Hybrid light hydrocarbon comprehensive utilization combined device

Abstract

The utility model belongs to coal chemical industry and oil refining chemical industry technical field especially, it is a kind of mixed light hydrocarbon comprehensive utilization combination device, including frame and main road pipe, the upper surface of frame is provided with processing mechanism, processing mechanism includes heat exchanger, heat exchanger realizes the cooling treatment of gas by the indirect heat exchange of circulating cooling water and gas, by setting mixing mechanism, the full mixing of gas is realized, the flange of both ends of mixing pipe is connected with the flange of main road pipe and the flange of inlet pipe respectively by bolt, and the flange junction is provided with sealing gasket, and it is sealed, prevents medium seepage, and the baffle is staggered distribution in up and down, and airflow is constantly changing flow direction when passing through staggered distribution baffle, forms turbulent flow, promotes the full mixing of steam, multiple round holes are set up on baffle, and round hole design allows airflow to pass through, further refines airflow simultaneously, enhances mixing effect.

Description

Technical Field

[0001] This utility model relates to the fields of coal chemical and oil refining chemical technology, and in particular to a combined device for the comprehensive utilization of mixed light hydrocarbons. Background Technology

[0002] Mixed light hydrocarbons refer to the lighter portion of a series of substances composed of carbon and hydrogen in different proportions. The main components are C3 to C5 hydrocarbon compounds. These mixtures are usually low molecular weight hydrocarbons produced in oil refineries or natural gas liquefaction processes. They have the characteristics of high calorific value and good combustion performance. The cracked gas compressor is the core equipment for processing mixed light hydrocarbons. The gas from the fifth stage outlet of the cracked gas compressor first enters the E-1357 circulating water heat exchanger, where it is cooled to the required temperature by circulating water. The cooled cracked gas then enters the arsenic removal and retention bed for arsenic removal treatment. The arsenic-removed gas enters the inlet of the E-1363 C2 hydrogenation feed heater for heating. After being heated, it enters the C2 hydrogenation reactor, where impurities such as acetylene in the gas are hydrogenated to ethylene, increasing the yield of the target product, such as ethylene.

[0003] In existing technologies, the gas is not diverted but is cooled entirely by a circulating water heat exchanger and then heated by a C2 hydrogenation feed heater. This results in excessive heat load, high energy consumption, and increased equipment investment and operating costs. Furthermore, the arsenic removal process in the arsenic removal and retention bed requires extremely high uniformity and stability of the inlet temperature. Uneven temperature will affect the arsenic removal effect. Therefore, a combined device for the comprehensive utilization of mixed light hydrocarbons is proposed to solve the above-mentioned problems. Utility Model Content

[0004] In order to address the technical problems in the existing technology where the gas is cooled by a circulating water heat exchanger and then heated by a C2 hydrogenation feed heater, resulting in excessive heat load, and the fact that arsenic removal in the arsenic removal and retention bed requires extremely high uniformity and stability of the inlet temperature, and that uneven temperature will affect the arsenic removal effect, this application provides a combined device for the comprehensive utilization of mixed light hydrocarbons.

[0005] This utility model proposes a combined device for the comprehensive utilization of mixed light hydrocarbons, including a frame and a main pipeline. The upper surface of the frame is provided with a processing mechanism, which includes a heat exchanger. The heat exchanger achieves gas cooling through indirect heat exchange between circulating cooling water and the gas.

[0006] The upper surface of the frame is provided with a mixing mechanism, which includes baffles. The gas is agitated by the staggered arrangement of the baffles to achieve thorough mixing of the gas.

[0007] Preferably, the processing mechanism further includes an arsenic removal tank, which is fixedly installed on the front upper surface of the frame by bolts, and an air inlet pipe is fixedly connected to the outer air inlet end of the arsenic removal tank.

[0008] Preferably, the heat exchanger is fixedly mounted on the upper rear surface of the frame by bolts, and a three-way diverter valve is provided in the middle section of the main pipeline.

[0009] Preferably, the upper valve port of the three-way diverter valve is fixedly connected to the gas inlet of the heat exchanger via a pipe, the gas outlet of the heat exchanger is fixedly connected to the outer branch pipe of the main pipe via a pipe, and a one-way valve is provided at the end of the pipe of the gas outlet of the heat exchanger.

[0010] Preferably, the mixing mechanism further includes a mixing pipe, one end flange of which is fastened to one end flange of the main pipe by bolts, and the other end flange of the mixing pipe is fastened to one end flange of the air intake pipe by bolts. A sealing gasket is provided at the flange connection of both ends of the mixing pipe.

[0011] Preferably, the partition is welded to the inner wall of the mixing pipe, and the outer surface of the partition has a circular hole.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. By setting up a processing mechanism, the gas is cooled. The arsenic removal tank removes impurities such as arsenides from the mixed light hydrocarbon gas entering through the inlet pipe, preventing catalyst poisoning and protecting downstream equipment and catalyst activity. The heat exchanger cools the gas through indirect heat exchange between circulating cooling water and the gas, providing suitable temperature conditions for subsequent processes. The upper valve port of the three-way diverter is fixedly connected to the gas inlet of the heat exchanger through a pipeline, diverting part of the gas in the main pipeline to the heat exchanger for cooling, controlling the gas flow and temperature entering the subsequent processes. The gas outlet of the heat exchanger is fixedly connected to the outer branch pipe of the main pipeline through a pipeline, returning the cooled gas to the main pipeline to mix with the uncooled main pipeline gas, ensuring uniform overall gas flow temperature. A one-way valve is installed at the end of the heat exchanger pipeline to prevent backflow of the medium. This solves the technical problem in the existing technology where the gas is not diverted but is cooled entirely by the circulating water heat exchanger and then heated by the C2 hydrogenation feed heater, which leads to excessive heat load, high energy consumption, and increased equipment investment and operating costs.

[0014] 2. By setting up a mixing mechanism, the gas is fully mixed. The flanges at both ends of the mixing pipe are connected to the flanges of the main pipeline and the inlet pipeline respectively by bolts. Sealing gaskets are set at the flange connections to seal them and prevent media leakage. The baffles are distributed vertically and vertically. When the airflow passes through the staggered baffles, it continuously changes its flow direction, forming turbulence and promoting the full mixing of steam. Multiple round holes are opened on the baffles. The design of the round holes allows the airflow to pass through and further refines the airflow, enhancing the mixing effect. When the airflow passes through the round holes, it is divided into multiple fine streams, increasing the contact area of ​​the airflow and improving the mixing efficiency. This solves the technical problem in the existing technology that the arsenic removal and retention bed requires extremely high uniformity and stability of the inlet temperature, and that uneven temperature will affect the arsenic removal effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a combined device for the comprehensive utilization of mixed light hydrocarbons proposed in this utility model;

[0016] Figure 2 This is a perspective view of the heat exchanger structure of a combined device for comprehensive utilization of mixed light hydrocarbons proposed in this utility model;

[0017] Figure 3 This is a perspective view of the arsenic removal tank structure of a combined device for comprehensive utilization of mixed light hydrocarbons proposed in this utility model;

[0018] Figure 4 This is a perspective view of the air inlet pipe structure of a combined device for comprehensive utilization of mixed light hydrocarbons proposed in this utility model.

[0019] Figure 5 This is a perspective view of the circular hole structure of a combined device for the comprehensive utilization of mixed light hydrocarbons proposed in this utility model.

[0020] In the diagram: 1. Frame; 11. Main pipe; 2. Arsenic removal tank; 21. Inlet pipe; 3. Heat exchanger; 31. Three-way diverter valve; 4. Check valve; 5. Mixing pipe; 51. Sealing gasket; 6. Partition plate; 61. Round hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figures 1-5 A combined device for the comprehensive utilization of mixed light hydrocarbons includes a frame 1 and a main pipeline 11. A processing mechanism is provided on the upper surface of the frame 1. The processing mechanism includes a heat exchanger 3. The heat exchanger 3 achieves gas cooling through indirect heat exchange between circulating cooling water and gas.

[0023] To remove impurities such as arsenic from the mixed light hydrocarbon gas entering through the inlet pipe 21, the treatment mechanism also includes an arsenic removal tank 2. The arsenic removal tank 2 is fixedly installed on the upper front surface of the frame 1 by bolts. The outer inlet end of the arsenic removal tank 2 is fixedly connected to the inlet pipe 21. The arsenic removal tank 2 is fixedly installed to the frame 1 by bolts, which facilitates disassembly while fixing it. The arsenic removal tank 2 removes impurities such as arsenic from the mixed light hydrocarbon gas entering through the inlet pipe 21, preventing catalyst poisoning and protecting downstream equipment and catalyst activity. Its tank body is mostly made of carbon steel, with the inner wall lined with corrosion-resistant materials such as rubber or polytetrafluoroethylene. The specific model needs to be selected according to the processing capacity. A standard fixed bed arsenic removal tank 2 is required. It needs to be equipped with an arsenic adsorbent, such as a copper-based adsorbent. The adsorbent needs to be replaced regularly, and an inlet and outlet pressure difference monitoring instrument is required to determine the saturation state of the adsorbent. The frame 1 and the inlet pipe 21 are both made of stainless steel, which has strong corrosion resistance and is suitable for humid or corrosive environments.

[0024] To achieve fluid diversion control, heat exchanger 3 is bolted to the upper rear end of frame 1. A three-way diversion valve 31 is installed in the middle section of the main pipeline 11. Heat exchanger 3 is bolted to frame 1, facilitating both fixation and disassembly. Heat exchanger 3 achieves gas cooling through indirect heat exchange between circulating cooling water and gas, providing suitable temperature conditions for subsequent processes. Its shell is typically made of carbon steel or stainless steel, while the heat exchange tubes are mostly made of stainless steel or copper alloy. Wide-channel plate heat exchanger 3 can be selected; the specific model needs to be selected according to actual requirements, and it should be equipped with a circulating cooling system. A circulating water system, temperature control sensor, and automatic regulating valve are used to achieve precise temperature control. A three-way diverter valve 31 is installed in the middle section of the main pipeline 11 to achieve fluid diversion control and adjust the flow ratio between the heat exchanger 3 and the downstream section of the main pipeline. The main pipeline 11 is also made of stainless steel. The three-way diverter valve 31 can be a Q645F-25P pneumatic three-way diverter valve 31. This model has a pneumatic actuator and can achieve remote automatic control. It needs to be matched with a PLC control system or DCS system. Through temperature and pressure signal feedback, the valve opening is automatically adjusted to achieve intelligent diversion.

[0025] To control the gas flow rate and temperature entering subsequent processes, the upper valve port of the three-way diverter valve 31 is fixedly connected to the gas inlet of the heat exchanger 3 via a pipeline, and the gas outlet of the heat exchanger 3 is fixedly connected to the outer branch pipe of the main pipeline 11 via a pipeline. A one-way valve 4 is installed at the end of the gas outlet pipeline of the heat exchanger 3. The upper valve port of the three-way diverter valve 31 is fixedly connected to the gas inlet of the heat exchanger 3 via a pipeline, diverting a portion of the gas in the main pipeline 11 to the heat exchanger 3 for cooling. This controls the gas flow rate and temperature entering subsequent processes. By diverting the flow, the problem of excessive heat load caused by full-flow cooling is avoided, energy consumption is reduced, and system operation is improved. For efficiency, the gas outlet of heat exchanger 3 is fixedly connected to the outer branch pipe of main pipe 11 through a pipeline. This connection point is located after the three-way diverter valve 31, which sends the cooled gas back to main pipe 11 to mix with the uncooled main gas, ensuring uniform overall airflow temperature. A one-way valve 4 is installed at the end of the pipeline through heat exchanger 3 to prevent backflow of the medium. An H76H type electric check valve can be selected, which has a remote switching function for easy automated management. It needs to be linked with the control system and automatically opens and closes according to the system pressure signal. All pipelines in the processing mechanism can be made of stainless steel, and the connection can be installed by bolts, flanges and gaskets for subsequent maintenance.

[0026] By setting up a processing mechanism, the gas is cooled down. The arsenic removal tank 2 removes impurities such as arsenides from the mixed light hydrocarbon gas entering through the inlet pipe 21, preventing catalyst poisoning and protecting downstream equipment and catalyst activity. The heat exchanger 3 cools the gas through indirect heat exchange between circulating cooling water and the gas, providing suitable temperature conditions for subsequent processes. The upper valve port of the three-way diverter valve 31 is fixedly connected to the gas inlet of the heat exchanger 3 through a pipeline, diverting part of the gas in the main pipeline 11 to the heat exchanger 3 for cooling and controlling its entry into subsequent processes. The gas flow rate and temperature are controlled. The gas outlet of heat exchanger 3 is fixedly connected to the outer branch pipe of the main pipe 11 through a pipeline, so that the cooled gas is transported back to the main pipe 11 and mixed with the uncooled main gas to ensure uniform temperature of the overall airflow. A one-way valve 4 is installed at the end of the pipeline of heat exchanger 3 to prevent backflow of the medium. This solves the technical problem in the prior art that the gas is not diverted but is cooled by the circulating water heat exchanger 3 and then heated by the C2 hydrogenation feed heater, which will lead to excessive heat load, high energy consumption, and increased equipment investment and operating costs.

[0027] In order to achieve thorough mixing of the gas, a mixing mechanism is provided on the upper surface of the frame 1. The mixing mechanism includes a partition 6, which agitates the gas flow by staggering the upper and lower parts of the partition 6 to achieve thorough mixing of the gas.

[0028] To prevent media leakage, the mixing mechanism also includes a mixing pipe 5. One end flange of the mixing pipe 5 is bolted to one end flange of the main pipe 11, and the other end flange of the mixing pipe 5 is bolted to one end flange of the air inlet pipe 21. Sealing gaskets 51 are provided at both ends of the flange connection of the mixing pipe 5. The two ends of the flange of the mixing pipe 5 are bolted to the flanges of the main pipe 11 and the air inlet pipe 21 respectively, which not only fixes them but also facilitates disassembly. The sealing gaskets 51 at the flange connection seal them and prevent media leakage. The sealing gaskets 51 are made of graphite, which has good elasticity and sealing performance, and can effectively prevent media leakage. Graphite can also maintain stable sealing performance in high-temperature environments, making it suitable for high-temperature steam conditions. The mixing pipe 5 is made of stainless steel, which has good resistance to acid and alkali corrosion and is suitable for mixing light hydrocarbons and other sulfur- or arsenic-containing media.

[0029] To enhance the mixing effect, baffles 6 are welded to the inner wall of mixing pipe 5. Circular holes 61 are opened on the outer surface of baffles 6. The baffles 6 are fixed to mixing pipe 5 by welding. The baffles 6 are also made of stainless steel. The baffles 6 are staggered vertically. When the airflow passes through the staggered baffles 6, it continuously changes its flow direction, forming turbulence, promoting full mixing of steam, avoiding direct airflow, reducing dead corners in mixing pipe 5, and ensuring uniform mixing. Multiple circular holes 61 are opened on the baffles 6. The design of the circular holes 61 allows airflow to pass through while further refining the airflow and enhancing the mixing effect. When the airflow passes through the circular holes 61, it is divided into multiple fine streams, increasing the contact area of ​​the airflow and improving the mixing efficiency.

[0030] By setting up a mixing mechanism, the gas is fully mixed. The flanges at both ends of the mixing pipe 5 are connected to the flanges of the main pipe 11 and the inlet pipe 21 respectively by bolts. A sealing gasket 51 is set at the flange connection to seal it and prevent the medium from leaking. The baffles 6 are distributed vertically and vertically. When the airflow passes through the staggered baffles 6, it continuously changes its flow direction and forms turbulence, which promotes the full mixing of steam. Multiple round holes 61 are opened on the baffles 6. The design of the round holes 61 allows the airflow to pass through, while further refining the airflow and enhancing the mixing effect. When the airflow passes through the round holes 61, it is divided into multiple fine streams, which increases the contact area of ​​the airflow and improves the mixing efficiency. This solves the technical problem in the prior art that the arsenic removal and retention bed requires extremely high uniformity and stability of the inlet temperature, and that uneven temperature will affect the arsenic removal effect.

[0031] Working principle: The mixed light hydrocarbon gas from the fifth stage outlet of the cracked gas compressor enters the main pipeline 11. The three-way diverter valve 31 of the main pipeline 11 adjusts the ratio of the gas flow rate entering the heat exchanger 3 to the gas flow rate directly entering the subsequent process according to the instructions of the control system. The control system monitors the gas temperature at the outlet of the heat exchanger 3 through a temperature sensor and adjusts the opening of the three-way diverter valve 31 in real time to ensure that the temperature of the cooled gas meets the process requirements.

[0032] Part of the gas enters the heat exchanger 3 through the upper valve port of the three-way diverter valve 31. The heat exchanger 3 achieves gas cooling through indirect heat exchange with circulating cooling water. The cooled gas is discharged from the gas outlet of the heat exchanger 3 and merges with the outer branch pipe of the main pipe 11 through the pipeline. The one-way valve 4 installed at the end of the gas outlet pipe of the heat exchanger 3 prevents the cooled gas from flowing back to the heat exchanger 3. The one-way valve 4 is linked with the control system and automatically opens and closes according to the system pressure signal to ensure unidirectional gas flow.

[0033] The cooled gas and the uncooled gas merge before entering the mixing pipe 5 of the main pipe 11. As the airflow passes through the staggered baffles 6, it continuously changes its direction, forming turbulence and promoting full mixing of the gas. The circular holes 61 on the baffles 6 are designed to allow the airflow to pass through, while further refining the airflow and enhancing the mixing effect. The mixed gas enters the arsenic removal tank 2 through the air inlet pipe 21.

[0034] Arsenic removal tank 2 is filled with copper-based adsorbent. When the gas passes through the tank, impurities such as arsenides are adsorbed by the adsorbent, thus achieving arsenic removal. The arsenic-removed gas is discharged from the outlet of arsenic removal tank 2 and enters the downstream process. The downstream process has strict requirements on parameters such as gas purity, temperature, and pressure. This device ensures that the gas meets the feed requirements of the downstream process through arsenic removal, cooling, and mixing. If the downstream process generates tail gas, it needs to enter the tail gas treatment system to ensure that it meets the emission standards. The tail gas treatment system is linked with the control system of this device to achieve fully automated control of the entire process.

[0035] A PLC programmable logic controller is used as the core control unit, which is responsible for receiving sensor signals, executing control logic, and outputting control commands. Temperature sensors monitor the outlet gas temperature of heat exchanger 3 and the inlet and outlet gas temperatures of arsenic removal tank 2. Pressure sensors monitor the gas pressure in the main pipeline 11, heat exchanger 3, and arsenic removal tank 2. Flow meters monitor the gas flow rate entering heat exchanger 3 and directly entering subsequent processes. Differential pressure monitoring instruments monitor the inlet and outlet pressure difference of arsenic removal tank 2 to determine the adsorbent saturation state. Three-way diverter valve 31 adjusts the gas flow distribution according to control commands. Check valve 4 automatically opens and closes according to the system pressure signal. An alarm device issues an alarm signal in abnormal conditions.

[0036] Equipped with HMI touch screen or host computer monitoring software, it can achieve the following functions: real-time display of process parameters, such as temperature, pressure, flow rate, differential pressure, etc.; historical data query and trend analysis; alarm record and query; and manual / automatic control mode switching.

[0037] Main power supply: The entire device is powered by an industrial three-phase AC power supply (380V / 50Hz), and the power is distributed to each device through a distribution cabinet;

[0038] Power supply for control equipment: PLC / DCS, sensors, actuators and other control equipment are powered by 24V DC power supply. UPS (Uninterruptible Power Supply) provides backup power to the control system to ensure that the control system can continue to operate for a period of time in the event of a main power failure.

[0039] During normal operation, the device is in automatic control mode. The PLC automatically adjusts the actuators such as the three-way diverter valve 31 and the one-way valve 4 according to the preset program and real-time sensor signals to achieve stable control of process parameters.

[0040] During commissioning, maintenance, or emergency situations, the system can be switched to manual control mode, allowing operators to manually control valves, pumps, and other equipment via HMI or on-site operation buttons.

[0041] It supports remote monitoring and operation via industrial Ethernet or wireless communication, and can be connected to the factory's MES (Manufacturing Execution System) or SCADA (Supervisory and Data Acquisition System) to achieve centralized management and control of the entire plant;

[0042] Replace the adsorbent in the arsenic removal tank 2 according to the differential pressure monitoring results or operating cycle, check whether the inner wall lining of the tank is intact, and repair it in time if there is any damage. Clean the heat exchange tubes of the heat exchanger 3 regularly to prevent scaling from affecting the heat exchange efficiency. Check whether the sealing gasket 51 at the flange connection is aging and replace it if necessary. Regularly calibrate the temperature sensor, pressure sensor, flow meter and other detection instruments, and check whether the actuator of the three-way diverter valve 31 and the electric check valve is flexible and whether the seal is good.

[0043] When a leak is found at the flange connection, tighten the bolts or replace the sealing gasket 51. When the pipe or equipment body leaks, repair it by welding or replacing the parts. When the detection instrument is faulty, replace or calibrate it in time to ensure the accuracy of the control system. When the PLC system is faulty, professional technicians shall investigate and repair it. If necessary, switch to manual control mode to maintain operation.

[0044] The electronic devices, their power supply methods, and control methods described in this article are all existing technologies with mature applications. Therefore, they will only be briefly explained here without further elaboration.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A combined device for the comprehensive utilization of mixed light hydrocarbons, comprising a frame (1) and a main pipeline (11), characterized in that: The upper surface of the frame (1) is provided with a processing mechanism, which includes a heat exchanger (3). The heat exchanger (3) achieves gas cooling through indirect heat exchange between circulating cooling water and gas. The upper surface of the frame (1) is provided with a mixing mechanism, which includes a partition (6). The gas is disturbed by the staggered distribution of the partition (6) to achieve full mixing of the gas.

2. The combined device for comprehensive utilization of mixed light hydrocarbons according to claim 1, characterized in that: The processing mechanism also includes an arsenic removal tank (2), which is fixedly installed on the upper front surface of the frame (1) by bolts, and the outer air inlet end of the arsenic removal tank (2) is fixedly connected to an air inlet pipe (21).

3. The combined device for comprehensive utilization of mixed light hydrocarbons according to claim 1, characterized in that: The heat exchanger (3) is fixedly installed on the upper rear end of the frame (1) by bolts, and a three-way diversion valve (31) is provided in the middle section of the main pipeline (11).

4. The combined device for comprehensive utilization of mixed light hydrocarbons according to claim 3, characterized in that: The upper valve port of the three-way diverter valve (31) is fixedly connected to the gas inlet of the heat exchanger (3) through a pipe, and the gas outlet of the heat exchanger (3) is fixedly connected to the outer branch pipe of the main pipe (11) through a pipe. A one-way valve (4) is provided at the end of the pipe of the gas outlet of the heat exchanger (3).

5. A combined device for comprehensive utilization of mixed light hydrocarbons according to claim 2, characterized in that: The mixing mechanism also includes a mixing pipe (5), one end flange of the mixing pipe (5) is fastened to one end flange of the main pipe (11) by bolts, and the other end flange of the mixing pipe (5) is fastened to one end flange of the air intake pipe (21) by bolts. Both ends of the mixing pipe (5) are provided with sealing gaskets (51).

6. The combined device for comprehensive utilization of mixed light hydrocarbons according to claim 5, characterized in that: The partition (6) is welded to the inner wall of the mixing pipe (5), and a round hole (61) is provided on the outer surface of the partition (6).

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