A flue gas high uniform mixing desulfurization efficiency enhancement device

Abstract

The present invention discloses a flue gas high-uniform mixing desulfurization efficiency enhancement device, which belongs to the field of tail gas treatment in coal-fired power plants. The present invention comprises a plurality of air supply pipes arranged in the slurry and flue gas mixed reaction layer in the desulfurization tower, and a plurality of pneumatic sound sources are arranged on the air supply pipes. The present invention is arranged at the height of the slurry and flue gas reaction layer, and uses the high-intensity sound waves generated by the Hartmann whistle pneumatic sound source to cause the air flow disturbance to generate a vortex, that is, an acoustic vortex, so that the desulfurized slurry and the flue gas can achieve a higher mixing uniformity in the process of vortex crushing and reorganization of different scales, and significantly improve the desulfurization effect. It can improve the uniformity of mixing of slurry droplets and flue gas while reducing the flue gas circulation resistance, greatly improve the flue gas desulfurization efficiency, and has important practical significance.

Description

Technical Field

[0001] The invention relates to the field of tail gas treatment in coal-fired power plants, and in particular to a flue gas high-uniform mixing desulfurization efficiency enhancement device. Background Art

[0002] Green environmental protection is the theme of today's social and economic development, which requires environmental protection and energy conservation. In today's society, the demand for electricity is growing. my country has built a huge number of coal-fired power plants, and the desulfurization treatment of exhaust gas has attracted widespread attention. Therefore, efficient removal of SO2 from flue gas is a major challenge in my country's energy conservation and emission reduction process.

[0003] At present, wet desulfurization technology is mostly used in large and medium-sized coal-fired power plants in my country. This technology sprays alkaline slurry, such as limestone slurry, into the desulfurization tower, allowing it to mix and react with the flue gas in reverse flow to achieve the purpose of removing SO2.

[0004] The existing wet flue gas desulfurization tower is generally equipped with a flue gas distributor, but the flue gas distributor often increases the flow resistance of the flue gas and increases the load of the induced draft fan. At the same time, the installation and maintenance of the device in the desulfurization tower is relatively cumbersome, which increases the investment of time and money. In the existing flue gas efficiency improvement device for flue gas, the rectification and distribution of the flue gas only uses a simple mechanical structure to rectify its flue gas distribution, which cannot really reduce the resistance and improve the uniformity, and often increases the flow resistance, increases the burden of the induced draft fan, and increases the energy consumption of the overall system, which is inconsistent with energy conservation and emission reduction.

[0005] For example, the utility model patent with application number 201620895092.9 discloses a flue gas distribution device for a flue gas desulfurization and denitrification spray absorption tower, the scheme is: including a plurality of distribution plates and a plurality of support structures, the support structure is installed on the inner wall of the spray absorption tower, the distribution plate is placed on the support structure and is detachably connected to the support structure, and the cross-sectional shape of the distribution plate is a mesh; another example is the invention patent with application number 201420256330.2 discloses a flue gas distribution device in a wet flue gas desulfurization tower, the scheme is: a conical disc-shaped flue gas distribution device is arranged in the desulfurization tower, the conical disc includes a circular edge and a conical wall surface; the wall surface has a through hole. Both of them are used to set a mechanical rectification device on the flue gas flow cross section to enhance the uniformity of its flue gas distribution, but the disadvantages are that the device is simple, the rectification effect is general, and the flow resistance of the flue gas is increased, which brings additional load to the induced draft fan and increases the energy consumption of the system. In addition, the flue gas flow channel is narrow and easily blocked by impurities, which further increases the flue gas flow resistance.

[0006] In order to improve the flue gas desulfurization efficiency with the lowest energy consumption possible, we cannot use a simple mechanical structure to guide the flow, but should seek new processes to improve the efficiency of flue gas desulfurization technology. Summary of the invention

[0007] In order to make up for the deficiencies of the prior art, the present invention provides a flue gas highly uniform mixing desulfurization efficiency enhancement device.

[0008] The technical solution of the present invention is:

[0009] A flue gas high uniform mixing desulfurization efficiency enhancement device, characterized in that it comprises a plurality of air supply pipes arranged in the slurry and flue gas mixed reaction layer in the desulfurization tower, and a plurality of pneumatic sound sources are arranged on the air supply pipes. The air supply pipes provide compressed air or compressed steam to the pneumatic sound sources, and the pneumatic sound sources generate a high-intensity sound field, so that the slurry and flue gas mixed reaction layer in the desulfurization tower generates a large number of vortices of different sizes, promotes the desulfurization reaction, and greatly improves the desulfurization effect.

[0010] As a preferred solution, a fixed bracket as a load-bearing component is provided below the air supply pipeline. The fixed bracket is used to support the air supply pipeline and the pneumatic sound source, and is also used to fix the air supply pipeline, so that the entire desulfurization efficiency enhancement device is stable and reliable.

[0011] As a preferred solution, the pneumatic sound source includes a resonance cavity, an air inlet and an air outlet; an air inlet base is provided below the air inlet; a cavity protection cover is provided on the outside of the resonance cavity, and the cavity protection cover is fixed to the air inlet base; and an air outlet is provided on the cavity protection cover. The pneumatic sound source is a Hartmann whistle structure, and a cavity protection cover is provided on the outside of the resonance cavity, with a gap between the cavity protection cover and the resonance cavity, so that the cavity protection cover protects the resonance cavity from being in the slurry and airflow, thereby preventing the inability to effectively resonate and sound due to impurities adhering to the wall of the resonance cavity.

[0012] Furthermore, the air inlet base of the pneumatic sound source is threadedly connected to the air supply pipeline.

[0013] As a preferred solution, a central baffle is provided in the resonance cavity, which divides the resonance cavity into two cavities, thereby improving the utilization efficiency of compressed air or compressed steam.

[0014] As a preferred solution, a sound amplification horn is installed at the air outlet of the cavity protection cover.

[0015] As a preferred solution, the top of the cavity protection cover is conical. The top of the cavity protection cover is conical, which is not easy to cause impurities to accumulate.

[0016] As a preferred solution, the pneumatic sound sources on the air supply pipeline are evenly distributed.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention is arranged at the height of the slurry and flue gas reaction layer, and uses the high-intensity sound waves generated by the Hartmann whistle pneumatic sound source to cause the airflow disturbance to generate a vortex, that is, a sonic vortex, so that the desulfurized slurry and flue gas can achieve a higher mixing uniformity in the process of vortex crushing and reorganization of different scales, and significantly improve the desulfurization effect. The present invention can reduce the flow resistance of flue gas while improving the uniformity of mixing slurry droplets and flue gas, greatly improving the flue gas desulfurization efficiency, and has considerable practical significance.

[0019] 2. The present invention is provided with a sound amplification horn to amplify the power of sound waves, thereby improving energy conversion efficiency and saving energy.

[0020] 3. The gas source of the present invention can come from compressed air or compressed steam, and these resources are relatively abundant for coal-fired power plants; therefore, the present invention is particularly suitable for desulfurization towers in coal-fired power plants.

[0021] 4. The present invention has a simple structure, low cost, is easy to install, and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 This is a schematic diagram of the structure of the flue gas high uniform mixing desulfurization efficiency enhancement device arranged in a desulfurization tower according to the present invention;

[0024] Figure 2 It is a structural schematic diagram of the pneumatic sound source in the present invention;

[0025] Figure 3 for Figure 1 A schematic diagram of the structure of a certain transverse section;

[0026] Figure 4 for Figure 3 A schematic diagram of a structure in which a fixed bracket is arranged below the central air supply pipeline;

[0027] Figure 5 for Figure 4 Schematic diagram of the structure of the fixed bracket. DETAILED DESCRIPTION

[0028] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal" 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 purpose of describing the present invention rather than requiring the present invention to be constructed or operated in a specific position, and therefore should not be construed as limiting the present invention. The terms "connected" and "connected" in the present invention should be understood in a broad sense, for example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] Example 1

[0030] like Figure 1 As shown, the desulfurization tower 1 is provided with a flue gas inlet 3, a flue gas outlet 6, a spray layer 2, etc. The flue gas high uniform mixing desulfurization efficiency enhancement device of the present invention is arranged in the slurry and flue gas mixed reaction layer in the desulfurization tower 1.

[0031] like Figure 1 , Figure 2 , Figure 3 As shown, the flue gas high uniform mixing desulfurization efficiency enhancement device of the present invention comprises an air supply pipeline 5 arranged in the slurry and flue gas mixed reaction layer in the desulfurization tower 1, and a pneumatic sound source 4 is arranged on the air supply pipeline 5. Figure 4 , Figure 5 As shown, in order to prevent the gas supply pipeline 5 from bending and deformation, a corresponding fixing bracket 15 is arranged under the gas supply pipeline 5 , and the fixing bracket 15 is welded to the inner wall of the desulfurization tower 1 .

[0032] The air supply pipeline 5, the pneumatic sound source 4 and the fixed bracket 15 are all made of heat-resistant and corrosion-resistant alloys, have good adaptability in the internal environment of the desulfurization tower, and have a long service life.

[0033] The air supply pipe 5 inputs high-pressure gas to the pneumatic sound source 4, causing the pneumatic sound source 4 to emit high-intensity sound waves. The high-intensity sound wave airflow generates a vortex, and the slurry droplets are evenly mixed with the airflow.

[0034] Example 2

[0035] like Figure 1 As shown, the desulfurization tower 1 is provided with a flue gas inlet 3, a flue gas outlet 6, a spray layer 2, etc. The flue gas high uniform mixing desulfurization efficiency enhancement device of the present invention is arranged in the slurry and flue gas mixed reaction layer in the desulfurization tower 1.

[0036] like Figure 1 , Figure 2 , Figure 3 As shown, the flue gas high uniform mixing desulfurization efficiency enhancement device of the present invention comprises an air supply pipeline 5 arranged in the slurry and flue gas mixed reaction layer in the desulfurization tower 1, and a pneumatic sound source 4 is arranged on the air supply pipeline 5. Figure 4 , Figure 5 As shown, in order to prevent the gas supply pipeline 5 from bending and deformation, a corresponding fixing bracket 15 is arranged under the gas supply pipeline 5 , and the fixing bracket 15 is welded to the inner wall of the desulfurization tower 1 .

[0037] The air supply pipeline 5, the pneumatic sound source 4 and the fixed bracket 15 are all made of heat-resistant and corrosion-resistant alloys, have good adaptability in the internal environment of the desulfurization tower, and have a long service life.

[0038] Specifically, the gas supply pipeline 5 is divided into three pipelines, and the ends of the three gas supply pipelines 5 intersect. The three gas supply pipelines 5 are formed in one piece, and the intersection is connected to the three gas supply pipelines 5. The starting end of the gas supply pipeline 5 is connected to the gas source through a gas transmission pipeline passing through the wall of the desulfurization tower 1; a valve is set on the gas transmission pipeline.

[0039] The pneumatic sound source 4 is a Hartmann whistle structure, specifically, including a resonance cavity 8, an air inlet 12, and an air outlet 14, wherein the air inlet 12 is arranged on an air inlet base 13; in this specific embodiment, the inner diameter of the resonance cavity is 10-15 mm, and the thickness of the cavity wall is 4-8 mm; a central baffle 9 is arranged in the middle of the resonance cavity 8, and the central baffle 9 divides the resonance cavity 8 into two chambers to improve the utilization efficiency of compressed air or compressed steam. The top of the central baffle 9 is fixed to the top of the resonance cavity 8, and the lower part of the central baffle 9 is fixed to the air inlet base 13. In order to avoid the adhesion of impurities to the wall of the resonance cavity, which leads to the inability to effectively resonate and sound, a cavity protection cover 7 is arranged outside the resonance cavity 8, and the inner diameter of the cavity protection cover 7 is 18-20 mm, and the wall thickness is 5-10 mm; there is a gap between the cavity protection cover 7 and the resonance cavity 8, and the lower part of the cavity protection cover 7 is fixed to the air inlet base 13. The cavity protection cover 7 is provided with an air outlet 11, and a loudspeaker 10 is installed at the air outlet 11; the loudspeaker 10 is welded or threadedly connected to the cavity protection cover 7. The diameter of the fixed end of the loudspeaker horn is 3-4 mm, and the diameter of the other end is 20-25 cm.

[0040] The air supply pipe 5 is provided with an interface for connecting to the air inlet base 13 in the pneumatic sound source 4, and the interface is threadedly connected to the air inlet base 13, so that the pneumatic sound source 4 and the air supply pipe 5 are connected as a whole.

[0041] At least one pneumatic sound source 4 is arranged on each air supply pipeline 5 , and each pneumatic sound source 4 on each air supply pipeline 5 is provided with two amplifying horns 10 , which are arranged in opposite directions.

[0042] A pneumatic sound source 4 is arranged at the intersection of the three air supply pipes 5. The pneumatic sound source 4 at the intersection is provided with three amplifying horns 10. The three amplifying horns 10 are oriented toward the area where the sound wave effect is weak, such as Figure 3 or Figure 4As shown, this makes up for the problem of insufficient sound power of the outer ring sound source due to the long sound wave propagation distance.

[0043] After the flue gas high uniform mixing desulfurization efficiency enhancement device of the present invention is arranged in the slurry and flue gas mixed reaction layer in the desulfurization tower 1, the air supply pipeline 5 provides compressed air or compressed steam with a pressure of 0.4-0.6MPa to the pneumatic sound source 4, and the air supply volume is 20-40m 3 / h, providing a suitable and stable air source for the pneumatic sound source to ensure its efficient operation. Compressed air or compressed steam flows into the resonance cavity 8. When the compressed air or compressed steam flows between the resonance cavity 8 and the air inlet 12, the pressure changes periodically due to the squeezing between the gases, which excites strong sound waves with a frequency of 4 to 6 kHz. That is, each pneumatic sound source 4 generates a strong sound wave with a frequency of 4 to 6 kHz, and the airflow generates a vortex, and the slurry droplets are evenly mixed with the airflow. The loudspeaker 10 is used to amplify the sound power so that the sound pressure level after passing through the loudspeaker horn reaches 140-160dB. The strong sound field disturbance causes a large number of vortices of different sizes to appear in the airflow, and such vortices are prone to breakage and recombination. The slurry droplets and the flue gas airflow are driven by the vortex and fully mixed and reacted, which improves the uniformity of the mixing of the slurry and the flue gas and improves the desulfurization effect.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A flue gas high uniform mixing desulfurization efficiency enhancement device, characterized by: It comprises a plurality of air supply pipes arranged in the slurry and flue gas mixed reaction layer in the desulfurization tower, and a plurality of pneumatic sound sources are arranged on the air supply pipes; The pneumatic sound source includes a resonance cavity, an air inlet and an air outlet; an air inlet base is arranged below the air inlet; a cavity protection cover is arranged outside the resonance cavity, and the cavity protection cover is fixed to the air inlet base; an air outlet is arranged on the cavity protection cover; A central baffle is arranged in the resonance cavity; and a sound amplification horn is installed at the air outlet of the cavity protection cover.

2. The flue gas high uniform mixing desulfurization efficiency enhancement device according to claim 1, characterized in that: A fixed bracket serving as a load-bearing component is arranged below the air supply pipeline.

3. The flue gas high uniform mixing desulfurization efficiency enhancement device according to claim 1, characterized in that: The air inlet base of the pneumatic sound source is threadedly connected to the air supply pipeline.

4. The flue gas high uniform mixing desulfurization efficiency enhancement device according to claim 1, characterized in that: The top of the cavity protection cover is conical.

5. The flue gas high uniform mixing desulfurization efficiency enhancement device according to claim 1, characterized in that: The pneumatic sound sources on the air supply pipeline are evenly distributed.

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