Energy-saving acrylic acid production system
By designing an energy-saving acrylic production system that directly transports gas-phase propylene, the problem of large water and electricity consumption in traditional production processes is solved, and significant energy-saving effects are achieved.
Patent Information
- Application Number
- CN202421531916.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-05-20
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The propylene needs to be vaporized during the acrylic production process, resulting in large water consumption and large electricity consumption.
An energy-saving acrylic production system is designed, and the gas-phase propylene produced by the propane dehydrogenation device is directly transported to the acrylic production device through the first pipeline, avoiding the condensation and vaporization process of the liquid phase propylene. The system includes a pressure stabilizer tank and a pressure reducing valve set for regulating the pressure and flow rate of the gas-phase propylene.
It saves water consumption of circulating water and power consumption of liquid-phase propylene conveying pumps, reduces equipment use and consumption, and achieves the purpose of effective energy saving.
Smart Images
Figure CN222887337U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of acrylic acid production equipment, in particular to an energy-saving acrylic acid production system. Background Art
[0002] Acrylic acid is an important organic synthesis raw material and synthetic resin monomer, and is an ethylene monomer with a very fast polymerization rate. It is the simplest unsaturated carboxylic acid, consisting of a vinyl group and a carboxyl group. It is miscible with water, alcohols, ethers and chloroform, and is prepared from propylene obtained from an oil refinery. Most of it is used to manufacture acrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, and hydroxyethyl acrylate. Acrylic acid and its esters can be homopolymerized and copolymerized, and their polymers are used in industrial sectors such as synthetic resins, synthetic fibers, superabsorbent resins, building materials, and coatings.
[0003] During the production process of acrylic acid, gaseous propylene needs to be introduced for reaction. In a propane dehydrogenation unit for producing propylene, the propylene product is gaseous propylene which becomes liquid propylene after cooling, and then enters a storage tank for downstream use. The traditional feeding method of propylene in an acrylic acid production unit is that liquid propylene is transported through a pipeline by a transfer pump, vaporized by a vaporizer, undergoes a phase change from liquid propylene to gaseous propylene, and then is superheated by a superheater and enters the downstream pipeline to participate in the reaction to produce acrylic acid. The propylene vaporizer in this process needs to consume circulating water for vaporization, with a large water consumption, and the liquid propylene transfer pump has a large power consumption. Summary of the Utility Model
[0004] The purpose of the utility model is to provide an energy-saving acrylic acid production system to solve the problems of large water consumption and large power consumption caused by the need to vaporize propylene in the existing acrylic acid production process. The energy-saving acrylic acid production system of the utility model saves the circulating water consumption, saves the power consumption of the liquid propylene transfer pump, and reduces the use of equipment and equipment consumption, achieving the purpose of effective energy saving.
[0005] An energy-saving acrylic acid production system provided by the utility model includes a first pipeline, a pressure stabilizing tank and a pressure reducing valve group. The first end of the first pipeline is connected to the gaseous propylene produced by a propane dehydrogenation unit, the second end of the first pipeline is connected to the inlet end of the pressure stabilizing tank, the pressure reducing valve group is arranged on the first pipeline, and the outlet end of the pressure stabilizing tank is connected to an acrylic acid production unit.
[0006] As a preferred solution of the utility model, the pressure reducing valve group includes a first pressure reducing valve and a second pressure reducing valve. The first pressure reducing valve is arranged on the first pipeline, and the second pressure reducing valve is arranged in parallel with the first pressure reducing valve through a bypass pipeline.
[0007] As a preferred embodiment of the present utility model, it further includes a second pipeline and a steam superheater. The first end of the second pipeline is connected to the outlet end of the pressure stabilizing tank, and the second end of the second pipeline is connected to the steam superheater.
[0008] As a preferred embodiment of the present utility model, a cut-off valve is further provided on the first pipeline, and the cut-off valve is connected to the first pipeline at the front end of the pressure reducing valve group.
[0009] As a preferred embodiment of the present utility model, a pressure sensor is provided in the pressure stabilizing tank, and the pressure sensor, the pressure reducing valve group and the cut-off valve are all connected to a controller.
[0010] As a preferred embodiment of the present utility model, the steam superheater is connected to a steam pipeline, and water vapor and gaseous propylene exchange heat in a countercurrent manner in the steam superheater.
[0011] As a preferred embodiment of the present utility model, a first control valve is provided at the second end of the first pipeline, and the first control valve is provided at the inlet end of the pressure stabilizing tank.
[0012] As a preferred embodiment of the present utility model, a second control valve is provided at the first end of the second pipeline, and the second control valve is provided at the outlet end of the pressure stabilizing tank.
[0013] Compared with the prior art, the present utility model has the following positive effects:
[0014] The energy-saving acrylic acid production system provided by the present utility model includes a first pipeline, a pressure stabilizing tank and a pressure reducing valve group. The first end of the first pipeline is connected to the gaseous propylene produced by a propane dehydrogenation device, the second end of the first pipeline is connected to the inlet end of the pressure stabilizing tank, the pressure reducing valve group is arranged on the first pipeline, and the outlet end of the pressure stabilizing tank is connected to an acrylic acid production device. In the acrylic acid production system of the present utility model, the gaseous propylene produced by the propane dehydrogenation device is directly transported to the boundary area of the acrylic acid device through the first pipeline. The gaseous propylene at the top of the propylene product tower of the propane dehydrogenation device does not need to be condensed. Then, the gaseous propylene is controlled and reduced to the required working pressure through the pressure reducing valve group, and then enters the pressure stabilizing tank. After being regulated by the pressure stabilizing tank, it directly enters the acrylic acid production device after being stabilized. Compared with the existing use of liquid-phase propylene in a storage tank, it saves the process of first condensing the propylene in the product tower of the propane dehydrogenation device into a liquid phase and then vaporizing the liquid-phase propylene into a gaseous propylene by the operation of a liquid-phase propylene vaporizer, saves the circulating water consumption, saves the power consumption of the liquid-phase propylene transfer pump, and reduces the use of equipment and equipment consumption, achieving the purpose of effective energy saving. Description of the Drawings
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0016] Figure 1 is a schematic structural diagram of the energy-saving acrylic production system of the present invention;
[0017] Figure 2 is a process flow diagram of the energy-saving acrylic production system of the present invention.
[0018] In the figure: 1. First pipeline; 11. Bypass pipeline; 2. Pressure reducing valve group; 21. First pressure reducing valve; 22. Second pressure reducing valve; 3. Pressure stabilizing tank; 4. Second pipeline; 5. Steam superheater; 6. Steam pipeline; 7. First control valve; 8. Second control valve; 9. Cut-off valve. Detailed implementation manners
[0019] In the description of the present invention, it should be noted that unless otherwise stated, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying, 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 to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0020] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.
[0021] The following will further elaborate on the detailed implementation manners of the present invention with reference to the drawings.
[0022] Embodiment 1:
[0023] An energy-saving acrylic production system provided in this embodiment, such as Figure 1 - Figure 2As shown in the figure, it includes a first pipeline 1, a pressure stabilizing tank 3, and a pressure reducing valve group 2. The first end of the first pipeline 1 is connected to the gaseous propylene produced by the propane dehydrogenation unit, and the second end of the first pipeline 1 is connected to the inlet end of the pressure stabilizing tank 3. The pressure reducing valve group 2 is arranged on the first pipeline 1, and the outlet end of the pressure stabilizing tank 3 is connected to the acrylic acid production unit. The pressure stabilizing tank 3 plays a role in stabilizing and buffering the pressure of the incoming gaseous propylene. The pressure reducing valve group 2 can keep the gaseous propylene introduced into the pressure stabilizing tank 3 within a certain pressure range to ensure its safety.
[0024] In the acrylic acid production system of this embodiment, the gaseous propylene produced by the propane dehydrogenation unit is directly transported to the boundary area of the acrylic acid unit through the first pipeline 1. The gaseous propylene at the top of the propylene product tower of the propane dehydrogenation unit does not need to be condensed. Then, the gaseous propylene is controlled and reduced in pressure to the required working pressure through the pressure reducing valve group 2, and then enters the pressure stabilizing tank 3. After being regulated by the pressure stabilizing tank 3, it directly enters the acrylic acid production unit after being stabilized. Compared with the existing method of using liquid-phase propylene in storage tanks, it saves the process of first condensing the propylene in the product tower of the propane dehydrogenation unit into liquid phase and then vaporizing the liquid-phase propylene into gaseous propylene by the operation of the liquid-phase propylene vaporizer. The saved circulating water consumption is about 2500 T / H, and the saved power consumption of the liquid-phase propylene transfer pump is about 20 KW.H. Moreover, it reduces the use of equipment and equipment consumption, achieving the purpose of effective energy conservation.
[0025] As a preferred embodiment, the pressure reducing valve group 2 includes a first pressure reducing valve 21 and a second pressure reducing valve 22. The first pressure reducing valve 21 is arranged on the first pipeline 1, and the second pressure reducing valve 22 is arranged in parallel with the first pressure reducing valve 21 through a bypass pipeline 11. Through the cooperation and regulation of the first pressure reducing valve 21 and the second pressure reducing valve 22, the pressure regulation is more accurate and flexible.
[0026] As a preferred embodiment, the energy-saving acrylic acid production system of this embodiment further includes a second pipeline 4 and a steam superheater 5. The first end of the second pipeline 4 is connected to the outlet end of the pressure stabilizing tank 3, and the second end of the second pipeline 4 is connected to the steam superheater 5. The gaseous propylene after being stabilized enters the steam superheater 5 through the second pipeline to be superheated, and then enters the downstream acrylic acid oxidation reactor to participate in the reaction to produce acrylic acid.
[0027] Specifically, the propylene gas inlet of the pressure stabilizing tank 3 is arranged on the bottom side wall of the pressure stabilizing tank 3, and the propylene gas outlet of the pressure stabilizing tank 3 is arranged at the top of the pressure stabilizing tank. It should be noted that the positions of the inlet and outlet can be adjusted according to process requirements.
[0028] As a preferred embodiment, a cut-off valve 9 is further arranged on the first pipeline 1, and the cut-off valve 9 is connected to the first pipeline 1 in front of the pressure reducing valve group 2. In case of an emergency, the cut-off valve 9 can be closed to ensure the safety of the propylene in the subsequent pressure stabilizing tank.
[0029] As a preferred embodiment, a pressure sensor is provided in the pressure stabilizing tank 3, and the pressure sensor, the pressure reducing valve group 2 and the cut-off valve 9 are all connected to the controller. The pressure sensor is used to detect the pressure in the pressure stabilizing tank 3. There can be multiple pressure sensors for sensing the pressures at different positions.
[0030] When the pressure sensor detects that the pressure of the propylene gas in the pressure stabilizing tank 3 is abnormal, the pressure reducing valve group 2 or the cut-off valve 9 can be regulated through the controller to keep the pressure of the propylene gas in the pressure stabilizing tank 3 within the normal range.
[0031] As a preferred embodiment, the steam superheater 5 is connected to the steam pipeline 6. The steam is used as the heat source and the propylene gas is used as the cold source. The propylene gas is indirectly heated by the steam, which has good safety. The steam and the gaseous propylene exchange heat in a countercurrent manner in the steam superheater, and the heat transfer efficiency is high.
[0032] As a preferred embodiment, a first control valve 7 is provided at the second end of the first pipeline 1, and the first control valve 7 is arranged at the inlet end of the pressure stabilizing tank. The first control valve 7 is used to regulate the flow rate of the propylene entering the pressure stabilizing tank. The first control valve 7 is connected to the controller. A second control valve 8 is provided at the first end of the second pipeline 4, and the second control valve 8 is arranged at the outlet end of the pressure stabilizing tank 3. The second control valve 8 is used to control the flow rate of the propylene gas flowing out of the pressure stabilizing tank. The second control valve 8 is connected to the controller for easy adjustment and control.
[0033] The above are only the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art of this technology can make several deformations and improvements without departing from the creative concept of the present invention, and all of them should be covered within the protection scope of the present invention.
Claims
1. An energy-saving acrylic acid production system, characterized in that: The invention comprises a first pipeline (1), a pressure stabilizing tank (3) and a pressure reducing valve group (2), wherein the first end of the first pipeline (1) is connected to gaseous propylene produced by a propane dehydrogenation device, the second end of the first pipeline (1) is connected to the inlet end of the pressure stabilizing tank (3), the pressure reducing valve group (2) is arranged on the first pipeline (1), and the outlet end of the pressure stabilizing tank (3) is connected to an acrylic acid production device.
2. The energy-saving acrylic acid production system according to claim 1, characterized in that: The pressure reducing valve group (2) comprises a first pressure reducing valve (21) and a second pressure reducing valve (22); the first pressure reducing valve (21) is arranged on the first pipeline (1); and the second pressure reducing valve (22) is arranged in parallel with the first pressure reducing valve (21) via a bypass pipeline.
3. The energy-saving acrylic acid production system according to claim 1, characterized in that: It also includes a second pipeline (4) and a steam superheater (5), wherein the first end of the second pipeline (4) is connected to the outlet end of the pressure-regulating tank (3), and the second end of the second pipeline (4) is connected to the steam superheater (5).
4. The energy-saving acrylic acid production system according to claim 1, characterized in that: A cut-off valve (9) is also provided on the first pipeline (1), and the cut-off valve (9) is connected to the first pipeline (1) at the front end of the pressure reducing valve group (2).
5. The energy-saving acrylic acid production system according to claim 4, characterized in that: A pressure sensor is provided in the pressure stabilizing tank (3), and the pressure sensor, the pressure reducing valve group (2) and the cut-off valve (9) are all connected to a controller.
6. The energy-saving acrylic acid production system according to claim 3, characterized in that: The steam superheater (5) is connected to a water vapor pipeline (6), and water vapor and gaseous propylene exchange heat in a countercurrent manner in the steam superheater.
7. The energy-saving acrylic acid production system according to claim 1, characterized in that: A first control valve (7) is arranged on the second end of the first pipeline (1), and the first control valve (7) is arranged at the inlet end of the pressure-surge tank (3).
8. The energy-saving acrylic acid production system according to claim 3, characterized in that: A second control valve (8) is arranged on the first end of the second pipeline (4), and the second control valve (8) is arranged at the outlet end of the pressure-surge tank (3).