阅读说明：本技术 改造后的芳烃吸附系统 (Arene adsorption system after transformation ) 是由 隋建勇 郑豪 卢春智 于 2019-12-20 设计创作，主要内容包括：本发明属于化工工艺领域,具体涉及到一种改造后的芳烃吸附系统,PDEB入料管线分别连接至第一过滤器、第二过滤器,第一过滤器塔顶通过第一过滤器安全阀管线连接过滤器安全阀总管线,第二过滤器塔顶通过第二过滤器安全阀管线连接过滤器安全阀总管线,过滤器安全阀总管线连接至总排气管线,总排气管线连接至抽余液塔；第二吸附塔塔顶通过第二吸附塔排气线连接至总排气管线,第二吸附塔塔顶通过第二吸附塔安全阀连接至总排气管线；第一吸附塔循环管线由第一吸附塔塔底引至第二吸附塔塔顶,第二吸附塔循环管线由第二吸附塔塔底引至第一吸附塔塔顶,总排气管线上设置单向阀。(The invention belongs to the field of chemical processes, and particularly relates to a modified aromatic adsorption system.A PDEB (polymer dispersed ethylene-propylene-diene monomer) feeding pipeline is respectively connected to a first filter and a second filter, the top of the first filter is connected with a filter safety valve main pipeline through a first filter safety valve pipeline, the top of the second filter is connected with a filter safety valve main pipeline through a second filter safety valve pipeline, the filter safety valve main pipeline is connected to a main exhaust pipeline, and the main exhaust pipeline is connected to a raffinate extracting tower; the top of the second adsorption tower is connected to the main exhaust pipeline through a second adsorption tower exhaust line, and the top of the second adsorption tower is connected to the main exhaust pipeline through a second adsorption tower safety valve; the first adsorption tower circulation pipeline is led to the top of the second adsorption tower from the bottom of the first adsorption tower, the second adsorption tower circulation pipeline is led to the top of the first adsorption tower from the bottom of the second adsorption tower, and the main exhaust pipeline is provided with a one-way valve.)

1. The arene adsorption system after transformation is characterized in that: the device comprises a first filter, a second filter, a PDEB feeding pipeline, a first filter tower top discharging pipeline, a second filter tower top discharging pipeline, a first filter safety valve pipeline, a second filter safety valve pipeline, a filter safety valve main pipeline, an adsorption tower feeding pipeline, a first adsorption tower exhaust line, a first adsorption tower safety valve, a second adsorption tower exhaust line, a second adsorption tower safety valve, a first adsorption tower circulating pipeline, a second adsorption tower circulating pipeline, a main exhaust line and a raffinate extracting tower; the PDEB feeding pipeline is respectively connected to a first filter and a second filter, the top of the first filter is connected with a filter safety valve main pipeline through a first filter safety valve pipeline, the top of the second filter is connected with a filter safety valve main pipeline through a second filter safety valve pipeline, the filter safety valve main pipeline is connected to a total exhaust pipeline, and the total exhaust pipeline is connected to the raffinate tower; the first filter tower top discharge pipeline and the second filter tower top discharge pipeline are converged to the adsorption tower feeding pipeline, the first adsorption tower top is connected to a main exhaust pipeline through a first adsorption tower exhaust pipeline, the first adsorption tower top is connected to the main exhaust pipeline through a first adsorption tower safety valve, the second adsorption tower top is connected to the main exhaust pipeline through a second adsorption tower exhaust pipeline, and the second adsorption tower top is connected to the main exhaust pipeline through a second adsorption tower safety valve; the first adsorption tower circulation pipeline is led to the top of the second adsorption tower from the bottom of the first adsorption tower, the second adsorption tower circulation pipeline is led to the top of the first adsorption tower from the bottom of the second adsorption tower, and the main exhaust pipeline is provided with a one-way valve.

2. The engineered aromatics adsorption system of claim 1, wherein: the specifications of the one-way valve are DN300 and 2 TB.

3. The engineered aromatics adsorption system of claim 1, wherein: a first valve is arranged at the downstream of the one-way valve.

4. The engineered aromatics adsorption system of claim 1, wherein: and a first circulating pump is arranged on the circulating pipeline of the first adsorption tower, and a second circulating pump is arranged on the circulating pipeline of the second adsorption tower.

5. The engineered aromatics adsorption system of claim 4, wherein: the first overline is connected to before the second circulating pump by before the first circulating pump.

6. The engineered aromatics adsorption system of claim 5, wherein: the second overline is connected to behind the second circulating pump behind the first circulating pump.

7. The engineered aromatics adsorption system of claim 6, wherein: the first crossover is connected to the second circulating pump through the third circulating pump.

8. The engineered aromatics adsorption system of claim 1, wherein: a first exhaust sight glass is arranged on the exhaust line of the first adsorption tower; and a second exhaust viewing mirror is arranged on the second adsorption tower exhaust line.

9. The engineered aromatics adsorption system of claim 1, wherein: a second valve is arranged on the exhaust line of the first adsorption tower; and a third valve is arranged on the exhaust line of the second adsorption tower.

Technical Field

The invention belongs to the field of chemical processes, and particularly relates to a modified aromatic adsorption system.

Background

When the adsorption tower is started and normally produced, liquid impact often occurs at a joint of a converged raffinate tower wall, the liquid impact impacts a raffinate tower wall valve and a tower wall pipeline flange to cause flange leakage, even potential safety hazards of fire hazard (the raffinate tower is controlled at 220 ℃ and belongs to a high-temperature tower), the device cannot run and needs to be stopped and overhauled, components in the adsorption tower can be changed due to the fact that the adsorption device is stopped, the running period is long when the adsorption tower is started again, products cannot reach the qualified standard, and the energy consumption of the device is very large.

In view of the huge loss, the invention discloses a method which does not need to report waste adsorbent, can eliminate the hidden trouble of pipeline liquid impact by only carrying out one-time reconstruction in the shutdown state, and reduces the shutdown and accident potential safety hazards of the device, thereby achieving the purpose of maintaining long-period safe operation.

Disclosure of Invention

In view of the defects in the prior art, the invention provides a modified aromatic hydrocarbon adsorption system which can eliminate the hidden danger of pipeline liquid impact, thereby achieving the purpose of maintaining long-period safe operation.

In order to achieve the above purpose, the technical scheme adopted by the invention is an improved aromatic hydrocarbon adsorption system, which comprises a first filter, a second filter, a PDEB feeding pipeline, a first filter tower top discharging pipeline, a second filter tower top discharging pipeline, a first filter safety valve pipeline, a second filter safety valve pipeline, a filter safety valve main pipeline, an adsorption tower feeding pipeline, a first adsorption tower exhaust line, a first adsorption tower safety valve, a second adsorption tower exhaust line, a second adsorption tower safety valve, a first adsorption tower circulation pipeline, a second adsorption tower circulation pipeline, a total exhaust line and a raffinate extracting tower; the PDEB feeding pipeline is respectively connected to a first filter and a second filter, the top of the first filter is connected with a filter safety valve main pipeline through a first filter safety valve pipeline, the top of the second filter is connected with a filter safety valve main pipeline through a second filter safety valve pipeline, the filter safety valve main pipeline is connected to a total exhaust pipeline, and the total exhaust pipeline is connected to the raffinate tower; the first filter tower top discharge pipeline and the second filter tower top discharge pipeline are converged to an adsorption tower feeding pipeline, the adsorption tower feeding pipeline is connected to a first adsorption tower, the first adsorption tower top is connected to a main exhaust pipeline through a first adsorption tower exhaust pipeline, the first adsorption tower top is connected to the main exhaust pipeline through a first adsorption tower safety valve, the second adsorption tower top is connected to the main exhaust pipeline through a second adsorption tower exhaust pipeline, and the second adsorption tower top is connected to the main exhaust pipeline through a second adsorption tower safety valve; the first adsorption tower circulation pipeline is led to the top of the second adsorption tower from the bottom of the first adsorption tower, the second adsorption tower circulation pipeline is led to the top of the first adsorption tower from the bottom of the second adsorption tower, and the main exhaust pipeline is provided with a one-way valve.

Preferably, the specification of the one-way valve is DN300 and 2 TB.

Further, a first valve is arranged downstream of the one-way valve.

Furthermore, a first circulating pump is arranged on the circulating pipeline of the first adsorption tower, and a second circulating pump is arranged on the circulating pipeline of the second adsorption tower.

Further, the first span line is connected to the second circulating pump by the first circulating pump in front of the first circulating pump.

Furthermore, the second overline is connected to the back of second circulating pump behind by first circulating pump.

Further, the first crossover is connected to the second circulating pump through a third circulating pump.

Further, a first exhaust view mirror is arranged on the exhaust line of the first adsorption tower; and a second exhaust viewing mirror is arranged on the second adsorption tower exhaust line.

Further, a second valve is arranged on the exhaust line of the first adsorption tower; and a third valve is arranged on the exhaust line of the second adsorption tower.

After the transformation is finished, during normal production, the transformation system is put into use, the first valve is opened, the one-way valve is put into use, liquid filling and gas exhausting are carried out on the first filter and the second filter because the temperature of the raffinate tower is raised firstly during normal start-up, and the first adsorption tower safety valve and the second adsorption tower safety valve are opened for gas exhausting before the temperature of the raffinate tower is raised.

When the adsorption tower is started to work, liquid is filled and exhausted, the first valve is slowly closed, the second valve and the third valve are opened greatly, the first adsorption tower and the second adsorption tower are exhausted, and after the adsorption tower is exhausted, the first valve is fully opened, so that the total exhaust pipeline is ensured to be in a complete use state. The total vent line was monitored for liquid knock mitigation at the raffinate column during normal production.

The invention has the beneficial effects that: can effectively prevent the hot materials in the raffinate tower from contacting with the cold materials in the emptying pipeline, reduce liquid impact generated during heat exchange between the pipeline and the tower, and reduce the risk of safety accidents.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the figure: 1. a first filter, 2, a second filter, 3, a PDEB feeding pipeline, 4, a first filter tower top discharging pipeline, 5, a second filter tower top discharging pipeline, 6, a first filter safety valve pipeline, 7, a second filter safety valve pipeline, 8, a filter safety valve general pipeline, 9, an adsorption tower feeding pipeline, 10, a first adsorption tower, 11, a first adsorption tower exhaust line, 12, a first adsorption tower safety valve, 13, a second adsorption tower, 14, a second adsorption tower exhaust line, 15, a second adsorption tower safety valve, 16, a first adsorption tower circulating pipeline, 17, a second adsorption tower circulating pipeline, 18, a general exhaust line, 19, a raffinate tower, 20, a fourth valve, 21, a one-way valve, 22, a first valve, 23, a first circulating pump, 24, a second circulating pump, 25, a third circulating pump, 26, a first exhaust sight glass, 27, a second exhaust sight glass, 28. a second valve, 29, a third valve, 30, a fifth valve.

Detailed Description

The structure of the invention is further explained in the following with the attached drawings of the specification.

The reformed aromatic adsorption system comprises a first filter 1, a second filter 2, a PDEB feeding pipeline 3, a first filter tower top discharging pipeline 4, a second filter tower top discharging pipeline 5, a first filter safety valve pipeline 6, a second filter safety valve pipeline 7, a filter safety valve main pipeline 8, an adsorption tower feeding pipeline 9, a first adsorption tower 10, a first adsorption tower exhaust line 11, a first adsorption tower safety valve 12, a second adsorption tower 13, a second adsorption tower exhaust line 14, a second adsorption tower safety valve 15, a first adsorption tower circulating pipeline 16, a second adsorption tower circulating pipeline 17, a main exhaust line 18 and a raffinate extracting tower 19; the PDEB feeding pipeline 3 is respectively connected to a first filter 1 and a second filter 2, the top of the first filter 1 is connected with a filter safety valve main pipeline 8 through a first filter safety valve pipeline 6, the top of the second filter 2 is connected with a filter safety valve main pipeline 8 through a second filter safety valve pipeline 7, the filter safety valve main pipeline 8 is connected to a main exhaust pipeline 18, and the main exhaust pipeline 18 is connected to a raffinate tower 19; the first filter tower top discharge pipeline 4 and the second filter tower top discharge pipeline 5 are converged to an adsorption tower feeding pipeline 9, the adsorption tower feeding pipeline 9 is connected to a first adsorption tower 10, the tower top of the first adsorption tower 10 is connected to a main exhaust pipeline 18 through a first adsorption tower exhaust pipeline 11, the tower top of the first adsorption tower 10 is connected to the main exhaust pipeline 18 through a first adsorption tower safety valve 12, the tower top of the second adsorption tower 13 is connected to the main exhaust pipeline 18 through a second adsorption tower exhaust pipeline 14, and the tower top of the second adsorption tower 13 is connected to the main exhaust pipeline 18 through a second adsorption tower safety valve 15; the first adsorption tower circulating line 16 is led to the top of the second adsorption tower 13 from the bottom of the first adsorption tower 10, the second adsorption tower circulating line 17 is led to the top of the first adsorption tower 10 from the bottom of the second adsorption tower 13, and a check valve 21 is arranged on the total exhaust line 18.

Preferably, the specification of the check valve 21 is DN300, 2 TB.

Further, a first valve 22 is provided downstream of the check valve 21.

Further, a first circulation pump 23 and a fourth valve 20 are provided in the first adsorption tower circulation line 16, and a second circulation pump 24 and a fifth valve 30 are provided in the second adsorption tower circulation line 17.

Further, first jumper 25 is connected before the pump of first circulation pump 23 to the pump of second circulation pump 24.

Further, second jumper 26 is pumped by first circulating pump 23 and then connected to second circulating pump 24.

Further, the first jumper 25 is connected to the second circulation pump 24 through a third circulation pump 25.

Further, a first exhaust view mirror 26 is arranged on the exhaust line 11 of the first adsorption tower; a second exhaust view mirror 27 is provided on the second adsorption tower exhaust line 14.

Further, a second valve 28 is arranged on the exhaust line 11 of the first adsorption tower; a third valve 29 is provided on the second adsorption column vent line 14.

When the reforming system is used in normal production after reforming is finished, as shown in the attached drawing 1, the first valve 22 and the one-way valve 21 are opened, liquid filling and gas exhausting are carried out on the first filter 1 and the second filter 2 because the temperature of the raffinate tower 19 is raised firstly during normal start-up, and the first adsorption tower safety valve 12 and the second adsorption tower safety valve 15 are opened for gas exhausting before the temperature of the raffinate tower 19 is raised.

When the adsorption tower is started to work, liquid is filled and the gas is exhausted, the first valve 22 is slowly closed, the second valve 28 and the third valve 29 are opened to exhaust the gas of the first adsorption tower 10 and the second adsorption tower 13, and after the gas exhaust of the adsorption towers is finished, the first valve 22 is fully opened to ensure that the total gas exhaust pipeline 18 is in a complete use state. The total vent line 18 is monitored for liquid knock mitigation at the raffinate column during normal production.

It should be noted that, in the figure, the first adsorption tower 10 and the second adsorption tower 13 are filled with adsorbents, the adsorbents in each tower are divided into 12 beds, each bed is connected with each program control valve, the liquid in the two adsorption towers forms a closed cycle from top to bottom by a tower bottom pump, the process materials entering and exiting the adsorption towers enter through switch valves, and the positions of the feed inlet and the discharge outlet of the adsorption towers are changed by periodically switching 144 switch valves on the tower walls of the two towers to achieve the separation of the materials, which is a simulated moving bed principle.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.