Water collecting pipe of polycrystalline silicon tail gas recovery adsorption column

Abstract

The utility model belongs to the technical field of tail gas recovery, and provides a water collecting pipe of a polycrystalline silicon tail gas recovery adsorption column, which comprises a water inlet collecting pipe provided with a plurality of circles of water inlet elbows respectively communicated with the bottom of the adsorption column and used for distributing the water inlet quantity of the adsorption column; the water outlet manifold is provided with a plurality of circles of water outlet elbows which are respectively communicated with the bottoms of the adsorption columns and is used for distributing the water outlet quantity of the adsorption columns; wherein the water outlet bent pipe is higher than the water inlet bent pipe, the water inlet bent pipe on the outermost ring layer is provided with at least one more water inlet than the water inlet bent pipes on the other ring layers, and the water outlet bent pipe on the outermost ring layer is provided with at least one more water outlet than the water outlet bent pipes on the other ring layers. According to the utility model, through the water inlets and the water outlets in the outermost layer, the quantity of water entering the water inlet elbow and the water outlet elbow of each layer can be uniformly distributed, so that bias flow and non-uniform heat exchange are avoided, the energy consumption of the adsorption column is reduced, and the tail gas treatment efficiency of the adsorption column is improved.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas recovery technology, specifically to a water collection pipe for a polycrystalline silicon exhaust gas recovery adsorption column. Background Technology

[0002] The recovery of exhaust gas in the polysilicon production process is usually achieved by using an adsorption column water system. The heat exchange performance of the adsorption column directly affects the equipment heating efficiency and energy consumption control.

[0003] Currently, existing adsorption columns use water collection pipes for water distribution. These pipes transfer heat through multiple parallel-connected finned heat exchange tubes. The specific technical principle is that cooling water exchanges heat with the external exhaust gas as it flows through the finned heat exchange tubes, ensuring temperature uniformity across the coils by rationally distributing the water volume. However, existing water collection pipes have the following problems:

[0004] 1. Imbalance in water distribution between inner and outer heat exchange tubes, resulting in severe flow deviation. Although the inner and outer heat exchange tubes have the same diameter, their resistance distribution is uneven. Water will preferentially flow to the inner heat exchange tubes with lower resistance, while the outer heat exchange tubes will have insufficient water distribution, resulting in local heat exchange temperature differences of up to 15-20℃. If the diameter of the inner heat exchange tubes is reduced to increase its resistance, it will easily lead to the risk of pipe blockage.

[0005] 2. Uneven heat exchange between the inner and outer heat exchange tubes affects the adsorption column's treatment of exhaust gas. Imbalance in water distribution between the inner and outer heat exchange tubes directly causes localized lag in heat exchange tube heating, resulting in uneven heat exchange. This leads to a 20%–30% increase in energy consumption of the adsorption column and a decrease in exhaust gas treatment efficiency. If an asymmetric pipe layout is used, it is further limited by the spatial structure of the adsorption column, making it difficult to achieve synchronous balance of water flow across multiple heat exchange tubes. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a water collection pipe for a polycrystalline silicon tail gas recovery adsorption column, thereby solving the problems of unbalanced water distribution and uneven heat exchange in the inner and outer heat exchange tubes of existing water collection pipes.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A water collection pipe for a polycrystalline silicon tail gas recovery adsorption column includes:

[0009] The inlet manifold has multiple inlet bends connected to the bottom of the adsorption column, used to distribute the inlet water volume of the adsorption column; and

[0010] The water outlet manifold has multiple turns of water outlet bends that are respectively connected to the bottom of the adsorption column, which are used to distribute the water output of the adsorption column.

[0011] The water outlet bend is higher than the water inlet bend, the outermost water inlet bend has at least one more inlet than the other water inlet bends, and the outermost water outlet bend has at least one more outlet than the other water outlet bends.

[0012] In one embodiment disclosed in this application, the water inlet bends are arranged in four concentric rings at equal intervals. From the inside out, the first and second rings of water inlet bends each have one water inlet, the third ring of water inlet bends has two water inlets, and the fourth ring of water inlet bends has three water inlets.

[0013] The water outlet bends are arranged in four concentric rings at equal intervals. From the inside out, the first and second rings of water outlet bends each have one water outlet, the third ring has two water outlets, and the fourth ring has three water outlets.

[0014] In one embodiment disclosed in this application, each of the water inlets is connected to a main water inlet via a first water inlet branch pipe, and the main water inlet is located below the water inlet bend pipe and is used to introduce cooling water;

[0015] Each of the aforementioned outlets is connected to an outlet main pipe via a first outlet branch pipe. The outlet main pipe is located below and above the inlet bend pipe and is used to draw out cooling water.

[0016] In one embodiment disclosed in this application, the water inlet bend of each ring is connected to the bottom of the adsorption column through several upwardly extending second water inlet branch pipes;

[0017] Each concentric water outlet bend is connected to the bottom of the adsorption column via several upward-extending second water outlet branch pipes.

[0018] In one embodiment disclosed in this application, the inlet bend and outlet bend of the first ring are respectively connected to the bottom of the adsorption column through six circumferentially distributed second inlet branch pipes and second outlet branch pipes;

[0019] The inlet and outlet bends of the second ring are connected to the bottom of the adsorption column through 12 circumferentially distributed second inlet and outlet branch pipes, respectively.

[0020] The inlet and outlet bends of the third ring are connected to the bottom of the adsorption column through 18 circumferentially distributed second inlet and second outlet branch pipes.

[0021] The inlet and outlet bends of the fourth ring are connected to the bottom of the adsorption column through 24 spaced second inlet and outlet branch pipes, respectively.

[0022] In one embodiment disclosed in this application, both the inlet bend and the outlet bend are C-shaped structures with notches, and the notches face different or opposite directions;

[0023] The end of the inlet header that is away from the notch of the inlet bend is its inlet, and the end of the outlet header that is away from the notch of the outlet bend is its outlet.

[0024] In one embodiment disclosed in this application, the bending radius of the outermost inlet bend is greater than the bending radius of the outermost outlet bend.

[0025] The bending radius of the outermost water outlet bend is greater than that of the next outermost water inlet bend.

[0026] The bending radius of the inlet bend of the outermost ring is greater than that of the outlet bend of the outermost ring.

[0027] In one embodiment disclosed in this application, the bending radius of the fourth layer of the water inlet bend is 1400mm, the bending radius of the third layer of the water inlet bend is 1050mm, the bending radius of the second layer of the water inlet bend is 700mm, and the bending radius of the first layer of the water inlet bend is 350mm.

[0028] The bending radius of the fourth ring of the water outlet bend is 1545.5 mm, the bending radius of the third ring of the water outlet bend is 1195.5 mm, the bending radius of the second ring of the water outlet bend is 845.5 mm, and the bending radius of the first ring of the water outlet bend is 495.5 mm.

[0029] In one embodiment disclosed in this application, the diameters of the inlet bend and the outlet bend are equal;

[0030] The diameters of the first inlet branch pipe and the first outlet branch pipe are equal.

[0031] The diameters of the inlet header and the outlet header are equal.

[0032] The second inlet branch pipe and the second outlet branch pipe have the same diameter;

[0033] The diameters of the second inlet branch pipe, the first inlet branch pipe, the inlet bend pipe, and the inlet main pipe increase sequentially.

[0034] In one embodiment disclosed in this application, the inlet manifold and the outlet manifold are made of the same material, Q345D;

[0035] The inlet main pipe, the first inlet branch pipe, the inlet bend pipe and the second inlet branch pipe are sequentially welded and sealed together, and the outlet main pipe, the first outlet branch pipe, the outlet bend pipe and the second outlet branch pipe are sequentially welded and sealed together.

[0036] Compared with the prior art, the beneficial effects of this utility model are:

[0037] The additional inlet and outlet ports in the outermost layer allow for a more even distribution of water into the inlet and outlet bends of each layer, preventing uneven flow and heat exchange, thus reducing the energy consumption of the adsorption column and improving its tail gas treatment efficiency. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0040] Figure 2 This is a front view structural diagram of the present invention;

[0041] Figure 3 This is a lower view of the structure of this utility model;

[0042] Figure 4 This is a three-dimensional structural diagram of the water inlet manifold;

[0043] Figure 5 This is a three-dimensional structural diagram of the water outlet manifold. Detailed Implementation

[0044] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0050] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0051] See Figures 1-5 As shown, this utility model provides a water collection pipe for a polycrystalline silicon tail gas recovery adsorption column, comprising:

[0052] The inlet manifold 100 has multiple inlet bends 110 connected to the bottom of the adsorption column (not shown in the figure), used to distribute the inlet water volume of the adsorption column; and

[0053] The water outlet manifold 200 has multiple water outlet bends 210 that are connected to the bottom of the adsorption column (not shown in the figure) to distribute the water output of the adsorption column.

[0054] Among them, the outlet bend 210 is higher than the inlet bend 110 (i.e., located above the inlet bend 110), the outermost inlet bend 110 has at least one more inlet than the other inlet bends 110, and the outermost outlet bend 210 has at least one more outlet than the other outlet bends 210.

[0055] Specifically, the inlet bends 110 are arranged concentrically at equal intervals in four rings. From the inside out, the first and second rings of inlet bends 110 each have one inlet, the third ring has two inlets, and the fourth ring (the outermost ring) has three inlets. Similarly, the outlet bends 210 are arranged concentrically at equal intervals in four rings. From the inside out, the first and second rings of outlet bends 210 each have one outlet, the third ring has two outlets, and the fourth ring (the outermost ring) has three outlets. By using different numbers of inlets and outlets, the effects of uneven resistance distribution between the inner and outer rings can be eliminated, ensuring a reasonable distribution of water entering each ring of inlet bends 110 and outlet bends 210. Verification showed that the uniformity of water distribution in the inner and outer ring inlet bends 110 and outlet bends 210 was improved to over 95%, the heat exchange temperature difference between the inner and outer rings was ≤5℃, the overall energy consumption of the adsorption column was reduced by 18%–25%, and the tail gas treatment efficiency was increased by 12%–15%. In other words, the additional inlet and outlet in the outermost ring allows for a more even distribution of water into each ring's inlet bend 110 and outlet bend 210, preventing uneven flow and heat exchange, thus reducing adsorption column energy consumption and improving tail gas treatment efficiency.

[0056] See Figures 2-5 As shown, each inlet is connected to an inlet header 130 via a first inlet branch pipe 120. The inlet header 130 is located below the inlet bend 110 and is used to introduce cooling water. Each outlet is connected to an outlet header 230 via a first outlet branch pipe 220. The outlet header 230 is located below the inlet bend 110 and above the inlet header 130 (i.e., diagonally above the inlet header 130) and is used to discharge cooling water. External cooling water flows from the inlet header 130 through the first inlet branch pipe 120 into the inlet bends 110 of each layer to achieve uniform distribution. Then, it flows from the bottom into the adsorption column to participate in the recovery of tail gas in the polysilicon production process. The cooling water flowing out from the bottom of the adsorption column can be evenly returned to the outlet bends 210 of each layer due to the presence of the first outlet branch pipe 220, and then collects in the outlet header 230 to be discharged outside the adsorption column.

[0057] Each concentric water inlet bend 110 is connected to the bottom of the adsorption column via several upward-extending second water inlet branch pipes 140, and each concentric water outlet bend 210 is connected to the bottom of the adsorption column via several upward-extending second water outlet branch pipes 240. Specifically, the inlet bend 110 and outlet bend 210 of the first ring are connected to the bottom of the adsorption column through 6 circumferentially distributed second inlet branch pipes 140 and second outlet branch pipes 240, respectively. The inlet bend 110 and outlet bend 210 of the second ring are connected to the bottom of the adsorption column through 12 circumferentially distributed second inlet branch pipes 140 and second outlet branch pipes 240, respectively. The inlet bend 110 and outlet bend 210 of the third ring are connected to the bottom of the adsorption column through 18 circumferentially distributed second inlet branch pipes 140 and second outlet branch pipes 240, respectively. The inlet bend 110 and outlet bend 210 of the fourth ring (i.e., the outermost ring) are connected to the bottom of the adsorption column through 24 spaced-apart second inlet branch pipes 140 and second outlet branch pipes 240, respectively. The cooling water in the inlet bends 110 of each ring flows into the adsorption column after passing through several second inlet branch pipes 140. The cooling water flowing out from the bottom of the adsorption column flows back into the outlet bends 210 of each ring after passing through several second outlet branch pipes 240.

[0058] Both the inlet bend 110 and the outlet bend 210 are C-shaped structures with notches, and the notches face different or opposite directions. The end of the inlet header 130 away from the notch of the inlet bend 110 is its inlet, and the end of the outlet header 230 away from the notch of the outlet bend 210 is its outlet. In this way, the inlet header 130 and the outlet header 230 can be staggered for easy maintenance.

[0059] The bending radius of the outermost inlet bend 110 is greater than that of the outermost outlet bend 210, the bending radius of the outermost outlet bend 210 is greater than that of the second outermost inlet bend 110, and the bending radius of the second outermost inlet bend 110 is greater than that of the second outermost outlet bend 210. Specifically, the bending radius of the inlet bend 110 in the fourth ring (outermost ring) is 1400mm, the bending radius of the inlet bend 110 in the third ring is 1050mm, the bending radius of the inlet bend 110 in the second ring is 700mm, and the bending radius of the inlet bend 110 in the first ring is 350mm; the bending radius of the outlet bend 210 in the fourth ring (outermost ring) is 1545.5mm, the bending radius of the outlet bend 210 in the third ring is 1195.5mm, the bending radius of the outlet bend 210 in the second ring is 845.5mm, and the bending radius of the outlet bend 210 in the first ring is 495.5mm. In this way, their projections on the horizontal plane are staggered and stacked vertically, conforming to the principle of low inlet and high outlet water flow, which facilitates the assembly and disassembly of each connecting pipe.

[0060] In this embodiment, the inlet bend 110 and the outlet bend 210 have the same diameter, the first inlet branch pipe 120 and the first outlet branch pipe 220 have the same diameter, the inlet main pipe 130 and the outlet main pipe 230 have the same diameter, and the second inlet branch pipe 140 and the second outlet branch pipe 240 have the same diameter. Furthermore, the diameters of the second inlet branch pipe 140, the first inlet branch pipe 120, the inlet bend 110, and the inlet main pipe 130 increase sequentially. This results in low manufacturing costs.

[0061] The inlet manifold 100 and the outlet manifold 200 are made of the same material, Q345D. The inlet main pipe 130, the first inlet branch pipe 120, the inlet elbow 110 and the second inlet branch pipe 140 are welded and sealed in sequence, and the outlet main pipe 230, the first outlet branch pipe 220, the outlet elbow 210 and the second outlet branch pipe 240 are welded and sealed in sequence.

[0062] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A water collection pipe for a polycrystalline silicon tail gas recovery adsorption column, characterized in that, include: The water inlet manifold has multiple turns of water inlet bends that are respectively connected to the bottom of the adsorption column, which are used to distribute the water inlet volume of the adsorption column. and The water outlet manifold has multiple turns of water outlet bends that are respectively connected to the bottom of the adsorption column, which are used to distribute the water output of the adsorption column. The water outlet bend is higher than the water inlet bend, the outermost water inlet bend has at least one more inlet than the other water inlet bends, and the outermost water outlet bend has at least one more outlet than the other water outlet bends.

2. The water collection pipe of the polycrystalline silicon tail gas recovery adsorption column according to claim 1, characterized in that: The water inlet bends are arranged in four concentric rings at equal intervals. From the inside out, the first and second rings of water inlet bends each have one water inlet, the third ring has two water inlets, and the fourth ring has three water inlets. The water outlet bends are arranged in four concentric rings at equal intervals. From the inside out, the first and second rings of water outlet bends each have one water outlet, the third ring has two water outlets, and the fourth ring has three water outlets.

3. The water collection pipe of the polycrystalline silicon tail gas recovery adsorption column according to claim 2, characterized in that: Each of the aforementioned water inlets is connected to a water inlet main pipe via a first water inlet branch pipe. The water inlet main pipe is located below the water inlet bend and is used to introduce cooling water. Each of the aforementioned outlets is connected to an outlet main pipe via a first outlet branch pipe. The outlet main pipe is located below and above the inlet bend pipe and is used to draw out cooling water.

4. The water collection pipe of the polycrystalline silicon tail gas recovery adsorption column according to claim 3, characterized in that: Each concentric water inlet bend is connected to the bottom of the adsorption column via several upward-extending second water inlet branch pipes. Each concentric water outlet bend is connected to the bottom of the adsorption column via several upward-extending second water outlet branch pipes.

5. The water collection pipe of the polycrystalline silicon tail gas recovery adsorption column according to claim 4, characterized in that: The inlet and outlet bends of the first ring are connected to the bottom of the adsorption column through six circumferentially distributed second inlet and outlet branch pipes, respectively. The inlet and outlet bends of the second ring are connected to the bottom of the adsorption column through 12 circumferentially distributed second inlet and outlet branch pipes, respectively. The inlet and outlet bends of the third ring are connected to the bottom of the adsorption column through 18 circumferentially distributed second inlet and second outlet branch pipes. The inlet and outlet bends of the fourth ring are connected to the bottom of the adsorption column through 24 spaced second inlet and outlet branch pipes, respectively.

6. The water collection pipe of the polycrystalline silicon tail gas recovery adsorption column according to claim 3, characterized in that: Both the inlet bend and the outlet bend are C-shaped structures with notches, and the notches face different or opposite directions. The end of the inlet header that is away from the notch of the inlet bend is its inlet, and the end of the outlet header that is away from the notch of the outlet bend is its outlet.

7. The water collection pipe of the polycrystalline silicon tail gas recovery adsorption column according to any one of claims 2, 3, 5, and 6, characterized in that: The bending radius of the outermost inlet bend is greater than that of the outermost outlet bend. The bending radius of the outermost water outlet bend is greater than that of the next outermost water inlet bend. The bending radius of the inlet bend of the outermost ring is greater than that of the outlet bend of the outermost ring.

8. The water collection pipe of the polycrystalline silicon tail gas recovery adsorption column according to claim 7, characterized in that: The bending radius of the fourth ring water inlet bend is 1400mm, the bending radius of the third ring water inlet bend is 1050mm, the bending radius of the second ring water inlet bend is 700mm, and the bending radius of the first ring water inlet bend is 350mm. The bending radius of the fourth ring of the water outlet bend is 1545.5 mm, the bending radius of the third ring of the water outlet bend is 1195.5 mm, the bending radius of the second ring of the water outlet bend is 845.5 mm, and the bending radius of the first ring of the water outlet bend is 495.5 mm.

9. The water collection pipe of the polycrystalline silicon tail gas recovery adsorption column according to claim 5, characterized in that: The diameters of the inlet bend and the outlet bend are equal. The diameters of the first inlet branch pipe and the first outlet branch pipe are equal. The diameters of the inlet header and the outlet header are equal. The second inlet branch pipe and the second outlet branch pipe have the same diameter; The diameters of the second inlet branch pipe, the first inlet branch pipe, the inlet bend pipe, and the inlet main pipe increase sequentially.

10. The water collection pipe of the polycrystalline silicon tail gas recovery adsorption column according to claim 5 or 9, characterized in that: The inlet manifold and the outlet manifold are made of the same material, Q345D. The inlet main pipe, the first inlet branch pipe, the inlet bend pipe and the second inlet branch pipe are sequentially welded and sealed together, and the outlet main pipe, the first outlet branch pipe, the outlet bend pipe and the second outlet branch pipe are sequentially welded and sealed together.

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