Modular ultrasonic atomization method for flue gas deacidification

Abstract

This invention discloses a modular ultrasonic atomization method for flue gas deacidification. It includes the following steps: Step 1: The flue gas to be deacidified flows in from one side of the top flue of the modular ultrasonic atomization device for flue gas deacidification; a portion of the flue gas enters the heated blower flue through the inlet area, and a portion enters the downstream of the top flue; Step 2: The high-temperature flue gas heats the NaOH solution in the atomization chamber; Step 3: Particulate matter intercepted by the flue gas is collected and removed in the ash collection trough; Step 4: The flue gas is blown into the atomization chamber at high speed; Step 5: While the flue gas is blowing NaOH atomization gas in the atomization chamber, the heating of the atomization gas and the deacidification reaction process are simultaneously completed, achieving staged heating and staged deacidification effects. This invention solves the problems of requiring blowers and heating equipment in ultrasonic atomization devices for flue gas deacidification, and the problem of easy scaling on the pipe wall caused by instantaneous contact between the absorbent NaOH atomization gas and high-temperature flue gas; it has the advantages of cost saving, prevention of wall adhesion and scaling, and ensuring deacidification effect.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, and more specifically to a modular ultrasonic atomization method for flue gas deacidification. Background Technology

[0002] Ultrasonic atomization deacidification utilizes high-frequency ultrasonic oscillations to generate cavitation, tearing, and explosion phenomena under alternating positive and negative pressure, ultimately atomizing the absorbent NaOH solution into aerosol with a particle size of about 5-10 μm. The smaller the aerosol particle size, the larger the specific surface area, which is more conducive to the deacidification reaction between acidic gases in flue gas and NaOH aerosol.

[0003] With the government encouraging technological innovation, ultrasonic atomization deacidification technology has been further developed in the field of air pollution control, addressing the need for further reduction of acid gas emission concentrations in flue gas from certain industries that has low SO2 concentrations or flue gas after preliminary purification.

[0004] However, in practical applications, this technology has the following problems: 1) To ensure that the absorbent aerosol can smoothly enter the positive pressure flue, the ultrasonic atomization deacidification system needs to be equipped with a blower, which increases equipment investment and operating costs; 2) To ensure that the atomization module can achieve the best atomization amount and atomization effect, the NaOH solution in the atomization box needs to be heated to a certain temperature, so a heating device needs to be installed in the atomization box, which increases equipment investment and operating costs; 3) The ultrasonic atomized aerosol comes into direct contact with the high-temperature flue gas instantaneously, and it is very easy to adhere and stick to the inner wall structure of the absorbent aerosol addition area, causing scaling after long-term operation; 4) The distance between the atomization device aerosol outlet and the NaOH aerosol addition position is far, and the NaOH aerosol is easy to condense on the wall during the transmission process and flow back to the atomization box, which reduces the actual output of the atomizer and the deacidification effect is not as expected; or to ensure the deacidification effect, more atomization modules need to be configured, resulting in additional investment costs. Therefore, it is necessary to develop a new ultrasonic atomization method for flue gas deacidification that saves equipment investment and operating costs, prevents adhesion and scaling on the inner wall structure of the absorbent aerosol dosing zone, and ensures the deacidification effect. Summary of the Invention

[0005] The purpose of this invention is to provide a modular ultrasonic atomization method for flue gas desulfurization, achieving the dual effects of staged heating and staged desulfurization, ensuring desulfurization efficiency, saving investment and operating costs of electric heating equipment and blowers, reducing the footprint, and preventing adhesion and scaling on the inner wall structure of the absorbent NaOH atomization area. It also solves problems such as the need for blowers and heating equipment in ultrasonic atomization devices for flue gas desulfurization, the large distance between the atomization outlet and the absorbent NaOH atomization addition position leading to condensation and backflow, and the instantaneous direct contact between the absorbent NaOH atomization and high-temperature flue gas causing scaling on the pipe wall.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a modular flue gas deacidification ultrasonic atomization method, characterized in that: the flue gas to be deacidified flows in from one side of the top flue of the modular flue gas deacidification ultrasonic atomization device; under the action of the flue gas guide plate of the atomization box, a portion of the flue gas enters the heating blower flue of the atomization box to heat the NaOH solution in the atomization box; simultaneously, the cooled flue gas increases in velocity after passing through the flue gas outlet grille, sending the NaOH atomized gas mist in the atomization box to the atomization box ...

[0007] The specific method includes the following steps:

[0008] Step 1: The flue gas to be deacidified flows into the top flue of the modular flue gas deacidification ultrasonic atomizing device from one side. Part of the flue gas enters the heated blower flue through the flue gas inlet area, and part of the flue gas enters the downstream of the top flue.

[0009] Step 2: High-temperature flue gas enters from the top down through the first, second, third, and fourth small flue ducts at the bottom of the atomizing box from the smoke inlet area. As the cross-section of the smoke inlet area decreases, the smoke velocity increases. The heated flue gas is then discharged through the fifth, sixth, seventh, and eighth small flue ducts at the bottom of the atomizing box, respectively. The heat of the flue gas itself is used to heat the NaOH solution inside the atomizing box.

[0010] Step 3: The flue gas flowing out from the fifth, sixth, seventh, or eighth small flue passes through the ash removal baffle, which effectively intercepts the particulate matter entrained in the flue gas. The flue gas then flows out through the gap between the ash removal baffle and the ash collection trough, and enters the smoke outlet area upwards. The intercepted particulate matter collects in the ash collection trough and is periodically removed, effectively reducing the amount of particulate matter in the flue gas entering the atomization box and ensuring the atomization effect of the NaOH absorbent solution in the atomization box.

[0011] Step 4: The flue gas entering the exhaust area of ​​the heated blower flue is discharged through the exhaust port grille on the exhaust area panel, further reducing the flow area and increasing the smoke velocity; under the directional guidance of the exhaust gas flow by the guide plate behind the grille, the flue gas discharged from the exhaust port grille is blown into the atomizing box at high speed.

[0012] Step 5: The flue gas discharged from the exhaust grille blows the NaOH mist from the atomizing box into the top flue, where it reacts with the flue gas in the top flue to undergo a deacidification reaction. The flue gas blown into the atomizing box through the exhaust grille heats the absorbent mist (i.e., NaOH mist) in the atomizing box, while also undergoing a partial deacidification reaction. The flue gas downstream in the top flue further heats the absorbent NaOH mist blown into the atomizing box through the mist outlet and completes the deacidification reaction, thus achieving a staged heating and staged deacidification effect.

[0013] In the above technical solution, in step one, the amount of smoke entering the atomizing box for heating is changed by adjusting the rotating shaft of the flue gas guide plate at the top flue inlet.

[0014] In the above technical solution, in step five, the method for generating NaOH mist is as follows: NaOH solution is added through the absorbent inlet of the atomizing box, heated by the high-temperature flue gas in the heated blower flue at the bottom of the atomizing box, and generated into NaOH mist with a particle size of 5-10 μm under the action of the ultrasonic atomizing module; the NaOH mist flows into the top flue along the mist outlet of the atomizing box under the blowing action of the high-speed flue gas at the flue outlet grille, and mixes with the flue gas to be deacidified to carry out the deacidification reaction.

[0015] In the above technical solution, in step five, when the NaOH solution level in the atomizing box is lower than the optimal set value from the upper surface of the atomizing module, the NaOH solution is discharged from the overflow port to maintain the stability of the NaOH absorbent level in the atomizing box and ensure that the atomizing module produces a stable amount of mist.

[0016] In the above technical solution, the atomization status and working status of the atomization module inside the atomization box can be viewed through the atomization box observation window; at the same time, the atomization box observation window serves as an inspection port when the atomization module is replaced; when the atomization module is repaired or replaced, or when there are many impurities at the bottom of the atomization box structure that need to be cleaned, the solution inside the atomization box is discharged through the drain port at the bottom.

[0017] In the above technical solution, the modular flue gas desulfurization ultrasonic atomization device includes a top flue, an atomization box, a heated blower flue, and a gravity ash removal device.

[0018] The top flue is located at the top of the atomizing box;

[0019] The gravity-type ash removal device is located inside the heated blast flue.

[0020] The heating blower flue is located on the right side and bottom of the atomizing box; the heating blower flue is connected to the top flue and the atomizing box respectively.

[0021] In the above technical solution, the atomizing box flue is located inside the top flue and installed at the connection between the top flue and the smoke inlet area.

[0022] In the above technical solution, the atomizing box includes an atomizing module, an aerosol outlet guide plate, an atomizing box observation window, an absorbent inlet, an overflow outlet, a vent outlet, an atomizing box body structure, and an atomizing box aerosol outlet.

[0023] The atomizing box has a hollow structure.

[0024] The atomizing module is located inside the atomizing box structure and at the bottom of the atomizing box structure;

[0025] The atomizing box's mist outlet is located at the upper side of the atomizing box's structure and downstream of the top flue.

[0026] The aerosol outlet guide plate is installed at the aerosol outlet of the atomizing box and is located inside the top flue.

[0027] The observation window of the atomizing box is located on the side wall of the atomizing box structure;

[0028] The absorbent inlet is installed on the side wall of the atomizing box structure and is located above the atomizing module;

[0029] The overflow port is located on the side wall of the atomizing box structure, between the absorbent inlet and the atomizing module;

[0030] The vent is installed at the bottom of the atomizing box structure and below the atomizing module.

[0031] In the above technical solution, the heating blower flue is located on the outside of the atomizing box structure, and is located on the right side and bottom of the atomizing box structure;

[0032] The heated air duct includes an inlet duct and an exhaust duct; the exhaust ducts are located on both sides of the inlet duct.

[0033] The smoke inlet channel includes a first small smoke duct, a second small smoke duct, a third small smoke duct, and a fourth small smoke duct, all of which are connected to the smoke inlet area;

[0034] The smoke exhaust channels include the fifth, sixth, seventh, and eighth small smoke ducts, all of which are connected to the smoke outlet area.

[0035] The first, second, fifth, and sixth small flues are all interconnected structures;

[0036] The third and fourth small flues, and the seventh and eighth small flues are all interconnected structures;

[0037] A smoke outlet grille is installed in the smoke outlet area; the heating blower flue is connected to the atomizing box structure through the smoke outlet grille.

[0038] In the above technical solution, the gravity ash removal device includes an ash removal baffle and an ash collection trough;

[0039] The ash collection trough is located inside the heated blower flue and is connected to the exhaust duct;

[0040] One end of the ash removal baffle is installed on the wall of the smoke outlet area, and the other end extends downward to the top of the bottom plate of the ash accumulation trough.

[0041] The modular ultrasonic atomization method for flue gas deacidification proposed in this invention utilizes the inherent energy of the flue gas (thermal and kinetic energy), combined with the internal flow channel design of the atomizer, to achieve the following functions:

[0042] (1) The present invention utilizes the temperature of the raw flue gas to be deacidified to heat the NaOH solution of the atomizing absorbent. The flue gas guide plate of the atomizing box introduces some high-temperature flue gas, and uses the heat of the flue gas itself to heat the NaOH solution of the absorbent in the atomizing box. The solution temperature rises and the atomization effect is better. Therefore, it is not necessary to configure a special electric heating device in the atomizing box.

[0043] (2) The internal flue of the atomizing box is optimized and designed according to the cross-sectional changes of the heating flue. The flow area is gradually reduced to raise the flue gas. Finally, a high-speed airflow is formed in the smoke outlet grille of the smoke outlet area in the atomizing box, which has a blowing effect. Therefore, there is no need to configure a special blower in the atomizing box.

[0044] (3) The top of the atomizing box and the lower part of the flue are designed as one piece, and the atomizing box atomization outlet is directly connected to the flue; this overcomes the phenomenon of atomization amount being reduced due to atomization and condensation on the wall of the long-distance channel.

[0045] (4) After the flue gas entering the atomizing box heats the NaOH absorbent solution in the atomizing box, the temperature decreases. After passing through the air outlet grille, it comes into contact with the mist in the atomizing box, reducing the risk of the mist being instantly dried out. At the same time, it completes part of the reaction between the acidic gas and the NaOH absorbent mist. Then, it enters the top flue through the mist outlet of the atomizing box, achieving the dual effects of staged heating and staged acid removal. It effectively avoids the scaling phenomenon caused by direct contact between the mist and the high-temperature flue gas.

[0046] (5) Install a gravity-type ash removal device to prevent particulate matter in the flue gas from entering the atomization box and reduce the impact on the atomization effect of the absorbent NaOH solution. Attached Figure Description

[0047] Figure 1 This is a three-dimensional structural diagram of the ultrasonic atomization deacidification device in this invention.

[0048] Figure 2 This is a front view of the ultrasonic atomization deacidification device of the present invention.

[0049] Figure 3This is a side view of the atomizing box in this invention (i.e., AA view).

[0050] Figure 4 This is a top view of the heated blower flue in this invention.

[0051] Figure 5 This is a diagram showing the connection structure of the top flue, the smoke inlet channel of the heating blower flue, and the atomizing box in this invention.

[0052] Figure 6 This is a diagram showing the connection structure of the top flue, the exhaust channel of the heated blower flue, and the atomizing box in this invention.

[0053] Figure 7 This is a flowchart from the present invention.

[0054] Figure 1 , Figure 2 , Figure 4 Arrow A1 indicates the direction of flue gas flow into the top flue; arrow A2 indicates the direction of flue gas flow out of the top flue.

[0055] exist Figure 3 Arrow A3 in the diagram indicates the direction of flue gas flow into the smoke inlet channel; A4 indicates the direction of flue gas flow out of the smoke outlet channel.

[0056] exist Figure 6 In the diagram, A5 represents the flow direction of the flue gas in the inlet channel; A6 represents the flow direction of the flue gas in the top flue; A7 represents the flow direction of the flue gas in the exhaust channel, as well as the flow direction of the flue gas entering the atomizing box structure through the exhaust grille to purge NaOH mist into the top flue; Q represents NaOH mist.

[0057] In the diagram: 1-Top flue, 2-Atomizing box, 2.1-Atomizing module, 2.2-Aerosol outlet guide plate, 2.3-Atomizing box observation window, 2.4-Absorbent inlet, 2.5-Overflow port, 2.6-Ventilation port, 2.7-Atomizing box body structure, 2.8-Atomizing box aerosol outlet, 3-Heating blower flue, 3A-Smoke inlet channel, 3B-Smoke exhaust channel, 3C-Smoke inlet area, 3D-Smoke outlet area, 3E- Smoke outlet grille, 3F-Grate rear guide plate, 3.1-First small flue, 3.2-Second small flue, 3.3-Third small flue, 3.4-Fourth small flue, 3.5-Fifth small flue, 3.6-Sixth small flue, 3.7-Seventh small flue, 3.8-Eighth small flue, 4-Gravity ash removal device, 4.1-Ash removal baffle, 4.2-Ash accumulation trough, 5-Atomizing box flue gas guide plate, 5.1-Rotating shaft. Detailed Implementation

[0058] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, these descriptions do not constitute a limitation of the present invention and are merely illustrative. The advantages of the present invention will become clearer and easier to understand through this description.

[0059] Referring to the attached diagram, a modular ultrasonic atomization method for flue gas desulfurization includes the following steps:

[0060] Step 1: The flue gas to be deacidified flows into the modular flue gas deacidification ultrasonic atomizing device from one side of the top flue duct 1 (e.g., Figure 1 , Figure 2 , Figure 4 As shown, Figure 1 , Figure 2 , Figure 4 Arrow A1 in the diagram indicates the direction of flue gas flow into the top flue. Part of the flue gas enters the heating blower flue 3 through the flue gas inlet area 3C, and part of the flue gas enters the downstream of the top flue 1.

[0061] Step 2: High-temperature flue gas enters from top to bottom through the first small flue 3.1, second small flue 3.2, third small flue 3.3, and fourth small flue 3.4 at the bottom of the atomizing box from the inlet area 3C. As the cross-section of the inlet area decreases, the flue gas velocity increases (the high-temperature flue gas velocity increases through the inlet area 3C and the outlet grille 3E, providing the kinetic energy to blow the atomized gas in the atomizing box to the top flue). The heated flue gas is then discharged through the fifth small flue 3.5, sixth small flue 3.6, seventh small flue 3.7, and eighth small flue 3.8 at the bottom of the atomizing box, using the heat of the flue gas itself to heat the NaOH solution in the atomizing box.

[0062] Step 3: The flue gas flowing out from the fifth small flue 3.5, the sixth small flue 3.6, or the seventh small flue 3.7 and the eighth small flue 3.8 passes through the ash removal baffle 4.1, which effectively intercepts the particulate matter entrained in the flue gas. The flue gas then flows out through the gap between the ash removal baffle 4.1 and the ash collection trough 4.2 and enters the smoke outlet area 3D upwards. The intercepted particulate matter is collected in the ash collection trough 4.2 and is periodically removed, effectively reducing the amount of particulate matter in the flue gas entering the atomizing box 2 and ensuring the atomization effect of the NaOH absorbent solution in the atomizing box.

[0063] Step 4: The flue gas entering the exhaust area 3D of the hot blower flue 3 is discharged through the exhaust grille 3E on the exhaust area 3D panel, further reducing the flow area and increasing the smoke velocity; under the directional guidance of the exhaust gas flow by the guide plate 3F behind the grille, the flue gas discharged from the exhaust grille 3E is blown into the atomizing box 2 at high speed.

[0064] Step 5: The flue gas discharged from the exhaust grille 3E blows the NaOH mist from the atomizing box 2 into the top flue 1 through the atomizing box mist outlet 2.8, where it undergoes a deacidification reaction with the flue gas in the top flue 1. The flue gas blown into the atomizing box 2 through the exhaust grille 3E heats the NaOH absorbent mist in the atomizing box, while also undergoing a partial deacidification reaction. The flue gas downstream in the top flue further heats the NaOH absorbent mist blown into the atomizing box mist outlet and completes the deacidification reaction, thus achieving a staged heating and staged deacidification effect.

[0065] Furthermore, in step one, the amount of flue gas entering the atomizing box for heating is changed by adjusting the rotating shaft 5.1 of the flue gas guide plate 5 at the inlet of the top flue 1.

[0066] Furthermore, in step five, the method for generating NaOH mist is as follows: NaOH solution is added through the absorbent inlet 2.4 of the atomizing box 2, heated by the high-temperature flue gas from the bottom heating blower duct 3 of the atomizing box 2, and generated into mist with a particle size of about 5-10 μm under the action of the ultrasonic atomizing module 2.1; under the blowing action of the high-speed flue gas at the flue outlet grille 3E, the NaOH mist flows into the top flue duct 1 along the mist outlet 2.8 of the atomizing box, and mixes with the flue gas to be deacidified to carry out the deacidification reaction.

[0067] Furthermore, in step five, when the NaOH solution level in the atomizing box structure 2.7 is lower than the optimal set value from the upper surface of the atomizing module 2.1, the NaOH solution is discharged from the overflow port 2.5 to maintain the stability of the absorbent NaOH level in the atomizing box structure 2.7 and ensure that the atomizing module 2.1 produces a stable amount of mist.

[0068] Furthermore, the atomization status and working status of the atomization module inside the atomization box 2 can be viewed through the atomization box observation window 2.3. At the same time, the atomization box observation window 2.3 can also serve as an inspection port when replacing the atomization module 2.1. When the atomization module 2.1 is being inspected or replaced, the corresponding atomization module can be removed and replaced through the atomization box observation window 2.3. When there are many impurities at the bottom of the atomization box structure 2.7 that need to be cleaned, the solution inside the atomization box 2 can be drained through the drain port 2.6 at the bottom.

[0069] Furthermore, the modular ultrasonic atomizing device for flue gas desulfurization includes a top flue 1, an atomizing box 2, a heated blower flue 3, and a gravity-type ash removal device 4.

[0070] The top flue 1 is located at the top of the atomizing box 2; by adjusting the rotating shaft of the heating flue gas guide plate in the top flue inlet, the amount of smoke entering the atomizing box for heating is changed;

[0071] The gravity-type ash removal device 4 is located inside the heated blast flue 3;

[0072] The heating blower flue 3 is located on the right side and bottom of the atomizing box 2; the heating blower flue 3 is connected to the top flue 1 and the atomizing box 2 respectively.

[0073] Furthermore, the atomizing box flue gas guide plate 5 is located inside the top flue 1 and installed at the connection between the top flue 1 and the smoke inlet area 3C. The flue gas to be deacidified flows in from one side of the top flue. Under the action of the atomizing box flue gas guide plate, part of the flue gas enters the heating blower flue of the atomizing box to heat the NaOH absorbent solution in the atomizing box. At the same time, the cooled flue gas increases in velocity through the smoke outlet grille, sending the NaOH absorbent mist from the atomizing box to the atomizing box mist outlet. The other part of the flue gas enters the downstream area through the top flue and mixes with the NaOH mist at the atomizing box mist outlet to carry out the deacidification reaction.

[0074] Furthermore, the atomizing box 2 includes an atomizing module 2.1, an aerosol outlet guide plate 2.2, an atomizing box observation window 2.3, an absorbent inlet 2.4, an overflow port 2.5, a vent port 2.6, an atomizing box body structure 2.7, and an atomizing box aerosol outlet 2.8;

[0075] The atomizing box has a hollow structure (2.7 mm).

[0076] The atomizing module 2.1 is located inside the atomizing box structure 2.7 and at the bottom of the atomizing box structure 2.7;

[0077] The atomizing box aerosol outlet 2.8 is located on the upper side of the atomizing box body structure 2.7 and downstream of the top flue 1;

[0078] The aerosol outlet guide plate 2.2 is installed at the aerosol outlet 2.8 of the atomizing box and is located inside the top flue 1;

[0079] The observation window 2.3 of the atomizing box is located on the side wall of the atomizing box structure 2.7;

[0080] The absorbent inlet 2.4 is installed on the side wall of the atomizing box structure 2.7 and is located above the atomizing module 2.1;

[0081] The overflow port 2.5 is located on the side wall of the atomizing box structure 2.7 and between the absorbent inlet 2.4 and the atomizing module 2.1;

[0082] The vent 2.6 is installed at the bottom of the atomizing box structure 2.7 and is located below the atomizing module 2.1.

[0083] The absorbent solution (i.e., NaOH solution) is added to the atomizing box through the absorbent inlet. It is heated by the high-temperature flue gas in the heated blower duct 3 at the bottom of the atomizing box and generated into an atomized mist with a particle size of about 5-10 μm under the action of the ultrasonic atomizing module. Under the blowing action of the high-speed flue gas at the flue outlet grille, the NaOH absorbent mist flows into the top flue through the atomized mist outlet guide plate at the top of the atomizing box, where it mixes with the flue gas to be deacidified to carry out the deacidification reaction.

[0084] To ensure good atomization effect of the atomization module, the absorbent solution should not submerge the upper surface of the atomization module too much. An overflow port is set on the side of the atomization box. When the absorbent liquid level in the atomization box is lower than the upper surface of the atomization module by more than the optimal set value, the absorbent solution is discharged from the overflow port. This design helps to stabilize the absorbent liquid level in the atomization box and ensures that the atomization module produces a stable amount of aerosol.

[0085] Furthermore, the heating blower flue 3 is located on the outside of the atomizing box structure 2.7, and on the right side and bottom of the atomizing box structure 2.7;

[0086] The heated air duct 3 includes a smoke inlet passage 3A and a smoke exhaust passage 3B; the smoke exhaust passage 3B is located on both sides of the smoke inlet passage 3A.

[0087] The smoke inlet channel 3A includes a first small smoke duct 3.1, a second small smoke duct 3.2, a third small smoke duct 3.3, and a fourth small smoke duct 3.4;

[0088] Smoke exhaust duct 3B includes the fifth small smoke duct 3.5, the sixth small smoke duct 3.6, the seventh small smoke duct 3.7, and the eighth small smoke duct 3.8;

[0089] The first small flue 3.1, the second small flue 3.2, the fifth small flue 3.5, and the sixth small flue 3.6 are all interconnected structures;

[0090] The third small flue 3.3 and the fourth small flue 3.4, the seventh small flue 3.7 and the eighth small flue 3.8 are all interconnected structures; the smoke exhaust channel 3B is provided with a smoke inlet area 3C and a smoke outlet area 3D;

[0091] The first small flue 3.1, the second small flue 3.2, the third small flue 3.3 and the fourth small flue 3.4 are all connected to the smoke inlet area 3C;

[0092] The fifth small flue 3.5, the sixth small flue 3.6, the seventh small flue 3.7 and the eighth small flue 3.8 are all connected to the smoke outlet area 3D;

[0093] A smoke outlet grille 3E is provided on the smoke outlet area 3D; the heating blower flue 3 is connected to the atomizing box body structure 2.7 through the smoke outlet grille 3E.

[0094] High-temperature flue gas enters from top to bottom through the first small flue 3.1, second small flue 3.2, third small flue 3.3, and fourth small flue 3.4 at the bottom, and is then exited through the fifth small flue 3.5, sixth small flue 3.6, seventh small flue 3.7, and eighth small flue 3.8 at the bottom. Utilizing the heat of the flue gas itself, the NaOH solution inside the atomizing box is heated without the need for dedicated electric heating equipment. In practical engineering, the temperature sensor inside the atomizing box can be interlocked with the rotating shaft transmission mechanism of the heating flue gas guide plate, automatically adjusting the amount of heating flue gas entering the atomizing box according to the temperature requirements of the absorbent solution.

[0095] As the cross-section of the exhaust area decreases, the velocity of the flue gas entering the atomizing box increases. The flue gas flowing out from the fifth small flue 3.5 and the sixth small flue 3.6 (or from the seventh small flue 3.7 and the eighth small flue 3.8) passes through the ash removal baffle and enters the exhaust area. After passing through the air outlet grille on the exhaust area panel, the flow area is further reduced, and the velocity of the flue gas increases further. Combined with the directional guiding effect of the guide plate behind the grille on the flue gas flow, the flue gas is blown into the atomizing box at high speed, forming a blower effect.

[0096] Furthermore, the gravity-type ash removal device 4 includes an ash removal baffle 4.1 and an ash collection trough 4.2;

[0097] The ash collection trough 4.2 is located inside the heating and blowing flue 3 and is connected to the exhaust flue 3B;

[0098] The dust removal baffle 4.1 is installed on the 3D wall of the smoke outlet area at one end and extends downward to the bottom plate of the dust accumulation trough 4.2 at the other end.

[0099] The flue gas flowing out from the small flues (5th small flue 3.5, 6th small flue 3.6, 7th small flue 3.7 and 8th small flue 3.8) effectively intercepts the particulate matter entrained in the flue gas through the ash removal baffle. The flue gas then flows out through the gap between the ash removal baffle and the ash collection trough and enters the smoke outlet area upward. The intercepted particulate matter collects in the ash collection trough and is periodically removed, which can effectively reduce the amount of particulate matter in the flue gas entering the atomization box and ensure the atomization effect of the absorbent solution in the atomization box.

[0100] All other unspecified parts belong to the prior art.

Claims

1. A modular ultrasonic atomization method for flue gas deacidification, characterized in that: The flue gas to be deacidified flows in from one side of the top flue (1) of the modular flue gas deacidification ultrasonic atomizing device. Under the action of the flue gas guide plate (5) of the atomizing box, part of the flue gas enters the heating blower flue (3) of the atomizing box (2) through the smoke inlet area (3C) to heat the NaOH solution in the atomizing box (2). At the same time, the flue gas after cooling increases its velocity after passing through the smoke outlet grille (3E), and sends the NaOH mist in the atomizing box (2) to the atomizing box mist outlet (2.8). The flue gas initially heats the NaOH mist in the atomizing box and performs a preliminary deacidification reaction. Another part of the flue gas enters the downstream area through the top flue (1) and mixes with the NaOH mist discharged from the atomizing box mist outlet (2.8) for further heating and deacidification reaction, so as to achieve the effect of graded heating and graded deacidification. The specific method includes the following steps: Step 1: The flue gas to be deacidified flows into the top flue (1) of the modular flue gas deacidification ultrasonic atomizing device from one side. Part of the flue gas enters the heating blower flue (3) through the flue gas inlet area (3C), and part of the flue gas enters the downstream of the top flue (1). Step 2: High-temperature flue gas enters from the smoke inlet area (3C) from top to bottom through the first small flue (3.1), second small flue (3.2), third small flue (3.3) and fourth small flue (3.4) at the bottom of the atomizing box (2). As the cross-section of the smoke inlet area decreases, the smoke velocity increases. The heated flue gas is discharged through the fifth small flue (3.5), sixth small flue (3.6), seventh small flue (3.7) and eighth small flue (3.8) at the bottom of the atomizing box. The heat of the flue gas itself is used to heat the NaOH solution in the atomizing box. Step 3: The flue gas flowing out from the fifth small flue (3.5), the sixth small flue (3.6) or the seventh small flue (3.7) and the eighth small flue (3.8) is effectively intercepted by the ash removal baffle (4.1). The flue gas flows out through the gap between the ash removal baffle (4.1) and the ash collection trough (4.2) and enters the smoke outlet area (3D) upward. The intercepted particles are collected in the ash collection trough (4.2), which effectively reduces the amount of particles in the flue gas entering the atomizing box (2) and ensures the atomization effect of the NaOH solution in the atomizing box. Step 4: The smoke entering the smoke outlet area (3D) is discharged through the smoke outlet grille (3E) on the smoke outlet area (3D) panel, further reducing the flow area and increasing the smoke velocity; under the directional guidance of the smoke flow by the guide plate (3F) behind the grille, the smoke discharged from the smoke outlet grille (3E) is blown into the atomizing box (2) at high speed. Step 5: The flue gas discharged from the exhaust grille (3E) blows the NaOH mist in the atomizing box (2) into the top flue (1) through the atomizing box mist outlet (2.8); the flue gas blown into the atomizing box (2) through the exhaust grille (3E) heats the NaOH mist in the atomizing box and performs a partial deacidification reaction at the same time; the flue gas downstream in the top flue further heats the NaOH mist blown into the atomizing box mist outlet and completes the deacidification reaction, thus achieving the effect of staged heating and staged deacidification.

2. The modular flue gas deacidification ultrasonic atomization method according to claim 1, characterized in that: In step one, the amount of flue gas entering the atomizing box for heating is changed by adjusting the rotating shaft (5.1) of the flue gas guide plate (5) at the inlet of the top flue (1).

3. The modular flue gas deacidification ultrasonic atomization method according to claim 1 or 2, characterized in that: In step five, the method for generating NaOH mist is as follows: The NaOH solution is added through the absorbent inlet (2.4) of the atomizing box (2), heated by the high-temperature flue gas from the heating duct (3) at the bottom of the atomizing box (2), and generated into aerosol with a particle size of 5 to 10 μm under the action of the ultrasonic atomizing module (2.1).

4. The modular flue gas deacidification ultrasonic atomization method according to claim 3, characterized in that: In step five, when the NaOH solution level in the atomizing box is lower than the optimal setting value from the upper surface of the atomizing module (2.1), the NaOH solution is discharged from the overflow port (2.5) to maintain the stability of the NaOH absorbent level in the atomizing box and ensure that the atomizing module (2.1) produces a stable amount of mist.

5. The modular flue gas deacidification ultrasonic atomization method according to claim 4, characterized in that: The atomization status and working status of the atomization module in the atomization box (2) can be viewed through the atomization box observation window (2.3); at the same time, the atomization box observation window (2.3) serves as the maintenance port when the atomization module (2.1) is replaced.

6. The modular flue gas deacidification ultrasonic atomization method according to claim 5, characterized in that: A modular ultrasonic atomizing device for flue gas desulfurization includes a top flue (1), an atomizing box (2), a heated blower flue (3), and a gravity ash removal device (4). The top flue (1) is located at the top of the atomizing box (2); The gravity-type ash removal device (4) is located inside the heated blast flue (3); The heating blower flue (3) is located on the right side and bottom of the atomizing box (2); the heating blower flue (3) is connected to the top flue (1) and the atomizing box (2) respectively.

7. The modular flue gas deacidification ultrasonic atomization method according to claim 6, characterized in that: The atomizing box flue (5) is located inside the top flue (1) and installed at the connection between the top flue (1) and the smoke inlet area (3C).

8. The modular flue gas deacidification ultrasonic atomization method according to claim 7, characterized in that: The atomizing box (2) includes an atomizing module (2.1), an aerosol outlet guide plate (2.2), an atomizing box observation window (2.3), an absorbent inlet (2.4), an overflow port (2.5), a vent (2.6), an atomizing box body structure (2.7), and an atomizing box aerosol outlet (2.8); The atomizing box has a hollow structure (2.7); The atomizing module (2.1) is located inside the atomizing box structure (2.7) and at the bottom of the atomizing box structure (2.7); The atomizing box aerosol outlet (2.8) is located on the upper side of the atomizing box body structure (2.7) and downstream of the top flue (1); The aerosol outlet guide plate (2.2) is installed at the aerosol outlet (2.8) of the atomizing box and is located in the top flue (1); The observation window (2.3) of the atomizing box is located on the side wall of the atomizing box structure (2.7); The absorbent inlet (2.4) is installed on the side wall of the atomizing box structure (2.7) and located above the atomizing module (2.1); The overflow port (2.5) is located on the side wall of the atomizing box structure (2.7) and between the absorbent inlet (2.4) and the atomizing module (2.1); The vent (2.6) is installed at the bottom of the atomizing box structure (2.7) and below the atomizing module (2.1).

9. The modular flue gas deacidification ultrasonic atomization method according to claim 8, characterized in that: The heating blower flue (3) is located on the outside of the atomizing box structure (2.7) and on the right side and bottom of the atomizing box structure (2.7); The heated air duct (3) includes an inlet duct (3A) and an exhaust duct (3B); the exhaust duct (3B) is located on both sides of the inlet duct (3A); The smoke inlet channel (3A) includes a first small smoke duct (3.1), a second small smoke duct (3.2), a third small smoke duct (3.3), and a fourth small smoke duct (3.4); the first small smoke duct (3.1), the second small smoke duct (3.2), the third small smoke duct (3.3), and the fourth small smoke duct (3.4) are all connected to the smoke inlet area (3C) on the heating blower flue (3); The smoke exhaust duct (3B) includes the fifth small smoke duct (3.5), the sixth small smoke duct (3.6), the seventh small smoke duct (3.7) and the eighth small smoke duct (3.8); the fifth small smoke duct (3.5), the sixth small smoke duct (3.6), the seventh small smoke duct (3.7) and the eighth small smoke duct (3.8) are all connected to the smoke outlet area (3D) on the heated blower flue (3); The first small flue (3.1), the second small flue (3.2), the fifth small flue (3.5), and the sixth small flue (3.6) are all interconnected structures; The third small flue (3.3) and the fourth small flue (3.4), the seventh small flue (3.7) and the eighth small flue (3.8) are all interconnected structures; A smoke outlet grille (3E) is provided on the smoke outlet area (3D); the heating blower flue (3) is connected to the atomizing box body structure (2.7) through the smoke outlet grille (3E).

10. The modular flue gas deacidification ultrasonic atomization method according to claim 9, characterized in that: The gravity-type ash removal device (4) includes an ash removal baffle (4.1) and an ash collection trough (4.2); The ash collection trough (4.2) is located inside the heating blower flue (3) and is connected to the exhaust flue (3B); The dust removal baffle (4.1) is installed on the wall of the smoke outlet area (3D) at one end and extends downward to the top of the bottom plate of the dust accumulation trough (4.2) at the other end.

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