Low-temperature catalytic cracking flue gas denitration device

Abstract

The utility model provides a low-temperature catalytic cracking flue gas denitration device, belongs to the technical field of flue gas denitration treatment, and aims to solve the problems that the mixing of the existing flue gas and ammonia gas mainly depends on the natural flowing of the flue gas, the flue gas is difficult to disperse quickly and the denitration efficiency is influenced by the passive mixing mode when the flow fluctuation of the flue gas is larger. Comprising a reactor main body, a fixed shell, a driving motor, a uniform mixing assembly and a dispersing assembly, the fixed shell is fixedly connected to the left side of the reactor main body; the driving motor is fixedly connected to the left side of the fixed shell; the uniform mixing assembly is arranged in the mixing chamber; and the dispersing assembly is arranged in the mixing chamber. According to the utility model, the first mixing blade and the second mixing blade which rotate in opposite directions are arranged, a complex turbulent flow field is formed in the mixing chamber, and the dispersing blades are matched, so that the mixing effect of flue gas and ammonia gas is greatly improved, the denitration efficiency is guaranteed, and the ammonia escape phenomenon is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flue gas denitration processing technical field, more specifically, particularly relate to a low temperature catalytic cracking flue gas denitration device. BACKGROUND

[0002] Low temperature catalytic cracking flue gas denitration is a kind of technology using catalyst at lower temperature to reduce nitrogen oxides (NOx) in flue gas into nitrogen (N2) and water (H2O), this technology is mainly used for industrial flue gas treatment, especially coal-fired power plant, steel plant, cement plant and so on discharge a large amount of NOx industry, the existing low temperature catalytic cracking flue gas denitration equipment is generally by flue gas ammonia gas mixing chamber, ammonia injection grid, static mixer, guide vane and the reactor installed with catalyst layer.

[0003] The utility model discloses a flue gas denitration device, the opening of ammonia injection pipe is divided into first opening and second opening, the aperture of first opening is greater than second opening, realizes the uniform distribution of ammonia gas in flue gas, makes ammonia gas and flue gas mix evenly, in addition, the elbow place of import flue is provided with guide vane, makes the airflow distribution of flue gas even, and the comprehensive effect improves the denitration efficiency of flue gas in denitration device, and furthermore, scientifically increase the opening number of ammonia injection pipe, improve the flow area of dilution air pipe, make the pressure loss of ammonia injection pipeline small, ensure the safe operation of entire denitration system.

[0004] Based on the above, the mixing of flue gas and ammonia gas mainly depends on the natural flow of flue gas, when flue gas passes through ammonia injection grid, the sprayed ammonia gas and flue gas are primarily mixed, then the gas residence time is prolonged by the static mixer at the rear end, further promote mixing, however, this passive mixing mode lacks active turbulent flow strengthening mechanism when flue gas flow fluctuates greatly, ammonia gas is easy to form aggregation area in flue after spraying, difficult to disperse quickly, and local ammonia gas concentration is too high not only can increase the risk of ammonia escape, but also can lead to the generation of ammonia salt deposits on the surface of catalyst layer, block catalyst pore, and then reduce the activity and denitration efficiency of catalyst. UTILITY MODEL CONTENTS

[0005] In order to solve the above technical problems, the utility model provides a low temperature catalytic cracking flue gas denitration device to solve the mixing of the existing flue gas and ammonia mainly depends on the natural flow of flue gas, when the flue gas passes through ammonia injection grid, the sprayed ammonia and flue gas are preliminarily mixed, then the static mixer at the rear end is passed through and the gas residence time is prolonged, and the mixing is further promoted, however, this passive mixing mode lacks active turbulent flow strengthening mechanism when the flue gas flow fluctuates greatly, the sprayed ammonia is easy to form an aggregation area in the flue, and it is difficult to disperse quickly, and the local ammonia concentration is too high, which not only increases the risk of ammonia escape, but also can cause the generation of ammonia salt deposits on the surface of the catalyst layer, blocks the catalyst pores, and further reduces the activity and denitration efficiency of the catalyst.

[0006] The purpose and function of the low temperature catalytic cracking flue gas denitration device are achieved by the following specific technical means:

[0007] A low temperature catalytic cracking flue gas denitration device, comprising a reactor main body, a mixing chamber, a smoke inlet, an ammonia inlet, an ammonia injection grid, a fixed shell, a drive motor, a fixed box, a uniform mixing assembly and a dispersion assembly; the mixing chamber is fixedly connected to the left side of the reactor main body; the smoke inlet is fixedly connected to the left side of the mixing chamber; the ammonia inlet is fixedly connected to the left side of the mixing chamber; the ammonia injection grid is fixedly connected to the inside of the mixing chamber; the fixed shell is fixedly connected to the left side of the reactor main body; the drive motor is fixedly connected to the left side of the fixed shell; the fixed box is fixedly connected to the inside of the mixing chamber; the uniform mixing assembly is arranged in the inside of the mixing chamber; and the dispersion assembly is arranged in the inside of the mixing chamber.

[0008] Further, the uniform mixing assembly comprises a first connecting shaft and a first drive bevel gear; the first connecting shaft is coaxially fixedly connected to the right end of the rotating shaft of the drive motor; and the first drive bevel gear is coaxially fixedly connected to the right end of the first connecting shaft.

[0009] Further, the uniform mixing assembly further comprises a first connecting rotating shaft, a first mixing bevel gear and a first mixing blade; the first connecting rotating shaft is rotatably connected to the top of the fixed box; the first mixing bevel gear is coaxially fixedly connected to the top of the first connecting rotating shaft, and the first mixing bevel gear is engaged with the first drive bevel gear; and the first mixing blade is coaxially fixedly connected to the bottom outside of the first connecting rotating shaft.

[0010] Further, the uniform mixing assembly further comprises a second connecting rotating shaft, a second mixing bevel gear and a second mixing blade; the second connecting rotating shaft is rotatably connected to the bottom of the fixed box; the second mixing bevel gear is coaxially fixedly connected to the top of the second connecting rotating shaft, and the second mixing bevel gear is engaged with the first drive bevel gear; and the second mixing blade is coaxially fixedly connected to the outside of the second connecting rotating shaft.

[0011] Further, the dispersion assembly comprises a dispersion shaft, dispersion pulleys and a dispersion transmission belt; the dispersion shaft is rotationally connected inside the fixed shell and the mixing chamber; the dispersion pulleys are provided in two pieces, and the two dispersion pulleys are coaxially fixedly connected to the dispersion shaft and the left end of the first connecting shaft respectively; and the dispersion transmission belt is transmissionally connected outside the two dispersion pulleys.

[0012] Further, the dispersion assembly further comprises dispersion blades; the dispersion blades are provided on the left side of the ammonia injection grid, and the dispersion blades are coaxially fixedly connected to the right end of the dispersion shaft.

[0013] Compared with the prior art, the utility model has the advantages of the following beneficial effects:

[0014] Firstly, when the flue gas passes through the ammonia injection grid, the flue gas is mixed with the ammonia gas injected by the ammonia injection grid, and in the process of continuing to move upward, the driving motor drives the first mixing blade and the second mixing blade to rotate in opposite directions through the uniform mixing assembly, so that stronger shear force is generated, the mixing of the ammonia gas and the flue gas is promoted, the mixing efficiency is significantly improved, and through more uniform mixing, the problem of ammonia escape caused by too high local ammonia concentration can be reduced.

[0015] Secondly, a rotating dispersion blade is arranged at each nozzle of the ammonia injection grid, the rotating dispersion blade can disperse the injected ammonia gas into smaller air groups, avoid the ammonia gas from gathering in a local area, and the ammonia gas can be more uniformly distributed into the mixing chamber, so that the mixing speed of the ammonia gas and the flue gas is accelerated.

[0016] In the flue gas denitration process, the first mixing blade and the second mixing blade are arranged to rotate in opposite directions, stronger shear force is generated, and a complex turbulent flow field is formed in the mixing chamber; the dispersion blade rotating at each nozzle of the ammonia injection grid disperses the ammonia gas into small air groups, prevents local gathering, greatly improves the mixing effect of the flue gas and the ammonia gas, guarantees the denitration efficiency, and reduces the occurrence of ammonia escape. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole structure schematic view of the utility model.

[0018] Figure 2 It is an ammonia injection grid structure schematic view of the utility model.

[0019] Figure 3 It is a first connecting shaft structure schematic view of the utility model.

[0020] Figure 4 It is a second connecting shaft structure schematic view of the utility model.

[0021] Figure 5 It is a dispersion blade structure schematic view of the utility model.

[0022] In the figure, the correspondence between the component names and the figure numbers is:

[0023] 1, reactor main body; 2, mixing chamber; 3, smoke inlet; 4, ammonia gas inlet; 5, ammonia injection grid; 6, fixed shell; 7, drive motor; 8, fixed box; 9, first connecting shaft; 901, first drive bevel gear; 10, first connecting rotating shaft; 1001, first mixing bevel gear; 1002, first mixing blade; 11, second connecting rotating shaft; 1101, second mixing bevel gear; 1102, second mixing blade; 12, dispersion shaft; 13, dispersion pulley; 14, dispersion transmission belt; 15, dispersion blade. DETAILED DESCRIPTION

[0024] The embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0025] Example one: as shown in the accompanying Figure 1 to the accompanying Figure 5 :

[0026] The utility model provides a kind of low-temperature catalytic cracking flue gas denitration device, including reactor main body 1, mixing chamber 2, smoke inlet 3, ammonia gas inlet 4, ammonia injection grid 5, fixed shell 6, drive motor 7, fixed box 8 and uniform mixing component;Mixing chamber 2 is fixedly connected at the left side of reactor main body 1;Smoke inlet 3 is fixedly connected at the left side of mixing chamber 2;Ammonia gas inlet 4 is fixedly connected at the left side of mixing chamber 2;Ammonia injection grid 5 is fixedly connected in mixing chamber 2 interior;Fixed shell 6 is fixedly connected at the left side of reactor main body 1;Drive motor 7 is fixedly connected at the left side of fixed shell 6;Fixed box 8 is fixedly connected in mixing chamber 2 interior;Uniform mixing component is arranged in mixing chamber 2 interior.

[0027] Among them, uniform mixing component includes: first connecting shaft 9 and first drive bevel gear 901;First connecting shaft 9 is coaxially fixedly connected at the right end of the rotating shaft of drive motor 7;First drive bevel gear 901 is coaxially fixedly connected at the right end of first connecting shaft 9.

[0028] Among them, uniform mixing component further includes: first connecting rotating shaft 10, first mixing bevel gear 1001 and first mixing blade 1002;First connecting rotating shaft 10 top is rotatably connected at the top of fixed box 8;First mixing bevel gear 1001 is coaxially fixedly connected at the top of first connecting rotating shaft 10, and first mixing bevel gear 1001 is engaged with first drive bevel gear 901;First mixing blade 1002 is coaxially fixedly connected at the bottom outside of first connecting rotating shaft 10.

[0029] The uniform mixing component further includes: a second connecting shaft 11, a second mixing bevel gear 1101, and a second mixing blade 1102; the top of the second connecting shaft 11 is rotatably connected to the bottom of the fixed box 8; the second mixing bevel gear 1101 is coaxially fixedly connected to the top of the second connecting shaft 11, and the second mixing bevel gear 1101 meshes with the first driving bevel gear 901; the second mixing blade 1102 is coaxially fixedly connected to the outside of the second connecting shaft 11.

[0030] The specific usage and function of this embodiment are as follows: During use, flue gas enters the mixing chamber 2 through the flue gas inlet 3, mixes with the ammonia gas sprayed out by the ammonia spraying grid 5, and continues to move upward. The drive motor 7 drives the first drive bevel gear 901 to rotate through the first connecting shaft 9. The first drive bevel gear 901 drives the first connecting shaft 10 and the second connecting shaft 11 to rotate simultaneously in opposite directions through the bevel gear transmission mechanism formed by meshing with the first mixing bevel gear 1001 and the second mixing bevel gear 1101, thereby driving the first mixing blade 1002 and the second mixing blade 1102 to rotate in opposite directions, thereby mixing the ammonia gas and flue gas more evenly and forming a more complex turbulent field in the mixing chamber 2, which significantly improves the mixing effect.

[0031] Example 2: Based on Example 1, as shown in the appendix Figure 1 To be continued Figure 5 As shown, it also includes a dispersion component, which is disposed inside the mixing chamber 2.

[0032] The dispersion assembly includes a dispersion shaft 12, a dispersion pulley 13, and a dispersion transmission belt 14. The dispersion shaft 12 is rotatably connected to the fixed shell 6 and the mixing chamber 2. Two dispersion pulleys 13 are provided, and the two dispersion pulleys 13 are coaxially fixedly connected to the left end of the dispersion shaft 12 and the first connecting shaft 9, respectively. The dispersion transmission belt 14 is drivenly connected to the outside of the two dispersion pulleys 13.

[0033] The dispersion component also includes: dispersion blades 15; the dispersion blades 15 are disposed on the left side of the ammonia injection grid 5, and the dispersion blades 15 are coaxially fixedly connected to the right end of the dispersion shaft 12.

[0034] The specific usage and function of this embodiment: When the drive motor 7 drives the first drive bevel gear 901 to rotate through the first connecting shaft 9, it will also drive the top dispersion pulley 13 to rotate. The top dispersion pulley 13, together with the dispersion transmission belt 14 and the bottom dispersion pulley 13, can drive the dispersion shaft 12 to rotate through the transmission mechanism. The rotation of the dispersion shaft 12 will drive the dispersion blades 15 arranged on the left side of the ammonia spraying grid 5 to rotate. The rotation of the dispersion blades 15 can disperse the ammonia gas sprayed from the ammonia spraying grid 5 in an instant, breaking the ammonia gas into smaller gas clouds and preventing the ammonia gas from accumulating in local areas.

[0035] Herein, the following points need to be noted:

[0036] 1. The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0037] 2. In the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0038] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A low-temperature catalytic cracking flue gas denitrification device, comprising a reactor body (1), a mixing chamber (2), a flue gas inlet (3), an ammonia inlet (4), an ammonia injection grid (5), a fixed shell (6), a drive motor (7), a fixed box (8), a uniform mixing component, and a dispersion component; characterized in that: The mixing chamber (2) is fixedly connected to the left side of the reactor body (1); the flue gas inlet (3) is fixedly connected to the left side of the mixing chamber (2); the ammonia inlet (4) is fixedly connected to the left side of the mixing chamber (2); the ammonia spray grid (5) is fixedly connected to the inside of the mixing chamber (2); the fixed shell (6) is fixedly connected to the left side of the reactor body (1); the drive motor (7) is fixedly connected to the left side of the fixed shell (6); the fixed box (8) is fixedly connected to the inside of the mixing chamber (2); the uniform mixing component is set inside the mixing chamber (2); the dispersing component is set inside the mixing chamber (2).

2. The low-temperature catalytic cracking flue gas denitrification device as described in claim 1, characterized in that: The uniform mixing component includes: a first connecting shaft (9) and a first driving bevel gear (901); the first connecting shaft (9) is coaxially fixedly connected to the right end of the shaft of the drive motor (7); the first driving bevel gear (901) is coaxially fixedly connected to the right end of the first connecting shaft (9).

3. The low-temperature catalytic cracking flue gas denitrification device as described in claim 2, characterized in that: The uniform mixing assembly further includes: a first connecting shaft (10), a first mixing bevel gear (1001), and a first mixing blade (1002); the top of the first connecting shaft (10) is rotatably connected to the top of the fixed box (8); the first mixing bevel gear (1001) is coaxially fixedly connected to the top of the first connecting shaft (10), and the first mixing bevel gear (1001) meshes with the first driving bevel gear (901); the first mixing blade (1002) is coaxially fixedly connected to the outer side of the bottom of the first connecting shaft (10).

4. The low-temperature catalytic cracking flue gas denitrification device as described in claim 2, characterized in that: The uniform mixing assembly further includes: a second connecting shaft (11), a second mixing bevel gear (1101), and a second mixing blade (1102); the top of the second connecting shaft (11) is rotatably connected to the bottom of the fixed box (8); the second mixing bevel gear (1101) is coaxially fixedly connected to the top of the second connecting shaft (11), and the second mixing bevel gear (1101) meshes with the first driving bevel gear (901); the second mixing blade (1102) is coaxially fixedly connected to the outside of the second connecting shaft (11).

5. The low-temperature catalytic cracking flue gas denitrification device as described in claim 1, characterized in that: The dispersion assembly includes: a dispersion shaft (12), dispersion pulleys (13), and a dispersion transmission belt (14); the dispersion shaft (12) is rotatably connected to the fixed shell (6) and the mixing chamber (2); two dispersion pulleys (13) are provided, and the two dispersion pulleys (13) are coaxially fixedly connected to the left end of the dispersion shaft (12) and the first connecting shaft (9); the dispersion transmission belt (14) is driven connected to the outside of the two dispersion pulleys (13).

6. The low-temperature catalytic cracking flue gas denitrification device as described in claim 5, characterized in that: The dispersion assembly also includes: dispersion blades (15); the dispersion blades (15) are disposed on the left side of the ammonia spray grid (5), and the dispersion blades (15) are coaxially fixedly connected to the right end of the dispersion shaft (12).

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