CN103566664B - Flue gas of sintering machine demister - Google Patents

Abstract

The invention provides a kind of flue gas of sintering machine demister, belong to gas-liquid separation technical field.Flue gas of sintering machine demister comprises the cylindrical chimney at the bottom of being provided with tin and the multilayer demisting unit axially evenly arranged along chimney, the demisting unit of every layer is evenly arranged along the circumference of chimney, the barrel of chimney arranges multirow opening vertically, and multilayer demisting unit is corresponding with the multirow opening on chimney wall to be respectively communicated with.Desulfurization demister provided by the invention improves the dust removing effects of desulfurizing tower, reduces the concentration containing solid-liquid in wet desulphurization tower discharged gas fume, and improves the desulfuration efficiency of desulfurizing tower further.

Description

Sintering machine flue gas desulfurization and demisting device

technical field

The invention provides a sintering machine flue gas desulfurization and demisting device, which belongs to the technical field of gas-liquid separation.

Background technique

Flue gas desulfurization is an environmental protection measure that coal-fired power plants, petrochemical enterprises, and iron and steel enterprises must implement at present, and wet desulfurization towers are usually used for desulfurization. At present, folded plate demisters are commonly used in desulfurization towers, which have the disadvantage of high moisture content in the net flue gas at the outlet. When the relative humidity of the air in the factory area is high, the liquid droplets carried by the net flue gas will gradually grow with the condensation of water vapor. , and finally fall to the ground, forming "gypsum rain". Especially in winter and in the south, the phenomenon of "gypsum rain" is relatively common.

The liquid droplets contained in the wet flue gas after desulfurization have basically the same composition as the slurry at the bottom of the tower, which contains a certain concentration of dust and SO ₂ ; the higher the total amount of liquid droplets contained in the clean flue gas, the higher the The lower the dust removal efficiency, the lower the desulfurization efficiency. At present, the country has more and more strict requirements on the concentration and total emission of air pollutants. Pollutant discharge enterprises must increase the desulfurization rate and dust removal rate of desulfurization devices; in addition to increasing the liquid-gas ratio of desulfurization towers and the activity of desulfurizers, improve The separation efficiency is also a very important method.

The desulfurization method adopted by most desulfurization devices is: limestone-gypsum desulfurization method. This method can remove sulfur dioxide in the flue gas to a large extent, but it also brings many problems at the same time. This method consumes a large amount of process water, wherein most of the process water is discharged into the atmosphere in the form of water vapor, and a small part is discharged into the atmosphere in the form of liquid droplets; near the chimney outlet, as the temperature decreases, the water vapor condenses into a liquid state, and The presence of droplets accelerates the condensation process, causing the droplets to grow rapidly and form rainfall near the chimney. As a result, certain secondary pollution will be caused to the environment around the desulfurization tower. Therefore, reducing the concentration of liquid droplets in the net flue gas can avoid the chimney with rain and reduce the impact on the surrounding environment of the desulfurization tower. At present, my country still has a relatively large number of small and medium-sized boilers in operation, and it is unrealistic to invest in large environmental governance. Therefore, some high-efficiency, low-cost equipment needs to be developed and developed. How to remove the liquid droplets in the flue gas has become the top priority of research.

The existing demister has a folded plate demister, which has the problem of insufficient droplet removal efficiency, and has a relatively large limit on the flue gas flow rate. During long-term operation, there is also the phenomenon of dust accumulation in some areas, which reduces the efficiency of the demister. work efficiency.

Contents of the invention

In order to overcome the technical problems existing in the prior art, the purpose of the invention is to provide a sintering machine flue gas desulfurization and demisting device, which has a high efficiency of removing liquid droplets.

In order to achieve the purpose of the invention, the present invention provides a sintering machine flue gas desulfurization and defogging device, which includes a cylindrical chimney with a bottom and multi-layer demisting units uniformly arranged along the axial direction of the chimney. The demisting units are evenly arranged along the circumference of the chimney, and the wall of the chimney is provided with multiple rows of openings in the axial direction, and the multi-layer demisting units communicate with the multiple rows of openings on the wall of the chimney respectively.

Preferably, the demisting unit includes a cylinder, the lower end of which is provided with a bottom, the upper end is a clean flue gas outlet, and the side wall of the cylinder is radially provided with a wet flue gas inlet and a flushing water interface, A drain port is arranged along the axial direction.

Preferably, the cylinder has a diameter of and a height of The diameter of the first cylindrical cylinder of the upper bottom opening is , the diameter of the lower opening is and a height of A frustoconical cylinder with a diameter of and a height of The second cylindrical barrel is composed of the second cylindrical barrel, and the discharge port is arranged at the transition of the first cylindrical barrel and the frustum of conical barrel.

Preferably, the vertical axial section of the wet flue gas inlet is trapezoidal, wherein the extension line of one waist of the trapezoid is tangent to the circle formed by the radial section of the first cylindrical barrel and is perpendicular to the bottom edge, and the other The waist intersects the circle formed by the radial section of the first cylindrical barrel and forms a certain angle with the bottom edge.

Compared with the prior art, the flue gas desulfurization and demisting device of the sintering machine provided by the present invention improves the dedusting effect of the desulfurization tower, reduces the concentration of solid-containing liquid droplets in the flue gas discharged from the wet desulfurization tower, and further improves the desulfurization efficiency of the desulfurization tower , to overcome the deficiencies of the existing folding plate demister. The device has the advantages of simple structure, convenient processing, convenient installation and the like.

Description of drawings

Figure 1A is a schematic cross-sectional view along the axial direction of the sintering machine flue gas desulfurization and mist removal device provided by the present invention;

Figure 1B is a schematic cross-sectional view along the vertical axis of the flue gas desulfurization and demisting device for sintering machine provided by the present invention;

Fig. 2A is a radial perspective view of the defogging unit provided by the present invention;

Fig. 2B is a perspective view of the defogging unit provided by the present invention viewed from direction A;

Fig. 2C is a cross-sectional view of the defogging unit provided by the present invention along the B-B direction.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings, and the same reference numerals represent the same components.

Figure 1A is a schematic cross-sectional view of the flue gas desulfurization and mist removal device for sintering machines provided by the present invention along the axial direction; Figure 1B is a schematic cross-sectional view of the flue gas desulfurization and mist removal device for sintering machines provided by the present invention along the vertical axis. As shown in Figures 1A and 1B, the flue gas desulfurization and demisting device for sintering machine provided by the present invention includes a cylindrical chimney 2 with a bottom and multi-layer demisting units 3 uniformly arranged along the axial direction of the chimney 2, each layer The demisting unit is evenly arranged along the circumference of the chimney, and the wall of the chimney is provided with multiple rows of openings in the axial direction, and the first opening of each row is arranged radially; the multi-layer demisting units communicate with the multiple rows of openings on the chimney wall respectively . The mist removal device is arranged on the top of the desulfurization tower 1 .

Figure 2A is a radial perspective view of the defogging unit provided by the present invention; Figure 2B is a perspective view of the defogging unit provided by the present invention viewed from the direction A; Figure 2C is a cross-sectional view of the defogging unit provided by the present invention along the B-B direction . As shown in Figures 2A, 2B and 2C, the demister unit 3 includes a cylinder 9, the lower end of the cylinder is provided with a bottom, the upper end is a clean flue gas outlet 4, and the side wall of the cylinder is arranged radially There is a wet flue gas inlet 7 and a flushing water interface 6, and a drain port 8 is arranged in the axial direction; the clean flue gas outlet 4 is provided with a mounting flange 5, and the mounting flange 5 is connected to the opening of the side wall of the chimney by bolts .

Cylinder 9 has a diameter of and a height of The diameter of the first cylindrical cylinder of the upper bottom opening is , the diameter of the lower opening is and a height of A frustoconical cylinder with a diameter of and a height of Composed of the second cylindrical barrel, the drain 8 is arranged at the transition of the first cylindrical barrel and the frustum of conical barrel.

The vertical axial section of the wet flue gas inlet 7 is trapezoidal, wherein the extension line of one waist of the trapezoid is tangent to the circle formed by the radial section of the first cylindrical barrel and is perpendicular to the bottom edge, and the other waist is perpendicular to the bottom edge. The circle formed by the radial section of the first cylindrical cylinder intersects and forms a certain angle with the bottom edge.

The working process of the demisting device provided by the present invention is as follows: the desulfurized wet flue gas enters the cylinder body of the demisting unit from the wet flue gas inlet 1 of each demisting unit, and the flushing water enters from the flushing port 6 at the same time. One surface of the inlet 1 is tangent to the wall of the cylinder, and the other surface intersects with the wall of the cylinder, so that the flue gas moves in a spiral shape when it flows inside the cylinder, and the flushing water also moves in a spiral shape with the pipe wall. In this way, the solid impurities on the pipe wall can be flushed, the fouling of the pipe wall can be reduced, and the equipment can operate normally for a long time. The wet flue gas generates centrifugal force during the movement of the cylinder. Under the action of the centrifugal force, the liquid droplets in the flue gas will adhere to the inner wall surface of the cylinder, and flow down along the inner wall surface of the cylinder under the action of the droplet's own gravity. , and then discharged through the drain port 8, so that the purified flue gas is discharged into the chimney through the net flue gas outlet 4, and then discharged to the outside world through the outlet on the upper part of the chimney.

The demisting unit provided by the present invention makes the flue gas spiral forward in the demisting unit, makes the moisture in the flue gas adhere to the inner wall of the cylinder body of the demisting unit under the action of centrifugal force, and recover by gravity. The flue gas spirally advances in the demisting unit to further reduce the solid particles in the flue gas, reduce the liquid droplet content in the flue gas, and also reduce the operating cost of the desulfurization system. The mist removal units are arranged in a ring in the flue, which improves the water removal rate of the flue gas as much as possible. The treated flue gas can be directly discharged into the atmosphere. The water discharged through the drain can be recycled and reused, further reducing the operating cost of the equipment.

Although the concept and examples of the present invention have been described in detail above in conjunction with the accompanying drawings, those skilled in the art should recognize that any improvement and transformation made based on the present invention still belong to the protection of the present invention without departing from the concept of the present invention. content within the range.

Claims (3)

1. a flue gas of sintering machine demister, it is characterized in that, it comprises the cylindrical chimney at the bottom of being provided with tin and the multilayer demisting unit axially evenly arranged along chimney, the demisting unit of every layer is evenly arranged along the circumference of chimney, the barrel of chimney arranges multirow opening vertically, multilayer demisting unit is corresponding with the multirow opening on chimney wall to be respectively communicated with, described demisting unit comprises cylindrical shell, the lower end of described cylindrical shell is provided with the end, upper end is neat stress outlet, the sidewall of cylindrical shell is disposed radially wet flue gas import and flushing water interface, be provided with discharge outlet vertically, neat stress outlet is provided with mounting flange, described mounting flange is bolted the opening part of the barrel in chimney.

2. flue gas of sintering machine demister according to claim 1, is characterized in that, cylindrical shell by diameter is be highly the first cylindrical tube, the diameter of upper bottom portion opening is , lower openings diameter be be highly truncated cone cylinder and diameter be be highly second cylindrical tube composition, discharge outlet is arranged on the transition position of the first cylindrical tube and truncated cone cylinder.

3. flue gas of sintering machine demister according to claim 2, it is characterized in that, the cross section of described wet flue gas import vertical axial is trapezoidal, wherein, the extended line of a trapezoidal waist and the first cylindrical tube radial section and the circle formed tangent and and base vertical, the circle that another waist is formed with the first cylindrical tube radial section is crossing and at a certain angle with base shape.