Efficient dry flue gas desulfurization tower

Abstract

The utility model discloses an efficient dry flue gas desulfurization tower which is internally provided with a front ascending chamber, a descending chamber and a rear ascending chamber which are sequentially communicated in a foldback manner along a flue gas flowing path, a front guide plate assembly is arranged at the turning joint of the front ascending chamber and the descending chamber and on one side of the descending chamber, and a rear guide plate assembly is arranged at the turning joint of the rear ascending chamber and the descending chamber. A front flow guide plate assembly is arranged at the upper end of the ascending bin, a rear flow guide plate assembly is arranged at the outlet turning position of the ascending bin, the front flow guide plate assembly and the rear flow guide plate assembly are symmetrically distributed in the vertical direction, the lower end of the front ascending bin is bent in the horizontal direction to form an inlet flue, the inlet flue is provided with an inlet expansion joint connected with a furnace body smoke pipeline, and a rotational flow plate is arranged in the inlet flue. The upper end of the rear ascending bin is bent in the horizontal direction to form an outlet flue, and the outlet flue is provided with an outlet expansion joint connected with a bag-type dust collector on the downstream of the desulfurizing tower. According to the utility model, the desulfurizing agent and the flue gas can be intensively mixed, the reaction time of the desulfurizing agent and the flue gas is prolonged, the consumption of the desulfurizing agent is saved, and the operation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas desulfurization, in particular to a high-efficiency dry flue gas desulfurization tower which can improve the mixing uniformity of flue gas and a desulfurizing agent, increase the reaction time and improve the desulfurization efficiency. Background Art

[0002] At present, when desulfurizing the flue gas from steel rolling heating furnaces, blast furnace hot blast furnaces, lime kilns, etc. involved in the steel industry, the dry flue gas desulfurization process is commonly used, and the desulfurizers are often sodium bicarbonate and highly active calcium hydroxide. The principle is: sodium bicarbonate powder (or highly active calcium hydroxide powder) with a particle size of about 700 mesh is sprayed into the flue through a spray gun, reacting with SO2 in the flue gas to generate Na2SO3 (or CaSO3). The purified flue gas is dedusted by a bag filter and discharged from the chimney through an induced draft fan.

[0003] Many hot blast furnaces and heating furnaces were not equipped with flue gas desulfurization facilities at the initial stage of construction. Therefore, when carrying out dry desulfurization transformation, the problems often encountered are tight site, compact equipment layout, short flue, which leads to uneven mixing of flue gas and desulfurizer, short reaction time and low desulfurization efficiency. In order to improve the desulfurization efficiency, the method often used is to increase the sodium-sulfur ratio (or calcium-sulfur ratio) and spray excessive desulfurizer, resulting in waste of desulfurizer. Utility Model Content

[0004] In view of the technical problems existing in the prior art, the utility model provides a high-efficiency dry flue gas desulfurization tower, which has a reasonable structural design, a small footprint and a high desulfurization efficiency.

[0005] In order to achieve the above technical purpose, the technical solution adopted by the utility model is as follows:

[0006] A high-efficiency dry flue gas desulfurization tower, the interior of the desulfurization tower is provided with a front ascending chamber, a descending chamber and a rear ascending chamber which are connected in a turn-back manner in sequence along the flow path of the flue gas, a front guide plate assembly is provided on one side of the descending chamber at the turning connection of the front ascending chamber and the descending chamber, and a rear guide plate assembly is provided at the outlet turning of the ascending chamber, the front guide plate assembly and the rear guide plate assembly are symmetrically distributed in the vertical direction, an inlet flue is bent in the horizontal direction at the lower end of the front ascending chamber, an inlet expansion joint connected to the flue gas duct of the furnace body is provided at the mouth of the inlet flue, a swirl plate is provided inside the inlet flue, an outlet flue is bent in the horizontal direction at the upper end of the rear ascending chamber, and an outlet expansion joint connected to a bag filter downstream of the desulfurization tower is provided at the mouth of the outlet flue.

[0007] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the front guide plate assembly and the rear guide plate assembly have the same structure, both comprising a plurality of arc-shaped guide plates having the same radius of curvature and gradually increasing arc lengths, and the inner arc surface of the arc-shaped guide plate faces the center of the bend.

[0008] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the inlet flue is provided with a first manhole on the downstream side of the swirl plate, and a second manhole is provided at the turning connection between the descending chamber and the rear ascending chamber.

[0009] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the front ascending chamber, the descending chamber and the rear ascending chamber are all vertical chambers.

[0010] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the cavity diameters of the front ascending chamber, the descending chamber and the rear ascending chamber are the same.

[0011] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the heights of the front ascending chamber, the descending chamber and the rear ascending chamber are the same.

[0012] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the swirl plate includes a central disk and a plurality of arc plates radiating outward from the disk edge of the central disk, the arc plates have a side deviation angle, and flue gas swirl channels are formed between adjacent arc plates.

[0013] The beneficial effects of the utility model are as follows: the desulfurization tower of the utility model has a small equipment footprint and a high outlet position, which is more convenient for connecting with the inlet of the bag filter downstream of the desulfurization tower. The inlet flue is provided with a swirl plate, which is more conducive to the strong mixing of the desulfurizer and the flue gas. The desulfurizer and the flue gas flow back and forth inside the desulfurization tower, which increases the reaction time of the desulfurizer and the flue gas and improves the desulfurization efficiency, so that a lower sodium-sulfur ratio (or calcium-sulfur ratio) can meet the SO 2 Emission standards, save desulfurization agent consumption and reduce operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model;

[0015] Figure 2 for Figure 1 Sectional view at "AA" in the figure;

[0016] Figure 3 for Figure 1 Sectional view at "BB" in the middle;

[0017] Figure 4 It is a schematic diagram of the smoke cyclone channel formed between adjacent arc-shaped plates in the cyclone plate of the utility model. DETAILED DESCRIPTION

[0018] In order to further understand the present invention, the present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0019] In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or a connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] See also Figure 1 and Figure 2 As shown in the figure, the embodiment of the utility model proposes a high-efficiency dry flue gas desulfurization tower, the interior of the desulfurization tower is provided with a front rising chamber 1, a descending chamber 2 and a rear rising chamber 3 which are connected in a folding manner along the flow path of the flue gas (as shown by the dotted arrow in the figure). The flue gas is folded back inside the desulfurization tower, which increases the reaction time between the desulfurizer and the flue gas, thereby improving the desulfurization efficiency. Figure 1 As shown, at the turning connection of the front ascending chamber 1 and the descending chamber 2, a front deflector assembly 6 is provided on one side of the descending chamber 2, and a rear deflector assembly 7 is provided at the outlet turning of the ascending chamber 3. The front deflector assembly 6 and the rear deflector assembly 7 are symmetrically distributed in the vertical direction, which can effectively guide the smoke at the turning point to avoid the backflow at the corner to form resistance. The front deflector assembly 6 and the rear deflector assembly 7 can effectively reduce the resistance of the smoke system. Figure 1 As shown, the lower end of the front rising chamber 1 is bent horizontally to form an inlet flue 4, and the mouth of the inlet flue 4 is provided with an inlet expansion joint 8 connected to the flue gas pipeline of the furnace body. The desulfurization tower of the utility model can be sealed and connected with the original flue gas pipeline of the heating furnace and the hot blast furnace through the inlet expansion joint 8. In order to make the desulfurizer and the flue gas mix evenly, as shown in FIG. Figure 1As shown, a swirl plate 9 is provided inside the inlet flue 4. Under the action of the swirl plate 9, the desulfurizer and flue gas entering the inlet flue 4 can be strongly disturbed, so that the two are fully mixed. Figure 1 As shown, the upper end of the rear rising chamber 3 is bent horizontally to form an outlet flue 5, and the mouth of the outlet flue 5 is provided with an outlet expansion joint 10 connected to the bag filter downstream of the desulfurization tower. The outlet flue 5 is arranged at the upper end of the rising chamber 3, and is located at a higher position, so that the inlet of the bag filter downstream of the desulfurization tower can be easily connected to the outlet expansion joint 10.

[0022] Further, in a preferred embodiment of the present invention, Figure 1 As shown, the front guide plate assembly 6 and the rear guide plate assembly 7 have the same structure, and both include a plurality of arc-shaped guide plates with the same radius of curvature and gradually increasing arc lengths. Specifically, the inner arc surface of each arc-shaped guide plate faces the center of the bend, and the flue gas can be guided to the next flow path by the arc-shaped guide plate when passing through the bend, so as to avoid the flue gas concentrating at the corner to form a convergent backflow. Under the guiding effect of the front guide plate assembly 6 and the rear guide plate assembly 7, the flow resistance of the flue gas in the internal channel of the desulfurization tower is reduced.

[0023] Further, in a preferred embodiment of the present invention, Figure 1 As shown, the inlet flue 4 is provided with a first manhole 11 at the downstream side of the swirl plate 9, and a second manhole 12 is provided at the turning connection between the descending chamber 2 and the rear ascending chamber 3. The first manhole 11 and the second manhole 12 can provide convenience for maintenance. During maintenance, the maintenance work can be carried out at the corner near the ground inside the desulfurization tower through the corresponding manhole.

[0024] Further, in a preferred embodiment of the present invention, Figure 1 As shown, the front rising chamber 1, the descending chamber 2 and the rear rising chamber 3 are all chambers in the vertical direction. The cavity diameters of the front rising chamber 1, the descending chamber 2 and the rear rising chamber 3 are the same, and the heights of the front rising chamber 1, the descending chamber 2 and the rear rising chamber 3 are the same. By adopting the above structural design, the equipment footprint is reduced, the flue gas passage path is extended, the reaction time of the flue gas and the desulfurizer is increased, and the desulfurization efficiency is improved.

[0025] Further, in a preferred embodiment of the present invention, Figure 3 and Figure 4As shown, the swirl plate 9 includes a central disk 91 and a plurality of arc plates 92 radiating outward from the edge of the central disk 91, wherein the arc plates 92 have a side angle, and flue gas swirl channels 93 are formed between adjacent arc plates 92. After the flue gas and the desulfurizer enter the inlet flue 4, they can generate strong disturbances through the swirl plate 9, so that the desulfurizer and the flue gas are strongly mixed and mixed more fully. In the subsequent process of passing through the front rising chamber 1, the descending chamber 2 and the rear rising chamber 3, the desulfurizer and the flue gas flow back and forth inside the desulfurization tower, which increases the reaction time of the desulfurizer and the flue gas and improves the desulfurization efficiency, so that a lower sodium-sulfur ratio (or calcium-sulfur ratio) can meet the SO 2 Emission standards can save desulfurization agent consumption and reduce operating costs.

[0026] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and the specification only describe the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected, and the scope of protection required by the utility model is defined by the attached claims and their equivalents.

Claims

1. A high-efficiency dry flue gas desulfurization tower, characterized in that: A front ascending chamber (1), a descending chamber (2) and a rear ascending chamber (3) are provided along the flue gas flow path, which are connected in a folding manner in sequence. A front guide plate assembly (6) is provided at a turning point between the front ascending chamber (1) and the descending chamber (2) on one side of the descending chamber (2). A rear guide plate assembly (7) is provided at the outlet turning point of the ascending chamber (3). The front guide plate assembly (6) and the rear guide plate assembly (7) are symmetrically distributed in the vertical direction. An inlet flue (4) is bent in the horizontal direction at the lower end of the front ascending chamber (1). An inlet expansion joint (8) connected to a flue gas duct of a furnace body is provided at the mouth of the inlet flue (4). A swirl plate (9) is provided inside the inlet flue (4). An outlet flue (5) is bent in the horizontal direction at the upper end of the rear ascending chamber (3). An outlet expansion joint (10) connected to a bag filter downstream of the desulfurization tower is provided at the mouth of the outlet flue (5).

2. The high-efficiency dry flue gas desulfurization tower according to claim 1, characterized in that: The front deflector assembly (6) and the rear deflector assembly (7) have the same structure, and both comprise a plurality of arc-shaped deflectors having the same radius of curvature and gradually increasing arc lengths, wherein the inner arc surfaces of the arc-shaped deflectors face the center of the bend.

3. The high-efficiency dry flue gas desulfurization tower according to claim 1 is characterized in that: The inlet flue (4) is provided with a first manhole (11) at the downstream side of the swirl plate (9), and a second manhole (12) is provided at the turning connection between the descending chamber (2) and the rear ascending chamber (3).

4. The high-efficiency dry flue gas desulfurization tower according to claim 1, characterized in that: The front ascending chamber (1), the descending chamber (2) and the rear ascending chamber (3) are all chambers in a vertical direction.

5. The high-efficiency dry flue gas desulfurization tower according to claim 1, characterized in that: The cavity diameters of the front ascending chamber (1), the descending chamber (2) and the rear ascending chamber (3) are the same.

6. The high-efficiency dry flue gas desulfurization tower according to claim 1, characterized in that: The front ascending chamber (1), the descending chamber (2) and the rear ascending chamber (3) are of the same height.

7. The high-efficiency dry flue gas desulfurization tower according to claim 1, characterized in that: The swirl plate (9) comprises a central disk (91) and a plurality of arc-shaped plates (92) radiating outwards along the disk edge of the central disk (91); the arc-shaped plates (92) have a side deviation angle, and smoke swirl channels (93) are formed between adjacent arc-shaped plates (92).

Images