CN203990103U - A kind of fume desulfurizing tower chimney - Google Patents

Abstract

The utility model provides a kind of fume desulfurizing tower chimney, it is characterized in that, comprise chimney body, deflector and/or demister, described chimney body comprises conical section and direct tube section, the big opening end of described conical section is connected with the tower body of described fume desulfurizing tower, the osculum end of described conical section is connected with described direct tube section, and described deflector and/or demister are arranged on the flue of direct tube section of described chimney body.The fume desulfurizing tower chimney that the utility model provides, owing to having increased spiral demister and double end deflector structure, not only can strengthen flue gas mass transfer and improved simultaneously desulfurizer mist eliminator except fog effect, to solving acid rain and emitting white cigarette problem significant.

Description

A flue gas desulfurization tower chimney

technical field

The utility model relates to a chimney, in particular to a chimney used in a flue gas desulfurization tower.

Background technique

Flue gas desulfurization is the most commonly used means to suppress sulfur dioxide pollution and reduce acid rain. Spray desulfurization tower is the core equipment of flue gas wet desulfurization technology. Common main equipment in the desulfurization system are desulfurization absorption tower, flue, chimney, desulfurization pump, booster fan and other main equipment. In the past, the research on flue gas desulfurization system was mainly focused on the chemical reaction process conditions, and the influence of equipment structure on desulfurization efficiency was rarely considered. In the existing research, the structure of the desulfurization tower has been improved, but the influence of the chimney is rarely considered. .

The flue gas enters the tower from the bottom of the desulfurization tower, and encounters the desulfurization agent droplets sprayed by the spray layer during the rising process. The desulfurization agent and the sulfur-containing flue gas contact and react to desulfurize the flue gas. After the flue gas is sprayed, it carries a large amount of liquid droplets, and some of the liquid droplets that have not been removed will be discharged through the chimney after demisting by the demister. Due to the limited desulfurization efficiency of the desulfurization tower, a part of the sulfur in the flue gas will form acid rain, and a large amount of fog droplets may be entrained in the flue gas, and the atomization of the fog droplets will cause common problems such as white smoke from the chimney.

Due to the limited desulfurization efficiency of the desulfurization tower, a part of the sulfur in the flue gas will form acid rain, and a large amount of mist may be entrained in the flue gas, and the atomization of the mist will cause common problems such as white smoke from the chimney. Through actual engineering investigation and theoretical research, it is found that the structure of the chimney has an important impact on reducing acid rain and solving problems such as white smoke from the chimney.

Utility model content

In view of this, the purpose of this utility model is to provide a chimney used in a flue gas desulfurization tower to further remove liquid droplets in the flue gas flowing through the chimney.

The flue gas desulfurization tower chimney provided by the utility model is characterized in that it includes a chimney body, a deflector and/or a mist eliminator, the chimney body includes a conical section and a straight section, and the large mouth end of the conical section is connected to the The tower body of the flue gas desulfurization tower is connected, the small mouth end of the tapered section is connected with the straight section, and the deflector and/or demister are installed on the chimney of the straight section of the chimney body. on the road.

Further, the deflector is a spiral deflector; the demister is a spiral demister.

Further, the spiral deflector and the spiral demister are sequentially installed on the flue of the straight section of the chimney body, and the spiral deflector and the spiral demister are in the same direction of rotation.

Further, the deflector includes two symmetrically placed spiral deflector bodies.

Further, the two spiral deflector bodies have the same rotation direction.

Further, the plate width of the spiral deflector body is 0.7-1.2 meters, the pitch is 6-8 meters, the overall height is 8-12 meters, and its outer diameter is the same as the inner diameter of the chimney body; the spiral guide The projection of the plate body on a plane perpendicular to its longitudinal axis forms a complete circle.

Further, the mist eliminator includes a main shaft and vanes, the vanes are elongated narrow plates, one end of which is fixed on the outer wall of the main shaft, and the outer diameter of the mist eliminator is the same as the inner diameter of the chimney body.

Further, the plane where the blades are located forms an angle of 45 degrees with the longitudinal axis of the chimney body.

Further, the length and diameter of the main shaft are both 0.8-1.2 meters, and the thickness of the blades is 0.08-1.2 meters.

In the chimney of the flue gas desulfurization tower provided by the utility model, by changing the internal structure of the chimney, not only can the internal flow field of the chimney rise in a spiral manner, but also make up for the shortcoming of the limited demisting efficiency in the desulfurization tower to a large extent, and through different The simulation analysis under the screw pitch and speed finds an optimal device to improve the mist removal performance and efficiency, reduce the formation of acid rain and the problem of white smoke from the chimney; and, due to the addition of the spiral mist eliminator and double-head deflector structure , not only can strengthen the flue gas mass transfer but also improve the demisting effect of the desulfurization tower demister at the same time, which is of great significance to solve the problems of acid rain and white smoke.

Description of drawings

Through the following description of the embodiments of the utility model with reference to the accompanying drawings, the above-mentioned and other purposes, features and advantages of the utility model will be more clear, in the accompanying drawings:

Fig. 1 is the overall structural representation of chimney of the present utility model;

Fig. 2 is a schematic diagram of the overall structure of the deflector of the present utility model;

Fig. 3 is the top view of Fig. 2;

Fig. 4 is a schematic diagram of the overall structure of the mist eliminator of the present invention.

Detailed ways

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.

As shown in FIG. 1 , the chimney 100 of the present invention includes a chimney body 1 , a deflector 2 and a mist eliminator 3 . The chimney body 1 includes a conical section 11 and a straight section 12 , the large end of the conical section 11 is connected to the tower body of the desulfurization tower, and the small end of the conical section 11 is connected to the straight section 12 . The deflector 2 and the mist eliminator 3 are successively installed on the flue of the straight section 12 of the chimney body 1, and the installation positions of the deflector 2 and the mist eliminator 3 can be interchanged; The mist eliminator 3 and the chimney body 1 are fixed by a conventional fixing method, such as spot welding and the like. In one embodiment, the total height of the chimney body 1 is 46m, the mist eliminator 3 is installed at a position 20m away from the bottom of the chimney body 1, and the deflector 2 is installed at a position 25m away from the bottom of the chimney body 1. Location.

As shown in FIG. 2 and FIG. 3 , the deflector 2 is a double helical deflector, including two symmetrically placed spiral deflector bodies 21 , 22 . The helical deflector bodies 21 and 22 have the same helical direction, and can be left-handed or right-handed at the same time. In a preferred embodiment, the diameter of the chimney body is 6.5 meters, the plate width of the spiral deflector body 21, 22 is 0.9 meters, the pitch is 7 meters, and the overall height is 10 meters. The inner diameters of the chimney bodies 1 are the same. The projections of the spiral deflector bodies 21 and 22 on a plane perpendicular to their longitudinal axes form a complete circle, as shown in FIG. 3 .

As shown in FIG. 4 , the demister 3 includes a main shaft 31 and blades 32 . The blades 32 are elongated narrow plates, there are multiple, preferably 6, one end of which is evenly distributed on the outer wall of the main shaft 31 . The plane where the blades 32 are located forms a certain angle α with the longitudinal axis of the chimney body 1 , preferably, the angle α is 45 degrees. The outer diameter of the mist eliminator 3 is the same as the inner diameter of the chimney body 1 . A plurality of inclined blades 32 form a helical demister with a helical direction. In a preferred embodiment, the length and diameter of the main shaft 31 are both 1 meter, and the blade thickness is 0.1 m.

In the utility model, the arrangement of the demister 3 and the deflector 2 makes the running track of the flue gas in the chimney body 1 spiral upward, so as to further remove the mist carried in the flue gas. The mist eliminator 3 and the double-head deflector 2 can be rotated in the same direction or in the opposite direction when they are assembled, and different directions of rotation have a certain influence on defogging. When the direction of rotation is the same, there is only one vortex, and when the direction of rotation is opposite, there are two relatively large vortexes. The same speed is more uniform than that of the opposite direction, and the demisting efficiency of the same direction of rotation is 10% higher than that of the opposite direction of rotation. The outlet pressure difference is also smaller than that of the opposite direction of rotation. Preferably, the direction of rotation of the mist eliminator 3 and the deflector 2 is selected to be the same.

Using the method of computational fluid dynamics, the numerical simulation is carried out on the internal flow field of the chimney without mist eliminator and deflector in the prior art and the chimney in the utility model. In the chimney in the prior art, the flue gas enters the chimney vertically from the conical section of the chimney body, the pressure at the entrance of the conical section is the highest, the pressure gradually decreases from bottom to top, and the pressure in the straight section of the chimney basically remains unchanged, and the pressure difference between the inlet and outlet Smaller, the chimney in the prior art has no removal effect on the mist entrained by the flue gas; different from the flue gas in the prior art entering the chimney vertically from the conical section, the chimney in the utility model, the flue gas enters the chimney from the conical section After the chimney, it contacts with the mist eliminator 3 and rises in a spiral airflow, which can effectively remove the mist droplets, and because of the presence of the mist eliminator, the pressure difference between the inlet and outlet increases.

In the chimney of the prior art, the gas velocity direction points to the center of the chimney, while the gas velocity of the chimney in the utility model makes a circular motion around the chimney wall, so that the smoke can be in good contact with the wall surface to achieve the effect of demisting.

Chimneys equipped with mist eliminators have turbulent flow that removes most of the mist entrained in the flue gas. The flue gas in the chimney with the same swirling demister 3 and deflector 2 will form a vortex, and the flue gas in the chimney with the opposite swirling demister 3 and deflector 2 will form two swirls. The larger the vortex, the same than the opposite speed is more uniform, and the demist efficiency of the same direction of rotation is 10% higher than that of the opposite direction of rotation, and the pressure difference between the inlet and outlet is also smaller than that of the opposite direction of rotation. Both are closer to the center of the circle, the greater the speed, and the speed decreases along the radius direction.

The utility model respectively simulates the flow field of the chimney with only the mist eliminator 3 and the flow field with only the deflector 2 . The flue gas enters the chimney from the conical section 11, first enters the mist eliminator 3, makes the flue gas have a certain deflection angle and removes a part of the mist, and then enters the deflector 2 to form a spiral air flow through the deflector. Adding the deflector 2 will disturb the flow field more than adding the demister 3, and the demisting efficiency of only the deflector 2 is higher than that of the demister 3 through simulation calculations. The pressure difference is small, and changing the pitch is less difficult to simulate than changing the number of blades of the demister 3, so the demisting efficiency can be changed by changing the pitch. The demisting efficiency shows a trend of first increasing and then decreasing with the increase of the screw pitch. The maximum efficiency is in the range of 6m-8m, and the pressure difference between the inlet and outlet decreases with the increase of the screw pitch. The influence of the flue gas velocity factor on the demisting efficiency and the pressure difference between the inlet and outlet. The demisting efficiency increases with the increase of the speed, and the pressure difference between the inlet and outlet also increases with the increase of the speed.

Compared with the prior art, the utility model can not only realize the spiral rising of the flow field inside the chimney by changing the internal structure of the chimney, but also make up for the shortcoming of the limited demisting efficiency in the desulfurization tower to a large extent, and by changing the internal structure of the chimney The simulation analysis finds an optimal device to improve the demist performance and demist efficiency, and reduce the formation of acid rain and white smoke from the chimney.

Finally, it should be noted that obviously, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims (9)

1. A flue gas desulfurization tower chimney, is characterized in that, comprises chimney body, deflector and/or mist eliminator, and described chimney body comprises conical section and straight tube section, and the large mouth end of described conical section is connected with all The tower body of the flue gas desulfurization tower is connected, the small mouth end of the tapered section is connected with the straight section, and the deflector and/or demister are installed on the flue of the straight section of the chimney body . 2. The chimney according to claim 1, wherein the deflector is a spiral deflector; the demister is a spiral demister. 3. The chimney according to claim 2, wherein the spiral deflector and the spiral mist eliminator are sequentially installed on the flue of the straight section of the chimney body, and the spiral deflector and the spiral defogger The direction of rotation of the device is the same. 4. The chimney according to claim 1 or 3, characterized in that the deflector comprises two symmetrically placed spiral deflector bodies. 5. The chimney according to claim 4, characterized in that, the two spiral deflector bodies have the same rotation direction. 6. The chimney according to claim 5, characterized in that, the plate width of the spiral deflector body is 0.7-1.2 meters, the pitch is 6-8 meters, the overall height is 8-12 meters, and its outer diameter is the same as The inner diameters of the chimney bodies are the same; the projection of the spiral deflector body on a plane perpendicular to its longitudinal axis forms a complete circle. 7. The chimney according to claim 1 or 3, wherein the mist eliminator comprises a main shaft and vanes, the vanes are elongated narrow plates, one end of which is fixed on the outer wall of the main shaft, the The outer diameter of the mist eliminator is the same as the inner diameter of the chimney body. 8 . The chimney according to claim 7 , wherein the plane where the vanes are located forms an angle of 45 degrees with the longitudinal axis of the chimney body. 9. The chimney according to claim 8, characterized in that the length and diameter of the main shaft are both 0.8-1.2 meters, and the thickness of the blades is 0.08-1.2 meters.