JP2002066246A - Digestion gas purifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digestion gas purifier which can efficiently remove siloxane compounds in digestion gas at a low cost. SOLUTION: This digestion gas purifier adsorbs and removes the siloxane compounds by making sewage sludge digestion gas containing the siloxane compounds pass through. The digestion gas purifier is provided with a plurality of packed beds (11a, 11b) which are installed in parallel and in which a porous adsorbent for adsorbing the siloxane compounds is packed, switch valves (12a, 12b) for switching the flowing gas of the sewage sludge digestion gas to introduce the gas to each of the packed beds, and digestion gas purge pipes (15a, 15b, 15c, 15d) connected to the packed beds, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for purifying a digestion gas containing a siloxane compound generated in a digestion process of sewage sludge.

[0002]

2. Description of the Related Art In recent years, reduction of CO ₂ has been promoted as one of the measures against global warming. For example, in a sewage treatment plant, power generation facilities are installed and self-supplied / purchased, thereby improving energy efficiency. Increasingly, there is an increasing number of cases of achieving efficient use and reducing CO ₂ emissions.

That is, in a sewage treatment facility, accumulated sewage is concentrated to obtain sludge containing various organic substances, which are anaerobically digested by the action of microorganisms. The mainstream is a system in which combustible gas (digestion gas) mainly composed of methane obtained in this process is supplied to power generation equipment such as a gas engine and a gas turbine to obtain electric power.

[0004] However, with the increase in the diffusion rate of sewers and changes in lifestyles, consumption of hair finishing agents such as shampoos and rinses, and water repellents such as car wax increases.
A large amount of siloxane compounds contained therein have flowed down into sewage.

[0005] The siloxane compound refers to a compound having a chain or cyclic structure having a siloxane bond (Si-O-Si) as a basic skeleton. As the chain compound, for example,
Examples include methoxytrimethylsilane, dimethoxydimethylsilane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, and dodecamethylpentasiloxane, and examples of the cyclic compound include hexamethylcyclotrisiloxane (D3
Isomer), octamethylcyclotetrasiloxane (D4
Isomer), decamethylcyclopentasiloxane (D5 isomer),
And dodecamethylcyclohexasiloxane (D6 form)
And the like. The compounds listed here have a functional group in the compound composed of a methyl group, but a compound substituted with a hydrocarbon group similar to a methyl group or a compound substituted with fluorine, chlorine, or the like instead of hydrogen is also included. In addition, there is a polypolymer compound having a large molecular weight.

The siloxane compound is present in the sewage in a form adsorbed on the sludge because most of the siloxane compound is insoluble in water, but volatilizes to the digestion gas side in a subsequent digestion process.
That is, the siloxane compound was present together with methane, which is a fuel gas for power generation, and flowed into the subsequent gas engine. The siloxane compound flowing into the gas engine becomes silica (SiO ₂ ) in a combustion chamber in the engine and adheres and precipitates on a cylinder head and other parts in the engine. As a result, there has been a problem that the engine is worn or deteriorated.

[0007] Further, the engine exhaust gas which has passed through a power generation facility such as a gas engine is subjected to, for example, nitrogen oxide treatment.
The waste gas is introduced into the denitration catalyst tower and treated. Since silica (SiO ₂ ) is contained in the exhaust gas, powdery silica (SiO ₂ ) in the exhaust gas precipitates on the surface of the catalyst. Since the powdery silica covers the surface of the catalyst in this way, and a part of the silica penetrates into the inside of the catalyst, there has been a problem that the catalytic activity is deteriorated and the desired removal of nitrogen oxides cannot be achieved.

Conventionally, without implementing effective means for directly avoiding the problems caused by the above-mentioned siloxane compounds, it is necessary to separately increase the frequency of maintenance and inspection of the engine and the frequency of replacement of the denitration catalyst. That is the current situation.

[0009]

As described above, a digestion gas containing a siloxane compound generated from a digestion process in a sewage treatment plant converts silica (SiO ₂ ) in the engine during a combustion process in a subsequent gas engine. This causes wear and deterioration of each part of the engine. Further, even in the latter stage of the denitration catalyst, there was a problem that silica (SiO ₂ ) covered the catalyst surface and deteriorated the denitration performance.

On the other hand, exhaust gas and air-conditioning exhaust gas from various factories, such as printing factories that handle organic solvents and organic silicon, also contain siloxane compounds. In order to remove such siloxane compounds, combustion means, solvent absorption methods, and the like are used. And so on. However, since the siloxane compound has a low concentration, it is difficult to completely burn it, and it cannot be sufficiently removed by means of burning. On the other hand, in the solvent absorption method, a solvent for absorbing the siloxane compound is separately required, and the treatment of the absorbed solvent is complicated, resulting in a problem that the cost is enormous.

An object of the present invention is to provide an apparatus for purifying digested gas capable of efficiently and inexpensively removing siloxane compounds from sewage sludge digested gas.

[0012]

In order to solve the above-mentioned problems, the present invention relates to a digestion gas purifying apparatus for adsorbing and removing the siloxane compound by passing a sewage sludge digestion gas containing the siloxane compound. A plurality of packed beds filled with a porous adsorbent that adsorbs the siloxane compound, and a plurality of packed beds arranged in parallel, for switching the passage of the sewage sludge digestion gas introduced into each of the plurality of packed beds. An apparatus for purifying digested gas, comprising: a switching valve; and a digestive gas purge pipe connected to each of the plurality of packed beds.

As described above, in the digestion gas purification apparatus of the present invention, the siloxane compound in the digestion gas is adsorbed and removed by flowing the digestion gas through the packed bed filled with the porous adsorbent. No silica (SiO ₂ ) derived from a siloxane compound is deposited in power generation equipment such as a gas engine and denitration equipment. For this reason, it is possible to avoid abrasion and deterioration of the engine parts as in the related art. Further, the problem of deterioration of the denitration catalyst tower catalyst can be avoided beforehand because the siloxane compound in the gas has been removed. As a result, the frequency of maintenance and inspection of the gas engine and the frequency of replacement of the catalyst in the denitration catalyst tower can be significantly reduced.

Moreover, in the digestion gas purification apparatus of the present invention, a plurality of packed beds are arranged in parallel, and a switching valve capable of switching gas passing to an arbitrary packed bed;
A digestion gas purge tube connected to each packed bed is provided. For this reason, by the switching operation of the switching valve and the purging operation of the packed bed, it is possible to perform the purging operation by stopping the gas passing through the specific packed bed as needed. Therefore, it is possible to perform a maintenance and inspection operation such as replacing the porous filler, which is a packing material of the packed bed, and thus it is possible to continuously operate the digestion gas purification process for a long period of time.

The digestion gas purifying apparatus of the present invention preferably further comprises a regenerating apparatus for regenerating the porous adsorbent having the siloxane compound adsorbed thereon.

When a regenerating device for the porous adsorbent is provided, it is possible to take out the used porous adsorbent at the time of maintenance and inspection and to regenerate the used porous adsorbent during maintenance and inspection. Therefore, the porous adsorbent can be used repeatedly, and can be used effectively.

The digestion gas purifying apparatus of the present invention further comprises a regeneration gas for generating a regeneration gas for regenerating the porous adsorbent by desorbing the siloxane compound from the porous adsorbent having the siloxane compound adsorbed thereon. A generator, a regeneration gas pipe provided with a switching valve for switching the regeneration gas introduced into each of the plurality of packed beds, and a recovery device for recovering the siloxane compound desorbed from the porous adsorbent It is preferable to further include

As described above, by connecting the means for regenerating the porous filler to the packed bed, the regenerating process of the porous adsorbent can be performed only by a simple operation such as a switching operation of a switching valve. It is possible to simultaneously perform the gas passing through the specific packed bed and the regeneration processing of the specific packed bed. As a result, effective use of the porous adsorbent can be achieved, and at the same time,
The process can be continuously operated for a long period of time without performing a mechanical operation of replacing the porous adsorbent.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

FIG. 1 is a flowchart showing an example of a sewage sludge digestion gas power generation system to which the present invention is applied. In addition,
In FIG. 1, details of the peripheral device are omitted.

The sewage collected at the sewage treatment plant is subjected to concentration and other treatments, and the sludge containing various organic substances obtained here is subjected to a digestion gas generator (eg, an egg-type digester, etc.) by the action of microorganisms. Anaerobic digestion. The combustible gas (digestion gas) mainly composed of methane obtained in this process,
After being subjected to desulfurization treatment, mist removal treatment and the like, it is stored in the digestion gas tank 1.

The digestion gas stored in the digestion gas tank 1 contains a siloxane compound derived from sewage, for example, 10 to 20.
It is contained at a concentration of 0 mg / m ³ . The siloxane compound contained here means a siloxane bond (Si—O—S
A compound having a linear or cyclic structure having i) as a basic skeleton. Examples of the chain compound include methoxytrimethylsilane, dimethoxydimethylsilane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, and dodecamethylpentasiloxane, and examples of the cyclic compound include hexamethylcyclotrisiloxane. Siloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6). The functional group in the siloxane compound does not need to be composed of a methyl group, and may be substituted with a hydrocarbon group similar to a methyl group. Alternatively, a siloxane compound substituted by fluorine, chlorine, or the like instead of hydrogen is included, and a polypolymer compound having a large molecular weight is also included.

The digestion gas stored in the digestion gas tank 1 is introduced into the digestion gas purification apparatus 2 of the present invention comprising a plurality of packed layers filled with a porous adsorbent, and the siloxane compound in the digestion gas is removed. Adsorbed and removed.

The digestion gas purified by passing through the digestion gas purification device 2 is introduced into the communicating gas engine 3. Note that the gas engine 3 is an example of a power generation facility, and may be another power generation facility such as a gas turbine or a combustion boiler.

Exhaust gas that has undergone a combustion process in the gas engine 3 is introduced into a denitration catalyst tower 4 where nitrogen compounds in the exhaust gas are removed and then released to the atmosphere via a chimney (not shown). The denitration catalyst tower 4 is usually installed at the subsequent stage of the power generation equipment, but may be omitted when the concentration of nitrogen oxides is low due to lean combustion or other measures. The material of the catalyst to be filled is not particularly limited as long as it is a catalyst used for denitration, and for example, a honeycomb shape or the like can be used.

In FIG. 1, the digestion gas purifying apparatus 2 is installed immediately before the gas engine 3 which is a power generation facility, but is not limited to this. The digestive gas purifying apparatus 2 of the present invention can be installed at an arbitrary position on the upstream side of the power generation facility. Further, a booster (gas compressor) and a dehumidifier (cooler, drain separator, mist separator, etc.) (not shown) may be provided at any location on the upstream side of the gas engine 3 and can be appropriately installed.

FIG. 5 shows a configuration of a conventional sewage sludge digestion gas power generation system. As shown in the figure, in a conventional sewage sludge digestion gas power generation system, digestion gas is directly introduced from a digestion gas tank 1 to a gas engine 3. For this reason, the inconvenience caused by the siloxane compound contained in the digestion gas as described above cannot be avoided.

Next, the digestion gas purifying apparatus of the present invention will be described in detail with reference to FIG.

The digestion gas from the digestion gas tank (see FIG. 1) is transported by a digestion gas pipe 14, which is divided into digestion gas pipes 14a and 14b. The digestion gas pipes 14a and 14b are provided with switching valves 12a and 12b, respectively, for switching the flow of the digestion gas. Each of the digestion gas pipes is connected to a packed layer 11a and 11b filled with a porous adsorbent. Is done.

Digestion gas pipes 14c and 14d provided with switching valves 12c and 12d are connected to the digestion gas discharge sides of the packed beds 11a and 11b, respectively, and the two digestion gas pipes 14c and 14d are merged. ,
It is connected to a gas engine 3 (see FIG. 1).

A digestion gas purge pipe 15a for supplying a purge gas and a digestion gas purge pipe 15c for extracting a purged digestion gas are connected to the packed bed 11a. A digestion gas purge pipe 15b for supplying and a digestion gas purge pipe 15d for extracting purged digestion gas are connected. Digestion gas purge tubes 15a and 15b
Are connected to a nitrogen gas supply device 16 for generating nitrogen gas as a purge gas, and are connected to digestion gas purge tubes 15c and 15c.
5d is a post-processing device 17 for collecting the purged digested gas.
Connected to. In addition, each digestion gas purge pipe 15a, 15
b, 15c and 15d have switching valves 13a, 13
b, 13c and 13d are provided respectively.

The packed beds 11a and 11b used in the digestion gas purifying apparatus of the present invention may be of a closed type which can be filled with a porous adsorbent and can flow a gas to be treated. Is not particularly limited. The superficial velocity of the digestion gas introduced into the packed beds 11a and 11b also depends on the filling amount of the porous adsorbent, but in order to obtain a sufficient contact efficiency between the gas and the adsorbent, for example, 0.5 m
/ S or less.

As the porous adsorbent filled in the filling layers 11a and 11b, for example, a specific surface area of 500
It is preferable that the pores have a pore distribution such that the integrated capacity of pores having a pore diameter of at least m ² / g and / or in the range of 10 ° to 20 ° is at least 0.1 cm ³ / g, but any properties similar thereto are preferred. I just need. The material of the porous filler is not particularly limited, and for example, activated carbon, zeolite, alumina, molecular sieves, and other materials can be used.

Using the digestion gas purification apparatus having such a configuration, digestion gas is processed, for example, as follows.

The digestion gas derived from the digestion gas tank 1 (see FIG. 1) is introduced into the packed bed 11a through the digestion gas pipes 14 and 14a. At this time, since the digestion gas switching valves 12a and 12c are open and 12b and 12d are closed, the digestion gas is introduced only into the packed bed 11a. In the process of the digestion gas passing through the packed bed 11a, the siloxane compound contained in this gas is adsorbed by the porous adsorbent and removed. The digestion gas from which the siloxane compound has been adsorbed and removed is introduced into the gas engine 3 (see FIG. 1) via the digestion gas pipes 14c and 14.

On the other hand, since the switching valves 12b and 12d are closed, the digestion gas does not flow through the packed bed 11b while the digested gas is being introduced into the packed bed 11a. An inspection is made.

Prior to the operation, among the switching valves provided in the digestion gas purge pipe, 13b and 13d are opened and 13a and 13c are closed. Nitrogen gas is introduced from the nitrogen gas supply device 16 into the packed bed 11b via the digested gas purge pipe 15b, and the combustible digestive gas in the packed bed 11b is expelled by the nitrogen gas and purged. The purged digestion gas is introduced into the post-processing device 17 via the digestion gas purge pipe 15d and the switching valve 13d.

As the post-processing device 17, any device can be used as long as it can process a small amount of digested gas that has been purged. Alternatively, the purged digestion gas may be combined with the digestion gas pipe 14 without being introduced into the post-processing device 17.

After purging the digestion gas in the packed bed 11b in this way, the entire porous adsorbent as the packed material is extracted from an inspection port (not shown) provided at the lower part of the packed bed 11b. The maintenance of the packed bed 11b is performed.
The taken out porous adsorbent is discarded or separately regenerated, and the packed bed 11b after the maintenance and inspection is newly filled with the porous adsorbent.

When a predetermined breakthrough time of the porous adsorbent filled in the packed bed 11a has been reached, the switching valve 12
The gas is passed through the packed bed 11b by operating a to 12d, and the packed bed 11a blocks digestive gas. Further, by operating the switching valves 13a to 13d, in the same manner as described above,
A maintenance check of the packed bed 11a is performed.

In this way, the passage of the digestive gas and the maintenance and inspection are alternately repeated in the two packed beds 11a and 11b.

In the digestion gas purification apparatus of the present invention, the siloxane compound in the digestion gas is adsorbed and removed by flowing the digestion gas through the packed bed filled with the porous adsorbent. (SiO ₂ ) derived from siloxane compound in power generation equipment and denitration equipment
Does not precipitate. For this reason, it is possible to avoid abrasion and deterioration of the engine parts as in the related art. further,
The problem of deterioration of the denitration catalyst tower catalyst can be avoided beforehand because the siloxane compound in the gas has been removed. As a result, the frequency of maintenance and inspection of the gas engine and the frequency of replacement of the catalyst in the denitration catalyst tower can be significantly reduced.

Moreover, in the digestion gas purification apparatus of the present invention, a plurality of packed beds are arranged in parallel, and a switching valve capable of switching gas passing to an arbitrary packed bed;
A digestion gas purge tube connected to each packed bed is provided. For this reason, by the switching operation of the switching valve and the purging operation of the packed bed, it is possible to perform the purging operation by stopping the gas passing through the specific packed bed as needed. Therefore, it is possible to perform a maintenance and inspection operation such as replacing the porous filler, which is a packing material of the packed bed, and thus it is possible to continuously operate the digestion gas purification process for a long period of time.

Next, a regenerating apparatus for regenerating a porous adsorbent having adsorbed a siloxane compound will be described.

FIG. 3 is a schematic diagram showing the configuration of a porous filler regenerating apparatus. The illustrated regenerating apparatus is installed separately from the packed bed 11 of the digestion gas purifying apparatus shown in FIG.

The used porous adsorbent extracted from the packed bed at the time of maintenance and inspection is stored in the regeneration tower 22. A regeneration gas such as water vapor or hot air is introduced into the regeneration tower 22 from the regeneration gas generator 20 via the regeneration gas 18, and the used adsorbent in the regeneration tower 22 is heated. Thereby, the siloxane compound adsorbed on the porous adsorbent is desorbed and discharged, and the porous adsorbent is regenerated.

The siloxane compound desorbed from the porous adsorbent is introduced into the siloxane compound recovery device 22 via the subsequent regeneration gas pipe 18 and recovered. Collection device 21
Can be, for example, an apparatus containing an organic solvent for recovering a siloxane compound. The porous adsorbent regenerated by desorbing the siloxane compound is refilled in a predetermined packed layer 11, and is repeatedly used for adsorption removal of the siloxane compound in the digested gas.

As described above, the provision of the regenerating device for the porous adsorbent makes it possible to stop the passage of gas and regenerate the used porous adsorbent taken out of the packed bed during maintenance and inspection. As a result, the porous adsorbent can be used repeatedly, and the advantage that the porous adsorbent can be effectively used is obtained.

FIG. 4 is a schematic diagram showing the configuration of another example of the digestion gas purifying apparatus according to the present invention.

In the digestion gas purification apparatus shown in FIG.
A set of the porous adsorbent regenerating device as described above is connected to the plurality of packed layers 11. Further, in the illustrated apparatus, the apparatus configuration related to digestion gas purging shown in FIG. 2 is omitted for simplification, but purification of digestion gas and digestion gas purging are performed by the procedure described with reference to FIG. Then, for example, the regeneration treatment of the porous adsorbent is performed according to the following procedure.

The packed bed 11b, which has reached the predetermined absorption breakthrough and has stopped passing gas, is provided with a regeneration gas generator 20
Via the switching valve 19b and the regeneration gas pipe 18b,
A regeneration gas such as steam or hot air is introduced. The porous adsorbent in the packed layer 11b to which the siloxane compound has been adsorbed desorbs the siloxane compound by being heated by the regeneration gas. The desorbed siloxane compound is introduced into the siloxane compound recovery device 21 via the regeneration gas pipe 18d and the switching valve 19d and recovered. Thus, the regeneration processing of the porous adsorbent filled in the filling layer 11b is completed.

When the porous adsorbent filled in the packed bed 11a has reached a predetermined breakthrough, the switching valves 19b and 19d are closed, and the switching valves 19a and 19c are opened.
Reproduction processing is performed in the same manner as described above. In this manner, the passage of the digestive gas and the regeneration of the porous filler can be alternately repeated in the packed layers 11b and 11a.

In the digestion gas purifying apparatus shown in FIG. 4, since the regenerating apparatus is connected to the packed beds 11a and 11b, the gas passing operation of the specific packed bed can be performed by a simple operation such as switching the switching valve. And the regeneration process of the remaining packed layers can be performed simultaneously. Therefore, the porous adsorbent can be effectively used, and at the same time, the digestion gas purification process can be continuously operated for a long time without performing the mechanical operation of replacing the porous adsorbent.

As described with reference to FIGS. 3 and 4,
The regeneration treatment of the used porous filler can be performed in the regeneration tower 22 or the packed bed 11. As a regeneration method, a thermal swing method using a gas for regeneration is used. Alternatively, a method in which heating means is provided in the regeneration tower 22 or the packed bed 11 to circulate air may be used. Alternatively, the same effect can be obtained by employing a pressure swing method in which the pressure inside the container is reduced to desorb the adsorbate (siloxane compound). Furthermore, it is also possible to use these methods in combination.

As described above, the present invention has been described by taking as an example a digestion gas purifying apparatus provided with two packed beds, but the packed bed may be a plurality of packed beds, and the present invention is not limited to this. For example, in the case of three series, it is possible to configure so that gas is passed through two series and the remaining one series is stopped, and various changes are possible.

As shown in FIGS. 2 and 4, various switching valves provided in each pipe of the digestion gas purification apparatus of the present invention may be provided in each pipe, or a three-way valve or the like may be provided in a branch portion. May be installed. The valve is not particularly limited as long as it is a valve that can switch the gas passing through a plurality of lines, and any valve can be used. Further, as the gas switching period by the switching valve, it is preferable to adopt the number of days until the adsorption breakthrough of the adsorbent in the packed bed is reached, but it can be determined according to other operational circumstances.

[0057]

As described above, according to the present invention, there is provided a digestion gas purifying apparatus capable of efficiently and inexpensively removing a siloxane compound from a siloxane compound-containing gas.

When the present invention is applied to a sewage sludge digestion gas power generation facility, siloxane compounds in this gas are efficiently adsorbed and removed, so that silica (SiO ₂ ) precipitates in a gas engine or a denitration catalyst in a later process. The amount can be greatly reduced. As a result, the frequency of maintenance and inspection of the gas engine can be reduced, and the activity of the denitration catalyst can be maintained for a long time.

Further, in the digestion gas purification apparatus of the present invention, a plurality of packed beds are arranged in parallel, and a switching valve capable of switching gas passing to an arbitrary packed bed;
Since a digestion gas purge pipe connected to each packed bed is provided, the gas passing through a specific packed bed is stopped as necessary by switching the switching valve and purging the packed bed, as needed. It became possible to do.
Therefore, it is possible to perform a maintenance and inspection operation such as replacing the porous filler, which is a packing material of the packed bed, and thus it is possible to continuously operate the digestion gas purification process for a long period of time.

Further, by providing a regenerating device for regenerating the porous adsorbent on which the siloxane compound is adsorbed in the digestion gas purifying apparatus of the present invention, the gas flow is stopped and the used porous adsorbent is used for maintenance and inspection. The agent can be removed and regenerated. Therefore, the porous adsorbent can be used repeatedly, and can be used effectively.

Further, when a regeneration device including a regeneration gas generator, a regeneration gas pipe, and a siloxane compound recovery device is connected to the digestion gas purification device of the present invention, the regeneration treatment of the porous adsorbent is performed as follows. By simply performing a simple operation such as a switching operation of the switching valve, it becomes possible to simultaneously perform the gas passage of the specific packed bed and the regeneration processing of the remaining packed bed. Thereby, the porous adsorbent can be effectively used, and at the same time, the process can be continuously operated for a long time without performing a mechanical operation of replacing the porous adsorbent.

By using the present invention, not only sewage sludge digestion gas but also siloxane compound can be easily and efficiently removed from siloxane compound-containing gas such as various factory exhaust gas handling organic silicon and air conditioning exhaust gas. , Its industrial value is great.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an example of a sewage sludge digestion gas power generation system including a digestion gas purification device according to the present invention.

FIG. 2 is a schematic diagram illustrating a configuration of an example of a digestion gas generation device according to the present invention.

FIG. 3 is a schematic diagram showing the configuration of a porous adsorbent regenerating device used in the present invention.

FIG. 4 is a schematic diagram illustrating a configuration of another example of the digestion gas generation device according to the present invention.

FIG. 5 is a schematic diagram showing a configuration of a conventional sewage sludge digestion gas power generation system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Digestion gas tank 2 ... Digestion gas purification apparatus 3 ... Gas engine (power generation equipment) 4 ... Denitration catalyst tower 11a, 11b ... Packed bed 12a, 12b, 12c, 12d ... Digestion gas switching valve 13a, 13b, 13c, 13d ... Nitrogen gas switching valve 14a, 14b, 14c, 14d: digestion gas pipe 15a, 15b, 15c, 15d: digestion gas purge pipe 16: nitrogen gas supply device 17: post-processing device 18a, 18b, 18c, 18d: regeneration gas tube 19a, 19b, 19c, 19d: Regeneration gas switching valve 20: Regeneration gas generator 21: Siloxane compound recovery device 22: Regeneration tower

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Shimizu 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Hiroshi Shimizu 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Sun F-term in Honko Pipe Co., Ltd. (Reference) 4D012 CA07 CB16 CD01 CD02 CG01 CJ02 4D059 AA03 BA14 CC03 DA19 DA55 DA61

Claims (3)

[Claims] 1. A digestion gas purifying apparatus for adsorbing and removing said siloxane compound by passing a sewage sludge digestion gas containing a siloxane compound, wherein said apparatus is filled with a porous adsorbent for adsorbing said siloxane compound. A plurality of packed beds, a switching valve for switching the passage of the sewage sludge digestion gas introduced into each of the plurality of packed beds, and a digestion connected to each of the plurality of packed beds. An apparatus for purifying a digestive gas, comprising: a gas purge pipe. 2. The digestion gas purifying apparatus according to claim 1, further comprising a regenerating device for regenerating the porous adsorbent on which the siloxane compound has been adsorbed. 3. A regeneration gas generator for desorbing the siloxane compound from the porous adsorbent to which the siloxane compound has been adsorbed to generate a regeneration gas for regenerating the porous adsorbent; It further comprises a regeneration gas pipe provided with a switching valve for switching the regeneration gas introduced into each of the layers, and a recovery device for recovering the siloxane compound desorbed from the porous adsorbent. The digestion gas purification apparatus according to claim 1, wherein