Polyethylene liquid wax discharge system
By designing a polyethylene liquid wax emission system, the problems of excessive manual operations, large energy consumption and difficult sewage treatment in the polyethylene production process are solved, and efficient treatment and recycling of wax liquid is achieved, reducing production costs and environmental impacts.
Patent Information
- Application Number
- CN202421692582.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-07-17
AI Technical Summary
In the polyethylene production process, the treatment and emission of by-product waxes are subject to a large number of problems such as manual operation, high energy consumption, difficulty in sewage treatment, and many packaging consumables, resulting in difficulty in environmental maintenance and low wax recycling rate.
A polyethylene liquid wax discharge system is designed, including a wax treatment tank, feeding system, production water production device and pneumatic wax discharge valve. The wax liquid output is connected to the solid wax and liquid wax discharge pipelines by setting up a three-way connection to achieve direct heating and cooling of wax liquid, reducing energy waste, and transporting the wax liquid to the recycling tank truck through the liquid wax crane tube device.
It effectively solves the problems of energy waste, large amount of sewage treatment, large amount of manual operations and large packaging consumables during wax treatment, reduces production water consumption and sewage generation, reduces labor and packaging costs, and increases the comprehensive benefits of by-products.
Smart Images
Figure CN222836688U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of liquid wax discharge technology, and in particular to a polyethylene liquid wax discharge system. Background Technology
[0002] In the polyethylene production process, the polyethylene plant uses a low-pressure slurry process to produce high-density polyethylene. The process products include wax, a byproduct with a melting point of about 90°C. It is a white liquid at high temperatures and a white solid at room temperature.
[0003] In existing wax processing tanks, after the by-products are steamed at 100°C, production water is added to cool them down to 40-50°C, resulting in a white paste. The solidified wax is then discharged on-site. The discharged solidified wax needs to be packaged in specific ton bags and transported by forklift to the factory for sale.
[0004] Currently, the wax processing tank requires a large amount of manual operation to process liquid wax, and the production water and steam consumed are relatively large. When packaging the discharged solid wax, a large amount of packaging materials are required. The amount of wastewater generated by the cooling production water is large, making environmental maintenance difficult. Downstream customers still need to reheat the wax during processing, which increases the difficulty of wastewater treatment, wastes the wax recycling rate, and results in high manufacturing costs. Utility Model Content
[0005] This invention provides a polyethylene liquid wax discharge system, which solves the problem of processing and recycling wax, a byproduct generated in the current process of handling high-density polyethylene products. It also solves the problems of large amounts of packaging materials required when discharging solid wax, large amounts of wastewater generated from cooling and production water, and difficulties in environmental maintenance.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] A polyethylene liquid wax discharge system includes: a wax treatment tank, a feeding system, a production water device, and a pneumatic wax discharge valve; the wax treatment tank is equipped with a wax tank agitator and a wax liquid heating device; the input end of the wax treatment tank is connected to the feeding system through a feeding pipeline with a feeding valve; the top of the wax treatment tank is connected to the production water device through a water replenishment pipeline with a water replenishment valve.
[0008] The bottom of the wax treatment tank is connected to the top of the three-way connector via a pneumatic wax discharge valve; the bottom of the three-way connector is connected to the solid wax discharge pipeline and the liquid wax discharge pipeline via a first ball valve and a second ball valve, respectively; the liquid wax discharge pipeline is connected to the liquid wax loading arm.
[0009] Furthermore, there are at least two wax treatment tanks; the connecting pipelines and devices for the two wax treatment tanks are identical.
[0010] Furthermore, the pneumatic wax discharge valve is located at the bottom of the wax treatment tank; the wax treatment tank and the pneumatic wax discharge valve are connected by a flange.
[0011] Furthermore, the bottom side outlet of the tee connector is connected to the solid wax discharge pipeline via a first ball valve; the bottom vertical outlet of the tee connector is connected to the liquid wax discharge pipeline via a second ball valve; and each valve and pipeline is connected via a flange.
[0012] Furthermore, the liquid wax discharge pipelines of the two wax treatment tanks are connected to the liquid wax loading arm via a third ball valve; the output end of the liquid wax loading arm is connected to the tank truck; the liquid wax loading arm is equipped with a jacketed pipe steam tracing device, an electrostatic elimination device, and a foldable ladder.
[0013] Furthermore, the solid wax discharge pipeline is a low-pressure steam heating pipe wrapped with an insulated pipe; the diameter of the solid wax discharge pipeline is DN150; and the diameter of the liquid wax discharge pipeline is DN100.
[0014] Furthermore, the length of point A of the tee connector is 50mm; the angle of point B of the tee connector is 85°; and the tee connector is installed vertically.
[0015] The beneficial effects of this utility model are as follows:
[0016] This invention effectively solves the energy waste problem caused by the need for heating and then cooling during the discharge of polyethylene liquid wax. By setting a three-way connector, the wax output is connected to both solid wax discharge pipelines and liquid wax discharge pipelines. The raw materials in the wax treatment tank are heated and melted, and then directly discharged into the liquid wax loading arm via the liquid wax discharge pipeline and transported to the recovery tanker. This system significantly reduces the amount of production water used, reduces wastewater generation, and also reduces labor and packaging costs, effectively improving the overall benefits of by-products.
[0017] This invention, by simultaneously setting up solid wax and liquid wax production lines, allows for adjustment of the polyethylene wax production method based on the required state of the polyethylene wax liquid in the downstream production system. Attached Figure Description
[0018] To more clearly illustrate the embodiments of this utility model or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the overall design of this utility model.
[0020] Figure 2 This is a schematic diagram of point A of the three-way connector of this utility model.
[0021] Figure 3 This is a schematic diagram of point B of the three-way connector of this utility model.
[0022] Explanation of icon numbers:
[0023] 1. Wax processing tank; 2. Feeding system; 201. Feeding pipeline; 202. Feeding valve; 3. Production water device; 301. Water supply pipeline; 302. Water supply valve; 4. Pneumatic wax discharge valve; 5. Solid wax discharge pipeline; 501. First ball valve; 6. Liquid wax discharge pipeline; 601. Second ball valve; 602. Second ball valve; 7. T-connector; 8. Liquid wax loading arm device. Detailed Implementation
[0024] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0027] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.
[0028] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0029] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0030] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.
[0031] This utility model provides a technical solution: a polyethylene liquid wax discharge system, such as... Figure 1 As shown, it includes: a wax treatment tank 1, a feeding system 2, a production water device 3, and a pneumatic wax discharge valve 4; the wax treatment tank 1 is equipped with a wax tank agitator and a wax liquid heating device; the input end of the wax treatment tank 1 is connected to the feeding system 2 through a feeding pipeline 201 with a feeding valve 202; the top of the wax treatment tank 1 is connected to the production water device 3 through a water replenishment pipeline 301 with a water replenishment valve 302;
[0032] The bottom of the wax treatment tank 1 is connected to the top of the three-way connector 7 via a pneumatic wax discharge valve 4; the bottom of the three-way connector 7 is connected to the solid wax discharge pipeline 5 and the liquid wax discharge pipeline 6 via a first ball valve 501 and a second ball valve 601 respectively; the liquid wax discharge pipeline 6 is connected to the liquid wax loading arm device 8.
[0033] There are at least two wax treatment tanks 1; the production water device 3 is connected to the top water inlet of the two wax treatment tanks 1 respectively through a water supply pipeline 3 with a water supply valve 302; the connecting pipelines and devices of the two wax treatment tanks 1 are identical.
[0034] The pneumatic wax discharge valve 4 is located at the bottom of the wax treatment tank 1; the wax treatment tank 1 and the pneumatic wax discharge valve 4 are connected by a flange; the pneumatic wax discharge valve 4 is a valve that enables remote on / off control of wax discharge.
[0035] The bottom side outlet of the tee connector 7 is connected to the solid wax discharge pipeline 5 via the first ball valve 501; the bottom vertical outlet of the tee connector 7 is connected to the liquid wax discharge pipeline 6 via the second ball valve 601; all valves and pipelines are connected by flanges.
[0036] The diameter of the liquid wax discharge pipeline 6 is DN100; after the liquid wax discharge pipelines 6 of the two wax treatment tanks 1 are combined, they are transported to the tank truck through the liquid wax loading arm device 8. The pipeline design requires that the height of the material flow direction decreases accordingly and the slope is >3°.
[0037] The liquid wax discharge pipelines 6 of the two wax treatment tanks 1 are connected to the liquid wax loading arm device 8 through the third ball valve 602; the output end of the liquid wax loading arm device 8 is connected to the tank truck; the liquid wax loading arm device 8 is equipped with a jacketed pipe steam tracing device, an electrostatic elimination device and a foldable ladder; the liquid wax loading arm device 8 is installed at a height of 4 meters, with a site platform L103.20, and the loading arm can be installed after a suitable height modification.
[0038] The solid wax discharge pipeline 5 is a low-pressure steam heating pipe wrapped with an insulated pipe; the diameter of the solid wax discharge pipeline 5 is DN150; the solid wax discharge pipelines 6 of the two wax treatment tanks 1 are connected in parallel to the main wax discharge pipeline; the main wax discharge pipeline is designed with at least 10 wax discharge ports.
[0039] The length at point A of the tee connector 7 is 50mm; the angle at point B of the tee connector 7 is 85°. If the angle is too large, the pipeline will not have a slope; if the angle is too small, the pipeline cannot be connected. The tee connector 7 is installed vertically. The size of the tee connector 7 does not exceed 500*500mm for easy disassembly. If the size is too long, the pipe may be blocked when removing solid wax; if the size is too short, the bolts of the lower flange cannot be tightened due to the short distance.
[0040] The material delivered to wax treatment tank 1 by the feeding system is a high-temperature mother liquor. Hexane is flashed in the wax treatment tank and then enters the downstream heat exchanger for condensation and recovery. The wax in the mother liquor is collected in the wax treatment tank and dispersed by the wax tank agitator to prevent accumulation or solidification. The high-temperature mother liquor is a mixed solution of hexane and wax obtained by the feeding system.
[0041] The production water is used to cool the cooked wax. Its feed is located at the bottom of the wax processing tank 1 and is added via pipeline.
[0042] The implementation method of this utility model is as follows:
[0043] 1. When the polyethylene wax required by the lower production system is in liquid state, the high-temperature mother liquor is conveyed to the wax treatment tank through the feeding system. Hexane is flashed in the wax treatment tank, and steam is boiled to 100°C. The wax in the mother liquor is then collected in the wax treatment tank and dispersed by the wax tank agitator to prevent accumulation or solidification. Then, the pneumatic wax discharge valve is opened to discharge the wax liquid to the liquid wax discharge pipeline through the three-way connector. The third ball valve is opened to discharge the wax liquid to the liquid wax loading arm device, which then transports it to the tank truck and sends it to the lower production system.
[0044] 2. When the polyethylene wax required by the lower production system is in liquid or solid state, the high-temperature mother liquor is conveyed to the wax treatment tank through the feeding system. Hexane is flashed in the wax treatment tank, and steam is boiled to 100°C. The water supply valve is opened to input production water into the wax treatment tank through the water supply pipeline to cool the wax liquid to 40-50°C, which turns it into a white paste. Then, the pneumatic wax discharge valve is opened to discharge the paste wax liquid to the solid wax discharge pipeline through the three-way connector. The discharged paste wax liquid is then packaged and transported to the lower production system.
[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 inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A polyethylene liquid wax discharge system, characterized in that: include: A wax treatment tank (1), a feeding system (2), a water production device (3) and a pneumatic wax discharge valve (4); a wax tank agitator and a wax liquid heating device are provided inside the wax treatment tank (1); the input end of the wax treatment tank (1) is connected to the feeding system (2) via a feeding pipeline (201) with a feeding valve (202); the top of the wax treatment tank (1) is connected to the water production device (3) via a water supply pipeline (301) with a water supply valve (302); The bottom of the wax treatment tank (1) is connected to the top of a three-way connector (7) via a pneumatic wax discharge valve (4); the bottom of the three-way connector (7) is connected to a solid wax discharge pipeline (5) and a liquid wax discharge pipeline (6) via a first ball valve (501) and a second ball valve (601), respectively; the liquid wax discharge pipeline (6) is connected to a liquid wax crane device (8).
2. A polyethylene liquid wax discharge system according to claim 1, characterized in that: There are at least two wax processing tanks (1); the connecting pipelines and devices of the two wax processing tanks (1) are configured in the same manner.
3. A polyethylene liquid wax discharge system according to claim 1, characterized in that: The pneumatic wax discharge valve (4) is arranged at the bottom of the wax processing tank (1); the wax processing tank (1) and the pneumatic wax discharge valve (4) are connected via a flange.
4. A polyethylene liquid wax discharge system according to claim 1, characterized in that: The bottom side outlet of the three-way connector (7) is connected to the solid wax discharge pipeline (5) through a first ball valve (501); the bottom vertical outlet of the three-way connector (7) is connected to the liquid wax discharge pipeline (6) through a second ball valve (601); and each valve and pipeline are connected via a flange.
5. A polyethylene liquid wax discharge system according to claim 4, characterized in that: The liquid wax discharge pipelines (6) of the two wax processing tanks (1) are connected to the liquid wax crane device (8) via a third ball valve (602); the output end of the liquid wax crane device (8) is connected to a tank truck; the liquid wax crane device (8) is provided with a jacketed pipe steam heating device, a static electricity elimination device and a foldable escalator.
6. A polyethylene liquid wax discharge system according to claim 1, characterized in that: The solid wax discharge pipeline (5) is a low-pressure steam heating pipe with an insulation pipe wrapped on the outside; the diameter of the solid wax discharge pipeline (5) is DN150; the diameter of the liquid wax discharge pipeline (6) is DN100.
7. A polyethylene liquid wax discharge system according to claim 1, characterized in that: The length of the three-way connector (7) at point A is 50 mm; the angle of the three-way connector (7) at point B is 85°; and the three-way connector (7) is installed vertically.