Stripping tower system for improving methanol yield

Abstract

The utility model belongs to the technical field of coal methanol tail gas treatment, and relates to a stripping tower system for improving methanol yield, which comprises a fusel oil conveying pipeline and a desalted water conveying pipeline, the inlet end of the fusel oil conveying pipeline is communicated with the atmospheric tower, and the outlet end of the fusel oil conveying pipeline is communicated with the stripping tower; the desalted water conveying pipeline is communicated with the fusel oil conveying pipeline; according to the utility model, desalted water is directly injected into the fusel oil conveying pipeline through the desalted water conveying pipeline, the fusel oil is diluted before entering the stripping tower, and high-proportion difficult-to-volatilize substances in the fusel oil are diluted, so that fluid in the stripping tower flows according to an expected path; the problem that an internal circulation state which is not beneficial to methanol recovery is formed in the stripping tower due to the fact that the concentration of fusel oil is too high is avoided, and then the problem that the stripping tower is unstable in operation in the internal circulation state is avoided, so that the stripping tower keeps normal operation, methanol in the fusel oil is effectively separated, and the methanol yield of the rectification device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field that the stripping tower optimization in methanol rectification process, specifically related to a stripping tower system that improves methanol yield. BACKGROUND

[0002] Methanol rectification device generally adopts 3+1 tower flow, this flow is constituted by pre rectification tower, pressurized rectification tower, atmospheric rectification tower core rectification system, plus a stripping tower for further processing. Atmospheric rectification stage, the fusel oil is collected to atmospheric tower side, and the fusel oil is sent into the stripping tower subsequently, and the methanol in the fusel oil is further recovered in the stripping tower, so as to improve the methanol yield of rectification device.

[0003] The structure of the stripping tower in the prior art has certain research, see the patent literature with the application number 202421910411.X, a coke oven gas methanol wastewater stripping process system is disclosed, including coke oven conversion system and methanol rectification system, the coke oven conversion system includes: conversion furnace, circulating water heat exchanger and waste heat boiler, the methanol rectification system includes: atmospheric tower and the component related to wastewater treatment. The gas produced by the conversion furnace is supplied to the need of methanol synthesis, and the fusel oil discharged from the atmospheric tower is first sent into the wastewater tank, then preheated by the wastewater heat exchanger and sent into the stripping tower, and the wastewater returned at the bottom of the stripping tower is further treated by the circulating water heat exchanger.

[0004] However, the fusel oil collected from the atmospheric tower side contains a high proportion of difficult-to-volatile substances in the fusel oil component, which continuously accumulates in the stripping tower after entering the stripping tower, so that the fluid in the tower circulates in this part of the area, which causes the formation of an internal circulation state in the stripping tower, which is not conducive to the recovery of methanol. Under the internal circulation state, the stripping tower cannot operate normally, and thus cannot effectively separate the methanol in the fusel oil, the methanol loss in the fusel oil increases, and the methanol yield of the rectification device decreases. UTILITY MODEL CONTENT

[0005] In order to solve the technical problem that the high proportion of difficult-to-volatile substances in the fusel oil component continuously accumulates in the stripping tower, which causes the formation of an internal circulation state in the stripping tower, which is not conducive to the recovery of methanol, the utility model provides a stripping tower system for improving the methanol yield.

[0006] The utility model discloses a stripping column system of improving methanol recovery rate, through introducing desalted water delivery pipeline, dilutes fusel oil in advance to the fusel oil into the stripping column, dilutes high proportion difficult volatile substance in fusel oil, makes the fluid in the stripping column flow according to the expected path, avoids the internal circulation state of the stripping column that is not conducive to methanol recovery caused by the fusel oil concentration being too high, and then avoids the problem of unstable operation or frequent accidents of the stripping column under the internal circulation state, makes the stripping column keep normal operation, thereby effectively separates the methanol in fusel oil, improves the methanol recovery rate of rectifying device.

[0007] To solve the above technical problems, the utility model provides the following technical scheme:

[0008] A stripping column system of improving methanol recovery rate, including: fusel oil delivery pipeline and desalted water delivery pipeline, the inlet end of fusel oil delivery pipeline communicates with atmospheric column, the outlet end of fusel oil delivery pipeline communicates with stripping column, and fusel oil delivery pipeline is used to deliver the fusel oil collected from atmospheric column to stripping column, desalted water delivery pipeline communicates with fusel oil delivery pipeline, and desalted water delivery pipeline is used to provide desalted water to fusel oil delivery pipeline.

[0009] In a specific embodiment, the stripping column system of improving methanol recovery rate further includes a desalted water flow regulating assembly, and the desalted water flow regulating assembly includes a first regulating valve; the first regulating valve is installed on the desalted water delivery pipeline.

[0010] In a specific embodiment, the desalted water flow regulating assembly further includes a first low point drain valve; the first low point drain valve is installed on the desalted water delivery pipeline, and the first low point drain valve is located between the first regulating valve and the fusel oil delivery pipeline.

[0011] In a specific embodiment, the desalted water flow regulating assembly further includes a second regulating valve; the second regulating valve is installed on the desalted water delivery pipeline, and the second regulating valve is located between the first low point drain valve and the fusel oil delivery pipeline.

[0012] In a specific embodiment, the desalted water flow regulating assembly further includes a blind flange valve; the blind flange valve is installed on the desalted water delivery pipeline, and the blind flange valve is located between the first low point drain valve and the second regulating valve.

[0013] In a specific embodiment, the desalted water flow regulating assembly further includes a third regulating valve; the third regulating valve is installed on the desalted water delivery pipeline, and the third regulating valve is located between the first regulating valve and the inlet end of the desalted water delivery pipeline.

[0014] In one specific implementation, the methanol yield improvement stripping column system further comprises a main regulating assembly and a secondary regulating assembly for regulating the fusel oil flow; the main water outlet regulating assembly and the secondary water outlet regulating assembly are arranged side by side on the fusel oil conveying pipeline.

[0015] In one specific implementation, the main regulating assembly comprises a fourth regulating valve; the fourth regulating valve is installed on the fusel oil conveying pipeline; the secondary water outlet regulating assembly has the same structure as the main water outlet regulating assembly.

[0016] In one specific implementation, the main water outlet regulating assembly further comprises a self-regulating valve; the self-regulating valve is installed on the fusel oil conveying pipeline, and the self-regulating valve is located between the fourth regulating valve and the outlet end of the fusel oil conveying pipeline.

[0017] In one specific implementation, the main water outlet regulating assembly further comprises a fifth regulating valve; the fifth regulating valve is installed on the fusel oil conveying pipeline, and the fifth regulating valve is located between the self-regulating valve and the outlet end of the fusel oil conveying pipeline.

[0018] In summary, the present application has the following beneficial technical effects:

[0019] 1. The methanol yield improvement stripping column system of the present application introduces a desalinated water conveying pipeline to directly inject desalinated water into the fusel oil conveying pipeline, dilutes the fusel oil before it enters the stripping column, dilutes the high proportion of difficult volatile substances in the fusel oil, makes the fluid in the stripping column flow along the expected path, avoids the formation of an internal circulation state in the stripping column that is not conducive to methanol recovery due to the excessively high concentration of fusel oil, thereby avoiding the problem of unstable operation or frequent accidents of the stripping column in the internal circulation state, making the stripping column maintain normal operation, effectively separating the methanol in the fusel oil, and improving the methanol yield of the rectification device.

[0020] 2. The methanol yield improvement stripping column system of the present application sets the desalinated water flow regulating assembly, the main regulating assembly, and the secondary regulating assembly to cooperate with each other, accurately regulate the desalinated water flow and the fusel oil flow, and more accurately dilute the concentration of the fusel oil with the desalinated water, thereby avoiding the formation of an environment in the stripping column that is not conducive to methanol recovery due to excessive desalinated water, and improving the reliability of the stripping column system. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the methanol yield improvement stripping column system of the present application.

[0022] Explanation of reference signs: 1, fusel oil conveying pipeline; 2, desalted water conveying pipeline; 3, first regulating valve; 4, first low point discharge valve; 5, second regulating valve; 6, blind plate valve; 7, third regulating valve; 8, fourth regulating valve; 9, self-regulating valve; 10, fifth regulating valve; 11, second low point discharge valve; 12, stripping tower. DETAILED DESCRIPTION

[0023] The technical scheme of the utility model will be further explained and described below in combination with the drawings and embodiments, but the utility model is not limited to the following described embodiments.

[0024] The methanol rectification device generally adopts a 3+1 tower process, which is composed of a pre-distillation tower, a pressurized rectification tower and an atmospheric pressure rectillation tower as a core rectification system, and additionally has a stripping tower 12 for further recovering methanol. In the atmospheric pressure rectification stage, fusel oil is collected from the side of the atmospheric pressure tower, and then sent to the stripping tower 12 for further recovering methanol in the fusel oil, so as to improve the methanol yield of the rectification device. However, the fusel oil collected from the side of the atmospheric pressure tower contains a high proportion of substances difficult to volatilize in the fusel oil components, which causes an internal circulation state in the stripping tower 12 after entering the stripping tower 12, i.e. an internal circulation state. In the internal circulation state, the stripping tower 12 cannot operate normally, cannot effectively separate the methanol in the fusel oil, the methanol loss in the fusel oil increases, and the methanol yield of the rectification device decreases. The utility model provides a stripping tower system for improving the methanol yield, which aims to dilute the concentration of the fusel oil, avoid the formation of the internal circulation state in the stripping tower 12, and then make the stripping tower 12 effectively separate the methanol in the fusel oil, reduce the methanol loss in the fusel oil, and improve the methanol yield of the rectification device.

[0025] Reference Figure 1 A stripping tower system for improving the methanol yield, comprising: a fusel oil conveying pipeline 1 and a desalted water conveying pipeline 2. The inlet end of the fusel oil conveying pipeline 1 is communicated with the atmospheric pressure tower, the outlet end of the fusel oil conveying pipeline 1 is communicated with the stripping tower 12, and the fusel oil conveying pipeline 1 is used for conveying the fusel oil collected from the atmospheric pressure tower into the stripping tower 12; the desalted water conveying pipeline 2 is communicated with the fusel oil conveying pipeline 1, and the desalted water conveying pipeline 2 is used for providing desalted water into the fusel oil conveying pipeline 1.

[0026] Reference Figure 1 The stripping tower system for improving the methanol yield further comprises a desalted water flow regulating assembly, and the desalted water flow regulating assembly comprises a first regulating valve 3.

[0027] Embodiment 1:

[0028] Reference Figure 1The methanol yield improving stripping tower system of the embodiment further comprises a first low point discharge valve 4. The first low point discharge valve 4 is installed on the desalted water conveying pipeline 2 and is located between the first regulating valve 3 and the fusel oil conveying pipeline 1.

[0029] When the stripping tower system is in normal operation, the valve of the first low point discharge valve 4 is in a closed state to prevent the desalted water in the desalted water conveying pipeline 2 from leaking; when too much desalted water accumulates in the desalted water conveying pipeline 2, the valve of the desalted water conveying pipeline 2 is opened to discharge the excess desalted water in the desalted water conveying pipeline 2.

[0030] In the embodiment, the first low point discharge valve 4 is arranged to facilitate timely discharge of excess desalted water in the desalted water conveying pipeline 2, prevent the accumulated desalted water from blocking the desalted water conveying pipeline 2, and ensure that the desalted water can flow smoothly into the fusel oil conveying pipeline 1 to dilute the concentration of the fusel oil.

[0031] Embodiment 2

[0032] With reference to Figure 1 The methanol yield improving stripping tower system of the embodiment further comprises a second regulating valve 5 on the basis of Embodiment 1. The second regulating valve 5 is installed on the desalted water conveying pipeline 2 and is located between the first low point discharge valve 4 and the fusel oil conveying pipeline 1.

[0033] In the embodiment, the second regulating valve 5 is arranged to further regulate the flow of desalted water in the desalted water conveying pipeline 2, so that the desalted water can more accurately dilute the concentration of the fusel oil and avoid too much desalted water from forming an environment inside the stripping tower that is not conducive to the recovery of methanol.

[0034] Embodiment 3

[0035] With reference to Figure 1 The methanol yield improving stripping tower system of the embodiment further comprises a blind valve 6 on the basis of Embodiment 2. The blind valve 6 is installed on the desalted water conveying pipeline 2 and is located between the first low point discharge valve 4 and the second regulating valve 5.

[0036] In the embodiment, the blind valve 6 is arranged to completely cut off the flow of desalted water in the desalted water conveying pipeline 2 when necessary, facilitating maintenance and repair of other components by operating personnel.

[0037] Embodiment 4

[0038] With reference to Figure 1The methanol yield stripping tower system of the embodiment improves the methanol yield. On the basis of embodiment 3, the desalted water flow adjusting assembly further comprises a third adjusting valve 7. The third adjusting valve 7 is installed on the desalted water conveying pipeline 2, and the third adjusting valve 7 is located between the first adjusting valve 3 and the inlet end of the desalted water conveying pipeline 2.

[0039] In the embodiment, the third adjusting valve 7 is arranged to facilitate adjusting the total flow of the desalted water at the inlet end of the desalted water conveying pipeline 2, and then accurately adjusting the amount of the desalted water entering the fusel oil conveying pipeline 1.

[0040] Embodiment 5

[0041] Referring to Figure 1 The methanol yield stripping tower system of the embodiment improves the methanol yield. On the basis of embodiment 4, the methanol yield stripping tower system further comprises a main adjusting assembly and a secondary adjusting assembly for adjusting the flow of the fusel oil; and the main water outlet adjusting assembly and the secondary water outlet adjusting assembly are arranged side by side on the fusel oil conveying pipeline 1.

[0042] In the embodiment, the secondary water outlet adjusting assembly is arranged to be used with the main water outlet adjusting assembly, so as to ensure that the fusel oil can be normally conveyed into the stripping tower 12 when the main water outlet adjusting assembly fails, and the reliability and stability of the stripping tower system are improved.

[0043] Embodiment 6

[0044] Referring to Figure 1 The methanol yield stripping tower system of the embodiment improves the methanol yield. On the basis of embodiment 5, the main adjusting assembly comprises a fourth adjusting valve 8. The fourth adjusting valve 8 is installed on the fusel oil conveying pipeline 1; and the secondary water outlet adjusting assembly has the same structure as the main water outlet adjusting assembly.

[0045] In the embodiment, the fourth adjusting valve 8 is arranged to facilitate accurately adjusting the flow of the fusel oil in the fusel oil conveying pipeline 1, and cooperating with the flow of the desalted water, so as to facilitate accurately controlling the concentration of the fusel oil.

[0046] Embodiment 7

[0047] Referring to Figure 1 The methanol yield stripping tower system of the embodiment improves the methanol yield. On the basis of embodiment 6, the main water outlet adjusting assembly further comprises a self-adjusting valve 9. The self-adjusting valve 9 is installed on the fusel oil conveying pipeline 1, and the self-adjusting valve 9 is located between the fourth adjusting valve 8 and the outlet end of the fusel oil conveying pipeline 1.

[0048] In the embodiment, the self-adjusting valve 9 is arranged to automatically adjust the flow of the fusel oil according to the mixing condition of the fusel oil and the desalted water, so as to ensure that the mixed liquid is stably flowed into the stripping tower, and avoid the concentration unevenness caused by the flow fluctuation.

[0049] Embodiment 8:

[0050] With reference to Figure 1 , the methanol yield of the stripping tower system is improved, and on the basis of embodiment 7, the main water outlet adjusting assembly further comprises a fifth adjusting valve 10. The fifth adjusting valve 10 is installed on the fusel oil conveying pipeline 1, and the fifth adjusting valve 10 is located between the self-adjusting valve 9 and the outlet end of the fusel oil conveying pipeline 1.

[0051] In the embodiment, the fifth adjusting valve 10 cooperates with the self-adjusting valve 9 to finely adjust the adjusting result of the self-adjusting valve 9, so that the concentration of the mixed liquid reaches the optimal state.

[0052] Embodiment 9:

[0053] With reference to Figure 1 , the methanol yield of the stripping tower system is improved, and on the basis of embodiment 8, the main water outlet adjusting assembly further comprises a second low point discharge valve 11. The second low point discharge valve 11 is installed on the fusel oil conveying pipeline 1, and the second low point discharge valve 11 is located between the self-adjusting valve 9 and the fifth adjusting valve 10.

[0054] When the stripping tower system is normally operated, the valve of the second low point discharge valve 11 is in a closed state to prevent the fusel oil in the fusel oil conveying pipeline 1 from leaking; when too much fusel oil accumulates in the fusel oil conveying pipeline 1, the valve of the second low point discharge valve 11 is opened to discharge the excess fusel oil in the fusel oil conveying pipeline 1.

[0055] In the embodiment, the second low point discharge valve 11 is arranged to facilitate the timely discharge of excess fusel oil in the fusel oil conveying pipeline 1, so as to prevent the accumulated fusel oil from blocking the fusel oil conveying pipeline 1.

[0056] The working principle of the stripping tower system for improving the methanol yield is as follows: the fusel oil collected on the side of the atmospheric tower is conveyed into the fusel oil conveying pipeline 1; an operator determines the required amount of desalted water according to the concentration of the high-proportion difficult-to-volatile substances in the fusel oil, and then introduces the required amount of desalted water into the fusel oil conveying pipeline 1 to mix with the fusel oil and dilute the high-proportion difficult-to-volatile substances in the fusel oil by adjusting the opening degrees of the third adjusting valve 7, the first adjusting valve 3 and the second adjusting valve 5; the diluted fusel oil continues to flow along the fusel oil conveying pipeline 1 and finally flows into the stripping tower; in the stripping tower, the methanol is separated from the fusel oil, and the methanol is recovered.

[0057] The preferred embodiments of the utility model are not limited to the protection scope of the utility model, so that: all equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A stripping column system for increasing methanol recovery, characterized by, The system for improving the methanol yield of the stripping column comprises: a fusel oil conveying pipeline (1) and a desalted water conveying pipeline (2); the inlet end of the fusel oil conveying pipeline (1) is communicated with the atmospheric column, the outlet end of the fusel oil conveying pipeline (1) is communicated with the stripping column, and the fusel oil conveying pipeline (1) is used for conveying the fusel oil collected from the atmospheric column into the stripping column; the desalted water conveying pipeline (2) is communicated with the fusel oil conveying pipeline (1), and the desalted water conveying pipeline (2) is used for providing the desalted water into the fusel oil conveying pipeline (1).

2. The methanol recovery enhancing stripper column system of claim 1, wherein: The system for improving the methanol yield of the stripping column further comprises a desalted water flow adjusting assembly, and the desalted water flow adjusting assembly comprises a first adjusting valve (3). The first adjusting valve (3) is installed on the desalted water conveying pipeline (2).

3. The methanol recovery stripper column system of claim 2, wherein: The desalted water flow adjusting assembly further comprises a first low point drain valve (4). The first low point drain valve (4) is installed on the desalted water conveying pipeline (2), and the first low point drain valve (4) is located between the first adjusting valve (3) and the fusel oil conveying pipeline (1).

4. The methanol recovery enhancing stripper column system of claim 3, wherein: The desalted water flow adjusting assembly further comprises a second adjusting valve (5). The second adjusting valve (5) is installed on the desalted water conveying pipeline (2), and the second adjusting valve (5) is located between the first low point drain valve (4) and the fusel oil conveying pipeline (1).

5. The methanol recovery enhancing stripper column system of claim 4, wherein: The desalted water flow adjusting assembly further comprises a blind valve (6). The blind valve (6) is installed on the desalted water conveying pipeline (2), and the blind valve (6) is located between the first low point drain valve (4) and the second adjusting valve (5).

6. The methanol recovery enhancing stripper column system of claim 5, wherein: The desalted water flow adjusting assembly further comprises a third adjusting valve (7). The third adjusting valve (7) is installed on the desalted water conveying pipeline (2), and the third adjusting valve (7) is located between the first adjusting valve (3) and the inlet end of the desalted water conveying pipeline (2).

7. The methanol recovery stripper system of any one of claims 1-6, wherein: The system for improving the methanol yield of the stripping column further comprises a main water outlet adjusting assembly and a secondary water outlet adjusting assembly for adjusting the fusel oil flow. The main water outlet adjusting assembly and the secondary water outlet adjusting assembly are arranged side by side on the fusel oil conveying pipeline (1).

8. The methanol recovery enhancing stripper column system of claim 7, wherein: The main water outlet adjusting assembly comprises a fourth adjusting valve (8). The fourth adjusting valve (8) is installed on the fusel oil conveying pipeline (1). The secondary water outlet adjusting assembly has the same structure as the main water outlet adjusting assembly.

9. The methanol recovery enhancing stripper column system of claim 8, wherein: The main water outlet adjusting assembly further comprises a self-regulating valve (9). The self-regulating valve (9) is installed on the fusel oil conveying pipeline (1), and the self-regulating valve (9) is located between the fourth adjusting valve (8) and the outlet end of the fusel oil conveying pipeline (1).

10. The methanol recovery enhancing stripper column system of claim 9, wherein: The main water outlet adjusting assembly further comprises a fifth adjusting valve (10). The fifth adjusting valve (10) is installed on the fusel oil conveying pipeline (1), and the fifth adjusting valve (10) is located between the self-regulating valve (9) and the outlet end of the fusel oil conveying pipeline (1).

Images