Atmospheric fractionating tower pressure balance control system
By designing a three-phase oil-water gas separation tank and a gas-rich compressor in an atmospheric fractionation tower, and using compressed gas to return to control the top pressure, the problems of gas-rich waste and introduction of low-pressure nitrogen in the prior art are solved, and the pressure stability and high pressure are achieved The production of quality fuel gas ensures environmental protection and economicality.
Patent Information
- Application Number
- CN202420322523.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-21
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-02-21
AI Technical Summary
The existing pressure control method for atmospheric fractionation towers has problems such as waste of rich gas and introduction of low-pressure nitrogen, which leads to pressure instability and fluctuations in fuel gas quality and poor economic performance.
A pressure balance control system for atmospheric fractionation tower is designed. Through the oil-water and gas three-phase separation tank, a gas-rich compressor and a product stabilization tower, the gas-rich compressor returns to the top of the tower to control the pressure, and the pressure detection remote transmission device and regulation are used. The valve achieves cascade control to ensure stable pressure and avoid the introduction of low-pressure nitrogen.
The combustion waste without rich gas emissions is achieved, the equipment is environmentally friendly and safe, the dry gas quality is improved, and the pressure stability and energy saving are ensured by recycling LPG product components.
Smart Images
Figure CN222218660U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of pressure control of atmospheric distillation towers, in particular to a pressure balance control system for atmospheric distillation towers. Background Art
[0002] Atmospheric distillation tower separation technology is widely used in petrochemical and coal chemical oil refining at home and abroad. Since the operating pressure of the atmospheric distillation tower of the oil refining unit is relatively low, generally close to atmospheric pressure but slightly higher than atmospheric pressure, there are usually multiple schemes for the pressure control of the atmospheric distillation tower. It is generally adopted that the top oil and gas of the distillation tower are condensed and cooled, and the top rich gas (C1~C8) is separated into three phases of oil, water and gas. The top non-condensable gas (C1~C4) is sent to the high / low pressure combustible gas pipeline network as the heating furnace fuel gas, or as the dry gas hydrogen production raw material by the first pressure control valve. The remaining part is sent to the flare gas pipeline network for discharge and combustion by the second pressure control valve to adjust and balance the production pressure stability of the upstream and downstream distillation systems; another method uses low-pressure nitrogen as a nitrogen seal to adjust the pressure of the top reflux tank to control the pressure of the top of the tower. These methods all have shortcomings, resulting in waste of rich gas or introduction of low-pressure nitrogen, which reduces the quality of rich gas and causes large fluctuations in the temperature control of each heating furnace user point, making it unusable, and having poor economic efficiency in the long run. Utility Model Content
[0003] The utility model overcomes the shortcomings of the prior art and provides a pressure balance control system for an atmospheric pressure fractionation tower.
[0004] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.
[0005] A pressure balance control system for an atmospheric distillation tower comprises an atmospheric distillation tower, an oil-water-gas three-phase separation tank, a rich gas compressor, and a product stabilization tower; the top of the atmospheric distillation tower is connected to the oil-water-gas three-phase separation tank through a first pipeline, the oil-water-gas three-phase separation tank is connected to the rich gas compressor through a non-condensable gas pipeline, the rich gas compressor is connected to the product stabilization tower, and the rich gas compressor is connected to the top of the atmospheric distillation tower through a return gas pipeline; the return gas pipeline is provided with a regulating valve, and a pressure detection remote transmission device is provided at the connection between the top of the atmospheric distillation tower and the return gas pipeline, and the pressure detection remote transmission device is electrically connected to the regulating valve to realize cascade control.
[0006] Preferably, the oil-water-gas three-phase separation tank is connected to the top of the atmospheric distillation tower through a cold reflux pipeline.
[0007] Preferably, a rich gas cooler and a rich gas air cooler are connected to the first pipeline.
[0008] Preferably, the rich gas compressor is connected to the oil-water-gas three-phase separation tank through a compressed liquid pipeline.
[0009] Preferably, the top of the product stabilization tower is connected to the fuel gas network through a pipeline.
[0010] Preferably, a condensate pipeline is connected to the bottom of the oil-water-gas three-phase separation tank, and the condensate pipeline is connected to a water treatment plant.
[0011] Preferably, an LPG finished oil recovery pipeline is connected to the top of the product stabilization tower.
[0012] Preferably, a naphtha / gasoline finished oil pipeline is connected to the bottom of the product stabilization tower.
[0013] The beneficial effects of the utility model compared with the prior art are:
[0014] (1) During normal production, the final dry gas (C1~C2) produced by the utility model only goes to the fuel gas pipeline network for heating furnace combustion, eliminating the emission and combustion waste of rich gas compressed gas components, and all other components enter the product. This can ensure the environmental protection and safety of the device, while achieving energy saving and consumption reduction.
[0015] (2) The utility model does not introduce inert gases such as low-pressure nitrogen. The rich gas compressed gas of the atmospheric distillation tower returns to the pressure of the atmospheric distillation tower top control tower, and the remaining part of the compressed gas enters the naphtha or gasoline product stabilization tower to recover the LPG product components, thereby ensuring the high quality of the dry gas (C1~C2).
[0016] (3) All compressed liquid is pressurized and returned to the reflux tank at the top of the distillation tower for circulation and separation, and 100% enters the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the structure of the pressure balance control system of the atmospheric distillation tower of the utility model;
[0018] In the figure:
[0019] 1 is a normal pressure distillation tower, 2 is an oil-water-gas three-phase separation tank, 3 is a rich gas compressor, 4 is a product stabilization tower, 5 is a non-condensable gas pipeline, 6 is a return gas pipeline, 7 is a regulating valve, 8 is a pressure detection remote transmission device, 9 is a cold reflux pipeline, 10 is a rich gas cooler, 11 is a rich gas air cooler, 12 is a compressed liquid pipeline, 13 is a condensate pipeline, 14 is an LPG finished oil recovery pipeline, and 15 is a naphtha / gasoline finished oil pipeline. DETAILED DESCRIPTION
[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.
[0021] like Figure 1 As shown, this embodiment provides a pressure balance control system for an atmospheric distillation tower, comprising an atmospheric distillation tower 1, an oil-water-gas three-phase separation tank 2, a rich gas compressor 3, and a product stabilization tower 4; the top of the atmospheric distillation tower 1 is connected to the oil-water-gas three-phase separation tank 2 through a first pipeline, and a rich gas cooler 10 and a rich gas air cooler 11 are connected to the first pipeline.
[0022] The oil-water-gas three-phase separation tank 2 is connected to the top of the atmospheric distillation tower 1 through a cold reflux pipeline 9, and the liquid phase in the oil-water-gas three-phase separation tank 2 is refluxed to the atmospheric distillation tower 1 through the cold reflux pipeline 9.
[0023] The oil-water-gas three-phase separation tank 2 is connected to the rich gas compressor 3 through the non-condensable gas pipeline 5, the rich gas compressor 3 is connected to the product stabilization tower 4, and the rich gas compressor 3 is connected to the top of the atmospheric distillation tower 1 through the return gas pipeline 6; the rich gas compressor 3 is connected to the oil-water-gas three-phase separation tank 2 through the compressed liquid pipeline 12, and the rich gas compressed liquid in the rich gas compressor 3 is refluxed to the oil-water-gas three-phase separation tank 2 through the compressed liquid pipeline 12.
[0024] The return gas pipeline 6 is provided with a regulating valve 7, and a pressure detection remote transmission device 8 is provided at the connection between the top of the atmospheric distillation tower 1 and the return gas pipeline 6. The pressure detection remote transmission device 8 is electrically connected to the regulating valve 7 to realize cascade control.
[0025] The top of the product stabilization tower 4 is connected to the fuel gas network through a pipeline;
[0026] The bottom of the oil-water-gas three-phase separation tank 2 is connected to a condensate pipeline 13, and the condensate pipeline 13 is connected to a water treatment plant;
[0027] The top of the product stabilization tower 4 is connected to an LPG finished oil recovery pipeline 14 ; the bottom of the product stabilization tower 4 is connected to a naphtha / gasoline finished oil pipeline 15 .
[0028] The working principle of the utility model is:
[0029] The top gas of the atmospheric distillation tower 1 is cooled to below 40°C by the rich gas cooler 10 and the rich gas air cooler 11, and enters the oil-water-gas three-phase separation tank 2 connected to the top of the atmospheric distillation tower 1 for oil-water-gas three-phase separation. After the gas phase is compressed to 1.0-1.6MPa and 70-105°C by the liquid separator of the rich gas compressor 3 and the tail gas compressor, part of the compressed gas returns to the top of the atmospheric distillation tower 1 (or the condenser inlet) to control the tower pressure, and part of the compressed gas enters the naphtha or gasoline product stabilization tower 4 to recover LPG, naphtha or gasoline product components.
[0030] A pressure detection remote transmission device 8 and a regulating valve 7 on the top pipeline of the atmospheric distillation tower 1 are installed for cascade control to automatically adjust the top pressure of the tower.
[0031] The system recycles 100% of the atmospheric distillation tower top rich gas and its compressed gas, without introducing inert gas. The dry gas is used as the high-quality fuel gas produced by the device, which can ensure the environmental protection and safety of the device, while achieving energy saving and consumption reduction. The atmospheric distillation tower top pressure is controlled by the return of self-produced rich gas compressed gas. The process is simple, cascade control is adopted, and the automatic control is stable.
[0032] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.
Claims
1. A pressure balance control system for an atmospheric distillation tower, characterized in that: The invention comprises an atmospheric pressure fractionation tower (1), an oil-water-gas three-phase separation tank (2), a rich gas compressor (3), and a product stabilization tower (4); the top of the atmospheric pressure fractionation tower (1) is connected to the oil-water-gas three-phase separation tank (2) through a first pipeline, the oil-water-gas three-phase separation tank (2) is connected to the rich gas compressor (3) through a non-condensable gas pipeline (5), the rich gas compressor (3) is connected to the product stabilization tower (4), and the rich gas compressor (3) is connected to the top of the atmospheric pressure fractionation tower (1) through a return gas pipeline (6); the return gas pipeline (6) is provided with a regulating valve (7), and a pressure detection remote transmission device (8) is provided at the connection between the top of the atmospheric pressure fractionation tower (1) and the return gas pipeline (6), and the pressure detection remote transmission device (8) is electrically connected to the regulating valve (7) to realize cascade control.
2. The atmospheric distillation tower pressure balance control system according to claim 1, characterized in that: The oil-water-gas three-phase separation tank (2) is connected to the top of the atmospheric distillation tower (1) via a cold reflux pipeline (9).
3. The atmospheric distillation tower pressure balance control system according to claim 1, characterized in that: A rich gas cooler (10) and a rich gas air cooler (11) are connected to the first pipeline.
4. The atmospheric distillation tower pressure balance control system according to claim 1, characterized in that: The rich gas compressor (3) is connected to the oil-water-gas three-phase separation tank (2) via a compressed liquid pipeline (12).
5. The atmospheric distillation tower pressure balance control system according to claim 1, characterized in that: The top of the product stabilization tower (4) is connected to the fuel gas pipeline network through a pipeline.
6. The atmospheric distillation tower pressure balance control system according to claim 1, characterized in that: A condensate pipeline (13) is connected to the bottom of the oil-water-gas three-phase separation tank (2), and the condensate pipeline (13) is connected to a water treatment plant.
7. The atmospheric distillation tower pressure balance control system according to claim 1, characterized in that: The top of the product stabilization tower (4) is connected to an LPG finished oil recovery pipeline (14).
8. The atmospheric distillation tower pressure balance control system according to claim 1, characterized in that: The bottom of the product stabilization tower (4) is connected to a naphtha / gasoline finished oil pipeline (15).