Efficient dry flue gas desulfurization tower

Abstract

The utility model discloses an efficient dry flue gas desulfurization tower which comprises a vertically arranged desulfurization tower, an inlet flue used for communicating a furnace body original flue gas pipeline and the desulfurization tower is arranged on the side portion, close to the bottom, of the desulfurization tower, an inlet expansion joint used for pipeline butt joint is arranged at a pipe opening of the inlet flue, and the desulfurization tower is a straight barrel-shaped tower body. The top of the tower body is connected with a venturi contraction section, the top of the venturi contraction section is connected with a venturi straight pipe section, the top of the venturi straight pipe section is connected with a venturi diffusion section, the venturi diffusion section is sleeved with a cover cap, the upper section of the venturi straight pipe section is located in the cover cap, and a rotational flow plate is arranged between the cover cap and the venturi straight pipe section. The inner diameter edge of the rotational flow plate is connected with the venturi straight pipe section, and an outlet flue connected with a downstream bag-type dust collector is formed in the side portion, close to the bottom of the cover cap, of the cover cap. The desulfurization tower disclosed by the utility model is small in occupied area, suitable for the transformation of desulfurization projects with tense sites, and capable of obviously saving the consumption of a desulfurizing agent and reducing the operating cost.

Description

Technical Field

[0001] This utility model relates to the field of flue gas desulfurization technology, specifically to a high-efficiency dry flue gas desulfurization tower that occupies a small area and can significantly save on desulfurizing agent consumption. Background Technology

[0002] Currently, the dry flue gas desulfurization process is commonly used for desulfurization of flue gas from steel rolling furnaces, blast furnace hot blast stoves, and lime kilns in the steel industry. Sodium bicarbonate and highly active calcium hydroxide are commonly used as desulfurizing agents. The principle is as follows: sodium bicarbonate powder (or highly active calcium hydroxide powder) with a particle size of approximately 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 then filtered by a bag filter and discharged from the chimney by an induced draft fan.

[0003] Many hot blast stoves and heating furnaces were not equipped with flue gas desulfurization facilities during their initial construction. Therefore, when retrofitting with dry desulfurization systems, common problems include limited space, compact equipment layout, and short flue ducts. This leads to uneven mixing of flue gas and desulfurizing agent, short reaction times, and low desulfurization efficiency. To improve desulfurization efficiency, a common method is to increase the sodium-sulfur ratio (or calcium-sulfur ratio), resulting in excessive injection of desulfurizing agent and wasting it. Utility Model Content

[0004] To address the problems existing in the above-mentioned technologies, this utility model provides a high-efficiency dry flue gas desulfurization tower that occupies a small area and can significantly save on desulfurizing agent consumption.

[0005] The technical solution adopted by this utility model to achieve the above-mentioned technical effects is:

[0006] A high-efficiency dry flue gas desulfurization tower includes a vertically arranged desulfurization tower with a closed bottom. An inlet flue is provided on the side near the bottom for connecting the original flue gas pipeline of the furnace body to the desulfurization tower. The inlet flue has an inlet expansion joint for pipe connection. The desulfurization tower is a cylindrical tower body. A Venturi contraction section is connected to the top of the tower body. A Venturi straight pipe section is connected to the top of the Venturi contraction section. A Venturi diffuser section is connected to the top of the Venturi straight pipe section. A cap is fitted onto the Venturi diffuser section. The upper part of the Venturi straight pipe section is located inside the cap. A swirl plate is provided between the cap and the Venturi straight pipe section. The inner diameter edge of the swirl plate is connected to the Venturi straight pipe section. An outlet flue is formed on the side near the bottom of the cap for connection to a downstream bag filter.

[0007] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the length of the upper part of the Venturi straight pipe section located inside the cap is not less than two-thirds of the total length of the Venturi straight pipe section.

[0008] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the axes of the desulfurization tower, the Venturi contraction section, the Venturi straight pipe section, and the Venturi diffusion section are located on the same straight line.

[0009] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the Venturi contraction section and the Venturi diffusion section are arranged in a mirror-symmetrical manner.

[0010] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the bottom of the cap is an inclined base plate, and the inclined direction of the base plate is towards the outlet flue.

[0011] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the bottom plate is provided with a number of gasification plates on the high slope side away from the outlet flue for blowing off the ash accumulated on the bottom plate.

[0012] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the outlet flue is provided with an outlet expansion joint for pipe connection.

[0013] Preferably, in the above-mentioned high-efficiency dry flue gas desulfurization tower, the bottom of the desulfurization tower is a flat plate structure, which is directly fixed on a concrete foundation or a steel support.

[0014] The advantages and positive effects of this utility model are: the high-efficiency dry flue gas desulfurization tower of this utility model has a reasonable structural design, occupies a small area, can improve the mixing uniformity of flue gas and desulfurizing agent, increase the desulfurization reaction time, improve the desulfurization efficiency, thereby improving the utilization rate of desulfurizing agent and reducing operating costs. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention;

[0016] Figure 2 for Figure 1 Cross-sectional view at "AA" in the middle. Detailed Implementation

[0017] To provide a further understanding of this utility model, the following description, with reference to the accompanying drawings and specific embodiments, will further illustrate the utility model:

[0018] In the description of this utility model, it should be noted that the terms "vertical," "upper," "lower," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0020] To further understand the invention content, features, and effects of this utility model, the following embodiments are provided in detail:

[0021] Please see Figure 1 and Figure 2 As shown in the figure, this utility model proposes a high-efficiency dry flue gas desulfurization tower. The desulfurization tower includes a vertically arranged desulfurization tower 3, with a closed bottom. Near its bottom, an inlet flue duct 2 is provided on its side for connecting the original flue gas pipeline of the furnace body to the desulfurization tower 3. The inlet flue duct 2 has an inlet expansion joint 1 for pipe connection. As an improvement of this utility model, the desulfurization tower 3 is a cylindrical tower body. A Venturi contraction section 4 is connected to the top of the tower body. A Venturi straight pipe section 5 is connected to the top of the Venturi contraction section 4, and a Venturi diffuser section 6 is connected to the top of the Venturi straight pipe section 5. Figure 1 As shown, the axes of the desulfurization tower 3, the Venturi contraction section 4, the Venturi straight pipe section 5, and the Venturi diffuser section 6 are all on the same straight line. After the flue gas enters the desulfurization tower 3, it is accelerated through the Venturi contraction section 4, then enters the Venturi diffuser section 6 through the Venturi straight pipe section 5, and finally decelerates in the Venturi diffuser section 6. That is, the flue gas is first accelerated and then decelerated under the action of the Venturi, which generates strong turbulence during its upward flow, making the flue gas and desulfurizing agent mix more evenly.

[0022] like Figure 1As shown, a cap 7 is fitted over the Venturi diffuser section 6, with the upper part of the Venturi straight pipe section 5 located inside the cap 7. After the flue gas flows out of the Venturi diffuser section 6, it flows downwards after being deflected by the cap 7, prolonging the reaction time between the flue gas and the desulfurizing agent. Figure 1 As shown, a swirl plate 8 is provided between the hood 7 and the Venturi straight pipe section 5, wherein the inner diameter edge of the swirl plate 8 is connected to the Venturi straight pipe section 5. The swirl plate 8 serves two purposes: firstly, it fixes the hood 7 and the Venturi straight pipe section 5; secondly, it enhances the swirling turbulence of the flue gas within the hood 7, resulting in a more uniform mixing of the flue gas and the desulfurizing agent. To prolong the reaction time of the flue gas with the desulfurizing agent within the hood 7, such as... Figure 1 As shown, the cap 7 has an outlet flue 10 formed on its side near the bottom, which connects to the downstream bag filter. By placing the outlet flue 10 at the lower end, the residence time of the flue gas in the desulfurization tower is extended. To facilitate connection to the downstream bag filter, the outlet flue 10 is equipped with an outlet expansion joint 11 for pipe connection.

[0023] Furthermore, in a preferred embodiment of this invention, the length of the upper section of the Venturi straight pipe section 5 located inside the cap 7 is not less than two-thirds of the total length of the Venturi straight pipe section 5. The heat transferred through the Venturi straight pipe section 5 can provide heat to the flue gas and desulfurizing agent mixture retained in the cap 7, promoting a better desulfurization reaction between the flue gas and the desulfurizing agent.

[0024] like Figure 1 As shown, the Venturi contraction section 4 and the Venturi diffusion section 6 are arranged in a mirror-symmetrical configuration. The bottom of the cap 7 is an inclined base plate, with the inclined direction facing the outlet flue 10 side. This inclined arrangement facilitates the flow of the desulfurizing agent. To effectively prevent ash accumulation on the bottom plate of the cap 7, such as... Figure 1 As shown, the bottom plate is provided with several gasification plates 9 on the high slope side away from the outlet flue 10 for blowing off the ash accumulated on the bottom plate.

[0025] Furthermore, in a preferred embodiment of this utility model, such as Figure 1 As shown, the bottom of the desulfurization tower 3 is a flat plate structure, directly fixed to a concrete foundation or steel support. Typically, the inlet of the bag filter is relatively high; by adjusting the height of the desulfurization tower 3 and the hood 7, flexible docking with downstream dust collectors can be achieved, saving floor space.

[0026] In summary, the desulfurization tower proposed in this invention has a small footprint and a high outlet position, making it easier to connect to the inlet of the bag filter downstream. A Venturi device is installed at the top of the desulfurization tower, and the turbulent flow of the flue gas ensures uniform mixing of the flue gas and desulfurizing agent. A hood is installed at the Venturi outlet, causing the flue gas to flow downwards after being deflected by the hood, extending the reaction time between the flue gas and the desulfurizing agent. A swirl plate is installed between the hood and the Venturi, which serves to fix the hood and the desulfurization tower, and also enhances the swirling turbulence of the flue gas, making the mixing of flue gas and desulfurizing agent even more uniform. This not only makes the mixing of desulfurizing agent and flue gas more uniform, but also increases the reaction time, thus allowing for a lower sodium-sulfur ratio (or calcium-sulfur ratio) to meet SO2 emission standards, saving desulfurizing agent consumption and reducing operating costs. The vertical layout of the desulfurization tower, with its small footprint, is more suitable for the retrofitting of desulfurization projects with limited space.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as claimed. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency dry flue gas desulfurization tower, comprising a vertically arranged desulfurization tower (3), the bottom of the desulfurization tower (3) being closed, and an inlet flue (2) for connecting the original flue gas pipeline of the furnace body to the desulfurization tower (3) being provided on the side near the bottom, wherein the inlet flue (2) is provided with an inlet expansion joint (1) for pipe connection, characterized in that, The desulfurization tower (3) is a cylindrical tower body. A Venturi contraction section (4) is connected to the top of the tower body. A Venturi straight pipe section (5) is connected to the top of the Venturi contraction section (4). A Venturi diffuser section (6) is connected to the top of the Venturi straight pipe section (5). A cap (7) is fitted on the Venturi diffuser section (6). The upper part of the Venturi straight pipe section (5) is located inside the cap (7). A swirl plate (8) is provided between the cap (7) and the Venturi straight pipe section (5). The inner diameter edge of the swirl plate (8) is connected to the Venturi straight pipe section (5). An outlet flue (10) connected to the downstream bag filter is formed on the side near its bottom of the cap (7).

2. The high-efficiency dry flue gas desulfurization tower according to claim 1, characterized in that, The length of the upper part of the Venturi straight pipe section (5) located inside the cap (7) is not less than two-thirds of the length of the entire Venturi straight pipe section (5).

3. The high-efficiency dry flue gas desulfurization tower according to claim 1, characterized in that, The axes of the desulfurization tower (3), the Venturi contraction section (4), the Venturi straight pipe section (5), and the Venturi diffusion section (6) are on the same straight line.

4. The high-efficiency dry flue gas desulfurization tower according to claim 3, characterized in that, The Venturi contraction section (4) and the Venturi diffusion section (6) are arranged in a mirror image symmetrically.

5. The high-efficiency dry flue gas desulfurization tower according to claim 1, characterized in that, The bottom of the cap (7) is an inclined base plate, and the inclined direction of the base plate is towards the outlet flue (10).

6. The high-efficiency dry flue gas desulfurization tower according to claim 5, characterized in that, The bottom plate is provided with several gasification plates (9) on the high slope side away from the outlet flue (10) for blowing off the ash accumulated on the bottom plate.

7. The high-efficiency dry flue gas desulfurization tower according to claim 1, characterized in that, The outlet flue (10) is equipped with an outlet expansion joint (11) for pipe connection.

8. The high-efficiency dry flue gas desulfurization tower according to claim 1, characterized in that, The bottom of the desulfurization tower (3) is a flat plate structure, which is directly fixed to a concrete foundation or a steel support.

Images