Process for recycling steam condensate water in titanium dioxide production

Abstract

The invention relates to the technical field of titanium dioxide processing equipment, in particular to a steam condensate water recycling process in titanium dioxide production, steam condensate water and spraying water are collected, then the water is returned to be used for steam cooling and spraying, and due to the fact that the temperature of the sprayed condensate water is lower than 90 DEG C, the effect of rapidly cooling steam can be achieved. Water is recycled in a steam condensate water recycling process in titanium dioxide production, but the steam condensate water is continuously increased, and the water cooled by the steam is clean desalted water, so that the water can be used for diluting coating slurry or washing a filter press, and the effect of recycling the steam condensate water is realized; spraying fresh desalted water, filter pressing fresh desalted water, enveloping fresh desalted water and steam used for filter pressing and enveloping fresh desalted water can be saved, zero discharge of steam condensate water is also achieved, and environmental pollution is reduced.

Description

Technical Field

[0001] This invention relates to the field of titanium dioxide processing equipment technology, and more specifically, to a process for recycling steam condensate in titanium dioxide production. Background Technology

[0002] The gas-powder mill uses high-temperature, medium-pressure steam to pulverize titanium dioxide. After passing through the gas-powder system, the steam needs to be quickly cooled with cold water to ensure that the pressure of the gas-powder system is normal.

[0003] The typical process involves spraying steam with demineralized water at room temperature to rapidly cool it. The cooled steam then forms condensate, which, along with the water used for spraying, is directly discharged. This method consumes a large amount of demineralized water, increasing production costs. Furthermore, if the condensate contains impurities, direct discharge can negatively impact the environment. Summary of the Invention

[0004] The purpose of this invention is to provide a process for recycling steam condensate in titanium dioxide production, in order to solve the problems mentioned in the background art, such as the large amount of demineralized water used for spraying, which increases production costs, and the fact that the condensate contains impurities and direct discharge will affect the environment.

[0005] To achieve the above objectives, the present invention provides a process for recycling steam condensate in titanium dioxide production, comprising the following steps:

[0006] S1. The steam pulverizer uses high-temperature and medium-pressure steam to pulverize titanium dioxide. The exhaust gas generated enters the spray chamber and is sprayed through the spray system.

[0007] S2. The steam is rapidly cooled by spraying water in the spray chamber, and the condensate and spray water are stored together in the spray chamber.

[0008] S3. The condensate and spray water in the spray chamber are sent to the condensate collection tank for collection.

[0009] S4. The water in the condensate collection tank is pumped back to the spray system in the spray chamber for spraying purposes.

[0010] S5. The water is recycled through the above steps;

[0011] S6. After repeated use, the water temperature in the condensate collection tank will continue to increase. When it increases to a temperature that is insufficient to cool the steam, it will be sent through pipelines to the coating machine and filter press for dilution of the coating slurry or washing of the filter press.

[0012] This setup establishes a condensate recycling and cascade utilization process, reducing the consumption of fresh demineralized water and lowering production costs; it also avoids environmental pollution caused by direct discharge of condensate, achieving efficient use of water resources while ensuring stable pressure in the gas-powder system.

[0013] As a preferred embodiment of the present invention, the temperature of the exhaust gas after pulverizing titanium dioxide is 160-220°C, and the temperature after spraying in the spray chamber is less than 90°C.

[0014] This setting clearly defines the temperature parameters before and after exhaust gas spraying, ensuring that the steam cools down quickly to a reasonable range, maintaining the pressure balance of the gas-powder system, laying the temperature foundation for condensate recycling, and improving process stability.

[0015] As a preferred embodiment of the present invention, in step S6, the temperature of the steam that is insufficient to cool is set to 60-90°C.

[0016] This setting defines the condensate cooling failure temperature threshold, clearly delineates the switching points between circulating spray and cascade utilization, takes into account both steam cooling efficiency and secondary water resource utilization, and improves resource utilization.

[0017] As a preferred embodiment of the present invention, the water inlet of the spray chamber is temperature-detected by a temperature sensor to determine the inlet water temperature. When the inlet water temperature is sufficient to cool the steam, it is pumped back to the spray chamber for continued spraying. When the inlet water temperature is insufficient to cool the steam, the condensate is sent to the coating machine and the filter press.

[0018] This feature uses a temperature sensor to automatically regulate the flow of condensate, enabling intelligent switching between circulating spraying and cascade utilization. This saves fresh demineralized water and associated heating steam in multiple stages, improving the automation level and economy of the process.

[0019] As a preferred embodiment of the present invention, a liquid level sensor is installed in the spray chamber to detect the liquid level of the water in the spray chamber in real time. When the liquid level of the water reaches the preset drainage height, the water is discharged into the condensate collection tank.

[0020] This feature uses a liquid level sensor to monitor the liquid level in real time, enabling quantitative and orderly recovery of condensate, avoiding abnormal liquid levels in the spray chamber from affecting the cooling effect, and ensuring the smooth operation of the circulation system.

[0021] As a preferred embodiment of the present invention, the apparatus for the steam condensate recycling process in titanium dioxide production includes a spray chamber, a condensate collection tank, a condensate discharge pipe, and a condensate recovery pipe. The spray chamber is connected to the condensate collection tank via the collection pipe. One end of the condensate discharge pipe is connected to the bottom of the condensate collection tank. The middle part of the condensate discharge pipe is connected to the bottom end of the condensate recovery pipe via a T-junction. The other end of the condensate discharge pipe is connected to the coating machine and the filter press. The top end of the condensate recovery pipe is connected to the top of the spray chamber.

[0022] This setup constructs a closed-loop system of "spraying-recovery-circulation-cascade utilization" through pipeline connections, ensuring the orderly flow of condensate between various devices and providing structural support for water recycling and cascade adaptation.

[0023] As a preferred embodiment of the present invention, the spraying system in the spraying chamber is a spraying plate, the top of the spraying plate is connected to a conveying pipe, the top of the conveying pipe is connected to a condensate recovery pipe, the spraying plate is provided with water channels inside, and the bottom of the spraying plate is equipped with nozzles. Water enters the water channels of the spraying plate through the conveying pipe and is then sprayed out from the nozzles for spraying.

[0024] This spray system design ensures uniform water spraying, increases the contact area with steam, improves steam cooling rate and uniformity, and guarantees cooling effect.

[0025] As a preferred embodiment of the present invention, the surface of the spray plate is provided with vent holes, the upper outer wall of the spray chamber is provided with a steam outlet, the lower outer wall of the spray chamber is provided with a steam inlet, and the steam inlet is connected to a steam inlet pipe.

[0026] This feature includes vents and inlet / outlet structures to ensure steam flow and exhaust gas discharge, maintain pressure balance within the spray chamber, improve cooling efficiency, and ensure production safety.

[0027] As a preferred embodiment of the present invention, a conveying valve is installed on the collecting pipe, a drain valve is installed on the condensate discharge pipe on one side of the condensate recovery pipe, a filter membrane valve is installed on the condensate discharge pipe on the other side of the condensate recovery pipe, and a water pump is installed on the condensate recovery pipe.

[0028] This system, with its valves working in conjunction with the water pump, precisely controls the flow of water through the pipeline and provides circulation power, ensuring controllable and smooth system operation and improving the convenience and stability of process operations.

[0029] As a preferred embodiment of the present invention, the nozzles are arranged in parallel at equal intervals.

[0030] This nozzle arrangement design enables large-area uniform coverage of spray water, avoids insufficient local steam cooling, improves cooling uniformity and efficiency, and ensures stable operation of the air-powder system.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] 1. In the process of recycling steam condensate in the production of titanium dioxide, steam condensate and spray water are collected and then returned to steam cooling spray. Since the temperature of the condensate after spraying is below 90℃, the steam can be cooled quickly.

[0033] 2. In the steam condensate recycling process of titanium dioxide production, water is recycled. However, because the amount of steam condensate is constantly increasing, and the water after steam cooling is clean demineralized water, this part of the water can be used for diluting the coating slurry or washing the filter press. This achieves the effect of steam condensate recycling, which can save the steam used for spraying fresh demineralized water, pressing fresh demineralized water, coating fresh demineralized water, and steam used for pressing and coating fresh demineralized water. It also achieves zero discharge of steam condensate and reduces environmental pollution. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 This is a schematic diagram of the internal structure of the spray chamber in this invention.

[0036] The meanings of the labels in the diagram are as follows:

[0037] 1. Spray chamber; 11. Spray plate; 111. Vent hole; 12. Spray head; 13. Conveying pipe; 14. Steam inlet; 15. Steam outlet; 2. Steam inlet pipe; 3. Collection pipe; 31. Conveying valve; 4. Condensate collection tank; 5. Condensate discharge pipe; 51. Drain valve; 52. Filter press membrane valve; 6. Condensate recovery pipe; 7. Water pump. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] This invention provides a process for recycling steam condensate in titanium dioxide production, such as... Figures 1-2 As shown, it includes the following steps:

[0040] S1. The steam pulverizer uses high-temperature medium-pressure steam to pulverize titanium dioxide. The exhaust gas generated enters the spray chamber and is sprayed through the spray system to ensure that the steam is cooled.

[0041] S2. The steam is rapidly cooled by spraying water in the spray chamber. The condensate and spray water are stored together in the spray chamber to ensure that the high temperature steam in the steam-powder turbine is effectively cooled and to ensure the pressure of the steam-powder system is stable.

[0042] S3. Send the condensate and spray water in the spray chamber into the condensate collection tank for collection and recycling of the condensate;

[0043] S4. The water in the condensate collection tank is pumped back to the spray system in the spray chamber for spraying. Since the temperature of the condensate after spraying is below 90℃, it can achieve the effect of rapidly cooling the steam.

[0044] S5. By recycling water through the above steps, zero discharge of steam condensate is achieved, reducing environmental pollution;

[0045] S6. After repeated use, the water temperature in the condensate collection tank will continue to increase. When it increases to a temperature that is insufficient to cool the steam, it will be sent through pipelines to the coating machine and filter press for dilution of the coating slurry or washing of the filter press.

[0046] The exhaust gas is cooled by spraying in the spray chamber, and the condensate and spray water are recycled and reused. After being heated, the water is transported in stages to the coating machine and filter press. This achieves rapid cooling of steam (ensuring stable pressure in the gas-powder system) and zero discharge of condensate, reducing environmental pollution. At the same time, it avoids the large consumption of fresh demineralized water, reduces the cost of production water and supporting steam, and achieves efficient utilization of water resources in stages, taking into account both production stability and environmental and economic benefits.

[0047] In this embodiment, the temperature of the exhaust gas after pulverizing titanium dioxide is 160-220℃, and the temperature after spraying in the spray chamber is less than 90℃.

[0048] The initial exhaust gas temperature is set at 160-220℃, and the temperature after spraying is set at <90℃. The cooling range is precisely controlled to ensure that the steam is rapidly cooled to a safe range. This avoids the high-temperature exhaust gas from stagnating and affecting the pressure balance of the gas-powder system, provides suitable temperature conditions for subsequent condensate recycling, ensures controllable process parameters, and improves production stability.

[0049] Specifically, in step S6, the temperature of the steam that is insufficient to cool it is set to 60-90°C.

[0050] Setting 60-90℃ as the cooling failure temperature threshold clearly defines the switching point between condensate circulation spraying and cascade utilization. This avoids the decrease in steam cooling efficiency due to excessively high water temperature, and provides a suitable water temperature for coating slurry dilution and filter press washing, eliminating the need for additional heating or cooling, thus improving water resource utilization and process adaptability.

[0051] Furthermore, the water inlet of the spray chamber is temperature-detected by a temperature sensor to determine the inlet water temperature. When the inlet water temperature is sufficient to cool the steam, it is pumped back to the spray chamber for continued spraying. When the inlet water temperature is insufficient to cool the steam, the condensate is sent to the coating machine and filter press. This achieves the effect of recycling steam condensate, which can save the steam used for spraying fresh demineralized water, pressing fresh demineralized water, coating fresh demineralized water, and steam used for pressing and coating fresh demineralized water.

[0052] The system uses a temperature sensor at the inlet of the spray chamber to detect water in real time and automatically switches the water flow direction (if the water meets the standard, it is circulated for spraying; if it fails, it is sent to the coating machine and filter press). This enables intelligent utilization of condensate, significantly saving fresh desalinated water and supporting heating steam in the spraying, filtration, and coating processes, reducing production costs, and improving the level of process automation.

[0053] Furthermore, a liquid level sensor is installed inside the spray chamber to detect the water level in real time. When the water level reaches the preset drainage height, the water is discharged into the condensate collection tank, which facilitates the quantitative discharge of condensate.

[0054] The liquid level sensor 1 in the spray chamber monitors the liquid level in real time. When the preset height is reached, the liquid is discharged quantitatively into the condensate collection tank 4. This avoids the liquid level in the chamber being too high, which would affect the spraying effect, or too low, which would result in insufficient cooling. This achieves orderly recovery of condensate, ensures stable liquid level in the circulation system, and improves operational controllability and process continuity.

[0055] Furthermore, the device for the steam condensate recycling process in titanium dioxide production includes a spray chamber 1, a condensate collection tank 4, a condensate discharge pipe 5, and a condensate recovery pipe 6. The spray chamber 1 is connected to the condensate collection tank 4 via a collection pipe 3. One end of the condensate discharge pipe 5 is connected to the bottom of the condensate collection tank 4, and the middle part of the condensate discharge pipe 5 is connected to the bottom end of the condensate recovery pipe 6 via a T-connector. The other end of the condensate discharge pipe 5 is connected to the coating machine and the filter press. The top end of the condensate recovery pipe 6 is connected to the top of the spray chamber 1, and water is sent to the top of the spray chamber 1 to continue the spraying operation, thereby realizing the circulation of water.

[0056] By connecting the collection pipe 3, condensate discharge pipe 5, and condensate recovery pipe 6, a closed-loop system of "spraying-recovery-circulation-cascade utilization" is constructed, realizing the orderly flow of condensate between the spray chamber 1 and the condensate collection tank 4, and the subsequent directional delivery to the coating machine and filter press, ensuring smooth water resource recycling and reducing waste.

[0057] Furthermore, the spraying system inside the spraying chamber 1 is a spraying plate 11. The top of the spraying plate 11 is connected to a conveying pipe 13, and the top of the conveying pipe 13 is connected to a condensate recovery pipe 6. The spraying plate 11 has water channels inside, and a nozzle 12 is installed at the bottom of the spraying plate 11. Water enters the water channels of the spraying plate 11 through the conveying pipe 13 and is then sprayed out from the nozzle 12 to spray and cool the steam evenly.

[0058] The spray plate 11 is connected to the condensate recovery pipe 6 through the delivery pipe 13. Water is delivered to the bottom nozzle 12 through the internal water channel to achieve uniform spraying of spray water, increase the contact area with steam, improve the steam cooling rate and uniformity, ensure that the exhaust gas temperature drops quickly to the standard range, and ensure the stable pressure of the gas-powder system.

[0059] Furthermore, the surface of the spray plate 11 is provided with vent holes 111, the upper outer wall of the spray chamber 1 is provided with a steam outlet 15 for discharging the remaining gas without steam, and the lower outer wall of the spray chamber 1 is provided with a steam inlet 14, which is connected to a steam inlet pipe 2 to facilitate the entry of steam.

[0060] The vent holes 111 on the surface of the spray plate 11 ensure steam circulation. The steam outlet 15 at the top of the spray chamber 1 facilitates the discharge of cooled exhaust gas. The steam inlet 14 at the bottom (connected to the external steam inlet pipe 2) enables the directional introduction of high-temperature exhaust gas, avoids pressure buildup in the chamber, ensures full contact between steam and spray water, improves cooling efficiency, and maintains pressure balance in the chamber to ensure production safety.

[0061] Furthermore, a conveying valve 31 is installed on the collection pipe 3, a drain valve 51 is installed on the condensate discharge pipe 5 on one side of the condensate recovery pipe 6, a filter press valve 52 is installed on the condensate discharge pipe 5 on the other side of the condensate recovery pipe 6, and a water pump 7 is installed on the condensate recovery pipe 6.

[0062] The conveying valve 31 on the collection pipe 3, the drain valve 51 on the condensate discharge pipe 5, and the filter membrane valve 52 can precisely control the opening and closing of each pipeline; the water pump 7 on the condensate recovery pipe 6 provides power for water circulation, realizing precise control of condensate recovery, circulating spraying and cascade conveying, ensuring smooth system operation and improving operational controllability.

[0063] Furthermore, the nozzles 12 are arranged in parallel at equal intervals to ensure uniform and large-area spraying of steam, thereby achieving a rapid reduction in steam temperature.

[0064] The 12 nozzles are arranged in parallel and at equal intervals to achieve large-area uniform coverage of spray water, avoid insufficient local steam cooling, ensure uniform and rapid cooling of exhaust gas, ensure that the temperature meets the standard after spraying, maintain stable pressure of the gas-powder system, further optimize the steam cooling effect, and improve process reliability.

[0065] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for recycling steam condensate in titanium dioxide production, characterized in that: Includes the following steps: S1. The steam pulverizer uses high-temperature and medium-pressure steam to pulverize titanium dioxide. The exhaust gas generated enters the spray chamber and is sprayed through the spray system. S2. The steam is rapidly cooled by spraying water in the spray chamber, and the condensate and spray water are stored together in the spray chamber. S3. The condensate and spray water in the spray chamber are sent to the condensate collection tank for collection. S4. The water in the condensate collection tank is pumped back to the spray system in the spray chamber for spraying purposes. S5. The water is recycled through the above steps; S6. After repeated use, the water temperature in the condensate collection tank will continue to increase. When it increases to a temperature that is insufficient to cool the steam, it will be sent through pipelines to the coating machine and filter press for dilution of the coating slurry or washing of the filter press.

2. The process for recycling steam condensate in titanium dioxide production according to claim 1, characterized in that: The temperature of the exhaust gas after crushing titanium dioxide is 160-220℃, and the temperature after spraying in the spray chamber is less than 90℃.

3. The process for recycling steam condensate in titanium dioxide production according to claim 1, characterized in that: In step S6, the temperature of the insufficient cooling steam is set to 60-90°C.

4. The process for recycling steam condensate in titanium dioxide production according to claim 3, characterized in that: The water inlet of the spray chamber is temperature-detected by a temperature sensor to determine the inlet water temperature. When the inlet water temperature is sufficient to cool the steam, it is pumped back to the spray chamber for continued spraying. When the inlet water temperature is insufficient to cool the steam, the condensate is sent to the coating machine and filter press.

5. The process for recycling steam condensate in titanium dioxide production according to claim 1, characterized in that: A liquid level sensor is installed inside the spray chamber to detect the water level in real time. When the water level reaches the preset drainage height, the water is discharged into the condensate collection tank.

6. The process for recycling steam condensate in titanium dioxide production according to claim 1, characterized in that: The apparatus for the steam condensate recycling process in titanium dioxide production includes a spray chamber (1), a condensate collection tank (4), a condensate discharge pipe (5), and a condensate recovery pipe (6). The spray chamber (1) is connected to the condensate collection tank (4) through a collection pipe (3). One end of the condensate discharge pipe (5) is connected to the bottom of the condensate collection tank (4). The middle part of the condensate discharge pipe (5) is connected to the bottom end of the condensate recovery pipe (6) through a three-way pipe. The other end of the condensate discharge pipe (5) is connected to the coating machine and the filter press. The top end of the condensate recovery pipe (6) is connected to the top of the spray chamber (1).

7. The process for recycling steam condensate in titanium dioxide production according to claim 6, characterized in that: The spraying system inside the spraying chamber (1) is a spraying plate (11). The top of the spraying plate (11) is connected to a conveying pipe (13), and the top of the conveying pipe (13) is connected to a condensate recovery pipe (6). The spraying plate (11) has a water channel inside, and a nozzle (12) is installed at the bottom of the spraying plate (11). Water enters the water channel of the spraying plate (11) through the conveying pipe (13) and then sprays out from the nozzle (12) for spraying.

8. The process for recycling steam condensate in titanium dioxide production according to claim 7, characterized in that: The surface of the spray plate (11) is provided with ventilation holes (111), the upper outer wall of the spray chamber (1) is provided with a steam outlet (15), the lower outer wall of the spray chamber (1) is provided with a steam inlet (14), and the steam inlet (14) is connected to a steam inlet pipe (2).

9. The process for recycling steam condensate in titanium dioxide production according to claim 6, characterized in that: A conveying valve (31) is installed on the collection pipe (3), a drain valve (51) is installed on the condensate discharge pipe (5) on one side of the condensate recovery pipe (6), a filter membrane valve (52) is installed on the other side of the condensate discharge pipe (5) on the condensate recovery pipe (6), and a water pump (7) is installed on the condensate recovery pipe (6).

10. The process for recycling steam condensate in titanium dioxide production according to claim 6, characterized in that: The nozzles (12) are arranged in parallel at equal intervals.

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