RU2626360C1 - Vertical adsorber for butane fraction separation - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: vertical adsorber for butane fraction separation contains a cylindrical body with a lid and a bottom. In the lid there is a loading door, a branch pipe for supplying the initial butane mixture with a distribution mesh, an n-butane discharge branch pipe for desorption and a branch pipe for a safety valve, and in the middle part of the body there are beams with supports supporting a grate, on which two layers of stainless steel mesh are laid. The adsorbent bed is located between the two layers of stainless steel mesh and the mesh on which the weights are placed to prevent the adsorbent from being carried away during desorption. A discharge door is located in the body, and a manhole is made in the bottom. A methane fraction supply branch pipe for desorption, and a discharge pipe for adsorption isobutane and cooling exhaust gas and nitrogen are installed on the conical surface of the bottom. An electromagnet is connected to the grate by means of bearings. It creats vibration of the grate. According to the invention, vertical rods of circular cross section are staggered on the grate to transfer vibrations to the adsorbent bed.

EFFECT: improving the quality and productivity of butane fraction separation.

1 dwg

Description

The invention relates to equipment for the adsorption separation of the butane fraction into isobutane and n-butane on an adsorbent - zeolite in the form of granules with a diameter of 3 mm, located vertically along the height of the adsorber.

Known adsorber containing a housing with a lid and a bottom and an adsorbent layer located between them, as USSR No. 5164415, B01D 53/02 of 01/23/74.

A disadvantage of the known adsorber is that it does not provide a high degree of purification or separation of the gas stream from the target component.

A close technical solution to the claimed object is a vertical adsorber for separating the butane fraction, containing a cylindrical body with a lid and a bottom, while a loading hatch, a pipe for supplying the initial mixture of butane with a distribution net, a pipe for removing n-butane during desorption and a pipe are mounted in the lid for the safety valve, and in the middle part of the body there are beams with supports that support the grate, on which two layers of stainless steel mesh are laid, while the adsor layer the bent is located between two layers of stainless steel mesh and the mesh on which the goods are located to prevent adsorbent entrainment during desorption, while the discharge hatch is located in the body, and the inspection hatch, a pipe for supplying methane fraction for desorption and a pipe for isobutane removal are mounted in the bottom during adsorption and exhaust gas - nitrogen - during cooling, which is located on the conical surface of the bottom, while an electromagnet is attached to the grate with bearings using bearings, which creates vibrations grate (Patent of the Russian Federation for utility model No. 143812, publ. July 27, 2014).

A disadvantage of the known adsorber is the uneven height distribution of the adsorbent layer during operation of a horizontally vibrating grate, increasing the loading density to the bottom of the adsorber, which complicates the passage of gas through the nozzle and partially reduces overall productivity.

The technical problem to which the invention is directed is to improve the quality and productivity of the separation of the butane fraction.

This task is achieved in a vertical adsorber for separating the butane fraction, containing a cylindrical body with a lid and a bottom, while a loading hatch, a pipe for supplying the initial mixture of butane with a distribution net, a pipe for removing n-butane during desorption and a pipe for a safety valve are mounted in the lid and in the middle part of the body there are beams with supports supporting the grate, on which two layers of stainless steel mesh are laid, while the adsorbent layer is located between two layers of stainless steel mesh and a grid on which goods are located to prevent adsorbent entrainment during desorption, while the discharge hatch is located in the body, and a inspection hatch, a pipe for supplying the methane fraction during desorption and a pipe for removing isobutane during adsorption and spent gas - nitrogen - during cooling, which is located on the conical surface of the bottom, with an electromagnet connected to the grate using bearings, creating vibrations of the grate, according but the invention on the grate fitted staggered vertical rods of circular cross section to transmit oscillatory on the adsorbent bed.

Installing vertical rods of circular cross section on a grate in a checkerboard pattern with the possibility of transmitting vibrations to the adsorbent layer reduces the unevenness of the adsorbent layer in height when the vibrating grate is horizontal, reduces the loading density to the bottom of the adsorber, which increases the gas passage through the nozzle and increases overall productivity .

The invention is illustrated in the drawing, which shows a diagram of the operation of the adsorber with the main elements of its design.

The device of the vertical adsorber.

The vertical adsorber has a cylindrical body 1 with a conical cover 2 and a bottom 3. A loading hatch 4, a pipe 5 for supplying the initial mixture - butane fraction - and cooling gas - nitrogen - through a distribution grid 6, a pipe 7 for n-butane removal are mounted in the cover 2 during desorption and pipe 8 for the safety valve. In the middle part of the casing, beams 9 are installed with supports 10 supporting the grate 11, on which two layers of stainless steel nets are laid 12. The adsorbent layer 13 — zeolite in the form of granules with a diameter of 3 mm — is located between two layers of stainless steel nets 12 (instead of layer of gravel) and a grid 14, on which loads 15 are located to prevent the entrainment of adsorbent 13 during desorption. The discharge of the spent adsorbent 13 is carried out through the discharge hatch 16 mounted in the housing. An inspection hatch 17 with a nozzle 18 for condensate drainage is mounted in the bottom 3, a nozzle 19 for supplying a methane fraction during desorption, and a nozzle 20 for removing isobutane during adsorption and exhaust gas, nitrogen, during cooling. The adsorber is mounted on the stand using the support ring 21. An electromagnet 23 having a core 24 is connected to the grate 11 using bearings 22. A spring 25 is connected to the electromagnet 23 on the other hand, resting on a fixed support 26.

On the grate 11 in a checkerboard pattern installed vertical rods 27 of circular cross section with the possibility of transmitting vibrations to the adsorbent layer 13.

The adsorber works as follows.

The butane fraction for separation is fed to the upper part of the apparatus through a nozzle 5 for feeding the initial mixture through a distribution grid 6. Isobutane, separated from n-butane, is removed from the adsorber through a nozzle 20. Adsorbent 13 — zeolite in the form of granules with a diameter of 3 mm — is loaded through a loading hatch 4, and the spent adsorbent is removed through the discharge hatch 16. Desorption is carried out by feeding methane fraction through the pipe 19. The pipe 7 is designed to divert n-butane during desorption, and a pressure relief valve is installed in the pipe 8 for trouble-free flow of the process.

The proposed design of the adsorber allows you to increase the uniformity of the adsorbent distribution over the height of the adsorber by attaching the electromagnet 23 to the grate 11 using bearings 22. To the electromagnet 23, on the other hand, a spring 25 is connected, resting on a fixed support 26. The core of the electromagnet 24 forms a magnetic field that attracts the grate 11, while the electromagnet 23 abuts against the spring 25, causing it to compress. Upon reaching maximum compression, the spring 25 begins to expand, returning the electromagnet 23 to its original position, thereby causing horizontal vibrations of the grate 11. As a result of vibrations, the adsorbent entering the adsorber through the loading hatch 4 is evenly distributed over the grate, forming a uniform layer in height. Vertical round rods mounted on the grate in a checkerboard pattern with the possibility of transmitting vibrations to the adsorbent layer reduce the unevenness of the adsorbent layer in height when the vibrating grate is horizontal, reduce the loading density to the bottom of the adsorber, which increases the gas passage through the nozzle and increases productivity in general . The round cross-sectional shape of the vertical rods provides optimal force on the vibration absorbent from the surface of the rods over the entire adsorbent volume. The operation mode of the electromagnet is established experimentally.

Unlike analogues, the proposed technical solution improves the quality of separation of the butane fraction due to the uniform distribution of the adsorbent in height by using an electromagnet that allows you to create horizontal vibrations of the grate, and transmit vibrations through vertical rods to the entire absorbent volume.

Claims (1)

A vertical adsorber for separating the butane fraction, containing a cylindrical body with a lid and a bottom, with a loading hatch, a pipe for supplying the initial mixture of butane with a distribution net, a pipe for removing n-butane during desorption and a pipe for the safety valve, and in the middle parts of the body are equipped with beams with supports supporting the grate, on which two layers of stainless steel mesh are laid, while the adsorbent layer is located between two layers of stainless steel mesh and the net on which the goods are located to prevent the adsorbent from being carried away during desorption, while the discharge hatch is located in the body, and the inspection hatch, a pipe for supplying the methane fraction during desorption, and a pipe for removing isobutane during adsorption and exhaust gas - nitrogen - are mounted on the bottom during cooling, which is located on the conical surface of the bottom, while an electromagnet is attached to the grate using bearings, creating vibrations of the grate, characterized in that on the grate eshetke staggered set vertical rods of circular cross section to transmit oscillatory on the adsorbent bed.

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