Converter flue gas purification system

Abstract

The utility model discloses a converter flue gas purification system, and solves the technical problems in the prior art that the water content of converter flue gas sent out by a washing tower is relatively high, and when the converter flue gas is directly sent into a gas holder, a large amount of water and impurities such as hydrogen sulfide are gathered, so that a bottom plate of the gas holder is corroded, and safety accidents are caused. The converter flue gas purification system comprises a multifunctional tower, an atomization system and a dehydration system, wherein an exhaust port of a converter flue gas exhaust unit is communicated with the multifunctional tower; the atomizing end of the atomizing system is arranged at the air inlet end of the multifunctional tower; and the dehydration system is arranged in the multifunctional tower. According to the converter flue gas purification system, the temperature and the dust content of converter flue gas can be reduced through the atomization system, and the water content of the converter flue gas is reduced through the dehydration system, so that the cleanliness and the drying degree of the converter flue gas are improved, and the situation that a gas chamber is corroded due to the influence of water, hydrogen sulfide and other impurities in the converter flue gas is avoided; the converter flue gas purification system solves the problems of large water displacement of the gas holder and chimney raining, and prolongs the service life of the converter flue gas purification system.

Description

Technical Field

[0001] The present application belongs to the technical field of converter flue gas treatment, and specifically relates to a converter flue gas purification system. Background Art

[0002] The converter flue gas sent out by long-process steel mills contains a large amount of dust. Before collection or discharge, it needs to be treated by spraying water (mist) in a washing tower before it can be transferred to subsequent units (gas recovery unit or flue gas release unit) for recovery or discharge.

[0003] However, the water content of converter flue gas after being treated by water spray (mist) in the scrubber is high, and sending it directly to the flue gas venting unit will cause raining in the venting chimney;

[0004] However, the drains in the gasholders within the gas recovery unit are unable to meet the high-water-volume drainage requirements. If flue gas with a high water content enters the gasholder, a large amount of residual water will remain inside the gasholder. This residual water contains impurities such as hydrogen sulfide, creating a corrosive atmosphere within the gasholder and causing corrosion on the gasholder floor. These problems can damage equipment in the converter steelmaking dust removal system and easily lead to safety accidents. Therefore, the development of a purification system that can effectively reduce the water content of converter flue gas is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, the present application provides a converter flue gas purification system to solve the technical problem that the converter flue gas sent out by the washing tower in the prior art has a high water content and is directly sent into the gas tank. A large amount of water and impurities such as hydrogen sulfide accumulate, which will cause corrosion of the bottom plate of the gas tank and cause safety accidents.

[0006] The technical solutions adopted to achieve the purpose of this application are:

[0007] A converter flue gas purification system comprises a multifunctional tower, an atomization system and a dehydration system;

[0008] The air inlet end of the multifunctional tower is connected to the exhaust port of the converter fume exhaust unit, and the air outlet end of the multifunctional tower is connected to the gas tank and the venting chimney;

[0009] The spray end of the atomization system is arranged at the air inlet end of the multifunctional tower, and is used to spray water mist onto the converter flue gas entering the multifunctional tower;

[0010] The working end of the dehydration system is arranged inside the multifunctional tower and is used to reduce the water content of the converter flue gas.

[0011] In order to better realize the present application, further optimization is made in the above structure, wherein the dehydration system includes a solution regeneration device, an infusion pump and a solution nozzle;

[0012] A drain outlet is provided at the bottom of the multifunctional tower, and the drain outlet is connected to the liquid inlet of the solution regeneration device;

[0013] The solution nozzle is arranged inside the multifunctional tower, and the liquid outlet of the solution regeneration device is communicated with the solution nozzle through the infusion pump.

[0014] In order to better realize the present application, further optimization is made in the above structure, and the number of the solution nozzles is multiple groups, and the multiple groups of solution nozzles are arranged in sequence from bottom to top inside the multifunctional tower.

[0015] In order to better realize the present application, further optimization is made in the above structure, wherein the dehydration system further includes a solid dehydration device;

[0016] The solid dehydration device is arranged inside the multifunctional tower, and the solid dehydration device is located between the solution nozzle and the gas outlet end of the multifunctional tower.

[0017] In order to better realize the present application, further optimization is made in the above structure, wherein the solution regeneration device includes a liquid storage tank and a heating device;

[0018] The liquid inlet of the liquid storage tank is connected to the drain outlet, and the liquid outlet of the liquid storage tank is connected to the solution nozzle through the infusion pump;

[0019] The heating end of the heating device is arranged inside the liquid storage tank.

[0020] In order to better realize the present application, further optimization is made in the above structure, wherein the solution regeneration device further includes a filtration system for filtering particulate matter;

[0021] The drain port is communicated with the liquid inlet of the liquid storage tank through the filtering system.

[0022] In order to better realize the present application, the above structure is further optimized, and a blower is provided at the air inlet end of the multifunctional tower;

[0023] The exhaust port of the converter flue gas exhaust unit is connected to the air inlet end of the multifunctional tower through the blower, and the blower can deliver the converter flue gas discharged from the converter flue gas exhaust unit into the multifunctional tower;

[0024] The spray end of the atomization system is located at the air outlet end of the blower.

[0025] In order to better realize the present application, further optimization is made in the above structure, wherein the atomization system includes an atomization nozzle and an industrial water preparation device;

[0026] The atomizing nozzle is arranged at the air inlet end of the multifunctional tower, and the water outlet end of the industrial water preparation device is communicated with the atomizing nozzle.

[0027] In order to better realize the present application, further optimization is made in the above structure, and the gas outlet end of the multifunctional tower is provided with a three-way pipe; the gas outlet end of the multifunctional tower is connected with the gas tank and the discharge chimney respectively through the three-way pipe.

[0028] In order to better realize the present application, further optimization is made in the above structure, and a three-way switching valve capable of controlling the opening and closing of the two air outlet ends of the three-way pipe is provided in the three-way pipe.

[0029] It can be seen from the above technical solution that the converter flue gas purification system provided in this application can reduce the temperature and dust content of the converter flue gas through the atomization system arranged inside the multi-functional tower, and reduce the water content of the converter flue gas through the dehydration system, so as to improve the cleanliness and dryness of the converter flue gas, avoid the gas holder from being affected by the large amount of water vapor in the converter flue gas and causing corrosion, solve the problem of large drainage volume of the gas holder, avoid rain in the chimney, and thus improve the service life of the converter flue gas purification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a converter flue gas purification system provided in this application;

[0031] Figure 2 This is a structural schematic diagram of a multifunctional tower in a converter flue gas purification system provided in this application;

[0032] Figure 3 This is a structural diagram of an atomization system in a converter flue gas purification system provided in this application;

[0033] Figure 4 This is a structural schematic diagram of a dehydration system (without a solid dehydration device) in a converter flue gas purification system provided in this application.

[0034] Description of reference numerals:

[0035] 1-Multifunctional tower;

[0036] 2- atomization system, 21- atomization nozzle, 22- industrial water preparation device;

[0037] 3-dehydration system, 31-solution regeneration device, 311-liquid storage tank, 312-heating device, 313-filtration system, 32-infusion pump, 33-solution nozzle, 34-solid dehydration device;

[0038] 4- blower;

[0039] 5- tee pipe;

[0040] 6-Converter flue gas exhaust unit. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to which this application belongs to understand this application more clearly, the technical solution of this application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0042] In the embodiments of this application, Figures 1 to 4 As shown, the converter flue gas purification system includes a multifunctional tower 1 and an atomization system 2 and a dehydration system 3 arranged inside the multifunctional tower 1; wherein,

[0043] The air inlet of the multifunctional tower 1 is connected to the exhaust port of the converter flue gas exhaust unit 6, and the air outlet of the multifunctional tower 1 is connected to the gas tank and the vent chimney. The converter flue gas sent by the converter flue gas exhaust unit 6 can be processed by the multifunctional tower 1 and then collected into the gas tank according to demand, or directly discharged to the outside through the vent chimney. Figure 1 , Figure 1 The hollow arrows in the figure represent the flow direction of converter flue gas;

[0044] Specifically, the spray end of the atomizing system 2 is arranged at the air inlet end of the multifunctional tower 1, and can spray water mist onto the converter flue gas entering the multifunctional tower 1, so that the converter flue gas changes from unsaturated gas to saturated gas. At this time, the temperature of the converter flue gas is reduced, and most of the dust in the converter flue gas agglomerates and grows and falls under the action of gravity, thereby achieving the purpose of reducing the dust content;

[0045] Then, the converter flue gas will enter the interior of the multifunctional tower 1 and move toward the gas outlet end of the multifunctional tower 1;

[0046] When the converter flue gas enters the interior of the multifunctional tower 1, the dehydration system 3 can dehydrate the converter flue gas to reduce the water content of the converter flue gas and improve its dryness;

[0047] Subsequently, the converter flue gas flows from the gas outlet end of the multifunctional tower 1 to the vent chimney and is discharged outwards from the vent chimney, or flows from the gas outlet end of the multifunctional tower 1 to the gas tank for storage. Since the water content of the converter flue gas is reduced, no corrosive atmosphere will be generated in the gas tank, thereby avoiding the corrosion of the gas tank, thereby ensuring the service life of the converter flue gas purification system.

[0048] In some embodiments, the above-mentioned dehydration system 3 includes a solution regeneration device 31, an infusion pump 32 and a solution nozzle 33; wherein,

[0049] A drain outlet is provided at the bottom of the multifunctional tower 1, which is connected to the liquid inlet of the solution regeneration device 31;

[0050] The solution nozzle 33 is arranged inside the multifunctional tower 1;

[0051] The solution regeneration device 31 stores lithium bromide solution, and the liquid outlet of the solution regeneration device 31 is connected to the solution nozzle 33 through the infusion pump 32;

[0052] When it is necessary to dehydrate the converter flue gas inside the multifunctional tower 1, the staff can start the infusion pump 32, and suck the lithium bromide solution in the solution regeneration device 31 to the solution nozzle 33 through the infusion pump 32, and evenly spray it into the interior of the multifunctional tower 1 through the solution nozzle 33, so that the moisture in the converter flue gas is absorbed by the lithium bromide solution, and at the same time, the temperature of the converter flue gas is reduced, so as to achieve a good dehydration and cooling effect. Figure 1 , Figure 1 The black arrows in the middle indicate the flow direction of lithium bromide;

[0053] In addition, when the lithium bromide solution is sprayed, the residual dust in the converter flue gas will further agglomerate to form particulate matter, and fall to the bottom of the multifunctional tower 1 under the action of gravity, so as to achieve the purpose of reducing the dust content.

[0054] It is worth noting that the attraction between lithium bromide molecules in the lithium bromide solution and water molecules is stronger than the attraction between water molecules. Also, because the presence of lithium bromide molecules in a unit volume of liquid reduces the number of water molecules, under the same temperature conditions, the number of water molecules in the converter flue gas that comes into contact with the lithium bromide solution in the multifunctional tower 1 is significantly reduced, thereby achieving a corresponding dehydration effect. Preferably, the solution nozzles 33 are provided in multiple groups, and the multiple groups of solution nozzles 33 are sequentially arranged from bottom to top within the multifunctional tower 1 to increase the contact time and contact volume between the lithium bromide solution and the converter flue gas, thereby further improving the dehydration effect of the dehydration system 3. See Figure 1 、 Figure 2 and Figure 4 Only two groups of solution nozzles 33 are drawn in the figure, but this does not mean that only two groups of solution nozzles 33 can be set. The specific number of settings can be increased or decreased according to the water content of the converter flue gas in the gas tank, that is, to ensure that the water content of the converter flue gas will not produce residual water in the gas tank.

[0055] In some embodiments, the above-mentioned dehydration system 3 further includes a solid dehydration device 34; wherein,

[0056] The solid dehydration device 34 is arranged inside the multifunctional tower 1, and the solid dehydration device 34 is located between the solution nozzle 33 and the gas outlet end of the multifunctional tower 1, see Figure 1 and Figure 2 The mechanical water in the converter flue gas passing through the solution nozzle 33 will be intercepted when passing through the solid dehydration device 34, so as to further improve the dehydration effect of the dehydration system 3. Preferably, the solid dehydration device 34 is a wire mesh demister.

[0057] It should be noted that the mechanical water mentioned above refers to the water that exists in the converter gas in the form of droplets, that is, the water that is condensed after cooling and does not drip.

[0058] In some embodiments, the solution regeneration device 31 includes a liquid storage tank 311 and a heating device 321. Figure 4 ;in,

[0059] The heating end of the heating device 321 is arranged inside the liquid storage tank 311, the liquid inlet of the liquid storage tank 311 is connected to the drain outlet, and the liquid outlet of the liquid storage tank 311 is connected to the solution nozzle 33 through the infusion pump 32;

[0060] The condensed water and lithium bromide solution can form a mixed liquid when dripping and flow into the liquid storage tank 311 through the drain outlet of the multifunctional tower 1. The mixed liquid is then heated by the heating device 321 to evaporate the water in the mixed liquid to obtain a clean lithium bromide solution, that is, the water and the lithium bromide solution are separated;

[0061] The clean lithium bromide solution in the liquid storage tank 311 can flow from the liquid outlet end of the liquid storage tank 311 to the solution nozzle 33 under the suction action of the infusion pump 32, and be sprayed into the multifunctional tower 1 through the solution nozzle 33. The solution regeneration device 31 can separate the water in the lithium bromide solution so that the lithium bromide solution can be recycled, thereby reducing the dehydration cost of the converter flue gas purification system.

[0062] In some embodiments, the solution regeneration device 31 further includes a filtration system 313 for filtering particulate matter;

[0063] The drain outlet is connected to the liquid inlet of the liquid storage tank 311 through the filter system 313. The mixed liquid discharged through the drain outlet also contains a large amount of agglomerated particles, which are filtered out when passing through the filter system 313, so that the solid particles and the mixed liquid can be completely separated, and the mixed liquid can smoothly pass through the filter system 313 and enter the liquid storage tank 311. Preferably, the above-mentioned filter system can be a sedimentation tank or a filter tank.

[0064] In some embodiments, the air inlet end of the multifunctional tower 1 is provided with a blower 4, see Figure 1 The air inlet end of the multifunctional tower 1 is connected to the exhaust port of the converter flue gas exhaust unit 6 through the blower 4, and the converter flue gas discharged from the converter flue gas exhaust unit 6 is sent into the multifunctional tower 1 through the blower 4;

[0065] The spray end of the above-mentioned atomization system 2 is located at the air outlet end of the blower 4.

[0066] In some embodiments, the above-mentioned atomization system 2 includes an atomization nozzle 21 and an industrial water preparation device 22, see Figure 3 ;

[0067] Atomizing nozzle 21 is disposed at the air inlet of multifunctional tower 1, and the water outlet of industrial water preparation device 22 is connected to atomizing nozzle 21. Industrial water provided by industrial water preparation device 22 is sprayed into the converter flue gas through atomizing nozzle 21, thereby achieving effective cooling and dust removal effects. Preferably, industrial water preparation device 22 can be cooling water discharged from a boiler or other industrial equipment. Rational utilization of boiler water or cooling water discharged from other industrial equipment can reduce the cost of purifying the converter flue gas of the converter flue gas purification system.

[0068] In some embodiments, the gas outlet of the multifunctional tower 1 is provided with a three-way pipe 5, which is connected to the gas tank and the vent chimney respectively through the three-way pipe 5. Preferably, the three-way pipe 5 is provided with a three-way switching valve capable of controlling the opening and closing of the two gas outlet ends of the three-way pipe 5. By controlling the opening and closing of the two three-way switching valves, the direction of the converter flue gas can be controlled, that is, the collection and discharge of the converter flue gas can be achieved, thereby making the use of the converter flue gas purification system more convenient. Preferably, the three-way switching valve is a solenoid valve, which can be opened and closed by an electronic control system, so that the operation of the three-way switching valve is more convenient.

[0069] Through the above embodiments, the present application has the following beneficial effects or advantages:

[0070] 1) The converter flue gas purification system can reduce the temperature and dust content of the converter flue gas through the atomization system 2 arranged inside the multifunctional tower, and reduce the water content of the converter flue gas through the dehydration system 3, so as to improve the cleanliness and dryness of the converter flue gas, avoid the corrosion of the gas holder caused by the large amount of water vapor in the converter flue gas, solve the problem of large drainage volume of the gas holder, and avoid rain in the chimney, thereby improving the service life of the converter flue gas purification system.

[0071] 2) The solution regeneration device 31 in the converter flue gas purification system can separate the lithium bromide solution from the water in the mixed solution, so that the lithium bromide solution can be reused and recycled, thereby effectively reducing the dehydration cost of the converter flue gas purification system.

[0072] 3) The atomization system 2 in the converter flue gas purification system includes an atomization nozzle 21 and an industrial water preparation device 22. The industrial water preparation device 22 can be a boiler or other industrial equipment. The water discharged from the boiler or other industrial equipment is used to cool and remove dust from the converter flue gas, so as to further reduce the cost of purifying the converter flue gas by the converter flue gas purification system.

[0073] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0074] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A converter flue gas purification system, characterized in that: It comprises a multifunctional tower (1), an atomization system (2) and a dehydration system (3); The air inlet end of the multifunctional tower (1) is in communication with the exhaust port of the converter fume exhaust unit (6), and the air outlet end of the multifunctional tower (1) is in communication with the gas tank and the venting chimney; The spray end of the atomization system (2) is arranged at the air inlet end of the multifunctional tower (1) and is used to spray water mist onto the converter flue gas entering the multifunctional tower (1); The working end of the dehydration system (3) is arranged inside the multifunctional tower (1) and is used to reduce the water content of the converter flue gas.

2. The converter flue gas purification system according to claim 1, characterized in that: The dehydration system (3) includes a solution regeneration device (31), an infusion pump (32) and a solution nozzle (33); The bottom of the multifunctional tower (1) is provided with a drain outlet, which is connected to the liquid inlet of the solution regeneration device (31); The solution nozzle (33) is arranged inside the multifunctional tower (1), and the liquid outlet of the solution regeneration device (31) is connected to the solution nozzle (33) through the infusion pump (32).

3. The converter flue gas purification system according to claim 2, characterized in that: There are multiple groups of the solution nozzles (33), and the multiple groups of the solution nozzles (33) are sequentially arranged from bottom to top inside the multifunctional tower (1).

4. The converter flue gas purification system according to claim 2, characterized in that: The dehydration system (3) further comprises a solid dehydration device (34); The solid dehydration device (34) is arranged inside the multifunctional tower (1), and the solid dehydration device (34) is located between the solution nozzle (33) and the gas outlet end of the multifunctional tower (1).

5. The converter flue gas purification system according to claim 2, characterized in that: The solution regeneration device (31) includes a liquid storage tank (311) and a heating device (312); The liquid inlet of the liquid storage tank (311) is connected to the drain outlet, and the liquid outlet of the liquid storage tank (311) is connected to the solution nozzle (33) through the infusion pump (32); The heating end of the heating device (312) is arranged inside the liquid storage tank (311).

6. The converter flue gas purification system according to claim 5, characterized in that: The solution regeneration device (31) further includes a filtering system (313) for filtering particulate matter; The drain port is connected to the liquid inlet of the liquid storage tank (311) through the filtering system (313).

7. The converter flue gas purification system according to claim 1, characterized in that: The air inlet end of the multifunctional tower (1) is provided with a blower (4); The exhaust port of the converter flue gas exhaust unit (6) is connected to the air inlet end of the multifunctional tower (1) through the blower (4), and the blower (4) is capable of sending the converter flue gas discharged from the converter flue gas exhaust unit (6) into the multifunctional tower (1); The spray end of the atomization system (2) is located at the air outlet end of the blower (4).

8. The converter flue gas purification system according to claim 1, characterized in that: The atomization system (2) includes an atomization nozzle (21) and an industrial water preparation device (22); The atomizing nozzle (21) is arranged at the air inlet end of the multifunctional tower (1), and the water outlet end of the industrial water preparation device (22) is connected to the atomizing nozzle (21).

9. The converter flue gas purification system according to claim 1, characterized in that: The gas outlet end of the multifunctional tower (1) is provided with a three-way pipe (5); the gas outlet end of the multifunctional tower (1) is respectively connected to the gas tank and the emission chimney through the three-way pipe (5).

10. The converter flue gas purification system according to claim 1, characterized in that: The three-way pipe (5) is provided with a three-way switching valve capable of controlling the opening and closing of the two gas outlet ends of the three-way pipe (5).

Images