Fluidized bed residual oil hydrocracking fractionation light dirty oil recovery system

Abstract

The utility model relates to a boiling bed residual oil hydrocracking fractionation recovery light dirty oil system. The system comprises an acidic water extraction device unit, a tank field unit, a residual oil hydrocracking device unit and a light dirty oil recycling process, the acidic water extraction device unit comprises an acidic water extraction device sump oil tank and a sump oil tank extraction pump; an acidic water extraction device slop oil tank in the acidic water extraction device unit is connected to the tank area unit through an extraction line connected to a slop oil tank extraction pump; the tank field unit is connected to an atmospheric and vacuum distillation unit through a pipeline, and the pipeline connected with the atmospheric and vacuum distillation unit is connected to the residual oil hydrocracking unit through a feed line of the residual oil hydrocracking unit; the light dirty oil recycling process is led out from an extraction line of an extraction pump of a dirty oil tank, is merged into the tank area unit and is connected to the residual oil hydrocracking device unit; the light dirty oil which is originally reprocessed by an atmospheric and vacuum distillation unit is directly introduced into a fractionation atmospheric tower of a residual oil hydrocracking unit through a light dirty oil reprocessing line, so that the reprocessing flow is reduced; and the recycling process is more energy-saving and environment-friendly.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of boiling bed residual oil hydrocracking fractionation recovery light sludge oil systems, belong to oil refining field. BACKGROUND

[0002] In the production process of petrochemical industry, various sludge will inevitably be produced, at present, according to the development of sludge disposal technology in China, domestic enterprises in various regions adopt atmospheric, vacuum distillation process, more advanced molecular distillation and thin film distillation technology also gradually begin to use, in the aspect of sludge recycling, China's waste oil treatment technology is gradually advancing towards economization, environmental protection and advancement. At present, we mainly use sludge dewatering, atmospheric and vacuum distillation unit for recycling in refinery, which seriously affects the load of atmospheric and vacuum distillation unit and increases the energy consumption of the whole plant. UTILITY MODEL CONTENT

[0003] In view of the above technical defects, the purpose of the utility model is to provide a kind of boiling bed residual oil hydrocracking fractionation recovery light sludge oil system, by changing the light sludge recycling mode, light sludge is directly recycled by atmospheric column, which reduces the recycling process, reduces the load of atmospheric and vacuum distillation unit and the energy consumption of the whole plant.

[0004] In order to achieve the above purpose, the technical scheme adopted by the utility model is: a kind of boiling bed residual oil hydrocracking fractionation recovery light sludge oil system, comprising: acidic water extraction device unit, tank area unit, residual oil hydrocracking device unit and light sludge recycling process;The acidic water extraction device unit includes acidic water extraction device sludge tank and sludge tank production pump;The acidic water extraction device sludge tank in acidic water extraction device unit is connected to tank area unit by connecting to the production line of sludge tank production pump;The tank area unit is connected to atmospheric and vacuum distillation unit by pipeline, and the pipeline connected to atmospheric and vacuum distillation unit is connected to residual oil hydrocracking device unit by residual oil hydrocracking device unit feed line;The light sludge recycling process is led out from the production line of sludge tank production pump and into tank area unit and connected to residual oil hydrocracking device unit;

[0005] Further, the production line connected to the sludge tank production pump includes pump inlet line and pump outlet line, and the pump outlet valve is arranged on the pump outlet line near the pump outlet position of the sludge tank production pump;

[0006] Further, the tank area unit includes tank area tank and tank bottom pump;The pump outlet line of the production line in the acidic water extraction device unit is connected to the side wall of tank area tank, and double control valve and guide valve are arranged at the position close to tank area tank;

[0007] Further, the condensed oil in the acidic water extraction device sludge tank is from solvent regeneration, and one side of the bottom of the acidic water extraction device sludge tank is connected to the sludge tank production pump by pump inlet line.

[0008] Further, the tank bottom of the tank area is connected with a tank bottom pump through a pipeline, and the outlet pipeline of the tank bottom pump is connected with a pipeline leading to the atmospheric-vacuum distillation unit;

[0009] Further, the residue hydrocracking unit comprises a fractionating atmospheric tower, an atmospheric tower cold feed flow, an LS flow and a feed line connected with the LS flow; the atmospheric tower cold feed flow comprises a cold low-pressure separation tank, a reflux / cold low-oil heat exchanger, a warm high-oil / cold low-oil heat exchanger, a hot low-gas / cold low-oil heat exchanger and a HAGO product / cold low-oil heat exchanger; the bottom of the cold low-pressure separation tank is connected with the reflux / cold low-oil heat exchanger, the warm high-oil / cold low-oil heat exchanger, the hot low-gas / cold low-oil heat exchanger and the HAGO product / cold low-oil heat exchanger in sequence through pipelines, and communicates with the side wall of the fractionating atmospheric tower; the LS flow is connected at a position between the warm high-oil / cold low-oil heat exchanger and the hot low-gas / cold low-oil heat exchanger; the front end of the feed line is connected with the LS flow.

[0010] Further, the LS flow comprises an LS pipeline, the LS pipeline is provided with a first control valve and a first blind plate at a position close to the warm high-oil / cold low-oil heat exchanger, and is provided with a one-way valve, a second blind plate and a guide valve at a position away from the first blind plate; the LS pipeline is a steam purging pipeline of the hot low-gas / cold low-oil heat exchanger.

[0011] Further, the front end of the feed line is led to a position between the guide valve and the first blind plate of the LS pipeline.

[0012] Further, one end of the pipeline connected with the atmospheric-vacuum distillation unit is connected with the atmospheric-vacuum distillation unit, and the other end of the pipeline is connected with the feed line of the residue hydrocracking unit.

[0013] The HAGO product in the HAGO product / cold low-oil heat exchanger refers to heavy diesel oil of the atmospheric tower.

[0014] Further, the light sludge oil back-refining flow comprises a light sludge oil back-refining line and a double control valve and a guide valve arranged on the light sludge oil back-refining line; the light sludge oil back-refining line is led out from the front end of the pump outlet valve of the sludge oil tank extraction pump and connected with the feed line of the residue hydrocracking unit.

[0015] Further, the side wall of the fractionating atmospheric tower is further provided with pipelines connected with diesel oil outlets respectively, and the top of the fractionating atmospheric tower is further provided with branch pipelines leading to acid gas to light hydrocarbon recovery and naphtha to light hydrocarbon recovery respectively.

[0016] The flow of the light sludge oil recovery system adopting the scheme is as follows:

[0017] The light sludge oil in the sludge tank of the sour water stripping device is pumped out by a sludge tank pumping-out pump and directly sent to the feed line of the residue hydrocracking device unit through the light sludge oil recycling line of the light sludge oil recycling process, and flows from the feed line to the LS process;

[0018] In the atmospheric column cold feed process of the residue hydrocracking device unit, the cold feed flows from the cold low oil in the cold low-pressure separation tank, flows through the diesel middle section reflux / cold low oil heat exchanger and the warm high oil / cold low oil heat exchanger, the cold feed is mixed with the light sludge oil flowing out from the above-mentioned feed line to the LS process, flows through the hot low oil gas / cold low oil heat exchanger and the HAGO product / cold low oil heat exchanger to mix with the cold low oil, and after being warmed up, enters the fractionating atmospheric column together, and is separated into naphtha, diesel and a small amount of wax oil again in the fractionating atmospheric column.

[0019] The beneficial effects of the technical scheme of the utility model are as follows:

[0020] The light sludge oil originally recycled through the atmospheric and vacuum device is directly introduced into the fractionating atmospheric column of the residue hydrocracking device through the light sludge oil recycling line, the recycling process is reduced, the recycling process is more energy-saving and environmentally friendly, the load of the atmospheric and vacuum device is reduced, the energy consumption of the whole plant is reduced, and beneficial effects such as increased material benefits, energy saving and consumption reduction and environmental protection emission are brought. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The utility model discloses a structure diagram.

[0022] In the drawing, 1, the sludge tank of the sour water stripping device, 2, the sludge tank pumping-out pump, 3, the pipeline connected with the atmospheric and vacuum device, 4, the feed line, 5, the pump inlet line, 6, the pump outlet line, 7, the pump outlet valve, 8, the tank area tank, 9, the tank bottom pump, 10, the fractionating atmospheric column, 11, the cold low-pressure separation tank, 12, the reflux / cold low oil heat exchanger, 13, the warm high oil / cold low oil heat exchanger, 14, the hot low oil gas / cold low oil heat exchanger, 15, the HAGO product / cold low oil heat exchanger, 16, the LS pipeline, 17, the first control valve, 18, the first blind plate, 19, the one-way valve, 20, the second blind plate, 21, the guide valve, 22, the light sludge oil recycling line, a, the sour water stripping device unit, b, the tank area unit, c, the residue hydrocracking device unit. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more apparent, understandable and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0024] The present application is described in detail with reference to an embodiment of a residue hydrogenation workshop.

[0025] The light sludge produced by the acid water stripping device sludge tank is pumped to the tank farm through the sludge tank production pump, and the tank farm tank is pumped to the atmospheric and vacuum distillation device through the tank bottom pump. Due to the continuous high load operation of the atmospheric and vacuum distillation device, the introduction of light sludge will occupy the original crude oil processing load, affecting the overall high load operation of the whole plant.

[0026] Referring to Figure 1 A boiling bed residue hydrocracking fractionation light sludge recovery system is shown in the drawing, which comprises: an acid water stripping device unit a, a tank farm unit b, a residue hydrocracking device unit c and a light sludge recycling process; the acid water stripping device unit comprises an acid water stripping device sludge tank 1 and a sludge tank production pump 2; the acid water stripping device sludge tank 1 in the acid water stripping device unit is connected to the tank farm unit through the production line connected to the sludge tank production pump 2; the tank farm unit is connected to the atmospheric and vacuum distillation device through the pipeline, and the pipeline 3 connected to the atmospheric and vacuum distillation device is connected to the residue hydrocracking device unit through the residue hydrocracking device unit feed line 4; the light sludge recycling process is introduced from the production line of the sludge tank production pump 2, enters the tank farm unit b and is connected to the residue hydrocracking device unit c;

[0027] Further, the production line connected to the sludge tank production pump 2 comprises a pump inlet line 5 and a pump outlet line 6, and a pump outlet valve 7 is arranged on the pump outlet line 6 near the pump outlet position of the sludge tank production pump 2;

[0028] Further, the tank farm unit b comprises a tank farm tank 8 and a tank bottom pump 9; the pump outlet line 6 of the production line in the acid water stripping device unit is connected to the side wall of the tank farm tank 8, and a double control valve and a guide valve are arranged near the tank farm tank 8;

[0029] Further, the condensed oil in the acid water stripping device sludge tank 1 is from solvent regeneration, one side of the bottom of the acid water stripping device sludge tank 1 is connected to the sludge tank production pump 2 through the pump inlet line 5, and the other side of the bottom of the acid water stripping device sludge tank 1 is also connected to the underground acid water tank through the pipeline and the control valve.

[0030] Further, the tank area tank 8 is connected to a tank bottom pump 9 through a pipeline, and the outlet pipeline of the tank bottom pump 9 is connected to the pipeline 3 leading to the atmospheric-vacuum distillation unit;

[0031] Further, the residue hydrocracking unit c comprises a fractionating atmospheric tower 10, an atmospheric tower cold feed process, an LS process, and a feed line 4 connected to the LS process; the atmospheric tower cold feed process comprises a cold low-pressure separation tank 11, a reflux / cold low-oil heat exchanger 12, a warm high-oil / cold low-oil heat exchanger 13, a hot low-gas / cold low-oil heat exchanger 14, and a HAGO product / cold low-oil heat exchanger 15; the bottom of the cold low-pressure separation tank 11 is connected to the reflux / cold low-oil heat exchanger 12, the warm high-oil / cold low-oil heat exchanger 13, the hot low-gas / cold low-oil heat exchanger 14, and the HAGO product / cold low-oil heat exchanger 15 in sequence through pipelines, and is in communication with the sidewall of the fractionating atmospheric tower 10; the warm high-oil / cold low-oil heat exchanger 13 and the hot low-gas / cold low-oil heat exchanger 14 are connected to the LS process; the front end of the feed line 4 is connected to the LS process;

[0032] Further, the LS process comprises an LS pipeline 16, a first control valve 17 and a first blind plate 18 arranged at a position close to the warm high-oil / cold low-oil heat exchanger 13, a one-way valve 19, a second blind plate 20, and a guide valve 21 arranged on the LS pipeline 16 at a position away from the first blind plate 18;

[0033] Further, the front end of the feed line 4 is led to a position between the guide valve 21 and the first blind plate 18 of the LS pipeline 16;

[0034] Further, the feed line 4 is provided with double control valves, and a guide valve and a blind plate arranged between the double control valves;

[0035] Further, one end of the pipeline 6 connected to the atmospheric-vacuum distillation unit is connected to the atmospheric-vacuum distillation unit, and the other end of the pipeline 6 is connected to the feed line 4 of the residue hydrocracking unit;

[0036] Further, the light sludge oil back-refining process comprises a light sludge oil back-refining line 22, and double control valves and a guide valve arranged on the light sludge oil back-refining line 22; the light sludge oil back-refining line 22 is led out from the front end of the pump outlet valve 7 of the sludge oil tank take-out pump 2 and connected to the feed line 4 of the residue hydrocracking unit;

[0037] Further, the sidewall of the fractionating atmospheric tower 10 is further provided with pipelines connected to diesel outlet devices, and the top of the fractionating atmospheric tower 10 is further provided with branch pipelines leading to acid gas to light hydrocarbon recovery and naphtha to light hydrocarbon recovery; the naphtha, diesel, and a small amount of wax oil separated by rectification in the fractionating atmospheric tower 10 are sent through respective pipelines.

[0038] The process of the light oil recovery system using the scheme is:

[0039] The light oil in the acid water stripping device oil tank 1 is extracted from the oil tank extraction pump 2, and is directly sent to the feed line 4 of the residue hydrocracking device unit through the light oil recycling line 22 of the light oil recycling process; and flows from the feed line 4 to the LS process; It should be noted that the double control valve and the guide valve near the tank 8 in the process, the tank bottom pump 9, and the control valve at the front end of the outlet pipeline of the tank bottom pump 9 are closed;

[0040] In the cold feed process of the atmospheric column of the residue hydrocracking device unit c, the cold feed is from the cold low oil in the cold low pressure separation tank 11, through the diesel middle section reflux / cold low oil heat exchanger 12, warm high oil / cold low oil heat exchanger 13, the cold feed is mixed with the light oil flowing out of the above-mentioned feed line 4 to the LS process, and is mixed with the cold low oil through the hot low gas / cold low oil heat exchanger 14 and the HAGO product / cold low oil heat exchanger 15, and after being warmed up, they are all introduced into the fractionating atmospheric column 10, and are separated into naphtha, diesel and a small amount of wax oil in the fractionating atmospheric column 10.

[0041] In the above-mentioned outflow, the meeting point of the light oil recycling and the cold feed is in front of the hot low gas / cold low oil heat exchanger 14.

[0042] The scheme directly introduces the light oil originally recycled through the atmospheric and vacuum distillation device into the fractionating atmospheric column 10 of the residue hydrocracking device through the light oil recycling line 22, reduces the recycling process, and is more energy-saving and environmentally friendly; this recycling method reduces the load of the atmospheric and vacuum distillation device, and reduces the energy consumption of the whole plant, and the beneficial effects are specifically explained as follows:

[0043] 1. Increase the benefit of material:

[0044] Taking December 26, 2023 to January 13, 2024 as an example, the light oil recycling amount of the acid water stripping device light oil recycling technical transformation project is 2395t, the daily average recycling amount is 126t, the light oil recycling is stable at present, the naphtha, diesel and wax oil product quality is qualified, and the data is calculated according to this data:

[0045] Annual recycling amount = 126t*365 = 45990t

[0046] The low-value light oil 45990t is converted into high-value naphtha, diesel and wax oil, according to the light oil distillation range analysis, the proportion of each fraction is: naphtha 10%, diesel 80%, and wax oil 10%;

[0047] Naphtha production increase = 45990t*10% = 4599t

[0048] Diesel production increase = 45990t*80% = 36792t

[0049] Wax oil production increase = 45990t * 10% = 4599t

[0050] 2、Energy saving

[0051] Electricity saving = 37KW * 24h * 365 = 324120KWh

[0052] 3、Environmental emissions

[0053] After the use of this technical transformation, the light oil storage tank in the tank area does not need to be treated for odor, and the safety and environmental protection do not need to be treated.

[0054] In the description of the utility model, it is understood that 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 indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, structure and operation, and therefore cannot be understood as limiting the utility model.

[0055] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0056] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0057] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be the first and second features directly contact, or the first and second features indirectly contact through intermediate media. Moreover, the first feature is "on", "above" and "on" the second feature can be the first feature is directly above or obliquely above the second feature, or just indicates that the first feature is higher than the second feature in horizontal height. The first feature is "under", "below" and "under" the second feature can be the first feature is directly below or obliquely below the second feature, or just indicates that the first feature is less than the second feature in horizontal height.

[0058] It should be noted that when an element is referred to as being "on" or "set on" another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar expressions used herein are used for illustrative purposes only and are not intended to be the only implementation.

Claims

1. An ebullated bed residue hydrocracking fractionation light cycle oil recovery system characterized by, The application relates to a device for treating acid water, which comprises the following units: an acid water extraction unit, a tank area unit, a residual oil hydrocracking unit and a light sludge oil back-refining process; the acid water extraction unit comprises an acid water extraction unit sludge oil tank and a sludge oil tank production pump; the acid water extraction unit sludge oil tank in the acid water extraction unit is connected to the tank area unit through a production line connected to the sludge oil tank production pump; the tank area unit is connected to a crude oil distillation unit through a pipeline; the pipeline connected to the crude oil distillation unit is connected to the residual oil hydrocracking unit through a residual oil hydrocracking unit feed line; the light sludge oil back-refining process is drawn from the production line of the sludge oil tank production pump, introduced into the tank area unit and connected to the residual oil hydrocracking unit. The production line connected to the sludge oil tank production pump comprises a pump inlet line and a pump outlet line, and a pump outlet valve is arranged on the pump outlet line near the pump outlet position of the sludge oil tank production pump.

2. The ebullated bed residue hydrocracking fractionation light cycle oil recovery system of claim 1, wherein: The tank area unit comprises a tank area tank and a tank bottom pump; the pump outlet line of the production line in the acid water extraction unit is connected to the side wall of the tank area tank, and a double control valve and a guide valve are arranged near the tank area tank.

3. The ebullated bed residue hydrocracking fractionation light cycle oil recovery system of claim 2, wherein: The condensed oil in the acid water extraction unit sludge oil tank is obtained from solvent regeneration; one side of the bottom of the acid water extraction unit sludge oil tank is connected to the sludge oil tank production pump through a pump inlet line; the other side of the bottom of the acid water extraction unit sludge oil tank is further connected to an underground acid water tank through a pipeline and a control valve.

4. The ebullated bed residue hydrocracking fractionation light cycle oil recovery system of claim 1, wherein: The bottom of the tank area tank is connected to the tank bottom pump through a pipeline; the outlet pipeline of the tank bottom pump is connected to the pipeline leading to the crude oil distillation unit.

5. The ebullated bed residue hydrocracking fractionation light cycle oil recovery system of claim 3, wherein: The residual oil hydrocracking unit comprises a fractionation atmospheric tower, an atmospheric tower cold feed process, an LS process and a feed line connected to the LS process; the atmospheric tower cold feed process comprises a cold low-pressure separation tank, a reflux / cold low-oil heat exchanger, a warm high-oil / cold low-oil heat exchanger, a hot low-gas / cold low-oil heat exchanger and an HAGO product / cold low-oil heat exchanger; the bottom of the cold low-pressure separation tank is sequentially connected to the reflux / cold low-oil heat exchanger, the warm high-oil / cold low-oil heat exchanger, the hot low-gas / cold low-oil heat exchanger and the HAGO product / cold low-oil heat exchanger through pipelines, and communicates with the side wall of the fractionation atmospheric tower; the LS process is connected between the warm high-oil / cold low-oil heat exchanger and the hot low-gas / cold low-oil heat exchanger; the front end of the feed line is connected to the LS process.

6. The ebullated bed residue hydrocracking fractionation light cycle oil recovery system of claim 1, wherein: The LS process comprises an LS pipeline; a first control valve and a first blind plate are arranged on the LS pipeline near the warm high-oil / cold low-oil heat exchanger; a one-way valve, a second blind plate and a guide valve are arranged on the LS pipeline away from the first blind plate; the front end of the feed line is introduced into the guide valve and the first blind plate of the LS pipeline.

7. The ebullated bed residue hydrocracking fractionation light cycle oil recovery system of claim 6, wherein: One end of the pipeline connected to the crude oil distillation unit is connected to the crude oil distillation unit, and the other end of the pipeline is connected to the feed line of the residual oil hydrocracking unit.

8. The ebullated bed residue hydrocracking fractionation light cycle oil recovery system of claim 1, wherein: The light sludge oil back-refining process comprises a light sludge oil back-refining line and a double control valve and a guide valve arranged on the light sludge oil back-refining line; the light sludge oil back-refining line is drawn from the front end of the pump outlet valve of the sludge oil tank production pump and connected to the feed line of the residual oil hydrocracking unit.

9. The ebullated bed residue hydrocracking fractionation light cycle oil recovery system of claim 2, wherein: ​ 10. The ebullated bed residue hydrocracking fractionation light cycle oil recovery system of claim 6, wherein: The side wall of the atmospheric fractionating column is also provided with pipelines connected to diesel oil outlets, and the top of the atmospheric fractionating column is also provided with branch pipelines leading to acid gas to light hydrocarbon recovery and naphtha to light hydrocarbon recovery respectively.

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