Flash tank

Abstract

The embodiment of the utility model provides a flash tank, and relates to the technical field of flash. The flash tank comprises a tank body and a distribution pipe; the distribution pipe is mounted in the tank body and is provided with two inlets which are positioned on the outer side of the tank body; a partition plate is arranged in the distribution pipe and is configured to divide the distribution pipe into a first section and a second section. The distribution pipe is divided into the first section and the second section through the partition plate, it is guaranteed that fluid in all the sections of the distribution pipe has high pressure when the flash tank is in the low load state, therefore, flash evaporation of the fluid in the distribution pipe can be avoided, the vibration phenomenon of the flash tank is eliminated, and then the operation stability of the flash tank is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flash evaporation, in particular to a flash evaporation tank. Background Art

[0002] Polysilicon production technology is a modified Siemens process. The core step of this process is the trichlorosilane reduction reaction unit, where vaporized, preheated trichlorosilane is mixed with hydrogen in a specific ratio and then introduced into a reduction furnace. Under a specific temperature and pressure, a chemical vapor deposition reaction occurs on an electrically powered, high-temperature silicon core, producing high-purity polysilicon. During normal operation in the reduction furnace, circulating water is passed through the furnace drum and jacket to remove heat radiated to the furnace walls, maintaining a suitable wall temperature. The heat-absorbed high-temperature water then enters a flash tank for flash evaporation, with the resulting steam entering the steam network.

[0003] In the prior art, a flash tank consists of a tank body, a distribution pipe, and an outlet pipe. The distribution pipe and outlet pipe are connected to the tank body. The distribution pipe has two inlets and is located inside the tank body. The distribution pipe is equipped with multiple nozzles and is connected to the main pipe of the reduction furnace. The high-temperature liquid phase enters the tank body through the distribution pipe and directly flashes. The flashed gas phase enters the steam network through the outlet pipe, while the liquid phase remains in the tank, achieving gas-liquid separation.

[0004] However, when the flash tank is at low load, the pressure of the liquid entering the distribution pipe is low, flashing occurs, causing the flash tank to vibrate, reducing the stability of the flash tank operation. Utility Model Content

[0005] The embodiment of the utility model provides a flash tank to solve the problem that when the flash tank is under low load, the high-temperature liquid phase pressure entering the distribution pipe is low, flashing occurs, causing the flash tank to vibrate and reducing the stability of the flash tank operation.

[0006] The embodiment of the utility model provides a flash tank, comprising a tank body and a distribution pipe;

[0007] The distribution pipe is partially installed in the tank body, and the distribution pipe has two inlets, and the two inlets are located outside the tank body;

[0008] A partition is provided inside the distribution pipe, and the partition is configured to separate the distribution pipe into a first section and a second section, so as to separate the fluid in the first section from the fluid in the second section.

[0009] In a possible implementation manner, the inlet of the first section and the inlet of the second section are both connected to a branch pipe.

[0010] In a possible implementation manner, a pressure regulating valve is provided on the branch pipe corresponding to the first section, and the pressure regulating valve can adjust the fluid pressure in the main pipe.

[0011] In a possible implementation, the second section of the distribution pipe is further provided with a pressure switch valve, which can close or at least partially open the fluid in the branch pipe.

[0012] In a possible implementation, the first section and the second section are symmetrically arranged relative to the partition plate.

[0013] In a possible implementation, the top of the tank body is provided with a plurality of distribution pipes, which are arranged at intervals along the length direction of the tank body.

[0014] In a possible implementation, the first section and the second section are each provided with a plurality of nozzles.

[0015] In a possible implementation, the gas outlet pipe is further provided, which is installed at the top of the tank body.

[0016] In a possible implementation, the gas outlet pipe is arranged between the two inlets of the distribution pipe, and the gas outlet pipe is internally provided with a wire mesh demister.

[0017] In a possible implementation, the bottom of the tank body is provided with a liquid outlet.

[0018] The embodiment of the utility model provides a flash tank, including tank body and distribution pipe, distribution pipe part is installed in tank body, distribution pipe has two inlets, two inlets are located at the outside of tank body, distribution pipe is internally provided with partition plate, partition plate is configured as separating distribution pipe into first section and second section, to separate the fluid in first section with the fluid in second section. The distribution pipe is divided into a first section and a second section by the partition plate, which reduces the pressure loss of the two fluids in the distribution pipe, ensures that the fluid in each section of the distribution pipe has a high pressure when the flash tank is under low load, thereby avoiding the flash of the fluid in the distribution pipe, eliminating the vibration phenomenon of the flash tank, and improving the stability of the flash tank operation.

[0019] The distribution pipe is divided into a first section and a second section by the partition plate, and the two fluids entering from the two inlets of the distribution pipe are separated by the partition plate, which avoids the impact of the two fluids entering the distribution pipe on the same nozzle, reduces the impact on the nozzle, and thus improves the service life of the nozzle. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 A schematic structural diagram of a flash tank provided in an embodiment of the present utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the distribution pipe, partition and nozzle;

[0023] Figure 3 for Figure 1 Schematic diagram of the connection of the flash tank used in the reduction furnace.

[0024] Description of reference numerals:

[0025] 1-Flash tank; 10-Tank body;

[0026] 101-liquid outlet; 20-distribution pipe;

[0027] 201-Import; 21-First paragraph;

[0028] 22-Second section; 30-Separator;

[0029] 40-nozzle; 50-branch pipe;

[0030] 60-pressure regulating valve; 70-pressure switching valve;

[0031] 80-exhaust pipe; 90-wire mesh demister;

[0032] 100-reduction furnace; 200-main pipe;

[0033] 300-circulation pump; 400-pipeline. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0036] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0038] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0039] As described in the background, when the flash tank is under low load, the liquid pressure entering the distribution pipe is low, causing flash evaporation. This causes vibration in the flash tank and reduces its operational stability. The inventors discovered that this problem arises because the two inlets of the distribution pipe are connected. When the flash tank is under low load, the liquid pressure entering the distribution pipe is low, causing flash evaporation. This causes vibration in the flash tank and reduces its operational stability.

[0040] In order to solve the above problems, an embodiment of the present invention provides a flash tank, which divides the distribution pipe into a first section and a second section by a partition, thereby reducing the pressure loss of the two fluids in the distribution pipe, and ensuring that the fluids in each section of the distribution pipe have a higher pressure when the flash tank is under low load, thereby avoiding flashing of the fluid in the distribution pipe, eliminating the vibration phenomenon of the flash tank, and thereby improving the stability of the flash tank operation.

[0041] The flash tank provided by the embodiment of the utility model is described in detail below with reference to specific embodiments.

[0042] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a flash tank 1, comprising a tank body 10 and a distribution pipe 20; the distribution pipe 20 is partially installed in the tank body 10, and the distribution pipe 20 has two inlets 201, and the two inlets 201 are located on the outside of the tank body 10; a partition 30 is provided inside the distribution pipe 20, and the partition 30 is configured to separate the distribution pipe 20 into a first section 21 and a second section 22, so as to separate the fluid in the first section 21 from the fluid in the second section 22.

[0043] The fluid medium entering the flash tank 1 can be water or other fluids, such as isooctane. Figure 3 As shown, the flash tank 1 is connected to the main pipe 200 of the reduction furnace 100 , and the high-temperature water after heat exchange between the furnace drum and the jacket of the reduction furnace 100 flows into the main pipe 200 , and the water in the main pipe 200 enters the flash tank 1 .

[0044] The length direction of the tank body 10 is the X-axis direction, the height direction of the tank body 10 is the Y-axis direction, and the X-axis and the Y-axis are perpendicular to each other.

[0045] The top of the can body 10 is one side of the can body 10 in the +Y axis direction, and the bottom of the can body 10 is one side of the can body 10 in the −Y axis direction.

[0046] The tank body 10 has a receiving cavity. The distribution pipe 20 is located at the top of the tank body 10 . Two inlets 201 of the distribution pipe 20 are exposed outside the tank body 10 . Water in the main pipe 200 of the reduction furnace 100 enters the distribution pipe 20 through the two inlets 201 .

[0047] The position of the partition 30 inside the distribution pipe 20 is not particularly limited, as long as the first section 21 and the second section 22 are not connected to each other.

[0048] The first section 21 and the second section 22 each correspond to an inlet 201 .

[0049] The fluid in the first section 21 is the water flow flowing into the first section 21 through the main pipe 200 of the reduction furnace 100, and the fluid in the second section 22 is the water flow flowing into the second section 22 through the main pipe 200 of the reduction furnace 100. The fluid in the first section 21 and the fluid in the second section 22 do not contact each other, that is, the fluid in the first section 21 and the fluid in the second section 22 will not collide.

[0050] Multiple nozzles 40 are provided on the first section 21 and the second section 22. The fluid in the first section 21 is sprayed into the interior of the tank body 10 through the nozzles 40 on the first section 21, and the fluid in the second section 22 is sprayed into the interior of the tank body 10 through the nozzles 40 on the second section 22.

[0051] The distribution pipe 20 may be provided with a nozzle 40 on one side in the -Y axis direction. In other embodiments, the distribution pipe 20 may also be provided with a nozzle 40 in a direction inclined 45 degrees to the -Y axis direction.

[0052] The two fluids entering the distribution pipe 20 will not collide, which can reduce the energy loss of the two fluids and thus reduce the pressure loss of the two fluids in the distribution pipe 20.

[0053] The flash tank provided in the embodiment of the present invention divides the distribution pipe 20 into a first section 21 and a second section 22 by a partition 30, thereby reducing the pressure loss of the two fluids in the distribution pipe 20 and ensuring that the fluids in each section of the distribution pipe 20 have a higher pressure when the flash tank is under low load, thereby avoiding flashing of the fluid in the distribution pipe 20, eliminating the vibration phenomenon of the flash tank, and thus improving the stability of the flash tank operation.

[0054] The distribution pipe 20 is divided into a first section 21 and a second section 22 by a partition 30. The two fluids entering from the two inlets 201 in the distribution pipe 20 are separated by the partition 30, preventing the two fluids entering the distribution pipe 20 from impacting the same nozzle 40, reducing the impact on the nozzle 40, and thereby increasing the life of the nozzle 40.

[0055] It should be noted that the maximum flow rate of the main pipe 200 is the preset flow rate of the main pipe 200. In some examples, when the flow rate of the main pipe 200 is less than 25% of the preset flow rate of the main pipe 200, the flash tank is at low load.

[0056] In one possible implementation, Figure 1 As shown, the inlet 201 of the first section 21 and the inlet 201 of the second section 22 are both connected to a branch pipe 50. This arrangement allows the water flow in the main pipe 200 of the reduction furnace 100 to flow into the distribution pipe 20 through the two branch pipes 50.

[0057] Among them, the two branch pipes 50 corresponding to the distribution pipe 20 are connected to the main pipe 200 of the reduction furnace 100, that is, the water flow in the main pipe 200 of the reduction furnace 100 can flow into the two branch pipes 50 corresponding to the distribution pipe 20, and the water flow in the two branch pipes 50 flows into the first section 21 and the second section 22 respectively.

[0058] A pressure regulating valve 60 is installed on the branch pipe 50 corresponding to the first section 21. This valve regulates the fluid pressure in the main pipe 200. The valve 60 is connected to the control unit of the reduction furnace 100, which adjusts the valve opening of the valve 60 to adjust the fluid pressure in the main pipe 200.

[0059] A pressure switch valve 70 is further provided on the branch pipe 50 corresponding to the second section 22 . The pressure switch valve 70 can close or at least partially open the fluid in the branch pipe 50 .

[0060] The pressure switching valve 70 can adjust the fluid pressure in the main pipe 200. The pressure switching valve 70 adjusts the fluid pressure in the main pipe 200 by manually adjusting the valve opening.

[0061] By regulating the fluid pressure in the main pipe 200 through the pressure regulating valve 60 and the pressure switching valve 70 , it is possible to eliminate the need for providing a valve for regulating the fluid pressure in the main pipe 200 of the reduction furnace 100 .

[0062] In a possible embodiment, a plurality of distribution pipes 20 are provided on the top of the tank body 10 , and the plurality of distribution pipes 20 are arranged at intervals along the length direction of the tank body 10 .

[0063] Among them, the number of distribution pipes 20 can be 2, 3, 4 or 5, etc., without specific setting.

[0064] For example, Figure 1 As shown, the number of distribution pipes 20 can be 2, and the 2 distribution pipes 20 are spaced apart along the length direction of the tank body 10. The first section 21 and the second section 22 of each distribution pipe 20 correspond to a branch pipe 50 respectively. That is to say, the flash tank is provided with 2 distribution pipes 20 and 4 branch pipes 50, and each distribution pipe 20 corresponds to 2 branch pipes 50. The 2 branch pipes 50 are respectively installed with a pressure regulating valve 60 and a pressure switching valve 70.

[0065] When the flow rate of the main pipe 200 of the reduction furnace 100 is greater than 75% of the maximum flow rate of the main pipe 200 and less than the maximum flow rate of the main pipe 200, fluid flows into the first section 21 and the second section 22 of the two distribution pipes 20, and the fluid pressure in the main pipe 200 is adjusted by the pressure regulating valve 60 and the pressure switching valve 70 on the two branch pipes 50 corresponding to each distribution pipe 20.

[0066] When the flow rate of the main pipe of the reduction furnace 100 is greater than 50% of the maximum flow rate of the main pipe 200 and less than 75% of the maximum flow rate of the main pipe 200, fluid flows into the first section 21 and the second section 22 of a distribution pipe 20, and the fluid pressure in the main pipe 200 is adjusted by the pressure regulating valve 60 and the pressure switching valve 70 on the two branch pipes 50 corresponding to the distribution pipe 20; fluid flows into the first section 21 of the other distribution pipe 20, and no fluid flows into the second section 22, that is, the pressure switching valve 70 on the branch pipe 50 corresponding to the second section 22 is in a closed state, and the fluid pressure in the main pipe 200 is adjusted by the pressure regulating valve 60 on the branch pipe 50 corresponding to the first section 21 of the distribution pipe 20.

[0067] When the flow rate of the main pipe 200 of the reduction furnace 100 is greater than 25% of the maximum flow rate of the main pipe 200 and less than 50% of the maximum flow rate of the main pipe, fluid flows into only the first section 21 and the second section 22 of one distribution pipe 20 of the flash tank, and the fluid pressure in the main pipe 200 is adjusted by the pressure regulating valve 60 and the pressure switch valve 70 on the two branch pipes 50 corresponding to the distribution pipe 20.

[0068] When the flow rate of the main pipe 200 of the reduction furnace 100 is less than 25% of the maximum flow rate of the main pipe 200, fluid flows into only the first section 21 of one distribution pipe 20 of the flash tank, and no fluid flows into the second section 22 of the distribution pipe 20. That is to say, the pressure switching valve 70 on the branch pipe 50 corresponding to the second section 22 is in a closed state, and the fluid pressure in the main pipe 200 is adjusted by the pressure regulating valve 60 on the branch pipe 50 corresponding to the first section 21 of the distribution pipe 20.

[0069] In one possible implementation, Figure 1 As shown, the flash tank further includes an air outlet pipe 80 , which is installed on the top of the tank body 10 , that is, the air outlet pipe 80 is installed on one side of the tank body 10 in the +Y axis direction.

[0070] The steam in the tank body 10 is discharged from the exhaust pipe 80 .

[0071] The number of the gas outlet pipes 80 can be one or more. For example, the flash tank includes two distribution pipes 20 and two gas outlet pipes 80 , and one gas outlet pipe 80 is provided between the two inlets 201 of the distribution pipe 20 .

[0072] A wire mesh demister 90 is provided inside the outlet pipe 80. The wire mesh demister 90 is a component that can achieve gas-liquid separation. The wire mesh demister 90 includes a wire mesh for removing liquid droplets in the gas. Specifically, the wire mesh demister 90 can separate liquid water entrained by the steam in the outlet pipe 80.

[0073] In one possible implementation, Figure 1 and Figure 3 As shown, a liquid outlet 101 is provided at the bottom of the tank body 10 , and the liquid water in the tank body 10 flows out from the liquid outlet 101 and flows into between the furnace drum and the jacket of the reduction furnace 100 through the circulation pump 300 and the pipeline 400 .

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flash tank, characterized in that: Including tank and distribution pipe; The distribution pipe is partially installed in the tank body, and the distribution pipe has two inlets, and the two inlets are located outside the tank body; A partition is provided inside the distribution pipe, and the partition is configured to separate the distribution pipe into a first section and a second section, so as to separate the fluid in the first section from the fluid in the second section so that the fluid in the first section does not collide with the fluid in the second section; The first section and the second section are symmetrically arranged relative to the partition.

2. The flash tank according to claim 1, characterized in that The inlet of the first section and the inlet of the second section are both connected to a branch pipe.

3. The flash tank according to claim 2, characterized in that The branch pipe corresponding to the first section is provided with a pressure regulating valve, and the pressure regulating valve can regulate the fluid pressure in the main pipe.

4. The flash tank according to claim 3, characterized in that The branch pipe corresponding to the second section is further provided with a pressure switch valve, and the pressure switch valve can close or at least partially open the fluid in the branch pipe.

5. The flash tank according to claim 1, characterized in that A plurality of distribution pipes are arranged on the top of the tank body, and the plurality of distribution pipes are arranged at intervals along the length direction of the tank body.

6. The flash tank according to any one of claims 1 to 5, characterized in that: A plurality of nozzles are provided on the first section and the second section.

7. The flash tank according to any one of claims 1 to 5, characterized in that: It also includes an air outlet pipe, which is installed on the top of the tank body.

8. The flash tank according to claim 7, characterized in that An air outlet pipe is provided between the two inlets of the distribution pipe, and a wire mesh demister is provided inside the air outlet pipe.

9. The flash tank according to any one of claims 1 to 5, characterized in that: The bottom of the tank is provided with a liquid outlet.

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