A titanium liquid concentration system

Abstract

The utility model discloses a titanium liquid concentration system, which belongs to the technical field of titanium dioxide production. The utility model solves the problem that the waste gas treatment process of the current concentration system in the prior art is lengthy and the vacuum stability is poor. The utility model includes a thin film evaporator, the steam inlet of the thin film evaporator is connected to a steam supply mechanism, the feed port of the thin film evaporator is connected to a titanium liquid supply mechanism, and the steam supply mechanism is connected to an atomizing condenser. The utility model improves the double-effect concentration process, and uses an atomizing condenser to replace the tail gas preheater, mixing condenser, water ring vacuum pump and other equipment of the original double-effect concentration system, while maintaining a stable vacuum degree of the system and stable quality of the titanium liquid, saving electricity and reducing production accidents caused by blockage of the equipment structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of titanium dioxide production, and specifically relates to a titanium liquid concentration system. Background Art

[0002] Since the sulfuric acid method is a wet production method, it consumes a lot of steam, water and energy. In addition, in order to improve product quality, the titanium liquid needs to be concentrated before the hydrolysis of titanium dioxide to increase the concentration of titanium dioxide and the total ion mass concentration. At present, a thin film evaporator is usually used to evaporate and concentrate the titanium liquid to meet the requirements of hydrolysis. The existing thin film evaporation device has a long process and high secondary steam loss. In addition, the effective and stable control of steam utilization efficiency and vacuum degree directly affects the concentration efficiency. The original concentration system uses a mixed condenser to treat acidic waste gas, and water is directly mixed with waste steam to condense the waste steam. However, the waste steam also contains a small amount of air and uncondensed water vapor. When discharging the condensed water, these gases must be discharged together to maintain the system vacuum degree. Therefore, it is necessary to pump and exhaust, otherwise it will affect the concentration effect of the titanium liquid. Therefore, the current waste gas treatment process of the concentration system is lengthy and the vacuum stability is poor. Utility Model Content

[0003] Aiming at the problems that the waste gas treatment process of the current concentration system in the prior art is lengthy and the vacuum stability is poor, the utility model provides a titanium liquid concentration system.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A titanium liquid concentration system comprises a thin film evaporator, a steam inlet of the thin film evaporator is connected to a steam supply mechanism, a feed port of the thin film evaporator is connected to the titanium liquid supply mechanism, and the steam supply mechanism is connected to an atomizing condenser.

[0006] After adopting this technical solution, the utility model improves the double-effect concentration process, and uses an atomizing condenser to replace the tail gas preheater, mixing condenser, water ring vacuum pump and other equipment of the original double-effect concentration system. While maintaining a stable vacuum degree of the system and stable quality of titanium liquid, it saves electricity and reduces production accidents caused by blockage of the equipment structure.

[0007] Preferably, the atomizing condenser includes a condensation chamber, a plurality of atomizing nozzles are arranged in the condensation chamber, and the plurality of atomizing nozzles are evenly arranged in a ring shape in the condensation chamber. A rotating platform is provided on the top of the condensation chamber, a cavity is provided in the rotating platform, a plurality of exhaust ports are provided at the bottom of the cavity, and the cavity is connected to the exhaust gas discharge pipe of the titanium liquid supply mechanism.

[0008] After adopting this technical solution, a rotating platform with a cavity is provided in the utility model. When the exhaust gas discharged into the cavity is discharged from the exhaust port, the centrifugal force generated by the rotation of the rotating platform can quickly throw out the gas in the cavity, and the exhaust gas can be dispersed so that the dispersed gas can fully contact with the mist condensed water sprayed by each nozzle, thereby improving the efficiency of heat exchange.

[0009] Preferably, the exhaust port comprises a vertical exhaust port and an inclined exhaust port, the vertical exhaust port is arranged in the middle of the rotating platform, the inclined exhaust port surrounds the vertical exhaust port, and the inclined exhaust port is inclined toward a side close to the inner wall of the condensation chamber.

[0010] After adopting this technical solution, the exhaust port is set to be vertical and inclined, so that the exhaust gas can be discharged into the condensation chamber more evenly.

[0011] Preferably, the liquid inlet of the atomizing condenser is connected to a filter, and the filter is connected to a water source.

[0012] After adopting this technical solution, the water is treated through a filter and then atomized to avoid impurities in the water causing equipment to be blocked and difficult to clean.

[0013] Preferably, the steam supply mechanism comprises a preheater, the preheater is connected to a primary heater, the primary heater is connected to a primary evaporator, and the primary evaporator is connected to a steam inlet of the thin film evaporator.

[0014] Preferably, the preheater is connected to a gas-liquid separator, the gas-liquid separator is connected to a first liquid seal groove, the primary evaporator is connected to the gas-liquid separator, the thin film evaporator is connected to a cyclone separator, the cyclone separator is connected to the primary heater and the preheater, and the cyclone separator is connected to a second liquid seal groove.

[0015] Preferably, the atomizing condenser is connected to a circulating water buffer tank, and the circulating water buffer tank is connected to a return water tank.

[0016] Preferably, the thin film evaporator is connected to a titanium liquid sealing tank.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] 1. The utility model improves the double-effect concentration process, and uses an atomizing condenser to replace the tail gas preheater, mixing condenser, water ring vacuum pump and other equipment of the original double-effect concentration system. While maintaining a stable vacuum degree of the system and stable quality of titanium liquid, it saves electricity and reduces production accidents caused by blockage of the equipment structure.

[0019] 2. The utility model is provided with a rotating platform with a cavity. When the exhaust gas discharged into the cavity is discharged from the exhaust port, the centrifugal force generated by the rotation of the rotating platform can quickly throw out the gas in the cavity, and the exhaust gas can be dispersed, so that the dispersed gas can fully contact with the mist condensed water sprayed by each nozzle, thereby improving the efficiency of heat exchange.

[0020] 3. In the utility model, water is treated by a filter and then atomized to avoid equipment clogging and cleaning difficulties caused by impurities in the water. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the condensation chamber in the utility model;

[0024] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0025] Among them, 1-thin film evaporator, 2-titanium liquid sealing tank, 3-cyclone separator, 4-first stage heater, 5-preheater, 6-gas-liquid separator, 7-first liquid sealing tank, 8-second liquid sealing tank, 9-first stage evaporator, 10-atomizing condenser, 1001-condensing chamber, 1002-atomizing nozzle, 1003-waste gas exhaust pipe, 1004-cavity, 1005-exhaust port, 11-circulating water buffer tank, 12-return water tank. DETAILED DESCRIPTION

[0026] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0027] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0028] Combine the following Figure 1-Figure 3 The utility model is described in detail.

[0029] Example 1

[0030] like Figure 1 As shown, a titanium liquid concentration system includes a thin film evaporator 1, the steam inlet of the thin film evaporator 1 is connected to a steam supply mechanism, the feed port of the thin film evaporator 1 is connected to a titanium liquid supply mechanism, and the steam supply mechanism is connected to an atomizing condenser 10. The utility model improves the double-effect concentration process, and uses an atomizing condenser to replace the tail gas preheater, mixing condenser and water ring vacuum pump of the original double-effect concentration system. While maintaining a stable vacuum degree of the system and stable quality of titanium liquid, it saves electricity and reduces production accidents caused by blockage of the equipment structure.

[0031] In this embodiment, cooling water at a temperature of 25°C is passed into the atomizing condenser at a water pressure of 0.16Mpa for atomization to obtain condensed mist, and the exhaust gas discharged from the concentration system is passed into the atomizing condenser to make the condensed mist fully contact with the exhaust gas discharged from the concentration system, and the gas and liquid are evenly mixed, so that the exhaust gas is quickly condensed into water to form a stable vacuum. The vacuum degree during the concentration process is 95kpa.

[0032] In this embodiment, the steam supply mechanism includes a preheater 5 , the preheater 5 is connected to a primary heater 4 , the primary heater 4 is connected to a primary evaporator 9 , and the primary evaporator 9 is connected to the steam inlet of the thin film evaporator 1 .

[0033] In this embodiment, the preheater 5 is connected to a gas-liquid separator 6, the gas-liquid separator 6 is connected to a first liquid seal groove 7, the primary evaporator 9 is connected to the gas-liquid separator 6, the thin film evaporator 1 is connected to a cyclone separator 3, the cyclone separator 3 is connected to the primary heater 4 and the preheater 5, and the cyclone separator 3 is connected to a second liquid seal groove 8.

[0034] In this embodiment, the atomizing condenser 10 is connected to a circulating water buffer tank 11, and the circulating water buffer tank 11 is used to receive the circulating water discharged from the circulating water buffer tank 11. The circulating water buffer tank 11 is connected to a return water tank 12, and the circulating water discharged from the circulating water buffer tank 11 enters the return water tank 12 and waits for recycling.

[0035] In this embodiment, the thin film evaporator 1 is connected to a titanium liquid sealing tank 2 .

[0036] In this embodiment, the temperature of condensed water discharged from the concentration system is 45° C., the temperature of the discharged titanium liquid is 73° C., and the concentration of the titanium liquid after concentration is 194 g / L.

[0037] The specific use method of the utility model is as follows:

[0038] Reference Figure 1-Figure 3 , check and confirm that the main equipment and auxiliary equipment of the device are in good condition; close the drain valve on the feed pipeline and open the drain valve on the gas phase outlet pipe of the gas-liquid separator; open the secondary steam preheater and the first-stage heater 4 shell side drain and drain valves; switch the overflow control valve of the concentrated titanium liquid seal tank 2 to the refined titanium liquid tank and inject water into the return water tank to ensure that the liquid level in the return water tank can play an effective liquid seal role.

[0039] 1. Open the device inlet control valve of refined titanium liquid to feed into the system until refined titanium liquid overflows into the refined titanium liquid tank. Then close the titanium liquid feed control valve, and check whether there is titanium liquid out of the secondary steam preheater and the first-stage heater 4 shell exhaust port.

[0040] 2 Close the secondary steam preheater, the first-stage heater 4 shell side emptying and drain valves and the lower valve of the vapor-liquid separator, open the water inlet valve of the atomizing condenser 10, and make the negative pressure of the first and second stage evaporators reach -0.092MPa (gauge pressure), indicating that the system is airtight and meets the start-up requirements.

[0041] 3 Open the butterfly valve and exhaust ball valve on the gas-liquid separator 6 outlet pipe, control the opening, ensure that the gas phase pressure of the secondary evaporator is about -0.072MPa, then open the gas-liquid separator liquid outlet valve, and control the gas phase pressure of the secondary evaporator to be ≥-0.080MPa.

[0042] 4. Open the device’s titanium liquid inlet control valve to feed the system, and control the feed volume to about 10-15m 3 / h or so, then open the secondary heater air inlet valve, open it a little bit first, and then adjust it according to the temperature rise of the secondary heater.

[0043] 5 When the secondary evaporator starts evaporating, the opening of the secondary heater air inlet regulating valve is adjusted to control the heating rate of the primary heater to 3-5℃ / h. Initially, the steam intake volume is controlled at about 1t / h, and the steam flow rate is increased step by step according to the heating rate requirements of the primary heater.

[0044] 6 During the heating process, if the negative pressure of the evaporator does not meet the process requirements, the negative pressure of the evaporator can be adjusted to -0.072MPa by reducing or closing the exhaust ball valve on the outlet pipeline of the gas-liquid separator and increasing the opening of the butterfly valve on the pipeline.

[0045] 7 When the gas phase temperature of the first and second evaporators begins to rise, it indicates that the first and second evaporation systems have entered the evaporation stage from the heating stage. When the first evaporator begins to evaporate, the air intake can be increased step by step (less than or equal to 5t / h), and there is no need to consider the heating speed of the first heater.

[0046] 8 When the gas phase negative pressure of the secondary evaporator is about -0.072MPa and the liquid phase temperature reaches 76.5℃, the concentration of the finished titanium liquid has reached about 185g / L~195g / L. And through sampling to test whether its concentration and stability meet the index requirements. After passing the inspection, switch the control valve on the concentrated titanium liquid sealing tank to the titanium liquid mixing tank.

[0047] 9. After the concentration of concentrated titanium liquid reaches the requirement, adjust the feed control valve to gradually increase the feed amount of refined titanium liquid to 20-35m3. 3 / h, adjust the steam flow rate according to the concentration of the liquid seal tank and the mixing tank to ensure the concentration is qualified.

[0048] 10 When the system operates normally, the pressure of the sewage circulating water in a single set shall be ≥0.08MPa (gauge pressure), the flow rate shall be ≥300m3 / h, and the inlet water temperature shall be ≤34℃.

[0049] 5.3.2.11 When the liquid level in the titanium liquid mixing tank is ≥2.5m, the hydrolysis station can be notified to transfer the material.

[0050] 5.3.2.12 When the pH value of the return water tank drops below 6.5, open the valve for adding liquid alkali and add liquid alkali into the return water tank to ensure that the pH value is between 6.5 and 7.5.

[0051] Benefit Calculation Instructions

[0052] Motor shaft power calculation formula P = ρgQH / (n1n2)

[0053] P: power, unit W; ρ: density, unit kg / m 3 ; g: acceleration due to gravity = 9.81 m 3 / s; Q: flow rate, unit: m 3 / s; H: head, unit: m; n1 and n2 are the efficiency of the pump and motor respectively, ranging from 0.6 to 0.9, taking n1*n2=0.8, when the medium is water, the formula can be simplified to P=1000*9.81*Q*H / 3600 / 0.8 / 1000=Q*H / 367 / 0.8, unit: Kw

[0054] Before the transformation, the power of the water ring vacuum pump was 37kw, the operating time was 108 days, and the unit price of electricity was 0.68 yuan / kWh. The power consumption saved by eliminating the water ring vacuum pump is 37*0.8*108*24*0.68 / 10000≈52,200 yuan; the net circulating water flow is about 150m 3 / h, head is 35m, the power consumption saved by canceling the clean circulating water is 150*35 / 367 / 0.8*108*24*0.68 / 10000≈31,500 yuan; the flow rate of sewage circulating water before the transformation is about 180m 3 / h, after transformation, the flow rate increased to 500m 3 / h, the lift is about 35m, then the increased power consumption due to the increase in water volume is (500-180)*35 / 367 / 0.8*108*24*0.68 / 10000≈67,200 yuan; because it runs for 108 days, the benefit generated during the period is 52,200+31,500-67,200=16,500 yuan.

[0055] Example 2

[0056] This embodiment is basically the same as the embodiment 1, except that: in this embodiment, the liquid inlet of the atomizing condenser 10 is connected to a filter, and the filter is connected to a water source. The water is treated by the filter before atomization to avoid the equipment being blocked by impurities in the water and the occurrence of cleaning difficulties. In this embodiment, the parameters of the filter are: output frequency 900KHZ-5.5MHZ, output waveform: sine wave, harmonic, and water inlet temperature 10-95℃.

[0057] Example 3

[0058] like Figure 2As shown, this embodiment is basically the same as embodiment 1, except that: in this embodiment, the atomizing condenser 10 includes a condensing chamber 1001, a plurality of atomizing nozzles 1002 are arranged in the condensing chamber 1001, and the plurality of atomizing nozzles 1002 are evenly arranged in a ring shape in the condensing chamber 1001, a rotating platform is arranged at the top of the condensing chamber 1001, a cavity 1004 is arranged in the rotating platform, a plurality of exhaust ports 1005 are arranged at the bottom of the cavity 1004, and the cavity 1004 is connected to the exhaust pipe 1003 of the titanium liquid supply mechanism. In this embodiment, a rotating platform with a cavity 1004 is arranged, and when the exhaust gas discharged into the cavity 1004 is discharged from the exhaust port 1005, the gas in the cavity 1004 can be quickly thrown out due to the centrifugal force generated by the rotation of the rotating platform, and the exhaust gas can be dispersed, so that the dispersed gas is fully in contact with the mist condensed water sprayed by each atomizing nozzle 1002, thereby improving the efficiency of heat exchange.

[0059] Example 4

[0060] like Figure 3 As shown, this embodiment is basically the same as Embodiment 2, except that: in this embodiment, the exhaust port 1005 includes a vertical exhaust port and an inclined exhaust port, the vertical exhaust port is arranged in the middle of the rotating platform, the inclined exhaust port surrounds the vertical exhaust port, and the inclined exhaust port is inclined toward a side close to the inner wall of the condensing chamber 1001. The exhaust port 1005 is arranged in a vertical shape and an inclined shape, so that the exhaust gas is discharged to the condensing chamber 1001 more evenly.

[0061] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A titanium liquid concentration system, characterized in that: It comprises a thin film evaporator (1), wherein the steam inlet of the thin film evaporator (1) is connected to a steam supply mechanism, the feed port of the thin film evaporator (1) is connected to a titanium liquid supply mechanism, and the steam supply mechanism is connected to an atomizing condenser (10).

2. A titanium liquid concentration system according to claim 1, characterized in that: The atomizing condenser (10) includes a condensing chamber (1001), and a plurality of atomizing nozzles (1002) are arranged in the condensing chamber (1001), and the plurality of atomizing nozzles (1002) are evenly arranged in a ring shape in the condensing chamber (1001). A rotating platform is arranged on the top of the condensing chamber (1001), and a cavity (1004) is arranged in the rotating platform. A plurality of exhaust ports (1005) are arranged at the bottom of the cavity (1004), and the cavity (1004) is connected to the exhaust gas exhaust pipe (1003) of the titanium liquid supply mechanism.

3. A titanium liquid concentration system according to claim 2, characterized in that: The exhaust port (1005) comprises a vertical exhaust port and an inclined exhaust port, wherein the vertical exhaust port is arranged in the middle of the rotating platform, and the inclined exhaust port surrounds the vertical exhaust port, and the inclined exhaust port is inclined toward a side close to the inner wall of the condensation chamber (1001).

4. A titanium liquid concentration system according to any one of claims 1 to 3, characterized in that: The liquid inlet of the atomizing condenser (10) is connected to a filter, and the filter is connected to a water source.

5. A titanium liquid concentration system according to any one of claims 1 to 3, characterized in that: The steam supply mechanism comprises a preheater (5), the preheater (5) is connected to a primary heater (4), the primary heater (4) is connected to a primary evaporator (9), and the primary evaporator (9) is connected to the steam inlet of the thin film evaporator (1).

6. A titanium liquid concentration system according to claim 5, characterized in that: The preheater (5) is connected to a gas-liquid separator (6), the gas-liquid separator (6) is connected to a first liquid sealing groove (7), the first-stage evaporator (9) is connected to the gas-liquid separator (6), the thin-film evaporator (1) is connected to a cyclone separator (3), the cyclone separator (3) is connected to a first-stage heater (4) and the preheater (5), and the cyclone separator (3) is connected to a second liquid sealing groove (8).

7. A titanium liquid concentration system according to any one of claims 1 to 3, characterized in that: The atomizing condenser (10) is connected to a circulating water buffer tank (11), and the circulating water buffer tank is connected to a return water tank (12).

8. A titanium liquid concentration system according to any one of claims 1 to 3, characterized in that: The thin film evaporator (1) is connected to a titanium liquid sealing tank (2).

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