Petrochemical device steam turbine start-up condensate recovery system

Abstract

The utility model discloses a steam turbine start-up condensate recovery system of a petrochemical engineering device, and belongs to the technical field of petrochemical engineering. Comprising a compressor steam turbine used for being connected with a compressor; the ascites device is connected with the compressor steam turbine and used for outputting turbine condensate, the ascites device is provided with a main outlet pipeline, the main outlet pipeline is divided into a turbine condensate discharge pipeline and a polluted condensate discharge pipeline, the turbine condensate discharge pipeline is communicated to the outside, and the polluted condensate discharge pipeline is communicated to the rain drainage system; the ascites device is provided with an internal circulation system, a main outlet pipeline is provided with a backflow pipeline, and the main outlet pipeline is connected with the internal circulation system through the backflow pipeline. By arranging the internal circulation system of the ascites device, the condensate is recycled during the period of waiting for the test result of the condensate, so that the resource waste is reduced, and more importantly, the start-up program is allowed to be normally started during the test of the condensate, thereby ensuring that the device can continuously and stably run for a long period.

Description

Technical Field

[0001] This utility model belongs to the field of petrochemical technology, specifically relating to a system for recovering condensate during the start-up of a steam turbine in a petrochemical plant. Background Technology

[0002] The propane dehydrogenation unit has high-power heat pump compressors and reaction product compressors, and a large amount of high-pressure steam consumption. In the initial stage of start-up, the product condensate volume reaches 200-300 t / h.

[0003] However, due to the lag in condensate analysis results, condensate cannot be sent out, for example, to the polluted rainwater tank, before accurate condensate analysis results are obtained. Because the maximum outgoing sewage pump has a capacity of 60t / h, it cannot be processed in time. At the same time, the high temperature of the sewage impacts the downstream sewage treatment system, so the condensate cannot be discharged to the sewage tank.

[0004] According to existing operating procedures, if there is no suitable discharge point for the condensate generated when the turbine starts up, the unit compressor cannot start. Therefore, the lag in condensate analysis results will cause the unit compressor to be unable to start for a certain period of time, which will seriously affect work efficiency and increase cost expenditure. Utility Model Content

[0005] This invention addresses the aforementioned problems in the existing technology by proposing a system for condensate recovery during the start-up of a steam turbine in a petrochemical plant, which enables the compressor to be started during condensate analysis.

[0006] This utility model can be achieved through the following technical solutions:

[0007] A system for recovering condensate during the start-up of a steam turbine in a petrochemical plant includes:

[0008] A compressor steam turbine, used for connection to a compressor;

[0009] An ascites device is connected to the compressor steam turbine and used to output turbine condensate. The ascites device has a main outlet pipeline, which is divided into a turbine condensate discharge pipeline and a contaminated condensate discharge pipeline. The turbine condensate discharge pipeline is connected to the outside of the boundary, and the contaminated condensate discharge pipeline is connected to the rainwater drainage system.

[0010] The ascites device has an internal circulation system, and a return pipeline is provided on the main outlet pipeline, which is connected to the internal circulation system.

[0011] During the analysis of turbine coagulation fluid, the turbine coagulation fluid output by the ascites device is transported to the internal circulation system through the return pipeline for recycling.

[0012] After the turbine condensate analysis is completed, qualified turbine condensate is transported to the outside through the turbine condensate discharge pipeline, while unqualified contaminated condensate is transported to the rainwater drainage system through the contaminated condensate discharge pipeline.

[0013] As a further improvement of this utility model, a turbine condensate pump is provided on the main outlet pipeline, and the turbine condensate pump is connected to the water distribution tank of the ascites device.

[0014] As a further improvement of this utility model, the main outlet pipeline is provided with a first pre-shut-off valve, an outlet regulating valve, a first drain valve, and a first post-shut-off valve, wherein,

[0015] The outlet regulating valve is located between the first front shut-off valve and the first rear shut-off valve;

[0016] The first drain valve is located between the outlet regulating valve and the first post-shut-off valve;

[0017] The return line is connected to the main outlet line between the first drain valve and the first shut-off valve.

[0018] As a further improvement of this utility model, the return pipeline is provided with a second drain valve, a second front shut-off valve, and a second rear shut-off valve, with the second drain valve located between the second front shut-off valve and the second rear shut-off valve.

[0019] As a further improvement of this utility model, it also includes a condensate flash condenser, which is installed on the turbine condensate discharge pipeline.

[0020] As a further improvement of this utility model, a third post-shut-off valve is provided between the turbine condensate discharge pipeline and the inlet of the condensate flash condenser, and an additional contaminated condensate bypass pipeline is provided between the first post-shut-off valve and the third post-shut-off valve, and a bypass shut-off valve is provided on the contaminated condensate bypass pipeline.

[0021] As a further improvement of this utility model, it also includes an atmospheric pressure condensate flash tank, which is connected to the condensate flash condenser.

[0022] As a further improvement of this utility model, it also includes a low-pressure condensate inlet pipeline, through which low-pressure condensate from the main pipe is transported to the atmospheric pressure condensate flash tank for gas-liquid separation.

[0023] As a further improvement of this utility model, it also includes a steam condensate drain line and an atmospheric vent line. The steam condensate drain line is connected to the bottom of the atmospheric pressure condensate flash tank, and the atmospheric vent line is connected to the top of the condensate flash condenser.

[0024] The gas phase after gas-liquid separation in the atmospheric pressure condensate flash tank is discharged to the atmosphere through the condensate flash condenser after heat exchange;

[0025] The liquid phase after gas-liquid separation in the flash evaporator is discharged to the outside through the steam condensate discharge pipeline.

[0026] As a further improvement of this utility model, it also includes a circulating water cooling pipeline, which is used to transport circulating water to the polluted condensate discharge pipeline to reduce the temperature of the polluted condensate.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Improve production efficiency: By setting up an internal circulation system for the ascites device, the condensate can be recycled while waiting for the condensate test results. This not only reduces resource waste, but more importantly, it allows the start-up procedure to be started normally during the condensate test, thereby ensuring that the device can operate continuously and stably for a long period of time.

[0029] 2. Prevention of environmental pollution: Condensate will only be discharged outside the boundary after its quality is confirmed to meet the standards, which effectively avoids the environmental pollution risk that may be caused by the early direct discharge of untested condensate. In addition, unqualified polluted condensate is directed to the rainwater drainage system or other treatment facilities, which further ensures environmental safety.

[0030] 3. Enhanced Adaptability: The design of the turbine condensate drainage pipeline and the contaminated condensate drainage pipeline allows the system to more flexibly respond to different types of condensate treatment needs, improving the overall system's adaptability and efficiency. Especially when condensate quality is uncertain, the return pipeline can reintroduce the condensate into the internal circulation system, ensuring stable system operation.

[0031] 4. Protect downstream wastewater treatment systems: By rationally arranging the flow direction of condensate, especially by selecting appropriate discharge paths for condensate with high temperature or high pollution levels, the pressure and impact on downstream wastewater treatment facilities are reduced, which helps maintain their stable operation.

[0032] 5. Economic benefits: The recycling of condensate can generate significant economic benefits, which provides strong support for the sustainable development of enterprises.

[0033] 6. Equipment flexibility and reliability: When a single ascites device malfunctions, it can be removed individually without affecting the normal operation of other equipment. This means that even if a part has a problem, the remaining equipment can still continue to operate efficiently and deliver coagulation normally, which greatly improves the reliability and maintenance convenience of the entire system. Attached Figure Description

[0034] Figure 1This is a schematic diagram of the steam condensate circulation system of this utility model;

[0035] Figure 2 This is a schematic diagram illustrating the discharge principle of turbine condensate and polluted condensate according to this utility model.

[0036] In the diagram, 100 is the compressor / steam turbine; 110 is the compressor; 120 is the condensate drainer; 130 is the main outlet pipeline; 131 is the turbine condensate pump; 132 is the first pre-shut-off valve; 133 is the outlet regulating valve; 134 is the first drain valve; 135 is the first post-shut-off valve; 140 is the return pipeline; 141 is the second drain valve; 142 is the second pre-shut-off valve; 143 is the second post-shut-off valve; 150 is the turbine condensate discharge pipeline; 151 is the third post-shut-off valve; 160 is the contaminated condensate discharge pipeline; 170 is the contaminated condensate bypass pipeline; 171 is the bypass shut-off valve; 180 is the condensate flash condenser; 190 is the atmospheric pressure condensate flash tank; 200 is the low-pressure condensate input pipeline; 210 is the steam condensate discharge pipeline; 220 is the atmospheric vent pipeline; and 230 is the circulating water cooling pipeline. Detailed Implementation

[0037] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0038] like Figure 1-2 As shown, this utility model provides a system for recovering condensate during the start-up of a steam turbine in a petrochemical plant, comprising:

[0039] Compressor steam turbine 100: used to drive compressor 110;

[0040] Ascites device 120: Directly connected to the compressor steam turbine 100, it is specifically designed to process and output the condensate produced by the turbine. The device has a main outlet line 130, which is further divided into two branches: one is the turbine condensate discharge line 150, and the other is the contaminated condensate discharge line 160. The turbine condensate discharge line 150 discharges qualified condensate to the outside for collection, while the contaminated condensate discharge line 160 guides the contaminated condensate that fails the quality test to the rain drainage system.

[0041] Internal circulation system: Located inside the ascites device 120, it is used to recycle and reuse turbine condensate that has undergone preliminary treatment but has not yet been analyzed. The main outlet pipeline 130 is equipped with a return pipeline 140, which can guide the condensate with undetermined quality back into the internal circulation system, avoiding the risks that may be caused by direct discharge.

[0042] Specifically, in actual operation, while the turbine condensate is being analyzed, all produced condensate is sent to the internal circulation system for temporary storage and recycling. Once the test results are available and the condensate is confirmed to be a qualified product, it will be safely discharged outside the boundary through the turbine condensate discharge pipeline 150; if the test results show that the condensate is unqualified, it will be transferred to the contaminated condensate discharge pipeline 160 and eventually enter the rainwater drainage system or other suitable treatment processes.

[0043] This system has at least the following advantages:

[0044] 1. Improve production efficiency: By setting up an internal circulation system, the condensate is recycled while waiting for the condensate test results. This not only reduces resource waste, but more importantly, it allows the start-up procedure to be started normally during the condensate testing period, thereby ensuring that the unit can operate continuously and stably for long periods.

[0045] 2. Prevention of environmental pollution: Condensate is only discharged outside the boundary after its quality is confirmed to meet standards, effectively avoiding the environmental pollution risks that may result from the early direct discharge of untested condensate. Furthermore, substandard contaminated condensate is diverted to storm drain systems or other treatment facilities, further ensuring environmental safety.

[0046] 3. Enhanced Adaptability: The design of the turbine condensate discharge line 150 and the contaminated condensate discharge line 160 allows the system to more flexibly respond to different types of condensate treatment needs, improving the overall system's adaptability and efficiency. Especially when condensate quality is uncertain, the condensate can be reintroduced into the internal circulation system via the return line 140, ensuring stable system operation.

[0047] 4. Protect downstream wastewater treatment systems: By rationally arranging the flow direction of condensate, especially by selecting appropriate discharge paths for condensate with high temperature or high pollution levels, the pressure and impact on downstream wastewater treatment facilities are reduced, which helps maintain their stable operation.

[0048] 5. Economic benefits: The recycling of condensate can generate significant economic benefits, which provides strong support for the sustainable development of enterprises.

[0049] 6. Equipment Flexibility and Reliability: When a single ascites unit 120 malfunctions, it can be removed independently without affecting the normal operation of other equipment. This means that even if one part fails, the remaining equipment can continue to operate efficiently and deliver coagulation fluid normally, greatly improving the reliability and maintenance convenience of the entire system.

[0050] Furthermore, it should be noted that this embodiment includes both a heat pump compressor and a product compressor. Both are connected to a separate compressor steam turbine 100, a septic tank 120, and an internal circulation system within the septic tank 120. By configuring an independent system for each type of compressor 110, operators can flexibly adjust the operating parameters of each system according to actual production needs, thereby achieving optimal resource allocation and utilization.

[0051] Preferably, a turbine condensate pump 131 is installed on the main outlet pipeline 130. The turbine condensate pump 131 is connected to the water distribution tank of the ascites device 120. The turbine condensate pump 131 is not only responsible for extracting the pre-treated condensate from the water distribution tank, but also provides the necessary pressure to ensure that the condensate can be smoothly transported to different treatment paths, such as returning to the internal circulation system, discharging to the outside, or guiding the contaminated condensate discharge pipeline 160.

[0052] Preferably, the main outlet pipeline 130 is equipped with a first pre-shut-off valve 132, an outlet regulating valve 133, a first drain valve 134, and a first post-shut-off valve 135, wherein,

[0053] The outlet regulating valve 133 is located between the first front shut-off valve 132 and the first rear shut-off valve 135;

[0054] The first drain valve 134 is located between the outlet regulating valve 133 and the first post-shut-off valve 135;

[0055] The return line 140 is connected to the main outlet line 130 between the first drain valve 134 and the first post-shut-off valve 135.

[0056] Preferably, the return line 140 is provided with a second drain valve 141, a second front shut-off valve 142, and a second rear shut-off valve 143, with the second drain valve 141 located between the second front shut-off valve 142 and the second rear shut-off valve 143.

[0057] The specific operating procedure is as follows:

[0058] 1. Initial stage of operation (internal circulation phase):

[0059] Open the first front shut-off valve 132 on the main outlet pipeline 130 and close the first rear shut-off valve 135;

[0060] At the same time, open the second front shut-off valve 142 and the second rear shut-off valve 143 on the return line 140;

[0061] At this point, the turbine coagulation fluid is guided back into the internal circulation system of the ascites device 120 through the return line 140 for recycling until the test results are available.

[0062] 2. Prepare the external coagulant:

[0063] Once the various parameters of the turbine condensate have been analyzed, it will be ready to be shipped out.

[0064] First, open the first post-shut-off valve 135 on the main outlet pipeline 130;

[0065] Then gradually close the second front shut-off valve 142 and the second rear shut-off valve 143 on the return line 140;

[0066] Turbine condensate will be transported outward along the main outlet pipeline 130. Based on the test analysis results, qualified condensate will be discharged to the outside for collection through the turbine condensate discharge pipeline 150; or contaminated condensate that fails the quality test will be directed to the rainwater drainage system or other treatment facilities through the contaminated condensate discharge pipeline 160.

[0067] 3. Adjustment and maintenance:

[0068] The outlet regulating valve 133 on the main outlet pipeline 130 adjusts the amount of condensate delivered in real time according to the liquid level change of the ascites device 120, so as to ensure that the liquid level of the steam condensate inside the ascites device 120 is kept at a stable level.

[0069] The first drain valve 134 and the second drain valve 141 are used when it is necessary to drain the condensate in the pipeline, and are kept closed when not in use.

[0070] This design not only enables precise control of the condensate flow path, but also ensures the safety and stability of the system. In particular, during the waiting period for the test results, the internal circulation through the return pipeline 140 can ensure the normal start-up of the start-up procedure, thereby ensuring the long-term operation of the unit.

[0071] Preferably, it also includes a condensate flash condenser 180, which is installed on the turbine condensate discharge pipeline 150. The turbine condensate from each compressor is pumped out by a sump pump, collected and sent to the condensate flash condenser 180 for heat exchange, and then sent to the condensate refining station outside the boundary for treatment through the turbine condensate discharge pipeline 150.

[0072] Preferably, a third post-shut-off valve 151 is provided between the turbine condensate drain line 150 and the inlet of the condensate flash condenser 180. It should be noted that since the total outlet line of the heat pump compressor and the main outlet line 130 of the product compressor are connected in parallel, they are controlled by the first post-shut-off valve 135 to open or close their respective lines. Subsequently, they are connected to the condensate flash condenser 180 through the same turbine condensate drain line 150. Therefore, the third post-shut-off valve 151 is used to open or close whether the turbine condensate drain line 150 enters the condensate flash condenser 180. Once the third post-shut-off valve 151 is closed, the contaminated condensate is discharged to the rain drain system through the contaminated condensate drain line 160.

[0073] In addition, an additional contaminated condensate bypass line 170 is provided between the first post-shut-off valve 135 and the third post-shut-off valve 151, and a bypass shut-off valve 171 is provided on the contaminated condensate bypass line 170. That is, the contaminated condensate of the heat pump compressor and the product compressor can be discharged to the rain drain system along their respective contaminated condensate discharge lines 160, or simultaneously discharged to the rain drain system through the contaminated condensate bypass line 170.

[0074] The specific operating procedure is as follows:

[0075] 1. Normal operating mode (qualified condensate treatment):

[0076] Open the corresponding first shut-off valve 135 (for heat pump compressors or product compressors) to ensure that qualified turbine condensate can enter the turbine condensate discharge line 150;

[0077] Open the third shut-off valve 151 to allow qualified turbine condensate to enter the condensate flash condenser 180 for heat exchange.

[0078] After heat exchange in the condensate flash condenser 180, the turbine condensate is safely discharged to the condensate refining station outside the boundary for treatment.

[0079] 2. Abnormal Handling Mode (Contaminated Coagulated Liquid Treatment):

[0080] If the turbine condensate is detected to be substandard contaminated condensate, keep or close the third shut-off valve 151 to prevent it from entering the condensate flash condenser 180.

[0081] The substandard contaminated condensate generated by the heat pump compressor and the product compressor will be directly discharged into the rainwater drainage system through their respective contaminated condensate discharge pipelines 160;

[0082] Alternatively, if necessary, the contaminated condensate from the two compressors 110 can be discharged into the rainwater drainage system through the contaminated condensate bypass line 170 by opening the bypass shut-off valve 171.

[0083] This design enhances the system's flexibility and adaptability, ensuring effective management of various types of condensate even under different operating conditions.

[0084] Preferably, the system further includes an atmospheric pressure condensate flash tank 190, which is connected to the condensate flash condenser 180. In addition, the system includes a low-pressure condensate inlet line 200 for transporting low-pressure condensate from the main pipe to the atmospheric pressure condensate flash tank 190 for gas-liquid separation treatment, specifically configured as follows:

[0085] Atmospheric pressure condensate flash tank 190: used to receive low-pressure condensate entering through low-pressure condensate inlet line 200 and to perform gas-liquid separation therein;

[0086] Low-pressure condensate inlet line 200: This line guides the low-pressure condensate in the main pipe to the atmospheric pressure condensate flash tank 190;

[0087] Steam condensate drain line 210: connected to the bottom of atmospheric pressure condensate flash tank 190, used to discharge the liquid phase after gas-liquid separation;

[0088] Atmospheric exhaust pipeline 220: connected to the top of the condensate flash condenser 180. After the gas phase of the atmospheric pressure condensate flash tank 190 is separated from the liquid, it is safely discharged into the atmosphere through the atmospheric exhaust pipeline 220 after heat exchange through the condensate flash condenser 180.

[0089] Specifically, after the turbine condensate enters the condensate flash condenser 180, it exchanges heat with the flash steam of the low-pressure condensate. After the heat exchange, the turbine condensate is directly sent to the condensate refining station outside the boundary for treatment through the turbine condensate discharge pipeline 150. Part of the flash steam is condensed, and the remainder is discharged into the atmosphere through the atmospheric discharge pipeline 220. The condensed liquid phase enters the atmospheric pressure condensate flash tank 190 and finally flows out from the bottom of the atmospheric pressure condensate flash tank 190 and is sent to the deaerator in the boundary of the ethylene plant through the steam condensate discharge pipeline 210 for recycling.

[0090] Preferably, it also includes a circulating water cooling pipeline 230, which is used to transport circulating water to the contaminated condensate discharge pipeline 160 to reduce the temperature of the contaminated condensate. This design allows for immediate cooling of high-temperature contaminated condensate, thereby avoiding the environmental risks and impact on downstream treatment facilities that may result from direct discharge of high-temperature condensate.

[0091] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

[0092] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0093] Furthermore, in this utility model, descriptions involving "", "a", "one", etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "" or "a" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0094] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean 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 utility model according to the specific circumstances.

[0095] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A system for recovering condensate from a steam turbine start-up of a petrochemical plant, characterized in that, Comprise: A compressor steam turbine connected with the compressor; An ascites device connected with the compressor steam turbine and used for outputting turbine condensate, the ascites device having a main outlet pipeline, the main outlet pipeline being branched into a turbine condensate discharge pipeline and a contaminated condensate discharge pipeline, the turbine condensate discharge pipeline being communicated to the outside, and the contaminated condensate discharge pipeline being communicated to a rainwater drainage system; The ascites device has an internal circulation system, and a return pipeline is arranged on the main outlet pipeline and connected with the internal circulation system; During the turbine condensate test and analysis, the turbine condensate output by the ascites device is transported to the internal circulation system through the return pipeline for recycling; After the turbine condensate test and analysis, the qualified turbine condensate is transported to the outside through the turbine condensate discharge pipeline, and the unqualified contaminated condensate is transported to the rainwater drainage system through the contaminated condensate discharge pipeline.

2. The system for recovering condensate from a start-up of a steam turbine of a petroleum chemical plant according to claim 1, characterized by, A turbine condensate pump is arranged on the main outlet pipeline and connected with the water distribution package of the ascites device.

3. The system for recovering condensate from a start-up of a steam turbine of a petroleum chemical plant according to claim 1, characterized by, The main outlet pipeline is provided with a first front shut-off valve, an outlet regulating valve, a first guide valve and a first rear shut-off valve, wherein The outlet regulating valve is located between the first front shut-off valve and the first rear shut-off valve; The first guide valve is located between the outlet regulating valve and the first rear shut-off valve; The return pipeline is connected to the main outlet pipeline between the first guide valve and the first rear shut-off valve.

4. The system for recovering condensate from a start-up of a steam turbine of a petroleum chemical plant according to claim 1, characterized by, A second guide valve, a second front shut-off valve and a second rear shut-off valve are arranged on the return pipeline, and the second guide valve is located between the second front shut-off valve and the second rear shut-off valve.

5. The system for recovering condensate from a start-up of a steam turbine of a petroleum chemical plant according to claim 3, characterized by, A condensate flash condenser is further arranged on the turbine condensate discharge pipeline.

6. The system for recovering condensate from a start-up steam turbine of a petroleum chemical plant according to claim 5, characterized in that, A third rear shut-off valve is arranged between the turbine condensate discharge pipeline and the condensate flash condenser inlet, an additional contaminated condensate bypass pipeline is arranged between the first rear shut-off valve and the third rear shut-off valve, and a bypass shut-off valve is arranged on the contaminated condensate bypass pipeline.

7. The system for recovering condensate from a start-up steam turbine of a petroleum chemical plant according to claim 5, characterized in that, A normal-pressure condensate flash tank is further arranged and connected with the condensate flash condenser.

8. The system for recovering condensate from a start-up steam turbine of a petroleum chemical plant according to claim 7, characterized by, A low-pressure condensate input pipeline is further arranged, and low-pressure condensate from a header is transported into the normal-pressure condensate flash tank through the low-pressure condensate input pipeline for gas-liquid separation.

9. The system for recovering condensate from a start-up steam turbine of a petroleum chemical plant according to claim 7, characterized in that, A steam condensate discharge pipeline and an air discharge pipeline are further arranged, the steam condensate discharge pipeline is connected with the tank bottom of the normal-pressure condensate flash tank, and the air discharge pipeline is connected with the top of the condensate flash condenser, wherein The gas phase after the gas-liquid separation in the normal-pressure condensate flash tank is discharged to the atmosphere through the air discharge pipeline after heat exchange in the condensate flash condenser; The liquid phase after the gas-liquid separation in the normal-pressure condensate flash tank is discharged to the outside through the steam condensate discharge pipeline.

10. The system for recovering condensate from a start-up of a steam turbine of a petroleum chemical plant according to Claim 1, characterized by, A circulating water cooling pipeline is further arranged and used for transporting circulating water to the contaminated condensate discharge pipeline to reduce the temperature of the contaminated condensate.

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