Waste catalyst conversion mechanism in catalytic cracking

Abstract

The utility model belongs to the technical field of petrochemical engineering, and particularly relates to a waste catalyst conversion mechanism in catalytic cracking. The waste catalyst recycling device comprises a waste catalyst recycling tank, a waste catalyst tank, a valve group and a pore plate, and the waste catalyst recovery tank is communicated with the waste catalyst tank through the valve group and the pore plate in sequence. The agent transfer device is very smooth in the agent transfer process. The throttling flow is controlled by using the pore plate, so that the service life of the agent conversion control valve is effectively prolonged, the repair and maintenance cost is saved, and the inner leakage accident and the unplanned shutdown caused by the abrasion and leakage of the valve plate of the agent conversion control valve are avoided. The control pore plate can utilize an old stainless steel blind cover, so that the function of the control pore plate can be well realized, waste recycling is realized, and the cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of petrochemical engineering, and particularly relates to a waste catalyst transfer mechanism in catalytic cracking. Background Art

[0002] The 1.8 million tons / year catalytic cracking unit of a refinery was designed by a certain design institute and was successfully put into production on June 22, 2011. The unit uses the residue provided by the atmospheric distillation unit of the refinery as raw material, adopts the MIP gasoline olefin reduction process developed by the Petroleum Science Academy, and has a production plan of producing more high-octane gasoline.

[0003] The three-stage cyclone separator of the 1.8 million tons / year catalytic cracking unit is used to further recover the waste catalyst in the catalytic cracking regenerated flue gas to ensure the service life of the blades of the gas turbine. The waste catalyst recovered by the three-stage cyclone separator is collected into the waste catalyst tank, and the waste catalyst in the waste catalyst tank is transported to the catalyst recovery tank through the transfer line. To transfer the waste catalyst, the catalyst recovery tank needs to be evacuated, and the transfer speed is controlled by the opening degree of the transfer control valve. When the opening degree of the transfer control valve is small, the transfer speed is slow, resulting in waste of resources; when the opening degree of the transfer control valve is large, the transfer speed is fast, and the transfer pipeline is prone to blockage; when the opening degree of the transfer control valve is 30%, it is beneficial to the transfer of waste catalyst, but the transfer control is severely worn, and 2 transfer control valves are lost per month. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides a waste catalyst transfer mechanism in catalytic cracking.

[0005] To achieve the above object, the technical solution adopted by the utility model is:

[0006] A waste catalyst transfer mechanism in catalytic cracking, comprising a waste catalyst recovery tank, a waste catalyst tank, a transfer control valve group, a control orifice plate and a connecting pipeline; the waste catalyst recovery tank is connected to the waste catalyst tank through the connecting pipeline via a valve group and the control orifice plate in sequence.

[0007] The control orifice plate is detachably connected to the port at the output end of the valve group.

[0008] The control orifice plate is a circular stainless steel plate, and a central through hole is opened at the center position; a plurality of connecting holes are arranged in a circular array around the control orifice plate.

[0009] The outer diameter of the control orifice plate is larger than the outer diameter of the connecting pipeline; the diameter of the central through hole is smaller than the inner diameter of the connecting pipeline.

[0010] The diameter of the central through hole is 35 - 45 mm.

[0011] The control orifice plate is made of a used stainless steel blind cover.

[0012] The catalyst transfer control valve group includes a first control valve, a second control valve, and a third control valve; the first control valve, the second control valve, and the third control valve are sequentially connected between the waste catalyst recovery tank and the control orifice plate; the output end port of the third control valve is connected with the control orifice plate.

[0013] Beneficial effects:

[0014] (1) The utility model is composed of a waste catalyst recovery tank, a waste catalyst tank, a valve group, and an orifice plate. The utility model is very smooth during the catalyst transfer process, and avoids the occurrence of internal leakage accidents and unplanned shutdowns caused by wear and leakage of the valve plate of the catalyst transfer control valve.

[0015] (2) The control orifice plate in the utility model can utilize an old stainless steel blind cover to achieve the reuse of waste.

[0016] (3) The utility model effectively extends the service life of the catalyst transfer control valve, and saves the costs of maintenance, repair, and upkeep.

[0017] The above description is only an overview of the technical solution of the utility model. In order to understand the technical means of the utility model more clearly and implement it according to the content of the description, the following describes the preferred embodiments of the utility model in detail in conjunction with the accompanying drawings. Brief description of the drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following briefly introduces the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the composition of the present utility model.

[0020] Figure 2 It is a schematic diagram of the structure of the orifice plate in the present utility model.

[0021] In the figure: 1. Waste catalyst recovery tank; 2. Waste catalyst tank; 3. First control valve; 4. Second control valve; 5. Third control valve; 6. Control orifice plate; 7. Central through hole; 8. Connection hole. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] Embodiment 1:

[0024] According to Figure 1 and Figure 2 A spent catalyst conversion mechanism in catalytic cracking is shown, which includes a spent catalyst recovery tank 1, a spent catalyst tank 2, a conversion control valve group, a control orifice plate 6, and a connecting pipeline; the spent catalyst recovery tank 1 is sequentially connected to the spent catalyst tank 2 through the connecting pipeline via a valve group and the control orifice plate 6.

[0025] Furthermore, the control orifice plate 6 is detachably connected to the port at the output end of the valve group.

[0026] During the actual conversion process, fully open the last valve in the conversion control valve group, connect a control orifice plate 6 behind the last valve, and control the conversion speed within the required range, which can greatly reduce the wear of the spent catalyst conversion control valve. When the control orifice plate 6 is severely worn, directly replace the control orifice plate 6, which saves costs and extends the service life of the conversion control valve. It not only saves the costs of repair, maintenance, and servicing, but also avoids the occurrence of internal leakage accidents and unplanned shutdowns caused by wear and leakage of the conversion control valve plate.

[0027] Since the replacement of the control orifice plate 6 is much easier than the replacement of the valve, it can be completed within a relatively short shutdown time, with less impact on production.

[0028] Embodiment 2:

[0029] According to Figure 1 and Figure 2 A spent catalyst conversion mechanism in catalytic cracking is shown, which is different from Embodiment 1 in that: the control orifice plate 6 is a circular stainless steel plate, and a central through hole 7 is opened at its central position; a plurality of connecting holes 8 are circularly arranged around the control orifice plate 6.

[0030] Furthermore, the outer diameter of the control orifice plate 6 is larger than the outer diameter of the connecting pipeline; the diameter of the central through hole 7 is smaller than the inner diameter of the connecting pipeline.

[0031] Furthermore, the diameter of the central through hole 7 is 35 - 45 mm.

[0032] The control orifice plate 6 forms a stable pressure difference by restricting the fluid cross-sectional area, keeping the catalyst transfer speed within a reasonable range, and preventing the valve from being worn due to frequent opening adjustment.

[0033] In actual use, the present utility model uses the opening of the control orifice plate 6 to replace the catalyst transfer speed control valve, greatly reducing the wear of the spent catalyst transfer control valve, thereby prolonging the service life of the spent catalyst transfer control valve.

[0034] Embodiment Three:

[0035] According to Figure 1 and Figure 2 A spent catalyst transfer mechanism in catalytic cracking shown, the difference from Embodiment One is that the control orifice plate 6 is made of a used stainless steel blind cover.

[0036] In actual use, the control orifice plate 6 made of a used stainless steel blind cover not only realizes the function of the control orifice plate 6 but also saves costs and realizes waste reuse.

[0037] Embodiment Four:

[0038] According to Figure 1 A spent catalyst transfer mechanism in catalytic cracking shown, the difference from Embodiment One is that the catalyst transfer control valve group includes a first control valve 3, a second control valve 4, and a third control valve 5; the first control valve 3, the second control valve 4, and the third control valve 5 are sequentially connected between the spent catalyst recovery tank 1 and the control orifice plate 6; the output end port of the third control valve 5 is connected to the control orifice plate 6.

[0039] During the actual spent catalyst transfer process, the spent catalyst severely wears the transfer control valve. If only one transfer control valve is set, once the control valve is worn, it will cause the leakage of the spent catalyst, resulting in the unplanned shutdown of the catalytic unit. In this embodiment, three control valves are set, which is convenient for replacing the worn transfer control valve and avoiding the unplanned shutdown of the catalytic unit.

[0040] Specifically, under normal production and operation conditions, the first control valve 3 and the second control valve 4 are fully open, and the third control valve 5 is closed. During the spent catalyst transfer process, only the third control valve 5 is opened and closed. Therefore, the third control valve 5 is severely worn and needs to be frequently replaced; the function of the second control valve 4 is to cut off the spent catalyst material to facilitate the replacement of the third control valve 5; but after the second control valve 4 is opened and closed multiple times, the second control valve 4 will also be worn. The function of the first control valve 3 is to cut off the spent catalyst material to facilitate the replacement of the second control valve 4; through the above three transfer control valves, the transfer control valve can meet the long-term operation of the catalytic unit.

[0041] Embodiment Five:

[0042] According toFigure 1 and Figure 2 A waste catalyst conversion mechanism in catalytic cracking as shown, which is different from the first embodiment in that: the outer diameter of the control orifice plate 6 is larger than the outer diameter of the connecting pipe; the diameter of the central through hole 7 is smaller than the inner diameter of the connecting pipe; the diameter of the central through hole 7 is 40 mm; the control orifice plate 6 is made of a waste stainless steel blind cover; the conversion control valve group includes a first control valve 3, a second control valve 4 and a third control valve 5; the first control valve 3, the second control valve 4 and the third control valve 5 are sequentially connected between the waste catalyst recovery tank 1 and the control orifice plate 6; the output end port of the third control valve 5 is connected with the control orifice plate 6.

[0043] During actual use, the control orifice plate 6 is connected to the output end port of the third control valve 5. During the conversion process, the third control valve 5 is fully opened, greatly reducing the wear of the waste catalyst conversion control valve. After calculation and testing, adding a control orifice plate 6 with a diameter of Φ40 mm behind the third control valve can just control the conversion speed within the required range. If the control orifice plate 6 is severely worn, this control orifice plate 6 can be directly replaced.

[0044] The design of the control orifice plate 6 of the present utility model not only ensures the smooth progress of the conversion process, but also extends the service life of the conversion control valve, saves the costs of repair, maintenance and upkeep, and avoids the occurrence of wear and leakage accidents of the conversion control valve. The control orifice plate 6 utilizes an old stainless steel blind cover, realizing the reuse of waste.

[0045] Example six:

[0046] The practical application of a waste catalyst conversion mechanism in catalytic cracking.

[0047] The waste catalyst conversion mechanism in catalytic cracking is applied to a 1.8 million tons / year catalytic cracking unit. Before application, 24 control valves were lost every year. After using the present utility model, 2 control valves are lost every year. The price of each control valve is about 50,000 yuan, and more than 1.1 million yuan can be saved.

[0048] Without conflict, those skilled in the art can combine the relevant technical features in the above examples according to the actual situation to achieve the corresponding technical effects. The specific combination situations are not elaborated one by one here.

[0049] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, then the directional indication also changes accordingly.

[0050] In addition, the descriptions involving "first", "second", etc. in the present utility model are for descriptive purposes only, and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0051] As described above, these are merely the preferred embodiments of the present utility model. The present utility model will not be limited to these embodiments shown herein, but rather should conform to the broadest scope consistent with the principles and novel features disclosed herein. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solutions of the present utility model.

Claims

1. A waste catalyst conversion mechanism in catalytic cracking, characterized in that: The invention comprises a waste catalyst recovery tank (1), a waste catalyst tank (2), a catalyst conversion control valve group, a control orifice plate (6) and a connecting pipe; the waste catalyst recovery tank (1) is connected to the waste catalyst tank (2) via the connecting pipe, the valve group and the control orifice plate (6) in sequence.

2. A catalytic cracking waste catalyst conversion mechanism as claimed in claim 1, characterized in that: The control orifice plate (6) is detachably connected to a port at the output end of the valve group.

3. A catalytic cracking waste catalyst conversion mechanism as claimed in claim 1 or 2, characterized in that: The control orifice plate (6) is a circular stainless steel plate, with a central through hole (7) at its center; a plurality of connection holes (8) are formed in a circular array around the control orifice plate (6).

4. A catalytic cracking waste catalyst conversion mechanism as claimed in claim 3, characterized in that: The outer diameter of the control orifice plate (6) is larger than the outer diameter of the connecting pipe; and the diameter of the central through hole (7) is smaller than the inner diameter of the connecting pipe.

5. A catalytic cracking waste catalyst conversion mechanism as claimed in claim 4, characterized in that: The diameter of the central through hole (7) is 35-45 mm.

6. A catalytic cracking waste catalyst conversion mechanism as claimed in claim 1 or 2, characterized in that: The control orifice plate (6) is made of a waste stainless steel blind cover.

7. A catalytic cracking waste catalyst conversion mechanism as claimed in claim 1, characterized in that: The catalyst conversion control valve group comprises a first control valve (3), a second control valve (4) and a third control valve (5); the first control valve (3), the second control valve (4) and the third control valve (5) are connected in sequence between a waste catalyst recovery tank (1) and a control orifice plate (6); and the output port of the third control valve (5) is connected to the control orifice plate (6).

Images