阅读说明：本技术 一种沉降汽提方法 (Sedimentation steam stripping method ) 是由 厚鹏 石宝珍 郭俊辉 章洪恩 于 2020-06-18 设计创作，主要内容包括：一种沉降汽提方法,沉降器内部设置隔板,通过隔板将沉降器与下部的汽提段隔成两个空间；在沉降器内隔板上方除设置反应油气旋风分离器外,还设置汽提流出介质旋风分离器和汽提流出介质输送管；使通过汽提流出介质输送管进入汽提流出介质旋风分离器进一步的分离,避免汽提流出介质进入沉降器,防止沉降器结焦。(A settling steam stripping method is characterized in that a separator is arranged in a settler, and the settler and a steam stripping section at the lower part are separated into two spaces by the separator; a reaction oil-gas cyclone separator, a stripping outflow medium cyclone separator and a stripping outflow medium conveying pipe are arranged above the inner partition plate of the settler; the medium enters the stripping outflow medium cyclone separator through the stripping outflow medium conveying pipe for further separation, so that the stripping outflow medium is prevented from entering a settler, and the settler is prevented from coking.)

1. A settlement stripping method is characterized in that a settler (1) and a stripping section (3) are divided into an upper part and a lower part through a partition plate (2), the stripping section (3) is arranged below the partition plate (2), and a reaction oil gas primary cyclone separator (12) and a reaction oil gas secondary cyclone separator (13) are arranged in the settler (1) above the partition plate (2); an independent stripping outflow medium cyclone separator (14) is arranged in the settler (1); a reaction oil gas primary cyclone separator dipleg (12B), a reaction oil gas secondary cyclone separator dipleg (13B) and a stripping outflow medium cyclone separator dipleg (14B) penetrate through the partition plate (2), a dipleg outlet at the lower end of each dipleg is positioned below the partition plate (2), and a catalyst separated by each cyclone separator is discharged from a corresponding dipleg outlet and enters the stripping section (3); a stripping outflow medium conveying pipe (15) is vertically arranged on the partition plate (2), the lower end of the stripping outflow medium conveying pipe (15) is a stripping outflow medium inlet of the stripping section (3), and the upper end of the stripping outflow medium conveying pipe is positioned above the partition plate (2) and is directly connected with an inlet of a stripping outflow medium cyclone separator (14) in a sealing way; when the stripping outflow medium cyclone separator (14) is arranged in one stage, a gas outlet pipe (14A) of the stripping outflow medium cyclone separator is directly connected with a gas collection chamber (16) at the upper part of the settler (1), and when the stripping outflow medium cyclone separator (14) is arranged in two stages, a stripping outflow medium secondary cyclone separator is independently arranged, or a reaction oil gas secondary cyclone separator (13) is shared;

a gas outlet pipe (12A) of the reaction oil gas primary cyclone separator is hermetically connected with an inlet connecting pipe (12C) of the secondary cyclone separator and a reaction oil gas secondary cyclone separator (13) through an outlet of the reaction oil gas primary cyclone separator and an inlet of the reaction oil gas secondary cyclone separator (13), reaction oil gas from a riser reactor (5) arranged outside or inside the settler (1) firstly enters the reaction oil gas primary cyclone separator (12), gas after partial catalyst separation directly and completely enters the reaction oil gas secondary cyclone separator (13) from a gas outlet pipe (12A) of the reaction oil gas primary cyclone separator and a connecting pipe (12C) of the outlet of the reaction oil gas primary cyclone separator and the inlet of the secondary cyclone separator, gas after gas-solid separation enters an air collecting chamber (16) from a gas outlet pipe (13A) of the reaction oil gas secondary cyclone separator and then flows out from a reaction oil gas outlet (18) of the settler, part of oil gas carried by the catalyst enters a stripping section (3) at the lower part of the partition plate (2) through a dipleg (12B) of the reaction oil gas primary cyclone separator and a dipleg (13B) of the reaction oil gas secondary cyclone separator; the stripping outflow medium in the stripping section (3) carries the catalyst and the oil gas and enters a stripping outflow medium cyclone separator (14) for gas-solid separation; the steam stripping outflow medium flowing out of the steam stripping section (3) firstly enters a steam stripping outflow medium conveying pipe (15) from the lower part of the partition plate (2), enters a steam stripping outflow medium cyclone separator (14) from the steam stripping outflow medium conveying pipe (15) for gas-solid separation, and directly enters a gas collection chamber (16) or enters a steam stripping outflow medium secondary cyclone separator for continuous gas-solid separation and then enters the gas collection chamber (16); the steam stripping outflow medium secondary cyclone separator is arranged independently or shares the reaction oil gas secondary cyclone separator with the reaction oil gas, and the mixture enters a gas collection chamber (16) together with the reaction oil gas and flows out from a reaction oil gas outlet (18) of the settler.

2. Sedimentation stripping process according to claim 1, characterized in that a differential pressure sensor (43) is provided above and below the partition, monitoring the differential pressure above and below the partition (2).

3. The sedimentation stripping method according to claim 2, wherein the pressure difference between the upper and lower sides of the partition (2) is controlled by filling nitrogen (40), a nitrogen inlet pipe (41) is provided on the settler shell (11) of the settler (1) located above the partition (2), an inlet nitrogen regulating valve (42) is provided on the nitrogen inlet pipe (41), and the inlet amount of nitrogen (40) is controlled by controlling the opening of the inlet nitrogen regulating valve (42) by a pressure difference sensor (43) between the upper and lower sides of the partition.

4. Sedimentation stripping method according to claim 1, characterized in that the pressure above the partition (2) is controlled by means of a rapid nitrogen bleed (40), a nitrogen bleed (44) and a settler pressure sensor (46) are arranged on the settler shell (11) of the settler (1) above the partition (2), a nitrogen bleed regulating valve (45) is arranged at the nitrogen bleed (44), and the opening of the nitrogen bleed regulating valve (45) is controlled by the settler pressure sensor (46) to control the pressure above the partition (2) in the settler (1).

5. The sedimentation stripping method as claimed in claim 1, characterized in that the reaction oil gas primary cyclone dipleg (12B), the reaction oil gas secondary cyclone dipleg (13B), the stripping outflow medium cyclone dipleg (14B) and the stripping outflow medium conveying pipe (15) are all or partially welded with the partition plate (2).

6. The sedimentation stripping method as claimed in claim 5, wherein expansion joints (21) are provided on the reaction oil gas primary cyclone dipleg (12B), the reaction oil gas secondary cyclone dipleg (13B), the stripping effluent medium cyclone dipleg (14B) and the stripping effluent medium delivery pipe (15); the expansion joint (21) is positioned above the partition plate (2).

7. The sedimentation stripping method as claimed in claim 1, characterized in that the reaction oil gas primary cyclone dipleg (12B), the reaction oil gas secondary cyclone dipleg (13B), the stripping outflow medium cyclone dipleg (14B) and the junction of the stripping outflow medium conveying pipe (15) and the partition (2) are all or partially provided with a sleeve (22); the dipleg or the delivery pipe provided with the sleeve (22) extends to the lower part of the clapboard (2) through the inside of the sleeve (22); a packing seal (23) is provided between the dipleg or delivery tube and the sleeve (22).

8. The sedimentation stripping method as claimed in claim 1, characterized in that a steam distribution pipe (34) is arranged at the periphery of the dipleg outlet of the reaction oil gas primary cyclone dipleg (12B), steam flows out through the steam distribution pipe (34), and the catalyst is stripped before contacting with the catalyst from the reaction oil gas primary cyclone dipleg (12B).

9. Sedimentation stripping process according to claim 1, characterized in that stripping enhancement means (32) are provided in the stripping section (3), which means are of the square cone type.

Technical Field

The invention relates to a settling steam stripping method, which can effectively prevent a settler from coking and is particularly suitable for catalytic conversion process technology of the settler in a catalytic cracking device.

Background

The settling steam stripper is an important component of the catalytic cracking process, in order to make the catalyst and oil gas entering the settling vessel from the riser reactor carry out gas-solid separation and reduce the carried oil gas and green coke, a cyclone separator is arranged in the settling vessel, and a steam stripping section (or steam stripper) is arranged below the settling vessel, so that the cyclone separator can make the catalyst and the oil gas carry out gas-solid separation, the separated oil gas is discharged from an oil gas outlet and enters a fractionating system, part of the oil gas carried by the catalyst enters the steam stripper through a dipleg of the cyclone separator, and a part of the oil gas carried by the catalyst is replaced by steam stripping to complete a separation process of the catalyst and the oil gas.

In the prior art, oil gas stripped from a stripping section is in the space of a settler, so that the settler is coked, potential safety hazards are caused, the operation period of the device is influenced, and the overhauling difficulty is increased. Many catalytic conversion units are subject to coking of the settler catalyst.

Disclosure of Invention

The invention aims to provide a sedimentation stripping method, wherein a partition plate is arranged in a settler, and a special stripping outflow medium cyclone separator and a stripping outflow medium conveying pipe are arranged, so that the stripping outflow medium enters the stripping outflow medium cyclone separator through the stripping outflow medium conveying pipe for further separation, the stripping outflow medium is prevented from entering the settler, and the settler is prevented from coking.

The invention adopts the following technical scheme:

a settlement stripping method, it is made up of settler and stripping section, in this method divide settler and stripping section into two parts up and down through the baffle, the stripping section is under the baffle, the reaction oil gas cyclone separator is set up in the settler above the baffle; an independent stripping outflow medium cyclone separator is arranged in the settler besides the two-stage reaction oil-gas cyclone separator; each cyclone separator dipleg penetrates through the partition plate, a dipleg outlet at the lower end of the dipleg, namely a catalyst outlet, is arranged below the partition plate, and the catalyst separated by each cyclone separator is discharged from the corresponding dipleg outlet and enters a stripping section; a stripping outflow medium conveying pipe is vertically arranged on the partition plate, the lower end of the stripping outflow medium conveying pipe is a stripping section outflow medium inlet of a stripping section, and the upper end of the stripping outflow medium conveying pipe is arranged above the partition plate and is directly connected with an inlet of a stripping outflow medium cyclone separator in a sealing manner; the reaction oil gas cyclone separator is arranged in series according to two stages, namely a reaction oil gas primary cyclone separator and a reaction oil gas secondary cyclone separator are arranged, and the stripping outflow medium cyclone separator is arranged according to one stage or two stages in series; when the stripping outflow medium cyclone separator is arranged into a first stage, a gas outlet pipe of the stripping outflow medium cyclone separator is directly connected with a gas collection chamber at the top of the settler; when the stripping outflow medium cyclone separator is set to be two-stage, the second stage thereof, namely the stripping outflow medium second-stage cyclone separator, can be independently arranged or share the reaction oil gas second-stage cyclone separator, specifically, when the stripping outflow medium cyclone separator is set to be two-stage, or the stripping outflow medium second-stage cyclone separator is independently arranged to be used as the second-stage stripping outflow medium cyclone separator or share the reaction oil gas second-stage cyclone separator, at this time, the reaction oil gas second-stage cyclone separator also becomes the stripping outflow medium second-stage cyclone separator;

the gas outlet pipe of the reaction oil gas primary cyclone separator is hermetically connected with the inlet of the reaction oil gas secondary cyclone separator, reaction oil gas from a riser reactor arranged outside or inside the settler firstly enters the reaction oil gas primary cyclone separator, part of the gas after separation of the catalyst directly and completely enters the reaction oil gas secondary cyclone separator from the gas outlet pipe of the reaction oil gas primary cyclone separator, the gas after gas-solid separation enters a gas collection chamber from the gas outlet pipe of the reaction oil gas secondary cyclone separator and then flows out from the reaction oil gas outlet of the settler, and part of the oil gas carried by the catalyst enters a stripping section at the lower part of the partition plate through the dipleg of the reaction oil gas primary cyclone separator and the dipleg of the reaction oil gas secondary cyclone separator; the steam stripping outflow medium in the steam stripping section carries the catalyst and the oil gas to enter a steam stripping outflow medium cyclone separator newly arranged in the settler for gas-solid separation, so that the problem of catalyst coking is solved; the gas-stripping outflow medium flowing out of the gas-stripping section firstly enters a gas-stripping outflow medium conveying pipe from the lower part of the partition plate, enters a gas-stripping outflow medium cyclone separator from the gas-stripping outflow medium conveying pipe for gas-solid separation, and directly enters a gas collection chamber or enters a gas-stripping outflow medium secondary cyclone separator for continuous gas-solid separation and then enters the gas collection chamber; the steam stripping outflow medium secondary cyclone separator can be independently arranged, and can also share the reaction oil gas secondary cyclone separator with reaction oil gas, and the reaction oil gas are mixed to enter the gas collection chamber together and flow out from the reaction oil gas outlet of the settler.

In the invention, the two-stage series arrangement mode of the cyclone separators is that the outlet of the first-stage cyclone separator is communicated with the inlet of the second-stage cyclone separator, and the specific connection is known in the art.

In the sedimentation stripping method, preferably, a differential pressure sensor is arranged above and below the partition plate, and the differential pressure above and below the partition plate is monitored.

Furthermore, the pressure difference between the upper part and the lower part of the partition plate is controlled by adopting a nitrogen filling method, a nitrogen inlet pipe is arranged on the settler shell of the settler above the partition plate, an inlet nitrogen regulating valve is arranged on the nitrogen inlet pipe, the opening degree of the inlet nitrogen regulating valve is controlled by a pressure difference sensor between the upper part and the lower part of the partition plate, and the inlet amount of nitrogen is controlled.

In the settling and stripping method, preferably, the pressure above the partition plate is controlled by adopting a method of quickly discharging nitrogen, a nitrogen discharge port and a settler pressure sensor are arranged on a settler shell of the settler above the partition plate, a nitrogen discharge regulating valve is arranged at the nitrogen discharge port, and the opening degree of the nitrogen discharge regulating valve is controlled by the settler pressure sensor to realize the pressure control above the partition plate in the settler.

In the settling stripping method, preferably, all or part of the dipleg of the reaction oil-gas primary cyclone separator, the dipleg of the reaction oil-gas secondary cyclone separator, the dipleg of the stripping outflow medium cyclone separator and the stripping outflow medium conveying pipe are welded with the partition plate.

Expansion joints are arranged on the dipleg of the reaction oil-gas primary cyclone separator, the dipleg of the reaction oil-gas secondary cyclone separator, the dipleg of the stripping outflow medium cyclone separator and the stripping outflow medium conveying pipe; the expansion joint is located above the baffle.

In the settling and stripping method, preferably, all or part of the dipleg of the reaction oil-gas primary cyclone separator, the dipleg of the reaction oil-gas secondary cyclone separator, the dipleg of the stripping outflow medium cyclone separator, and the joint of the stripping outflow medium conveying pipe and the partition plate are provided with the casing pipe; the dipleg or the conveying pipe provided with the sleeve extends to the lower part of the clapboard through the inside of the sleeve, and a packing seal is arranged between the dipleg or the conveying pipe and the sleeve.

Preferably, a steam distribution pipe is arranged on the periphery of a catalyst outlet of a dipleg of the reaction oil-gas primary cyclone separator, steam flows out through the steam distribution pipe, contacts with a catalyst from the dipleg of the reaction oil-gas primary cyclone separator and is stripped by the catalyst, and the stripped gas is mixed with other gas from a stripping section and enters a stripping outflow medium conveying pipe.

Preferably, a stripping enhancing member is provided in the stripping section, which member is a stripping baffle or grid. Square pyramid type elements are preferred.

Compared with the prior art, the settling steam stripping method has the following beneficial effects:

1. because the separator is arranged in the settler, the settler and the stripping section at the lower part are divided into two spaces by the separator; a reaction oil-gas cyclone separator, a special stripping outflow medium cyclone separator and a stripping outflow medium conveying pipe are arranged above the separator in the settler; the medium enters a stripping outflow medium cyclone separator through a stripping outflow medium conveying pipe for further separation, so that the stripping outflow medium is prevented from entering a settler, the settler is prevented from coking, and the problems of influencing a catalyst outlet pipe, difficult cleaning, blocking a stripping grid and the like are avoided;

2. the yield of light oil is improved;

3. the amount of catalyst scorch to the regenerator is reduced.

Drawings

FIG. 1: the device structure of the settling steam stripping method is shown schematically;

FIG. 2: a schematic diagram of an apparatus for another form of the settling stripping process of the present invention;

FIG. 3: the part D in FIG. 1 is a partial structure enlarged view;

FIG. 4: an enlarged partial structure view of a portion D of another structure in FIG. 1;

FIG. 5: the part E of FIG. 1 is a partial structure enlarged view;

FIG. 6: the partial structure of the stripping strengthening part is enlarged in figure 1.

In the figure: 1. a settler, 2, a partition board, 3, a stripping section, 11, a settler shell, 12, a reaction oil gas primary cyclone separator, 12A, a reaction oil gas primary cyclone separator gas outlet pipe, 12B, a reaction oil gas primary cyclone separator dipleg, 12C, a reaction oil gas primary cyclone separator outlet and secondary cyclone separator inlet connecting pipe, 13, a reaction oil gas secondary cyclone separator, 13A, a reaction oil gas secondary cyclone separator gas outlet pipe, 13B, a reaction oil gas secondary cyclone separator dipleg, 14, a stripping outflow medium cyclone separator, 14A, a stripping outflow medium cyclone separator gas outlet pipe, 14B, a stripping outflow medium cyclone separator dipleg, 15, a stripping outflow medium conveying pipe, 16, a gas collection chamber, 17, a riser reactor and reaction oil gas primary cyclone separator inlet connecting pipe, 18, a settler reaction oil gas outlet, 19. the device comprises a nitrogen inlet, a nitrogen inlet 21, an expansion joint, a nitrogen outlet 22, a sleeve, a nitrogen inlet pipe 23, a filler seal 31, a stripping section shell, a stripping reinforcing part 32, a stripping outflow medium distributor 33, a stripping outflow medium distributor 34, a steam distribution pipe 40, nitrogen 41, a nitrogen inlet pipe 42, an inlet nitrogen regulating valve 43, a pressure difference sensor above and below a partition plate 44, a nitrogen outlet 45, a nitrogen discharge regulating valve 46, a settler pressure sensor 5 and a riser reactor.

Detailed Description

The following detailed description of the present invention is provided in connection with the accompanying drawings and the detailed description thereof, and is intended to assist the reader in understanding the nature and character of the present invention, but the drawings and the detailed description are not intended to limit the scope of the invention.

As shown in figures 1 and 2, the device of the settling and stripping method of the invention comprises a settler 1 and a stripping section 3, wherein the settler 1 and the stripping section 3 are divided into an upper part and a lower part by a partition plate 2, the stripping section 3 is arranged below the partition plate 2, and a reaction oil gas primary cyclone separator 12 and a reaction oil gas secondary cyclone separator 13 are arranged above the partition plate 2; besides the reaction oil gas cyclone separator, an independent stripping outflow medium cyclone separator 14 is arranged in the settler 1; a dipleg 12B of a reaction oil-gas primary cyclone separator, a dipleg 13B of a reaction oil-gas secondary cyclone separator and a dipleg 14B of a stripping outflow medium cyclone separator pass through the partition plate 2, material outlet ports, namely catalyst outlet ports, at the lower ends of the 3 diplegs are arranged below the partition plate 2, and the catalyst separated by each cyclone separator is discharged from the corresponding dipleg outlet port and enters the stripping section 3; a stripping outflow medium conveying pipe 15 is vertically arranged on the partition plate 2, the lower end of the stripping outflow medium conveying pipe 15 is an outflow medium inlet of the stripping section 3, and the upper end of the stripping outflow medium conveying pipe is arranged above the partition plate 2 and is directly connected with an inlet of a stripping outflow medium cyclone separator 14 in a sealing manner; the reaction oil-gas cyclone separators are arranged in series according to two stages, and the stripping outflow medium cyclone separator 14 is arranged according to one stage or two stages; when the stripping outflow medium cyclone separator 14 is arranged in one stage, a gas outlet pipe 14A of the stripping outflow medium cyclone separator is directly connected with the gas collecting chamber 16; when the stripping effluent medium cyclone 14 is arranged in two stages in series, the second stage can be independently arranged or share the reaction oil gas secondary cyclone 13.

The gas outlet pipe 12A of the reaction oil gas primary cyclone separator is hermetically connected with the inlet connecting pipe 12C of the secondary cyclone separator through the outlet of the reaction oil gas primary cyclone separator, the reaction oil gas from the riser reactor 5 arranged outside (shown in figure 2) or inside (shown in figure 1) the settler 1 firstly enters the reaction oil gas primary cyclone separator 12, the gas with part of catalyst separated directly and completely enters the reaction oil gas secondary cyclone separator 13 from the gas outlet pipe 12A of the reaction oil gas primary cyclone separator and the outlet of the reaction oil gas primary cyclone separator and the inlet connecting pipe 12C of the secondary cyclone separator, the gas after gas-solid separation enters the gas collection chamber 16 from the gas outlet pipe 13A of the reaction oil gas secondary cyclone separator, and then flows out from the outlet 18 of the settler reaction oil gas, and part of the catalyst carried oil gas passes through the dipleg 12B of the reaction oil gas primary cyclone separator and the dipleg 12B of the reaction oil gas secondary cyclone separator The material leg 13B of the air separator enters the stripping section 3 at the lower part of the clapboard 2; the steam stripping outflow medium in the steam stripping section 3 carries a catalyst and oil gas and enters a steam stripping outflow medium cyclone separator 14 additionally arranged in the settler 1 from a steam stripping outflow medium conveying pipe 15 for gas-solid separation, so that the problem of catalyst coking is solved, specifically, the steam stripping outflow medium flowing out of the steam stripping section 3 firstly enters the steam stripping outflow medium conveying pipe 15 from the lower part of the partition plate 2 and enters the steam stripping outflow medium cyclone separator 14 from the steam stripping outflow medium conveying pipe 15 for gas-solid separation, and the gas directly enters a gas collection chamber 16 or enters a steam stripping outflow medium secondary cyclone separator for continuous gas-solid separation and then enters the gas collection chamber 16; the secondary cyclone separator for the stripping outflow medium can be arranged independently, or can share the secondary cyclone separator 13 for reaction oil gas with the reaction oil gas, and the mixture of the reaction oil gas and the reaction oil gas enters the gas collection chamber 16 and flows out from the outlet 18 for the reaction oil gas of the settler.