WO2010084577A1

WO2010084577A1 - Adsorption tower of dry gas treatment equipment

Info

Publication number: WO2010084577A1
Application number: PCT/JP2009/050778
Authority: WO
Inventors: 亮鈴木
Original assignee: ジェイパワー・エンテック株式会社
Priority date: 2009-01-20
Filing date: 2009-01-20
Publication date: 2010-07-29
Also published as: JP5351902B2; JPWO2010084577A1

Abstract

Disclosed is an adsorption tower of dry gas treatment equipment wherein toxic substances in waste gas are adsorbed to an adsorbent effectively to the maximum while avoiding complication of constitution. The adsorption tower (100) has a supply port (101) of a granular adsorbent (B), a section (102) for bringing the adsorbent (B) and waste gas (A) into contact with each other, and a delivery section (103) and a discharge section (104) of the adsorbent (B) which adsorbed the waste gas (A). A waste gas supply passage (108) and a waste gas discharge passage (109) are provided in the contact section (102) wherein the supply passage (108) has one end side communicating with a hood section (106), the other end side extending in the contact section (102) in the horizontal direction, and an end portion closed for a hood section (107). The discharge passage (109) has one end side communicating with the hood section (107), the other end side extending in the contact section (102) in the horizontal direction, and an end portion closed for a hood section (106). The supply passage (108) and the discharge passage (109) are formed by arranging saddle members (110) of identical structure. The saddle member (110) is a reverse V-shaped member arranged to penetrate the contact section (102) in the horizontal direction and forms an internal gas flow passage (111) by preventing permeation of the adsorbent (B) flowing downward at an upper part.

Description

Adsorption tower of dry exhaust gas treatment equipment

The present invention relates to an adsorption tower for bringing an adsorbent into contact with exhaust gas in a dry exhaust gas treatment apparatus using a granular adsorbent.

In order to remove sulfur oxides, nitrogen oxides and the like contained in exhaust gas such as boiler exhaust gas and incinerator exhaust gas, a dry exhaust gas treatment apparatus using an adsorption tower filled with a granular adsorbent is known.

Examples of adsorbents include carbonaceous adsorbents, alumina adsorbents, siliceous adsorbents, etc., but carbonaceous ones can be regenerated at a relatively low temperature and simultaneously remove various harmful substances. Excellent because it can.

Examples of the carbonaceous adsorbent include activated carbon, activated coke and the like, and in particular, a pelletized adsorbent of about 0.5 to 4 cm is preferable, and these adsorbents are publicly known. The inside of the adsorption tower is composed of a moving bed filled with granular adsorbent, and harmful components in the exhaust gas can be removed by bringing the exhaust gas at 100 to 200 ° C. into contact with the adsorbent of the moving bed. Nitrogen oxides in the exhaust gas are decomposed into nitrogen and water by the catalytic action of the adsorbent by adding ammonia, urea or the like to the exhaust gas. Other harmful components are removed mainly by adsorption of the adsorbent.

FIG. 10 shows a typical configuration example of this type of dry exhaust gas treatment apparatus. The illustrated processing apparatus includes an adsorption tower 1, a regeneration tower 2, an adsorbent storage tank 3, and a by-product recovery apparatus 4, and exhaust gas A generated from an exhaust gas generation source 5 is introduced into the adsorption tower 1. . In the adsorption tower 1, the adsorbent B is flowing downward. An adsorbent cutout portion is provided at the lower end of the adsorption tower 1, and the adsorbent B that has adsorbed the extracted harmful substances is fed into the regeneration tower 2.

In the regeneration tower 2, harmful substances are removed from the adsorbent B, the harmful substances are sent to the by-product recovery device 4, and the adsorbent B regenerated by removing the harmful substances is passed through the sieve equipment 6 to the adsorption tower. 1 is fed to the top. Further, a fresh adsorbent B is supplied from the adsorbent storage tank 3 to the adsorption tower 1. The exhaust gas A from which harmful substances have been removed after passing through the adsorption tower 1 is released from the chimney 7 to the atmosphere.

The details of the adsorption tower 1 of FIG. 10 are shown in FIG. The adsorption tower 1 shown in the figure has a cylindrical main body 1a, an exhaust gas inlet hood 1b provided on the opposite side of the main body 1a, and an exhaust gas outlet hood 1c. An adsorbent layer cartridge 1d through which B flows downward is provided. On both sides of the adsorbent layer cartridge 1d, inlet space portions 1e and outlet space portions 1f are alternately provided, the inlet space portions 1e communicate with the exhaust gas inlet hood 1b, and the outlet space portion 1f communicates with the exhaust gas outlet hood 1c. Communicate.

The exhaust gas A introduced from the inlet space portion 1e contacts the adsorbent B moving in the downward direction so as to be orthogonal from the side, passes through the outlet space portion 1f, and reaches the outlet hood 1c. .

At this time, an inlet louver 1g and an intermediate louver 1h are provided upstream of the adsorbent layer cartridge 1d through which the exhaust gas A circulates. By increasing the flow rate of the adsorbent in this portion, harmful substances in the exhaust gas A are obtained. The cartridge 1d is prevented from being blocked by the adhering of the toner.

An outlet louver 1i for preventing the adsorbent B from leaking is provided on the downstream side of the cartridge 1d. FIG. 12 is an example in which the outlet hood 1c is provided on the same side as the inlet hood 1b, and the substantial structure is the same as in the case of FIG.

In the conventional adsorption tower 1 shown in FIGS. 11 and 12, an adsorbent layer in which the adsorbent B descends from the upper side to the lower side is formed in the region sandwiched between the inlet louver 1g and the outlet louver 1i. The harmful substances in the exhaust gas A are adsorbed by the adsorbent B while the exhaust gas A passes through the adsorbent layer. The adsorbent B that has adsorbed the harmful substances is quantitatively cut out by an adsorbent cutting device installed at the lower part of the adsorption tower, and discharged from the adsorbent discharge port to the adsorbent transfer equipment.

Therefore, in the adsorption tower 1 having such a structure, since the flow directions of the adsorbent B and the exhaust gas A are orthogonal to each other, harmful substances in the exhaust gas A are located above the adsorbent layer as shown in FIG. It is carried only on the upstream side of the exhaust gas A, and the hazardous substance carrying region spreads downstream of the exhaust gas A as it goes downward of the adsorbent layer.

That is, the adsorbent B on the exhaust gas downstream side above the adsorbent layer has a portion that does not contribute to the adsorption, and the amount of harmful substances carried in the horizontal plane at the lower end of the adsorbent layer is higher on the upstream side of the exhaust gas A. Many tend to decrease toward the downstream side of the exhaust gas A.

In this case, if the adsorbent B on the downstream side of the exhaust gas A is sufficiently loaded with harmful substances, the harmful substances that have passed without being adsorbed will be discharged from the exhaust gas outlet hood 1c. The performance will be reduced.

In the adsorption tower 1 shown in FIGS. 11 and 12, when a large amount of exhaust gas A is processed, a plurality of adsorbent layer cartridges 1d are provided. At that time, an inlet space 1e for distributing exhaust gas is required on the front surface of each adsorbent layer cartridge 1d, and an outlet space portion for collecting treated exhaust gas is disposed on the rear surface of each adsorbent layer cartridge 1d. If is required.

At this time, the total volume of the inlet space 1e and the outlet space 1f may reach twice the total volume of the adsorbent layer cartridge 1d, and there is a problem that the entire volume of the adsorption tower 1 becomes excessively large. It was. Further, as shown in FIG. 13, there is a problem that the loading amount of the harmful substance is greatly different between the upstream side and the downstream side of the exhaust gas A, and the utilization efficiency of the adsorbent B is poor.

On the other hand, the adsorption tower 10 of another conventional example shown in FIG. 14 has an adsorbent supply facility 10a, an adsorbent distribution funnel / exhaust gas extraction space 10b, an adsorbent layer 10c, an exhaust gas supply tank from the upper side to the lower side. 10d, an adsorbent extraction funnel 10f, and an adsorbent cutout device 10g, which constitute one unit as a whole.

The adsorption tower 10 having this structure has a two-stage structure in which the above-mentioned units are stacked upward in order to process a large amount of exhaust gas A. The adsorbent B is supplied to each of the upper unit and the lower unit of the stacked structure, and the exhaust gas A is divided and supplied to each unit.

That is, the adsorbent B supplied to the upper unit does not pass through the lower unit after passing through the upper unit, and the exhaust gas A supplied from the gas supply rod 10d of the upper unit is exhaust gas extraction space 10b of the lower unit. Never reach. Conversely, the exhaust gas supplied from the exhaust gas supply tank of the lower unit does not reach the exhaust gas extraction space of the upper unit. The configuration of the conventional example shown in FIG. 14 is disclosed in Patent Documents 1 and 2 below.

Japanese Patent Publication No. 7-94010 Special table 2003-508212 gazette

In the conventional example shown in FIG. 14, the adsorbent B is a so-called counter-current type in which the adsorbent B descends from above to below for each unit, and the exhaust gas A rises from below to above. The distribution of the amount of harmful substances carried in the counter-current type adsorption tower 10 in the same horizontal plane can theoretically be made uniform.

That is, the adsorbent B discharged from the adsorbent extraction funnel of each unit carries a toxic substance uniformly in the same plane as shown in FIG. 15, and the prior art shown in FIG. 11 and FIG. Although it is possible to increase the utilization efficiency of the adsorbent B as compared with the example, this conventional example also has a technical problem described below.

That is, in the conventional example shown in FIG. 14, in order to treat a large amount of exhaust gas A, a plurality of units are stacked, so that the adsorbent B extracted from the upper unit is disposed inside the lower unit. It has a structure that can reach the adsorbent cutting device through the extraction chute provided therethrough. Therefore, the inside of the adsorption tower has a very complicated structure, and the upper and lower two-stage units are considered to be structural limitations.

Further, not only a large space in the vertical direction is required between the upper unit and the lower unit, but also the number of stacked stages in the vertical direction is limited. Therefore, in an adsorption tower for treating a larger amount of exhaust gas A, 2 There is a problem that a stepped unit must be added and a large installation space is required.

The present invention has been made in view of the above-described conventional problems, and the object thereof is to maximally effectively adsorb (support) harmful substances in exhaust gas on an adsorbent while avoiding complication of the configuration. It is possible to provide an adsorption tower that minimizes the use of adsorbent and minimizes the volume.

Also, it is to provide an adsorption tower capable of reversing the flow direction of the gas passing through the adsorbent, which has been impossible in the conventional example.

In order to achieve the above-mentioned object, the present invention provides a granular adsorbent supply port provided on the tower top side, a contact portion for contacting the exhaust gas supplied while moving the adsorbent downward, and a tower bottom side. An adsorbent cut-out portion that has been disposed and adsorbed exhaust gas at the contact portion, and an exhaust port for the adsorbent, and an exhaust gas inlet hood portion that feeds the exhaust gas to be treated into the contact portion, and processed from the contact portion In an adsorption tower for use in a dry exhaust gas treatment apparatus that removes harmful components in exhaust gas by adsorbing and removing the harmful components in the exhaust gas with a particulate adsorbent, one end side communicates with the exhaust gas inlet hood portion, and the other end side A plurality of exhaust gas supply passages extending in the horizontal direction in the contact portion and having an end portion closed with respect to the exhaust gas outlet hood portion, one end side communicates with the exhaust gas outlet hood portion, and the other end side is in contact with the exhaust gas outlet hood portion. A plurality of exhaust gas discharge passages extending horizontally in the section and closed at the end portions with respect to the exhaust gas inlet hood section, and blocking the adsorbent permeation at the upper portion to push it sideways. A saddle member that forms a gas flow path therein is installed so as to penetrate horizontally in the contact portion, and the gas passage is used as the exhaust gas supply path and the exhaust gas discharge path, and the plurality of exhaust gas supply paths and the The plurality of exhaust gas discharge paths are arranged at predetermined intervals on a horizontal plane with predetermined intervals in the vertical direction.

According to the adsorption tower configured as described above, the plurality of exhaust gas supply paths have one end communicating with the exhaust gas inlet hood, the other end extending in the horizontal direction in the contact portion, and the end serving as the exhaust gas outlet hood. The plurality of exhaust gas discharge passages are connected to the exhaust gas outlet hood part at one end side, are extended in the horizontal direction through the contact part at the other end side, and are closed to the exhaust gas inlet hood part at the other end side. The exhaust gas supplied through the supply path passes through the contact portion and travels toward the exhaust gas discharge path. At this time, the plurality of exhaust gas supply paths and the plurality of exhaust gas discharge paths are predetermined in the vertical direction. Therefore, the adsorbent that flows downward flows in a direction opposite to or parallel to the adsorbent that flows downward.

For this reason, similarly to the conventional example shown in FIG. 14, it becomes possible to uniformly carry harmful substances in the same plane along the flow direction of the exhaust gas, and to maximize the harmful substances in the exhaust gas to the adsorbent. It can be effectively adsorbed to minimize the amount of adsorbent used and to minimize the volume of the adsorption tower.

In addition, the exhaust gas supply path and exhaust gas discharge path having such a function are installed so as to penetrate the contact portion in the horizontal direction, prevent the adsorbent from permeating at the upper part and push it sideways, Since it is obtained by installing the saddle member that forms the flow passage so as to penetrate horizontally in the contact portion, the overall structure is not complicated.

Further, the exhaust gas supply path and the exhaust gas discharge path are installed so that the adsorbent is prevented from permeating at the top and pushed sideways, and the saddle member that forms the gas flow path is penetrated horizontally in the contact portion. Therefore, since the substantial configuration of the exhaust gas supply path and the exhaust gas discharge path is the same, the flow direction of the gas passing through the adsorbent can be reversed.

A pair of the exhaust gas discharge passages are arranged at intervals in the vertical direction of the exhaust gas supply passage, and the flow direction of the adsorbent and the movement direction of the exhaust gas in contact therewith are opposed above the exhaust gas supply passage. And a parallel flow region in which the flow direction of the adsorbent and the movement direction of the exhaust gas in contact therewith are parallel to each other on the lower side of the exhaust gas supply path. *

A plurality of the exhaust gas supply passages and the exhaust gas discharge passages can be disposed so as to be adjacent to each other at a predetermined interval in the horizontal direction within the same horizontal plane.

The exhaust gas supply path and the exhaust gas discharge path are arranged in a plurality of stages at a predetermined interval in the vertical direction in the vertical direction of the adsorption tower, and are adjacent to the gas supply path and the gas exhaust in the vertical direction. Roads can be arranged in a staggered pattern.

When the counterflow region and the parallel flow region are arranged in a step shape, the volume of the adsorption contribution zone can be changed.

The exhaust gas supply passage and the exhaust gas discharge passage are movable with an adjustment plate for adjusting the amount of gas passing through either or both of the exhaust gas inlet hood part and the exhaust gas outlet hood part communicating with the exhaust gas outlet hood part. Can be arranged.

The exhaust gas supply path and the exhaust gas discharge path are in a steady state in which the exhaust gas permeates from the exhaust gas supply path to the exhaust gas discharge path by a switching operation of a switching valve disposed outside, and the exhaust gas from the exhaust gas discharge path. It can be set as the backflow state which permeate | transmits to the said waste gas supply path. The saddle member may be provided with a through-hole through which the exhaust gas can permeate.

The saddle member can be provided with a louver on the side that allows the exhaust gas to pass therethrough and prevents the adsorbent from passing therethrough.

The adsorption tower configured as described above minimizes the amount of adsorbent used by making it possible to adsorb (support) harmful substances in exhaust gas to the adsorbent as effectively as possible while avoiding complication of the configuration. It is possible to stop and minimize the volume, and to reverse the flow direction of the gas passing through the adsorbent, which is impossible in the conventional example.

FIG. 1 is a longitudinal sectional view showing a first embodiment of an adsorption tower according to the present invention. FIG. 2 is a side view of FIG. FIG. 3 is a graph showing the distribution of the amount of SO2 supported by the adsorption tower shown in FIG. FIG. 4 is a longitudinal sectional view, a side view, and an enlarged view of an essential part showing a second embodiment of the adsorption tower according to the present invention. FIG. 5 is a longitudinal sectional view, a side view, and an enlarged view of an essential part showing a third embodiment of the adsorption tower according to the present invention. FIG. 6 is an enlarged view of a main part showing a fourth embodiment of the adsorption tower according to the present invention. FIG. 7 is a longitudinal sectional view showing a fifth embodiment of the adsorption tower according to the present invention. FIG. 8 is a cross-sectional explanatory view of a saddle member that can be used in the adsorption tower according to the present invention. FIG. 9 is an explanatory cross-sectional view showing another example of a saddle member that can be used in the adsorption tower according to the present invention. FIG. 10 is an overall configuration diagram of a dry exhaust gas treatment apparatus in which the adsorption tower of the present invention is used. FIG. 11 is a longitudinal sectional view, a side view, a transverse sectional view, and a main part enlarged view showing a conventional adsorption tower. FIG. 12 is a longitudinal sectional view showing another example of a conventional adsorption tower. FIG. 13 is a graph showing the SO2 carrying amount distribution of the adsorption tower shown in FIG. FIG. 14 is a longitudinal sectional view showing still another example of a conventional adsorption tower. FIG. 15 is a diagram showing the SO2 carrying amount distribution of the adsorption tower shown in FIG.

Explanation of symbols

100, 100a to 100d Adsorption tower 101, 101a to 101d Supply part 102, 102a to 102d Contact part 103, 103a to 103d Cut part 104, 104a to 104d Exhaust port 106, 106a to 106d Exhaust gas inlet hood part 107, 107a to 107d Exhaust gas Outlet hood portion 108, 108a to 108d Exhaust gas supply path 109, 109a to 109d Exhaust gas discharge path 110, 110a to 110d Saddle member 111, 111a to 111d Gas flow path

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 show a first embodiment of an adsorption tower according to the present invention. The adsorption tower 100 shown in these figures is used in the dry exhaust gas treatment apparatus shown in FIG. 10 that adsorbs and removes harmful components in the exhaust gas A by the particulate adsorbent B.

Adsorption tower 100 is provided on the tower top side, supply port 101 that distributes and supplies granular adsorbent B, contact portion 102 that contacts exhaust gas A that is supplied while moving adsorbent B downward, It has the cut-out part 103 of the adsorbent B which was arrange | positioned at the bottom side, and adsorb | sucked waste gas A with the contact part 102, and the discharge port 104 of adsorbent B.

The contact portion 102 is a hollow cylindrical tower body 105 filled with the adsorbent B, and the adsorbent B flows downward in the contact portion 102. The adsorption tower 100 includes an exhaust gas inlet hood part 106 that sends the processing target exhaust gas A to the contact part 102, and an exhaust gas outlet hood part 107 that takes out the treated exhaust gas from the contact part 102.

In the contact portion 102, a plurality of exhaust gas supply passages 108 and a plurality of exhaust gas discharge passages 109 are provided that are arranged stepwise at predetermined intervals in the vertical direction. One end side of the exhaust gas supply path 108 communicates with the exhaust gas inlet hood portion 106, the other end side extends in the horizontal direction in the contact portion 102, and the end portion is closed with respect to the exhaust gas outlet hood portion 107. One end side of the exhaust gas discharge path 109 communicates with the exhaust gas outlet hood portion 107, the other end side extends horizontally in the contact portion 102, and the end portion is closed with respect to the exhaust gas inlet hood portion 106.

Each of the supply path 108 and the discharge path 109 is formed by disposing a saddle member 110 having substantially the same configuration. Note that the supply path 108 and the discharge path 109 do not necessarily need to use the saddle member 110 having the same shape, and it is possible to select different ones depending on the shapes in the saddle members shown in FIGS. In the case of the present embodiment, the saddle member 110 is composed of an inverted V-shaped member as shown in a cross-sectional shape in FIG. 2, and this is disposed in the contact portion 102. The saddle member 110 is installed so as to penetrate the contact portion 102 in the horizontal direction, and prevents the adsorbent B flowing downward from passing through the upper portion formed in an inverted V-shape, thereby preventing the saddle member 110 from passing laterally. The gas flow passage 111 is formed inside.
At this time, since the lower part of the saddle member 110 is opened, the adsorbent B accumulates in the lower part in the angle of repose from the left and right direction, so that the gas flow passage 111 is formed in this embodiment. As shown in FIG.

In the case of the present embodiment, the gas passage 111 is an exhaust gas supply path 108 and an exhaust gas discharge path 109, and the plurality of gas supply paths 108 are arranged at predetermined equal intervals on the same horizontal plane. The plurality of exhaust gas discharge paths 109 are also arranged at predetermined equal intervals on the same horizontal plane.

In the case of the present embodiment, the exhaust gas supply path 108 and the exhaust gas discharge path 109 are arranged in a plurality of stages at a predetermined interval in the vertical direction of the adsorption tower 100 and adjacent to each other in the vertical direction. The gas supply path 108 and the gas discharge path 109 are arranged in a staggered pattern.

In the case of this embodiment, a pair of exhaust gas discharge passages 109 are arranged with a predetermined interval in the vertical direction with respect to one exhaust gas supply passage 108. The exhaust gas A is introduced into the adsorption tower 100 having such a configuration. The exhaust gas A flows into the exhaust gas supply passages 108 through the inlet hood portion 106 and moves while contacting the adsorbent B in the contact portion 102.

Since the movement direction of the exhaust gas A at this time is prevented from moving directly upward by the saddle member 110, the exhaust gas A moves upward through the side of the saddle member 110 so as to circumvent this. In addition, the saddle member 110 moves downward through the downward opening of the saddle member 110.

As the exhaust gas A moves, the adsorbent B constantly flows downward in the contact portion 102. As a result, the adsorbent B flows on the upper side of the gas supply path 108. A counter flow region is formed in which the direction and the moving direction of the exhaust gas A in contact with the direction are opposite to each other. Further, on the lower side of the exhaust gas supply path 108, a parallel flow region is formed in which the flow direction of the adsorbent B and the movement direction of the exhaust gas A in contact therewith are parallel.

According to the adsorption tower 100 configured as described above, the exhaust gas A flows in a direction opposite to or parallel to the adsorbent B flowing downward, and as a result, as shown in FIG. In addition, similarly to the conventional example shown in FIG. 14, it becomes possible to uniformly carry harmful substances in the same plane along the flow direction of the exhaust gas, and the harmful substances in the exhaust gas can be effectively used as an adsorbent. So that the amount of adsorbent used can be minimized and the volume of the adsorption tower can be minimized.

Further, the exhaust gas supply passage 108 and the exhaust gas discharge passage 109 having such a function are installed so as to penetrate the contact portion 102 in the horizontal direction, and prevent the adsorbent B from permeating at the upper side to make it lateral. Since it is obtained by the saddle member 110 that pushes and forms the gas flow passage 111 inside, the entire structure is not complicated.

Further, the exhaust gas supply passage 108 and the exhaust gas discharge passage 109 are installed so as to penetrate the contact portion 102 in the horizontal direction, prevent the adsorbent B from passing therethrough and push it sideways, and the gas flow passage inside. For example, in the conventional example, a louver having different openings is used for the inlet louver and the outlet louver. Whereas it was impossible to reverse the flow direction of the exhaust gas as in the case, in this embodiment, even if the flow direction of the exhaust gas A passing through the adsorbent B is reversed, clogging or adsorption There will be no leakage of the material B.

In the case of the present embodiment, in the adsorption tower 100, the interval between the exhaust gas supply path 108 and the exhaust gas discharge path 109 can be set at different intervals between the upper part and the lower part of the adsorption tower 100. That is, in the upper part of the adsorption tower 100 where the adsorbent B is close to fresh, the interval between the exhaust gas supply path 108 and the exhaust gas discharge path 109 is reduced, and conversely, this interval is increased in the lower part of the adsorption tower where the loading amount of harmful substances increases. To do.

Since the pressure loss between the exhaust gas supply path 108 and the exhaust gas discharge path 109 is smaller in the upper part of the adsorption tower with a smaller interval than in the lower part of the adsorption tower, a larger amount of exhaust gas is processed in the upper part of the adsorption tower close to fresh. However, it is possible to reduce the amount of exhaust gas to be treated at the lower part of the adsorption tower where the loading amount of harmful substances is increased.

When the vertical interval between the exhaust gas supply path 108 and the exhaust gas discharge path 109 is equal, a zone of the adsorbent B that does not contribute to adsorption occurs in the upper part of the adsorption tower where the adsorbent B is close to fresh. As a result, it is possible to reduce the height of the adsorption tower 100 without reducing the performance of the adsorption tower even if the zones not contributing to the adsorption are reduced.

On the other hand, the adsorption tower 100 may require a person to enter the inside for the purpose of maintenance or the like. In such a case, the interval between the exhaust gas supply path 108 and the exhaust gas discharge path 109 cannot be made too small in the upper part of the adsorption tower. In general, the exhaust gas A contains dust, and the dust is captured while the exhaust gas A passes through the adsorbent layer.

At the upper part of the adsorption tower, the amount of captured dust is still small, but at the lower part of the adsorption tower, the amount of captured dust has increased, so the pressure loss of the adsorbent layer at the lower part of the adsorption tower is lower than the pressure loss at the upper part. The amount of exhaust gas passing tends to decrease. In the adsorption tower 100 of the present embodiment, such a request can be met.

FIG. 4 shows a second embodiment of the adsorption tower according to the present invention. The same or corresponding parts as those in the above embodiment are designated by the same reference numerals and the description thereof is omitted, and only the following characteristic points are shown. Detailed description.

The adsorption tower 100a shown in these drawings includes a supply port 101a, a contact portion 102a that makes contact with the exhaust gas A that is supplied while moving the adsorbent B downward, and an exhaust gas A that is disposed on the bottom side of the tower and is in contact with the contact portion 102a. The adsorbent B adsorbent B cut-out portion 103a and the adsorbent B discharge port 104a have an exhaust gas inlet hood portion 106a that feeds the exhaust gas A to be treated into the contact portion 102a, and the treated exhaust gas is taken out from the contact portion 102a. And an exhaust gas outlet hood 107a.

In the contact portion 102a, a plurality of exhaust gas supply passages 108a and a plurality of exhaust gas discharge passages 109a arranged in a step shape with a predetermined interval in the vertical direction are provided. The exhaust gas supply path 108a has one end communicating with the exhaust gas inlet hood portion 106a, the other end extending in the horizontal direction within the contact portion 102a, and the end portion closed with respect to the exhaust gas outlet hood portion 107a. One end side of the discharge passage 109a communicates with the exhaust gas outlet hood portion 107a, the other end side extends in the horizontal direction in the contact portion 102a, and the end portion is closed with respect to the exhaust gas inlet hood portion 106a. In the case of the present embodiment, the exhaust gas outlet hood part 107a is arranged on the same side as the exhaust gas inlet hood part 106a.

Each supply path 108a and discharge path 109a are formed by disposing saddle members 110a having substantially the same configuration. In this embodiment, the saddle member 110a has a cross-sectional shape as shown in FIG. As shown, the house-shaped member whose lower part is opened is arranged in the contact portion 102a. The saddle member 110a is installed so as to penetrate the contact portion 102a in the horizontal direction, and at the house-shaped roof portion (upper part), the permeation of the adsorbent B flowing downward is prevented and pushed sideways. A gas flow passage 111a is formed in Since the lower part of the saddle member 110a is opened as in the above-described embodiment, the adsorbent B accumulates in the lower portion in the angle of repose from the left-right direction, so that the gas flow passage 111a is formed in this embodiment. In this case, the cross-sectional shape shown in FIG.

Further, in the case of the present embodiment, the exhaust gas supply passages 108a and the discharge passages 109a are arranged in a plurality of stages so as to be alternately arranged in the vertical direction, and are arranged in a staggered manner at adjacent portions in the vertical direction. . Further, an intermediate partition plate 112a is provided in the contact portion 102a.
The intermediate partition plate 112a is opened at a through portion of the exhaust gas supply path 108a and the exhaust gas discharge path 109a, and supports the long exhaust gas supply path 108a and the exhaust gas discharge path 109a in the middle without disturbing the flow of the exhaust gas. be able to. When the intermediate partition plate 112a is closed at the penetrating portions of the exhaust gas supply passage 108a and the exhaust gas discharge passage 109a, the exhaust gas inlet hood portion 106a ′ (not shown) and the exhaust gas outlet hood (not shown) for taking out the treated exhaust gas from the contact portion 102a By providing the portion 107a ′ on the opposite side of 106a and 107a, the elongated exhaust gas supply path 108a and the exhaust gas discharge path 109a can be supported in the middle, and by supplying and discharging the exhaust gas from both sides, It becomes possible to reduce the flow velocity of the exhaust gas flowing through the exhaust gas supply path 108a and the exhaust gas discharge path 109a.

The adsorption tower 100a configured as described above can achieve the same operational effects as the above-described embodiment, and the hood portions 106a and 107a are arranged in the same direction, so that the compactness can be achieved. Moreover, since the supply path 108a and the discharge path 109a are arranged in a staggered manner, the contact state between the exhaust gas A and the adsorbent B is equalized, and harmful substances can be adsorbed efficiently.

FIG. 5 shows a third embodiment of the adsorption tower according to the present invention, where the same or corresponding parts as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted, and only the following characteristic points are shown. Detailed description.

The adsorption tower 100b shown in this figure includes a supply port 101b, a contact part 102b that makes contact with the exhaust gas A that is supplied while moving the adsorbent B downward, and an exhaust gas A that is disposed on the bottom side of the tower and is contacted with the contact part 102b. An exhaust gas inlet hood portion 106b having a cut-out portion 103b of the adsorbed adsorbent B and an exhaust port 104b of the adsorbent B, and sending the processing target exhaust gas A to the contact portion 102b, and an exhaust gas for extracting the treated exhaust gas from the contact portion 102b And an outlet hood portion 107b.

In the contact portion 102b, a plurality of exhaust gas supply passages 108b and a plurality of exhaust gas discharge passages 109b arranged in a step shape with a predetermined interval in the vertical direction are provided. The exhaust gas supply path 108b has one end communicating with the exhaust gas inlet hood portion 106b, the other end extending in the horizontal direction in the contact portion 102b, and the end portion closed with respect to the exhaust gas outlet hood portion 107b. One end side of the discharge passage 109b communicates with the exhaust gas outlet hood portion 107b, the other end side extends horizontally in the contact portion 102b, and the end portion is closed with respect to the exhaust gas inlet hood portion 106b.

Each supply path 108b and discharge path 109b are formed by disposing saddle members 110b having substantially the same configuration. In this embodiment, the saddle member 110b has a cross-sectional shape as shown in FIG. As shown, an inverted V-shaped member is disposed in the contact portion 102b.

The saddle member 110b is installed so as to penetrate the contact portion 102b in the horizontal direction. The saddle member 110b pushes the adsorbent B flowing downward at the upper portion of the inverted V shape and pushes it to the side. A flow passage 111b is formed. In the case of the present embodiment, the saddle members 110b are arranged such that those adjacent in the vertical direction are positioned on the same axis.

Since the saddle member 110b is open at the bottom as in the above embodiment, the adsorbent B accumulates in the lower portion from the left-right direction in the angle of repose, so that the gas flow passage 111b is formed in this embodiment. In this case, the cross-sectional shape shown in FIG. The adsorption tower 100b configured as described above can achieve the same operation and effect as the first embodiment.

FIG. 6 shows a fourth embodiment of the adsorption tower according to the present invention. The same or corresponding parts as those in the above embodiment are designated by the same reference numerals and the description thereof is omitted, and only the following characteristic points are shown. Detailed description.

In the embodiment shown in this figure, additional requirements are added to the second embodiment shown in FIG. 4, and the exhaust gas supply passage 108c has a gas passing through a portion communicating with the exhaust gas supply hood portion 106c. An adjustment plate 113c for adjusting the amount is movably disposed. A plurality of through holes 114c having the same shape as the cross-sectional shape of the exhaust gas supply passage 108c are formed in the adjustment plate 113c in the same state as the pitch of the supply passages 108c, and a portion that closes the exhaust gas supply passage 108c with the through holes 114c is formed. By changing, adjust the amount of gas passing through.

The adjustment plate 113c can be applied to the exhaust gas discharge path 109c instead of the exhaust gas supply path 108c, or can be installed in both of them.

In the conventional example shown in FIGS. 11 and 12, since the gas inflow area of the adsorbent layer cartridge is large, it is difficult to attach an adjustment plate for adjusting the exhaust gas flow rate at the upper and lower parts of the cartridge. In some cases it can be easily installed.

FIG. 7 shows a fifth embodiment of the adsorption tower according to the present invention. The same or corresponding parts as those in the above embodiment are designated by the same reference numerals and the description thereof is omitted, and only the following characteristic points are shown. Detailed description.

As shown in FIG. 7A, the adsorption tower 100d of this embodiment has a supply port 101d, a contact portion 102d that makes contact with the exhaust gas A supplied while moving the adsorbent B downward, and a tower bottom side. An exhaust gas inlet hood portion 106d having a cut-out portion 103d of the adsorbent B and an exhaust port 104d of the adsorbent B, which is disposed and adsorbs the exhaust gas A by the contact portion 102d, and sends the processing target exhaust gas A to the contact portion 102d; And an exhaust gas outlet hood part 107d for taking out the treated exhaust gas from the exhaust gas.

A pair of switching valves 115d are connected to the exhaust gas inlet hood portion 106d and the exhaust gas outlet hood portion 107d, respectively. In the steady state, the switching valve 115d is open on the white side and closed on the black side, as shown in FIG. 7A, and the exhaust gas A is supplied to the inlet hood portion 106d side.

On the other hand, when the switching valve 115d is operated to close the white side and the black side is opened, the exhaust gas A is supplied to the exhaust gas outlet hood portion 107d side as shown in FIG.

Such switching operation is effective in the following cases. That is, the exhaust gas A may contain a substance with strong adhesion. For example, NH3 is injected into the exhaust gas containing SO2 or SO3, and in this case, both of them react with each other. The produced ammonium sulfate or acidic ammonium sulfate may adhere to the inlet louver of the adsorption tower and hinder the inflow of exhaust gas.

In such a case, if it is possible to reverse the flow of the exhaust gas A so that the exhaust gas can flow from the outlet louver side to the inlet louver side, the deposit on the inlet louver side is sublimated and removed, It is possible to recover the flow of exhaust gas.

However, in the conventional example shown in FIGS. 11 and 12, since a porous plate or the like having a small opening is used for the outlet louver, if the flow of exhaust gas is reversed, the outlet louver side is also blocked. Operation could not be performed.

In the adsorption tower of the present invention, the exhaust gas inlet saddle and the exhaust gas outlet saddle are alternately arranged in the vertical direction, and the exhaust gas inlet saddle and the exhaust gas outlet saddle have the same shape, so the flow of the exhaust gas freely in the adsorbent No problem occurs even if the direction is reversed.

As a method for reversing the flow direction of the exhaust gas, in addition to the method shown in FIG. 7, the movable slit-equipped adjustment plate 113 c shown in FIG. 6 is replaced by both ends of the exhaust gas inlet saddle 106 and both ends of the exhaust gas outlet saddle 107. It becomes possible by opening and closing them. It is also possible to install switching means in the exhaust gas inlet duct connected to the adsorption tower, the exhaust gas outlet duct, and the connection duct of the exhaust gas inlet duct and the exhaust gas outlet duct, respectively.

When the flow direction of the exhaust gas is reversed, the exhaust gas after being treated with the adsorbent flows into the exhaust gas inlet saddle, so that the deposit on the exhaust gas inlet saddle is gradually sublimated and removed.

FIG. 8 shows a modification of the saddle member that can be employed in the adsorption tower according to the present invention. The saddle members 110e to 110k shown in these drawings only need to be able to form a gas flow passage inside by blocking the permeation of the adsorbent B at the upper part and pushing it sideways.

Other than the shape shown in the above embodiment, the shape may be a quadrangle 110e having an open portion at the bottom, a pentagon, a semicircle 110f, a half ellipse 110g, or the like. In particular, in the case of the rectangular shape 110e, there is an advantage that the adsorbent B is deposited on the upper portion and wear of the saddle member due to the flow of the adsorbent is reduced.

Also, the pores 110h to k can be opened in the side surface or the entire surface such as a triangle, a quadrangle, a pentagon, a semicircle, and a semi-elliptical shape. Furthermore, the saddle can be formed with a fine louver-like structure. This makes it possible to reduce pressure loss when the exhaust gas A flows out into the adsorbent layer or when the exhaust gas A flows into the inside. The size of the pores and the opening of the louver are set so that the adsorbent particles do not flow into the saddle through the pores.

FIG. 9 shows a modification of the saddle member that can be employed in the adsorption tower according to the present invention. The saddle members 110l to 110n shown in these figures only need to be able to form a gas flow passage inside by blocking the permeation of the adsorbent B at the top and pushing it sideways. The cross-sectional shape is closed. The saddle member 110l has a circular cross section and is provided with pores below. The saddle member 110m is an elliptical cross section and has pores provided at the upper and lower ends. The saddle member 110n has a combination of an inverted V shape and a circular arc.

In the adsorption tower of the present invention, when the exhaust gas that has passed through the adsorbent layer flows into the exhaust gas discharge path, the adsorbent particles receive a force in the upward direction. At this time, the powdered adsorbent having a small particle diameter and the dust in the exhaust gas captured in the adsorbent may be accompanied by the exhaust gas flowing in the discharge path.

In the adsorption tower of the present invention, in order to reduce this entrainment phenomenon, the cross-sectional area in which the exhaust gas flows inside the exhaust gas discharge path is made larger than the cross-sectional area in which the exhaust gas flows in the exhaust gas supply path. Since it is possible to reduce the gas flow rate inside and reduce entrainment of dust and the like, it is preferable to adopt such a configuration.

The adsorption tower according to the present invention can be effectively utilized in a dry exhaust gas treatment apparatus, because harmful substances in the exhaust gas can be adsorbed (supported) to the adsorbent as much as possible while avoiding complication of the configuration. it can.

Claims

A granular adsorbent supply port provided on the tower top side, a contact part that contacts the exhaust gas supplied while moving the adsorbent downward, and an adsorbent that adsorbs the exhaust gas at the contact part disposed on the tower bottom side An exhaust gas inlet hood part that feeds the exhaust gas to be treated to the contact part, and an exhaust gas outlet hood part that takes out the treated exhaust gas from the contact part, In an adsorption tower used in a dry exhaust gas treatment device that adsorbs and removes harmful components in exhaust gas with a granular adsorbent,
One end side communicates with the exhaust gas inlet hood portion, the other end side extends in the horizontal direction in the contact portion, and a plurality of exhaust gas supply paths whose ends are closed with respect to the exhaust gas outlet hood portion;
One end side communicates with the exhaust gas outlet hood portion, the other end side extends in the horizontal direction in the contact portion, and has a plurality of exhaust gas discharge passages whose ends are closed with respect to the exhaust gas inlet hood portion,
The adsorbent is prevented from permeating at the upper part and pushed sideways, and a saddle member that forms a gas flow passage is installed in the contact portion so as to penetrate horizontally, and the gas passage is disposed in the exhaust gas. As a supply channel and exhaust gas discharge channel,
The adsorption tower, wherein the plurality of exhaust gas supply passages and the plurality of exhaust gas discharge passages are arranged at predetermined intervals on a horizontal plane at predetermined intervals in the vertical direction.
A pair of the exhaust gas discharge passages are arranged at intervals in the vertical direction of the exhaust gas supply passage, and the flow direction of the adsorbent and the movement direction of the exhaust gas in contact therewith are opposed above the gas supply passage. The counterflow area | region which carries out, and the parallel flow area | region where the flow direction of the said adsorbent and the movement direction of the waste gas which contacts this are parallel are provided in the downward side of the said waste gas supply path. Adsorption tower.
3. The adsorption tower according to claim 1, wherein a plurality of the exhaust gas supply passages and the exhaust gas discharge passages are disposed so as to be adjacent to each other at a predetermined interval in the horizontal direction within the same horizontal plane.
The exhaust gas supply path and the exhaust gas discharge path are arranged in a plurality of stages at a predetermined interval in the vertical direction in the vertical direction of the adsorption tower, and are adjacent to the gas supply path and the gas exhaust in the vertical direction. The adsorption tower according to any one of claims 1 to 3, wherein the paths are arranged in a staggered pattern.
The adsorption tower according to any one of claims 1 to 4, wherein when the counterflow region and the parallel flow region are arranged in a step shape, the volume of the adsorption contribution zone is changed. .
The exhaust gas supply passage and the exhaust gas discharge passage are movable in either or both of the exhaust gas supply hood portion and the portion communicating with the exhaust gas discharge hood portion, or an adjustment plate for adjusting the amount of gas passing therethrough. The adsorption tower according to claim 1, wherein the adsorption tower is arranged.
The exhaust gas supply path and the exhaust gas discharge path are in a steady state in which the exhaust gas permeates from the exhaust gas supply path to the exhaust gas discharge path by a switching operation of a switching valve disposed outside, and the exhaust gas from the exhaust gas discharge path. The adsorption tower according to any one of claims 1 to 4, wherein the adsorption tower is in a reverse flow state that permeates through the exhaust gas supply path.
The adsorption tower according to any one of claims 1 to 7, wherein the saddle member is provided with a through-hole through which the exhaust gas can permeate.
8. The adsorption tower according to claim 1, wherein the saddle member is provided with a louver on a side portion thereof that allows the exhaust gas to pass therethrough and prevents the adsorbent from passing therethrough.