CN202039032U

CN202039032U - Propylene production device by using heavy oil

Info

Publication number: CN202039032U
Application number: CN2010205972134U
Authority: CN
Inventors: 丁洪春; 丛森滋; 李胜山; 刘艳苹; 张国磊
Original assignee: CNPC East China Survey Design & Research Institute
Current assignee: CNPC EastChina Design Institute Co Ltd; CNPC East China Survey Design & Research Institute
Priority date: 2010-11-04
Filing date: 2010-11-04
Publication date: 2011-11-16
Anticipated expiration: 2020-11-04

Abstract

The utility model relates to a propylene production device by heavy oil catalytic pyrolysis; the lower end of a first section of a riser reactor is connected with the upper part of a first section of a raising pipe conveying bed reaction riser, and the upper part of the first section of the riser reactor is connected with a precipitator; the middle of the first section of the raising pipe conveying bed reaction riser is connected with a regenerator through a first section of a regenerated inclined pipe; the lower part of a second section of the riser reactor is connected with a second section of the raising pipe conveying bed reaction riser, and the upper part of the second section of the riser reactor is connected with the precipitator; the middle of the second section of the raising pipe conveying bed reaction riser is connected with the regenerator through a second section of the regenerated inclined pipe; the regenerated inclined pipe is connected with the lower part of a steam stripping section and a charring tank; the lower part of the precipitator is connected with the steam striping section; and an external circulating pipe is connected with the regenerator and the charring tank. The device can improve the yield of propylene, and can give consideration to the light oil yield while improving the quality of light oil.

Description

A kind of heavy oil is produced propylene unit

Technical field

The utility model relates to a kind ofly produces propylene unit with heavy oil catalytic pyrolysis.

Background technology

At present, the technology of the propylene of the heavy oil catalytic pyrolysis of exploitation production both at home and abroad is based on conventional catalytic cracking process more, adopts the catalyzer or the auxiliary agent of the shape-selective molecular sieve that contains different ratios, selects the operational condition of high temperature, high agent-oil ratio for use.Concrete process form comprises: realize producing more propylene by selection appropriate catalyst and adjustment operational condition on conventional catalytic cracking unit; Certain position freshening petroleum naphtha (comprising light hydrocarbons such as C4 to C8) in conventional FCC riser; Carry out the petroleum naphtha freshening to single riser reactor transformation and in the riser tube bottom; On conventional catalytic cracking unit, increase the fluidized-bed reactor freshening petroleum naphtha of a riser tube or other patterns in addition.

According to the literature, patent CN1279270, CA2186744, CN1237477, CN1031834, US4980053, US3928172, CN1069054 and US6569316 described respectively various can increased low carbon olefine output, improve quality of gasoline, and improve the production technology that the reaction conditions of heavy oil feed and product distribute, but these to be the Technology of raw material producing more propylene with heavy oil mainly can be divided into two big classes:

(1) one class is based on conventional catalytic cracking process, the form of single riser reactor is transformed, and carried out the freshening of catalytic cracking petroleum naphtha or other light hydrocarbons in a certain way.The productivity of propylene of this class technology is general all below 10%, and productivity of propylene too Gao Shihui causes dry gas and coke yield obviously to increase, the quality rapid deterioration of light-end products, especially diesel oil.

(2) another kind of is to be on the basis at conventional catalytic cracking process, increases the fluidized-bed reactor of a riser tube or other patterns in addition, freshening petroleum naphtha or other light hydrocarbons under harsh operational condition.This class technology propylene also is difficult to greater than 15% with respect to the productive rate of heavy oil feed, otherwise faces dry gas equally and coke yield obviously increases, the problem of the quality rapid deterioration of light-end products, especially diesel oil.

The utility model content

The purpose of this utility model provide a kind of with the mink cell focus be the productivity of propylene of raw material higher, when taking into account the lightweight oil productive rate, can guarantee the production equipment of the quality of light-end products again, this device has reaction conditions mitigation, less investment, low power consumption and other advantages.

Heavy oil described in the utility model is produced propylene unit, by outer circulating tube, two sections riser tubes carry a bed reaction lifter, two sections regenerator sloped tubes, burn jar, inclined tube to be generated, stripping stage, one section riser tube carry a bed reaction lifter, one section regenerator sloped tube, one section riser reactor, settling vessel, revivifier and two sections riser reactors to constitute: one section riser reactor lower end and one section riser tube are carried and bed are reacted lifter top and be connected, and top is connected with settling vessel; One section riser tube carries bed reaction lifter middle part to be connected with revivifier by one section regenerator sloped tube; Two sections riser reactor bottoms carry bed reaction lifter to be connected with two sections riser tubes, and top is connected with settling vessel; Two sections riser tubes carry bed reaction lifter middle part to be connected with revivifier by two sections regenerator sloped tubes; Inclined tube to be generated connects the stripping stage bottom and burns jar; The settling vessel bottom is connected with stripping stage; Outer circulating tube connects revivifier and burns jar.

Stock oil and mixed c 4 enter first section riser tube and carry bed reaction lifter; Stock oil and mixed c 4 are controlled at certain mixing temperature and certain reaction time; Turning oil and petroleum naphtha enter second section riser tube and carry bed reaction lifter; Turning oil and petroleum naphtha are controlled at certain mixing temperature and certain reaction time; After carrying the reacted oil gas of bed reaction lifter to mix through thick cyclonic separators, one section and two sections riser tubes enter the top cyclonic separator together; Reaction oil gas enters separation column through gas pipeline after further isolating the catalyzer of carrying secretly through the top cyclonic separator.

The reclaimable catalyst of first section reaction and second section reaction generation falls into the stripping stage of settling vessel bottom, after displacing the oil gas that adsorbs on the granules of catalyst, behind the descending process of reclaimable catalyst inclined tube to be generated, the guiding valve to be generated, enter and burn pot bottom, coke in burning jar on the catalyzer and the reaction of airborne oxygen, the carbon of the hydrogen that burning-off is whole and the overwhelming majority enters remaining carbon on the further burning-off catalyzer of second dense bed through the dilute phase pipe, and the catalyzer after burning enters two-stage riser respectively.A circulation is finished in reaction.

The high-temperature flue gas that generation is burnt in regeneration enters the waste heat boiler recovery waste heat behind flue gas turbine expander or double slide valve, step-down orifice plate.

Compare with existing catalytic pyrolysis technology, the utility model device propene yield height, grand celebration long residuum propene yield is greater than 20%, reaction conditions relaxes, temperature of reaction approaches conventional catalytic cracking, is significantly less than other forms of catalytic pyrolysis: petrol and diesel oil quality better, diesel quality approach conventional catalytic cracking, quality of gasoline is better than conventional catalytic cracking, also is better than other forms of catalytic pyrolysis; This device need be in reaction injecting steam, the energy consumption of device is less than other forms of catalytic pyrolysis; Therefore economic benefit is better than other forms of cat-cracker greatly.The utility model device is applicable to producing more propylene and can improves the purpose of lightweight oil quality again when taking into account the light-end products productive rate.

Description of drawings

Fig. 1 is that the utility model heavy oil is produced propylene full scale plant formation synoptic diagram;

Wherein: 1 outer circulating tube; 2 two sections riser tubes are carried bed reaction lifter; 3 two sections regenerator sloped tubes; 4 burn jar; 5 inclined tubes to be generated; 6 stripping stages; 7 one sections riser tubes are carried bed reaction lifter; 8 one sections regenerator sloped tubes; 9 one sections riser reactors; 10 settling vessels; 11 revivifiers; 12 2 sections riser reactors.

Embodiment

Heavy oil described in the utility model produce propylene unit by outer circulating tube 1, two sections riser tubes carry bed reaction lifter 2, two sections regenerator sloped tubes 3, burn jars 4, inclined tube to be generated 5, stripping stage 6, one section riser tube are carried bed reaction lifter 7, one section regenerator sloped tube 8, one section riser reactor 9, settling vessel 10, revivifier 11 and two sections riser reactors 12 constitute.

One section riser reactor 9 lower end carries bed reaction lifter 7 tops to be connected with one section riser tube, and top is connected with settling vessel 10; One section riser tube carries bed reaction lifter middle part to be connected with revivifier 11 by one section regenerator sloped tube; Two sections riser reactor 12 bottoms carry bed reaction lifter 2 to be connected with two sections riser tubes, and top is connected with settling vessel 10; Two sections riser tubes carry bed reaction lifter middle part to be connected with revivifier 11 by two sections regenerator sloped tubes 3; Inclined tube 5 to be generated connects stripping stage 6 bottoms and burns jar 4; Settling vessel 10 bottoms are connected with stripping stage 6; Outer circulating tube 1 connects revivifier 11 and burns jar 4.

Claims

1. a heavy oil is produced propylene unit, by outer circulating tube, two sections riser tubes carry a bed reaction lifter, two sections regenerator sloped tubes, burn jar, inclined tube to be generated, stripping stage, one section riser tube carry bed to react a lifter, one section regenerator sloped tube, one section riser reactor, settling vessel, revivifier and two sections riser reactors to constitute; It is characterized in that:

One section riser reactor lower end carries bed reaction lifter top to be connected with one section riser tube, and top is connected with settling vessel; One section riser tube carries bed reaction lifter middle part to be connected with revivifier by one section regenerator sloped tube; Two sections riser reactor bottoms carry bed reaction lifter to be connected with two sections riser tubes, and top is connected with settling vessel; Two sections riser tubes carry bed reaction lifter middle part to be connected with revivifier by two sections regenerator sloped tubes; Inclined tube to be generated connects the stripping stage bottom and burns jar; The settling vessel bottom is connected with stripping stage; Outer circulating tube connects revivifier and burns jar.