Catalytic cracking product purification device

Abstract

The utility model belongs to the technical field of high-temperature catalytic cracking, and relates to a catalytic cracking product purification device, which comprises a first purification unit, a second purification unit, a third purification unit and a fourth purification unit, the second purification unit comprises a second filter, and an inlet of the second purification unit is connected with an intermediate tank and a second pressure difference display; when the pressure difference value of the first pressure difference display is smaller than a set value, a product containing coke powder enters the first purification unit from the delivery storage tank; when the pressure difference value is greater than a set value, the delivery storage tank is communicated with the intermediate tank, and a product containing coke powder enters the second purification unit from the delivery storage tank and the intermediate tank. The device has the advantages that coke generated on the surface of a reaction catalyst can be purified, and the coke is prevented from entering the product tank.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-temperature catalytic cracking, and in particular relates to a catalytic cracking product purification device. Background Art

[0002] At present, several representative olefin catalytic cracking units in the world all use fixed bed reactors. When the raw materials are catalytically cracked at high temperature to produce the target products ethylene and propylene, alkanes, aromatics and even coke will inevitably be produced, which will reduce the selectivity and yield of the target products. Among them, the main factors affecting the formation of coke are reaction temperature, reaction pressure and reaction time. Especially at high temperature, olefins are very easy to coke on the catalyst surface.

[0003] However, when the reactor is regenerated, the coke cannot be completely removed. At the same time, the coke is mainly concentrated in the regeneration nitrogen compressor inlet buffer tank, the compressor inlet buffer tank, and the mixed heavy olefin delivery process. The adverse effects on the device are: first, the product contains carbon powder, the product is unqualified, and quality accidents occur; second, it accumulates in the cooler pipe layer, the temperature of the pipe layer rises after cooling, and the energy consumption of circulating water is increased; third, it affects the operation of the oil and gas recovery device in the storage tank.

[0004] In view of the above problems, how to deal with the coke produced by high-temperature catalytic cracking has become an issue that needs to be urgently addressed. Utility Model Content

[0005] The utility model provides a catalytic cracking product purification device, which can purify the coke generated on the surface of the reaction catalyst and prevent the coke from entering the product tank.

[0006] The technical solution of the utility model includes: a catalytic cracking product purification device, including: a first purification unit, the first purification unit includes a first filter, the inlet of the first filter is connected to an external delivery tank, and the first filter is connected to a first pressure difference display; a second purification unit, the second purification unit includes a second filter, the inlet of the second filter is connected to an intermediate tank, and the second filter is connected to a second pressure difference display; when the pressure difference value of the first pressure difference display is less than a set value, the product containing coke powder enters the first purification unit from the external delivery tank; when the pressure difference value of the first pressure difference display is greater than the set value, the external delivery tank is connected to the intermediate tank, and the product containing coke powder enters the second purification unit from the external delivery tank and the intermediate tank.

[0007] Preferably, the first purification unit is provided with a first cleaning device, which includes a first bypass valve connected in parallel with the first filter, and a first backwash valve connected to the inlet of the first filter.

[0008] Preferably, the second purification unit is provided with a second cleaning device, which includes a second bypass valve connected in parallel with the second filter, and a second backwash valve connected to the inlet of the second filter.

[0009] Preferably, the inlet of the first filter is connected to a first front hand valve, the outlet of the first filter is connected to a first rear hand valve, and when the pressure difference value of the first pressure difference display is greater than the set value, the first front hand valve and the first rear hand valve are switched from open to closed.

[0010] Preferably, the inlet of the second filter is connected to a second front hand valve, the outlet of the second filter is connected to a second rear hand valve, and when the pressure difference value of the second pressure difference display is greater than the set value, the second front hand valve and the second rear hand valve are switched from open to closed.

[0011] Preferably, an external delivery pump is provided on the pipeline connecting the external delivery tank and the first filter, and an intermediate pump is provided on the pipeline connecting the intermediate tank and the second filter.

[0012] Preferably, a filter element is provided in the first filter, and the size of the filter element is adapted to the particle size of the coke powder contained in the product.

[0013] The beneficial effects of the utility model are as follows: by designing a purification unit, specifically by utilizing a filter in the purification unit, the coke in the product containing coke powder is purified, and the coke in the product is purified by utilizing the filter to avoid the coke being put into subsequent product tanks, thereby preventing the product from being unqualified; at the same time, in order to avoid the filter's purification capacity of the coke being reduced over time during the purification process, a first purification unit and a second purification unit are designed, and a first filter and a second filter are designed respectively. At the same time, a first pressure difference indicator and a second pressure difference indicator are designed, and the pressure value displayed by the first pressure difference indicator is utilized to monitor the coke purification capacity of the first filter. Once the pressure difference value of the first pressure difference indicator is greater than the set value, the second purification unit is used to purify the product containing coke powder to ensure the quality of the purification process of the coke. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0015] Figure 1 is a schematic diagram of an embodiment.

[0016] in:

[0017] 1. First filter, 11. First front hand valve, 12. First rear hand valve, 13. First pouring valve, 2. First bypass valve, 3. First differential pressure display, 4. Second filter, 41. Second front hand valve, 42. Second rear hand valve, 43. Second pouring valve, 5. Second bypass valve, 6. Second differential pressure display;

[0018] 100. External delivery tank, 101. External delivery pump, 200. Intermediate tank, 201. Intermediate pump. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] In this article, the terms "upper, lower, left, right, inside, outside" and the like are established based on the positional relationships shown in the drawings. Depending on the different drawings, the corresponding positional relationships may also change accordingly. Therefore, they cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components. In addition, in the embodiments of the present utility model, "above", "below", etc., include the number itself.

[0021] Reference Figure 1 The catalytic cracking product purification device of this embodiment includes: a first purification unit, the first purification unit includes a first filter 1, and the inlet of the first filter 1 is connected to an external storage tank 100, so that the product containing coke powder enters the first purification unit from the external storage tank 100, and the coke is purified to prevent the coke from entering the product tank with the product, thereby ensuring the product quality.

[0022] Furthermore, the first filter 1 is connected to a first differential pressure display 3, and the differential pressure of the first filter 1 is monitored by the first differential pressure display 3, and then the purification processing capacity of the first filter 1 is judged by the differential pressure value. Specifically, when the differential pressure value monitored by the first differential pressure display 3 is low, it means that the differential pressure before and after the first filter 1 is small, and then it can be inferred that the amount of purified coke accumulated in the first filter 1 is small, that is, the first filter 1 has a good purification processing capacity for coke; on the contrary, if the differential pressure value of the first differential pressure display 3 is high, it means that the amount of coke accumulated in the first filter 1 is large, and its purification processing capacity for coke is poor.

[0023] The second purification unit includes a second filter 4, the inlet of the second filter 4 is connected to the intermediate tank 200, and the second filter 4 is connected to a second pressure difference display 6. Similar to the first purification unit, the second pressure difference display 6 is used to monitor the pressure difference before and after the second filter 4, and then judge the coke purification capacity of the second filter 4 according to the monitored pressure difference value.

[0024] Among them, when the pressure difference value of the first pressure difference display 3 is less than the set value, specifically, the set value can be set according to the type of the first filter 1 and the quality requirements for the product, and this embodiment does not limit it here. At this time, it means that the first filter 1 has a good purification ability for coke, and the product containing coke powder enters the first purification unit from the external storage tank 100, and the first filter 1 is used to purify the coke in the product. If the pressure difference value of the first pressure difference display 3 is greater than the set value, it means that the first filter 1 has a poor purification ability for coke, and the external storage tank 100 is connected to the intermediate tank 200, and the product containing coke powder enters the second purification unit from the external storage tank 100 and the intermediate tank 200, and the second filter 4 of the second purification unit is used to purify the coke in the product.

[0025] In this embodiment, a purification unit is designed, specifically, a filter in the purification unit is used to purify the coke in the product containing coke powder, and the filter is used to purify the coke in the product to avoid the coke being put into subsequent product tanks, which may cause the product to be unqualified. At the same time, in order to avoid the purification capacity of the filter to purify the coke decreases over time during the purification process, a first purification unit and a second purification unit are designed, and a first filter 1 and a second filter 4 are designed respectively. At the same time, a first pressure difference indicator 3 and a second pressure difference indicator 6 are designed, and the pressure value displayed by the first pressure difference indicator 3 is used to monitor the coke purification capacity of the first filter 1. Once the pressure difference value of the first pressure difference indicator 3 is greater than the set value, the second purification unit is used to purify the product containing coke powder to ensure the quality of the purification process of the coke.

[0026] In the specific implementation of this embodiment, the first purification unit is provided with a first cleaning device, which includes a first bypass valve 2 connected in parallel with the first filter 1, and a first backwash valve 13 connected to the inlet of the first filter 1. Once the pressure difference value displayed by the first pressure difference display 3 is greater than the set value, the first bypass valve 2 and the first backwash valve 13 are opened, and the flushing medium enters the first filter 1 through the first backwash valve 13 to flush the coke powder accumulated therein, and the flushed liquid is discharged to the outside through the first bypass valve 2. In this way, the first cleaning device can be used to realize the regeneration and reuse of the first purification unit, which is energy-saving and efficient.

[0027] Similarly, the second purification unit is provided with a second cleaning device, which includes a second bypass valve 5 connected in parallel with the second filter 4, and a second backwash valve 43 connected to the inlet of the second filter 4. The principle of the second cleaning device is similar to that of the first cleaning device and will not be repeated.

[0028] Reference Figure 1 The inlet of the first filter 1 is connected with the first front hand valve 11, and the outlet of the first filter 1 is connected with the first rear hand valve 12. When the first purification unit is used to purify the coke of the product, the first front hand valve 11 and the first rear hand valve 12 are in an open state, so that the product passes through the first front hand valve 11 and enters the first filter 1. After the coke purification treatment is completed in the first filter 1, the product without coke is discharged from the first rear hand valve 12 to the product tank. When the pressure difference value of the first pressure difference display 3 is greater than the set value, the first front hand valve 11 and the first rear hand valve 12 are switched from open to closed. At this time, the coke purification of the product is processed by the second purification unit, and the first filter 1 enters the cleaning. The closing of the first front hand valve 11 and the first rear hand valve 12 can also prevent the waste liquid in the cleaning from entering the product tank, so as to improve the reliability of product quality.

[0029] Similarly, the inlet of the second filter 4 is connected to the second front hand valve 41, and the outlet of the second filter 4 is connected to the second rear hand valve 42. When the second filter 4 is used to purify the coke, the second front hand valve 41 and the second rear hand valve 42 are in the open state; when the pressure difference value of the second pressure difference display 6 is greater than the set value, the second filter 4 enters the cleaning state, and the second front hand valve 41 and the second rear hand valve 42 are switched from the open state to the closed state.

[0030] A delivery pump 101 is provided on the pipeline connecting the delivery storage tank 100 and the first filter 1, and the product containing coke powder is supplied to the first filter 1 by means of the delivery pump 101. An intermediate pump 201 is provided on the pipeline connecting the intermediate tank 200 and the second filter 4, and the product containing coke powder from the delivery storage tank 100 is supplied to the second filter 4 by means of the intermediate pump 201 to purify the coke.

[0031] Specifically, a filter element is provided in the first filter 1, and the size of the filter element is adapted to the particle size of the coke powder contained in the product, that is, different filter elements can be selected according to the particle size of the coke powder contained in the product to improve the purification effect of the coke. Similarly, a filter element can also be designed in the second filter 4, and the size of the filter element can also be adjusted according to the particle size of the coke powder in the product.

[0032] The catalytic cracking product purification device of this embodiment is mainly used in actual applications as a device for cracking and producing target products using a fixed bed reactor under high temperature conditions. It can purify the coke generated on the surface of the reaction catalyst, prevent the coke from entering the product tank, avoid quality accidents, and at the same time reduce the operation and maintenance costs of the device.

[0033] In the case where the embodiments are not contradictory, at least part of the technical solutions in the embodiments can be recombined to form the substantial technical solution of the utility model. Of course, the embodiments can also be referenced or included in each other. In addition, it should be noted that the adaptive adjustments and modifications made by those skilled in the art when recombining the technical means recorded in the embodiments will also fall within the protection scope of the utility model.

[0034] The technical principle of the present invention is described above in combination with specific implementations, but it should be noted that the above descriptions are only for explaining the principle of the present invention and cannot be interpreted in any way as a specific limitation on the protection scope of the present invention. Based on the explanation here, technicians in this field can think of other specific implementations or equivalent replacements of the present invention without creative work, and they will fall within the protection scope of the present invention.

Claims

1. A catalytic cracking product purification device, characterized in that: include: A first purification unit, the first purification unit comprising a first filter (1), the inlet of the first filter (1) being connected to an external storage tank (100), and the first filter (1) being connected to a first differential pressure display (3); a second purification unit, the second purification unit comprising a second filter (4), an inlet of the second filter (4) being connected to an intermediate tank (200), and the second filter (4) being connected to a second differential pressure display (6); When the pressure difference value of the first pressure difference display (3) is less than a set value, the product containing coke powder enters the first purification unit from the external delivery tank (100); when the pressure difference value of the first pressure difference display (3) is greater than the set value, the external delivery tank (100) is connected to the intermediate tank (200), and the product containing coke powder enters the second purification unit from the external delivery tank (100) and the intermediate tank (200).

2. A catalytic cracking product purification device according to claim 1, characterized in that: The first purification unit is provided with a first cleaning device, which comprises a first bypass valve (2) connected in parallel with the first filter (1), and a first backwash valve (13) connected to the inlet of the first filter (1).

3. A catalytic cracking product purification device according to claim 2, characterized in that: The second purification unit is provided with a second cleaning device, which comprises a second bypass valve (5) connected in parallel with the second filter (4), and a second backwash valve (43) connected to the inlet of the second filter (4).

4. A catalytic cracking product purification device according to claim 1 or 2, characterized in that: The inlet of the first filter (1) is connected to a first front hand valve (11), and the outlet of the first filter (1) is connected to a first rear hand valve (12). When the pressure difference value of the first pressure difference display (3) is greater than a set value, the first front hand valve (11) and the first rear hand valve (12) are switched from an open state to a closed state.

5. A catalytic cracking product purification device according to claim 4, characterized in that: The inlet of the second filter (4) is connected to a second front hand valve (41), and the outlet of the second filter (4) is connected to a second rear hand valve (42). When the pressure difference value of the second pressure difference display (6) is greater than a set value, the second front hand valve (41) and the second rear hand valve (42) are switched from an open state to a closed state.

6. A catalytic cracking product purification device according to claim 1, characterized in that: An external delivery pump (101) is provided on the pipeline connecting the external delivery storage tank (100) and the first filter (1), and an intermediate pump (201) is provided on the pipeline connecting the intermediate tank (200) and the second filter (4).

7. A catalytic cracking product purification device according to claim 1, characterized in that: The first filter (1) is provided with a filter element, the size of which is adapted to the particle size of the coke powder contained in the product.

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