A flue gas cyclone distributor for rotary spray desulfurization

Abstract

The present invention discloses a flue gas cyclone distributor for rotary spray desulfurization, comprising an inner flue and an outer flue, wherein a bracket of a cross-shaped structure is arranged in the inner flue, and the inner flue is connected and fixed to the outer flue through the bracket, a circular flow equalizer is arranged at the inlet cross section of the inner flue, and a plurality of external cyclone sheets are arranged with equal arcs between the outlet of the inner flue and the outlet of the outer flue. The beneficial effect of the present invention is as follows: by dividing the single flue at the bottom of the rotary spray desulfurization tower into a combination of inner and outer flues, cyclone sheets are installed at the outlets of the inner and outer flues, and the inclination angle of the external cyclone sheets is greater than that of the internal cyclone sheets, the flue gas is divided into an upward airflow with a larger velocity component in the vertical direction, and an airflow with a larger rotation intensity that diffuses to the surroundings. Not only the flue gas convection intensity around the atomizing wheel is increased, but also the cyclone intensity of the flue gas in the tower is increased, thereby increasing the mixing intensity of the flue gas and the desulfurizer, and improving the desulfurization efficiency.

Description

Technical Field

[0001] The invention relates to a flue gas cyclone distributor, in particular to a flue gas cyclone distributor used for rotary spray desulfurization, belonging to the technical field of flue gas cyclone distributor application. Background Art

[0002] SO2 gas is one of the main air pollutants and the main cause of acid rain. With the rapid development of industrialization in my country, the air pollution problem caused by SO2 is becoming increasingly serious. Faced with the severe pollution situation, the Ministry of Ecology and Environment of the People's Republic of China issued the "Opinions on Promoting the Implementation of Ultra-low Emissions in the Steel Industry", proposing that by the end of 2025, more than 80% of steel companies across the country will strive to complete ultra-low emission transformation, and the SO2 concentration limit will be 35mg / Nm3.

[0003] The rotary spray desulfurization process is a relatively mature semi-dry desulfurization process, which is widely used due to its advantages such as simple process, strong adaptability to working conditions, and no wastewater generation during the process. With the continuous strengthening of environmental protection requirements, the existing rotary spray desulfurization technology is difficult to meet the ultra-low emission requirements.

[0004] The distribution effect of sulfur-containing flue gas is the main factor affecting rotary spray desulfurization, which affects the mixing intensity of flue gas and desulfurizer in the desulfurization tower and the evaporation rate of water. The top flue gas distributor and the central cyclone of the rotary spray desulfurization tower make the flue gas form strong convection around the atomizing wheel, so that the desulfurizer slurry is quickly dried and chemically reacted at the outlet of the atomizing wheel.

[0005] However, in the existing technology, the flue gas cyclone distributor has the problem of unreasonable flue gas distribution. After the flue gas passes through the cyclone distributor, it rotates upward and its cyclone strength is weak, which causes poor mixing strength between the flue gas and the desulfurizer slurry, poor drying and reaction effects, and produces adverse effects. If the inclination angle of the cyclone plate is changed and the cyclone intensity is increased, the vertical upward velocity component will be reduced and the radial velocity component will be increased, which will also cause the problem of unsatisfactory mixing effect of gas, solid and liquid. At the same time, the poor distribution effect also causes the problem of uneven flue gas distribution, resulting in low desulfurization efficiency.

[0006] In summary, overcoming the insufficiency of unreasonable airflow distribution of flue gas cyclone distributor in the existing rotary spray desulfurization technology is a problem that urgently needs to be solved in the prior art. Summary of the invention

[0007] The purpose of the present invention is to solve the problem of unreasonable flue gas distribution in the flue gas cyclone distributor. After passing through the cyclone distributor, the flue gas rotates upward and its cyclone intensity is weak, which results in poor mixing intensity between the flue gas and the desulfurizer slurry, poor drying and reaction effects, and adverse effects. If the inclination angle of the cyclone plate is changed and the cyclone intensity is increased, the vertical upward velocity component will be reduced and the radial velocity component will be increased, which will also result in unsatisfactory gas, solid and liquid mixing effects. At the same time, the poor distribution effect also causes uneven flue gas distribution, which leads to low desulfurization efficiency. A flue gas cyclone distributor for rotary spray desulfurization is proposed.

[0008] The objective of the present invention can be achieved through the following technical scheme: a flue gas cyclone distributor for rotary spray desulfurization, comprising an inner flue and an outer flue, a cross-shaped bracket is arranged in the inner flue, and the inner flue is connected and fixed to the outer flue through the bracket, a circular flow equalizer is arranged at the inlet cross section of the inner flue, and a plurality of external cyclone plates are arranged with equal arcs between the outlet of the inner flue and the outlet of the outer flue, and a plurality of internal cyclone plates are arranged with equal arcs at the outlet of the inner flue, and both the external cyclone plates and the internal cyclone plates are used to change the movement state of the flue gas.

[0009] A further technical improvement of the present invention is that a gradually expanding pipe section is connected to the outer flue outlet, and the gradually expanding pipe section is designed in a trumpet shape. The pipe cross-section of the gradually expanding pipe section gradually increases along the smoke outflow direction to increase the cross-sectional area of ​​the inner flue inlet, improve the outlet smoke flow rate, and obtain a better convection effect.

[0010] A further technical improvement of the present invention is that the inlet of the inner flue is connected to a tapered pipe section, and the pipe cross-section of the tapered pipe section gradually decreases along the flue gas inflow direction, and the height of the outer flue outlet is lower than the height of the inner flue outlet. In conjunction with the external swirl sheet, the flue gas can form a movement state that diffuses from the center to the surroundings in the desulfurization tower, which greatly improves the uniformity of flue gas distribution.

[0011] A further technical improvement of the present invention is that the area of ​​the flow equalizer is equal to the bottom inlet area of ​​the external flue, and the flow equalizer is composed of a plurality of vertical guide plates arranged with equal arcs to ensure uniform distribution of the flue gas flow entering the swirl distributor.

[0012] A further technical improvement of the present invention is that the external swirl sheet is trapezoidal in shape, and the short side of the external swirl sheet is connected to the outer wall of the inner flue, the long side of the external swirl sheet is connected to the outer flue outlet, and the internal swirl sheet is rectangular and connected to the bracket of the inner flue.

[0013] A further technical improvement of the present invention is that: there is a height difference between the outlets of the outer flue and the inner flue, and the outlet of the inner flue is higher than the outlet of the outer flue.

[0014] A further technical improvement of the present invention is that the inclination angle of the external swirl plate is counterclockwise, the inclination angle direction of the internal swirl plate is the same as that of the external swirl plate, the inclination angle of the external swirl plate is greater than or equal to the inclination angle of the internal swirl plate, and the inclination angle of the external swirl plate is 0-45°.

[0015] A further technical improvement of the present invention is that the external swirl sheets and the internal swirl sheets are evenly distributed along the pipe outlet cross section, and the number of the external swirl sheets and the number of the internal swirl sheets are both 6-18.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention is a flue gas cyclone distributor for rotary spray desulfurization. The single flue at the bottom of the rotary spray desulfurization tower is divided into an inner and outer flue combination. The inner and outer flue outlets are both equipped with cyclone plates, and the inclination angle of the outer cyclone plates is greater than that of the inner cyclone plates, thereby dividing the flue gas into an upward airflow with a larger vertical velocity component and a diffuse airflow with a larger rotation intensity. Not only the flue gas convection intensity around the atomizing wheel is increased, but also the cyclone intensity of the flue gas in the tower is increased, thereby increasing the mixing intensity of the flue gas and the desulfurizer, and improving the desulfurization efficiency.

[0018] (2) The present invention is a flue gas cyclone distributor for rotary spray desulfurization, which increases the cross-sectional area of ​​the inner flue inlet by arranging a tapered pipe section at the inner flue inlet, improves the outlet flue gas flow rate, and obtains a better convection effect; and arranges a trumpet-shaped pipe at the outer flue outlet, and the height of the outer flue outlet is lower than the height of the inner flue outlet, and cooperates with the external cyclone plate, so that the flue gas can form a movement state that diffuses from the center to the surroundings in the desulfurization tower, which greatly improves the uniformity of flue gas distribution.

[0019] (3) A flue gas cyclone distributor for rotary spray desulfurization of the present invention provides a flow equalizing plate at the inlet section of the inner flue to enhance the uniformity and stability of the flue gas flow in the cyclone distributor, thereby improving the distribution effect of the device on the flue gas.

[0020] (4) The flue gas cyclone distributor for rotary spray desulfurization of the present invention has a simple structure and is easy to manufacture. Compared with the existing rotary spray desulfurization cyclone, the flue gas distribution is more uniform, the cyclone intensity is high, the mixing effect of the flue gas and the desulfurizer is better, and the desulfurization effect is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2It is a top view of the present invention.

[0024] Figure 3 It is a top view of the guide plate in the present invention.

[0025] Figure 4 It is a schematic diagram of the cooperation between the present invention and the desulfurization tower.

[0026] In the figure: 1. External flue; 2. Internal flue; 3. Internal swirl blade; 4. External swirl blade; 5. Flow equalizer; 6. Desulfurization tower; 7. Top flue gas distributor; 8. Atomizer; 9. Bottom flue; 10. Outlet flue; 11. Bracket; 12. Guide plate. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-3 As shown, a flue gas cyclone distributor for rotary spray desulfurization includes an inner flue 2 and an outer flue 1, a cross-shaped bracket 11 is provided in the inner flue 2, and the inner flue 2 is fixedly connected to the outer flue 1 through the bracket 11, a circular flow equalizer 5 is provided at the inlet cross section of the inner flue 2, and a plurality of external cyclone sheets 4 are provided with equal arcs between the outlet of the inner flue 2 and the outlet of the outer flue 1, and a plurality of internal cyclone sheets 3 are provided with equal arcs at the outlet of the inner flue 2, and both the external cyclone sheets 4 and the internal cyclone sheets 3 are used to change the movement state of the flue gas.

[0029] The outlet of the outer flue 1 is connected with a gradually expanding pipe section, which is designed in a trumpet shape. The pipe cross-section of the gradually expanding pipe section gradually increases along the flue gas outflow direction to increase the cross-sectional area of ​​the inner flue inlet, improve the outlet flue gas flow rate, and obtain better convection effect.

[0030] The inlet of the inner flue 2 is connected to a tapered pipe section, and the pipe cross-section of the tapered pipe section gradually decreases along the flue gas inflow direction, and the outlet height of the outer flue 1 is lower than the outlet height of the inner flue 2. In conjunction with the external swirl sheet 4, the flue gas can form a movement state of diffusion from the center to the surroundings in the desulfurization tower, which greatly improves the uniformity of flue gas distribution.

[0031] The area of ​​the flow equalizer 5 is equal to the bottom inlet area of ​​the external flue 1, and the flow equalizer 5 is composed of a plurality of vertical guide plates 12 arranged with equal arcs to ensure uniform flow distribution of the flue gas entering the cyclone distributor.

[0032] The external swirl sheet 4 is trapezoidal in shape, and the short side of the external swirl sheet 4 is connected to the outer wall of the inner flue 2, and the long side of the external swirl sheet 4 is connected to the outlet of the outer flue 1. The internal swirl sheet 3 is rectangular and connected to the bracket 11 of the inner flue 2.

[0033] There is a height difference between the outlets of the outer flue 1 and the inner flue 2, and the outlet of the inner flue 2 is higher than the outlet of the outer flue 1.

[0034] The inclination angle of the external swirl plate 4 is counterclockwise, the inclination direction of the internal swirl plate 3 is the same as that of the external swirl plate 4, the inclination angle of the external swirl plate 4 is greater than or equal to the inclination angle of the internal swirl plate 3, and the inclination angle of the external swirl plate is 0-45°.

[0035] The external swirl sheets 4 and the internal swirl sheets 3 are evenly distributed along the pipe outlet cross section, and the number of the external swirl sheets 4 and the number of the internal swirl sheets 3 are both 6-18.

[0036] When the present invention is used, the flue gas is rectified by the flow equalizer 5 at the inlet of the cyclone distributor and then divided into two parts to enter the outer flue 1 and the inner flue 2 respectively. The inlet of the inner flue 2 is a tapered pipe section, so that the flow velocity of the flue gas increases after entering the inner flue. The outlet of the inner flue 2 is connected with an internal cyclone sheet 3 with a smaller inclination angle to obtain an increased vertical velocity component, thereby increasing the mixing intensity of the flue gas and the slurry around the atomizing wheel. The outlet of the outer flue 1 is provided with a trumpet-shaped pipe section and is connected with an external cyclone sheet with a larger inclination angle, so that the cyclone intensity of the flue gas is greatly enhanced to increase the mixing intensity between the flue gas and the incompletely reacted and dried desulfurizer. In addition, there is a certain height difference between the outlet of the inner flue and the outlet of the outer flue 1. The outlet position height of the inner flue 2 is higher than that of the outer flue 1. At the same time, the external cyclone sheet 4 is trapezoidal, and the long side is connected to the inner wall of the outer flue 1. The flow velocity of the flue gas outside is greater than that of the inner side, so that the flue gas forms a distribution effect of diffusion from the center to the surroundings, and the flue gas is distributed more evenly in the desulfurization tower, thereby improving the desulfurization efficiency.

[0037] See also Figure 4 As shown, it is a schematic diagram of the cooperation between the present invention and the desulfurization tower 6. The rotary spray desulfurization tower 6 is connected with a top flue gas distributor 7 and a bottom flue 9. The top of the bottom flue 9 is connected with a flow equalizer 5, an inner flue 2 and an outer flue 1 in sequence. The outlet of the outer flue 1 is connected to an external swirl sheet 4, and the outlet of the inner flue 2 is connected to an internal swirl sheet 3. A rotary atomizer 8 is installed on the top of the desulfurization tower 6 for atomizing the desulfurizer slurry;

[0038] The sulfur-containing flue gas enters the top flue gas distributor 7 and the bottom flue 9 through the main flue. The flue gas distributed by the top flue gas distributor 7 enters the desulfurization tower 6 in a rotating motion, reacts chemically with the slurry droplets at the outlet of the atomizer 8, and dries quickly. The bottom flue gas is rectified by the flue through the flow equalizer 5, and evenly enters the outer flue 1 and inner flue 2 of the cyclone distributor, and then enters the desulfurization tower 6 under the action of the outer cyclone sheet 4 and the inner cyclone sheet 3 respectively. Among them, the central airflow formed by the inner flue 2 has a large vertical velocity component, and forms a strong convection with the airflow coming out of the top flue gas distributor 7 around the atomizing wheel, so that the desulfurizer slurry and the flue gas can quickly complete the chemical reaction and heat exchange. Because the outer flue 1 has a large inclination angle of the cyclone sheet and a special trumpet-shaped outlet design, the external airflow has a large cyclone intensity and a better diffusion effect, so that the flue gas and the desulfurizer spray layer formed by the atomizer 8 are mixed more fully, while increasing the residence time of the flue gas in the tower and improving the desulfurization efficiency.

[0039] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A flue gas cyclone distributor for rotary spray desulfurization, comprising an inner flue (2) and an outer flue (1), characterized in that: A cross-shaped bracket (11) is provided in the inner flue (2), and the inner flue (2) is connected and fixed to the outer flue (1) via the bracket (11); a circular flow equalizer (5) is provided at the inlet cross section of the inner flue (2); a plurality of external swirl sheets (4) are provided at equal arcs between the outlet of the inner flue (2) and the outlet of the outer flue (1); a plurality of internal swirl sheets (3) are provided at equal arcs at the outlet of the inner flue (2); and both the external swirl sheets (4) and the internal swirl sheets (3) are used to change the movement state of smoke; The outlet of the external flue (1) is connected to a gradually expanding pipe section, the gradually expanding pipe section is designed in a bell-mouth shape, and the pipe cross-section of the gradually expanding pipe section gradually increases along the flue gas outflow direction; The inlet of the inner flue (2) is connected to a tapered pipe section, and the pipe cross section of the tapered pipe section gradually decreases along the direction of smoke inflow; The external swirl sheet (4) is in a trapezoidal shape, and the short side of the external swirl sheet (4) is connected to the outer wall of the inner flue (2), and the long side of the external swirl sheet (4) is connected to the outlet of the outer flue (1); the internal swirl sheet (3) is in a rectangular shape and is connected to the bracket (11) of the inner flue (2); There is a height difference between the outlets of the outer flue (1) and the inner flue (2), and the outlet of the inner flue (2) is higher than the outlet of the outer flue (1); The inclination angle of the external swirl plate (4) is counterclockwise, the inclination direction of the internal swirl plate (3) is the same as that of the external swirl plate (4), the inclination angle of the external swirl plate (4) is greater than or equal to the inclination angle of the internal swirl plate (3), and the inclination angle of the external swirl plate is 0-45°.

2. A flue gas cyclone distributor for rotary spray desulfurization according to claim 1, characterized in that: The area of ​​the flow equalizer (5) is equal to the bottom inlet area of ​​the external flue (1), and the flow equalizer (5) is composed of a plurality of vertical guide plates (12) arranged at equal arc angles, so as to ensure uniform flow distribution of the smoke entering the cyclone distributor.

3. A flue gas cyclone distributor for rotary spray desulfurization according to claim 1, characterized in that: The external swirl sheets (4) and the internal swirl sheets (3) are evenly distributed along the pipe outlet cross section, and the number of the external swirl sheets (4) and the number of the internal swirl sheets (3) are both 6-18.

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