Oil slurry filtering device with two-stage filtration for catalytic cracking device

A catalytic cracking unit and secondary filtration technology, applied in the direction of filtration separation, filtration loop, gravity filter, etc., can solve the problems of high cost, short continuous operation period, and the filtration system cannot meet the basic requirements, so as to save costs and work. Time extension, the effect of prolonging the continuous operation time

Inactive Publication Date: 2011-08-17
王丹宁 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of two-stage filtration catalytic cracking unit external oil slurry filter device, which solves the problem that the existing filter device cannot continuously operate for a short perio

Method used

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  • Oil slurry filtering device with two-stage filtration for catalytic cracking device
  • Oil slurry filtering device with two-stage filtration for catalytic cracking device
  • Oil slurry filtering device with two-stage filtration for catalytic cracking device

Examples

Experimental program
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Effect test

Embodiment 1

[0021] see figure 1 and figure 2 , the present invention's two-stage filtering catalytic cracking unit external oil slurry filtering device includes a series first-stage filter and a second-stage filter, the first-stage filter is one or two filters 1, and the second-stage Filtration is at least two filters 2; the filter element used in the filter 1 of the first stage filtration is a wedge-shaped wire wound filter element 11, and the wedge-shaped wire wound filter element 11 is composed of a wedge-shaped metal wire winding, and each circle of wire According to the size distribution of the solid catalyst particles in the oil slurry, select an appropriate size for the gap between the adjacent metal wires, the range is 10-50 microns, and the options are 10 microns, 15 microns, 20 microns, 25 microns, and 30 microns , 35 microns, 40 microns, 45 microns or 50 microns and other different sizes, and is a continuous funnel shape; the filter 2 of the second-stage filtration uses a met...

Embodiment 2

[0023] Embodiment 2: the operation process embodiment of primary filter

[0024]The primary filter starts working when the filter to be protected is about to be backwashed off-line. The oil slurry enters the filter from the bottom of the filter 1, and the oil slurry flows out from the filtrate outlet 13 of the filter by wrapping the outside of the filter core 11 by a wedge-shaped wire under the action of pressure. Most of the solid catalyst particles will form a filter cake on the outer surface of the wedge wire wound filter element 11 . Filtration online cycle time can be set. When the predetermined filter cake is formed, the pre-filter stops working, and the filter cake is cleaned with recycled oil. When the first stage filter 1 completes the backwashing and starts working again, the oil slurry will first pass through the first stage filter 1 to intercept the asphaltene and particles that cannot penetrate the filter cake on the first stage filter 1, some of which are small...

Embodiment 3

[0025] Embodiment 3: Secondary filter operation process embodiment

[0026] The filtration process occurs when the oil slurry (from under the tube sheet) flows into the filter and passes through the metal powder sintered filter element 3 . Solids (catalyst powder) are trapped outside the surface of the filter element to form a filter cake due to their size larger than the pore size. The clean oil slurry flows through the filter cake layer, passes through the metal powder sintered filter element 3, and flows out of the filter as clean filtered oil.

[0027] During the filtration process, the filter cake will gradually thicken and the flow resistance will gradually increase. The set flow rate is maintained by increasing the pressure difference between the inner and outer walls of the filter element. In this way, the filtration continues until the final filter element pressure difference reaches the set value or reaches the set maximum filtration time, then the filter must be b...

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PUM

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Abstract

The invention relates to an oil slurry filtering device with two-stage filtration for a catalytic cracking device, which is characterized by comprising first-stage filtration and second-stage filtration connected in series, wherein the first-stage filtration comprises one filter or two filters, and the second-stage filtration comprises at least two filters; a filter element adopted by each filter in the first-stage filtration is the filter element wound by a wedge-shaped metal wire, each filter element wound by the wedge-shaped metal wire is wound by the wedge-shaped metal wire, and a gap between each ring of the metal wire and the adjacent metal wire is fixed and in the shape of a continuous funnel; and the filter element sintered by metal powder is adopted for each filter of the second-stage filtration. The device has the advantages that by adopting the oil slurry filtering device with the two-stage filtration for the catalytic cracking device, a filtering system can be operated and continuously used for 2 years, and then offline cleaning is further performed. The continuous operation time of the filters is greatly prolonged, the cost is saved, the requirement on continuous operation of the heavy oil catalytic cracking device is ensured, and the practicality is strong.

Description

technical field [0001] The invention relates to the field of petroleum equipment, in particular to the field of oil slurry filtration for catalytic cracking units in oil refineries, in particular to a secondary filtering device for filtering oil slurry for catalytic cracking units. Background technique [0002] The oil slurry thrown out of the catalytic cracking unit is the tailings that cannot be cracked during the production process in the catalytic cracking unit of the refinery, and is discharged from the device in the form of "outward dumping". Since the catalytic cracking unit adopts a fluidized bed reaction, the external oil slurry inevitably contains solid catalyst powder (main components: Al2O3, SiO2), and the solid content is 3000-20000ppm. [0003] At present, in general, there are only two methods of sedimentation and filtration in terms of solid treatment of externally flung oil slurry. For the use of filtration technology, the filtration system with backwash fu...

Claims

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Application Information

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IPC IPC(8): B01D36/02B01D29/48B01D29/31
Inventor 周旭王丹宁
Owner 王丹宁
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