Energy-saving biogas surplus gas combustor

Abstract

The present invention relates to an energy-saving surplus gas combustion device for biogas. To realize this, the present invention comprises a combustion furnace that is installed at a certain height from the installation surface via a support and is configured as a cylindrical shape of a predetermined length with an open top, a cap installed on the open top via a plurality of supports, a ladder erected along the length direction on the outer perimeter, and a refractory insulation material installed in an annular shape along the inner perimeter inside, and a combustion furnace in which a through hole is formed in the center of the bottom surface and a plurality of air inlet holes are formed radially around the through hole; a surplus gas supply unit in which one end of a gas supply pipe connected to a gas blower penetrates through the through hole formed on the bottom surface of the combustion furnace and is located inside the combustion furnace; a gas branching unit installed on the upper surface of the bottom surface and connected to one end of the gas supply pipe, a plurality of branch pipes branched from the gas branching unit, and injection nozzles installed at the ends of the branch pipes so that surplus gas is injected through the injection nozzles, and an ignition device that provides an ignition source to the injection nozzles is of the combustion furnace. It is characterized by being configured to include a combustion burner unit that is installed upright so that the flame generating part penetrates the bottom surface and is close to the end of the injection nozzle.

Description

Technology Field

[0001] The present invention relates to a surplus gas incinerator that incinerates surplus gas remaining from a biogas facility, and more specifically, to an energy-saving surplus gas incinerator for biogas that can reduce operating costs by increasing ignition efficiency and stabilizing combustion through effective mixing of air and biogas through natural intake, and by operating without an air supply blower. Background Technology

[0002] Generally, as material life becomes more affluent along with industrial development, the treatment of high-concentration organic waste, such as food waste, sewage sludge, wastewater sludge, agricultural waste, and livestock manure, which is generated in large quantities, can be broadly classified into incineration, landfill, and recycling technologies, and recycling technologies are further divided into animal feed production and composting.

[0003] First, the incineration of organic waste has the problem of increasing the cost and time required for processing organic waste, as organic waste contains a large amount of moisture and must be pretreated to remove moisture or lower the moisture content before incineration. Additionally, there is a serious problem of causing secondary environmental pollution due to the generation of dioxins caused by incomplete combustion resulting from low calorific value and moisture content.

[0004] In addition, the landfilling of organic waste is a nationally prohibited practice because it secondarily contaminates the soil with leachate from the landfilled organic waste and causes odors, and it is a waste of recyclable resources and an issue of efficient use of limited land.

[0005] In addition, while feed production is the most widely adopted technology in terms of resource recycling, it has recently been associated with many problems as it requires very strict procedures during the processing stage. Regarding composting, there are aerobic and anaerobic methods. However, the aerobic method requires the use of moisture regulators (such as sawdust) to facilitate the respiration of aerobic microorganisms, which results in poor economic efficiency and causes problems with the atmosphere. On the other hand, the anaerobic treatment method is isolated from the atmosphere, which solves the odor problem. Furthermore, biogas (containing about 70% methane) that can be utilized is generated during the anaerobic treatment process, which has advantages in terms of energy utilization.

[0006] To explain more specifically regarding biogas, technologies related to the utilization of energy resources using organic waste are continuously being developed recently. An example of this is a method of producing biogas by anaerobic digestion of organic waste.

[0007] Since the produced biogas can be converted into electricity and thermal energy and utilized as byproducts such as fertilizer, its high utility necessitates continuous development.

[0008] In particular, as part of the process of converting food waste into resources, research on recycling food waste by converting it into methane gas—that is, research on anaerobic digestion—is currently being actively conducted. Anaerobic digestion is a process in which various complex symbiotic microbial communities decompose organic matter into methane and carbon dioxide under an oxygen-free environment.

[0009] Theoretically, about 90% of biodegradable organic matter in waste can be converted into methane, and furthermore, by stabilizing organic waste, the sludge produced after the anaerobic digestion process can be used as a soil conditioner and fertilizer without causing any environmental harm to the soil and water, thereby enabling further energy savings.

[0010] In addition, methane, a major component of biogas, is a versatile form of renewable energy that can be converted into heat and electricity to provide heating and lighting for homes and businesses, used as a raw material in the chemical industry, and used as fuel for vehicles.

[0011] And since this biogas contains methane, if the excess gas remaining after use in power generation facilities or boilers is released directly into the atmosphere, it causes environmental pollution such as global warming and poses a risk of explosion.

[0012] Therefore, since burning and discharging such biogas can reduce environmental pollution, the principle is to incinerate and discharge the remaining surplus gas through a surplus gas incinerator, and representative examples of incinerators for removing such surplus gas include the out-of-furnace combustion type and the in-furnace combustion type.

[0013] First, the external combustion method, which burns excess gas outside the furnace, has the advantages of low installation costs and a simple structure, but it has the disadvantage of causing many complaints regarding safety concerns because the flame is exposed too much above the combustion chamber during the combustion process, which is aesthetically unpleasing.

[0014] In addition, the in-furnace combustion method burns excess gas inside the furnace. Compared to the out-of-furnace combustion method, it has a more complex structure and requires higher installation costs. However, since combustion takes place inside the furnace and the flame is exposed to the outside less, it is mainly used because there is less potential for complaints.

[0015] Meanwhile, a combustion burner is installed at the lower side of the combustion chamber to burn excess gas, and through this combustion burner, excess gas and air are mixed and injected, and the excess gas is burned through ignition.

[0016] Here, forced air supply using a blower can be used to supply air to the combustion burner. However, this forced air supply requires related equipment such as blowers and piping, which increases manufacturing and installation costs. Additionally, as the number of parts increases, maintenance and management become relatively difficult. Furthermore, if a problem occurs with the blower, the operation of the surplus gas burner stops, making it difficult to properly dispose of the surplus gas.

[0017] In particular, when biogas with inconsistent calorific value and concentration is combusted, there were problems where air was supplied consistently through a blower—either excessively or insufficiently—leading to incomplete combustion, flame instability, and the emission of unburned gas, which is combustible gas that does not react with oxygen. Prior art literature

[0018] Republic of Korea Registered Patent No. 10-1770595 (Published August 24, 2017) The problem to be solved

[0019] The present invention was devised to solve the aforementioned problems, and aims to provide an energy-saving surplus gas burner for biogas that facilitates the manufacture of the surplus gas burner, reduces costs and energy associated with manufacturing and installation, provides convenience in maintenance and operation, and improves the combustion efficiency of surplus gas through stable combustion by supplying air to the combustion burner of the surplus gas burner through a natural air supply method rather than a forced air supply method using a blower.

[0020] The technical problems that the present invention aims to solve are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below. means of solving the problem

[0021] An energy-saving surplus gas burner for biogas according to one embodiment of the present invention for realizing the purpose described above is,

[0022] A combustion furnace in which air is naturally introduced, which is installed at a certain height from the installation surface via a support and is configured as a cylindrical shape of a predetermined length with an open top, a cap installed on the open top via a plurality of supports, a ladder erected along the length direction along the outer perimeter, and refractory insulation material installed in an annular shape along the inner perimeter, and a through hole formed in the center of the bottom surface to allow air to naturally flow in by the upward airflow generated during combustion, and a plurality of air inlet holes formed radially around the through hole;

[0023] An excess gas supply unit in which one end of a gas supply pipe connected to a gas blower penetrates through a through hole formed in the bottom surface of the combustion furnace and is located inside the combustion furnace, and

[0024] A gas branching section is installed on the upper surface of the floor surface and connected to one end of the gas supply pipe, and a plurality of branch pipes are branched and formed in the gas branching section, and an injection nozzle is installed covering the end of the branch pipe so that excess gas is injected through the injection nozzle, and an ignition device that provides an ignition source to the injection nozzle includes a combustion burner section that is installed upright so that a flame generating section is close to the end of the injection nozzle by penetrating the floor surface of the combustion furnace.

[0025] More preferably, when the internal temperature of the combustion furnace is above a set temperature (1000℃) through a temperature sensor installed in the combustion furnace, the operation of the combustion burner unit is stopped through a control unit to prevent accidents such as fire caused by overheating inside the excess gas burner, and when the internal temperature of the combustion furnace is below the set temperature, the combustion burner unit can be configured to be operated again through a control unit.

[0026] More preferably, an inspection facility capable of checking the temperature sensing unit and the internal condition of the combustion furnace is installed on the upper side of the ladder, and the inspection facility may be composed of a rectangular railing frame having an entrance formed at the bottom connected to the movement path of the ladder and footrests provided on both sides of the entrance.

[0027] More preferably, on the back surface of the floor surface, a sliding cover capable of controlling the opening range of the air inlet hole may be provided at each of the air inlet holes.

[0028] More preferably, the injection nozzle has an expanded section extending from the bottom of the cylindrical nozzle body, and the upper end of the branch pipe located inside the cylindrical nozzle body is fixed to the inner surface of the cylindrical nozzle body through at least one bracket, and the upper end of the cylindrical nozzle body may be provided with a vortex blade so that excess gas and air sprayed upward through the injection nozzle can be mixed to create a vortex.

[0029] More preferably, the vortex wing portion has a hole formed in the center, and a plurality of wings are arranged radially with a fan shape centered on the hole, and each wing may be configured in a shape where one side in the longitudinal direction is inclined with a height difference from the other side.

[0030] More preferably, the bottom surface of the combustion furnace has an elongated mounting hole formed therein so that the position can be moved while the ignition device passes through it, and elongated fastening holes are formed spaced apart on both sides facing each other with the mounting hole as the center, and a fixing bracket located on the back surface of the bottom surface through which the ignition device passes is fixed has a coupling hole corresponding to the fastening hole formed therein so that a fastening member can be fastened to the fastening hole through the coupling hole.

[0031] More preferably, a plurality of scales are formed along the long axis direction in the installation hole, and an ignition device installed through the installation hole may be provided with a corresponding indicator that corresponds to any one of the scales. Effects of the invention

[0032] The energy-saving surplus gas burner for biogas according to the present invention as described above has the following effects.

[0033] In other words, a combustion burner is installed at the bottom of the combustion chamber of a surplus gas burner, and the surplus gas and air are mixed and injected through this combustion burner to generate a flame through ignition, thereby burning the surplus gas inside the combustion chamber. By configuring the system so that air is supplied to the combustion burner naturally, equipment such as a blower or piping to supply air to the combustion burner is not required, which improves the manufacturability, maintenance, and operational convenience of the surplus gas burner. Furthermore, it provides energy and cost savings, as well as the effect of effectively mixing and controlling the air with the surplus gas to burn the surplus gas more stably.

[0034] In addition, by minimizing the drive unit of the surplus gas burner that must be operated in an emergency, it has the effect of enabling stable operation, and even if the concentration of methane in the biogas changes, only the amount of air required for combustion is introduced, thereby having the effect of satisfying the emission concentration standards for nitrogen oxides that may be emitted during combustion.

[0035] Furthermore, since the effects of the present invention described as described above are naturally manifested by the composition of the described content regardless of whether the inventor is aware of them, the aforementioned effects are merely a few effects based on the described content and should not be recognized as describing all effects perceived or actually existing by the inventor.

[0036] In addition, the effects of the present invention should be further understood from the overall description in the specification, and even if not explicitly stated, if an effect can be recognized as such by a person of ordinary knowledge in the technical field to which the described content belongs through the present specification, it should be considered as an effect described in the present specification. Brief explanation of the drawing

[0037] FIG. 1 is a perspective view showing an excess gas combustor according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of a key part showing an excess gas combustor according to one embodiment of the present invention. FIG. 3 is a plan view of a key part showing an excess gas combustor according to one embodiment of the present invention. FIG. 4 is a plan view showing the bottom surface of an excess gas burner according to one embodiment of the present invention. FIG. 5 is a cross-sectional view of a key part showing a gas branching section and an injection nozzle installed inside the lower part of an excess gas burner according to one embodiment of the present invention. FIG. 6 is a partial separation perspective view showing an injection nozzle installed at the bottom of an excess gas burner according to one embodiment of the present invention. Figures 7 (a) and 7 (b) are cross-sectional views of key parts showing the state in which the distance between an ignition device and an injection nozzle installed inside the lower part of an excess gas combustor according to one embodiment of the present invention is adjusted. Specific details for implementing the invention

[0038] The configuration and operation according to a preferred embodiment of the present invention will be described in detail below with reference to the attached drawings.

[0039] This is intended to provide a detailed explanation sufficient for a person skilled in the art to easily implement the contents of the present invention, and does not imply that the technical concept and scope of the present invention are limited thereby.

[0040] In addition, it should be noted that when assigning reference numerals to the components of each drawing, identical components are denoted by the same numeral whenever possible, even if they are shown in different drawings; furthermore, terms specifically defined in consideration of the structure and operation of the present invention may vary according to the intent or convention of the user or operator, and the definition of such terms should be determined based on the content throughout this specification.

[0041] First, the configuration of an energy-saving biogas surplus gas combustor according to one embodiment of the present invention can be broadly divided into a combustion chamber that guides the surplus gas to be combusted and discharged into the atmosphere, a surplus gas supply unit that supplies surplus gas to the combustion chamber, and a combustion burner unit that combusts the surplus gas by supplying an ignition source to the surplus gas and air mixed and supplied to the combustion chamber. The components are examined in more detail as follows.

[0043] First, the combustion furnace (100) is,

[0044] As illustrated in FIGS. 1 and 2, a combustion space for burning excess gas is provided, which is configured as a cylindrical shape with an open top, and excess gas and air are supplied to the bottom and ignited to burn, and smoke generated during the combustion process of the excess gas is discharged to the top.

[0045] And the bottom of the combustion furnace (100) maintains a constant height from the installation surface through the support (110), and the top of the combustion furnace (100) has a cap (130) installed at a spaced-apart state from the multiple supports (120) installed on the outer perimeter, so that rainwater or foreign matter can be prevented from entering the interior of the combustion furnace (100) through this cap (130), and smoke from the combustion excess gas can be discharged between the top of the combustion furnace (100) and the cap (130).

[0046] Additionally, a ladder (140) necessary for inspection, etc., may be erected along the length of the outer perimeter of the combustion furnace (100), and such a ladder (140) may further include a separate inspection facility (150).

[0047] Here, the inspection facility (150) may be installed on the upper side in the longitudinal direction of the ladder (140) as an embodiment, and may be composed of a railing frame (153) in the shape of an overall rectangular prism, in which an entrance (151) connected to the movement path of the ladder (140) is formed at the bottom of the inspection facility (150) and steps (152) are provided on both sides of such entrance (151).

[0048] Therefore, when using the inspection facility (150), equipment can be placed on the platform (152) of the inspection facility (150) or stepped on to perform inspection work safely and conveniently. Additionally, multiple workers can climb up together to perform inspection work through this inspection facility (150), thereby doubling the efficiency of the inspection work.

[0049] Meanwhile, the combustion furnace (100) needs to be configured so that the combustion furnace (100) is not deformed by the temperature as excess gas is combusted inside at a temperature of approximately 800 to 900°C. To this end, a refractory insulation material may be installed in an annular shape around the inner circumference of the combustion furnace (100). For example, a plurality of roughly rectangular plate-shaped refractory insulation materials having a certain thickness and a certain width and length may be connected to each other along the inner circumference of the combustion furnace (100) to form an overall annular shape, with each back surface in contact with the inner circumference of the combustion furnace (100). The edges of each plate-shaped refractory insulation material may not overlap with each other, and the edges may be connected so that the outer surfaces of the edges are in contact with each other.

[0050] And, as fixing pins are formed to protrude a certain length toward the center of the combustion furnace (100) while maintaining a certain distance in the upper, lower, left, and right directions on the inner circumference of the combustion furnace (100), the plate-shaped refractory insulation material can be fixed in a state where it is in contact with the inner circumference of the combustion furnace through the fixing pins, as the back surface of the plate-shaped refractory insulation material is fitted into these fixing pins and the end of the fixing pin is exposed to the outside through the surface for a certain length.

[0051] In addition, with the plate-type refractory insulation installed around the inner circumference of the combustion furnace (100) in this manner, a plurality of foldable refractory insulation materials may be installed along the surface of the plate-type refractory insulation material in an annular shape with their outer sides in close contact with each other. In this case, the inner circumference of the combustion furnace (100) may have the plate-type refractory insulation material and the foldable refractory insulation material installed in a double layer.

[0052] Here, the foldable refractory insulation can be composed of multiple layers having the same width and length by folding a roughly rectangular refractory insulation with a constant thickness, width, and length into a zigzag shape like a folding screen, and the inner sides facing each other while folding can be in close contact with one another.

[0053] And, as a fixing member is formed on the inner circumference of the combustion furnace (100) with a fixed length protruding toward the center of the combustion furnace (100) while maintaining a fixed distance in the up, down, left, and right directions, the plate-shaped refractory insulation material also passes through this fixing member first, and the foldable refractory insulation material can be fitted and installed in the fixing member that passes through the plate-shaped refractory insulation material.

[0054] Therefore, the fixing pin secures the plate-type refractory insulation, and the fixing device can secure both the plate-type refractory insulation and the foldable refractory insulation together.

[0055] When a foldable refractory insulation is fitted into such a fixing device, the rear side of the foldable refractory insulation is fitted into the fixing device, and the rear portion of the foldable refractory insulation that folds into a curve is fitted into the fixing device, and the outer sides on both sides are closely connected to the outer sides of adjacent foldable refractory insulation.

[0056] At this time, if the end of the fixing member that is fitted to the back side of the foldable refractory insulation protrudes from the surface of the foldable refractory insulation, it may be deformed by the high temperature inside the combustion furnace (100), so it is preferable that the end of the fixing member is configured so as not to protrude from the surface of the foldable refractory insulation.

[0057] In addition, the outer sides of adjacent foldable refractory insulation materials are in close contact with each other. At this time, to prevent the outer sides of adjacent foldable refractory insulation materials from separating, they are connected to each other via connecting pins. One end of the connecting pin is inserted through the outer side of one foldable refractory insulation material from an adjacent foldable refractory insulation material, and the other end of the connecting pin is inserted through the outer side of the other foldable refractory insulation material from an adjacent foldable refractory insulation material. In this way, the foldable refractory insulation materials connected with their outer sides in contact with each other via multiple connecting pins can be firmly fixed.

[0058] Accordingly, the interior of the combustion furnace (100) can have an effective insulation effect through a double structure of plate-type refractory insulation and foldable-type refractory insulation, thereby improving the durability of the combustion furnace (100). In particular, since the foldable-type refractory insulation is configured to be folded in a zigzag shape, heat conduction can be delayed, which can further enhance the insulation effect.

[0059] And when the combustion temperature of the combustion furnace (100) rises above the necessary level, incomplete combustion occurs, and the amount of NOx generated increases. Therefore, by connecting a cooling means, such as a cooling air supply pipe connected to a cooling fan, to the combustion furnace (100), when the internal temperature of the combustion furnace (100) exceeds a set value and a temperature sensor installed inside or outside the combustion furnace (100) detects this, the cooling fan is automatically operated through the control unit and cooling air is supplied to the combustion furnace (100) through the cooling air supply pipe, thereby allowing the combustion temperature of the combustion furnace (100) to be maintained at the set temperature.

[0060] Alternatively, if the combustion temperature of the combustion furnace (100) rises above a set temperature, a temperature sensor installed in the combustion furnace (100) detects this and stops the operation of the combustion burner unit (300) through the control unit, and accordingly, if the combustion temperature of the combustion furnace (100) falls below the set temperature, a temperature sensor installed in the combustion furnace (100) detects this and restarts the operation of the combustion burner unit (300) through the control unit, and stopping and restarting the operation of the combustion burner unit (300) can be operated, for example, using a PLC program included in the control unit.

[0061] Meanwhile, as illustrated in FIGS. 3 and 4, air can be supplied into the combustion furnace (100) through the bottom surface (160) at the bottom of the combustion furnace (100). As an example of supplying air into the combustion furnace (100), a through hole (161) is formed in the center of the bottom surface (160) of the combustion furnace (100), and the end of the gas supply pipe (220), which will be described later, is installed through this through hole (161). As a plurality of air inlet holes (162) are formed radially around the through hole (161), air can be introduced into the combustion furnace (100) through these air inlet holes (162) by the negative pressure and heat rising flow generated during the combustion process inside the combustion furnace (100). The incoming air is mixed with excess gas sprayed from the spray nozzle (330) and generates a flame through the ignition of the ignition device (340).

[0062] Here, the air inlet port (162) is designed so that flow resistance is minimized, so that an appropriate amount of air is supplied into the combustion chamber (100) through natural suction without the use of equipment such as an air blower, and an appropriate mixing ratio with excess gas can be maintained so that complete combustion is possible.

[0063] In addition, the shape of the air inlet (162) does not need to be fixed to any one shape, and may be configured in a fan shape, a circle, or a polygonal shape such as a triangle or a square, as exemplified.

[0064] In addition, since the amount of air flowing into the combustion furnace (100) can be determined by the number and size of the air inlet holes (162), it is desirable to adjust the number and size of the air inlet holes (162) in consideration of the required amount of air flowing in. In order to control the amount of air flowing in, a sliding cover capable of controlling the opening range of the air inlet holes (162) is installed on the back surface of the bottom surface (160) for each air inlet hole (162). By adjusting the opening range of the air inlet holes (162) according to the degree of opening and closing of the sliding cover, the amount of air flowing into the combustion furnace (100) can be varied.

[0066] The surplus gas supply unit (200) is,

[0067] As shown in FIG. 2, it may be configured to include a gas supply pipe (220) through which excess gas is moved and a gas blower (210) for transporting excess gas into the combustion furnace. The gas blower (210) is connected to the gas supply pipe (220) located outside the combustion furnace (100). Through this gas blower (210), excess gas moving through the gas supply pipe (220) can be moved to one end of the gas supply pipe (220), and one end of the gas supply pipe (220) is installed through a through hole (161) formed in the bottom surface (160) of the combustion furnace (100) and is located inside the combustion furnace (100).

[0068] Of course, surplus gas from the biogas production facility may be supplied directly into the combustion furnace (100) through the gas supply pipe (220) without using a gas blower, and as illustrated, a gas blower (210) is installed on the pipe of the gas supply pipe (220), so that when the supply pressure of the surplus gas moving into the combustion furnace (100) through the gas supply pipe (220) from the biogas production facility is lower than the set pressure, the gas blower (210) is automatically operated to maintain an appropriate supply pressure of the surplus gas moving into the combustion furnace (100).

[0069] In addition, the gas supply pipe (220) may further include a supply control means, such as a valve, for controlling the amount of excess gas supplied into the combustion furnace (100) as needed, and may also include a flashback prevention means to prevent the flame of the combustion furnace (100) from flashing back toward the gas supply pipe (220).

[0071] The combustion burner section (300) is,

[0072] As illustrated in FIGS. 2 and 5, the combustion furnace (100) may be configured to include a gas branching section (310) connected to one end of a gas supply pipe (220) inside the combustion furnace (100), a plurality of branch pipes (320) branched from the gas branching section (310), a spray nozzle (330) connected to the end of such branch pipe (320) to spray excess gas, and an ignition device (340) installed in close proximity to the spray nozzle (330) to provide an ignition source to the spray nozzle (330).

[0073] This combustion burner unit (300) is installed inside the lower part of the combustion furnace (100) and ignites the excess gas supplied mixed with air inside the combustion furnace (100) to burn the excess gas.

[0074] The gas branching section (310) constituting the combustion burner section (300) serves to disperse excess gas supplied from the gas supply pipe (220) to a plurality of injection nozzles (330), and is installed in the lower internal center of the combustion furnace (100) and the gas supply pipe (220) is connected to the bottom surface, so that excess gas supplied through the gas supply pipe (220) can be naturally distributed to each injection nozzle (330) while temporarily stored inside.

[0075] Preferably, although not illustrated in the drawing, the gas branch section (310) may further be provided with a means of guiding excess gas, such as a guide, to properly guide the excess gas to each injection nozzle (330).

[0076] And the branch pipe (320), which is connected to the gas branch section (310) and moves excess gas to the injection nozzle (330), can be formed by extending horizontally from the side of the gas branch section (310) and then bending upward.

[0077] And the injection nozzle (330) constituting the combustion burner section (300) is connected to the end of the branch pipe (320) and serves to inject excess gas moving through the branch pipe (320) upward. As illustrated in FIGS. 5 and 6, this injection nozzle (330) is composed of a cylindrical nozzle body (331), and the lower end of the cylindrical nozzle body (331) is composed of an expanded section (332) in an expanded state. As a result, air can be more easily introduced into the interior of the cylindrical nozzle body (331) through this expanded section (332). Furthermore, as the inner diameter gradually narrows from the expanded section (332) toward the cylindrical nozzle body (331), the speed of air movement can be increased by the Venturi effect, allowing external air to be effectively introduced into the cylindrical nozzle body (331).

[0078] Of course, the cylindrical nozzle body (331), excluding the expansion portion (332), may also be configured in a conical shape, with the inner diameter gradually narrowing from bottom to top, rather than being straight.

[0079] Inside the cylindrical nozzle body (331), the upper end of the branch pipe (320) and the inner surface of the cylindrical nozzle body (331) can be fixed through one or more brackets (333) so that the upper end of the branch pipe (320) can be positioned at the center and fixed.

[0080] If necessary, a spiral guide or a spiral groove is added to the inner surface of the cylindrical nozzle body (331), so that air discharged to the upper outside through the cylindrical nozzle body (331) is discharged in a vortex form through the guide or groove, and is effectively mixed with excess gas sprayed from the branch pipe (320) and effectively discharged.

[0081] In addition, the upper part of the cylindrical nozzle body (331) may be configured to be simply open, but it may also be configured to have a vortex wing portion (334) formed on the upper part of the cylindrical nozzle body (331) so that the excess gas discharged from the branch pipe (320) and the air discharged to the upper outside through the cylindrical nozzle body (331) can be more effectively mixed and discharged.

[0082] For example, the vortex wing section (334) has a hole (334a) formed in the center, and a plurality of wings (334b) are arranged radially with a fan shape centered on the hole (334a). Each wing (334b) is configured such that one side in the same length direction is inclined with a height difference from the other side, thereby causing a vortex phenomenon so that the excess gas and air flowing into the cylindrical nozzle body can be effectively mixed and diffused.

[0083] Here, the vortex wing portion (334) may be formed integrally on the top of the cylindrical nozzle body (331) or formed in an assembled form, and the vortex wing portions (334) formed on a plurality of cylindrical nozzle bodies (331) may be formed in the same shape or different shapes.

[0084] Meanwhile, when excess gas is combusted, the heat source being combusted is methane (CH4), and since the excess gas is a biological gas, the concentration of methane is within a certain range but cannot always be maintained at a constant concentration. Due to these changes, when excess gas with a methane concentration is combusted, if the required amount of air is supplied at a fixed rate by a blower for air supply, it may be difficult to meet the emission concentration standards for nitrogen oxides (NOx) due to an oversupply of air required for combustion or a shortage of air.

[0085] Accordingly, the present invention is configured such that the concentration of nitrogen oxides after combustion is within the standard even at varying methane concentrations, and thus the mixing ratio of air and excess gas, that is, the amount of air required for methane combustion, can be naturally mixed, so the emission concentration of nitrogen oxides after combustion can be within the standard, and the pressure of the excess gas flowing into the combustion furnace (100) can be completely combusted even in a low-pressure state.

[0086] And the ignition device (340), which provides an ignition source for the air and excess gas mixed and sprayed from the spray nozzle (330), is installed such that the upper flame generating part (341) penetrates the bottom surface (160) of the combustion furnace (100) as illustrated in FIGS. 2, 3, and 4, and is positioned close to the spray nozzle (330) inside the combustion furnace (100). When the excess gas and air mixed at an appropriate mixing ratio are sprayed through the spray nozzle (330), ignition is achieved through the flame generated from the flame generating part (341), thereby allowing the excess gas inside the combustion furnace (100) to be burned.

[0087] Here, the distance between the ignition device (340) and the tip of the injection nozzle (330) is important. When the ignition device (340) is installed on the bottom surface (160) of the combustion furnace (100), the tolerance that occurs, or the amount of mixed air and excess gas injected from the injection nozzle (330), the injection range, and the injection speed, if the distance between the ignition device (340) and the injection nozzle (330) is not appropriate, the ignition of the mixed air and excess gas injected may not occur.

[0088] Accordingly, as illustrated in FIGS. 4 and 7, it is preferable that the ignition device (340), which is installed by penetrating the bottom surface (160) of the combustion furnace (100), be configured so that the distance from the injection nozzle (330) can be adjusted.

[0089] That is, after the ignition device (340) is installed in a position that penetrates the bottom surface (160) of the combustion furnace (100), an elongated mounting hole (163) may be formed on the surface so that its position can be varied in the horizontal direction, and elongated fastening holes (164) may be formed spaced apart on both sides facing the mounting hole (163), and a coupling hole (343) corresponding to the fastening hole (164) may be formed on a disc-shaped fixing bracket (342) located on the back surface of the bottom surface (160) through which the ignition device (340) is fixed.

[0090] Accordingly, when the upper side of the ignition device (340) is inserted into the installation hole (163) from the bottom surface (160) to install it, the upper surface of the fixing bracket (342) comes into contact with the back surface of the bottom surface (160). At this time, the ignition device (340) can be installed on the bottom surface (160) by fastening the fastening member (344) while the fastening hole (164) of the bottom surface (160) and the coupling hole (343) of the fixing bracket (342) are aligned with each other.

[0091] And if, after the ignition device (340) is installed on the bottom surface (160) of the combustion furnace (100), during use the distance between the ignition device (340) and the injection nozzle (330) becomes relatively far as in FIG. 7 (a), and the ignition source of the ignition device (340) is not accurately transmitted to the injection nozzle (330), the fastening member (344) is first loosened so that the ignition device (340) can move freely within the installation hole (163), and then the distance between the ignition device (340) and the injection nozzle (330) is adjusted to be close as in FIG. 7 (b). At this time, as the ignition device (340) moves, the fastening member (344) moves together with the fixing bracket (342) within the fastening hole (164) formed in an elongated shape on the bottom surface (160), and when the moved fastening member (344) is fastened again, the position of the ignition device (340) is changed and fixed. The distance from the spray nozzle (330) can be adjusted.

[0092] Here, around the elongated mounting hole (163) formed on the bottom surface (160), a plurality of scales are formed along the long axis direction of the mounting hole (163) along with dimensions by means such as engraving, and a display part corresponding to one of these scales is formed on the ignition device (340). Then, the distance between the ignition device (340) and the injection nozzle (330) can be adjusted more accurately and effectively by using the display part of the ignition device (340) and the scale of the mounting hole (163).

[0093] As described above, the detailed description of the present invention has explained specific embodiments, but it is understood that various modifications are possible within the scope of the described content. Therefore, the scope of the described content does not need to be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof. Explanation of the symbols

[0094] 100 : Combustion furnace 10 : Base 120 : Support 130 : Cap 140 : Ladder 150 : Inspection facilities 151 : Entrance 152 : Footrest 153 : Handrail frame 160 : Floor surface 161 : Penetration hole 162 : Air inlet hole 163 : Installer 164 : Fastener 200: Surplus gas supply unit 210: Gas blower 220: Gas supply pipe 300: Combustion burner section 310: Gas branch 320: Branch pipe 330 : Spray nozzle 331 : Cylindrical nozzle body 332 : Expander 333 : Bracket 334: Vortex vane 334a: Hole 334b : Wing 340 : Ignition device 341: Spark generator 342: Fixing bracket 343 : Connecting hole 344 : Fastening member

Claims

Claim 1 A combustion furnace (100) is installed at a certain height from the installation surface via a base (110), configured as a cylindrical shape of a predetermined length with a closed bottom and an open top, a cap (130) is installed on the open top via a plurality of supports (120), a ladder (140) is erected along the length direction on the outer circumference, and a refractory insulation material is installed in an annular shape along the inner circumference inside, and a through hole (161) is formed in the center of the bottom surface (160), and a plurality of air inlet holes (162) are formed radially around the through hole (161); and an excess gas supply unit (200) in which one end of a gas supply pipe (220) connected to a gas blower (210) penetrates through the through hole (161) formed in the bottom surface (160) of the combustion furnace (100) and is located inside the combustion furnace (100). A gas branching section (310) is installed on the upper side of the bottom surface (160) and connected to one end of the gas supply pipe (220), and a plurality of branch pipes (320) are formed spaced apart from each other on the outer circumference of the gas branching section (310), and a spray nozzle (330) is installed at the end of the branch pipe (320) so that excess gas is sprayed through the spray nozzle (330), and an ignition device (340) that provides an ignition source to the spray nozzle (330) is installed upright so that a flame generating section (341) is close to the end of the spray nozzle (330) by penetrating the bottom surface (160) of the combustion furnace (100), and the air mixed with the excess gas is configured to naturally flow in from the outside through the air inlet hole (162) by means of negative pressure and heat rising flow generated during the combustion process, thereby forming a natural air supply type combustion burner section (300);The above includes, and inside the gas branch section (310), a surplus gas guiding means is installed so that the surplus gas moving to the gas supply pipe (220) can be guided to the branch pipe (320), and the injection nozzle (330) has an expanded section (332) in an expanded form extended at the bottom of the cylindrical nozzle body (331), and the upper end of the branch pipe (320) located inside the cylindrical nozzle body (331) is fixed to the inner surface of the cylindrical nozzle body (331) through at least one bracket (333), and at the upper end of the cylindrical nozzle body (331), a disc-shaped vortex wing section (334) is horizontally and integrally installed so that the surplus gas and air sprayed upward through the injection nozzle (330) can be mixed to create a vortex and discharged, and the vortex wing section (334) has a hole (334a) in the center An energy-saving surplus gas burner for biogas, characterized in that a plurality of wings (334b) are spaced apart and arranged radially with a fan shape centered on the hole (334a), and each wing (334b) is configured such that one side in the longitudinal direction is inclined with a height difference from the opposite side, and a spiral guide or spiral groove is added to the inner surface of the nozzle body (331) so that air discharged to the upper outside through the interior of the nozzle body (331) moves in a vortex form. Claim 2 An energy-saving surplus gas burner for biogas according to claim 1, characterized in that when the internal temperature of the combustion furnace (100) is above a set temperature through a temperature sensor installed in the combustion furnace (100), the operation of the combustion burner unit (300) is stopped through a control unit, and when the internal temperature of the combustion furnace (100) is below the set temperature, the combustion burner unit (300) is operated again through a control unit. Claim 3 An energy-saving biogas surplus gas burner according to claim 2, wherein an inspection facility (150) capable of inspecting the temperature sensing unit and the internal condition of the combustion furnace (100) is installed on the upper side of the ladder (140), and the inspection facility (150) is composed of a rectangular railing frame (153) having an entrance (151) formed at the bottom that connects to the movement path of the ladder (140) and footrests (152) provided on both sides of the entrance (151). Claim 4 An energy-saving surplus gas burner for biogas according to claim 1, characterized in that a sliding cover capable of controlling the opening range of the air inlet holes (162) is provided on each of the air inlet holes (162) on the back surface of the bottom surface (160). Claim 5 delete Claim 6 delete Claim 7 An energy-saving surplus gas burner for biogas according to claim 1, wherein an elongated mounting hole (163) is formed in the lower bottom surface (160) of the combustion furnace (100) so that the position of the ignition device (340) can be moved while penetrating therethrough, and elongated fastening holes (164) are formed spaced apart on opposite sides centered on the mounting hole (163), and a fixing bracket (342) located on the back surface of the bottom surface (160) through which the ignition device (340) is penetrating and fixed has a coupling hole (343) corresponding to the fastening hole (164) formed therein, and a fastening member (344) is configured to be fastened to the fastening hole (164) through the coupling hole (343). Claim 8 An energy-saving surplus gas burner for biogas according to claim 7, wherein the installation hole (163) forms a plurality of scales along the long axis direction, and the ignition device (340) installed through the installation hole is provided with a matching indicator corresponding to any one of the scales.

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