Chemical outdoor conveying pipeline under high-temperature weather condition

Abstract

The invention discloses an outdoor conveying pipeline for chemicals under the high-temperature weather condition, belongs to the technical field of chemical liquid conveying, and aims at solving the problems that in the prior art, in the high-temperature weather condition, in the conveying process of the chemicals in an outdoor conveying pipeline, the yield of subsequent products is affected, and the safety of the conveying process is poor. The outdoor conveying pipeline comprises a heat preservation shell, a plurality of chemical pipelines, a plurality of cooling pipelines and a cooling liquid supply unit, the chemical pipelines and the cooling pipelines are arranged in the heat preservation shell, the cooling liquid supply unit supplies cooling liquid to the cooling pipelines, the chemical pipelines and the cooling pipelines are alternately arranged, and gaps are formed among the chemical pipelines, the cooling pipelines and the heat preservation shell. The device can be used for outdoor conveying of chemicals under the high-temperature weather condition.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical liquid transportation, and in particular relates to an outdoor chemical transportation pipeline under high temperature weather conditions. Background Art

[0002] The semiconductor industry uses a large number of chemical supply systems. When the area of ​​the production plant (Fab) cannot meet the area requirements of the chemical supply station, a separate chemical supply plant (CCSS) needs to be set up. Chemicals are transported from the chemical supply plant to the production plant through outdoor pipelines.

[0003] In the prior art, the outer wall of the outdoor transport pipeline is usually wrapped with an insulation layer to ensure that the chemicals maintain a suitable temperature (20-26° C.) during the transportation process.

[0004] However, due to the limited thermal insulation effect of the insulation layer, in hot weather conditions, the temperature of chemicals will suddenly rise during the transportation process in outdoor pipelines, which will not only affect the subsequent product yield, but also cause safety problems. Summary of the invention

[0005] In view of the above analysis, the present invention aims to provide an outdoor chemical transportation pipeline under high temperature weather conditions to solve the problems in the prior art that high temperature affects the yield of subsequent products and the transportation process has poor safety under high temperature weather conditions.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions.

[0007] The present invention provides an outdoor chemical transportation pipeline under high temperature weather conditions, comprising a heat-insulating shell, a plurality of chemical pipelines and a plurality of cooling pipelines arranged in the heat-insulating shell, and a coolant supply unit for supplying coolant to the cooling pipelines. The chemical pipelines and the cooling pipelines are alternately arranged, and there are gaps between the chemical pipelines, the cooling pipelines and the heat-insulating shell.

[0008] Furthermore, the outdoor chemical transportation pipeline under the above-mentioned high temperature weather conditions also includes a leakage sensor arranged in the heat-insulating shell and located at the bottom of the heat-insulating shell.

[0009] Furthermore, the outdoor chemical delivery pipeline under the above-mentioned high temperature weather conditions also includes a leakage alarm connected to the leakage sensor;

[0010] If a leak occurs in the chemical pipeline, the chemical flows into the heat-insulating shell and contacts the leakage sensor. The leakage sensor sends a leakage signal to the leakage alarm, and the leakage alarm sounds an alarm.

[0011] Furthermore, a groove is provided at the bottom of the heat-insulating shell, and the leakage sensor is arranged in the groove.

[0012] Furthermore, along the length direction of the heat-insulating shell, the bottom shape of the groove is wavy.

[0013] Furthermore, the bottom of the groove includes a plurality of leakage collection sections connected in sequence along the chemical flow direction, the leakage collection sections include a lower slope and an upper slope connected in sequence along the chemical flow direction, and the leakage sensor is arranged at the connection between the upper slope and the lower slope.

[0014] Furthermore, the slopes of the upper and lower slopes are 2-5‰.

[0015] Furthermore, a drain port and a sealing cover buckled on the drain port are provided at the connection between the upper inclined surface and the lower inclined surface.

[0016] Furthermore, the distance between two adjacent leakage sensors is 20 to 35 m.

[0017] Furthermore, the heat-insulating shell includes a supporting shell and a heat-insulating layer wrapping the supporting shell.

[0018] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0019] A) The outdoor chemical transportation pipeline under high temperature weather conditions provided by the present invention does not adopt a method of directly wrapping the chemical pipeline with an insulation layer, but adopts a method of combining an insulation shell and a cooling pipeline to insulate and cool the chemical pipeline. It has a simple structure and can realize outdoor transportation of chemicals under high temperature weather conditions in a safer, more economical and effective manner.

[0020] B) The outdoor chemical transportation pipeline provided by the present invention in high temperature weather conditions can add a cooling pipeline. When the temperature of the chemical in the chemical pipeline exceeds the temperature threshold, the cooling liquid supply unit can be turned on to pass low-temperature liquid into the cooling pipeline to cool the chemical pipeline.

[0021] C) The outdoor chemical transportation pipeline provided by the present invention under high temperature weather conditions has gaps between the chemical pipeline, the cooling pipeline and the insulation shell. Since the thermal conductivity of air is relatively low, air insulation can be formed on the outer wall of the chemical pipeline. In this way, the outdoor transportation pipeline has multiple functions such as air insulation, insulation layer insulation and cooling pipeline cooling, so as to cope with the impact of high temperature weather on the temperature of chemicals.

[0022] D) The outdoor chemical transportation pipeline provided by the present invention in high temperature weather conditions has a gap between the chemical pipeline and the cooling pipeline, so that the cooling pipeline can cool the chemical pipeline more evenly.

[0023] E) The outdoor chemical transportation pipeline under high temperature weather conditions provided by the present invention divides the groove into multiple sections, and a leakage sensor is respectively arranged in each section. If a leakage occurs somewhere in the chemical pipeline, the operator can make a preliminary judgment on the leakage point based on the chemical pipeline position corresponding to the leakage sensor, so that the leakage point can be found more timely.

[0024] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are only for the purpose of illustrating specific embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0026] Figure 1 A schematic diagram of the structure of an outdoor chemical transportation pipeline under high temperature weather conditions provided by the first embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a heat-insulating shell in an outdoor chemical transportation pipeline under high-temperature weather conditions provided by the first embodiment of the present invention;

[0028] Figure 3 A schematic diagram of the shape of a groove in an outdoor chemical transportation pipeline under high temperature weather conditions provided by the first embodiment of the present invention;

[0029] Figure 4 A horizontal axial cross-sectional view of a chemical pipeline in an outdoor chemical transportation pipeline under high temperature weather conditions provided in the first embodiment of the present invention;

[0030] Figure 5 A vertical axial cross-sectional view of a chemical pipeline in an outdoor chemical transportation pipeline under high temperature weather conditions provided in Example 1 of the present invention.

[0031] Reference numerals:

[0032] 1-insulation shell; 101-groove plate; 102-flip cover; 2-chemical pipeline; 201-anti-corrosion layer; 202-inner tube; 203-outer tube; 204-thermal expansion and contraction ring; 205-contact sensor; 3-cooling pipeline; 4-leakage sensor; 5-groove; 501-lower slope; 502-upper slope. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0034] Embodiment 1

[0035] This embodiment provides an outdoor chemical transportation pipeline under high temperature weather conditions. Figure 1 , including a heat-insulating shell 1, a plurality of chemical pipelines 2 and a plurality of cooling pipelines 3 arranged in the heat-insulating shell 1, and a coolant supply unit for supplying coolant (for example, cooling water) to the cooling pipelines 3, the chemical pipelines 2 and the cooling pipelines 3 are alternately arranged, and there are gaps between the chemical pipelines 2, the cooling pipelines 3 and the heat-insulating shell 1.

[0036] Compared with the prior art, the outdoor chemical transportation pipeline under high temperature weather conditions provided in this embodiment does not adopt a method of directly wrapping the chemical pipeline with an insulation layer, but adopts a method of combining an insulation shell 1 and a cooling pipeline 3 to insulate and cool the chemical pipeline 2. It has a simple structure and can realize outdoor transportation of chemicals under high temperature weather conditions more safely, economically and effectively.

[0037] Specifically, on the one hand, by adding the cooling pipeline 3, when the temperature of the chemical in the chemical pipeline 2 exceeds the temperature threshold (for example, 30°C), the cooling liquid supply unit can be turned on to pass low-temperature liquid into the cooling pipeline 3 to cool the chemical pipeline 2.

[0038] On the other hand, there are gaps between the chemical pipeline 2, the cooling pipeline 3 and the insulation shell 1. Since the thermal conductivity of air is low, air insulation can be formed on the outer wall of the chemical pipeline 2. In this way, the above-mentioned outdoor transportation pipeline has multiple functions such as air insulation, insulation layer insulation and cooling of the cooling pipeline 3, so as to cope with the impact of high temperature weather on the temperature of chemicals.

[0039] On the other hand, since there is a gap between the chemical pipeline 2 and the cooling pipeline 3 , the cooling pipeline 3 can radiate and cool the chemical pipeline 2 , so that the cooling pipeline 3 can cool the chemical pipeline 2 more evenly.

[0040] Considering that the above-mentioned outdoor transportation pipeline needs to transport chemicals (for example, acids, alkalis, organic liquids and other chemicals) for a long time, the chemicals are usually corrosive, toxic, flammable and explosive liquids, which may cause corrosion and leakage of the outdoor transportation pipeline. Once a leakage occurs, it will cause serious property losses and even casualties. Therefore, the above-mentioned chemical outdoor transportation pipeline also includes a leakage sensor 4 (for example, a capacitive leakage sensor 4) disposed in the insulation shell 1 and located at the bottom of the insulation shell 1, and a leakage alarm connected to the leakage sensor 4. If a leak occurs in the chemical pipeline 2, the chemical will flow into the insulation shell 1 and contact the leakage sensor 4. The leakage sensor 4 sends a leakage signal to the leakage alarm, and the leakage alarm sounds an alarm according to the leakage signal.

[0041] In this way, the leakage of chemicals can be discovered in time by setting the leakage sensor 4 and the leakage alarm. It should be noted that, compared with the existing method of wrapping with an insulation layer, in this embodiment, there is a gap between the insulation layer and the chemical pipeline 2. Once the chemical leaks, it will flow directly to the leakage sensor 4 instead of flowing in the insulation layer, so that the leakage can be discovered in the first place.

[0042] It is worth noting that since the leakage sensor 4 cannot completely cover the entire chemical pipeline 2, in order to be able to use a limited leakage sensor 4 to monitor the entire chemical pipeline 2, a groove 5 is provided at the bottom of the above-mentioned insulation shell 1, and the leakage sensor 4 is arranged in the groove 5. In this way, since the groove 5 is the lowest point of the insulation shell 1, if the chemical leaks, it will flow to the groove 5 and come into contact with the leakage sensor 4.

[0043] In order to facilitate the collection of leaked liquid, the shape of the groove 5 is, for example, a wave-shaped bottom along the length direction of the heat-insulating shell 1, see Figure 3 That is to say, the bottom of the groove 5 includes a plurality of leakage collection sections connected in sequence along the flow direction of the chemical, and the leakage collection section includes a lower slope 501 and an upper slope 502 connected in sequence along the flow direction of the chemical. The leakage sensor 4 is arranged at the connection between the upper slope 502 and the lower slope 501, that is, at the lowest point of the leakage collection section.

[0044] In this way, the groove 5 is divided into multiple sections, and a leakage sensor is set in each section. If a leakage occurs somewhere in the chemical pipeline 2, the operator can make a preliminary judgment on the leakage point based on the position of the chemical pipeline 2 corresponding to the leakage sensor, so that the leakage point can be found more timely.

[0045] Exemplarily, the distance between two adjacent leakage sensors 4 is 20-35 m (eg, 20 m, 23 m, 26 m, 30 m, 33 m or 35 m).

[0046] In order to allow the chemicals to flow smoothly to the leakage sensor 4 and improve the leakage detection accuracy, illustratively, the slopes of the upper slope 502 and the lower slope 501 are 2-5‰ (eg, 3‰).

[0047] It is understandable that, in order to remove the leaking liquid in time, a drain port and a plugging cover buckled on the drain port are also provided at the connection between the upper inclined surface 502 and the lower inclined surface 501. In this way, once the leakage sensor 4 detects the leakage, the plugging cover can be opened, so that the leaking liquid can be removed from the heat-insulating housing 1 in time, and the leakage liquid is prevented from corroding other components.

[0048] As for the structure of the heat-insulating shell 1, specifically, it includes a supporting shell located at the inner layer and a heat-insulating layer (for example, plastic-rubber heat-insulating cotton) wrapping the supporting shell.

[0049] Since the insulation layer is easily damaged due to long-term exposure to outdoor environment, in order to facilitate the replacement of the insulation layer, the insulation layer includes a plurality of insulation sections connected in sequence along the flow direction of the chemical, and two adjacent insulation sections are detachably connected, for example, by buckles or bolts. In this way, during the replacement of the insulation layer, the damaged insulation section can be separated from the adjacent insulation section, and the damaged insulation section can be removed for replacement.

[0050] Exemplarily, the length of the above-mentioned insulation section is 1 to 2 m.

[0051] In order to facilitate the inspection and maintenance of the chemical pipeline 2 and the cooling pipeline 3, the structure of the support shell is specifically referred to as follows: Figure 2 , which includes a slot plate 101 and a flap 102 covering the slot of the slot plate 101, that is, the support shell adopts a split structure. In this way, when the chemical pipeline 2 and the cooling pipeline 3 need to be inspected, the insulation layer can be removed first, and then the flap 102 can be opened to expose the chemical pipeline 2 and the cooling pipeline 3, so that the operator can inspect more conveniently.

[0052] Specifically, the structure of the chemical pipeline 2 includes an anti-corrosion layer 201 and a thermal insulation layer sleeved on the outer wall of the anti-corrosion layer 201, wherein the anti-corrosion layer 201 includes a polytetrafluoroethylene layer (PFA layer) and a chlorinated polyvinyl chloride layer (CPVC layer) sleeved on the outer wall of the polytetrafluoroethylene layer. In this way, the anti-corrosion layer 201 is made of a material with good corrosion resistance, which can reduce the occurrence of leakage in the chemical pipeline 2.

[0053] In order to be able to further adjust the thermal insulation performance according to the temperature of the chemical pipeline 2, the structure of the thermal insulation layer, specifically, includes an inner cylinder 202 and an outer cylinder 203 sleeved outside the inner cylinder 202, there is a gap between the inner cylinder 202 and the outer cylinder 203, the gap serves as a cooling chamber, the cooling chamber is connected to the coolant supply unit, the outer wall of the inner cylinder 202 is provided with a thermal expansion and contraction ring 204, the inner wall of the outer cylinder 203 is provided with a contact sensor 205, the thermal expansion and contraction ring 204 corresponds to the position of the contact sensor 205, there is a tiny gap between the outer ring surface of the thermal expansion and contraction ring 204 and the contact sensor 205, the above-mentioned chemical outdoor transportation pipeline also includes a cooling controller connected to the contact sensor 205.

[0054] Exemplarily, the material of the thermal expansion and contraction ring 204 is selected from materials with a large thermal expansion coefficient such as Cu60Zn40, FeNi22Cr3, FeNi20Mn6, FeNi13Mn7 or Mn72Cr18Ni10 alloy, which are not described in detail again.

[0055] Thus, when the temperature of the chemical in the chemical pipeline 2 does not exceed the temperature threshold (for example, 30° C.), there is a small gap between the outer ring surface of the thermal expansion and contraction ring 204 and the contact sensor 205, and the inner tube 202 and the outer tube 203 are isolated from each other by air, so that the cooling cavity can form air insulation. Figure 4 .

[0056] When the temperature of the chemical in the chemical pipeline 2 exceeds the temperature threshold (for example, 30°C), the heat in the chemical will be transferred to the thermal expansion and contraction ring 204, so that the thickness of the thermal expansion and contraction ring 204 increases, and the outer ring surface of the thermal expansion and contraction ring 204 contacts the contact sensor 205. The contact sensor 205 sends an over-temperature signal to the cooling controller. The cooling controller controls the coolant supply unit to pass coolant into the cooling cavity and the cooling pipeline 3. The cooling cavity can directly cool the chemical through the inner cylinder 202, and the cooling pipeline 3 cools the chemical through the outer cylinder 203 and the inner cylinder 202. See Figure 5 .

[0057] In addition, when the temperature of the chemical in the chemical pipeline 2 exceeds a temperature threshold (eg, 30° C.), the thermal expansion and contraction ring 204 and the contact sensor 205 that are in contact with each other can also serve as a heat-conducting structure, thereby further improving the cooling effect of the cooling pipeline 3 on the chemical.

[0058] It should be noted that, through the specially structured insulation layer, in actual applications, in high temperature weather conditions, the outdoor chemical transportation pipeline of this embodiment can utilize the thermal expansion and contraction properties of the thermal expansion and contraction ring 204 according to the temperature of the chemicals, so that the thermal expansion and contraction ring 204 can be in contact with or not in contact with the contact sensor 205 at different temperatures, thereby enabling the cooling pipeline 3 and the cooling chamber to adjust the temperature of the chemicals without having to constantly pass the coolant into the cooling pipeline 3 and the cooling chamber.

[0059] It is worth noting that in order to ensure that the thermal expansion and contraction ring 204 and the contact sensor 205 do not hinder the flow of the coolant after contact, the structure of the thermal expansion and contraction ring 204, exemplarily, includes an outer ring and a plurality of connecting ribs, the outer ring is sleeved on the outer wall of the inner tube 202 and has a gap with the outer wall of the inner tube 202, one end of the connecting rib is fixedly connected to the outer ring, and the other end of the connecting rib is fixedly connected to the inner tube 202, and there is a gap between two adjacent connecting ribs, which serves as a flow path for the coolant.

[0060] In practical applications, for large-flow chemical transportation, the diameter of the chemical pipeline 2 will be very large. During the chemical transportation process, there may be a problem of uneven internal temperature, that is, the temperature near the wall of the chemical pipeline 2 is higher, and the temperature in the middle of the chemical pipeline 2 is lower. If only the temperature near the wall of the chemical pipeline 2 exceeds the threshold, there is actually no need to open the coolant supply unit. In order to improve the temperature uniformity of the chemicals in the chemical pipeline 2, the inner cylinder 202 is provided with a plurality of spacers, which are arranged in sequence along the axial direction of the chemical pipeline 2, and the projections of the plurality of spacers on the radial plane of the chemical pipeline 2 do not overlap. In this way, by setting a plurality of spacers, the disturbance of the chemicals during transportation can be increased, and the temperature uniformity of the chemicals in the chemical pipeline 2 can be improved.

[0061] From the perspective of processing and structural simplification, illustratively, the number of spacers is two, one of which is arranged in the vertical direction and the other is arranged in the horizontal direction, that is, the projections of the two spacers on the radial plane of the chemical pipeline 2 are perpendicular to each other. In this way, on the one hand, by limiting the number of spacers, the inner cylinder 202 can be effectively simplified and the processing difficulty of the inner cylinder 202 can be reduced; on the other hand, by limiting the relative angles of the two spacers, the maximum disturbance of the chemicals can be achieved on the basis of using two spacers, thereby further improving the temperature uniformity of the chemicals in the chemical pipeline 2.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An outdoor chemical transportation pipeline under high temperature weather conditions, characterized in that: It includes a heat-insulating shell, a plurality of chemical pipelines and a plurality of cooling pipelines arranged in the heat-insulating shell, and a coolant supply unit for supplying coolant to the cooling pipelines. The chemical pipelines and the cooling pipelines are alternately arranged, and there are gaps between the chemical pipelines, the cooling pipelines and the heat-insulating shell.

2. The outdoor chemical transportation pipeline under high temperature weather conditions according to claim 1 is characterized in that: The device also includes a leakage sensor which is arranged in the heat-insulating shell and located at the bottom of the heat-insulating shell.

3. The outdoor chemical transportation pipeline under high temperature weather conditions according to claim 2 is characterized in that: Also included is a leak alarm connected to the leak sensor; If a chemical pipeline leaks, the chemical flows into the heat-insulating shell and contacts the leakage sensor. The leakage sensor sends a leakage signal to the leakage alarm, and the leakage alarm sounds an alarm.

4. The outdoor chemical transportation pipeline under high temperature weather conditions according to claim 2 is characterized in that: The bottom of the heat-insulating shell is provided with a groove, and the leakage sensor is arranged in the groove.

5. The outdoor chemical transportation pipeline in high temperature weather conditions according to claim 4 is characterized in that: Along the length direction of the heat-insulating shell, the bottom shape of the groove is wave-shaped.

6. The outdoor chemical transportation pipeline in high temperature weather conditions according to claim 5, characterized in that: The bottom of the groove includes a plurality of leakage collection sections connected in sequence along the chemical flow direction, the leakage collection sections include a lower slope and an upper slope connected in sequence along the chemical flow direction, and the leakage sensor is arranged at the connection between the upper slope and the lower slope.

7. The outdoor chemical transportation pipeline in high temperature weather conditions according to claim 6 is characterized in that: The slopes of the upper and lower slopes are 2-5‰.

8. The outdoor chemical transportation pipeline in high temperature weather conditions according to claim 6 is characterized in that: A liquid discharge port and a sealing cover buckled on the liquid discharge port are also provided at the connection between the upper inclined surface and the lower inclined surface.

9. The outdoor chemical transportation pipeline in high temperature weather conditions according to claim 2, characterized in that: The distance between two adjacent leakage sensors is 20 to 35 meters.

10. The outdoor chemical transportation pipeline under high temperature weather conditions according to any one of claims 1 to 9, characterized in that: The heat-insulating shell comprises a supporting shell and a heat-insulating layer wrapping the supporting shell.

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