Aromatic hydrocarbon adsorption two-set system

Abstract

The utility model relates to the technical field of chemical engineering, in particular to an aromatic hydrocarbon adsorption two-set system which comprises an extract tower, an extract tower return tank, a finished product tower, an extract tower bottom return line, an extract feed line, an extract tower top return line, a finished product tower bottom return line, a finished product tower top return line, an extract tower top pump branch line, a first overline and a second overline, one end of the extract tower bottom return line is connected to a tower bottom outlet of the extract tower, and the other end of the extract tower bottom return line is connected to an inlet I of the extract tower through an extract tower bottom pump and an extract tower feeding / tower bottom heat exchanger; and the extract feeding line is connected to the extract tower feeding / tower bottom heat exchanger. The problem that when the temperature of the air cooler at the top of the extract tower is too low in winter, frost heaving and freezing are caused can be solved, the temperature of an outlet of the air cooler at the top of the extract tower can be increased, and the anti-freezing and anti-freezing effects are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chemical industry technical field, concretely is a kind of aromatic hydrocarbon adsorption two sets of systems. BACKGROUND

[0002] Aromatic hydrocarbon plant adsorption two sets of device production process, extract liquid column top is provided with steam generator and condensate preheater and extract liquid column top air cooler parallel arrangement, the condensate water from power generation system first enters condensate preheater and full condensation after process material carries out preliminary heat exchange, process material is cooled to 130 DEG C and then to extract liquid column backflow tank.Preheated condensate water about 85 DEG C enters steam generator and column top process gas carries out heat exchange while byproduct 0.2MPaG Low-pressure saturated steam, after heat exchange full condensation after process material enters condensate preheater, and the steam drives generator to reach the purpose of power generation, this process needs to remove extract liquid column top air cooling completely, because the material in extract liquid column top air cooling in winter exists the defect of easy freezing, so it needs to prevent freezing and condensation to extract liquid column top air cooling walk extract liquid column top part material, can make the quantity of waste heat main steam reduce, to reduce the effect of waste heat power generation. SUMMARY

[0003] In view of the defects of prior art, the utility model provides a kind of aromatic hydrocarbon adsorption two sets of systems, it can solve extract liquid column top air cooler when winter temperature is too low, frost heaving freezing, by the present application can make extract liquid column top air cooler export temperature promote, reach the effect of preventing freezing and condensation.

[0004] In order to achieve the above object, the utility model provides a technical scheme for a kind of aromatic adsorption two sets of systems, including extract column, extract tank backflow tank, product column, extract column bottom backflow line, extract feed line, extract column top backflow line, product column bottom backflow line, product column top backflow line, extract column top pump branch line, first cross line and second cross line;The extract column bottom backflow line one end is connected to the column bottom outlet of the extract column, and the other end is connected to the inlet one of the extract column by extract column bottom pump and extract column feed / tank heat exchanger;The extract feed line is connected to the extract column feed / tank heat exchanger;The extract column top backflow line one end is connected to the column top outlet of the extract column, and the other end is connected to the inlet two of the extract column by extract tank backflow tank and extract column top pump, power valve, extract column outlet valve group, extract column top air cooler, extract column indicator and tank inlet valve are sequentially provided on the extract column top backflow line, and the power valve, extract column outlet valve group, extract column top air cooler, extract column indicator and tank inlet valve are arranged in the upstream of the extract tank backflow tank;The product column bottom backflow line one end is connected to the column bottom outlet of the product column, and the other end is connected to the inlet one of the product column by product column bottom pump and product column feed / tank heat exchanger;The product column top backflow line one end is connected to the column top outlet of the product column, and the other end is connected to the inlet two of the product column by product tank backflow tank and product column top pump, product column outlet valve group, product column top air cooler and product column indicator are sequentially provided on the product column top backflow line, and the product column outlet valve group, product column top air cooler and product column indicator are arranged in the upstream of the product tank backflow tank;The extract column top pump branch line one end is connected to the extract column top backflow line, and the other end is connected to the product column feed / tank heat exchanger, the joint one of the extract column top pump branch line and the extract column top backflow line is located in the downstream of the extract column top pump;The first cross line one end is connected to the extract column top backflow line, and the other end is connected to the product column top backflow line, the joint two of the first cross line and the extract column top backflow line is located between the extract column indicator and the tank inlet valve, the joint three of the first cross line and the product column top backflow line is located between the product column top air cooler and product column indicator, and the first cross line is provided with first cross line valve;The second cross line one end is connected to the product column top backflow line, and the other end is connected to the extract column top backflow line, the joint four of the second cross line and the product column top backflow line is located in the upstream of the product column outlet valve group, the joint five of the second cross line and the extract column top backflow line is located between power valve and extract column outlet valve group, and the second cross line is provided with second cross line valve.

[0005] Further, the extract column is provided with a backwashing line, a xylene reflux line and a xylene re-distillation reflux line, the xylene reflux line flows back to the extract column from the extract column through a xylene column top / extract column reboiler, and the xylene re-distillation reflux line flows back to the extract column from the extract column through a xylene re-distillation column top / extract column reboiler.

[0006] Further, the extract column feed / column bottom heat exchanger is provided with an extract heat exchange outlet line which is introduced into a desorbent / product column reboiler, and the extract heat exchange outlet line is provided with an extract diaphragm valve.

[0007] Further, the extract column top pump branch line is provided with a pump outlet valve.

[0008] Further, the extract column reflux tank is provided with an extract tank outlet line which is introduced into a flare system.

[0009] Further, the product column is provided with a column outlet line, a desorbent reflux line and a feed reflux line, the column outlet line is connected to a safety valve, the desorbent reflux line flows back to the product column from the product column through a desorbent / product column reboiler, and the feed reflux line flows back to the product column from the product column through a feed / product column reboiler.

[0010] Further, the product column feed / column bottom heat exchanger is provided with a product heat exchange outlet line which is introduced into a product tank, and the product heat exchange outlet line is provided with a product diaphragm valve.

[0011] Further, the product column top reflux line is provided with a product column top pump branch line which is introduced into a disproportionation reaction feed buffer tank, and a joint of the product column top reflux line and the product column top pump branch line is located downstream of a product column top pump.

[0012] Further, the product column reflux tank is provided with a product tank outlet line which is introduced into a flare system.

[0013] The application solves the problem of frost heaving and freezing of the extract column top air cooler when the temperature of the extract column top air cooler is too low in winter, and the extract column top air cooler can realize temperature rise of the outlet, achieve the effect of anti-freezing and anti-freezing, and generate more steam and generate more electricity, and part of the product column top air cooler can be stopped to cool, save energy and reduce consumption, so that the aromatic hydrocarbon adsorption two sets of systems can be long-term, continuous, stable and good operation. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The process flow chart of the application is shown in the figure.

[0015] In the figure: 100, extract column, 110, extract column bottom reflux line, 111, extract column bottom pump, 112, extract column feed / bottom heat exchanger, 1121, extract heat exchanger outlet line, 1122, extract diaphragm valve, 120, extract column overhead reflux line, 121, power valve, 122, extract column outlet valve set, 123, extract column overhead air cooler, 124, extract column indicator, 125, tank inlet valve, 126, extract tank reflux tank, 1261, extract tank outlet line, 127, extract column overhead pump, 1271, extract column overhead pump branch line, 1272, pump outlet valve, 130, backwash line, 140, xylene reflux line, 141, xylene column overhead / extract column reboiler, 150, xylene rerun reflux line, 151, xylene rerun column overhead / extract column reboiler,

[0016] 200, product column, 210, product column bottom reflux line, 211, product column bottom pump, 212, product column feed / bottom heat exchanger, 2121, product heat exchanger outlet line, 220, product column overhead reflux line, 221, product column outlet valve set, 222, product column overhead air cooler, 223, product column indicator, 224, product tank reflux tank, 2241, product tank outlet line, 225, product column overhead pump, 2251, product column overhead pump branch line, 230, column outlet line, 240, desorbent reflux line, 241, desorbent / product column reboiler, 250, feed reflux line, 251, feed / product column reboiler,

[0017] 300, first crossover line, 310, first crossover line valve,

[0018] 400, second crossover line, 410, second crossover line valve. DETAILED DESCRIPTION

[0019] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without some or all of these details under other conditions and / or methods. Therefore, the specific details disclosed herein should not be interpreted as limiting the scope of the present application but merely as exemplifying the preferred embodiments thereof.

[0020] As Figure 1As shown, the utility model discloses a kind of aromatic adsorption two sets of systems in one embodiment, including extract column 100, extract column backflow tank 126, finished product column 200, extract column bottom backflow line 110, extract feed line, extract column top backflow line 120, finished product column bottom backflow line 210, finished product column top backflow line 220, extract column top pump 127 branch line, first cross line 300 and second cross line 400;Extract column bottom backflow line 110 one end is connected to the bottom outlet of extract column 100, and the other end is connected to the inlet one of extract column 100 by extract column bottom pump 111 and extract column feed / column bottom heat exchanger 112;Extract feed line is connected to extract column feed / column bottom heat exchanger 112;Extract column top backflow line 120 one end is connected to the top outlet of extract column 100, and the other end is connected to the inlet two of the extract column 100 by extract column backflow tank 126 and extract column top pump 127, power valve 121, extract column outlet valve group 122, extract column top air cooler 123, extract column indicator 124 and tank inlet valve 125 are sequentially arranged on extract column top backflow line 120, and power valve 121, extract column outlet valve group 122, extract column top air cooler 123, extract column indicator 124 and tank inlet valve 125 are arranged in the upstream of extract column backflow tank 126;Finished product column bottom backflow line 210 one end is connected to the bottom outlet of finished product column 200, and the other end is connected to the inlet one of finished product column 200 by finished product column bottom pump 211 and finished product column feed / column bottom heat exchanger 212;Finished product column top backflow line 220 one end is connected to the top outlet of finished product column 200, and the other end is connected to the inlet two of finished product column 200 by finished product column backflow tank 224 and finished product column top pump 225, and finished product column top backflow line 220 is sequentially provided with finished product column outlet valve group 221, finished product column top air cooler 222 and finished product column indicator 223, and finished product column outlet valve group 221, finished product column top air cooler 222 and finished product column indicator 223 are arranged in the upstream of finished product column backflow tank 224;Extract column top pump 127 branch line one end is connected to extract column top backflow line 120, and the other end is connected to finished product column feed / column bottom heat exchanger 212, and the joint one of extract column top pump 127 branch line and extract column top backflow line is located in the downstream of extract column top pump 127;First cross line 300 one end is connected to extract column top backflow line 120, and the other end is connected to finished product column top backflow line 220, and the joint two of first cross line 300 and extract column top backflow line 120 is located between extract column indicator 124 and tank inlet valve 125, and the joint three of first cross line 300 and finished product column top backflow line 220 is located between finished product column top air cooler 222 and finished product column indicator 223, and first cross line 300 is provided with first cross line valve 310.The second cross line 400 is connected to the product column overhead reflux line 220 at one end and to the extract column overhead reflux line 120 at the other end. The connection of the second cross line 400 to the product column overhead reflux line 220 is at junction four, which is upstream of the product column outlet valve group 221. The connection of the second cross line 400 to the extract column overhead reflux line 120 is at junction five, which is between the motive valve 121 and the extract column outlet valve group 122. The second cross line 400 is provided with a second cross line valve 410.

[0021] It should be noted that the extract column outlet valve group comprises five lines, each provided with a valve, and the lines are connected in parallel. The product column outlet valve group 221 comprises four lines, each provided with a valve, and the lines are connected in parallel.

[0022] In an embodiment, the extract column is provided with a backwash line 130, a xylene reflux line 140 and a xylene redistillation reflux line. The xylene reflux line 140 is from the extract column 100, through the xylene column overhead / extract column reboiler, back to the extract column 100. The xylene redistillation reflux line is from the extract column 100, through the xylene redistillation column overhead / extract column reboiler 151, back to the extract column 100.

[0023] Further optimization, the xylene redistillation column overhead / extract column reboiler 151 is provided with a xylene column redistillation column overhead reflux line, which is from the xylene column redistillation column overhead, through the xylene redistillation column overhead / extract column reboiler 151, into the xylene column redistillation reflux tank. The xylene column overhead / extract column reboiler is provided with a xylene column overhead reflux line, which is from the xylene column overhead, through the xylene column overhead / extract column reboiler, into the xylene column reflux tank.

[0024] In an embodiment, the extract column feed / tank bottom heat exchanger 112 is provided with an extract heat exchange outlet line 1121, which leads to the desorbent / product column reboiler 241. The extract heat exchange outlet line 1121 is provided with an extract diaphragm valve 1122.

[0025] In an embodiment, the extract column overhead pump branch line is provided with a pump outlet valve 1272.

[0026] In an embodiment, the extract column reflux tank 126 is provided with an extract tank outlet line 1261, which leads to a flare system.

[0027] In an embodiment, the product column is provided with a column outlet line 230, a desorbent reflux line 240 and a feed reflux line 250. The column outlet line 230 is connected to a safety valve. The desorbent reflux line 240 is from the product column 200, through the desorbent / product column reboiler 241, back to the product column 200. The feed reflux line 250 is from the product column 200, through the feed / product column reboiler 251, back to the product column 200.

[0028] In an embodiment, the product column feed / bottom heat exchanger 212 is provided with a product heat exchange outlet line 2121 leading to a product tank, and the product heat exchange outlet line 2121 is provided with a product diaphragm valve.

[0029] In an embodiment, the product column overhead reflux line 220 is provided with a product column overhead pump 225 branch line leading to a disproportionation reaction feed buffer tank, and the junction of the product column overhead reflux line 220 and the product column overhead pump 225 branch line is located downstream of the product column overhead pump 225.

[0030] In an embodiment, the product column reflux tank is provided with a product tank outlet line 2241 leading to a flare system.

[0031] Further optimization, the feed / product column reboiler 251 is provided with an adsorption separation feed line from an adsorption separation feed buffer tank, which flows into an adsorption separation feed air cooler through the feed / product column reboiler 251; the desorbent / product column reboiler 241 is provided with a draw-off liquid feed line from the draw-off liquid column feed / bottom heat exchanger 112, which flows into a desorbent air cooler through the desorbent / product column reboiler 241.

[0032] In the above-mentioned aromatic adsorption two-system, when put into use, ensure that the newly added valve product column outlet valve group 221 is fully open, the first cross-line valve 310 is fully open, the valve draw-off liquid outlet valve group is fully open, the second cross-line valve 410 is slowly opened by external operation, and after the air-cooled draw-off liquid column overhead air cooler 123 is heated, the valve product column outlet valve group 221 is slowly closed, the internal operation observes that the temperature of the product column indicator 223 is controlled at 62 DEG C, and stops closing the valve, and the air cooling of the product column overhead air cooler 222 is adjusted according to the temperature.

[0033] Flow: from the product column 200 top outlet → product column overhead air cooler 222 → draw-off liquid column overhead air cooler 123 → product column reflux tank 224.

[0034] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0036] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless otherwise specifically defined and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly contacted through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature. It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this paper are only for illustrative purposes, and are not the only embodiment.

Claims

1. An aromatic adsorption two-suit system, characterized in that: comprising extract column; extract column reflux drum; product column; extract column bottoms reflux line, one end connected to the extract column bottoms outlet, the other end connected to the extract column inlet one through extract column bottoms pump and extract column feed / column bottoms heat exchanger; extract feed line, connected to the extract column feed / column bottoms heat exchanger; extract column overhead reflux line, one end connected to the extract column overhead outlet, the other end connected to the extract column inlet two through extract column reflux drum and extract column overhead pump, the extract column overhead reflux line is sequentially provided with power valve, extract column outlet valve group, extract column overhead air cooler, extract column indicator and tank inlet valve, the power valve, extract column outlet valve group, extract column overhead air cooler, extract column indicator and tank inlet valve are provided upstream of the extract column reflux drum; product column bottoms reflux line, one end connected to the product column bottoms outlet, the other end connected to the product column inlet one through product column bottoms pump and product column feed / column bottoms heat exchanger; product column overhead reflux line, one end connected to the product column overhead outlet, the other end connected to the product column inlet two through product column reflux drum and product column overhead pump, the product column overhead reflux line is sequentially provided with product column outlet valve group, product column overhead air cooler and product column indicator, the product column outlet valve group, product column overhead air cooler and product column indicator are provided upstream of the product column reflux drum; extract column overhead pump branch line, one end connected to the extract column overhead reflux line, the other end connected to the product column feed / column bottoms heat exchanger, the junction one of the extract column overhead pump branch line and the extract column overhead reflux line is located downstream of the extract column overhead pump; first cross line, one end connected to the extract column overhead reflux line, the other end connected to the product column overhead reflux line, the junction two of the first cross line and the extract column overhead reflux line is located between the extract column indicator and the tank inlet valve, the junction three of the first cross line and the product column overhead reflux line is located between the product column overhead air cooler and product column indicator, the first cross line is provided with first cross line valve; second cross line, one end connected to the product column overhead reflux line, the other end connected to the extract column overhead reflux line, the junction four of the second cross line and the product column overhead reflux line is located upstream of the product column outlet valve group, the junction five of the second cross line and the extract column overhead reflux line is located between the power valve and the extract column outlet valve group, the second cross line is provided with second cross line valve.

2. The aromatic adsorption two-set system according to claim 1, characterized in that: The extract column is provided with backwashing line, xylene reflux line and xylene redistillation reflux line, the xylene reflux line flows from the extract column to the extract column through xylene column overhead / extract column reboiler, the xylene redistillation reflux line flows from the extract column to the extract column through xylene redistillation column overhead / extract column reboiler.

3. The aromatic hydrocarbon adsorption two-set system according to claim 1, characterized in that: The extract column feed / column bottoms heat exchanger is provided with extract heat exchange outlet line, which introduces desorbent / product column reboiler, the extract heat exchange outlet line is provided with extract diaphragm valve.

4. The aromatic hydrocarbon adsorption two-set system according to claim 1, characterized in that: The extract column overhead pump branch line is provided with pump outlet valve.

5. The aromatic hydrocarbon adsorption two-set system according to claim 1, characterized in that: The draw solution tank reflux tank is provided with a draw solution tank outlet line, which is introduced into a flare system.

6. The aromatic hydrocarbon adsorption two-set system according to claim 1, characterized in that: The product column is provided with a column outlet line, a desorbent reflux line and a feed reflux line, the column outlet line is connected to a safety valve, the desorbent reflux line flows from the product column to the product column through a desorbent / product column reboiler, and the feed reflux line flows from the product column to the product column through a feed / product column reboiler.

7. The aromatic hydrocarbon adsorption two-set system according to claim 1, characterized in that: The product column feed / tank bottom heat exchanger is provided with a product heat exchange outlet line, which is introduced into a product tank, and the product heat exchange outlet line is provided with a product diaphragm valve.

8. The aromatic hydrocarbon adsorption two-set system according to claim 1, characterized in that: The product column top reflux line is provided with a product column top pump branch line, which is introduced into a disproportionation reaction feed buffer tank, and a joint of the product column top reflux line and the product column top pump branch line is located downstream of the product column top pump.

9. The aromatic hydrocarbon adsorption two-set system according to claim 1, characterized in that: The product tank reflux tank is provided with a product tank outlet line, which is introduced into a flare system.

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