Flue gas desulfurization equipment for blast furnace hot blast stove

Abstract

The utility model discloses flue gas desulfurization equipment for a blast furnace hot blast stove, which comprises a desulfurization tower, a flue gas inlet pipe and a limestone solution storage tank, the flue gas inlet pipe is welded on one side of the lower end of the desulfurization tower, the limestone solution storage tank for storing alkaline solution is erected at the lower end of the desulfurization tower, and the lower end of the limestone solution storage tank is communicated with a settling tank. A demisting tower is erected on the desulfurizing tower along the upper part of the conveying pipeline, a smoke outlet pipeline is erected at the top of the upper end of the desulfurizing tower, and gas conveying nozzles for conveying pressurized air penetrate through the periphery of the inner wall of the settling tank. When the flue gas desulfurization equipment for the blast furnace hot blast stove is used, the bracket is used as a supporting part and is connected with a desulfurization tower in a welding connection manner, the connection strength is high, the structure is stable, the requirement that the desulfurization tower is stably erected at a preset position of a plant is met, and the long-term use of the desulfurization tower is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of hot blast furnace flue gas desulfurization equipment, in particular to a blast furnace hot blast furnace flue gas desulfurization equipment. Background Art

[0002] Hot blast furnace flue gas desulfurization uses neutralization reaction for desulfurization. SO2 in flue gas is acidic, and SO2 can be removed from flue gas by reacting with appropriate alkaline substances. The most commonly used alkaline substances for flue gas desulfurization are limestone (calcium carbonate, CaCO3), quicklime (calcium oxide, CaO) and slaked lime (calcium hydroxide, Ca(OH)2). In the wet flue gas desulfurization system, alkaline substances (usually alkaline solutions, more often alkaline slurries) meet flue gas in the spray tower. SO2 in the flue gas dissolves in water to form a dilute acid solution, which then reacts with the alkaline substance dissolved in water. A good flue gas desulfurization equipment can effectively meet the use requirements of hot blast furnace flue gas desulfurization and bring good economic benefits to the enterprise.

[0003] The flue gas desulfurization equipment on the market adopts a horizontal design at the bottom of the desulfurization tower, which may cause a certain amount of solution residue in the subsequent pouring out of the desulfurization solution, resulting in subsequent gypsum precipitation and agglomeration, making it more difficult to clean the bottom of the desulfurization tower, and bringing a certain economic burden to the using companies. For this reason, we propose a blast furnace hot blast stove flue gas desulfurization equipment. Utility Model Content

[0004] The utility model aims to provide a blast furnace hot blast stove flue gas desulfurization device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a blast furnace hot blast stove flue gas desulfurization equipment, comprising a desulfurization tower, a smoke inlet pipe and a limestone solution storage tank, a smoke inlet pipe is welded to one side of the lower end of the desulfurization tower, and a limestone solution storage tank for storing alkaline solution is mounted at the lower end of the desulfurization tower, the lower end of the limestone solution storage tank is connected to a sedimentation tank, a defog tower is mounted above the desulfurization tower along the conveying pipeline, a smoke outlet pipeline is mounted on the top of the upper end of the desulfurization tower, a gas supply nozzle for conveying pressurized air is penetrated around the inner wall of the sedimentation tank, and one end of the gas supply nozzle away from the sedimentation tank is connected to a docking joint, the other end of the docking joint is connected to an annular pipeline, and one end of the annular pipeline is connected to a pressurized pipeline, the gas supply nozzle is inserted into the sedimentation tank in an inclined state, and the inclination angle of the gas supply nozzle is -°.

[0006] Preferably, a plurality of brackets are welded around the outer wall of the lower end of the desulfurization tower, and the desulfurization tower is erected at a preset position in the factory building through the brackets.

[0007] Preferably, a lower fixing plate is welded to the lower end of the demisting tower, and reinforcing ribs are welded around the outer wall of the lower fixing plate. The lower fixing plate is fixedly connected to the desulfurization tower through the reinforcing ribs.

[0008] Preferably, a number of herringbone plates are welded to the inner wall of the demisting tower, and the herringbone plates are evenly distributed around the inner wall of the demisting tower.

[0009] Preferably, a conveying pipeline for conveying alkaline solution is installed in the middle of the inner wall of the desulfurization tower, and a number of atomizing nozzles are welded around the outer wall of the conveying pipeline.

[0010] Preferably, the atomizing nozzles spray limestone solution, and the limestone solution neutralizes the flue gas of the blast furnace hot blast stove.

[0011] Preferably, the lower end of the conveying pipeline is connected to a conveying pump, and one end of the conveying pump is interconnected with a limestone solution storage tank, and the conveying pipeline is connected to the limestone solution storage tank through the conveying pump.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows: When the blast furnace hot blast stove flue gas desulfurization equipment is in use, the bracket, as a supporting component, is connected to the desulfurization tower by welding. The connection strength is high and the structure is stable, meeting the requirement of stably installing the desulfurization tower at the preset position in the factory building, and ensuring that the desulfurization tower can be used for a long time.

[0013] The demisting tower, as a water vapor demisting component, sprays the limestone solution into the desulfurization tower by pressurized atomization. The limestone solution is an alkaline solution that undergoes a neutralization reaction with the sulfur-containing acidic flue gas to reduce the sulfur content in the flue gas. The reaction solution is calcium sulfite, thus meeting the requirement of the neutralization reaction of the sulfur-containing acidic flue gas and achieving the requirement of green emission. At the same time, calcium sulfite can also be collected. By pumping a large amount of oxygen into the limestone solution, calcium sulfite can be chemically converted into calcium sulfate, that is, gypsum products are generated, thereby improving the economic return rate of the emission enterprise and bringing good economic benefits to the enterprise.

[0014] The gas transmission nozzle is inserted into the precipitation tank in an inclined manner. By means of compressed air transportation, the limestone solution in the precipitation tank is stirred, so that the limestone solution in the precipitation tank will not precipitate and caking, which is convenient for the subsequent centralized discharge of calcium sulfate solution through the precipitation tank, bringing convenience to the production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0016] Figure 2 is a structural schematic diagram of the demisting tower of the present utility model;

[0017] Figure 3This is a schematic diagram of the sedimentation tank structure of the present utility model.

[0018] In the figure: 1, desulfurization tower; 11, support; 2, flue gas inlet pipe; 3, limestone solution storage tank; 4, sedimentation tank; 41, gas transmission spray head; 42, docking head; 43, annular pipeline; 5, conveying pipeline; 51, atomizing spray head; 52, conveying pump; 6, demisting tower; 61, lower fixed plate; 62, reinforcing rib; 63, herringbone plate; 7, flue gas outlet pipe. Specific implementation mode

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Embodiment 1

[0020] Please refer to Figures 1 - 3 , the present utility model provides a technical solution: a blast furnace hot blast stove flue gas desulfurization device, including a desulfurization tower 1, a flue gas inlet pipe 2 and a limestone solution storage tank 3. One side of the lower end of the desulfurization tower 1 is welded with the flue gas inlet pipe 2, and a limestone solution storage tank 3 for storing alkaline solution is erected at the lower end of the desulfurization tower 1. The lower end of the limestone solution storage tank 3 is communicated with a sedimentation tank 4. A demisting tower 6 is erected above the conveying pipeline 5 along the desulfurization tower 1, and a flue gas outlet pipe 7 is erected at the top of the upper end of the desulfurization tower 1. A gas transmission spray head 41 for conveying pressurized air penetrates into the periphery of the inner wall of the sedimentation tank 4, and one end of the gas transmission spray head 41 away from the sedimentation tank 4 is communicated with a docking head 42. The other end of the docking head 42 is communicated with an annular pipeline 43, and one end of the annular pipeline 43 is communicated with a pressurized pipeline. The gas transmission spray head 41 is obliquely inserted into the sedimentation tank 4, and the inclination angle of the gas transmission spray head 41 is 30 - 75°. A plurality of supports 11 are welded around the outer wall of the lower end of the desulfurization tower 1, and the desulfurization tower 1 is erected at a preset position in the factory building through the supports 11. As a supporting component, the support 11 is connected to the desulfurization tower 1 by welding, and its connection strength is high and the structure is stable, meeting the requirement of stably erecting the desulfurization tower 1 at the preset position in the factory building, and ensuring that the desulfurization tower 1 can be used for a long time. Embodiment 2

[0021] Please refer to Figures 1 - 3, the present utility model provides a technical solution: a flue gas desulfurization device for a blast furnace hot blast stove. A lower fixing plate 61 is welded to the lower end of the demisting tower 6, and reinforcing ribs 62 are welded around the outer wall of the lower fixing plate 61. The lower fixing plate 61 is fixedly connected to the desulfurization tower 1 through the reinforcing ribs 62. A number of herringbone plates 63 are welded to the inner wall of the demisting tower 6, and the herringbone plates 63 are evenly distributed around the inner wall of the demisting tower 6. The demisting tower 6 serves as a water vapor condensation component. When the limestone solution is sprayed into the desulfurization tower 1 through the atomizing nozzle 51, the limestone solution is atomized and dispersed in all directions in the desulfurization tower 1 under pressure. The limestone solution is an alkaline solution that undergoes a neutralization reaction with the sulfur-containing acidic flue gas to reduce the sulfur content in the flue gas. At the same time, the reaction solution accumulates on the demisting tower 6 and the herringbone plates 63, and the reaction solutions gather with each other to form water droplets that fall into the limestone solution storage tank 3 and the precipitation tank 4. The reaction solution is calcium sulfite, thus meeting the requirements of the neutralization reaction of the sulfur-containing acidic flue gas and achieving the requirement of green emission. At the same time, calcium sulfite can also be collected. The limestone solution is pumped with a large amount of oxygen, and through a chemical reaction, calcium sulfite can be converted into calcium sulfate, that is, gypsum products are generated, thereby improving the economic return rate of the emission enterprise and bringing good economic benefits to the enterprise. A conveying pipeline 5 for conveying the alkaline solution is installed in the middle of the inner wall of the desulfurization tower 1, and a number of atomizing nozzles 51 are welded around the outer wall of the conveying pipeline 5. The atomizing nozzles 51 spray the limestone solution, and the limestone solution neutralizes the flue gas of the blast furnace hot blast stove. The lower end of the conveying pipeline 5 is connected to a conveying pump 52, and one end of the conveying pump 52 is interconnected with the limestone solution storage tank 3, and the conveying pipeline 5 is connected to the limestone solution storage tank 3 through the conveying pump 52. The limestone solution is an alkaline solution, and through the conveyance of the conveying pump 52, the limestone solution in the limestone solution storage tank 3 is pumped into a number of atomizing nozzles 51, so that the desulfurization tower 1 is filled with a large amount of limestone solution, thus meeting the requirement of a sufficient neutralization reaction of the sulfur-containing acidic flue gas and achieving the requirement of flue gas desulfurization. At the same time, to reduce the solidification and aggregation of the limestone solution, the gas conveying nozzle 41 is inserted into the precipitation tank 4 in an inclined manner, and the inclination angle of the gas conveying nozzle 41 is placed at 45°. Through the way of compressed air conveyance, the limestone solution in the precipitation tank 4 is stirred, so that the limestone solution in the precipitation tank 4 will not precipitate and cake, which is convenient for the subsequent centralized discharge of the calcium sulfate solution from the precipitation tank 4 and brings convenience to the generation.

[0022] Working principle: For this type of blast furnace hot blast stove flue gas desulfurization equipment, first, the sulfur-containing acidic flue gas is transported to the desulfurization tower 1 through the flue gas inlet pipe 2. At this time, through the transportation of the transfer pump 52, the limestone solution in the limestone solution storage tank 3 is pumped into a number of atomizing nozzles 51, so that the desulfurization tower 1 is filled with a large amount of limestone solution. Subsequently, the limestone solution, as an alkaline solution, undergoes a neutralization reaction with the sulfur-containing acidic flue gas to reduce the sulfur content in the flue gas. At the same time, the reaction solution accumulates on the demisting tower 6 and the herringbone plate 63, and the reaction solutions gather with each other to form water droplets and fall into the limestone solution storage tank 3 and the precipitation tank 4. This reaction solution is calcium sulfite. The gas delivery nozzle 41 is inserted into the precipitation tank 4 in an inclined manner, and the inclination angle of the gas delivery nozzle 41 is placed at 45°. Through the method of compressed air transportation, the limestone solution in the precipitation tank 4 is agitated, so that the limestone solution in the precipitation tank 4 will not precipitate and caking. The limestone solution is pumped with a large amount of oxygen, so that calcium sulfite can be converted into calcium sulfate through a chemical reaction, that is, gypsum products are generated. Finally, by opening the precipitation tank 4, the calcium sulfate and other sulfide products are transported to the designated position through the pipeline for further processing.

Claims

1. A blast furnace hot blast stove flue gas desulfurization device, comprising a desulfurization tower (1), a flue gas inlet pipe (2) and a limestone solution storage tank (3), characterized in that: A smoke inlet pipe (2) is welded to one side of the lower end of the desulfurization tower (1), and a limestone solution storage tank (3) for storing an alkaline solution is mounted at the lower end of the desulfurization tower (1), and the lower end of the limestone solution storage tank (3) is connected to a sedimentation tank (4). A demisting tower (6) is mounted on the desulfurization tower (1) along the upper side of the delivery pipeline (5), and a smoke outlet pipeline (7) is mounted on the top of the upper end of the desulfurization tower (1). A gas delivery nozzle (41) for delivering pressurized air is inserted around the inner wall of the sedimentation tank (4), and one end of the gas delivery nozzle (41) away from the sedimentation tank (4) is connected to a docking joint (42), and the other end of the docking joint (42) is connected to an annular pipeline (43), and one end of the annular pipeline (43) is connected to a pressurized pipeline. The gas delivery nozzle (41) is inserted into the sedimentation tank (4) in an inclined state, and the inclination angle of the gas delivery nozzle (41) is 30-75°.

2. A blast furnace hot blast stove flue gas desulfurization equipment according to claim 1, characterized in that: A plurality of brackets (11) are welded around the outer wall of the lower end of the desulfurization tower (1), and the desulfurization tower (1) is erected at a preset position of the factory building via the brackets (11).

3. A blast furnace hot blast stove flue gas desulfurization equipment according to claim 1, characterized in that: A lower fixing plate (61) is welded to the lower end of the demisting tower (6), and reinforcing ribs (62) are welded around the outer wall of the lower fixing plate (61). The lower fixing plate (61) is fixedly connected to the desulfurization tower (1) via the reinforcing ribs (62).

4. A blast furnace hot blast stove flue gas desulfurization equipment according to claim 3, characterized in that: A plurality of herringbone plates (63) are welded to the inner wall of the demister tower (6), and the herringbone plates (63) are evenly distributed around the inner wall of the demister tower (6).

5. The blast furnace hot blast stove flue gas desulfurization equipment according to claim 1, characterized in that: A delivery pipeline (5) for delivering alkaline solution is installed in the middle of the inner wall of the desulfurization tower (1), and a plurality of atomizing nozzles (51) are welded around the outer wall of the delivery pipeline (5).

6. A blast furnace hot blast stove flue gas desulfurization equipment according to claim 5, characterized in that: The atomizing nozzle (51) sprays limestone solution, and the limestone solution neutralizes the blast furnace hot blast furnace flue gas.

7. The blast furnace hot blast stove flue gas desulfurization equipment according to claim 5, characterized in that: The lower end of the delivery pipeline (5) is connected to a delivery pump (52), and one end of the delivery pump (52) is connected to the limestone solution storage tank (3), and the delivery pipeline (5) is connected to the limestone solution storage tank (3) through the delivery pump (52).

Images