Metatitanic acid adiabatic evaporation device

Abstract

The utility model relates to a metatitanic acid adiabatic evaporation device in the technical field of titanium dioxide production equipment, which comprises a flash evaporator, a liquid outlet of the flash evaporator is sequentially communicated with a first liquid seal tank and a cooling pot, an exhaust port of the flash evaporator is sequentially communicated with a cyclone separator, a gas purification tower, a spray tower, a gas-liquid separator and a second liquid seal tank, a first spray pipe is arranged in the gas purification tower, and a second spray pipe is arranged in the gas purification tower. An exhaust port of the gas-liquid separator is connected with a vacuum pump; and the liquid seal groove II is communicated with a spraying pipe I of the gas purification tower through a water guide pipe. According to the utility model, metatitanic acid in the hydrolysis pot is subjected to adiabatic evaporation, cooling and concentration and then is used as a raw material for primary washing of titanium dioxide, steam with acid gas generated in the evaporation process is purified and sprayed, the acid gas is removed, and the steam with the acid gas is cooled and then is emptied, so that the atmosphere is not polluted, and condensed water can be recycled, so that the waste of water resources is avoided; the spraying effect is good, the filler layer can be efficiently replaced according to needs, the device can also be used for other spraying procedures, and the application range of the device is widened.

Description

Technical Field

[0001] The utility model belongs to the technical field of titanium dioxide production equipment, and specifically relates to a metatitanic acid adiabatic evaporation device. Background Art

[0002] Titanium dioxide, commonly known as titanium dioxide, is a white inorganic pigment. Titanium dioxide has strong adhesion and is not easy to undergo chemical changes. It is widely used in industrial fields such as coatings, plastics, papermaking, printing inks, chemical fibers, rubber, and cosmetics. The production process of titanium dioxide is long and involves multiple heating and cooling processes. Among them, after the hydrolysis is completed, the hydrolysis slurry (titanic acid) is about 100-110°C and needs to be cooled. In the prior art, a flash tank is used for flash cooling operations, but the steam generated by the flash tank contains acidic gases. If it is directly discharged, it is easy to pollute the environment and is not conducive to production. Therefore, a titanic acid adiabatic evaporation device is needed to solve the above technical problems. Utility Model Content

[0003] In view of the above-mentioned defects in the prior art, the utility model provides a metatitanic acid adiabatic evaporation device, including a flash evaporator, the liquid outlet of the flash evaporator is sequentially connected to a liquid seal tank 1 and a cooling pot, the exhaust port of the flash evaporator is sequentially connected to a cyclone separator, a gas purification tower, a spray tower, a gas-liquid separator and a liquid seal tank 2, the gas purification tower is provided with a spray pipe 1, and the exhaust port of the gas-liquid separator is connected to a vacuum pump;

[0004] The second liquid seal tank is connected to the first spray pipe of the air purification tower through a water pipe;

[0005] The material after hydrolysis in the hydrolysis pot is directly sent to the flash evaporator through a high-temperature material pump, and adiabatically evaporated, cooled and concentrated in the flash evaporator. After cooling, the titanic acid passes through the liquid seal tank 1 (metatinic acid liquid seal tank) and then enters the cooling pot to serve as the raw material for the first washing process of titanium dioxide; the steam evaporated in the flash evaporator passes through the cyclone separator for the first gas-liquid separator, the separated gas enters the air purification tower for cooling and then enters the spray tower for spraying to remove the acidic gas, and then enters the gas-liquid separator for gas-liquid separation again, the separated gas is extracted by a vacuum pump, and the separated liquid enters the liquid seal tank 2 (condensate liquid seal tank) and can be introduced into the air purification tower through a water pipe for reuse, thereby improving the utilization rate of resources and avoiding waste.

[0006] The spray tower includes a tower body and a tower cover, the tower cover is detachably connected to the tower body through a flange, a packing layer is provided in the tower body, a spray pipe 2 is provided above the packing layer, the spray pipe 2 is spiral-shaped, the lower surface of the spray pipe 2 is covered with spray holes, the center of the spray pipe 2 is fixedly connected with a vertical pipe, the upper end of the vertical pipe passes through the tower cover and is fixedly connected with a bevel gear 1, the bevel gear 1 is meshed with a bevel gear 2, the bevel gear 2 is connected with a stepper motor, the stepper motor is fixed on the tower cover, and the vertical pipe outside the tower cover is connected with a water inlet pipe through a rotary joint. The arrangement here allows the spray pipe 2 to be rotated during spraying, and because it is spiral-shaped, the spray range is more comprehensive when it is rotated, and the gas discharged from the packing layer contacts the spray liquid again, further improving the spraying effect.

[0007] Preferably, the tower body comprises a coaxial upper cylinder and a lower cylinder, the diameter of the upper cylinder is larger than the diameter of the lower cylinder, the bottom of the upper cylinder is fixedly connected to the top of the lower cylinder by a circular fixing plate, the outer edge of the packing layer is fixed with a fixing ring, the outer ring diameter of the fixing ring is equal to the inner diameter of the upper cylinder, the fixing ring is symmetrically provided with two screw holes, the two screw holes are threaded with vertical screws, the lower ends of the two vertical screws are respectively connected to forward and reverse motors after passing through the fixing plate, and the forward and reverse motors are located outside the upper cylinder and the lower cylinder. This arrangement allows the packing layer to be located at the junction of the upper cylinder and the lower cylinder during spraying, and the gas introduced into the lower cylinder passes through the packing layer and fully contacts with the spray liquid before entering the upper cylinder and being discharged. The spraying effect is improved, which is conducive to improving the efficiency of gas treatment. When the use time is too long or different packings are required for different gases, the tower cover is opened, and the packing layer moves up to the top of the upper cylinder when the forward and reverse motors rotate, which is convenient for replacing the packing in the packing layer.

[0008] Preferably, the tower cover is provided with a hanging ear and an exhaust pipe, the bottom of the tower body is provided with an air inlet pipe and a liquid outlet pipe, and the second spray pipe is fixed with a cross reinforcement rod, and the reinforcement rod is fixedly connected to the vertical pipe. The tower cover can be removed by a hanging device, which is convenient for maintenance of the tower body. At the same time, the reinforcement rod is provided to improve the stability of the second spray pipe during the rotation spraying process.

[0009] The utility model also includes other components that enable a metatitanic acid adiabatic evaporation device to be used normally, such as a control component of a forward and reverse motor, a control component of a stepper motor, a hydrolysis pot, a flash evaporator, a cooling pot, a cyclone separator, a gas-liquid separator, a control component of a gas purification tower, etc., which are all conventional technical means in the field. In addition, the devices or components not limited in the utility model, such as a hydrolysis pot, a flash evaporator, a cooling pot, a cyclone separator, a gas-liquid separator, a gas purification tower, a screw, a rotary joint, a packing layer, etc., all adopt conventional technical means and conventional equipment in the field.

[0010] The beneficial effects of the utility model are as follows: the metatitanic acid in the hydrolysis pot is subjected to adiabatic evaporation, cooling, and concentration before being used as a raw material for washing titanium dioxide; the steam with acidic gas generated in the evaporation process is purified and sprayed, and then the acidic gas is removed and the temperature is reduced before being discharged, so that the atmosphere will not be polluted; the condensed water can be reused, thus avoiding the waste of water resources; the setting of the spray tower in the process improves the spraying effect and efficiency; the packing layer can be efficiently replaced as needed, and can also be used for other spraying processes, thus improving the application scope of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of a metatitanic acid adiabatic evaporation device in an embodiment of the utility model;

[0013] Figure 2 for Figure 1 Structural diagram of the spray tower;

[0014] Figure 3 for Figure 2 Bottom view of middle spray pipe 2.

[0015] In the figure: 1. lower cylinder; 2. upper cylinder; 3. tower cover; 4. hanging ear; 5. stepping motor; 6. bevel gear one; 7. bevel gear two; 8. water inlet pipe; 9. exhaust pipe; 10. vertical screw; 11. fixing ring; 12. packing layer; 13. forward and reverse motor; 14. vertical pipe; 15. spray pipe two; 16. air inlet pipe; 17. liquid outlet pipe; 18. spray hole; 19. reinforcement rod. DETAILED DESCRIPTION

[0016] The present invention is described in detail below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description here is only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent replacements, improvements, etc., should be included in the protection scope of the present invention.

[0017] Example

[0018] like Figure 1-3 As shown, the utility model provides a metatitanic acid adiabatic evaporation device, including a flash evaporator, the liquid outlet of the flash evaporator is sequentially connected to a liquid seal tank 1 and a cooling pot, the exhaust port of the flash evaporator is sequentially connected to a cyclone separator, a gas purification tower, a spray tower, a gas-liquid separator and a liquid seal tank 2, the gas purification tower is provided with a spray pipe 1, and the exhaust port of the gas-liquid separator is connected to a vacuum pump;

[0019] The second liquid seal tank is connected with the first spray pipe of the air purification tower through a water pipe.

[0020] The spray tower includes a tower body and a tower cover 3, wherein the tower cover 3 is detachably connected to the tower body through a flange, a packing layer 12 is provided in the tower body, a spray pipe 15 is provided above the packing layer 12, the spray pipe 15 is spiral-shaped, and the lower surface of the spray pipe 15 is covered with spray holes 18, the center of the spray pipe 15 is fixedly connected with a vertical pipe 14, the upper end of the vertical pipe 14 passes through the tower cover 3 and is fixedly connected with a bevel gear 1 6, the bevel gear 1 6 is meshed with a bevel gear 2 7, the bevel gear 2 7 is connected with a stepping motor 5, the stepping motor 5 is fixed on the tower cover 3, and the vertical pipe 14 located outside the tower cover 3 is connected with a water inlet pipe 8 through a rotating joint. The arrangement at this place allows the spray pipe 15 to be rotated during spraying, and since it is spiral-shaped, the spraying range is more comprehensive when it is rotated, and the gas discharged from the packing layer 12 contacts the spray liquid again, further improving the spraying effect.

[0021] The tower body includes a coaxial upper cylinder 2 and a lower cylinder 1, wherein the diameter of the upper cylinder 2 is larger than the diameter of the lower cylinder 1, and the bottom of the upper cylinder 2 is fixedly connected to the top of the lower cylinder 1 through a circular fixing plate, and a fixing ring 11 is fixed to the outer edge of the packing layer 12, and the outer ring diameter of the fixing ring 11 is equal to the inner diameter of the upper cylinder 2, and two screw holes are symmetrically arranged on the fixing ring 11, and the two screw holes are threaded with vertical screws 10, and the lower ends of the two vertical screws 10 are connected to the forward and reverse motors 13 respectively after passing through the fixing plate, and the forward and reverse motors 13 are located outside the upper cylinder 2 and the lower cylinder 1. This arrangement allows the packing layer 12 to be located at the junction of the upper cylinder 2 and the lower cylinder 1 during spraying, and the gas introduced into the lower cylinder 1 passes through the packing layer 12 and fully contacts with the spray liquid before entering the upper cylinder 2 and being discharged. The spraying effect is improved, which is beneficial to improving the efficiency of gas processing. When the use time is too long or different fillers are required for different gases, the tower cover 3 is opened, and the packing layer 12 moves up to the top of the upper cylinder 2 when the forward and reverse motor 13 rotates, which is convenient for replacing the fillers in the packing layer 12.

[0022] The tower cover 3 is provided with a hanging ear 4 and an exhaust pipe 9, the bottom of the tower body is provided with an air inlet pipe 16 and a liquid outlet pipe 17, and the second spray pipe 15 is fixed with a cross reinforcement rod 19, and the reinforcement rod 19 is fixedly connected to the vertical pipe 14. The tower cover 3 can be removed by a hanging device, which is convenient for maintenance of the tower body. At the same time, the reinforcement rod 19 is provided to improve the stability of the second spray pipe 15 during the rotation spraying process.

[0023] During operation, the material after hydrolysis in the hydrolysis pot is directly sent to the flash evaporator through a high-temperature material pump, and is adiabatically evaporated, cooled, and concentrated in the flash evaporator. After cooling, the titanic acid passes through the liquid seal tank 1 (metatinic acid liquid seal tank) and then enters the cooling pot to serve as the raw material for the first washing process of titanium dioxide; the steam evaporated in the flash evaporator passes through the cyclone separator for the first gas-liquid separator, and the separated gas enters the air purification tower for cooling and then enters the spray tower for spraying to remove the acidic gas, and then enters the gas-liquid separator for gas-liquid separation again. The separated gas is extracted by a vacuum pump, and the separated liquid enters the liquid seal tank 2 (condensate liquid seal tank) and can be introduced into the air purification tower through a water pipe for reuse.

[0024] During the above process, observe whether the rising liquid level of the titanate liquid sealing tank is consistent with the feed flow of the flash evaporator. If not, there may be a pipeline leakage, which needs to be dealt with in time; observe whether the temperature difference between the cyclone separator and the flash evaporator is greater than 3°C. If it is greater than 3 degrees Celsius, there may be a pipeline breakage, which needs to be dealt with in time.

[0025] According to the viscosity of metatitanic acid, after a period of continuous operation (more than 20 days), stop the metatitanic acid feed pump of the flash evaporator and the vacuum pump connected to the gas-liquid separator in sequence, then open the waste acid inlet valve of the flash evaporator discharge pipeline to flush the pipe wall. If necessary, open the flash evaporator manhole to flush the inner wall. In addition, according to the acidity of the condensed water outlet in the gas purification tower, regularly replace the circulating spray water in the gas purification tower. The function of the gas purification tower is cooling, and the cooled liquid is discharged to other processes for purification and recovery.

[0026] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A metatitanic acid adiabatic evaporation device, comprising a flash evaporator, characterized in that: The liquid outlet of the flash evaporator is connected to the first liquid seal tank and the cooling pot in sequence, and the exhaust port of the flash evaporator is connected to the cyclone separator, the air purification tower, the spray tower, the gas-liquid separator and the second liquid seal tank in sequence, and the air purification tower is provided with a spray pipe 1; The second liquid seal tank is connected to the first spray pipe of the air purification tower through a water pipe; The spray tower includes a tower body and a tower cover. The tower cover is detachably connected to the tower body through a flange. A packing layer is provided in the tower body. A spray pipe 2 is provided above the packing layer. The spray pipe 2 is spiral-shaped. The lower surface of the spray pipe 2 is covered with spray holes. The center of the spray pipe 2 is fixedly connected with a vertical pipe. The upper end of the vertical pipe passes through the tower cover and is fixedly connected with a bevel gear 1. The bevel gear 1 is meshed with a bevel gear 2. The bevel gear 2 is connected to a stepper motor. The stepper motor is fixed on the tower cover. The vertical pipe outside the tower cover is connected to a water inlet pipe through a rotating joint.

2. The metatitanic acid adiabatic evaporation device according to claim 1, characterized in that: The tower body includes an upper cylinder and a lower cylinder with the same axis. The diameter of the upper cylinder is larger than that of the lower cylinder. A fixing ring is fixed on the outer edge of the packing layer. The outer ring diameter of the fixing ring is equal to the inner diameter of the upper cylinder. Two screw holes are symmetrically arranged on the fixing ring. Vertical screws are threadedly fitted in the two screw holes. The lower ends of the two vertical screws penetrate the upper cylinder and are respectively connected to forward and reverse motors.

3. The metatitanic acid adiabatic evaporation device according to claim 1, characterized in that: The tower cover is provided with a hanging ear and an exhaust pipe, the bottom of the tower body is provided with an air inlet pipe and a liquid outlet pipe, and the second spray pipe is fixed with a cross reinforcement rod, and the reinforcement rod is fixedly connected to the vertical pipe.

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