A flue gas treatment device

Abstract

The present invention relates to the technical field of flue gas treatment devices, and in particular to a flue gas treatment device, comprising a cylinder, a thin cylinder and an electrode tube, wherein the thin cylinder is arranged in the cylinder, an annular baffle is arranged in the hollow cavity between the thin cylinder and the cylinder, the thin cylinder, the cylinder and the annular baffle are insulated from each other, the annular baffle divides the hollow cavity into two mutually separated upper and lower cavities, the upper cavity is sealed, coarse quicklime particles are arranged in the upper cavity, an air inlet for flue gas input is arranged on the cylinder, the air inlet is connected with the lower cavity, a dust collecting bin connected with the cylinder is arranged below the cylinder, the device can simultaneously denitrify, remove sulfur, degrade organic matter and remove dust; for dust removal, tiny particles in smoke can be removed; for denitrification and desulfurization, the device can effectively remove residual acidic gases by washing with water and then absorbing the tail gas with lime and limestone.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment devices, and in particular to a flue gas treatment device. Background Art

[0002] Dust removal is the process of separating, capturing and recovering the particles in the smoke generated by the combustion of fuel and other materials. Common flue gas dust removal technologies include gravity dust removal such as cyclone separation, filtration dust removal such as bag dust removal, electrostatic dust removal, etc.

[0003] Traditional cyclone separators can only separate powders with larger particles, while small particles are still carried away during the movement of the airflow, which means that the equipment can only be used for primary dust removal; and bag dust removal has a large pressure drop, resulting in high energy consumption. Electrostatic dust removal requires huge investment, and it is difficult to have practical application for the flue gas from some small airflows and single small boilers. Small boilers have various fuel sources, so the smoke produced contains a variety of substances. It is necessary to remove large and small particles at the same time, including some acidic gases produced by combustion, such as nitrogen oxides, sulfur oxides, etc., as well as volatile organic compounds, such as alkanes, aromatics, etc., which are difficult to handle with conventional flue gas treatment devices. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that the existing flue gas treatment device is difficult to treat the tail gas of a small boiler with a small gas volume, a flue gas treatment device is provided.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a flue gas treatment device, including a cylinder, a thin cylinder and an electrode tube, the thin cylinder is arranged in the cylinder, an annular baffle is arranged in the hollow cavity between the thin cylinder and the cylinder, the thin cylinder, the cylinder and the annular baffle are insulated from each other, the annular baffle divides the hollow cavity into two mutually separated upper and lower cavities, the upper cavity is sealed, coarse quicklime particles are arranged in the upper cavity, an air inlet for flue gas input is arranged on the cylinder, the air inlet is connected to the lower cavity, the cylinder A dust collecting bin connected to it is arranged below, the lower cavity and the upper cavity are connected to each other through a thin cylinder, the cylinder is provided with an air outlet connected to the upper cavity, the electrode tube is arranged in the thin cylinder and is insulated from each other, a titanium mesh is arranged on the inner wall of the cylinder located at the lower cavity, a first nozzle and a second nozzle are arranged on the thin cylinder, the first nozzle is arranged on the outer peripheral wall of the thin cylinder and sprays water to the titanium mesh, the second nozzle is arranged on the inner peripheral wall of the thin cylinder and sprays water to the electrode tube, the titanium mesh is connected to the positive electrode, the thin cylinder is connected to the negative electrode, and the electrode tube is connected to the positive electrode.

[0006] In some preferred embodiments, the cylinder comprises a cylindrical section and a conical section connected to each other, the conical section is arranged between the cylindrical section and the dust collecting bin, and the small end of the conical section is located at the dust collecting bin.

[0007] In some preferred embodiments, a partition is provided in the dust collecting bin, which divides the dust collecting bin into two mutually separated sedimentation bins and a clean water bin; a submersible pump is provided in the clean water bin, and an output end of the submersible pump is respectively connected to the first nozzle and the second nozzle.

[0008] In some preferred embodiments, the length of the thin tube near one end of the dust collecting bin is smaller than the length of the round tube near one end of the dust collecting bin.

[0009] In some preferred embodiments, one end of the electrode tube close to the dust collecting bin is conical.

[0010] In some preferred embodiments, the thin tube is made of metallic titanium, and the inner and outer surfaces of the thin tube are covered with a titanium dioxide oxide layer.

[0011] In some preferred embodiments, the electrode tube is a tubular electrode and is made of stainless steel, and the outer surface of the electrode tube is covered with a lead dioxide coating.

[0012] The beneficial effects of the present invention are:

[0013] 1. The equipment can remove nitrogen, sulfur, degrade organic matter and remove dust at the same time; for dust removal, it can also remove tiny particles in smoke; for denitrification and desulfurization, the equipment can effectively remove residual acidic gases by washing with water and then absorbing the tail gas with lime and limestone.

[0014] 2. This equipment can use low-pressure electrolysis method for organic gas, which is simple and effective in saving electricity.

[0015] 3. The equipment has high integration, small footprint and simple operation. The present invention sets a spray inside the traditional cyclone separator and uses the spray to form low-pressure electrolysis. While the spray removes particulate matter and absorbs acidic gases, an electrolysis effect is formed, so that organic matter in the flue gas can be degraded. Finally, after being absorbed by alkaline materials, large and small particles, fine particles, acidic gases and organic matter in the flue gas can be completely removed.

[0016] 4. When the airflow passes through the charged water column, the organic molecules are polarized, making it easier for the organic matter to combine with water and dissolve in water.

[0017] 5. The titanium mesh lining the inner wall serves as an electrode and can increase the roughness of the inner wall, intercepting particles that collide with the inner wall so that the water flow can flush smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] In the figure: 1, cylinder, 101, cylindrical section, 102, conical section, 103, upper cavity, 104, lower cavity, 2, thin cylinder, 4, coarse quicklime particles, 5, annular baffle, 6, air inlet, 7, center sealing plate, 8, dust collecting bin, 81, sedimentation bin, 82, clean water bin, 83, submersible pump, 831, water pipe, 832, first nozzle, 833, second nozzle, 9, water inlet, 10, ash discharge door, 11, electrode tube, 12, air outlet. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with embodiments:

[0022] The present invention is not limited to the following specific embodiments. A person skilled in the art can implement the present invention in various other specific embodiments according to the contents disclosed in the present invention, or any simple changes or modifications made to the design structure and ideas of the present invention fall within the protection scope of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0025] like Figure 1 As shown, a flue gas treatment device comprises a vertically arranged cylinder 1, a thin cylinder 2 is coaxially sleeved in the cylinder 1, the lower end of the thin cylinder 2 is 10 cm to 20 cm shorter than the lower end of the cylinder 1, the upper end of the thin cylinder 2 is flush with the upper end of the cylinder 1, and an annular baffle 5 is arranged at the middle upper end between the cylinder 1 and the thin cylinder 2, the annular baffle 5 divides the space between the cylinder 1 and the thin cylinder 2 into an upper cavity 103 and a lower cavity 104 separated from each other, the upper cavity 103 is filled with quicklime coarse particles 4, and the lower cavity 104 is filled with quicklime coarse particles 4. The particle diameter is between 2cm and 10cm. An air inlet 6 is tangently arranged at a position of the cylinder 1 below the annular baffle 5. The cylinder 1 has a cylindrical section 101 and a conical section 102 connected in sequence. The small end of the conical section 102 is arranged on the dust collecting bin 8. The interior of the dust collecting bin 8 is divided by a partition into two mutually separated sedimentation bins 81 and a clean water bin 82. A submersible pump 83 is arranged in the clean water bin 82. A water injection port 9 is arranged on one side of the upper end of the dust collecting bin 8, and a dust discharge door 10 is arranged on one side of the lower end of the dust collecting bin 8.

[0026] A water pipe 831 is buried in the capillary 2, a first nozzle 832 is arranged on the outer peripheral wall of the capillary 2, a second nozzle 833 is arranged on the inner peripheral wall of the capillary 2, and the submersible pump 83 is connected with the first nozzle 832 and the second nozzle 833 respectively through the water connecting pipe 831, and the first nozzle 832 and the second nozzle 833 are tightly connected with the capillary 2.

[0027] A center sealing plate 7 is arranged inside the thin tube 2 at a distance of 10 cm to 40 cm above the cylinder 1. The center sealing plate 7 separates the thin tube 2 from the top and bottom. An electrode tube 11 is arranged insulated downward at the center of the center sealing plate 7. The lower end of the electrode tube 11 is conical, and the length of the electrode tube 11 is similar to that of the thin tube 2.

[0028] The thin tube 2 is provided with a sieve hole at the center sealing plate 7, and the sieve hole connects the inside of the thin tube 2 with the upper cavity 103, and the upper cavity 103 is connected with the gas outlet 12. The thin tube 2 is made of titanium metal, and the inner and outer peripheral walls of the thin tube 2 are processed and covered with a titanium dioxide oxide layer;

[0029] The electrode tube 11 is a tubular electrode, and the electrode tube 11 is made of stainless steel. The outer surface of the electrode tube 11 is treated and covered with a lead dioxide coating;

[0030] The inner wall of the cylinder 1 is lined with a titanium mesh, which is treated and covered with titanium dioxide. The titanium mesh lining the cylinder 1 is connected to the positive electrode of the DC power supply, the thin cylinder 2 is connected to the negative electrode of the DC power supply, and the electrode tube 11 is connected to the positive electrode of the DC power supply. The power supply voltage is 20V-35V. The top between the cylinder 1 and the thin cylinder 2 is a closed structure, and the top of the thin cylinder 2 is an open structure to form an air outlet 12. The air outlet 12 at the top of the cylinder 1 is connected to the fan.

[0031] During operation, the dust collecting bin 8 is filled with water, the titanium mesh lining the cylinder 1 is connected to the positive electrode of the DC power supply, the thin cylinder 2 is connected to the negative electrode of the DC power supply, and the electrode tube 11 is connected to the positive electrode of the DC power supply. There is a potential difference between the thin cylinder 2 and the titanium mesh, and there is also a potential difference between the thin cylinder 2 and the middle electrode tube 11. The submersible pump 83 is started, and the first nozzle 832 and the second nozzle 833 spray water columns. The first nozzle 832 sprays water columns to form an electrolytic circuit between the thin cylinder 2 and the titanium mesh, and the second nozzle 833 sprays water columns to form an electrolytic circuit between the thin cylinder 2 and the middle electrode tube 11.

[0032] Start the external fan, and the smoke is sucked into the cylinder 1 along the tangent from the air inlet 6, and rotates downward between the cylinder 1 and the fine cylinder 2. Large particles and fine particles of dust that have absorbed water are thrown to the inner wall of the cylinder 1 due to the centrifugal effect. Due to the presence of the titanium mesh, these particles are intercepted by the titanium mesh after hitting the inner wall of the cylinder 1, and then washed by water, and finally fall into the dust collecting bin 8. The first nozzle 832 continues to spray water, so that even if the particles in the airflow do not hit the wall of the cylinder 1 due to the centrifugal force, they are washed to the inner wall of the cylinder 1 by the water, and precipitated in the sedimentation bin 81 of the dust collecting bin 8, and the supernatant overflows from the sedimentation bin 81 to the clean water bin 82, so that the submersible pump 83 continues to supply water to the first nozzle 832 and the second nozzle 833.

[0033] The function of the titanium mesh on the cylinder 1 is as follows:

[0034] a. Increasing the roughness of the inner wall of the cylinder 1 increases the friction between the rotating particles and the inner wall of the cylinder 1, making it easier to reduce the speed of the particles and be washed away by the spraying water;

[0035] b. Increase the amount of water droplets that splash from the water column sprayed from the first nozzle 832 to the inner wall of the cylinder 1 and form droplets, which can fully contact with the small particles;

[0036] c. The titanium mesh becomes an electrode. When the water sprayed by the first nozzle 832 connects the thin cylinder 2 and the cylinder 1, the water flow becomes a conductor, making the thin cylinder 2 and the cylinder 1 a passage, and the titanium mesh of the cylinder 1 becomes an electrode;

[0037] d. The surface of the titanium mesh is oxidized into titanium dioxide and becomes an electrode catalyst layer.

[0038] An electrolytic circuit is formed between the thin tube 2 and the titanium mesh, and between the thin tube 2 and the middle electrode tube 11. When the air flow flows through this electrolytic circuit, the organic molecules are polarized, making it easier for the organic matter to combine with water and dissolve in the water column. The dissolved organic matter is degraded under the catalytic effect of the electric current and the titanium dioxide on the surface of the thin tube 2 and the titanium mesh.

[0039] As the airflow swirls to the conical section 102 at the lower end of the bottom cylinder 1, it turns back and rises, and enters the thin cylinder 2, and continues to be washed by the water column generated by the second nozzle 833. The water column connects the inner wall of the thin cylinder 2 and the electrode tube 11 to form an electrolytic circuit, and continues to electrocatalytically oxidize the dissolved organic matter;

[0040] Acidic gases in the flue gas, such as nitrogen oxides and sulfur oxides, are fully leached and dissolved as they flow along with the airflow. As the water flows into the dust collecting bin 8, the airflow carries a small amount of nitrogen oxides and sulfur oxides that have not been completely absorbed through the sieve holes at the top of the capillary 2 into the quicklime and limestone particles in the upper cavity 103, and reacts with the surfaces of the quicklime and limestone particles. The acidic gases are completely absorbed by the quicklime and limestone, so that the flue gas is completely purified.

[0041] After a period of operation, if there is too much dust deposited in the dust collecting bin 8 , it can be removed from the dust discharge door 10 . If the water in the dust collecting bin 8 decreases, water is poured in from the water injection port 9 .

[0042] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A flue gas treatment device, characterized in that: The invention comprises a cylinder (1), a thin cylinder (2) and an electrode tube (11), wherein the thin cylinder (2) is arranged inside the cylinder (1), an annular baffle (5) is arranged inside the hollow body between the thin cylinder (2) and the cylinder (1), the thin cylinder (2), the cylinder (1) and the annular baffle (5) are insulated from each other, the annular baffle (5) divides the hollow body into two mutually separated upper cavities (103) and lower cavities (104), the upper cavities (103) are sealed, quicklime coarse particles (4) are arranged inside the upper cavities (103), an air inlet (6) for smoke input is arranged on the cylinder (1), the air inlet (6) is communicated with the lower cavities (104), a dust collecting bin (8) communicated with the cylinder (1) is arranged below the cylinder (1), The lower cavity (104) and the upper cavity (103) are connected to each other through the thin cylinder (2); the cylinder (1) is provided with an air outlet (12) connected to the upper cavity (103); the electrode tube (11) is arranged in the thin cylinder (2) and is insulated from each other; a titanium mesh is arranged on the inner wall of the cylinder (1) located at the lower cavity (104); a first nozzle (832) and a second nozzle (833) are arranged on the thin cylinder (2); the first nozzle (832) is arranged on the outer peripheral wall of the thin cylinder (2) and sprays water to the titanium mesh; the second nozzle (833) is arranged on the inner peripheral wall of the thin cylinder (2) and sprays water to the electrode tube (11); the titanium mesh is connected to the positive electrode, the thin cylinder (2) is connected to the negative electrode, and the electrode tube (11) is connected to the positive electrode.

2. A flue gas treatment device according to claim 1, characterized in that: The cylinder (1) comprises a cylindrical section (101) and a conical section (102) which are connected to each other. The conical section (102) is arranged between the cylindrical section (101) and the dust collecting bin (8), and the small end of the conical section (102) is located at the dust collecting bin (8).

3. A flue gas treatment device according to claim 1, characterized in that: A partition is provided in the dust collecting bin (8), and the partition divides the dust collecting bin (8) into two mutually separated sedimentation bins (81) and a clean water bin (82). A submersible pump (83) is provided in the clean water bin (82), and the output end of the submersible pump (83) is respectively connected to the first nozzle (832) and the second nozzle (833).

4. A flue gas treatment device according to claim 1, characterized in that: The length of the thin cylinder (2) at one end close to the dust collecting bin (8) is shorter than the length of the cylinder (1) at one end close to the dust collecting bin (8).

5. A flue gas treatment device according to claim 4, characterized in that: One end of the electrode tube (11) close to the dust collecting bin (8) is conical.

6. A flue gas treatment device according to claim 1, characterized in that: The material of the thin tube (2) is metallic titanium, and the inner and outer surfaces of the thin tube (2) are covered with a titanium dioxide oxide layer.

7. A flue gas treatment device according to claim 1, characterized in that: The electrode tube (11) is a tubular electrode and is made of stainless steel. The outer surface of the electrode tube (11) is covered with a lead dioxide coating.

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