SCR (Selective Catalytic Reduction) denitration tower

Abstract

The invention discloses an SCR (Selective Catalytic Reduction) denitration tower, aiming at solving the technical problem of simplifying a tower body structure when a pretreatment reactor and an SCR denitration reactor are integrated. The device comprises a plurality of reaction units which are vertically arranged, a lower packing layer and an upper packing layer are respectively arranged in any reaction unit, the lower packing layer is composed of a pretreatment catalyst, and the upper packing layer is composed of a denitration catalyst; an air inlet is formed in the cavity, located below the lower packing layer, in any reaction unit, and an air outlet is formed in the cavity, located above the upper packing layer, in any reaction unit. A plurality of reaction units are vertically arranged, and a lower packing layer (consisting of a pretreatment catalyst) and an upper packing layer (consisting of a denitration catalyst) are respectively arranged in each reaction unit. The two functions of pretreatment and denitration are achieved in the same reaction unit, the gas inlet is formed below the lower filler layer, and the gas outlet is formed above the upper filler layer, so that the reasonability of gas flow is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial furnace flue gas purification, and in particular to a steel tower container for SCR denitration, an SCR denitration system, and an SCR denitration tower. Background Art

[0002] The applicant provides an SCR denitration system in a Chinese patent document with publication number CN118491291A, comprising: an SCR denitration pretreatment device, wherein the SCR denitration pretreatment device comprises a pretreatment reactor, the pretreatment reactor has an air inlet for flue gas to be pretreated, an exhaust port for pretreated flue gas, a discharge port for a pretreatment catalyst regeneration liquid, and a pretreatment catalyst loading space located in the pretreatment reactor, and a pretreatment catalyst regeneration liquid spraying device for washing and regenerating the pretreatment catalyst in the pretreatment catalyst loading space is provided on the pretreatment reactor, and during pretreatment, flue gas mixed or not mixed with a denitration reducing agent enters the pretreatment reactor from the air inlet for flue gas to be pretreated, and then is discharged from the exhaust port for pretreated flue gas after denitration by the pretreatment catalyst, and the pretreatment is carried out. When the pretreatment catalyst is washed and regenerated, the regeneration liquid of the pretreatment catalyst is discharged from the regeneration liquid discharge port of the pretreatment catalyst, and the pretreatment catalyst adopts a carbon-based pretreatment catalyst; an SCR denitrification device, wherein the SCR denitrification device comprises an SCR denitrification reactor, the SCR denitrification reactor has an air inlet for flue gas to be denitrified, an exhaust port for flue gas that has been denitrified, and a denitrification catalyst filling space located in the SCR denitrification reactor, during denitrification, the flue gas mixed with the denitrification reducing agent enters the SCR denitrification reactor from the air inlet for flue gas to be denitrified, and then passes through the denitrification catalyst in the denitrification catalyst filling space and is discharged from the exhaust port for flue gas that has been denitrified; wherein the exhaust port for pretreated flue gas of the pretreatment reactor of the SCR denitrification pretreatment device is connected to the air inlet for flue gas to be denitrified of the SCR denitrification reactor of the SCR denitrification device. In the above-mentioned SCR denitrification system, the pretreatment reactor of the SCR denitrification pretreatment device can further remove sulfur dioxide in the flue gas to be denitrified by utilizing the principle of catalytic flue gas desulfurization, and remove dust in the flue gas to be denitrified by adsorption through a pretreatment catalyst (carbon-based pretreatment catalyst), thereby improving the subsequent SCR denitrification efficiency.

[0003] The problems of the above-mentioned SCR denitration system are: 1) When the tower design is adopted, the reactor cylinder (including the pretreatment reactor and the SCR denitration reactor) is constructed separately from the tower frame structure, which leads to a complex equipment structure, difficulty in controlling the engineering construction period, and a long construction period. 2) When the pretreatment reactor and the SCR denitration reactor are integrated into the same tower body, different pretreatment reactors or SCR denitration reactors will be distributed on each layer of the tower body (see Figure 10 of the specification in the above-mentioned patent document), resulting in a bulky equipment structure. Summary of the invention

[0004] One of the purposes of the present invention is to provide a steel tower container and an SCR denitration system for SCR denitration, so as to solve the technical problems of the existing SCR denitration pretreatment device / SCR denitration device having a complex structure, being difficult to control the engineering construction period, and having a long construction period. Another purpose of the present invention is to provide an improved SCR denitration tower, so as to solve the technical problem of simplifying the tower structure when integrating the pretreatment reactor and the SCR denitration reactor.

[0005] In the first aspect, a steel tower container for SCR denitrification is provided, comprising a steel outer cylinder and a steel inner support system arranged in the steel outer cylinder, wherein the bottom of the steel outer cylinder and the bottom of the steel inner support system are respectively installed on a concrete base; the steel inner support system comprises a central column and multiple layers of horizontal frames which are arranged at intervals along the axis direction of the central column, wherein the radial inner edge of each horizontal frame is welded to the outer side surface of the central column, and the radial outer edge of each horizontal frame is welded to the inner side surface of the steel outer cylinder, so that the central column, each horizontal frame and the steel outer cylinder are connected to form a steel tower; a part of these horizontal frames The horizontal frame is used as a partition support frame and is paved with a sealed partition, and another part of the horizontal frame is used as a catalyst support frame and is paved with a catalyst breathable support layer, and the catalyst breathable support layer is used to load a denitration catalyst / pretreatment catalyst; a reaction chamber is formed between any two adjacent layers of sealed partitions, and at least one catalyst breathable support layer is provided in any reaction chamber, and a chamber located below the at least one catalyst breathable support layer in any reaction chamber is provided with a lower air vent, and a chamber located above the at least one catalyst breathable support layer is provided with an upper air vent, and one of the lower air vent and the upper air vent of any reaction chamber is an air inlet and the other is an exhaust port.

[0006] In the steel tower container for SCR denitration in the first aspect above, an integrated steel tower is formed by welding the steel outer cylinder and the steel inner support system (including the central column and the horizontal frame). The horizontal frame is divided into two categories: one is used as a partition support frame to pave the sealed partition, and the other is used as a catalyst support frame to pave the catalyst permeable support layer. A reaction chamber is formed between two adjacent layers of sealed partitions, and each reaction chamber is provided with an air inlet and an exhaust port. This steel tower container design solves the technical problems of the existing SCR denitration pretreatment device / SCR denitration device with complex structure, difficult engineering construction cycle control and long construction cycle. The innovation of the steel tower container for SCR denitration in the first aspect above is mainly reflected in the structural integration design: by welding the steel outer cylinder and the steel inner support system (including the central column and the horizontal frame) into a whole, the problem of separate construction of the reactor cylinder and the tower frame in the traditional design is avoided. The steel outer cylinder and the steel inner support system jointly support the steel tower container, saving material consumption. The horizontal frames are divided into two categories: partition support frames and catalyst support frames, which are respectively paved with sealed partitions and catalyst breathable support layers, and reaction chambers are formed by adjacent sealed partitions. A catalyst breathable support layer and upper and lower air vents are arranged in each reaction chamber. This overall welded design simplifies the structure. The steel internal support system not only supports the force, but is also used to directly install sealed partitions and catalyst breathable support layers, which greatly simplifies the structure of the SCR denitrification pretreatment device / SCR denitrification device and shortens the construction period.

[0007] In a second aspect, an SCR denitration system is provided, comprising an SCR denitration pretreatment device and an SCR denitration device, wherein the SCR denitration device and the SCR denitration pretreatment device respectively adopt the steel tower container for SCR denitration of the first aspect mentioned above, and the exhaust port of any reaction chamber in the SCR denitration pretreatment device is connected to the air inlet of the corresponding reaction chamber in the SCR denitration device.

[0008] In the SCR denitration system of the second aspect above, both the SCR denitration pretreatment device and the SCR denitration device adopt the steel tower container for SCR denitration of the first aspect above, and the continuity of the treatment process is ensured by connecting the exhaust port of any reaction chamber in the SCR denitration pretreatment device with the air inlet of the corresponding reaction chamber in the SCR denitration device.

[0009] According to a third aspect, an SCR denitrification tower is provided, comprising a plurality of reaction units arranged vertically, wherein a lower packing layer and an upper packing layer are respectively provided in any one of the reaction units, wherein the lower packing layer is composed of a pretreatment catalyst, and the upper packing layer is composed of a denitrification catalyst; and an air inlet is provided in a chamber below the lower packing layer in any one of the reaction units, and an exhaust port is provided in a chamber above the upper packing layer in any one of the reaction units.

[0010] The SCR denitration tower of the third aspect can be a steel tower container, which includes a steel outer cylinder and a steel inner support system arranged in the steel outer cylinder, the bottom of the steel outer cylinder and the bottom of the steel inner support system are respectively installed on a concrete base; the steel inner support system has a central column and multiple layers of horizontal frames arranged at intervals along the axial direction of the central column, the radial inner edge of each horizontal frame is welded to the outer side of the central column, and the radial outer edge of each horizontal frame is welded to the inner side of the steel outer cylinder, so that the central column, each water The flat frame and the steel outer cylinder are connected to form a steel tower; a part of the horizontal frames are used as partition support frames and are paved with sealed partitions, and another part of the horizontal frames are used as catalyst support frames and are paved with catalyst breathable support layers; a reaction unit is formed between at least some of the different sealed partitions, and at least two layers of catalyst breathable support layers are arranged in any reaction unit, and the lower catalyst breathable support layer of the at least two catalyst breathable support layers is used to load the pretreatment catalyst, and the upper catalyst breathable support layer of the at least two catalyst breathable support layers is used to load the denitration catalyst.

[0011] In the SCR denitration tower of the third aspect, multiple reaction units are arranged vertically, and a lower packing layer (composed of a pretreatment catalyst) and an upper packing layer (composed of a denitration catalyst) are respectively arranged in each reaction unit. The two functions of pretreatment and denitration are realized in the same reaction unit, and the rationality of gas flow is ensured by arranging an air inlet below the lower packing layer and an exhaust port above the upper packing layer. This design solves the technical problem of simplifying the tower structure when integrating the pretreatment reactor and the SCR denitration reactor.

[0012] When the SCR denitration tower of the third aspect adopts a steel tower container for SCR denitration similar to the steel tower container for SCR denitration of the first aspect, the advantages of the steel tower container for SCR denitration of the first aspect are inherited.

[0013] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages provided by the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of this specification are used to assist in understanding the present invention. The contents provided in the drawings and their related descriptions in this specification may be used to explain the present invention, but shall not constitute improper limitations on the present invention.

[0015] Figure 1 The figure is a schematic diagram of the principle of an SCR denitration system according to an embodiment of the present invention.

[0016] Figure 2 for Figure 1 The schematic diagram of the structure of the SCR denitrification pretreatment device in the SCR denitrification system is shown.

[0017] Figure 3 for Figure 1 A schematic structural diagram of the SCR denitrification device in the SCR denitrification system shown.

[0018] Figure 4 for Figure 2 The schematic diagram of the structure of the partition support frame in the SCR denitration pretreatment device is shown.

[0019] Figure 5 for Figure 2 The schematic diagram of the structure of the catalyst support frame in the SCR denitration pretreatment device is shown.

[0020] Figure 6 The figure is a schematic diagram of the structure of an SCR denitrification tower according to an embodiment of the present invention.

[0021] Figure 7 The present invention is a schematic structural diagram of two adjacent layers of partition support frames and a sealing partition in an SCR denitration pretreatment device according to an embodiment of the present invention.

[0022] Figure 8 for Figure 7 A partial enlarged view of the structure shown at another angle.

[0023] Fig. 9 This is a partial enlarged view of the bottom of a steel tower container according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0025] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0026] The embodiments of the present invention involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0027] The terms "include", "comprises", "have" and any variations thereof in this specification and the corresponding claims and related parts are intended to cover non-exclusive inclusions. Other related terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0028] Figure 1 The figure is a schematic diagram of the principle of an SCR denitration system according to an embodiment of the present invention. Figure 2 for Figure 1 The schematic diagram of the structure of the SCR denitrification pretreatment device in the SCR denitrification system is shown. Figure 3 for Figure 1 A schematic structural diagram of the SCR denitrification device in the SCR denitrification system shown. Figure 4 for Figure 2 The schematic diagram of the structure of the partition support frame in the SCR denitration pretreatment device is shown. Figure 5 for Figure 2 The schematic diagram of the structure of the catalyst support frame in the SCR denitration pretreatment device is shown. Fig. 9 This is a partial enlarged view of the bottom of a steel tower container according to an embodiment of the present invention.

[0029] like Figure 1 As shown, the SCR denitration system includes an SCR denitration pretreatment device 1 and an SCR denitration device 2. The SCR denitration pretreatment device 1 is loaded with a pretreatment catalyst 11, and the function of the pretreatment catalyst 11 is the same as that of the pretreatment catalyst in the Chinese patent document of the applicant with publication number CN118491291A. The SCR denitration device 2 is loaded with a denitration catalyst 21.

[0030] like Figure 2 As shown, the SCR denitration pretreatment device 1 adopts a steel tower container, which includes a steel outer cylinder 31 and a steel inner support system 32 arranged in the steel outer cylinder 31, and the bottom of the steel outer cylinder 31 and the bottom of the steel inner support system 32 are respectively installed on a concrete base 33.

[0031] Among them, the steel internal support system 32 has a central column 321 and multiple layers of horizontal frames 322 arranged at intervals along the axial direction of the central column 321, the radial inner edge of each horizontal frame 322 is welded to the outer surface of the central column 321, and the radial outer edge of each horizontal frame 322 is welded to the inner side surface of the steel outer cylinder 31, so that the central column 321, each horizontal frame 322 and the steel outer cylinder 31 are connected to form a steel tower.

[0032] A portion of the horizontal frames 322 is used as a partition support frame and is paved with a sealing partition 323, and another portion of the horizontal frames 322 is used as a catalyst support frame and is paved with a catalyst breathable support layer, and the catalyst breathable support layer is used to load the pretreatment catalyst 11.

[0033] In addition, a reaction chamber is formed between any two adjacent layers of sealing partitions 323, at least one catalyst breathable support layer is provided in any reaction chamber, and a chamber located below the at least one catalyst breathable support layer in any reaction chamber is provided with a lower air vent 324, and a chamber located above the at least one catalyst breathable support layer is provided with an upper air vent 325, and one of the lower air vent 324 and the upper air vent 325 of any reaction chamber is an air inlet and the other is an exhaust port.

[0034] In the above steel tower container, the steel outer cylinder 31 and the steel inner support system 32 (including the central column 321 and the horizontal frame 322) are welded together to form an integrated steel tower. The horizontal frame 322 is divided into two types: one is used as a partition support frame (see Figure 5 ) paving sealing partition 323, and another type as catalyst support frame (see Figure 4 ) is paved with a catalyst permeable support layer. A reaction chamber is formed between two adjacent layers of sealed baffles 323, and each reaction chamber is provided with an air inlet and an exhaust port. The design of this steel tower container solves the technical problems of the existing SCR denitration pretreatment device with complex structure, difficult engineering construction cycle control and long construction cycle.

[0035] The innovation of the above-mentioned steel tower container is mainly reflected in the integrated structural design: by welding the steel outer cylinder 31 and the steel inner support system 32 (including the central column and the horizontal frame) into a whole, the problem of the reactor cylinder and the tower frame being built separately in the traditional design is avoided. The steel outer cylinder 31 and the steel inner support system 32 jointly support the steel tower container, saving the amount of materials. Among them, the horizontal frame 322 is divided into two types: the partition support frame and the catalyst support frame, which are respectively paved with the sealing partition and the catalyst breathable support layer, and the reaction chamber is formed by the adjacent sealing partitions. The catalyst breathable support layer and the upper and lower vents are arranged in each reaction chamber. This overall welding design simplifies the structure. The steel inner support system 32 not only plays a supporting force role, but is also used to directly install the sealing partition and the catalyst breathable support layer, which greatly simplifies the structure of the SCR denitration pretreatment device and shortens the construction period.

[0036] Specifically, if Figure 4-Figure 5 As shown, the horizontal frame 322 is mainly composed of a plurality of radial steel beams 322a and annular steel beams 322b connected between the radial steel beams 322a, one end of each of the radial steel beams is welded to the outer side of the central column 321 and the other end is welded to the inner side of the outer cylinder 31. The radial steel beams 322a and the annular steel beams 322b can be made of steel materials such as T-shaped steel and H-shaped steel.

[0037] Fig. 9 This is a partial enlarged view of the bottom of a steel tower container according to an embodiment of the present invention. Figure 2 The SCR denitration pretreatment device shown can be used as follows Fig. 9 Specifically, Fig. 9 As shown, an annular seat plate 34 is provided at the bottom edge of the steel outer cylinder 31, and the bottom of the side wall of the steel outer cylinder 31 is welded to the annular seat plate 34. A plurality of ribs 35 are circumferentially arranged at intervals on the annular seat plate 34, and the bottom edges of these ribs 35 are welded to the annular seat plate 34 and the inner sides are welded to the outer surface of the steel outer cylinder 31. The annular seat plate 34 is fixed to the concrete base 33 by anchor bolts 36, and the annular seat plate 34 is connected to the central column 321 by a bottom plate 37.

[0038] The bottom structure design of the above-mentioned steel tower container has multiple advantages: the annular seat plate 34 provides a uniform and stable force-bearing surface for the entire tower, and the overall rigidity is enhanced by cooperating with a plurality of rib plates 35 arranged at intervals in the circumferential direction. At the same time, the rib plates 35 strengthen the connection between the outer cylinder 31 and the annular seat plate 34 by welding, thereby improving the anti-overturning ability of the structure; the bottom plate 37 effectively connects the central column 321 and the annular seat plate 34 into a whole, forming a stable support system; a reliable connection with the concrete base 33 is achieved through anchor bolts 36, which is convenient for on-site installation and adjustment; the entire structural design is simple and clear, and the connection method is standardized, which not only ensures the construction quality, but also facilitates subsequent inspection and maintenance. At the same time, due to the use of a reasonable connection method, better cost-effectiveness is achieved.

[0039] like Figure 3 As shown, the SCR denitrification device 2 also adopts a steel tower container, which also includes a steel outer cylinder 31 and a steel inner support system 32 arranged in the steel outer cylinder 31, and the bottom of the steel outer cylinder 31 and the bottom of the steel inner support system 32 are respectively installed on a concrete base 33.

[0040] The steel inner support system 32 of the SCR denitrification device 2 has a central column 321 and multiple layers of horizontal frames 322 spaced apart along the axial direction of the central column 321. The radial inner edge of each horizontal frame 322 is welded to the outer surface of the central column 321, and the radial outer edge of each horizontal frame 322 is welded to the inner surface of the steel outer cylinder 31, so that the central column 321, each horizontal frame 322 and the steel outer cylinder 31 are connected to form a steel tower.

[0041] Among the above-mentioned horizontal frames 322, a part of the horizontal frames 322 is used as a partition support frame and is paved with a sealing partition 323, and another part of the horizontal frames 322 is used as a catalyst support frame and is paved with a catalyst breathable support layer, and the catalyst breathable support layer is used to load the denitration catalyst 21.

[0042] In addition, a reaction chamber is formed between any two adjacent layers of sealing partitions 323, at least one catalyst breathable support layer is provided in any reaction chamber, and a chamber located below the at least one catalyst breathable support layer in any reaction chamber is provided with a lower air vent 324, and a chamber located above the at least one catalyst breathable support layer is provided with an upper air vent 325, and one of the lower air vent 324 and the upper air vent 325 of any reaction chamber is an air inlet and the other is an exhaust port.

[0043] The central column 321 is made of a central ventilation pipe, the upper end of which extends upward from the steel outer cylinder, and the side walls of the central ventilation pipe are provided with openings serving as lower ventilation ports 324 of corresponding reaction chambers at intervals.

[0044] In addition, similarly, an annular seat plate 34 is provided at the bottom edge of the steel outer cylinder 31 of the SCR denitrification device 2, and the bottom of the side wall of the steel outer cylinder 31 is welded to the annular seat plate 34. A plurality of ribs 35 are circumferentially spaced on the annular seat plate 34, and the bottom edges of these ribs 35 are welded to the annular seat plate 34 and the inner edges are welded to the outer surface of the steel outer cylinder 31. The annular seat plate 34 is fixed to the concrete base 33 by anchor bolts 36, and the annular seat plate 34 is connected to the central column 321 by a bottom plate 37.

[0045] In the above-mentioned SCR denitration system, the exhaust port of any reaction chamber in the SCR denitration pretreatment device 1 is connected to the air inlet of the corresponding reaction chamber in the SCR denitration device 2 .

[0046] Specifically, each reaction chamber in the SCR denitration pretreatment device 1 corresponds to each reaction chamber in the SCR denitration device 2, so that the exhaust port of any reaction chamber in the SCR denitration pretreatment device 1 is connected to the air inlet of a corresponding reaction chamber in the SCR denitration device 2 through an independent flue. In addition, the two ends of the flue are connected to the corresponding exhaust port and air inlet through an expansion joint 4 (see Figure 1 ).

[0047] The above-mentioned SCR denitration system corresponds each reaction chamber of the SCR denitration pretreatment device 1 and the SCR denitration device 2 one by one and connects them through independent flues, ensuring that the airflows between the reaction chambers are independent of each other and avoiding airflow mixing, so that the reaction conditions in each reaction chamber can be accurately controlled; at the same time, the design of using expansion joints 4 to connect both ends of the independent flues can effectively compensate for the deformation caused by thermal expansion and contraction, ensuring the stability and sealing of the system operation; in addition, this modular one-to-one correspondence design also facilitates the maintenance and overhaul of the system. When a reaction chamber needs maintenance, only the corresponding flue can be closed without affecting the normal operation of other reaction chambers, thereby improving the maintainability and operation efficiency of the SCR denitration system.

[0048] In the SCR denitration pretreatment device 1 of the above-mentioned SCR denitration system, the lower air vent 324 and the upper air vent 325 of each reaction chamber are both arranged on the side wall of the steel outer cylinder 31; in the SCR denitration device 2 of the above-mentioned SCR denitration system, the upper air vent 325 of each reaction chamber is both arranged on the side wall of the steel outer cylinder 31, and the lower air vent 324 of each reaction chamber is distributed on the central column 321 (central air pipe).

[0049] When the SCR denitration system is in operation, the flue gas to be treated first enters each reaction chamber of the SCR denitration pretreatment device 1, enters the corresponding reaction chamber through the lower vent 324 arranged on the side wall of the steel outer cylinder 31 of the SCR denitration pretreatment device 1, flows upward through the catalyst air-permeable support layer equipped with the pretreatment catalyst 11, and then is discharged from the upper vent 325 on the side wall of the steel outer cylinder 31. The pretreated flue gas enters each reaction chamber of the SCR denitration device 2 through the independent flue and expansion joint 4, enters the corresponding reaction chamber through the upper vent 325 arranged on the side wall of the steel outer cylinder 31 of the SCR denitration device 2, flows downward through the catalyst air-permeable support layer equipped with the denitration catalyst 21, and finally enters the central vent pipe from the lower vent 324 on the central column 321 (central vent pipe) and flows out of the SCR denitration device 2 from bottom to top. This design allows each independent flue between the SCR denitration pretreatment device 1 and the SCR denitration device 2 to be arranged horizontally (see Figure 1 As shown), the smoke flow distance is shortened and the smoke flow resistance is reduced.

[0050] In other embodiments, the central column 321 in the SCR denitration pretreatment device 1 may also adopt a central ventilation pipe, and the flue gas to be treated may be distributed to each reaction chamber of the SCR denitration pretreatment device 1 through the central ventilation pipe.

[0051] Figure 7 The present invention is a schematic structural diagram of two adjacent layers of partition support frames and a sealing partition in an SCR denitration pretreatment device according to an embodiment of the present invention. Figure 8 for Figure 7 A partial enlarged view of the structure shown at another angle. Figure 8 The sealing partition 323 in the embodiment is made transparent so as to observe the horizontal frame 322 at the bottom of the sealing partition 323. Figure 7-Figure 8The invention mainly illustrates how to install a pre-treatment catalyst regeneration liquid spraying device and a method of conveying the pre-treatment catalyst regeneration liquid in an SCR denitration pre-treatment device. The applicant has introduced the working principle of the pre-treatment catalyst regeneration liquid spraying device in the Chinese patent document with the publication number CN118491291A. In the present application, the pre-treatment catalyst regeneration liquid spraying device can be installed on the horizontal frame 322 at the lower part of each sealing partition 323. In order to supply the pre-treatment catalyst regeneration liquid to the pre-treatment catalyst regeneration liquid spraying device and recover the pre-treatment catalyst regeneration liquid after spraying, a pre-treatment catalyst regeneration liquid input pipeline and a pre-treatment catalyst regeneration liquid recovery pipeline are provided in the central column 321. The pre-treatment catalyst regeneration liquid input pipeline is connected to the pre-treatment catalyst regeneration liquid spraying device through the first opening 321a on the central column 321 (disposed below the adjacent sealing partition 323), and the pre-treatment catalyst regeneration liquid recovery pipeline is connected to the second opening 321b on the central column 321 (disposed above the adjacent sealing partition 323). Thus, the pretreatment catalyst regeneration liquid will be transported through the pretreatment catalyst regeneration liquid input pipeline arranged inside the central column 321, and enter the pretreatment catalyst regeneration liquid spraying device installed under the horizontal frame 322 through the first opening 321a on the central column 321. The spraying device sprays the regeneration liquid onto the surface of the pretreatment catalyst 11 for regeneration. The used regeneration liquid flows to the sealing partition 323 below under the action of gravity, and enters the pretreatment catalyst regeneration liquid recovery pipeline through the second opening 321b on the central column 321 located above the sealing partition 323, thereby realizing the recycling of the pretreatment catalyst regeneration liquid.

[0052] The SCR denitration pretreatment device 1 and the SCR denitration device 2 of the above-mentioned SCR denitration system are independently arranged. Based on the structure of the above-mentioned steel tower container, the SCR denitration system will be further improved so that the SCR denitration pretreatment device 1 and the SCR denitration device 2 are combined into one.

[0053] Figure 6 Schematic diagram of the structure of an SCR denitration tower according to an embodiment of the present invention. Figure 6 As shown, the SCR denitration tower comprises a plurality of reaction units arranged vertically, wherein a lower packing layer and an upper packing layer are respectively provided in any reaction unit, wherein the lower packing layer is composed of a pretreatment catalyst 11, and the upper packing layer is composed of a denitration catalyst 21; and an air inlet is provided in a chamber below the lower packing layer in any reaction unit, and an exhaust port is provided in a chamber above the upper packing layer in any reaction unit. Optionally, a reaction unit is formed between any two adjacent layers of sealing baffles. In addition, the operating temperature of the pretreatment catalyst and the denitration catalyst is 120°C-200°C.

[0054] Specifically, the SCR denitration tower is a steel tower container, which includes a steel outer cylinder and a steel inner support system arranged in the steel outer cylinder, the bottom of the steel outer cylinder and the bottom of the steel inner support system are respectively installed on a concrete base; the steel inner support system has a central column and multiple layers of horizontal frames arranged at intervals along the axial direction of the central column, the radial inner edge of each horizontal frame is welded to the outer side of the central column, and the radial outer edge of each horizontal frame is welded to the inner side of the steel outer cylinder, so that the central column and each horizontal frame are welded to the inner side of the steel outer cylinder. and the steel outer cylinder are connected to form a steel tower; a part of the horizontal frames are used as partition support frames and are paved with sealed partitions, and another part of the horizontal frames are used as catalyst support frames and are paved with catalyst breathable support layers; a reaction unit is formed between at least some of the different sealed partitions, and at least two layers of catalyst breathable support layers are arranged in any reaction unit, and the lower catalyst breathable support layer of the at least two catalyst breathable support layers is used to load the pretreatment catalyst, and the upper catalyst breathable support layer of the at least two catalyst breathable support layers is used to load the denitration catalyst.

[0055] Optionally, the horizontal frame is mainly composed of a plurality of radial steel beams and annular steel beams connected between the radial steel beams, one end of the radial steel beams is welded to the outer surface of the central column and the other end is welded to the inner surface of the outer cylinder.

[0056] Optionally, an annular seat plate is provided on the bottom edge of the steel outer cylinder, the bottom of the side wall of the steel outer cylinder is welded to the annular seat plate, a plurality of rib plates are circumferentially spaced apart on the annular seat plate, the bottom edges of these rib plates are welded to the annular seat plate and the inner edges are welded to the outer surface of the steel outer cylinder, the annular seat plate is fixed to the concrete base by anchor bolts, and the annular seat plate is connected to the center column by a base plate.

[0057] Optionally, the central column is made of a central ventilation pipe, the upper end of which extends upward from the steel outer cylinder, and the side walls of the central ventilation pipe are provided with openings serving as air inlets or exhaust ports of corresponding reaction chambers at intervals.

[0058] Optionally, different catalyst permeable support layers in at least some of the reaction chambers are isolated from each other by providing a partition support frame and a corresponding sealing partition, and the chambers isolated by the sealing partition in the same reaction unit are connected by a pressurized air distribution channel. The pressurized air distribution channel is arranged on the outside of the steel outer cylinder and adopts an arc-shaped pipeline.

[0059] The above-mentioned SCR denitrification tower innovatively integrates the pretreatment catalyst 11 and the denitrification catalyst 21 in different packing layers within the same SCR denitrification tower, and realizes a compact design through multiple vertically arranged reaction units. The lower packing layer (pretreatment catalyst) and the upper packing layer (denitrification catalyst) in each reaction unit can operate collaboratively at similar working temperatures, and the structural design of the steel tower container (including central column, horizontal frame, sealing partition, etc.) is set up to reduce the equipment footprint and construction cost.

[0060] The pressurized air distribution channel is in the form of an arc-shaped pipe arranged on the outside of the steel outer cylinder, which is used to connect the chambers isolated by the sealed partition in the same reaction unit. When the flue gas enters from the air inlet at the bottom of the reaction unit, part of the gas will be compressed through the pressurized air distribution channel, which can promote a more uniform flow distribution of the gas in the reaction unit. The gas is first pretreated by the pretreatment catalyst in the lower packing layer, and then denitrified by the denitrification catalyst in the upper packing layer, and finally discharged from the exhaust port of the upper chamber. This design optimizes the airflow distribution by pressurizing the air distribution, ensuring that the catalyst layer can get uniform gas contact, thereby improving the processing efficiency of the entire reaction unit.

[0061] In addition, the above-mentioned SCR denitration tower can also be installed with a pre-treatment catalyst regeneration liquid spraying device in the aforementioned manner to realize the circulation of the pre-treatment catalyst regeneration liquid.

[0062] The above is a description of the relevant contents of the present invention. A person skilled in the art will be able to implement the present invention based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making creative work should fall within the scope of the present invention.

Claims

1. SCR denitration tower, characterized by: It comprises a plurality of reaction units arranged vertically, wherein a lower packing layer and an upper packing layer are respectively provided in any one of the reaction units, wherein the lower packing layer is composed of a pretreatment catalyst, and the upper packing layer is composed of a denitration catalyst; and a chamber located below the lower packing layer in any one of the reaction units is provided with an air inlet, and a chamber located above the upper packing layer in any one of the reaction units is provided with an exhaust port.

2. The SCR denitration tower according to claim 1, characterized in that: The steel tower container comprises a steel outer cylinder and a steel inner support system arranged in the steel outer cylinder, wherein the bottom of the steel outer cylinder and the bottom of the steel inner support system are respectively installed on a concrete foundation; The steel inner support system comprises a central column and multiple layers of horizontal frames spaced apart along the axis direction of the central column, wherein the radial inner edge of each horizontal frame is welded to the outer surface of the central column, and the radial outer edge of each horizontal frame is welded to the inner side surface of the steel outer cylinder, so that the central column, each horizontal frame and the steel outer cylinder are connected to form a steel tower; A portion of the horizontal frames is used as a baffle support frame and is paved with a sealing baffle, and another portion of the horizontal frames is used as a catalyst support frame and is paved with a catalyst air permeable support layer; A reaction unit is formed between at least some of the different sealing partitions, and at least two catalyst breathable support layers are arranged in any reaction unit. The lower catalyst breathable support layer of the at least two catalyst breathable support layers is used for loading the pretreatment catalyst, and the upper catalyst breathable support layer of the at least two catalyst breathable support layers is used for loading the denitration catalyst.

3. The SCR denitration tower according to claim 2, characterized in that: The horizontal frame is mainly composed of a plurality of radial steel beams and annular steel beams connected between the radial steel beams. One end of the radial steel beams is welded to the outer surface of the central column and the other end is welded to the inner surface of the outer cylinder.

4. The steel tower container for SCR denitration according to claim 2, characterized in that: An annular seat plate is provided on the bottom edge of the steel outer cylinder, the bottom of the side wall of the steel outer cylinder is welded to the annular seat plate, a plurality of rib plates are circumferentially arranged at intervals on the annular seat plate, the bottom edges of these rib plates are welded to the annular seat plate and the inner edges are welded to the outer surface of the steel outer cylinder, the annular seat plate is fixed to the concrete base by anchor bolts, and the annular seat plate is connected to the central column by a bottom plate.

5. The steel tower container for SCR denitration according to claim 1, characterized in that: The central column is made of a central ventilation pipe, the upper end of which extends upward from the steel outer cylinder, and the side walls of the central ventilation pipe are provided with openings serving as air inlets or exhaust ports of corresponding reaction chambers at intervals.

6. The steel tower container for SCR denitration according to claim 2, characterized in that: Any two adjacent sealed partitions form a reaction unit.

7. The steel tower container for SCR denitration according to claim 2, characterized in that: Different catalyst permeable support layers in at least some reaction chambers are isolated from each other by providing a partition support frame and a corresponding sealing partition, and the chambers isolated by the sealing partition in the same reaction unit are connected through a pressurized gas distribution channel.

8. The steel tower container for SCR denitration according to claim 7, characterized in that: The pressurized air distribution channel is arranged on the outside of the steel outer cylinder and adopts an arc-shaped pipeline.

9. The SCR denitration tower according to any one of claims 1 to 8, characterized in that: The working temperature of the pretreatment catalyst and the denitration catalyst is 120°C-200°C.

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