Cement kiln SCR (Selective Catalytic Reduction) reactor

Abstract

The utility model discloses a cement kiln SCR (Selective Catalytic Reduction) reactor, which relates to the technical field of SCR reactors, and comprises an SCR reactor main body, the SCR reactor main body consists of a circulation area and a catalyst layer treatment area, the circulation area is communicated with the catalyst layer treatment area, a reactor flow equalizing unit is arranged in the circulation area, and the reactor flow equalizing unit comprises a flow guide box, a flow guide cavity is formed in the flow guide box, a single flow guide grid is arranged in the flow guide cavity, a double flow guide grid is arranged in the middle of the flow guide cavity, a double-layer airflow uniform distribution plate is arranged at the joint of the bottom of the flow guide cavity and the catalyst layer treatment area, and an expansion opening is connected to the top of the flow guide box. According to the utility model, the reactor flow equalizing unit is internally provided with the single flow guide grating and the double flow guide grating, so that the pressure loss is small, the flue gas gathered in the center of a catalyst layer treatment area is guided to be quickly diffused to the periphery, and the throttling effect of the flue gas is completed through the characteristics of the double-layer airflow uniform distribution plate which is matched with the double-layer airflow uniform distribution plate; and uniform diffusion of the flue gas in the flue is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of SCR reactors, in particular to an SCR reactor for a cement kiln. Background Art

[0002] Cement kiln bricks are made of fly ash, coal cinder, coal gangue, tailings slag, chemical slag or natural sand, beach mud, etc. as the main raw materials, with cement as the coagulant, and are manufactured by high-temperature calcination. Usually, they are batch-fired through a cement kiln. However, a large amount of flue gas is generated when the cement kiln is working, and the flue gas is subjected to denitrification treatment through an SCR reactor.

[0003] During the use of the existing SCR reactor for a cement kiln, according to requirements, the clean flue gas outlet pipe of the SCR reactor is connected to the conveying pipe. During the connection process between the two, by fitting the end of the conveying pipe to the end of the clean flue gas outlet pipe, and according to the positions of multiple installation holes opened at the end of the clean flue gas outlet pipe, the position of the conveying pipe is moved so that the multiple installation holes between the two are aligned. During the process of moving the position of the conveying pipe, the installation holes will be blocked, causing certain inconvenience during installation.

[0004] As disclosed in a cement kiln SCR reactor with the Chinese patent publication number CN219701570U, through the designed connecting mechanism of this SCR reactor, it improves the problem that during the installation of the clean flue gas outlet pipe and the conveying pipe of the original SCR reactor, due to the blocking of multiple installation holes during alignment, there is a certain inconvenience during installation. By setting a connecting mechanism at the connection between the clean flue gas outlet pipe and the conveying pipe, the clean flue gas outlet pipe and the conveying pipe are preliminarily connected through the connecting mechanism during the installation process, and at the same time, the multiple installation holes between the two are aligned, increasing the installation convenience.

[0005] There are the following problems with respect to the prior art:

[0006] In this SCR reactor, the reaction flue gas in the inlet flue lacks corresponding optimized design, and its inlet flue cannot play a role in guiding the flowing reaction flue gas, so that the reaction flue gas cannot be evenly diffused in the flue, resulting in a slow denitrification treatment efficiency of the flue gas. And the flue gas flow velocity at the catalyst cross-section in this SCR reactor mainly depends on the design of the catalyst cross-section itself but cannot improve the uniformity of the flue gas velocity distribution. Therefore, in the case of flue gas with too fast or too slow flow, the uniformity of the flue gas velocity does not meet the requirements of the catalyst. Summary of the Utility Model

[0007] The utility model provides an SCR reactor for a cement kiln to solve the problems raised in the above background art.

[0008] To solve the above technical problems, the technical solution adopted by the present utility model is as follows:

[0009] A cement kiln SCR reactor, including an SCR reactor main body, the SCR reactor main body consists of a flow-through area and a catalyst layer treatment area, the flow-through area is communicated with the catalyst layer treatment area, a reactor flow equalization unit is arranged in the flow-through area, an anti-blocking unit is arranged in the catalyst layer treatment area, the reactor flow equalization unit is installed in the flow-through area, and the anti-blocking unit is installed in the catalyst layer treatment area;

[0010] The reactor flow equalization unit includes a diversion box, a diversion cavity is arranged in the diversion box, a single diversion grid is arranged in the diversion cavity, the single diversion grid is located at the reactor inlet expansion section and at the top of the diversion cavity, a double diversion grid is arranged in the middle of the diversion cavity, a double-layer air flow distribution plate is arranged at the connection between the bottom of the diversion cavity and the catalyst layer treatment area, and an expansion port is connected to the top of the diversion box.

[0011] Among them, the present utility model has the advantage of small pressure loss generated by the single diversion grid and the double diversion grid arranged in the reactor flow equalization unit, thereby guiding the flue gas gathered in the center of the catalyst layer treatment area to quickly diffuse to the surroundings, playing a diffusion function on the cross-section flue gas of the catalyst layer treatment area, and cooperating with the arranged double-layer air flow distribution plate to complete the throttling effect of the flue gas through its own characteristics, so that the flue gas containing nitrogen oxides disrupts its original distribution characteristics and then makes the overall flue gas flow velocity tend to be consistent, completing the uniform diffusion of the flue gas in the flue.

[0012] A further improvement of the technical solution of the present utility model is that: the diversion box is fixedly installed on the catalyst layer treatment area, the single diversion grid is fixedly installed in the diversion box, the double diversion grid is welded in the diversion cavity, the expansion port is fixedly installed at the top of the diversion box, and the double-layer air flow distribution plate is fixedly connected to the diversion box.

[0013] A further improvement of the technical solution of the present utility model is that: ventilation holes are arranged on the double-layer air flow distribution plate, the hydraulic diameter D of the ventilation holes is 50 mm, and the opening rate of the double-layer air flow distribution plate is greater than 50%.

[0014] A further improvement of the technical solution of the present utility model is that: an inlet flue is arranged at the top of the diversion box, a baffle door is arranged at the connection between the inlet flue and the diversion box, and the expansion port is installed at one end of the inlet flue in contact with the diversion box, the baffle door is welded in the inlet flue, the other end of the inlet flue is connected to a waste heat pipeline, and the waste heat pipeline is communicated with a temperature adjustment pipeline.

[0015] A further improvement of the technical solution of the present utility model lies in that: the anti-blocking unit includes a treatment box, a treatment cavity is arranged in the treatment box, a catalyst layer is filled in the treatment cavity in an array, a drive shaft is arranged between adjacent catalyst layers, a connecting piece is arranged on the drive shaft, a spring is arranged on the connecting piece, the other end of the spring is connected with a dredging block, and the other end of the drive shaft is connected with a rotating motor.

[0016] Among them, in the present utility model, the anti-blocking unit arranged in the catalyst layer treatment area enables the cross-section of the catalyst layer to complete the collision of the dredging block through the centrifugal force generated by the rotation of the drive shaft after treating a large flow of flue gas in the treatment reaction, so that the cross-section of the catalyst layer undergoes a slight deformation, and thus the cross-section is blocked by particulate matter, ensuring the normal operation of the catalytic process of the SCR reactor.

[0017] A further improvement of the technical solution of the present utility model lies in that: the treatment box is fixedly installed on the top of the diversion box, and the catalyst layer is installed in the treatment cavity, the drive shaft is rotatably connected with the treatment box, the drive shaft is fixedly connected with the connecting piece, the connecting piece is fixedly connected with the spring, the spring is fixedly connected with the dredging block, and the drive shaft is connected with the rotating motor through a coupling.

[0018] Due to the adoption of the above technical solution, the technical progress achieved by the present utility model compared with the prior art is:

[0019] 1. The present utility model provides a cement kiln SCR reactor. By arranging a single diversion grid and a double diversion grid in the reactor flow equalization unit, which has the advantage of small pressure loss, the flue gas gathered in the center of the catalyst layer treatment area is guided to quickly diffuse to the surrounding, playing a diffusion function on the cross-section of the catalyst layer treatment area, and cooperating with the arranged double-layer air flow distribution plate to complete the throttling of the flue gas through its own characteristics, so that the flue gas containing nitrogen oxides disrupts its original distribution characteristics and then makes the overall flue gas flow velocity tend to be consistent, completing the uniform diffusion of the flue gas in the flue.

[0020] 2. The present utility model provides a cement kiln SCR reactor. By arranging the anti-blocking unit in the catalyst layer treatment area, after treating a large flow of flue gas in the treatment reaction, the cross-section of the catalyst layer completes the collision of the dredging block through the centrifugal force generated by the rotation of the drive shaft, so that the cross-section of the catalyst layer undergoes a slight deformation, and thus the cross-section is blocked by particulate matter, ensuring the normal operation of the catalytic process of the SCR reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the whole of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the reactor flow equalization unit of the present utility model;

[0023] Figure 3 This is a schematic structural diagram of the flow equalizing unit of the reactor of the present utility model;

[0024] Figure 4 This is a schematic structural diagram of the anti-blocking unit of the present utility model.

[0025] In the figure: 101, flow-through area; 102, catalyst layer treatment area; 201, diversion box; 202, single diversion grid; 203, double diversion grid; 204, double-layer air flow equalizing plate; 205, expansion port; 206, inlet flue; 207, waste heat pipeline; 208, temperature adjustment pipeline; 301, treatment box; 302, catalyst layer; 303, drive shaft; 304, connecting piece; 305, spring; 306, dredging block; 307, rotating motor. Specific implementation manners

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] Please refer to Figures 1-4 , the present utility model provides a technical solution:

[0028] Embodiment 1:

[0029] A cement kiln SCR reactor includes an SCR reactor main body. The SCR reactor main body consists of a flow-through area 101 and a catalyst layer treatment area 102. The flow-through area 101 is communicated with the catalyst layer treatment area 102. A reactor flow equalizing unit is arranged in the flow-through area 101, and an anti-blocking unit is arranged in the catalyst layer treatment area 102. The reactor flow equalizing unit is installed in the flow-through area 101, and the anti-blocking unit is installed in the catalyst layer treatment area 102;

[0030] The reactor flow equalizing unit includes a diversion box 201. A diversion cavity is arranged in the diversion box 201. A single diversion grid 202 is arranged in the diversion cavity. The single diversion grid 202 is located at the reactor inlet expansion section and at the top of the diversion cavity. A double diversion grid 203 is arranged in the middle of the diversion cavity. A double-layer air flow equalizing plate 204 is arranged at the connection between the bottom of the diversion box 201 and the catalyst layer treatment area 102. An expansion port 205 is connected to the top of the diversion box 201.

[0031] The utility model has the advantage of small pressure loss generated by a single flow guiding grid 202 and a double flow guiding grid 203 arranged in the reactor flow equalizing unit, so as to guide the flue gas gathered at the center of the catalyst layer treatment area 102 to quickly diffuse around, play a diffusion function on the cross-section flue gas of the catalyst layer treatment area 102, and cooperate with the arranged double-layer air flow equalizing plate 204 to complete the throttling of the flue gas through its own characteristics, so that the flue gas containing pins disrupts its original distribution characteristics and then makes the overall flue gas flow velocity tend to be consistent, completing the uniform diffusion of the flue gas in the flue.

[0032] The flow guiding box 201 is fixedly installed on the catalyst layer treatment area 102. The single flow guiding grid 202 is fixedly installed in the flow guiding box 201. The double flow guiding grid 203 is welded in the flow guiding cavity. The expansion port 205 is fixedly installed at the top of the flow guiding box 201. The double-layer air flow equalizing plate 204 is fixedly connected with the flow guiding box 201.

[0033] Vent holes are arranged on the double-layer air flow equalizing plate 204. The hydraulic diameter D of the vent holes is 60 mm, and the opening ratio of the double-layer air flow equalizing plate 204 is greater than 50%.

[0034] An inlet flue 206 is arranged at the top of the flow guiding box 201. A baffle door is arranged at the connection between the inlet flue 206 and the flow guiding box 201. The expansion port 205 is installed at one end of the inlet flue 206 contacting the flow guiding box 201. The baffle door is welded in the inlet flue 206. The other end of the inlet flue 206 is connected with a waste heat pipe 207, and the waste heat pipe 207 is communicated with a temperature regulating pipe 208.

[0035] Embodiment 2:

[0036] On the basis of Embodiment 1: The anti-blocking unit includes a treatment box 301. A treatment cavity is arranged in the treatment box 301. Catalyst layers 302 are filled in the treatment cavity in an array. A driving shaft 303 is arranged between adjacent catalyst layers 302. A connecting piece 304 is arranged on the driving shaft 303. A spring 305 is arranged on the connecting piece 304. The other end of the spring 305 is connected with a dredging block 306. The other end of the driving shaft 303 is connected with a rotating motor 307.

[0037] The utility model completes the collision of the dredging block 306 through the centrifugal force generated by the rotation of the driving shaft 303 after the catalyst layer 302 cross-section processes a large flow of flue gas through the anti-blocking unit arranged in the catalyst layer treatment area 102, so that the cross-section of the catalyst layer 302 is slightly deformed, and thus the cross-section is blocked by particulate matter, ensuring the normal operation of the SCR reactor catalytic process.

[0038] The processing box 301 is fixedly installed on the top of the diversion box 201, and the catalyst layer 302 is installed inside the processing chamber. The drive shaft 303 is rotatably connected to the processing box 301. The drive shaft 303 is fixedly connected to the connecting member 304. The connecting member 304 is fixedly connected to the spring 305. The spring 305 is fixedly connected to the dredging block 306. The drive shaft 303 is connected to the rotating motor 307 through a coupling.

[0039] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A cement kiln SCR reactor, comprising an SCR reactor body, characterized in that: The SCR reactor body consists of a flow region (101) and a catalyst layer processing region (102); the flow region (101) is connected to the catalyst layer processing region (102); a reactor flow balancing unit is arranged in the flow region (101); an anti-blocking unit is arranged in the catalyst layer processing region (102); the reactor flow balancing unit is installed in the flow region (101); and the anti-blocking unit is installed in the catalyst layer processing region (102); The reactor flow equalizing unit comprises a flow guide box (201), a flow guide cavity is arranged in the flow guide box (201), a single flow guide grid (202) is arranged in the flow guide cavity, the single flow guide grid (202) is located at the reactor inlet expansion section and at the top of the flow guide cavity, a double flow guide grid (203) is arranged in the middle of the flow guide cavity, a double-layer airflow equalizing plate (204) is arranged at the connection between the bottom of the flow guide cavity and the catalyst layer processing area (102), and the top of the flow guide box (201) is connected to an expansion port (205).

2. A cement kiln SCR reactor according to claim 1, characterized in that: The guide box (201) is fixedly installed on the catalyst layer processing area (102), the single guide grid (202) is fixedly installed in the guide box (201), the double guide grid (203) is welded in the guide cavity, the expansion port (205) is fixedly installed at the top of the guide box (201), and the double-layer airflow distribution plate (204) is fixedly connected to the guide box (201).

3. A cement kiln SCR reactor according to claim 1, characterized in that: The double-layer airflow distribution plate (204) is provided with ventilation holes, the hydraulic diameter of the ventilation holes is D=60 mm, and the opening rate of the double-layer airflow distribution plate (204) is greater than 50 percent.

4. A cement kiln SCR reactor according to claim 1, characterized in that: An inlet flue (206) is arranged at the top of the guide box (201); a baffle door is arranged at the connection between the inlet flue (206) and the guide box (201); the expansion opening (205) is installed at one end of the inlet flue (206) contacting the guide box (201); the baffle door is welded inside the inlet flue (206); the other end of the inlet flue (206) is connected to a waste heat pipe (207); and the waste heat pipe (207) is connected to a temperature regulating pipe (208).

5. A cement kiln SCR reactor according to claim 1, characterized in that: The anti-clogging unit comprises a processing box (301), wherein a processing chamber is arranged in the processing box (301), wherein the processing chamber is filled with an array of catalyst layers (302), wherein a driving shaft (303) is arranged between adjacent catalyst layers (302), wherein a connecting piece (304) is arranged on the driving shaft (303), wherein a spring (305) is arranged on the connecting piece (304), wherein the other end of the spring (305) is connected to a dredging block (306), and wherein the other end of the driving shaft (303) is connected to a rotating motor (307).

6. A cement kiln SCR reactor according to claim 5, characterized in that: The processing box (301) is fixedly installed on the top of the guide box (201), and the catalyst layer (302) is installed in the processing chamber. The driving shaft (303) is rotatably connected to the processing box (301), the driving shaft (303) is fixedly connected to the connecting piece (304), the connecting piece (304) is fixedly connected to the spring (305), the spring (305) is fixedly connected to the dredging block (306), and the driving shaft (303) is connected to the rotating motor (307) via a coupling.

Images