CN1089642C - Magnetic separation method and device for catalytic cracking waste catalyst - Google Patents

Abstract

The invention relates to a method and a device for magnetically separating and recovering catalytic cracking waste catalyst. The magnetic separator consists of vertical separating ring and two main working units, the working surface of the separating ring is perpendicular to the plane of the exciting coil inside the magnet, the separating ring is divided into several magnetic separating chambers with magnetic conducting wire net, the waste catalyst is carried by compressed air to realize continuous magnetic separation, and the separating ring also adopts radial vibration mechanism to strengthen magnetic separation effect.

Description

Catalytic cracking spent catalyst magnetism separate method and device

The present invention relates to recycling to the refinery catalytic cracking spent catalyst.

In order to make full use of petroleum resources, the deep processing of oil such as the catalytic cracking process of heavy oil are the important process links.In catalytic cracking process, beavy metal impurities such as the contained vanadium of stock oil, nickel, iron can deposit to catalyst surface gradually, reduce activity of such catalysts and selectivity, thereby have reduced the yield and the performance of catalysate.For the property retention that makes catalyzer in the catalytic cracking unit in higher level, the general practice is both at home and abroad at present, regularly draws off the partial equilibrium agent from device, more additional part live catalyst in device.This way is proved effectively by long-term practice, but in fact also contains in some adding apparatus operation catalyzer soon from the spent catalyst that device draws off, and its use properties is also higher, and it is waste to expensive resource that this part is together thrown aside with useless agent.Useless agent has certain radioactivity needs buried underground disposal, the processing of useless agent in a large number, not only contaminate environment but also increase processing costs.Therefore, how to isolate useful composition from spent catalyst, be the key subjects that refinery is badly in need of solution always.

The catalyzer that is made of silicon, aluminium, zeolite does not have magnetic, but has polluted after the heavy metals such as iron, nickel, vanadium, can show certain magnetic under magnetic field.The heavy metal contamination degree is high more, the magnetic of catalyzer in magnetic field is just obvious more, therefore just can use magnetic separation technique, to give up agent by the different separated into two parts of magnetic, a part be in device working time long, metallic pollution degree seriously, catalytic activity and the lower magnetic agent of selectivity, another part be in device working time short, metallic pollution degree gently, the higher low magnetic agent of catalytic activity and selectivity or non magnetic dose, the latter uses in the return mechanism again.

Patent US43S9379 has announced the High-gradient Magnetic isolation technique of Japan National Oil Corporation, this technology is applied to process the fluidized catalytic cracker of distillation residue solvent-deasphalted oils or hydrogenating desulfurization oil, carrier can be selected air, hydrogen, water vapor and composition thereof for use, magneticstrength is 2000～20000 Gausses, and field gradient is (2000-20000) * 10 ³Gauss/cm ³, introduced isolating magnetic thing and can remove sedimentary metal by methods such as ion-exchange, chlorination, sulfuration, carbonylation, redox; Patent US519063S has set forth the influence to the magnetic separating effect of ferromegnetism and superparamagnetism; Introduce among the patent WO9219698, with spent catalyst grinding, size sorting, strengthen the magnetic separating effect, above-mentioned patent does not all relate to the type structure of magnetic separating technology and equipment.

The objective of the invention is to, propose a kind of catalytic cracking spent catalyst magnetism separate method and device, realize the recycling of useful part in the spent catalyst.

The catalytic cracking spent catalyst magnetism separate method that the present invention proposes is: adopt pressurized air as used catalyst support, the useless agent that draws off from catalytic cracking unit, through magnetic coarse strainer charging feedstock jar, through the feed controller regulation and control, constantly mix with pressurized air, send into the material feeder homogenizing in the magnetic separator, arrive the separation ring separate chamber in the magnetic field, isolate non magnetic dose; The pressurized air wind scoop is isolated neutral agent with weak magnetic-particle in the separate chamber in the magnetic field; The pressurized air wind scoop will break away from that magnetic-particle blows off in the separate chamber in magnetic field; The backwash wind scoop is removed residual particles in the separate chamber, dredges clear wire cloth; Carry the magnetic agent, non magnetic dose pressurized air enters gas-solid separator respectively and isolates solid particulate; The tail gas that produces is after the cleaner dedusting, and row is to atmosphere.

Device of the present invention mainly comprises magnetic separator and corollary apparatus; Corollary apparatus mainly include compressed air source, spent catalyst head tank, gas-solid separator, cleaner and holding tank and; Magnetic separator mainly includes separation ring and two groundwork unit of magnet and rectifier, water cooling plant, and separation ring is operated in the vertical plane, and the separation ring ring body is isolated into the plurality of separate chamber, overlaps in the separate chamber to place magnetic conduction and magnetic conductive metal silk screen not; Magnet by magnetic field and therein the magnetizing coil of horizontal positioned form, the circular channel that the inner formation of yoke is rotated for the sorting ring body, separation ring radially working face are completed a business transaction with the magnetizing coil plane is vertical, be provided with in the upper and lower yoke body of circular channel mutual isolated slide hopper and, magnet top is provided with spent catalyst material feeder and pressurized air wind scoop; The elastic support that the separation ring main shaft is made up of rubber spring is supported on the magnet, main shaft by buncher, belt transmission pay, speed reduction unit, shaft coupling drive, and make the speed of mainshaft adjustable; The other end of main shaft is equipped with excitation wheel.

Use magnetic separation technique of the present invention and equipment, the non magnetic dose of rate of recovery reaches more than 60%, in magneticstrength is under the 9000-11000 Gauss condition, the non magnetic dose of heavy metal content that reclaims is starkly lower than spent catalyst, its micro-activity improves 3 more than the unit, turn back in the catalyst-assembly consumption that can save live catalyst after using with non magnetic dose, reduced useless agent processing costs again simultaneously, have very remarkable economic efficiency and social benefit.

Provide embodiments of the invention below:

Accompanying drawing 1 is the magnetic separator structural front view.

Accompanying drawing 2 is magnetic separator structure side view.

Accompanying drawing 3 is the separation ring structural front view.

Accompanying drawing 4 is a separation ring structure side view.

Accompanying drawing 5 is the magnet perspective view.

Accompanying drawing 6 is a magnetic separation process scheme sketch.

Magnetic separator is made of separation ring 1,2 two groundwork unit of magnet.Separation ring is operated in the vertical plane, the elastic support 12 that its main shaft 3 is made up of spring rubber is supported on the magnet 2, separation ring main shaft 3 by motor 4, belt transmission pay 5, speed reduction unit and shaft coupling 7 drive, and make the speed of mainshaft adjustable, adopt buncher or change the transmitting ratio that belt transmission is paid as motor.The other end of main shaft 3 is equipped with excitation wheel 8 by bearing, and the eccentric block 9 of adjustable position is set on the excitation wheel; Pay in buncher 10 and belt transmission under 11 the driving, the excitation wheel rotation, make the sorting ring body produce radial vibration and change rotating speed and the vibrational frequency that the buncher rotating speed can be controlled separation ring, change the quality or the displacement of eccentric block, can control radially amplitude of sorting ring body.

Separation ring is a supporting plate with middle ring flat-plate 13, its both sides ring body 14 arranged side by side, if dividing plate 15 is separated into ring body in the separate chamber, interfolded magnetic conduction and magnetic conductive metal silk screen 16 not each separate chamber in, hold in the palm excellent 17 and pressure bar 18 wire cloth is fixed and clamped.The separate chamber is the isolating main place of magnetic, middle ring flat-plate center and main shaft 3 bindings.

Magnet 2 is the places that generate an electromagnetic field, and is material with the engineering pure iron, is combined by upper left yoke 19, upper right yoke 20, side yoke 21 and lower yoke 22.Horizontal positioned magnetizing coil 23 in the yoke body, coil section is rectangle or circle, intermediate throughholes provides flow passage for refrigerant.The effect of yoke is to form closed magnetic path, and prevents that magnetic line of force from leaking, and four yokes assemblies set as one, and bonding surface adopts pressure-resistant seal factory to prevent that spent catalyst from leaking; In magnet inside, magnetizing coil will be isolated fully with wind and catalyst channels, to guarantee that coil insulation is intact; The inner circular channel 24 of rotating that forms of yoke for the sorting ring body, the circular channel is positioned at magnetizing coil, and working face is completed a business transaction with the magnetizing coil plane is vertical, be provided with isolated mutually two groups of slide hoppers in the yoke body of the upper and lower of circular channel 24, they are respectively non-magnetic particle slide hopper 25 and weak magnetic-particle slide hopper 26.Hood 27 and main shaft and magnet 2 upper surface pressure-resistant seals.Magnetic separator is also disposed to magnetizing coil and is provided powerful galvanic rectifier 29 and to magnetizing coil, single coil excitement refrigerative water-circulating cooling device 28.

Fig. 6 has provided magnetic separation process scheme sketch.Compressed air source 30 is carried used catalyst support wind and technology wind by under meter 31 and the magnetic separator of blast tube alignment, the useless agent that draws off from catalytic cracking unit is earlier through the magnetic coarse strainer, charging feedstock jar 32 behind filtering ferromagnetism particle and the large size impurity, via valve 33, feed controller 34 regulation and control, constantly mix with pressurized air, send into material feeder 35 homogenizing in the magnetic separator, arrive the separation ring separate chamber in the magnetic field, magnetic-particle be adsorbed in magnetic wire cloth 16, non-magnetic particle separates through slipping hopper 2S; Simultaneously, weak magnetic-particle separates through slide hopper 26 as neutral agent under 36 effects of pressurized air wind scoop; Wind scoop 37 will break away from the indoor magnetic-particle of magnetic field separation and blow off; The pressurized air of backwash wind scoop 38 oppositely is blown into the separate chamber, removes residual particles mediation wire cloth, is in clean state when guaranteeing to accept spent catalyst next time.Carrying isolating magnetic-particle or non-magnetic particle from the pressurized air of magnetic separator output enters gas-solid separator 39 respectively and isolates solid formulation; and take in magnetic agent holding tank 41 and non magnetic dose of holding tank 40 respectively; intermediate agent can be incorporated in non magnetic dose or the magnetic agent according to arts demand or service requirements; carry a little solid particulate secretly from the gas-solid separator tail gas discharged, row is to atmosphere after cleaner 42 is further removed.

At catalyzer for different metal content, its separating effect and non magnetic dose of yield and processing parameters such as magneticstrength, separation ring rotating speed, vibrational frequency, compressed air require and useless agent treatment capacity are in close relations, the present invention has adopted the measure of can regulating in above-mentioned link, so that test obtains best effect.

Claims (4)

1, a catalytic cracking spent catalyst magnetic separation method is characterized in that: adopt compressed air as spent catalyst carrier, the waste agent discharged from catalytic cracking unit is packed into raw material tank through magnetic rough screen, passes through feed controller ( 34) Controlling, constantly mixing with compressed air, feeding into the feeder (35) in the magnetic separator for homogenization, reaching the sorting ring separation chamber in the magnetic field, and separating the non-magnetic agent; the compressed air wind bucket (36) will The neutral agent is separated from the weak magnetic particles in the separation chamber in the magnetic field; the compressed air bucket (37) blows away the magnetic particles in the separation chamber that have escaped from the magnetic field; the backwash wind bucket (38) removes the residual particles in the separation chamber and clears the wire mesh; The compressed air carrying the magnetic agent and the non-magnetic agent respectively enters the gas-solid separator (39) to separate solid particles; the generated tail gas is discharged to the atmosphere after being dedusted by the purifier (42). 2. A device for realizing the magnetic separation method of catalytic cracking waste catalyst according to claim 1, characterized in that it mainly includes a magnetic separator and supporting devices; the supporting devices mainly include a compressed air source (30), waste catalyst raw materials tank (32), gas-solid separator (39), purifier (42) and collection tanks (40) and (41); the magnetic separator mainly includes two main tasks of a sorting ring (1) and a magnet (2) The unit and the rectifier (29), the water cooling device (28), the sorting ring (1) work in the vertical plane, the sorting ring body is isolated into several separation chambers, and the magnetic and non-magnetic metal wires are overlapped in the separation chambers The net (16); the magnet (2) is made up of a magnetic field and an excitation coil (23) placed horizontally therein, and an annular channel (24) for the rotation of the sorting ring is formed inside the yoke, the radial working plane of the sorting ring and the excitation coil The coil plane is vertically delivered, the upper and lower magnetic yoke bodies of the annular channel (24) are provided with mutually isolated chute (25) and (26), and the spent catalyst feeder (35) and compression valve are provided above the magnet (2). Air wind bucket; the sorting ring main shaft (3) is supported on the magnet (2) by an elastic support (12) composed of rubber springs, and the main shaft (3) is composed of a speed-regulating motor (4), a belt drive (5), a reducer (6), shaft coupling (7) drive, and make the main shaft rotating speed adjustable; The other end of main shaft (3) is equipped with exciting wheel (8). 3. The device according to claim 2, characterized in that: the excitation wheel (8) installed on the main shaft of the sorting ring of the magnetic separator is provided with an adjustable eccentric block (9), the excitation wheel (8) Driven by a speed-regulating motor (10) and a belt drive pair (11). 4. The device according to claim 2, characterized in that: the sorting ring (2) of the magnetic separator uses the middle ring plate (1 3) as the support plate, the ring bodies (1 4) are arranged side by side, and the separator (15 ) isolates the ring body into several separation chambers, the wire mesh (16) in the chamber is fixed and compressed by the support rod (17) and the pressure rod (18), and the center sleeve of the middle ring plate is bonded to the main shaft (3).

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