Treatment system for fluidized bed residual oil hydrocracking unit fractionating tower coking

Abstract

The utility model relates to the technical field of chemical engineering, in particular to a fluidized bed residual oil hydrocracking device fractionating tower coking treatment system which comprises a fractionating tower, an atmospheric tower hot feeding line, a fractionating tower outlet line, an atmospheric wax oil circulation line, a circulation branch line, a diesel oil extraction line and an inlet steam line which are connected to the atmospheric wax oil circulation line, a normal-pressure wax oil collecting tank is arranged in the fractionating tower; a hot feeding line of the atmospheric tower is connected to an inlet of the fractionating tower; one end of the fractionating tower outlet line is connected with an outlet of the fractionating tower, the other end of the fractionating tower outlet line is connected with an inlet of the normal-pressure wax oil stripping tower, a tower inlet valve is arranged on the fractionating tower outlet line, a first bypass pipeline is arranged on the tower inlet valve, and a valve group is arranged on the first bypass pipeline. A normal-pressure wax oil collecting tank of a fractionating tower is forwards or reversely cleaned by introducing a diesel oil extraction line, and the normal-pressure wax oil collecting tank of the fractionating tower can be reversely cleaned by introducing an inlet steam line, so that the problem of coking and blockage of the normal-pressure wax oil collecting tank is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chemical industry technical field, concretely is a kind of boiling bed residual oil hydrocracking unit fractionating column coking's processing system. BACKGROUND

[0002] With petroleum resources more and more scarce, the processing proportion of heavy crude oil will be more and more big, so the selection of heavy oil processing scheme influences the economic benefit of whole plant even destiny. Boiling bed residual oil hydrocracking technology has the technical advantages such as high residual oil conversion rate, small environmental pollution, high investment return rate, will be widely used, but in the reaction process, boiling bed residual oil hydrocracking technology destroys the stability of residual oil raw material, leading to asphaltene in oil product in fractionating system easy to precipitate, in turn lead to equipment, pipeline coking, limit the running cycle of all residual oil hydrocracking unit, influence the economic benefit of whole plant or shorten the running cycle of unit. Therefore, solve the easy coking problem of fractionating system, can guarantee the key of " safe, stable, long, full, excellent " operation of unit.

[0003] Since boiling bed residual oil hydrocracking process is developed and put into production, seeking the target or optimized operation interval of unit becomes the important content of boiling bed residual oil hydrocracking process. Lower reaction temperature and operation severity will not easily lead to coking phenomenon, but this low conversion rate will reduce the operation economy of unit. Mainly from fractionating column bottom temperature, column bottom residence time, the use of scale inhibitor, change equipment structure, equipment internal plating film etc. a series of researches are carried out, and the research results are also widely used in industrial unit, reach to extend the running cycle of fractionating system. UTILITY MODEL CONTENT

[0004] In view of the defects of prior art, the utility model provides a kind of boiling bed residual oil hydrocracking unit fractionating column coking's processing system, it passes through the introduction extraction diesel line positive or reverse cleaning fractionating column's atmospheric gas oil collecting tank, also can introduce inlet steam line reverse cleaning fractionating column's atmospheric gas oil collecting tank, alleviate atmospheric gas oil collecting tank coking blockage problem.

[0005] To achieve the above object, the utility model provides a technical scheme for a boiling bed residual oil hydrocracking device fractionating tower coking treatment system, characterized by comprising a fractionating tower, atmospheric tower hot feed line, fractionating tower outlet line, atmospheric wax oil circulation line, circulating branch line, extracted diesel oil line and inlet steam line, which are connected to the atmospheric wax oil circulation line, the fractionating tower is internally provided with an atmospheric wax oil collecting tank, the atmospheric tower hot feed line is connected to the inlet of the fractionating tower, one end of the fractionating tower outlet line is connected to the outlet of the fractionating tower, and the other end is connected to the inlet of the atmospheric wax oil stripping tower, a tower inlet valve is arranged on the fractionating tower outlet line, a first bypass pipeline is arranged on the tower inlet valve, and the first bypass pipeline is provided with a valve group, one end of the atmospheric wax oil circulation line is connected to the fractionating tower outlet line, and the other end is connected to the atmospheric wax oil collecting tank, a pump inlet valve, atmospheric wax oil extraction pump and cold reflux heat exchanger are sequentially arranged on the atmospheric wax oil circulation line, one end of the circulating branch line is connected to the atmospheric wax oil circulation line, and the other end is connected to the atmospheric wax oil collecting tank, the extracted diesel oil line is connected to the atmospheric wax oil circulation line, and the inlet steam line is connected to the atmospheric wax oil circulation line.

[0006] Further, a power valve is arranged on the upstream of the pump inlet valve, a pump outlet valve is arranged between the cold reflux heat exchanger and the atmospheric wax oil extraction pump.

[0007] Further, the extracted diesel oil line is connected between the atmospheric wax oil extraction pump and the pump outlet valve, the pump inlet valve, valve group and tower inlet valve are closed, and the atmospheric wax oil collecting tank is flushed in the positive direction by the extracted diesel oil line.

[0008] Further, the atmospheric wax oil circulation line is provided with a cross line, one end of the cross line is connected between the pump outlet valve and the cold reflux heat exchanger, and the other end is connected between the pump inlet valve and the power valve.

[0009] Further, the extracted diesel oil line is connected between the atmospheric wax oil extraction pump and the pump outlet valve, the pump inlet valve, valve group, diaphragm valve and tower inlet valve are closed, and the atmospheric wax oil collecting tank is flushed in the reverse direction by the extracted diesel oil.

[0010] Further, the inlet steam line is connected between the power valve and the pump inlet valve, the pump inlet valve, valve group and tower inlet valve are closed, and the atmospheric wax oil collecting tank is flushed in the reverse direction by the inlet steam line.

[0011] Further, a filter valve is arranged on the upstream of the tower inlet valve, the filter valve is provided with a second bypass pipeline, the second bypass pipeline is provided with a filter, and valves are arranged in front of and behind the filter.

[0012] Further, the circulating branch line is provided with a diaphragm valve.

[0013] Further, a guide valve is arranged on the valve group.

[0014] The beneficial effects of the present application are as follows: the coke in the fractionation atmospheric pressure wax oil collecting tank and other places can be decomposed by the forward and reverse flushing of the diesel oil extracted from the fractionating column, the operation cycle of the device is prolonged, the maintenance of the atmospheric pressure column is saved, 1600 tons of flushing diesel oil, 3800 tons of wax oil, 1600 tons of light sludge oil, 3800 tons of heavy sludge oil, 428,000 of standby vacuum back-frying sludge oil energy consumption, and 1,850,000 of labor and materials are consumed in one maintenance, and 229.8 million yuan can be saved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The process flow chart of the embodiment of the present application is shown in the figure.

[0016] Figure 2 The process flow chart of the preferred embodiment of the present application is shown in the figure.

[0017] In the figure: 100, fractionating column, 110, atmospheric pressure wax oil collecting tank,

[0018] 200, fractionating column outlet line, 210, column inlet valve, 220, filter valve, 230, first bypass pipeline, 231, valve group, 240, second bypass pipeline, 241, filter,

[0019] 300, atmospheric pressure wax oil circulating line, 310, power valve, 320, pump inlet valve, 330, atmospheric pressure wax oil extraction pump, 340, pump outlet valve, 350, cold reflux heat exchanger,

[0020] 400, circulating branch line, 410, diaphragm valve,

[0021] 500, extracted diesel oil line,

[0022] 600, inlet steam line,

[0023] 700, atmospheric pressure column hot feed line,

[0024] 800, atmospheric pressure wax oil stripping column,

[0025] 900, cross line. DETAILED DESCRIPTION

[0026] In order to make the above objectives, features and advantages of the present application more obvious 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, so the present application is not limited to the specific embodiments disclosed below.

[0027] As shown in Figure 1 The present application discloses a kind of boiling bed residual oil hydrocracking device fractionating tower coking processing system of an embodiment in the present application, including fractionating tower 100, atmospheric tower hot feed line 700, fractionating tower outlet line 200, atmospheric wax oil circulation line 300, circulation branch line 400, extracted diesel oil line 500 and inlet steam line 600;Fractionating tower 100 inside is provided with atmospheric wax oil oil collecting tank 110;Atmospheric tower hot feed line 700 is connected to the inlet of fractionating tower;Fractionating tower outlet line 200 one end is connected with the outlet of fractionating tower 100, the other end is connected with the inlet of atmospheric wax oil stripping tower 800, and tower inlet valve 210 is arranged on fractionating tower outlet line 200, first bypass pipeline 230 is arranged on tower inlet valve 210, and valve group 231 is arranged on first bypass pipeline 230;Atmospheric wax oil circulation line 300 one end is connected to fractionating tower outlet line 200, the other end is connected to atmospheric wax oil oil collecting tank 110, and atmospheric wax oil circulation line 300 is sequentially provided with pump inlet valve 320, atmospheric wax oil extraction pump 330 and cold reflux heat exchanger 350;Circulation branch line 400 one end is connected to atmospheric wax oil circulation line 300, the other end is connected to atmospheric wax oil oil collecting tank 110;Extracted diesel oil line 500 is connected to atmospheric wax oil circulation line 300;Inlet steam line 600 is connected to atmospheric wax oil circulation line 300.

[0028] In an embodiment, power valve 310 is arranged on the upstream of pump inlet valve 320, and pump outlet valve 340 is arranged between cold reflux heat exchanger 350 and atmospheric wax oil extraction pump 330.

[0029] In an embodiment, extracted diesel oil line 500 is connected between atmospheric wax oil extraction pump 330 and pump outlet valve 340, pump inlet valve 320, valve group 231 and tower inlet valve 210 are closed, and diesel oil is introduced through extracted diesel oil line 500 to flush atmospheric wax oil oil collecting tank 110 in a positive direction.

[0030] It should be noted that the extracted diesel oil from fractionating tower atmospheric line is introduced to the outlet of atmospheric wax oil extraction pump 330 through extracted diesel oil line 500, and then flushed to atmospheric wax oil oil collecting tank 110 through hot return and cold return.

[0031] In one embodiment, the inlet steam line 600 is connected between the power valve 310 and the pump inlet valve 320. The pump inlet valve 320, valve group 231 and tower inlet valve 210 are closed, and steam is drawn through the inlet steam line 600 to flush the atmospheric pressure wax oil collection tank 110 in reverse.

[0032] It should be noted that steam is introduced upstream of the atmospheric pressure wax oil extraction pump 330 through the inlet steam line 600 and backwashed to the atmospheric pressure wax oil collection tank 110.

[0033] In one embodiment, a filter valve 220 is provided upstream of the tower inlet valve 210, the filter valve 220 is provided with a second bypass line 240, the second bypass line 240 is provided with a filter 241, and valves are provided before and after the filter 241.

[0034] In one embodiment, the circulation branch line 400 is provided with a diaphragm valve 410.

[0035] Furthermore, a drain valve is installed on valve assembly 231.

[0036] In the above-mentioned coking treatment system of the fractionation tower of a fluidized bed residue hydrocracking unit, the pump inlet valve 320, valve group 231 and tower inlet valve 210 are closed. High-temperature diesel at 200°C is drawn from the fractionation tower atmospheric line through the diesel extraction line 500 to flush the atmospheric wax oil collection tank 110 in the forward direction. Then, steam is introduced in the reverse direction through the inlet steam line 600 for secondary flushing.

[0037] like Figure 2 As shown, in a preferred embodiment, the atmospheric pressure wax oil circulation line 300 is provided with a crossover line 900, one end of which is connected between the pump outlet valve 340 and the cold reflux heat exchanger 350, and the other end is connected between the pump inlet valve 320 and the power valve 310.

[0038] In the preferred technical solution, the diesel fuel extraction line 500 is connected between the atmospheric pressure wax oil extraction pump 330 and the pump outlet valve 340. The pump inlet valve 320, valve group 231, diaphragm valve 410 and tower inlet valve 210 are closed. The diesel fuel is extracted and used to flush the atmospheric pressure wax oil collection tank 110 in reverse.

[0039] It should be noted that the diesel fuel extracted from the distillation tower via the diesel fuel extraction line 500 is led from the diesel pump drain to the outlet of the atmospheric pressure wax oil extraction pump 330, and then backwashed to the atmospheric pressure wax oil collection tank 110.

[0040] In the above-mentioned coking treatment system of the fractionation tower of a fluidized bed residue hydrocracking unit, the pump inlet valve 320, valve group 231 and tower inlet valve 210 are closed. High-temperature diesel at 200°C is drawn out from the diesel extraction line 500 to the atmospheric pressure wax oil collection tank 110 in reverse to flush it. Then, steam is introduced through the inlet steam line 600 for secondary flushing in reverse.

[0041] It needs to be explained that the present application provides a treatment system for coking of a boiling bed residual oil hydrocracking device fractionating tower, which is characterized by introducing the fractionating tower normal line extracted diesel oil to forward and reverse flush high pressure wax oil collecting tank, and then using steam flushing, so that the coking matter at the fractionating normal pressure wax oil collecting tank 110 and other places can be decomposed, the operation cycle of the device is prolonged, and the method is as follows: the high temperature diesel oil extracted from the fractionating tower normal line is introduced from the extraction pump blowdown to the normal pressure wax oil extraction pump 330 outlet, the solubility of the diesel oil is used to reverse flush the normal pressure wax oil collecting tank 110 or forward flush the normal pressure wax oil collecting tank 110 through cold and hot reflux, and finally steam flushing is used to achieve the purpose of coke removal of the normal pressure wax oil collecting tank 110.

[0042] In the description of the present application, it should be understood that the orientation or positional relationship 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 is based on the orientation or positional relationship shown in the drawings, and is 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 indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] 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 as "first" and "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.

[0044] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, 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 or interaction relationship of two elements, unless otherwise specifically limited. For ordinary skilled persons in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact 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 herein are for illustrative purposes only and are not the only embodiment.

Claims

1. A system for treating a coking event in a boiling bed residue hydrocracking unit fractionator, the system comprising: a coking event detection system; a coking event mitigation system; and a coking event recovery system. comprising a fractionating column, inside which an atmospheric wax oil collecting tank is arranged; an atmospheric column hot feed line connected to the inlet of the fractionating column; a fractionating column outlet line, one end of which is connected to the outlet of the fractionating column and the other end of which is connected to the inlet of the atmospheric wax oil stripping column, a column inlet valve being arranged on the fractionating column outlet line, a first bypass line being arranged on the column inlet valve, the first bypass line being provided with a valve group; an atmospheric wax oil circulation line, one end of which is connected to the fractionating column outlet line and the other end of which is connected to the atmospheric wax oil collecting tank, the atmospheric wax oil circulation line being provided in sequence with a pump inlet valve, an atmospheric wax oil extraction pump and a cold reflux heat exchanger; a circulation branch line, one end of which is connected to the atmospheric wax oil circulation line and the other end of which is connected to the atmospheric wax oil collecting tank; an extracted diesel oil line connected to the atmospheric wax oil circulation line; an inlet steam line connected to the atmospheric wax oil circulation line.

2. A system for treating a coking event in a boiling bed residue hydrocracking unit fractionator according to claim 1, characterized in that: A power valve is arranged upstream of the pump inlet valve, and a pump outlet valve is arranged between the cold reflux heat exchanger and the atmospheric wax oil extraction pump.

3. A system for treating a coking event in a boiling bed residue hydrocracking apparatus fractionation column according to claim 2, characterized in that: The extracted diesel oil line is connected between the atmospheric wax oil extraction pump and the pump outlet valve, the pump inlet valve, the valve group and the column inlet valve are closed, and the atmospheric wax oil collecting tank is flushed in the forward direction by diesel oil through the extracted diesel oil line.

4. A system for treating a coking event in a boiling bed residue hydrocracking apparatus fractionation column according to claim 2, characterized in that: The atmospheric wax oil circulation line is provided with a cross line, one end of which is connected between the pump outlet valve and the cold reflux heat exchanger and the other end of which is connected between the pump inlet valve and the power valve.

5. A system for treating a coking event in a boiling bed residue hydrocracking apparatus fractionation column according to claim 4, characterized in that: The extracted diesel oil line is connected between the atmospheric wax oil extraction pump and the pump outlet valve, the pump inlet valve, the valve group, the diaphragm valve and the column inlet valve are closed, and the atmospheric wax oil collecting tank is flushed in the reverse direction by diesel oil through the extracted diesel oil line.

6. A system for treating a coking event in a boiling bed residue hydrocracking unit fractionator according to claim 1, characterized in that: The inlet steam line is connected between the power valve and the pump inlet valve, the pump inlet valve, the valve group and the column inlet valve are closed, and the atmospheric wax oil collecting tank is flushed in the reverse direction by steam through the inlet steam line.

7. A system for treating a coking event in a boiling bed residue hydrocracking apparatus fractionation column according to claim 1, characterized in that: A filter valve is arranged upstream of the column inlet valve, the filter valve is provided with a second bypass line, a filter is arranged on the second bypass line, and valves are arranged before and after the filter.

8. A system for treating a coking event in a boiling bed residue hydrocracking apparatus fractionation column according to claim 1, characterized in that: The circulation branch line is provided with a diaphragm valve.

9. A system for treating a coking event in a fluid bed residue hydrocracking unit fractionation column according to claim 1, wherein: A pilot valve is arranged on the valve group.

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