Automatic control system and automatic control method for hydrolysis process in production of titanium dioxide by sulfuric acid method

Abstract

The invention discloses an automatic control system for a hydrolysis process in sulfate process titanium dioxide production, and relates to the technical field of chemical engineering automation control. The device comprises a preheating pot gas distribution cylinder, a titaniferous solution preheating storage tank, a seed crystal titaniferous solution metering storage tank, a seed crystal preparation storage tank, a sodium hydroxide metering storage tank, a seed crystal process water metering storage tank and a hydrolysis tank, the preheating pot gas distribution cylinder is respectively connected with a titanium liquid preheating storage tank, a seed crystal titanium liquid metering storage tank, a seed crystal preparation storage tank and a hydrolysis tank; the sodium hydroxide metering storage tank and the seed crystal process water metering storage tank are both connected with the seed crystal preparation storage tank; the seed crystal titaniferous solution metering storage tank is connected with the seed crystal preparation storage tank; the seed crystal preparation storage tank is connected with the titanium liquid preheating storage tank; and the titaniferous solution preheating storage tank is connected with the hydrolysis tank. According to the invention, one-key start, full-automatic control and circulation of the hydrolysis process are realized. The invention also relates to an automatic control method of the automatic control system for the hydrolysis process in the production of the titanium dioxide by the sulfuric acid method.

Description

Technical Field

[0001] The present invention relates to the field of chemical automation control technology, more specifically, it is an automatic control system for the hydrolysis process of sulfuric acid titanium dioxide production. The present invention also relates to an automatic control method of the automatic control system for the hydrolysis process of sulfuric acid titanium dioxide production. Background Art

[0002] At present, the degree of automation in the production process of conventional hydrolysis process in the industry is low, and the control process is manual on-site and partially remote manual.

[0003] The following are the main problems in manual control of the hydrolysis process:

[0004] 1) There are quantitative requirements for the feed of hydrolysis alkali metering tank, process water metering tank, black titanium liquid metering tank, titanium liquid preheating pot, etc. If the valve is not closed or the pump is not stopped in time during manual operation, the feed amount will be inaccurate, affecting the quality of hydrolysis. If the valve is forgotten to be closed or the pump is stopped, it will cause leakage of hazardous chemicals and material loss, and even serious injuries to personnel.

[0005] 2) The hydrolysis station must have extremely precise control over pressure and temperature. When steam is used to heat up the black titanium liquid metering tank, seed preparation tank, titanium liquid preheating pot, hydrolysis tank, etc., the valve opening is manually controlled and cannot be adjusted in time, resulting in frequent fluctuations in the hydrolysis quality.

[0006] 3) Manual inspection and discharge of hydrolyzed materials may easily cause the storage tank to overflow after hydrolysis, resulting in material loss and personal injury.

[0007] 4) The operations of each shift are different, such as the opening speed of the heating valve, whether it is adjusted in time, the sampling and testing time, etc., which may cause large fluctuations in the hydrolysis quality.

[0008] Therefore, it is necessary to develop an automatic control system and an automatic control method for the hydrolysis process of sulfuric acid process titanium dioxide production. Summary of the invention

[0009] The first purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and provide an automatic control system for the hydrolysis process of sulfuric acid process titanium dioxide production.

[0010] The second object of the present invention is to provide an automatic control method for the automatic control system of the hydrolysis process in the production of titanium dioxide by the sulfuric acid process.

[0011] In order to achieve the above first purpose, the technical scheme of the present invention is: an automatic control system for the hydrolysis process of sulfuric acid titanium dioxide production, characterized in that it includes a preheating pot cylinder, a titanium liquid preheating storage tank, a seed titanium liquid metering storage tank, a seed preparation storage tank, a sodium hydroxide metering storage tank, a seed process water metering storage tank, and a hydrolysis tank;

[0012] The preheating pot cylinders are respectively connected to the titanium liquid preheating tank, the seed titanium liquid metering tank, the seed crystal preparation tank and the hydrolysis tank; the sodium hydroxide metering tank and the seed crystal process water metering tank are both connected to the seed crystal preparation tank; the seed titanium liquid metering tank is connected to the seed crystal preparation tank;

[0013] The seed preparation tank is connected to the titanium liquid preheating tank; the titanium liquid preheating tank is connected to the hydrolysis tank;

[0014] The preheating pot cylinder is connected to steam, the titanium liquid preheating storage tank and the crystal seed titanium liquid metering storage tank are connected to the material port, the sodium hydroxide metering storage tank is connected to liquid alkali, and the crystal seed process water metering storage tank is connected to process water.

[0015] In the above technical scheme, a preheating pot agitator is arranged in the titanium liquid preheating tank, a seed titanium liquid metering tank agitator is arranged in the seed titanium liquid metering tank, a seed crystal preparation tank agitator is arranged in the seed crystal preparation tank, and a hydrolysis pot agitator is arranged in the hydrolysis tank.

[0016] In the above technical scheme, the titanium liquid preheating storage tank is provided with a preheating pot thermometer, the seed titanium liquid metering storage tank is provided with a seed titanium liquid metering tank thermometer, the seed crystal preparation storage tank is provided with a seed crystal preparation tank thermometer, and the hydrolysis tank is provided with a hydrolysis pot thermometer and a hydrolysis pot differential pressure gauge.

[0017] In the above technical solution, the sodium hydroxide metering storage tank is connected to the small sodium hydroxide metering tank, the seed crystal process water metering storage tank is connected to the small seed crystal process water metering tank, and the small sodium hydroxide metering tank and the small seed crystal process water metering tank are both connected to the seed crystal preparation tank.

[0018] In the above technical scheme, the preheating pot cylinder is connected to the titanium liquid preheating tank through the preheating pot steam valve, connected to the seed titanium liquid metering tank through the seed titanium liquid metering tank steam valve, connected to the seed crystal preparation tank through the seed crystal preparation tank steam valve, connected to the hydrolysis tank through the first hydrolysis pot steam valve, and connected to the hydrolysis tank through the second hydrolysis pot steam valve; the first hydrolysis pot steam valve and the second hydrolysis pot steam valve are connected in parallel.

[0019] In the above technical solution, the sodium hydroxide metering storage tank is connected to the small sodium hydroxide metering tank through the sodium hydroxide metering storage tank valve, and the small sodium hydroxide metering tank is connected to the seed crystal preparation storage tank through the small sodium hydroxide metering tank valve; the seed crystal process water metering storage tank is connected to the small seed crystal process water metering tank through the seed crystal process water metering storage tank valve, and the small seed crystal process water metering tank is connected to the seed crystal preparation storage tank through the small seed crystal process water metering tank valve;

[0020] The crystal seed titanium liquid metering storage tank is connected to the crystal seed preparation storage tank through the crystal seed titanium liquid metering storage tank discharge monitoring electrode and the crystal seed titanium liquid metering tank bottom valve in sequence;

[0021] The seed preparation storage tank is connected to the titanium liquid preheating storage tank in sequence through the seed preparation discharge bottom valve, the preheating pot with seed electrode, and the preheating pot with seed valve;

[0022] The titanium liquid preheating storage tank is connected to the hydrolysis tank through the preheating pot discharge bottom valve and the hydrolysis pot feed valve in sequence;

[0023] The hydrolysis tank is connected with the post-hydrolysis storage tank through the hydrolysis pot discharge bottom valve.

[0024] In the above technical solution, the hydrolysis tank is connected to the first hydrolysis pot washing motor through the first hydrolysis pot washing valve and to the second hydrolysis pot washing motor through the second hydrolysis pot washing valve. The first hydrolysis pot washing valve and the first hydrolysis pot washing motor are connected in parallel with the second hydrolysis pot washing valve and the second hydrolysis pot washing motor. The first hydrolysis pot washing motor and the second hydrolysis pot washing motor are connected to process water.

[0025] In the above technical scheme, the seed preparation tank is connected to the ditch through the seed preparation tank drain valve, the hydrolysis tank is connected to the hydrolysis exhaust gas fan through the hydrolysis pot chimney valve, and the titanium liquid preheating tank and the seed titanium liquid metering tank are connected to the steam condensate outlet.

[0026] In the above technical solution, the small sodium hydroxide metering tank is provided with a small sodium hydroxide metering tank level gauge, and the small seed process water metering tank is provided with a small seed process water metering tank level gauge.

[0027] In order to achieve the above second purpose, the technical solution of the present invention is: an automatic control method of an automatic control system of a hydrolysis process of sulfuric acid process titanium dioxide production, characterized in that it comprises the following steps:

[0028] Step 1: Start the hydrolysis program. Press the program start button. The DCS system automatically detects the conditions before starting and sets the equipment to the initial state.

[0029] Step 2, turn on the preheating pot agitator and open the preheating pot steam valve to 100%;

[0030] Step 3, the preheating pot thermometer detects that the temperature in the titanium liquid preheating tank reaches the set value;

[0031] Step 4, the preheating pot thermometer detects that the temperature in the titanium liquid preheating tank reaches the set value, and the preheating pot steam valve is closed;

[0032] Step 5, after the agitator of the seed titanium liquid metering tank is turned on for 5S;

[0033] The valve of the sodium hydroxide metering storage tank is open, the liquid level gauge of the sodium hydroxide small metering tank detects that the liquid level of the sodium hydroxide small metering tank reaches the set value, and the valve of the sodium hydroxide metering storage tank is closed; the valve of the sodium hydroxide small metering tank is open, the time reaches the set value, and the valve of the sodium hydroxide small metering tank is closed;

[0034] The crystal seed process water metering storage tank valve is opened, the crystal seed process water small metering tank liquid level gauge detects that the crystal seed process water small metering tank liquid level reaches the set value, and the crystal seed process water metering storage tank valve is closed; the crystal seed process water small metering tank valve is opened, the time reaches the set value, and the crystal seed process water small metering tank valve is closed;

[0035] Step 6, after the agitator of the seed crystal preparation tank is turned on for 5 seconds, the steam valve of the seed crystal titanium liquid metering tank is opened to the set opening;

[0036] Step 7, the temperature in the seed crystal titanium liquid metering tank is detected by the thermometer of the seed crystal preparation tank to reach the set value, and the steam valve of the seed crystal titanium liquid metering tank is closed;

[0037] Step 8: After the steam valve of the seed titanium liquid metering tank is closed for 5 seconds, the steam valve of the seed preparation storage tank is opened to the set opening;

[0038] Step 9, the temperature in the seed crystal preparation tank is detected by the thermometer of the seed crystal preparation tank to reach the set value;

[0039] Step 10, when the bottom valve opening of the seed titanium liquid metering tank reaches the set opening, the timing starts and reaches the set time;

[0040] Step 11, the bottom valve of the seed titanium liquid metering tank is opened to 100%;

[0041] Step 12, the discharge monitoring electrode of the seed titanium liquid metering storage tank is disconnected and reaches the set time value;

[0042] Step 13, the temperature in the seed preparation tank is detected by the thermometer of the seed preparation tank to reach the set value, and the steam valve of the seed preparation tank is closed;

[0043] Step 14, after the steam valve of the seed crystal preparation storage tank is closed for 5 seconds, the bottom valve of the seed crystal titanium liquid metering tank is closed;

[0044] Step 15, after the bottom valve of the seed titanium liquid metering tank is closed for 5 seconds, the agitator of the seed titanium liquid metering tank is stopped;

[0045] Step 16, manually measure stability, click Confirm;

[0046] Step 17, the seed preparation discharge bottom valve is opened, and the preheating pot seed adding valve is opened;

[0047] Step 18, the opening time of the bottom valve for seed preparation reaches the set value, the electrode for adding seed to the preheating pot is disconnected, and the valve for adding seed to the preheating pot is closed;

[0048] Step 19, after the preheating pot seeding valve is closed for 5 seconds, the agitator of the seed preparation tank is stopped;

[0049] Step 20, after the agitator of the seed preparation tank is stopped for 5 seconds, the drain valve of the seed preparation tank is opened;

[0050] Step 21, the seed preparation tank drain valve opening time reaches the set value, the seed preparation discharge bottom valve is closed, the seed preparation tank drain valve is closed, the hydrolysis pot chimney valve is opened, and the hydrolysis pot discharge bottom valve is closed;

[0051] Step 22, the feed valve of the hydrolysis pot is opened;

[0052] Step 23, after the feed valve of the hydrolysis pot is opened for 5 seconds, the bottom valve of the preheating pot is opened and the timing starts;

[0053] Step 24, the opening time of the bottom valve of the preheating pot reaches the set value, the agitator of the hydrolysis pot is turned on, and the steam valve of the first hydrolysis pot is opened to the set value;

[0054] Step 25, the steam valve of the first hydrolysis pot is opened to a set value and maintained for a set time;

[0055] Step 26, preheat the pot and stop the stirrer.

[0056] Step 27, the agitator stop time of the preheating pot reaches the set value; the steam valve of the first hydrolysis pot is opened to the set value; the bottom valve of the preheating pot is closed, and the feed valve of the hydrolysis pot is closed;

[0057] Step 28, the hydrolysis pot thermometer detects that the temperature in the hydrolysis tank reaches a set value, and the hydrolysis pot differential pressure gauge detects that the pressure difference in the hydrolysis tank reaches a set value, and starts timing until the timing reaches the set value;

[0058] Step 29, the steam valve of the first hydrolysis pot is closed;

[0059] Step 30, the steam valve of the first hydrolysis pot is closed and the timing starts, and reaches the set time;

[0060] Step 31, the steam valve of the first hydrolysis pot is opened to a set value;

[0061] Step 32, the hydrolysis pot differential pressure gauge detects that the pressure difference in the hydrolysis tank reaches a specific value; the steam valve of the first hydrolysis pot is closed;

[0062] Step 33, after the steam valve of the first hydrolysis pot is closed for 5 seconds, the chimney valve of the hydrolysis pot is closed;

[0063] Step 34, after the chimney valve of the hydrolysis pot is closed, the steam valve of the second hydrolysis pot is opened, and the timing is started. After the set time is reached, the steam valve of the second hydrolysis pot is closed;

[0064] Step 35, after the steam valve of the second hydrolysis pot is closed for 5 seconds, the chimney valve of the hydrolysis pot is opened;

[0065] Step 36, detecting that the liquid level of the storage tank after hydrolysis is lower than the liquid level setting value; the bottom valve of the hydrolysis pot is opened;

[0066] Step 37, manually judge that the material discharge is completed, and click to end the material discharge;

[0067] Step 38, the first hydrolysis pot washing valve, the first hydrolysis pot washing motor, the second hydrolysis pot washing valve, and the second hydrolysis pot washing motor are turned on to the set time;

[0068] Step 39, the first hydrolysis pot washing valve, the first hydrolysis pot washing motor, the second hydrolysis pot washing valve, and the second hydrolysis pot washing motor are turned off;

[0069] Step 40, the DCS system automatically detects the start conditions and automatically repeats the steps to achieve automatic control.

[0070] Compared with the prior art, the present invention has the following advantages:

[0071] 1) The present invention realizes one-key start, full-automatic control and circulation process of the hydrolysis process.

[0072] 2) The present invention can timely and stably adjust the temperature of the titanium liquid preheating tank, the hydrolysis tank, and the seed crystal preparation tank, thereby avoiding imbalance in production stability caused by parameter imbalance.

[0073] 3) The present invention can make timely and stable adjustments in the hydrolysis tank, avoiding imbalance in production stability caused by parameter imbalance.

[0074] 4) The present invention can reduce errors during manual operation.

[0075] 5) The present invention can accurately control the time of each process.

[0076] 6) The present invention is easy to operate, has a high degree of automation, a high safety factor, and good stability, and truly realizes automated control of the process, which not only reduces labor intensity but also reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] Figure 1 It is a structural schematic diagram of the present invention.

[0078] Among them, A-material port, B-steam condensate outlet, 100-preheating pot cylinder, 110-preheating pot steam valve, 120-seed titanium liquid metering tank steam valve, 130-seed preparation tank steam valve, 141-first hydrolysis pot steam valve, 142-second hydrolysis pot steam valve, 210-titanium liquid preheating tank, 211-preheating pot agitator, 212-preheating pot thermometer, 213-preheating pot plus seed electrode, 214-preheating pot plus Seed valve, 215-preheating pot discharge bottom valve, 220-seed titanium liquid metering storage tank, 221-seed titanium liquid metering tank agitator, 222-seed titanium liquid metering tank thermometer, 223-seed titanium liquid metering storage tank discharge monitoring electrode, 224-seed titanium liquid metering tank bottom valve, 230-seed preparation tank, 231-seed preparation tank agitator, 232-seed preparation tank thermometer, 233-seed preparation discharge bottom valve, 234-seed preparation tank Drain valve, 310-sodium hydroxide metering tank, 311-sodium hydroxide metering tank valve, 320-seed process water metering tank, 321-seed process water metering tank valve, 330-sodium hydroxide small metering tank, 331-sodium hydroxide small metering tank valve, 332-sodium hydroxide small metering tank level gauge, 340-seed process water small metering tank, 341-seed process water small metering tank valve, 342-seed process water small metering tank level gauge, 400 -hydrolysis tank, 410-hydrolysis pot agitator, 421-hydrolysis pot thermometer, 422-hydrolysis pot differential pressure gauge, 430-hydrolysis pot discharge bottom valve, 441-first hydrolysis pot washing valve, 442-second hydrolysis pot washing valve, 451-first hydrolysis pot washing motor, 452-second hydrolysis pot washing motor, 460-hydrolysis pot chimney valve, 470-hydrolysis pot feed valve, 510-post-hydrolysis storage tank, 520-ditch, 530-hydrolysis tail gas fan. DETAILED DESCRIPTION

[0079] The following detailed description of the implementation of the present invention is made in conjunction with the accompanying drawings, but they do not constitute a limitation of the present invention and are only given as examples. At the same time, the advantages of the present invention will become clearer and easier to understand through the description.

[0080] Referring to the attached drawings, it can be seen that the automatic control system of the hydrolysis process of sulfuric acid process titanium dioxide production is characterized by comprising a preheating pot cylinder 100, a titanium liquid preheating storage tank 210, a seed titanium liquid metering storage tank 220, a seed preparation storage tank 230, a sodium hydroxide metering storage tank 310, a seed process water metering storage tank 320, and a hydrolysis tank 400;

[0081] The preheating pot cylinder 100 is respectively connected to the titanium liquid preheating tank 210, the seed titanium liquid metering tank 220, the seed crystal preparation tank 230 and the hydrolysis tank 400; the sodium hydroxide metering tank 310 and the seed crystal process water metering tank 320 are both connected to the seed crystal preparation tank 230; the seed titanium liquid metering tank 220 is connected to the seed crystal preparation tank 230;

[0082] The seed preparation tank 230 is connected to the titanium liquid preheating tank 210; the titanium liquid preheating tank 210 is connected to the hydrolysis tank 400;

[0083] The preheating pot cylinder 100 is connected to steam, the titanium liquid preheating storage tank 210 and the seed titanium liquid metering storage tank 220 are connected to the material port A, the sodium hydroxide metering storage tank 310 is connected to liquid alkali, and the seed process water metering storage tank 320 is connected to process water.

[0084] A preheating pot agitator 211 is provided in the titanium liquid preheating tank 210 , a seed titanium liquid metering tank agitator 221 is provided in the seed titanium liquid metering tank 220 , a seed crystal preparation tank agitator 231 is provided in the seed crystal preparation tank 230 , and a hydrolysis pot agitator 410 is provided in the hydrolysis tank 400 .

[0085] The titanium liquid preheating storage tank 210 is provided with a preheating pot thermometer 212 , the seed titanium liquid metering storage tank 220 is provided with a seed titanium liquid metering tank thermometer 222 , the seed crystal preparation storage tank 230 is provided with a seed crystal preparation tank thermometer 232 , and the hydrolysis tank 400 is provided with a hydrolysis pot thermometer 421 and a hydrolysis pot differential pressure gauge 422 .

[0086] The sodium hydroxide metering storage tank 310 is connected to the small sodium hydroxide metering tank 330 , the seed crystal process water metering storage tank 320 is connected to the small seed crystal process water metering tank 340 , and both the small sodium hydroxide metering tank 330 and the small seed crystal process water metering tank 340 are connected to the seed crystal preparation storage tank 230 .

[0087] The preheating pot cylinder 100 is connected to the titanium liquid preheating tank 210 through the preheating pot steam valve 110, is connected to the seed titanium liquid metering tank 220 through the seed titanium liquid metering tank steam valve 120, is connected to the seed crystal preparation tank 230 through the seed crystal preparation tank steam valve 130, is connected to the hydrolysis tank 400 through the first hydrolysis pot steam valve 141, and is connected to the hydrolysis tank 400 through the second hydrolysis pot steam valve 142; the first hydrolysis pot steam valve 141 and the second hydrolysis pot steam valve 142 are connected in parallel.

[0088] The sodium hydroxide metering storage tank 310 is connected to the sodium hydroxide small metering tank 330 through the sodium hydroxide metering storage tank valve 311, and the sodium hydroxide small metering tank 330 is connected to the seed preparation storage tank 230 through the sodium hydroxide small metering tank valve 331; the seed process water metering storage tank 320 is connected to the seed process water small metering tank 340 through the seed process water metering storage tank valve 321, and the seed process water small metering tank 340 is connected to the seed preparation storage tank 230 through the seed process water small metering tank valve 341;

[0089] The crystal seed titanium liquid metering storage tank 220 is connected to the crystal seed preparation storage tank 230 through the crystal seed titanium liquid metering storage tank discharge monitoring electrode 223 and the crystal seed titanium liquid metering tank bottom valve 224 in sequence;

[0090] The seed preparation tank 230 is connected to the titanium liquid preheating tank 210 through the seed preparation discharge bottom valve 233, the preheating pot with seed electrode 213, and the preheating pot with seed valve 214 in sequence;

[0091] The titanium liquid preheating storage tank 210 is connected to the hydrolysis tank 400 through the preheating pot discharge bottom valve 215 and the hydrolysis pot feed valve 470 in sequence;

[0092] The hydrolysis tank 400 is connected to the post-hydrolysis storage tank 510 via the hydrolysis pot discharge bottom valve 430 .

[0093] The hydrolysis tank 400 is connected to the first hydrolysis pot washing motor 451 through the first hydrolysis pot washing valve 441 and to the second hydrolysis pot washing motor 452 through the second hydrolysis pot washing valve 442. The first hydrolysis pot washing valve 441 and the first hydrolysis pot washing motor 451 are connected in parallel with the second hydrolysis pot washing valve 442 and the second hydrolysis pot washing motor 452. The first hydrolysis pot washing motor 451 and the second hydrolysis pot washing motor 452 are connected to process water.

[0094] The seed preparation tank 230 is connected to the ditch 520 via the seed preparation tank drain valve 234, the hydrolysis tank 400 is connected to the hydrolysis tail gas fan 530 via the hydrolysis pot chimney valve 460, and the titanium liquid preheating tank 210 and the seed titanium liquid metering tank 220 are connected to the steam condensate discharge port B.

[0095] The small sodium hydroxide metering tank 330 is provided with a small sodium hydroxide metering tank level gauge 332 , and the small seed process water metering tank 340 is provided with a small seed process water metering tank level gauge 342 .

[0096] The automatic control method of the automatic control system of the hydrolysis process of sulfuric acid process titanium dioxide production is characterized by comprising the following steps:

[0097] Step 1: Start the hydrolysis program. Press the program start button. The DCS system automatically detects the conditions before starting and sets the equipment to the initial state.

[0098] Step 2, the preheating pot agitator 211 is turned on, and the preheating pot steam valve 110 is opened to 100%;

[0099] Step 3, the preheating pot thermometer 212 detects that the temperature in the titanium liquid preheating tank 210 reaches the set value, and the preheating pot steam valve 110 is closed;

[0100] Step 4, after the agitator 221 of the seed titanium liquid metering tank is turned on for 5 seconds;

[0101] The sodium hydroxide metering tank valve 311 is opened, the sodium hydroxide small metering tank liquid level gauge 332 detects that the liquid level of the sodium hydroxide small metering tank 330 reaches the set value, and the sodium hydroxide metering tank valve 311 is closed; the sodium hydroxide small metering tank valve 331 is opened, the time reaches the set value, and the sodium hydroxide small metering tank valve 331 is closed;

[0102] The crystal seed process water metering storage tank valve 321 is opened, the crystal seed process water small metering tank liquid level gauge 342 detects that the liquid level of the crystal seed process water small metering tank 340 has reached the set value, and the crystal seed process water metering storage tank valve 321 is closed; the crystal seed process water small metering tank valve 341 is opened, the time reaches the set value, and the crystal seed process water small metering tank valve 341 is closed;

[0103] Step 5, after the agitator 231 of the seed crystal preparation tank is turned on for 5 seconds, the steam valve 120 of the seed crystal titanium liquid metering tank is opened to the set opening;

[0104] Step 6, the temperature meter 222 of the seed titanium liquid metering tank detects that the temperature in the seed crystal preparation storage tank 230 reaches the set value, and the steam valve 120 of the seed titanium liquid metering tank is closed;

[0105] Step 7, after the steam valve 120 of the seed titanium liquid metering tank is closed for 5 seconds, the steam valve 130 of the seed crystal preparation storage tank is opened to the set opening;

[0106] Step 8, the seed crystal preparation tank thermometer 232 detects that the temperature in the seed crystal preparation tank 230 reaches the set value;

[0107] Step 9, the opening of the bottom valve 224 of the seed titanium liquid metering tank reaches the set opening, and the timing starts and reaches the set time;

[0108] Step 10, the bottom valve 224 of the seed titanium liquid metering tank is opened to 100%;

[0109] Step 11, the discharge monitoring electrode 223 of the seed titanium liquid metering storage tank is disconnected and reaches the set time value;

[0110] Step 12, the seed crystal preparation tank thermometer 232 detects that the temperature in the seed crystal preparation tank 230 reaches the set value, and the seed crystal preparation tank steam valve 130 is closed;

[0111] Step 13, after the steam valve 130 of the seed crystal preparation tank is closed for 5 seconds, the bottom valve 224 of the seed crystal titanium liquid metering tank is closed;

[0112] Step 14, after the bottom valve 224 of the seed titanium liquid metering tank is closed for 5 seconds, the agitator 221 of the seed titanium liquid metering tank is stopped;

[0113] Step 15, manually measure stability, click Confirm;

[0114] Step 16, the seed preparation discharge bottom valve 233 is opened, and the preheating pot seed adding valve 214 is opened;

[0115] Step 17, the opening time of the seed preparation discharge bottom valve 233 reaches the set value, the preheating pot adding seed electrode 213 is disconnected, and the preheating pot adding seed valve 214 is closed;

[0116] Step 18, after the preheating pot seeding valve 214 is closed for 5 seconds, the seed preparation tank agitator 231 is stopped;

[0117] Step 19, after the agitator 231 of the seed preparation tank is stopped for 5 seconds, the drain valve 234 of the seed preparation tank is opened;

[0118] Step 20, the opening time of the drain valve 234 of the seed preparation tank reaches the set value, the seed preparation discharge bottom valve 233 is closed, the drain valve 234 of the seed preparation tank is closed, the chimney valve 460 of the hydrolysis pot is opened, and the bottom valve 430 of the hydrolysis pot is closed;

[0119] Step 21, the hydrolysis pot feed valve 470 is opened;

[0120] Step 22, after the hydrolysis pot feed valve 470 is opened for 5 seconds, the preheating pot discharge bottom valve 215 is opened and the timing starts;

[0121] Step 23, the opening time of the preheating pot discharge bottom valve 215 reaches the set value, the hydrolysis pot agitator 410 is turned on, and the first hydrolysis pot steam valve 141 is opened to the set value;

[0122] Step 24, the steam valve 141 of the first hydrolysis pot is opened to a set value and maintained for a set time;

[0123] Step 25, the preheating pot stirrer 211 is stopped,

[0124] Step 26, the stop time of the preheating pot agitator 211 reaches the set value; the steam valve 141 of the first hydrolysis pot is opened to the set value; the preheating pot discharge bottom valve 215 is closed, and the hydrolysis pot feed valve 470 is closed;

[0125] Step 27, the hydrolysis pot thermometer 421 detects that the temperature in the hydrolysis tank 400 reaches the set value, and the hydrolysis pot differential pressure gauge 422 detects that the pressure difference in the hydrolysis tank 400 reaches the set value, and starts timing, and the timing reaches the set value;

[0126] Step 28, the steam valve 141 of the first hydrolysis pot is closed;

[0127] Step 29, the first hydrolysis pot steam valve 141 is fully closed and the timing starts, and reaches the set time;

[0128] Step 30, the steam valve 141 of the first hydrolysis pot is opened to a set value;

[0129] Step 31, the hydrolysis pot differential pressure gauge 422 detects that the pressure difference in the hydrolysis tank 400 reaches a specific value; the first hydrolysis pot steam valve 141 is closed;

[0130] Step 32, after the first hydrolysis pot steam valve 141 is closed for 5 seconds, the hydrolysis pot chimney valve 460 is closed;

[0131] Step 33, after the chimney valve 460 of the hydrolysis pot is closed, the steam valve 142 of the second hydrolysis pot is opened and the timing is started. After the set time is reached, the steam valve 142 of the second hydrolysis pot is closed;

[0132] Step 34, after the second hydrolysis pot steam valve 142 is closed for 5 seconds, the hydrolysis pot chimney valve 460 is opened;

[0133] Step 35, detecting that the liquid level of the storage tank 510 after hydrolysis is lower than the liquid level setting value; the bottom valve 430 of the hydrolysis pot is opened;

[0134] Step 36, manually judge that the material discharge is completed, and click to end the material discharge;

[0135] Step 37, the first hydrolysis pot washing valve 441, the first hydrolysis pot washing motor 451, the second hydrolysis pot washing valve 442, and the second hydrolysis pot washing motor 452 are turned on to the set time;

[0136] Step 38, the first hydrolysis pot washing valve 441, the first hydrolysis pot washing motor 451, the second hydrolysis pot washing valve 442, and the second hydrolysis pot washing motor 452 are closed;

[0137] Step 39: The DCS system automatically detects the start-up conditions and automatically repeats steps 1-39 to achieve automatic control.

[0138] In actual use, the titanium liquid preheating storage tank 210 is connected to the hydrolysis tail gas blower 530 .

[0139] Other parts not described belong to the prior art.

Claims

1. The automatic control system for the hydrolysis process of sulfuric acid process titanium dioxide production is characterized by: It comprises a preheating pot cylinder (100), a titanium liquid preheating storage tank (210), a crystal seed titanium liquid metering storage tank (220), a crystal seed preparation storage tank (230), a sodium hydroxide metering storage tank (310), a crystal seed process water metering storage tank (320), and a hydrolysis tank (400); The preheating pot cylinder (100) is respectively connected to the titanium liquid preheating storage tank (210), the seed titanium liquid metering storage tank (220), the seed crystal preparation storage tank (230) and the hydrolysis tank (400); the sodium hydroxide metering storage tank (310) and the seed crystal process water metering storage tank (320) are both connected to the seed crystal preparation storage tank (230); the seed titanium liquid metering storage tank (220) is connected to the seed crystal preparation storage tank (230); The seed crystal preparation storage tank (230) is connected to the titanium liquid preheating storage tank (210); the titanium liquid preheating storage tank (210) is connected to the hydrolysis tank (400); The preheating pot cylinder (100) is connected to steam, the titanium liquid preheating storage tank (210) and the seed titanium liquid metering storage tank (220) are connected to the material port (A), the sodium hydroxide metering storage tank (310) is connected to liquid alkali, and the seed process water metering storage tank (320) is connected to process water.

2. The automatic control system for the hydrolysis process of sulfuric acid process titanium dioxide production according to claim 1, characterized in that: A preheating pot agitator (211) is arranged in the titanium liquid preheating tank (210), a seed titanium liquid metering tank agitator (221) is arranged in the seed titanium liquid metering tank (220), a seed crystal preparation tank agitator (231) is arranged in the seed crystal preparation tank (230), and a hydrolysis pot agitator (410) is arranged in the hydrolysis tank (400).

3. The automatic control system for the hydrolysis process of sulfuric acid process titanium dioxide production according to claim 2, characterized in that: The titanium liquid preheating storage tank (210) is provided with a preheating pot thermometer (212), the seed titanium liquid metering storage tank (220) is provided with a seed titanium liquid metering tank thermometer (222), the seed crystal preparation storage tank (230) is provided with a seed crystal preparation tank thermometer (232), and the hydrolysis tank (400) is provided with a hydrolysis pot thermometer (421) and a hydrolysis pot differential pressure gauge (422).

4. The automatic control system for the hydrolysis process of sulfuric acid process titanium dioxide production according to claim 3, characterized in that: The sodium hydroxide metering storage tank (310) is connected to the sodium hydroxide small metering tank (330), the seed crystal process water metering storage tank (320) is connected to the seed crystal process water small metering tank (340), and the sodium hydroxide small metering tank (330) and the seed crystal process water small metering tank (340) are both connected to the seed crystal preparation storage tank (230).

5. The automatic control system for the hydrolysis process of sulfuric acid process titanium dioxide production according to claim 4, characterized in that: The preheating pot sub-cylinder (100) is connected to the titanium liquid preheating storage tank (210) through the preheating pot steam valve (110), connected to the titanium liquid seed metering storage tank (220) through the titanium liquid seed metering tank steam valve (120), connected to the titanium liquid seed preparation storage tank (230) through the titanium liquid seed preparation tank steam valve (130), connected to the hydrolysis tank (400) through the first hydrolysis pot steam valve (141), and connected to the hydrolysis tank (400) through the second hydrolysis pot steam valve (142); the first hydrolysis pot steam valve (141) and the second hydrolysis pot steam valve (142) are connected in parallel.

6. The automatic control system for the hydrolysis process of sulfuric acid process titanium dioxide production according to claim 5, characterized in that: The sodium hydroxide metering storage tank (310) is connected to the sodium hydroxide small metering tank (330) via a sodium hydroxide metering storage tank valve (311), and the sodium hydroxide small metering tank (330) is connected to the seed crystal preparation storage tank (230) via a sodium hydroxide small metering tank valve (331); the seed crystal process water metering storage tank (320) is connected to the seed crystal process water small metering tank (340) via a seed crystal process water metering storage tank valve (321), and the seed crystal process water small metering tank (340) is connected to the seed crystal preparation storage tank (230) via a seed crystal process water small metering tank valve (341); The seed titanium liquid metering storage tank (220) is connected to the seed crystal preparation storage tank (230) in sequence through the seed titanium liquid metering storage tank discharge monitoring electrode (223) and the seed titanium liquid metering tank bottom valve (224); The seed preparation storage tank (230) is connected to the titanium liquid preheating storage tank (210) in sequence through the seed preparation discharge bottom valve (233), the preheating pot with seed electrode (213), and the preheating pot with seed valve (214); The titanium liquid preheating storage tank (210) is connected to the hydrolysis tank (400) via the preheating pot discharge bottom valve (215) and the hydrolysis pot feed valve (470) in sequence; The hydrolysis tank (400) is connected to the post-hydrolysis storage tank (510) via a hydrolysis pot discharge bottom valve (430).

7. The automatic control system for the hydrolysis process of sulfuric acid process titanium dioxide production according to claim 6, characterized in that: The hydrolysis tank (400) is connected to a first hydrolysis tank washing motor (451) via a first hydrolysis tank washing valve (441), and is connected to a second hydrolysis tank washing motor (452) via a second hydrolysis tank washing valve (442); the first hydrolysis tank washing valve (441) and the first hydrolysis tank washing motor (451) are connected in parallel with the second hydrolysis tank washing valve (442) and the second hydrolysis tank washing motor (452); the first hydrolysis tank washing motor (451) and the second hydrolysis tank washing motor (452) are connected to process water.

8. The automatic control system for the hydrolysis process of sulfuric acid process titanium dioxide production according to claim 7, characterized in that: The seed crystal preparation tank (230) is connected to the ditch (520) via the seed crystal preparation tank drain valve (234), the hydrolysis tank (400) is connected to the hydrolysis tail gas fan (530) via the hydrolysis pot chimney valve (460), and the titanium liquid preheating tank (210) and the seed crystal titanium liquid metering tank (220) are connected to the steam condensate discharge port (B).

9. The automatic control system for the hydrolysis process of sulfuric acid process titanium dioxide production according to claim 8, characterized in that: The sodium hydroxide small metering tank (330) is provided with a sodium hydroxide small metering tank liquid level meter (332), and the seed crystal process water small metering tank (340) is provided with a seed crystal process water small metering tank liquid level meter (342).

10. The automatic control method of the automatic control system of the hydrolysis process of sulfuric acid process titanium dioxide production according to claim 9, characterized in that: The following steps are involved: Step 1: Start the hydrolysis program. Press the program start button. The DCS system automatically detects the conditions before starting and sets the equipment to the initial state. Step 2, the preheating pot agitator (211) is turned on, and the preheating pot steam valve (110) is opened to 100%; Step 3, the preheating pot thermometer (212) detects that the temperature in the titanium liquid preheating tank (210) reaches the set value, and the preheating pot steam valve (110) is closed; Step 4, after the agitator (221) of the seed titanium liquid metering tank is turned on for 5 seconds; The sodium hydroxide metering tank valve (311) is opened, the sodium hydroxide small metering tank liquid level meter (332) detects that the liquid level of the sodium hydroxide small metering tank (330) reaches a set value, and the sodium hydroxide metering tank valve (311) is closed; the sodium hydroxide small metering tank valve (331) is opened, the time reaches a set value, and the sodium hydroxide small metering tank valve (331) is closed; The crystal seed process water metering storage tank valve (321) is opened, the crystal seed process water small metering tank liquid level gauge (342) detects that the liquid level of the crystal seed process water small metering tank (340) reaches the set value, and the crystal seed process water metering storage tank valve (321) is closed; the crystal seed process water small metering tank valve (341) is opened, the time reaches the set value, and the crystal seed process water small metering tank valve (341) is closed; Step 5, after the agitator (231) of the seed crystal preparation tank is turned on for 5 seconds, the steam valve (120) of the seed crystal titanium liquid metering tank is opened to a set opening; Step 6, the seed titanium liquid metering tank thermometer (222) detects that the temperature in the seed crystal preparation storage tank (230) reaches the set value, and the seed titanium liquid metering tank steam valve (120) is closed; Step 7, after the steam valve (120) of the seed titanium liquid metering tank is closed for 5 seconds, the steam valve (130) of the seed crystal preparation storage tank is opened to a set opening; Step 8, the seed crystal preparation tank thermometer (232) detects that the temperature in the seed crystal preparation tank (230) reaches the set value; Step 9, when the opening of the bottom valve (224) of the seed titanium liquid metering tank reaches the set opening, the timing starts and reaches the set time; Step 10, the bottom valve (224) of the seed titanium liquid metering tank is opened to 100%; Step 11, the discharge monitoring electrode (223) of the seed titanium liquid metering storage tank is disconnected and reaches the set time value; Step 12, the seed crystal preparation tank thermometer (232) detects that the temperature in the seed crystal preparation tank (230) reaches the set value, and the seed crystal preparation tank steam valve (130) is closed; Step 13, after the steam valve (130) of the seed crystal preparation storage tank is closed for 5 seconds, the bottom valve (224) of the seed crystal titanium liquid metering tank is closed; Step 14, after the bottom valve (224) of the seed titanium liquid metering tank is closed for 5 seconds, the agitator (221) of the seed titanium liquid metering tank is stopped; Step 15, manually measure stability and click Confirm; Step 16, the seed preparation discharge bottom valve (233) is opened, and the preheating pot seed adding valve (214) is opened; Step 17, the opening time of the seed preparation discharge bottom valve (233) reaches the set value, the preheating pot adding seed electrode (213) is disconnected, and the preheating pot adding seed valve (214) is closed; Step 18, after the preheating pot seeding valve (214) is closed for 5 seconds, the seed preparation tank agitator (231) is stopped; Step 19, after the agitator (231) of the seed preparation tank is stopped for 5 seconds, the drain valve (234) of the seed preparation tank is opened; Step 20, the opening time of the drain valve (234) of the seed crystal preparation tank reaches the set value, the seed crystal preparation discharge bottom valve (233) is closed, the drain valve (234) of the seed crystal preparation tank is closed, the chimney valve (460) of the hydrolysis pot is opened, and the discharge bottom valve (430) of the hydrolysis pot is closed; Step 21, the hydrolysis pot feed valve (470) is opened; Step 22, after the hydrolysis pot feed valve (470) is opened for 5 seconds, the preheating pot discharge bottom valve (215) is opened and the timing starts; Step 23, the opening time of the preheating pot discharge bottom valve (215) reaches the set value, the hydrolysis pot stirrer (410) is turned on, and at the same time, the first hydrolysis pot steam valve (141) is opened to the set value; Step 24, the steam valve (141) of the first hydrolysis pot is opened to a set value and maintained for a set time; Step 25, the preheating pot stirrer (211) is stopped, Step 26, the stop time of the preheating pot agitator (211) reaches the set value; the steam valve (141) of the first hydrolysis pot is opened to the set value; the preheating pot discharge bottom valve (215) is closed, and the hydrolysis pot feed valve (470) is closed; Step 27, the hydrolysis pot thermometer (421) detects that the temperature in the hydrolysis tank (400) reaches a set value, and the hydrolysis pot differential pressure gauge (422) detects that the pressure difference in the hydrolysis tank (400) reaches a set value, and starts timing, and the timing reaches the set value; Step 28, the steam valve (141) of the first hydrolysis pot is closed; Step 29, the steam valve (141) of the first hydrolysis pot is fully closed and the timing starts, and reaches the set time; Step 30, the steam valve (141) of the first hydrolysis pot is opened to a set value; Step 31, the hydrolysis pot differential pressure gauge (422) detects that the pressure difference in the hydrolysis tank (400) reaches a specific value; the first hydrolysis pot steam valve (141) is closed; Step 32, after the first hydrolysis pot steam valve (141) is closed for 5 seconds, the hydrolysis pot chimney valve (460) is closed; Step 33, after the chimney valve (460) of the hydrolysis pot is closed, the steam valve (142) of the second hydrolysis pot is opened and the timing is started. After the set time is reached, the steam valve (142) of the second hydrolysis pot is closed; Step 34, after the second hydrolysis pot steam valve (142) is closed for 5 seconds, the hydrolysis pot chimney valve (460) is opened; Step 35, detecting that the liquid level of the storage tank (510) after hydrolysis is lower than the liquid level setting value; the bottom valve (430) of the hydrolysis pot is opened; Step 36, manually judge that the material discharge is completed, and click to end the material discharge; Step 37, the first hydrolysis pot washing valve (441), the first hydrolysis pot washing motor (451), the second hydrolysis pot washing valve (442), and the second hydrolysis pot washing motor (452) are turned on to the set time; Step 38, the first hydrolysis pot washing valve (441), the first hydrolysis pot washing motor (451), the second hydrolysis pot washing valve (442), and the second hydrolysis pot washing motor (452) are closed; Step 39: The DCS system automatically detects the start conditions and automatically repeats steps 1-39 to achieve automatic control.

Images