JP7371142B2 - Denitrification equipment, boiler, and installation method of denitrification equipment - Google Patents

Description

The present disclosure relates to a denitrification device, a boiler, and a method for installing the denitrification device.

A large boiler such as a power generation boiler has a hollow furnace installed vertically, and a plurality of burners are arranged along the circumferential direction of the furnace wall. Further, in a large boiler, a flue is connected vertically above the furnace, and a heat exchanger for generating steam is disposed in the flue. A flame is formed by the burner injecting a mixture of fuel and air (oxidizing gas) into the furnace, and combustion gas is generated and flows into the flue. A heat exchanger is installed in a region where combustion gas flows, and superheated steam is generated by heating water or steam flowing through heat transfer tubes that make up the heat exchanger. Furthermore, a denitrification device including a denitrification catalyst is installed downstream of the heat exchanger in the flue in order to remove nitrogen oxides (NOx) from the combustion gas.

The catalyst packs installed in the catalyst layer in the denitrification reactor, which forms the outer shell of the denitrification device, have gaps between adjacent catalyst packs and between the catalyst packs and the inner surface of the denitrification reactor. Combustion gas may make a short pass (flow to the downstream side of the denitrification device without passing through the catalyst pack) through this gap. In order to suppress short paths of combustion gas, a structure is known in which a closing plate is provided to close gaps formed between catalyst packs (for example, Patent Document 1).

Patent Document 1 describes a catalytic reactor having a reactor duct, a beam, a catalyst block, etc. In this catalytic reactor, beams are stretched horizontally within a reactor duct, and a catalyst block is spanned between and supported by the two beams. The catalyst block is constructed by incorporating at least one catalyst unit into a frame-shaped case. In the reactor duct, a plurality of catalyst blocks are installed in a row in the reactor duct such that the front and rear surfaces of the frame-like case face each other and are adjacent to each other, and the right and left sides of the frame-like case face and adjoin each other. There is. The catalyst unit included in the catalyst block is, for example, one in which a catalyst body is housed in a frame. Further, the catalyst body contains a component that activates the denitrification reaction, and has a shape such as a lattice shape, a honeycomb shape, a corrugated board shape, or a plate shape. Moreover, since the catalyst block is spanned so that the front or rear surface is parallel to the beam, a sealing member is attached to the lower part (preferably the lower end) of the right side surface of the frame-shaped case. The sealing member seals the lower part of the gap between the right side and left side when the catalyst blocks are arranged side by side in the reactor duct. By providing the seal member, it is possible to reduce the amount of combustion exhaust gas that passes through the gaps between the catalyst blocks without passing through the catalyst layer.

Japanese Patent Application Publication No. 2021-122800

In recent years, boilers that use hydrogen or ammonia as fuel have been attracting attention from the perspective of reducing greenhouse gas emissions. However, when using hydrogen or ammonia as fuel, it is expected that the amount of NOx (nitrogen oxides) generated will be significantly greater than when using conventional fuels such as coal. Therefore, in order to reduce NOx emissions in a boiler that uses hydrogen or ammonia as fuel, it is necessary to more strictly suppress short paths of combustion gas. From this point of view, a technology is desired that more effectively suppresses the short path of combustion gas.
In the boiler described in Patent Document 1, a sealing member is provided, but a gap is formed between the longitudinal end of the sealing member and the beam. There was a possibility that the combustion gas would make a short pass through this gap, and there was a possibility that the short pass could not be sufficiently suppressed.

The present disclosure has been made in view of these circumstances, and is intended to reduce the amount of combustion gas (so-called short-pass combustion gas) that flows downstream of the denitration catalyst without passing through the inside of the catalyst pack (denitration catalyst). It is an object of the present invention to provide a denitrification device, a boiler, and a method for installing a denitrification device that can reduce the amount of denitrification.

In order to solve the above problems, a denitrification device, a boiler, and a method for installing the denitration device according to the present disclosure employ the following means.
A denitrification device according to an aspect of the present disclosure includes a plurality of support beams that extend in a predetermined direction and are arranged at predetermined intervals in a cross direction that intersects with the predetermined direction; a denitrification catalyst that is placed on the plurality of support beams so as to bridge the support beams and denitrates the gas passing therethrough; a first sealing member that seals a gap formed between the members adjacent in the predetermined direction; and a first sealing member that seals a gap formed between the end of the first sealing member in the cross direction and the support beam. a second sealing member, and a packing sandwiched between the lower surface and the upper surface of the support beam is attached to an end of the lower surface of the denitrification catalyst in the cross direction.

Further, a method for installing a denitrification device according to an aspect of the present disclosure is a method for installing a denitrification device that denitrates gas, wherein the denitrification device extends in a predetermined direction and intersects with the predetermined direction. A plurality of support beams arranged in a line at a predetermined interval in the cross direction, and a gas that is placed on the plurality of support beams and passes through the inside so as to construct the support beams arranged in the cross direction. a first seal member extending in the cross direction and sealing a gap formed between the denitrification catalyst and a member adjacent to the denitrification catalyst in the predetermined direction; a second seal member that seals a gap formed between the end of the seal member in the cross direction and the support beam; A packing is attached to be sandwiched between the upper surface of the support beam, and the second seal member covers a gap formed between the end of the first seal member in the cross direction and the support beam. The method includes a step of placing the denitrification catalyst on the support beam.

According to the present disclosure, it is possible to reduce the amount of gas flowing downstream of the denitrification catalyst without passing through the inside of the denitrification catalyst.

FIG. 1 is a schematic configuration diagram showing a boiler according to a first embodiment of the present disclosure. FIG. 1 is a perspective view showing main parts of a denitrification device according to a first embodiment of the present disclosure. FIG. 1 is a perspective view showing a catalyst pack according to a first embodiment of the present disclosure. 1 is a schematic side view showing a method for manufacturing a denitrification device according to a first embodiment of the present disclosure. 1 is a schematic side view showing a method for manufacturing a denitrification device according to a first embodiment of the present disclosure. 1 is a schematic perspective view showing a method for manufacturing a denitrification device according to a first embodiment of the present disclosure. FIG. 2 is a perspective view showing main parts of a denitrification device according to a second embodiment of the present disclosure. 8 is an enlarged view of the main part (XIII portion) of FIG. 7. FIG. 8 is an enlarged view of the main part (IX portion) of FIG. 7. FIG. FIG. 9 is a sectional view taken along the line XX in FIG. 9;

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a denitrification device, a boiler, and a method for installing a denitrification device according to the present disclosure will be described below with reference to the drawings. Note that, hereinafter, the up-down direction will be referred to as the Z-axis direction. Furthermore, the direction in which the support beam extends in the horizontal direction is referred to as the Y-axis direction. Further, a direction perpendicular to the Z-axis direction and the Y-axis direction is referred to as the X-axis direction.

[First embodiment]
A first embodiment of the present disclosure will be described below with reference to the drawings. It should be noted that the present invention is not limited to this embodiment, and if there are multiple embodiments, the present invention may be configured by combining each embodiment. In the following description, the term "above" or "upper" refers to the upper side in the vertical direction, and "lower" or "lower" refers to the lower side in the vertical direction, and the vertical direction is not exact and includes errors.

FIG. 1 is a schematic configuration diagram showing the boiler of this embodiment.

The boiler 10 of this embodiment is a boiler that can generate superheated steam by combusting fuel with a burner 21 and exchanging the heat generated by this combustion with feed water and steam.

The boiler 10 has a furnace 11, a combustion device 20, and a combustion gas passage 12. The furnace 11 has a hollow rectangular tube shape and is installed along the vertical direction. Furnace wall 101, which constitutes the inner wall surface of furnace 11, is composed of a plurality of heat exchanger tubes and fins that connect the heat exchanger tubes, and transfers heat generated by combustion of pulverized fuel to water or water flowing inside the heat exchanger tubes. In addition to recovering heat by exchanging heat with steam, the temperature rise of the furnace wall 101 is suppressed.

Combustion device 20 is installed in the lower region of furnace 11 . In the present embodiment, the combustion device 20 includes a plurality of burners 21A, 21B, 21C, 21D, 21E, and 21F (hereinafter sometimes collectively referred to as "burners 21") attached to the furnace wall 101. have. The burners 21 are arranged at equal intervals along the circumferential direction of the furnace 11 (for example, four burners installed at each corner of the rectangular furnace 11) as one set, and are arranged in multiple stages along the vertical direction. It is located. In addition, in FIG. 1, for convenience of illustration, only two of the burners in one set are shown, and each set is labeled with 21A, 21B, 21C, 21D, 21E, and 21F. The shape of the furnace, the number of stages of burners, the number of burners in one stage, the arrangement of burners, etc. are not limited to this embodiment.

A wind box (air register) 23 is provided on the outside of the furnace 11 at the mounting position of the burner 21, and one end portion of an air passage (air duct) 24 is connected to this wind box 23. A forced draft fan (FDF) 32 is connected to the other end of the air passage 24 . The air supplied from the forced draft fan 32 is heated by an air preheater 42 installed in the air passage 24 (details will be described later), and is sent to the burner 21 as combustion air (oxidizing gas) via the wind box 23. The fuel is supplied and put into the furnace 11.

The combustion gas passage 12 is connected to the upper part of the furnace 11 in the vertical direction. The combustion gas passage 12 includes superheaters 102A, 102B, and 102C (hereinafter sometimes collectively referred to as "superheaters 102"), reheaters as heat exchangers for recovering the heat of the combustion gas. 103A, 103B (hereinafter, may be collectively referred to as "reheater 103"), and an economizer 104 are provided, and the combustion gas generated in the furnace 11 and the inside of each heat exchanger are Heat exchange takes place with the circulating feed water and steam. Note that the arrangement and shape of each heat exchanger are not limited to the form shown in FIG. 1.

A flue 13 is connected to the downstream side of the combustion gas passage 12, through which the combustion gas whose heat has been recovered by the heat exchanger is discharged. An air preheater (air heater) 42 is provided between the flue 13 and the wind duct 24, and heat exchange is performed between the air flowing through the wind duct 24 and the combustion gas flowing through the flue 13. By heating the combustion air supplied to the burner 21, heat is further recovered from the combustion gas after heat exchange with water and steam.

Further, a denitrification device 43 may be provided in the flue 13 at a position upstream of the air preheater 42. The denitrification device 43 supplies a reducing agent, such as ammonia or urea water, which has the effect of reducing nitrogen oxides to the combustion gas flowing through the flue 13, and removes nitrogen oxides from the combustion gas to which the reducing agent has been supplied. By promoting the reaction between (NOx) and the reducing agent by the catalytic action of the denitrification catalyst installed in the denitrification device 43, nitrogen oxides in the combustion gas are removed and reduced.
A gas duct 41 is connected to the flue 13 downstream of the air preheater 42 . The gas duct 41 includes environmental devices such as a dust collector 44 such as an electrostatic precipitator that removes ash from the combustion gas, and a desulfurization device 46 that removes sulfur oxides, as well as environmental devices for guiding the exhaust gas to these environmental devices. An induced draft fan (IDF) 45 is provided. The downstream end of the gas duct 41 is connected to a chimney 47, and the combustion gas treated by the environmental device is discharged outside the system as exhaust gas.

Fuel is supplied to the burner 21 via a fuel supply pipe (not shown), and combustion air heated by an air preheater 42 is supplied from the air passage 24 via the wind box 23. Burner 21 blows fuel and combustion air into furnace 11 . The fuel blown into the furnace 11 is ignited to form a flame. A flame is formed in the lower region within the furnace 11 and hot combustion gases rise within the furnace 11 and flow into the combustion gas passage 12 . Note that in this embodiment, air is used as the combustion air (oxidizing gas), but it may have a higher or lower oxygen content than air, and the ratio of the amount of oxygen to the amount of fuel supplied may be Stable combustion is achieved in the furnace 11 by adjusting the range to an appropriate range.

The combustion gas flowing into the combustion gas passage 12 exchanges heat with water and steam in the superheater 102, reheater 103, and economizer 104 arranged inside the combustion gas passage 12, and then is discharged into the flue 13. Nitrogen oxides are removed in a denitrification device 43, and after heat exchange with primary air and secondary air in an air preheater 42, they are further discharged to a gas duct 41, ash etc. are removed in a dust collector 44, and a desulfurization device 46 After the sulfur oxides are removed, they are discharged from the chimney 47 to the outside of the system. Note that the arrangement of each heat exchanger in the combustion gas passage 12 and each device from the flue 13 to the gas duct 41 does not necessarily have to be arranged in the above-described order with respect to the combustion gas flow.

Next, details of the denitrification device 43 according to this embodiment will be explained using FIGS. 1 to 6.

As shown in FIG. 1, a denitrification device 43 is provided in the middle of a portion of the flue 13 extending in the Z-axis direction (hereinafter referred to as "vertical portion 13a"). That is, in the denitrification device 43, combustion gas flows along the Z-axis direction. More specifically, combustion gas flows from above to below.

As shown in FIG. 2, the denitration device 43 includes a reactor 50 forming an outer shell, a plurality of catalyst packs (denitrification catalysts) 51 provided inside the reactor 50, and A plurality of extending support beams 52 are provided.
The denitrification device 43 also includes a first seal member 53 fixed to the lower end of the end surface of the catalyst pack 51 in the Y-axis direction (predetermined direction), an end of the first seal member 53 in the X-axis direction, and a support beam 52. and a second sealing member 54 that seals the gap formed between the two.
Further, the denitrification device 43 includes a pair of rails 55 extending in the Y-axis direction. The rail 55 is used when carrying the catalyst pack 51 into the reactor 50. Further, the denitrification device 43 includes a reinforcing member 56 fixed along the inner peripheral surface of the reactor 50.

As shown in FIG. 2, the reactor 50 is a rectangular cylindrical member with open upper and lower ends. The opening at the upper end of the reactor 50 is connected to the flue 13 on the upstream side, and the opening at the lower end is connected to the flue 13 on the downstream side. The combustion gas that has flowed into the interior of the reactor 50 through the opening at the upper end flows downward within the reactor 50 and flows out through the opening at the lower end.

Furthermore, a plurality of catalyst packs 51 are housed inside the reactor 50. The combustion gas flowing in the reactor 50 passes through the catalyst pack 51 . The catalyst pack 51 reduces and removes (denitrates) at least a portion of nitrogen oxides in the combustion gas passing therethrough. Details of the catalyst pack 51 will be described later.

The support beam 52 extends in the Y-axis direction, and both ends in the Y-axis direction are fixed to the inner peripheral surface of the reactor 50. The support beam 52 is an elongated member whose cross section when cut along a plane orthogonal to the Y-axis direction is approximately H-shaped or approximately C-shaped. The plurality of support beams 52 are arranged along the X-axis direction at predetermined intervals. Further, the plurality of support beams 52 are arranged in a line at predetermined intervals along the Z-axis direction so as to form a plurality of stages. The support beam 52 provided at the lowest stage is arranged at the lower end of the reactor 50.

The upper surface of the support beam 52 is flat. A catalyst pack 51 is placed on the upper surface of this support beam 52.
Furthermore, a positioning metal fitting 52a projecting upward is fixed to the upper surface of the support beam 52 by, for example, welding. The positioning hardware 52a is fixed to the upper surface of the support beam 52 at approximately the center in the X-axis direction, and is used for positioning the catalyst pack 51.

As shown in FIG. 2, the plurality of catalyst packs 51 are arranged side by side so as to cover substantially the entire flow path cross section (cross section formed by the X-axis direction and the Y-axis direction) of the reactor 50. In this embodiment, a plurality of catalyst packs 51 are provided in the Y-axis direction and a plurality of catalyst packs 51 are provided in the X-axis direction.
Further, the plurality of catalyst packs 51 are also arranged in line at predetermined intervals in the Z-axis direction, and constitute a plurality of catalyst layers. In FIG. 2, only a part of one layer among the plurality of catalyst packs 51 is illustrated.
Since the structure of each catalyst pack 51 is the same, the structure of one catalyst pack 51 will be described below as a representative.

The catalyst pack 51 is placed on the upper surface of the support beams 52 so as to bridge the support beams 52 adjacent to each other in the X-axis direction. That is, the catalyst pack 51 is placed on the upper surface of the support beam 52 so as to straddle between the two support beams 52 . Specifically, the catalyst pack 51 is placed on the upper surface of the support beam 52 via a packing 57 that will be described later.

The catalyst pack 51 includes, for example, a rectangular cylindrical rectangular frame (not shown) and a plurality of catalysts (not shown) provided inside the rectangular frame. The catalyst has a so-called honeycomb shape. Note that the shape of the catalyst is not limited to the honeycomb shape. The catalyst pack 51 promotes a reduction reaction of NOx (nitrogen oxides) contained in the combustion gas passing therethrough, and removes at least a portion of the NOx.

As shown in FIG. 3, a packing 57 is attached to the lower surface of the catalyst pack 51. The packing 57 is attached to the outer peripheral portion of the lower surface of the catalyst pack 51. Specifically, it is attached along three sides of the outer periphery of the lower surface of the catalyst pack 51, and is not attached to one side located at the end in the Y-axis direction.
The packing 57 is sandwiched between the lower surface of the catalyst pack 51 and the upper surface of the support beam 52. The packing 57 is made of a material that deforms due to the weight of the catalyst pack 51. By placing the catalyst pack 51 on the upper surface of the support beam 52, the lower surface of the rectangular frame of the catalyst pack 51 and the upper surface of the support beam 52 It transforms to fill the gap between.

Further, a first seal member 53 is fixed to the lower end of the catalyst pack 51 in the Y-axis direction. Specifically, the first seal member 53 is provided along one side of the outer peripheral portion of the lower surface of the catalyst pack 51 where the packing 57 is not attached.

The first seal member 53 is made of a metal material. The first sealing member 53 has a plate-shaped first plate portion 53a that is in surface contact with the lower end of the end face of the catalyst pack 51 on one side in the Y-axis direction and is fixed, and is approximately perpendicular to the lower end of the first plate portion 53a. It integrally includes a plate-shaped second plate portion 53b that is bent and extends to one side in the Y-axis direction (the front side in the carrying direction when carrying the catalyst pack 51 into the reactor 50). The first seal member 53 has a substantially L-shaped cross section when cut along a plane perpendicular to the X-axis direction. The first plate portion 53a and the catalyst pack 51 are fixed with bolts or the like, for example.
The first seal member 53 is provided over substantially the entire area of the catalyst pack 51 in the X-axis direction. Specifically, the first sealing member 53 has a length comparable to the distance between two support beams 52 adjacent to each other in the X-axis direction, and is provided except for both ends of the catalyst pack 51 in the X-axis direction. . A gap S2 (see FIG. 6) is formed between both ends of the first seal member 53 in the X-axis direction and the support beam 52.

The first seal member 53 extends in the cross direction and seals a gap formed between the members arranged adjacent to each other in the Y-axis direction (hereinafter referred to as "adjacent members in the Y-axis direction"). do. Examples of the adjacent members in the Y-axis direction include the catalyst pack 51 and the reactor 50 that are adjacent in the Y-axis direction.
In this embodiment, a case will be described in which catalyst packs 51 are adjacent to each other in the Y-axis direction. The first seal member 53 seals a gap S1 (see FIG. 5) formed between the catalyst packs 51. That is, the flow of combustion gas attempting to pass through the gap S1 is blocked by the second plate portion 53b. In this way, the first seal member 53 seals the gap S1.
As shown in FIG. 5, adjacent catalyst packs 51 are placed on the upper surface of the second plate portion 53b.

As shown in FIG. 6, the second seal member 54 is a flat member made of a metal material. As shown in FIGS. 2 and 6, the second seal member 54 covers a gap S2 formed between both ends of the first seal member 53 in the X-axis direction and the support beam 52 from above. That is, the second seal member 54 seals the gap S2.

The second seal member 54 has a notch 54a formed at the inner end in the X-axis direction (inner side of the catalyst pack 51) and on the other side in the Y-axis direction (inner side in the conveyance direction). That is, the second seal member 54 has a closing portion 54b provided on the outside in the X-axis direction (outside the catalyst pack 51), and a length in the Y-axis direction that is shorter than that of the closing portion 54b provided on the inside in the X-axis direction. It integrally has an overlapping portion 54c.

The second seal member 54 is provided on one side of the catalyst pack 51 in the Y-axis direction and at both ends in the X-axis direction. As shown in FIG. 5, the overlapping portion 54c is provided so as to overlap the upper surface of the second plate portion 53b of the first sealing member 53. As shown in FIG. On the other hand, the closing part 54b is provided outside the first seal member 53 in the X-axis direction, covers and closes the gap S2 from above, and has an outer end in the X-axis direction resting on the upper surface of the support beam 52. At the same time, the catalyst pack 51 is placed on at least a portion of the upper surface. That is, the outer end of the closing portion 54b is sandwiched between the support beam 52 and the catalyst pack 51 (specifically, the packing 57).

Next, a method for installing the denitrification device 43 according to this embodiment will be explained.
First, a catalyst pack 51 is manufactured at a factory. Next, the packing 57 and the first seal member 53 are attached to the catalyst pack 51 at a factory. Note that the first seal member 53 does not need to be installed at a factory, and may be installed at the site (at a location where the denitrification device 43 is installed at a power plant, etc.).
Next, the catalyst pack 51 with the packing 57 and the first seal member 53 attached is transported to the site.

Next, the catalyst pack 51 is carried into the reactor 50. At this time, the support beam 52 is already fixed within the reactor 50. The catalyst pack 51 is carried in on a truck equipped with wheels that engage with the rails 55. When carrying in the catalyst pack 51, as shown in FIGS. 3 and 4, the catalyst pack 51 is carried in with the side where the first seal member 53 is provided facing toward you. When the catalyst pack 51 is carried to a predetermined position, the catalyst pack 51 is lowered from the truck and placed on the upper surface of the support beam 52. At this time, the catalyst pack 51 is placed while the second seal member 54 is placed at a predetermined position. Specifically, the overlapping portion 54c of the second seal member 54 is placed on the upper surface of the second plate portion 53b of the first seal member 53, and the closing portion 54b is a packing attached to the lower surface of the catalyst pack 51. The catalyst pack 51 is placed on the upper surface of the support beam 52 with the second seal member 54 disposed below the support beam 57 (see FIG. 6).

When the first catalyst pack 51 is carried in, next the second catalyst pack 51 (the catalyst pack 51 adjacent to the first catalyst pack 51 in the Y-axis direction) is carried in. When installing the second catalyst pack 51 in a predetermined position, the second catalyst pack 51 is attached to the first seal member 53 of the first catalyst pack 51, as shown in FIGS. Install it so that it is placed on the top surface. (See FIGS. 5(a) and 5(b)).
In this way, the denitrification device 43 is installed.

According to this embodiment, the following effects are achieved.
In this embodiment, a packing 57 that is sandwiched between the lower surface of the catalyst pack 51 and the upper surface of the support beam 52 is attached to the end of the lower surface of the catalyst pack 51 in the X-axis direction. As a result, a gap (hereinafter referred to as "adjacent member in the X-axis direction") is formed between the catalyst pack 51 and a member adjacent to the catalyst pack 51 in the X-axis direction (hereinafter referred to as "adjacent member in the X-axis direction"). ) is sealed by the packing 57 and the support beam 52. Further, in this embodiment, a first seal member 53 is provided. As a result, a gap S1 (hereinafter referred to as "adjacent member in the Y-axis direction") is formed between the catalyst pack 51 and an adjacent member adjacent to the catalyst pack 51 in the Y-axis direction (hereinafter referred to as "adjacent member in the Y-axis direction"). ) is sealed by the first seal member 53. In this way, since the gap in the X-axis direction and the gap in the Y-axis direction can be sealed, the combustion gas that flows downstream of the catalyst pack 51 without passing through the inside of the catalyst pack 51 (so-called short-pass combustion) can be sealed. gas) can be reduced.

Further, in this embodiment, a second seal member 54 is further provided. Thereby, the gap S2 formed between the end of the first seal member 53 in the X-axis direction and the support beam 52 can also be sealed by the second seal member 54. Therefore, short-pass combustion gas can be further reduced.

Further, in this embodiment, a packing 57 is attached to the catalyst pack 51. Thereby, the catalyst pack 51 can be transported with the packing 57 attached to the catalyst pack 51. Therefore, for example, if the packing 57 is attached to the catalyst pack 51 at the factory and the catalyst pack 51 is transported to the site with the packing 57 attached, the step of attaching the packing 57 to the catalyst pack 51 at the site can be omitted. can. Therefore, the number of on-site assembly steps can be reduced, and the on-site construction process can be shortened. Furthermore, since the packing 57 can be installed at a factory with better facilities and equipment than at the site, variations in quality can be suppressed, and reliability can be improved.

Further, in this embodiment, the packing 57 is attached to the lower surface of the catalyst pack 51 and is sandwiched between the lower surface of the catalyst pack 51 and the upper surface of the support beam 52. Thereby, the packing 57 can be pressed by the weight of the catalyst pack 51. Therefore, the parts that press the packing 57 can be omitted, so the number of parts can be reduced.

In this embodiment, the first sealing member 53 is attached to the lower end of the catalyst pack 51 on one side in the Y-axis direction (the front side in the carrying direction when the catalyst pack 51 is carried into the reactor 50). Thereby, the catalyst pack 51 can be transported with the first seal member 53 attached to the catalyst pack 51. Therefore, for example, if the first seal member 53 is attached to the catalyst pack 51 at the factory and the catalyst pack 51 is transported to the site with the first seal member 53 attached, the first seal member 53 is attached to the catalyst pack at the site. 51 can be omitted. Therefore, the number of on-site assembly steps can be reduced, and the on-site construction process can be shortened. Further, since the first seal member 53 can be installed at a factory where facilities and devices are better equipped than at the site, variations in quality can be suppressed, and reliability can be improved.

In this embodiment, the first sealing member 53 includes a first plate portion 53a and a second plate portion 53b that bends and extends from the end of the first plate portion 53a. That is, the first seal member 53 has a substantially L-shaped cross section when cut along a plane perpendicular to the X-axis direction. Thereby, adjacent members in the Y-axis direction can be placed on the upper surface of the second plate portion 53b. Therefore, since the cross section of the gap in the Y-axis direction when cut along a plane orthogonal to the X-axis direction is approximately L-shaped, it becomes more difficult for combustion gas to pass through. Therefore, the sealing performance of the gap in the Y-axis direction can be further improved.

Further, in this embodiment, the first plate portion 53a is in surface contact with the end surface of the catalyst pack 51 and is fixed. The sealing performance of the gap formed between the first plate portion 53a and the catalyst pack 51 can be improved, and the first seal member 53 can be firmly fixed to the catalyst pack 51.

[Second embodiment]
Next, a second embodiment of the present disclosure will be described using FIGS. 7 to 10.
This embodiment differs from the first embodiment in that the support beams are provided in a grid pattern. Furthermore, the seal structure of the catalyst pack is different from the first embodiment. Components similar to those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the catalyst pack 151 of this embodiment, packings 57 are attached to all four sides of the lower surface. Further, the first seal member 53 described in the first embodiment is not attached to the catalyst pack 151.
The support beam 152 according to this embodiment includes a first support beam 152a extending along the Y-axis direction and a second support beam 152b extending along the X-axis direction. The first support beam 152a and the second support beam 152b intersect at a predetermined position. In this way, the support beams 152 according to this embodiment are configured in a lattice shape.

Further, the first support beam 152a of this embodiment has a rail 155 provided on the upper surface. When carrying the catalyst pack 151 into the reactor 50, the wheels 171 (see FIG. 10) of the truck 170 engage with the rail 155. Furthermore, a first seal metal fitting 160 is provided on the upper surface of the first support beam 152a. The first seal hardware 160 is provided so as to protrude from the upper surface of the first support beam 152a. The first seal hardware 160 is a long member extending along the Y-axis direction. The upper surface of the first seal hardware 160 is flat. By pressing the packing 57 attached to the lower surface of the catalyst pack 151 onto the upper surface of the first seal metal fitting 160, the gap in the X-axis direction of the catalyst pack 151 is sealed.

Furthermore, as shown in FIGS. 8 and 9, a second sealing hardware (first sealing member) 161 is provided on the upper surface of the second support beam 152b of this embodiment. The second seal hardware 161 is provided so as to protrude from the upper surface of the second support beam 152b. The second seal hardware 161 is a long member extending along the X-axis direction. The upper surface of the second seal hardware 161 is flat. By pressing the packing 57 attached to the lower surface of the catalyst pack 151 against the upper surface of the second seal metal fitting 161, the gap in the X-axis direction of the catalyst pack 151 is sealed.
The second seal hardware 161 has cutouts 161a formed at the upper end at both ends in the X-axis direction. As shown in FIG. 10, this is formed so that the wheels 171 of the trolley 170 used when carrying in the catalyst pack 151 and the second seal hardware 161 do not interfere with each other.

If the notch 161a remains exposed, there is a possibility that the combustion gas will take a short pass through the notch 161a. Therefore, as shown in FIGS. 8 to 10, when installing the catalyst pack 151, the notch 161a is covered from above with a closing plate (second sealing member) 180. The notch 161a can be said to be a gap formed between the second seal hardware 161 and the second support beam 152b (more specifically, the rail 155 of the second support beam 152b), so the closing plate 180 It can be said that the gap formed between the hardware 161 and the second support beam 152b is sealed.

Further, the first support beam 152a may be used as a rail. In this case, the wheels 171 of the truck 170 engage with the inner end of the first support beam 152a in the X-axis direction. Further, at both ends in the X-axis direction of the second support beam 152b corresponding to the first sealing member, a notch is formed at the upper end so as not to interfere with the wheels 171 of the truck 170. In addition, since there is a possibility that combustion gas may make a short pass through the notch, a closing plate (second sealing member) corresponding to closing plate 180 may be used to close the notch in the second support beam 152b (first sealing member). cover from above. As a result, the rail 155 and the first seal hardware 160 can be omitted, so that the work time and number of parts involved in installation can be reduced.

This embodiment also provides the same effects as the first embodiment.

Note that the present disclosure is not limited to the above-described embodiments, and can be modified as appropriate without departing from the gist thereof.

For example, fuels used in boilers include solid fuels such as coal, biomass fuel, petroleum coke (PC), and petroleum residue, petroleum products such as heavy oil, light oil, and heavy oil, and liquids such as factory waste liquid. Fuel can be used. Gaseous fuels such as natural gas, various petroleum gases, and by-product gases generated in steel manufacturing processes can also be used.
Furthermore, it can also be applied to a mixed combustion boiler that uses a combination of these various fuels.

Further, the gas to be subjected to the denitration treatment is not limited to exhaust gas discharged from a boiler, but can also be applied to gas discharged from a gas turbine, an engine, a combustion furnace, an incinerator, and various reactors.

The denitrification device, the boiler, and the method for manufacturing the denitration device described in the embodiments described above can be understood, for example, as follows.
The denitrification device according to one aspect of the present disclosure extends in a predetermined direction (Y-axis direction) and is arranged at predetermined intervals in a cross direction (X-axis direction) that is a direction intersecting the predetermined direction (Y-axis direction). is placed on the plurality of support beams (52) such that the plurality of support beams (52) arranged in , a denitration catalyst (51) that denitrates the gas passing therethrough, and a denitration catalyst (51) extending in the intersecting direction (X-axis direction), and a denitration catalyst (51) and the denitration catalyst (51) in the predetermined direction (Y-axis direction) ) and a first sealing member (53) that seals a gap formed between the first sealing member (53) and a member adjacent to the support beam ( a second seal member (54) for sealing a gap formed between the lower surface and the denitrification catalyst (52); A packing (57) is attached to be sandwiched between the upper surface of the support beam (52).

In the above configuration, the packing sandwiched between the lower surface of the denitrification catalyst and the upper surface of the support beam is attached to the end of the lower surface of the denitrification catalyst in the cross direction. As a result, a gap (hereinafter referred to as a "crosswise gap") is formed between the denitration catalyst and a member adjacent to the denitration catalyst in the crosswise direction (hereinafter referred to as a "crosswise adjacent member"). ) are sealed by packing and support beams. Further, the above configuration includes a first seal member. As a result, a gap (hereinafter referred to as a "gap in a predetermined direction") formed between the denitrification catalyst and an adjacent member of the member adjacent to the denitrification catalyst in a predetermined direction (hereinafter referred to as "adjacent member in a predetermined direction") ) is sealed by the first sealing member. In this way, gaps in the cross direction and gaps in a predetermined direction can be sealed, reducing the amount of combustion gas flowing downstream of the denitrification catalyst without passing through the inside of the denitrification catalyst (so-called short-pass combustion gas). can do.
Further, the above configuration includes a second seal member. Thereby, the gap formed between the end portion of the first seal member in the cross direction and the support beam can also be sealed by the second seal member. Therefore, it is possible to further reduce the combustion gas passing through a short path.
Note that the adjacent members in the cross direction and the predetermined direction may be the denitration catalysts arranged adjacently, for example, when a plurality of denitration catalysts are arranged side by side in the cross direction and the predetermined direction. Further, the adjacent members in the cross direction and the predetermined direction may be, for example, a casing that forms the outer shell of the denitrification device when the denitrification catalyst is disposed at the end in the cross direction or the predetermined direction.
Further, in the above configuration, the packing is attached to the denitrification catalyst. Thereby, the denitrification catalyst can be transported with the packing attached to the denitrification catalyst. Therefore, for example, if a packing is attached to the denitrification catalyst at a factory and the denitrification catalyst is transported to the site (the place where the denitration catalyst is installed) with the packing attached, the process of attaching the packing to the denitration catalyst on site can be omitted. be able to. Therefore, the number of on-site assembly steps can be reduced, and the on-site construction process can be shortened. Furthermore, since the packing can be installed at a factory with better facilities and equipment than at the site, it is possible to suppress variations in quality and improve reliability.
Further, in the above configuration, the packing is attached to the lower surface of the denitrification catalyst, and is sandwiched between the lower surface of the denitrification catalyst and the upper surface of the support beam. Thereby, the packing can be pressed by the weight of the denitrification catalyst. Therefore, the parts that press the packing can be omitted, and the number of parts can be reduced.

Further, in the denitrification device according to one aspect of the present disclosure, the first seal member (53) is attached to an end of the lower portion of the denitrification catalyst (51) in the predetermined direction (Y-axis direction).

In the above configuration, the first seal member is attached to the lower end of the denitrification catalyst in a predetermined direction. Thereby, the denitrification catalyst can be transported with the first seal member attached to the denitrification catalyst. Therefore, for example, if the first seal member is attached to the denitrification catalyst at the factory and the denitrification catalyst is transported to the site (the place where the denitrification catalyst is installed) with the first seal member attached, the first seal member is attached at the site. The step of attaching the denitration catalyst to the denitrification catalyst can be omitted. Therefore, the number of on-site assembly steps can be reduced, and the on-site construction process can be shortened. Furthermore, since the first seal member can be installed at a factory with better facilities and equipment than at the site, variations in quality can be suppressed and reliability can be improved.

Further, in the denitrification device according to one aspect of the present disclosure, the first seal member (53) is in surface contact with a lower end portion of an end face of the denitrification catalyst (51) on one side in the predetermined direction (Y-axis direction). a plate-shaped first plate part (53a) fixed together with the plate-shaped second plate bent from the lower end of the first plate part (53a) and extending toward the one side in the predetermined direction (Y-axis direction). (53b).

In the above configuration, the first sealing member includes the first plate portion and the second plate portion bent and extending from the end of the first plate portion. That is, the first seal member has a substantially L-shaped cross section when cut along a plane perpendicular to the cross direction. Thereby, adjacent members in a predetermined direction can be placed on the upper surface of the second plate part. Therefore, since the gap in the predetermined direction also has a substantially L-shaped cross section when cut along a plane perpendicular to the intersecting direction, it becomes more difficult for combustion gas to pass through. Therefore, the sealing performance of the gap in the predetermined direction can be further improved.
Further, in the above configuration, the first plate portion is in surface contact with the end surface of the denitrification catalyst and is fixed. The sealing performance of the gap formed between the first plate portion and the denitrification catalyst can be improved, and the first seal member can be firmly fixed to the denitrification catalyst.

Further, a boiler according to one aspect of the present disclosure includes any one of the denitrification devices described above.

Further, a method for installing a denitrification device according to an aspect of the present disclosure is a method for installing a denitrification device (43) that denitrates gas, wherein the denitrification device (43) extends in a predetermined direction (Y-axis direction). and a plurality of support beams (52) arranged at predetermined intervals in a cross direction (X-axis direction) that is a direction that intersects the predetermined direction (Y-axis direction); A denitrification catalyst (51) is placed on the plurality of support beams (52) to denitrify the gas passing therethrough so as to construct the support beams (52) lined up in the cross direction (X a first sealing member (axial direction) that seals a gap formed between the denitrification catalyst (51) and a member adjacent to the denitrification catalyst (51) in the predetermined direction (Y-axis direction); 53), and a second seal member (54) that seals a gap formed between the end of the first seal member (53) in the cross direction (X-axis direction) and the support beam (52). A packing (57) sandwiched between the lower surface and the upper surface of the support beam (52) is attached to the end of the lower surface of the denitrification catalyst (51) in the cross direction (X-axis direction). , the second seal member (54) covers the gap formed between the end of the first seal member (53) in the cross direction (X-axis direction) and the support beam (52). A step of placing a denitrification catalyst (51) on the support beam (52) is provided.

10: Boiler 11: Furnace 12: Combustion gas passage 13: Flue 13a: Vertical section 20: Combustion device 21: Burner 23: Wind box 24: Air passage 32: Forced draft fan 41: Gas duct 42: Air preheater 43: Denitration Device 44: Dust collector 46: Desulfurization device 47: Chimney 50: Reactor 51: Catalyst pack 52: Support beam 52a: Positioning hardware 53: First seal member 53a: First plate portion 53b: Second plate portion 54: First 2 seal member 54a : Notch 54b : Closing part 54c : Overlapping part 55 : Rail 56 : Reinforcement member 57 : Packing 101 : Furnace wall 102 : Superheater 103 : Reheater 104 : Economizer 151 : Catalyst pack 152 : Support Beam 152a: First support beam 152b: Second support beam 155: Rail 160: First seal hardware 161: Second seal hardware (first seal member)
161a: Notch 170: Cart 171: Wheel 180: Closing plate (second seal member)

Claims (5)

a plurality of support beams extending in a predetermined direction and arranged in a line at predetermined intervals in a cross direction that is a direction intersecting the predetermined direction;
a denitrification catalyst that is placed on the plurality of support beams so as to construct the support beams arranged in the cross direction, and denitrates gas passing therethrough;
a first sealing member extending in the cross direction and sealing a gap formed between the denitration catalyst and a member adjacent to the denitration catalyst in the predetermined direction;
a second seal member that seals a gap formed between the end of the first seal member in the cross direction and the support beam;
A denitrification device, wherein a packing sandwiched between the lower surface and the upper surface of the support beam is attached to an end of the lower surface of the denitrification catalyst in the cross direction. The denitrification device according to claim 1, wherein the first seal member is attached to an end portion of the lower portion of the denitrification catalyst in the predetermined direction. The first sealing member includes a plate-shaped first plate portion that is in surface contact with and fixed to the lower end of the end face of the denitrification catalyst on one side in the predetermined direction, and a plate-shaped first plate portion that is bent from the lower end of the first plate portion. The denitrification device according to claim 2, further comprising a second plate portion extending toward the one side in the predetermined direction. A boiler equipped with the denitrification device according to any one of claims 1 to 3. A method for installing a denitrification device for denitrifying gas, the method comprising:
The denitrification device is
a plurality of support beams extending in a predetermined direction and arranged in a line at predetermined intervals in a cross direction that is a direction intersecting the predetermined direction;
a denitrification catalyst that is placed on the plurality of support beams so as to construct the support beams arranged in the cross direction, and denitrates gas passing therethrough;
a first sealing member extending in the cross direction and sealing a gap formed between the denitration catalyst and a member adjacent to the denitration catalyst in the predetermined direction;
a second seal member that seals a gap formed between the end of the first seal member in the cross direction and the support beam;
A packing sandwiched between the lower surface and the upper surface of the support beam is attached to the end of the lower surface of the denitrification catalyst in the cross direction,
the step of placing the denitrification catalyst on the support beam so that the second seal member covers a gap formed between the end of the first seal member in the cross direction and the support beam; How to install a denitrification device.