JP7111777B2 - Hydrogen sulfide gas desulfurization equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a desulfurization apparatus, and more particularly to a desulfurization apparatus for removing hydrogen sulfide from gas generated from waste buried in a final disposal site.

Waste gypsum board, which is an industrial waste, is known to generate hydrogen sulfide under certain conditions when buried in the ground. The hydrogen sulfide generation mechanism is believed to be due to decomposition of calcium sulfate (CaSO ₄ ), which is the main component of gypsum, by microorganisms in soil. When the waste gypsum board is buried in the ground along with the protective paper and glue of the waste gypsum board and the organic matter such as wood chips that adhered when the building was dismantled, some microorganisms decompose this organic matter to produce organic acids such as acetic acid and oxygen. consume. As a result, when the ground becomes an anaerobic environment, the activity of sulfate-reducing bacteria, which are anaerobic microorganisms, increases, and sulfate ions (SO ₄ ^2- ) in calcium sulfate contained in waste gypsum boards are reduced in the presence of organic acids. to generate hydrogen sulfide gas (H ₂ S). Therefore, when the soil in which the waste gypsum board is reclaimed contains sulfate-reducing bacteria, sufficient organic matter, and maintains appropriate temperature, moisture, and anaerobic conditions, a high concentration of May form hydrogen sulfide.

Therefore, due to the revision of the law, since 2007, landfilling of waste gypsum boards has been regulated only at controlled final disposal sites. A controlled final disposal site should be constructed with seepage control work to prevent groundwater contamination by retained water containing pollutants generated from landfill waste, and a collection system for collecting retained water, etc. and sending it to treatment facilities. It is compulsory to install drain pipes and vent pipes to release gases generated from underground landfill waste into the atmosphere.

The gas released into the atmosphere from the gas vent pipe generally contains water vapor, carbon dioxide, methane gas, etc., but may also contain hydrogen sulfide when the waste gypsum board is landfilled as described above. Hydrogen sulfide not only causes bad odors, but is harmful to the human body at high concentrations.

Therefore, Patent Document 1 describes that a desulfurization device is installed in the gas vent pipe in order to remove hydrogen sulfide from the generated gas. The technique described in Patent Document 1 is to install a container containing a desulfurizing agent in the opening of the gas vent pipe on the ground surface side, and adsorb and remove hydrogen sulfide with the desulfurizing agent while the generated gas flows inside. is.

Japanese Patent Application Laid-Open No. 2003-210937

The desulfurizing agent housed in the desulfurization device may generate heat of reaction when reacting with hydrogen sulfide and reach a high temperature. When the desulfurization device is directly attached to the gas vent pipe as in Patent Document 1, the reaction heat between the hydrogen sulfide and the desulfurizing agent may deform or damage the plastic gas vent pipe. Therefore, it is considered unsuitable for high concentrations ranging from several hundred ppm to tens of thousands of ppm.

In addition, since the gas released from the gas vent pipe contains a large amount of water vapor, when the generated gas flows into the container of the desulfurization device, the water vapor comes into contact with the desulfurization agent, increasing the water content of the desulfurization agent. and may degrade the desulfurization performance.

Furthermore, since the desulfurization performance of the desulfurization agent decreases over time, it is necessary to replace the desulfurization agent at regular intervals, but Patent Document 1 does not describe means for exchanging the desulfurization agent.

The present invention prevents the heat of reaction between hydrogen sulfide gas and a desulfurizing agent from affecting gas vent pipes and devices even when the concentration of generated gas at a waste (landfill) treatment plant is high. To provide a desulfurization apparatus capable of suppressing contact between water vapor and a desulfurization agent and easily exchanging the desulfurization agent when necessary.

In order to achieve the above object, the invention according to claim 1 is a desulfurization device attached to a gas vent pipe that draws gas generated from waste buried underground to the surface of the earth, It is made of a material with corrosion resistance, and one end is connected to a gas vent pipe that is treated to prevent the generated gas from diffusing into the atmosphere. consisting of a gas-liquid separation pipe extending in the vertical direction, at least the upper part of which is open, and the other end of the horizontal pipe being connected to the middle part; and a desulfurizer arranged above the gas-liquid separation pipe, The desulfurizer consists of a cylindrical container that is made of a material that is resistant to corrosion and heat against hydrogen sulfide and that is open at both upper and lower ends in the vertical direction, and a desulfurizing agent that removes hydrogen sulfide from the generated gas contained in this container. is arranged so that the opening on the lower end side of the container faces the opening on the upper end side of the gas-liquid separation pipe, and the horizontal pipe, the gas-liquid separation pipe, and at least a part of the lower side of the desulfurizer are covered with soil It is what is done.

With this configuration, the gas generated from the underground waste is attracted by the gas vent pipe and reaches the ground surface, passes through the horizontal pipe and the gas-liquid separation pipe, and enters the desulfurizer. flow from Hydrogen sulfide contained in the generated gas is removed by the desulfurizing agent while the generated gas passes through the desulfurizer. The generated gas from which hydrogen sulfide has been removed is released into the atmosphere from above the desulfurizer. Since the lateral pipe, the gas-liquid separation pipe, and at least a portion of the lower side of the desulfurizer are covered with soil, they are cooled and hydrogen sulfide is prevented from flowing out to the ground surface.

According to the second aspect of the invention, in addition to the configuration of the first aspect of the invention, the desulfurizer further includes a lower adjustment layer formed of a foam material below the desulfurizing agent contained in the container.

With this configuration, at least a part of the lower side of the desulfurizer is buried in the soil, so that the temperature of the lower adjustment layer made of the foam material is kept lower than that of the generated gas, so that the generated gas passes through the layer. The water vapor inside is condensed and removed.

According to the invention of claim 3, in addition to the configuration of the invention of claim 1 or 2, the desulfurizer further includes an upper adjustment layer formed of a foam material above the desulfurizing agent contained in the container. .

With this configuration, the flow velocity of the generated gas can be controlled by adjusting the flow resistance of the gas according to the thickness and porosity of the upper adjustment layer.

The invention according to claim 4 is the structure of the invention according to any one of claims 1 to 3, wherein the gas-liquid separation pipe has a mesh-like or grid-like partition disposed at the opening on the upper end side. Further includes:

With this configuration, a mesh-like or lattice-like partition is arranged at the opening on the upper end side of the gas-liquid separation tube, so that gas and liquid can pass through, but solids larger than the mesh of the partition cannot pass through. be blocked.

According to a fifth aspect of the present invention, in the configuration of the fourth aspect of the invention, the partition body includes a metal net body having a resin-coated surface.

With this configuration, the surface of the wire mesh body is coated with resin, so that it has corrosion resistance.

According to a sixth aspect of the invention, in the configuration of any one of the first to fifth aspects of the invention, the lateral pipe is provided with a drainage gradient that is downwardly inclined toward the gas vent pipe. be.

With this configuration, the liquid in the lateral draw pipe flows toward the gas vent pipe.

According to a seventh aspect of the present invention, in any one of the first to sixth aspects of the invention, the container is a tubular body made of concrete.

With this configuration, the concrete container has heat resistance, corrosion resistance, weather resistance, and strength.

According to the first aspect of the invention, the horizontal pipe, the gas-liquid separation pipe, and the container of the desulfurizer are made of a material having corrosion resistance to hydrogen sulfide, so that the generated gas contains hydrogen sulfide. is also resistant to corrosion. Since the temperature of the lateral pipe is kept low by covering with soil, the generated gas flowing inside is cooled and condenses the contained water vapor. As a result, it is possible to reduce the amount of water vapor in the generated gas flowing into the desulfurizer, so that it is possible to prevent the desulfurizing agent from deteriorating in reactivity and lowering the efficiency of removing hydrogen sulfide. When water is generated by the reaction between hydrogen sulfide and the desulfurizing agent, this water (steam) is discharged to the outside from the openings on the upper and lower ends of the desulfurizer container, so the moisture content of the desulfurizing agent should be reduced. It is possible to prevent a decrease in reactivity. Since the container is made heat-resistant, the container is less likely to be damaged even when heat is generated due to the reaction between hydrogen sulfide and the desulfurizing agent. Since the heat is generated in the desulfurizer, the heat does not affect the gas vent pipe, the horizontal draw pipe, and the gas-liquid separation pipe. Since the installation of the desulfurizer vessel is by covering with soil, the vessel can be easily moved using a suitable heavy machine such as a backhoe. As a result, the desulfurizing agent stored in the container can be easily replaced.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, by passing through the lower adjustment layer, the humidity of the generated gas can be kept low, so that the reaction efficiency of the desulfurizing agent is prevented from decreasing. can be prevented.

According to the invention of claim 3, in addition to the effects of the invention of claim 1 or claim 2, since the flow velocity of the generated gas can be controlled by the upper adjustment layer, the time for the generated gas to pass through the container is It is possible to set the time necessary to ensure the removal of hydrogen sulfide so that the generated gas discharged from the desulfurizer does not contain hydrogen sulfide.

According to the invention of claim 4, in addition to the effect of the invention of any one of claims 1 to 3, the desulfurizing agent and the foaming material enter the gas-liquid separation pipe from the opening on the lower end side of the desulfurizer. It is possible to prevent the function of the desulfurizer from deteriorating by preventing it from falling.

According to the invention of claim 5, in addition to the effects of the invention of claim 4, it is possible to provide a partition that is resistant to corrosion by hydrogen sulfide over a long period of time.

According to the invention of claim 6, in addition to the effect of the invention of any one of claims 1 to 5, when the water vapor contained while the generated gas flows through the horizontal pipe is liquefied by condensation. , this liquid flows along the drainage gradient towards the vent pipe and is discharged. By preventing the liquid from remaining in the horizontal tube, an increase in the partial pressure of water vapor in the horizontal tube is suppressed, so that the water vapor can be efficiently condensed.

According to the invention of claim 7, in addition to the effect of the invention of any one of claims 1 to 6, the container is a concrete cylindrical body having heat resistance and corrosion resistance, Even if the desulfurizing agent becomes hot due to the reaction heat with hydrogen sulfide, the container will not be deformed or damaged. Also, it does not corrode easily even if it comes into contact with hydrogen sulfide. Since concrete has strength and excellent weather resistance, it can be installed outdoors for a long period of time.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows schematic structure of the desulfurization apparatus by the 1st Embodiment of this invention.

FIG. 1 is a cross-sectional view showing a schematic configuration of a desulfurization apparatus according to a first embodiment of the present invention. A desulfurization apparatus 10 of this embodiment is attached to a gas vent pipe 1 installed in a controlled final disposal site for industrial waste.

As shown in FIG. 1, the desulfurization apparatus 10 includes a horizontal draw pipe 11 having one end connected to the gas vent pipe 1 and extending in the horizontal direction, and a horizontal draw pipe 11 extending in the vertical direction and having at least an upper opening and an intermediate portion. and a desulfurizer 14 arranged above the gas-liquid separation pipe 12 .

The gas vent pipe 1 is installed vertically from the bottom of the final disposal site to the ground surface, and a perforated polyethylene pipe having a large number of openings 2 in the peripheral wall is used. By using the perforated pipe, the gas generated from the waste buried in the ground can be introduced into the gas vent pipe 1 through the opening 2 and guided to the surface of the earth. In addition, the lower end of the gas vent pipe 1 is often connected to a leachate collecting and draining pipe installed at the bottom of the final disposal site. It exhibits the function of quickly draining water to the collection and drainage pipe.

The gas vent pipe 1 to which the desulfurizer 10 is attached is closed with a cover 3 so as to be openable and closable, so that the gas generated from the gas vent pipe 1 is not directly diffused into the atmosphere. In addition, since the cover 3 can be opened and closed, the raw gas concentration in the gas vent pipe 1 can be inspected by opening the cover 3 periodically or as required.

The desulfurization device 10 can be attached to all the gas vent pipes installed in the final disposal site, but the gas vent pipe where hydrogen sulfide is detected in the generated gas, or the hydrogen sulfide concentration in the generated gas is The desulfurization device 10 may be attached by selecting a gas venting pipe with a predetermined value (for example, 100 ppm) or more.

The horizontal draw pipe 11 is made of a material such as polyethylene having corrosion resistance to hydrogen sulfide, and a non-porous pipe having no openings in the peripheral wall is used. By sufficiently increasing the length of the lateral pipe 11, the effect of cooling the generated gas flowing through the lateral pipe 11 and removing water vapor by condensation can be enhanced. By ensuring the separation between the gas vent pipe 1 and the desulfurizer 14 , the heat generated in the desulfurizer 14 can be prevented from affecting the gas vent pipe 1 . However, if the horizontal pipe 11 is too long, the generated gas may not be sufficiently drawn to the desulfurizer 14 . Therefore, when the pipe diameter of the transverse pipe 11 is, for example, 200 mm, it is desirable to set the length to about 4 to 10 m. Further, the horizontal draw pipe 11 may be installed horizontally, but it is desirable to set it so that it has a downward gradient toward the gas vent pipe 1 .

As the gas-liquid separation pipe 12, a T-shaped pipe made of a material such as polyethylene having corrosion resistance to hydrogen sulfide is used. When installed, the T-shaped horizontal stroke portion (first portion 12 a ) is arranged to extend in the vertical direction, and the T-shaped vertical stroke portion (second portion 12 b ) is connected to the horizontal draw pipe 11 . The first portion 12a has openings on the upper and lower sides in the vertical direction, and the opening on the upper end side is provided with a mesh-like or lattice-like partition 13. As shown in FIG. For the partitioning body 13, for example, a metal mesh whose surface is coated with a resin and whose mesh size is equal to or smaller than the particle diameter of the foaming material to be described later is used. In addition, if the strength of the metal net alone is insufficient, a net made of metal wires having a larger diameter may be used in combination.

The desulfurizer 14 includes a cylindrical container 15 installed so as to surround the partition 13, a desulfurizing agent layer 20 made of a desulfurizing agent contained in the container 15, and foams above and below the desulfurizing agent layer 20. It includes an upper adjustment layer 21 and a lower adjustment layer 22 made of material.

The container 15 is made of a material such as concrete having corrosion resistance and heat resistance to hydrogen sulfide, and is configured as a cylindrical body with openings at both upper and lower ends in the vertical direction, and for example, a Hume tube is used. The arrangement of the container 15 is set so that the opening on the lower end side faces the opening on the upper end side of the gas-liquid separation pipe 12 via the partition member 13 . A plate-like rain cover 16 is arranged at the opening of the upper end of the container 15 . The rain cover 16 is for preventing rainwater from flowing into the container 15 . However, between the rain cover 16 and the container 15, there is a gap that allows gas flow. Since the container is made of concrete, it will not be deformed or damaged by reaction heat, and will not easily corrode even if it comes into contact with hydrogen sulfide. Furthermore, since concrete has high strength and excellent weather resistance, it can be installed outdoors for a long period of time.

The desulfurizing agent removes hydrogen sulfide from the generated gas flowing through the container 15. For example, a metal compound containing iron oxide (FeO _{, Fe2O3} ) as a main component is shaped into granules or pellets. used. The amount of the desulfurizing agent contained in the container 15 is set so as to reliably remove hydrogen sulfide from the generated gas that flows. That is, the necessary amount is used to bring the hydrogen sulfide concentration to 0 ppm or less than the permissible value (for example, 10 ppm) when the gas component is inspected at the opening on the upper end side of the container 15 .

As the foam material for forming the upper adjustment layer 21 and the lower adjustment layer 22, for example, an inorganic porous material such as foam glass or natural pumice is used. The upper adjustment layer 21 is for adjusting the flow velocity of the circulating generated gas. The flow velocity of the generated gas depends on the amount of gas generated underground and the thickness of the desulfurizing agent or the like when passing through the device. Therefore, the amount of the foaming material that forms the upper adjustment layer 21 is determined by appropriately suppressing the flow rate of the generated gas flowing through the container 15 in consideration of the particle size of the foaming material, so that the contact time between the generated gas and the desulfurizing agent is It is set so that it is sufficiently secured. The upper adjustment layer 21 also has the function of preventing rainwater from coming into contact with the desulfurization agent in the unlikely event that rain falls into the container 15 .

The lower adjustment layer 22 is for contacting the generated gas to adjust the flow rate and remove water vapor. Therefore, the amount of the foaming material forming the lower adjustment layer 22 is set so that the contact time between the generated gas and the foaming material is sufficiently secured, and the foaming material can reliably exhibit the function of removing water vapor in the generated gas. .

The outline of the construction procedure of the desulfurization apparatus 10 is as follows. First, in the final disposal site 30 where waste is landfilled, the portion of the gas vent pipe 1 protruding from the ground surface 31 is closed by attaching the lid 3 to the opening at the upper end, and the horizontal draw pipe is closed. 11 is connected. Next, the second portion 12b of the gas-liquid separation pipe 12 is connected to the other end of the horizontal pipe 11. As shown in FIG. Also, the posture of the lateral draw pipe 11 is adjusted so that it slopes downward toward the gas vent pipe 1. - 特許庁In this state, the portion of the gas vent pipe 1 protruding from the ground surface 31 , the lateral pipe 11 and the gas-liquid separation pipe 12 are once covered with the covering soil 40 . At this time, it is desirable to expose the upper end of the gas vent pipe 1 or a part including the upper end on the cover soil 40 so that the lid 3 attached to the gas vent pipe 1 can be easily opened and closed. Subsequently, after disposing the partition 13 at the opening of the upper end of the gas-liquid separation pipe 12 , the container 15 of the desulfurizer 14 is placed on the cover soil 40 so as to surround the partition 13 . In order to prevent the outflow of generated gas from the lower end side of the container 15, the lower portion of the outer periphery of the container 15 is covered with soil. Subsequently, a foaming material is put into the container 15 to form the lower adjustment layer 22 . At this time, the foaming material is prevented from falling into the gas-liquid separation pipe 12 by the partition member 13 arranged at the opening on the upper end side of the gas-liquid separation pipe 12 . Next, a desulfurizing agent is added to form the desulfurizing agent layer 20 , and a foaming material is added to form the upper adjustment layer 21 . Finally, the rain cover 16 is placed on the upper opening of the container to complete the construction of the desulfurization device 10 .

In the desulfurization apparatus 10 configured as described above, a communication path is formed from the gas vent pipe 1 to the desulfurizer 14 via the horizontal draw pipe 11 and the gas-liquid separation pipe 12 . At least a portion of the lower side of the container 15 in the lateral pipe 11, the gas-liquid separation pipe 12, and the desulfurizer 14 is covered with soil, so that these are maintained in a state of being constantly cooled by the soil. Therefore, generated gas generated from underground waste and drawn to the surface of the earth through the gas vent pipe 1 is cooled while it is guided to the gas-liquid separation pipe 12 via the lateral pipe 11 . As a result, the water vapor contained in the generated gas is condensed and removed. Therefore, the generated gas supplied from the gas-liquid separation pipe 12 to the desulfurizer 14 has a low humidity. Further, the liquid produced by the condensation of water vapor in the lateral draw pipe 11 flows according to the drainage gradient given to the lateral draw pipe 11 and is discharged into the gas vent pipe 1 .

The generated gas that has flowed into the desulfurizer 14 from the gas-liquid separation pipe 12 comes into contact with the cooled foaming material while passing through the lower conditioning layer 22, where water vapor is also removed by condensation. While the generated gas whose humidity is further reduced in this way passes through the desulfurizing agent layer 20, hydrogen sulfide in the generated gas is removed by reaction with the desulfurizing agent. It is generally known that desulfurizing agents mainly composed of iron compounds become less reactive when the water content increases. Suppressed. The generated gas from which hydrogen sulfide has been removed by contact with the desulfurizing agent passes through the upper adjustment layer 21 and is then released to the outside air through the opening at the upper end of the container 15 . By providing the upper adjustment layer 21, the flow rate when the generated gas passes through the desulfurization agent layer 20 is controlled to ensure the contact time with the desulfurization agent, so hydrogen sulfide can be reliably removed from the generated gas. can be done. As a result, the generated gas discharged from the desulfurizer 14 can have a hydrogen sulfide concentration of 0 ppm or less than the permissible value, so that there is no risk of adversely affecting the surrounding environment.

When the main component of the desulfurizing agent is iron (III) oxide, the reaction formula is as follows.
_{Fe2O3 + 3H2O + 3H2S} → _{Fe2S3 +} 6H2O
As a result of the desulfurization reaction, the water produced in the desulfurization agent layer 20 and the water removed from the generated gas in the lower adjustment layer 22 flow out from the vessel 15 into the gas-liquid separation pipe 12 . That is, the water generated in the container 15 is quickly discharged to the outside from the opening on the lower end side of the container 15, so that the moisture content of the desulfurizing agent is suppressed from increasing, and the desulfurization reaction is prevented from decreasing. can. Water flows out from the lower end of the first portion 12 a of the gas-liquid separation pipe 12 and is absorbed by the soil of the final disposal site 30 .

Although the desulfurization reaction generates heat, the container 15 is not deformed or damaged because the container 15 is made of a heat-resistant material such as concrete. Moreover, since the heat is generated in the container 15 of the desulfurizer 14, the gas vent pipe 1, the horizontal draw pipe 11, and the gas-liquid separation pipe 12 are not affected by the heat.

As the desulfurization reaction with hydrogen sulfide in the generated gas progresses, iron oxide, which is the main component of the desulfurization agent, is replaced with iron sulfide, so the desulfurization performance deteriorates over time. Therefore, at regular intervals, or when the hydrogen sulfide concentration on the upper end side of the desulfurizer 14 container 15 exceeds the allowable value (for example, 10 ppm outside the container, 70 to 100 ppm at the upper end part inside the container), the desulfurizing agent is added. need to be replaced. To replace the desulfurizing agent, the container 15 is lifted and moved by suitable means such as heavy machinery, and the desulfurizing agent and foaming material remaining on the covering soil 40 are removed. Materials and desulfurization agents should be added. Since the container 15 is simply placed on the covering soil 40, it can be easily moved using a suitable heavy machine (eg, a backhoe, etc.), so that the desulfurizing agent can be easily replaced.

Moreover, the partition body 13 may be made of resin-coated wire mesh, or may be made of plastic or ceramic.

The upper adjustment layer may be omitted depending on the components of the generated gas, particularly the amount of water vapor and the flow rate of the generated gas.

The rain cover may be composed of a single plate-like body such as a slate plate, or may be used by partially overlapping a plurality of plate-like bodies. In this case, it becomes easier to secure a gap for ventilation between the container and the rain cover.

A desulfurization device 10 having the following configuration is attached to a gas venting pipe 1 installed in a controlled final disposal site. A non-perforated polyethylene pipe having a diameter of 200 mm and a length of 5 m was used as the horizontal pipe 11 . The drainage gradient of the horizontal pipe 1 was set to 2 to 4%. A polyethylene T-shaped tube with a diameter of 200 mm was used as the gas-liquid separation tube 12 . The partition 13 arranged on the upper end side of the gas-liquid separation pipe 12 includes a first wire mesh coated with a resin whose meshes are sufficiently smaller than the particle diameter of the foam material, and a wire rod having a diameter larger than that of the first wire mesh. A relatively large-mesh wire mesh consisting of The desulfurizer 14 uses a fume tube with a diameter of 600 mm and a length of about 1 m as the container 15, into which about 80 liters of foaming material is put, and then about 80 liters of a desulfurizing agent mainly composed of iron oxide is placed on it. 120 kg was put in, then about 40 liters of the foaming material was put in, and finally the opening on the upper end side of the container 15 was covered with the rain cover 16 . Natural pumice or vitreous foam “Supersol” (sold by Vitreous Foam Business Cooperative Association) is used as the foaming material, and “Nionon” (stock (manufactured by Tadashi Ibuki) was used. A slate plate was used as a rain cover.

According to the desulfurization apparatus 10 constructed in this way, when the generated gas having a hydrogen sulfide concentration of several tens to 70000 ppm in the gas vent pipe 1 is released into the atmosphere from the desulfurizer 14, the hydrogen sulfide concentration is substantially We were able to reduce it to 0 ppm.

As a result of continuous use of the desulfurization apparatus 10, hydrogen sulfide at a concentration exceeding the permissible value (10 ppm outside the container, 70 to 100 ppm at the upper end of the container) is detected in the generated gas released to the outside air. Therefore, the desulfurization agent was replaced. For the replacement work, a backhoe was prepared as a heavy machine for moving the container (Hume tube), and a belt sling was prepared for connection with the backhoe. The outline of the replacement work procedure is as follows. First, after removing the rain cover 16 from the upper end of the Hume tube, which is the container 15, the Hume tube was fitted with a belt sling. Next, after removing the cover around the Hume pipe with the bucket of the backhoe, the belt sling is engaged with the arm hook of the backhoe, the arm of the backhoe is operated, and the Hume pipe is lifted through the belt sling and moved to the side. let me Subsequently, the bucket of the backhoe is operated to remove most of the desulfurizing agent and foaming material remaining on the covering soil, and then the operator removes the remaining desulfurizing agent and foaming material using a scoop or the like, and the gas-liquid separation pipe 12 is removed. The upper end was exposed. Subsequently, after placing a partition 13 made of a wire mesh on the upper end side of the gas-liquid separation pipe 12 and adjusting the position, the backhoe is operated again to lift the Hume pipe, and the Hume pipe is placed in a position surrounding the partition 13. unloaded. Then, after preventing leakage of generated gas by applying a mound of about 50 cm to the lower part of the outer periphery of the Hume pipe, a foaming material and a desulfurizing agent were put into the Hume pipe, and a rain cover 16 was placed on the upper end of the Hume pipe to complete the replacement work. .

REFERENCE SIGNS LIST 1 gas vent pipe 2 opening 3 lid 10 desulfurization device 11 horizontal pipe 12 gas-liquid separation pipe 13 partition 14 desulfurizer 15 container 16 rain cover 20 desulfurization agent layer 21 top Adjustment layer 22 Lower adjustment layer 30 Final disposal site 31 Ground surface 40 Covering soil In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (7)

A desulfurization device attached to a gas venting pipe that draws gas generated from waste buried underground to the surface of the earth,
a laterally extending pipe having one end connected to the gas vent pipe which is made of a material having corrosion resistance to hydrogen sulfide and is treated so as not to diffuse the generated gas into the atmosphere;
a gas-liquid separation pipe made of a material having corrosion resistance to hydrogen sulfide, extending in the vertical direction, being open at least at the top, and having the other end of the horizontal pipe connected to an intermediate portion thereof;
A desulfurizer disposed above the gas-liquid separation pipe,
The desulfurizer includes a cylindrical container made of a material having corrosion resistance and heat resistance to hydrogen sulfide and having both upper and lower ends in the vertical direction, and a desulfurizing agent contained in the container for removing hydrogen sulfide from the generated gas. and is arranged so that the opening on the lower end side of the container faces the opening on the upper end side of the gas-liquid separation tube,
A desulfurization apparatus, wherein at least a portion of the lower side of the horizontal pipe, the gas-liquid separation pipe, and the desulfurizer is covered with soil. 2. The desulfurization apparatus according to claim 1, wherein said desulfurizer further includes a lower adjustment layer formed of a foam material under said desulfurizer contained in said container. 3. The desulfurization apparatus according to claim 1, wherein said desulfurizer further includes an upper adjustment layer formed of a foam material above said desulfurizing agent contained in said container. 4. The desulfurization apparatus according to any one of claims 1 to 3, wherein said gas-liquid separation pipe further includes a mesh-like or lattice-like partition disposed at an upper end side opening. 5. The desulfurization apparatus according to claim 4, wherein said partition includes a metal mesh having a resin-coated surface. 6. The desulfurization apparatus according to any one of claims 1 to 5, wherein the lateral pipe is provided with a drainage gradient that is downwardly inclined toward the gas vent pipe. 7. The desulfurization apparatus according to any one of claims 1 to 6, wherein said container is a tubular body made of concrete.

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