Reboiler of organic silicon synthesis washing tower
By adopting the external half-tube and internal tube bundle structure in the reboiler of the organic silicon synthesis washing tower, the problem of insufficient heat exchange area is solved, efficient heat exchange and convenient cleaning are achieved, and equipment investment and operating costs are reduced.
Patent Information
- Application Number
- CN202422636178.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-10-30
AI Technical Summary
The heat exchange area of the existing organosilicon synthesis scrubber reboiler is limited, resulting in poor heat exchange effect and inconvenient cleaning when the device is scaled up.
The external half-tube and internal tube bundle structure are used to increase the heat exchange area, and the double-layer paddle agitator is used to achieve uniform distribution of the silicon slurry and convenient cleaning.
It improves heat exchange efficiency, avoids silicon powder deposition, simplifies maintenance and cleaning processes, and reduces equipment investment and operating costs.
Smart Images
Figure CN223366539U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a reboiler for an organosilicon synthesis washing tower, belonging to the technical field of organosilicon production. Background Art
[0002] In recent decades, the production process of organosilicon monomers has been continuously improved and optimized, leading to gradual increases in production efficiency and product quality. Meanwhile, organosilicon technology has primarily focused on product applications. By introducing different organic groups, modifying polymer structures, and adopting cross-linking techniques, a variety of organosilicon products with specialized properties and functions have been developed, including silicone fluids, silicone rubbers, silicone resins, and silane coupling agents. These products are widely used in a wide range of fields, including aerospace, electronics, construction, automotive, medical, and daily chemicals.
[0003] The main raw materials for organosilicon synthesis are silicon blocks and methyl chloride. Industrial silicon powder is produced by reducing quartz with coke in an electric arc furnace. Methanol reacts with hydrogen chloride to produce methyl chloride, which is used as a raw material in organosilicon production. The reaction process involves reacting silicon powder and methyl chloride in a fluidized bed reactor at high temperature (280-300°C) and high pressure (0.2 MPa) in the presence of a catalyst (such as copper powder). The resulting methylchlorosilanes are a mixture, primarily consisting of monomethyltrichlorosilane, dimethyldichlorosilane, and trimethylmonochlorosilane. Byproducts such as high-boiling substances, silicon tetrachloride, and hydrogen-containing monomers are also produced.
[0004] The syngas exiting the fluidized bed contains organosilicon monomer, unreacted methyl chloride, and unreacted silicon powder. The syngas first passes through a cyclone separator to remove most of the silicon powder. A small amount of fine silicon powder is carried to a scrubber where it is wet-dusted by a monomer spray. The scrubber removes dust and separates high-boiling products. Silicon powder, high-boiling products, and some organosilicon monomer flow through an overflow port at the bottom of the scrubber into the scrubber reboiler. The reboiler heats the monomer and provides some heat for the scrubber kettle. The traditional scrubber boiler is a vertical conical-bottom structure with a welded half-tube outside the shell. Heat transfer oil flows through the tube to provide heat for the material. Internal agitation prevents silicon powder deposition and ensures uniform heating of the material. This structure can provide a certain amount of heat for the operation of the scrubber, and stirring can also prevent silicon powder from depositing. The silicon slurry can be discharged smoothly from the bottom of the reboiler, but the heating area is limited. Especially for large-scale silicone production, the heat exchange area cannot be increased proportionally, the evaporation capacity of the reboiler is limited, and the heating effect is not ideal. The discharged slurry contains a large amount of silicone monomer. In addition, if the silicon powder is deposited in the reboiler, it is difficult to clean it. Summary of the Invention
[0005] The utility model develops a new type of organic silicon scrubber reboiler, which solves the technical problem of limited heat exchange area of the existing reboiler and inability to meet production requirements when the device is scaled up. It also overcomes the problem of inconvenience in internal maintenance and cleaning in the existing technology.
[0006] The reboiler of the organic silicon synthesis washing tower includes a cylinder, a cone, a tube bundle 1, and a tube bundle 2;
[0007] The cylinder is connected to the cone; tube bundle 1 and tube bundle 2 are arranged at symmetrical positions on the lower part of the cylinder, and the tube bundle 1 and tube bundle 2 respectively penetrate into the cylinder and are arranged in parallel and symmetrically in the cylinder.
[0008] The distance between tube bundle 1 and tube bundle 2 is 1 / 2-3 / 4 times the diameter D of the reboiler shell; the length of the tube bundle extending into the shell is L=3 / 5~3 / 4D; the diameter of the tube bundle is d=300~600mm.
[0009] Both tube bundle 1 and tube bundle 2 are multiple U-shaped tubes arranged in parallel, with a diameter of 10-30 mm; heat medium is introduced into the U-shaped tubes to achieve heating.
[0010] The height-to-diameter ratio of the cylinder is 2~4; the cone angle of the cone part is 60-90 degrees. A head is provided on the cylinder, and a double-layer paddle agitator is provided under the head. The number of paddle blades is 2 or 3, one layer of paddle blades is provided below the tube bundle, and the other layer of paddle blades is provided above the tube bundle.
[0011] A half pipe is welded to the outside of the cylinder and cone. The diameter of the half pipe is 100~150mm and it is spiral-shaped.
[0012] The reboiler is provided with a washing tower liquid phase inlet, a material gas phase outlet, a silicon slurry discharge port, a temperature port, a liquid level port, a manhole, etc., and is specially provided with a cleaning agent inlet and discharge port.
[0013] Technical advantages:
[0014] 1. The reboiler of the utility model adopts external half-tubes and internal tube bundles for heat exchange, which increases the heat exchange area per unit volume. This overcomes the problem in the prior art that the heat exchange effect of the reboiler is poor as the production capacity increases, and the technical problem that the heat exchange area of the reboiler cannot be increased proportionally as the production capacity scale increases.
[0015] 2. Under the condition of processing the same production capacity, the equipment is smaller in size, saving structural investment.
[0016] 3. While improving the heat exchange efficiency, the silicon slurry can be evenly distributed and not easily deposited, and the silicon slurry can be discharged smoothly.
[0017] 4. This structure is both safe and convenient. When inspecting the reboiler, agitator shaft, or agitator paddle, the material can be drained, cleaned and replaced with cleaning agents, and the tube bundle can be pulled out for easy maintenance and internal inspection. The tube bundle structure is easy to clean. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is the front view of the reboiler of the silicone scrubber.
[0019] Figure 2 This is a top view of the reboiler of the silicone scrubber.
[0020] Among them, 1. Cylinder; 2. Cone; 3. Head; 4. Double-layer paddle agitator; 5. Tube bundle 1; 6. Tube bundle 2; 7. Tube sheet; 8. Half tube; 9. Manhole. DETAILED DESCRIPTION
[0021] Example 1
[0022] The reboiler of the scrubber of a 150,000 t / a organosilicon synthesis unit includes a cylinder, a cone, an upper head, a stirring mechanism, two symmetrical tube bundles and tube sheets, welded half-tubes on the outside of the cylinder and cone, a manhole above the head, and necessary process and instrument ports as well as cleaning agent inlets and outlets.
[0023] The cylinder 1 is connected to the cone 2; tube bundle 1 5 and tube bundle 2 6 are provided at symmetrical positions on the lower part of the cylinder 1. Tube bundle 1 5 and tube bundle 2 6 are respectively extended into the cylinder 1 and are arranged in parallel and symmetrically in the cylinder 1.
[0024] The reboiler has a diameter of D = 2.4 meters, and the overall height from the tangent line of the upper head to the conical bottom pipe mouth is about 5 meters; the cone angle is 90 degrees. Two tube bundles are symmetrically distributed on the side of the cylinder, with a tube bundle diameter of d = 400mm and a spacing of m = 1200mm. The U-shaped tube has a diameter of 25mm and a length of 1.4 meters. Each tube bundle has 35 U-shaped tubes arranged in a square shape with a tube spacing of 25mm to facilitate cleaning of the tube bundle. The total heat exchange area of the tube bundle is about 15㎡. The heat exchanger cylinder and the outside of the cone are welded with half-tubes with a diameter of 100mm, and the total heat exchange area of the half-tubes is 15m 2 The reboiler has a diameter of D = 2.4 meters, and the overall height from the tangent line of the upper head to the conical bottom tube mouth is about 5 meters; the cone angle is 90 degrees. Two tube bundles are symmetrically distributed on the side of the cylinder, with a tube bundle diameter of d = 400mm and a spacing of m = 1200mm. The U-shaped tube has a diameter of 25mm and a length of 1.4 meters. Each tube bundle has 35 U-shaped tubes arranged in a square shape with a spacing of 25mm to facilitate cleaning of the tube bundle. The total heat exchange area of the tube bundle is about 15 m 2 A half-tube with a diameter of 100mm is welded to the outside of the heat exchanger cylinder and cone, and the heat exchange area of the half-tube is 15㎡ in total. The stirring is set in the center of the head 3, and a double-layer paddle agitator is used. There are 3 paddle blades, one layer of which is set below the tube bundle, and the other layer of paddle blades is set above the tube bundle, forming an axial flow in the reboiler. The reboiler is equipped with a washing tower liquid phase inlet, a material gas phase outlet, a silicon slurry discharge port, a temperature port, a liquid level port, a manhole, etc., and a cleaning agent inlet and discharge port are specially set to facilitate the deactivation, cleaning and replacement of materials during shutdown and maintenance.
[0025] If the existing washing tower reboiler with only outer half-tube heating is used to obtain the same heat exchange area, the reboiler diameter needs to be 3 meters and the total height of the reboiler is about 7 meters. This obviously increases the investment in the device, and the heat exchange efficiency is poor because it only relies on the outer wall. The internal materials rely entirely on stirring to obtain heat exchange.
Claims
1. Organic silicon synthesis washing tower reboiler, characterized in that, It includes a cylinder (1), a cone (2), a tube bundle 1 (5), and a tube bundle 2 (6); The cylinder (1) is connected to the cone (2); A tube bundle 1 (5) and a tube bundle 2 (6) are provided at symmetrical positions on the lower part of the cylinder (1). The tube bundle 1 (5) and the tube bundle 2 (6) respectively penetrate into the cylinder (1) and are arranged in parallel and symmetrically within the cylinder (1).
2. The organosilicon synthesis washing tower reboiler according to claim 1, characterized in that: The distance between tube bundle 1 (5) and tube bundle 2 (6) is 1 / 2-3 / 4 times the diameter D of the reboiler shell; the length of the tube bundle extending into the shell (1) is L=3 / 5~3 / 4D; the diameter of the tube bundle is d=300~600mm.
3. The organosilicon synthesis washing tower reboiler according to claim 1, characterized in that: Both tube bundle 1 (5) and tube bundle 2 (6) are multiple U-shaped tubes arranged in parallel, with the spacing between the U-shaped tubes being 10-30 mm; heating is achieved by passing heat medium into the U-shaped tubes.
4. The organosilicon synthesis washing tower reboiler according to claim 1, characterized in that: The height-to-diameter ratio of the cylinder (1) is 2-4; the cone angle of the cone (2) is 60-90 degrees; a head (3) is provided on the cylinder (1); a double-layer paddle agitator (4) is provided under the head (3), wherein one layer of paddles is provided below the tube bundle, and the other layer of paddles is provided above the tube bundle.
5. The organosilicon synthesis washing tower reboiler according to claim 1, characterized in that: A half pipe is welded on the outside of the cylinder (1) and the cone (2), and the diameter of the half pipe is 100-150 mm and is spiral-shaped.