An exhaust gas treatment device

Abstract

The present invention belongs to the technical field of tail gas treatment, and discloses a tail gas treatment device and method, which includes a second cavity and a third cavity. An primary reactor is installed inside the second cavity. The input end of the primary reactor is connected in parallel with a first conduit and a fourth conduit. The output end of the primary reactor is connected in parallel with a second conduit and a third conduit. The output ends of the second conduit and the third conduit are both connected to the input end of the third cavity. Two secondary reactors are installed on both sides inside the third cavity, and exhaust ports are provided on both sides of the third cavity. The present invention is provided with two reactors, and the tail gas to be treated is conveyed into the reactors through two parallel channels. On the one hand, it enables the tail gas to fully react in the reactors. On the other hand, it reduces the impact of the tail gas on the reactors. The reaction efficiency is improved by the diversion cover provided to divert and diffuse the tail gas.

Description

Technical Field

[0001] The present invention belongs to the technical field of tail gas treatment, and particularly relates to a tail gas treatment device. Background Art

[0002] Tail gas refers to the waste gas discharged during the operation of motor vehicles or other equipment. In modern civilization, cars, trains, high-speed rails, etc. have become indispensable means of transportation for humans. However, with the rapid development of the automotive, railway, and high-speed rail industries, as well as the continuous increase in production and ownership, it has also brought about air pollution, namely tail gas pollution.

[0003] A tail gas treatment device is a device that purifies tail gas under the action of a catalyst to reduce environmental pollution.

[0004] In the existing tail gas treatment device, the tail gas enters each reactor in a direct discharge manner. This method results in a short residence time of the tail gas in the reactor, insufficient contact with the reactor, low reaction efficiency, and is also likely to cause a large impact on the reactor. Summary of the Invention

[0005] The purpose of the present invention is to provide a tail gas treatment device to solve the problems of low reaction efficiency and easy impact on the reactor mentioned in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A tail gas treatment device includes a second cavity and a third cavity. An primary reactor is installed inside the second cavity. The input end of the primary reactor is connected in parallel with a first conduit and a fourth conduit. The output end of the primary reactor is connected in parallel with a second conduit and a third conduit. The output ends of the second conduit and the third conduit are both connected to the input end of the third cavity. Secondary reactors are installed on both sides inside the third cavity, and exhaust ports are provided on both sides of the third cavity.

[0007] Preferably, as a tail gas treatment device of the present invention, it further includes a first cavity. The output end of the first cavity is connected to the input ends of the first conduit and the fourth conduit. A draft fan is installed at the bottom of the first cavity. An air inlet is provided at the output end of the draft fan, and the draft fan is connected to the first cavity through the air inlet.

[0008] Preferably, as a tail gas treatment device of the present invention, the first conduit and the first cavity, the fourth conduit and the first cavity, the first conduit and the second cavity, and the fourth conduit and the second cavity are all connected through first flange plates.

[0009] Preferably, as a tail gas treatment device of the present invention, the second conduit and the second cavity, and the third conduit and the second cavity are all connected through second flange plates.

[0010] Preferably, as a tail gas treatment device of the present invention, flow guiding covers are installed at the joints of the first conduit and the primary reactor and at the joints of the second conduit and the primary reactor. The flow guiding cover is composed of a plurality of hollow frustum-shaped flow guiding plates with different sizes, and the plurality of flow guiding plates are arranged from small to large in the gas flow direction.

[0011] Preferably, as a tail gas treatment device of the present invention, a plurality of air outlet holes are provided at the tails of the second conduit and the third conduit.

[0012] Preferably, as a tail gas treatment device of the present invention, medicine dispensers are installed above the second conduit and the third conduit.

[0013] The present invention provides a tail gas treatment method, including the steps:

[0014] S100 The tail gas to be treated is pumped in by an induced draft fan and is transported to the inside of the first cavity through the air inlet.

[0015] S200 The tail gas in the first cavity is respectively transported to the primary reactor through the first conduit and the fourth conduit for primary purification treatment.

[0016] S300 The tail gas treated by the primary reactor is respectively transported to the inside of the third cavity through the second conduit and the third conduit.

[0017] S400 The tail gas entering the third cavity is input to both sides into the secondary reactor. After being treated by the secondary reactor, it is discharged through the exhaust ports provided on both sides of the third cavity.

[0018] Preferably, as a tail gas treatment method of the present invention, the step that the tail gas in the first cavity is respectively transported to the primary reactor through the first conduit and the fourth conduit for primary purification treatment specifically includes the steps:

[0019] S210 The tail gas in the first conduit and the fourth conduit is guided into the primary reactor through the flow guiding cover.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention is provided with two reactors, and the tail gas to be treated is transported into the reactors through two parallel channels. On the one hand, it enables the tail gas to fully react in the reactors, and on the other hand, it reduces the impact of the tail gas on the reactors. By providing the flow guiding cover to guide and diffuse the tail gas transported by the first conduit and the second conduit, the contact area between the tail gas and the primary reactor is increased, and the reaction efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a top view of the present invention;

[0022] Figure 2 is of the present inventionFigure 1 Cross-sectional view;

[0023] Figure 3 For the present invention Figure 1 Front view;

[0024] Figure 4 Schematic diagram of the gas flow direction of the present invention;

[0025] 1. Induced draft fan; 2. Air inlet; 3. First cavity; 4. First conduit; 5. Primary reactor; 6. Second cavity; 7. Dosage dispenser; 8. Second conduit; 9. Third cavity; 10. Exhaust port; 11. Secondary reactor; 12. First flange; 13. Third conduit; 14. Fourth conduit; 15. Air outlet hole; 16. Second flange; 17. Flow guide cover. Specific embodiments

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

[0027] Please refer to Figures 1-3 As shown in the figure, the present invention provides the following technical solution: An exhaust gas treatment device includes a second cavity 6 and a third cavity 9. A primary reactor 5 is installed inside the second cavity 6. The input end of the primary reactor 5 is connected in parallel with a first conduit 4 and a fourth conduit 14. The output end of the primary reactor 5 is connected in parallel with a second conduit 8 and a third conduit 13. The output ends of the second conduit 8 and the third conduit 13 are both connected to the input end of the third cavity 9. Secondary reactors 11 are installed on both sides inside the third cavity 9, and exhaust ports 10 are provided on both sides of the third cavity 9.

[0028] The present invention is provided with two reactors, and the exhaust gas to be treated is conveyed into the reactors through two parallel channels. On the one hand, it enables the exhaust gas to react fully in the reactors, and on the other hand, it reduces the impact of the exhaust gas on the reactors.

[0029] As Figure 3 shown, specifically, it further includes a first cavity 3. The output end of the first cavity 3 is connected to the input end of the first conduit 4 and the input end of the fourth conduit 14. An induced draft fan 1 is installed at the bottom of the first cavity 3. An air inlet 2 is provided at the output end of the induced draft fan 1, and the induced draft fan 1 is connected to the first cavity 3 through the air inlet 2.

[0030] In this embodiment, there are two induced draft fans 1 in total. The two induced draft fans 1 are arranged in parallel below the first cavity 3 and are used to convey and boost the tail gas into the first cavity 3. After the tail gas is conveyed into the first cavity 3 through the air inlet 2, it completes primary mixing and buffering in the first cavity 3, and then enters the second cavity 6 through the first conduit 4 and the fourth conduit 14 arranged in parallel for secondary buffering, and undergoes primary treatment in the primary reactor 5 in the second cavity 6. After the treatment is completed, the tail gas then enters the third cavity 9 through the second conduit 8 and the third conduit 13 arranged in parallel, undergoes three - stage buffering in the third cavity 9, and then is respectively input to both sides into the secondary reactor 11 for secondary treatment, and finally is discharged from the exhaust ports 10 arranged on both sides of the secondary reactor 11.

[0031] Specifically, the first conduit 4 and the first cavity 3, the fourth conduit 14 and the first cavity 3, the first conduit 4 and the second cavity 6, and the fourth conduit 14 and the second cavity 6 are all connected through the first flange 12.

[0032] Specifically, the second conduit 8 and the second cavity 6, and the third conduit 13 and the second cavity 6 are all connected through the second flange 16.

[0033] It should be noted that in this embodiment, the flange is used in cooperation with bolts to achieve the connection and disassembly between components.

[0034] Specifically, flow - guiding covers 17 are installed at the connection parts of the first conduit 4 and the primary reactor 5 and at the connection parts of the fourth conduit 14 and the primary reactor 5. The flow - guiding cover 17 is composed of a plurality of hollow frustum - shaped flow - guiding plates with different sizes, and the plurality of flow - guiding plates are arranged from small to large according to the gas flow direction.

[0035] In this embodiment, the flow - guiding cover 17 is used to guide and diffuse the tail gas conveyed by the first conduit 4 and the fourth conduit 14, increasing the contact area between the tail gas and the primary reactor and improving the reaction efficiency.

[0036] Specifically, a number of air outlet holes 15 are opened at the tails of the second conduit 8 and the third conduit 13.

[0037] Specifically, a dosing device 7 is installed above both the second conduit 8 and the third conduit 13.

[0038] It should be noted that in this embodiment, the first cavity 3 is a manifold cavity, the third conduit 13 and the fourth conduit 14 are urea mixing pipes, the dosing device 7 is a multi - stage urea mixer, the dosing device 7 is used to spray urea into the third conduit 13 and the fourth conduit 14 according to requirements, both the primary reactor 5 and the secondary reactor 11 are SCR catalyst cavities, and the third cavity 9 is a urea mixing cavity for mixing the tail gas with urea.

[0039] Please refer to Figure 4As described above, the present invention provides an exhaust gas treatment method, including the steps:

[0040] S100 The exhaust gas to be treated is pumped by the induced draft fan 1 and transported to the inside of the first cavity 3 through the air inlet 2.

[0041] S200 The exhaust gas in the first cavity 3 is respectively transported to the primary reactor 5 through the first conduit 4 and the fourth conduit 14 for primary purification treatment.

[0042] S300 The exhaust gas treated by the primary reactor 5 is respectively transported to the inside of the third cavity 9 through the second conduit 8 and the third conduit 13.

[0043] S400 The exhaust gas entering the third cavity 9 is input to both sides into the secondary reactor 11. After being treated by the secondary reactor 11, it is discharged through the exhaust ports 10 opened on both sides of the third cavity 9.

[0044] Specifically, for S200, the exhaust gas in the first cavity 3 is respectively transported to the primary reactor 5 through the first conduit 4 and the fourth conduit 14 for primary purification treatment, which specifically includes the steps:

[0045] S210 The exhaust gas in the first conduit 4 and the fourth conduit 14 is guided into the primary reactor 5 through the flow guide cover 17.

[0046] 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 terms "include", "comprise" or any other variant thereof are 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 also includes elements inherent to such process, method, article or device.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust gas treatment device, characterized in that, It includes a second cavity (6) and a third cavity (9). An primary reactor (5) is installed inside the second cavity (6). The input end of the primary reactor (5) is connected in parallel with a first conduit (4) and a fourth conduit (14). The output end of the primary reactor (5) is connected in parallel with a second conduit (8) and a third conduit (13). The output ends of the second conduit (8) and the third conduit (13) are both connected to the input end of the third cavity (9). On both sides inside the third cavity (9), a secondary reactor (11) is installed, and exhaust ports (10) are provided on both sides of the third cavity (9). A number of air holes (15) are provided at the tails of the second conduit (8) and the third conduit (13).

2. The exhaust gas treatment device according to claim 1, characterized in that, It further includes a first cavity (3). The output end of the first cavity (3) is connected to the input end of the first conduit (4) and the input end of the fourth conduit (14). A draft fan (1) is installed at the bottom of the first cavity (3). An air inlet (2) is provided at the output end of the draft fan (1). The draft fan (1) is connected to the first cavity (3) through the air inlet (2).

3. An exhaust gas treatment device according to claim 2, characterized in that, The first conduit (4) and the first cavity (3), the fourth conduit (14) and the first cavity (3), the first conduit (4) and the second cavity (6), and the fourth conduit (14) and the second cavity (6) are all connected through a first flange (12).

4. An exhaust gas treatment device according to claim 3, characterized in that, The second conduit (8) and the second cavity (6), and the third conduit (13) and the second cavity (6) are all connected through a second flange (16).

5. An exhaust gas treatment device according to claim 1, characterized in that, At the connection between the first conduit (4) and the primary reactor (5) and at the connection between the fourth conduit (14) and the primary reactor (5), a flow guide cover (17) is installed. The flow guide cover (17) is composed of a plurality of hollow frustum-shaped flow guide plates with different sizes, and the plurality of flow guide plates are arranged from small to large according to the gas flow direction.

6. An exhaust gas treatment device according to claim 1, characterized in that, Dosers (7) are installed above both the second conduit (8) and the third conduit (13).

7. A tail gas treatment method, characterized in that, It includes steps: S100 The tail gas to be treated is pumped in by the draft fan (1) and is transported to the inside of the first cavity (3) through the air inlet (2). S200 The tail gas in the first cavity (3) is respectively transported to the primary reactor (5) through the first conduit (4) and the fourth conduit (14) for primary purification treatment. S300 The tail gas treated by the primary reactor (5) is respectively transported to the inside of the third cavity (9) through the second conduit (8) and the third conduit (13). S400 The tail gas entering the third cavity (9) is input to both sides into the secondary reactor (11). After being treated by the secondary reactor (11), it is discharged through the exhaust ports (10) provided on both sides of the third cavity (9).

8. A tail gas treatment method according to claim 7, characterized in that, In the above-mentioned S200, the specific steps for the tail gas in the first cavity (3) to be respectively transported to the primary reactor (5) through the first conduit (4) and the fourth conduit (14) for primary purification treatment include: S210 The tail gas in the first conduit (4) and the fourth conduit (14) is guided into the primary reactor (5) through the flow guide cover (17).

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