Waste gas treatment device for flue gas denitration

Abstract

The utility model relates to the field of waste gas treatment equipment, and discloses a waste gas treatment device for flue gas denitration, which comprises a cavity, a dust removal chamber and a denitration chamber, a gas inlet is formed in the lower part of the cavity, and a gas outlet is formed in the upper part of the cavity; the lower part of the dust removal chamber is communicated with the air inlet, and the filter screen can filter solid dust in flue gas; the upper part of the denitration chamber is communicated with the gas outlet and can absorb nitrogen oxides in the flue gas; the denitration chamber comprises a plurality of atomizing nozzles arranged on the inner wall of the cavity, and each atomizing nozzle is connected with an external denitration agent liquid pipeline; and each atomizing nozzle at least comprises another atomizing nozzle which is arranged opposite to the atomizing nozzle. An atomized denitration agent is sprayed into the cavity through the atomizing nozzles, so that the cavity is filled with rich denitration agent liquid drops, the spraying directions of the oppositely arranged atomizing nozzles are crossed, the denitration agent liquid drops are impacted and crushed into liquid drops with smaller sizes, the denitration agent liquid drops are in full contact with flue gas, the contact surface area of reaction is increased, the reaction speed is increased, and the denitration effect is improved. And the reaction is more thorough.

Description

Technical Field

[0001] The utility model relates to the field of waste gas treatment equipment, in particular to a waste gas treatment device for flue gas denitration. Background Art

[0002] Waste gas refers to toxic and harmful gases discharged during production and life. In particular, waste gas discharged from chemical plants, steel plants, pharmaceutical plants, coking plants, and oil refineries has a strong odor, seriously polluting the environment and affecting human health.

[0003] The existing waste gas treatment equipment passes the flue gas through a container filled with denitrification liquid. During the contact with the denitrification agent, the nitrogen oxides are reduced to nitrate ions, dissolved in the liquid and discharged. However, the flue gas continues to rise in the liquid and has a short residence time. The contact time between the flue gas and the denitrification agent is short and the contact area is small, resulting in a reaction speed that is too slow and insufficient. A small amount of toxic gas may still exist after the gas passes through the reaction liquid, and the denitrification effect is poor. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a waste gas treatment device for flue gas denitrification, which is used to solve the problems of slow denitrification speed and incomplete denitrification of the existing waste gas treatment equipment.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides an exhaust gas treatment device for flue gas denitrification, including a cavity, a dust removal chamber, and a denitrification chamber:

[0006] The cavity is cylindrical, with an air inlet at the bottom and an air outlet at the top, forming a channel inside the cavity for smoke to pass from bottom to top;

[0007] The dust removal chamber is arranged at the lower part of the cavity, the lower part of the dust removal chamber is communicated with the air inlet, and the dust removal chamber has a replaceable filter screen capable of filtering solid dust in the smoke;

[0008] The denitrification chamber is arranged at the upper part of the cavity and isolated from the dust removal chamber by a partition, and the upper part of the denitrification chamber is connected to the gas outlet, and can absorb nitrogen oxides in the flue gas;

[0009] A connecting air pipe is provided between the denitration chamber and the dust removal chamber, the connecting air pipe is located outside the cavity and two ends of the connecting air pipe are respectively connected to the lower part of the side wall of the denitration chamber and the upper part of the side wall of the dust removal chamber;

[0010] The denitrification chamber includes a plurality of atomizing nozzles arranged on the inner wall of the cavity, each atomizing nozzle is connected to an external denitrification liquid pipeline to spray atomized denitrification agent into the cavity;

[0011] Each of the atomizing nozzles has at least one other atomizing nozzle arranged opposite to it, so that the droplets sprayed by the opposite atomizing nozzles collide and break into droplets of smaller size.

[0012] By adopting the above technical scheme, the flue gas first passes through the dust removal chamber, and the filter screen filters out the solid dust in the flue gas, thereby realizing the pretreatment of the flue gas; the flue gas after dust removal then enters the denitrification chamber through the connecting air pipe, and the atomizing nozzle sprays the atomized denitrification agent into the cavity, so that the cavity is filled with abundant small droplets of the denitrification agent, and the small droplets of the denitrification agent are fully in contact with the flue gas, thereby increasing the contact surface area between the two reactants, improving the reaction speed, and making the reaction more thorough; and, the spraying directions of the relatively arranged atomizing nozzles are crossed, so that the small droplets of the denitrification agent collide with each other and break into droplets of smaller size, thereby further increasing the contact surface area between the two reactants on the basis of atomization, and further improving the reaction speed and the thoroughness of the reaction.

[0013] In one embodiment of the present application, the atomizing nozzles are symmetrically arranged relative to the center line of the cavity and are evenly arranged from bottom to top along the height direction.

[0014] By adopting the above technical solution, the atomized denitrification agent filled in the cavity is made more uniform, further improving the speed and thoroughness of the reaction.

[0015] In one embodiment of the present application, the liquid outlet direction of each atomizing nozzle is arranged along the horizontal direction.

[0016] By adopting the above technical solution, the liquid sprayed from the atomizing nozzle is sprayed toward the center of the cavity in a parabolic shape, and the liquid sprayed from the oppositely arranged atomizing nozzles can move to the center line of the cavity and collide with each other.

[0017] In one embodiment of the present application, the liquid discharge direction of each atomizing nozzle is arranged to be inclined downward or upward along the horizontal direction, and the atomizing nozzles adjacent to each other in the height direction are arranged in opposite inclination directions.

[0018] By adopting the above technical scheme, the liquid sprayed from the atomizing nozzle is sprayed obliquely downward or upward toward the center line of the cavity. On the one hand, the liquid sprayed from the relatively arranged atomizing nozzles can move to the center line of the cavity and collide with each other. On the other hand, the liquid sprayed from the adjacent atomizing nozzles in the height direction can also move to the center line of the cavity and collide with each other, thereby further increasing the collision frequency between the droplets, further reducing the size of the droplets, thereby further increasing the contact surface area between the two reactants, and improving the speed and thoroughness of the reaction.

[0019] In one embodiment of the present application, a liquid outlet is provided at the lower portion of the side wall of the denitrification chamber, and the liquid outlet is connected to an external waste liquid treatment device.

[0020] By adopting the above technical solution, the denitrification agent after the reaction flows out through the liquid outlet, and the reaction waste liquid is treated and recovered by the external waste liquid treatment equipment to prevent the reaction waste liquid from being directly discharged and causing pollution.

[0021] In one embodiment of the present application, the upper surface of the partition is inclined, and the liquid outlet is located at the lowest point of the inclination of the partition.

[0022] By adopting the above technical solution, since the partition is arranged inclined, all the liquid in the denitrification chamber can be retained along the inclination direction of the partition to the lowest point of the inclination of the partition, and then flow out through the liquid outlet.

[0023] In one embodiment of the present application, the air inlet is located at the lower part of the side wall of the cavity, the air outlet is located on the top surface of the cavity, and a grille plate is provided on the end surface of the air outlet.

[0024] By adopting the above technical solution, the flue gas to be treated enters the cavity through the air inlet, and the flue gas after denitrification treatment is discharged from the air outlet of the cavity; the grille plate on the end face of the air outlet can block foreign matter from entering the air outlet pipe to prevent the air outlet from being blocked.

[0025] In one embodiment of the present application, the side wall of the cavity is provided with a first connecting port and a second connecting port, the first connecting port is located at the lower side of the partition, the second connecting port is located at the upper side of the partition, and the two ends of the connecting air pipe are respectively connected to the first connecting port and the second connecting port.

[0026] By adopting the above technical solution, the flue gas after dust removal in the dust removal chamber can enter the denitrification chamber from the dust removal chamber, and the liquid in the denitrification chamber will not enter the dust removal chamber.

[0027] In one embodiment of the present application, the dust removal chamber includes at least two layers of filter screens arranged in sequence from bottom to top, each of the filter screens is disc-shaped, each of the filter screens is arranged parallel to each other, and each of the filter screens is located at the bottom of the lowest point of the first connecting port.

[0028] By adopting the above technical solution, the filter can filter the solid dust in the flue gas. After long-term use, the bottom of the dust removal chamber can be disassembled and the filter can be replaced, and filters of different mesh sizes can be replaced according to needs.

[0029] In one embodiment of the present application, an activated carbon adsorption layer is disposed on the top filter screen. The activated carbon adsorption layer is disc-shaped and disposed parallel to the filter screen. The activated carbon adsorption layer is located at the bottom of the lowest point of the first connecting port.

[0030] By adopting the above technical solution, the activated carbon adsorption layer can adsorb other harmful substances in the flue gas. After long-term use, the bottom of the dust removal chamber can be disassembled and the activated carbon adsorption layer can be disassembled and replaced.

[0031] As described above, the waste gas treatment device for flue gas denitrification of the utility model has the following beneficial effects:

[0032] 1. The solid dust in the flue gas is filtered out through the filter screen in the dust removal room, thus realizing the pretreatment of the flue gas;

[0033] 2. Spray the atomized denitrifier into the cavity through the atomizing nozzle, so that the cavity is filled with abundant small droplets of denitrifier. The small droplets of denitrifier are fully in contact with the flue gas, which increases the contact surface area between the two reactants, improves the reaction speed, and makes the reaction more thorough;

[0034] 3. The spray directions of the relatively arranged atomizing nozzles are crossed, so that the small droplets of the denitrifying agent collide with each other and break into droplets of smaller size, which further increases the contact surface area between the two reactants on the basis of atomization, and further improves the reaction speed and the thoroughness of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Shown is a cross-sectional schematic diagram of a waste gas treatment device for flue gas denitrification disclosed in Example 1 of the utility model.

[0036] Figure 2 Display as Figure 1 AA side cross-section diagram.

[0037] Figure 3 It shows a cross-sectional schematic diagram of a waste gas treatment device for flue gas denitrification disclosed in the second embodiment of the present utility model.

[0038] Description of Reference Numerals

[0039] 1. Cavity; 2. Dust removal chamber; 21. Filter; 22. Activated carbon adsorption layer; 3. Denitrification chamber; 31. Atomizing nozzle; 32. Liquid outlet; 4. Air inlet; 5. Air outlet; 51. Grid plate; 6. Partition; 7. Connecting air pipe; 71. First connecting port; 72. Second connecting port. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] Embodiment 1

[0045] See also Figure 1-2 The utility model provides a waste gas treatment device for flue gas denitration, comprising a cavity 1, a dust removal chamber 2, and a denitration chamber 3:

[0046] The cavity 1 is cylindrical, with an air inlet 4 at the lower part of the cavity 1 and an air outlet 5 at the upper part of the cavity 1, and a channel for smoke to pass from bottom to top is formed inside the cavity 1;

[0047] The dust removal chamber 2 is arranged at the lower part of the cavity 1, and the lower part of the dust removal chamber 2 is communicated with the air inlet 4. The dust removal chamber 2 has a replaceable filter screen 21 capable of filtering solid dust in the smoke;

[0048] The denitrification chamber 3 is arranged at the upper part of the cavity 1 and is isolated from the dust removal chamber 2 by a partition 6. The upper part of the denitrification chamber 3 is connected to the gas outlet 5, and can absorb nitrogen oxides in the flue gas;

[0049] A connecting air pipe 7 is provided between the denitration chamber 3 and the dust removal chamber 2. The connecting air pipe 7 is located outside the cavity 1 and the two ends of the connecting air pipe 7 are respectively connected to the lower part of the side wall of the denitration chamber 3 and the upper part of the side wall of the dust removal chamber 2;

[0050] The denitrification chamber 3 includes a plurality of atomizing nozzles 31 disposed on the inner wall of the cavity 1, and each atomizing nozzle 31 is connected to an external denitrification liquid pipeline to spray atomized denitrification agent into the cavity 1;

[0051] Each atomizing nozzle 31 is provided with at least one other atomizing nozzle 31 arranged opposite to it, so that the droplets sprayed from the opposite atomizing nozzles 31 collide and break into droplets of smaller size.

[0052] In this way, the flue gas first passes through the dust removal chamber 2, and the filter screen 21 filters out the solid dust in the flue gas, thereby realizing the pretreatment of the flue gas; the flue gas after dust removal then enters the denitrification chamber 3 through the connecting air pipe 7, and the atomizing nozzle 31 sprays the atomized denitrification agent into the cavity 1, so that the cavity 1 is filled with abundant small droplets of the denitrification agent, and the small droplets of the denitrification agent are fully in contact with the flue gas, thereby increasing the contact surface area between the two reactants, improving the reaction speed, and making the reaction more thorough; and, the spraying directions of the relatively arranged atomizing nozzles 31 are intersected, so that the small droplets of the denitrification agent collide with each other and break into droplets of smaller size, thereby further increasing the contact surface area between the two reactants on the basis of atomization, thereby further improving the reaction speed and the thoroughness of the reaction.

[0053] Specifically, the atomizing nozzles 31 are symmetrically arranged relative to the center line of the cavity 1 and are evenly arranged from bottom to top along the height direction.

[0054] In this way, the atomized denitrification agent filled in the cavity 1 is made more uniform, further improving the speed and thoroughness of the reaction.

[0055] More specifically, each atomizing nozzle 31 is arranged to discharge liquid in a horizontal direction.

[0056] In this way, the liquid sprayed from the atomizing nozzle 31 is sprayed toward the center of the cavity 1 in a parabolic shape, and the liquids sprayed from the atomizing nozzles 31 arranged opposite to each other can move to the center line of the cavity 1 and collide with each other.

[0057] In addition, a liquid outlet 32 ​​is provided at the lower part of the side wall of the denitrification chamber 3, and the liquid outlet 32 ​​is connected to an external waste liquid treatment device.

[0058] In this way, the denitrification agent after the reaction flows out through the liquid outlet 32, and the reaction waste liquid is treated and recovered by the external waste liquid treatment equipment to prevent the reaction waste liquid from being directly discharged and causing pollution.

[0059] It should be noted that the upper surface of the partition 6 is inclined, and the liquid outlet 32 ​​is located at the lowest point of the inclination of the partition 6 .

[0060] In this way, since the partition 6 is arranged at an inclination, the liquid in the denitration chamber 3 can all be retained along the inclination direction of the partition 6 to the lowest point of the inclination of the partition 6, and then flow out through the liquid outlet 32.

[0061] Specifically, the air inlet 4 is located at the lower part of the side wall of the cavity 1 , the air outlet 5 is located on the top surface of the cavity 1 , and a grid plate 51 is provided on the end surface of the air outlet 5 .

[0062] In this way, the flue gas to be treated enters the cavity 1 through the air inlet 4, and the flue gas after denitrification treatment is discharged from the air outlet 5 of the cavity 1; the grid plate 51 on the end face of the air outlet 5 can block foreign matter from entering the pipe of the air outlet 5 to prevent the air outlet 5 from being blocked.

[0063] More specifically, the side wall of the cavity 1 is provided with a first connecting port 71 and a second connecting port 72, the first connecting port 71 is located at the lower side of the partition 6, and the second connecting port 72 is located at the upper side of the partition 6, and the two ends of the connecting air pipe 7 are respectively connected to the first connecting port 71 and the second connecting port 72.

[0064] In this way, the flue gas after dust removal in the dust removal chamber 2 can enter the denitration chamber 3 from the dust removal chamber 2, and the liquid in the denitration chamber 3 will not enter the dust removal chamber 2.

[0065] In addition, the dust removal chamber 2 includes at least two layers of filter screens 21 arranged sequentially from bottom to top, each filter screen 21 is disc-shaped, and each filter screen 21 is arranged parallel to each other. Each filter screen 21 is located at the bottom of the lowest point of the first connecting port 71.

[0066] In this way, the filter 21 can filter the solid dust in the flue gas. After long-term use, the bottom of the dust removal chamber 2 can be disassembled to disassemble and replace the filter 21, and the filter 21 with different mesh sizes can be replaced according to needs.

[0067] It should be noted that an activated carbon adsorption layer 22 is disposed on the top filter screen 21 . The activated carbon adsorption layer 22 is disc-shaped and disposed parallel to the filter screen 21 . The activated carbon adsorption layer 22 is located at the bottom of the lowest point of the first connecting port 71 .

[0068] In this way, the activated carbon adsorption layer 22 can adsorb other harmful substances in the flue gas. After long-term use, the bottom of the dust removal chamber 2 can be disassembled and the activated carbon adsorption layer 22 can be disassembled and replaced.

[0069] In addition, the bottom of the cavity 1 adopts a detachable structure connected by bolts, which is convenient for removing and replacing the filter screen or the activated carbon adsorption layer.

[0070] Embodiment 2

[0071] See also Figure 3The difference between this embodiment and the first embodiment is that the liquid discharge direction of each atomizing nozzle 31 is arranged to be inclined downward or upward along the horizontal direction, and the atomizing nozzles 31 adjacent to each other in the height direction are arranged in opposite inclination directions.

[0072] In this way, the liquid sprayed from the atomizing nozzle 31 is sprayed obliquely downward or upward toward the center line of the cavity 1. On the one hand, the liquid sprayed from the relatively arranged atomizing nozzles 31 can move to the center line of the cavity 1 and collide with each other. On the other hand, the liquid sprayed from the adjacent atomizing nozzles 31 in the height direction can also move to the center line of the cavity 1 and collide with each other, which further increases the collision frequency between the droplets, further reduces the size of the droplets, thereby further increasing the contact surface area between the two reactants, and improving the speed and thoroughness of the reaction.

[0073] In summary, in the utility model, the flue gas first passes through the dust removal chamber 2, and the filter 21 filters the solid dust in the flue gas, thereby realizing the pretreatment of the flue gas; the flue gas after dust removal then enters the denitrification chamber 3 through the connecting air pipe 7, and the atomizing nozzle 31 sprays the atomized denitrification agent into the cavity 1, so that the cavity 1 is filled with abundant small droplets of the denitrification agent, and the small droplets of the denitrification agent fully contact with the flue gas, thereby increasing the contact surface area between the two reactants, improving the reaction speed, and making the reaction more thorough; and the spraying directions of the relatively arranged atomizing nozzles 31 intersect, so that the small droplets of the denitrification agent collide with each other and break into droplets of smaller size, further increasing the contact surface area between the two reactants on the basis of atomization, and further improving the reaction speed and the thoroughness of the reaction. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0074] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A waste gas treatment device for flue gas denitration, comprising a chamber (1), a dust removal chamber (2), and a denitration chamber (3), characterized in that: The cavity (1) is cylindrical, the lower part of the cavity (1) is provided with an air inlet (4), the upper part of the cavity (1) is provided with an air outlet (5), and a passage is formed inside the cavity (1) for smoke to pass from bottom to top; The dust removal chamber (2) is arranged at the lower part of the cavity (1), the lower part of the dust removal chamber (2) is in communication with the air inlet (4), and the dust removal chamber (2) has a replaceable filter screen (21) capable of filtering solid dust in the smoke; The denitration chamber (3) is arranged at the upper part of the cavity (1) and is isolated from the dust removal chamber (2) by a partition (6); the upper part of the denitration chamber (3) is connected to the gas outlet (5) and can absorb nitrogen oxides in the flue gas; A communicating air pipe (7) is provided between the denitration chamber (3) and the dust removal chamber (2); the communicating air pipe (7) is located outside the cavity (1) and two ends of the communicating air pipe (7) are respectively connected to the lower part of the side wall of the denitration chamber (3) and the upper part of the side wall of the dust removal chamber (2); The denitration chamber (3) comprises a plurality of atomizing nozzles (31) arranged on the inner wall of the cavity (1), each atomizing nozzle (31) being connected to an external denitration agent liquid pipeline to spray atomized denitration agent into the cavity (1); Each of the atomizing nozzles (31) is provided with at least one other atomizing nozzle (31) arranged opposite to it, so that the liquid droplets sprayed by the opposite atomizing nozzles (31) collide with each other and break into liquid droplets of smaller size.

2. The exhaust gas treatment device for flue gas denitrification according to claim 1, characterized in that: The atomizing nozzles (31) are symmetrically arranged relative to the center line of the cavity (1), and are evenly arranged from bottom to top along the height direction.

3. The exhaust gas treatment device for flue gas denitrification according to claim 2, characterized in that: The liquid outlet direction of each atomizing nozzle (31) is arranged along the horizontal direction.

4. The exhaust gas treatment device for flue gas denitrification according to claim 2, characterized in that: The liquid discharge direction of each atomizing nozzle (31) is arranged to be inclined downward or upward along the horizontal direction, and the atomizing nozzles (31) adjacent to each other in the height direction are arranged in opposite inclination directions.

5. A waste gas treatment device for flue gas denitrification according to claim 3 or 4, characterized in that: A liquid outlet (32) is provided at the lower part of the side wall of the denitration chamber (3), and the liquid outlet (32) is connected to an external waste liquid treatment device.

6. The exhaust gas treatment device for flue gas denitrification according to claim 5, characterized in that: The upper surface of the partition (6) is arranged to be inclined, and the liquid outlet (32) is located at the lowest point of the inclination of the partition (6).

7. The exhaust gas treatment device for flue gas denitrification according to claim 1, characterized in that: The air inlet (4) is located at the lower part of the side wall of the cavity (1), the air outlet (5) is located on the top surface of the cavity (1), and the end surface of the air outlet (5) is provided with a grid plate (51).

8. The exhaust gas treatment device for flue gas denitrification according to claim 7, characterized in that: The side wall of the cavity (1) is provided with a first connecting port (71) and a second connecting port (72); the first connecting port (71) is located at the lower side of the partition (6), and the second connecting port (72) is located at the upper side of the partition (6); and the two ends of the connecting air pipe (7) are respectively connected to the first connecting port (71) and the second connecting port (72).

9. The exhaust gas treatment device for flue gas denitrification according to claim 8, characterized in that: The dust removal chamber (2) comprises at least two layers of filter screens (21) arranged in sequence from bottom to top, each filter screen (21) is disc-shaped, each filter screen (21) is arranged parallel to each other, and each filter screen (21) is located at the bottom of the lowest point of the first connecting port (71).

10. The exhaust gas treatment device for flue gas denitrification according to claim 9, characterized in that: An activated carbon adsorption layer (22) is arranged on the uppermost filter screen (21); the activated carbon adsorption layer (22) is disc-shaped and is arranged parallel to the filter screen (21); the activated carbon adsorption layer (22) is located at the bottom of the lowest point of the first connecting port (71).

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