall of the switch valve at the corresponding position and the inner wall of the baffle 6 form a sealed cavity structure. A sealing ring (not shown) is also provided inside the baffle 6 at the position corresponding to the valve handle of the switch valve. An exhaust hole 61 is provided on one side of the baffle 6. The inner side of the exhaust hole 61 is connected to the cavity structure, and the outer side of the exhaust hole 61 is connected to the exhaust pipe 62. The exhaust pipe 62 is connected to the reaction bottle 60 fixed on the outside of the baffle 6. The structure of the baffle 6 at other switch valve positions is the same and will not be illustrated again.

[0046] Meanwhile, the reaction flask 60 is equipped with a cap, on which a vent 66 is provided. Inside the reaction flask 60, a first partition 63 and a second partition 64 are staggered, dividing the inner side of the reaction flask 60 into three interconnected cavities: a first cavity 601, a second cavity 602, and a third cavity 603. The first cavity 601 is connected to an exhaust pipe 62. A guide pipe 65 is provided between the second cavity 602 and the third cavity 603. Sodium hydroxide solution is poured into the reaction flask 60, ensuring that the connection point between the first cavity 601 and the exhaust pipe 62 is below the liquid surface. One side of the guide pipe 65 is located in the second cavity 602 and protrudes above the liquid surface, while the other side of the guide pipe 65 is located in the third cavity 603 and is below the liquid surface (e.g., ...). Figure 5(As shown); In this way, even if a leak occurs at the position of the switch valve, the leaked methanol enters the first cavity 601 through the exhaust pipe 62 and reacts with the sodium hydroxide solution to remove the gas toxicity; when the sodium hydroxide content in the first cavity 601 is consumed by the reaction, the methanol gas emerges into the space between the first cavity 601 and the second cavity 602, and flows out through the guide pipe 65 under pressure. The outlet position is in the third cavity 603. The lower part between the second cavity 602 and the third cavity 603 is connected, which is equivalent to twice the capacity of the first cavity 601, and can neutralize and react with more methanol gas to produce sodium methoxide and water. The treated gas emerges from the liquid surface and is discharged through the vent 66. The discharged gas is not toxic.

[0047] Since the reaction between methanol and sodium hydroxide is a reversible equilibrium reaction, the forward reaction is limited at room temperature. In addition to the two gas-liquid contact reactions in the reaction bottle, the most important thing is to detect leaks in time. Therefore, an observation window 67 is provided on the reaction bottle 60 at the position corresponding to the connection between the first cavity 601 and the exhaust pipe 62. In order to facilitate observation with sufficient light, two observation windows 67 should be set symmetrically. If bubbles are found to enter the reaction bottle during a reasonable inspection cycle, the combustion should be stopped immediately.

[0048] Next, loosen the screws connecting the left and right covers, remove the baffle 6, open the bottle cap, pour the sodium hydroxide solution in the reaction bottle 60 into the water tank to dilute it, and finally discharge it into the wastewater tank; when using it again, simply refill it with sodium hydroxide solution.

[0049] It should be noted that when the combustion chamber 7 in this embodiment is set as a boiler or other existing form of use, the heat generated by the combustion chamber 7, apart from the cyclic use of the heat output of the air heat exchanger 47 involved in this embodiment, is connected to other use equipment in the same way as the corresponding prior art, and will not be described again here.

Claims

1. A premixing device for methanol combustion, characterized in that: The system includes a liquid tank (1) and a gas tank (2) both connected to the intake pipe (10), as well as a pre-inspection assembly and a premixing pipe assembly both connected to the outlet end of the intake pipe (10). The outlet end of the premixing pipe assembly extends into the combustion chamber (7). A first switching valve (51) is provided between the intake pipe (10) and the liquid tank (1), and a second switching valve (52) is provided between the intake pipe (10) and the gas tank (2). The pre-inspection assembly includes a first outlet pipe (31) connected to the intake pipe (10), and a third switching valve (53) is provided on the first outlet pipe (31). The premixing pipe assembly includes a second outlet pipe (42) connected to the intake pipe (10), and a fourth switching valve (54) is provided on the second outlet pipe (42). A leak-proof assembly is fitted on the outside of each of the switching valves.

2. The premixing device for methanol combustion as described in claim 1, characterized in that: A liquid outlet pipe (12) is connected to the liquid outlet end of the liquid tank (1) and is connected to the air inlet pipe (10). The first switch valve (51) is connected to the liquid outlet pipe (12). An electric heating tube (11) is sleeved on the outside of the liquid outlet pipe (12). A pressure gauge (120) is inserted on one side of the liquid outlet pipe (12). A front three-way valve (13) is connected to the discharge end of the liquid outlet pipe (12). One side of the front three-way valve (13) is connected to the first air outlet pipe (31), and the other side of the front three-way valve (13) is connected to the second air outlet pipe (42).

3. The premixing device for methanol combustion as described in claim 1, characterized in that: The pre-inspection component also includes an igniter (32) fixed at the outlet end of the first outlet pipe (31). A protective cover (33) is provided on the outside of the first outlet pipe (31). The outlet end of the first outlet pipe (31) and the ignition end of the igniter (32) are both located inside the protective cover (33). A vent hole (331) is provided on one side of the protective cover (33).

4. A premixing device for methanol combustion as described in claim 1, characterized in that: The premixed pipe assembly also includes a rear three-way valve (43) connected to the outlet end of the second outlet pipe (42). One side of the rear three-way valve (43) is connected to the air injection pipe (44), and the other side is connected to the premixed gas pipe (45). A fifth switch valve (55) is connected to the premixed gas pipe (45), and a leak-proof component is also fitted on the outside of the fifth switch valve (55). The outlet end of the premixed gas pipe (45) extends into the combustion chamber (7), and the inlet end of the premixed gas pipe (45) is connected to an atomizing nozzle (49).

5. A premixing device for methanol combustion as described in claim 4, characterized in that: The air inlet of the air injection pipe (44) is connected to a fan (46), and an air heat exchanger (47) is also connected between the air injection pipe (44) and the fan (46).

6. A premixing device for methanol combustion as described in claim 5, characterized in that: A branch pipe (48) is also connected to the air injection pipe (44) at the position between the blower (46) and the air heat exchanger (47). A sixth switch valve (56) is connected to the branch pipe (48). The outlet end of the branch pipe (48) extends into the combustion chamber (7). A hot air pipe (14) is connected to one side of the combustion chamber (7). The outlet end of the hot air pipe (14) is connected to the air heat exchanger (47).

7. A premixing device for methanol combustion as described in claim 4, characterized in that: The leak-proof assembly includes a baffle (6) screwed together by a left cover and a right cover and fixedly fitted on the outside of each switch valve, and a reaction bottle (60) disposed outside the baffle (6). The reaction bottle (60) is provided with a cap, on which an vent hole (66) is provided. The outer wall of the switch valve at the corresponding position and the inner wall of the baffle (6) together form a sealed cavity structure. An exhaust hole (61) is provided on one side of the baffle (6). The inner side of the exhaust hole (61) is connected to the cavity structure, and the outer side of the exhaust hole (61) is connected to an exhaust pipe (62). The exhaust pipe (62) is connected to the reaction bottle (60).

8. A premixing device for methanol combustion as described in claim 7, characterized in that: A first partition (63) and a second partition (64) are staggered inside the reaction flask (60). The two partitions divide the inner side of the reaction flask (60) into a first cavity (601), a second cavity (602), and a third cavity (603) that are interconnected. The first cavity (601) is connected to the exhaust pipe (62), and a guide pipe (65) is provided between the second cavity (602) and the third cavity (603).

9. A premixing device for methanol combustion as described in claim 8, characterized in that: The reaction flask (60) is filled with sodium hydroxide solution. The first cavity (601) is connected to the exhaust pipe (62) below the liquid surface. One side of the guide pipe (65) is located in the second cavity (602) and protrudes above the liquid surface. The other side of the guide pipe (65) is located in the third cavity (603) and is below the liquid surface.

10. A premixing device for methanol combustion as described in claim 8, characterized in that: An observation window (67) is provided on the side wall of the reaction vessel (60) at the position corresponding to the connection between the first cavity (601) and the exhaust pipe (62).

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