Liquid-phase material recovery device

Abstract

The utility model discloses a liquid-phase material recovery device which comprises a compressor low-pressure cylinder suction tank, a top gas-phase outlet of the compressor low-pressure cylinder suction tank is sequentially communicated with a compressor low-pressure cylinder, a compressor outlet cooler and a compressor high-pressure cylinder suction tank, and the compressor high-pressure cylinder suction tank is communicated with a compressor high-pressure cylinder through a suction pipeline. A discharge hole of the compressor high-pressure cylinder is communicated with a rectifying tower; the suction pipeline is provided with a liquid collection bag, a discharge port of the liquid collection bag is respectively communicated with a pipeline I and a pipeline II, a discharge end of the pipeline I is communicated with a waste liquid tank, and a discharge end of the pipeline II is communicated with a compressor low-pressure cylinder suction tank; a liquid phase outlet is formed in the bottom end of the compressor low-pressure cylinder suction tank and is communicated with the rectifying tower through a liquid phase material pump; the recovery device can effectively recover liquid-phase materials formed by pressurization of reaction gas at an outlet of the fixed bed reactor, and material loss is avoided.

Description

Technical Field

[0001] The utility model relates to the application field of high-temperature catalytic cracking technology, and specifically to a liquid-phase material recovery device. Background Art

[0002] Currently, several representative olefin catalytic cracking units worldwide all utilize fixed-bed reactors. The reaction gas exiting the fixed-bed reactor contains small amounts of C5 and C6 components. To improve unit efficiency, each unit pressurizes the reaction gas and sends it to a distillation tower for separation into different products. However, during the pressurization process, the distance between molecules decreases, the interaction forces increase, and the molecular kinetic energy decreases. When the molecular speed decreases to a certain level, a liquid is formed. Simultaneously, pressurization changes the phase transition temperature of the gas. As pressure increases, the phase transition temperature rises, and more heavy components are condensed after passing through the compressor condenser. To prevent the compressor from inhaling liquid and damaging it, existing Chinese technology uses a liquid collection bag in the suction line preceding the compressor. When the liquid level in the bag is high, the liquid is discharged as waste liquid into a waste liquid tank, resulting in partial material loss and affecting the unit's economic efficiency. Utility Model Content

[0003] In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a liquid phase recovery device which can effectively recover the liquid phase material formed by pressurizing the reaction gas at the outlet of the fixed bed reactor, thereby avoiding material loss.

[0004] In order to solve the above problems, the present invention provides the following technical solutions:

[0005] A liquid material recovery device comprises a compressor low-pressure cylinder suction tank, a gas phase outlet is provided at the top of the compressor low-pressure cylinder suction tank, the gas phase outlet is connected in sequence to the compressor low-pressure cylinder, the compressor outlet cooler and the compressor high-pressure cylinder suction tank, the compressor high-pressure cylinder suction tank is connected to the compressor high-pressure cylinder through a suction pipeline, and the discharge port of the compressor high-pressure cylinder is connected to a distillation tower; the suction pipeline is provided with a liquid collecting bag, the discharge port of the liquid collecting bag is respectively connected to pipeline one and pipeline two, the discharge end of pipeline one is connected to a waste liquid tank, the discharge end of pipeline two is connected to the compressor low-pressure cylinder suction tank, and valves are provided at the discharge end of the liquid collecting bag, pipeline one and pipeline two; a liquid phase outlet is provided at the bottom end of the compressor low-pressure cylinder suction tank, and the liquid phase outlet is connected to the distillation tower through a liquid phase material pump.

[0006] It should be noted that the utility model is a liquid material recovery device, which is mainly used in the field of high-temperature catalytic cracking technology in practical applications, and particularly relates to a device that uses carbon four and above components as raw materials and uses a fixed bed reactor to crack and produce the target product under high-temperature conditions. By optimizing the system, the material in the liquid collection bag is recovered and transported to the distillation tower, so as to achieve the purpose of recovering liquid phase materials, avoiding material losses, and increasing the economic benefits of the device.

[0007] The technical solution of the present invention also includes that the pipeline 2 is provided with a liquid phase pretreatment unit.

[0008] Preferably, the technical solution of the present invention also includes that the liquid phase pretreatment unit includes a pretreatment tank body, a feed port is provided at the top of the pretreatment tank body, a discharge port is provided at the bottom of the pretreatment tank body, and a filter and a dehydration device are provided in sequence from top to bottom inside the pretreatment tank body. The liquid pretreatment unit is a key component to ensure that the liquid in the liquid collection bag can enter the distillation tower safely and efficiently. It is mainly used to remove impurities in the liquid phase and adjust the state of the liquid phase to make it more suitable for the subsequent distillation process. The filter is used to remove solid particles, dust and other insoluble impurities. The dehydration device is used to remove moisture in the liquid phase. If the liquid phase contains moisture, it will have an adverse effect on the distillation process.

[0009] Furthermore, the technical solution of the present invention also includes that the filter is a screen filter or a filter element filter.

[0010] Preferably, the technical solution of the present invention further includes that a desiccant is provided in the dehydration device, and the desiccant is a molecular sieve desiccant.

[0011] The technical solution of the present invention also includes that a liquid level detection alarm is provided on the side wall of the liquid collecting bag to monitor the liquid level of the liquid collecting bag. When the liquid level reaches a warning level, an alarm is issued to remind the operator to discharge the liquid in time.

[0012] The technical solution of the present invention also includes that the liquid phase pretreatment unit and the liquid collection bag are both communicatively connected to a controller. The controller can realize automatic control of the liquid phase treatment unit and the liquid collection bag, thereby improving the automation level of the liquid phase material recovery device.

[0013] The beneficial effects of the present utility model are as follows: compared with the prior art, the purpose of the present utility model is to provide a liquid phase material recovery device applied to the field of high temperature catalytic cracking technology, and in particular relates to a device for producing target products by cracking carbon four and above components using a fixed bed reactor under high temperature conditions. By optimizing the system, the liquid phase material formed by pressurizing the reaction gas at the outlet of the fixed bed reactor can be effectively recovered, the material in the liquid collection bag can be recovered to the suction tank of the low-pressure cylinder of the compressor, and transported to the distillation tower, so as to achieve the purpose of recovering the liquid phase material, avoiding material loss, and increasing the economic benefits of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 It is a structural schematic diagram of a liquid phase material recovery device in a specific implementation manner.

[0016] Among them, 1 is the compressor low-pressure cylinder suction tank, 2 is the compressor low-pressure cylinder, 3 is the compressor outlet cooler, 4 is the compressor high-pressure cylinder suction tank, 5 is the suction pipeline, 6 is the compressor high-pressure cylinder, 7 is the controller, 8 is the liquid collection bag, 9 is the liquid level detection alarm, 10 is pipeline one, 11 is pipeline two, 12 is the dehydration device, 13 is the valve, 14 is the liquid phase outlet, 15 is the liquid phase material pump, 16 is the pretreatment tank, and 17 is the filter. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the purpose of simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] As can be seen from the accompanying drawings, a liquid material recovery device comprises a compressor low-pressure cylinder suction tank 1, a gas phase outlet is provided at the top of the compressor low-pressure cylinder suction tank 1, the gas phase outlet is connected to the compressor low-pressure cylinder 2, the compressor outlet cooler 3, and the compressor high-pressure cylinder suction tank 4 in sequence, the compressor high-pressure cylinder suction tank 4 is connected to the compressor high-pressure cylinder 6 through a suction pipeline 5, and the discharge port of the compressor high-pressure cylinder 6 is connected to a distillation tower; the suction pipeline 5 is provided with a liquid collecting bag 8, and the side wall of the liquid collecting bag 8 is provided with a liquid level detection alarm 9, the discharge port of the liquid collecting bag 8 is respectively connected to pipeline one 10 and pipeline two 11, the discharge end of pipeline one 10 is connected to a waste liquid tank, the discharge end of pipeline two 11 is connected to the compressor low-pressure cylinder suction tank 1, and the discharge end of the liquid collecting bag 8, pipeline one 10, and pipeline two 11 are all provided with valves 13; a liquid phase outlet 14 is provided at the bottom end of the compressor low-pressure cylinder suction tank 1, and the liquid phase outlet 14 is connected to the distillation tower through a liquid phase material pump 15.

[0020] Pipeline 2 11 is equipped with a liquid pretreatment unit, which includes a pretreatment tank 16. The top of pretreatment tank 16 is provided with a feed inlet, and the bottom of pretreatment tank 16 is provided with a discharge outlet. Inside pretreatment tank 16, from top to bottom, are a filter 17 and a dehydration device 12. Filter 17 is a cartridge filter, and dehydration device 12 is provided with a molecular sieve desiccant. Both the liquid pretreatment unit and liquid collection bag 8 are in communication with controller 7.

[0021] The gas phase from the top of the compressor low-pressure cylinder suction tank 1 enters the compressor low-pressure cylinder 2, and after being cooled by the compressor outlet cooler 3, enters the compressor high-pressure cylinder suction tank 4, the gas phase enters the compressor high-pressure cylinder 6, and the liquid phase enters the liquid collecting bag 8. When the liquid level of the liquid collecting bag 8 rises to the design value, open the valve of pipeline 10, and recover the liquid phase to the compressor low-pressure cylinder suction tank 1, and transport it to the distillation tower 7 through the liquid phase material pump 15.

[0022] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention shall be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A liquid phase material recovery device, characterized in that: It includes a compressor low-pressure cylinder suction tank, the top of the compressor low-pressure cylinder suction tank is provided with a gas phase outlet, the gas phase outlet is connected to the compressor low-pressure cylinder, the compressor outlet cooler, and the compressor high-pressure cylinder suction tank in sequence, the compressor high-pressure cylinder suction tank is connected to the compressor high-pressure cylinder through a suction pipeline, and the discharge port of the compressor high-pressure cylinder is connected to the distillation tower; the suction pipeline is provided with a liquid collecting bag, and the discharge port of the liquid collecting bag is respectively connected to pipeline one and pipeline two, the discharge end of pipeline one is connected to a waste liquid tank, and the discharge end of pipeline two is connected to the compressor low-pressure cylinder suction tank, and the discharge end of the liquid collecting bag, pipeline one and pipeline two are all provided with valves; the bottom end of the compressor low-pressure cylinder suction tank is provided with a liquid phase outlet, and the liquid phase outlet is connected to the distillation tower through a liquid phase material pump.

2. The liquid phase material recovery device according to claim 1, characterized in that: The pipeline 2 is provided with a liquid phase pretreatment unit.

3. The liquid phase material recovery device according to claim 2, characterized in that: The liquid phase pretreatment unit comprises a pretreatment tank body, a feed port is provided on the top of the pretreatment tank body, a discharge port is provided on the bottom of the pretreatment tank body, and a filter and a dehydration device are sequentially provided inside the pretreatment tank body from top to bottom.

4. The liquid phase material recovery device according to claim 3, characterized in that: The filter is a mesh filter or a cartridge filter.

5. The liquid phase material recovery device according to claim 3, characterized in that: The dehydration device is provided with a desiccant, which is a molecular sieve desiccant.

6. The liquid phase material recovery device according to claim 2, characterized in that: A liquid level detection alarm is provided on the side wall of the liquid collecting bag.

7. The liquid phase material recovery device according to claim 6, characterized in that: The liquid phase pretreatment unit and the liquid collection bag are both in communication connection with the controller.

Images