TWI840050B - Denitrification device and boiler, and installation method of denitrification device - Google Patents

Abstract

The purpose is to reduce the gas that flows to the downstream side of the denitrification catalyst without passing through the interior of the denitrification catalyst (so-called short-circuit gas).

The denitrification device comprises: a plurality of support beams (52), a catalyst bag (51), a first sealing member (53) and a second sealing member (54), wherein the plurality of support beams (52) extend in the Y-axis direction and are arranged in parallel at predetermined intervals along the X-axis direction; the catalyst bag (51) is mounted on the plurality of support beams (52) in a manner of being erected between the support beams (52) arranged in parallel along the X-axis direction. 52), and is used to denitrify the gas passing through the interior; the first sealing member (53) extends in the X-axis direction, and is used to seal the gap formed between the catalyst package (51) and the member adjacent to the catalyst package (51) in the Y-axis direction; the second sealing member (54) is used to seal the gap formed between the end of the first sealing member (53) in the X-axis direction and the support beam (52). A clamp (57) is installed at the end of the lower surface of the catalyst package (51) in the X-axis direction, which is clamped by the lower surface and the upper surface of the support beam (52).

Description

Denitrification device and boiler, and installation method of denitrification device

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

Large boilers such as power generation boilers have a hollow furnace that is arranged in the vertical direction, and a plurality of burners are arranged on the furnace wall along the circumferential direction of the furnace. Large boilers are connected to a flue above the vertical direction of the furnace, and a heat exchanger for generating steam is arranged in the flue. The burner forms a flame by spraying a mixture of fuel and air (oxidizing gas) into the furnace, and the combustion gas is generated and flows through the flue. The heat exchanger is set in the area where the combustion gas flows, and the water and steam flowing in the heat transfer tubes constituting the heat exchanger are heated to generate superheated steam. A denitrification device equipped with a denitrification catalyst is installed downstream of the heat exchanger in the flue to remove nitrogen oxides (NOx) from the combustion gas.

The catalyst packs provided in the catalyst layer in the denitrification reactor constituting 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. There is a possibility that the combustion gas short-passes through the gaps (the combustion gas flows to the downstream side of the denitrification device without passing through the catalyst packs, short pass). In order to suppress the short-passing of the combustion gas, a structure of providing a sealing plate for sealing the gaps formed between the catalyst packs is known (for example, Patent Document 1).

Patent document 1 describes a catalyst reactor having a reactor duct, a beam, a catalyst block, and the like. The catalyst reactor has a beam horizontally arranged in the reactor duct, and the catalyst block is mounted between two beams and supported by the two beams. The catalyst block is formed by installing at least one catalyst unit in a frame-like shell. In the reactor duct, a plurality of catalyst blocks are arranged in the reactor duct in such a manner that the front surface and the rear surface of the frame-like shell face each other and are adjacent to each other, and the right side and the left side of the frame-like shell face each other and are adjacent to each other. The catalyst unit contained in the catalyst block is formed by, for example, accommodating the catalyst in a frame. The catalyst contains a component that activates the denitration reaction and is formed into a grid, honeycomb, corrugated board, plate, or other shapes. The catalyst block is installed in a manner that the front surface or the rear surface is parallel to the beam, and a sealing member is installed at the lower part (preferably the lower end) of the right side of the frame-shaped shell. When the catalyst blocks are arranged in the reactor duct, the sealing member seals the lower part of the gap between the right side and the left side. By providing the sealing member, the amount of combustion exhaust gas that passes through the gap between the catalyst blocks without passing through the catalyst layer can be reduced. [Prior technical literature] [Patent literature]

[Patent Document 1] Japanese Patent Application Publication No. 2021-122800

[The problem the invention is trying to solve]

In recent years, from the perspective of reducing greenhouse gas emissions, boilers using hydrogen and ammonia as fuel have attracted attention. However, when using hydrogen and ammonia as fuel, it is expected that the amount of NOx (nitrogen oxides) produced will increase significantly compared to the use of traditional fuels such as coal. Therefore, in boilers using hydrogen and ammonia as fuel, in order to reduce NOx emissions, short-circuiting of the combustion gas must be more strictly controlled. Based on this viewpoint, it is expected to provide a technology that more effectively suppresses short-circuiting of the combustion gas. In the boiler described in Patent Document 1, although a sealing member is provided, a gap is formed between the end of the sealing member in the longitudinal direction and the beam. It is possible that the combustion gas short-circuit from the gap, and short-circuiting may not be fully suppressed.

This disclosure was developed in view of such a situation, and its purpose is to provide a denitrification device and a boiler and a method for installing a denitrification device that can reduce the combustion gas that flows to the downstream side of the denitrification catalyst without passing through the interior of the catalyst bag (denitrification catalyst) (so-called short-circuit combustion gas). [Technical means for solving the problem]

In order to solve the above problems, the denitrification device and boiler disclosed herein and the method for installing the denitrification device adopt the following means. A denitrification device disclosed herein comprises: a plurality of support beams, a denitrification catalyst, a first sealing member and a second sealing member, wherein the plurality of the support beams extend in a predetermined direction and are arranged side by side at predetermined intervals along a direction intersecting the predetermined direction, i.e., the cross direction; the denitrification catalyst is mounted on the plurality of the support beams in a manner of being mounted between the support beams arranged side by side along the cross direction, and is used to denitrify the gas passing through the interior; the first sealing member The sealing member extends in the aforementioned cross direction and is used to seal the gap formed between the aforementioned denitrification catalyst and the member adjacent to the denitrification catalyst in the aforementioned predetermined direction; the aforementioned second sealing member is used to seal the gap formed between the aforementioned end of the first sealing member in the aforementioned cross direction and the aforementioned support beam; a packing is installed at the aforementioned end of the lower surface of the denitrification catalyst in the aforementioned cross direction and is clamped by the aforementioned lower surface and the upper surface of the aforementioned support beam.

The present invention discloses a method for installing a denitrification device in a certain aspect, which is a method for installing a denitrification device for denitrifying gas. The denitrification device comprises: a plurality of support beams, a denitrification catalyst, a first sealing member and a second sealing member. The plurality of support beams extend in a predetermined direction and are arranged side by side at predetermined intervals along a direction intersecting the predetermined direction, i.e., the cross direction. The denitrification catalyst is mounted on the plurality of support beams in a manner of being mounted between the support beams arranged side by side along the cross direction, and is used to denitrify the gas passing through the interior. The first sealing member extends in the cross direction, and is used to form a seal formed in the denitrification device. The gap between the aforementioned denitrification catalyst and the member adjacent to the denitrification catalyst in the aforementioned predetermined direction is sealed; the aforementioned second sealing member is used to seal the gap formed between the end of the aforementioned first sealing member in the aforementioned cross direction and the aforementioned support beam; a clamping member clamped by the aforementioned lower surface and the upper surface of the aforementioned support beam is installed at the end of the aforementioned cross direction of the lower surface of the aforementioned denitrification catalyst, and the installation method of the denitrification device has the following steps: the aforementioned denitrification catalyst is placed on the aforementioned support beam in such a way that the aforementioned second sealing member covers the gap formed between the end of the aforementioned first sealing member in the aforementioned cross direction and the aforementioned support beam. [Effect of the invention]

According to the present disclosure, the gas that flows toward the downstream side of the denitrification catalyst without passing through the interior of the denitrification catalyst can be reduced.

Hereinafter, an embodiment of the denitrification device, the boiler, and the installation method of the denitrification device disclosed in the present invention will be described with reference to the drawings. Hereinafter, the up-down direction is referred to as the Z-axis direction. The direction in which the support beam extends in the horizontal direction is referred to as the Y-axis direction. The direction orthogonal to the Z-axis direction and the Y-axis direction is referred to as the X-axis direction.

[First Implementation Form] Below, the first implementation form of the present disclosure is described with reference to the drawings. The present invention is not limited by this implementation form, and when there are multiple implementation forms, it also includes a combination of various implementation forms. In the following description, top and upper side refer to the upper side in the lead vertical direction, and bottom and lower side refer to the lower side in the lead vertical direction. The lead vertical direction is not so strict and includes errors.

FIG. 1 is a diagram schematically showing the structure of a boiler according to the present embodiment.

The boiler 10 of this embodiment burns fuel using a burner 21, and the heat generated by the combustion is exchanged with water supply and steam to generate superheated steam.

The boiler 10 has a furnace 11, a combustion device 20 and a combustion gas passage 12. The furnace 11 is formed into a hollow square tube shape and is arranged along the lead vertical direction. The furnace wall 101 constituting the inner wall surface of the furnace 11 is composed of a plurality of heat transfer tubes and fins for connecting the heat transfer tubes to each other. The heat generated by the combustion of the powdered fuel is recovered by heat exchange with water and steam flowing inside the heat transfer tubes, and the temperature rise of the furnace wall 101 is suppressed.

The combustion device 20 is installed in the lower area of the furnace 11. In the present embodiment, the combustion device 20 has: a plurality of burners 21A, 21B, 21C, 21D, 21E, 21F (hereinafter collectively referred to as "burners 21") installed on the furnace wall 101. The burners 21 are arranged in a set at equal intervals along the circumferential direction of the furnace 11 (for example, 4 burners are arranged at each corner of the quadrilateral furnace 11), and a plurality of sections are arranged along the vertical direction. In FIG. 1, for the convenience of illustration, only two burners in a set are recorded, and each set is given a symbol 21A, 21B, 21C, 21D, 21E, 21F. The shape of the furnace, the number of burner stages, the number of burners in one stage, the arrangement of the burners, etc. are not limited to the present embodiment.

An air box (air resistor) 23 is provided on the outside of the furnace 11 at the installation position of the burner 21, and the air box 23 is connected to one end of an air duct (air pipe) 24. The other end of the air duct 24 is connected to a forced draft fan (FDF: Forced Draft Fan) 32. The air supplied from the forced draft fan 32 is heated by an air preheater 42 (described later) provided in the air duct 24, and is supplied to the burner 21 as combustion air (oxidizing gas) through the air box 23, and then is injected into the interior of the furnace 11.

The combustion gas passage 12 is connected to the upper part of the furnace 11 in the vertical direction. In the combustion gas passage 12, as heat exchangers for recovering the heat of the combustion gas, superheaters 102A, 102B, 102C (hereinafter, collectively referred to as "superheaters 102"), reheaters 103A, 103B (hereinafter, collectively referred to as "reheaters 103"), and economizers 104 are provided, so that heat is exchanged between the combustion gas generated in the furnace 11 and the feed water and steam flowing inside each heat exchanger. The arrangement and shape of each heat exchanger are not limited to the shape described in FIG. 1.

A flue 13 is connected to the downstream side of the combustion gas passage 12 for discharging the combustion gas after heat recovery by the heat exchanger. An air preheater 42 is provided between the flue 13 and the air duct 24 to heat the combustion air supplied to the burner 21 by exchanging heat between the air flowing in the air duct 24 and the combustion gas flowing in the flue 13, thereby further recovering heat from the combustion gas after heat exchange with water and steam.

A denitrification device 43 may be provided at a position upstream of the flue 13 from the air preheater 42. The denitrification device 43 supplies a reducing agent having the function of reducing nitrogen oxides such as ammonia and urea water to the combustion gas flowing in the flue 13, and utilizes the catalytic action of the denitrification catalyst provided in the denitrification device 43 to promote the reaction between nitrogen oxides (NOx) in the combustion gas supplied with the reducing agent and the reducing agent, thereby removing or reducing nitrogen oxides in the combustion gas. A gas duct 41 is connected to a position downstream of the flue 13 from the air preheater 42. The gas duct 41 is provided with: a dust collecting device 44 such as an electrostatic dust collector for removing ash and the like from the combustion gas, an environmental device such as a desulfurization device 46 for removing sulfur oxides, and a forced draft fan (IDF: Induced Draft Fan) 45 for guiding the exhaust gas to the environmental devices. The downstream end of the gas duct 41 is connected to a chimney 47, and the combustion gas treated by the environmental device becomes exhaust gas and is discharged outside the system.

The fuel is supplied to the burner 21 through a fuel supply pipe (not shown), and the combustion air heated by the air preheater 42 is supplied to the burner 21 from the air duct 24 through the wind box 23. The burner 21 sprays the fuel and the combustion air into the furnace 11. The fuel sprayed into the furnace 11 is ignited to form a flame. The flame is formed in the lower area of the furnace 11, and the high-temperature combustion gas rises in the furnace 11 and flows into the combustion gas passage 12. In the present embodiment, although air is used as the combustion air (oxidizing gas), a gas having a higher or lower oxygen ratio than air may be used. By adjusting the ratio of the amount of oxygen to the amount of fuel supplied to an appropriate range, stable combustion can be achieved in the furnace 11.

The combustion gas flowing into the combustion gas passage 12 exchanges heat with water and steam through the superheater 102, reheater 103, and economizer 104 disposed inside the combustion gas passage 12, and then is discharged to the flue 13. Nitrogen oxides are removed through the denitration device 43, and then the combustion gas exchanges heat with primary air and secondary air through the air preheater 42, and then is discharged to the gas duct 41. Ashes and the like are removed through the dust collector 44, and sulfur oxides are removed through the desulfurization device 46, and then the combustion gas is discharged to the outside of the system from the chimney 47. The arrangement of the heat exchangers on the combustion gas passage 12 and the devices from the flue 13 to the gas duct 41 does not necessarily have to be arranged in the order described above for the combustion gas flow.

Next, the details of the denitrification device 43 of this embodiment will be described using Figures 1 to 6.

As shown in FIG1 , a denitrification device 43 is provided at a midway position of a portion of the flue 13 extending in the Z-axis direction (hereinafter referred to as a "straight portion 13a"). That is, in the denitrification device 43, the combustion gas is allowed to flow in the Z-axis direction. More specifically, the combustion gas is allowed to flow from the top to the bottom.

As shown in FIG. 2 , the denitrification device 43 includes: a reactor 50 constituting an outer shell, a plurality of catalyst packages (denitrification catalysts) 51 disposed inside the reactor 50, and a plurality of support beams 52 extending in the Y-axis direction inside the reactor 50. The denitrification device 43 also includes: a first sealing member 53 fixed to the lower end of the end surface of the catalyst package 51 in the Y-axis direction (predetermined direction), and a second sealing member 54 for sealing the gap formed between the end of the first sealing member 53 in the X-axis direction and the support beam 52. The denitrification device 43 also includes: a pair of rails 55 extending in the Y-axis direction. The rails 55 are used when the catalyst package 51 is moved into the reactor 50. The denitrification device 43 is also equipped with a reinforcing member 56 fixed along the inner peripheral surface of the reactor 50.

As shown in FIG2 , the reactor 50 is a rectangular cylindrical member with openings at the upper and lower ends. The upper opening of the reactor 50 is connected to the flue 13 on the upstream side, and the lower opening is connected to the flue 13 on the downstream side. The combustion gas flowing into the reactor 50 from the upper opening flows downward in the reactor 50 and flows out from the lower opening.

A plurality of catalyst bags 51 are housed inside the reactor 50. The catalyst bags 51 allow the combustion gas flowing in the reactor 50 to pass through. The catalyst bags 51 reduce and remove (denitrify) at least a portion of the nitrogen oxides in the combustion gas passing through. Details of the catalyst bags 51 will be described later.

The support beam 52 extends in the Y-axis direction, and both ends of the support beam 52 in the Y-axis direction are fixed to the inner peripheral surface of the reactor 50. The support beam 52 is a long strip-shaped member, and the cross-section when cut from a plane perpendicular to the Y-axis direction is approximately H-shaped or approximately C-shaped. A plurality of support beams 52 are arranged side by side at predetermined intervals along the X-axis direction. A plurality of support beams 52 are arranged side by side at predetermined intervals along the Z-axis direction in a manner of forming a plurality of sections. The support beam 52 arranged in the lowest section is arranged at the lower end of the reactor 50.

The upper surface of the support beam 52 is a flat surface. The catalyst pack 51 is placed on the upper surface of the support beam 52. A positioning metal part 52a protruding upward is fixed to the upper surface of the support beam 52 by, for example, welding. The positioning metal part 52a is fixed to the approximate center of the upper surface of the support beam 52 in the X-axis direction and is used to position the catalyst pack 51.

As shown in FIG. 2 , a plurality of catalyst packs 51 are arranged side by side to cover substantially the entire area of the flow path section (a section formed by the X-axis direction and the Y-axis direction) of the reactor 50. In the present embodiment, a plurality of catalyst packs 51 are arranged along the Y-axis direction and a plurality of catalyst packs 51 are arranged along the X-axis direction. A plurality of catalyst packs 51 are also arranged side by side at predetermined intervals along the Z-axis direction to form a plurality of catalyst layers. FIG. 2 only illustrates a portion of one layer of the plurality of catalyst packs 51. Because the structure of each catalyst pack 51 is the same, the structure of one catalyst pack 51 is representatively described below.

The catalyst pack 51 is mounted on the upper surface of the support beam 52 in a manner of being mounted between the adjacent support beams 52 in the X-axis direction. That is, the catalyst pack 51 is mounted on the upper surface of the support beam 52 in a manner of spanning between two support beams 52. In detail, the catalyst pack 51 is mounted on the upper surface of the support beam 52 by the clamp 57 described later.

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

As shown in FIG3 , a clamp 57 is installed on the lower surface of the catalyst package 51. The clamp 57 is installed on the outer periphery of the lower surface of the catalyst package 51. Specifically, the clamp 57 is installed along three sides of the outer periphery of the lower surface of the catalyst package 51, and the clamp 57 is not installed on one side of the end portion arranged in the Y-axis direction. The clamp 57 is clamped by the lower surface of the catalyst package 51 and the upper surface of the support beam 52. The clamp 57 is formed of a material that is deformed by the weight of the catalyst package 51 itself, and by placing the catalyst package 51 on the upper surface of the support beam 52, the clamp 57 is deformed in a manner that fills the gap between the lower surface of the rectangular frame of the catalyst package 51 and the upper surface of the support beam 52.

Furthermore, the first sealing member 53 is fixed to the catalyst pack 51 at the end in the Y-axis direction of the lower portion of the catalyst pack 51. Specifically, the first sealing member 53 is provided along the side of the outer peripheral portion of the lower surface of the catalyst pack 51 where the clamping member 57 is not attached.

The first sealing member 53 is formed of a metal material. The first sealing member 53 has: a first plate portion 53a formed as an integral plate and a second plate portion 53b. The first plate portion 53a is fixed to the lower end of the end surface of one side of the Y-axis direction of the catalyst package 51 in a surface contact manner; the second plate portion 53b is bent approximately vertically from the lower end of the first plate portion 53a and extends toward one side of the Y-axis direction (the hand side of the direction of carrying the catalyst package 51 into the reactor 50). The first sealing member 53 has a substantially L-shaped cross-section when cut from a plane orthogonal to the X-axis direction. The first plate portion 53a and the catalyst package 51 are fixed by, for example, bolts. The first sealing member 53 is provided in substantially the entire area of the catalyst package 51 in the X-axis direction. Specifically, the first sealing member 53 is provided at the catalyst pack 51 except for the two ends in the X-axis direction with a length equal to the interval between the two adjacent support beams 52 in the X-axis direction. A gap S2 is formed between the two ends in the X-axis direction of the first sealing member 53 and the support beam 52 (see FIG. 6 ).

The first sealing member 53 extends in the cross direction and is used to seal the gap formed between the members arranged adjacently in the Y-axis direction (hereinafter referred to as "adjacent members in the Y-axis direction"). As adjacent members in the Y-axis direction, for example, the catalyst pack 51 and the reactor 50 adjacent in the Y-axis direction can be cited. In this embodiment, the catalyst pack 51 adjacent in the Y-axis direction is described. The first sealing member 53 seals the gap S1 (see FIG. 5) formed between the catalyst packs 51. That is, the combustion gas flow that wants to pass through the gap S1 is blocked by the second plate portion 53b. In this way, the first sealing member 53 seals the gap S1. As shown in FIG5 , the adjacent catalyst pack 51 is placed on the upper surface of the second plate portion 53b.

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

The second sealing member 54 has a notch 54a formed at the end portion on the inner side 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 carrying direction). That is, the second sealing member 54 has a closed portion 54b and an overlapped portion 54c formed integrally, the closed portion 54b being provided on the outer side in the X-axis direction (outer side of the catalyst pack 51), and the overlapped portion 54c being provided on the inner side in the X-axis direction and having a length in the Y-axis direction shorter than that of the closed portion 54b.

The second sealing member 54 is provided at both ends in the X-axis direction on one side of the catalyst pack 51 in the Y-axis direction. As shown in FIG. 5 , the overlapping portion 54c is provided to overlap with the upper surface of the second plate portion 53b of the first sealing member 53. On the other hand, the closing portion 54b is provided on the outer side of the first sealing member 53 in the X-axis direction, thereby covering and closing the gap S2 from above, and the outer end of the closing portion 54b in the X-axis direction is placed on the upper surface of the support beam 52, and the catalyst pack 51 is placed on at least a portion of the upper surface of the closing portion 54b. That is, the outer end of the closing portion 54b is clamped by the support beam 52 and the catalyst pack 51 (in detail, the clamp 57).

Next, the installation method of the denitrification device 43 of this embodiment is explained. First, the catalyst pack 51 is manufactured in the factory. Then, the tightening member 57 and the first sealing member 53 are installed on the catalyst pack 51 in the factory. The first sealing member 53 does not need to be installed in the factory, but can be installed on site (the installation site of the denitrification device 43 in a power plant, etc.). Next, the catalyst pack 51 with the tightening member 57 and the first sealing member 53 installed is transported to the site.

Next, the catalyst pack 51 is moved into the reactor 50. At this time, the support beam 52 has been fixed in the reactor 50. The catalyst pack 51 is placed on a trolley with wheels that engage with the rail 55 and moved in. When the catalyst pack 51 is moved in, as shown in Figures 3 and 4, the side provided with the first sealing member 53 is moved in as the hand side. When the catalyst pack 51 is moved into a predetermined position, the catalyst pack 51 is removed from the trolley and placed on the upper surface of the support beam 52. At this time, the catalyst pack 51 is placed while the second sealing member 54 is arranged at a predetermined position. Specifically, the second sealing member 54 is configured such that the overlapping portion 54c of the second sealing member 54 is placed on the upper surface of the second plate portion 53b of the first sealing member 53 and the closing portion 54b is located below the clamping portion 57 installed on the lower surface of the catalyst pack 51. In this state, the catalyst pack 51 is placed on the upper surface of the support beam 52 (see FIG. 6).

If the first catalyst pack 51 is moved in, the second catalyst pack 51 (the catalyst pack 51 adjacent to the first catalyst pack 51 in the Y-axis direction) is then moved in. When the second catalyst pack 51 is to be set at a predetermined position, as shown in FIG. 4 and FIG. 5 , the second catalyst pack 51 is set in a manner such that it is placed on the upper surface of the first sealing member 53 of the first catalyst pack 51 (refer to FIG. 5 (a), (b)). The denitrification device 43 is set in this manner.

According to this embodiment, the following effects can be achieved. In this embodiment, a clamp 57 is installed at the end of the lower surface of the catalyst package 51 in the X-axis direction, which is clamped by the lower surface of the catalyst package 51 and the upper surface of the support beam 52. Thereby, the gap (hereinafter referred to as the "gap in the X-axis direction") formed between the catalyst package 51 and the component adjacent to the catalyst package 51 in the X-axis direction (hereinafter referred to as the "adjacent component in the X-axis direction") is sealed by the clamp 57 and the support beam 52. In addition, the first sealing component 53 is provided in this embodiment. Thus, the gap S1 (hereinafter referred to as "the gap in the Y-axis direction") formed between the catalyst pack 51 and the member adjacent to the catalyst pack 51 in the Y-axis direction (hereinafter referred to as "the member adjacent to the Y-axis direction") is sealed by the first sealing 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 to the downstream side of the catalyst pack 51 without passing through the inside of the catalyst pack 51 (so-called short-circuited combustion gas) can be reduced.

The present embodiment further includes a second sealing member 54. Thus, the gap S2 formed between the end of the first sealing member 53 in the X-axis direction and the support beam 52 can also be sealed by the second sealing member 54. Therefore, short-circuiting of the combustion gas can be further reduced.

In the present embodiment, the clamp 57 is mounted on the catalyst pack 51. Thus, the catalyst pack 51 can be transported with the clamp 57 mounted on it. Therefore, for example, when the clamp 57 is mounted on the catalyst pack 51 in the factory and the catalyst pack 51 is transported to the site with the clamp 57 mounted on it, the process of mounting the clamp 57 on the catalyst pack 51 on the site can be omitted. Therefore, the assembly time on the site can be reduced, and the construction process on the site can be shortened. Moreover, the clamp 57 can be mounted in the factory with complete equipment and devices compared to the site, so the quality deviation can be suppressed and the reliability can be improved.

In this embodiment, the clamp 57 is mounted on the lower surface of the catalyst pack 51 and is held by the lower surface of the catalyst pack 51 and the upper surface of the support beam 52. Thus, the clamp 57 can be pressed by the weight of the catalyst pack 51. Therefore, the number of parts can be reduced because the parts for pressing the clamp 57 can be omitted.

In the present embodiment, the first sealing member 53 is mounted on the end of one side of the Y-axis direction of the lower part of the catalyst pack 51 (the hand side in the direction of carrying the catalyst pack 51 into the reactor 50). In this way, the catalyst pack 51 can be transported with the first sealing member 53 mounted on it. Therefore, for example, when the first sealing member 53 is mounted on the catalyst pack 51 in the factory and the catalyst pack 51 is transported to the site with the first sealing member 53 mounted, the process of mounting the first sealing member 53 on the catalyst pack 51 on site can be omitted. Therefore, the assembly time on site can be reduced and the construction process on site can be shortened. Furthermore, the first sealing member 53 can be installed in a factory equipped with facilities and devices as compared to on-site installation, thereby suppressing quality deviation and improving reliability.

In this embodiment, the first sealing member 53 has a first plate portion 53a and a second plate portion 53b bent and extended from the end of the first plate portion 53a. That is, the first sealing member 53 has a substantially L-shaped cross section when cut from a surface perpendicular to the X-axis direction. Thus, adjacent components in the Y-axis direction can be placed on the upper surface of the second plate portion 53b. Therefore, the gap in the Y-axis direction also has a substantially L-shaped cross section when cut from a surface perpendicular to the X-axis direction, making it more difficult for combustion gas to pass through. Therefore, the sealing performance of the gap in the Y-axis direction can be further improved.

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

[Second embodiment] Next, the second embodiment of the present disclosure will be described using Figures 7 to 10. The difference between this embodiment and the first embodiment is that the support beams are arranged in a grid shape. The sealing structure of the catalyst pack is different from that of the first embodiment. The same symbols are given to the same structures as the first embodiment, and their detailed descriptions are omitted.

The catalyst pack 151 of this embodiment is equipped with a clamp 57 on all four sides of the lower surface. The first sealing member 53 described in the first embodiment is not installed on the catalyst pack 151. The support beam 152 of this embodiment has: 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 cross at a predetermined position. In this way, the support beam 152 of this embodiment is configured in a lattice shape.

In addition, the first support beam 152a of the present embodiment has a track 155 disposed on the upper surface. When the catalyst package 151 is moved into the reactor 50, the track 155 engages with the wheel 171 of the trolley 170 (refer to Figure 10). In addition, a first sealing metal part 160 is disposed on the upper surface of the first support beam 152a. The first sealing metal part 160 is disposed to protrude from the upper surface of the first support beam 152a. The first sealing metal part 160 is a long strip-shaped component extending along the Y-axis direction. The upper surface of the first sealing metal part 160 is a plane. The clamp 57 mounted on the lower surface of the catalyst package 151 is pressed against the upper surface of the first sealing metal part 160, thereby sealing the gap of the catalyst package 151 in the X-axis direction.

As shown in Figures 8 and 9, a second sealing metal part (first sealing member) 161 is provided on the upper surface of the second support beam 152b of the present embodiment. The second sealing metal part 161 is provided to protrude from the upper surface of the second support beam 152b. The second sealing metal part 161 is a long strip-shaped member extending along the X-axis direction. The upper surface of the second sealing metal part 161 is a plane. The clamp 57 mounted on the lower surface of the catalyst package 151 is pressed against the upper surface of the second sealing metal part 161, thereby sealing the gap of the catalyst package 151 in the X-axis direction. The second sealing metal part 161 is formed with a notch 161a at the upper end at both ends in the X-axis direction. As shown in FIG. 10 , the notch 161a is to avoid interference between the wheel 171 of the trolley 170 used when the catalyst package 151 is moved in and the second sealing metal part 161 .

If the notch 161a is exposed as it is, there is a possibility that the combustion gas will be short-circuited through the notch 161a. Therefore, as shown in Figures 8 to 10, when the catalyst pack 151 is installed, the notch 161a is covered from above by a sealing plate (second sealing member) 180. The notch 161a can be said to be a gap formed between the second sealing metal part 161 and the second support beam 152b (more specifically, the track 155 of the second support beam 152b), and the sealing plate 180 can be said to seal the gap formed between the second sealing metal part 161 and the second support beam 152b.

The first support beam 152a can also be used as a track. In this case, the wheel 171 of the trolley 170 is engaged with the inner end of the first support beam 152a in the X-axis direction. Furthermore, 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 to avoid interference with the wheel 171 of the trolley 170. It is also possible that the combustion gas is short-circuited through the notch, so the notch of the second support beam 152b (first sealing member) is covered from above by a sealing plate (second sealing member) corresponding to the sealing plate 180. Thereby, the track 155 and the first sealing metal member 160 can be omitted, thereby reducing the operation time and the number of parts related to the installation.

This embodiment can also produce the same effect as the first embodiment described above.

The present disclosure is not limited to the above-mentioned embodiments and can be modified appropriately without departing from the gist of the present disclosure.

For example, the fuel used in the boiler may be solid fuels such as coal, biomass fuel, petroleum coke (PC: Petroleum Coke), petroleum residue, etc., petroleum such as heavy oil, light oil, heavy oil, etc., liquid fuels such as factory waste liquid, etc. It is also possible to use gas fuels such as natural gas, various petroleum gases, by-product gases generated in the steelmaking process, etc. Furthermore, it can also be used in a mixed-fired boiler that uses a combination of these fuels.

The gas that can be treated by denitrification is not limited to exhaust gas from boilers, but can also be applied to exhaust gas from gas turbines, engines, combustion furnaces, incinerators and various reaction furnaces.

The denitrification device and the boiler and the manufacturing method of the denitrification device described in the above-described embodiment can be understood as follows. A denitrification device disclosed in one aspect comprises: a plurality of support beams (52), a denitrification catalyst (51), a first sealing member (53) and a second sealing member (54), wherein the plurality of support beams (52) extend in a predetermined direction (Y-axis direction) and are arranged side by side at predetermined intervals along an X-axis direction intersecting the predetermined direction (Y-axis direction), i.e., a cross direction (X-axis direction); the denitrification catalyst (51) is mounted on the plurality of support beams (52) in a manner of being mounted between the support beams (52) arranged side by side along the cross direction (X-axis direction), and is used to denitrify the gas passing through the interior; the first sealing member (53) is provided to seal the denitrification catalyst (51) and seal the denitrification catalyst (51) in a manner of being mounted between the support beams (52) arranged side by side along the cross direction (X-axis direction), and is used to seal the gas passing through the interior; the first sealing member (54) is provided to seal the denitrification catalyst (51) and seal the denitrification catalyst (51) in a manner of being mounted between the support beams (52) arranged side by side along the cross direction (X-axis direction), and ... is used to seal the gas passing through the interior; the first sealing member (53) is provided to seal the denitrification catalyst (51) and seal the denitrification catalyst (51) in a manner of being mounted to seal the denitrification catalyst (51) and seal the denitrification catalyst (51) in a manner of being mounted to seal the denitrification catalyst (51) and seal the denitrification catalyst (51 The sealing member (53) extends in the aforementioned intersecting direction (X-axis direction) and is used to seal the gap formed between the aforementioned denitrification catalyst (51) and a member adjacent to the aforementioned denitrification catalyst (51) in the aforementioned predetermined direction (Y-axis direction); the second sealing member (54) is used to seal the gap formed between the end of the aforementioned first sealing member (53) in the aforementioned intersecting direction (X-axis direction) and the aforementioned support beam (52), and a clamping member (57) is installed at the end of the aforementioned intersecting direction (X-axis direction) of the lower surface of the aforementioned denitrification catalyst (51) to be clamped by the aforementioned lower surface and the upper surface of the aforementioned support beam (52).

In the above-mentioned structure, a clamping member clamped by the lower surface of the denitrification catalyst and the upper surface of the support beam is installed at the end of the cross direction of the lower surface of the denitrification catalyst. Thereby, the gap (hereinafter referred to as the "gap in the cross direction") formed between the denitrification catalyst and the member adjacent to the denitrification catalyst in the cross direction (hereinafter referred to as the "adjacent member in the cross direction") is sealed by the clamping member and the support beam. In the above-mentioned structure, a first sealing member is provided. Thereby, the gap (hereinafter referred to as the "gap in the predetermined direction") formed between the denitrification catalyst and the member adjacent to the denitrification catalyst in a predetermined direction (hereinafter referred to as the "adjacent member in the predetermined direction") is sealed by the first sealing member. In this way, the gap in the cross direction and the gap in the predetermined direction can be sealed, thereby reducing the combustion gas (so-called short-circuited combustion gas) that flows to the downstream side of the denitrification catalyst without passing through the interior of the denitrification catalyst. In the above-mentioned structure, a second sealing member is provided. Thereby, the gap formed between the end of the cross direction of the first sealing member and the support beam can also be sealed by the second sealing member. Therefore, the short-circuited combustion gas can be further reduced. Also, as an adjacent member in the cross direction and the predetermined direction, for example, when a plurality of denitrification catalysts are arranged side by side along the cross direction and the predetermined direction, the denitrification catalyst can be arranged adjacently. Also, as an adjacent component in the cross direction and the predetermined direction, for example, when the denitrification catalyst is arranged at the end of the cross direction or the predetermined direction, it can be a shell that constitutes the outer shell of the denitrification device. In the above-mentioned structure, it is tightly installed on the denitrification catalyst. Thereby, the denitrification catalyst can be transported in a state where the denitrification catalyst is tightly installed. Therefore, for example, when the denitrification catalyst is tightly installed in the factory and the denitrification catalyst is transported to the site (the place where the denitrification catalyst is to be installed) in a tightly installed state, the process of tightly installing the denitrification catalyst on the site can be omitted. Therefore, the assembly time on the site can be reduced and the construction process on the site can be shortened. Moreover, the clamping device can be installed in a factory equipped with equipment and devices compared to the on-site installation, so the quality deviation can be suppressed and the reliability can be improved. In the above-mentioned structure, the clamping device is installed on the lower surface of the denitrification catalyst, and is clamped by the lower surface of the denitrification catalyst and the upper surface of the support beam. In this way, the clamping device can be pressed by the weight of the denitrification catalyst itself. Therefore, since the parts used for pressing the clamping device can be omitted, the number of parts can be reduced.

In another aspect of the denitrification device disclosed herein, the first sealing member (53) is installed at the end of the lower portion of the denitrification catalyst (51) in the aforementioned predetermined direction (Y-axis direction).

In the above-mentioned structure, the first sealing member is installed at the end of the predetermined direction of the lower part of the denitrification catalyst. Thereby, the denitrification catalyst can be transported in a state where the first sealing member is installed on the denitrification catalyst. Therefore, for example, when the first sealing member is installed on the denitrification catalyst in the factory and the denitrification catalyst is transported to the site (the place where the denitrification catalyst is to be installed) in a state where the first sealing member is installed, the process of installing the first sealing member on the denitrification catalyst on the site can be omitted. Therefore, the assembly time on the site can be reduced and the construction process on the site can be shortened. In addition, compared with the site, the first sealing member can be installed in the factory with complete equipment and devices, so the quality deviation can be suppressed and the reliability can be improved.

In another aspect of the denitrification device disclosed herein, the aforementioned first sealing component (53) comprises: a first plate portion (53a) and a second plate portion (53b) formed as an integral body, wherein the first plate portion (53a) is fixed to the lower end portion of the end surface of the aforementioned denitrification catalyst (51) on one side of the aforementioned predetermined direction (Y-axis direction) in a surface contact manner; and the second plate portion (53b) is bent from the lower end of the aforementioned first plate portion (53a) and extends toward the aforementioned side of the aforementioned predetermined direction (Y-axis direction).

In the above-mentioned structure, the first sealing member has: a first plate portion, and a second plate portion bent and extended from the end of the first plate portion. That is, the first sealing member has a roughly L-shaped cross section when cut from a surface perpendicular to the intersection direction. Thereby, an adjacent member in a predetermined direction can be placed on the upper surface of the second plate portion. Therefore, the gap in a predetermined direction is also roughly L-shaped when cut from a surface perpendicular to the intersection direction, so it is more difficult for combustion gas to pass through. Therefore, the sealing of the gap in a predetermined direction can be further improved. In the above-mentioned structure, the first plate portion is fixed to the end face of the denitrification catalyst in a surface contact manner. The sealing of the gap formed between the first plate portion and the denitrification catalyst can be improved, and the first sealing member can be firmly fixed to the denitrification catalyst.

Another aspect of the present disclosure is a boiler equipped with any of the above-mentioned denitrification devices.

Another aspect of the present invention discloses a method for installing a denitrification device, which is a method for installing a denitrification device (43) for denitrifying gas. The denitrification device (43) The invention comprises: a plurality of support beams (52), a denitrification catalyst (51), a first sealing member (53) and a second sealing member (54), wherein the plurality of support beams (52) extend in a predetermined direction (Y-axis direction) and are arranged side by side at predetermined intervals along an X-axis direction intersecting the predetermined direction (Y-axis direction), i.e., an intersecting direction (X-axis direction); the denitrification catalyst (51) is mounted on the plurality of support beams (52) in a manner of being mounted between the support beams (52) arranged side by side along the intersecting direction (X-axis direction), and is used to denitrify the gas passing through the interior; the first sealing member (53) extends in the intersecting direction (X-axis direction), and is used to form a seal formed on the denitrification catalyst (51) and intersecting with the denitrification catalyst (51) in the predetermined direction. The denitrification device is provided with a second sealing member (54) for sealing a gap between adjacent members in the cross direction (in the Y-axis direction); the second sealing member (54) is used to seal a gap between the end of the first sealing member (53) in the cross direction (in the X-axis direction) and the support beam (52); a clamp (57) is installed at the end of the lower surface of the denitrification catalyst (51) in the cross direction (in the X-axis direction) and is clamped by the lower surface and the upper surface of the support beam (52). The installation method of the denitrification device includes the following steps: the denitrification catalyst (51) is placed on the support beam (52) in such a way that the second sealing member (54) covers the gap between the end of the first sealing member (53) in the cross direction (in the X-axis direction) and the support beam (52).

10: Boiler

11: Furnace

12: Combustion gas passage

13: Flue gas

13a: Lead straight part

20: Combustion device

21: Burner

23: Bellows

24: Air duct

32: Forced ventilation fan

41: Gas catheter

42: Air preheater

43: Denitrification device

44: Dust collection device

46: Desulfurization device

47:Chimney

50: Reactor

51: Catalyst package (denitrification catalyst)

52: Support beam

52a: Positioning metal parts

53: 1st sealing component

53a: Plate 1

53b: Plate 2

54: Second sealing member

54a: Gap

54b: Closed part

54c: Overlapping part

55:Track

56: Reinforcement components

57: Tight

101: Furnace wall

102:Superheater

103: Reheater

104: Economizer

151:Trigger Pack

152: Support beam

152a: 1st supporting beam

152b: Second supporting beam

155:Track

160: 1st sealing metal part

161: Second sealing metal part (first sealing component)

161a: Gap

170: Trolley

171:Wheels

180: Sealing plate (second sealing component)

[Figure 1] is a schematic diagram showing the structure of the boiler of the first embodiment of the present disclosure. [Figure 2] is a perspective view showing the main part of the denitrification device of the first embodiment of the present disclosure. [Figure 3] is a perspective view showing the catalyst pack of the first embodiment of the present disclosure. [Figure 4] is a schematic side view showing the manufacturing method of the denitrification device of the first embodiment of the present disclosure. [Figure 5 (a), (b)] are schematic side views showing the manufacturing method of the denitrification device of the first embodiment of the present disclosure. [Figure 6] is a schematic perspective view showing the manufacturing method of the denitrification device of the first embodiment of the present disclosure. [Figure 7] is a perspective view showing the main part of the denitrification device of the second embodiment of the present disclosure. [Figure 8] is an enlarged view of the main part (part XIII) of Figure 7. [Figure 9] is an enlarged view of the main part (part IX) of Figure 7. [Figure 10] is a cross-sectional view taken along the arrow X-X of Figure 9.

43: Denitrification device

50: Reactor

51: Catalyst package (denitrification catalyst)

52: Support beam

52a: Positioning metal parts

53: 1st sealing component

54: Second sealing member

55:Track

56: Reinforcement components

57: Tight

Claims (5)

A denitrification device comprises: a plurality of support beams, a denitrification catalyst, a first sealing member and a second sealing member, wherein the plurality of support beams extend in a predetermined direction and are arranged side by side at predetermined intervals along a direction intersecting the predetermined direction, i.e., a cross direction; the denitrification catalyst is mounted on the plurality of support beams in a manner of being mounted between the support beams arranged side by side along the cross direction and is used to denitrify gas passing through the interior; the first sealing member extends in the cross direction and is used to form a The gap between the aforementioned denitrification catalyst and the member adjacent to the aforementioned denitrification catalyst in the aforementioned predetermined direction is sealed; the aforementioned second sealing member is used to seal the gap formed between the aforementioned end of the first sealing member in the aforementioned cross direction and the aforementioned support beam; the aforementioned member adjacent to the aforementioned denitrification catalyst in the aforementioned predetermined direction is the aforementioned denitrification catalyst, or the shell constituting the outer shell of the aforementioned denitrification device, and a clamping member clamped by the aforementioned lower surface and the upper surface of the aforementioned support beam is installed at the aforementioned end of the lower surface of the aforementioned denitrification catalyst in the aforementioned cross direction. The denitrification device as described in claim 1, wherein the first sealing member is installed at the end of the predetermined direction below the denitrification catalyst. The denitrification device as described in claim 2, wherein the first sealing member comprises a first plate portion and a second plate portion formed as an integral body, the first plate portion being fixed to the lower end of the end surface of the denitrification catalyst on one side of the predetermined direction in a surface contact manner, and the second plate portion being bent from the lower end of the first plate portion and extending toward the one side of the predetermined direction. A boiler having a denitrification device as described in any one of claims 1 to 3. A method for installing a denitrification device is used for denitrifying gas. The denitrification device comprises: a plurality of support beams, a denitrification catalyst, a first sealing member and a second sealing member. The plurality of support beams extend in a predetermined direction and are arranged side by side at predetermined intervals along a direction intersecting the predetermined direction, i.e., the cross direction. The denitrification catalyst is mounted on the plurality of support beams in a manner of being mounted between the support beams arranged side by side along the cross direction and is used for denitrifying gas passing through the interior. The first sealing member extends in the cross direction and is used for sealing the gap formed between the denitrification catalyst and a member adjacent to the denitrification catalyst in the predetermined direction. The second sealing member is used to seal the gap between the end of the first sealing member in the cross direction and the support beam; the member adjacent to the denitrification catalyst in the predetermined direction is the denitrification catalyst or the shell constituting the outer shell of the denitrification device, and a pressing member clamped by the lower surface and the upper surface of the support beam is installed at the end of the lower surface of the denitrification catalyst in the cross direction. The installation method of the denitrification device has the following steps: the denitrification catalyst is placed on the support beam in such a way that the second sealing member covers the gap between the end of the first sealing member in the cross direction and the support beam.

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