Special methane furnace

Abstract

The invention provides a special methane furnace. The special methane furnace comprises a corrosion-resistant combustion furnace, a gas supply module and a safety buffer protection part, the corrosion-resistant combustion furnace comprises a titanium alloy inner container, a ceramic fiber heat insulation layer wrapping the outer wall of the inner container and a stainless steel shell. The gas supply module comprises an induced draft fan, the induced draft fan is arranged on the left side face of the stainless steel shell and connected with the titanium alloy inner container through a pipeline, the induced draft fan is connected with a first gas inlet pipe used for feeding biogas and a second gas inlet pipe used for feeding oxygen, and a partition plate is arranged at the left end of the titanium alloy inner container. A partition plate is arranged in the titanium alloy inner container and divides the titanium alloy inner container into a mixing area and a heating area, the pipeline is connected with the mixing area, activated carbon adsorption plates are detachably embedded in the upper end and the lower end of the pipeline through screws, and the interior of the mixing area is connected with the heating area through a first sucking pump; the biogas combustion efficiency can be improved, and the tempering hidden danger can be eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of industrial kilns, in particular to a special furnace for biogas. Background Art

[0002] Biogas, a renewable, clean energy source produced by the microbial decomposition of organic matter, is of great significance to ecological and environmental protection. Currently, biogas is primarily used in combustion boiler systems, where the heat generated by combustion is utilized for heat exchange. As a new type of environmentally friendly equipment, biogas boilers are widely used in farms, slaughterhouses, and other places. Using biogas generated by the fermentation of organic waste as fuel, they achieve the dual benefits of energy recycling and environmental improvement.

[0003] Existing biogas combustion equipment generally has the following technical defects: First, traditional biogas boilers mostly adopt a bottom combustion chamber design, and the heat generated by combustion is transferred from bottom to top. This structure not only has low heating efficiency, but also increases the footprint of the equipment. Secondly, conventional air intake systems cannot ensure the uniform mixing of biogas and oxygen, resulting in incomplete combustion and affecting thermal efficiency. Furthermore, the combustion chamber structure is simple and lacks effective corrosion resistance measures. Corrosive components such as hydrogen sulfide contained in biogas will seriously damage the combustion chamber and shorten the service life of the equipment. Due to the complex composition of biogas, existing biogas furnaces suffer from incomplete combustion. A large amount of harmful substances in the flue gas produced by combustion adhere to the wall of the smoke pipe, resulting in a reduction in the cross-sectional area of ​​the smoke pipe and a decrease in heat exchange efficiency.

[0004] More significantly, existing equipment only shuts off the gas supply by closing the gas supply valve during shutdown, preventing the timely discharge of residual biogas within the combustion system. This residual gas can easily cause flashback in high-temperature environments, damaging the gas pipeline and posing a safety hazard. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a biogas-specific furnace that can improve biogas combustion efficiency and eliminate flashback hazards.

[0006] The present invention is implemented by the following method: a biogas-specific furnace comprising a corrosion-resistant combustion furnace, a gas supply module and a safety buffer protection member; The corrosion-resistant combustion furnace comprises a titanium alloy inner shell, a ceramic fiber heat insulation layer coated on the outer wall of the inner shell, and a stainless steel outer shell; The air supply module includes an induced draft fan, which is arranged on the left side of the stainless steel shell and is connected to the titanium alloy inner liner via a pipeline. The induced draft fan is connected to a first air inlet pipe for introducing biogas and a second air inlet pipe for introducing oxygen. A partition is provided at the left end of the titanium alloy inner liner, and the partition divides the titanium alloy inner liner into a mixing zone and a heating zone. The pipeline is connected to the mixing zone. Activated carbon adsorption plates are detachably embedded with screws at both ends of the pipeline. The mixing zone is connected to the heating zone via a first air pump. The safety buffer protection member includes a buffer chamber, which is arranged on the right side of the stainless steel shell and is connected to the titanium alloy inner liner via a first connecting pipe. The upper and lower ends of the left side of the buffer chamber are both connected to a second air pump, which is connected to the stainless steel shell via an air pumping pipe, and the buffer chamber is connected to the first air inlet pipe via a second connecting pipe. It also includes a water tank header and a hot water exchange pipe. The water tank header is used to connect different heat exchange areas and store hot water. The hot water exchange pipe is connected to the water tank header. A plurality of hot water exchange pipes are arranged at equal distances on the titanium alloy inner tank.

[0007] Furthermore, the water tank header is arranged in front of the corrosion-resistant combustion furnace, and the lower surface of the hot water exchange pipe is connected via a water inlet pipe, and the water inlet pipe is connected to the water tank header.

[0008] Furthermore, the front of the stainless steel shell is connected to a water supply pipe for supplying water to the titanium alloy inner liner, the water supply pipe is connected to the water tank header, the upper surface of the titanium alloy inner liner is connected to an exhaust pipe, a first liquid level sensor is provided at the lower end of the right side of the partition, and a second liquid level sensor is provided at the upper end of the right side of the partition.

[0009] Furthermore, an audible and visual alarm is provided at the left end of the upper surface of the stainless steel shell, an igniter is provided at the right end of the upper surface of the stainless steel shell, and an ignition end of the igniter is provided in the titanium alloy inner liner.

[0010] Furthermore, the first air intake pipe, the second air intake pipe, the water supply pipe and the second connecting pipe are all provided with a first solenoid valve.

[0011] Furthermore, an infrared temperature sensor, a flow sensor, a MEMS methane sensor and an ionization flame detector are provided at the left end of the upper surface of the titanium alloy inner liner. The controller receives signals from the flow sensor and the infrared temperature sensor and outputs instructions to the electromagnetic proportional valve and the induced draft fan; when the MEMS methane sensor detects a concentration greater than 1% LEL, the electromagnetic proportional valve is closed; when the ionization flame detector detects flameout and the temperature is greater than 200°C, the sound and light alarm is activated.

[0012] Furthermore, the titanium content of the titanium alloy liner is ≥90wt%, and the surface is treated by micro-arc oxidation to form an Al2O3 ceramic layer with a thickness of 5-10μm.

[0013] Furthermore, the titanium alloy inner liner is provided with a first maintenance and replacement port corresponding to the activated carbon adsorption plate on both the front and rear sides of the left end, the first maintenance and replacement port is connected to the first cover plate via a first bolt, and a first sealing strip is provided around the first cover plate, and the stainless steel outer shell is provided with a second maintenance and replacement port corresponding to the first maintenance and replacement port on both the front and rear sides of the left end, the second maintenance and replacement port is connected to the second cover plate via a second bolt, and a second sealing strip is provided around the second cover plate.

[0014] Furthermore, a pressure detection gauge is connected to the upper end of the right side surface of the stainless steel shell, and support frames are provided at both left and right ends of the lower surface of the stainless steel shell.

[0015] Furthermore, the right side of the buffer bin is connected to an air supply pipe, and a second solenoid valve is provided on the air supply pipe.

[0016] The beneficial effects of the present invention are as follows: the present invention improves the ability to resist hydrogen sulfide corrosion through the corrosion-resistant combustion furnace composed of a titanium alloy inner liner and a ceramic fiber insulation layer, adopts dual air inlet pipes in combination with activated carbon adsorption plates to achieve full mixing of biogas and oxygen, and utilizes a buffer bin and a vacuum pump system to eliminate residual gas during shutdown, which has the significant effects of extending the service life of the equipment, improving combustion efficiency, and ensuring operational safety; it improves the heat exchange efficiency and achieves efficient utilization of biogas energy. This solution solves the problems of corrosion, uneven mixing, safety hazards, and low heat exchange efficiency in traditional biogas combustion equipment, and provides technical support for the efficient and clean utilization of biogas resources; it achieves full mixing of biogas and oxygen through the separation structure of the mixing zone and the heating zone, utilizes activated carbon adsorption plates to filter impurities, and combines the buffer bin and the dual vacuum pump system to quickly discharge residual gas, effectively solving the problems of low combustion efficiency, severe corrosion, and flashback hazards of traditional equipment, and has the advantages of improving combustion efficiency, enhancing corrosion resistance, eliminating flashback hazards, and achieving multiple safety protections. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0019] Figure 3 Schematic diagram of the structure of the titanium alloy liner.

[0020] Figure 4 Schematic diagram of the structure of the buffer bin.

[0021] Figure 5Schematic diagram of the structure of the activated carbon adsorption plate.

[0022] Figure: Corrosion-resistant combustion furnace 1, air supply module 2, safety buffer protection 3, titanium alloy liner 11, stainless steel shell 12, induced draft fan 21, pipeline 20, first air inlet pipe 22, second air inlet pipe 23, partition 24, mixing zone 25, heating zone 26, activated carbon adsorption plate 27, first air pump 28, buffer bin 31, first connecting pipe 32, second air pump 33, air pump 34, second connecting pipe 35, water supply pipe 13, exhaust pipe 14, first liquid level sensor 4, second liquid level sensor-41, sound and light alarm-42, igniter-43, first solenoid valve-44, infrared temperature sensor-5, flow sensor-51, MEMS methane sensor-52, ionization flame detector-53, first maintenance and replacement port-6, first cover-61, first sealing strip-62, second bolt-63, second cover-64, pressure gauge-7, support frame-8, gas pipe-9, second solenoid valve-91, water tank header-10, hot water exchange pipe-101, water inlet pipe-102. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] See also Figures 1 to 5 As shown, the present invention provides an embodiment: a biogas-specific furnace, comprising a corrosion-resistant combustion furnace 1, a gas supply module 2 and a safety buffer protection member 3; The corrosion-resistant combustion furnace 1 comprises a titanium alloy inner shell 11, a ceramic fiber heat insulation layer covering the outer wall of the inner shell, and a stainless steel outer shell 12; The air supply module 2 includes an induced draft fan 21, which is arranged on the left side of the stainless steel shell 12 and is connected to the titanium alloy inner liner 11 via a pipe 20. The induced draft fan 21 is connected to a first air inlet pipe 22 for introducing biogas and a second air inlet pipe 23 for introducing oxygen. A partition 24 is provided at the left end of the titanium alloy inner liner 11. The partition 24 divides the titanium alloy inner liner 11 into a mixing zone 25 and a heating zone 26. The pipe 20 is connected to the mixing zone 25. Activated carbon adsorption plates 27 are detachably embedded with screws at both ends of the pipe 20. The mixing zone 25 is connected to the heating zone 26 via a first air pump 28. The safety buffer protection part 3 includes a buffer bin 31, which is arranged on the right side of the stainless steel shell 12. The buffer bin 31 is connected to the titanium alloy inner liner 11 via a first connecting pipe 32. The upper and lower ends of the left side of the buffer bin 31 are connected to a second air pump 33. The second air pump 33 is connected to the stainless steel shell 12 via an air extraction pipe 34. The buffer bin 31 is connected to the first air inlet pipe 22 via a second connecting pipe 35.

[0025] It also includes a water tank header 10 and a hot water exchange pipe 101. The water tank header 10 is used to connect different heat exchange areas and store hot water. The hot water exchange pipe 101 is connected to the water tank header 10. A plurality of hot water exchange pipes 101 are arranged at equal distances on the titanium alloy inner tank 11.

[0026] Among them, the corrosion-resistant combustion furnace 1 refers to a combustion furnace structure composed of a titanium alloy inner liner, a ceramic fiber insulation layer and a stainless steel outer shell. Specifically, the inner liner can be cast with a titanium alloy material and a ceramic fiber layer can be coated on the outer wall to achieve insulation. The outer layer is covered with a stainless steel shell to achieve structural protection, which is used to resist the erosion of the furnace body by corrosive components such as hydrogen sulfide generated by the combustion of biogas.

[0027] Among them, the air supply module 2 refers to an air supply system including an induced draft fan, a first air inlet pipe, a second air inlet pipe, a partition and an activated carbon adsorption plate. Specifically, an induced draft fan can be used to connect the biogas and oxygen air inlet pipes, and the mixing zone and the heating zone can be separated by a partition. An activated carbon adsorption plate is embedded in the pipeline to filter impurities, so as to improve the mixing uniformity and combustion completeness of biogas and oxygen.

[0028] Among them, the safety buffer protection part 3 refers to a safety device including a buffer bin, a second vacuum pump and a connecting pipe. Specifically, the buffer bin can be connected to the combustion furnace and the air intake pipe through the vacuum pump to exhaust residual biogas during shutdown and prevent the risk of backfire.

[0029] Among them, the water tank header 10 refers to a water tank structure used to store and distribute hot water. Specifically, a metal box can be used to connect multiple hot water pipes, which are connected to the water pipes in the combustion furnace through the water inlet pipe to increase the heat exchange area and thermal energy utilization efficiency.

[0030] The core innovation of this application lies in the integrated design of the corrosion-resistant combustion furnace, gas supply module, safety buffer protection parts and water tank header, which realizes the integrated functions of corrosion protection, gas mixing optimization, safe discharge of residual gas and efficient heat exchange inside the combustion furnace, thereby solving the problems of severe corrosion, incomplete combustion and prominent safety hazards of traditional equipment.

[0031] The working process and principle of this application are as follows: the corrosion-resistant combustion furnace comprises a titanium alloy inner liner, a ceramic fiber insulation layer, and a stainless steel outer shell. The titanium alloy inner liner has excellent corrosion resistance and can effectively resist the corrosive components in biogas. The ceramic fiber insulation layer is coated on the outer wall of the inner liner to provide thermal insulation and protection. The stainless steel outer shell provides mechanical strength and external protection.

[0032] The air supply module uses an induced draft fan to deliver biogas and oxygen to the titanium alloy inner liner. The induced draft fan is located on the left side of the stainless steel housing and connected to the titanium alloy inner liner via a pipe. The first and second air inlet pipes are used to deliver biogas and oxygen, respectively. A partition is installed at the left end of the titanium alloy inner liner, dividing it into a mixing zone and a heating zone. A pipe connects to the mixing zone to deliver the gas mixture. Activated carbon adsorption plates are installed at the top and bottom of the pipe to remove impurities from the gas. The mixing zone is connected to the heating zone via a first air extraction pump to ensure thorough mixing and delivery of the gas.

[0033] The safety buffer protection component includes a buffer chamber, located on the right side of the stainless steel housing. This chamber is connected to the titanium alloy inner liner via a first connecting pipe and is used to buffer and store excess gas. Secondary air pumps are located at the upper and lower ends of the left side of the buffer chamber and connected to the stainless steel housing via air extraction pipes to extract excess gas. The buffer chamber is also connected to the first air inlet pipe via a second connecting pipe, forming a gas circulation system.

[0034] The water tank header and hot water pipes form the heat exchange system. The water tank header connects different heat exchange areas and stores hot water. Multiple hot water pipes are equidistantly spaced on the titanium alloy inner tank and connected to the water tank header for efficient heat exchange.

[0035] This design enhances the corrosion resistance of the combustion furnace through multiple protective measures. Zoned mixing and multi-stage filtration ensure thorough mixing and purity of the gas. A buffer tank and exhaust system effectively prevent safety hazards caused by residual gas. Distributed heat exchange pipes improve heat exchange efficiency. These components work together to achieve efficient and safe biogas combustion and thermal energy utilization.

[0036] As a preferred embodiment, the solution of this application is specifically implemented as follows: The corrosion-resistant combustion furnace is cylindrical in structure, with a titanium alloy liner inside and a stainless steel shell outside, and the middle is filled with ceramic fiber insulation material. A partition is installed at the left end of the titanium alloy liner, dividing the internal space into a mixing zone and a heating zone.

[0037] In the air supply module, the induced draft fan (IDF) is mounted on the left side of the stainless steel housing and connected to the pipe via a flange. The other end of the pipe connects to the mixing zone within the titanium alloy liner. The first and second air inlet pipes are connected to the IDF inlet, respectively, to transport biogas and oxygen. Removable activated carbon adsorption plates are installed at the top and bottom of the pipes and secured with screws. A first air extraction pump is installed in the mixing zone and connected to the heating zone.

[0038] The safety buffer protector comprises a spherical buffer chamber mounted on the right side of the stainless steel housing. The buffer chamber is connected to the titanium alloy inner liner via a first connecting pipe. A second air pump is mounted on each of the upper and lower ends of the left side of the buffer chamber, connected to the stainless steel housing via an air pump pipe. The buffer chamber is also connected to the first air inlet pipe via a second connecting pipe.

[0039] The water tank header is a cubic container installed below the burner. Multiple U-shaped water exchange pipes are installed at equal distances on the upper part of the titanium alloy inner tank, and both ends are connected to the water tank header.

[0040] During operation, biogas and oxygen are mixed by the induced draft fan and then flow into the mixing zone. After being filtered through the activated carbon adsorption plate, they are transported by the first exhaust pump to the heating zone for combustion. The heat generated by combustion is transferred to the water in the water tank header via the heat exchange pipe. Excess gas is temporarily stored in the buffer bin and can be extracted by the second exhaust pump or re-entered into the system for recycling.

[0041] Through the above scheme, this application improves the corrosion resistance of the biogas combustion furnace and extends the service life of the equipment. The use of zoned mixing and multi-stage filtration ensures the full mixing and purity of biogas and oxygen, thereby improving combustion efficiency. The provision of a buffer bin and an exhaust system effectively prevents safety hazards caused by residual gas and enhances the safety of equipment operation. The distributed layout of the heat exchange water pipes improves the heat exchange efficiency and realizes the efficient use of biogas energy. This solution solves the problems of corrosion, uneven mixing, safety hazards and low heat exchange efficiency existing in traditional biogas combustion equipment, and provides technical support for the efficient and clean use of biogas resources.

[0042] Please continue reading Figure 1 and Figure 3 As shown, in one embodiment of the present invention, the water tank header 10 is arranged in front of the corrosion-resistant combustion furnace 1, and the lower surface of the hot water exchange pipe 101 is connected via a water inlet pipe 102, and the water inlet pipe 102 is connected to the water tank header 10.

[0043] The water tank header is located in front of the corrosion-resistant combustion furnace, optimizing its spatial position to shorten the heat transfer path. The lower surface of the heat exchange pipe is vertically connected to the water tank header via an inlet pipe secured with a flange or clamp. The pipe has an inner diameter of 25-40mm and a water flow rate of 0.5-1.2m / s. A deflector is installed inside the water tank header, aligned with the inlet pipe entrance. The deflector is tilted at a 30-45° angle and features a flow groove.

[0044] Specifically, the water tank header is positioned in front of the burner, creating a linear heat exchange path between the heat exchange pipes and the heat exchange area of ​​the burner's inner tank. The lower surface of the heat exchange pipes is connected to the bottom of the water tank header via inlet pipes, where water is evenly distributed to each heat exchange pipe via guide plates. The inclination of the guide plates, combined with the guide grooves, reduces turbulence caused by water impact, ensuring smooth water flow into the heat exchange pipes. The inner diameter of the inlet pipe is matched to the water flow velocity to avoid pipe vibration caused by excessively high flow rates or deposits caused by excessively low flow rates. This layout achieves efficient circulation of the heat exchange medium and uniform heat transfer by optimizing the spatial location and connection structure.

[0045] As a preferred embodiment, the solution of the present application is specifically implemented as follows: the water tank header is arranged in front of the corrosion-resistant combustion furnace, and the lower surface of the hot water exchange pipe is connected via a water inlet pipe, and the water inlet pipe is connected to the water tank header. The water tank header is made of stainless steel and has a volume of 200L. The water inlet pipe adopts a stainless steel pipe with a diameter of 25mm, which is connected to the water tank header and the hot water exchange pipe through a flange connection. The hot water exchange pipe adopts a stainless steel coil with a diameter of 20mm, which is evenly distributed in a spiral shape on the titanium alloy inner tank, with a total length of 15m. The water tank header is provided with a water inlet, a water outlet and an overflow port. The water inlet is connected to the tap water pipe, the water outlet is connected to the hot water pipe at the user end, and the overflow port is used to discharge excess water.

[0046] Through the above-mentioned technical solution, this application achieves centralized storage and distribution of hot water. The water tank header, serving as a hot water storage device, collects hot water from different heat exchange areas, ensuring a stable hot water supply. The water inlet pipe connects the hot water exchange pipes to the water tank header, forming a closed-loop circulation system and improving thermal energy utilization efficiency. Furthermore, the location of the water tank header facilitates operation and maintenance, facilitating the safe operation and daily management of the entire system.

[0047] Please continue reading Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the front of the stainless steel shell 12 is connected to a water supply pipe 13 for supplying water to the titanium alloy inner liner 11, and the water supply pipe 13 is connected to the water tank header 10, and the upper surface of the titanium alloy inner liner 11 is connected to an exhaust pipe 14, and the lower end of the right side of the partition 24 is provided with a first liquid level sensor 4, and the upper end of the right side of the partition 24 is provided with a second liquid level sensor 41.

[0048] The water supply pipe 13 connects to the titanium alloy inner tank through the front of the stainless steel shell. The water tank header delivers cooling water to the inner tank through the water supply pipe. The exhaust pipe 14 is located at the top of the inner tank to discharge steam generated inside. The first liquid level sensor 4 is located at the lower right end of the partition, and the second liquid level sensor 41 is located at the upper right end of the partition. They respectively detect the minimum and maximum thresholds of the water level in the inner tank. For example, the first liquid level sensor triggers a low water level signal, while the second liquid level sensor triggers a high water level signal. The water supply pipe and the water tank header are connected using flanges or threaded interfaces to ensure a tight seal. A condensation recovery device can be installed at the end of the exhaust pipe to reduce direct water vapor discharge.

[0049] Specifically, the water tank header continuously supplies water to the titanium alloy inner tank through the water supply pipe. The first liquid level sensor monitors the lower limit of the water level in the inner tank in real time. When the water level is lower than the set value, the controller starts the water replenishment process and increases the water volume through the water supply pipe. The second liquid level sensor monitors the upper limit of the water level to prevent excessive water injection from causing abnormal pressure in the inner tank. The exhaust pipe discharges the high-temperature steam in the inner tank to avoid pressure accumulation. At the same time, the steam can be reused as heat through an external recovery system. The signal of the liquid level sensor is transmitted to the controller, and the controller dynamically adjusts the opening of the first solenoid valve on the water supply pipe according to the water level status to achieve automatic water replenishment and water level balance. This solution ensures that the water level in the inner tank is stable within a safe range through the coordinated control of dual liquid level sensors. The exhaust pipe further releases pressure to improve the reliability of equipment operation.

[0050] As a preferred embodiment, the solution of this application is specifically implemented as follows: The front of the stainless steel shell is connected to a water supply pipe that supplies water to the titanium alloy inner tank. The water supply pipe is connected to the water tank header. The top surface of the titanium alloy inner tank is connected to the exhaust pipe. A first liquid level sensor is located at the lower end of the right side of the partition. A second liquid level sensor is located at the upper end of the right side of the partition.

[0051] The water supply pipe is made of 304 stainless steel, with an inner diameter of 20mm and a wall thickness of 2mm. One end of the water supply pipe is connected to the water outlet of the water tank header, and the other end passes through the stainless steel outer shell and connects to the titanium alloy inner tank. The exhaust pipe is made of 316L stainless steel, with an inner diameter of 25mm and a wall thickness of 2.5mm. One end is connected to the top of the titanium alloy inner tank and the other end extends to the outside of the equipment. The first and second liquid level sensors are both magnetic float type liquid level sensors and are installed on the right side of the partition, 50mm below and 50mm above the partition, respectively.

[0052] Through the above technical solution, this application achieves precise control and monitoring of the water level in the titanium alloy inner tank. The provision of a water supply pipe and a steam exhaust pipe ensures the stability of the water circulation in the inner tank. The configuration of two liquid level sensors accurately detects changes in the inner tank water level, preventing equipment damage or reduced operating efficiency caused by excessively high or low water levels. This improves the operational safety and efficiency of the biogas boiler and extends the equipment's service life.

[0053] Please continue reading Figure 1 and Figure 2 As shown, in one embodiment of the present invention, an audible and visual alarm 42 is provided at the left end of the upper surface of the stainless steel shell 12 , and an igniter 43 is provided at the right end of the upper surface of the stainless steel shell 12 , and the ignition end of the igniter 43 is provided in the titanium alloy inner liner 11 .

[0054] Among them, the sound and light alarm 42 is fixed to the left end area of ​​the upper surface of the shell by screws, and its signal input end is electrically connected to the ionization flame detector; the igniter 43 is made of high-temperature resistant alloy, and its ignition electrode extends to 10-15 cm above the mixing area of ​​the titanium alloy inner liner, and the igniter 43 control circuit is integrated inside the shell; the sound and light alarm 42 and the igniter are respectively arranged on both sides of the longitudinal axis of the shell, and the distance between the two is 40%-45% of the total length of the shell.

[0055] Specifically, when the ionization flame detector detects a flameout state and the temperature exceeds 200°C, the sound and light alarm immediately triggers a high-frequency buzzer and red flash warning, and the operator can quickly locate the alarm source through the left side of the casing. The igniter electrode penetrates into the top space of the mixing zone and generates an arc ignition within 0.5-1 second after the induced draft fan is started. The arc length is controlled at 3-5mm to ensure that the biogas and oxygen mixture is reliably ignited during the rising process. The sound and light alarm and the igniter are arranged separately to avoid electromagnetic interference. The arrangement on the right side of the igniter shortens the length of the ignition line, reduces the line impedance loss, and stabilizes the ignition voltage within the range of 12kV±5%. The top plane of the casing is a horizontal reference plane, and the height difference between the sound and light alarm installation plane and the igniter installation plane is less than 2mm to ensure the overall structural stability of the equipment.

[0056] As a preferred embodiment, the solution of the present application is specifically implemented as follows: an audible and visual alarm is provided at the left end of the upper surface of the stainless steel shell, an igniter is provided at the right end of the upper surface of the stainless steel shell, and the ignition end of the igniter is provided in the titanium alloy inner liner. The audible and visual alarm is composed of a combination of an LED lamp and a buzzer, and can emit an audible and visual alarm signal. The igniter adopts an electronic ignition device, including a high-voltage generator and an ignition electrode. The high-voltage generator is mounted on the upper surface of the stainless steel shell, and the ignition electrode extends into the interior of the titanium alloy inner liner. The ignition electrode is made of a high-temperature resistant alloy material, has a length of 200 mm, and a diameter of 3 mm.

[0057] Through the above technical solution, this application implements automatic ignition and safety alarm functions for a biogas-based furnace. The sound and light alarm promptly sounds an alarm in abnormal situations, prompting the operator to take appropriate action. The igniter automatically ignites biogas without manual operation, improving user convenience and safety. The ignition electrode extends into the titanium alloy inner liner, enabling direct ignition in the combustion area, ensuring reliable ignition. The integration of these functions enhances the automation and safety performance of the biogas-based furnace.

[0058] Please continue reading Figure 1 and Figure 2 As shown, in one embodiment of the present invention, a first solenoid valve 44 is provided on each of the first air intake pipe 22 , the second air intake pipe 23 , the water supply pipe 13 and the second connecting pipe 35 .

[0059] The first solenoid valve 44 adopts a direct-acting structure, with a valve body made of 304 stainless steel and a pressure rating of no less than 1.6 MPa. The solenoid valve coil operates at a DC24V voltage and has a response time of less than 0.5 seconds. The solenoid valves in each pipeline are connected to the controller via independent control circuits. The solenoid valves in the first and second air intake pipes open and close synchronously, the solenoid valve in the water supply pipe is independently controlled based on the liquid level sensor signal, and the solenoid valve in the second connecting pipe is linked to the buffer tank pressure gauge. The solenoid valve sealing surface is made of fluororubber, which is resistant to corrosion caused by the hydrogen sulfide component in biogas.

[0060] Specifically, when the combustion furnace is started, the controller simultaneously opens the solenoid valves of the first air inlet pipe and the second air inlet pipe, and the biogas and oxygen enter the mixing zone in proportion. The solenoid valve of the water supply pipe automatically replenishes water according to the signal of the first liquid level sensor to maintain the water level in the heating zone within the set range. In the event of an emergency shutdown or when the methane concentration exceeds the standard, all solenoid valves are cut off synchronously to block the flow of the medium. The solenoid valve of the second connecting pipe dynamically adjusts the opening according to the buffer bin pressure data. When the pressure detection gauge displays a value exceeding 0.8MPa, the solenoid valve gradually opens to relieve pressure. The independent control of each solenoid valve enables the gas supply, water supply and pressure balance operations to form a closed-loop system, avoiding equipment damage caused by residual medium or abnormal pressure, while ensuring that the combustion process parameters are precisely controllable.

[0061] As a preferred embodiment, the solution of the present application is specifically implemented as follows: a first solenoid valve is provided on the first air inlet pipe, the second air inlet pipe, the water supply pipe and the second connecting pipe. The first solenoid valve is installed on the pipeline and is used to control the flow of gas or liquid. Specifically, the first solenoid valve includes a valve body, a solenoid coil and a valve core. The valve body is made of stainless steel and has a flow channel inside. The solenoid coil is wound around the outside of the valve body and generates a magnetic field when energized. The valve core is located inside the valve body and is connected to the solenoid coil. When the solenoid coil is energized, the valve core is attracted and moved to open or close the flow channel. The switch of the first solenoid valve is controlled by a controller, which can achieve precise regulation of the gas and liquid flow.

[0062] Through the above technical solution, the present application achieves precise control of air intake and water supply. The provision of the first solenoid valve allows the supply of biogas, oxygen, and water to be turned on or off at any time as needed, avoiding waste of gas or liquid. At the same time, the rapid response characteristics of the solenoid valve can quickly cut off the gas or liquid supply in an emergency, improving the safety of the system. In addition, by coordinating the control of multiple solenoid valves through the controller, the ratio of biogas, oxygen, and water can be adjusted to optimize combustion efficiency.

[0063] Please continue reading Figure 2 As shown, in one embodiment of the present invention, an infrared temperature sensor 5, a flow sensor 51, a MEMS methane sensor 52 and an ionization flame detector 53 are provided at the left end of the inner upper surface of the titanium alloy liner 11. The controller receives signals from the flow sensor 51 and the infrared temperature sensor 5 and outputs instructions to the electromagnetic proportional valve and the induced draft fan 21; when the MEMS methane sensor 52 detects a concentration greater than 1% LEL, the electromagnetic proportional valve is closed; when the ionization flame detector 53 detects flameout and the temperature is greater than 200°C, the sound and light alarm is activated.

[0064] The infrared temperature sensor 5 monitors the combustion zone's temperature in real time, the flow sensor 51 detects the biogas supply rate, the MEMS methane sensor 52 measures the concentration of unburned biogas, and the ionization flame detector 53 determines whether the flame has been extinguished. The controller receives signals from multiple sources and dynamically adjusts the opening of the solenoid proportional valve and the speed of the induced draft fan to ensure combustion efficiency and safety. If the methane concentration exceeds 1% of the lower explosive limit, the solenoid proportional valve immediately closes, blocking the biogas supply. If the flame unexpectedly extinguishes but the temperature remains above 200°C, an audible and visual alarm activates, prompting operator intervention.

[0065] Specifically, the signals from the infrared temperature sensor and flow sensor are input into the controller, which calculates the combustion efficiency and heat load through a preset algorithm. The controller then adjusts the opening of the solenoid proportional valve to control the biogas flow rate, while also adjusting the speed of the induced draft fan to optimize the oxygen mixing ratio. The MEMS methane sensor continuously monitors the residual biogas concentration in the liner. If the concentration exceeds a safety threshold, the controller shuts off the solenoid proportional valve to prevent the accumulation of unburned biogas from causing a deflagration. The ionization flame detector, linked to the temperature sensor, triggers an alarm when the flame is extinguished but the residual temperature is high, preventing the spontaneous combustion of residual biogas in high-temperature environments. For example, the methane concentration threshold is set at 1%LEL, which covers the lower explosion limit of most biogas components; the temperature threshold of 200°C is set based on the temperature resistance limit of the pipeline material to ensure that operators have sufficient time to handle the alarm after it is triggered.

[0066] As a preferred embodiment, the solution of this application is specifically implemented as follows: An infrared temperature sensor, a flow sensor, a MEMS methane sensor, and an ionization flame detector are installed on the left end of the inner upper surface of the titanium alloy liner. A controller receives signals from the flow sensor and infrared temperature sensor and outputs instructions to the solenoid proportional valve and induced draft fan. When the MEMS methane sensor detects a concentration greater than 1% LEL, the solenoid proportional valve is closed. When the ionization flame detector detects flameout and the temperature is greater than 200°C, an audible and visual alarm is activated.

[0067] Specifically, infrared temperature sensors are used to monitor combustion temperature in real time, while flow sensors monitor the flow rates of biogas and oxygen. MEMS methane sensors, utilizing microelectromechanical systems (MEMS) technology, are compact and highly sensitive, and are used to detect methane concentrations. Ionization flame detectors determine combustion status by detecting ions produced by the flame. A controller adjusts the solenoid proportional valve and induced draft fan based on sensor signals, achieving precise control of the combustion process. If methane concentrations become excessive, the controller immediately closes the solenoid proportional valve, cutting off the gas supply. If an unexpected flameout is detected and the temperature remains high, the controller activates an audible and visual alarm to alert the operator.

[0068] Through the above technical solution, this application achieves real-time monitoring and precise control of the biogas combustion process. By using a variety of sensors, abnormalities can be detected promptly and appropriate measures can be taken, effectively improving the safety and stability of biogas combustion. At the same time, automated control reduces the need for manual operation, improving the reliability and ease of use of the system. Furthermore, precise control of the combustion process helps improve combustion efficiency and reduce energy waste.

[0069] Please continue reading Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the titanium content of the titanium alloy liner 11 is ≥90wt%, and the surface is treated by micro-arc oxidation to form an Al2O3 ceramic layer with a thickness of 5-10μm.

[0070] Among them, the titanium content ≥90wt% ensures that the substrate has the corrosion resistance of high-purity titanium and reduces the impact of impurity elements on high-temperature oxidation resistance; micro-arc oxidation treatment generates an Al2O3 ceramic layer in situ on the surface of the titanium alloy through high-voltage discharge in the electrolyte. This ceramic layer forms a metallurgical bond with the substrate and has high hardness and chemical inertness; the 5-10μm thickness range ensures protective performance while avoiding a decrease in the thermal conductivity efficiency of the inner tank or brittle cracking of the ceramic layer due to excessive thickness.

[0071] Specifically, the titanium alloy liner uses a high-purity titanium substrate. By controlling the proportion of titanium in the alloy composition to be no less than 90wt%, the possibility of impurities such as iron and carbon reacting with corrosive media at high temperatures to form oxides is reduced, thereby maintaining the structural stability of the substrate. During the surface micro-arc oxidation process, the titanium alloy acts as an anode to produce a plasma discharge reaction in the electrolyte. The titanium element combines with the oxygen ions in the electrolyte to form an Al2O3 ceramic layer. This layer evenly covers the surface of the liner, blocking direct contact between the methane combustion products and the substrate. The thickness of the ceramic layer is controlled within the range of 5-10μm, which can effectively isolate the penetration of the corrosive medium and avoid being too thick, which will cause internal stress to be generated due to the difference in thermal expansion coefficients between the ceramic and the titanium alloy when the liner is heated, thereby preventing the ceramic layer from peeling off or the substrate from deforming.

[0072] As a preferred embodiment, the solution of this application is specifically implemented as follows: The titanium content of the titanium alloy liner is 95wt%, and the surface is treated with micro-arc oxidation to form a 7μm thick Al2O3 ceramic layer. Specifically, the titanium alloy liner is made of Ti-6Al-4V alloy material, and the Al2O3 ceramic layer is formed on its surface through a micro-arc oxidation process. During the micro-arc oxidation process, the electrolyte is a mixed solution of sulfuric acid and phosphoric acid, the voltage is 400V, the current density is 20A / dm², and the treatment time is 30 minutes. The Al2O3 ceramic layer thus formed has high hardness, wear resistance and corrosion resistance, further improving the service life and performance of the titanium alloy liner.

[0073] Through the above technical solution, the present application improves the corrosion resistance and service life of the titanium alloy inner liner. The Al2O3 ceramic layer formed on the surface of the titanium alloy inner liner can effectively block the corrosive components in the biogas from directly contacting the titanium alloy matrix, thereby slowing down the corrosion rate of the titanium alloy inner liner. At the same time, the Al2O3 ceramic layer has high hardness and wear resistance, which can reduce the wear on the surface of the inner liner during biogas combustion. In addition, the Al2O3 ceramic layer also has good thermal stability and can maintain stable performance in high temperature environments. As a result, the service life of the titanium alloy inner liner is extended, the frequency of maintenance and replacement is reduced, and the operating cost of the biogas furnace is reduced.

[0074] Please continue reading Figure 1 and Figure 3As shown, in one embodiment of the present invention, a first maintenance and replacement port 6 corresponding to the activated carbon adsorption plate 27 is opened on both the front and rear sides of the left end of the titanium alloy inner liner 11, and the first maintenance and replacement port 6 is connected to the first cover plate 61 via a first bolt, and a first sealing strip 62 is provided around the first cover plate 61. A second maintenance and replacement port (not shown) corresponding to the first maintenance and replacement port 6 is opened on both the front and rear sides of the left end of the stainless steel outer shell 12, and the second maintenance and replacement port is connected to the second cover plate 64 via a second bolt 63, and a second sealing strip (not shown) is provided around the second cover plate 64.

[0075] Among them, the positions of the first maintenance and replacement port 6 and the second maintenance and replacement port strictly correspond to each other, ensuring that the maintenance channel passes through the titanium alloy inner liner and the stainless steel outer shell; the first bolt and the second bolt adopt a countersunk design to avoid the protruding structure interfering with external equipment; the first sealing strip and the second sealing strip are made of high-temperature resistant silicone material with a temperature resistance range of -50°C to 300°C; the thickness of the first cover plate and the second cover plate are matched with the wall thickness of the titanium alloy inner liner and the stainless steel outer shell respectively to avoid a reduction in structural strength.

[0076] Specifically, when the activated carbon adsorption plate needs to be replaced, loosen the second bolt and remove the second cover, exposing the first maintenance and replacement port. Then loosen the first bolt and remove the first cover. The activated carbon adsorption plate can now be directly removed from the left side of the titanium alloy liner for replacement. During installation, the first sealing strip is compressed to fill the gap between the cover and the titanium alloy liner, while the second sealing strip simultaneously seals the gap between the stainless steel shell and the cover. This double seal prevents external air infiltration and internal gas leakage. The bolted connection method ensures easy disassembly and assembly while maintaining the structural tightness and preventing the cover from shifting due to vibration.

[0077] As a preferred embodiment, the solution of this application is specifically implemented as follows: A first maintenance and replacement port corresponding to the activated carbon adsorption plate is provided on the front and rear sides of the left end of the titanium alloy inner liner. The first maintenance and replacement port is connected to the first cover plate via a first bolt. A first sealing strip is provided around the first cover plate. A second maintenance and replacement port corresponding to the first maintenance and replacement port is provided on the front and rear sides of the left end of the stainless steel outer shell. The second maintenance and replacement port is connected to the second cover plate via a second bolt. A second sealing strip is provided around the second cover plate.

[0078] Specifically, the first maintenance and replacement port and the second maintenance and replacement port are respectively arranged on the front and rear sides of the left end of the titanium alloy inner liner and the stainless steel outer shell. The size of the first maintenance and replacement port matches the activated carbon adsorption plate, which is convenient for the removal and replacement of the activated carbon adsorption plate. The first cover plate is fixed by a plurality of first bolts evenly distributed around the first maintenance and replacement port. The first sealing strip is made of high-temperature resistant rubber material and is arranged around the first cover plate to ensure the sealing effect. The position and size of the second maintenance and replacement port correspond to the first maintenance and replacement port. The second cover plate is also fixed to the second maintenance and replacement port by a plurality of second bolts. The second sealing strip is made of anti-corrosion rubber material and is arranged around the second cover plate to further enhance the overall sealing.

[0079] Through the above technical solution, this application achieves convenient replacement and maintenance of activated carbon adsorption plates. This extends the service life of the activated carbon adsorption plates and improves biogas purification efficiency. Furthermore, the double-layer sealing design enhances overall sealing, prevents biogas leakage, and improves equipment safety. At the same time, convenient maintenance methods reduce downtime and improve equipment operating efficiency. Furthermore, the modular design facilitates standardized production and maintenance, reducing production and maintenance costs.

[0080] Please continue reading Figure 1 and Figure 2 As shown, in one embodiment of the present invention, a pressure detection gauge 7 is connected to the upper end of the right side surface of the stainless steel shell 12, and support frames 8 are provided at both left and right ends of the lower surface of the stainless steel shell 12.

[0081] The pressure gauge 7 is threadedly fixed to the top flat surface of the right side of the stainless steel housing, with the dial axis perpendicular to the horizontal plane. The support frame 8 is an inverted L-shaped metal structure, its vertical section welded to the bottom of the stainless steel housing in a symmetrical position. The horizontal section extends parallel to the housing bottom, and a base plate with mounting holes is welded to the bottom. The pressure gauge's pressure conduit passes through the housing wall and connects to the titanium alloy inner cavity, using a copper sealing gasket to achieve an airtight connection. The mounting holes on the support frame base plate are spaced 200mm apart and have a diameter of 12mm. They are fixed to the ground with expansion bolts.

[0082] Specifically, the pressure gauge collects real-time data on the internal gas pressure of the titanium alloy liner. When the pressure exceeds the threshold of 0.8MPa during biogas combustion, the operator can cut off the gas supply in time to avoid the risk of pressure vessel bursting. The support frame is symmetrically distributed on both sides of the bottom of the equipment, and effectively disperses the weight of the equipment through four-point contact support. When the induced draft fan generates vibration during operation, the horizontal section of the support frame generates a reverse torque to suppress the amplitude, and the vertical section rigidly supports to prevent the equipment from tilting. The pressure gauge is installed on the right side of the top of the casing and is in the same axial plane as the buffer bin, making it convenient for the operator to stand and observe the dial data. The mounting holes of the support frame base plate are fixed with countersunk bolts to maintain a 20mm gap between the bottom surface of the equipment and the ground, which not only ensures stability but also facilitates heat dissipation in the bottom space.

[0083] As a preferred embodiment, the solution of the present application is specifically implemented as follows: the pressure detection gauge is installed at the upper end of the right side of the stainless steel housing by means of a threaded connection. The detection end of the pressure detection gauge penetrates the housing and extends into the internal cavity. The detection end and the internal cavity are airtightly connected by a sealing rubber ring. The support frame adopts an inverted U-shaped structure. The two support frames are symmetrically welded to the left and right edges of the lower surface of the stainless steel housing. The bottom horizontal section of the support frame extends outward from the outside of the vertical section to form an anti-slip support surface. The surface of the anti-slip support surface is bonded with a rubber anti-slip pad. The vertical section of the support frame and the housing are fastened together by four sets of rectangularly distributed bolts.

[0084] Through the above technical solution, this application realizes real-time visual monitoring of the internal pressure during the operation of the combustion furnace, effectively preventing the risk of sealing failure or explosion caused by abnormal pressure increase. At the same time, the overall stability of the equipment is improved through the double-sided support structure, avoiding equipment tilting or loosening of connecting pipes due to vibration or external force impact, and further ensuring the safe operation life of the combustion furnace under complex working conditions.

[0085] Please continue reading Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the right side of the buffer bin 31 is connected to an air supply pipe 9 , and a second solenoid valve 91 is provided on the air supply pipe 9 .

[0086] The gas pipeline 9 transports biogas under the control of the second solenoid valve 91 . However, when the second solenoid valve 91 fails or the pipeline pressure increases abnormally, there is a safety hazard of overpressure causing pipeline rupture or biogas leakage.

[0087] The present application further proposes that a safety pressure relief valve be provided on the gas transmission pipe, and the opening pressure of the safety pressure relief valve is 0.5-0.8 MPa.

[0088] The safety relief valve is pressure-activated through a mechanical structure or spring preload, and the opening pressure range is set by adjusting the spring stiffness or valve core weight. The safety relief valve connects to the gas pipeline via a flange or threaded connection, and the valve body is made of corrosion-resistant stainless steel or titanium alloy. The pressure relief valve's outlet can be connected to an external discharge pipe to direct overpressure biogas to a safe area.

[0089] Specifically, when the pressure in the gas pipeline exceeds 0.5-0.8MPa, the valve core of the safety pressure relief valve overcomes the spring resistance or deadweight under the action of pressure, automatically opens the pressure relief channel, and releases excess biogas. After the pressure is released, when the pressure drops below the set value, the valve core resets and closes. As a mechanical protection device independent of the second solenoid valve, the safety pressure relief valve can still respond to overpressure risks when the solenoid valve fails or the controller fails, thereby avoiding excessive pressure in the pipeline. The pressure threshold range is determined based on the strength of the pipeline material and the working pressure of the burner. For example, the lower limit of 0.5MPa prevents false triggering, and the upper limit of 0.8MPa ensures that the pressure is released earlier than the pipeline's pressure limit.

[0090] As a preferred embodiment, the solution of the present application is specifically implemented as follows: a gas pipe is set on the right side of the buffer bin, the pipe mouth of the gas pipe is sealed and connected to the exhaust port of the buffer bin through a flange, and the end of the gas pipe extends to the external biogas recovery device. A second solenoid valve is installed in the middle of the pipe body of the gas pipe. The valve body of the second solenoid valve adopts an explosion-proof electromagnetic actuator, and its coil drive part is electrically connected to the controller. When the burner is closed, the controller sends an opening signal to the second solenoid valve, and the valve core moves axially under the action of electromagnetic force, so that the gas pipe is conductive, and the residual biogas in the buffer bin is discharged to the recovery device through the gas pipe; when the burner is started, the controller sends a closing signal, and the valve core resets to block the pipeline.

[0091] Through the above-mentioned technical solution, this application effectively solves the problem of residual biogas remaining after the combustion furnace is shut down, causing pipeline flashback damage. Active control of the solenoid valve enables the targeted discharge of residual biogas, preventing biogas accumulation in the pipeline and causing safety hazards. The discharged biogas is also recycled to reduce energy waste. This solution enables pipeline opening and closing through precise electrical control, enhancing safety protection capabilities during equipment shutdown.

[0092] The igniter, solenoid valve, induced draft fan, controller, infrared temperature sensor, flow sensor, MEMS methane sensor and ionization flame detector in the present invention are all prior arts, which are clearly understood by those skilled in the art and will not be described in detail here.

[0093] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A biogas-specific furnace, characterized by: Including corrosion-resistant combustion furnace, gas supply module and safety buffer protection parts; The corrosion-resistant combustion furnace comprises a titanium alloy inner shell, a ceramic fiber heat insulation layer coated on the outer wall of the inner shell, and a stainless steel outer shell; The air supply module includes an induced draft fan, which is arranged on the left side of the stainless steel shell and is connected to the titanium alloy inner liner via a pipeline. The induced draft fan is connected to a first air inlet pipe for introducing biogas and a second air inlet pipe for introducing oxygen. A partition is provided at the left end of the titanium alloy inner liner, and the partition divides the titanium alloy inner liner into a mixing zone and a heating zone. The pipeline is connected to the mixing zone. Activated carbon adsorption plates are detachably embedded with screws at both ends of the pipeline. The mixing zone is connected to the heating zone via a first air pump. The safety buffer protection member includes a buffer chamber, which is arranged on the right side of the stainless steel shell and is connected to the titanium alloy inner liner via a first connecting pipe. The upper and lower ends of the left side of the buffer chamber are both connected to a second air pump, which is connected to the stainless steel shell via an air pumping pipe, and the buffer chamber is connected to the first air inlet pipe via a second connecting pipe. It also includes a water tank header and a hot water exchange pipe. The water tank header is used to connect different heat exchange areas and store hot water. The hot water exchange pipe is connected to the water tank header. A plurality of hot water exchange pipes are arranged at equal distances on the titanium alloy inner tank.

2. A biogas-specific furnace according to claim 1, characterized in that: The water tank header is arranged in front of the corrosion-resistant combustion furnace, and the lower surface of the hot water exchange pipe is connected via a water inlet pipe, and the water inlet pipe is connected to the water tank header.

3. A biogas-specific furnace according to claim 2, characterized in that: The front of the stainless steel shell is connected to a water supply pipe that supplies water to the titanium alloy inner liner. The water supply pipe is connected to the water tank header. The upper surface of the titanium alloy inner liner is connected to an exhaust pipe. A first liquid level sensor is provided at the lower end of the right side of the partition, and a second liquid level sensor is provided at the upper end of the right side of the partition.

4. The biogas-specific furnace according to claim 1, characterized in that: An audible and visual alarm is provided at the left end of the upper surface of the stainless steel shell, an igniter is provided at the right end of the upper surface of the stainless steel shell, and an ignition end of the igniter is provided in the titanium alloy inner container.

5. The biogas-specific furnace according to claim 3, characterized in that: The first air inlet pipe, the second air inlet pipe, the water supply pipe and the second connecting pipe are all provided with a first solenoid valve.

6. A biogas-specific furnace according to claim 4, characterized in that: An infrared temperature sensor, a flow sensor, a MEMS methane sensor and an ionization flame detector are provided at the left end of the upper inner surface of the titanium alloy liner. The controller receives signals from the flow sensor and the infrared temperature sensor and outputs instructions to the electromagnetic proportional valve and the induced draft fan. When the MEMS methane sensor detects a concentration greater than 1% LEL, the electromagnetic proportional valve is closed. When the ionization flame detector detects flameout and the temperature is greater than 200°C, the sound and light alarm is activated.

7. The biogas-specific furnace according to claim 1, characterized in that: The titanium content of the titanium alloy inner liner is ≥90wt%, and the surface is treated by micro-arc oxidation to form an Al2O3 ceramic layer with a thickness of 5-10μm.

8. The biogas-specific furnace according to claim 1, characterized in that: The titanium alloy inner liner is provided with a first maintenance and replacement port corresponding to the activated carbon adsorption plate on both the front and rear sides of the left end. The first maintenance and replacement port is connected to the first cover plate via a first bolt, and a first sealing strip is provided around the first cover plate. The stainless steel outer shell is provided with a second maintenance and replacement port corresponding to the first maintenance and replacement port on both the front and rear sides of the left end. The second maintenance and replacement port is connected to the second cover plate via a second bolt, and a second sealing strip is provided around the second cover plate.

9. The biogas-specific furnace according to claim 1, characterized in that: A pressure detection gauge is connected to the upper end of the right side surface of the stainless steel shell, and support frames are provided at both left and right ends of the lower surface of the stainless steel shell.

10. The biogas-specific furnace according to claim 1, characterized in that: The right side of the buffer bin is connected to an air supply pipe, and a second solenoid valve is provided on the air supply pipe.

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