A combustion device based on low-concentration gas

Abstract

The present invention relates to the field of gas combustion, and discloses a combustion device based on low-concentration gas, comprising an air pump, a burner and two mixing components, wherein the mixing component comprises a mixing tank, a piston is provided in the mixing tank, a detection element is provided on the upper end surface of the piston, a convex tube is coaxially provided at the bottom of the tank bottom, an inner step is provided on the hole wall of the convex tube, a rotating tube is provided in the inner step, a support is provided at the upper end of the rotating tube, a lower air hole is provided on the outer circumferential surface of the rotating tube, a spring 1 is provided between the inner step and the support, a bevel gear 1 is installed in the support, a gear shaft of the bevel gear 1 is rotatably connected to the rotating tube, an upper air hole is provided on the outer circumferential surface of the gear shaft, blades are installed on the support along the radial direction of the rotating tube, and a bevel gear 2 meshing with the bevel gear 1 is provided on the connecting shaft formed at the installation position, a coil spring is provided between the bevel gear 1 and the support, and initially, under the action of the coil spring, the blades are arranged in an inclined manner.

Description

Technical Field

[0001] The present invention relates to the field of burners, in particular to the field of gas combustion, and in particular to a combustion device based on low-concentration gas. Background Art

[0002] Coal mine gas is an unconventional natural gas stored in coal seams. During the coal mining process, coal mine gas needs to be treated, generally by combustion.

[0003] Based on the search for low-concentration gas combustion in coal mining, some existing technologies have been discovered, which are now introduced one by one:

[0004] The Chinese invention patent application with application publication number CN115076689A discloses a low-concentration gas combustion device, which forms a mixed gas by mixing low-concentration gas with liquefied petroleum gas. The mixed gas is easy to burn stably.

[0005] The Chinese invention patent application, application publication number CN103016202A, discloses a method for generating electricity using low-concentration coal mine gas. The method involves mixing the low-concentration gas with air to generate a mixed combustion gas, which is then fed into a burner for combustion.

[0006] The Chinese invention patent with authorization announcement number CN111964029B discloses an intelligent control system for the direct combustion of low-concentration gas and its use method. The patent discloses the regulation of gas with unstable concentration to ensure the efficient utilization and stable combustion of low-concentration gas and to ensure that the temperature of the combustion chamber remains within a preset range. That is, when the gas is burning, it is necessary to ensure stable combustion with small fluctuations. In addition, the patent document also discloses the mixing of air and low-concentration gas to achieve stable combustion of low-concentration gas.

[0007] It can be seen from the above three patent documents that it is necessary to mix low-concentration gas with a combustion-supporting medium to ensure stable combustion of low-concentration gas. However, the combustion-supporting medium includes air, oxygen, liquefied petroleum gas, etc., which has a different density from the gas. Therefore, in order to ensure more stable and sufficient combustion, it is necessary to stir the gas and the combustion-supporting medium to make the mixture more uniform. Based on this, the present invention proposes a combustion device based on low-concentration gas. Summary of the Invention

[0008] In order to solve the problems mentioned in the above background, the present invention provides a combustion device based on low-concentration gas.

[0009] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows.

[0010] A combustion device based on low-concentration gas includes an air pump, a burner, and two mixing components. The mixing component includes a mixing tank. A piston is provided in the mixing tank. A core hole is provided on the end surface of the piston. A detection element is provided on the upper end surface of the piston. The probe of the detection element is located in the core hole.

[0011] The end surface of the tank bottom is coaxially opened with a bottom hole, the lower opening of the bottom hole is provided with a convex tube, the outer circumferential surface of the convex tube is provided with a side nozzle, the lower end of the convex tube is closed, and the hole wall of the convex tube is provided with an inner step;

[0012] The inner step is sheathed with a rotating tube, the lower end of the rotating tube is closed, the upper end is provided with a support, the outer surface of the rotating tube is provided with a lower air hole, and the outer sheath of the rotating tube is provided with a spring 1 located between the inner step and the support;

[0013] A bevel gear 1 is installed in the support. The gear shaft of the bevel gear 1 is in the shape of a hollow shaft coaxial with the rotating tube. The lower open end of the gear shaft is rotatably connected to the rotating tube. The upper end of the gear shaft is closed. An upper air hole is opened on the outer surface of the gear shaft. The upper air hole is connected to the internal space of the support. The upper and lower ends of the support are closed.

[0014] Blades are installed on the support along the radial direction of the rotating tube, and a second bevel gear meshing with the first bevel gear is provided on a connecting shaft formed at the installation position.

[0015] Furthermore, a coil spring is provided between the gear shaft of the bevel gear 1 and the support. Initially, under the action of the coil spring, the blades are arranged at an inclination.

[0016] Furthermore, a connecting rod is provided at the upper end of the piston, the upper end of the connecting rod extends out of the mixing tank and is provided with a lifting bracket, and the mixing component also includes a linear module for driving the lifting bracket to move in a vertical direction.

[0017] Furthermore, a pressure gauge is provided at the bottom of the mixing tank.

[0018] Furthermore, the blades are located in the mixing tank, the interior of the blades is hollow and the outer surface is provided with air injection holes, the connecting shaft is in the shape of a hollow shaft, and a plurality of blades are arranged in an array along the circumferential direction of the rotating tube.

[0019] Furthermore, a rotating shaft extends coaxially from the lower end of the rotating tube, and a convex tube extends out from the lower end of the rotating shaft. The mixing component also includes a motor. The rotating shaft and the motor are powered by a power transmission member. The driven member of the power transmission member is connected to the rotating shaft by a connecting member. When the rotating shaft moves along the axis direction, the driven member maintains power connection with the rotating shaft through the connecting member.

[0020] Furthermore, the upper and lower surfaces of the blades are both provided with convex shafts, which are coaxial with the connecting shaft;

[0021] The upper end surface of the tank bottom is provided with a lower arc groove;

[0022] An intermediate groove and a receiving groove are provided at the middle position of the lower end surface of the piston, and an upper arc groove is provided at the bottom of the receiving groove;

[0023] Initially, the lower arc groove is located directly below the convex shaft, and the upper arc groove is located directly above the convex shaft. The lower arc groove or the upper arc groove can accommodate the convex shaft, the accommodating groove can accommodate the blade, and the middle groove can accommodate the support.

[0024] Furthermore, a connecting branch pipe is provided at the end of the side nozzle, and the two connecting branch pipes are connected by a connecting main pipe. A first nozzle and a second nozzle are provided on the outer circumference of the connecting branch pipe. The outlet end of the air pump is connected to the first nozzle on the two connecting branch pipes through the outlet pipe. The end of the second nozzle is connected to the combustion medium supply source. The air inlet end of the air pump is provided with an air connecting pipe.

[0025] A valve three is provided at the connection between the connecting main pipe and the connecting branch pipe, a valve one is provided at the connection between the connecting nozzle one and the air outlet pipe, a valve two is provided at the connection between the connecting nozzle two and the combustion medium supply source, an air outlet nozzle is provided on the outer circular surface of the connecting main pipe, and the air outlet nozzle and the burner are connected through a pressure valve.

[0026] Furthermore, the pressure valve includes a valve tube arranged between the air outlet nozzle and the burner, the valve tube is composed of two coaxial cylindrical tubes of unequal diameters, a shaft shoulder is formed at the connection of the two cylindrical tubes, a valve plug is sleeved inside the cylindrical tube with a larger diameter of the valve tube, and a second spring is arranged between the valve plug and the valve tube. Initially, the elastic force of the second spring drives the valve plug to fit the shaft shoulder and the valve hole arranged on the valve plug is not connected to the cylindrical tube with a smaller diameter of the valve tube, and the cylindrical tube with a smaller diameter of the valve tube is connected to the air outlet nozzle.

[0027] Furthermore, the burner includes a combustion chamber, a smoke exhaust pipe is provided at the upper end of the combustion chamber, a lower burner is provided in the combustion chamber, an upper burner is provided above the lower burner, a heat storage body is provided above the upper burner, the interior of the heat storage body is hollow and is provided with a spiral pipe, one end of the spiral pipe is connected to the upper burner through pipe 2, and the other end of the spiral pipe is connected to the pressure valve through pipe 1.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This solution can mix low-concentration gas with a combustion-supporting medium to achieve combustion of low-concentration gas. Specifically, this solution detects the gas concentration in the mixing tank, injects a preset amount of combustion-supporting medium into the mixing tank according to the detection result, and then mixes the gas and the combustion-supporting medium. After mixing, the piston moves downward to inject the mixed gas into the burner for combustion. In this process, on the one hand, the amount of the combustion-supporting medium corresponds to the amount of the gas, which can ensure that the gas can be fully burned in the subsequent combustion to prevent incomplete combustion. In addition, there will be no fluctuations in combustion due to too much or too little combustion-supporting medium. On the other hand, the setting of the pressure valve can drive the speed of the mixed gas injected into the burner to be constant to prevent fluctuations in combustion. In short, it can achieve full combustion of low-concentration gas and stable combustion. On this basis:

[0030] Initially, the blades are arranged at an angle, so the stirring effect on the gas in the mixing tank is better, and the gas and the combustion medium can be mixed evenly. During the combustion process after the stirring is completed, when the piston contacts the bottom of the mixing tank, the blades can be arranged horizontally and hidden in the receiving groove. The two cams are hidden in the upper arc groove and the lower arc groove respectively, and the support is hidden in the middle groove. The coil spring and the spring are compressed. Therefore, the mixed gas in the mixing tank can be completely pushed out by the downward movement of the piston. The advantage is that it prevents residual mixed gas from remaining in the mixing tank. The residual mixed gas will interfere with the gas concentration detection in the next mixing process, resulting in excessive amount of combustion medium injected, which will cause subsequent combustion to fluctuate and the combustion is not stable enough. However, this solution pushes out all the mixed gas in the mixing tank, so there is no problem of interference from residual mixed gas. Then, during the next mixing process, the piston moves up, the coil spring and the spring release their elastic force, and the blades gradually return to their original position. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 Schematic diagram of the connection between the air pump and the two mixing components;

[0033] Figure 3 Schematic diagram of the interior of the mixing component when the piston is in contact with the tank bottom;

[0034] Figure 4 This is a schematic diagram of the interior of the mixing component when stirring occurs in the mixing tank;

[0035] Figure 5 Schematic diagram of the lower end surface of the piston;

[0036] Figure 6 Schematic diagram of the structure of the tank bottom;

[0037] Figure 7 It is a cross-sectional view of the tank bottom and blades;

[0038] Figure 8 is a cross-sectional view of the tank bottom;

[0039] Figure 9 It is a cross-sectional view of the blade, support, rotating tube and rotating shaft;

[0040] Figure 10 is a schematic diagram of a blade;

[0041] Figure 11 is a cross-sectional view of the burner;

[0042] Figure 12 A cross-sectional view of a pressure valve.

[0043] The reference numerals in the accompanying drawings are:

[0044] 100. Air pump; 101. Air connection pipe; 102. Air outlet pipe; 103. Connecting main pipe; 104. Pressure valve; 1041. Valve pipe; 1042. Valve plug; 1043. Valve hole; 1044. Spring 2; 105. Connecting branch pipe; 106. Valve 1; 107. Valve 2; 108. Valve 3; 200. Mixing component; 201. Mixing tank; 202. Linear module; 203. Piston; 2031. Middle groove; 2032. Accommodating groove; 2033. Upper arc groove; 204. Connecting rod; 205. Lifting bracket; 206. Detection element; 207. Pressure gauge; 208. Motor; 209. Power transmission Components; 210, tank bottom; 2101, lower arc groove; 211, blades; 2111, connecting shaft; 2112, air injection hole; 2113, convex shaft; 212, convex pipe; 2121, side nozzle; 2122, inner step; 213, spring 1; 214, rotating tube; 2141, lower air hole; 215, rotating shaft; 216, support; 217, bevel gear 1; 218, coil spring; 219, bevel gear 2; 300, burner; 301, combustion chamber; 302, exhaust pipe; 303, lower burner; 304, upper burner; 305, heat storage body; 306, pipe 1; 307, spiral pipe; 308, pipe 2. DETAILED DESCRIPTION

[0045] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0046] Reference Figures 1-12A combustion device based on low-concentration gas includes an air pump 100, a burner 300 and a mixing component 200. When in use, the air pump 100 draws the low-concentration gas into the mixing component 200. The mixing component 200 is used to monitor the concentration of the gas and calculate the amount of the combustion medium to be added according to the concentration. This is achievable with the existing technology and will not be described in detail. Then, a corresponding amount of the combustion medium is injected into the mixing component 200. The combustion medium can be oxygen, air, etc. The combustion medium and the gas are fully mixed in the mixing component 200. After mixing, the mixed gas It is sent into the burner 300 for combustion. It should be noted that: during the combustion process, the mixing component 200 can inject all the mixed gas inside itself into the burner 300 as much as possible. The advantage is that the concentration of low-concentration gas is uncontrollable, and the concentration is different each time. Injecting all of it into the burner 300 can prevent the previous mixed gas from interfering with the next mixing process; in addition, the mixed gas can be injected into the burner 300 at a constant speed, making the combustion more stable and sufficient, and the combustion fluctuations are smaller, which is conducive to the completeness of combustion, reduces the exhaust gas generated by incomplete combustion, and is more environmentally friendly.

[0047] Furthermore, two mixing components 200 are provided, and the two mixing components 200 are used alternately to ensure uninterrupted combustion.

[0048] 1. Hybrid component 200:

[0049] Reference Figure 2-Figure 10 The mixing component 200 includes a mixing tank 201, a piston 203 is provided in the mixing tank 201, a connecting rod 204 is provided on the upper end of the piston 203, the upper end of the connecting rod 204 extends out of the mixing tank 201 and is connected to the lifting bracket 205, and the lifting bracket 205 is driven by the linear module 202 to move in the vertical direction, thereby driving the piston 203 to move in the mixing tank 201. The linear module 202 can adopt the existing electric telescopic rod technology or the existing screw linear motion technology, etc., which will not be elaborated.

[0050] A core hole is provided on the end face of the piston 203, and a detection element 206 is provided on the upper end face of the piston 203. The probe of the detection element 206 is located in the core hole and is used to detect the gas concentration in the mixing tank 201. Existing sensor technology can be used and will not be elaborated on.

[0051] A pressure gauge 207 is provided at the tank bottom 210 of the mixing tank 201 .

[0052] A bottom hole is coaxially opened on the end face of the tank bottom 210 , a convex tube 212 is provided at the lower opening of the bottom hole, a side nozzle 2121 is provided on the outer circumferential surface of the convex tube 212 , the lower end of the convex tube 212 is closed, and an inner step 2122 is provided on the hole wall of the convex tube 212 .

[0053] The inner step 2122 is in the shape of a ring, and a rotating tube 214 is installed inside. The lower end of the rotating tube 214 is closed, and a support 216 is provided at the upper end. A lower air hole 2141 is opened on the outer circular surface of the rotating tube 214, and a spring 213 is installed outside the rotating tube 214 and is located between the inner step 2122 and the support 216.

[0054] A bevel gear 217 is installed in the support 216. The gear shaft of the bevel gear 217 is in the shape of a hollow shaft coaxial with the rotating tube 214. The lower open end of the gear shaft is rotationally connected to the rotating tube 214, for example, through a bearing. The upper end of the gear shaft is closed, and an upper air hole is opened on the outer cylindrical surface of the gear shaft. The upper air hole is connected to the internal space of the support 216. The upper and lower ends of the support 216 are closed, and the upper end surface of the support 216 is set to a horizontal plane.

[0055] The support 216 is provided with blades 211 along the radial direction of the rotating tube 214, and a bevel gear 219 is provided on the connecting shaft 2111 formed at the installation position. The bevel gear 219 is engaged with the bevel gear 1 217. A coil spring 218 is provided between the gear shaft of the bevel gear 1 217 and the support 216. Initially, under the action of the coil spring 218, the blades 211 are arranged at an angle.

[0056] The blade 211 is located in the mixing tank 201. The interior of the blade 211 is hollow and the outer surface is provided with an air injection hole 2112. The connecting shaft 2111 is in the shape of a hollow shaft. Therefore, low-concentration gas or combustion-supporting medium can enter the convex tube 212 through the side nozzle 2121, and then enter the blade 211 through the lower air hole 2141, the rotating tube 214, the gear shaft of the bevel gear 217, the internal space of the support 216, the connecting shaft 2111, and enter the mixing tank 201 through the air injection hole 2112.

[0057] A rotating shaft 215 extends coaxially from the lower end of the rotating tube 214, and the lower end of the rotating shaft 215 extends out of the convex tube 212. The rotating shaft 215 and the motor 208 are powered by a power transmission member 209. The follower of the power transmission member 209 is connected to the rotating shaft 215 through a connecting member. When the rotating shaft 215 moves along the axis direction, the follower maintains power connection with the rotating shaft 215 through the connecting member. Preferably, the connecting member can be an external spline provided on the rotating shaft 215 and an internal spline provided on the follower, and the follower can only rotate but not move; the motor 208 can drive the blades 211 to rotate in the mixing tank 201 to achieve stirring of the gas in the mixing tank 201, and a plurality of blades 211 are arranged in an array along the circumferential direction of the rotating shaft 215.

[0058] Reference Figure 10 The upper surface and the lower surface of the blade 211 are both provided with a convex shaft 2113, and the convex shaft 2113 is coaxial with the connecting shaft 2111.

[0059] Reference Figure 8 The upper end surface of the tank bottom 210 is provided with a lower arc groove 2101.

[0060] Reference Figure 5 An intermediate groove 2031 and an accommodating groove 2032 are provided at the middle position of the lower end surface of the piston 203 , and an upper arc groove 2033 is provided at the bottom of the accommodating groove 2032 .

[0061] Initially, the lower arc groove 2101 is located directly below the convex shaft 2113, and the upper arc groove 2033 is located directly above the convex shaft 2113. The lower arc groove 2101 or the upper arc groove 2033 can accommodate the convex shaft 2113, the accommodating groove 2032 can accommodate the blade 211, and the middle groove 2031 can accommodate the support 216. In addition, the motor 208 is a servo motor, and its number of rotations is controllable. Therefore, when the piston 203 moves downward, it can press the blade 211 to switch to a horizontal arrangement. When the piston 203 is in contact with the bottom of the tank, the blade 211 is pressed against the bottom of the tank. 210, the blade 211 is arranged horizontally and hidden in the accommodating groove 2032, the two convex shafts 2113 are respectively hidden in the upper arc groove 2033 and the lower arc groove 2101, the support 216 is hidden in the middle groove 2031, and the coil spring 218 and the spring 1 213 are compressed. Therefore, the mixed gas in the mixing tank 201 can be pushed out by the downward movement of the piston 203. Afterwards, when the piston 203 moves upward, the coil spring 218 and the spring 1 213 release the elastic force, and the blade 211 gradually returns to its original position.

[0062] 2. Connection relationship between the air pump 100 and the two mixing components 200:

[0063] Reference Figure 2 and Figure 6 The end of the side nozzle 2121 is provided with a connecting branch pipe 105, and the two connecting branch pipes 105 are connected by a connecting main pipe 103. The outer cylindrical surface of the connecting branch pipe 105 is provided with a nozzle 1 and a nozzle 2. The outlet end of the air pump 100 is connected to the nozzle 1 on the two connecting branch pipes 105 through an outlet pipe 102. The end of the nozzle 2 is connected to the combustion-supporting medium supply source. The combustion-supporting medium supply source is not shown in the figure. The existing pump technology can be used to pump the combustion-supporting medium into the nozzle 2. The air inlet end of the air pump 100 is provided with an air connecting pipe 101, and the end of the air connecting pipe 101 is used to receive low-concentration gas.

[0064] A valve 3 108 is provided at the connection between the connecting main pipe 103 and the connecting branch pipe 105 , a valve 106 is provided at the connection between the connecting nozzle 1 and the gas outlet pipe 102 , and a valve 2 107 is provided at the connection between the connecting nozzle 2 and the combustion medium supply source.

[0065] Valve 1 106 is opened, valve 2 107 and valve 3 108 are closed, and low-concentration gas is drawn by the air pump 100, flows through the gas connection pipe 101, the gas outlet pipe 102, and the connecting branch pipe 105 to the side nozzle 2121, and then flows into the mixing tank 201;

[0066] Valve 2 107 is opened, valve 106 and valve 3 108 are closed, and the combustion-supporting medium flows through nozzle 2 and connecting branch pipe 105 to side nozzle 2121, and then flows into mixing tank 201;

[0067] Valve three 108 is opened, valve one 106 and valve two 107 are closed, and the piston 203 moves downward, which can push the mixed gas in the mixing tank 201 out, and the mixed gas flows into the connecting main pipe 103 through the side nozzle 2121 and the connecting branch pipe 105. The outer circular surface of the connecting main pipe 103 is provided with an air outlet nozzle, and the air outlet nozzle and the burner 300 are connected through the pressure valve 104. Therefore, the mixed gas can pass through the pressure valve 104 and enter the burner 300.

[0068] Reference Figure 12 The pressure valve 104 includes a valve tube 1041 arranged between the air outlet nozzle and the burner 300. The valve tube 1041 is composed of two coaxial cylindrical tubes with unequal diameters. A shaft shoulder is formed at the connection of the two cylindrical tubes. A valve plug 1042 is sleeved in the cylindrical tube with a larger diameter of the valve tube 1041. A spring 2 1044 is arranged between the valve plug 1042 and the valve tube 1041. Initially, the elastic force of the spring 2 1044 drives the valve plug 1042 to fit into the shaft shoulder and the valve hole 1043 arranged on the valve plug 1042 is not connected to the cylindrical tube with a smaller diameter of the valve tube 1041.

[0069] The mixed gas needs to overcome the elastic force of spring 2 1044 and push the valve plug 1042 back, so that the valve hole 1043 is connected with the cylindrical tube with a small diameter of the valve pipe 1041. Only then can the mixed gas pass through the pressure valve 104, that is, in the process of mixing low-concentration gas and combustion-supporting medium in the mixing tank 201, the air pressure in the mixing tank 201 is not enough to overcome the elastic force of spring 2 1044 and make the valve plug 1042 retreat. When the mixing is completed, the piston 203 moves downward and can push the valve plug 1042 back. Therefore, the piston 203 keeps moving downward at a constant speed, and the amount of mixed gas injected into the burner 300 is a constant value.

[0070] 3. Burner 300:

[0071] Reference Figure 11The burner 300 includes a combustion chamber 301, a smoke exhaust pipe 302 is provided at the upper end of the combustion chamber 301, a lower stove head 303 is provided in the combustion chamber 301, an upper stove head 304 is provided above the lower stove head 303, a heat storage body 305 is provided above the upper stove head 304, the interior of the heat storage body 305 is hollow and is provided with a spiral pipe 307, one end of the spiral pipe 307 is connected to the upper stove head 304 through a pipe 2 308, and the other end of the spiral pipe 307 is connected to the pressure valve 104 through a pipe 1 306.

[0072] The mixed gas enters the spiral pipe 307 through pipe 1 306, and after being preheated, enters the upper burner 304 through pipe 2 308 for combustion. It should be noted that, at the beginning, the lower burner 303 burns fuel such as natural gas to provide heat for the heat storage body 305. After the mixed gas starts to burn, the lower burner 303 stops burning.

[0073] Working principle of the present invention:

[0074] 1. Mixing:

[0075] Valve 106 is open, valve 2 107 and valve 3 108 are closed, and low-concentration gas is drawn by the air pump 100, passes through the air inlet pipe 101, the air outlet pipe 102, the connecting branch pipe 105, and the side nozzle 2121 into the convex pipe 212, and then passes through the lower air hole 2141, the rotating pipe 214, the gear shaft of the bevel gear 1 217, the internal space of the support 216, the connecting shaft 2111 into the blade 211, and enters the mixing tank 201 through the air injection hole 2112;

[0076] During the injection of gas into the mixing tank 201, the piston 203 needs to move upward accordingly. After a preset time, a preset amount of gas is injected into the mixing tank 201, and the injection is stopped. The valve 106 is closed, and the pressure in the mixing tank 201 can be detected by the pressure gauge 207 to calculate the amount of gas injected into the mixing tank 201.

[0077] The gas concentration in the mixing tank 201 is detected by the detection element 206, and the amount of the combustion-supporting medium to be injected into the mixing tank 201 is obtained according to the detection result;

[0078] Valve 2 107 is opened, valve 1 106 and valve 3 108 are closed, and the combustion-supporting medium flows through nozzle 2 and connecting branch pipe 105 to side nozzle 2121, and then flows into mixing tank 201. After the combustion-supporting medium is injected into a preset amount, the injection is stopped and valve 2 107 is closed;

[0079] The motor 208 drives the rotating shaft 215 to rotate, thereby driving the blades 211 to rotate. The blades 211 are initially arranged at an angle, so the rotation has a good stirring effect. Preferably, during the injection of the combustion-supporting medium, the blades 211 can start to rotate. Under the action of centrifugal force, the combustion-supporting medium has an initial velocity, which can further improve the stirring effect.

[0080] 2. Combustion:

[0081] After the preset time, the gas and the combustion medium are mixed;

[0082] Valve three 108 is opened, valve one 106 and valve two 107 are closed, and the piston 203 moves downward, which can push the mixed gas in the mixing tank 201 out. The mixed gas enters the spiral pipe 307 through the side nozzle 2121, the connecting branch pipe 105, the connecting main pipe 103, the air outlet nozzle, the pressure valve 104 and the pipe one 306. After being preheated, it enters the upper stove head 304 through the pipe two 308 for combustion.

[0083] From the above description we can see that:

[0084] This solution can mix low-concentration gas with a combustion-supporting medium to achieve combustion of low-concentration gas. Specifically, this solution detects the gas concentration in the mixing tank, injects a preset amount of combustion-supporting medium into the mixing tank according to the detection result, and then mixes the gas and the combustion-supporting medium. After mixing, the piston moves downward to inject the mixed gas into the burner for combustion. In this process, on the one hand, the amount of the combustion-supporting medium corresponds to the amount of the gas, which can ensure that the gas can be fully burned in the subsequent combustion to prevent incomplete combustion. In addition, there will be no fluctuations in combustion due to too much or too little combustion-supporting medium. On the other hand, the setting of the pressure valve can drive the speed of the mixed gas injected into the burner to be constant to prevent fluctuations in combustion. In short, it can achieve full combustion of low-concentration gas and stable combustion. On this basis:

[0085] Initially, the blades are arranged at an angle, so the stirring effect on the gas in the mixing tank is better, and the gas and the combustion medium can be mixed evenly. During the combustion process after the stirring is completed, when the piston contacts the bottom of the mixing tank, the blades can be arranged horizontally and hidden in the receiving groove. The two cams are hidden in the upper arc groove and the lower arc groove respectively, and the support is hidden in the middle groove. The coil spring and the spring are compressed. Therefore, the mixed gas in the mixing tank can be completely pushed out by the downward movement of the piston. The advantage is that it prevents residual mixed gas from remaining in the mixing tank. The residual mixed gas will interfere with the gas concentration detection in the next mixing process, resulting in excessive amount of combustion medium injected, which will cause subsequent combustion to fluctuate and the combustion is not stable enough. However, this solution pushes out all the mixed gas in the mixing tank, so there is no problem of interference from residual mixed gas. Then, during the next mixing process, the piston moves up, the coil spring and the spring release their elastic force, and the blades gradually return to their original position.

[0086] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A combustion device based on low-concentration gas, comprising an air pump (100), a burner (300) and two mixing components (200), characterized in that: The mixing component (200) comprises a mixing tank (201), wherein a piston (203) is provided in the mixing tank (201), a core hole is provided on the end surface of the piston (203), a detection element (206) is provided on the upper end surface of the piston (203), and a probe of the detection element (206) is located in the core hole; A bottom hole is coaxially formed on the end surface of the tank bottom (210) of the mixing tank (201); a convex tube (212) is provided at the lower opening of the bottom hole; a side nozzle (2121) is provided on the outer circumferential surface of the convex tube (212); the lower end of the convex tube (212) is closed; and an inner step (2122) is provided on the hole wall of the convex tube (212); The inner step (2122) is provided with a rotating tube (214), the lower end of the rotating tube (214) is closed, and the upper end is provided with a support (216), the outer circumferential surface of the rotating tube (214) is provided with a lower air hole (2141), and the outer surface of the rotating tube (214) is provided with a spring (213) located between the inner step (2122) and the support (216); A bevel gear 1 (217) is installed in the support (216). The gear shaft of the bevel gear 1 (217) is in the shape of a hollow shaft coaxial with the rotating tube (214). The lower open end of the gear shaft is rotatably connected to the rotating tube (214). The upper end of the gear shaft is closed. The outer surface of the gear shaft is provided with an upper air hole. The upper air hole is connected to the internal space of the support (216). The upper and lower ends of the support (216) are closed. A blade (211) is mounted on the support (216) along the radial direction of the rotating tube (214), and a second bevel gear (219) meshing with the first bevel gear (217) is provided on a connecting shaft (2111) formed at the mounting location. A coil spring (218) is provided between the gear shaft of the bevel gear 1 (217) and the support (216). Initially, under the action of the coil spring (218), the blades (211) are arranged in an inclined manner; A connecting rod (204) is provided at the upper end of the piston (203); the upper end of the connecting rod (204) extends out of the mixing tank (201) and is provided with a lifting bracket (205); the mixing component (200) further includes a linear module (202) for driving the lifting bracket (205) to move in a vertical direction; The blade (211) is located in the mixing tank (201), the interior of the blade (211) is hollow and an air injection hole (2112) is provided on the outer surface. The connecting shaft (2111) is in the shape of a hollow shaft, and a plurality of blades (211) are arranged in an array along the circumferential direction of the rotating tube (214); A rotating shaft (215) coaxially extends from the lower end of the rotating tube (214), and the lower end of the rotating shaft (215) extends out of the convex tube (212). The mixing component (200) further includes a motor (208). The rotating shaft (215) and the motor (208) are connected to each other through a power transmission member (209). A driven member of the power transmission member (209) is connected to the rotating shaft (215) through a connecting member. When the rotating shaft (215) moves along the axis direction, the driven member maintains a power connection with the rotating shaft (215) through the connecting member. The upper surface and the lower surface of the blade (211) are both provided with a convex shaft (2113), and the convex shaft (2113) is coaxial with the connecting shaft (2111); The upper end surface of the tank bottom (210) is provided with a lower arc groove (2101); An intermediate groove (2031) and an accommodating groove (2032) are provided at the middle position of the lower end surface of the piston (203), and an upper arc groove (2033) is provided at the bottom of the accommodating groove (2032); Initially, the lower arc groove (2101) is located directly below the convex shaft (2113), and the upper arc groove (2033) is located directly above the convex shaft (2113). The lower arc groove (2101) or the upper arc groove (2033) can accommodate the convex shaft (2113), the accommodating groove (2032) can accommodate the blade (211), and the middle groove (2031) can accommodate the support (216).

2. A combustion device based on low-concentration gas according to claim 1, characterized in that: A pressure gauge (207) is provided at the tank bottom (210) of the mixing tank (201).

3. A combustion device based on low-concentration gas according to claim 1, characterized in that: The end of the side nozzle (2121) is provided with a connecting branch pipe (105), the two connecting branch pipes (105) are connected via a connecting main pipe (103), the outer circumferential surface of the connecting branch pipe (105) is provided with a first nozzle and a second nozzle, the outlet end of the air pump (100) and the first nozzle on the two connecting branch pipes (105) are connected via an outlet pipe (102), the end of the second nozzle is connected to a combustion medium supply source, and the air inlet end of the air pump (100) is provided with an air pipe (101); A valve 3 (108) is provided at the connection point between the connecting main pipe (103) and the connecting branch pipe (105), a valve 1 (106) is provided at the connection point between the connecting nozzle 1 and the gas outlet pipe (102), a valve 2 (107) is provided at the connection point between the connecting nozzle 2 and the combustion medium supply source, and a gas outlet nozzle is provided on the outer cylindrical surface of the connecting main pipe (103), and the gas outlet nozzle and the burner (300) are connected via a pressure valve (104).

4. A combustion device based on low-concentration gas according to claim 3, characterized in that: The pressure valve (104) includes a valve tube (1041) arranged between the air outlet nozzle and the burner (300). The valve tube (1041) is composed of two coaxial cylindrical tubes of unequal diameters. A shaft shoulder is formed at the connection of the two cylindrical tubes. A valve plug (1042) is sleeved inside the cylindrical tube with a larger diameter of the valve tube (1041). A second spring (1044) is arranged between the valve plug (1042) and the valve tube (1041). Initially, the elastic force of the second spring (1044) drives the valve plug (1042) to fit the shaft shoulder and the valve hole (1043) arranged on the valve plug (1042) is not connected to the cylindrical tube with a smaller diameter of the valve tube (1041). The cylindrical tube with a smaller diameter of the valve tube (1041) is connected to the air outlet nozzle.

5. A combustion device based on low-concentration gas according to claim 4, characterized in that: The burner (300) includes a combustion chamber (301), a smoke exhaust pipe (302) is provided at the upper end of the combustion chamber (301), a lower stove head (303) is provided in the combustion chamber (301), an upper stove head (304) is provided above the lower stove head (303), a heat storage body (305) is provided above the upper stove head (304), the interior of the heat storage body (305) is hollow and provided with a spiral pipe (307), one end of the spiral pipe (307) is connected to the upper stove head (304) through a second pipe (308), and the other end of the spiral pipe (307) is connected to the pressure valve (104) through a first pipe (306).

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