Control device and method for non-normal shutdown of oil residue gasification under pressure and continuous start-up

Abstract

The application discloses a control device and method for oil residue gasification non-normal parking and pressure continuous starting, and the device comprises a gasification furnace, a cyclone separator and a water washing tower. The gasification furnace is connected with multiple process pipelines, and cut-off valves, regulating valves, sensors and other components are arranged on the pipelines to form a complete monitoring and control system. The method comprises the following steps: after the gasification furnace is non-normally parked, the oxygen, the feed oil and the synthesis gas are isolated, the system is depressurized, and the oil passage is purged; after fault treatment is completed, a pressure continuous starting program is directly triggered, the start-up pumping is closed, the stable furnace chamber pressure is established, the steam flow is established, and the feeding sequence is started. The whole process does not need to be cooled, replaced and re-heated. The application realizes the rapid pressure continuous starting of the gasification furnace after non-normal parking, greatly shortens the production recovery time, saves the material and energy cost, improves the control precision and the production continuity, is suitable for the existing oil residue hydrogen production gasification furnace system, and has low application cost.

Description

Technical Field

[0001] This invention relates to the field of production control technology for oil residue hydrogen production gasification furnaces, specifically to control equipment and methods for pressurized continuous restart after an abnormal shutdown of an oil residue gasification furnace. Background Technology

[0002] When feeding materials into an oil residue hydrogen gasification furnace, the furnace pressure needs to be stabilized at 1.3 MPa, while the oxygen and steam pipeline pressures are 8.0 MPa and 8.5 MPa, respectively. Due to the large pressure difference before and after the oxygen and steam shut-off valves, they are prone to failure to open within the specified time, directly causing feeding failure and triggering abnormal shutdown of the gasification furnace. In existing technologies, after the gasification furnace is shut down, a full-process operation including cooling, depressurization, and nitrogen purging is required. After the system returns to its initial state, the furnace must be reheated and recharged before feeding materials can be fed again. This not only results in excessively long intervals between feeding operations, causing a large waste of resources such as nitrogen, steam, and oil residue, but also interrupts the continuity of upstream and downstream production systems, increases production and maintenance costs, and restricts overall production efficiency. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a control device and method for pressurized continuous start-up after abnormal shutdown of oil residue gasification. This enables rapid start-up of the gasifier under pressure without the need for cooling, replacement, or re-drying after abnormal shutdown, solving the problems of long intervals between refeeding and resource waste, reducing production costs, and ensuring the continuity of the production system.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: This invention discloses a control device for pressurized continuous restart of an oil residue gasification system after an abnormal shutdown. The device includes a gasifier. The inlet of the gasifier is connected to a No. 1 steam pipeline, an oxygen pipeline, a No. 2 steam pipeline, a feed oil pipeline, and a No. 6 pipeline. The outlet of the gasifier is connected to a cyclone separator via a No. 1 pipeline. The cyclone separator is connected to a water washing tower via a No. 2 pipeline. A No. 7 pipeline for conveying medium-pressure nitrogen is connected to the No. 2 pipeline. The upper outlet of the water washing tower is connected to two pipelines: a No. 3 pipeline and a No. 4 pipeline. The No. 3 pipeline connects to the subsequent system flow, and the No. 4 pipeline connects to... Flare line; oxygen pipeline with oxygen shut-off valve No. 1 and oxygen shut-off valve No. 2 connected in series; feed oil pipeline with feed oil pump and feed oil shut-off valve No. 1 connected in series; steam pipeline with steam vent valve No. 1, steam shut-off valve No. 1 and steam shut-off valve No. 2 connected in series; steam pipeline with oil passage purging steam valve No. 1 and oil passage purging steam valve No. 2 connected in series; pipeline No. 6 with medium-pressure nitrogen valve No. 1 and medium-pressure nitrogen valve No. 2; pipeline No. 7 with medium-pressure nitrogen valve No. 3 and medium-pressure nitrogen valve No. 4.

[0005] Preferably, pipeline No. 5 is connected to pipeline No. 1, and pipeline No. 5 is connected in parallel with start-up extraction valve No. 1 and start-up extraction valve No. 2. The outlet end of pipeline No. 5 is connected to a silencer and an extraction device in sequence; pipeline No. 3 is connected to the syngas remote control valve at the outlet of water washing tower No. 1, and pipeline No. 4 is connected in parallel with the pressure regulating valve at the outlet of water washing tower No. 1 and the pressure regulating valve at the outlet of water washing tower No. 2.

[0006] Preferably, the gasifier is equipped with a temperature sensor and a second pressure sensor. The temperature sensor is used to detect the temperature of the gasifier furnace in real time, and the second pressure sensor is used to detect the pressure of the gasifier furnace in real time.

[0007] Preferably, a pressure sensor and a flow sensor are installed on the No. 1 steam pipeline. The pressure sensor is used to detect the pressure difference between the high-pressure steam and the gasifier, and the flow sensor is used to detect the flow rate of the process burner steam main.

[0008] Preferably, a second flow sensor is installed on the oxygen pipeline to detect the flow rate of the oxygen pipeline in a single furnace; a third flow sensor is installed on the feed oil pipeline to detect the outlet flow rate of the feed oil pump; and a pressure sensor for the outlet pipeline of the water washing tower is installed on the third pipeline.

[0009] This invention provides a control method for pressurized continuous start-up of oil residue gasification after abnormal shutdown based on the aforementioned control equipment. After an abnormal shutdown of the gasifier, the shutdown sequence is first executed to complete media isolation, system depressurization, and channel purging. After purging is completed, when the set conditions are met, the pressurized continuous start-up program is manually triggered to enter the feeding sequence. The entire process does not require cooling, replacement, or re-baking of the gasifier, thus completing the pressurized continuous start-up.

[0010] Preferably, the parking sequence specifically includes the following steps: Step 1) Oxygen isolation: Close the No. 1 oxygen shut-off valve and the No. 2 oxygen shut-off valve on the oxygen pipeline to cut off the oxygen supply to the gasifier; Step 2) Feed oil isolation: Stop the operation of the feed oil pump, close the No. 1 feed oil shut-off valve on the feed oil pipeline, and cut off the feed of oil residue to the gasifier; Step 3) Syngas Isolation: Close the syngas remote control valve at the outlet of the No. 1 water scrubbing tower on pipeline No. 3 to prevent syngas from flowing back into the gasifier; Step 4) System depressurization: Open the pressure regulating valves at the outlets of the No. 1 and No. 2 water washing towers on the No. 4 pipeline to reduce the pressure of the gasifier and its supporting pipeline system to a safe range. Step 5) Oil passage purging: Open the No. 1 oil passage purging steam valve and the No. 2 oil passage purging steam valve on the No. 2 steam pipeline to introduce steam to purge the feed oil pipeline. The basic purging time is 3 minutes, which can be adjusted according to the actual running time of the gasifier. Step 6) Confirmation of completion of purging: After the purging time reaches the target, confirm that the fault of abnormal shutdown has been dealt with and the conditions for continuous pressurization are met, and prepare to enter the feeding sequence.

[0011] Preferably, the feeding sequence specifically includes the following steps: Step 1) Close the start-up extraction valve: Close the No. 1 start-up extraction valve and the No. 2 start-up extraction valve on the No. 5 pipeline to terminate the start-up extraction operation and create a closed pressurized environment for the gasifier. Step 2) Establish and stabilize the gasifier pressure: Keep the No. 1 and No. 2 medium-pressure nitrogen valves on pipeline No. 6, and the No. 3 and No. 4 medium-pressure nitrogen valves on pipeline No. 7 in the open state. Use medium-pressure nitrogen to make the gasifier pressure rise naturally. Monitor the furnace pressure in real time through the No. 2 pressure sensor. With the coordinated control of the No. 1 and No. 2 water washing tower outlet pressure regulating valves, stabilize the gasifier furnace pressure at 1.3MPa. Step 3) Establish a stable steam flow: Open the No. 1 steam shut-off valve and the No. 2 steam shut-off valve on the No. 1 steam pipeline, close the No. 1 steam vent valve, and introduce steam into the gasifier; close the No. 1 medium-pressure nitrogen valve and the No. 2 medium-pressure nitrogen valve on the No. 6 pipeline, and the No. 3 medium-pressure nitrogen valve and the No. 4 medium-pressure nitrogen valve on the No. 7 pipeline, then open the No. 1 oil passage purging steam valve and the No. 2 oil passage purging steam valve and close them after purging for 60 seconds, and monitor and ensure the steam flow is stable through the No. 1 flow sensor; Step 4) Start feeding and resume production: Start the feed oil pump, open the No. 1 feed oil shut-off valve, and control the outlet flow of the feed oil pump through the No. 3 flow sensor; at the same time, open the No. 1 oxygen shut-off valve and the No. 2 oxygen shut-off valve, and control the flow of the single furnace oxygen pipeline through the No. 2 flow sensor, so that the oil residue and oxygen enter the gasifier according to the process ratio, and complete the pressurized continuous start-up.

[0012] Preferably, in step 2, when adjusting the gasifier pressure, the pressure of pipeline No. 3 is monitored in real time by the pressure sensor of the water washing tower outlet pipeline to help determine the system pressure stability, and in conjunction with pressure sensor No. 2, the gasifier furnace pressure is precisely controlled.

[0013] Preferably, the abnormal shutdown is applicable in the following scenarios: feeding failure caused by the timeout of the No. 1 oxygen shut-off valve, No. 2 oxygen shut-off valve, No. 1 steam shut-off valve, and No. 2 steam shut-off valve during feeding, or shutdown caused by abnormal reasons other than equipment damage during normal operation of the gasifier, and this method is executed when the abnormal reasons have been dealt with and all sensors and valves are working normally.

[0014] Beneficial Effects: The control equipment and method of this invention, through optimized pipeline layout, precise monitoring and control components, and targeted shutdown and feeding sequence design, achieve rapid restart under pressure after abnormal shutdown of oil residue gasification. Specifically, it eliminates the need for cooling, nitrogen purging, and re-baking of the gasifier throughout the process, reducing the interval between feeding after abnormal shutdown from several hours to less than 20 minutes, significantly improving production recovery efficiency; effectively saves nitrogen, steam, oil residue, and other materials, as well as the energy consumption required for furnace baking, reducing production and maintenance costs and improving economic efficiency; employs multiple sensors to monitor furnace pressure, temperature, and flow and pressure of each pipeline in real time, and coordinates with multiple valves for precise control of the pressurized continuous feeding process, ensuring the safety and stability of the start-up process; it is highly adaptable, simple to operate, and can be directly applied to existing oil residue hydrogen gasification furnace production systems, significantly reducing application costs; it reduces the impact of abnormal gasifier shutdowns on upstream and downstream production systems, ensuring the continuity of the overall production process and improving the overall production efficiency and capacity of the enterprise. Attached Figure Description

[0015] Figure 1 This is a flowchart of the parking sequence of the present invention.

[0016] Figure 2 This is a flowchart of the pressurized continuous feeding process of the present invention.

[0017] Figure 3 This is a schematic diagram of the device principle of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described 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.

[0019] Invention content / principle: The control device for pressurized continuous restart after abnormal shutdown of oil residue gasification provided by the present invention includes a gasifier 1. The inlet end of the gasifier 1 is connected to a No. 1 steam pipeline, an oxygen pipeline, a No. 2 steam pipeline, a feed oil pipeline, and a No. 6 pipeline. The outlet end of the gasifier 1 is connected to a cyclone separator 2 through a No. 1 pipeline. The cyclone separator 2 is connected to a water washing tower 3 through a No. 2 pipeline. A No. 7 pipeline for conveying medium-pressure nitrogen is connected to the No. 2 pipeline. The upper outlet of the water washing tower 3 is connected to a No. 3 pipeline and a No. 4 pipeline. The No. 3 pipeline is connected to the subsequent system process, and the No. 4 pipeline is connected to the flare pipeline.

[0020] On the oxygen pipeline, oxygen shut-off valve XZV-X0011 and oxygen shut-off valve XZV-X0012 are connected in series. On the feed oil pipeline, feed oil pump P-X001 and feed oil shut-off valve XZV-X0001 are connected in series. On the steam pipeline, steam vent valve XZV-X0008, steam shut-off valve XZV-X0006, and steam shut-off valve XZV-X0007 are connected in series. On the steam pipeline, oil passage purging steam valve XZV-X0002 and oil passage purging steam valve XZV-X0004 are connected in series. On pipeline 6, medium-pressure nitrogen valve XZV-X0025 and medium-pressure nitrogen valve XZV-X0042 are connected. On pipeline 7, medium-pressure nitrogen valve XZV-X0034 and medium-pressure nitrogen valve XZV-X0035 are connected.

[0021] Pipeline 1 is connected to Pipeline 5. Pipeline 5 is connected in parallel to start-up extraction valve XZV-X0014A and start-up extraction valve XZV-X0014B. The outlet end of Pipeline 5 is connected to a silencer and an extraction device in sequence. Pipeline 3 is connected to the syngas remote control valve HCV-X0043 at the outlet of water washing tower 1. Pipeline 4 is connected in parallel to the pressure regulating valve PCV-X0043A at the outlet of water washing tower 1 and the pressure regulating valve PCV-X0043B at the outlet of water washing tower 2.

[0022] Gasifier 1 is equipped with a temperature sensor TI-X0032-37 and a second pressure sensor PZI-X0004. The temperature sensor TI-X0032-37 is used to detect the furnace temperature of the gasifier in real time, and the second pressure sensor PZI-X0004 is used to detect the furnace pressure of the gasifier in real time. On the first steam pipeline, a first pressure sensor PZI-X0010 and a first flow sensor FZI-X0006 are installed. The first pressure sensor PZI-X0010 is used to detect the pressure difference between the high-pressure steam and the gasifier, and the first flow sensor FZI-X0006 is used to detect the flow rate of the steam main of the process burner.

[0023] The oxygen pipeline is equipped with a second flow sensor, FZI-X0006, which is used to detect the flow rate of the oxygen pipeline in a single furnace; the feed oil pipeline is equipped with a third flow sensor, FZI-X0002 / 03 / 04, which is used to detect the outlet flow rate of the feed oil pump P-X001; and the third pipeline is equipped with a pressure sensor, PZT-X0043, for the outlet pipeline of the water washing tower.

[0024] The present invention also provides a control method for pressurized continuous start-up after abnormal shutdown of oil residue gasification based on the above-mentioned control equipment. After abnormal shutdown of the gasifier, the shutdown sequence is first executed to complete medium isolation, system depressurization and channel purging. After purging is completed, the pressurized continuous start-up program is directly triggered to enter the feeding sequence. There is no need to cool down, replace and re-bake the gasifier throughout the process, thus completing the pressurized continuous start-up.

[0025] The parking procedure specifically includes the following steps: Step 1) Oxygen isolation: Close the No. 1 oxygen shut-off valve XZV-X0011 and the No. 2 oxygen shut-off valve XZV-X0012 on the oxygen pipeline to cut off the oxygen supply to gasifier 1. Step 2) Feed oil isolation: Stop the operation of feed oil pump P-X001, close the No. 1 feed oil shut-off valve XZV-X0001 on the feed oil pipeline, and cut off the feed of oil residue to gasifier 1; Step 3) Syngas Isolation: Close the syngas remote control valve HCV-X0043 at the outlet of the No. 1 water washing tower on the No. 3 pipeline to prevent syngas from flowing back into the gasifier 1; Step 4) System depressurization: Open the outlet pressure regulating valve PCV-X0043A of the No. 1 water washing tower and the outlet pressure regulating valve PCV-X0043B of the No. 2 water washing tower on the No. 4 pipeline to reduce the pressure of gasifier 1 and its supporting pipeline system to a safe range. Step 5) Oil passage purging: Open the No. 1 oil passage purging steam valve XZV-X0002 and the No. 2 oil passage purging steam valve XZV-X0004 on the No. 2 steam pipeline to introduce steam to purge the feed oil pipeline. The basic purging time is 3 minutes, which can be adjusted according to the actual running time of the gasifier. Step 6) Confirmation of completion of purging: After the purging time reaches the target, confirm that the fault of abnormal shutdown has been dealt with and the conditions for continuous pressurization are met, and prepare to enter the feeding sequence.

[0026] The feeding sequence specifically includes the following steps: Step 1) Close the start-up extraction valve: Close the No. 1 start-up extraction valve XZV-X0014A and the No. 2 start-up extraction valve XZV-X0014B on the No. 5 pipeline to terminate the start-up extraction operation and create a closed pressurized environment for gasifier 1. Step 2) Establish and stabilize the gasifier pressure: Keep the No. 1 medium-pressure nitrogen valve XZV-X0025 and No. 2 medium-pressure nitrogen valve XZV-X0042 on pipeline No. 6, and the No. 3 medium-pressure nitrogen valve XZV-X0034 and No. 4 medium-pressure nitrogen valve XZV-X0035 on pipeline No. 7 in the open state. Use medium-pressure nitrogen to make the pressure of gasifier 1 rise naturally. Monitor the furnace pressure in real time through pressure sensor PZI-X0004. With the coordinated control of pressure regulating valves PCV-X0043A and PCV-X0043B at the outlet of water washing tower No. 1, stabilize the furnace pressure of gasifier 1 at 1.3MPa. At the same time, monitor the pressure of pipeline No. 3 in real time through pressure sensor PZT-X0043 at the outlet of water washing tower to help judge the system pressure stability. Step 3) Establish a stable steam flow: Open steam shut-off valve XZV-X0006 and steam shut-off valve XZV-X0007 on steam pipeline 1, and close steam vent valve XZV-X0008 to introduce steam into gasifier 1; close medium-pressure nitrogen valve XZV-X0025 and medium-pressure nitrogen valve XZV-X0042 on pipeline 6, and medium-pressure nitrogen valve XZV-X0034 and medium-pressure nitrogen valve XZV-X0035 on pipeline 7; then open oil passage purging steam valve XZV-X0002 and oil passage purging steam valve XZV-X0004 to purge for 60 seconds and then close them; monitor and ensure stable steam flow through flow sensor FZI-X0006. Step 4) Start feeding and resume production: Start the feed oil pump P-X001, open the No. 1 feed oil shut-off valve XZV-X0001, and control the feed oil pump outlet flow rate through the No. 3 flow sensor FZI-X0002 / 03 / 04; at the same time, open the No. 1 oxygen shut-off valve XZV-X0011 and the No. 2 oxygen shut-off valve XZV-X0012, and control the single furnace oxygen pipeline flow rate through the No. 2 flow sensor FZI-X0006, so that the oil residue and oxygen enter the gasifier 1 according to the process ratio, and complete the pressurized continuous start-up.

[0027] This method is applicable in the following scenarios: feeding failure caused by the timeout of the No. 1 oxygen shut-off valve XZV-X0011, No. 2 oxygen shut-off valve XZV-X0012, No. 1 steam shut-off valve XZV-X0006, and No. 2 steam shut-off valve XZV-X0007 during feeding, or shutdown caused by abnormal reasons other than equipment damage during normal operation of the gasifier, provided that the abnormal reasons have been dealt with and all sensors and valves are working normally.

[0028] Example 1: The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0029] In this embodiment, the control equipment for restarting the oil residue gasification system under pressure after an abnormal shutdown includes a gasifier 1, a cyclone separator 2, a water washing tower 3, and various supporting pipelines, valves, and sensors. The inlet of the gasifier 1 is connected to steam pipeline No. 1, oxygen pipeline No. 2, feed oil pipeline, and pipeline No. 6. The outlet of the gasifier 1 is connected to cyclone separator 2 via pipeline No. 1. Cyclone separator 2 is connected to water washing tower 3 via pipeline No. 2. Pipeline No. 2 is connected to pipeline No. 7. The upper end of water washing tower 3 is connected to pipelines No. 3 and No. 4. Pipeline No. 1 is connected to pipeline No. 5. The outlet of pipeline No. 5 is connected to a silencer and an extractor in sequence. The valves and sensors on each pipeline are assembled according to the requirements of the invention. All equipment is electrically connected to the control module to realize real-time parameter monitoring and automatic valve control.

[0030] This embodiment addresses a scenario where the oil residue hydrogen gasification furnace fails to feed materials and shuts down abnormally due to the timeout of the No. 1 steam shut-off valve XZV-X0006. The pressurized continuous start-up control method of this invention is implemented, and the specific operation process is as follows: Execute parking sequence: Step 1) Oxygen isolation: The central control system issues an instruction to immediately close the No. 1 oxygen shut-off valve XZV-X0011 and the No. 2 oxygen shut-off valve XZV-X0012 on the oxygen pipeline, completely cutting off the oxygen supply to gasifier 1 to prevent abnormal reactions from occurring inside the furnace. Step 2) Feed oil isolation: Simultaneously stop the operation of feed oil pump P-X001, close the No. 1 feed oil shut-off valve XZV-X0001 on the feed oil pipeline, block the feed passage of oil residue to gasifier 1, and maintain the system shutdown state; Step 3) Syngas Isolation: Close the syngas remote control valve HCV-X0043 at the outlet of the No. 1 water washing tower on the No. 3 pipeline to prevent the syngas in the water washing tower 3 from flowing back to the gasifier 1 and to prevent abnormal pressure and medium composition in the furnace. Step 4) System depressurization: Open the outlet pressure regulating valve PCV-X0043A of the No. 1 water washing tower and the outlet pressure regulating valve PCV-X0043B of the No. 2 water washing tower on the No. 4 pipeline to reduce the pressure of gasifier 1 and all supporting pipelines from 1.3MPa to the safe range of 0.2MPa. The depressurization process is monitored in real time by the No. 2 pressure sensor PZI-X0004. Step 5) Oil passage purging: Open the No. 1 oil passage purging steam valve XZV-X0002 and the No. 2 oil passage purging steam valve XZV-X0004 on the No. 2 steam pipeline, and introduce high-temperature steam of 8.5MPa to purge the feed oil pipeline. The actual running time of gasifier 1 is 6 hours, and the purging time is kept at 3 minutes to thoroughly remove the residual oil residue in the pipeline. Step 6) Confirmation of purging completion: After 3 minutes of purging, the on-site maintenance personnel confirmed that the fault of No. 1 steam shut-off valve XZV-X0006 had been repaired, and that all valves and sensors were working normally, meeting the conditions for continuous pressurization. After reporting back to the central control system, they prepared to enter the feeding sequence.

[0031] Execute the feeding sequence: Step 1) Shut down the start-up extraction: The central control system shuts down the No. 1 start-up extraction valve XZV-X0014A and the No. 2 start-up extraction valve XZV-X0014B on the No. 5 pipeline to terminate the start-up extraction operation and create a closed pressurized environment for gasifier 1. Step 2) Establish and stabilize the gasifier pressure: Keep medium-pressure nitrogen valves XZV-X0025 and XZV-X0042 on pipeline 6, and medium-pressure nitrogen valves XZV-X0034 and XZV-X0035 on pipeline 7 open, continuously supplying medium-pressure nitrogen into the system, and the pressure of gasifier 1 will naturally rise; monitor the furnace pressure in real time through pressure sensor PZI-X0004, and at the same time monitor the pressure of pipeline 3 through pressure sensor PZT-X0043 at the outlet of the water washing tower to assist in judgment. With the coordinated adjustment of pressure regulating valves PCV-X0043A and PCV-X0043B at the outlet of the water washing tower, the furnace pressure of gasifier 1 will be accurately stabilized at 1.3MPa within 10 minutes; Step 3) Establishing a stable steam flow: Open steam shut-off valve XZV-X0006 and steam shut-off valve XZV-X0007 on steam pipeline 1, and close steam vent valve XZV-X0008. High-pressure steam of 8.5MPa is introduced into gasifier 1. Then close all medium-pressure nitrogen valves on pipelines 6 and 7, and open steam valve XZV-X0002 and steam valve XZV-X0004 for purging oil passage 1 for 60 seconds to remove residual nitrogen in the steam pipeline. After purging, close the valve and monitor the flow through flow sensor FZI-X0006 to ensure that the flow rate of the process burner steam main is stable at the preset process value. Step 4) Start feeding and resume production: Start the feed oil pump P-X001, open the No. 1 feed oil shut-off valve XZV-X0001, and control the outlet flow of the feed oil pump within the process requirements range through the No. 3 flow sensor FZI-X0002 / 03 / 04. The oil residue enters the gasifier 1 at the preset flow rate. At the same time, open the No. 1 oxygen shut-off valve XZV-X0011 and the No. 2 oxygen shut-off valve XZV-X0012, and control the flow of the single furnace oxygen pipeline at the corresponding ratio through the No. 2 flow sensor FZI-X0006. This allows the oil residue and oxygen to react in the gasifier 1 according to the process ratio, completing the pressurized continuous start-up and restoring the gasifier to normal production.

[0032] Table 1. Conditions for entering the feeding sequence from pressurized continuous feeding (one with parameter selection) Serial Number Position illustrate unit Required value 1 / Pressurized continuous casting button / Confirmation has been pressed. 2 PZT-X0043 Water washing tower outlet pipeline pressure MPa ＞1.3 3 PZI-X0010 Pressure difference between high-pressure steam and gasifier MPa ＞1.2 4 FZI-X0006 Process burner steam main flow rate kg / h ＞5000 5 FZI-X0002 / 03 / 04 Feed oil pump outlet flow rate kg / h ＞22000 6 FZI-X0012 Single furnace oxygen pipeline flow rate <![CDATA[Nm 3 / h]]> ＞16000 7 YL-P-X001 Feed pump operation signal / run 8 TI-X0032-37 Gasifier furnace temperature ℃ ＞900 In this embodiment, the entire process from triggering the pressurized continuous feed program to the gasifier resuming normal production takes only 18 minutes, which significantly shortens the start-up time compared to the existing technology's more than 4-hour refeeding cycle. At the same time, since there is no need for cooling, replacement, or re-baking the furnace, it saves 1200 m³ of nitrogen, 7 tons of steam, and 4.5 tons of oil residue, effectively reducing resource waste and production costs. Furthermore, the entire process does not interrupt the low-load operation of the upstream and downstream production systems, greatly reducing the impact of abnormal shutdowns on overall production.

[0033] If gasifier 1 shuts down due to abnormal reasons such as oxygen shut-off valve timeout or fluctuations in process parameters other than equipment damage, and the fault is resolved and all equipment is working normally, the pressurized continuous start-up control method of the present invention can be executed according to the above process, and the effect of rapid production recovery can be achieved.

[0034] Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A control device for pressurized continuous restart after abnormal shutdown of oil residue gasification, characterized in that, The system includes a gasifier (1), the inlet of which is connected to a No. 1 steam pipeline, an oxygen pipeline, a No. 2 steam pipeline, a feed oil pipeline, and a No. 6 pipeline. The outlet of the gasifier (1) is connected to a cyclone separator (2) via a No. 1 pipeline. The cyclone separator (2) is connected to a water washing tower (3) via a No. 2 pipeline. A No. 7 pipeline for conveying medium-pressure nitrogen is connected to the No. 2 pipeline. The outlet of the water washing tower (3) is connected to a No. 3 pipeline and a No. 4 pipeline. The No. 3 pipeline is connected to the subsequent system process, and the No. 4 pipeline is connected to the flare pipeline. The oxygen pipeline is connected in series with oxygen shut-off valve No. 1 (XZV-X0011) and oxygen shut-off valve No. 2 (XZV-X0012). The feed oil pipeline is connected in series with feed oil pump (P-X001) and feed oil shut-off valve No. 1 (XZV-X0001). The steam pipeline is connected in series with steam vent valve No. 1 (XZV-X0008), steam shut-off valve No. 1 (XZV-X0006), and steam shut-off valve No. 2 (XZV-X0007). The steam pipeline is connected in series with oil passage purging steam valve No. 1 (XZV-X0002) and oil passage purging steam valve No. 2 (XZV-X0004). The No. 6 pipeline is connected to the No. 1 medium-pressure nitrogen valve (XZV-X0025) and the No. 2 medium-pressure nitrogen valve (XZV-X0042), and the No. 7 pipeline is connected to the No. 3 medium-pressure nitrogen valve (XZV-X0034) and the No. 4 medium-pressure nitrogen valve (XZV-X0035).

2. The control equipment for pressurized continuous start-up after abnormal shutdown of oil residue gasification according to claim 1, characterized in that, Pipeline No. 1 is connected to Pipeline No.

5. Pipeline No. 5 is connected in parallel with start-up extraction valve No. 1 (XZV-X0014A) and start-up extraction valve No. 2 (XZV-X0014B). The outlet end of Pipeline No. 5 is connected to a silencer and an extraction device in sequence. The No. 3 pipeline is connected to the syngas remote control valve (HCV-X0043) at the outlet of the No. 1 water washing tower, and the No. 4 pipeline is connected in parallel to the No. 1 water washing tower outlet pressure regulating valve (PCV-X0043A) and the No. 2 water washing tower outlet pressure regulating valve (PCV-X0043B).

3. The control equipment for pressurized continuous start-up after abnormal shutdown of oil residue gasification according to claim 1, characterized in that, The gasifier (1) is equipped with a temperature sensor (TI-X0032-37) and a second pressure sensor (PZI-X0004). The temperature sensor (TI-X0032-37) is used to detect the furnace temperature of the gasifier in real time, and the second pressure sensor (PZI-X0004) is used to detect the furnace pressure of the gasifier in real time.

4. The control equipment for pressurized continuous start-up after abnormal shutdown of oil residue gasification according to claim 1, characterized in that, The No. 1 steam pipeline is equipped with a No. 1 pressure sensor (PZI-X0010) and a No. 1 flow sensor (FZI-X0006). The No. 1 pressure sensor (PZI-X0010) is used to detect the pressure difference between the high-pressure steam and the gasifier, and the No. 1 flow sensor (FZI-X0006) is used to detect the flow rate of the process burner steam main.

5. The control equipment for pressurized continuous start-up after abnormal shutdown of oil residue gasification according to claim 1, characterized in that, The oxygen pipeline is equipped with a second flow sensor (FZI-X0006), which is used to detect the flow rate of the oxygen pipeline in a single furnace; the feed oil pipeline is equipped with a third flow sensor (FZI-X0002 / 03 / 04), which is used to detect the outlet flow rate of the feed oil pump (P-X001); and the third pipeline is equipped with a pressure sensor (PZT-X0043) for the outlet pipeline of the water washing tower.

6. A control method for pressurized continuous start-up after abnormal shutdown of oil residue gasification based on the control equipment according to any one of claims 1-5, characterized in that, After an abnormal shutdown of the gasifier, the shutdown procedure is first executed to complete media isolation, system depressurization, and channel purging. Once purging is complete, and the set conditions are met, the pressurized continuous start-up procedure is manually triggered to enter the feeding procedure. The entire process does not require cooling, replacement, or re-baking of the gasifier, thus completing the pressurized continuous start-up.

7. The control method according to claim 6, characterized in that, The parking procedure specifically includes the following steps: Step 1) Oxygen isolation: Close the No. 1 oxygen shut-off valve (XZV-X0011) and the No. 2 oxygen shut-off valve (XZV-X0012) on the oxygen pipeline to cut off the oxygen supply to the gasifier (1); Step 2) Feed oil isolation: Stop the operation of the feed oil pump (P-X001), close the No. 1 feed oil shut-off valve (XZV-X0001) on the feed oil pipeline, and cut off the oil residue feed to the gasifier (1); Step 3) Syngas isolation: Close the syngas remote control valve (HCV-X0043) at the outlet of the No. 1 water washing tower on the No. 3 pipeline to prevent syngas from flowing back into the gasifier (1); Step 4) System depressurization: Open the outlet pressure regulating valve (PCV-X0043A) of the No. 1 water washing tower and the outlet pressure regulating valve (PCV-X0043B) of the No. 2 water washing tower on the No. 4 pipeline to reduce the pressure of the gasifier (1) and its supporting pipeline system to a safe range. Step 5) Oil passage purging: Open the No. 1 oil passage purging steam valve (XZV-X0002) and the No. 2 oil passage purging steam valve (XZV-X0004) on the No. 2 steam pipeline to introduce steam to purge the feed oil pipeline. The basic purging time is 3 minutes, which can be adjusted according to the actual running time of the gasifier. Step 6) Purging completion confirmation: After the purging time reaches the target, confirm that the abnormal shutdown fault has been dealt with and the conditions for pressurized continuous feeding are met, and prepare to enter the feeding sequence.

8. The control method according to claim 7, characterized in that, The feeding sequence specifically includes the following steps: Step 1) Close the start-up extraction: Close the No. 1 start-up extraction valve (XZV-X0014A) and the No. 2 start-up extraction valve (XZV-X0014B) on the No. 5 pipeline to terminate the start-up extraction operation and make the gasifier (1) form a closed pressurized environment. Step 2) Establish and stabilize the gasifier pressure: Keep the No. 1 medium-pressure nitrogen valve (XZV-X0025), No. 2 medium-pressure nitrogen valve (XZV-X0042) on pipeline No. 6, and the No. 3 medium-pressure nitrogen valve (XZV-X0034) and No. 4 medium-pressure nitrogen valve (XZV-X0035) on pipeline No. 7 in the open state. Use medium-pressure nitrogen to make the pressure of gasifier (1) rise naturally. Monitor the furnace pressure in real time through the No. 2 pressure sensor (PZI-X0004). With the coordinated control of the No. 1 water washing tower outlet pressure regulating valve (PCV-X0043A) and the No. 2 water washing tower outlet pressure regulating valve (PCV-X0043B), stabilize the furnace pressure of gasifier (1) at 1.3MPa. Step 3) Establish a stable steam flow: Open the No. 1 steam shut-off valve (XZV-X0006) and the No. 2 steam shut-off valve (XZV-X0007) on the No. 1 steam pipeline, close the No. 1 steam vent valve (XZV-X0008), and introduce steam into the gasifier (1); close the No. 1 medium-pressure nitrogen valve (XZV-X0025) and the No. 2 medium-pressure nitrogen valve (XZV-X0042) on the No. 6 pipeline, and the No. 3 medium-pressure nitrogen valve (XZV-X0034) and the No. 4 medium-pressure nitrogen valve (XZV-X0035) on the No. 7 pipeline, and then open the No. 1 oil passage purging steam valve (XZV-X0002) and the No. 2 oil passage purging steam valve (XZV-X0004) to purge for 60 seconds and then close them. Monitor and ensure the steam flow is stable through the No. 1 flow sensor (FZI-X0006); Step 4) Start feeding and resume production: Start the feed oil pump (P-X001), open the No. 1 feed oil shut-off valve (XZV-X0001), and control the feed oil pump outlet flow through the No. 3 flow sensor (FZI-X0002 / 03 / 04); at the same time, open the No. 1 oxygen shut-off valve (XZV-X0011) and the No. 2 oxygen shut-off valve (XZV-X0012), and control the single furnace oxygen pipeline flow through the No. 2 flow sensor (FZI-X0006) so that the oil residue and oxygen enter the gasifier (1) according to the process ratio, and complete the pressurized continuous start-up.

9. The control method according to claim 8, characterized in that, In step 2, when adjusting the pressure of the gasifier (1), the pressure of the No. 3 pipeline is monitored in real time by the pressure sensor (PZT-X0043) of the water washing tower outlet pipeline to help judge the stability of the system pressure. In conjunction with the No. 2 pressure sensor (PZI-X0004), the pressure of the gasifier furnace chamber is accurately controlled.

10. The control method according to any one of claims 6-9, characterized in that, The applicable scenarios for abnormal shutdowns are: feeding failures caused by the timeout of the No. 1 oxygen shut-off valve (XZV-X0011), No. 2 oxygen shut-off valve (XZV-X0012), No. 1 steam shut-off valve (XZV-X0006), and No. 2 steam shut-off valve (XZV-X0007) during feeding, or shutdowns caused by abnormal reasons other than equipment damage during normal operation of the gasifier, provided that the abnormal reasons have been resolved and all sensors and valves are functioning normally.

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