Sulfuric acid method titanium dioxide rotary kiln tail gas waste heat utilization device

Abstract

The utility model relates to the technical field of rotary kiln tail gas waste heat utilization devices, in particular to a sulfuric acid method titanium dioxide rotary kiln tail gas waste heat utilization device which comprises a rotary kiln main body, a tail gas pipe and a gas inlet pipe, the rotary kiln main body is provided with a waste heat utilization device, the waste heat utilization device comprises a three-way pipe, and a three-way valve is fixedly installed on the three-way pipe. One pipe body of the three-way pipe is fixedly installed on the tail gas pipe, the other pipe body of the three-way pipe is fixedly provided with the blow-off pipe, the blow-off pipe is fixedly provided with the first valve, the remaining pipe body of the three-way pipe is fixedly provided with the gas outlet cover, the coiled pipe is arranged in the gas outlet cover, and one side of the rotary kiln body is provided with the water storage tank and the booster pump. The coiled pipe is fixedly installed at the water outlet end of the booster pump, the conveying pipe is fixedly installed at the tail end of the coiled pipe, the spiral pipe is fixedly installed at the tail end of the conveying pipe, and the backflow pipe is fixedly installed at the tail end of the spiral pipe. The device is convenient for heat recycling and impurity cleaning operation, and is convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kiln tail gas waste heat utilization device, in particular to a sulfuric acid process titanium dioxide rotary kiln tail gas waste heat utilization device. Background Art

[0002] The sulfuric acid method titanium dioxide rotary kiln is a key equipment in the titanium dioxide production process. It is mainly used to calcine and convert specially treated ilmenite. The working principle of the sulfuric acid method titanium dioxide rotary kiln is mainly to input specially treated ilmenite into the tail end of the rotary kiln. The combustion mixing chamber in the direction of the kiln head blows clean flames and hot air into the kiln to dehydrate and calcine the materials. The materials roll in the circumferential direction and move in the axial direction in the kiln, continuously completing the process of dehydration and calcination. Finally, the calcined materials enter the cooler through the unloading device at the bottom of the kiln head cover, and after cooling, screening and other subsequent processes, the finished titanium dioxide is obtained.

[0003] During the production and preparation operation of titanium dioxide rotary kiln using sulfuric acid method, the corresponding tail gas is usually discharged. Since the rotary kiln processing is carried out at high temperature, the discharged tail gas also contains a lot of heat at this time. Directly discharging this part of heat to the outside will cause the heat energy to be wasted. At present, the rotary kiln is usually equipped with a tail gas waste heat utilization device to realize the heat recovery operation in the tail gas, and the tail gas waste heat utilization device generally uses a serpentine tube to pass water for heat exchange operation. However, the conventional tail gas waste heat utilization device can complete the heat exchange operation when in use, but as the use time increases, impurities in the tail gas will adhere to the serpentine tube, and the impurities attached to the serpentine tube are difficult to clean, which will affect the subsequent heat exchange efficiency of the serpentine tube and bring inconvenience to the user. In view of this, we propose a tail gas waste heat utilization device for titanium dioxide rotary kiln using sulfuric acid method. Utility Model Content

[0004] The utility model aims to provide a device for utilizing waste heat from tail gas of a sulfuric acid process titanium dioxide rotary kiln to solve the defects mentioned in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A device for utilizing waste heat from tail gas of a titanium dioxide rotary kiln produced by a sulfuric acid process, comprising a rotary kiln body, an tail gas pipe arranged on the rotary kiln body and an air inlet pipe arranged at the end of the rotary kiln body, the rotary kiln body being provided with a waste heat utilization device, the waste heat utilization device comprising a three-way pipe, a three-way valve being fixedly mounted on the three-way pipe, one of the tube bodies of the three-way pipe being fixedly mounted on the tail gas pipe, a sewage pipe being fixedly mounted on the other tube body of the three-way pipe, a first valve being fixedly mounted on the sewage pipe, an air outlet hood being fixedly mounted in a vertical direction upward on the remaining tube body of the three-way pipe, a serpentine pipe being arranged in the air outlet hood, water being passed through the serpentine pipe for heat exchange operation.

[0007] Preferably, a top cover is fixedly mounted on the top surface of the air outlet hood, an exhaust pipe is fixedly mounted on the top cover, and the exhaust pipe is used for exhaust operation.

[0008] Preferably, the sewage pipe is used for sewage discharge operations, and the exhaust pipe is used for reagent addition operations.

[0009] Preferably, a water tank is provided on one side of the rotary kiln body, a booster pump is provided on one side of the water tank, the booster pump is connected to the water tank through a suction pipe, the serpentine pipe is fixedly installed at the water outlet end of the booster pump, a delivery pipe is fixedly installed at the end of the serpentine pipe, a spiral pipe is fixedly installed at the end of the delivery pipe, the spiral pipe is located in the air inlet pipe, a return pipe is fixedly installed at the end of the spiral pipe, and the end of the return pipe is fixedly installed on the water tank, so as to facilitate the use of the serpentine pipe for heat exchange operation, and the hot water after heat exchange is transported to the spiral pipe position, so as to realize the preheating operation of the air entering from the air inlet pipe and achieve the effect of heat energy recovery and utilization.

[0010] Preferably, the spiral tube is spiral-shaped to increase the heat exchange area.

[0011] Preferably, a dust cover is hingedly connected to the top surface of the water tank, and the dust cover is closed for dust protection operation.

[0012] Preferably, a cleaning pipe is fixedly installed on the tank body at the bottom of the water tank, and a second valve is fixedly installed on the cleaning pipe to facilitate cleaning of the water tank, and the cleaned waste water can be discharged outward along the cleaning pipe.

[0013] Preferably, the serpentine tube is located at half the height of the gas outlet hood, and is used to add treatment liquid into the gas outlet hood to perform a reaction treatment operation on impurities on the surface of the serpentine tube.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model is provided with a waste heat utilization device to ensure that when in use, the three-way valve is turned to connect the air outlet hood with the sewage pipe, and then the first valve is closed. At this time, water is added into the air outlet hood to treat the liquid medicine, and the liquid medicine is used to react with the impurities on the serpentine tube to remove the impurities on the serpentine tube. The removed waste water can be discharged from the sewage pipe after opening the first valve, so as to clean the impurities on the serpentine tube and improve the heat exchange efficiency of the serpentine tube.

[0016] 2. The utility model sets up a waste heat utilization device to ensure that when in use, the discharged exhaust gas can be heat exchanged by water passing through the serpentine pipe, and the hot water after heat exchange is transported to the intake pipe to preheat the incoming air, thereby achieving the effect of heat energy recovery and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the waste heat utilization device of the utility model;

[0019] Figure 3 This is one of the partial structural schematic diagrams of the waste heat utilization device of the utility model;

[0020] Figure 4 This is the second partial structural schematic diagram of the utility model.

[0021] The meaning of each number in the figure is:

[0022] 1. Rotary kiln body; 10. Tail gas pipe; 11. Intake pipe;

[0023] 2. Waste heat utilization device; 20. Three-way pipe; 21. Three-way valve; 22. Drain pipe; 221. First valve; 23. Air outlet hood; 24. Top cover; 241. Exhaust pipe; 25. Water storage tank; 251. Dust cover; 252. Cleaning pipe; 253. Second valve; 26. Booster pump; 27. Suction pipe; 271. Serpentine pipe; 272. Delivery pipe; 28. Spiral pipe; 29. ​​Reflux pipe. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 4The utility model provides a technical solution: a sulfuric acid process titanium dioxide rotary kiln tail gas waste heat utilization device, comprising a rotary kiln body 1, a tail gas pipe 10 arranged on the rotary kiln body 1 and an air inlet pipe 11 arranged at the end of the rotary kiln body 1, the rotary kiln body 1 is provided with a waste heat utilization device 2, the waste heat utilization device 2 comprises a three-way pipe 20, a three-way valve 21 is fixedly installed on the three-way pipe 20, one of the tube bodies of the three-way pipe 20 is fixedly installed on the tail gas pipe 10, a sewage pipe 22 is fixedly installed on the other tube body of the three-way pipe 20, a first valve 221 is fixedly installed on the sewage pipe 22, and an air outlet hood 23 arranged vertically upward is fixedly installed on the remaining tube body of the three-way pipe 20, a serpentine pipe 271 is arranged in the air outlet hood 23, and the serpentine pipe 271 is used for passing water for heat exchange operation, so as to facilitate the use of water passing in the serpentine pipe 271 to perform heat exchange operation with exhaust gas.

[0026] In this embodiment, a top cover 24 is fixedly mounted on the top surface of the gas outlet cover 23 , and an exhaust pipe 241 is fixedly mounted on the top cover 24 . The exhaust pipe 241 is used for exhaust operation.

[0027] Specifically, a water tank 25 is provided on one side of the rotary kiln body 1, and a booster pump 26 is provided on one side of the water tank 25. The booster pump 26 is connected to the water tank 25 through a suction pipe 27. A serpentine tube 271 is fixedly installed at the water outlet of the booster pump 26. A delivery pipe 272 is fixedly installed at the end of the serpentine tube 271, and a spiral tube 28 is fixedly installed at the end of the delivery pipe 272. The spiral tube 28 is located in the air intake pipe 11, and a return pipe 29 is fixedly installed at the end of the spiral tube 28. The end of the return pipe 29 is fixedly installed on the water tank 25, so that the serpentine tube 271 is used for heat exchange operation, and the hot water after heat exchange is transported to the spiral tube 28 to realize the preheating operation of the air entering from the air intake pipe 11, so as to achieve the effect of heat energy recovery and utilization; the spiral tube 28 is spiral and used to increase the heat exchange area.

[0028] Furthermore, a dust cover 251 is hinged on the top surface of the water storage tank 25 via a hinge, and the dust cover 251 is closed for dust protection operation.

[0029] In addition, a cleaning pipe 252 is fixedly installed on the box body at the bottom position of the water tank 25, and a second valve 253 is fixedly installed on the cleaning pipe 252, which is convenient for cleaning the water tank 25, and the cleaned waste water can be discharged outward along the cleaning pipe 252.

[0030] It is worth noting that the serpentine tube 271 is located at half the height of the gas outlet hood 23, and is used to add treatment liquid into the gas outlet hood 23 to react and treat impurities on the surface of the serpentine tube 271. The sewage pipe 22 is used for sewage discharge operations, and the exhaust pipe 241 is used for adding reagents.

[0031] When the sulfuric acid process titanium dioxide rotary kiln tail gas waste heat utilization device of the utility model is used, the three-way valve 21 is rotated until the tail gas pipe 10 is connected to the gas outlet hood 23, the booster pump 26 is connected to the external power supply and made to work, and as the tail gas is discharged from the gas outlet hood 23, the booster pump 26 works to realize the cold water in the water storage tank 25 to be transported to the serpentine pipe 271, so as to realize the heat recovery and utilization operation of the exhaust gas, and the hot water after heat exchange is transported from the serpentine pipe 271 to the spiral pipe 28, so as to preheat the air entering from the air inlet pipe 11, so as to realize the heat recovery and utilization operation, and the water in the spiral pipe 28 after heat exchange can continue to flow back to the water storage tank 25;

[0032] When it is necessary to clean the serpentine tube 271, close the first valve 221, turn the three-way valve 21 until the sewage pipe 22 is connected to the gas outlet hood 23, and then add water and reaction liquid into the gas outlet hood 23, and use the liquid to react with the impurities on the serpentine tube 271 to remove the impurities. Subsequently, open the first valve 221 to discharge the waste water and impurities in the gas outlet hood 23 to the outside, thereby completing the cleaning operation of the impurities on the serpentine tube 271.

[0033] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A device for utilizing waste heat from tail gas of a titanium dioxide rotary kiln produced by a sulfuric acid process, comprising a rotary kiln body (1), a tail gas pipe (10) arranged on the rotary kiln body (1), and an air inlet pipe (11) arranged at the end of the rotary kiln body (1), characterized in that: The rotary kiln body (1) is provided with a waste heat utilization device (2), the waste heat utilization device (2) comprising a three-way pipe (20), a three-way valve (21) fixedly mounted on the three-way pipe (20), one of the pipe bodies of the three-way pipe (20) fixedly mounted on the tail gas pipe (10), a sewage pipe (22) fixedly mounted on the other pipe body of the three-way pipe (20), a first valve (221) fixedly mounted on the sewage pipe (22), and a gas outlet hood (23) vertically arranged upwards fixedly mounted on the remaining pipe body of the three-way pipe (20), a serpentine pipe (271) arranged inside the gas outlet hood (23), and the serpentine pipe (271) is used for passing water to perform heat exchange operations.

2. The device for utilizing waste heat from tail gas of titanium dioxide rotary kiln produced by sulfuric acid process according to claim 1, characterized in that: A top cover (24) is fixedly mounted on the top surface of the gas outlet hood (23), and an exhaust pipe (241) is fixedly mounted on the top cover (24), wherein the exhaust pipe (241) is used for exhaust operation.

3. The device for utilizing waste heat from tail gas of titanium dioxide rotary kiln produced by sulfuric acid process according to claim 2, characterized in that: The sewage discharge pipe (22) is used for sewage discharge operations, and the exhaust pipe (241) is used for the operation of adding medicines.

4. The device for utilizing waste heat from tail gas of titanium dioxide rotary kiln produced by sulfuric acid process according to claim 1, characterized in that: A water storage tank (25) is arranged on one side of the rotary kiln body (1), and a booster pump (26) is arranged on one side of the water storage tank (25). The booster pump (26) and the water storage tank (25) are connected via a suction pipe (27). The serpentine pipe (271) is fixedly mounted on the water outlet end of the booster pump (26). A delivery pipe (272) is fixedly mounted on the end of the serpentine pipe (271), and a spiral pipe (28) is fixedly mounted on the end of the delivery pipe (272). The spiral pipe (28) is located in the air inlet pipe (11). A return pipe (29) is fixedly mounted on the end of the spiral pipe (28), and the end of the return pipe (29) is fixedly mounted on the water storage tank (25).

5. The device for utilizing waste heat from tail gas of titanium dioxide rotary kiln produced by sulfuric acid process according to claim 4, characterized in that: The spiral tube (28) is spiral-shaped and is used to increase the heat exchange area.

6. The device for utilizing waste heat from tail gas of titanium dioxide rotary kiln produced by sulfuric acid process according to claim 5, characterized in that: A dust cover (251) is hingedly connected to the top surface of the water storage tank (25) via a hinge, and the dust cover (251) is closed for dust protection operation.

7. The device for utilizing waste heat from tail gas of titanium dioxide rotary kiln produced by sulfuric acid process according to claim 5, characterized in that: A cleaning pipe (252) is fixedly mounted on the tank body at the bottom of the water storage tank (25), and a second valve (253) is fixedly mounted on the cleaning pipe (252).

8. The device for utilizing waste heat from tail gas of titanium dioxide rotary kiln produced by sulfuric acid process according to claim 1, characterized in that: The serpentine tube (271) is located at half the height of the gas outlet hood (23) and is used to add treatment liquid into the gas outlet hood (23) to perform a reaction treatment operation on impurities on the surface of the serpentine tube (271).

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