Selenium-containing flue gas recovery device for Kaldo furnace

Abstract

The utility model relates to the technical field of flue gas treatment, and discloses a Kaldo furnace selenium-containing flue gas recovery device which comprises a first-stage dynamic wave tower and a second-stage dynamic wave tower, one side of the first-stage dynamic wave tower is connected with the second-stage dynamic wave tower through a pipeline, a fire fighting water pipeline is arranged on the first-stage dynamic wave tower, and the fire fighting water pipeline is connected with the second-stage dynamic wave tower through a pipeline. The fire-fighting water pipeline is connected with a gravity settling chamber through a pipeline, a first-stage dynamic wave pump is arranged on the first-stage dynamic wave tower, a booster pump is connected with a pipeline on one side of the first-stage dynamic wave tower, and the first-stage dynamic wave tower and the second-stage dynamic wave tower are connected with an alkali preparation tank through a common pipeline. According to the Kaldo furnace selenium-containing flue gas recovery device, a creative novel Kaldo furnace selenium-containing flue gas recovery technology is adopted, the selenium recovery rate can be increased to 95% or above from traditional 60-70%, the direct selenium recovery rate is increased to 90% or above from traditional 50%, meanwhile, the problem of system blockage is solved, the system can operate continuously, the production efficiency is greatly improved, and the production cost is reduced. And the overall productivity of the Kaldo furnace is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a selenium-containing flue gas recovery device for a Kaldo furnace. Background Art

[0002] The Kaldo furnace is an oxygen oblique-blown converter used for smelting and processing of metals. The Kaldo furnace, also known as the oxygen oblique-blown converter, is a widely used equipment in the field of metal smelting, especially for processing high-phosphorus and high-sulfur pig iron and scrap steel. The quality of its finished product is better than that of traditional open-hearth steel.

[0003] There are many flue gas treatment devices for Kaldo furnaces. For example, Chinese patent CN215063787U discloses a cooling and dust removal device for a Kaldo furnace, which includes structures such as a spray cooling tower. However, in the existing Kaldo furnace operation, the recovery of high-temperature selenium-containing flue gas mainly adopts spray tower technology and Venturi absorption technology. These technologies have problems such as poor quenching effect, high system resistance and easy clogging, which lead to obstruction of production continuity, low dust removal efficiency and selenium recovery rate. In addition, in the traditional recovery mode, the elemental selenium content in the acid sludge is too high, which seriously affects the direct recovery rate of selenium. Therefore, a Kaldo furnace selenium-containing flue gas recovery device is proposed to solve the above problems. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the utility model provides a Kaldo furnace selenium-containing flue gas recovery device, which has the advantages of high recovery efficiency and solves the problem of low recovery efficiency of traditional technology.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned high recovery efficiency purpose, the utility model provides the following technical solutions: a Kaldo furnace selenium-containing flue gas recovery device, including a first-level power wave tower and a second-level power wave tower, one side of the first-level power wave tower is connected to the second-level power wave tower pipeline, the first-level power wave tower is provided with a fire water pipeline, the fire water pipeline is connected to a gravity sedimentation chamber, the first-level power wave tower is provided with a first-level power wave pump, one side of the first-level power wave tower is connected to a booster pump, the first-level power wave tower and the second-level power wave tower are connected to an alkali preparation tank through a common pipeline, the alkali preparation tank is provided with an alkali preparation pump, one side of the alkali preparation tank is connected to an alkali storage tank through the alkali preparation pump, and one side of the alkali storage tank is connected to an alkali unloading pump. The other side of the alkali preparation tank is connected to an alkali adding pump, and the side of the alkali adding pump away from the alkali preparation tank is connected to the primary power wave tower and the secondary power wave tower through pipelines at the same time, and one side of the primary power wave tower and the secondary power wave tower are connected to an emergency pit through a common pipeline, and one side of the emergency pit is connected to a return pump, and the other side of the return pump away from the emergency pit is connected to the primary power wave tower and the secondary power wave tower through a common pipeline, and one side of the secondary power wave tower is provided with a secondary power wave pump, and one side of the secondary power wave tower is connected to a cyclone dehydrator, and one side of the cyclone dehydrator is connected to an electric demister, and one side of the electric demister is connected to a main fan.

[0008] Preferably, the fire water pipe and the gravity settling chamber are both provided with an emergency discharge port.

[0009] Preferably, the cyclone dehydrator and one side of the electric demister are connected to a pit waste liquid tank through a common pipeline, and one side of the pit waste liquid tank is provided with an external discharge pump.

[0010] Preferably, an overflow liquid receiving port is provided on one side of the first-stage power wave tower, and the overflow liquid receiving port is connected to the second-stage power wave tower through a pipeline.

[0011] Preferably, one side of the booster pump is externally connected to a workshop water supply pipeline.

[0012] Preferably, a first-level power wave tower overflow liquid receiving port is provided on one side of the pit waste liquid tank.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model provides a selenium-containing fume recovery device for a Kaldo furnace, which has the following beneficial effects:

[0015] This Kaldo furnace selenium-containing flue gas recovery device adopts a groundbreaking new Kaldo furnace selenium-containing flue gas recovery technology, which can increase the selenium recovery rate from the traditional 60-70% to more than 95%, and the direct recovery rate of selenium elements from the traditional 50% to more than 90%. At the same time, it overcomes the problem of system blockage. The system can operate continuously, greatly improving production efficiency and increasing the overall production capacity of the Kaldo furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structural process flow of the utility model;

[0017] Figure 2 This is a reaction principle diagram of the alkaline solution absorbent of the utility model.

[0018] In the figure: 1. First-stage power wave tower; 2. Second-stage power wave tower; 3. Fire water pipeline; 4. Emergency accident discharge port; 5. Gravity sedimentation chamber; 6. First-stage power wave pump; 7. Booster pump; 8. Alkali preparation tank; 9. Alkali preparation pump; 10. Alkali storage tank; 11. Alkali unloading pump; 12. Alkali adding pump; 13. Emergency accident pit tank; 14. Return pump; 15. Second-stage power wave pump; 16. Rotary dehydrator; 17. Pit waste liquid tank; 18. External discharge pump; 19. Electric demister; 20. Main fan. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1A selenium-containing flue gas recovery device for a Kaldo furnace comprises a primary power wave tower 1 and a secondary power wave tower 2. An overflow liquid receiving port is arranged on one side of the primary power wave tower 1, and the overflow liquid receiving port is communicated with the secondary power wave tower 2 through a pipeline. One side of the primary power wave tower 1 is connected to the secondary power wave tower 2 through a pipeline. A fire water pipeline 3 is arranged on the primary power wave tower 1. The fire water pipeline 3 and a gravity sedimentation chamber 5 are jointly provided with an emergency accident discharge port 4. The fire water pipeline 3 is connected to the gravity sedimentation chamber 5. A primary power wave pump 6 is arranged on the primary power wave tower 1. A booster pump 7 is connected to one side of the primary power wave tower 1. A workshop water supply pipeline is externally connected to the booster pump 7. The primary power wave tower 1 and the secondary power wave tower 2 are jointly connected to an alkali preparation tank 8 through a pipeline. An alkali preparation pump 9 is arranged on the alkali preparation tank 8. One side of the alkali preparation tank 8 is connected to an alkali storage tank 10 through the alkali preparation pump 9. One side of the alkali storage tank 10 is connected to an alkali unloading pump 11 through a pipeline. The other side of the alkali preparation tank 8 is connected to an alkali adding pump 12 through a pipeline. The alkali pump 12, the side of the alkali pump 12 away from the alkali preparation tank 8 is connected to the first power wave tower 1 and the second power wave tower 2 at the same time by pipelines, the first power wave tower 1 and the second power wave tower 2 are connected to the emergency pit 13 by a common pipeline, the emergency pit 13 is connected to the return pump 14 by a pipeline on one side, the return pump 14 is connected to the first power wave tower 1 and the second power wave tower 2 by a common pipeline on the other side away from the emergency pit 13, and the second power wave tower 2 is connected to the emergency pit 13 by a common pipeline on the other side. A secondary power wave pump 15 is provided on one side, a pipeline on one side of the secondary power wave tower 2 is connected to a cyclone dehydrator 16, a common pipeline on one side of the cyclone dehydrator 16 and the electric demister 19 is connected to a pit waste liquid tank 17, a primary power wave tower overflow liquid receiving port is provided on one side of the pit waste liquid tank 17, an external discharge pump 18 is provided on one side of the pit waste liquid tank 17, a pipeline on one side of the cyclone dehydrator 16 is connected to the electric demister 19, and a pipeline on one side of the electric demister 19 is connected to a main fan 20.

[0021] It is to be understood that the raw materials used in the examples are all purchased commercially unless otherwise specified.

[0022] See also Figure 2 , using alkaline solution absorbent, its main reaction principle is:

[0023] SeO2 + H2O = H2SeO3

[0024] SO2 + H2O = H2SO3

[0025] SO3 + H2O = H2SO4

[0026] H2SeO3+ 2NaOH = Na2SeO3 + 2H2O

[0027] H2SO3 + 2NaOH = Na2SO3 + 2H2O

[0028] H2SO4 +2NaOH = Na2SO4 + 2H2O

[0029] It should be noted in this embodiment that:

[0030] 1. Use large-caliber reverse jet washing technology to achieve rapid cooling of high-temperature flue gas, overcome system blockage problems, improve production continuity, and increase dust removal efficiency and selenium recovery rate;

[0031] 2. Design a two-stage large-diameter reverse jet washing tower to reduce the solid content in the circulating liquid through continuous filter pressing;

[0032] 3. Control the pH value to be stable at 9 by adding alkali in reverse order to inhibit the reduction of elemental selenium in the circulating liquid;

[0033] 4. Achieve a Kaldo furnace selenium-containing flue gas recovery rate of >95% and a selenium element direct recovery rate of >90%.

[0034] The working principle of this embodiment is as follows:

[0035] (1) Flue gas system

[0036] The high-temperature flue gas of the Kaldo furnace first enters the first-level large-diameter reverse-jet feed pipe for absorption through the flue, enters the first-level power wave tower 1 for spray absorption, and then enters the second-level power wave tower 2 for packing spray absorption and demisting, and finally connects to the cyclone dehydrator 16, the electric demister 19, and the main fan 20 for external discharge;

[0037] When the first-stage power wave pump 6 fails, the temperature monitoring chain opens the accident emergency fire water system to protect subsequent equipment from the impact of high-temperature smoke.

[0038] (2) Liquid supply and drainage system

[0039] Absorbent reserve: 1 high-level tank for liquid alkali, into which 30% alkali liquid is added;

[0040] External drainage: one pit waste liquid tank 17, one emergency pit tank 13;

[0041] In the absorption system, dosing, drainage and water replenishment are automatically controlled by the pH value and liquid level of the circulating liquid respectively;

[0042] The replacement and replenishment of the absorption liquid adopts reverse alkali replenishment. When the absorption liquid in the first-level power wave tower 1 enters the selenium reduction, the second-level absorption liquid is sent to the first tower through the circulation pump, and the second-level power wave tower 2 is replenished with new alkali solution. The first-level absorption liquid enters the filter press for continuous filtration, and the clear liquid flows by gravity to the first-level power wave tower 1 or enters the selenium reduction liquid buffer tank to enter the reduction process regularly. The second-level power wave tower 2 is also equipped with a filter press for acid sludge filtration, and the clear liquid flows by gravity to the main tower in the second-level power wave tower 2. The desulfurization waste liquid is discharged into the second-level power wave tower 2 when the system allows, and is discharged as wastewater when the volume cannot be balanced.

[0043] At the same time, taking into account the situation of selenium reduction and drainage according to the furnace cycle, and the situation where the operating conditions of the first-level tower are poor and equipment failure is prone to occur, an emergency tank for the first-level tower is configured, which is used for the storage of the filtrate to be reduced after each furnace cycle and solves the risk of production system shutdown due to equipment failure.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A selenium-containing fume recovery device for a Kaldo furnace, comprising a primary power wave tower (1) and a secondary power wave tower (2), wherein one side of the primary power wave tower (1) is connected to a pipeline of the secondary power wave tower (2), characterized in that: The first-stage power wave tower (1) is provided with a fire water pipeline (3), the fire water pipeline (3) is connected to a gravity sedimentation chamber (5), the first-stage power wave tower (1) is provided with a first-stage power wave pump (6), one side of the pipeline of the first-stage power wave tower (1) is connected to a booster pump (7), the first-stage power wave tower (1) and the second-stage power wave tower (2) are connected to an alkali preparation tank (8) through a common pipeline, the alkali preparation tank (8) is provided with an alkali preparation pump (9), one side of the alkali preparation tank (8) is connected to an alkali storage tank (10) through the alkali preparation pump (9), one side of the alkali storage tank (10) is connected to an alkali unloading pump (11), the other side of the pipeline of the alkali preparation tank (8) is connected to an alkali adding pump (12), and the side of the alkali adding pump (12) away from the alkali preparation tank (8) is respectively connected to the first-stage power wave tower (8) and the second-stage power wave tower (2) is connected to the alkali preparation tank (8). The first power wave tower (1) and the second power wave tower (2) are connected by pipelines at the same time. A common pipeline on one side of the first power wave tower (1) and the second power wave tower (2) is connected to an emergency pit (13). A pipeline on one side of the emergency pit (13) is connected to a return pump (14). The other side of the return pump (14) away from the emergency pit (13) is respectively connected to the common pipelines of the first power wave tower (1) and the second power wave tower (2). A second power wave pump (15) is provided on one side of the second power wave tower (2). A pipeline on one side of the second power wave tower (2) is connected to a cyclone dehydrator (16). A pipeline on one side of the cyclone dehydrator (16) is connected to an electric demister (19). A pipeline on one side of the electric demister (19) is connected to a main fan (20).

2. A Kaldo furnace selenium-containing fume recovery device according to claim 1, characterized in that: The fire water pipeline (3) and the gravity settling chamber (5) are both provided with an emergency discharge port (4).

3. A Kaldo furnace selenium-containing fume recovery device according to claim 1, characterized in that: The common pipeline of the cyclone dehydrator (16) and one side of the electric mist eliminator (19) is connected to a pit waste liquid tank (17), and an external discharge pump (18) is provided on one side of the pit waste liquid tank (17).

4. A Kaldo furnace selenium-containing fume recovery device according to claim 1, characterized in that: An overflow liquid receiving port is provided on one side of the first-stage power wave tower (1), and the overflow liquid receiving port is connected to the second-stage power wave tower (2) through a pipeline.

5. A Kaldo furnace selenium-containing fume recovery device according to claim 1, characterized in that: One side of the booster pump (7) is externally connected to a workshop water supply pipeline.

6. A Kaldo furnace selenium-containing fume recovery device according to claim 3, characterized in that: A first-stage power wave tower overflow liquid receiving port is provided on one side of the pit waste liquid tank (17).

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