High-stability SCR denitration system

Abstract

The utility model relates to the technical field of denitration, in particular to a high-stability SCR (Selective Catalytic Reduction) denitration system, which comprises a denitration tower, a spraying mechanism and a dust removal mechanism, a liquid inlet pipe and a liquid outlet pipe are arranged at the side end of the denitration tower, a smoke exhaust pipe is arranged at the upper end of the denitration tower, an SCR reactor is arranged in the denitration tower, a catalyst is arranged in the SCR reactor, and the spraying mechanism and the dust removal mechanism are arranged in the denitration tower. A flow guide plate is installed in the denitration tower and located below the SCR reactor, the dust removal mechanism comprises a dust removal box, the dust removal box is installed at the side end of the denitration tower and communicates with the denitration tower, an ash hopper communicating with the denitration tower is arranged at the lower end of the denitration tower, an installation opening is formed in the upper end of the dust removal box, and the dust removal box communicates with the SCR reactor. A high-temperature electric dust remover is arranged in the dust removal box. The flue gas denitration device has the advantages that the flue gas dust concentration can be reduced, the flue gas flow distribution is uniform, the flue gas denitration efficiency is high, and the flue gas denitration effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of denitration, in particular to a high-stability SCR denitration system. Background Art

[0002] Denitrification refers to the process of removing nitrogen oxides from combustion flue gas. The importance of preventing environmental pollution has been sharply raised as a worldwide issue. The more mainstream processes in the world are divided into: SCR and SNCR. There is not much difference between these two processes except that the reaction temperature of SCR is lower than that of SNCR due to the use of catalysts.

[0003] In the process of flue gas denitrification, the SCR catalyst reacts with the flue gas to denitrify. During denitrification, the flue gas airflow is unevenly distributed and cannot fully react with the catalyst, which affects the denitrification effect of the flue gas. In addition, there is dust in the flue gas, which can easily clog the catalyst, thereby reducing the efficiency of flue gas denitrification. Utility Model Content

[0004] The purpose of the utility model is to provide a high-stability SCR denitrification system, which has the advantages of reducing the dust concentration in the flue gas and uniformly distributing the flue gas flow, so that the flue gas denitrification efficiency is high and the effect is good, thereby solving the problems raised by the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-stability SCR denitration system, comprising a denitration tower, a spray mechanism and a dust removal mechanism, wherein a liquid inlet pipe and a liquid outlet pipe are installed at the side end of the denitration tower, a smoke exhaust pipe is arranged at the upper end of the denitration tower, an SCR reactor is installed in the denitration tower, a catalyst is arranged in the SCR reactor, a guide plate is installed in the denitration tower, and the guide plate is located below the SCR reactor;

[0006] The dust removal mechanism comprises:

[0007] A dust removal box is installed at the side end of the denitrification tower, and the dust removal box is connected to the denitrification tower. The lower end of the denitrification tower is provided with an ash hopper connected to the denitrification tower. The upper end of the dust removal box is provided with a mounting opening, and a high-temperature electric precipitator is arranged in the dust removal box.

[0008] Preferably, the liquid inlet pipe is located above the liquid outlet pipe, the liquid inlet pipe and the liquid outlet pipe are connected to the denitration tower, and valves are provided on the liquid inlet pipe and the liquid outlet pipe.

[0009] Preferably, a smoke inlet pipe is installed at the side end of the dust removal box, and the smoke inlet pipe is connected to the dust removal box.

[0010] Preferably, a dust exhaust pipe is installed at the lower end of the ash hopper, and a valve is provided on the dust exhaust pipe.

[0011] Preferably, a cover plate is provided at the upper end of the dust removal box at the mounting opening, and mounting holes distributed in an array are provided on the cover plate. Threaded holes corresponding to the mounting holes are provided at the upper end of the dust removal box, and bolts are installed in the mounting holes and the inner threads of the threaded holes.

[0012] Preferably, the spray mechanism comprises:

[0013] A delivery pump and an annular pipe, wherein the annular pipe is installed in the denitrification tower, the annular pipe is located between the guide plate and the SCR reactor, the lower end and the inner wall of the annular pipe are installed with spray heads distributed in an array, the delivery pump is arranged on the outer surface of the denitrification tower, and a liquid extraction pipe and a delivery pipe are arranged on the delivery pump, the liquid extraction pipe is connected to the denitrification tower, and the end of the delivery pipe is connected to the annular pipe.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] 1. The flue gas enters the dust removal box through the flue gas inlet pipe. The dust in the flue gas can be removed by the high-temperature electrostatic precipitator. After the dust removal, the flue gas enters the denitrification tower for denitrification. After the flue gas dust removal, the dust concentration of the flue gas can be reduced to prevent the dust from clogging the catalyst, which can effectively improve the denitrification efficiency of the flue gas.

[0016] 2. The flue gas rises in the denitrification tower, and the guide plate can guide the flue gas flow to make the flue gas evenly distributed. The guided flue gas can evenly enter the SCR reactor, so that the flue gas and the catalyst can fully react, which can improve the denitrification effect of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0018] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0019] Figure 3 This is a schematic diagram of the dust removal mechanism structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the annular tube structure of the utility model;

[0021] Figure 5 It is a schematic diagram of the dust removal mechanism of the utility model when viewed from above.

[0022] The reference numerals and names in the figures are as follows:

[0023] 101. Denitrification tower; 102. Liquid inlet pipe; 103. Liquid outlet pipe; 104. Smoke exhaust pipe; 105. SCR reactor; 106. Guide plate; 201. Spray mechanism; 202. Delivery pump; 203. Liquid extraction pipe; 204. Delivery pipe; 205. Annular pipe; 206. Spray head; 301. Dust removal mechanism; 302. Dust removal box; 303. Cover plate; 304. Dust exhaust pipe; 305. Flue gas inlet pipe; 306. Installation port; 307. High-temperature electrostatic precipitator; 308. Ash hopper. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] Embodiment 1

[0026] See also Figures 1 to 5 The utility model provides an embodiment: a high-stability SCR denitration system, comprising:

[0027] A denitration tower 101, a spray mechanism 201 and a dust removal mechanism 301, wherein a liquid inlet pipe 102 and a liquid outlet pipe 103 are installed at the side end of the denitration tower 101, a smoke exhaust pipe 104 is arranged at the upper end of the denitration tower 101, an SCR reactor 105 is installed in the denitration tower 101, a catalyst is arranged in the SCR reactor 105, and a guide plate 106 is installed in the denitration tower 101, and the guide plate 106 is located below the SCR reactor 105;

[0028] The dust removal mechanism 301 comprises:

[0029] The dust removal box 302 is installed at the side end of the denitrification tower 101, and the dust removal box 302 is connected to the denitrification tower 101. The lower end of the denitrification tower 101 is provided with an ash hopper 308 connected to the denitrification tower 101. The upper end of the dust removal box 302 is provided with a mounting port 306, and a high-temperature electric precipitator 307 is arranged in the dust removal box 302.

[0030] In this embodiment, during use, the flue gas can enter the dust removal box 302 through the flue gas inlet pipe 305, and the dust in the flue gas can be removed by the operation of the high-temperature electrostatic precipitator 307. The dust can enter the ash hopper 308. After the dust removal, the flue gas can enter the denitrification tower 101, and the flue gas flow can be guided by the guide plate 106 to make the flue gas evenly distributed. During the rising process of the flue gas, it is denitrified once by spraying. The denitrified flue gas can enter the SCR reactor 105, and the flue gas can be denitrified again by reacting with the catalyst. After the denitrification, the flue gas can be discharged from the exhaust pipe 104.

[0031] Furthermore,

[0032] The liquid inlet pipe 102 is located above the liquid outlet pipe 103 . The liquid inlet pipe 102 and the liquid outlet pipe 103 are connected to the denitration tower 101 , and valves are provided on the liquid inlet pipe 102 and the liquid outlet pipe 103 .

[0033] Denitration liquid can be added into the denitration tower 101 through the liquid inlet pipe 102 , and the denitration liquid can be discharged from the liquid outlet pipe 103 after being used for a certain period of time.

[0034] Furthermore,

[0035] A smoke inlet pipe 305 is installed at the side end of the dust removal box 302 , and the smoke inlet pipe 305 is connected to the dust removal box 302 .

[0036] The flue gas may enter the dust removal box 302 through the flue gas inlet pipe 305 .

[0037] Furthermore,

[0038] A dust exhaust pipe 304 is installed at the lower end of the ash hopper 308 , and a valve is provided on the dust exhaust pipe 304 .

[0039] The ash hopper 308 is used to collect dust. When a lot of dust is collected in the ash hopper 308 , the valve on the dust exhaust pipe 304 is opened, and the dust in the ash hopper 308 can be discharged through the dust exhaust pipe 304 .

[0040] Furthermore,

[0041] The upper end of the dust removal box 302 is provided with a cover plate 303 at the mounting opening 306, and the cover plate 303 is provided with mounting holes distributed in an array. The upper end of the dust removal box 302 is provided with threaded holes corresponding to the mounting holes, and bolts are installed in the mounting holes and the inner threads of the threaded holes.

[0042] The installation opening 306 is used to install the high-temperature electrostatic precipitator 307 into the dust removal box 302, and the cover 303 can be set to close the installation opening 306. When the high-temperature electrostatic precipitator 307 needs maintenance and overhaul, the cover 303 can be removed by removing the bolts, thereby facilitating the maintenance and overhaul of the high-temperature electrostatic precipitator 307.

[0043] The SCR reactor 105 and the high-temperature electrostatic precipitator 307 in the present invention are well-known devices, and their working principles and circuit connections are well known to technicians in the field, and are conventional means or common knowledge, so they will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0044] Embodiment 2

[0045] See also Figures 1 to 5 The utility model provides an embodiment: a high-stability SCR denitration system. Compared with the first embodiment, the present embodiment further includes:

[0046] The spray mechanism 201 comprises:

[0047] A delivery pump 202 and an annular pipe 205, wherein the annular pipe 205 is installed in the denitration tower 101, and the annular pipe 205 is located between the guide plate 106 and the SCR reactor 105. The lower end and the inner wall of the annular pipe 205 are installed with spray heads 206 distributed in an array. The delivery pump 202 is arranged on the outer surface of the denitration tower 101, and the delivery pump 202 is provided with a liquid extraction pipe 203 and a delivery pipe 204. The liquid extraction pipe 203 is connected to the denitration tower 101, and the end of the delivery pipe 204 is connected to the annular pipe 205.

[0048] In this embodiment, during the denitration operation, the denitration liquid in the denitration tower 101 can be transported to the annular pipe 205 through the operation of the delivery pump 202, and the denitration liquid can be sprayed out from the spray head 206 of the annular pipe 205, so that the denitration liquid contacts the flue gas to react and denitration is performed.

[0049] The delivery pump 202 in the present invention is a well-known device, and its working principle and circuit connection are well known to technicians in this field, and are conventional means or common knowledge, so they will not be elaborated here. Those skilled in the art can make any selection according to their needs or convenience.

[0050] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A high-stability SCR denitration system, comprising a denitration tower (101), a spraying mechanism (201) and a dust removal mechanism (301), characterized in that: A liquid inlet pipe (102) and a liquid outlet pipe (103) are installed at the side end of the denitration tower (101), a smoke exhaust pipe (104) is arranged at the upper end of the denitration tower (101), an SCR reactor (105) is installed in the denitration tower (101), a catalyst is arranged in the SCR reactor (105), and a guide plate (106) is installed in the denitration tower (101), and the guide plate (106) is located below the SCR reactor (105); The dust removal mechanism (301) comprises: A dust removal box (302) is installed at the side end of the denitration tower (101), and the dust removal box (302) is connected to the denitration tower (101). The lower end of the denitration tower (101) is provided with an ash hopper (308) connected to the denitration tower (101). The upper end of the dust removal box (302) is provided with a mounting opening (306), and a high-temperature electric precipitator (307) is arranged in the dust removal box (302).

2. A high stability SCR denitration system according to claim 1, characterized in that: The liquid inlet pipe (102) is located above the liquid outlet pipe (103), the liquid inlet pipe (102) and the liquid outlet pipe (103) are connected to the denitration tower (101), and valves are provided on the liquid inlet pipe (102) and the liquid outlet pipe (103).

3. A high stability SCR denitration system according to claim 1, characterized in that: A smoke inlet pipe (305) is installed at the side end of the dust removal box (302), and the smoke inlet pipe (305) is connected to the dust removal box (302).

4. A high stability SCR denitration system according to claim 1, characterized in that: A dust exhaust pipe (304) is installed at the lower end of the ash hopper (308), and a valve is provided on the dust exhaust pipe (304).

5. A high stability SCR denitration system according to claim 1, characterized in that: The upper end of the dust removal box (302) is provided with a cover plate (303) at the mounting opening (306), and mounting holes distributed in an array are provided on the cover plate (303). The upper end of the dust removal box (302) is provided with threaded holes corresponding to the mounting holes, and bolts are installed in the mounting holes and the threads in the threaded holes.

6. A high stability SCR denitration system according to claim 1, characterized in that: The spray mechanism (201) comprises: A delivery pump (202) and an annular pipe (205), wherein the annular pipe (205) is installed in a denitration tower (101), the annular pipe (205) is located between a guide plate (106) and an SCR reactor (105), the lower end and the inner wall of the annular pipe (205) are both installed with spray heads (206) distributed in an array, the delivery pump (202) is arranged on the outer surface of the denitration tower (101), the delivery pump (202) is provided with a liquid extraction pipe (203) and a delivery pipe (204), the liquid extraction pipe (203) is communicated with the denitration tower (101), and the end of the delivery pipe (204) is connected to the annular pipe (205).

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