CN2169473Y

CN2169473Y - Catalyst cracking lift tube burning regenerator

Info

Publication number: CN2169473Y
Application number: CN 93242428
Authority: CN
Inventors: 杨启业; 金涌; 胡伯光; 周婉华; 魏飞; 张仁伟; 张蓉生; 甘俊; 卢时述; 黄荣臻; 俞芷青
Original assignee: BEIJING DESIGN INST CHINA PETR; Beijing Union Yinghua Engineering Institute; CHANGLING OIL REFINING CHEMICA; China Petrochemical Corp
Current assignee: BEIJING DESIGN INST CHINA PETR; Beijing Union Yinghua Engineering Institute; CHANGLING OIL REFINING CHEMICA; China Petrochemical Corp
Priority date: 1993-10-22
Filing date: 1993-10-22
Publication date: 1994-06-22
Anticipated expiration: 2003-10-22

Abstract

The utility model relates to a strengthened scorching regenerator for a catalytic cracking lift pipe. The utility model is characterized in that a multistage air inlet is arranged on the lift pipe regenerator, the scorching regeneration of deactivated catalyst is carried out under the condition that air input of each stage and catalyst circulation ratios can be adjusted, the process of the scorching regeneration of the deactivated catalyst is strengthened, the operating flexibility and stability of a regenerative device can be enhanced, and an abnormal flameout phenomenon can be prevented from generating in the regeneration process. The lift pipe regenerator has the advantages of simple structure and convenient operation, the utility model is suitable for a cyclic regeneration system of easily deactivated catalyst in the field of petroleum industry and chemical industry, and is especially suitable for catalytic cracking devices for heavy oil or resid.

Description

Catalyst cracking lift tube burning regenerator

The utility model belongs to the catalyzer coke burning regeneration device of catalytic cracking.

Fluid catalytic cracking be have very high economic benefit petroleum refining process, it is low that one of key of current techniques development will be developed a kind of regenerated catalyst carbon content that can make exactly, to keep the activity of molecular sieve catalyst, can increase substantially the revivifier simple in structure that burns intensity again.

Since the seventies, domestic and international various intensifying regenerating technology constantly develop, and wherein are on the one hand to adopt high temperature, hyperoxia, high gas speed to strengthen on technology to burn technology, as burn pot type revivifier etc.; Be to improve traditional catalyst to mix the type fluid bed regenerator entirely on the other hand, to adapt to the operational condition of high-temperature regenerated catalyst, as adopting two-stage regeneration device etc.It is high 1～2 times that these revivifiers burn strength ratio conventional regeneration device, but its structure and operate all more complicated.Burn intensity in order further to improve, simplified apparatus structure and operation adapt to the development of heavy oil fluid catalytic cracking technology, have developed full pipeline abroad and have burnt technology generation for the conventional regeneration technology.

Promoting the tubular type revivifier is to replace dense bed in recent years to burn and burn a jar full pipeline regenerating unit of strengthening empyreumatic a kind of advanced person, is applicable to the cyclic regeneration of easy decaying catalyst, is one of key equipment of heavy oil catalytically cracking equipment.This equipment and the supporting use of circulation fast fluidized bed reactor, granules of catalyst circulates between reactor and revivifier, repeatedly the alternately experience reaction and two processes of regenerating.The quality of revivifier design is related to the activity of catalyst in reactor, directly has influence on the whole structure of catalytic cracking process.

The catalytic cracking riser coke burning regeneration device that the present invention relates to, when inactivation reclaimable catalyst carbon content is higher, because it is big to burn reaction heat effect, the temperature of reaction height, may the Yin Wendu superelevation and makes the catalyzer hydrothermal deactivation in the revivifier exit, and the revivifier ingress may cause temperature low excessively because of a large amount of cold air introducings, causes " stopping working " phenomenon to take place; If air inlet implication speed is low excessively, then the oxygen supply deficiency is made and burn reaction not exclusively, be difficult to reach the requirement of regenerated catalyst carbon content.This shows, exist contradiction between two main operating parameters of operating gas velocity and temperature of reaction in the riser regenerator, existing riser tube coke burning regeneration device, owing to adopt one section axial admission, thereby be difficult to reasonably red-tape operati gas speed and temperature of reaction, and this promotes the key that the tubular type revivifier successfully turns round just.

The purpose of the utility model catalytic cracking riser coke burning regeneration device just is by adopting the empyreumatic mode of multistage air inlet, regeneration air reasonably distributes, thereby reasonably red-tape operati gas speed and temperature of reaction, in the solution the problem of operational condition harshness, make and burn reaction and can under high catalyst at inlet concentration, high temperature in and efficient gas-solid contact condition, carry out, reach and strengthen the coke burning regeneration reaction, improve the positive effect of device stability.

For achieving the above object, the utility model catalytic cracking riser coke burning regeneration device is by the riser regenerator main body, cyclonic separator, gas-solid quick disconnector and catalyst recirculation system form, its principal feature is to be provided with the multistage inlet mouth on general riser tube main body, and each section inlet mouth adopts same structure, can adopt radially, also can adopt cutting orientation structure and riser regenerator main body to connect; Air inlet hop count and inlet mouth position can determine as required that the segmented openings number of general inlet mouth is 1～5, and the height location of each section inlet mouth is along the high uniform distribution of bed of riser regenerator main body; Ratio between each section air input can be regulated by processing requirement, and the coke burning regeneration that makes decaying catalyst carries out under than adjustable situation in each section air input and catalyst recirculation.

Owing to adopt above-mentioned riser tube coke burning regeneration device structure that can the multistage air inlet, required regeneration air total amount can be divided into several portions, be divided in the several times difference access arrangement along the revivifier axial height, the air input at bottom inlet place thereby obviously minimizing can prevent that introducing the flame-out phenomenon that causes temperature to reduce because of a large amount of freezing airs takes place.And, owing to reduced entrance gas speed, having improved the entrance catalyst concn, remaining air then is distributed at the riser tube different heights, can remedy required oxygen level.This shows that the riser regenerator of this structure is red-tape operati gas speed and temperature of reaction reasonably, under the prerequisite that guarantees the good contact of gas-solid, is the efficient apparatus that improves catalyst inlet concentration and bottom inlet temperature.

Below in conjunction with accompanying drawing the utility model catalytic cracking riser coke burning regeneration device is done to describe in further detail.

Fig. 1 is a catalytic cracking riser coke burning regeneration device structure iron

Fig. 2 is tangential admission mouth structure figure

As shown in Figure 1, this catalytic cracking riser coke burning regeneration device rises device main body 1 again by riser tube, cyclonic separator 2, regeneration air inlet 3, compositions such as blast pipe 9, gas outlet 4, gas-solid quick disconnector 5, catalyzer outer circulating tube 6, inclined tube to be generated 7 and regenerator sloped tube 8, riser regenerator main body 1 is provided with multistage regeneration air inlet mouth 3, and each section inlet mouth 3 adopts same structure, available radial, and also available cutting orientation structure and riser regenerator main body 1 connect.

Adopt when tangential structure as shown in Figure 2, the inlet gas speed control is built in about 10～20 meter per seconds.The tangential gas of introducing can make the interior gas-solid two-phase of revivifier be in the eddy flow state, helps to improve the homogeneity between the gas-solid two-phase, helps burning.The raising of tangential velocity can strengthen the interior gas-solid biphase of revivifier and rotatablely move, but under high intake velocity, therefore the wearing and tearing meeting of revivifier wall increases, so generally should gas speed be chosen in the above-mentioned optimum range according to processing requirement.

Riser tube coke burning regeneration device air inlet hop count and inlet mouth position can be determined as required, the segmented openings number of general inlet mouth 3 is 1～5, the height location of each section air inlet openings 3 is along the bed height uniform distribution of riser regenerator main body 1, and the ratio between each section air input can be regulated by processing requirement; If during by three sections designs, one section inlet mouth position is between 0～5 meter of the height of bed, two sections inlet mouth positions are between 8～13 meters of the height of bed, and three sections inlet mouth positions are between 15～23 meters of the height of bed.

Experiment shows, under the same operation condition, compare with one section air inlet, when adopting three sections air inlets, with the original total amount that should enter air of revivifier, reasonably be distributed in 1,2,3 section and be distributed into respectively, reduced a wind inlet of regenerator bottoms, bed bottom voidage is obviously reduced, can guarantee the efficient gas-solid contact under high catalyst concentration in the revivifier; Simultaneously,, avoided too much because of once introducing the freezing air amount owing to after adopting three sections air inlets, reduced an air output of regenerator bottoms, the excessive and reduction bottom inlet place temperature of gas speed, thus can realize operating under the high temperature in.

The utility model burns owing to having accomplished to strengthen under high granule density, high temperature in, efficient gas-solid contact, has improved the performance and the stability of riser tube coke burning regeneration device greatly, has prevented that " stopping working " reaches " hydrothermal deactivation " phenomenon and produce, and effect is remarkable; Simultaneously, because regeneration rear catalyst active increase, help catalytic cracking unit and further reach and raise the efficiency and purpose such as quality product.

The utility model revivifier does not use internals, and is simple in structure, easy to operate, is easy to realize in full scale plant, is applicable to the cyclic regeneration system of easy decaying catalyst in oil and the chemical field, is specially adapted to the catalytic cracking process device of heavy oil or residual oil.

Claims

1, a kind of catalytic cracking riser coke burning regeneration device, form by riser regenerator main body, cyclonic separator, gas-solid quick disconnector and catalyst recirculation system, it is characterized in that riser regenerator main body (1) is provided with multistage inlet mouth (3), and each section inlet mouth (3) adopts same structure, available radial, also available cutting orientation structure and riser regenerator main body (1) connect.

2, according to the described catalytic cracking riser coke burning regeneration of claim 1 device, its characteristic is that the segmented openings number of multistage inlet mouth (3) is 1～5.

3, according to claim 1 or 2 described catalytic cracking riser coke burning regeneration devices, its characteristic is the bed height uniform distribution of the height location of each section inlet mouth (3) along riser regenerator master (1).

4, according to the described catalytic cracking riser coke burning regeneration of claim 3 device, its characteristic is, when multistage inlet mouth (3) designs by three sections air inlets, one section inlet mouth position is between 0～5 meter of the height of bed, two sections inlet mouth positions are between 8～13 meters of the height of bed, and three sections inlet mouth positions are between 15～23 meters of the height of bed.