Combustion device based on low-concentration gas

Abstract

The invention relates to the field of gas combustion, and discloses a combustion device based on low-concentration gas, which comprises a gas pump, a combustor and two mixing members, each mixing member comprises a mixing tank, a piston is sleeved in the mixing tank, the upper end face of the piston is provided with a detection element, the bottom of the tank bottom is coaxially provided with a convex pipe, the hole wall of the convex pipe is provided with an inner step, and the inner step is provided with an outer step; a rotating pipe is sleeved with the inner step, a support is arranged at the upper end of the rotating pipe, a lower air hole is formed in the outer circle face of the rotating pipe, the rotating pipe is sleeved with a first spring located between the inner step and the support, a first bevel gear is installed in the support, a gear shaft of the first bevel gear is rotationally connected with the rotating pipe, and an upper air hole is formed in the outer circle face of the gear shaft. Blades are installed on the support in the radial direction of the rotating pipe, a second bevel gear meshed with the first bevel gear is arranged on a connecting shaft formed at the installation position, a coil spring is arranged between the first bevel gear and the support, and at the beginning, under the action of the coil spring, the blades are arranged in an inclined mode.

Description

Technical Field

[0001] The 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 coal mining, coal mine gas needs to be treated, usually by combustion.

[0003] Based on the search for low-concentration gas combustion in coal mining, some existing technologies have been found, 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 the low-concentration gas and liquefied petroleum gas. The mixed gas is easy to burn stably;

[0005] The Chinese invention patent application with application publication number CN103016202A discloses a method for generating electricity using low-concentration coal mine gas, which is obtained by mixing low-concentration gas with air, and then feeding the mixed combustion gas into a burner for combustion;

[0006] The Chinese invention patent with authorization announcement number CN111964029B discloses an intelligent control system for direct combustion of low-concentration gas and its use method. The patent discloses regulating gas with unstable concentration to ensure efficient utilization and stable combustion of low-concentration gas and to ensure that the temperature of the combustion chamber is maintained within a preset range. That is, when the gas is burning, it is necessary to ensure that the combustion is stable and the fluctuation is small. In addition, the patent document also discloses mixing air with 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 the low-concentration gas with the combustion-supporting medium to ensure the stable combustion of the low-concentration gas. However, the combustion-supporting medium includes air, oxygen, liquefied petroleum gas, etc., which have different densities 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 solution adopted by the present invention is 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 sleeved in the mixing tank. A core hole is opened on the end surface of the piston. A detection element is arranged on the upper end surface of the piston. The probe of the detection element is located in the core hole.

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

[0012] A rotating tube is sleeved inside the inner step, the lower end of the rotating tube is closed, and a support is arranged at the upper end. A lower air hole is opened on the outer circumference of the rotating tube, and a spring 1 located between the inner step and the support is sleeved outside the rotating tube;

[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 with the rotating tube. The upper end of the gear shaft is closed. An upper air hole is opened on the outer circumference of the gear shaft. The upper air hole is connected with 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 bevel gear 2 meshing with the bevel gear 1 is arranged on the connecting shaft formed at the installation position.

[0015] Furthermore, a coil spring is arranged 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 the lower end of the rotating shaft extends out of the convex tube. 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 surface and the lower surface of the blade are both provided with convex shafts, and the convex shafts 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 arranged at the middle position of the lower end surface of the piston, and an upper arc groove is arranged at the bottom of the receiving groove;

[0023] Initially, the lower arc groove is located directly below the cam shaft, and the upper arc groove is located directly above the cam shaft. The lower arc groove or the upper arc groove can accommodate the cam 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 through a connecting main pipe, and a connecting nozzle 1 and a connecting nozzle 2 are provided on the outer circumferential surface of the connecting branch pipe, and the gas outlet end of the air pump is connected to the connecting nozzle 1 on the two connecting branch pipes through the gas outlet pipe, and the end of the connecting nozzle 2 is connected to the combustion medium supply source, and the gas inlet end of the air pump is provided with a gas connecting pipe;

[0025] A valve three is arranged at the connection between the connecting main pipe and the connecting branch pipe, a valve one is arranged at the connection between the connecting nozzle one and the air outlet pipe, a valve two is arranged at the connection between the connecting nozzle two and the combustion medium supply source, an air outlet nozzle is arranged on the outer cylindrical 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 stove head is provided in the combustion chamber, an upper stove head is provided above the lower stove head, a heat storage body is provided above the upper stove head, the interior of the heat storage body is hollow and provided with a spiral pipe, one end of the spiral pipe is connected to the upper stove head through pipe two, and the other end of the spiral pipe is connected to the pressure valve through pipe one.

[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 during 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-supporting 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, the support is hidden in the middle groove, and 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-supporting 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, in the next mixing process, the piston moves up, the coil spring and the spring release the 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 It is a schematic diagram of the connection between the air pump and the two mixing components;

[0033] Figure 3 is a schematic diagram of the interior of the mixing member when the piston is in contact with the tank bottom;

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

[0035] Figure 5 is a schematic diagram of the lower end surface of the piston;

[0036] Figure 6 It is a 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] Fig. 9 It is a cross-sectional view of the blade, the support, the rotating tube and the rotating shaft;

[0040] Fig.10 is a schematic diagram of a blade;

[0041] Fig.11 is a cross-sectional view of a burner;

[0042] Fig.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, receiving groove; 2033, upper arc groove; 204, connecting rod; 205, lifting bracket; 206, detection element; 207, pressure gauge; 208, motor; 209, power transmission 1. Parts; 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 one; 214, rotating tube; 2141, lower air hole; 215, rotating shaft; 216, support; 217, bevel gear one; 218, coil spring; 219, bevel gear two; 300, burner; 301, combustion chamber; 302, exhaust pipe; 303, lower stove head; 304, upper stove head; 305, heat storage body; 306, pipeline one; 307, spiral pipeline; 308, pipeline two. DETAILED DESCRIPTION

[0045] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0046] Reference Figure 1-Figure 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 in the prior art 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 complete, with smaller combustion fluctuations, which is beneficial 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 sleeved in the mixing tank 201, a connecting rod 204 is arranged 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 a 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 formed 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 herein.

[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 circular ring, and a rotating tube 214 is sleeved 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 located between the inner step 2122 and the support 216 is sleeved outside the rotating tube 214.

[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 rotatably 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 as 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 meshed with the bevel gear 1 217, and 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 an air injection hole 2112 is provided on the outer surface. The connecting shaft 2111 is in the shape of a hollow shaft. Therefore, low-concentration gas or combustion-supporting medium can enter the convex pipe 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 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 axial centerline direction, the driven member maintains power connection with the rotating shaft 215 through the connecting member. Preferably, the connecting member can be an external spline arranged on the rotating shaft 215 and an internal spline arranged on the driven member, and the driven member 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. A plurality of blades 211 are arranged in an array along the circumferential direction of the rotating shaft 215.

[0058] Reference Fig.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 A middle groove 2031 and a receiving 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 receiving 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 at the bottom of the tank, the blade 211 is pressed against the bottom of the tank. 210 contacts, the blade 211 is horizontally arranged 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 A connecting branch pipe 105 is provided at the end of the side nozzle 2121, and the two connecting branch pipes 105 are connected by a connecting main pipe 103. A nozzle 1 and a nozzle 2 are provided on the outer circumferential surface of the connecting branch pipe 105. The gas 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 a combustion-supporting medium supply source. The combustion-supporting medium supply source is not shown in the figure, and the existing pump technology can be used to pump the combustion-supporting medium into the nozzle 2. An air inlet pipe 101 is provided at the air inlet end of the air pump 100, and the end of the air inlet pipe 101 is used to receive low-concentration gas.

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

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

[0066] The second valve 107 is opened, the first valve 106 and the third valve 108 are closed, and the combustion medium flows to the side nozzle 2121 through the second nozzle and the connecting branch pipe 105, and then flows into the mixing tank 201;

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

[0068] Reference Fig.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 of 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 1044 is arranged between the valve plug 1042 and the valve tube 1041. Initially, the elastic force of the spring 1044 drives the valve plug 1042 to fit against the shaft shoulder and the valve hole 1043 arranged on the valve plug 1042 is not connected with the cylindrical tube with a smaller diameter of the valve tube 1041.

[0069] The mixed gas needs to overcome the elastic force of the second spring 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, and the mixed gas can 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 gas pressure in the mixing tank 201 is not enough to overcome the elastic force of the second spring 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 Fig.11The burner 300 includes a combustion chamber 301, a smoke exhaust pipe 302 is arranged at the upper end of the combustion chamber 301, a lower stove head 303 is arranged in the combustion chamber 301, an upper stove head 304 is arranged above the lower stove head 303, a heat storage body 305 is arranged 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 stove head 304 through pipe 2 308 for combustion. It should be noted that, at the beginning, the lower stove head 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 stove head 303 stops burning.

[0073] Working principle of the present invention:

[0074] 1. Mixing:

[0075] The valve 106 is opened, the valve 2 107 and the valve 3 108 are closed, and the low-concentration gas is drawn by the gas pump 100, enters the convex pipe 212 through the gas connection pipe 101, the gas outlet pipe 102, the connecting branch pipe 105, and the side nozzle 2121, and then enters the blade 211 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, and enters the mixing tank 201 through the gas injection hole 2112;

[0076] During the process of injecting 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 air pressure in the mixing tank 201 can be detected by the pressure gauge 207, so as 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] The second valve 107 is opened, the first valve 106 and the third valve 108 are closed, and the combustion-supporting medium flows to the side nozzle 2121 through the second nozzle and the connecting branch pipe 105, and then flows into the mixing tank 201. After the combustion-supporting medium is injected into a preset amount, the injection is stopped and the second valve 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] When valve three 108 is opened, valve one 106 and valve two 107 are closed, piston 203 moves downward, and mixed gas in mixing tank 201 can be pushed out, and mixed gas enters spiral pipe 307 through side nozzle 2121, connecting branch pipe 105, connecting main pipe 103, air outlet nozzle, pressure valve 104 and pipe one 306, and after being preheated, enters upper stove head 304 through pipe two 308 for combustion.

[0083] From the above description, we can know 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 during 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-supporting 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, the support is hidden in the middle groove, and 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-supporting 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, in the next mixing process, the piston moves up, the coil spring and the spring release the elastic force, and the blades gradually return to their original position.

[0086] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. 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), a piston (203) is sleeved in the mixing tank (201), a core hole is opened on the end surface of the piston (203), a detection element (206) is arranged 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), 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); A rotating tube (214) is sleeved inside the inner step (2122), 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 circumferential surface of the rotating tube (214), and a spring (213) located between the inner step (2122) and the support (216) is sleeved outside the rotating tube (214); 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. An upper air hole is opened on the outer circumferential 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. The support (216) is provided with blades (211) along the radial direction of the rotating tube (214), and a connecting shaft (2111) formed at the installation position is provided with a bevel gear 2 (219) meshing with a bevel gear 1 (217).

2. A combustion device based on low-concentration gas according to claim 1, characterized in that: A coil spring (218) is arranged 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.

3. A combustion device based on low-concentration gas according to claim 2, characterized in that: A connecting rod (204) is disposed at the upper end of the piston (203), and 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.

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

5. A combustion device based on low-concentration gas according to claim 2, characterized in that: 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 arranged 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).

6. A combustion device based on low-concentration gas according to claim 5, characterized in that: 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 by a power transmission member (209). The driven member of the power transmission member (209) is connected to the rotating shaft (215) by a connecting member. When the rotating shaft (215) moves along the axis direction, the driven member maintains power connection with the rotating shaft (215) by the connecting member.

7. A combustion device based on low-concentration gas according to claim 5, characterized in that: 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); A middle groove (2031) and a receiving 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 receiving 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).

8. A combustion device based on low-concentration gas according to claim 7, characterized in that: A connecting branch pipe (105) is provided at the end of the side nozzle (2121), and the two connecting branch pipes (105) are connected via a connecting main pipe (103). A first connecting nozzle and a second connecting nozzle are provided on the outer circumferential surface of the connecting branch pipe (105). The gas outlet end of the air pump (100) is connected to the first connecting nozzle on the two connecting branch pipes (105) via a gas outlet pipe (102). The end of the second connecting nozzle is connected to a combustion medium supply source. The gas inlet end of the air pump (100) is provided with a gas connecting pipe (101); A third valve (108) is provided at the connection between the connecting main pipe (103) and the connecting branch pipe (105), a first valve (106) is provided at the connection between the first connection nozzle and the gas outlet pipe (102), a second valve (107) is provided at the connection between the second connection nozzle and the combustion medium supply source, and a gas outlet nozzle is provided on the outer circumferential surface of the connecting main pipe (103), and the gas outlet nozzle and the burner (300) are connected via a pressure valve (104).

9. A combustion device based on low-concentration gas according to claim 8, characterized in that: The pressure valve (104) comprises a valve tube (1041) arranged between the gas 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 gas outlet nozzle.

10. A combustion device based on low-concentration gas according to claim 9, characterized in that: The burner (300) comprises a combustion chamber (301), a smoke exhaust pipe (302) is arranged at the upper end of the combustion chamber (301), a lower stove head (303) is arranged in the combustion chamber (301), an upper stove head (304) is arranged above the lower stove head (303), a heat storage body (305) is arranged 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 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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