Furnace gas quenching pipeline of fluidizing chlorination furnace

Abstract

The utility model relates to a boiling chlorination furnace gas quenching pipeline which comprises a connecting flange, a steel body shell, a castable and a neck bush pipe, high-temperature furnace gas is arranged in the quenching pipeline and flows in the neck bush pipe at a high speed, the castable is arranged outside the neck bush pipe, and the neck bush pipe and the steel body shell are connected together through the castable. An anchoring part is welded in the steel body shell, connecting flanges are welded to the two ends of the steel body shell, a lifting lug is welded to the outer surface of the steel body shell, and a reinforcing plate is attached between the lifting lug and the steel body shell. The neck bush pipe is arranged, so that the smoothness of the inner wall of the quenching pipeline is improved, and the phenomenon that high-boiling-point impurities in furnace gas are continuously bonded in the cooling pipeline, and consequently the cooling pipeline is blocked can be avoided or greatly relieved. And meanwhile, the castable with low water content and higher acid resistance is adopted, so that the service life of the quenching pipeline is greatly prolonged, and a powerful guarantee is provided for stable production of the chlorination furnace.

Description

Technical Field

[0001] This invention relates to the field of fluidized bed chlorination for the production of titanium tetrachloride, specifically to a quench pipe for the furnace gas of a fluidized bed chlorination furnace. Background Technology

[0002] Titanium tetrachloride is an important intermediate raw material for the production of sponge titanium and its alloys. Currently, its production processes include fluidized bed chlorination (fluidized bed chlorination) and molten salt chlorination. Among these, fluidized bed chlorination is the main method for producing titanium tetrachloride. It uses chlorine gas as the gaseous phase and a mixture of titanium slag and petroleum coke as the solid phase, with the reaction taking place in a gas-solid two-phase system. Compared with other production processes, fluidized bed chlorination has many advantages, such as low cost, high utilization of raw materials and equipment, and high heat exchange efficiency. Therefore, it is widely used in the production of titanium tetrachloride both domestically and internationally. The temperature of fluidized bed chlorination is generally controlled between 950 and 1000℃. Therefore, the temperature of the furnace gas at the chlorination furnace outlet is also as high as 950℃ or more. Furthermore, the composition of the furnace gas is very complex, containing chlorine, titanium tetrachloride, hydrogen chloride, etc., which is not only corrosive but also contains many solid impurities such as titanium dioxide, petroleum coke, ferric chloride, and manganese chloride. This mixed furnace gas has a strong scouring and corrosive effect on the chlorination furnace outlet pipe. Therefore, the chlorination furnace outlet pipe needs to be resistant to high temperature, corrosion, and scouring simultaneously.

[0003] Currently, carbon steel lined with mullite castable is used for the cooling pipes of chlorination furnace gas. This type of quench pipe is prone to detachment of the lining layer under high temperature, strong corrosion and strong scouring conditions, resulting in a short service life. Moreover, due to its rough inner surface, it is easy for impurities such as ferric chloride and manganese chloride to adhere, causing blockage of the quench pipe and forcing the chlorination furnace to shut down. When the high temperature furnace gas is cooled in the inner lining sleeve, the furnace gas passes through at a relatively fast speed, which may result in insufficient cooling of the furnace gas. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: The present invention relates to a quench pipe for flue gas in a boiling chlorination furnace, comprising: a flange, a steel outer shell, a castable refractory, and an inner lining sleeve. The quench pipe contains high-temperature furnace gas, which flows within the inner lining sleeve. The outer surface of the inner lining sleeve is made of castable refractory, which connects the inner lining sleeve and the steel outer shell together. Anchors are welded inside the steel outer shell, connecting flanges are welded at both ends of the steel outer shell, and lifting lugs are welded to the outer surface of the steel outer shell.

[0005] Preferably, the quench pipe is connected by a flange, the flange connection method is SO, the flange is welded to the steel shell, and the length of the quench pipe is no more than 2 meters.

[0006] Preferably, the steel outer shell, connecting flange, and lifting lugs are made of S30408 ​​steel.

[0007] Preferably, the castable material is a phosphate castable, and the inner lining sleeve has a segmented structure with concave and convex surfaces at both ends for connection.

[0008] Preferably, the inner liner is made of silicon nitride, with an inner wall roughness of no more than 25 and a liner thickness of no less than 30 mm.

[0009] Preferably, the inner lining sleeve and the castable refractory are 5 mm shorter than the flange sealing surface in axial length.

[0010] Preferably, annular rock wool is added between the flanges of the quench pipe for buffering.

[0011] Preferably, U-shaped lifting lugs are provided at both ends of the quench pipe, and reinforcing plates are welded between the lifting lugs and the steel outer shell.

[0012] Preferably, the anchor has a V-shaped structure, and the V-shaped surfaces of two adjacent rows of anchors are at 90°.

[0013] Preferably, the anchor material is S30408.

[0014] Preferably, the inner liner sleeve has a groove inside, a rotating shaft is fixedly connected inside the groove, and an interference plate is rotatably connected to the outer wall of the rotating shaft.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] The quenching pipe, steel shell, connecting flanges and anchors are all made of S30408 ​​material, which enhances the heat resistance of the quenching pipe, reduces the overall coefficient of thermal expansion, extends the service life, and is also less expensive than 316L and nickel-based alloy materials.

[0017] 2. The castable refractory has been changed to phosphate castable refractory, which has stronger temperature resistance, corrosion resistance and erosion resistance, and extends the service life of the pipe cooling pipeline.

[0018] 3. Adding an inner lining sleeve further enhances temperature resistance, corrosion resistance, and erosion resistance. Because the inner wall of the lining pipe is smooth, it can reduce the erosion of the inner wall by the furnace gas and prevent impurities such as ferric chloride from accumulating on the inner wall of the pipe and clogging the quench pipe.

[0019] 4. Adding rock wool to the flange connection of the quench pipe can buffer and seal the pipe during thermal expansion and contraction.

[0020] 5. When the high-temperature furnace gas passes through the inner lining sleeve, the angle of the pre-adjusted interference plate makes the flow path of the high-temperature furnace gas tortuous and complex, so that it can exchange heat more fully and improve the cooling efficiency and cooling effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a quench pipe for the furnace gas of a fluidized bed chlorination furnace according to the present invention;

[0022] Figure 2 This is a three-dimensional internal structure cross-sectional view of the gas quenching pipe of a fluidized bed chlorination furnace according to the present invention.

[0023] Figure 3 This is a schematic diagram of the groove structure opened in the inner liner sleeve in this invention;

[0024] Figure 4 This is a schematic diagram of the connection structure between the rotating shaft and the interference plate in this invention.

[0025] In the diagram: 1. Connecting flange; 2. Steel shell; 3. Castable refractory; 4. Inner lining sleeve; 5. Anchor; 6. Lifting lug; 7. Quenching pipe; 8. Reinforcing plate; 9. Rock wool; 10. Groove; 11. Shaft; 12. Interference plate. Detailed Implementation

[0026] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] Please see Figure 1 , Figure 2 and Figure 3 The present invention provides a technical solution: a quench pipe for flue gas in a boiling chlorination furnace, comprising: a connecting flange 1, a steel outer shell 2, a castable refractory 3, an inner lining sleeve 4, an anchor 5, a lifting lug 6, a quench pipe 7, a reinforcing plate 8, rock wool 9, a groove 10, a rotating shaft 11, and an interference plate 12.

[0028] The quench pipe 7 contains high-temperature furnace gas, which flows rapidly within the inner lining sleeve 4. Because the inner lining sleeve 4 is made of silicon nitride with a smooth inner wall, the gas experiences low resistance during flow, and particles are less likely to adhere to or accumulate on the wall, preventing blockage of the quench pipe 7. Simultaneously, the inner lining sleeve 4 possesses excellent temperature resistance, corrosion resistance, and wear resistance, increasing the service life of the quench pipe 7. The outer surface of the inner lining sleeve 4 is filled with castable refractory 3, which connects the inner lining sleeve 4 to the steel outer shell 2. V-shaped anchors 5 are welded to the inner wall of the steel outer shell 2, arranged in a ring. Adjacent rows of anchors 5 are staggered, and the V-shaped surfaces are at 90°, increasing the axial and radial stress area. The anchors 5 are embedded within the castable refractory 3, making the connection between the castable refractory 3 and the steel outer shell 2 tighter and less prone to detachment. The steel outer shell 2 is welded with reinforcing plates 8 and lifting lugs 6. The lifting lugs 6 are distributed at both ends of the quench pipe 7 for easy installation and maintenance. The steel outer shell 2 is provided with connecting flanges 1 at both ends. The connecting flanges 1 and the steel outer shell 2 are welded together. The weld joints inside the connecting flanges 1 are also welded, which increases the structural strength. At the same time, it prevents the furnace gas from forming eddies in the gap between the connecting flanges 1 and the steel outer shell 2, which would wear the weld joints through. The inner lining sleeve 4 has a groove 10 inside. A rotating shaft 11 is fixedly connected inside the groove 10. An interference plate 12 is rotatably connected to the outer wall of the rotating shaft 11.

[0029] The axial length of the castable refractory 3 and the inner lining sleeve 4 should be 5mm shorter than the sealing surface of the connecting flange 1 to allow space for thermal expansion and contraction of the castable refractory 3, so as to prevent the quench pipes 7 at both ends from bursting due to thermal expansion. At the same time, the connecting flange 1 of the quench pipes 7 at both ends is reinforced with annular rock wool 9 to provide a buffer.

[0030] Phosphate-based castable 3 is selected. Phosphate-based castable 3 requires less water during construction, and the resulting inner lining layer has low porosity, high density, and high strength. Combined with the protection of the inner lining sleeve 4, it greatly improves the service life of the quenching pipe 7 and provides a guarantee for the stable production of the chlorination furnace.

[0031] The interference plate 12 is made of the same material as the inner lining sleeve 4, which makes its surface more resistant to temperature, corrosion and erosion, so that impurities will not remain on the interference plate 12. The interference plate 12 interferes with the flow path of the furnace gas, resulting in higher cooling efficiency and better effect. By rotating the interference plate 12 on the outer wall of the rotating shaft 11, the angle of the interference plate 12 can be adjusted according to different situations to achieve different interference effects.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A quench pipe for furnace gas in a fluidized bed chlorination furnace, comprising: The components are: connecting flange (1), steel shell (2), castable refractory (3), inner lining sleeve (4), anchor (5), lifting lug (6), quench pipe (7), reinforcing plate (8), and rock wool (9). The quench pipe (7) contains high-temperature furnace gas, which flows rapidly inside the inner lining sleeve (4). The outer side of the inner lining sleeve (4) is castable refractory (3), which connects the inner lining sleeve (4) and the steel shell (2). The inner wall of the steel shell (2) is welded with anchor (5). The two ends of the steel shell (2) are equipped with connecting flange (1), and the outer side is welded with reinforcing plate (8). The reinforcing plate (8) is connected to the lifting lug (6).

2. The quench pipe for boiler gas in a fluidized bed chlorination furnace according to claim 1, characterized in that: The steel shell (2) is equipped with connecting flanges (1) at both ends and has lifting lugs (6) welded to the outer wall. The steel shell (2) has anchors (5) welded to the inner wall. The castable material (3) connects the steel shell (2) and the inner lining sleeve (4) together.

3. The quench pipe for boiler gas in a fluidized bed chlorination furnace according to claim 2, characterized in that: The anchor (5) is V-shaped, welded to the inner wall of the steel shell (2), and distributed in a ring on the inner wall of the steel shell (2). The adjacent rows of anchors (5) are staggered, and the V-shaped surface is 90°.

4. The quench pipe for boiler gas in a fluidized bed chlorination furnace according to claim 1, characterized in that: The steel shell (2) has a reinforcing plate (8) on the outside, and a U-shaped lifting lug (6) on the outside of the reinforcing plate (8). The steel shell (2), the reinforcing plate (8) and the U-shaped lifting lug (6) are welded together as an integrated structure, and the steel shell (2) and the connecting flange (1) are welded together as an integrated structure.

5. The quench pipe for flue gas in a boiling chlorination furnace according to claim 1, characterized in that: The inner lining sleeve (4) is fixed together with the steel outer shell (2) by the castable material (3). The inner lining sleeve (4) and the castable material (3) are of equal length in the axial direction, and both ends are shorter than the sealing surface of the connecting flange (1).

6. The quench pipe for boiler gas in a fluidized bed chlorination furnace according to claim 5, characterized in that: The inner liner sleeve (4) has a segmented structure, with each segment connected and positioned by concave and convex surfaces.

7. The quench pipe for boiler gas in a fluidized bed chlorination furnace according to claim 1, characterized in that: The inner liner sleeve (4) has a groove (10) inside, and a rotating shaft (11) is fixedly connected inside the groove (10). An interference plate (12) is rotatably connected to the outer wall of the rotating shaft (11).

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