Desulfurizing tower for waste gas treatment of smelting furnace

Abstract

The utility model discloses a desulfurizing tower for waste gas treatment of a smelting furnace, and relates to the technical field of waste gas treatment. The desulfurizing tower for waste gas treatment of the smelting furnace comprises a tower body, the tower body is provided with a spraying mechanism in a matched mode, the spraying mechanism comprises five spraying layers, the spraying layers are arranged in the tower body in rows, the distance between every two adjacent spraying layers is equal, the tower body is further provided with an atomizing mechanism in a matched mode, and the atomizing mechanism is arranged in the tower body in a matched mode. The atomizing mechanism comprises an atomizing nozzle arranged at the lower end of the spraying layer, and the atomizing nozzle is connected with a steam drainage pipe in a sealed mode. In order to overcome the defect of low deacidification efficiency caused by temperature drop during flue gas desulfurization, the gas temperature in the desulfurization process is effectively maintained through introduction of water vapor, and waste gas temperature drop caused by heat release of a neutralization reaction is avoided, so that the activity of acid gas molecules is maintained, and the desulfurization efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a desulfurization tower for treating waste gas from a smelting furnace. Background Technique

[0002] At present, the desulfurization of waste gas in desulfurization towers generally adopts the method of spraying lime slurry and ammonia water. In order to increase the mass transfer effect and improve the gas-liquid contact area, the engineering generally adopts the method of alkali liquid atomization. However, the neutralization reaction is an exothermic process, which will cause the gas temperature to drop, reduce the Brownian motion of acid gas molecules, and is not conducive to the diffusion of gaseous acid to the alkali liquid, resulting in that acid molecules cannot overcome the double-film resistance and enter the liquid phase from the gas phase, leading to low acid removal efficiency.

[0003] Therefore, in order to solve the defect of low acid removal efficiency caused by the temperature drop during flue gas desulfurization, it is very necessary to propose a desulfurization tower for treating waste gas from a smelting furnace. Content of the Utility Model

[0004] The purpose of the utility model is to provide a desulfurization tower for treating waste gas from a smelting furnace. By introducing water vapor, the gas temperature during the desulfurization process is effectively maintained, avoiding the waste gas temperature drop caused by the exothermic neutralization reaction, thereby maintaining the activity of acid gas molecules and improving the desulfurization efficiency, so as to solve the problems proposed in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A desulfurization tower for treating waste gas from a smelting furnace includes a tower body. The tower body is equipped with a spraying mechanism. The spraying mechanism includes five spraying layers. The spraying layers are arranged in columns in the tower body, and the distance between adjacent two spraying layers is equal. The tower body is also equipped with an atomization mechanism. The atomization mechanism includes atomizing nozzles arranged at the lower ends of the spraying layers. The atomizing nozzles are hermetically connected with steam diversion pipes. The steam diversion pipes and the atomizing nozzles are both symmetrically arranged about the tower body in the front and back. The steam diversion pipe at the rear end is hermetically connected with a steam storage tank through a pump body.

[0007] Preferably, a communicating pipe is hermetically connected between the two steam diversion pipes.

[0008] Preferably, the spraying layer includes a main pipeline and branch pipes. The branch pipes are fixed by support beams, and spraying nozzles are installed at their lower ends.

[0009] Preferably, an air inlet is opened at the lower end of the tower body, and an air outlet is opened at its top end.

[0010] Preferably, the two lower spraying layers form an ammonia water layer. The main pipelines of the ammonia water layer are jointly connected with an ammonia water diversion pipe. The ammonia water diversion pipe is hermetically connected with an ammonia water storage tank through a pump body.

[0011] Preferably, the upper three spray layers form a lime slurry layer. The main pipes of the lime slurry layer are jointly connected with a lime slurry drain pipe, and the lime slurry drain pipe is hermetically connected with a lime slurry storage tank through a pump body.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] 1. For the desulfurization tower used in the waste gas treatment of this smelting furnace, by increasing the number of spray layers and prolonging the gas-liquid reaction time, more acidic gases in the waste gas are dissolved in the alkali solution and thus absorbed. Moreover, the lower two spray layers form an ammonia water layer for treating low-concentration sulfur dioxide, while the upper three spray layers form a lime slurry layer for treating high-concentration sulfur dioxide. This layered treatment method has strong pertinence and improves the desulfurization efficiency.

[0014] 2. For the desulfurization tower used in the waste gas treatment of this smelting furnace, by introducing high-temperature steam through the atomizing nozzles, the temperature of the gas during the desulfurization process is effectively maintained, avoiding the temperature drop caused by the exothermic neutralization reaction. Thus, the activity of acidic gas molecules is maintained, the Brownian motion of acidic gas molecules is enhanced, the mass transfer efficiency is improved, and at the same time, the desulfurization efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional view of the overall structure of the present utility model;

[0016] Figure 2 is a plan view of the overall structure of the present utility model;

[0017] Figure 3 is a schematic diagram of the spray layer distribution of the present utility model;

[0018] Figure 4 is a schematic diagram of the atomizing mechanism structure of the present utility model;

[0019] Figure 5 is a schematic diagram of the atomizing nozzle distribution of the present utility model;

[0020] Figure 6 is a schematic diagram of the spray layer structure of the present utility model.

[0021] In the figure: 1. Tower body; 11. Air inlet; 12. Air outlet; 2. Spraying mechanism; 21. Spray layer; 211. Main pipe; 212. Branch pipe; 213. Spray nozzle; 22. Ammonia water drain pipe; 23. Ammonia water storage tank; 24. Lime slurry drain pipe; 25. Lime slurry storage tank; 26. Support beam; 3. Atomizing mechanism; 31. Atomizing nozzle; 32. Steam drain pipe; 33. Connecting pipe; 34. Steam storage tank; 4. Pump body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0023] To solve the technical problem of how to perform spray acid removal in a desulfurization tower, please refer to Figures 1-6 , the following technical solutions are provided in this embodiment:

[0024] A desulfurization tower for treating waste gas from a smelting furnace includes a tower body 1. An air inlet 11 is provided at the lower end of the tower body 1, and an air outlet 12 is provided at its top end. The tower body 1 is equipped with a spray mechanism 2. The spray mechanism 2 includes five spray layers 21. The spray layers 21 are arranged in columns inside the tower body 1, and the distance between adjacent two spray layers 21 is equal, and the distance between each layer is 1.8 m - 2.2 m.

[0025] The spray layer 21 includes a main pipe 211 and branch pipes 212. The branch pipes 212 are fixed by support beams 26, and spray nozzles 213 are installed at their lower ends. The spraying diameter of the spray nozzles 213 is 1.8 m, and the distance between adjacent spray nozzles 213 is controlled within 0.7 m - 1.2 m.

[0026] The two lower spray layers 21 form an ammonia water layer. The main pipes 211 of the ammonia water layer are jointly connected to an ammonia water drainage pipe 22. The ammonia water drainage pipe 22 is hermetically connected to an ammonia water storage tank 23 through a pump body 4. The three upper spray layers 21 form a lime slurry layer. The main pipes 211 of the lime slurry layer are jointly connected to a lime slurry drainage pipe 24. The lime slurry drainage pipe 24 is hermetically connected to a lime slurry storage tank 25 through a pump body 4.

[0027] Among them, the setting that the spraying diameter of the spray nozzles 213 is 1.8 m and the distance between adjacent spray nozzles 213 is controlled within 0.7 m - 1.2 m is to ensure that there is a certain overlap rate in the spraying range of the spray nozzles 213, so that the spray liquid can uniformly cover the flue gas;

[0028] The setting of the support beams 26 is to fix the branch pipes 212, because the spray nozzles 213 will vibrate during spraying, and fixing through the support beams 26 is beneficial to the stability during spraying.

[0029] Specifically, the waste gas enters the tower body 1 through the air inlet 11. The pump body 4 is started, and ammonia water is transported from the ammonia water storage tank 23 to the main pipeline 211 of the ammonia water layer through the ammonia water diversion pipe 22. Then, the ammonia water is sprayed from the spray nozzles 213 through the branch pipes 212 and reacts with sulfur dioxide in the waste gas to generate ammonium sulfate. After being treated by the ammonia water layer, the waste gas continues to move upward. Then, the pump body 4 is started again, and lime slurry is transported from the lime slurry storage tank 25 to the main pipeline 211 of the lime slurry through the lime slurry diversion pipe 24. The lime slurry is then sprayed from the spray nozzles 213 through the branch pipes 212 and reacts with the remaining sulfur dioxide in the waste gas to generate gypsum. The waste gas after being treated by multiple layers of spraying is discharged through the air outlet 12, and the generated ammonium sulfate and gypsum can be recycled through steps such as precipitation, filtration, and dehydration.

[0030] To solve the technical problem of how to improve the acid removal efficiency of the desulfurization tower, please refer to Figures 3-5 , this embodiment provides the following technical solutions:

[0031] The tower body 1 is also equipped with an atomization mechanism 3. The atomization mechanism 3 includes atomizing nozzles 31 provided at the lower end of the spray layer 21. The atomizing nozzles 31 are hermetically connected to steam diversion pipes 32. Both the steam diversion pipes 32 and the atomizing nozzles 31 are symmetrically arranged about the tower body 1 in the front and back directions. The steam diversion pipe 32 located at the rear is hermetically connected to a steam storage tank 34 through a pump body 4, and a connecting pipe 33 is hermetically connected between the two steam diversion pipes 32.

[0032] Specifically, during the reaction of ammonia water and lime slurry with the flue gas, high-temperature steam is introduced through the steam diversion pipes 32, effectively maintaining the gas temperature during the desulfurization process, avoiding the temperature drop caused by the exothermic neutralization reaction, thereby maintaining the activity of acid gas molecules, enhancing the Brownian motion of acid gas molecules, improving the mass transfer efficiency, enabling acid gas molecules to overcome the double-film resistance and enter the alkali solution to fuse with it, and enabling more acid molecules to be carried away by the alkali solution, thereby improving the desulfurization efficiency.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A desulfurization tower for smelting furnace waste gas treatment, comprising a tower body (1), the tower body (1) is equipped with a spraying mechanism (2), the spraying mechanism (2) includes five spraying layers (21), the spraying layers (21) are arranged in columns in the tower body (1), and the distance between adjacent two spraying layers (21) is equal, and it is characterized in that: The tower body (1) is also equipped with an atomization mechanism (3). The atomization mechanism (3) includes atomizing nozzles (31) provided at the lower end of the spray layer (21). The atomizing nozzles (31) are hermetically connected to steam diversion pipes (32). Both the steam diversion pipes (32) and the atomizing nozzles (31) are symmetrically arranged in the front and back with respect to the tower body (1). The steam diversion pipe (32) located at the rear end is hermetically connected to a steam storage tank (34) through a pump body (4).

2. The desulfurization tower for smelting furnace waste gas treatment according to claim 1, characterized in that: A connecting pipe (33) is hermetically connected between the two steam diversion pipes (32).

3. A desulfurization tower for treating waste gas from a smelting furnace according to claim 1, characterized in that: The spray layer (21) includes a main pipe (211) and branch pipes (212). The branch pipes (212) are fixed by support beams (26), and spray nozzles (213) are installed at their lower ends.

4. A desulfurization tower for smelting furnace waste gas treatment according to claim 1, characterized in that: An air inlet (11) is provided at the lower end of the tower body (1), and an air outlet (12) is provided at its top end.

5. A desulfurization tower for treating waste gas from a smelting furnace according to claim 1, characterized in that: The two lower spray layers (21) form an ammonia water layer. The main pipes (211) of the ammonia water layer are jointly connected to an ammonia water diversion pipe (22). The ammonia water diversion pipe (22) is hermetically connected to an ammonia water storage tank (23) through a pump body (4).

6. The desulfurization tower for smelting furnace waste gas treatment according to claim 5, wherein: The three upper spray layers (21) form a lime slurry layer. The main pipes (211) of the lime slurry layer are jointly connected to a lime slurry diversion pipe (24). The lime slurry diversion pipe (24) is hermetically connected to a lime slurry storage tank (25) through a pump body (4).

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