EO (ethylene oxide) production capacity adjusting equipment of ethylene oxide device

Abstract

The utility model discloses EO (ethylene oxide) production capacity adjusting equipment of an ethylene oxide device, which belongs to the technical field of chemical production and comprises an EO refining tower, a high-efficiency tray I, a high-efficiency tray II and a high-efficiency tray III are arranged in the EO refining tower, a thermometer a is arranged on the EO refining tower, the upper part of the EO refining tower is connected with a condenser a through a pipeline, the condenser a is connected with a condenser b through a pipeline, and the condenser b is connected with a condenser. A flow meter c and a flow control valve c are respectively arranged on a feeding connecting pipeline at the left part of the EO refining tower, a gate valve is arranged on a DMW pipeline at the left part of the EO refining tower, one side of the EO refining tower is connected with a delivery pump through a pipeline, the delivery pump is connected with a cooler c through a pipeline, and the cooler c is connected with an analyzer through a pipeline. And the bottom of the EO refining tower is communicated with a delivery pump through a pipeline. The method is mainly applied to chemical production.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, specifically to an EO capacity adjustment device for an ethylene oxide plant. Background Technology

[0002] In ethylene oxide plants, expanding the capacity of the EO refining tower is a key equipment issue in ethylene oxide production. It is used to ensure the stable operation of the EO refining tower, guaranteeing a stable and continuous output of qualified products under high load for extended periods. Expanding the EO refining tower's capacity can maximize the balance of the plant's energy consumption, increase the annual output of EO products, reduce losses in unit material consumption, and flexibly adjust the EO and EG loads in the ethylene oxide plant. Therefore, the longer the EO refining tower operates continuously at high load, the better the economic benefits for the ethylene oxide plant.

[0003] In existing technologies, the EO and EG production of ethylene oxide plants undergoes significant seasonal adjustments. During winter, the EG load is often much higher than the EO load, while at other times, the EO load is much higher than the EG load. Furthermore, when the EO load is higher than the EG load, the energy consumption of the ethylene oxide plant is found to be much lower than when the EG load is higher than the EO load. However, existing technologies cannot meet the actual supply of EO under high market demand, nor can they flexibly adjust the EO and EG loads in the ethylene oxide plant. To address this issue, this invention provides an EO capacity adjustment device for ethylene oxide plants, enabling more flexible adjustment of EO and EG demand in the ethylene oxide plant and dynamically meeting market needs. Utility Model Content

[0004] To address the technical problems mentioned in the background section, this utility model provides an EO production capacity regulation device for an ethylene oxide plant, employing the following technical solution:

[0005] An EO production capacity regulation device for an ethylene oxide plant, comprising an EO purification tower, characterized in that,

[0006] The EO refining column is equipped with three high-efficiency trays: tray one, tray two, and tray three. A thermometer (a) is installed on the EO refining column. A condenser (a) is connected to the upper part of the EO refining column via a pipeline. Condenser (a) is connected to condenser (b) via a pipeline. Condenser (b) is connected to a reflux tank via a pipeline. The bottom of the reflux tank is connected to the EO refining column via a pipeline equipped with a flow meter (a), a flow control valve (a), and a column bottom pump. A branch pipeline is installed on the bottom of the reflux tank, and a flow meter (b) and a flow control valve (b) are installed on the branch pipeline.

[0007] A reboiler is connected to one side of the EO purification column via a pipeline. A flow meter d and a flow control valve c are installed on the reboiler route. A differential pressure control valve is installed on the reboiler branch. The bottom of the reboiler is connected to the bottom of the EO purification column via a pipeline.

[0008] A flow meter (c) and a flow control valve (d) are respectively installed on the feed connection line on the left side of the EO refining tower; a gate valve is installed on the DMW line on the left side of the EO refining tower.

[0009] An external pump is connected to one side of the EO refining tower via a pipeline. The external pump is connected to a cooler c via a pipeline. The cooler c is connected to an online analyzer via a pipeline.

[0010] The bottom of the EO refining tower is connected to the delivery pump via a pipeline.

[0011] Preferably, pressure gauge a, pressure gauge b and differential pressure gauge c are provided between the external pump and the EO refining tower, and thermometer b is provided on the pipeline between the condenser b and the reflux tank.

[0012] The working principle of this utility model is as follows: After the EO refining tower is fed from the light component removal tower, the gaseous ethylene oxide is first pre-cooled by condenser a, and then further cooled and condensed into liquid by condenser b. It then enters the reflux tank for storage and is then pumped back into the EO refining tower through the tower bottom pump. Part of it passes through the branch line to remove formaldehyde impurities from the product. When the feed flow rate increases or the reflux ratio decreases to the design value, the product will be unqualified. To address this, we change the distribution of the tower trays below the chimney tray of the EO refining tower and transform the tower trays above the chimney tray into high-efficiency tower trays to achieve the capacity expansion effect.

[0013] This utility model has the following advantages: By modifying the trays of the EO refining tower, this utility model enhances the flexibility of EO and EG load adjustment and market demand while ensuring product quality, and greatly reduces the energy consumption of the equipment and improves the economic efficiency of the equipment. Attached Figure Description

[0014] Figure 1 This is a flowchart illustrating the process of this utility model. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1

[0017] Please refer to Figure 1 ,

[0018] An EO production capacity regulation device for an ethylene oxide plant, comprising an EO purification tower 10, characterized in that,

[0019] The EO refining column 10 is equipped with three high-efficiency trays: 11-a (first high-efficiency tray 11-b) and 11-c (third high-efficiency tray 11-c). A thermometer a4 is installed on the EO refining column 10. A condenser a21 is connected to the upper part of the EO refining column 10 via a pipeline. Condenser a21 is connected to condenser b22 via a pipeline. Condenser b22 is connected to a reflux tank 24 via a pipeline. The bottom of the reflux tank 24 is connected to the EO refining column 10 via a pipeline equipped with a flow meter a19, a flow control valve a20, and a column bottom pump 25. A branch pipeline is installed on the bottom of the reflux tank 24, and a flow meter b26 and a flow control valve b27 are installed on the branch pipeline.

[0020] One side of the EO refining tower 10 is connected to a reboiler 9 via a pipeline. A flow meter d6 and a flow control valve c7 are installed on the reboiler 9 line. A differential pressure control valve 8 is installed on a branch of the reboiler 9. The bottom of the reboiler 9 is connected to the bottom of the EO refining tower 10 via a pipeline. A flow meter c2 and a flow control valve d3 are installed on the feed connection pipeline on the left side of the EO refining tower 10. A gate valve 1 is installed on the DMW pipeline on the left side of the EO refining tower 10.

[0021] One side of the EO refining tower 10 is connected to an external pump 15 via a pipeline. The external pump 15 is connected to a cooler c16 via a pipeline. The cooler c16 is connected to a line analyzer 18 via a pipeline. The bottom of the EO refining tower 10 is connected to a delivery pump 17 via a pipeline.

[0022] Pressure gauges a12, b13 and c14 are installed between the external pump 15 and the EO refining tower 10, and thermometer b23 is installed on the pipeline between the condenser b22 and the reflux tank 24.

[0023] The working principle of this utility model is as follows:

[0024] The flow rate of the light component is controlled by flow meter c2 and flow control valve d3. Demineralized water, as an aldehyde removal aid for ethylene oxide, enters the EO refining tower 10 through a pipeline. The pipeline is equipped with gate valve 1, where DMW refers to demineralized water. When the online analyzer 18 changes, the amount added by gate valve 1 can be adjusted to control the impurity content in the EO product and ensure product quality.

[0025] One side of the EO refining tower 10 is connected to a reboiler 9 via a pipeline. The reboiler 9 has a parallel route equipped with a flow meter d6, a flow control valve c7, and a pressure control valve 8. The bottom of the reboiler 9 is connected to the bottom of the EO refining tower 10 via a pipeline. An overflow plate is installed at the bottom of the EO refining tower 10, and an inclined plate is installed above the overflow plate. Waste liquid in the EO refining tower 10 falls onto the inclined plate and flows laterally to the space to the right of the overflow plate. Impurities in the waste liquid settle in the space to the right of the overflow plate, while the clean ethylene oxide solution in the waste liquid flows over the left side of the overflow plate and into the space to the left of the overflow plate. Then, it enters the reboiler 9 of the EO refining tower through the pipeline for reboiling and heating before being sent back to the EO refining tower 10 to produce more ethylene oxide. The flow rate of ethylene oxide in the pipeline is controlled by the flow meter b6, the flow control valve c7, and the pressure control valve 8.

[0026] The bottom of the EO refining tower 10 is connected to a transfer pump 17 via a pipeline. The impurities that settle in the space to the right of the overflow plate inside the EO refining tower 10 are transported to the EG section, which is the ethylene glycol section, via the transfer pump 17.

[0027] Reboiler 9 provides a heat source to the EO refining column 10. In the EO refining column 10, the flow control valve C3 controls the flow of an EO aqueous solution exceeding the original design quantity into high-efficiency trays 11-a and 11-b for mass and heat transfer separation. The gaseous state contacts the liquid state from bottom to top, and vice versa, ensuring that the content in each tray meets the required standard. The gaseous ethylene oxide separated from the high-efficiency trays enters the condenser a21 through a pipeline. 1. After pre-cooling, the EO enters the condenser b22 through a pipeline. After further cooling and condensation in the condenser b22, it enters the reflux tank 24 through a pipeline for storage. A portion of the EO is sent back to the high-efficiency tray for further separation by the bottom pump 25. After qualified separation, it is connected to the high-efficiency tray 31-c. The qualified liquid ethylene oxide in the high-efficiency tray 31-c is connected to the external pump 15 by gravity through a pipeline. The external pump 15 is connected to the cooler c16 through a pipeline to deliver the EO to the EO spherical tank.

[0028] This utility model is simple to operate, convenient to use, and suitable for widespread promotion and application. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An ethylene oxide plant EO production capacity adjustment apparatus comprising an EO finishing column (10), characterized in that , The EO refining tower (10) is provided with high-efficiency tray one (11-a), high-efficiency tray two (11-b) and high-efficiency tray three (11-c), the EO refining tower (10) is provided with thermometer a (4), the upper part of the EO refining tower (10) is connected with condenser a (21) through a pipeline, the condenser a (21) is connected with condenser b (22) through a pipeline, the condenser b (22) is connected with reflux tank (24) through a pipeline, the bottom of the reflux tank (24) is connected with the EO refining tower (10) through a pipeline, and the pipeline is provided with flowmeter a (19), flow control valve a (20) and tower kettle pump (25), the bottom pipeline of the reflux tank (24) is provided with a branch pipeline, and the branch pipeline is provided with flowmeter b (26) and flow control valve b (27); The left part of the EO refining tower (10) is connected with reboiler (9) through a pipeline, the reboiler (9) is provided with flowmeter d (6) and flow control valve c (7) on the route, and the reboiler (9) is provided with pressure difference control valve (8) on the branch, and the bottom of the reboiler (9) is connected with the bottom of the EO refining tower (10) through a pipeline; The left part of the EO refining tower (10) is connected with reboiler (9) through a pipeline, the reboiler (9) is provided with flowmeter d (6) and flow control valve c (7) on the route, and the reboiler (9) is provided with pressure difference control valve (8) on the branch, and the bottom of the reboiler (9) is connected with the bottom of the EO refining tower (10) through a pipeline; The left part of the EO refining tower (10) is connected with reboiler (9) through a pipeline, the reboiler (9) is provided with flowmeter d (6) and flow control valve c (7) on the route, and the reboiler (9) is provided with pressure difference control valve (8) on the branch, and the bottom of the reboiler (9) is connected with the bottom of the EO refining tower (10) through a pipeline; The bottom of the EO refining tower (10) is connected with the conveying pump (17) through a pipeline.

2. An ethylene oxide plant EO production capacity adjustment apparatus according to claim 1, characterized in that The pipeline between the condenser b (22) and the reflux tank (24) is provided with thermometer b (23).

3. An ethylene oxide plant EO production capacity adjustment apparatus as claimed in claim 1, characterized in that ​

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