A flue gas mixing and reaction device

Abstract

The present application provides a flue gas mixing and reaction device, comprising: a flue, with an inlet for the entry of flue gas provided at one end and a denitration catalyst reactor provided at the other end; a reagent injection assembly, located outside the flue and communicated with the flue through an injection pipeline, and the communication position is relatively close to the flue inlet, for injecting reaction reagents into the flue; a mixing and reaction assembly, located between the reagent injection assembly and the denitration catalyst reactor; comprising a housing and a plurality of guide plates, the housing is connected to the flue and the interior of the housing is communicated with the flue, and the guide plates are fixed on the inner wall of the housing. Ensure that the reaction reagents fully react with the flue gas pollutants, so as to improve the desulfurization and denitration reaction efficiency and reduce the escape rate of desulfurization and denitration reagents.

Description

Technical Field

[0001] This application belongs to the technical field of desulfurization and denitration, and particularly relates to a flue gas mixing reaction device. Background Art

[0002] The flue gas discharged from the kiln needs to be treated by desulfurization and denitration environmental protection facilities. NOx and SO2 in the flue gas pollutant emissions are an important indicator. Generally, the treatment measures for NOx and SO2 are to produce pollution-free substances through chemical reactions.

[0003] The main reactions of the denitration system are as follows:

[0004] 4NO + 4NH3 + O2 → 4N2 + 6H2O

[0005] NO + NO2 + 2NH3 → 2N2 + 3H2O

[0006] The main reactions of the desulfurization system are as follows:

[0007] Ca(OH)2 + SO2 = CaSO3·1 / 2 H2O + 1 / 2H2O

[0008] Ca(OH)2 + SO3 = CaSO4·1 / 2H2O + 1 / 2H2O

[0009] Before the flue gas from the kiln enters the denitration and desulfurization reactors, it is necessary to inject the denitration agent or desulfurization agent into the flue gas and mix it with the flue gas, and then react through a catalyst. Since the reaction reagent cannot be normally mixed evenly with the flue gas pollutants, the reaction effect in the reactor is not ideal, and the escape rate of the desulfurization and denitration reagents is relatively high. Only after being mixed evenly with the flue gas can an ideal state be achieved.

[0010] The prior art generally dilutes the reaction reagent through a spray gun and a dilution fan and re-incorporates it into the flue gas for reaction. However, the problem of uneven mixing during the desulfurization and denitration processes cannot be completely solved. Moreover, more air leaks in, affecting the flue gas volume and draft, and the escape rate of the desulfurization and denitration reagents is relatively high.

[0011] Therefore, there is an urgent need for a mixing reaction device to fully mix the reaction reagent with the flue gas and ensure the desulfurization and denitration effects.

[0012] Application Content

[0013] In view of the above defects or deficiencies in the prior art, this application aims to provide a flue gas mixing reaction device.

[0014] To achieve the above object, the embodiments of this application adopt the following technical solutions:

[0015] A flue gas mixing and reaction device includes: a flue, with an inlet for flue gas to enter at one end and a denitration catalyst reactor at the other end; a reagent injection assembly, located outside the flue and connected to the flue through an injection pipeline, and the connection point is relatively close to the flue inlet for injecting reaction reagents into the flue; a mixing and reaction assembly, located between the reagent injection assembly and the denitration catalyst reactor; including a housing and several guide plates, the housing is connected to the flue and the interior of the housing is communicated with the flue, and the guide plates are fixed on the inner wall of the housing.

[0016] According to the technical solution provided by the embodiment of the present application, one end of the guide plate is fixed on the inner wall of the housing, and the other end extends into the inner space of the housing; the guide plates are randomly distributed on the housing.

[0017] According to the technical solution provided by the embodiment of the present application, the cross-section of the guide plate relatively close to the flue center is smaller than the cross-section relatively far from the flue center.

[0018] According to the technical solution provided by the embodiment of the present application, the injection pipeline has multiple paths, and an injection valve is provided on each injection pipeline.

[0019] According to the technical solution provided by the embodiment of the present application, the injection pipeline has two paths and is distributed on both sides of the flue with the axis of the flue as the axis of symmetry; two reflector plates are arranged on the inner wall of the flue relatively close to the inlet, and the reflector plates are symmetrically arranged with the axis of the flue as the axis of symmetry; the injection pipeline forms an angle of 30-60 degrees with the flue, and the injection pipeline forms an angle of 30-60 degrees with the reflector plate.

[0020] According to the technical solution provided by the embodiment of the present application, a flue gas mixing assembly is further provided between the mixing and reaction assembly and the reagent injection assembly, the flue gas mixing assembly is communicated with the flue, and the flue gas mixing assembly includes: a first gas path and a second gas path for splitting the mixed flue gas; a mixer, which is provided with a first inlet communicated with the first gas path, a second inlet communicated with the second gas path, and an outlet for the mixed flue gas to flow out, for mixing the flue gas again sufficiently.

[0021] According to the technical solution provided by the embodiment of the present application, a first rotating plate is provided near the first inlet inside the mixer, and a second rotating plate is provided near the second inlet.

[0022] According to the technical solution provided by the embodiment of the present application, the first inlet is strip-shaped and corresponds to the position of the first rotating plate; the second inlet is strip-shaped and corresponds to the position of the second rotating plate.

[0023] The present application has the following beneficial effects:

[0024] Existing desulfurization agents or denitration reagents are directly injected into the flue gas pollutants and then enter the reaction device. Due to uneven mixing, the flue gas and the reaction reagents entering the reaction device cannot react sufficiently. The part with more reagents escapes, while the part of the flue gas with less reagents cannot react, resulting in low desulfurization and denitration efficiency. After adding a flue gas mixing component, the reagents injected into the flue gas and the flue gas need to pass through the flue gas mixing component before entering the reaction device, thereby thoroughly disrupting the flue gas and the desulfurization and denitration reaction reagents, mixing them evenly, and then reacting in the reaction device to ensure that the reaction reagents and the flue gas pollutants react sufficiently, so as to improve the desulfurization and denitration reaction efficiency and reduce the escape rate of desulfurization and denitration reagents. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0026] Figure 1 Structural schematic diagram of the device according to the embodiment of the present application;

[0027] Figure 2 Side view structural schematic diagram of the mixing reaction component according to the embodiment of the present application;

[0028] Figure 3 Structural schematic diagram of the reflector according to the embodiment of the present application;

[0029] Figure 4 Structural schematic diagram of the flue gas mixing component according to the embodiment of the present application;

[0030] Figure 5 Structural schematic diagram of the mixer according to the embodiment of the present application;

[0031] Figure 6 Cross-sectional structural schematic diagram of the mixer according to the embodiment of the present application.

[0032] Description of the reference numerals:

[0033] 100, flue; 200, inlet; 300, denitration catalyst reactor; 400, reagent injection component; 500, mixing reaction component; 600, flue gas mixing component;

[0034] 401, injection pipeline; 402, injection valve; 403, reflector;

[0035] 501, housing; 502, deflector;

[0036] 610, first gas path; 620, second gas path; 630, mixer;

[0037] 601, baffle block;

[0038] 631, First inlet; 632, Second inlet; 633, Gas path outlet; 634, First rotating plate; 635, Second rotating plate. Detailed implementation

[0039] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, rather than limiting the application. In addition, it should be noted that for the convenience of description, only the parts related to the application are shown in the drawings.

[0040] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0041] A flue gas mixing and reaction device includes: a flue 100, one end of which is provided with an inlet 200 for flue gas to enter, and the other end is provided with a denitration catalyst reactor 300; a reagent injection assembly 400, located outside the flue 100 and connected to the flue 100 through an injection pipeline 401, and the connection is relatively close to the inlet 200 of the flue 100 for injecting reaction reagents into the flue 100; a mixing and reaction assembly 500, located between the reagent injection assembly 400 and the denitration catalyst reactor 300; including a housing 501 and a plurality of guide plates 502, the housing 501 is connected to the flue 100 and the inside of the housing 501 is communicated with the flue 100, and the guide plates 502 are fixed on the inner wall of the housing 501.

[0042] Please refer specifically to Figure 1 As shown, since the flue gas mixing and reaction device described in the present application is provided with a mixing and reaction assembly 500 between the reagent injection assembly 400 and the denitration catalyst reactor 300, the reaction reagents injected by the injection pipeline 401 are fully mixed with the flue gas entering from the inlet 200 again and evenly, continuously ensuring that the reaction reagents fully react with the pollutants in the flue gas, and effectively reducing the escape rate of desulfurization and denitration reagents.

[0043] The flue gas enters the flue 100 from the inlet 200. The desulfurization reaction reagent is generally hydrogen peroxide or soda ash, and the denitration reaction reagent is generally ammonia. The denitration catalyst reactor 300 is generally a filter mesh structure equipped with a denitration catalyst to further ensure the denitration effect.

[0044] Furthermore, one end of the guide plate 502 is fixed on the inner wall of the housing 501, and the other end extends into the inner space of the housing 501; the guide plates 502 are randomly distributed on the housing 501.

[0045] Please refer specifically to Figure 1As shown, the flow deflector 502 is used to disrupt and fully mix the reaction reagent and flue gas inside the housing 501, enabling the two to react fully. The flow deflector 502 can be evenly distributed or unevenly distributed on the housing 501, and the mixing effect is better when it is unevenly distributed.

[0046] Furthermore, the cross-section of the flow deflector 502 relatively closer to the center of the flue 100 is smaller than the cross-section relatively farther from the center of the flue.

[0047] Please refer specifically to Figure 2 As shown, the flow deflector 502 deflects the reaction reagent and flue gas towards the center of the flue 100, enabling the two to be fully mixed.

[0048] In a specific embodiment of the present application, the cross-sectional shape of the flow deflector 502 is fan-shaped, and its arc portion is connected to the inner wall of the housing 501.

[0049] Furthermore, the injection pipeline 401 has multiple paths, and an injection valve 402 is provided on each injection pipeline 401.

[0050] Please refer specifically to Figure 1 As shown, the multiple injection pipelines 401 can hold the same or different reaction reagents, and the design of the injection valves 402 facilitates the selection of the corresponding reaction reagents and the control of their start and stop.

[0051] Furthermore, the injection pipeline 401 has two paths and is distributed on both sides of the flue 100 with the axis of the flue 100 as the axis of symmetry; two reflector plates 403 are provided on the inner wall of the flue 100 relatively closer to the inlet 200, and the reflector plates 403 are symmetrically arranged with the axis of the flue 100 as the axis of symmetry; the injection pipeline 401 forms an angle of 30 - 60 degrees with the flue 100, and the injection pipeline 401 forms an angle of 30 - 60 degrees with the reflector plate 403.

[0052] Please refer specifically to Figure 3 As shown, the reflector plate 403 is used to reflect the reagent injected by the injection pipeline 401 to the center of the flue 100, so that the reaction reagent can directly and fully react with the flue gas entering from the inlet 200 of the flue 100, improving the desulfurization and denitrification reaction efficiency.

[0053] Furthermore, a flue gas mixing assembly 600 is further provided between the mixing reaction assembly 500 and the reagent injection assembly 400. The flue gas mixing assembly 600 is communicated with the flue 100. The flue gas mixing assembly 600 includes: a first gas path 610 and a second gas path 620 for splitting the mixed flue gas; a mixer 630, which is provided with a first inlet 631 communicated with the first gas path 610, a second inlet 632 communicated with the second gas path 620, and a gas path outlet 633 for the outflow of the mixed flue gas, for mixing the flue gas again fully.

[0054] Specifically, the first gas path 610 and the second gas path 620 split the mixed flue gas, and then enter the mixer again through the first inlet 631 and the second inlet 632 respectively. After fully reacting, the gas flows out from the outlet 633 and enters the next process.

[0055] Please refer specifically to Figure 4 As shown, in a specific embodiment of the present application, the mixer 630 is fixed on the flue gas mixing assembly 600. The left side of the flue gas mixing assembly 600 is connected to the flue 100, and the right side is connected to the right flue through the outlet 633. Please refer to Figure 5 As shown, a device is provided to split the mixed flue gas, or directly two pipelines are provided to split the mixed flue gas. The split flue gas enters the interior of the mixer 630 through the first inlet 631 and the second inlet 632 respectively, and after being fully mixed again, it enters the next flue through the outlet 633.

[0056] Specifically, the baffle 601 is located at the center of the flue gas mixing assembly 600, relatively close to the inlet 200, and splits the flue gas to the space between the inner wall of the flue gas mixing assembly 600 and the baffle 601; the mixer 630 is located at the center of the flue gas mixing assembly 600, relatively far from the inlet 200, and is fixedly connected to the baffle 601. Of course, the mixed flue gas can also be split in other forms.

[0057] It should be noted that, please refer to Figure 5 As shown, the first inlet 631, the second inlet 632, and the outlet 633 are all long and narrow openings. When the mixed gas enters the mixer through the long and narrow openings, it has a certain pressure and further repeats the mixing reaction.

[0058] Furthermore, a first rotating plate 634 is provided inside the mixer 630 near the first inlet 631, and a second rotating plate 635 is provided near the second inlet 632.

[0059] Please refer specifically to Figure 6 As shown, the first rotating plate 634 and the second rotating plate rotate around a rotating shaft. Both ends of the rotating shaft span across two inner walls of the mixer 630, and the axial direction of the rotating shaft is the same as the axial direction of the flue 100. When the mixed gas enters the mixer 630 through the long and narrow inlet, it will push the corresponding first rotating plate 634 or the second rotating plate 635 to rotate, so that the mixed flue gas is fully and evenly mixed in the mixer 630.

[0060] Furthermore, the first inlet 631 is long and strip-shaped, corresponding to the position of the first rotating plate 634; the second inlet 632 is long and strip-shaped, corresponding to the position of the second rotating plate 635.

[0061] Please refer specifically to Figure 6As shown, the elongated first inlet 631 and second inlet 632 provide the driving force for the rotation of the first rotating plate 634 and the second rotating plate 635. The mixed flue gas entering from the first inlet 631 pushes the first rotating plate 634 to rotate, and the mixed flue gas entering from the second inlet 632 pushes the second rotating plate 635 to rotate, so that the mixed flue gas is fully and evenly mixed in the mixer 630 and enters the next reaction process through the first outlet 633, ensuring the desulfurization and denitrification effect.

[0062] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the application concept. For example, the technical solution formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. A flue gas mixing reaction device, characterized in that Comprising: A flue (100) with an inlet (200) for flue gas to enter at one end and a denitration catalyst reactor (300) at the other end; A reagent injection assembly (400), located outside the flue (100), connected to the flue (100) through an injection pipeline (401), and the connection point is relatively close to the inlet (200) of the flue (100), for injecting reaction reagents into the interior of the flue (100); The injection pipeline (401) has two paths and is distributed on both sides of the flue (100) with the axis of the flue (100) as the axis of symmetry; two reflecting plates (403) are arranged on the inner wall of the flue (100) relatively close to the inlet (200), and the reflecting plates (403) are symmetrically arranged with the axis of the flue (100) as the axis of symmetry; the injection pipeline (401) forms an angle of 30 - 60 degrees with the flue (100), and the injection pipeline (401) forms an angle of 30 - 60 degrees with the reflecting plate (403); A mixing and reaction assembly (500), located between the reagent injection assembly (400) and the denitration catalyst reactor (300); including a housing (501) and a number of guide vanes (502), the housing (501) is connected to the flue (100) and the interior of the housing (501) is communicated with the flue (100), and the guide vanes (502) are fixed on the inner wall of the housing (501); The guide vanes (502) are unevenly distributed in the housing (501), and the cross-sectional shape of the guide vanes (502) is fan-shaped, and its arc part is connected to the inner wall of the housing (501); A flue gas mixing assembly (600) is further provided between the mixing and reaction assembly (500) and the reagent injection assembly (400), the flue gas mixing assembly (600) is communicated with the flue (100), and the flue gas mixing assembly (600) includes: A first gas path (610) and a second gas path (620) for splitting the mixed flue gas; A mixer (630) with a first inlet (631) communicated with the first gas path (610), a second inlet (632) communicated with the second gas path (620), and a gas path outlet (633) for the outflow of the mixed flue gas, for mixing the flue gas again sufficiently; A baffle block (601) fixedly connected to the mixer (630), for splitting the mixed flue gas; A first rotating plate (634) is arranged near the first inlet (631) inside the mixer (630), and a second rotating plate (635) is arranged near the second inlet (632); The first inlet (631) is strip-shaped and corresponds to the position of the first rotating plate (634); the second inlet (632) is strip-shaped and corresponds to the position of the second rotating plate (635).

2. The flue gas mixing reaction device according to claim 1, characterized in that, One end of the guide vane (502) is fixed on the inner wall of the housing (501), and the other end extends into the inner space of the housing (501); the guide vanes (502) are randomly distributed on the housing (501).

3. A flue gas mixing reaction device according to claim 1, characterized in that, The cross-section of the guide vane (502) relatively close to the center of the flue (100) is smaller than the cross-section relatively far from the center of the flue.

4. A flue gas mixing and reaction device according to claim 1, characterized in that, The injection pipeline (401) has multiple paths, and an injection valve (402) is provided on each injection pipeline (401).

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