Composite air cooler in chlorosilane separation process and pipeline system of composite air cooler

Abstract

The utility model discloses a composite air cooler and a pipeline system thereof in a chlorosilane separation process, which comprises a plurality of groups of composite air coolers, the input end of each group of composite air coolers is connected with the output end of a feeding distributor through a multi-stage feeding pipeline, the input end of the feeding distributor is connected with a gas phase pipeline at the top of a self-desorption low-tower, and the pipeline system is connected with a pipeline of a gas phase pipeline at the bottom of the self-desorption low-tower. The output end of each group of composite air coolers is connected with the input end of a collecting pipeline through a multi-stage discharge pipeline, and the output end of the collecting pipeline is connected with a pipeline of a low removal tower reflux tank; the pipe diameter of the multi-stage feeding pipeline in the material flowing direction is gradually reduced, and the pipe diameter of the multi-stage discharging pipeline in the material flowing direction is gradually increased; the pipeline distribution system disclosed by the utility model can solve the problem of non-uniform condensation under the condition that a plurality of groups of composite air coolers are used in the chlorosilane rectification separation process, and plays a decisive role in judging whether the plurality of groups of composite air coolers can be successfully applied to the chlorosilane separation process or not.

Description

TECHNICAL FIELD

[0001] The utility model relates to organic silicon chlorosilane separation's rectification system technical field, especially a composite air cooler and its pipeline system in chlorosilane separation process. BACKGROUND

[0002] The separation of chlorosilane in the production process of organic silicon usually uses the way of rectification, and the traditional device often selects a shell-and-tube heat exchanger as the condenser of the rectification tower, and uses the shell-and-tube heat exchanger to take circulating cooling water as the cooling medium. Because the gas-phase material at the top of the rectification tower is much, the condensation amount is huge, and a large amount of circulating water will be consumed. Especially when the production capacity of the rectification separation single set is high, the chlorosilane separation device of the applicant has a production capacity of 400,000 tons / year, and the most advanced coupling energy-saving system in the industry is applied, and the heat energy loss has been maximized. According to the calculation, the total consumption of circulating cooling water of the chlorosilane separation device during normal operation still needs about 3200m³ / h. The composite air cooler is a new type of heat exchanger developed in recent years, has good heat exchange effect, and is widely used in industrial production in recent years. The composite air cooler directly exchanges heat with the environment by relying on the principle of soft water spraying + air cooling, and the process completely eliminates the use of circulating water and other cooling media. Therefore, the advanced composite air cooler equipment is applied to the rectification separation system to replace the traditional shell-and-tube heat exchanger. In order to meet the performance requirements of the equipment, the composite air cooler of the low-temperature tower separation device is divided into 4 groups, and 24 gas-phase feed inlets and liquid-phase outlets are reached. In order to successfully apply the composite air cooler to the low-temperature tower system, the gas-phase feed pipe and the liquid-phase outlet pipe of the low-temperature tower need to be reasonably arranged to match the composite air cooler. Therefore, how to arrange the pipes plays a decisive role in whether the multiple composite air coolers can be successfully applied to the chlorosilane separation process, which is a problem to be solved. UTILITY MODEL CONTENTS

[0003] The utility model aims at overcoming the above-mentioned insufficient, provides a kind of composite air cooler and its pipeline system in chlorosilane separation process, and multiple composite air coolers are applied to chlorosilane separation process.

[0004] To solve the above technical problems, the technical scheme adopted by the utility model is as follows: a composite air cooler and its pipeline system in chlorosilane separation process, comprising multiple composite air coolers, the input end of each composite air cooler is connected with the output end of a feed distributor through a multistage feed pipeline, the input end of the feed distributor is connected with a gas-phase pipeline from the top of a low-temperature tower, the output end of each composite air cooler is connected with the input end of a collecting pipeline through a multistage outlet pipeline, and the output end of the collecting pipeline is connected with a reflux tank pipeline from the low-temperature tower; the pipe diameter of the multistage feed pipeline gradually decreases along the material flow direction, and the pipe diameter of the multistage outlet pipeline gradually increases along the material flow direction.

[0005] Preferably, the number of the composite air coolers is four, which are arranged in a rectangular array in a plane area and symmetrically arranged in pairs.

[0006] Preferably, the feed distributor comprises a feed main pipe connected with a self-depleted low column overhead gas phase pipeline, a feed branch pipe connected with the center of the outlet end of the feed main pipe, a feed connector pipe connected with the center of the end of the feed branch pipe, and a multi-stage feed pipeline connected with the outlet end of the feed connector pipe through a reducing pipe.

[0007] Preferably, the multi-stage feed pipeline comprises a first-stage feed pipe connected with the feed connector pipe through a reducing pipe, a second-stage feed pipe connected with the outlet end of the first-stage feed pipe through a reducing pipe, a third-stage feed pipe connected with the outlet end of the second-stage feed pipe, a fourth-stage feed pipe connected with the inlet end of the third-stage feed pipe, and the composite air cooler connected with the outlet end of the fourth-stage feed pipe.

[0008] Preferably, the number of the composite air cooler input ends is six, the number of the fourth-stage feed pipes is six, the outlet end of the first-stage feed pipe is connected with the inlet end of the second-stage feed pipe through a first right-angle elbow pipe, the first-stage feed pipe, the second-stage feed pipe, the third-stage feed pipe and the fourth-stage feed pipe are parallel to a horizontal reference plane, and the outlet end of the third-stage feed pipe is connected with the inlet end of the fourth-stage feed pipe through a second right-angle elbow pipe.

[0009] Preferably, the nominal diameter of the feed main pipe, the feed branch pipe and the feed connector pipe is 700 mm, the nominal diameter of the first-stage feed pipe is 450 mm, the nominal diameter of the second-stage feed pipe is 300 mm, the nominal diameter of the third-stage feed pipe is 250 mm, and the nominal diameter of the fourth-stage feed pipe is 150 mm.

[0010] Preferably, the collection pipeline comprises a collection main pipe connected with a self-depleted low column reflux tank pipeline, and a multi-stage discharge pipeline connected with the outlet end of the collection main pipe through a collection branch pipe.

[0011] Preferably, the multi-stage discharge pipeline comprises a first-stage discharge pipe connected with the inlet end of the collection branch pipe, a second-stage discharge pipe connected with the outlet end of the first-stage discharge pipe through a reducing pipe, a third-stage discharge pipe connected with the inlet end of the second-stage discharge pipe through a reducing pipe, and the composite air cooler connected with the outlet end of the third-stage discharge pipe.

[0012] Preferably, the number of the composite air cooler output ends is six, and the number of the third-stage discharge pipes is six.

[0013] Preferably, the nominal diameter of the collection main pipe is 300 mm, the nominal diameter of the collection branch pipe is 250 mm, the nominal diameter of the first-stage discharge pipe is 250 mm, the nominal diameter of the second-stage discharge pipe is 200 mm, and the nominal diameter of the third-stage discharge pipe is 100 mm.

[0014] The utility model discloses beneficial effect: this pipeline distribution system of the utility model can solve the problem of uneven condensation of multiple composite air coolers in the chlorosilane rectification separation process, and plays a decisive role on whether multiple composite air coolers can be successfully applied to the chlorosilane separation process; it can make each stage pipeline be in the same horizontal plane respectively through the symmetrical horizontal distribution structure, guarantee that the pressure of each pipeline is same, can also guarantee that the final total pressure drop range is in normal range, makes the temperature difference of composite air cooler liquid phase branch pipe of different regions extremely small. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a layout plane schematic view of composite air cooler and pipeline system in chlorosilane separation process;

[0016] Figure 2 It is Figure 1 the enlarged structural schematic diagram of the area of multistage feed pipeline;

[0017] Figure 3 It is Figure 1 the enlarged structural schematic diagram of the area of multistage discharge pipeline;

[0018] Figure 4 It is the overhead structural schematic diagram of the connection of feed distributor and the first stage feed pipe of multistage feed pipeline;

[0019] Figure 5 It is Figure 4 the A-A sectional structural schematic diagram;

[0020] Figure 6 It is the overhead structural schematic diagram of multistage feed pipeline;

[0021] Figure 7 It is Figure 6 the front view structural schematic diagram of the connection of third stage feed pipe outlet and second straight elbow pipe in it. DETAILED DESCRIPTION

[0022] The utility model will be further described in detail in combination with the drawings and specific embodiment.

[0023] For example, Figures 1-7As shown, a composite air cooler and its piping system in a chlorosilane separation process, including multiple groups of composite air coolers 1, the input end of each group of composite air coolers 1 is connected with the output end of a feed distributor 3 through multiple-stage feed pipelines 2, the input end of the feed distributor 3 is connected with a self-depleted low column overhead gas phase pipeline 4, the output end of each group of composite air coolers 1 is connected with the input end of a collection pipeline 6 through multiple-stage discharge pipelines 5, and the output end of the collection pipeline 6 is connected with a depleted low column reflux tank pipeline 7; the pipe diameter of the multiple-stage feed pipelines 2 gradually decreases along the material flow direction, and the pipe diameter of the multiple-stage discharge pipelines 5 gradually increases along the material flow direction. The condensation amount of the gas phase of the depleted low column in the chlorosilane separation process is 67984.216 kg / h-149565.275 kg / h, the gas phase pressure is 0.03 MPa G-0.08 MPa G, the gas phase temperature is 50℃-70℃, and the temperature of the condensed liquid phase is 30℃-40℃.

[0024] Preferably, the number of the composite air coolers 1 is four, which are arranged in a rectangular array in a planar area and symmetrically arranged in pairs. In this embodiment, as shown in the figure, Figure 1 As shown in the figure, one group of composite air coolers 1 is arranged in each of the E-A, E-B, E-C and E-D areas. The four groups of composite air cooler devices have the same performance, the same external dimensions, and the same pipe port arrangement on each group of composite air coolers; the arrangement spacing H1 of E-A and E-D is 3000mm, E-A and E-D are symmetrically arranged, and the symmetry axis is Z1; the arrangement spacing H2 of E-B and E-C is 3000mm, E-B and E-C are symmetrically arranged, and the symmetry axis is Z1; the arrangement spacing H3 of E-A and E-B is 7000mm, E-A and E-B are symmetrically arranged, and the symmetry axis is Z2; the arrangement spacing H4 of E-D and E-C is 7000mm, E-D and E-C are symmetrically arranged, and the symmetry axis is Z2.

[0025] There are gas phase feed ports (N1) and liquid phase discharge ports (N2) on the composite air cooler 1; taking the bottom edge of the depleted low column composite air cooler as the 0m horizontal reference plane layer, the center of the gas phase feed port (N1) is 44870mm away from the 0m horizontal reference plane layer, and the center distance between the adjacent six gas phase feed ports (N1) on each group of composite air coolers 1 is 1465mm; the center of the liquid phase discharge port (N2) is 2132mm away from the 0m horizontal reference plane layer, and the center distance between the adjacent six liquid phase discharge ports (N2) on each group of composite air coolers 1 is 980mm.

[0026] Preferably, the feed distributor 3 comprises a feed main pipe 3.1 connected with the self-depleted low column overhead gas phase pipeline 4, the outlet end of the feed main pipe 3.1 is connected with the center of the feed branch pipe 3.2 vertically, the end of the feed branch pipe 3.2 is connected with the center of the feed connecting pipe 3.3 vertically, and the end of the feed connecting pipe 3.3 is connected with the inlet end of the multi-stage feed pipeline 2 through a reducing pipe. In this embodiment, the feed main pipe 3.1 and the feed branch pipe 3.2 are both straight pipe sections, and are connected with each other vertically, and the connection direction of the feed main pipe 3.1 and the feed branch pipe 3.2 is parallel to the horizontal reference plane; the feed branch pipe 3.2 is parallel to the horizontal reference plane, and the pipe center of the feed branch pipe 3.2 is 73560 mm above the horizontal reference plane; the end of the feed branch pipe 3.2 is also connected with the center of the feed connecting pipe 3.3 vertically, and the connection direction is parallel to the horizontal reference plane; the feed connecting pipe 3.3 is parallel to the horizontal reference plane, and the pipe center of the feed connecting pipe 3.3 is 73560 mm above the horizontal reference plane; and the reducing pipes on both sides are installed horizontally;

[0027] Preferably, the multi-stage feed pipeline 2 comprises a first-stage feed pipe 2.1 connected with the feed connecting pipe 3.3 through a reducing pipe, the outlet of the first-stage feed pipe 2.1 is connected with the inlet of a second-stage feed pipe 2.2 through a reducing pipe, the outlet of the second-stage feed pipe 2.2 is connected with a third-stage feed pipe 2.3, the outlet of the third-stage feed pipe 2.3 is connected with the inlet of a fourth-stage feed pipe 2.4, and the outlet of the fourth-stage feed pipe 2.4 is connected with the input end of the composite air cooler 1.

[0028] Preferably, the input end of the composite air cooler 1 is six, and the number of the fourth-stage feed pipe 2.4 is six; the outlet of the first-stage feed pipe 2.1 is connected with the inlet of the second-stage feed pipe 2.2 vertically through a first right-angle elbow pipe 2.5, the first-stage feed pipe 2.1, the second-stage feed pipe 2.2, the third-stage feed pipe 2.3 and the fourth-stage feed pipe 2.4 are all parallel to the horizontal reference plane, and the outlet of the third-stage feed pipe 2.3 is connected with the inlet of the fourth-stage feed pipe 2.4 vertically through a second right-angle elbow pipe 2.6. In this embodiment, when the chlorosilane separation system runs at 50% to 110% of the load, the total pressure drop of the fourth-stage distribution pipe is not higher than 10 KPa and not lower than 3 KPa. In this embodiment, the pipe center of the first-stage feed pipe 2.1 is 72290 mm above the horizontal reference plane, the pipe center of the second-stage feed pipe 2.2 and the third-stage feed pipe 2.3 is 56920 mm above the horizontal reference plane, and the pipe center of the fourth-stage feed pipe 2.4 is 44870 mm above the horizontal reference plane. Through the above pipeline layout structure, each stage of pipeline can be in the same horizontal plane, the pressure at each part of the pipeline is ensured to be the same, and the final total pressure drop range can be ensured to be within the normal range.

[0029] Preferably, the nominal diameter of the feed main pipe 3.1, the feed branch pipe 3.2 and the feed connecting pipe 3.3 is 700 mm, the nominal diameter of the first-stage feed pipe 2.1 is 450 mm, the nominal diameter of the second-stage feed pipe 2.2 is 300 mm, the nominal diameter of the third-stage feed pipe 2.3 is 250 mm, and the nominal diameter of the fourth-stage feed pipe 2.4 is 150 mm.

[0030] Preferably, the collecting pipeline 6 comprises a collecting main pipe 6.1 connected with the de- low-boiling reflux tank pipeline 7, and the collecting main pipe 6.1 is connected with the output end of the multi-stage discharge pipeline 5 through a collecting branch pipe 6.2.

[0031] Preferably, the multi-stage discharge pipeline 5 comprises a first-stage discharge pipe 5.1 connected with the input end of the collecting branch pipe 6.2, the inlet of the first-stage discharge pipe 5.1 is connected with the outlet of a second-stage discharge pipe 5.2 through a reducing pipe, the inlet of the second-stage discharge pipe 5.2 is connected with the outlet of a third-stage discharge pipe 5.3 through a reducing pipe, and the inlet of the third-stage discharge pipe 5.3 is connected with the output end of the composite air cooler 1.

[0032] Preferably, the output end of the composite air cooler 1 is six, and the number of the third-stage discharge pipe 5.3 is six.

[0033] Preferably, the nominal diameter of the collecting main pipe 6.1 is 300 mm, the nominal diameter of the collecting branch pipe 6.2 is 250 mm, the nominal diameter of the first-stage discharge pipe 5.1 is 250 mm, the nominal diameter of the second-stage discharge pipe 5.2 is 200 mm, and the nominal diameter of the third-stage discharge pipe 5.3 is 100 mm.

[0034] In the above technical solution, the pipe sizes of each stage are calculated by Bernoulli equation, continuity equation and Fanning equation, and the gas phase flow rate is not higher than 15 m / s.

[0035] Example 1

[0036] When the de- low-boiling tower of the chlorosilane separation system is operated at 50% load, the amount of gas phase at the top of the tower is 67984.216 kg / h, the temperature is 55℃, and the pressure is 0.04 MPa G. Within the load adjustment range of the de- low-boiling tower composite air cooler, the pressure drop of the gas phase distribution pipe is 4 Kpa-5 Kpa, the temperature of the total liquid phase after condensation is 32℃, the temperature difference of the liquid phase distribution pipes of EA, EB, EC and ED is less than 0.6℃, and the amount of circulating water cooling water that can be saved is 575 m³ / h.

[0037] Example 2

[0038] When the low-removing column of the chlorosilane separation system is operated at 70% load, the amount of the gaseous phase at the top of the column is 95177.902 kg / h, the temperature is 58℃, the pressure is 0.05 MPa G, within the load adjustment of the compound air cooler of the low-removing column, the pressure drop of the gaseous phase distribution pipe is 5 KPa-7 KPa, the temperature of the condensed liquid phase is 35℃, the temperature difference of the liquid phase distribution pipe of EA, EB, EC and ED is less than 1℃, and the amount of the recycled water cooling water that can be saved is 805 m³ / h.

[0039] Example 3

[0040] When the low-removing column of the chlorosilane separation system is operated at 100% load, the amount of the gaseous phase at the top of the column is 135968.432 kg / h, the temperature is 63℃, the pressure is 0.07 MPa G, within the load adjustment of the compound air cooler of the low-removing column, the pressure drop of the gaseous phase distribution pipe is 7 KPa-8 KPa, the temperature of the condensed liquid phase is 37℃, the temperature difference of the liquid phase distribution pipe of EA, EB, EC and ED is less than 1.5℃, and the amount of the recycled water cooling water that can be saved is 1150 m³ / h.

[0041] Example 4

[0042] When the low-removing column of the chlorosilane separation system is operated at 110% load, the amount of the gaseous phase at the top of the column is 149565.275 kg / h, the temperature is 68℃, the pressure is 0.08 MPa G, within the load adjustment of the compound air cooler of the low-removing column, the pressure drop of the gaseous phase distribution pipe is 8 KPa-9 KPa, the temperature of the condensed liquid phase is 39℃, the temperature difference of the liquid phase distribution pipe of EA, EB, EC and ED is less than 2℃, and the amount of the recycled water cooling water that can be saved is 1265 m³ / h.

[0043] The above-mentioned examples are only preferred technical solutions of the present application, and should not be regarded as limiting the present application. The protection scope of the present application should be the technical solutions recited in the claims, including equivalent replacement solutions of the technical features recited in the claims. That is, equivalent replacement improvements within the scope also fall within the protection scope of the present application.

Claims

1. A composite air cooler and its piping system in a chlorosilane separation process, comprising a plurality of composite air coolers (1), characterized in that: The input end of each group of composite air coolers (1) is connected to the output end of the feed distributor (3) through a multi-stage feed pipeline (2), the input end of the feed distributor (3) is connected to the gas phase pipeline (4) at the top of the degassing tower, and the output end of each group of composite air coolers (1) is connected to the input end of the collecting pipeline (6) through a multi-stage discharge pipeline (5), and the output end of the collecting pipeline (6) is connected to the degassing tower reflux tank pipeline (7); the diameter of the multi-stage feed pipeline (2) gradually decreases along the material flow direction, and the diameter of the multi-stage discharge pipeline (5) gradually increases along the material flow direction.

2. The composite air cooler and piping system thereof in a chlorosilane separation process according to claim 1, characterized in that: The number of the composite air coolers (1) is four, which are distributed in a rectangular array in a plane area and are symmetrically arranged in pairs.

3. The composite air cooler and piping system thereof in a chlorosilane separation process according to claim 2, characterized in that: The feed distributor (3) comprises a feed main pipe (3.1) connected to the gas phase pipeline (4) at the top of the self-degassing tower, the outlet end of the feed main pipe (3.1) being vertically connected to the center of the feed branch pipe (3.2), the end of the feed branch pipe (3.2) being vertically connected to the center of the feed connecting pipe (3.3), and the end of the feed connecting pipe (3.3) being connected to the inlet end of the multi-stage feed pipeline (2) via a reducing pipe.

4. The composite air cooler and piping system thereof in a chlorosilane separation process according to claim 3, characterized in that: The multi-stage feed pipeline (2) comprises a first-stage feed pipe (2.1) connected to a feed connecting pipe (3.3) via a reducer, the outlet of the first-stage feed pipe (2.1) is connected to the inlet of a second-stage feed pipe (2.2) via a reducer, the outlet of the second-stage feed pipe (2.2) is connected to the third-stage feed pipe (2.3), the outlet of the third-stage feed pipe (2.3) is connected to the inlet of a fourth-stage feed pipe (2.4), and the outlet of the fourth-stage feed pipe (2.4) is connected to the input end of the composite air cooler (1).

5. The composite air cooler and piping system thereof in a chlorosilane separation process according to claim 4, characterized in that: The composite air cooler (1) has six input ends and six four-stage feed pipes (2.4); the outlet of the first-stage feed pipe (2.1) is vertically connected to the inlet of the second-stage feed pipe (2.2) through a first right-angle bend (2.5); the first-stage feed pipe (2.1), the second-stage feed pipe (2.2), the third-stage feed pipe (2.3) and the fourth-stage feed pipe (2.4) are all parallel to the horizontal reference plane; the outlet of the third-stage feed pipe (2.3) is vertically connected to the inlet of the fourth-stage feed pipe (2.4) through a second right-angle bend (2.6).

6. The composite air cooler and piping system thereof in a chlorosilane separation process according to claim 4, characterized in that: The nominal diameters of the main feed pipe (3.1), the branch feed pipe (3.2) and the feed connecting pipe (3.3) are 700 mm, the nominal diameter of the first-stage feed pipe (2.1) is 450 mm, the nominal diameter of the second-stage feed pipe (2.2) is 300 mm, the nominal diameter of the third-stage feed pipe (2.3) is 250 mm, and the nominal diameter of the fourth-stage feed pipe (2.4) is 150 mm.

7. The composite air cooler and piping system thereof in a chlorosilane separation process according to claim 1, characterized in that: The collecting pipeline (6) includes a collecting main pipe (6.1) connected to the low tower reflux tank pipeline (7) for removing the wastewater. The collecting main pipe (6.1) is connected to the output end of the multi-stage discharge pipeline (5) through a collecting branch pipe (6.2).

8. The composite air cooler and piping system thereof in a chlorosilane separation process according to claim 7, characterized in that: The multi-stage discharge pipeline (5) comprises a first-stage discharge pipe (5.1) connected to the input end of the collecting branch pipe (6.2); the inlet of the first-stage discharge pipe (5.1) is connected to the outlet of the second-stage discharge pipe (5.2) via a reducing pipe; the inlet of the second-stage discharge pipe (5.2) is connected to the outlet of the third-stage discharge pipe (5.3) via a reducing pipe; and the inlet of the third-stage discharge pipe (5.3) is connected to the output end of the composite air cooler (1).

9. The composite air cooler and piping system thereof in a chlorosilane separation process according to claim 7, characterized in that: The composite air cooler (1) has six output ends and six three-stage discharge pipes (5.3).

10. The composite air cooler and piping system thereof in a chlorosilane separation process according to claim 8, characterized in that: The nominal diameter of the collecting main pipe (6.1) is 300 mm, the nominal diameter of the collecting branch pipe (6.2) is 250 mm, the nominal diameter of the first-level discharge pipe (5.1) is 250 mm, the nominal diameter of the second-level discharge pipe (5.2) is 200 mm, and the nominal diameter of the third-level discharge pipe (5.3) is 100 mm.

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