Acid regeneration method and device

Abstract

The invention relates to an acid regeneration method and device, and belongs to the technical field of acid regeneration environmental protection, and the method is characterized by comprising the following steps: S100, a furnace starting stage: igniting and baking a roasting furnace, and after the baking furnace reaches a temperature, carrying out water spraying operation, namely sequentially carrying out water operation, acid regeneration operation and acid waste operation; s110, water operation: spraying water into the roasting furnace; s120, regenerated acid operation, wherein regenerated acid is sprayed into the roasting furnace through a preconcentrator; s130, waste acid operation, wherein waste acid is sprayed into the roasting furnace through a preconcentrator; s200, an operation stage; s300, the furnace is shut down; and S400, carrying out water operation for 2 hours again. The method has the effect of enabling the acid regeneration waste gas to reach the standard.

Description

Technical Field

[0001] This application relates to the field of environmentally friendly acid regeneration, and in particular to an acid regeneration method and apparatus. Background Technology

[0002] Acid regeneration is an important industrial technology, mainly used to treat waste acid generated by industries such as steel, to achieve resource recovery and environmental protection. Its core processes include high-temperature roasting, high-temperature pyrolysis, and concentration crystallization. It can not only effectively treat pollutants, but also convert waste acid into reusable resources, which has significant economic and environmental benefits.

[0003] The acid regeneration process generates and emits waste gas containing harmful substances such as particulate matter, nitrogen oxides, and sulfides. If the harmful substances in the emitted waste gas exceed the standards, it will damage the environment and cause environmental problems. Summary of the Invention

[0004] To ensure that the acid regeneration waste gas meets the standards, this application provides an acid regeneration method and apparatus.

[0005] The acid regeneration method provided in this application adopts the following technical solution: An acid regeneration method includes the following steps: S100, during the start-up stage, the roasting furnace is ignited and baked. After the furnace reaches the required temperature, water spraying is carried out, which involves water treatment, regenerated acid treatment, and waste acid treatment in sequence. S110, water spraying, spraying water into the roasting furnace; S120, regenerated acid operation, is used to spray regenerated acid into the roasting furnace through a pre-concentrator; S130, waste acid operation, waste acid is sprayed into the roasting furnace through the pre-concentrator; S200, Operation Phase; S300, furnace shutdown; S400, another 2 hours of water operation.

[0006] By adopting the above technical solutions, the original water-based and acid-based processes are replaced with water-based, regenerated acid-based, and waste acid-based processes, thereby reducing particulate matter in the exhaust gas during the start-up phase and ensuring that the exhaust gas meets the standards during the start-up phase.

[0007] Optionally, during the baking stage of the S100 roasting furnace, the temperature of the furnace chamber is controlled at 500-560℃, and the temperature of the furnace top is controlled at 400-460℃.

[0008] Optionally, in S110, the furnace temperature of the roasting furnace is controlled at 500-560℃, the furnace top temperature is controlled at 400-420℃, and after spraying water for 2 hours, regenerated acid is added to the pre-concentrator.

[0009] Optionally, in S120, regenerated acid is sprayed into the roasting furnace. The amount of regenerated acid added is controlled at 1-3 cubic meters, the injection time is 10-15 minutes, and the furnace temperature is controlled at 500-560℃ and the furnace top temperature is controlled at 380-400℃. 15 minutes after the injection is completed, waste acid is added into the pre-concentrator.

[0010] Optionally, in S130, the waste acid injection time is controlled at 1-2 hours, the furnace temperature of the roasting furnace is controlled at 500-530℃, and the furnace top temperature is controlled at 380-400℃.

[0011] Optionally, in S200, the furnace temperature of the roasting furnace is controlled at 500-530℃, the furnace top temperature is controlled at 380-400℃, the content of acid corrosion inhibitor is controlled below 20%, the air-fuel ratio is controlled at 12-12.8, and the oxygen content is controlled at 7-8%.

[0012] By adopting the above technical solutions, the nitrogen content of acid corrosion inhibitors is reduced, nitrogen sources are reduced, furnace temperature is lowered, and nitrogen gas conversion into nitrides is reduced, thereby ensuring that the nitride content in the exhaust gas does not exceed the standard.

[0013] This application also provides an apparatus for using an acid regeneration method, which adopts the following technical solution: An apparatus for acid regeneration includes a roasting furnace, which comprises a furnace top, a furnace chamber, and a furnace bottom. Multiple evenly distributed burners are arranged on the furnace chamber. An exhaust port is provided on the furnace top, and spray guns facing the furnace chamber are arranged around the exhaust port. A discharge port is provided at the bottom of the furnace bottom. A cyclone separator is connected to the exhaust port, and the cyclone separator is also connected to a pre-concentrator. A reflux channel connecting to the furnace chamber is provided at the lower end of the cyclone separator, and the pre-concentrator is also connected to the spray guns.

[0014] By adopting the above technical solution, water, regenerated acid, and waste acid are sprayed into the furnace by the spray gun. The burner in the furnace adjusts the temperature to the corresponding temperature, and the flue gas is discharged through the gas outlet above, thereby completing the roasting operation of acid regeneration.

[0015] Optionally, the spray gun is rotatably connected to a hollow rotating head at one end inside the roasting furnace. The rotating head has a spiral guide plate inside. The outside of the rotating head is also provided with multiple nozzles that communicate with the inside of the rotating head. The nozzles are duckbill-shaped and are tilted downwards. The nozzles also have two opposing elastic plates inside. One end of the elastic plate is fixed inside the nozzle, and the other ends of the two elastic plates gradually approach each other in a direction away from the rotating head.

[0016] By adopting the above technical solution, the liquid enters the rotating head through the spray gun. The liquid impacts the spiral guide plate, thereby driving the rotating head to rotate. The rotating head drives the nozzle to rotate, causing the liquid to be sprayed in all directions. At the same time, the nozzle-shaped nozzle can spray the liquid out flat, so that the sprayed liquid can be quickly roasted in the furnace, improving the reaction efficiency. When the liquid passes through the nozzle, the elastic plate inside the nozzle vibrates under the impact of the liquid, thereby quickly spreading and dispersing the liquid further, so that the sprayed liquid remains in a dispersed state.

[0017] Optionally, the furnace top, furnace chamber, and furnace bottom of the roasting furnace are each provided with heat exchange tubes, which are coiled inside the roasting furnace. A combustion-supporting tube is also provided on one side of the roasting furnace. A preheating assembly is provided between the combustion-supporting tube and the roasting furnace. The preheating assembly includes a shell installed on the roasting furnace. Multiple baffles are provided inside the shell. The baffles are inclined, and the inclination directions of adjacent baffles are opposite. Each pair of adjacent baffles forms a channel, and the two adjacent channels are respectively connected to the heat exchange tube and the combustion-supporting tube.

[0018] By adopting the above technical solution, heat exchange media of different temperatures are introduced into the heat exchange tubes, thereby adjusting the temperature of the furnace top, furnace chamber and furnace bottom within a certain range. This allows the temperature of each part inside the roasting furnace to be controlled, ensuring that the temperature inside the roasting furnace meets the requirements for acid regeneration. At the same time, the heat exchange media in the heat exchange tubes, after heat exchange, carries heat into the preheating components. The heat exchange media flows in the channel formed by two baffles, and the adjacent channel carries combustion-supporting gas, thereby heating the combustion-supporting gas. This allows the combustion-supporting gas to quickly participate in the combustion reaction after entering the roasting furnace through the combustion-supporting tube, improving combustion efficiency.

[0019] Optionally, the furnace bottom of the roasting furnace is also provided with two crushing rollers arranged opposite each other. Both ends of the crushing rollers are provided with rotating rods, and fan blades are provided on the rotating rods. The interior of the furnace bottom is provided with a drive channel, which is connected to the heat exchange tube. Some of the fan blades on the rotating rods are located inside the drive channel.

[0020] By adopting the above technical solution, the heat exchange medium in the heat exchange tube flows along the drive channel. By applying a thrust to the fan blade, the rotating rod rotates, which in turn drives the two crushing rollers to rotate. Solid material enters the discharge port at the bottom of the furnace. The crushing rollers at the discharge port rotate and crush the solid material, making the discharge finer and facilitating the next process step.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. By adopting water-based operation, regenerated acid operation, and waste acid operation methods, the particulate matter in the exhaust gas during the start-up stage is reduced, thereby ensuring that the exhaust gas meets the standards during the start-up stage. 2. Reduce the nitrogen content of acid corrosion inhibitors, reduce nitrogen sources, lower furnace temperature, and reduce the conversion of nitrogen gas into nitrides, thereby ensuring that the nitride content in the exhaust gas does not exceed the standard; 3. The roasting furnace controls the amount and temperature of spraying through spraying and heat exchange, thereby improving the combustion efficiency and quality inside the furnace. Attached Figure Description

[0022] Figure 1 This is a flowchart of an embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the overall structure of the roasting furnace according to an embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the internal structure of the roasting furnace according to an embodiment of this application.

[0025] Figure 4 yes Figure 3 Enlarged schematic diagram of part A in the middle.

[0026] Figure 5 This is a schematic diagram of the preheating component according to an embodiment of this application.

[0027] Figure 6 This is a schematic diagram of the structure of the crushing roller according to an embodiment of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Roasting furnace; 2. Furnace top; 21. Gas outlet; 3. Furnace chamber; 31. Burner; 4. Furnace bottom; 41. Material outlet; 5. Rotating head; 51. Guide plate; 52. Nozzle; 53. Elastic sheet; 6. Heat exchange tube; 7. Combustion aid tube; 8. Preheating assembly; 81. Shell; 82. Baffle; 9. Crushing roller; 91. Rotating rod; 92. Fan blade. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings.

[0030] This application discloses an acid regeneration method.

[0031] Reference Figure 1 An acid regeneration method includes the following steps: S100, during the start-up stage, the roasting furnace is ignited and baked. The temperature of the furnace chamber is controlled at 500-560℃, and the temperature of the furnace top is controlled at 400-460℃. After the furnace reaches the temperature, water spraying is carried out, that is, water baking, regenerated acid baking and waste acid baking are carried out in sequence. S110, water spraying, spray water into the roasting furnace, the furnace temperature of the roasting furnace is controlled at 500-560℃, the temperature of the furnace top is controlled at 400-420℃, the water spraying flow rate is half of the normal spraying volume, after spraying water for 2 hours, add regenerated acid into the pre-concentrator. S120, regenerated acid operation: Regenerated acid is sprayed into the roasting furnace through the pre-concentrator. The amount of regenerated acid sprayed into the roasting furnace is half of the normal amount. The amount of regenerated acid added is controlled at 1-3 cubic meters, and the injection time is 10-15 minutes. The furnace temperature of the roasting furnace is controlled at 500-560℃, and the furnace top temperature is controlled at 380-400℃. 15 minutes after the injection is completed, waste acid is added into the pre-concentrator. S130, waste acid operation, waste acid is sprayed into the roasting furnace through the pre-concentrator. The amount of waste acid sprayed is gradually increased until it returns to the normal amount. The waste acid injection time is controlled at 1-2 hours. The furnace temperature of the roasting furnace is controlled at 500-530℃ and the furnace top temperature is controlled at 380-400℃. During the S200 operation phase, the furnace temperature of the roasting furnace is controlled at 500-530℃, the furnace top temperature is controlled at 380-400℃, the acid corrosion inhibitor content is controlled below 20%, the air-fuel ratio is controlled at 12-12.8, and the oxygen content is controlled at 7%-8%. S300, furnace shutdown; S400, another 2 hours of water operation.

[0032] The implementation principle of this embodiment is as follows: the original water-based and acid-based processes are changed to water-based, regenerated acid-based, and waste acid-based processes, thereby reducing the particulate matter in the exhaust gas during the start-up stage, so that the exhaust gas meets the standards during the start-up stage, reducing the nitrogen content of the acid corrosion inhibitor, reducing the nitrogen source, reducing the furnace temperature, and reducing the conversion of nitrogen gas into nitrides, thereby ensuring that the nitrides in the exhaust gas do not exceed the standard.

[0033] This application also discloses an apparatus for using an acid regeneration method.

[0034] Reference Figure 2 and Figure 3 An apparatus for applying an acid regeneration method includes a roasting furnace 1. The roasting furnace 1 includes a furnace top 2, a furnace chamber 3, and a furnace bottom 4 arranged sequentially from top to bottom. A plurality of evenly distributed burners 31 are arranged on the furnace chamber 3. The furnace top 2 is provided with an air outlet 21, and spray guns facing the furnace chamber 3 are arranged around the air outlet 21. A discharge port 41 is provided at the bottom of the furnace bottom 4. The air outlet 21 is used to connect to a cyclone separator. The cyclone separator is also connected to a pre-concentrator. A return channel connecting the furnace chamber 3 is provided at the lower end of the cyclone separator. The pre-concentrator is also connected to the spray guns. The cyclone separator and the pre-concentrator are not shown in the figure.

[0035] The pre-concentrator sprays regenerated acid and waste acid into the furnace 3 through a spray gun. While spraying water, regenerated acid and waste acid, the burner 31 in the furnace 3 adjusts the temperature to the corresponding temperature. The flue gas is discharged through the upper outlet 21 and passes through the cyclone separator and pre-concentrator. It then enters the roasting furnace 1 along with the regenerated acid and waste acid, thus completing the roasting operation of acid regeneration.

[0036] Reference Figure 3 and Figure 4 The spray gun is rotatably connected to a hollow rotating head 5 at one end inside the roasting furnace 1. A spiral guide plate 51 is fixedly installed inside the rotating head 5. Multiple nozzles 52 communicating with the inside of the rotating head 5 are also provided on the outside of the rotating head 5. The nozzles 52 are duckbill shaped and are inclined downward. Two opposing elastic plates 53 are provided inside the nozzles 52. One end of the elastic plate 53 is fixed inside the nozzle 52, and the other ends of the two elastic plates 53 gradually approach each other in the direction away from the rotating head 5. The liquid enters the rotating head 5 through the spray gun. The liquid impacts the spiral guide plate 51, thereby driving the rotating head 5 to rotate. The rotating head 5 drives the nozzle 52 to rotate, causing the liquid to spray in all directions. At the same time, the nozzle 52 can spray the liquid out in a flat manner, so that the sprayed liquid can be quickly roasted in the furnace 3, improving the reaction efficiency. When the liquid passes through the nozzle 52, the elastic plate 53 inside the nozzle 52 vibrates under the impact of the liquid, thereby quickly spreading and dispersing the liquid further, so that the sprayed liquid remains in a dispersed state.

[0037] Reference Figure 2 , Figure 3 and Figure 4 The furnace top 2, furnace chamber 3, and furnace bottom 4 of the roasting furnace 1 are each equipped with heat exchange tubes 6. The heat exchange tubes 6 are coiled inside the roasting furnace 1. A combustion-supporting tube 7 is also provided on one side of the roasting furnace 1. A preheating component 8 is provided between the combustion-supporting tube 7 and the roasting furnace 1. The preheating component 8 includes a shell 81 installed on the roasting furnace 1. Multiple baffles 82 are provided inside the shell 81 to separate the interior of the shell 81. The baffles 82 are inclined and wavy. The inclination directions of two adjacent baffles 82 are opposite. Each pair of adjacent baffles 82 forms a channel. The two adjacent channels are connected to the heat exchange tubes 6 and the combustion-supporting tubes 7, respectively.

[0038] Heat exchange mediums of different temperatures are introduced into the heat exchange tubes 6, thereby adjusting the temperatures of the furnace top 2, furnace chamber 3, and furnace bottom 4 within a certain range. This allows for temperature control of various parts inside the roasting furnace 1, ensuring that the temperature inside the roasting furnace 1 meets the requirements for acid regeneration. Simultaneously, the heat exchange medium in the heat exchange tubes 6 carries heat into the preheating component 8 after heat exchange. The heat exchange medium flows in the channel formed by the two baffles 82, with the adjacent channel carrying combustion-supporting gas, thus heating the combustion-supporting gas. This allows the combustion-supporting gas to quickly participate in the combustion reaction after entering the roasting furnace 1 through the combustion-supporting tube 7, improving combustion efficiency.

[0039] Reference Figure 3 and Figure 5Two opposing crushing rollers 9 are also provided at the discharge port 41 of the furnace bottom 4 of the roasting furnace 1. Both ends of the crushing rollers 9 are fixed with coaxial rotating rods 91. Fan blades 92 are installed on the rotating rods 91. A drive channel is provided inside the furnace bottom 4. The drive channel is connected to the heat exchange tube 6. Some of the fan blades 92 on the rotating rods 91 are located inside the drive channel.

[0040] The heat exchange medium in the heat exchange tube 6 flows along the drive channel. By applying a thrust to the fan blade 92, the rotating rod 91 rotates, which in turn drives the two crushing rollers 9 to rotate. Solid material enters the discharge port 41 at the bottom of the furnace 4. The crushing rollers 9 at the discharge port 41 rotate and crush the solid material, making the discharge finer and facilitating the next process step.

[0041] The implementation principle of the apparatus for applying the acid regeneration method in this application embodiment is as follows: the temperature of the furnace 3 and the furnace top 2 is controlled by the flowing heat exchange medium inside the heat exchange tube 6 so that the temperature meets the process requirements. In addition, the heat exchanged can also be used to preheat the combustion gas and improve the combustion efficiency.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for acid regeneration, characterized in that: Includes the following steps, S100, during the start-up stage, the roasting furnace (1) is ignited and baked. After the furnace reaches the required temperature, water spraying is carried out, namely, water spraying, regenerated acid spraying and waste acid spraying are carried out in sequence. S110, water spraying, spraying water into the roasting furnace (1); S120, regenerated acid operation, regenerated acid is sprayed into the roasting furnace (1) through the pre-concentrator; S130, waste acid operation, waste acid is sprayed into the roasting furnace (1) through the pre-concentrator; S200, Operation Phase; S300, furnace shutdown; S400, another 2 hours of water operation.

2. The acid regeneration method according to claim 1, characterized in that: In the baking stage of the S100 roasting furnace (1), the temperature of the furnace chamber (3) is controlled at 500-560℃, and the temperature of the furnace top (2) is controlled at 400-460℃.

3. The acid regeneration method according to claim 2, characterized in that: In S110, the temperature of the furnace chamber (3) of the roasting furnace (1) is controlled at 500-560℃, and the temperature of the furnace top (2) is controlled at 400-420℃. After spraying water for 2 hours, regenerated acid is added to the pre-concentrator.

4. The acid regeneration method according to claim 3, characterized in that: In S120, regenerated acid is sprayed into the roasting furnace (1). The amount of regenerated acid added is controlled at 1-3 cubic meters, the injection time is 10-15 minutes, and the temperature of the furnace chamber (3) of the roasting furnace (1) is controlled at 500-560℃, and the temperature of the furnace top (2) is controlled at 380-400℃. 15 minutes after the injection is completed, waste acid is added into the pre-concentrator.

5. The acid regeneration method according to claim 4, characterized in that: In S130, the waste acid injection time is controlled at 1-2 hours, the furnace chamber (3) temperature of the roasting furnace (1) is controlled at 500-530℃, and the furnace top (2) temperature is controlled at 380-400℃.

6. The acid regeneration method according to claim 5, characterized in that: In S200, the temperature of the furnace chamber (3) of the roasting furnace (1) is controlled at 500-530℃, the temperature of the furnace top (2) is controlled at 380-400℃, the content of acid corrosion inhibitor is controlled below 20%, the air-fuel ratio is controlled at 12-12.8, and the oxygen content is controlled at 7-8%.

7. An apparatus for applying the acid regeneration method according to claim 6, characterized in that: The furnace includes a roasting furnace (1), which includes a furnace top (2), a furnace chamber (3) and a furnace bottom (4). The furnace chamber (3) is provided with multiple evenly distributed burners (31). The furnace top (2) is provided with an air outlet (21), and spray guns facing the furnace chamber (3) are provided around the air outlet (21). The bottom of the furnace bottom (4) is provided with a discharge port (41). The air outlet (21) is connected to a cyclone separator. The cyclone separator is also connected to a pre-concentrator. The lower end of the cyclone separator is provided with a return channel that connects to the furnace chamber (3). The pre-concentrator is also connected to the spray guns.

8. An acid regeneration device according to claim 7, characterized in that: The spray gun is rotatably connected to a hollow rotating head (5) at one end inside the roasting furnace (1). The rotating head (5) is provided with a spiral guide plate (51). The outside of the rotating head (5) is also provided with a plurality of nozzles (52) that communicate with the inside of the rotating head (5). The nozzles (52) are duckbill shaped and are inclined downward. The nozzles (52) are also provided with two opposing elastic plates (53) inside. One end of the elastic plate (53) is fixed inside the nozzle (52), and the other ends of the two elastic plates (53) gradually approach each other in a direction away from the rotating head (5).

9. An acid regeneration device according to claim 8, characterized in that: The furnace top (2), furnace chamber (3) and furnace bottom (4) of the roasting furnace (1) are each provided with heat exchange tubes (6). The heat exchange tubes (6) are coiled inside the roasting furnace (1). A combustion-supporting tube (7) is also provided on one side of the roasting furnace (1). A preheating component (8) is provided between the combustion-supporting tube (7) and the roasting furnace (1). The preheating component (8) includes a shell (81) installed on the roasting furnace (1). Multiple baffles (82) are provided inside the shell (81). The baffles (82) are inclined, and the two adjacent baffles (82) are inclined in opposite directions. Each pair of adjacent baffles (82) forms a channel. The two adjacent channels are connected to the heat exchange tubes (6) and the combustion-supporting tubes (7) respectively.

10. An acid regeneration device according to claim 8, characterized in that: The furnace bottom (4) of the roasting furnace (1) is also provided with two crushing rollers (9) arranged opposite each other. Both ends of the crushing rollers (9) are provided with rotating rods (91). The rotating rods (91) are provided with fan blades (92). The furnace bottom (4) is provided with a drive channel. The drive channel is connected to the heat exchange tube (6). Some of the fan blades (92) on the rotating rods (91) are located in the drive channel.

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