Glycol multi-effect evaporator reboiling aldehyde removal equipment

Abstract

The utility model discloses reboiling aldehyde removal equipment of an ethylene glycol multi-effect evaporator, which belongs to the field of chemical production equipment and is characterized by comprising a first ethylene glycol concentration tower, a second ethylene glycol concentration tower and an ethylene glycol concentration tower reboiler matched with the first ethylene glycol concentration tower and the second ethylene glycol concentration tower, the first ethylene glycol concentration tower reboiler is communicated with the second ethylene glycol concentration tower through a pipeline, the third ethylene glycol concentration tower reboiler is communicated with the fourth ethylene glycol concentration tower reboiler through a pipeline, and the tower top of the carbon dioxide desorption tower is connected with a pipeline to a RTO combustion system. The vacuum ejector of the carbon dioxide desorption tower is communicated with the carbon dioxide desorption tower through a pipeline, a shunting pipeline is led out from the pipeline to the first ethylene glycol concentration tower reboiler and the second ethylene glycol concentration tower, and a gate valve is arranged on the shunting pipeline, so that the technical problems of formaldehyde discharge of the existing multi-effect evaporation reboiler and corrosion of a downstream pipeline are solved; the method is mainly applied to chemical production.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production equipment, and specifically relates to a reboiling and aldehyde removal device for an ethylene glycol multi-effect evaporator. Background Art

[0002] In the ethylene glycol unit, the aldehyde removal equipment of the multi-effect evaporator reboiler is a common equipment, which is used to ensure the long-term use of the reboiler, ensure the stable operation of the unit, reduce the corrosion of the downstream carbon steel pipeline, and ensure the impact of the generation of impurities on the downstream unit, reduce the safety risks of running, bubbling, dripping, and leakage in the pipeline of the ethylene glycol unit, and eliminate aldehydes and other impurities to reduce the generation of unknown substances in the downstream MEG refining system to ensure product quality. Therefore, the more aldehydes can be removed from the multi-effect evaporator reboiler continuously, the better the economic benefits of the ethylene glycol unit;

[0003] The aldehyde content and other impurities in the multi-effect evaporator reboiler are high. The accumulation of aldehyde content is brought into the MEG system, which requires the high cost of wastewater discharge and has a huge impact on the product quality of MEG and TEG.

[0004] Therefore, we adjusted the amount of clean steam used to reduce the formation of aldehyde content, but found that the corrosion of the reboiler and downstream pipelines was not alleviated.

[0005] Aiming at this phenomenon, this type of ethylene glycol unit multi-effect evaporator reboiler formaldehyde removal equipment solves the corrosion of the multi-effect evaporator reboiler and downstream pipelines and product quality problems. Summary of the invention

[0006] Purpose of the invention: The purpose of the utility model is to provide a reboiling and formaldehyde removal device for an ethylene glycol multiple-effect evaporator to solve the technical problems of formaldehyde removal and downstream pipeline corrosion in existing multiple-effect evaporator reboilers.

[0007] The above technical purpose of the utility model is achieved through the following technical solution: it is characterized by comprising:

[0008] A first ethylene glycol concentration tower, a second ethylene glycol concentration tower, and a first ethylene glycol concentration tower reboiler, a second ethylene glycol concentration tower reboiler, a third ethylene glycol concentration tower reboiler, and a fourth ethylene glycol concentration tower reboiler matched therewith;

[0009] The first ethylene glycol concentration tower reboiler connected to the first ethylene glycol concentration tower and the second ethylene glycol concentration tower reboiler are connected to heating steam from the first steam pipe network;

[0010] The third ethylene glycol concentration tower reboiler and the fourth ethylene glycol concentration tower reboiler connected to the second ethylene glycol concentration tower are connected to 1.8Mpag steam from the top of the first ethylene glycol concentration tower;

[0011] The bottom of the first ethylene glycol concentration tower is connected to the second ethylene glycol concentration tower through a first pipeline, and the condensate at the bottom of the first ethylene glycol concentration tower enters the second ethylene glycol concentration tower by pressure drop;

[0012] A pipeline leading to a first condensate pipe network is connected from the first ethylene glycol concentration tower reboiler, the second ethylene glycol concentration tower reboiler, the third ethylene glycol concentration tower reboiler and the fourth ethylene glycol concentration tower reboiler, and a first flow meter is arranged on the first condensate pipe network, wherein there are multiple first flow meters corresponding to each ethylene glycol concentration tower reboiler;

[0013] a carbon dioxide analysis tower vacuum ejector and a carbon dioxide analysis tower reboiler communicated with the carbon dioxide analysis tower;

[0014] A reflux pipeline is connected to the connecting pipeline of the carbon dioxide analysis tower vacuum ejector and the carbon dioxide analysis tower, and the first ethylene glycol concentration tower reboiler, the second ethylene glycol concentration tower reboiler, the third ethylene glycol concentration tower reboiler and the fourth ethylene glycol concentration tower reboiler are connected to the reflux pipeline;

[0015] The vacuum ejector of the carbon dioxide analysis tower receives steam from the second steam network and inputs it into the carbon dioxide analysis tower, and absorbs the aldehyde and impurity gases from the reboiler of the first ethylene glycol concentration tower, the reboiler of the second ethylene glycol concentration tower, the reboiler of the third ethylene glycol concentration tower and the reboiler of the fourth ethylene glycol concentration tower;

[0016] The reboiler of the carbon dioxide analysis tower is connected to the lower part of the carbon dioxide analysis tower. The steam entering the reboiler of the carbon dioxide analysis tower from the third steam pipeline network enters the carbon dioxide analysis tower after reboiled and partially vaporizes to heat the aldehydes and impurity gases in the carbon dioxide analysis tower and goes to the RTO combustion system from the top of the carbon dioxide analysis tower.

[0017] Furthermore: the first ethylene glycol concentration tower reboiler, the second ethylene glycol concentration tower reboiler, the third ethylene glycol concentration tower reboiler and the fourth ethylene glycol concentration tower reboiler are high-flux reboilers.

[0018] Furthermore: pressure gauges are installed on the first ethylene glycol concentration tower and the second ethylene glycol concentration tower, and a second flow control valve is installed on the first pipeline between the two.

[0019] Furthermore: a second flow meter and a third flow control valve are arranged on the third steam pipe network to control the steam entering the reboiler of the carbon dioxide analysis tower.

[0020] Compared with the prior art, the utility model has the following advantages: the outlet end of the vacuum ejector of the carbon dioxide analysis tower is connected with the carbon dioxide analysis tower, and in the process of the vacuum ejector of the carbon dioxide analysis tower conveying steam into the carbon dioxide analysis tower, aldehydes and other impurity gases generated by the first ethylene glycol concentration tower reboiler, the second ethylene glycol concentration tower reboiler, the third ethylene glycol concentration tower reboiler and the fourth ethylene glycol concentration tower reboiler are sucked in and mixed to be saturated and reduce the boiling point, and the high-temperature gas generated in the reboiler process is sent into the carbon dioxide analysis tower by the reboiler of the carbon dioxide analysis tower to exchange heat with the aldehyde-containing gas, thereby continuously bringing the aldehyde-containing gas and other impurities into the RTO combustion system, thereby ensuring long-term stable operation, and being suitable for comprehensive promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of the utility model. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] In the description of the invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the embodiment of the present utility model, Figure 1 As shown, a glycol multiple-effect evaporator reboiling formaldehyde removal equipment is characterized by comprising:

[0025] A first ethylene glycol concentration tower 1, a second ethylene glycol concentration tower 4, and a first ethylene glycol concentration tower reboiler 2, a second ethylene glycol concentration tower reboiler 3, a third ethylene glycol concentration tower reboiler 5, and a fourth ethylene glycol concentration tower reboiler 6 matched therewith;

[0026] The first ethylene glycol concentration tower reboiler 2 and the second ethylene glycol concentration tower reboiler 3 connected to the first ethylene glycol concentration tower 1 are connected to heating steam from the first steam pipe network 10;

[0027] The third ethylene glycol concentration tower reboiler 5 and the fourth ethylene glycol concentration tower reboiler 6 connected to the second ethylene glycol concentration tower 4 are connected to 1.8Mpag steam from the top of the first ethylene glycol concentration tower 1;

[0028] The bottom of the first ethylene glycol concentration tower 1 is connected to the second ethylene glycol concentration tower 4 through the first pipeline 12, and the condensate at the bottom of the first ethylene glycol concentration tower 1 enters the second ethylene glycol concentration tower 4 by pressure drop;

[0029] A pipeline leading to the first condensate pipe network 13 is connected from the first ethylene glycol concentration tower reboiler 2, the second ethylene glycol concentration tower reboiler 3, the third ethylene glycol concentration tower reboiler 5 and the fourth ethylene glycol concentration tower reboiler 6, and a first flow meter 14 is arranged on the first condensate pipe network 13. There are multiple first flow meters 14, and each of the first flow meters 14 corresponds to each ethylene glycol concentration tower reboiler;

[0030] A carbon dioxide analysis tower vacuum ejector 8 and a carbon dioxide analysis tower reboiler 9 communicated with the carbon dioxide analysis tower 7;

[0031] A reflux line 15 is connected to the connecting pipeline of the carbon dioxide analysis tower vacuum ejector 8 and the carbon dioxide analysis tower 7, and the first ethylene glycol concentration tower reboiler 2, the second ethylene glycol concentration tower reboiler 3, the third ethylene glycol concentration tower reboiler 5 and the fourth ethylene glycol concentration tower reboiler 6 are connected to the reflux line 15;

[0032] The carbon dioxide analysis tower vacuum ejector 8 receives steam from the second steam network 18 and inputs it into the carbon dioxide analysis tower 7, and absorbs the aldehyde and impurity gases from the first ethylene glycol concentration tower reboiler 2, the second ethylene glycol concentration tower reboiler 3, the third ethylene glycol concentration tower reboiler 5 and the fourth ethylene glycol concentration tower reboiler 6;

[0033] The carbon dioxide analysis tower reboiler 9 is connected to the lower part of the carbon dioxide analysis tower 7. The steam entering the carbon dioxide analysis tower reboiler 9 from the third steam pipe network 21 enters the carbon dioxide analysis tower 7 after reboiled and partially vaporized to heat the aldehydes and impurity gases in the carbon dioxide analysis tower 7 and then goes to the RTO combustion system 22 from the top of the carbon dioxide analysis tower 7.

[0034] The first ethylene glycol concentration tower reboiler 2, the second ethylene glycol concentration tower reboiler 3, the third ethylene glycol concentration tower reboiler 5 and the fourth ethylene glycol concentration tower reboiler 6 are high-flux reboilers;

[0035] A pressure gauge 11 is installed on the first ethylene glycol concentration tower 1 and the second ethylene glycol concentration tower 4, and a second flow control valve 28 is installed on the first pipeline between the two;

[0036] The third steam pipe network 21 is provided with a second flow meter 23 and a third flow control valve 24 to control the steam entering the reboiler 9 of the carbon dioxide decomposition tower.

[0037] The implementation method of the above scheme is as follows: the first ethylene glycol concentration tower 1, the second ethylene glycol concentration tower 4 and the first ethylene glycol concentration tower reboiler 2, the second ethylene glycol concentration tower reboiler 3, the third ethylene glycol concentration tower reboiler 5, the fourth ethylene glycol concentration tower reboiler 6, the carbon dioxide analysis tower 7, the carbon dioxide analysis tower vacuum ejector 8 and the carbon dioxide analysis tower reboiler 9 matching the first ethylene glycol concentration tower 1, the second ethylene glycol concentration tower reboiler 3, the third ethylene glycol concentration tower reboiler 5, the fourth ethylene glycol concentration tower reboiler 6, the carbon dioxide analysis tower 7, the carbon dioxide analysis tower vacuum ejector 8 and the carbon dioxide analysis tower reboiler 9 are operated in sequence;

[0038] The first ethylene glycol concentration tower reboiler 2 and the second ethylene glycol concentration tower reboiler 3 connected to the first ethylene glycol concentration tower 1 are connected to heating steam from the first steam pipe network 10;

[0039] The third ethylene glycol concentration tower reboiler 5 and the fourth ethylene glycol concentration tower reboiler 6 connected to the second ethylene glycol concentration tower 4 are connected to 1.8Mpag from the top of the first ethylene glycol concentration tower 1;

[0040] A pressure gauge 11 is installed on the first ethylene glycol concentration tower 1 and the second ethylene glycol concentration tower 4 to detect the internal pressure of the corresponding ethylene glycol concentration tower;

[0041] The bottom of the first ethylene glycol concentration tower 1 is connected to the second ethylene glycol concentration tower 4 through the first pipeline 12, and the condensate at the bottom of the first ethylene glycol concentration tower 1 enters the second ethylene glycol concentration tower 4 by pressure drop;

[0042] A pipeline leading to the first condensate pipe network 13 is connected from the first ethylene glycol concentration tower reboiler 2, the second ethylene glycol concentration tower reboiler 3, the third ethylene glycol concentration tower reboiler 5 and the fourth ethylene glycol concentration tower reboiler 6, and a first flow meter 14 is arranged on the first condensate pipe network 13. There are multiple first flow meters 14, and each of the first flow meters 14 corresponds to each ethylene glycol concentration tower reboiler;

[0043] A carbon dioxide analysis tower vacuum ejector 8 and a carbon dioxide analysis tower reboiler 9 communicated with the carbon dioxide analysis tower 7;

[0044] The reflux line 15 is connected to the connecting pipeline of the carbon dioxide analysis tower vacuum ejector 8 and the carbon dioxide analysis tower 7, and the first ethylene glycol concentration tower reboiler 2, the second ethylene glycol concentration tower reboiler 3, the third ethylene glycol concentration tower reboiler 5 and the fourth ethylene glycol concentration tower reboiler 6 are connected to the reflux line 15, and the connection points corresponding to the first ethylene glycol concentration tower reboiler 2, the second ethylene glycol concentration tower reboiler 3, the third ethylene glycol concentration tower reboiler 5 and the fourth ethylene glycol concentration tower reboiler 6 are divided into multiple The multi-stage pipeline 16 is provided with a gate valve 17 on each multi-stage pipeline. The vacuum ejector 8 of the carbon dioxide analysis tower receives steam from the second steam network 18 and in the process of inputting steam into the carbon dioxide analysis tower 7, the aldehyde-containing and impurity gas from the first ethylene glycol concentration tower reboiler 2, the second ethylene glycol concentration tower reboiler 3, the third ethylene glycol concentration tower reboiler 5 and the fourth ethylene glycol concentration tower reboiler 6 is sucked in, thereby increasing the gas saturation rate and reducing the boiling point. A thermometer 19 and a pressure gauge 20 are installed on the carbon dioxide analysis tower 7;

[0045] The carbon dioxide analysis tower reboiler 9 is connected to the lower part of the carbon dioxide analysis tower 7. The steam entering the carbon dioxide analysis tower reboiler 9 from the third steam pipe network 21 enters the carbon dioxide analysis tower 7 after reboiled and partially enters the carbon dioxide analysis tower 7 to heat the aldehydes and impurity gases in the carbon dioxide analysis tower 7 and goes to the RTO combustion system 22 from the top of the carbon dioxide analysis tower 7. The flow meter 23 and the third flow control valve 24 are arranged on the third steam pipe network 21 to control the steam entering the carbon dioxide analysis tower reboiler 9;

[0046] The carbon dioxide analysis tower kettle pump 25 is connected to the bottom of the carbon dioxide analysis tower 7 to suck the condensate accumulated at the bottom of the carbon dioxide and send it to the CO2 absorption tower.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. An ethylene glycol multiple-effect evaporator reboiling formaldehyde removal equipment, characterized in that: include: A first ethylene glycol concentration tower (1), a second ethylene glycol concentration tower (4), and a first ethylene glycol concentration tower reboiler (2), a second ethylene glycol concentration tower reboiler (3), a third ethylene glycol concentration tower reboiler (5), and a fourth ethylene glycol concentration tower reboiler (6) matched therewith; The first ethylene glycol concentration tower reboiler (2) and the second ethylene glycol concentration tower reboiler (3) connected to the first ethylene glycol concentration tower (1) are connected to heating steam from the first steam pipe network (10); The third ethylene glycol concentration tower reboiler (5) and the fourth ethylene glycol concentration tower reboiler (6) connected to the second ethylene glycol concentration tower (4) are connected to 1.8 Mpag steam from the top of the first ethylene glycol concentration tower (1); The bottom of the first ethylene glycol concentration tower (1) is connected to the second ethylene glycol concentration tower (4) through a first pipeline (12), and the condensate at the bottom of the first ethylene glycol concentration tower (1) enters the second ethylene glycol concentration tower (4) by pressure drop; Pipelines leading to the first condensate pipe network (13) are connected from the first ethylene glycol concentration tower reboiler (2), the second ethylene glycol concentration tower reboiler (3), the third ethylene glycol concentration tower reboiler (5) and the fourth ethylene glycol concentration tower reboiler (6), and a first flow meter (14) is arranged on the first condensate pipe network (13), wherein a plurality of first flow meters (14) are provided, and each first flow meter (14) corresponds to each ethylene glycol concentration tower reboiler; A carbon dioxide decomposition tower vacuum ejector (8) and a carbon dioxide decomposition tower reboiler (9) communicated with the carbon dioxide decomposition tower (7); A reflux pipeline (15) is connected to the connecting pipeline between the carbon dioxide decomposition tower vacuum ejector (8) and the carbon dioxide decomposition tower (7), and the first ethylene glycol concentration tower reboiler (2), the second ethylene glycol concentration tower reboiler (3), the third ethylene glycol concentration tower reboiler (5) and the fourth ethylene glycol concentration tower reboiler (6) are connected to the reflux pipeline (15); The carbon dioxide analysis tower vacuum ejector (8) receives steam from the second steam network (18) and inputs it into the carbon dioxide analysis tower (7), thereby sucking in aldehyde and impurity gases from the first ethylene glycol concentration tower reboiler (2), the second ethylene glycol concentration tower reboiler (3), the third ethylene glycol concentration tower reboiler (5) and the fourth ethylene glycol concentration tower reboiler (6); The carbon dioxide analysis tower reboiler (9) is connected to the lower part of the carbon dioxide analysis tower (7). The steam entering the carbon dioxide analysis tower reboiler (9) from the third steam pipe network (21) enters the carbon dioxide analysis tower reboiler (9) after reboiled, and the vaporized part enters the carbon dioxide analysis tower (7) to heat the aldehydes and impurity gases in the carbon dioxide analysis tower (7) and goes to the RTO combustion system (22) from the top of the carbon dioxide analysis tower (7).

2. The ethylene glycol multiple-effect evaporator reboiling and aldehyde removal equipment according to claim 1, characterized in that: The first ethylene glycol concentration tower reboiler (2), the second ethylene glycol concentration tower reboiler (3), the third ethylene glycol concentration tower reboiler (5) and the fourth ethylene glycol concentration tower reboiler (6) are high-throughput reboilers.

3. The ethylene glycol multiple-effect evaporator reboiling and aldehyde removal equipment according to claim 1, characterized in that: A pressure gauge (11) is installed on the first ethylene glycol concentration tower (1) and the second ethylene glycol concentration tower (4), and a second flow control valve (28) is installed on the first pipeline between the two.

4. The ethylene glycol multiple-effect evaporator reboiling and aldehyde removal equipment according to claim 1, characterized in that: A second flow meter (23) and a third flow control valve (24) are arranged on the third steam pipe network (21) to control the steam entering the reboiler (9) of the carbon dioxide decomposition tower.

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