Processing device

Abstract

To provide a processing device that performs deodorization or the like of odorous gas using flammable gas including LP gas as fuel, which can prevent odorous gas supplied to the processing device from leaking out of the processing device.SOLUTION: A processing device comprises a processing chamber for heating and processing odorous gas discharged from a secondary side of a vacuum pump during pumping-up work by a vacuum vehicle. The processing chamber is provided with: an odorous gas introduction path for introducing the odorous gas into the processing chamber; a fuel gas supply path for supplying fuel gas for forming combustion flame by combustion; an air supply path through which air can be supplied from the atmosphere so that the air can be mixed with the fuel gas and combusted; and an ignition device for igniting mixed gas including the supplied fuel gas. Path blocking means that can block communication between the processing chamber and the atmosphere is provided on the air supply path.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a treatment device for treating odorous gases containing various harmful gas components that are generated when composting organic waste such as livestock manure and food waste, or particularly when collecting human manure, by exposing the gases to high temperatures to decompose the harmful gas components and reduce their concentration. [Background technology]

[0002] Human and livestock excrement, food waste, and other organic waste produce odorous gases containing harmful components such as hydrogen sulfide and ammonia during decomposition, and it is desirable to prevent these gases from escaping into the environment as much as possible. In particular, in areas where sewerage systems are not fully equipped, it is common to use a so-called vacuum truck to collect human excrement from a storage tank using a vacuum pump into a tank mounted on the vacuum truck, and then transport the collected excrement to a designated sewage treatment facility for treatment. In this process, it is undesirable to release odorous gases into the human living environment.

[0003] The collection of feces and urine by a vacuum truck is carried out by using a vacuum pump to reduce the pressure inside the tank that stores the feces and urine and inside the suction hose connected to the tank, creating a pressure difference between these and atmospheric pressure, and this pressure difference is used to suck the feces and urine out of the storage tank, during which time odorous gases containing harmful components are released on the secondary side of the vacuum pump.

[0004] Conventionally, odorous gas treatment devices have been used to guide the odorous gases released from the vacuum pump of the vacuum truck into a combustion device having a variety of structures, and expose them to high temperatures inside the combustion device to decompose harmful gas components and reduce their concentration.

[0005] For example, Patent Document 1 describes a deodorizing device that uses a liquid fuel such as diesel fuel, which is mixed with air by spraying it into the air for combustion, and then ignites it in a combustion chamber using an ignition mechanism, using a burner to inject the combustion flame generated from the burner into a secondary combustion chamber, and introduces odorous gases released from the secondary side of the vacuum pump of a vacuum truck into the secondary combustion chamber and mixes them with the combustion flame, thereby raising the temperature of the odorous gases and reducing the concentration of various gas components contained in the odorous gases.

[0006] In a deodorizing device that uses diesel or the like as fuel, as described in Patent Document 1, the fuel (diesel) of the vacuum truck that carries it can be diverted and used to generate the combustion flame for deodorization, so it can operate continuously without the need to prepare fuel for the deodorizing device separately, and is therefore widely used.

[0007] On the other hand, in burners that use liquid fuel such as diesel oil, it is required to suppress the generation of NOx while suppressing the generation of tar, soot, etc. by completely combusting the diesel oil, etc., but it is not always easy to satisfy this requirement. For this reason, for example, in the burner described in Patent Document 2, when introducing combustion air into the combustion chamber at a predetermined ratio using a blower and spraying fuel into the combustion air, various controls are required to mix the two well and maintain an ideal combustion state, such as providing various mechanisms in the flow path.

[0008] In the deodorizing device described in Patent Document 1, odorous gases are deodorized by mixing the odorous gases released from the secondary side of the vacuum pump of a vacuum truck with the combustion flame generated by a burner device such as that described in Patent Document 2. However, in the process of treating odorous gases containing parts of feces and urine, dirt accumulates inside the burner, making it difficult to maintain good combustion conditions, and therefore maintenance such as periodic replacement of burner components is required.

[0009] On the other hand, as described in Patent Documents 3 and 4, etc., there is known a deodorizing device that uses a combustible gas such as LP gas as fuel, mixes the combustible gas with air, and burns the combustible gas to generate a combustion flame, thereby raising the temperature of the odorous gas and thereby reducing the concentration of various gas components contained in the odorous gas.

[0010] Combustible gases such as LP gas are easily mixed with combustion air, can be burned over a wide range of air-fuel ratios, and the generation of tar and other substances due to incomplete combustion is suppressed. For this reason, as in the deodorizing devices described in Patent Documents 3 and 4, a good combustion state can be maintained even with a simple structure such as providing vents that communicate with the external space (atmosphere) around the nozzle that ejects the flammable gas, and compared to the deodorizing devices that use liquid fuels such as diesel, the structure of the deodorizing device can be simplified, for example, by eliminating the need for complex accessories for spraying the fuel.

[0011] Therefore, deodorizing equipment that uses flammable gases such as LPG as fuel not only reduces installation costs but also reduces the maintenance costs of the deodorizing equipment.Furthermore, compared to when kerosene (diesel) is used, there are advantages such as reduced fuel costs per unit of operation. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Japanese Patent Application Publication No. 9-137933 [Patent Document 2] Japanese Patent Application Publication No. 9-72511 [Patent Document 3] Japanese Patent Application Publication No. 10-54515 [Patent Document 4] Japanese Patent Application Publication No. 7-293850 Summary of the Invention [Problem to be solved by the invention]

[0013] The amount of work performed by the vacuum pump of the vacuum truck is set to a level that allows the fluid feces and urine to be steadily sucked up at a predetermined speed through a hose by reducing the pressure inside the tank of the vacuum truck to a predetermined pressure. During this steady operation, the secondary side (exhaust side) of the vacuum pump is set to a slightly positive pressure relative to atmospheric pressure, and this pressure causes the odorous gas in the tank to be supplied from the secondary side of the vacuum pump to the deodorizing device.

[0014] In the deodorizing device, the flow resistance of odorous gases and the like in the processing chamber and the like inside is set to a level that does not interfere with exhaust from the secondary side of the vacuum pump, but in order to efficiently heat the odorous gas and increase the retention time within the deodorizing device, narrow passages and the like are generally provided to extend the flow path of the odorous gas, and it is unavoidable that a certain amount of flow resistance will be exhibited due to the flow path of the odorous gas.

[0015] On the other hand, when pumping out feces and urine, for example, when the amount of feces and urine remaining in the storage tank decreases and atmospheric air flows in through the pumping hose, the pressure inside the tank of the vacuum truck, which is the primary side of the vacuum pump, approaches atmospheric pressure, and the volume per unit time (volume under standard conditions) of the odorous gas discharged by the vacuum pump and fed into the deodorizing device increases compared to the steady state described above, and fluctuations in the amount of odorous gas supplied to the deodorizing device are unavoidable.

[0016] In particular, when the amount of odorous gas supplied from the vacuum pump to the deodorizing device described in Patent Documents 1, 3, 4, etc. increases, the pressure inside the deodorizing device rises to a range exceeding atmospheric pressure due to the flow resistance within the deodorizing device.

[0017] In the case of a deodorizing device that uses diesel fuel, etc., as described in Patent Document 1, it is common to have a blower that pressurizes and supplies combustion air in order to efficiently combust diesel, etc. Therefore, even when the pressure inside the deodorizing device increases due to an increase in pressure on the secondary side of the vacuum pump as described above, the supply pressure generated by the blower makes it possible to supply combustion air into the burner, and problems such as odorous gases flowing back through the path that supplies the combustion air and being released into the environment are unlikely to occur.

[0018] On the other hand, in conventional deodorizing devices having a structure as described in Patent Documents 3 and 4, which burn combustible gases such as LPG using unpressurized combustion air taken in from the atmosphere, when the pressure inside the deodorizing device increases due to odorous gases, the odorous gases leak out of the deodorizing device through the path that takes in the combustion air (for example, the communication holes 7, 31 in Figure 1(b)), causing a problem of harming the surrounding environment.

[0019] In order to solve the above problems, the present invention aims to provide a treatment device that deodorizes odorous gases that use flammable gases such as LP gas as fuel, and that can prevent odorous gases supplied to the treatment device from leaking outside the treatment device. [Means for solving the problem]

[0020] In order to solve the above problems, the present invention provides the following processing apparatus. (1) A treatment device having a treatment chamber for heating and treating odorous gases released from the secondary side of a vacuum pump during pumping operations using a vacuum truck, the treatment chamber being provided with an odorous gas introduction path for introducing the odorous gas into the treatment chamber, a fuel gas supply path for supplying fuel gas for forming a combustion flame by combustion, an air supply path capable of supplying air from the atmosphere in a form that can be mixed with the fuel gas and combustible, and an ignition device for igniting the mixed gas containing the supplied fuel gas, and the air supply path having a path closing means capable of closing the communication between the treatment chamber and the atmosphere. (2) The treatment device as described above, wherein the path closing means is an on-off valve. (3) The processing apparatus has a pressure gauge for detecting the pressure in the processing chamber, and when the measured value of the pressure gauge reaches or exceeds a predetermined pressure, the opening / closing valve is closed. (4) In the processing apparatus, the path closing means is a check valve that closes the air supply path when gas attempts to flow out of the processing chamber. (5) The treatment device as described above, wherein the path closing means is a path switching valve, and the air supply path can be connected to either the atmosphere or an odorous gas introduction path. (6) A vacuum truck equipped with any of the above treatment devices. [Effects of the Invention]

[0021] According to the present invention, it is possible to suppress leakage of odorous gases compared to conventional deodorizing treatment devices that use flammable gases such as LP gas as fuel. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a diagram showing the structure of a conventional odorous gas deodorizing device. [Figure 2] This is a schematic diagram showing how a vacuum truck collects feces and urine from inside a storage tank and puts them into a tank. [Figure 3] 1 is a schematic diagram showing an example (Example 1) of a processing apparatus according to the present invention. [Figure 4] FIG. 2 is a schematic diagram showing an example (Example 2) of a processing apparatus according to the present invention. [Figure 5] FIG. 1 is a schematic diagram showing an example (Example 3) of a processing apparatus according to the present invention. [Figure 6] FIG. 1 is a schematic diagram showing an example (Example 4) of a processing apparatus according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] The structure of a conventional deodorizing device for odorous gases will be explained below using the deodorizing device described in Patent Document 3 as an example. Figure 1 shows the deodorizing device described in Patent Document 3 (Figure 1(a)) and a burner unit used in the deodorizing device (Figure 1(b)).

[0024] In this deodorizing device, a burner device (1) that generates a flame by burning gas is installed near the bottom of the combustion tube (17), and odorous gas is introduced into the flame of the burner device from the water-air separation chamber (12) through the air guide pipe (14), exposing the odorous gas to high temperatures to break down harmful components such as hydrogen sulfide and ammonia, thereby eliminating the bad odor (Figure 1(a)).

[0025] The burner device (symbol 1) ejects flammable gas from a fuel injection nozzle (symbol 3), and has vents (symbols 7, 31, 35) that communicate with the atmosphere located near the fuel injection nozzle, allowing air to be drawn in and mixed with the flammable gas, which is then ignited by a spark plug (symbol 4), allowing the flame to be emitted upward (Figure 1(b)).

[0026] Combustible gases such as LP gas mix easily with air, and because they are generally composed of molecules with smaller molecular weights than diesel fuel, they can easily combine with oxygen in the air to complete the combustion reaction. In other words, by using LP gas and other combustible gases as fuel, they can be burned without producing tar or soot over a relatively wide range of mixing ratios with air, making it possible to configure an effective burner device with a simpler structure than oil burners, as shown in Figure 1(b).

[0027] In the structure shown in Figure 1(a), a burner device is installed near the bottom of the combustion tube, which is open upward. This causes high-temperature gas generated by the combustion of gas to be released upward through the inside of the combustion tube, generating negative pressure near the burner. As a result, fresh air is continuously drawn in through the vent hole that communicates with the outside air (atmosphere), and combustion continues uninterrupted.

[0028] 2 shows a schematic diagram of how a vacuum truck is used to collect feces and urine 26 and the like from inside storage tank 22 into the tank 21 of the vacuum truck. Collection of feces and urine 26 and the like is carried out by operating vacuum pump 20 to reduce the pressure inside tank 21, which is connected to suction pipe 24, through the inside of suction pipe 24, and inserting the tip of suction hose 23, which is connected to tank 21, into feces and urine 26 inside storage tank 22. Meanwhile, gas (odor gas) exhausted from inside tank 21 by operation of vacuum pump 20 is led via exhaust pipe 25 to treatment device 100 for deodorization, where it is deodorized and then released into the atmosphere.

[0029] The vacuum pump 20 used has the capacity to maintain a predetermined pressure difference between atmospheric pressure and the inside of the tank 21 in order to generate a workload corresponding to the volume of feces and urine 26 to be sucked into the tank 21 per unit time. The treatment device 100 connected to the secondary side of the vacuum pump 20 to treat the odorous gas preferably has sufficient ventilation (treatment capacity) to maintain the pressure on the secondary side at approximately atmospheric pressure when the vacuum pump 20 used is discharging at normal capacity.

[0030] On the other hand, there is a limit to the space available for installing the treatment device 100, and in order to perform good treatment such as deodorization, the treatment chamber provided in the treatment device is provided with various narrow passages and other mechanisms for lengthening the residence time of odorous gases, which results in a decrease in the breathability of odorous gases inside the treatment chamber. For this reason, in a treatment device actually used for deodorization, while the vacuum pump 20 is capable of maintaining its secondary side at approximately atmospheric pressure while it is functioning steadily, if the pressure in the tank 21 rises for some reason and the exhaust volume of the vacuum pump 20 increases, the pressure on the secondary side may exceed atmospheric pressure.

[0031] When odorous gases are supplied to a treatment device such as that shown in Figure 1 at pressures exceeding atmospheric pressure, the inside of the treatment device becomes positive pressure, and the area around the burner also becomes positive pressure, causing the odorous gas to leak out through the path that is supposed to take in fresh air from outside, resulting in a problem of foul odors.

[0032] In order to solve the above problems, the inventors have conducted various studies and have found that by providing a path closing means capable of closing the communication between the treatment chamber and the atmosphere in an air supply path through which combustion air (hereinafter sometimes referred to as "fresh air") to be mixed with fuel gas and used for combustion is taken from the atmosphere and supplied to the treatment chamber, and by closing the fresh air introduction path, for example, while the vacuum pump is operating and odorous gas is being introduced into the treatment chamber, or when the inside of the treatment device becomes positive pressure due to odorous gas, etc., it is possible to prevent the outflow of odorous gas and suppress the generation of bad odors while deodorizing the odorous gas, thereby arriving at the present invention.

[0033] In other words, because combustible gases can be burned under a relatively wide range of conditions, and because the odorous gases generated when collecting excrement and urine contain oxygen at a ratio roughly equal to that of the atmosphere, it is possible to use the odorous gases as combustion gases for burning fuel gases such as LP gas. For this reason, it has been discovered that, depending on the operating state of the vacuum pump, it is possible to close the introduction path for fresh air for combustion to prevent the odorous gases from escaping, and then deodorize the odorous gases.

[0034] According to the present invention, it is possible to prevent the outflow of odorous gas when deodorizing odorous gas using combustible gas as fuel, and in particular, it is possible to perform deodorization and other processes while maintaining a positive pressure inside the treatment device.This makes it possible to achieve a high deodorizing effect by reducing the size of the treatment device and extending the flow path of the odorous gas inside the treatment device.

[0035] The present invention will be described in more detail below with reference to examples. Note that the examples shown below are merely illustrative of the present invention, and the present invention should not be understood as being limited to these examples. [Example]

[0036] Example 1 FIG. 3 shows a schematic diagram of a processing apparatus according to Example 1 of the present invention. FIG. 3(a) shows a longitudinal section of the processing apparatus, and FIG. 3(b) shows a transverse section of the processing apparatus. Note that FIG. 3 is a diagram that shows a schematic diagram of an example of a processing apparatus according to the present invention, and the cross-sectional views of each component shown in the drawing do not necessarily show the shape of a single cross section of the processing apparatus. The same applies to the schematic diagrams shown in the following other examples.

[0037] 3, a combustion chamber 118 including an orifice 120 for discharging a predetermined amount of fuel gas such as LP gas supplied from a fuel gas inlet 121 at a predetermined pressure is provided at the bottom of an odorous gas treatment chamber 110 whose upper part is open to the atmosphere. A combustion air inlet 123 is provided near the orifice 120 as a means for introducing a combustion gas such as fresh air in such a manner that the introduced fresh air can be easily mixed with the fuel gas and combustible, and an air supply path 119 is connected to the combustion air inlet 123 for communicating with the atmosphere.

[0038] 3, a manual on-off valve 122 is provided in the air supply path 119 as a path closing means capable of closing communication between the processing chamber and the atmosphere via the path. The structure of the on-off valve 122 is not particularly limited, and a ball valve, a butterfly valve, a gate valve, a globe valve, a needle valve, or the like can be used as appropriate.

[0039] When the opening and closing valves 122, 124 are open, fuel gas and fresh air are supplied to the combustion chamber 118 inside the treatment chamber 110 in a predetermined ratio to generate a mixed gas, and the mixed gas is ignited by applying voltage to the spark plug 116 using the high-voltage device 117 to generate a discharge, generating a combustion flame that can be released into the odorous gas treatment chamber 110.

[0040] Note that Figure 3 describes a form in which a combustion chamber 118 is provided inside the processing chamber 110 mainly for generating a combustion flame, but the present invention is not limited to this, and it is not necessary to provide individual combustion chambers 118 within the range in which a combustion flame can be supplied inside the processing chamber 110.By appropriately arranging orifices 120 inside the processing chamber 110 and providing combustion air inlets 123 that supply combustion gas to the fuel gas released from each orifice, the fuel gas and combustion gas can be mixed to supply a combustion flame.

[0041] Furthermore, Figure 3 describes a form in which a combustion flame is generated by so-called diffusion combustion, in which mixing and combustion occur simultaneously between the fuel gas released into the combustion chamber 118 and the combustion gas (oxygen) supplied from the surroundings, but the present invention is not limited to this, and a combustion flame can be supplied inside the processing chamber 110 using a burner in a form in which fuel gas mixed with combustion gas (oxygen) in a predetermined ratio is released from a nozzle and burned.

[0042] In this case, by using a so-called Bunsen burner-type nozzle that draws in and mixes combustion gas using the flux of fuel gas, it is possible to stabilize the intake of unpressurized combustion gas and improve the combustion temperature, etc.

[0043] In addition, by placing an appropriate diffusion plate 113 or the like inside the odorous gas treatment chamber 110, the diffusion plate 113 or the like is heated by the combustion flame, which helps to maintain the inside of the odorous gas treatment chamber 110 at a high temperature, and also extends the path along which the odorous gas introduced from the odorous gas inlet pipe 112 flows inside the odorous gas treatment chamber 110, thereby increasing the degree of mixing with the combustion flame and the degree of oxidative removal and decomposition of various components contained in the odorous gas.

[0044] Furthermore, when starting to treat odorous gases using the treatment device shown in Figure 3, the inside of the odorous gas treatment chamber 110 is heated to a predetermined temperature by combustion of fuel gas and fresh air before starting to introduce the odorous gas, thereby enabling the harmful components to be efficiently decomposed from the initial stage of introduction of the odorous gas.

[0045] In the treatment apparatus shown in Fig. 3, an odorous gas introduction path 112 having an annular portion is provided around the combustion chamber 118, and the odorous gas introduction pipe is connected to the secondary side of a vacuum pump to supply odorous gas into the odorous gas treatment chamber 110. In the odorous gas introduction path 112 shown in Fig. 3, a plurality of odorous gas outlets 114 and corresponding straightening plates 115 are provided at the top of the pipe, so that the odorous gas injected into the odorous gas treatment chamber 110 forms a vortex, and the path along which the odorous gas mixed with the combustion flame circulates inside the treatment chamber 110 is lengthened.

[0046] Furthermore, in addition to droplets of liquid or fine powder other than odorous gases originating from excrement and urine, oil components released from the vacuum pump are introduced into the odorous gas introduction path 112, and a phenomenon has been observed in which these adhere to the inside of the odorous gas introduction path, turn into tar, and accumulate. In order to prevent the accumulation of such tar-like substances, an appropriate mist trap can be provided in the odorous gas introduction path, or a means can be provided that can heat a predetermined location in the odorous gas introduction path to a predetermined temperature.

[0047] 3 can be used, for example, as follows: Before starting the vacuum pump to reduce the pressure inside the tank of the vacuum truck, it is preferable to open the on-off valve 122 of the air supply path and the on-off valve 124 of the fuel gas to mix the fuel gas with fresh air near the combustion chamber 118, and in this state, generate a combustion flame with a spark from the ignition plug 116 to heat the inside of the odorous gas treatment chamber 110 to a temperature suitable for deodorizing the odorous gas.

[0048] Thereafter, while the combustion flame is maintained, the vacuum pump is started to gradually reduce the pressure inside the tank of the vacuum truck, and the odorous gas exhausted from the secondary side of the vacuum pump is introduced into the odorous gas treatment chamber 110, thereby deodorizing the odorous gas. Furthermore, after the pressure inside the tank of the vacuum truck is reduced, when feces and urine are sucked into the tank through a suction hose connected to the tank and collected, the odorous gas introduced into the odorous gas treatment chamber 110 can be deodorized by maintaining the combustion flame.

[0049] As described above, in the process of using the treatment device shown in FIG. 3, while the odorous gas is being introduced into the odorous gas treatment chamber 110 by the operation of the vacuum pump, even if the opening / closing valve 122 of the air supply path is closed, the oxygen contained in the odorous gas can be used as combustion gas to cause combustion between the oxygen and the fuel gas supplied from the orifice 120, thereby maintaining a combustion flame.

[0050] Combustion can occur between the odorous gas and the fuel gas by so-called diffusion combustion, and combustion can occur within a range in which the fuel gas exceeds the lower limit of the flammable concentration. Therefore, for example, by installing the spark plug 116 used for ignition closer to the orifice 120 than the location where the odorous gas and the fuel gas are mixed, even when the open / close valve 122 of the air supply path is closed to stop the supply of fresh air, the combustion flame can be maintained by the combustion of the mixed gas of the odorous gas and the fuel gas, and it is also possible to re-ignite the combustion flame if it is lost for some reason.

[0051] In addition, the treatment device shown in Figure 3 can be used to perform normal pumping operations with the on-off valve 122 in the air supply path open, and can also be used by closing the on-off valve 122 when a large fluctuation in the secondary pressure of the vacuum pump is expected, such as when the amount of feces and urine to be pumped decreases and there is a high possibility that the pumping hose will suck in air. As described above, when the combustion gas combusted with the fuel gas is changed from fresh air to odorous gas by opening and closing the fresh air opening and closing valve 122, the amount of fuel gas supplied to maintain a good combustion flame can be appropriately changed depending on the characteristics of the odorous gas treatment chamber 110, etc.

[0052] Example 2 4 is a schematic diagram of a processing apparatus according to Example 2 of the present invention. The processing apparatus according to Example 2 differs from the processing apparatus according to Example 1 in that the open / close valve 122 provided in the air supply path is replaced with a check valve 125.

[0053] The check valve 125 has low flow resistance when the outside air is sucked into the combustion chamber 118 side and flows, but when gas tries to flow out from the combustion chamber 118 side, the flow resistance becomes high, and it essentially functions to close the air supply path and prevent gas from flowing out from the combustion chamber 118 side.

[0054] 4, by using a check valve 125 as a path closing means provided in the air supply path 119, a stable combustion flame is generated by the fresh air inside the combustion chamber 118 within the range where fresh air is drawn in through the air supply path to cause combustion, while if for some reason the amount of odorous gas supplied to the treatment chamber 110 increases and the pressure around the combustion chamber 118 rises, the check valve 125 closes the air supply path, preventing leakage of the odorous gas and starting combustion using the odorous gas as the combustion gas. Therefore, when using the treatment device, it is possible to easily prevent leakage of the odorous gas without paying particular attention to the operation of the backflow prevention means for preventing leakage of the odorous gas.

[0055] The check valve 125 can have any suitable structure within the scope of performing the above-mentioned functions, and for example, a float ball type, swing chuck type, lift chuck type, wafer chuck type, or noval type can be used.

[0056] Example 3 5 is a schematic diagram of a treatment apparatus according to Example 3 of the present invention. The treatment apparatus according to Example 3 is similar to the treatment apparatus according to Example 1, except that the opening / closing valve 122 provided in the air supply path is an electromagnetic valve that operates by an electric signal, and a pressure gauge 126 capable of detecting the pressure inside the odorous gas treatment chamber 110 is provided so that the opening / closing valve 122 operates according to a signal from the pressure gauge 126.

[0057] The leakage of odorous gas through the air supply path 119 occurs when the pressure inside the odorous gas treatment chamber 110, particularly near the combustion chamber 118, exceeds atmospheric pressure, and the amount of leakage increases as the pressure near the combustion chamber 118 increases.

[0058] Therefore, as shown in FIG. 5, by providing an opening / closing valve 122 that operates in response to the pressure detected by a pressure gauge 126 installed at an appropriate position inside the odorous gas treatment chamber 110 as a path closing means installed in the air supply path 119, the air supply path 119 can be closed when the pressure on the secondary side of the vacuum pump increases, thereby preventing leakage of the odorous gas.

[0059] 5 closes when the pressure detected by the pressure gauge 126 exceeds, for example, atmospheric pressure to prevent leakage of odorous gas, and opens again when the gas in the odorous gas treatment chamber 110 is discharged and the pressure drops to about atmospheric pressure, allowing fresh air to be supplied to the vicinity of the combustion chamber 118. The pressure threshold for closing the opening / closing valve 122 when the pressure rises and the pressure threshold for opening the opening / closing valve 122 when the pressure drops again can be determined appropriately depending on the degree of odorous gas leakage, etc.

[0060] As the on-off valve 122, mainly a ball valve or a butterfly valve, but also a gate valve, a globe valve, a needle valve, etc. can be appropriately used. Furthermore, as a signal for opening and closing the on-off valve 122, in addition to a signal generated by a pressure gauge provided inside the processing chamber 110, for example, the on-off valve 122, which is a solenoid valve, can be opened and closed using an appropriate signal depending on the purpose, such as the operating status of a vacuum pump.

[0061] Example 4 6 is a schematic diagram of a treatment apparatus according to Example 4 of the present invention. The treatment apparatus according to Example 4 differs from the treatment apparatus according to Example 1 in that, as an open / close valve provided in the fresh air introduction path, a path switching valve (three-way valve) 127 is used which can (a) connect the air supply path 119 to the atmosphere (fresh air) and (b) close the air supply path 119, as well as (c) connect the air supply path 119 to an odorous gas introduction path such as the odorous gas introduction pipe 112.

[0062] As explained above, in a state where odorous gas flows into the odorous gas treatment chamber 110 by operating the vacuum pump, fresh air is not necessarily required as the combustion gas for burning the fuel gas, and it is possible to generate a combustion flame using the odorous gas as the combustion gas. On the other hand, in the treatment apparatus according to Example 1, when the supply of fresh air is cut off by the on-off valve 122, the mixing form and mixing ratio of the combustion gas containing oxygen to the fuel gas change significantly, so that it is expected that the combustion flame will temporarily disappear depending on the configuration of the odorous gas treatment chamber 110, etc.

[0063] In response to this, as shown in FIG. 6, a path switching valve 127 is provided in the air supply path 119 as a path closing means capable of closing the communication between the treatment chamber and the atmosphere, and is capable of connecting the air supply path to either the atmosphere or the odorous gas introduction path. This ensures that the mixing position of the fuel gas and the combustion gas remains the same even when the combustion gas supplied to the combustion air inlet 123 of the combustion chamber 118 is switched between fresh air and odorous gas, thereby making it possible to suppress changes in the combustion flame caused by the switching.

[0064] The on-off valve 127 may be switched manually depending on the operating status of the vacuum pump, or may be switched automatically depending on the output of a pressure gauge for detecting the pressure inside the odorous gas treatment chamber 110 as shown in Fig. 5. It is also possible to switch the on-off valve 127 in conjunction with the operation of the vacuum pump so that the odorous gas is always used as fuel gas while the vacuum pump is operating.

[0065] As the above-mentioned path switching valve 127, an L-port type three-way valve having an L-shaped path provided in a ball-shaped member constituting a ball valve may be used, or two butterfly valves each communicating with the atmosphere and the odorous gas path may be configured so that one is open and the other is closed, and by operating (opening and closing) these simultaneously, a function similar to that of a three-way valve may be realized.

[0066] When the odorous gas is supplied to the combustion air inlet 123 of the combustion chamber 118 and used as combustion gas, it is preferable to provide an expansion chamber 128 with a predetermined capacity in the path of the odorous gas, in that this can level out short-period changes in the secondary pressure of the vacuum pump and stabilize the combustion flame near the combustion chamber 118.

[0067] Furthermore, according to the configuration shown in FIG. 6, the supply position of the combustion gas relative to the combustion chamber 118 can be kept constant regardless of whether the combustion gas is fresh air or odorous gas, so that the combustion flame can be stabilized even when a Bunsen burner-type nozzle that burns a premixed mixture of fuel gas and combustion gas is used. [Industrial Applicability]

[0068] According to the present invention, even when deodorizing an odorous gas using a combustible gas as fuel, leakage of the odorous gas to the outside of the treatment device is prevented, thereby enabling good deodorization of the odorous gas. [Explanation of symbols]

[0069] 20 Vacuum Pump 21 Tank 22 Reservoir 23 Sump hose 24 Suction tube 25 exhaust pipe 26 Feces and urine 100 Processing equipment 110 Odor gas treatment chamber (secondary combustion chamber) 112 Odor gas introduction route 113 Diffuser 114 Odor gas outlet 115 Rectifier plate 116 Spark plug 117 High-voltage equipment 118 Combustion chamber 119 Air supply path 120 orifice 121 Fuel gas inlet 122 Opening and closing valve (fresh air) 123 Combustion air inlet 124 On-off valve (fuel gas) 125 Check valve 126 Pressure Gauge 127 Path switching valve (three-way valve) 128 Expansion Room 130 Fresh Air 131 Flow of odorous gas 132 Fuel Gas

Claims

1. A treatment device having a treatment chamber for heating and treating odorous gases emitted from the secondary side of a vacuum pump during pumping work by a vacuum truck, The treatment chamber is provided with an odorous gas introduction path for introducing the odorous gas into the treatment chamber, a fuel gas supply path for supplying fuel gas for forming a combustion flame by combustion, an air supply path for supplying air from the atmosphere in a form that can be mixed with the fuel gas and combustible, and an ignition device for igniting the mixed gas containing the supplied fuel gas, The processing apparatus is characterized in that the air supply path has a path closing means capable of closing communication between the processing chamber and the atmosphere.

2. 2. The processing apparatus according to claim 1, wherein the path closing means is an on-off valve.

3. 3. The processing apparatus according to claim 2, wherein the processing apparatus has a pressure gauge for detecting the pressure in the processing chamber, and the opening / closing valve is closed when the measured value of the pressure gauge reaches a predetermined pressure or higher.

4. 2. The processing apparatus according to claim 1, wherein the path closing means is a check valve that closes the air supply path when gas is about to flow out of the processing chamber.

5. 2. The treatment apparatus according to claim 1, wherein the path closing means is a path switching valve that can connect the air supply path to either the atmosphere or an odorous gas introduction path.

6. A vacuum vehicle comprising the treatment device according to any one of claims 1 to 5.

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