JP5840872B2 - Deodorizing device equipped with a deodorizing element regeneration mechanism - Google Patents

Description

  The present invention relates to a deodorizing device for exhaust gas discharged from a dryer or an incinerator for treating organic waste such as sludge, and particularly relates to a deodorizing device provided with a regeneration mechanism for a deodorizing element. .

Exhaust gas generated during drying of organic waste such as sludge and incineration of waste is released to the atmosphere after removing harmful substances and odors such as volatile organic compounds (VOC) contained therein. Recently, the degree of demand has been further increased.
As a method for deodorizing the exhaust gas, a direct combustion method has been generally used. Such deodorization treatment of exhaust gas by direct combustion is relatively excellent in deodorization performance, but requires a lot of fuel for the deodorization treatment, and is the main purpose of fuel required for drying and incineration. In some cases, more fuel was required for the deodorization treatment.

Therefore, the present applicants have attempted to develop a deodorizing device including a deodorizing element to which cerium oxide (CeO ₂ ) is applied as a catalyst in order to remove harmful substances and odors contained in exhaust gas, and have already filed a patent application. (See Patent Documents 1 and 2).
In the present invention, a deodorizing element is configured by supporting a catalyst on a support base material, and a gas to be treated is supplied to a catalyst unit having the deodorizing element, the temperature of which is adjusted to the optimum operating temperature of the catalyst. That's it. According to the present invention, it is possible to remarkably reduce the fuel consumption required for the deodorization treatment of the exhaust gas, and it is possible to effectively deodorize the exhaust gas having high humidity and containing volatile organic substances. ing.

However, when processing exhaust gas containing dust, it is inevitable that dust will adhere to the deodorizing element, and as the amount of dust attached increases, the pressure loss increases and the processing efficiency decreases. In addition, the power consumption of the blower mechanism increases.
Such pressure loss is small when the supporting base is made of a honeycomb block, but when soot deposition proceeds, the flow of exhaust gas that passes through the ventilation holes in the honeycomb block is hindered. As a result, the pressure loss becomes enormous. For example, in a system that uses a burner to heat the gas to be processed to an optimum operating temperature, the pressure in the system increases, causing burner failure and making it difficult to continue operation. Alternatively, it is inevitable that the catalyst is covered with soot and the efficient contact between the catalyst and the odor component is hindered and the deodorizing function is lowered.
In order to eliminate the pressure loss and regenerate the catalytic function, a regeneration mechanism has been devised that removes the dust adhering to the deodorizing element with purge air.
However, when a device configuration that improves the deodorizing effect by arranging a plurality of deodorizing elements is adopted, the dust removed from the deodorizing elements by the purge air enters into the other deodorizing elements, and then again enters the deodorizing elements. It can occur that it adheres.

Japanese Patent Application No. 2009-251854 Japanese Patent Application No. 2010-013094

  The present invention has been made from such a background, and in particular, a novel deodorizing element that can avoid excessive pressure loss and can efficiently remove dust is also provided. The development of a deodorizing device equipped with a regeneration mechanism is a technical issue.

That is, the deodorizing apparatus provided with the regeneration mechanism of the deodorizing element according to claim 1 uses the deodorizing element carrying the catalyst component to oxidize and / or decompose organic substances in the exhaust gas containing soot and dust to obtain deodorized exhaust gas. in deodorizer, this device, with facing surfaces of the deodorizing device, and configured nozzle unit is equipped to be able to supply purge air to the entire surface of the deodorizing device by being swept, the A plurality of deodorizing elements are provided in series, and the nozzle unit is provided with the same number as the number of deodorizing elements, and each nozzle unit can be individually swept. has been configured to, and, deodorizing element characterized in that it draft protection plate is provided in the upstream side of the nozzle unit located downstream Deodorizing device raw mechanism is provided.

In addition to the above requirements, the deodorizing apparatus provided with the deodorizing element regeneration mechanism according to claim 2 is characterized in that the nozzle unit has one end of a vent pipe connected to the center of gravity of the nozzle pipe, and the center of gravity of the nozzle pipe passes through. It is characterized by being a rake-like one suspended by a trachea .

Furthermore according to claim 3 deodorization apparatus reproducing mechanism has been equipped deodorizing device according, in addition to the requirements, the nozzle unit is one comprising as wherein the spout is those thousand Torihai column .
The above-described problems can be solved by using the requirements described in the respective claims as means.

According to the first aspect of the invention, by sweeping the nozzle unit linearly, the purge air can be uniformly applied over the entire surface of the deodorizing element facing the nozzle unit, and dust adhering to the deodorizing element. Can be removed evenly and effectively.
Further, the nozzle unit can be provided at a position where the flow path of the exhaust gas is not obstructed when the air purge is not performed, and the nozzle unit prevents the flow of the exhaust gas flowing into the deodorizing element so that a dead space is formed in the deodorizing element. It is possible to avoid a situation in which the entire surface of the deodorizing element cannot be used efficiently due to the occurrence of a specific drift or a specific drift.
In addition, even when air purge is not performed, by constantly moving the nozzle unit up and down, it is possible to avoid a specific drift of exhaust gas from occurring in a fixed manner and to stir the exhaust gas Therefore, it can be supplied to the deodorizing element as a homogeneous exhaust gas state.
Furthermore, when a deodorizing element in which a catalyst is supported on a honeycomb-shaped support substrate is used, purge air can be allowed to enter a vent formed in a direction perpendicular to the surface of the deodorizing element facing the nozzle unit, The dust adhering to the inside of the vent hole can be effectively removed.
In addition, the regeneration process for all the deodorizing elements can be performed simultaneously, and the regeneration process can be performed for each deodorizing element individually.
Furthermore, the oxidation and / or decomposition of the organic matter in the exhaust gas containing dust can be performed in stages by a plurality of deodorizing elements arranged in series, and in the exhaust gas flowing out from the upstream deodorizing element. Hazardous and odorous components are diffused before flowing into the downstream deodorizing element, allowing them to flow into the downstream deodorizing element in a state of increased uniformity, and the catalytic function of the entire surface of the downstream deodorizing element Can be exhibited effectively.
In addition, since a space for sweeping the nozzle unit is formed between the deodorizing elements, the dust that has passed through the upstream deodorizing element cannot easily reach the downstream deodorizing element, and the deodorizing element Dust is easily collected at the lower part between the elements.
Furthermore, since the surface from which the exhaust gas flows in the upstream deodorizing element and the surface from which the exhaust gas flows in the downstream deodorizing element face each other, the shape of these surfaces and the position from which the exhaust gas flows (hole) It is easy to select the positional relationship, the shape relationship, and the size relationship between the holes (holes) and the positions (holes) for each deodorizing element in consideration of the catalytic efficiency and the influence of dust.
Furthermore, when the deodorizing element is deteriorated, only the deteriorated deodorizing element can be easily replaced.
Furthermore, the thickness of the deodorizing element in the flow direction of the exhaust gas and the interval between the deodorizing elements can be easily set so that the dust is easily purged from the deodorizing element according to the nature of the soot.

Furthermore, by causing the purge air containing dust removed from the deodorizing element located on the upstream side to collide with the ventilation prevention plate, the dust is prevented from reattaching to the deodorizing element located on the downstream side. Can do.
Further, the dust can be separated from the purge air, and dropped to the lower part of the casing to be accumulated at that position.

According to the second aspect of the invention, since the vent pipe is connected to the center of gravity of the nozzle pipe, the sweep operation of the nozzle unit in the vertical direction can be performed in a stable state.

Furthermore, according to the third aspect of the present invention, the purge air can be made to act even more safely over the entire surface of the deodorizing element facing the nozzle unit.

It is a perspective view which shows a partially see through deodorizing device of the present invention. It is a side view which shows a partially see through deodorizing device of the present invention. It is a perspective view which shows a deodorizing element. It is a front view which shows a nozzle unit and its peripheral member. It is a vertical side view which shows a mode that the dust adhering to a deodorizing element is removed by the purge air which ejects from a nozzle unit. It is sectional drawing of the deodorizing apparatus comprised so that a nozzle unit might be swept horizontally.

  The best mode of the deodorizing apparatus provided with the regeneration mechanism of the deodorizing element of the present invention is as shown in the following embodiment, but this embodiment is appropriately modified within the scope of the technical idea of the present invention. It is also possible.

Hereinafter, regarding the “deodorizing apparatus provided with a regeneration mechanism of the deodorizing element” (hereinafter referred to as deodorizing apparatus D) of the present invention, the configuration of a basic embodiment will be described, and then the operation mode thereof will be described.
As shown in FIGS. 1 and 2, the deodorizing apparatus D uses the exhaust gas G0 discharged from a dryer, an incinerator, or the like as a gas to be treated, and the organic matter contained in the exhaust gas G0 is obtained by the catalytic action of the deodorizing element 35. It is an apparatus that oxidizes and / or decomposes at a low temperature to produce deodorized exhaust gas G1.

The deodorizing device D is installed on the base B, and is formed so that the heating chamber 1, the air supply chamber 2, the deodorizing chamber 3 and the exhaust chamber 4 communicate with each other, and further deodorizing the deodorizing chamber 3. The element 35 is accommodated and a dust removing mechanism 5 is provided.
In the present specification, the heating chamber 1 side is defined as the front or upstream, and the exhaust chamber 4 side is defined as the rear or downstream.

  First, the heating chamber 1 is provided with a burner 11, which is a portion for burning fuel by the burner 11 and supplying high temperature outside air A to the adjacent supply chamber 2.

  Next, the air supply chamber 2 is formed by connecting a duct 22 to an air supply port 21 formed in the upper part of the housing as an example, and is supplied into the air supply chamber 2 by a fan 23 through the duct 22. The exhaust gas G0 is mixed with the high temperature outside air A so as to be heated.

Next, the deodorizing chamber 3 is configured such that an inlet / outlet 31 is opened on the side surface of the casing, and the deodorizing element 35 can be taken in and out therefrom.
Specifically, a carriage 34 provided with a cover plate 32 and a placement plate 33 is used, and in a state where three units are set in series on the placement plate 33 as an example of the deodorizing element 35, By moving the carriage 34 so that the mounting plate 33 and the deodorizing element 35 enter the deodorizing chamber 3, the entrance / exit 31 can be closed by the lid plate 32.
In addition, the cover plate 32 is appropriately provided with a packing and a lock mechanism so that the confidentiality of the deodorizing chamber 3 can be secured.
As for the arrangement of the deodorizing elements 35, a plurality of deodorizing elements 35 may be arranged in series as described above, or some or all of the deodorizing elements 35 may be arranged in parallel.

Here, the deodorizing element 35 will be described in detail. As shown in FIG. 3, the deodorizing element 35 carries cerium oxide powder (light yellow powder) as a catalyst 37 on the surface of the support substrate 36 and the inner surface of the vent hole 38. It is a thing.
As an example of the support substrate 36, as shown in FIG. 3A, honeycomb-like ceramics having a plurality of air holes 38 are formed in a cubic shape. Then, the support base material 36 is immersed in the slurry prepared by mixing the catalyst 37, water, and a binder, and then dried and fired, so that the surface of the support base material 36 and the inner surface of the air vent 38 are formed. A deodorizing element 35 carrying the catalyst 37 is formed.
The deodorizing element 35 may be configured as a single block piece, or may be configured by combining a plurality of small block pieces. In this embodiment, as an example, four deodorizing element pieces 35a are combined for deodorization. While constituting the member 35, the deodorizing element 35 was held by the frame 39.
Further, a deodorizing element piece 35b configured by dividing the deodorizing element piece 35a in the vertical direction with respect to the vent hole 38 and a deodorizing element piece 35c configured by dividing the deodorizing element piece 35a in the horizontal direction with respect to the vent hole 38 are combined. The deodorizing element 35 may be configured.
In this way, by configuring the deodorizing element 35 with a plurality of element pieces, for example, by exchanging the position of each element piece at regular time intervals, the element piece with a small amount of dust d attached is positioned on the upstream side. The 37 functions can be maintained over a long period of time.

  Further, as shown in FIG. 3B, the support base material 36 may be a small spherical one, and a deodorizing element 35 in which a catalyst 37 is supported on the surface of the support base material 36 may be employed. In this case, it is assumed that the plurality of deodorizing elements 35 are accommodated in a frame 39 on which a net 39a is stretched.

Next, the dust removal mechanism 5 that functions as a regeneration mechanism for the catalyst element 35 will be described. As an example, the dust removal mechanism 5 has a cylinder 56 as a drive unit for the sweep mechanism with respect to a machine frame F standing on the deodorization chamber 3. The nozzle unit 51 is provided at the tip of the rod 56 a in the cylinder 56 so as to be positioned in the deodorizing chamber 3.
As shown in FIG. 4, the nozzle unit 51 is formed in a rake shape as an example by connecting the center of gravity of a nozzle pipe 54 in which a jet port 53 is formed to one end of a vent pipe 52. In this embodiment, as shown in FIG. 4A, a slit-like jet 53 having a width of 1 to 2 mm and a length equivalent to that of the catalyst element 35 is formed. As shown in FIG. 4, the short slit-like jet ports 53 may be arranged in a staggered arrangement , or the small-diameter jet ports 53 may be formed densely as shown in FIG.
The tip of the rod 56a is connected to the free end of the vent pipe 52 with a tee 55 interposed between them, and a blower 58 is connected to the air supply port 55a of the tee 55 using a conduit 57. Is done. The conduit 57 is provided with a valve 57a.

  By adopting the above-described configuration, it is possible to sweep the nozzle unit 51 in the vertical direction so that the purge air acts on the entire surface of the deodorizing element 35. At this time, as shown in FIG. 4, the nozzle unit 51 has a rake shape (inverted T shape) in which one end of the vent pipe 52 is connected to the center of gravity of the nozzle pipe 54, and the rod 56 a in the cylinder 56 is Since it is connected to the vent pipe 52, the center of gravity is in a suspended state, so that the vertical movement of the nozzle unit 51 can be performed stably without applying excessive stress. .

  The nozzle unit 51 includes the same number as the number of deodorizing elements 35. Hereinafter, when the nozzle units 51 are distinguished, the reference numerals are designated as 511, 512, 513. In this case, the reference numerals are 351, 352, 353,. Similarly, when distinguishing the cylinders 56, reference numerals 561, 562, 563,.

  When a plurality of nozzle units 51 are provided, a ventilation prevention plate 59 whose upper part is bent forward is provided on the upstream side of each nozzle unit 511, 512, 513. However, it is not necessary to provide the ventilation prevention plate 59 in the nozzle unit 511 at the most upstream part.

Next, the exhaust chamber 4 has an exhaust port 41 formed in the upper part of the housing as an example, and exhausts the deodorized exhaust gas G1 sent from the deodorization chamber 3 to the outside through the exhaust port 41. It is a part.
The deodorizing apparatus D of this invention is comprised as mentioned above as an example, and the operation | movement aspect is demonstrated below.

[Setting of deodorizing element]
First, the deodorizing element 35 is set inside the deodorizing chamber 3 through the inlet / outlet 31. With the deodorizing elements 351, 352, and 353 set on the mounting plate 33, the mounting plate 33 and the deodorizing element are set. The carriage 34 is moved so that 35 enters the deodorizing chamber 3, and the inlet / outlet 31 is closed by the cover plate 32, thereby ensuring the airtightness of the deodorizing chamber 3.
At this time, as shown in FIG. 5 (a), the nozzle units 511, 512, and 513 are positioned obliquely in front of the deodorizing elements 351, 352, and 353 (hereinafter, this position is referred to as a standby position). .

〔heating〕
Next, the outside air A heated by the burner 11 in the heating chamber 1 and the exhaust gas G0 as the gas to be processed are supplied into the air supply chamber 2. In this embodiment, as an example, the exhaust gas at 200 ° C. The gas G0 was heated to about 450 ° C.
The exhaust gas G0 is generated during drying of organic waste such as sludge or incineration of waste, and the content of soot and dust d is about 0.5 g / m ³ N by a cyclone dust collector or the like. It has been done.

[Deodorization treatment]
Next, the exhaust gas G0 is sent to the deodorizing chamber 3, and comes into contact with the deodorizing element 35. When the odorous component (volatile organic substance or the like) comes into contact with the catalytic component (cerium oxide), it is oxidized by its catalytic action. , CO ₂ , H ₂ O, etc., and the deodorized exhaust gas G1 is obtained by removing the odor component to a predetermined value or less (for example, the odor index 30 or less). In this embodiment, as shown in FIG. 5A, since the three deodorizing elements 35 are arranged in series, the exhaust gas G0 that has passed through the vent hole 38 in the deodorizing element 351 is subsequently deodorized element 352. In the process of passing through the vent hole 38 and further passing through the vent hole 38 of the deodorizing element 353, the odor component is gradually removed. At this time, the dust d contained in the exhaust gas G0 adheres to the surface of the deodorizing element 35 and the inner surface of the vent hole 38.
Next, the deodorized exhaust gas G1 reaches the inside of the exhaust chamber 4 and is exhausted to the outside.
The cerium oxide (CeO ₂ ) has a deodorizing action effectively at 300 ° C. or higher. For this reason, the temperature of the exhaust gas G0 is heated to 300 ° C. or higher in the air supply chamber 2 and then the deodorizing element 35 is heated. By contacting, the oxidation reaction is promoted.

[Regeneration treatment of deodorizing element]
The deodorizing element 35 is regenerated before the deodorizing element 35 adheres to the dust d and the deodorizing ability of the catalyst 37 is significantly reduced or the pressure loss is excessive. Will be described.
The timing of the regeneration process may be performed at regular intervals by a timer or the like. For example, the pressure loss generated in the deodorizing element 35 is measured by measuring the static pressure difference between the deodorizing chamber 3 upstream and downstream of the deodorizing element 35. The reproduction process may be performed when the value exceeds a certain value.
First, in a state where the regeneration process is not performed, the nozzle units 511, 512, and 513 are positioned at the standby position as shown in FIG.
Then, by extending the rods 56a in the cylinders 561, 562, 563 at the same speed, the nozzle units 511, 512, 513 are lowered at the same time, and the outside air G0 is sucked and compressed by the blower 58 to be about 3-6 kPaG as purge air. Supply at a pressure of.

Thereafter, the cylinders 561, 562, and 563 face the surface of the deodorizing elements 351, 352, and 353 as shown in FIG. 5B, and purge air is discharged over the entire surface of the deodorizing elements 351, 352, and 353 as shown in FIG. It will be supplied at a flow rate of about 70 to 100 m / s.
The purge air blows off the dust d adhering to the surface of the deodorizing element 35 and travels in the vent hole 38 to blow off the soot d adhering to the inner surface of the vent hole 38, thereby generating in the deodorizing element 35. While the pressure loss is eliminated, the catalyst 37 and the exhaust gas G0 can be contacted, and the deodorizing elements 351, 352, and 353 are regenerated.
At this time, for example, the purge air that has been ejected from the nozzle unit 511 and passed through the vent hole 38 in the deodorizing element 351 is blocked by the venting prevention plate 59 provided in the downstream nozzle unit 512, and the deodorizing chamber 3. At the same time as being dispersed inside, the dust d is separated from the purge air, falls and accumulates in the lower part of the deodorizing chamber 3.
In this way, the ventilating plate 59 prevents the purge air that has regenerated the upstream deodorizing element 35 from reaching the downstream deodorizing element 35, so that the dust d contained in the purge air is downstream. A situation in which the deodorizing element 35 is reattached can be avoided.
The dust d accumulated in the lower part of the deodorizing chamber 3 is scraped out from an inspection window (not shown) provided in the lower part of the cover plate 32, or a screw conveyor provided in advance at a position where the dust d is accumulated. It is assumed that the paper is automatically discharged by the transport means.
Further, a part of the dust d removed from the deodorizing element 353 may be discharged to the outside through the exhaust chamber 4 and thus is collected by a filter or the like provided at an appropriate location.
The purge air may be heated by a heater or the like and jetted from the nozzle unit 51 to the deodorizing element 35 as hot air.

Since the deodorizing element 35 is more heavily attached to the upstream side of the deodorizing element 35, for example, as shown in FIG. 5C, by extending the rods 56a in the cylinders 561 and 562 at the same speed, the nozzle unit 511 and 512 may be lowered at the same time so that only the deodorizing element 351 is regenerated. At this time, the ejection of purge air from the nozzle units 512 and 513 is stopped by operating the valve 57a.
Further, in the case where only the deodorizing element 353 located at the most downstream side is to be regenerated, only the nozzle unit 513 is lowered by extending only the rod 56a of the cylinder 563, as shown in FIG. 5 (d). The purge air may be ejected only from the nozzle unit 513.

  In the above-described series of regeneration processes, the nozzle unit 51 has a rake shape in which one end of the vent pipe 52 is connected to the center of gravity of the nozzle pipe 54 as shown in FIG. Is connected to the vent pipe 52, the center of gravity is in a suspended state, so that the vertical movement of the nozzle unit 51 is stably performed without applying extra stress.

Further, when the nozzle unit 51 is swept toward the surface of the deodorizing element 35, the purge air ejected from the ejection port 53 can be applied evenly to the deodorizing element 35.
Furthermore, the nozzle unit 51 can be provided at a position where the flow path of the exhaust gas G0 is not obstructed when the air purge is not performed, and the nozzle unit 51 obstructs the flow of the exhaust gas G0 flowing into the deodorizing element 35. It is possible to avoid a situation in which a dead space is generated in the deodorizing element 35 or a specific drift is generated in a fixed manner so that the entire surface of the deodorizing element 35 cannot be used efficiently.
Incidentally, when the nozzle unit 51 is fixed at a position where purge air acts on the entire area of the deodorizing element 35, the nozzle unit 51 obstructs the flow of the exhaust gas G0 flowing into the deodorizing element 35. As a result, a dead space is generated in the deodorizing element 35, and a specific drift is fixedly generated in the exhaust gas G0 hitting the nozzle unit 51, so that the entire surface of the deodorizing element 35 cannot be used efficiently. It becomes.

[Other Examples]
The deodorizing apparatus D of the present invention is configured as described above as an example, but can take the following forms within the scope of the technical idea of the present invention.
First, in the basic embodiment described above, the nozzle unit 51 is swept in the vertical direction. For example, when the height of the building is limited, the sweep is performed in the horizontal direction as shown in FIG. Such a configuration can also be adopted.
Further, a cleaning liquid such as water may be ejected from the ejection port 53 of the nozzle unit 51 so that the dust d adhering to the deodorizing element 35 is washed away.

D Deodorizing device 1 Heating chamber 11 Burner 2 Air supply chamber 21 Air supply port 22 Duct 23 Fan 3 Deodorizing chamber 31 Entrance / exit 32 Cover plate 33 Mounting plate 34 Carriage 35 Deodorizing element 351 Deodorizing element 352 Deodorizing element 353 Deodorizing element 35a Deodorizing element Piece 35b Deodorizing element piece 35c Deodorizing element piece 36 Support base material 37 Catalyst 38 Vent hole 39 Frame body 39a Net body 4 Exhaust chamber 41 Exhaust port 5 Dust removal mechanism 51 Nozzle unit 511 Nozzle unit 512 Nozzle unit 513 Nozzle unit 52 Vent pipe 53 Jet Outlet 54 Nozzle pipe 55 Tee 55a Air supply port 56 Cylinder 561 Cylinder 562 Cylinder 563 Cylinder 56a Rod 57 Pipe line 57a Valve 58 Blower 59 Ventilation prevention plate A Outside air B Base d Dust dust F Machine frame G0 Exhaust gas G1 Deodorized exhaust gas

Claims (3)

In a deodorizing apparatus that deodorizes exhaust gas containing exhaust gas by oxidizing and / or decomposing it into deodorized exhaust gas by a deodorizing element carrying a catalyst component,
The apparatus includes a nozzle unit configured to face the surface of the deodorizing element and to supply purge air to the entire surface of the deodorizing element by being swept ,
The deodorizing element comprises a plurality of groups arranged in series,
The nozzle unit is provided with the same number of deodorizing elements, and each nozzle unit is configured to be able to perform a sweep operation individually,
A deodorizing apparatus provided with a regeneration mechanism for a deodorizing element , wherein a ventilation prevention plate is provided on the upstream side of the nozzle unit located on the downstream side .
The nozzle unit, one end of the vent pipe is connected to the center of gravity portion of the nozzle pipe, according to claim 1, wherein the center of gravity portion of the nozzle tube is characterized in that the rake-like, which is a state suspended by a vent tube A deodorizing apparatus provided with a regeneration mechanism for deodorizing elements.
The nozzle unit, deodorization apparatus reproducing mechanism has been equipped deodorizing device according to claim 1 or 2, wherein the spout is those thousand Torihai column.

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