Pre-hydrogenation intermittent water injection acidic water temporary storage and transfer system

Abstract

The invention relates to the technical field of petrochemical engineering pre-hydrogenation production, in particular to a pre-hydrogenation intermittent water injection acidic water temporary storage and transfer system, an acidic water storage tank is connected with a pre-hydrogenation production acidic water feeding pipeline, the tank bottom of the acidic water storage tank is connected with an acidic water delivery pipeline, and the acidic water delivery pipeline is provided with double valves; the acidic water leading-out pipeline is led out from an acidic water delivery pipeline between the double valves, the acidic water leading-out pipeline is connected into a reformed liquefied gas to aromatization pipeline, and the tank field liquefied gas pipeline is connected with the reformed liquefied gas to aromatization pipeline through a crossover line; and the bottom of the external acidic water storage tank is connected with a densely-arranged pipeline which is connected with an exposed-arranged pipeline. The acidic water storage tank and the external acidic water storage tank are arranged, a pipeline passage between the acidic water storage tank and the external acidic water storage tank is established, in the shutdown overhaul stage of the external receiving device, the acidic water is directionally conveyed to the external acidic water storage tank, and the storage bottleneck in the shutdown period is thoroughly solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum chemical pre-hydrogenation production, in particular to an acid water temporary storage and transfer system for pre-hydrogenation intermittent water injection. BACKGROUND

[0002] In the pre-hydrogenation production process, the pre-hydrogenation unit continuously produces acid water, which is usually sent to an external receiving device for subsequent processing. When the external receiving device enters the shutdown and maintenance stage, the acid water sending channel is interrupted, and the pre-hydrogenation unit needs to be switched to intermittent water injection mode, resulting in a sharp increase in temporary storage demand for acid water. The existing storage tank has insufficient storage capacity and cannot meet the acid water storage demand during shutdown, which may cause production interruption due to full tank of acid water. This affects the efficiency and safety of the equipment. The acid water contains high concentration of hydrogen sulfide, and if the storage and transportation system is not properly isolated, there is a risk of hydrogen sulfide entering other systems. SUMMARY

[0003] In view of the defects of the prior art, the present application provides an acid water temporary storage and transfer system for pre-hydrogenation intermittent water injection, which can solve the problem of insufficient acid water storage capacity during shutdown of the external receiving device, and can transfer and store the acid water without process, ensuring continuous and stable operation of the pre-hydrogenation unit.

[0004] To achieve the above purpose, the technical scheme provided by the present application is an acid water temporary storage and transfer system for pre-hydrogenation intermittent water injection, which comprises an acid water storage tank, an acid water outlet pipeline, a tank area liquefied gas pipeline, an external acid water storage tank, and a 2.0MPa nitrogen pipeline. The acid water storage tank is connected to the pre-hydrogenation production acid water inlet pipeline. The bottom of the acid water storage tank is connected to an acid water outlet pipeline, which is provided with a double valve. The acid water outlet pipeline is connected to the acid water outlet pipeline between the double valves. The acid water outlet pipeline is connected to the reforming liquefied gas to aromatization pipeline. The acid water outlet pipeline is connected to the outlet branch pipeline. The outlet branch pipeline is connected to the foam station backwater to condensate water tank pipeline. The tank area liquefied gas pipeline is connected to the reforming liquefied gas to aromatization pipeline through a cross-line. The bottom of the external acid water storage tank is connected to a dense pipeline. The dense pipeline is connected to an open pipeline. The open pipeline is connected to the tank area liquefied gas pipeline through a transfer pipeline. The first tank top exhaust interface of the external acid water storage tank is connected to the flare gas pipeline network through a first discharge pipeline. The 2.0MPa nitrogen pipeline is connected to the first tank top nitrogen interface of the external acid water storage tank through a nitrogen inlet pipeline.

[0005] Further, the second tank top nitrogen interface of the acid water storage tank is connected to a 0.46MPa nitrogen pipeline.

[0006] Further, the second tank top exhaust interface of the sour water storage tank is connected to the flare gas pipe network through a second discharge pipeline.

[0007] Further, a first valve and a second valve are arranged on the 2.0 MPa nitrogen pipeline along the nitrogen flow direction, and the 0.46 MPa nitrogen pipeline and the 2.0 MPa nitrogen pipeline meet downstream of the second valve.

[0008] Further, the sour water leading pipeline is provided with a third valve, a first guide valve and a first pressure gauge.

[0009] Further, a fourth valve is arranged on the leading branch pipeline.

[0010] Further, a fifth valve is arranged on the tank area liquefied gas pipeline, the cross line and the tank area liquefied gas pipeline meet downstream of the fifth valve, and the cross line is provided with a sixth valve, a second guide valve and a seventh valve.

[0011] Further, the sour water delivery pipeline is provided with a delivery pump, an oil dirt discharge tank pipeline is arranged on the sour water delivery pipeline downstream of the outlet of the delivery pump, the oil dirt discharge tank pipeline is provided with an eighth valve and a ninth valve, and the sour water delivery pipeline meets the oil dirt discharge tank pipeline between the eighth valve and the ninth valve through a discharge cross line.

[0012] Further, the discharge cross line is provided with a tenth valve.

[0013] Further, the discharge cross line branch pipeline is connected to the foam station backwater to condensate water tank pipeline downstream of the tenth valve on the discharge cross line, a hand valve is arranged on the foam station backwater to condensate water tank pipeline, the discharge cross line branch pipeline and the foam station backwater to condensate water tank pipeline meet upstream of the hand valve, and the discharge cross line branch pipeline is provided with an eleventh valve and a third guide valve.

[0014] The method for temporarily storing and transferring sour water by pre-hydrogenation intermittent water injection, before the external receiving device stops working, the liquid level of the sour water storage tank is reduced to 10%; after receiving the stop delivery instruction, the liquid level of the sour water storage tank is emptied, the delivery pump is stopped, and the control valve and the delivery pump inlet and outlet valves are closed; intermittent water injection is started, sour water transfer is carried out, when the liquid level of the sour water storage tank reaches 90%, the delivery pump is started to transfer the sour water to the external sour water storage tank through the sour water leading pipeline, the cross line, the tank area liquefied gas pipeline and the transfer pipeline; when the liquid level of the external sour water storage tank reaches 90%, the receiving is stopped, and the pressure of the external sour water storage tank is monitored, when the pressure reaches 0.1 MPa, it is immediately discharged to the flare gas pipe network; after the external receiving device resumes receiving, the process from the external sour water storage tank to the external receiving device is opened, the external sour water storage tank is pressurized to 1.0 MPa, and the sour water is sent to the external receiving device.

[0015] The beneficial effects of this invention are as follows: by setting up an acidic water storage tank and an external acidic water storage tank, and establishing a pipeline passage between the acidic water storage tank and the external acidic water storage tank, the acidic water can be directed to the external acidic water storage tank during the shutdown and maintenance phase of the external receiving device. The number of storage containers is increased and the storage capacity is increased, turning "insufficient" into "overcapacity", and completely solving the storage bottleneck during shutdown. Attached Figure Description

[0016] Figure 1 This is a process flow diagram of a temporary storage and transfer system for acidic water with pre-hydrogenated intermittent water injection, according to one embodiment of the present invention. In the picture: 100. Acidic water storage tank; 110. Pre-hydrogenation production acidic water feed pipeline; 120. Acidic water delivery pipeline; 121, 122. Dual valves; 123. Delivery pump; 124. Oil and sludge discharge tank pipeline; 1241. Eighth valve; 1242. Ninth valve; 125. External discharge cross-line; 1251. Tenth valve; 1252. External discharge cross-line branch pipeline; 1253. Eleventh valve; 1254. Third drain valve; 126. Control valve; 130. Second tank top nitrogen inlet; 140. Second tank top exhaust inlet; 141. Second discharge pipeline. 200. Acidic water outlet pipeline; 210. Outlet branch pipeline; 211. Fourth valve; 220. Third valve; 230. First drain valve; 240. First pressure gauge. 300. LPG pipeline in tank area; 310. Crossover; 311. Sixth valve; 312. Second drain valve; 313. Seventh valve; 320. Blind cover; 330. Twelfth valve. 400. External acidic water storage tank; 410. Closed-loop piping; 420. Open-loop piping; 421. Transfer piping; 430. Vent port on top of first tank; 431. First discharge pipeline; 4311. Check valve; 4312. Third drain; 4313. Second pressure gauge; 440. Nitrogen port on top of first tank; 450. Blind flange. 500, 2.0MPa nitrogen pipeline; 510, nitrogen inlet pipeline; 520, first valve; 530, second valve. 600. Reformed LPG to Aromatization Pipeline; 610. Blind Cover; 700. Foam station return water to condensate tank pipeline; 710. Manual valve; 800. Flare separator; 810. Tank outlet drain. 10. Flare gas pipeline network; 20. 0.46MPa nitrogen pipeline; 30. External receiving device. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] The existing technology only has a single function of conveying acidic water storage tank 100 to external receiving device 30 through acidic water delivery pipeline 120. When the external receiving device 30 is shut down, there is no pipeline design for directional conveying, gas phase discharge, pressure control and other functions for shutdown. After shutdown, acidic water cannot be transferred and gas phase in the tank cannot be safely discharged, which poses a risk of system pressure buildup.

[0019] See Figure 1 This diagram illustrates a process flow chart of a temporary storage and transfer system for pre-hydrogenated intermittent water injection of acidic water according to an embodiment of the present invention. The system includes an acidic water storage tank 100, an acidic water outlet pipeline 200, a liquefied gas pipeline 300 for the tank area, an external acidic water storage tank 400, and a 2.0 MPa nitrogen pipeline 500. The acidic water storage tank 100 is connected to the pre-hydrogenated acidic water feed pipeline 110. The bottom of the acidic water storage tank 100 is connected to… An acidic water delivery pipeline 120 is connected, and the acidic water delivery pipeline 120 is equipped with double valves 121 and 122; an acidic water outlet pipeline 200 is led out from the acidic water delivery pipeline 120 between the double valves 121 and 122, and the acidic water outlet pipeline 200 is connected to the reformed liquefied gas to aromatization pipeline 600. One end of the reformed liquefied gas to aromatization pipeline 600 is equipped with a blind cover 610, which can block upstream materials. Acid water outlet pipeline 200 is connected downstream of blind cover 610. Acid water outlet pipeline 200 is connected to outlet branch pipeline 210, which is connected to foam station return water to condensate tank pipeline 700. Tank area liquefied gas pipeline 300 is connected to reformed liquefied gas to aromatization pipeline 600 via cross line 310. The bottom of external acid water storage tank 400 is connected to densely packed pipeline 410, which is connected to open discharge pipeline 420. Open discharge pipeline 420 is connected to tank area liquefied gas pipeline 300 via transfer pipeline 421. The first tank top vent port 430 of external acid water storage tank 400 is connected to flare gas network 10 via first discharge pipeline 431. 2.0MPa nitrogen pipeline 500 is connected to the first tank top nitrogen port 440 of external acid water storage tank 400 via nitrogen inlet pipeline 510.

[0020] The aforementioned temporary storage and transfer system for pre-hydrogenated intermittently injected acidic water includes an acidic water storage tank 100 and an external acidic water storage tank 400. A pipeline connection is established between the acidic water storage tank 100 and the external acidic water storage tank 400. During the shutdown and maintenance phase of the external receiving device 30, acidic water is directed to the external acidic water storage tank 400. This increases the number of storage containers and storage capacity, transforming the situation from "insufficient" to "overcapacity," completely resolving the storage bottleneck during shutdowns. Furthermore, when the acidic water storage tank 100 requires maintenance or repair, the acidic water can be transferred to the external acidic water storage tank 400, avoiding disruption to normal production processes.

[0021] Process Flow Description: Before the external receiving device 30 is shut down, the level of the acidic water storage tank 100 is reduced to 10%. Upon receiving the stop-supply instruction, the level of the acidic water storage tank 100 is emptied, the external supply pump 123 is stopped, and the control valve 126 and the inlet and outlet valves of the external supply pump are closed. Intermittent water injection begins, switching to water injection once every 3 days, 10t each time (water injection rate 3t / h, duration approximately 3h). If the flame arresters of the F801 / F802 furnaces require frequent cleaning, the water injection rate can be increased or the water injection time extended. When the acid water transfer begins and the acid water storage tank 100 reaches 90% of its capacity, the external pump 123 is started to transfer the acid water through the acid water outlet pipeline 200, the cross-line 310, the tank area liquefied gas pipeline 300, and the transfer pipeline 421 to the external acid water storage tank 400. When the external acid water storage tank 400 reaches 90% of its capacity, the receiving is stopped, and the pressure of the external acid water storage tank 400 is monitored. When the pressure reaches 0.1 MPa, it is immediately discharged to the flare gas pipeline network 10. After the external receiving device 30 resumes receiving, the flow from the external acidic water storage tank 400 to the external receiving device 30 is opened. The external acidic water storage tank 400 is pressurized to 1.0 MPa. Specifically, nitrogen at 2.0 MPa is introduced through the nitrogen inlet pipeline 510 for pressurization. Acidic water is then sent to the external receiving device 30 from the transfer pipeline 421, the tank area liquefied gas pipeline 300, the cross line 310, and the acidic water outlet pipeline 200. It should be noted that the external acidic water storage tank 400 and the acidic water outlet pipeline 200, cross line 310, and transfer pipeline 421 added between the external acidic water storage tank 100 and the external acidic water storage tank 400 are only used during the shutdown period of the external receiving device 30. During production periods when acidic water transfer is not required, acidic water can be discharged to the external receiving device 30 via the acidic water delivery pipeline 120. At this time, the acidic water outlet pipeline 200, the cross-line 310, and the transfer pipeline 421 can be disconnected. The reformed liquefied gas to aromatization pipeline 600 and the tank farm liquefied gas pipeline 300 can all be transported in the original process.

[0022] In one embodiment, the nitrogen port 130 on the second tank top of the acidic water storage tank 100 is connected to the 0.46MPa nitrogen pipeline 20.

[0023] In one embodiment, the second tank top vent 140 of the acidic water storage tank 100 is connected to the flare gas network 10 via a second discharge line 141.

[0024] In one embodiment, a first valve 520 and a second valve 530 are provided on the 2.0MPa nitrogen pipeline 500 along the nitrogen flow direction, and the 0.46MPa nitrogen pipeline 20 and the 2.0MPa nitrogen pipeline 500 meet downstream of the second valve 530.

[0025] In one embodiment, the acidic water outlet pipeline 200 is equipped with a third valve 220, a first drain valve 230, and a first pressure gauge 240.

[0026] In one embodiment, a fourth valve 211 is provided on the branch line 210.

[0027] In one embodiment, a fifth valve 320 is provided on the liquefied gas pipeline 300 in the tank area, and a cross line 310 connects with the liquefied gas pipeline 300 in the tank area downstream of the fifth valve 320. The cross line 310 is provided with a sixth valve 311, a second drain valve 312 and a seventh valve 313.

[0028] In one embodiment, the acidic water delivery pipeline 120 is equipped with a delivery pump 123. An oil sludge tank pipeline 124 is provided upstream of the acidic water delivery pipeline 120 and downstream of the outlet of the delivery pump 123. The oil sludge tank pipeline 124 is equipped with an eighth valve 1241 and a ninth valve 1242. The acidic water delivery pipeline 120 and the oil sludge tank pipeline 124 meet between the eighth valve 1241 and the ninth valve 1242 via an external discharge cross-line 125.

[0029] In one embodiment, the outer drain line 125 is provided with a tenth valve 1251.

[0030] In one embodiment, the downstream of the tenth valve 1251 on the external discharge cross line 125 is connected to the foam station return water to condensate tank pipeline 700 via the external discharge cross line branch pipeline 1252. A manual valve 710 is installed on the foam station return water to condensate tank pipeline 700. The external discharge cross line branch pipeline 1252 and the foam station return water to condensate tank pipeline 700 meet upstream of the manual valve 710. An eleventh valve 1253 and a third drain valve 1254 are installed on the external discharge cross line branch pipeline 1252.

[0031] This modified system uses an external acidic water storage tank 400 as the core storage unit. Preferably, in one embodiment, the volume of the external acidic water storage tank 400 is 246.4 m³. Combined with the modification of four key pipelines, an integrated system of "storage-transportation-safety protection" is formed. The modification process specifically includes: Feed pipeline modification: To achieve directional delivery of acidic water to the external acidic water storage tank 400. An acidic water outlet pipeline 200 is drawn from a short section between the double valves 121 and 122 in the N1 boundary area of ​​the acidic water delivery pipeline 120, and connected to the reformed liquefied gas to aromatization pipeline 600 in the N1 boundary area. A third valve 220, a first drain valve 230, and a first pressure gauge 240 are added to the acidic water outlet pipeline 200. Specifically, in this embodiment, the third valve 220 is a gate valve DN50, PN5.0, the first drain valve 230 is a drain valve DN20, PN5.0, and the first pressure gauge 240 has a DN20, PN5.0 interface. A blind cover 320 is added to the side of the tank area liquefied gas pipeline 300, and a twelfth valve 330 is installed before the junction of the cross line 310 and the tank area liquefied gas pipeline 300. In addition, the acidic water outlet pipeline 200 is led to the foam station return water to condensate tank pipeline 700 via the outlet branch pipeline 210. The outlet branch pipeline 210 is equipped with a fourth valve 211. Specifically, the outlet branch pipeline 210 is equipped with a hand valve DN50 PN5.0; the acidic water outlet pipeline 200 is a DN50, PN5.0 pipeline.

[0032] Transfer pipeline 421 is led out from the manual valve of liquefied gas pipeline 300 in the tank area. Transfer pipeline 421 adopts DN50, PN5.0 pipeline and is connected to the open drain of the water jacket of external acid water storage tank 400. A drain DN20, PN5.0 is added to the pipeline.

[0033] Modification of the flare pipeline on the external acid water storage tank 400: To achieve safe gas phase discharge from the external acid water storage tank 400, a first discharge pipeline 431 is led out from the pressure gauge on the top of the external acid water storage tank 400. The first discharge pipeline 431 is a DN20, PN2.0 pipeline, which is connected to the outlet drain 810 of the flare separator tank 800. A one-way valve 4311 (DN20 PN2.0), a drain 4312 (DN20 PN2.0), and a second pressure gauge 4313 (D2F10 side) are added to the first discharge pipeline 431.

[0034] Modification of the nitrogen pipeline to the external acidic water storage tank 400: To achieve nitrogen replacement and pressure control of the external acidic water storage tank 400, a nitrogen inlet pipeline 510 is led out from the short section between the double valves of the 2.0MPa nitrogen pipeline 500 of the stabilizer tower. The nitrogen inlet pipeline 510 is a DN50, PN5.0 pipeline, which is connected to the first tank top exhaust port 430 of the external acidic water storage tank 400, i.e., a DN50 manual valve. A DN50, PN5.0 valve interface is reserved on the pipeline and a blind cover is added.

[0035] Acid water pump return line modification: to achieve reverse delivery and system isolation of acidic water. A hole is drilled in the 700 pipeline from the foam station return water to the condensate tank, connecting it to a short section between the double valves of the return line of the external pump 123. An eleventh valve 1253 and a third drain valve 1254 are added to the external discharge branch pipeline 1252. The eleventh valve 1253 is a manual valve (DN50, PN5.0), and the third drain valve 1254 is a pre-valve drain valve (DN20, PN5.0). Simultaneously, a manual valve 710 (DN80, PN2.0) is added to the end of the 700 pipeline from the foam station return water to the condensate tank.

[0036] On the other hand, one embodiment of the present invention provides a method for temporary storage and transfer of acidic water with pre-hydrogenated intermittent water injection. Before the external receiving device 30 stops operating, the liquid level of the acidic water storage tank 100 is reduced to 10%. After receiving the stop delivery instruction, the liquid level of the acidic water storage tank 100 is emptied, the external delivery pump 123 is stopped, and the control valve 126 and the inlet and outlet valves of the external delivery pump 123 are closed. Intermittent water injection is started to transfer the acidic water. When the liquid level of the acidic water storage tank 100 reaches 90%, the external delivery pump 123 is started to transfer the acidic water to the external acidic water storage tank 400 through the acidic water outlet pipeline 200, the cross-line 310, the tank area liquefied gas pipeline 300, and the transfer pipeline 421. The upstream and downstream in the above description refer to the upstream and downstream of the process from the acidic water storage tank 100 to the external acidic water storage tank 400. When the liquid level in the external acidic water storage tank 400 reaches 90%, reception stops. At the same time, the pressure of the external acidic water storage tank 400 is monitored. When the pressure reaches 0.1 MPa, it is immediately discharged to the flare gas pipeline 10. After the external receiving device 30 resumes reception, the process from the external acidic water storage tank 400 to the external receiving device 30 is opened. The external acidic water storage tank 400 is pressurized to 1.0 MPa. Nitrogen gas at 2.0 MPa is introduced through the nitrogen inlet pipeline 510 to pressurize the tank and send the acidic water to the external receiving device 30.

[0037] Specifically, the intermittent water injection and acidic water transfer operations are as follows: Preparations before shutdown: Before the external receiving device 30 is shut down, the liquid level of the acidic water storage tank 100 is reduced to 10%; after receiving the instruction to stop external delivery, the liquid level of the acidic water storage tank 100 is emptied, the external delivery pump 123 is stopped, and the control valve 126 and the inlet and outlet valves of the external delivery pump 123 are closed.

[0038] Intermittent water injection: Switch to water injection once every 3 days, 10t each time (water injection rate 3t / h, duration about 3h); if the flame arresters of F801 / F802 furnaces are cleaned frequently, the water injection volume can be increased or the water injection time can be extended.

[0039] Acidic water transfer: When the liquid level in acidic water storage tank 100 reaches 90%, start external pump 123 to transfer acidic water to external acidic water storage tank 400; when the liquid level in external acidic water storage tank 400 reaches 90%, stop receiving, and at the same time monitor the pressure of external acidic water storage tank 400. When the pressure reaches 0.1MPa, immediately discharge to flare gas pipeline 10.

[0040] After resuming work, the external receiving device resumes receiving, and the process from the external acidic water storage tank 400 to the external receiving device 30 is started. The external acidic water storage tank 400 is pressurized to 1.0 MPa and the acidic water is sent to the external receiving device 30.

[0041] Safety and congestion control measures Blockage monitoring: The internal operator monitors the temperature of A-101 (cooled temperature 38-50℃) and A-102 (cooled temperature 36-46℃) in real time, as well as the pressure difference of the E-101A / B tube side; the dispatcher reminds the adsorption unit to monitor the pressure difference of the F-801 / F-802 flame arresters, and switches them in time when the pressure difference increases.

[0042] Hydrogen sulfide control: Isolate the external acidic water storage tank 400 from non-essential systems via a blind flange 450 (only retain the flare gas pipeline 10, material receiving / discharging, and the 2.0MPa nitrogen pipeline 500); when operating the acidic water system, personnel must wear hydrogen sulfide protective masks and set up warning lines; the discharge of acidic water is prohibited, and the Safety and Environmental Protection Department will supervise the entire process.

[0043] Leakage prevention: Before the modification, hydrostatic tests were conducted on the external acid water storage tank 400, the reformed liquefied gas to aromatization pipeline 600, and the foam station return water to condensate tank pipeline 700; before commissioning, the newly modified pipelines were hydrostatically tested again.

[0044] Sufficient storage capacity: Through the coordinated storage of external acid water storage tank 400 (246.4m³) and acid water storage tank 100 (26.6m³), it can maintain a liquid level of 90% for about 80 days, which fully meets the 50-day downtime requirements of the external receiving device.

[0045] Low risk of blockage: Real-time monitoring of temperature and differential pressure, along with flame arrester switching measures, effectively prevents ammonium salt crystallization blockage and ensures stable equipment operation.

[0046] High safety: Multiple blind flanges, hydrogen sulfide protection, pressure monitoring and leak testing completely eliminate the risk of hydrogen sulfide leakage and pipeline leaks; the safety and environmental protection department supervises the entire process, prohibiting external discharge and meeting environmental protection requirements.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" a second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of a second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A temporary storage and transfer system for acidic water with pre-hydrogenated intermittent water injection, characterized in that: include An acidic water storage tank is connected to a pre-hydrogenation production acidic water feed pipeline. An acidic water delivery pipeline is connected to the bottom of the acidic water storage tank and is equipped with a double valve. An acidic water outlet pipeline is led out from the acidic water external pipeline between the two valves. The acidic water outlet pipeline is connected to the reformed liquefied gas to aromatization pipeline. The acidic water outlet pipeline is connected to an outlet branch pipeline, which is connected to the foam station return water to condensate tank pipeline. The liquefied gas pipeline in the tank area is connected to the reformed liquefied gas to aromatization pipeline via a crossover line; An external acidic water storage tank is connected to a densely packed pipeline at the bottom, which is connected to an open-drainage pipeline. The open-drainage pipeline is connected to the liquefied gas pipeline in the tank area via a transfer pipeline. The first exhaust port on the top of the external acidic water storage tank is connected to the flare gas pipeline network via a first discharge pipeline. A 2.0MPa nitrogen pipeline is connected to the first nitrogen port on the top of the external acidic water storage tank via a nitrogen inlet pipeline.

2. The temporary storage and transfer system for acidic water with pre-hydrogenated intermittent water injection according to claim 1, characterized in that: The second exhaust port on the top of the acidic water storage tank is connected to the flare gas pipeline network via a second discharge pipeline.

3. The temporary storage and transfer system for acidic water with pre-hydrogenated intermittent water injection according to claim 1, characterized in that: The 2.0MPa nitrogen pipeline is equipped with a first valve and a second valve along the nitrogen flow direction, and the 0.46MPa nitrogen pipeline and the 2.0MPa nitrogen pipeline meet downstream of the second valve.

4. The temporary storage and transfer system for acidic water with pre-hydrogenated intermittent water injection according to claim 1, characterized in that: The acidic water outlet pipeline is equipped with a third valve, a first drain valve, and a first pressure gauge.

5. The temporary storage and transfer system for acidic water with pre-hydrogenated intermittent water injection according to claim 1, characterized in that: A fourth valve is installed on the branch pipeline.

6. The temporary storage and transfer system for acidic water with pre-hydrogenated intermittent water injection according to claim 1, characterized in that: A fifth valve is installed on the liquefied gas pipeline in the tank area. The cross line connects to the liquefied gas pipeline in the tank area downstream of the fifth valve. The cross line is equipped with a sixth valve, a second drain valve, and a seventh valve.

7. The temporary storage and transfer system for acidic water with pre-hydrogenated intermittent water injection according to claim 1, characterized in that: The acidic water delivery pipeline is equipped with a delivery pump. An oil sludge tank pipeline is installed downstream of the outlet of the delivery pump on the acidic water delivery pipeline. The oil sludge tank pipeline is equipped with an eighth valve and a ninth valve. The acidic water delivery pipeline connects with the oil sludge tank pipeline through an external discharge cross-line between the eighth valve and the ninth valve.

8. The temporary storage and transfer system for acidic water with pre-hydrogenated intermittent water injection according to claim 7, characterized in that: The external discharge cross-line is equipped with a tenth valve.

9. The temporary storage and transfer system for acidic water with pre-hydrogenated intermittent water injection according to claim 8, characterized in that: Downstream of the tenth valve on the external discharge cross line, it is connected to the foam station return water to condensate tank pipeline via an external discharge cross line branch pipeline. A manual valve is installed on the foam station return water to condensate tank pipeline. The external discharge cross line branch pipeline and the foam station return water to condensate tank pipeline meet upstream of the manual valve. An eleventh valve and a third drain valve are installed on the external discharge cross line branch pipeline.

10. A method for temporary storage and transfer of acidic water via intermittent pre-hydrogenation injection, characterized in that: Before the external receiving unit shuts down, the acidic water storage tank level is lowered to 10%. Upon receiving the stop-transmission instruction, the acidic water storage tank is emptied, the external transmission pump is stopped, and the control valve and the inlet / outlet valve of the external transmission pump are closed. Intermittent water injection begins to transfer the acidic water. When the acidic water storage tank level reaches 90%, the external transmission pump is started to transfer the acidic water to the external acidic water storage tank through the acidic water outlet pipeline, cross-line, tank area liquefied gas pipeline, and transfer pipeline. When the external acidic water storage tank level reaches 90%, reception is stopped, and the pressure of the external acidic water storage tank is monitored. When the pressure reaches 0.1 MPa, it is immediately discharged to the flare gas network. After the external receiving unit resumes reception, the process from the external acidic water storage tank to the external receiving unit is opened, the external acidic water storage tank is pressurized to 1.0 MPa, and the acidic water is sent to the external receiving unit.

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