CN202823315U

CN202823315U - catalyst section-separating on-line regeneration

Info

Publication number: CN202823315U
Application number: CN2012204471645U
Authority: CN
Inventors: 刘善兵; 宋守刚; 徐伟强
Original assignee: SHANDONG QILU PETROCHEMICAL ENGINEERING Co Ltd
Current assignee: SHANDONG QILU PETROCHEMICAL ENGINEERING Co Ltd
Priority date: 2012-09-04
Filing date: 2012-09-04
Publication date: 2013-03-27
Anticipated expiration: 2022-09-04

Abstract

The utility model relates to a catalyst section-separating on-line regeneration radial fixed bed oxidative dehydrogenation reactor and belongs to the field of chemical production equipment. A reaction gas outlet of a first reactor is connected with a reaction gas inlet of a second reactor through a pipe. The catalyst section-separating on-line regeneration radial fixed bed oxidative dehydrogenation reactor is characterized in that the first reactor and the second reactor are pressure shells composed of a cylinder, an upper seal head and a lower seal head ,a catalyst inner tube and a catalyst outer tube which are homocentric and formed by a cylinder with an opening and a Johnson screen are arranged on the inside of the pressure shells, catalyst is filled in an annular space between the catalyst inner tube and the catalyst outer tube, and inert magnetic balls are filled in the Johnson screen. A space between the catalyst inner tube and the cylinder is divided into a plurality of sections due to the fact that a plurality of annular plates are arranged between the catalyst inner tube and the cylinder, wherein a feeding inlet is arranged in each section of the first reactor and a reaction gas inlet and a regenerated gas inlet are arranged in each section of the second reactor. The catalyst section-separating on-line regeneration radial fixed bed oxidative dehydrogenation reactor achieves the aim of simultaneously on-line processing of oxidative dehydrogenation reaction and catalyst regeneration.

Description

The radial fixed-bed oxidative dehydrogenation reactor of catalyst segments on-line regeneration

Technical field

The utility model relates to a kind of radial fixed-bed oxidative dehydrogenation reactor of catalyst segments on-line regeneration, belongs to the chemical production equipment field.

Background technology

Butadiene is to produce elastomeric important source material, and utilizing butene-1 oxidative dehydrogenation to produce butadiene is the important means of producing butadiene.Oxidative dehydrogenation under the effect of suitable temperature and catalyst, occurs in the steam, air and the butene-1 that mix in proportion, generates butadiene, emits simultaneously a large amount of heat energy.

Produce in the process units of butadiene in butene-1 oxidative dehydrogenation, according to the device production scale, by the some production lines of capabilities setting of about 20,000 tons of production lines, every production line arranges the axial restraint bed bioreactor of 2 serial operations to reaction member usually.Water vapour and the air Mixture prepared in proportion, be heated to about 300 ℃, add butene-1, enter the 1# reactor, along equipment axis to the catalyst layer that passes through in the reactor, oxygen in butene-1 and the gas reacts, generate butadiene, gas temperature rises to about 500 ℃ simultaneously, after the heat exchanger heat exchange, gas temperature is reduced to more than 300 ℃, after again adding butene-1, enter the 2# reactor, butene-1 and oxygen in the gas react, generate butadiene, finally obtain preferably conversion ratio and selective

Under reaction condition, the hydro carbons in the gas generates coke easily because of side reactions such as cracking at catalyst surface, make the activity decreased of catalyst, cause conversion ratio and elective reduction, plant capacity descends and energy consumption increases, and has to every about 1～3 month catalyst be carried out coke burning regeneration.Not only have a strong impact on the economic benefit of device, also cause the follow-up refining production unit that waits to operate fluctuation.

The utility model content

According to the deficiencies in the prior art, the technical problems to be solved in the utility model is: the radial fixed-bed oxidative dehydrogenation reactor that a kind of catalyst segments on-line regeneration is provided, shorten the catalyst coke burning regeneration cycle, make activity, the conversion ratio of catalyst and selectively within production cycle of device, remain at preferably level.

The technical scheme that its technical problem that solves the utility model adopts is: the radial fixed-bed oxidative dehydrogenation reactor that a kind of catalyst segments on-line regeneration is provided, comprise 1# reactor and 2# reactor, the reaction gas outlet of 1# reactor connects the reaction gas entrance of 2# reactor by pipeline, it is characterized in that described 1# reactor and 2# reactor are cylinder, the pressure-bearing shell that upper cover and low head form, arrange concentric in the pressure-bearing shell, the catalyst inner core and the catalyst urceolus that are formed by perforate cylinder and Johnson Net, annular space catalyst filling between catalyst inner core 4 and the catalyst urceolus 3, partially filled inertia magnetic ball without Johnson Net, the cone that distributes is set in the catalyst inner core, be provided with a plurality of ring flat-plates between catalyst urceolus and the cylinder, space uniform ground between catalyst urceolus and the cylinder is divided into multistage, wherein every section of 1# reactor is provided with material inlet, and every section of 2# reactor is provided with reaction gas entrance and regeneration gas entrance.

Be provided with the Catalyst packing mouth on the upper cover of 1# reactor and 2# reactor; Be provided with catalyst on the low head and unload outlet.

Described catalyst unloads on outlet and the upper cover and is provided with the gas atmosphere inlet.

Be provided with manhole on the low head of described distribution cone lower end, be provided with the gas atmosphere inlet on the manhole.

Be provided with 3～4 thermocouple interfaces on the described upper cover, each interface inserts the thermocouple of quantity and segments equal number, monitors respectively the temperature of each section outlet side.

The a plurality of ring flat-plates that arrange between described catalyst urceolus and the cylinder evenly distribute.

Described catalyst inner core upper end is provided with expansion joint.

Described catalyst inner core and catalyst urceolus form by perforate cylinder and Johnson Net, and the width between catalyst inner core and the catalyst urceolus is more than or equal to 500mm.

In order to make things convenient for temperature survey near inner core Johnson Net place (gas vent side) 3～4 points for measuring temperature to be set at every section catalyst, be used for the operating process of monitoring dehydrogenation and regeneration.

After the mist heating with steam and air, enter reactor by the material inlet on the 1# reactor cylinder body, the pipeline of raw material butene-1 gas at each material inlet place adds.Mist enters the 1# reactor, and by catalyst layer generation oxidative dehydrogenation, simultaneous temperature rises, and reacted gas is discharged from the outlet of 1# reactor head.

After the heat exchange cooling, enter 2# reactor by the entrance on the 2# reactor cylinder body from the reaction gas of 1# reactor, the pipeline of raw material butene-1 gas in each reaction gas porch of adding adds.Discharge from the outlet of 2# reactor head by the gas behind the catalyst layer generation oxidative dehydrogenation, enter follow-up heat exchange, condensation, separation and distillation process.

When by temperature detection and sample analysis, when finding that catalyst activity is reduced to a certain degree, begin to carry out the segmentation on-line regeneration of catalyst.

During the regeneration of 1# reactor catalyst, the adding that only need sequentially stop each material inlet place raw material butene-1 gets final product.The starting stage of each section catalyst regeneration, the temperature detection displays temperature that is arranged on this section is higher, when the temperature detection displays temperature begins to descend, and during a little more than inlet temperature, show that namely this section catalyst regeneration finishes, recover the adding of this section raw material butene-1 gas, this section namely enters the dehydrogenation reaction stage.Stop the adding of the raw material butene-1 of next section, begin to carry out catalyst regeneration.Carry out successively by above-mentioned steps, finish until whole beds is all regenerated.

During the regeneration of 2# reactor catalyst, need sequentially stop the adding of each reaction gas entrance reacting gas, add regeneration gas from the regeneration gas entrance.Identical when regenerating with the 1# reactor, when the temperature detection displays temperature that is arranged on regenerator section begins to descend, and during a little more than inlet temperature, show that namely this section catalyst regeneration finishes, recover the adding of this section reacting gas, this section namely enters the dehydrogenation reaction stage.Successively next section catalyst is carried out regenerative operation by above-mentioned steps, finish until whole beds is all regenerated.

According to loaded catalyst and regeneration interval, every catalyst regeneration period is about 2～4 hours.

The beneficial effects of the utility model are: the radial fixed-bed oxidative dehydrogenation reactor of catalyst segments on-line regeneration, realized the purpose that oxidative dehydrogenation and catalyst regeneration carry out simultaneously online, make activity, the conversion ratio of catalyst and selectively within production cycle of device, remain at preferably level, the continuous cycle of operation of extension fixture, reduced the fluctuation of reaction member, the production unit stable operations such as follow-up condensation, separation and rectifying, whole device capbility and energy consumption remain on good level, improve the on-road efficiency of device.

Description of drawings

Fig. 1 is the structural representation of 1# reactor of the present utility model;

Fig. 2 is the structural representation of 2# reactor of the present utility model;

1 is upper cover among the figure; 2 is cylinder; 3 is the catalyst urceolus; 4 is the catalyst inner core; 5 are the cone that distributes; 6 is ring flat-plate; 7 is low head; 8 is manhole; 9 unload outlet for catalyst; 10 is expansion joint; 11 is the gas atmosphere inlet; 12 is the thermocouple interface; 13 is the Catalyst packing mouth; 14 is reaction gas outlet; 15 is material inlet; 16 is the reaction gas entrance; 17 is the regeneration gas entrance.

The specific embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is described further:

Shown in Fig. 1 ~ 2, the utility model comprises: 1# reactor and 2# reactor, the reaction gas outlet 14 of 1# reactor connects the reaction gas entrance 16 of 2# reactor by pipeline, it is characterized in that described 1# reactor and 2# reactor are the pressure-bearing shell that cylinder 2, upper cover 1 and low head 7 form, catalyst inner core 4 and catalyst urceolus 3 concentric, that be comprised of perforate cylinder and Johnson Net are set in the pressure-bearing shell, annular space catalyst filling between catalyst inner core 4 and the catalyst urceolus 3 is without the partially filled inertia magnetic ball of Johnson Net.The catalyst inner core 4 interior cones 5 that distribute that arrange, be provided with 7 ring flat-plates 6 between catalyst urceolus 3 and the cylinder 2, space between catalyst urceolus 3 and the cylinder 2 is divided into 8 sections, wherein every section of 1# reactor is provided with material inlet 15, and every section of 2# reactor is provided with reaction gas entrance 16 and regeneration gas entrance 17.

1# reactor and 2# reactor are provided with Catalyst packing mouth 13 on the upper cover 1; Be provided with catalyst on the low head 7 and unload outlet 9 and manhole 8.

1# reactor and 2# reactor, upper cover 1, catalyst unload outlet 9 and manhole 8 is provided with gas atmosphere inlet 11.

1# reactor and 2# reactor are provided with 3 thermocouple interfaces 12 on the upper cover 1, each interface inserts 8 thermocouples, monitor respectively the temperature of each section outlet side.

1# reactor and 2# reactor, catalyst inner core 4 upper ends are provided with expansion joint 10.

Claims

1. the radial fixed-bed oxidative dehydrogenation reactor of a catalyst segments on-line regeneration, comprise 1# reactor and 2# reactor, the reaction gas outlet of 1# reactor (14) connects the reaction gas entrance (16) of 2# reactor by pipeline, it is characterized in that described 1# reactor and 2# reactor are cylinder (2), the pressure-bearing shell that upper cover (1) and low head (7) form, arrange concentric in the pressure-bearing shell, the catalyst inner core (4) and the catalyst urceolus (3) that are formed by perforate cylinder and Johnson Net, annular space catalyst filling between catalyst inner core 4 and the catalyst urceolus 3, partially filled inertia magnetic ball without Johnson Net, the cone (5) that distributes is set in the catalyst inner core (4), be provided with a plurality of ring flat-plates (6) between catalyst urceolus (3) and the cylinder (2), space uniform ground between catalyst urceolus (3) and the cylinder (2) is divided into multistage, wherein every section of 1# reactor is provided with material inlet (15), and every section of 2# reactor is provided with reaction gas entrance (16) and regeneration gas entrance (17).

2. the radial fixed-bed oxidative dehydrogenation reactor of catalyst segments on-line regeneration according to claim 1 is characterized in that described 1# reactor and 2# reactor, is provided with Catalyst packing mouth (13) on the upper cover (1); Be provided with catalyst on the low head (7) and unload outlet (9) and manhole (8).

3. the radial fixed-bed oxidative dehydrogenation reactor of catalyst segments on-line regeneration according to claim 1; it is characterized in that described 1# reactor and 2# reactor, upper cover (1), catalyst unload outlet (9) and manhole (8) is provided with gas atmosphere inlet (11).

4. the radial fixed-bed oxidative dehydrogenation reactor of catalyst segments on-line regeneration according to claim 1, it is characterized in that described 1# reactor and 2# reactor, be provided with 3～4 thermocouple interfaces (12) on the upper cover (1), each interface inserts the thermocouple of quantity and segments equal number, monitors respectively the temperature of each section outlet side.

5. the radial fixed-bed oxidative dehydrogenation reactor of catalyst segments on-line regeneration according to claim 1 is characterized in that described 1# reactor and 2# reactor, and catalyst inner core (4) upper end is provided with expansion joint (10).