Tail gas treatment system
Through the exhaust gas treatment system connecting the water washing tower and heat exchanger, high-temperature vinyl carbonate and low-temperature ethylene oxide washing are realized, solving the exhaust gas treatment problems caused by inappropriate temperature in the existing technology, ensuring the ethylene oxide Recycling and environmental protection.
Patent Information
- Application Number
- CN202420819750.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-19
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-19
AI Technical Summary
In the exhaust gas treatment of existing vinyl carbonate production devices, due to inappropriate temperature, the vinyl carbonate crystal blocking equipment or the absorption efficiency of ethylene oxide is low, and ethylene oxide cannot be effectively recovered and the environment is polluted.
Design a exhaust gas treatment system, through the connection of two water washing towers and heat exchangers, one stream of water is used to heat it to 50°C in the heat exchanger for high-temperature water washing vinyl carbonate, and the other stream of water is directly subjected to low-temperature water washing ring ethylene oxide is sent to the incineration system to achieve the recovery of ethylene oxide.
It effectively avoids the crystal blockage problem of vinyl carbonate, and improves the absorption efficiency of ethylene oxide, ensuring that ethylene oxide is recycled and avoids pollution of the environment.
Smart Images
Figure CN222286873U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ethylene carbonate (EC) production, in particular to a tail gas treatment system. Background Art
[0002] In the production process of ethylene carbonate (EC), tail gas containing ethylene oxide (EO) and a small amount of ethylene carbonate will be produced. In order to ensure green environmental protection and effectively recover ethylene oxide during the production process, the tail gas needs to be treated. Due to the physical and chemical properties of the materials ethylene carbonate and ethylene oxide, specifically, the melting point of ethylene carbonate is 38°C and it is soluble in water; ethylene oxide is a highly toxic carcinogen and is very prone to self-polymerization explosion. The explosion limit is 3-100% (v / v) and it is easily soluble in water. Therefore, the tail gas can be washed with water to recover a small amount of ethylene oxide to ensure that it does not leak, prevent it from polluting the environment, and endanger people's health.
[0003] However, in existing ethylene carbonate production equipment, tail gas treatment usually uses a water washing tower for water washing and absorption. Due to the special properties of ethylene oxide in ethylene carbonate, this results in: when the temperature is too low, ethylene carbonate is easy to crystallize in the equipment or pipeline, blocking the equipment and pipeline after a period of time; when the temperature is too high (45-50°C), it affects the absorption of ethylene oxide. Utility Model Content
[0004] In view of the defects of the prior art, the utility model provides a tail gas treatment system, which can wash ethylene carbonate with water at a higher temperature and wash ethylene oxide with water at a lower temperature. The gas after washing is sent to an incineration system, so that the ethylene oxide in the tail gas can be recovered to avoid environmental pollution.
[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is an exhaust gas treatment system, which includes a first water washing tower, a second water washing tower, a water washing medium pipeline, a heat exchanger, a first circulation pipeline, and a second circulation pipeline; the first water washing tower is connected to a tail gas feed pipeline, and the bottom of the first water washing tower is connected to an ethylene oxide device; the second water washing tower is connected to the top of the first water washing tower, the bottom of the second water washing tower is connected to the ethylene oxide device, and the top of the second water washing tower is connected to an exhaust gas incineration pipeline; the water washing medium pipeline is connected to the second water washing tower through the second water washing pipeline; the heat exchanger is connected to the water washing medium pipeline, and the heat exchanger is connected to the first water washing tower through the first water washing pipeline; one end of the first circulation pipeline is connected to the bottom of the first water washing tower, and the other end is connected to the first water washing pipeline; one end of the second circulation pipeline is connected to the bottom of the second water washing tower, and the other end is connected to the second water washing pipeline.
[0006] Furthermore, a first valve is arranged on the first circulation pipeline.
[0007] Furthermore, a second valve is provided on the second circulation pipeline.
[0008] Furthermore, the bottom of the first water washing tower is connected to the ethylene oxide device through a first EO-containing water delivery pump.
[0009] Furthermore, the bottom of the second water washing tower is connected to the ethylene oxide device through a second EO-containing water delivery pump.
[0010] Furthermore, the water washing medium pipeline includes a demineralized water pipeline.
[0011] Furthermore, the water washing medium pipeline includes a deionized water pipeline.
[0012] Furthermore, the water washing medium pipeline includes a deionized water pipeline and a deionized water pipeline.
[0013] The beneficial effects of the utility model are as follows: two water washing towers are connected in series, and a water washing medium is introduced, one of which is heated by a heat exchanger, and the other directly enters the water washing tower, so that ethylene carbonate can be washed at a higher temperature and ethylene oxide can be washed at a lower temperature. The gas after water washing is sent to the incineration system, so that the ethylene oxide in the tail gas can be recovered to avoid environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a process flow chart of a tail gas treatment system in one embodiment of the utility model;
[0015] In the figure:
[0016] 100, the first water washing tower, 110, the tail gas feed pipeline, 120, the first EO-containing water delivery pump,
[0017] 200, the second water washing tower, 210, the tail gas incineration pipeline, 220, the second EO-containing water delivery pump,
[0018] 300, water washing medium pipeline, 310, desalted water pipeline, 320, analytical water pipeline,
[0019] 400. Heat exchanger,
[0020] 500, first circulation pipeline, 510, first valve,
[0021] 600, second circulation pipeline, 610, second valve,
[0022] 700. Ethylene oxide plant,
[0023] 800, the second water washing pipeline,
[0024] 900. The first water washing pipeline. DETAILED DESCRIPTION
[0025] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0026] See also Figure 1 In one embodiment of the utility model, a tail gas treatment system includes a first water washing tower 100, a second water washing tower 200, a water washing medium pipeline 300, a heat exchanger 400, a first circulation pipeline 500, and a second circulation pipeline 600; the first water washing tower 100 is connected to a tail gas feed pipeline 110, and the bottom of the first water washing tower 100 is connected to an ethylene oxide device 700; the second water washing tower 200 is connected to the top of the first water washing tower 100, and the bottom of the second water washing tower 200 is connected to the ethylene oxide device 700, and the second water washing tower 200 is connected to the top of the first water washing tower 100. The top of the tower is connected to a tail gas incineration pipeline 210; the water washing medium pipeline 300 is connected to the second water washing tower 200 through the second water washing pipeline 800; the heat exchanger 400 is connected to the water washing medium pipeline 300, and the heat exchanger 400 is connected to the first water washing tower 100 through the first water washing pipeline 900; one end of the first circulation pipeline 500 is connected to the bottom of the first water washing tower 100, and the other end is connected to the first water washing pipeline 800; one end of the second circulation pipeline 600 is connected to the bottom of the second water washing tower 200, and the other end is connected to the second water washing pipeline 800.
[0027] The tail gas of the EC synthesis unit enters the first water washing tower 100 through the tail gas feed pipeline 110, and a small amount of ethylene carbonate and a small amount of ethylene oxide are washed away by the first water washing tower 100. The material then enters the second water washing tower 200 to absorb ethylene oxide. Finally, the tail gas after absorption is sent to incineration from the top of the second water washing tower 200 through the tail gas incineration pipeline 210. The deionized water or analytical water at 25°C is heated to 50°C by the heat exchanger 400 through the water washing medium pipeline 300 and then sent to the first water washing tower 100 through the first circulation pipeline 500 for circulation absorption and then sent to the ethylene oxide device 700. The deionized water or analytical water at 25°C is directly sent to the second water washing tower 200, and is sent to the ethylene oxide device 700 after circulation absorption through the second circulation pipeline 600. The operation cycle is carried out, and the ethylene carbonate and ethylene oxide are removed by water washing.
[0028] The tail gas treatment system is provided with a series of water washing towers and a heat exchanger 400, and the water washing medium entering the first water washing tower 100 is heated in a small range. The 25°C water washing medium is heated to 50°C by the water washing medium pipeline 300 through the heat exchanger 400 and then sent to the first water washing tower 100, which to a certain extent avoids the problem of too low temperature in the tail gas absorption of the production of ethylene carbonate, resulting in ethylene carbonate crystallization blocking the pipeline and equipment. The 25°C water washing medium is directly sent to the second water washing tower 200, which solves the problem of too high temperature in the tail gas absorption of the production of ethylene carbonate and low ethylene oxide absorption efficiency. The ethylene oxide in the tail gas of the production of ethylene carbonate is effectively recovered to avoid environmental pollution.
[0029] It should be noted that the above-mentioned tail gas treatment system is connected in series with two water washing towers, and desalted water and / or analytical water are introduced. One stream is heated by a heat exchanger 400, and the other stream directly enters the water washing tower. In this way, ethylene carbonate can be washed at a higher temperature and ethylene oxide can be washed at a lower temperature. The gas after washing is sent to the incineration system, so that the ethylene oxide in the tail gas can be recovered to avoid environmental pollution.
[0030] In one embodiment, a first valve 510 is disposed on the first circulation line 500 .
[0031] In one embodiment, a second valve 610 is disposed on the second circulation line 600 .
[0032] In one embodiment, the bottom of the first water washing tower 100 is connected to the ethylene oxide device 700 via a first EO-containing water sending pump 120 .
[0033] In one embodiment, the bottom of the second water washing tower 200 is connected to the ethylene oxide device 700 via a second EO-containing water sending pump 220 .
[0034] In one embodiment, the water wash medium pipeline 300 includes a deionized water pipeline 310 .
[0035] In one embodiment, the water wash medium pipeline 300 includes a deionized water pipeline 320 .
[0036] In one embodiment, the washing medium pipeline 300 includes a deionized water pipeline 310 and a deionized water pipeline 320 .
[0037] The above-mentioned tail gas treatment system is connected in series with two water washing towers, and desalted water and analytical water are introduced. One of the water washing towers is heated by a heat exchanger 400, and high-temperature water is used to wash ethylene carbonate, and low-temperature water is used to wash ethylene oxide. The gas after washing is sent to the incineration system, so that the ethylene oxide in the tail gas can be recovered to avoid environmental pollution.
[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0041] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.
Claims
1. A tail gas treatment system, characterized in that: include A first water washing tower, connected to a tail gas feed pipeline, wherein the bottom of the first water washing tower is connected to an ethylene oxide device; A second water washing tower is connected to the top of the first water washing tower, the bottom of the second water washing tower is connected to the ethylene oxide device, and the top of the second water washing tower is connected to a tail gas incineration pipeline; a water washing medium pipeline connected to the second water washing tower via a second water washing pipeline; a heat exchanger connected to the water washing medium pipeline, wherein the heat exchanger is connected to the first water washing tower through the first water washing pipeline; A first circulation pipeline, one end of which is connected to the bottom of the first water washing tower, and the other end of which is connected to the first water washing pipeline; A second circulation pipeline has one end connected to the bottom of the second water washing tower and the other end connected to the second water washing pipeline.
2. The exhaust gas treatment system according to claim 1, characterized in that: A first valve is arranged on the first circulation pipeline.
3. The exhaust gas treatment system according to claim 1, characterized in that: A second valve is arranged on the second circulation pipeline.
4. An exhaust gas treatment system according to any one of claims 1 to 3, characterized in that: The bottom of the first water washing tower is connected to the ethylene oxide device through a first EO-containing water delivery pump.
5. An exhaust gas treatment system according to any one of claims 1 to 3, characterized in that: The bottom of the second water washing tower is connected to the ethylene oxide device through a second EO-containing water delivery pump.
6. An exhaust gas treatment system according to any one of claims 1 to 3, characterized in that: The water washing medium pipeline includes a demineralized water pipeline.
7. An exhaust gas treatment system according to any one of claims 1 to 3, characterized in that: The water washing medium pipeline includes a deionized water pipeline.
8. An exhaust gas treatment system according to any one of claims 1 to 3, characterized in that: The water washing medium pipeline includes a deionized water pipeline and a deionized water pipeline.