Rotary spray type flue gas desulfurization treatment device and method

Abstract

The application provides a rotary spray type flue gas desulfurization treatment device and method. In the device, a flue gas distributor and a rotary spray atomizer are arranged at the top of a desulfurization tower, the rotary spray atomizer is connected with a liquid tank and used for atomizing a desulfurizing agent to form desulfurizing droplets; a gas collecting chamber is arranged in the desulfurization tower and located directly below the rotary spray atomizer; a cyclone device is used for converting the gas-liquid mixture in the gas collecting chamber into a cyclone state and circulating upward into the desulfurization tower. The gas-liquid mixture reaching the gas collecting chamber is circulated into the desulfurization tower in the cyclone state through the cooperation of the cyclone device and the gas collecting chamber, so that the flue gas distribution is more uniform, the flue gas residence time is longer, and the reaction is more efficient. In addition, the wet material wall sticking phenomenon is alleviated, and the running fouling in the tower is reduced.

Description

Technical Field

[0001] This invention belongs to the field of flue gas desulfurization technology, and particularly relates to a rotary spray flue gas desulfurization device and method. Background Technology

[0002] SO2 is one of the main gases that pollute the air. Its main harms include damaging plant leaves, reducing forest area, polluting water and soil, causing crop yield reduction or even death, and acidifying drinking groundwater.

[0003] SO2 primarily originates from three sources: the combustion of sulfur-containing fuels; the smelting of sulfur-containing ores; and emissions from industrial processes such as chemical plants, sulfuric acid plants, and power plants. Low-sulfur concentration flue gas from different SO2 sources includes FCC flue gas, ship flue gas, and coke oven flue gas. Coke oven flue gas has a more complex composition. Statistics show that SO2 concentrations in FCC regenerated flue gas... x The average content is around 800 ppm. Increased sulfur content in crude oil leads to higher SO2 concentrations in FCC regeneration flue gas. x The content also increases accordingly. The SO2 concentration in coke oven flue gas is 140–500 mg / Nm³. 3 SO2 readily reacts with NH3 to form NH4SO4, which can easily cause pipe blockage and equipment corrosion. Therefore, flue gas desulfurization treatment is necessary.

[0004] Based on the different phases involved in the process, flue gas desulfurization methods are generally classified into three categories: wet, dry, and semi-dry. Among them, the wet process has become very mature after many years of development and is currently the most widely used flue gas desulfurization method. Summary of the Invention

[0005] To enrich efficient desulfurization methods for application in more scenarios, this invention proposes a rotary spray flue gas desulfurization device and method.

[0006] In a first aspect, embodiments of the present invention provide a rotary spray flue gas desulfurization treatment device, comprising: a liquid tank, a rotary spray atomizer, a desulfurization tower, a flue gas distributor, a gas collection chamber, and a swirl device;

[0007] The flue gas distributor and the rotary spray atomizer are located at the top of the desulfurization tower. The rotary spray atomizer is connected to the liquid feed tank and is used to rotate and atomize the desulfurizing agent to form desulfurization droplets.

[0008] The gas collection chamber is located inside the desulfurization tower and directly below the rotary spray atomizer;

[0009] The swirling device is used to convert the gas-liquid mixture in the gas collecting chamber into a swirling state and circulate it upwards into the desulfurization tower.

[0010] In one or more alternative embodiments, the gas collection chamber opens upwards, and the upper cross-sectional area is larger than the lower cross-sectional area.

[0011] In one or more alternative embodiments, the swirling device includes a swirling inner column and a plurality of arc-shaped guide plates arranged around the swirling inner column;

[0012] The swirling inner column and the plurality of arc-shaped guide plates are placed in the gas collection chamber;

[0013] The swirling inner column is adapted to drive the multiple arc-shaped guide plates to rotate.

[0014] In one or more alternative embodiments, the swirling device further includes a drive motor connected to the inner swirling column to drive the inner swirling column and the plurality of arc-shaped guide plates to rotate.

[0015] In one or more alternative embodiments, the plurality of arc-shaped guide vanes are arranged obliquely around the swirling inner column.

[0016] In one or more alternative embodiments, the plurality of arc-shaped guide vanes are evenly arranged.

[0017] In one or more alternative embodiments, the arc-shaped guide vane has a helical curved surface.

[0018] The angle between the tangent at the bottom of the arc-shaped guide plate and the horizontal direction is 40° to 70°.

[0019] In one or more alternative embodiments, the swirling device further includes a support rod;

[0020] The support rod is fixed to the inner wall of the desulfurization tower, and the gas collection chamber is fixed to the support rod.

[0021] In one or more alternative embodiments, the rotation direction of the rotary spray atomizer is opposite to the swirling direction of the swirling device.

[0022] In one or more optional embodiments, the flue gas desulfurization treatment device further includes a peristaltic pump and a preheater;

[0023] The rotary spray atomizer is connected to the liquid tank via the peristaltic pump and the preheater.

[0024] The flue gas desulfurization treatment device described in the gas cyclone device also includes control valves;

[0025] The control valve is located between the peristaltic pump and the preheater.

[0026] In one or more optional embodiments, the bottom of the desulfurization tower is provided with a flue gas outlet and a waste liquid outlet.

[0027] In one or more optional embodiments, the flue gas desulfurization treatment device further includes a waste liquid collection device;

[0028] The waste liquid collection device is located below the waste liquid outlet.

[0029] In one or more optional embodiments, the flue gas desulfurization treatment device further includes a denitrification device;

[0030] The denitrification device is connected to the flue gas distributor.

[0031] In one or more optional embodiments, the flue gas desulfurization treatment device further includes a dust collector;

[0032] The dust collector is connected to the flue gas distributor.

[0033] In one or more optional embodiments, the flue gas desulfurization treatment device further includes a denitrification device and a dust collector;

[0034] The dust collector is located between the denitrification device and the flue gas distributor.

[0035] Secondly, embodiments of the present invention provide a flue gas desulfurization treatment method, using the flue gas desulfurization treatment device described in the first aspect above, comprising the following steps:

[0036] The flue gas is guided into the desulfurization tower after being guided by the flue gas distributor.

[0037] The desulfurizing agent in the feed tank is fed into a rotary spray atomizer to rotate and atomize into desulfurization droplets, which are then sent into the desulfurization tower to mix with the flue gas to form a gas-liquid mixture.

[0038] The gas-liquid mixture moving into the gas collection chamber is converted into a swirling state by the swirling device, and then flows upward into the desulfurization tower, where it mixes again with the desulfurization droplets to obtain purified flue gas.

[0039] In one or more optional embodiments, the method further includes:

[0040] The flow rates of the flue gas and the desulfurizing agent are controlled at 3000:1 to 10000:1.

[0041] Based on the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows:

[0042] The rotary spray flue gas desulfurization device provided in this invention utilizes a flue gas distributor and a rotary spray atomizer to react flue gas with desulfurization droplets, forming a gas-liquid mixture. This mixture, reaching the gas collection chamber, is converted from a flowing state to a swirling state by a swirling device, achieving flue gas redistribution. The swirling gas-liquid mixture then re-enters the desulfurization tower to mix again with the desulfurization droplets, optimizing the flue gas distribution within the tower, resulting in a more uniform distribution, extended residence time, improved gas-liquid mixing, and more efficient reaction, thus enhancing flue gas desulfurization efficiency. Furthermore, the swirling gas-liquid mixture alleviates the adhesion of wet materials to the walls, thereby reducing scaling during operation.

[0043] The rotary spray flue gas desulfurization device provided in this embodiment of the invention, by setting the gas collection chamber directly below the rotary spray atomizer in the desulfurization tower, can evenly distribute and stabilize the gas-liquid mixture in a swirling state formed by the rotation of the swirling device, and then uniformly recirculate it back into the desulfurization tower to ensure sufficient gas-liquid mixing, thereby improving the flue gas desulfurization efficiency. Attached Figure Description

[0044] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the structure of the rotary spray flue gas desulfurization treatment device provided in an embodiment of the present invention;

[0046] Figure 2 for Figure 1 A partial structural diagram of the cyclone device in the rotary spray flue gas desulfurization treatment device shown.

[0047] In the diagram, 1. Feed tank; 2. Peristaltic pump; 3. Control valve; 4. Preheater; 5. Rotary spray atomizer; 6. Desulfurization tower; 7. Flue gas distributor; 8. Gas collection chamber; 9. Swirl device; 10. Swirl inner column; 11. Arc-shaped guide plate; 12. Support rod; 13. Flue gas outlet; 14. Drive motor; 15. Waste liquid outlet; 16. Waste liquid collection device. Detailed Implementation

[0048] The inventors compared different existing desulfurization methods and found that wet desulfurization generally has higher efficiency, typically above 90%, but it suffers from problems such as high investment, high maintenance costs, susceptibility to equipment corrosion, significant scaling during operation, and large footprint, making it unsuitable for small and medium-sized enterprises. Dry processes have lower investment costs compared to wet processes, and the desulfurization products are dry, making the equipment less susceptible to corrosion, scaling, and clogging. However, dry processes have low desulfurization efficiency and a slow reaction rate. Semi-dry processes involve the desulfurizing agent entering the desulfurization tower in a dry state for desulfurization and then reusing it in a wet state, or the desulfurizing agent entering the desulfurization tower in a wet state for desulfurization. Both methods produce dry flue gas desulfurization products and offer advantages such as simple equipment, low investment, and low technical requirements. However, semi-dry processes have more limitations. Furthermore, the inventors discovered that existing desulfurization treatment devices, such as desulfurization towers, suffer from poor gas-liquid mass transfer, uneven flue gas distribution, and insufficient gas-liquid mixing when treating low-sulfur concentration flue gas, resulting in low desulfurization efficiency and easy scaling on the inner walls of the equipment. Spray towers, on the other hand, can only spray at a fixed angle with a small spray range, leading to poor gas-liquid mixing and a relatively low removal rate. Therefore, the inventors conducted further research and development, resulting in this invention.

[0049] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0050] This invention provides a rotary spray flue gas desulfurization treatment device, referring to... Figure 1 and Figure 2 As shown, the flue gas desulfurization treatment device includes: a feed tank 1, a rotary spray atomizer 5, a desulfurization tower 6, a flue gas distributor 7, a gas collection chamber 8, and a cyclone device 9;

[0051] The flue gas distributor 7 and the rotary spray atomizer 5 are located at the top of the desulfurization tower 6. The rotary spray atomizer 5 is connected to the liquid tank 1 and is used to rotate and atomize the desulfurizing agent to form desulfurization droplets.

[0052] The gas collection chamber 8 is located inside the desulfurization tower 6 and directly below the rotary spray atomizer 5;

[0053] The swirling device 9 is used to convert the gas-liquid mixture in the gas collecting chamber 8 into a swirling state and circulate it upwards into the desulfurization tower 6.

[0054] In one embodiment, reference is made to Figure 1 As shown, the swirling device 9 includes a swirling inner column 10 and a plurality of arc-shaped guide plates 11 arranged around the swirling inner column 10;

[0055] The swirling inner column 10 and the plurality of arc-shaped guide plates 11 are placed inside the gas collection chamber 8;

[0056] The swirling inner column 10 is adapted to drive the plurality of arc-shaped guide plates 11 to rotate.

[0057] In one specific embodiment, reference is made to Figure 1 As shown, the swirling device also includes a drive motor 14, which is connected to the inner swirling column 10 to drive the inner swirling column 10 and the plurality of arc-shaped guide plates 11 to rotate.

[0058] In one specific embodiment, reference is made to Figure 1 As shown, the air collecting chamber 8 opens upwards, and its upper cross-sectional area is larger than its lower cross-sectional area. More specifically, the air collecting chamber 8 can be shaped like a funnel with its opening facing upwards.

[0059] In one specific embodiment, the flue gas desulfurization treatment device further includes a peristaltic pump 2 and a preheater 4; the rotary spray atomizer 5 is connected to the feed tank 1 via the peristaltic pump 2 and the preheater 4. The prepared desulfurizing agent is heated by the preheater 4 after being fed into the feed tank 1, and then enters the rotary spray atomizer 5 via the peristaltic pump 2. The desulfurizing agent rotates in the rotary spray atomizer 5 to form desulfurization droplets. Before the desulfurizing agent in the feed tank 1 is fed into the rotary spray atomizer 5, the desulfurizing agent is preheated using the preheater 4. The preheater 4 has a heating range of 40–80°C, preferably 50–60°C.

[0060] To facilitate control of the desulfurizing agent introduced into the rotary spray atomizer 5, the flue gas desulfurization treatment device may also include a control valve 3; the control valve 3 is located between the peristaltic pump 2 and the preheater 4, and the desulfurizing agent is introduced into the rotary spray atomizer 5 by opening the control valve 3, and the flow rate can also be controlled by adjusting the opening degree of the control valve 3.

[0061] The flue gas to be purified enters the flue gas distributor 7 from the flue duct, forming multiple streams of flue gas with the same velocity but different directions. These multiple streams of flue gas flow concurrently into the desulfurization tower 6, where they mix with the desulfurization droplets, allowing the droplets to fully contact and react with the flue gas, thus achieving primary flue gas desulfurization. The gas-liquid mixture after primary flue gas desulfurization enters the gas collection chamber 8. The rotation of the swirl device 9 in the gas collection chamber 8 causes the gas-liquid mixture to form a swirling state. After the gas-liquid mixture is evenly and stably distributed in the gas collection chamber 8, it is recirculated into the desulfurization tower 6 under stable wind speed and dynamic pressure conditions, achieving flue gas redistribution. Here, it again fully contacts and reacts with the desulfurization droplets sprayed by the rotating spray atomizer 5, achieving secondary flue gas desulfurization.

[0062] like Figure 1The direction of the middle arrow indicates the movement direction of the flue gas and the gas-liquid mixture during the flue gas desulfurization process. As can be seen from the figure, after the flue gas undergoes the first flue gas desulfurization treatment, a gas-liquid mixture is formed. The gas-liquid mixture moves to the gas collection chamber 8 and then recirculates into the desulfurization tower 6, realizing the secondary flue gas desulfurization treatment. This extends the flue gas residence time, makes the gas-liquid mixture more thorough, and can greatly improve the desulfurization efficiency.

[0063] Reference Figure 1 As shown, in this flue gas desulfurization treatment device, the bottom of the desulfurization tower 6 is provided with a flue gas outlet 13 and a waste liquid outlet 15, and a waste liquid collection device 16 is provided below the waste liquid outlet 15. During the operation of the flue gas desulfurization treatment device, the desulfurization droplets that absorb sulfur components in the flue gas enter the waste liquid collection device 16 below from the waste liquid outlet 15 under the action of gravity, while the purified flue gas is discharged through the flue gas outlet 15.

[0064] In this embodiment of the invention, the specific implementation of the flue gas distributor 7 can be described in detail in the prior art. For example, the flue gas distributor 7 may include a volute flue, with a ring-shaped slit outlet at the bottom of the inner side of the volute flue; a conical diffuser is installed at the lower part of the volute flue, with the air inlet at the top of the conical diffuser connected to the ring-shaped slit outlet on the inner side of the volute flue; several hydraulic jacks are installed on the outer side of the inner wall of the volute flue, with the bottom of the hydraulic jacks connected and fixed to the top of the conical diffuser, and the several hydraulic jacks are installed above the ring-shaped slit outlet; a ring of flue gas baffles that can move up and down is installed inside the volute flue near the ring-shaped slit outlet; the top of the hydraulic jacks is connected to the bottom of the top plate; a moving groove is vertically provided on one side of the hydraulic jacks on the inner wall of the volute flue, and one side of the top plate is connected to the top of the flue gas baffle through a connecting rod, the connecting rod passing through the moving groove. Several arc-shaped guide vanes are installed at the bottom of the volute flue. These vanes are evenly distributed counterclockwise along the circumference of the circumference of the volute flue's inner annular seam outlet, consistent with the direction of flue gas flow. The length of the arc-shaped guide vanes gradually decreases from the inlet of the volute flue to the other end, following the same decreasing trend as the volute flue itself. These arc-shaped guide vanes form several arc-shaped flow channels inside the volute flue. When the flue gas passes through the flue gas distributor 7, under the action of the arc-shaped guide vanes in the volute flue, multiple streams of flue gas with the same velocity but different directions are formed.

[0065] In this embodiment of the invention, the rotary spray atomizer 5 can be equipped with multiple atomizing nozzles. The high-speed rotation of these nozzles disperses the desulfurizing agent into desulfurization droplets of 30-80 micrometers, allowing the fine droplets to fully mix with the flue gas and achieve efficient desulfurization. Furthermore, the rotational speed of the rotary spray atomizer can be 30,000-40,000 r / min, preferably 34,000-36,000 r / min, thereby obtaining a larger specific surface area during rotation and improving desulfurization efficiency. The specific implementation of the rotary spray atomizer 5 can be found in the detailed descriptions in the prior art, and will not be repeated here.

[0066] The rotary spray flue gas desulfurization device provided in this embodiment of the invention, by setting a gas collection chamber and a swirl device 9 inside the desulfurization tower 6, enables more thorough gas-liquid mixing and improves desulfurization efficiency. Specifically, referring to... Figure 2 As shown, in the cyclone device 9, multiple inclined arc-shaped guide plates 11 are arranged around the inner cyclone column 10. The inner cyclone column 10 is externally connected to a drive motor 14. When the flue gas desulfurization treatment device is working, the drive motor 14 drives the inner cyclone column 10 and the multiple arc-shaped guide plates 11 to rotate, guiding the flue gas through the arc-shaped guide plates 11, so that the flue gas can be evenly distributed in the desulfurization tower 6. The upper part of the cyclone device 9 is connected to the gas collecting chamber 8, which is shaped like an upward-opening trumpet, and the inner diameter gradually increases from bottom to top. It is fixed in the desulfurization tower 6 by a support rod 12. Specifically, the support rod 12 is fixed to the inner wall of the desulfurization tower 6, and the gas collecting chamber 8 is fixed to the support rod 12.

[0067] Furthermore, to achieve uniform airflow distribution, the multiple arc-shaped guide vanes 11 can be evenly arranged around the swirling inner column 10. (Refer to...) Figure 1 As shown, the arc-shaped guide vane 11 can be in the form of a helical curved surface. More specifically, refer to... Figure 2 As shown, the angle α between the tangent direction at the bottom of the arc-shaped guide plate 11 and the horizontal direction is 40° to 70°. In the actual implementation process, the angle α can be finely adjusted according to actual needs, and the preferred angle is 55° to 65°.

[0068] In one specific embodiment, the rotation direction of the rotary spray atomizer 5 is opposite to the swirl direction of the swirling device 9. In this embodiment, the rotation direction of the rotary spray atomizer 5 is opposite to the swirl direction of the plurality of arc-shaped guide plates 11. Since the rotation direction of the rotary spray atomizer 5 is opposite to the swirl direction of the arc-shaped guide plates 11, the movement direction of the spray droplets and the circulating gas-liquid mixture is opposite, increasing the contact time between the two, ensuring thorough gas-liquid mixing, and improving desulfurization efficiency.

[0069] In this embodiment of the invention, in order to better improve the desulfurization efficiency, the amount of flue gas to be purified and the desulfurizing agent introduced into the desulfurization tower 6 can also be controlled. For example, a flow monitoring device can be set up to monitor the flow rate of the flue gas to be purified and the desulfurizing agent respectively. Based on the monitoring value returned by the flow monitoring device, the flow rate of the flue gas to be purified and the desulfurizing agent can be adjusted to control the flow rate of the flue gas to the desulfurizing agent to be between 3000:1 and 10000:1, preferably between 6500:1 and 8000:1.

[0070] In one specific embodiment, the flue gas desulfurization treatment device may further include a denitrification device (not shown in the figure) and a dust collector (not shown in the figure);

[0071] The dust collector is located between the denitrification device and the flue gas distributor.

[0072] Before entering the flue gas distributor, the flue gas can be pretreated by a denitrification device and a dust collector. Of course, in some other embodiments, if the flue gas to be purified does not contain NO... x or NO x If the content is extremely low, the flue gas desulfurization treatment device may not need a denitrification device, and the dust collector can be directly connected to the flue gas distributor 7. If the flue gas to be purified contains no dust or particulate matter, or the content of dust and particulate matter is extremely low, the flue gas desulfurization treatment device may not include a dust collector, and the denitrification device can be directly connected to the flue gas distributor 7. In this embodiment of the invention, the dust particles discharged from the dust collector can be sent to an ash silo for recycling.

[0073] The rotary spray flue gas desulfurization device provided in this embodiment of the invention can perform flue gas desulfurization treatment according to the following steps:

[0074] The flue gas to be purified is pretreated by a denitrification device and a dust collector to obtain pretreated flue gas.

[0075] The pretreated flue gas is guided by the flue gas distributor 7 to form multiple flue gas streams with the same speed but different directions, which are then sent into the desulfurization tower 6.

[0076] After the desulfurizing agent in the liquid silo 1 is heated by the preheater 4, it enters the rotary spray atomizer 5 through the peristaltic pump 2, so that the desulfurizing agent is rotated and atomized to form desulfurization droplets, which are sent into the desulfurization tower 6, so that the desulfurization droplets and flue gas are mixed in the desulfurization tower 6 to form a gas-liquid mixture.

[0077] After the gas-liquid mixture moving into the gas collection chamber 8 rotates through multiple arc-shaped guide plates 11 of the swirling device 9 to form a swirling state, and after the flue gas is evenly and stably distributed in the gas collection chamber, it is circulated upward into the desulfurization tower 6, where it mixes again with the desulfurization droplets to obtain purified flue gas.

[0078] After absorbing sulfur components, the desulfurization droplets enter the waste liquid collection device 16, waiting for further treatment, while the purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower.

[0079] The rotary spray flue gas desulfurization device provided in this invention utilizes a flue gas distributor and a rotary spray atomizer to react flue gas with desulfurization droplets, forming a gas-liquid mixture. This mixture, reaching the gas collection chamber, is converted from a flowing state to a swirling state by a swirling device, achieving flue gas redistribution. The swirling gas-liquid mixture then re-enters the desulfurization tower to mix again with the desulfurization droplets, optimizing the flue gas distribution within the tower, resulting in a more uniform distribution, extended residence time, improved gas-liquid mixing, and more efficient reaction, thus enhancing flue gas desulfurization efficiency. Furthermore, the swirling gas-liquid mixture alleviates the adhesion of wet materials to the walls, thereby reducing scaling during operation.

[0080] The rotary spray flue gas desulfurization device provided in this embodiment of the invention, by setting the gas collection chamber directly below the rotary spray atomizer in the desulfurization tower, can evenly distribute and stabilize the gas-liquid mixture in a swirling state formed by the rotation of the swirling device, and then uniformly recirculate it back into the desulfurization tower to ensure sufficient gas-liquid mixing, thereby improving the flue gas desulfurization efficiency.

[0081] Based on the same inventive concept, embodiments of the present invention also provide a flue gas desulfurization treatment method, using the above-mentioned rotary spray flue gas desulfurization treatment device, including the following steps:

[0082] The flue gas is guided into the desulfurization tower 6 after passing through the flue gas distributor 7.

[0083] The desulfurizing agent in the liquid tank 1 is fed into the rotary spray atomizer 5 and atomized to form desulfurization droplets, which are then sent into the desulfurization tower 6 to mix with the flue gas in the desulfurization tower 6 to form a gas-liquid mixture.

[0084] The gas-liquid mixture moving into the gas collection chamber 8 is converted into a swirling state by the swirling device 9, and then flows upward into the desulfurization tower 6, where it mixes again with the desulfurization droplets to obtain purified flue gas.

[0085] In an optional embodiment, the method further includes:

[0086] The flow rates of the flue gas and the desulfurizing agent are controlled at 3000:1 to 10000:1, preferably 6500:1 to 8000:1.

[0087] In an optional embodiment, the method further includes preheating the desulfurizing agent in the feed tank 1 using a preheater 4 before introducing the desulfurizing agent into the rotary spray atomizer 5. The preheater 4 has a heating range of 40–80°C, preferably 50–60°C.

[0088] To provide a clearer explanation of the rotary spray flue gas desulfurization device and desulfurization method provided in the embodiments of the present invention, several specific embodiments are described below, and the effectiveness of the rotary spray flue gas desulfurization device provided in the embodiments of the present invention is verified:

[0089] Example 1

[0090] The rotary spray flue gas desulfurization treatment device of Embodiment 1 of the present invention has a rotary spray atomizer 5 with a rotation speed of 35,000 rpm, and the angle α between the bottom tangent direction of the arc-shaped guide plate 11 and the horizontal direction is 55°. The rotary spray atomizer 5 rotates in a clockwise direction, while the swirl device 9 rotates in a counterclockwise direction.

[0091] The desulfurizing agent selected is a calcium-based desulfurizing agent with a Ca(OH)2 content of 20wt%.

[0092] The simulated flue gas composition (volume) processed was: SO2: 156 mg / Nm³ 3 CO2: 1115 mg / Nm 3 ; O2: 14.5%; H2O: 12.2%, CO: 1.05%; NO x 0.5%, with an organic sulfur compound (COS) content of 70 mg / Nm³. 3 The rest is nitrogen.

[0093] The reaction temperature is 50℃.

[0094] The steps for treating flue gas using the above-mentioned device are as follows:

[0095] (1) Flue gas pretreatment: Flue gas is pretreated at a rate of 2×10 4 m 3 The flow rate of / h is first processed by the denitrification device, and then the dust is removed by the dust collector. The pretreated flue gas is then sent to the flue gas distributor 7. The pretreated flue gas is guided through the flue gas distributor 7 to form multiple flue gas streams with the same speed but different directions, which are then sent into the desulfurization tower 6.

[0096] (2) Gas-liquid mixing and atomization: Open valve 3 to allow the prepared desulfurizing agent to atomize at a rate of 3m. 3 The flow rate of the liquid is fed into the preheater 4 through the liquid tank 1 and heated to 50°C. Then, it enters the rotary spray atomizer 5 through the peristaltic pump 2. The desulfurizing agent is rotated and atomized in the rotary spray atomizer 5 to form desulfurization droplets, which are mixed with the flue gas after being guided by the flue gas distributor 7 to form a gas-liquid mixture.

[0097] (3) Flue gas redistribution: The gas-liquid mixture reaches the gas collection chamber 8 and is rotated by the swirl device 9 to form a swirling state. After the flue gas is evenly and stably distributed in the gas collection chamber 8, it is circulated upward into the desulfurization tower 6 and mixed again with the desulfurization droplets to obtain purified flue gas.

[0098] (4) Desulfurization agent treatment and purified flue gas emission: After absorbing sulfur components, the desulfurization droplets enter the waste liquid collection device 16, awaiting further treatment. The purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower 6. The emitted gas is detected by a flue gas analyzer, and the residual SO2 concentration is 3 mg / m³. 3 The desulfurization efficiency reached 98.08%, and the scale buildup during operation was 0.5g.

[0099] Example 2

[0100] The high-efficiency rotary spray flue gas desulfurization tower of Embodiment 2 of the present invention has a rotary spray atomizer 5 at the top of the tower with a rotation speed of 34,000 rpm, and the angle α between the bottom tangent of the arc-shaped guide plate 11 and the horizontal direction is 65°. The rotary spray atomizer 5 rotates in a clockwise direction, and the swirl device 9 rotates in a counterclockwise direction.

[0101] The desulfurizing agent selected is a calcium-based desulfurizing agent with a Ca(OH)2 content of 20wt%.

[0102] The simulated flue gas composition (volume) processed was: SO2: 256 mg / Nm³ 3 CO2: 1115 mg / Nm 3 ; O2: 16.7%; H2O: 12.2%, CO: 1.05%; NO x 0.5%, with an organic sulfur compound (COS) content of 70 mg / Nm³. 3 The rest is nitrogen.

[0103] The reaction temperature is 60℃.

[0104] The steps for treating flue gas using the above-mentioned device are as follows:

[0105] (1) Flue gas at 4×10 4 m 3 The flow rate of / h is first processed by the denitrification device, and then the dust is removed by the dust collector. The pretreated flue gas is then sent to the flue gas distributor 7. The pretreated flue gas is guided through the flue gas distributor 7 to form multiple flue gas streams with the same speed but different directions, which are then sent into the desulfurization tower 6.

[0106] (2) Gas-liquid mixing and atomization: Open valve 3 to allow the prepared desulfurizing agent to atomize at a rate of 5m. 3 The flow rate of the liquid is fed into the preheater 4 through the liquid tank 1 and heated to 60°C. Then, it enters the rotary spray atomizer 5 through the peristaltic pump 2. The desulfurizing agent is rotated and atomized in the rotary spray atomizer 5 to form desulfurization droplets, which are mixed with the flue gas after being guided by the flue gas distributor 7 to form a gas-liquid mixture.

[0107] (3) Flue gas redistribution: The gas-liquid mixture reaches the gas collection chamber 8 and is rotated by the swirl device 9 to form a swirling state. After the flue gas is evenly and stably distributed in the gas collection chamber 8, it is circulated upward into the desulfurization tower 6 and mixed again with the desulfurization droplets to obtain purified flue gas.

[0108] (4) Desulfurization agent treatment and purified flue gas emission: After absorbing sulfur components, the desulfurization droplets enter the waste liquid collection device 16, awaiting further treatment. The purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower 6. The emitted gas is detected by a flue gas analyzer, and the residual SO2 concentration is 5 mg / m³. 3 The desulfurization efficiency reached 98.05%, and the scale buildup during operation was 0.8g.

[0109] Example 3

[0110] The high-efficiency rotary spray flue gas desulfurization tower of Embodiment 3 of the present invention has a rotary spray atomizer 5 at the top of the tower with a rotation speed of 36,000 rpm, and the angle α between the bottom tangent of the arc-shaped guide plate 11 and the horizontal direction is 60°. The rotary spray atomizer 5 rotates in a clockwise direction, and the swirl device 9 rotates in a counterclockwise direction.

[0111] The desulfurizing agent selected is a calcium-based desulfurizing agent with a Ca(OH)2 content of 20wt%.

[0112] The simulated flue gas composition (volume) processed was: SO2: 130 mg / Nm³ 3 CO2: 1110 mg / Nm 3 ; O2: 13.7%; H2O: 12.2%, CO: 1.05%; NO x 0.5%, with an organic sulfur compound (COS) content of 70 mg / Nm³. 3 The rest is nitrogen.

[0113] The reaction temperature is 55℃.

[0114] The steps for treating flue gas using the above-mentioned device are as follows:

[0115] (1) The flue gas is at a rate of 1.5 × 10 4 m 3 The flow rate of / h is first processed by the denitrification device, and then the dust is removed by the dust collector. The pretreated flue gas is then sent to the flue gas distributor 7. The pretreated flue gas is guided through the flue gas distributor 7 to form multiple flue gas streams with the same speed but different directions, which are then sent into the desulfurization tower 6.

[0116] (2) Gas-liquid mixing and atomization: Open valve 3 to allow the prepared desulfurizing agent to flow at a rate of 3.5m. 3The flow rate of the liquid is fed into the preheater 4 through the liquid tank 1 and heated to 55°C. Then, it enters the rotary spray atomizer 5 through the peristaltic pump 2. The desulfurizing agent is rotated and atomized in the rotary spray atomizer 5 to form desulfurization droplets, which are mixed with the flue gas after being guided by the flue gas distributor 7 to form a gas-liquid mixture.

[0117] (3) Flue gas redistribution: The gas-liquid mixture reaches the gas collection chamber 8 and is rotated by the swirl device 9 to form a swirling state. After the flue gas is evenly and stably distributed in the gas collection chamber 8, it is circulated upward into the desulfurization tower 6 and mixed again with the desulfurization droplets to obtain purified flue gas.

[0118] (4) Desulfurization agent treatment and purified flue gas emission: After absorbing sulfur components, the desulfurization droplets enter the waste liquid collection device 16, awaiting further treatment. The purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower 6. The emitted gas is detected by a flue gas analyzer, and the residual SO2 concentration is 2 mg / m³. 3 The desulfurization efficiency reached 98.46%, and the scale buildup during operation was 0.5g.

[0119] Example 4

[0120] The high-efficiency rotary spray flue gas desulfurization tower of Embodiment 4 of the present invention has a rotary spray atomizer 5 at the top of the tower with a rotation speed of 36,000 rpm, and the angle α between the bottom tangent of the arc-shaped guide plate 11 and the horizontal direction is 60°. The rotary spray atomizer 5 rotates counterclockwise, and the swirl device 9 rotates clockwise.

[0121] The desulfurizing agent selected is a calcium-based desulfurizing agent with a Ca(OH)2 content of 20wt%.

[0122] The simulated flue gas composition (volume) processed was: SO2: 208 mg / Nm³ 3 CO2: 1115 mg / Nm 3 ; O2: 16.7%; H2O: 12.2%, CO: 1.05%; NO x 0.5%, with an organic sulfur compound (COS) content of 70 mg / Nm³. 3 The rest is nitrogen.

[0123] The reaction temperature is 55℃.

[0124] The steps for treating flue gas using the above-mentioned device are as follows:

[0125] (1) Flue gas at 3×10 4 m 3 The flow rate of / h is first processed by the denitrification device, and then the dust is removed by the dust collector. The pretreated flue gas is then sent to the flue gas distributor 7. The pretreated flue gas is guided through the flue gas distributor 7 to form multiple flue gas streams with the same speed but different directions, which are then sent into the desulfurization tower 6.

[0126] (2) Gas-liquid mixing and atomization: Open valve 3 to allow the prepared desulfurizing agent to mix at a rate of 4.5 m³ / min. 3 The flow rate of the liquid is fed into the preheater 4 through the liquid tank 1 and heated to 55°C. Then, it enters the rotary spray atomizer 5 through the peristaltic pump 2. The desulfurizing agent is rotated and atomized in the rotary spray atomizer 5 to form desulfurization droplets, which are mixed with the flue gas after being guided by the flue gas distributor 7 to form a gas-liquid mixture.

[0127] (3) Flue gas redistribution: The gas-liquid mixture reaches the gas collection chamber 8 and is rotated by the swirl device 9 to form a swirling state. After the flue gas is evenly and stably distributed in the gas collection chamber 8, it is circulated upward into the desulfurization tower 6 and mixed again with the desulfurization droplets to obtain purified flue gas.

[0128] (4) Desulfurization agent treatment and purified flue gas emission: After absorbing sulfur components, the desulfurization droplets enter the waste liquid collection device 16, awaiting further treatment. The purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower 6. The emitted gas is detected by a flue gas analyzer, and the residual SO2 concentration is 4 mg / m³. 3 The desulfurization efficiency reached 98.08%, and the scale buildup during operation was 0.8g.

[0129] Example 5

[0130] The high-efficiency rotary spray flue gas desulfurization tower of Embodiment 5 of the present invention has a rotary spray atomizer 5 at the top of the tower with a rotation speed of 34,000 rpm, and the angle α between the bottom tangent of the arc-shaped guide plate 11 and the horizontal direction is 60°. The rotary spray atomizer 5 rotates counterclockwise, and the swirl device 9 rotates clockwise.

[0131] The desulfurizing agent selected is a calcium-based desulfurizing agent with a Ca(OH)2 content of 20wt%.

[0132] The simulated flue gas composition (volume) processed was: SO2: 168 mg / Nm³ 3 CO2: 1110 mg / Nm 3 ; O2: 13.2%; H2O: 14.2%, CO: 1.05%; NO x 0.5%, with an organic sulfur compound (COS) content of 70 mg / Nm³. 3 The remainder is nitrogen. The reaction temperature is 55℃.

[0133] The steps for treating flue gas using the above-mentioned device are as follows:

[0134] (1) Flue gas at 3.5×10 4 m 3The flow rate of / h is first processed by the denitrification device, and then the dust is removed by the dust collector. The pretreated flue gas is then sent to the flue gas distributor 7. The pretreated flue gas is guided through the flue gas distributor 7 to form multiple flue gas streams with the same speed but different directions, which are then sent into the desulfurization tower 6.

[0135] (2) Gas-liquid mixing and atomization: Open valve 3 to allow the prepared desulfurizing agent to mix at a rate of 4.5 m³ / min. 3 The flow rate of the liquid is fed into the preheater 4 through the liquid tank 1 and heated to 55°C. Then, it enters the rotary spray atomizer 5 through the peristaltic pump 2. The desulfurizing agent is rotated and atomized in the rotary spray atomizer 5 to form desulfurization droplets, which are mixed with the flue gas after being guided by the flue gas distributor 7 to form a gas-liquid mixture.

[0136] (3) Flue gas redistribution: The gas-liquid mixture reaches the gas collection chamber 8 and is rotated by the swirl device 9 to form a swirling state. After the flue gas is evenly and stably distributed in the gas collection chamber 8, it is circulated upward into the desulfurization tower 6 and mixed again with the desulfurization droplets to obtain purified flue gas.

[0137] (4) Desulfurization agent treatment and purified flue gas emission: After absorbing sulfur components, the desulfurization droplets enter the waste liquid collection device 16, awaiting further treatment. The purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower 6. The emitted gas is detected by a flue gas analyzer, and the residual SO2 concentration is 5 mg / m³. 3 The desulfurization efficiency reached 97.02%, and the scale buildup during operation was 0.9g.

[0138] Comparative Example 1

[0139] Comparative Example 1 uses a conventional rotary spray desulfurization tower, as described in patent CN103446873A, for flue gas desulfurization. The composition (volume) of the simulated flue gas treated is: SO2: 130 mg / Nm³. 3 CO2: 1110 mg / Nm 3 ; O2: 13.7%; H2O: 12.2%, CO: 1.05%; NO x 0.5%, with an organic sulfur compound (COS) content of 70 mg / Nm³. 3 The rest is nitrogen.

[0140] The desulfurizing agent selected is a calcium-based desulfurizing agent with a Ca(OH)2 content of 20wt%.

[0141] The reaction temperature is 55℃.

[0142] The steps for treating simulated flue gas using a traditional rotary spray desulfurization tower are as follows:

[0143] (1) The flue gas is at a rate of 1.5 × 10 4 m 3The flow rate of / h is processed by the denitrification device, then dusted by the dust collector, and then sent to the rotary spray desulfurization tower and into the flue gas distributor.

[0144] (2) Gas-liquid mixing and atomization: The prepared desulfurizing agent is atomized at 3.5m 3 The flow rate of the liquid is fed into the preheater through the feed tank and heated to 55°C. Then, it enters the rotary spray atomizer through the peristaltic pump at the top of the rotary spray desulfurization tower. The desulfurizing agent rotates in the rotary spray atomizer at the top of the traditional rotary spray desulfurization tower to form droplets, which mix with the flue gas.

[0145] (3) Desulfurizing agent treatment and purified flue gas emission: The absorbed desulfurizing agent enters the collection chamber at the lower outlet for further treatment. The purified flue gas is discharged through the flue gas outlet at the bottom of the desulfurization tower. The emitted gas is detected by a flue gas analyzer, and the residual SO2 concentration is 24 mg / m³. 3 The desulfurization efficiency was 81.54%, and the scale buildup during operation was 23.9g.

[0146] Comparative Example 2

[0147] Comparative Example 2 uses a spray tower, as described in CN111701436A, for flue gas desulfurization. The composition (volume) of the simulated flue gas treated is: SO2: 130 mg / Nm³. 3 CO2: 1110 mg / Nm 3 ; O2: 13.7%; H2O: 12.2%, CO: 1.05%; NO x 0.5%, with an organic sulfur compound (COS) content of 70 mg / Nm³. 3 The rest is nitrogen.

[0148] The desulfurizing agent selected is a calcium-based desulfurizing agent with a Ca(OH)2 content of 20wt%.

[0149] The reaction temperature is 55℃.

[0150] The steps for treating simulated flue gas using a spray tower device are as follows:

[0151] (1) The flue gas is at a rate of 1.5 × 10 4 m 3 The flow rate of / h is processed by the denitrification device, then dusted by the dust collector, and then sent to the spray tower.

[0152] (2) Gas-liquid mixing and atomization: The prepared desulfurizing agent is atomized at 3.5m 3 The flow rate of the liquid is fed into the preheater through the feed tank and heated to 55°C before entering the spray tower to mix with the flue gas.

[0153] (3) Desulfurizing agent treatment and purified flue gas emission: The absorbed desulfurizing agent enters the collection chamber at the lower outlet for further treatment. The purified flue gas is discharged through the flue gas outlet at the bottom of the desulfurization tower. The emitted gas is detected by a flue gas analyzer, and the residual SO2 concentration is 19 mg / m³. 3 The desulfurization efficiency was 85.38%, and the scale buildup during operation was 15.7g.

[0154] Table 1

[0155]

[0156] By comparing the experimental results shown in Table 1, it can be found that the process in Comparative Example 1 is relatively complex and prone to scaling on the tower wall. Furthermore, the rotary spray atomizer has a low rotation speed, producing larger droplets and insufficient gas-liquid mixing. In Comparative Example 2, a spray tower is used, which can only spray at a fixed angle and has a small spray range, resulting in poor gas-liquid mixing and low desulfurization efficiency. The rotary spray flue gas desulfurization device provided in this embodiment of the invention provides better gas-liquid mixing, significantly improving desulfurization efficiency. Moreover, the swirling device creates a swirling flow state for the gas-liquid mixture, mitigating the adhesion of wet materials to the wall and significantly reducing scaling on the inner wall of the desulfurization tower during operation.

[0157] Furthermore, as can be seen from the data in Table 1, Example 3 exhibits better desulfurization performance. With the rotary atomizer 5 at the top of the tower rotating at 36,000 rpm, the angle between the tangent at the bottom of the arc-shaped guide plate 11 and the horizontal direction being 60°, the rotary atomizer 5 rotating clockwise, and the swirl device 9 rotating counterclockwise, and a reaction temperature of 55°C, sufficient contact and reaction between the flue gas and the droplets are achieved. Overall, Example 3 is the preferred embodiment of this invention.

[0158] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the invention is presented with fewer features than all of the features in a single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of the invention.

[0159] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term “comprising” as used in the specification or claims is interpreted in a manner similar to the term “including,” just as “including,” is interpreted as a conjunction in the claims. Additionally, the use of any term “or” in the specification of the claims is intended to mean “non-exclusive or.”

Claims

1. A rotary spray flue gas desulfurization treatment device, characterized in that, include: Liquid silo, rotary spray atomizer, desulfurization tower, flue gas distributor, gas collection chamber and cyclone device; The flue gas distributor and the rotary spray atomizer are located at the top of the desulfurization tower. The rotary spray atomizer is connected to the liquid feed tank and is used to rotate and atomize the desulfurizing agent to form desulfurization droplets. The gas collection chamber is located inside the desulfurization tower and directly below the rotary spray atomizer; The cyclone device is used to convert the gas-liquid mixture in the gas collection chamber into a cyclone state and circulate it upward into the desulfurization tower. The gas collection chamber opens upwards, and the upper cross-sectional area is larger than the lower cross-sectional area; The swirling device includes a swirling inner column and a plurality of arc-shaped guide plates arranged around the swirling inner column; The swirling inner column and the plurality of arc-shaped guide plates are placed in the gas collection chamber; The swirling inner column is adapted to drive the plurality of arc-shaped guide plates to rotate; The plurality of arc-shaped guide plates are inclinedly arranged around the inner column of the vortex; the plurality of arc-shaped guide plates are evenly distributed; the arc-shaped guide plates are spiral curved surfaces; The rotation direction of the rotary spray atomizer is opposite to the swirling direction of the swirling device.

2. The flue gas desulfurization treatment device as described in claim 1, characterized in that, The swirling device also includes a drive motor connected to the inner swirling column to drive the inner swirling column and the plurality of arc-shaped guide plates to rotate.

3. The flue gas desulfurization treatment device as described in claim 1, characterized in that, The angle between the tangent at the bottom of the arc-shaped guide plate and the horizontal direction is 40~70°.

4. The flue gas desulfurization treatment device as described in claim 1, characterized in that, The swirling device also includes a support rod; The support rod is fixed to the inner wall of the desulfurization tower, and the gas collection chamber is fixed to the support rod.

5. The flue gas desulfurization treatment device as described in claim 1, characterized in that, It also includes peristaltic pumps and preheaters; The rotary spray atomizer is connected to the liquid tank via the peristaltic pump and the preheater.

6. The flue gas desulfurization treatment device as described in claim 5, characterized in that, It also includes control valves; The control valve is located between the peristaltic pump and the preheater.

7. The flue gas desulfurization treatment device as described in claim 1, characterized in that, The desulfurization tower is equipped with a flue gas outlet and a waste liquid outlet at its bottom.

8. The flue gas desulfurization treatment device as described in claim 1, characterized in that, It also includes waste liquid collection devices; The waste liquid collection device is located below the waste liquid outlet.

9. The flue gas desulfurization treatment device as described in claim 1, characterized in that, It also includes denitrification devices; The denitrification device is connected to the flue gas distributor.

10. The flue gas desulfurization treatment device as described in claim 9, characterized in that, It also includes dust collectors; The dust collector is located between the denitrification device and the flue gas distributor.

11. The flue gas desulfurization treatment device as described in claim 1, characterized in that, It also includes dust collectors; The dust collector is connected to the flue gas distributor.

12. A flue gas desulfurization treatment method, using the flue gas desulfurization treatment device according to any one of claims 1-11, characterized in that, Includes the following steps: The flue gas is guided into the desulfurization tower after being guided by the flue gas distributor. The desulfurizing agent in the feed tank is fed into a rotary spray atomizer to rotate and atomize into desulfurization droplets, which are then sent into the desulfurization tower to mix with the flue gas to form a gas-liquid mixture. The gas-liquid mixture moving into the gas collection chamber is converted into a swirling state by the swirling device, and then flows upward into the desulfurization tower, where it mixes again with the desulfurization droplets to obtain purified flue gas.

13. The method as described in claim 12, characterized in that, Also includes: The flow rates of the flue gas and the desulfurizing agent are controlled at 3000:1 to 10000:1.

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