A method of installing a shut-off valve in a crude benzol transfer system

Abstract

The application discloses a method for installing a cut-off valve of a crude benzol conveying system, and provides a nitrogen blowing component, a water injection component and the cut-off valve, and comprises the following steps: step S10, stopping conveying crude benzol into a conveying pipe and determining a pipe section of the conveying pipe where the cut-off valve needs to be installed, so as to obtain an installation pipe section; step S20, using the nitrogen blowing component to blow nitrogen into the installation pipe section, the blowing time of the nitrogen being T1, so as to discharge the crude benzol remaining in the installation pipe section through the nitrogen, and then using the water injection component to inject water into the installation pipe section, the water injection time being T2, so as to discharge the crude benzol remaining in the installation pipe section through the flowing water; and step S30, cutting the installation pipe section, and installing the cut-off valve at a cut-off position of the installation pipe section. The method for installing the cut-off valve of the crude benzol conveying system is convenient for installing the cut-off valve on the conveying pipe, and is high in safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of crude benzene production, and particularly relates to a method for installing a cut-off valve of a crude benzene conveying system. BACKGROUND

[0002] Crude benzene is one of the products in the crude coal gas generated by coal pyrolysis, and is mainly benzene after the benzene series compounds are recovered from the coke oven gas after ammonia removal, and has a light yellow color.

[0003] Generally, the crude benzene produced by a crude benzene production system is conveyed to a crude benzene storage tank through a crude benzene conveying system, and the crude benzene in the crude benzene storage tank is output to a transport vehicle, the crude benzene storage tank is arranged in an oil depot and is used for storing the crude benzene. The crude benzene conveying system comprises a crude benzene input mechanism and a crude benzene output mechanism, the crude benzene input mechanism is used for inputting the crude benzene output from the crude benzene production system to the crude benzene storage tank, and the crude benzene output mechanism is used for outputting the crude benzene in the crude benzene storage tank to the transport vehicle, and the transport vehicle is used for transporting the crude benzene to a user.

[0004] In the prior art, the crude benzene input mechanism comprises a crude benzene intermediate tank and a first conveying pipe, the crude benzene intermediate tank is communicated with the crude benzene storage tank through the first conveying pipe, an input pump is arranged on the first conveying pipe, when the crude benzene in the crude benzene storage tank reaches a set height, the input pump is started to pump the crude benzene in the crude benzene intermediate tank into the crude benzene storage tank; the crude benzene output mechanism comprises a loading component and a second conveying pipe, the loading component is communicated with the crude benzene storage tank through the second conveying pipe, an output pump is arranged on the second conveying pipe, and the output pump is started to output the crude benzene in the crude benzene storage tank to the loading component through the second conveying pipe for loading. In the prior art, only a switch valve is arranged on the conveying pipe in the crude benzene input mechanism and the crude benzene output mechanism, the reliability of the switch valve is low, and there is a great safety hazard, therefore, it is necessary to install a cut-off valve on the conveying pipe, however, the crude benzene is flammable and has a risk of burning and explosion when meeting a bright fire or high temperature, and there is a great safety hazard in cutting the conveying pipe and welding the cut-off valve. SUMMARY

[0005] The purpose of the present application is to provide a method for installing a cut-off valve of a crude benzene conveying system, which is convenient to install the cut-off valve on the conveying pipe and has high safety.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] The present application provides a method for installing a cut-off valve of a crude benzene conveying system, which comprises a nitrogen gas purging component, a water injection component and the cut-off valve, and comprises the following steps:

[0008] Step S10, stopping conveying the crude benzene into the conveying pipe and determining a pipe section on the conveying pipe which needs to be installed with the cut-off valve, to obtain an installation pipe section;

[0009] Step S20, using the nitrogen purging component to purge nitrogen into the installation pipe segment, the purging time of nitrogen is T1, to discharge the residual crude benzene in the installation pipe segment by nitrogen, then using the water injection component to inject water into the installation pipe segment, the injection time of water is T2, to discharge the residual crude benzene in the installation pipe segment by water flow;

[0010] Step S30, cutting the installation pipe segment, and installing the cut valve at the cut position of the installation pipe segment.

[0011] As a preferred solution of the cut valve installation method of the crude benzene conveying system, T1 is 0.5-1h.

[0012] As a preferred solution of the cut valve installation method of the crude benzene conveying system, T2 is 0.5-1h.

[0013] As a preferred solution of the cut valve installation method of the crude benzene conveying system, in the step S20, the pressure of the nitrogen purging component purging nitrogen into the installation pipe segment is P1, P1 is 0.5-1Mpa.

[0014] As a preferred solution of the cut valve installation method of the crude benzene conveying system, in the step S20, the pressure of the water injection component injecting water into the installation pipe segment is P2, P1 is 0.4-0.6Mpa.

[0015] As a preferred solution of the cut valve installation method of the crude benzene conveying system, in the step S20, the nitrogen and water flow are both introduced into the containing groove.

[0016] As a preferred solution of the cut valve installation method of the crude benzene conveying system, a vent pipe is provided, in the step S20, the nitrogen in the installation pipe segment and the water flow are introduced into the containing groove through the vent pipe.

[0017] As a preferred solution of the cut valve installation method of the crude benzene conveying system, a buffer groove and a connecting head connected with the buffer groove are provided, the buffer groove is provided with an observation area, through which the inside of the buffer groove can be observed, the connecting head is extended into the containing groove at the end far from the buffer groove, the output end of the vent pipe is extended into the buffer groove, before cutting the installation pipe segment, the color of the liquid discharged by the vent pipe is observed through the observation area, to determine whether the crude benzene in the installation pipe segment is discharged completely, if the crude benzene in the installation pipe segment is discharged completely, the installation pipe segment is cut, if the crude benzene in the installation pipe segment is not discharged completely, the step S20 is repeated.

[0018] As a preferred solution of the installation method of the cut-off valve of the crude benzene conveying system, several fireproof plates are provided, before the step S30, the communication positions of the installation pipe section and the crude benzene storage tank, the crude benzene intermediate tank and / or the loading part in the crude benzene conveying system are blocked by using the fireproof plates, and after the welding of the cut-off valve is completed, all the fireproof plates are removed.

[0019] As a preferred solution of the installation method of the cut-off valve of the crude benzene conveying system, before the step S10, the crude benzene in the crude benzene intermediate tank in the crude benzene conveying system is emptied to a set height position.

[0020] The beneficial effects of the present application are that after the crude benzene conveying into the conveying pipe is stopped, the nitrogen gas is blown into the installation pipe section by using the nitrogen gas blowing part, most of the crude benzene in the installation pipe section is discharged out of the installation pipe section by using the nitrogen gas, and then the flowing water is injected into the installation pipe section by using the water injection part, in the process that the flowing water flows out of the installation pipe section, the residual crude benzene in the installation pipe section is also discharged out of the installation pipe section along with the flowing water, so that the crude benzene in the installation pipe section is completely discharged clean, the residual crude benzene in the installation pipe section does not affect the subsequent cutting operation and welding operation of the installation pipe section, and the safety of cutting the installation pipe section and welding the cut-off valve is improved, and the cut-off valve is conveniently installed on the conveying pipe. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described in detail below according to the drawings and embodiments.

[0022] Figure 1 The installation method of the cut-off valve of the crude benzene conveying system of the first embodiment of the present application is shown in the figure.

[0023] Figure 2 The installation method of the cut-off valve of the crude benzene conveying system of the second embodiment of the present application is shown in the figure.

[0024] In the figure:

[0025] 11, first conveying pipe; 1101, installation pipe section; 1012, branch pipe; 12, nitrogen gas blowing part; 1201, nitrogen gas input pipe; 1202, nitrogen gas pump; 1203, nitrogen gas pipe; 13, water injection part; 1301, water pipe; 14, crude benzene emptying tank; 15, fireproof plate; 16, first pump; 17, first on-off valve; 18, second on-off valve; 19, third on-off valve; 110, first regulating valve; 112, second regulating valve; 113, crude benzene intermediate tank; 114, emptying pipe; 115, buffer tank; 116, connecting head; 117, final cooling oil emptying tank; 100, crude benzene storage tank;

[0026] 21. Second delivery pipe; 2011. Installation pipe section; 2012. Branch pipe; 22. Nitrogen purging component; 2201. Nitrogen input pipe; 2202. Nitrogen pump; 2203. Nitrogen pipe; 23. Water injection component; 2301. Water pipe; 24. Benzene venting tank; 25. Fireproof board; 26. Second pump; 27. Fourth switch valve; 28. Fifth switch valve; 29. ​​Sixth switch valve; 210. Third regulating valve; 220. Connecting pipe; 200. Crude benzene storage tank; 300. Loading component. Detailed Implementation

[0027] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 mechanical connection or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The crude benzene conveying system includes a crude benzene input mechanism and a crude benzene output mechanism. The crude benzene input mechanism is used to input the crude benzene in the crude benzene intermediate tank into the crude benzene storage tank for storage. The crude benzene output mechanism is used to output the crude benzene in the crude benzene storage tank into the loading component, and the crude benzene is transported to the vehicle through the loading component.

[0030] Example 1:

[0031] like Figure 1 As shown, the crude benzene input mechanism includes a crude benzene intermediate tank 113 and a first conveying pipe 11. The crude benzene intermediate tank 113 is connected to the crude benzene storage tank 100 through the first conveying pipe 11. A first pump assembly is provided on the first conveying pipe 11. The first pump assembly includes two first pumps 16 connected in parallel. Each first pump 16 has a first switching valve 17 connected to its opposite ends. The crude benzene in the crude benzene intermediate tank 113 can be drawn into the crude benzene storage tank 100 through the first pumps 16.

[0032] The present invention provides a method for installing a shut-off valve in a crude benzene conveying system, comprising a nitrogen purging component 12, a water injection component 13, and a shut-off valve, including the following steps:

[0033] Step S10, stop conveying crude benzene into the first conveying pipe 11, and determine the pipe section on which the cut-off valve needs to be installed, to obtain the installation pipe section 1101. In the embodiment, the crude benzene storage tank 100 has two, the two crude benzene storage tanks 100 are distributed at intervals, and the first conveying pipe 11 is connected to the two crude benzene storage tanks 100 through two branch pipes 1012 away from one end of the crude benzene intermediate tank 113. The second switch valve 18 is arranged on the branch pipe 1012, and the installation pipe section 1101 is the pipe section between the first pump assembly and the branch pipe 1012.

[0034] Step S20, use the nitrogen blowing component 12 to blow nitrogen into the installation pipe section 1101, the blowing time of the nitrogen is T1, so as to discharge the crude benzene remaining in the installation pipe section 1101 through the nitrogen, and then use the water injection component 13 to inject water into the installation pipe section 1101, the injection time of the water is T2, so as to discharge the crude benzene remaining in the installation pipe section 1101 through the flowing water;

[0035] Step S30, cut the installation pipe section 1101, and install the cut-off valve at the cut-off position of the installation pipe section 1101. During the process of cutting the installation pipe section 1101, water is sprayed to the cut-off position of the installation pipe section 1101 to cool the cutting position and prevent the cutting position from catching fire and causing combustion.

[0036] After stopping conveying crude benzene into the first conveying pipe 11, nitrogen is blown into the installation pipe section 1101 using the nitrogen blowing component 12, most of the crude benzene in the installation pipe section 1101 is discharged out of the installation pipe section 1101 through the nitrogen, and then flowing water is injected into the installation pipe section 1101 using the water injection component 13. During the process of flowing out of the installation pipe section 1101, the crude benzene remaining in the installation pipe section 1101 is also discharged out of the installation pipe section 1101 with the flowing water, so that the crude benzene in the installation pipe section 1101 is completely discharged, preventing the crude benzene remaining in the installation pipe section 1101 from affecting the subsequent cutting operation and welding operation of the installation pipe section 1101, thereby improving the safety of cutting the installation pipe section 1101 and welding the cut-off valve, and facilitating the installation of the cut-off valve on the first conveying pipe 11.

[0037] It can be understood that, in order to maintain the pressure of the crude benzene storage tank 100, prevent the internal pressure of the crude benzene storage tank 100 from dropping and cause the phenomenon of crude benzene backflow, the crude benzene storage tank 100 is generally also connected with a nitrogen purging component 12, nitrogen can be introduced into the crude benzene storage tank 100 through the nitrogen purging component 12, the nitrogen purging component 12 is connected with the two second switch valves 18 away from the crude benzene storage tank 100 through two nitrogen input pipes 1201, so that the first conveying pipe 11 and the crude benzene storage tank 100 share one nitrogen purging component 12, which saves equipment cost. The water injection component 13 includes a water injection pipe 1301, and the water injection pipe 1301 is connected with the part of the branch pipe 1012 located between the mounting pipe section 1101 and the second switch valve 18. After the second switch valve 18 is closed, the nitrogen input pipe 1201 can input nitrogen into the first conveying pipe 11, and the water injection pipe 1301 can inject water into the first conveying pipe 11, so that the gas flow and the water flow can flow away from the crude benzene storage tank 100.

[0038] The nitrogen purging component includes a nitrogen pump 1202 and a nitrogen pipe 1203, the nitrogen pump 1202 is arranged on the nitrogen pipe 1203, and the two nitrogen input pipes 1201 are connected with the nitrogen pipe 1203 through pipe joints.

[0039] In order to facilitate the adjustment of the flow of nitrogen and water falling into the mounting pipe, in the example, a first adjusting valve 110 is arranged on the nitrogen input pipe, and a second adjusting valve 111 is arranged on the water pipe, and the flow of nitrogen or water can be adjusted through the adjusting valves.

[0040] T1 is 0.5-1h. T1 can be 0.5h, 0.6h, 0.7h, 0.8h, 0.9h or 1h. In the embodiment, T1 is 1h.

[0041] T2 is 0.5-1h. T2 can be 0.5h, 0.6h, 0.7h, 0.8h, 0.9h or 1h. In the embodiment, T2 is 1h.

[0042] In step S20, the nitrogen purging component 12 purges nitrogen into the mounting pipe section 1101 at a pressure P1, and P1 is 0.5-1Mpa. By setting P1 in this range, it can be ensured that the nitrogen has sufficient driving force to drive the crude benzene remaining in the mounting pipe section 1101 to be discharged. P1 can be 0.5Mpa, 0.6Mpa, 0.7Mpa, 0.8Mpa, 0.9Mpa or 1Mpa. In the example, P1 is 1Mpa.

[0043] In step S20, the water injection component 13 injects water into the installation pipe section 1101 at a pressure of P2, and P1 is 0.4-0.6 MPa. P2 can be 0.4 MPa, 0.45 MPa, 0.5 MPa, 0.55 MPa, or 0.6 MPa. In this example, P2 is 0.5 MPa.

[0044] In step S20, the nitrogen and water flow are both introduced into the containing tank. In this example, the nitrogen and water flow are both introduced into the crude benzene vent tank 14, which is a component of a crude benzene recovery system connected to the crude benzene production system. The crude benzene vent tank 14 is used as the containing tank, so that the crude benzene remaining in the installation pipe section 1101 can be output to the crude benzene vent tank 14 along with the gas flow and water flow, so that the output crude benzene can be recovered.

[0045] In actual implementation, the crude benzene vent tank 14 can be in communication with the final cooling oil vent tank 117, the final cooling spray liquid intermediate tank, and the benzene washing tower, so that the crude benzene in the crude benzene vent tank 14 can be output to the final cooling oil vent tank, the final cooling spray liquid intermediate tank, and the benzene washing tower.

[0046] The crude benzene delivery system also provides a vent pipe 114 for installing a valve, and in step S20, the nitrogen and water flow in the installation pipe section 1101 are introduced into the containing tank through the vent pipe 114. In this example, the containing tank is the crude benzene vent tank 14. Specifically, one end of the vent pipe 114 is connected to the first delivery pipe 11 at a position between one of the first pumps 16 and a first switch valve 17 connected to the first pump 16. When the nitrogen and water are injected, the first switch valve 17 is kept open, and the other three first switch valves 17 are kept closed, so that the nitrogen flow and water flow can be output from one end of the installation pipe section 1101 to the crude benzene vent tank 14, thereby outputting the crude benzene remaining in the installation pipe section 1101.

[0047] Specifically, the cutting valve installation method of the crude benzene conveying system further provides that the buffer tank 115 is provided with an observation area through which the inside of the buffer tank 115 can be observed, one end of the connecting head 116 away from the buffer tank 115 extends into the crude benzene emptying tank 14, and the output end of the emptying pipe 114 extends into the buffer tank 115. Before cutting the installation pipe section 1101, the color of the liquid discharged by the emptying pipe 114 is observed through the observation area to determine whether the crude benzene in the installation pipe section 1101 is completely discharged. If the crude benzene in the installation pipe section 1101 is completely discharged, the installation pipe section 1101 is cut. If the crude benzene in the installation pipe section 1101 is not completely discharged, the step S20 is repeated. The emptying pipe 114 communicates with the crude benzene emptying tank 14 through the buffer tank 115 and the connecting head 116. The liquid discharged by the emptying pipe 114 is discharged into the buffer tank 115 and then discharged into the crude benzene emptying tank 14 through the connecting head 116. Since the crude benzene is a light yellow liquid, the operator can observe the color of the liquid discharged by the emptying pipe 114 into the buffer tank 115 through the observation area. When the liquid discharged by the emptying pipe 114 into the buffer tank 115 is colorless, it indicates that the crude benzene in the installation pipe section 1101 is completely discharged. When the liquid discharged by the emptying pipe 114 into the buffer tank 115 is light yellow, it indicates that the crude benzene in the installation pipe section 1101 is not completely discharged.

[0048] In the example, the buffer tank 115 is funnel-shaped.

[0049] If the crude benzene in the installation pipe section 1101 is not completely discharged, cutting the installation pipe section 1101 or welding the cutting valve at the cutting position of the installation pipe section 1101 can easily cause the residual crude benzene in the installation pipe section 1101 to ignite. To further improve safety, the cutting valve installation method of the crude benzene conveying system further provides a plurality of fireproof plates 15. Before the step S30, the fireproof plates 15 are used to block the communication part between the installation pipe section 1101 and the crude benzene storage tank and the crude benzene intermediate tank 113. After the welding of the cutting valve is completed, all the fireproof plates 15 are removed. Even if the residual crude benzene in the installation pipe section 1101 ignites, the fire can be effectively blocked by the fireproof plates 15, preventing the fire from spreading along the first conveying pipe 11 to the crude benzene intermediate tank 113 and the crude benzene storage tank 100.

[0050] It can be understood that the pipe joints of the first conveying pipe 11, the installation positions of the on-off valves, and the installation positions of the pumps are all provided with flange assemblies. The fireproof plates 15 are blind plates. The fireproof plates 15 are clamped between two flange plates of the same flange assembly by flange bolts to achieve locking of the fireproof plates 15.

[0051] For example, the first conveying pipe 11 is connected with the crude benzene storage tank 100 through an input pipe, the first conveying pipe 11 is connected with the input pipe of the crude benzene storage tank 100 through a flange assembly, the fireproof plate 15 is clamped in the flange assembly between the first conveying pipe 11 and the input pipe, and the fireproof plate 15 is locked between the two flange plates of the flange assembly through flange bolts.

[0052] The first switch valve 17 and the first pump 16 are both connected with the first conveying pipe 11 through flange assemblies, and in actual implementation, the fireproof plate 15 is arranged at one end of the first switch valve 17 which is not connected with the vent pipe 114, and the fireproof plate 15 is arranged on the part of the first conveying pipe 11 between the vent pipe 114 and the first pump 16.

[0053] In actual implementation, the third switch valve 19 is connected in parallel between the two first pumps 16, and the fireproof plate 15 is arranged at one end of the first switch valve 17 which is away from the crude benzene intermediate tank 113.

[0054] It can be understood that the crude benzene production is continuous and cannot be stopped, otherwise, serious economic losses will be caused, therefore, during the period of stopping the crude benzene from being conveyed into the first conveying pipe 11, the crude benzene discharged by the production system is discharged into the crude benzene intermediate tank 113, in order to ensure that the crude benzene in the crude benzene intermediate tank 113 of the crude benzene conveying system overflows when the cut-off valve is installed, the crude benzene in the crude benzene intermediate tank 113 is vented to a set height position, the set height position is artificially set according to the time required for installing the cut-off valve, and it is ensured that the crude benzene intermediate tank 113 has enough space to accommodate the crude benzene discharged by the crude benzene system when the cut-off valve is installed.

[0055] In the embodiment, the crude benzene in the crude benzene intermediate tank 113 is vented to 250 mm before step S10, and of course, the set height position can be flexibly designed in actual implementation.

[0056] Embodiment two:

[0057] With reference to Figure 2 The crude benzene output mechanism comprises a crude benzene loading component 300 and a second conveying pipe 21, the crude benzene loading component 300 is connected with the crude benzene storage tank 200 through the second conveying pipe 21, the second conveying pipe 21 is provided with a second pump assembly, the second pump assembly comprises two second pumps 26, the two second pumps 26 are connected in parallel, and each second pump 26 is connected with a fourth switch valve 27 at opposite ends, the crude benzene in the crude benzene storage tank 200 can be pumped out to the loading component 300 through the second pump 26, and the loading component 300 can convey the crude benzene to a vehicle.

[0058] The embodiment provides a cut-off valve installation method of a crude benzene conveying system, the cut-off valve installation method of the crude benzene conveying system is provided with a nitrogen blowing component 22, a water injection component 23 and a cut-off valve, and comprises the following steps.

[0059] Step S10, stop feeding the crude benzene into the second conveying pipe 21 and determine the pipe section of the second conveying pipe 21 on which the cut-off valve needs to be installed, to obtain an installation pipe section 2011. The crude benzene storage tank 200 includes two, and the second conveying pipe 21 is connected with the two crude benzene storage tanks 200 through two branch pipes 2012, and the installation pipe section 2011 is the position of the second conveying pipe 21 between the branch pipe 2012 and the second pump assembly.

[0060] Step S20, use the nitrogen blowing component 22 to blow nitrogen into the installation pipe section 2011, the blowing time of the nitrogen is T1, to discharge the residual crude benzene in the installation pipe section 2011 by the nitrogen, and then use the water injection component 23 to inject water into the installation pipe section 2011, the injection time of the water is T2, to discharge the residual crude benzene in the installation pipe section 2011 by the flowing water. It can be understood that, in order to maintain the pressure of the crude benzene storage tank 200 and prevent the phenomenon of back suction of the crude benzene storage tank 200 due to the decrease of the internal pressure, the crude benzene storage tank 200 is generally also connected with the nitrogen blowing component 22, and the nitrogen blowing component 22 is connected with the crude benzene storage tank 200 through the nitrogen input pipe 2201. The water injection component 23 includes a water pipe 2301, and the nitrogen input pipe 2201 and the water pipe 2301 are respectively connected with one of the branch pipes 2012.

[0061] The nitrogen blowing component includes a nitrogen pump 2202 and a nitrogen pipe 2203, and the nitrogen pump 1202 is arranged on the nitrogen pipe 2203. The two nitrogen input pipes 2201 are connected with the nitrogen pipe 2203 through pipe joints.

[0062] In order to facilitate the adjustment of the flow of nitrogen and water falling into the installation pipe, in the example, a third adjusting valve 210 is arranged on the nitrogen input pipe, and a fourth adjusting valve (not shown in the figure) is arranged on the water pipe, and the flow of nitrogen or water can be adjusted through the adjusting valve.

[0063] Step S30, cut the installation pipe section 2011, and install the cut-off valve at the cut-off position of the installation pipe section 2011. During the process of cutting the installation pipe section 2011, water is sprayed at the cut-off position of the installation pipe section 2011 to cool the cutting position and prevent the cutting position from catching fire and causing combustion.

[0064] After the crude benzene is stopped to be transported into the second conveying pipe 21, the nitrogen blowing part 22 is used to blow nitrogen into the inside of the installation pipe section 2011, most of the crude benzene in the inside of the installation pipe section 2011 is discharged out of the installation pipe section 2011 by the nitrogen, then the water injection part 23 is used to inject flowing water into the inside of the installation pipe section 2011, in the process of the flowing water flowing out of the installation pipe section 2011, the crude benzene remaining in the inside of the installation pipe section 2011 is also discharged out of the installation pipe section 2011 along with the flowing water, so that the crude benzene in the inside of the installation pipe section 2011 is completely discharged clean, the residual crude benzene in the inside of the installation pipe section 2011 does not affect the subsequent cutting operation and welding operation of the installation pipe section 2011, so that the safety of cutting the installation pipe section 2011 and welding the cutting valve is improved, and the cutting valve is conveniently installed on the second conveying pipe 21.

[0065] T1 is 0.5-1h. T1 can be 0.5h, 0.6h, 0.7h, 0.8h, 0.9h or 1h. In the embodiment, T1 is 1h.

[0066] T2 is 0.5-1h. T2 can be 0.5h, 0.6h, 0.7h, 0.8h, 0.9h or 1h. In the embodiment, T2 is 1h.

[0067] In step S20, the nitrogen blowing part 22 blows nitrogen into the inside of the installation pipe section 2011 at a pressure P1, and P1 is 0.5-1Mpa. By setting P1 in this range, it can be ensured that the nitrogen has sufficient driving force to drive the remaining crude benzene in the inside of the installation pipe section 2011 to be discharged. P1 can be 0.5Mpa, 0.6Mpa, 0.7Mpa, 0.8Mpa, 0.9Mpa or 1Mpa. In the embodiment, P1 is 1Mpa.

[0068] In step S20, the water injection part 23 injects water into the inside of the installation pipe section 2011 at a pressure P2, and P1 is 0.4-0.6Mpa. P2 can be 0.4Mpa, 0.45Mpa, 0.5Mpa, 0.55Mpa, 0.6Mpa. In the embodiment, P2 is 0.5Mpa.

[0069] In actual implementation, the second pump assembly is connected with the nitrogen blowing part 22, and in step S20, the nitrogen blowing part connected with the second pump assembly blows nitrogen into the inside of the second conveying pipe 21, so that the crude benzene near the two ends of the installation pipe section 2011 can also be completely discharged under the joint action of the two nitrogen blowing parts 22.

[0070] In step S20, nitrogen and water are flowed into the containing tank, and the benzene emptying tank 24 is used as the containing tank, so that the crude benzene remaining in the installation pipe section 2011 can be discharged to the benzene emptying tank 24 along with the gas flow and the water flow, so as to recover the discharged crude benzene. When the nitrogen is purged and the water is injected, the second conveying pipe 21 is communicated with the benzene emptying tank 24, so that the liquid discharged along with the gas flow and the water flow can be discharged into the benzene emptying tank 24, so as to facilitate the recovery of the discharged crude benzene. When the nitrogen purging and the water injection are completed, the pipeline between the benzene emptying tank 24 and the installation pipe section 2011 is closed. In the example, before the nitrogen is purged, the liquid level in the benzene emptying tank 2 is emptied to below 230 mm. In actual implementation, the liquid level in the benzene emptying tank 2 can be emptied to a high position according to the needs, so as to prevent the liquid in the benzene emptying tank 2 from overflowing.

[0071] The crude benzene conveying system further comprises a plurality of fireproof plates 25. Before step S30, the fireproof plates 25 are used to block the communication positions of the installation pipe section 2011, the crude benzene storage tank 200, and the loading component 300. After the installation of the cut-off valve is completed, all the fireproof plates 25 are removed. Even if the crude benzene remaining in the installation pipe section 2011 ignites, the fire can be effectively blocked by the fireproof plates 25, so as to prevent the fire from entering the intermediate tank and the crude benzene storage tank 200 along the pipeline.

[0072] It can be understood that the pipe joints of the second conveying pipe 21, the installation positions of the on-off valves, and the installation positions of the pumps are all provided with flange assemblies. The fireproof plates 25 are clamped between two flange plates of the same flange assembly by flange bolts, so as to lock the fireproof plates 25.

[0073] In the embodiment, the two second pumps 26 are blocked by fireproof plates 25 at one end of the fourth on-off valve 27 close to the crude benzene storage tank 200. A fifth on-off valve 28 is connected in parallel between the two second pumps 26, and one end of the fifth on-off valve 28 is blocked by a fireproof plate 25.

[0074] Each branch pipe 2012 is connected with the crude benzene storage tank 200 through two communication pipes 220, and at least one fireproof plate 25 is blocked on each communication pipe 220.

[0075] When the cut-off valve is installed, in order to prevent the flame in the installation pipe section 2011 from extending into the benzene emptying tank, when the nitrogen purging and the water injection are completed, the pipeline between the benzene emptying tank 24 and the installation pipe section 2011 is closed, and the pipeline between the benzene emptying tank 24 and the installation pipe section 2011 is blocked by the fireproof plate 25. Specifically, the sixth on-off valve 29 is arranged on the pipeline between the benzene emptying tank 24 and the installation pipe section 2011, and one end of the sixth on-off valve 29 is blocked by the fireproof plate 25.

[0076] In this embodiment, before step S10, the crude benzene in the crude benzene storage tank 200 is emptied to a set height position to prevent the crude benzene in the crude benzene storage tank 200 from overflowing during construction. In this example, the crude benzene in the crude benzene storage tank 200 is emptied to a position below 1500 mm. Of course, in actual implementation, the set height position can be designed flexibly.

[0077] In the description herein, it should be understood that the terms "upper", "lower", "left", "right", and the like orientation or position relationships are based on the orientation or position relationships shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", are only used to distinguish in the description, and do not have special meanings.

[0078] In the description of the present specification, the description referring to the terms "an embodiment", "an example", and the like 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 application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0079] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0080] The technical principles of the present application are described above in conjunction with specific embodiments. These descriptions are only for the purpose of explaining the principles of the present application, and cannot be interpreted in any way as a limitation on the scope of protection of the present application. Based on the explanations herein, those skilled in the art can think of other specific embodiments of the present application without having to exert creative effort, and these embodiments will fall within the scope of protection of the present application.

Claims

1. A method of installing a shut-off valve in a crude benzene transfer system, characterized by, The nitrogen blowing part, the water injection part and the cut-off valve are provided, and the method comprises the following steps: Step S10, stopping the crude benzene from being transported into the conveying pipe and determining the pipe section of the conveying pipe on which the cut-off valve needs to be installed, to obtain an installation pipe section; Step S20, using the nitrogen blowing part to blow nitrogen into the installation pipe section, the blowing time of the nitrogen being T1, so as to discharge the residual crude benzene in the installation pipe section by the nitrogen, and then using the water injection part to inject water into the installation pipe section, the injection time of the water being T2, so as to discharge the residual crude benzene in the installation pipe section by the flowing water; Step S30, cutting the installation pipe section and installing the cut-off valve at the cut-off position of the installation pipe section.

2. The method of installing a shut-off valve of a crude benzol transfer system according to claim 1, characterized in that, T1 is 0.5-1 h.

3. The method of installing a shut-off valve of a crude benzol transfer system according to claim 1, characterized in that, T2 is 0.5-1 h.

4. The cut-off valve installation method of the crude benzene conveying system according to claim 1, wherein in the step S20, the nitrogen blowing part blows nitrogen into the installation pipe section at a pressure P1, and P1 is 0.5-1 MPa.

5. The cut-off valve installation method of the crude benzene conveying system according to claim 1, wherein in the step S20, the water injection part injects water into the installation pipe section at a pressure P2, and P1 is 0.4-0.6 MPa.

6. The method of installing a shut-off valve of a crude benzol transfer system according to claim 1, wherein In the step S20, the nitrogen and the flowing water are both introduced into the containing tank.

7. The method of installing a shut-off valve of a crude benzol transfer system according to claim 6, characterized in that, A vent pipe is provided, and in the step S20, the nitrogen in the installation pipe section and the flowing water are introduced into the containing tank through the vent pipe.

8. The method of installing a shut-off valve of a crude benzol transfer system according to claim 7, characterized in that, A buffer tank and a connecting head connected with the buffer tank are provided, the buffer tank is provided with an observation area through which the inside of the buffer tank can be observed, and the connecting head extends into the containing tank at the end far from the buffer tank. The output end of the vent pipe extends into the buffer tank. Before the installation pipe section is cut, the color of the liquid discharged by the vent pipe is observed through the observation area to determine whether the crude benzene in the installation pipe section is completely discharged. If the crude benzene in the installation pipe section is completely discharged, the installation pipe section is cut. If the crude benzene in the installation pipe section is not completely discharged, the step S20 is repeated.

9. The method of installing a shut-off valve of a crude benzol transfer system according to any one of claims 1 to 8, characterized in that, A plurality of fireproof plates are provided. Before the step S30, the fireproof plates are used to block the communication positions of the installation pipe section and the crude benzene storage tank, the crude benzene intermediate tank and / or the loading part in the crude benzene conveying system. After the cut-off valve is welded, all the fireproof plates are removed.

10. The method of installing a shut-off valve of a crude benzol transfer system according to claim 1, wherein Before the step S10, the crude benzene in the crude benzene intermediate tank in the crude benzene conveying system is vented to a set height position.

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