Rotary spray type flue gas desulfurization treatment device and method

Abstract

The invention provides a rotary spray type flue gas desulfurization treatment device and a rotary spray type flue gas desulfurization treatment method. In the device, a flue gas distributor and a rotary spray atomizer are arranged at the top of a desulfurization tower, and the rotary spray atomizer is connected with a feed liquid bin and is used for rotationally atomizing a desulfurizing agent to form desulfurization fog drops; the gas collection chamber is arranged in the desulfurization tower and is positioned right below the rotary spray atomizer; and the rotational flow device is used for converting the gas-liquid mixture in the gas collection chamber into a rotational flow state and circularly and upwards introducing the gas-liquid mixture into the desulfurization tower. And the gas-liquid mixture reaching the gas collecting chamber is matched with the gas collecting chamber through the rotational flow device, so that the gas-liquid mixture in a rotational flow form circularly enters the desulfurization tower, the flue gas distribution is more uniform, the flue gas retention time is longer, and the reaction is more efficient. And moreover, the wall sticking phenomenon of wet materials is relieved, and scaling during operation in the tower is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas desulfurization treatment, and in particular relates to a rotary spray type flue gas desulfurization treatment device and method. Background Art

[0002] SO2 is one of the main gases that pollute the atmosphere. Its hazards mainly include damaging plant leaves, causing a reduction in forest area, polluting water quality, polluting soil, causing crop yield reduction or even death, and acidifying drinking groundwater.

[0003] There are three main sources of SO2: the combustion of sulfur-containing fuels; the smelting of sulfur-containing ores; and the exhaust gas emitted from industrial production processes such as chemical, sulfuric acid plants and power plants. The low-sulfur concentration flue gas from different SO2 sources includes FCC flue gas, ship flue gas and coke oven flue gas. The composition of coke oven flue gas is relatively complex. According to statistics, SO2 in FCC regeneration flue gas x The average content of sulfur in crude oil is about 800ppm. As the sulfur content in crude oil increases, the SO in FCC regeneration flue gas increases. x The content also increases accordingly. The SO2 concentration in coke oven flue gas is 140~500mg / Nm 3 SO2 easily reacts with NH3 to form NH4SO4, which can easily cause pipeline blockage and equipment corrosion. Therefore, flue gas desulfurization treatment is required.

[0004] According to the different phases of the operation process, flue gas desulfurization methods are usually divided into three categories: wet, dry and semi-dry. Among them, the wet process has been very mature after years of development and is currently the most commonly used flue gas desulfurization treatment method. Summary of the invention

[0005] In order to enrich the efficient desulfurization treatment methods to be applicable to more application scenarios, the present invention proposes a rotary spray flue gas desulfurization treatment device and method.

[0006] In a first aspect, an embodiment of the present invention provides a rotary spray flue gas desulfurization treatment device, comprising: a liquid silo, a rotary spray atomizer, a desulfurization tower, a flue gas distributor, a gas collecting chamber and a cyclone device;

[0007] The flue gas distributor and the rotary spray atomizer are arranged at the top of the desulfurization tower, and the rotary spray atomizer is connected to the liquid silo to rotary atomize the desulfurizer to form desulfurization droplets;

[0008] The gas collecting chamber is arranged in the desulfurization tower and is located directly below the rotary spray atomizer;

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

[0010] In one or some optional embodiments, the plenum chamber opens upward, and an upper cross-sectional area is larger than a lower cross-sectional area.

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

[0012] The swirl inner column and the plurality of arc-shaped guide plates are placed in the air collecting chamber;

[0013] The swirl inner column is suitable for driving the plurality of arc-shaped guide plates to rotate.

[0014] In one or some optional embodiments, the swirl device further includes a driving motor, and the driving motor is connected to the swirl inner column to drive the swirl inner column and the multiple arc-shaped guide plates to rotate.

[0015] In one or some optional embodiments, the plurality of arc-shaped guide plates are arranged obliquely around the swirl inner column.

[0016] In one or some optional embodiments, the plurality of arc-shaped guide plates are evenly arranged.

[0017] In one or some optional embodiments, the arc-shaped guide plate is in the shape of a spiral surface.

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

[0019] In one or some optional embodiments, the cyclone device further comprises a support rod;

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

[0021] In one or some optional embodiments, the rotation direction of the rotary spray atomizer is opposite to the swirl direction of the swirl device.

[0022] In one or some 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 storage bin via the peristaltic pump and the preheater.

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

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

[0026] In one or some optional embodiments, a flue gas outlet and a waste liquid outlet are provided at the bottom of the desulfurization tower.

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

[0028] The waste liquid collecting device is arranged below the waste liquid outlet.

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

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

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

[0034] The dust collector is arranged between the denitration device and the flue gas distributor.

[0035] In a second aspect, an embodiment of the present invention provides a flue gas desulfurization treatment method, using the flue gas desulfurization treatment device described in the first aspect, comprising the following steps:

[0036] The flue gas is directed through a flue gas distributor and then sent into a desulfurization tower;

[0037] The desulfurizer in the liquid silo is passed into the rotary spray atomizer to form desulfurization droplets, which are then sent to the desulfurization tower, so that the desulfurization droplets are mixed with the flue gas in the desulfurization tower to form a gas-liquid mixture;

[0038] The gas-liquid mixture moves into the gas collecting chamber and is converted into a cyclonic state through a cyclonic device. The cyclonic flow then flows upward into the desulfurization tower and is mixed with the desulfurization droplets again to obtain purified flue gas.

[0039] In one or some optional embodiments, the method further comprises:

[0040] The flow rate of the flue gas and the desulfurizing agent is controlled within a range of 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 type flue gas desulfurization treatment device provided by the embodiment of the present invention realizes the reaction between flue gas and desulfurization droplets through a flue gas distributor and a rotary spray atomizer to form a gas-liquid mixture. The gas-liquid mixture reaching the gas collecting chamber is converted from a flow state to a cyclone state through a cyclone device to realize flue gas redistribution. The gas-liquid mixture in a cyclone form circulates and enters the desulfurization tower again to mix with the desulfurization droplets again, optimizing the flue gas distribution in the tower, making the flue gas distribution more uniform, extending the flue gas residence time, improving the gas-liquid mixing effect, making the reaction more efficient, and improving the flue gas desulfurization efficiency. In addition, the gas-liquid mixture in the cyclone state will alleviate the phenomenon of wet material sticking to the wall, thereby reducing scaling during operation.

[0043] The rotary spray flue gas desulfurization treatment device provided in the embodiment of the present invention can evenly distribute and stabilize the gas-liquid mixture in a swirl state formed by the rotation of the swirl device by arranging the gas collecting chamber just below the rotary spray atomizer in the desulfurization tower, and then evenly re-circulate the gas-liquid mixture into the desulfurization tower to make the gas-liquid mixing sufficient, thereby improving the flue gas desulfurization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0046] Figure 2 for Figure 1 The schematic diagram of the local structure of the cyclone device of the rotary spray flue gas desulfurization treatment device shown.

[0047] In the figure, 1. liquid bin; 2. peristaltic pump; 3. control valve; 4. preheater; 5. rotary spray atomizer; 6. desulfurization tower; 7. flue gas distributor; 8. gas collecting chamber; 9. cyclone device; 10. cyclone inner column; 11. arc guide plate; 12. support rod; 13. flue gas outlet; 14. drive motor; 15. waste liquid outlet; 16. waste liquid collecting device. DETAILED DESCRIPTION

[0048] The inventors compared different desulfurization treatment methods in the prior art and found that the wet desulfurization efficiency is generally high, generally above 90%, but there are problems such as large investment amount, high maintenance cost, easy corrosion of equipment, more scaling during operation and large floor space, which is not suitable for small and medium-sized enterprises. The investment cost of the dry process is lower than that of the wet process. The desulfurization product is dry, the equipment is not easy to be corroded, scaling and clogging are not easy to occur, but the desulfurization efficiency of the dry process is low, and the reaction rate is not high. The semi-dry process is a flue gas desulfurization technology in which the desulfurizer enters the desulfurization tower in a dry state for desulfurization and is reused in a wet state, or the desulfurizer enters the desulfurization tower in a wet state for desulfurization, and its desulfurization products are all dry. It has the advantages of simple equipment, small investment, and low technical requirements. However, the semi-dry process has many restrictions. In addition, the inventors found that in the existing desulfurization treatment device, when the desulfurization tower treats low sulfur concentration smoke, there are problems such as poor gas-liquid mass transfer effect, uneven flue gas distribution, insufficient gas-liquid mixing, low desulfurization efficiency, and easy scaling of the inner wall of the equipment, while the spray tower can only spray at a fixed angle and the spray range is small, which will lead to poor gas-liquid mixing effect and low removal rate. Therefore, the inventors made the present invention after further research and development.

[0049] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0050] The embodiment of the present invention provides a rotary spray type flue gas desulfurization treatment device, referring to Figure 1 and Figure 2 As shown, the flue gas desulfurization treatment device includes: a liquid silo 1, a rotary spray atomizer 5, a desulfurization tower 6, a flue gas distributor 7, a gas collecting chamber 8 and a cyclone device 9;

[0051] The flue gas distributor 7 and the rotary spray atomizer 5 are arranged at the top of the desulfurization tower 6, and the rotary spray atomizer 5 is connected to the liquid silo 1 to rotary atomize the desulfurizer to form desulfurization droplets;

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

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

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

[0055] The swirl inner column 10 and the plurality of arc-shaped guide plates 11 are placed in the air collecting chamber 8;

[0056] The swirl inner column 10 is suitable for driving the plurality of arc-shaped guide plates 11 to rotate.

[0057] In a specific embodiment, referring to Figure 1 As shown, the swirl device further includes a driving motor 14 , and the driving motor 14 is connected to the swirl inner column 10 to drive the swirl inner column 10 and the plurality of arc-shaped guide plates 11 to rotate.

[0058] In a specific embodiment, referring to Figure 1 As shown, the gas collecting chamber 8 opens upward, and the upper cross-sectional area is larger than the lower cross-sectional area. More specifically, the gas collecting chamber 8 is in the shape of a trumpet opening upward as a whole.

[0059] In a specific embodiment, the flue gas desulfurization treatment device also includes a peristaltic pump 2 and a preheater 4; the rotary spray atomizer 5 is connected to the liquid silo 1 via the peristaltic pump 2 and the preheater 4. After the configured desulfurizer is passed through the liquid silo 1 into the preheater 4 for heating, it enters the rotary spray atomizer 5 through the peristaltic pump 2, and the desulfurizer rotates in the rotary spray atomizer 5 to form desulfurization droplets. Before the desulfurizer in the liquid silo 1 is passed into the rotary spray atomizer 5, the desulfurizer is preheated by the preheater 4. The heating range of the preheater 4 is 40 to 80°C, preferably 50 to 60°C.

[0060] In order to facilitate the control of the desulfurizer passing into the rotary spray atomizer 5, the flue gas desulfurization treatment device can also include a control valve 3; the control valve 3 is arranged between the peristaltic pump 2 and the preheater 4, and the desulfurizer is passed into the rotary spray atomizer 5 by opening the control valve 3, and the flow control can also be achieved by adjusting the opening of the control valve 3.

[0061] The flue gas to be purified enters the flue gas distributor 7 from the flue to form multiple flue gases with the same speed but different directions. The multiple flue gases flow in parallel into the desulfurization tower 6, and are mixed with the desulfurization droplets to make the desulfurization droplets fully contact and react with the flue gas, thus achieving a primary flue gas desulfurization treatment. The gas-liquid mixture after the primary flue gas desulfurization treatment enters the gas collecting chamber 8, and the gas-liquid mixture in the gas collecting chamber 8 forms a cyclone state through the rotation of the cyclone device 9 in the gas collecting chamber 8. After the gas-liquid mixture is evenly and stably distributed in the gas collecting chamber 8, it circulates again into the desulfurization tower 6 under the condition of stable wind speed and dynamic pressure, thus achieving flue gas redistribution, and fully contact and react with the desulfurization droplets sprayed by the rotary spray atomizer 5 again, thus achieving a secondary flue gas desulfurization treatment.

[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. It can be seen from the figure that the flue gas forms a gas-liquid mixture after one flue gas desulfurization treatment. The gas-liquid mixture moves to the gas collecting chamber 8 and then circulates into the desulfurization tower 6 again, realizing secondary flue gas desulfurization treatment, extending the flue gas residence time, and allowing the gas-liquid to mix fully, which can greatly improve the desulfurization efficiency.

[0063] Reference Figure 1 As shown, in the flue gas desulfurization treatment device, a flue gas outlet 13 and a waste liquid outlet 15 are provided at the bottom of the desulfurization tower 6, and a waste liquid collecting device 16 is provided below the waste liquid outlet 15. During the operation of the flue gas desulfurization treatment device, the desulfurization droplets absorbing the sulfur component in the flue gas enter the waste liquid collecting device 16 below from the waste liquid outlet 15 under the action of gravity, and the purified flue gas is discharged through the flue gas outlet 15.

[0064] In the embodiment of the present invention, the specific implementation method of the flue gas distributor 7 can refer to the detailed description in the prior art. For example, the flue gas distributor 7 includes a volute flue, and a circle of annular gap outlets is provided at the bottom of the inner side of the volute flue; a conical disperser is installed at the lower part of the volute flue, and the air inlet at the top of the conical disperser is connected to the annular gap outlet on the inner side of the volute flue; a plurality of hydraulic tops are installed on the outer side of the inner wall of the volute flue, the bottom of the hydraulic top is connected and fixed to the top of the conical disperser, and a plurality of hydraulic tops are installed above the annular gap outlet, and a circle of smoke baffles that can move up and down is installed on the inner side of the volute flue near the annular gap outlet, the top of the hydraulic top is connected to the bottom of the top plate, and the inner wall of the volute flue is vertically provided with a movable groove on one side of the hydraulic top, and one side of the top plate is connected to the top of the smoke baffle through a connecting rod, and the connecting rod passes through the movable groove. A plurality of arc-shaped guide vanes are installed at the bottom of the volute flue. The arc-shaped guide vanes are evenly distributed in a counterclockwise direction along the circumference of the annular seam outlet of the volute flue, which is consistent with the flow direction of the smoke. The length of the arc-shaped guide vanes gradually decreases from the entrance of the volute flue to the other end, which is the same as the shrinking trend of the volute flue. The arc-shaped guide vanes form a plurality of arc-shaped flow channels inside the volute flue. When the smoke passes through the smoke distributor 7, under the action of the arc-shaped guide vanes of the volute flue, multiple streams of smoke with the same speed and different directions are formed.

[0065] In an embodiment of the present invention, the rotary spray atomizer 5 can be provided with a plurality of atomizing nozzles, through which the desulfurizing agent is dispersed into desulfurization droplets of 30 to 80 microns by high-speed rotation of the plurality of atomizing nozzles, so that the fine desulfurization droplets can be fully mixed with the flue gas to achieve the purpose of efficient desulfurization. Furthermore, the rotation speed of the rotary spray atomizer can be 30,000 to 40,000 r / min, preferably 34,000 to 36,000 r / min, so that a larger specific surface area is obtained during the rotation process, and the desulfurization efficiency is improved. The specific implementation method of the rotary spray atomizer 5 can refer to the detailed description in the prior art, which will not be repeated here.

[0066] The rotary spray type flue gas desulfurization treatment device provided in the embodiment of the present invention can make the gas-liquid mixing more complete and improve the desulfurization efficiency by arranging the gas collecting chamber and the cyclone device 9 in the desulfurization tower 6. Figure 2 As shown, in the cyclone device 9, a plurality of inclined arc guide plates 11 are arranged around the cyclone inner column 10, and the cyclone inner 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 cyclone inner column 10 and the plurality of arc guide plates 11 to rotate, and the flue gas is guided by the arc guide plates 11 so that the flue gas can be evenly distributed in the desulfurization tower 6. The cyclone device 9 is connected to the air collecting chamber 8 above, and the air collecting chamber 8 is in the shape of a trumpet opening upward, and the inner diameter gradually increases from bottom to top, and is fixed in the desulfurization tower 6 by a support rod 12. Specifically, the support rod 12 can be fixed to the inner wall of the desulfurization tower 6, and the air collecting chamber 8 is fixed to the support rod 12.

[0067] Furthermore, in order to achieve uniform airflow distribution, the plurality of arc-shaped guide plates 11 can be evenly arranged around the swirl inner column 10. Figure 1 As shown, the arc-shaped guide plate 11 may be in the shape of a spiral surface. 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 specific implementation process, the angle α can be fine-tuned according to actual needs, and the preferred angle is 55 to 65°.

[0068] In a specific embodiment, the rotation direction of the rotary spray atomizer 5 is opposite to the swirl direction of the swirl 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 directions of the spray droplets and the circulating gas-liquid mixture can be opposite, which increases the contact time between the two, makes the gas-liquid mixing sufficient, and improves the desulfurization efficiency.

[0069] In an embodiment of the present invention, in order to better improve the desulfurization efficiency, the amount of flue gas to be purified and the desulfurizer introduced into the desulfurization tower 6 can also be controlled. For example, a flow monitoring device can be set to monitor the flow rates of the flue gas to be purified and the desulfurizer respectively, and the flow rates of the flue gas to be purified and the desulfurizer are adjusted according to the monitoring values ​​returned by the flow monitoring device, so that the flow rates of the flue gas and the desulfurizer are controlled at 3000:1 to 10000:1, preferably 6500:1 to 8000:1.

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

[0071] The dust collector is arranged between the denitration device and the flue gas distributor.

[0072] Before the flue gas is introduced into the flue gas distributor, it can be pre-treated by passing through 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 be provided with a denitrification device, and the dust collector may be directly connected to the flue gas distributor 7; if the flue gas to be purified does not contain dust and 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 may be directly connected to the flue gas distributor 7. In the embodiment of the present invention, the dust discharged from the dust collector can be sent to the ash bin for recovery.

[0073] The rotary spray type flue gas desulfurization treatment device provided in the embodiment of the present invention can be executed according to the following steps when performing flue gas desulfurization treatment:

[0074] The flue gas to be purified is pre-treated by a denitrification device and a dust collector to obtain pre-treated flue gas;

[0075] The pre-treated flue gas is directed through a flue gas distributor 7 to form multiple flue gases with the same speed and different directions and sent to a desulfurization tower 6;

[0076] The desulfurizer in the liquid silo 1 is passed into the preheater 4 for heating, and then enters the rotary spray atomizer 5 through the peristaltic pump 2, so that the desulfurizer is rotary atomized to form desulfurization droplets, which are sent to the desulfurization tower 6, and the desulfurization droplets are mixed with the flue gas in the desulfurization tower 6 to form a gas-liquid mixture;

[0077] After the gas-liquid mixture moves into the gas collecting chamber 8 and rotates through the multiple arc-shaped guide plates 11 of the cyclone device 9 to form a cyclone state, the flue gas is evenly distributed and stabilized in the gas collecting chamber, and then the cyclone flows upward into the desulfurization tower 6, where it is mixed with the desulfurization droplets again to obtain purified flue gas.

[0078] The desulfurization droplets after absorbing the sulfur components enter the waste liquid collection device 16 to wait for subsequent treatment, and the purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower.

[0079] The rotary spray type flue gas desulfurization treatment device provided by the embodiment of the present invention realizes the reaction between flue gas and desulfurization droplets through a flue gas distributor and a rotary spray atomizer to form a gas-liquid mixture. The gas-liquid mixture reaching the gas collecting chamber is converted from a flow state to a cyclone state through a cyclone device to realize flue gas redistribution. The gas-liquid mixture in a cyclone form circulates and enters the desulfurization tower again to mix with the desulfurization droplets again, optimizing the flue gas distribution in the tower, making the flue gas distribution more uniform, extending the flue gas residence time, improving the gas-liquid mixing effect, making the reaction more efficient, and improving the flue gas desulfurization efficiency. In addition, the gas-liquid mixture in the cyclone state will alleviate the phenomenon of wet material sticking to the wall, thereby reducing scaling during operation.

[0080] The rotary spray flue gas desulfurization treatment device provided in the embodiment of the present invention can evenly distribute and stabilize the gas-liquid mixture in a swirl state formed by the rotation of the swirl device by arranging the gas collecting chamber just below the rotary spray atomizer in the desulfurization tower, and then evenly re-circulate the gas-liquid mixture into the desulfurization tower to make the gas-liquid mixing sufficient, thereby improving the flue gas desulfurization efficiency.

[0081] Based on the same inventive concept, an embodiment of the present invention further provides a flue gas desulfurization treatment method, using the above-mentioned rotary spray type flue gas desulfurization treatment device, comprising the following steps:

[0082] The flue gas is directed through the flue gas distributor 7 and then sent to the desulfurization tower 6;

[0083] The desulfurizer in the liquid silo 1 is passed into the rotary spray atomizer 5 to form desulfurization droplets, which are then sent to the desulfurization tower 6, so that the desulfurization droplets are mixed with the flue gas in the desulfurization tower 6 to form a gas-liquid mixture;

[0084] The gas-liquid mixture moving into the gas collecting chamber 8 is converted into a cyclonic state by the cyclone device 9, and then circulates upward into the desulfurization tower 6 to be mixed with the desulfurization droplets again to obtain purified flue gas.

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

[0086] The flow rate of the flue gas and the desulfurizing agent is controlled within a range of 3000:1 to 10000:1, preferably 6500:1 to 8000:1.

[0087] In an optional embodiment, the method further comprises, before the desulfurizing agent in the liquid silo 1 is passed into the rotary spray atomizer 5, preheating the desulfurizing agent with a preheater 4. The preheater 4 has a heating range of 40 to 80°C, preferably 50 to 60°C.

[0088] In order to more clearly illustrate the rotary spray type flue gas desulfurization treatment device and the desulfurization treatment method provided by the embodiment of the present invention, several specific embodiments are described below, and the effect of the rotary spray type flue gas desulfurization treatment device provided by the embodiment of the present invention is verified:

[0089] Example 1

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

[0091] The desulfurizer is a calcium-based desulfurizer, and the content of Ca(OH)2 is 20wt%.

[0092] The simulated flue gas composition treated (volume): SO2: 156mg / Nm 3 , CO2: 1115mg / Nm 3 ; O2: 14.5%; H2O: 12.2%, CO: 1.05%; NO x : 0.5%, organic sulfide (COS) content is 70mg / Nm 3 , and the rest is nitrogen.

[0093] The reaction temperature was 50°C.

[0094] The steps of treating flue gas using the above device are:

[0095] (1) Flue gas pretreatment: Flue gas is treated with 2×10 4 m 3 The flow rate of / h is first processed by the denitrification device and then dedusted by the dust collector to obtain the pre-treated flue gas which is sent to the flue gas distributor 7. The pre-treated flue gas is guided through the flue gas distributor 7 to form multiple flue gases with the same speed and different directions which are sent to the desulfurization tower 6;

[0096] (2) Gas-liquid mixing and atomization: Open valve 3 to allow the prepared desulfurizer to flow at 3m 3 The flow rate of / h is passed through the liquid bin 1 into the preheater 4 and heated to 50°C, and then enters the rotary spray atomizer 5 through the peristaltic pump 2. The desulfurizer is rotary atomized in the rotary spray atomizer 5 to form desulfurization droplets, which are mixed with the flue gas 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 collecting chamber 8 and is rotated by the cyclone device 9 to form a cyclone state. After the flue gas is evenly distributed and stable in the gas collecting chamber 8, the cyclone flows upward into the desulfurization tower 6 and is mixed with the desulfurization droplets again to obtain purified flue gas;

[0098] (4) Desulfurization agent treatment and flue gas purification: After absorbing the sulfur component, the desulfurization droplets enter the waste liquid collection device 16 and wait for subsequent treatment. The purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower 6. The exhaust gas is detected by the flue gas analyzer, and the SO2 residual concentration is 3mg / m 3 The desulfurization efficiency reached 98.08%, and the operating scale was 0.5g.

[0099] Example 2

[0100] In the high-efficiency rotary spray flue gas desulfurization tower of Example 2 of the present invention, the rotation speed of the rotary spray atomizer 5 at the top of the tower is 34,000 rpm, the angle α between the tangent direction of the bottom end 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 cyclone device 9 rotates in a counterclockwise direction.

[0101] The desulfurizer is a calcium-based desulfurizer, and the content of Ca(OH)2 is 20wt%.

[0102] The simulated flue gas composition treated (volume): SO2: 256mg / Nm 3 , CO2: 1115mg / Nm 3 ; O2: 16.7%; H2O: 12.2%, CO: 1.05%; NO x : 0.5%, organic sulfide (COS) content is 70mg / Nm 3 , and the rest is nitrogen.

[0103] The reaction temperature was 60°C.

[0104] The steps of treating flue gas using the above device are:

[0105] (1) Flue gas is 4×10 4 m 3 The flow rate of / h is first processed by the denitrification device and then dedusted by the dust collector to obtain the pre-treated flue gas which is sent to the flue gas distributor 7. The pre-treated flue gas is guided through the flue gas distributor 7 to form multiple flue gases with the same speed and different directions which are sent to the desulfurization tower 6;

[0106] (2) Gas-liquid mixing and atomization: Open valve 3 to allow the prepared desulfurizer to flow at 5m 3 The flow rate of / h is passed through the liquid bin 1 into the preheater 4 and heated to 60°C, and then enters the rotary spray atomizer 5 through the peristaltic pump 2. The desulfurizer is rotary atomized in the rotary spray atomizer 5 to form desulfurization droplets, which are mixed with the flue gas 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 collecting chamber 8 and is rotated by the cyclone device 9 to form a cyclone state. After the flue gas is evenly distributed and stable in the gas collecting chamber 8, the cyclone flows upward into the desulfurization tower 6 and is mixed with the desulfurization droplets again to obtain purified flue gas;

[0108] (4) Desulfurization agent treatment and flue gas purification: After absorbing the sulfur components, the desulfurization droplets enter the waste liquid collection device 16 and wait for subsequent treatment. The purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower 6. The exhaust gas is detected by the flue gas analyzer, and the SO2 residual concentration is 5mg / m 3 The desulfurization efficiency reached 98.05%, and the operating scale was 0.8g.

[0109] Example 3

[0110] In the high-efficiency rotary spray flue gas desulfurization tower of Example 3 of the present invention, the rotation speed of the rotary spray atomizer 5 at the top of the tower is 36,000 rpm, the angle α between the tangent direction of the bottom end 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 cyclone device 9 rotates in a counterclockwise direction.

[0111] The desulfurizer is a calcium-based desulfurizer, and the content of Ca(OH)2 is 20wt%.

[0112] The simulated flue gas composition treated (volume): SO2: 130mg / Nm 3 , CO2: 1110mg / Nm 3 ; O2: 13.7%; H2O: 12.2%, CO: 1.05%; NO x : 0.5%, organic sulfide (COS) content is 70mg / Nm 3 , and the rest is nitrogen.

[0113] The reaction temperature was 55°C.

[0114] The steps of treating flue gas using the above device are:

[0115] (1) Flue gas is 1.5×10 4 m 3 The flow rate of / h is first processed by the denitrification device and then dedusted by the dust collector to obtain the pre-treated flue gas which is sent to the flue gas distributor 7. The pre-treated flue gas is guided through the flue gas distributor 7 to form multiple flue gases with the same speed and different directions which are sent to the desulfurization tower 6;

[0116] (2) Gas-liquid mixing and atomization: Open valve 3 to allow the prepared desulfurizer to flow at 3.5m 3The flow rate of / h is passed through the liquid bin 1 into the preheater 4 and heated to 55°C, and then enters the rotary spray atomizer 5 through the peristaltic pump 2. The desulfurizer is rotary atomized in the rotary spray atomizer 5 to form desulfurization droplets, which are mixed with the flue gas 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 collecting chamber 8 and is rotated by the cyclone device 9 to form a cyclone state. After the flue gas is evenly distributed and stable in the gas collecting chamber 8, the cyclone flows upward into the desulfurization tower 6 and is mixed with the desulfurization droplets again to obtain purified flue gas;

[0118] (4) Desulfurization agent treatment and flue gas purification: After absorbing the sulfur component, the desulfurization droplets enter the waste liquid collection device 16 and wait for subsequent treatment. The purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower 6. The exhaust gas is detected by the flue gas analyzer, and the SO2 residual concentration is 2mg / m 3 The desulfurization efficiency reached 98.46%, and the operating scale was 0.5g.

[0119] Example 4

[0120] The high-efficiency rotary spray flue gas desulfurization tower of Example 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, an angle α between the tangent direction of the bottom end of the arc-shaped guide plate 11 and the horizontal direction is 60°, the rotary spray atomizer 5 rotates counterclockwise, and the cyclone device 9 rotates clockwise.

[0121] The desulfurizer is a calcium-based desulfurizer, and the content of Ca(OH)2 is 20wt%.

[0122] The simulated flue gas composition treated (volume): SO2: 208mg / Nm 3 , CO2: 1115mg / Nm 3 ; O2: 16.7%; H2O: 12.2%, CO: 1.05%; NO x : 0.5%, organic sulfide (COS) content is 70mg / Nm 3 , and the rest is nitrogen.

[0123] The reaction temperature was 55°C.

[0124] The steps of treating flue gas using the above device are:

[0125] (1) Flue gas is 3×10 4 m 3 The flow rate of / h is first processed by the denitrification device and then dedusted by the dust collector to obtain the pre-treated flue gas which is sent to the flue gas distributor 7. The pre-treated flue gas is guided through the flue gas distributor 7 to form multiple flue gases with the same speed and different directions which are sent to the desulfurization tower 6;

[0126] (2) Gas-liquid mixing and atomization: Open valve 3 to allow the prepared desulfurizer to flow at 4.5m 3 The flow rate of / h is passed through the liquid bin 1 into the preheater 4 and heated to 55°C, and then enters the rotary spray atomizer 5 through the peristaltic pump 2. The desulfurizer is rotary atomized in the rotary spray atomizer 5 to form desulfurization droplets, which are mixed with the flue gas 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 collecting chamber 8 and is rotated by the cyclone device 9 to form a cyclone state. After the flue gas is evenly distributed and stable in the gas collecting chamber 8, the cyclone flows upward into the desulfurization tower 6 and is mixed with the desulfurization droplets again to obtain purified flue gas;

[0128] (4) Desulfurization agent treatment and flue gas purification: After absorbing the sulfur components, the desulfurization droplets enter the waste liquid collection device 16 and wait for subsequent treatment. The purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower 6. The exhaust gas is detected by the flue gas analyzer, and the SO2 residual concentration is 4 mg / m 3 The desulfurization efficiency reached 98.08%, and the operating scale was 0.8g.

[0129] Example 5

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

[0131] The desulfurizer is a calcium-based desulfurizer, and the content of Ca(OH)2 is 20wt%.

[0132] The simulated flue gas composition treated (volume): SO2: 168mg / Nm 3 , CO2: 1110mg / Nm 3 ; O2: 13.2%; H2O: 14.2%, CO: 1.05%; NO x : 0.5%, organic sulfide (COS) content is 70mg / Nm 3 , the rest is nitrogen. The reaction temperature is 55°C.

[0133] The steps of treating flue gas using the above device are:

[0134] (1) Flue gas is 3.5×10 4 m 3The flow rate of / h is first processed by the denitrification device and then dedusted by the dust collector to obtain the pre-treated flue gas which is sent to the flue gas distributor 7. The pre-treated flue gas is guided through the flue gas distributor 7 to form multiple flue gases with the same speed and different directions which are sent to the desulfurization tower 6;

[0135] (2) Gas-liquid mixing and atomization: Open valve 3 to allow the prepared desulfurizer to flow at 4.5m 3 The flow rate of / h is passed through the liquid bin 1 into the preheater 4 and heated to 55°C, and then enters the rotary spray atomizer 5 through the peristaltic pump 2. The desulfurizer is rotary atomized in the rotary spray atomizer 5 to form desulfurization droplets, which are mixed with the flue gas 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 collecting chamber 8 and is rotated by the cyclone device 9 to form a cyclone state. After the flue gas is evenly distributed and stable in the gas collecting chamber 8, the cyclone flows upward into the desulfurization tower 6 and is mixed with the desulfurization droplets again to obtain purified flue gas;

[0137] (4) Desulfurization agent treatment and flue gas purification: After absorbing the sulfur components, the desulfurization droplets enter the waste liquid collection device 16 and wait for subsequent treatment. The purified flue gas is discharged through the flue gas outlet 13 below the desulfurization tower 6. The exhaust gas is detected by the flue gas analyzer, and the SO2 residual concentration is 5mg / m 3 The desulfurization efficiency reached 97.02%, and the operating scale was 0.9g.

[0138] Comparative Example 1

[0139] In this comparative example 1, a conventional rotary spray desulfurization tower is used, such as the rotary spray desulfurization tower described in patent CN103446873A, to desulfurize the flue gas. The composition (volume) of the simulated flue gas treated is: SO2: 130 mg / Nm 3 , CO2: 1110mg / Nm 3 ; O2: 13.7%; H2O: 12.2%, CO: 1.05%; NO x : 0.5%, organic sulfide (COS) content is 70mg / Nm 3 , and the rest is nitrogen.

[0140] The desulfurizer is a calcium-based desulfurizer, and the content of Ca(OH)2 is 20wt%.

[0141] The reaction temperature was 55°C.

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

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

[0144] (2) Gas-liquid mixing and atomization: The prepared desulfurizer is 3.5m 3 The flow rate of / h is passed through the liquid silo into the preheater and heated to 55°C, and then enters the rotary spray atomizer through the peristaltic pump at the top of the rotary spray desulfurization tower. The desulfurizer rotates in the rotary spray atomizer at the top of the traditional rotary spray desulfurization tower to form droplets, which are mixed with the flue gas.

[0145] (3) Desulfurization agent treatment and flue gas purification: The desulfurization agent after absorption enters the collection chamber at the lower outlet for subsequent treatment. The purified flue gas is discharged through the flue gas outlet at the bottom of the desulfurization tower. The exhaust gas is detected by the flue gas analyzer, and the residual concentration of SO2 is 24mg / m 3 The desulfurization efficiency is 81.54%, and the operating scale is 23.9g.

[0146] Comparative Example 2

[0147] In this comparative example 2, a spray tower is used to desulfurize the flue gas, and the composition (volume) of the simulated flue gas treated is: SO2: 130 mg / Nm 3 , CO2: 1110mg / Nm 3 ; O2: 13.7%; H2O: 12.2%, CO: 1.05%; NO x : 0.5%, organic sulfide (COS) content is 70mg / Nm 3 , and the rest is nitrogen.

[0148] The desulfurizer is a calcium-based desulfurizer, and the content of Ca(OH)2 is 20wt%.

[0149] The reaction temperature was 55°C.

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

[0151] (1) Flue gas is 1.5×10 4 m 3 The flow rate of / h is processed by the denitrification device, and then dedusted by the dust collector before being sent to the spray tower;

[0152] (2) Gas-liquid mixing and atomization: The prepared desulfurizer is 3.5m 3 The flow rate of / h is passed through the liquid silo into the preheater and heated to 55℃, then enters the spray tower and mixes with the flue gas;

[0153] (3) Desulfurization agent treatment and flue gas purification: The desulfurization agent after absorption enters the collection chamber at the lower outlet for subsequent treatment. The purified flue gas is discharged through the flue gas outlet at the bottom of the desulfurization tower. The exhaust gas is detected by the flue gas analyzer, and the residual concentration of SO2 is 19mg / m 3 The desulfurization efficiency is 85.38%, and the operating scale is 15.7g.

[0154] Table 1

[0155]

[0156] By comparing the experimental results shown in Table 1, it can be found that the process of Comparative Example 1 is relatively complicated and is prone to scaling on the tower wall. At the same time, the rotary spray atomizer has a low rotation speed, the droplets generated are large, and the gas-liquid mixing is not sufficient. In Comparative Example 2, because a spray tower is used, the spray tower can only spray at a fixed angle, and the spray range is small, which will lead to poor gas-liquid mixing effect and low desulfurization efficiency. The rotary spray flue gas desulfurization treatment device provided in the embodiment of the present invention has a better gas-liquid mixing effect, can significantly improve the desulfurization efficiency, and, by using the cyclone device to swirl the gas-liquid mixture to form a cyclone fluid state, the phenomenon of wet material sticking to the wall is alleviated, and scaling on the inner wall of the desulfurization tower during operation is significantly reduced.

[0157] Further, it can be seen from the data in Table 1 that the desulfurization effect of Example 3 is better. The rotation speed of the rotary spray atomizer 5 at the top of the tower is 36000 rpm, the angle between the tangent direction of the bottom end of the arc guide plate 11 and the horizontal direction is 60°, the rotary spray atomizer 5 rotates in a clockwise direction, and the cyclone device 9 rotates in a counterclockwise direction. The reaction temperature is 55°C, which allows the flue gas and the droplets to fully contact and react. Overall, the scheme of Example 3 is a preferred scheme of the present invention.

[0158] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0159] The above description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is encompassed in a manner similar to the term "including", as explained by "including," used as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A rotary spray type flue gas desulfurization treatment device, characterized in that: include: Liquid silo, rotary spray atomizer, desulfurization tower, flue gas distributor, gas collecting chamber and cyclone device; The flue gas distributor and the rotary spray atomizer are arranged at the top of the desulfurization tower, and the rotary spray atomizer is connected to the liquid silo to rotary atomize the desulfurizer to form desulfurization droplets; The gas collecting chamber is arranged in the desulfurization tower and is located directly below the rotary spray atomizer; The cyclone device is used to convert the gas-liquid mixture in the gas collecting chamber into a cyclone state, and circulate it upward into the desulfurization tower.

2. The flue gas desulfurization treatment device according to claim 1, characterized in that: The gas collecting chamber opens upward, and the upper cross-sectional area is larger than the lower cross-sectional area.

3. The flue gas desulfurization treatment device according to claim 1, characterized in that: The swirl device comprises a swirl inner column and a plurality of arc-shaped guide plates arranged around the swirl inner column; The swirl inner column and the plurality of arc-shaped guide plates are placed in the air collecting chamber; The swirl inner column is suitable for driving the plurality of arc-shaped guide plates to rotate.

4. The flue gas desulfurization treatment device according to claim 3, characterized in that: The swirl device also includes a driving motor, which is connected to the swirl inner column to drive the swirl inner column and the multiple arc-shaped guide plates to rotate.

5. The flue gas desulfurization treatment device according to claim 3, characterized in that: The plurality of arc-shaped guide plates are arranged obliquely around the swirl inner column.

6. The flue gas desulfurization treatment device according to claim 3, characterized in that: The multiple arc-shaped guide plates are evenly arranged.

7. The flue gas desulfurization treatment device according to claim 3, characterized in that: The arc-shaped guide plate is in the shape of a spiral curved surface.

8. The flue gas desulfurization treatment device according to claim 3, characterized in that: The angle between the tangent direction of the bottom end of the arc-shaped guide plate and the horizontal direction is 40 to 70 degrees.

9. The flue gas desulfurization treatment device according to claim 1, characterized in that: The cyclone device also includes a support rod; The support rod is fixed to the inner wall of the desulfurization tower, and the gas collecting chamber is fixed to the support rod.

10. The flue gas desulfurization treatment device according to claim 1, characterized in that: The rotation direction of the rotary spray atomizer is opposite to the swirl direction of the swirl device.

11. The flue gas desulfurization treatment device according to claim 1, characterized in that: Also includes a peristaltic pump and preheater; The rotary spray atomizer is connected to the liquid storage bin via the peristaltic pump and the preheater.

12. The flue gas desulfurization treatment device according to claim 11, characterized in that: Also included are control valves; The control valve is arranged between the peristaltic pump and the preheater.

13. The flue gas desulfurization treatment device according to claim 1, characterized in that: The bottom of the desulfurization tower is provided with a flue gas outlet and a waste liquid outlet.

14. The flue gas desulfurization treatment device according to claim 1, characterized in that: Also includes a waste liquid collection device; The waste liquid collecting device is arranged below the waste liquid outlet.

15. The flue gas desulfurization treatment device according to claim 1, characterized in that: It also includes a denitrification device; The denitration device is connected to the flue gas distributor.

16. The flue gas desulfurization treatment device according to claim 15, characterized in that: Also includes dust collector; The dust collector is arranged between the denitration device and the flue gas distributor.

17. The flue gas desulfurization treatment device according to claim 1, characterized in that: Also includes dust collector; The dust collector is connected to the flue gas distributor.

18. A flue gas desulfurization treatment method, using the flue gas desulfurization treatment device according to any one of claims 1 to 17, characterized in that: The steps include: The flue gas is directed through a flue gas distributor and then sent into a desulfurization tower; The desulfurizer in the liquid silo is passed into the rotary spray atomizer to form desulfurization droplets, which are then sent to the desulfurization tower, so that the desulfurization droplets are mixed with the flue gas in the desulfurization tower to form a gas-liquid mixture; The gas-liquid mixture moves into the gas collecting chamber and is converted into a cyclonic state through a cyclonic device. The cyclonic flow then flows upward into the desulfurization tower and is mixed with the desulfurization droplets again to obtain purified flue gas.

19. The method according to claim 18, characterized in that Also includes: The flow rate of the flue gas and the desulfurizing agent is controlled within a range of 3000:1 to 10000:1.

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