CN105327552B - Double Bag Vane Separator for Separating Liquids from Gases - Google Patents

Abstract

A dual bag vane separator for separating liquids from gases is disclosed. The double bag type vane separator for separating liquid from gas of the present invention comprises: a plurality of z-shaped channels defined between the plurality of plates, and first and second fluid collection bags disposed on a first sidewall between adjacent peaks and valleys in the z-shaped channels, the first fluid collection bag disposed on a downstream side in an airflow direction relative to the second fluid collection bag, a common inlet for the first and second fluid collection bags disposed between the peaks and valleys, wherein at least one of an edge of the first fluid collection bag at the common inlet and an edge of the second fluid collection bag at the common inlet is arcuate. The dual bag vane separator of the present invention can provide improved throughput and performance for removing liquids from gases.

Description

Double Bag Vane Separator for Separating Liquids from Gases

technical field

The present invention relates generally to vane separators for removing liquids from gases, and more particularly to vane separators of the double bag type.

Background technique

Vane separators have been used in industrial applications to separate liquids from gases since the 1930s. This type of vane separator is a multilayer plate structure. The gas is forced to move in a zigzag between the plates, so that the liquid droplets in the gas are easily attached to the surface of the blade due to the inertial force, thus realizing the separation of gas and liquid.

Another type of gas-liquid separator is a wave plate separator. The original wave plate designs, also known as bagless vane separators, were manufactured in the late 1920s. Wave plate separators are made of sheet metal. Compared with bagged vane separators, this wave plate separator has a weaker processing capacity and requires a larger area to process the gas-liquid mixture at the same flow rate.

The use of single-bag vane separators began in the 1930s. These blades can be formed and welded by extrusion or by a pultrusion process. Compared with the wave plate separator, the single-bag blade separator has improved processing capacity, but it still cannot reach the level of the double-bag blade separator.

Single bag vane separators have inconsistent gas path widths. Specifically, as shown in FIG. 1 , the single-bag type blade separator has a blade body 11 and a single bag 12 . Arrows indicate the direction of airflow. Gas enters the gas path through a wider inlet. The gas path narrows near the individual bags 12 and then widens in the area between two adjacent individual bags 12 . This inconsistency in the width of the gas path causes the gas to contract at the single bag 12 and expand in the area between two adjacent single bags 12 , and the process of first compression and then expansion further causes a drop in gas pressure. More importantly, the compression and expansion cause shear forces on the droplets and thus can cause them to be broken up in the high velocity air flow within the blade.

Double-bag vane separators began to be used in the 1970s. Such vane separators are usually manufactured using forming and welding. Compared with the single-bag blade separator, the double-bag blade separator increases the pressure drop and improves the processing capacity.

In FIG. 2 a double bag type vane separator is shown. The double bag type blade separator includes a blade body 21 and a double bag formed by a first bag 22 and a second bag 23 . Compared with the single-bag type vane separator, the double-bag type vane separator has a lower pressure because the width of the gas path in the vane separator is uniform. Specifically, when the gas enters the vane separator, the gas is compressed into the channels. The width of the gas path is consistent along the length of the vane separator. Therefore, there is no compression or expansion of the gas as it flows into the channel.

Dual-bag vane separators can efficiently separate liquids at higher speeds with less droplet breakup than single-bag vane separators.

To illustrate the liquid behavior in a double-bag vane separator, a schematic diagram of its cross-section is shown in Figures 3a and 3b. The droplets deposit on the leaf surface and form a film that is about to separate from the leaf. If the gas velocity in the double bag vane separator is high, this film will be entrained by the gas and thus cannot be separated from the gas (Fig. 3a). However, if the gas velocity is within the capacity of the blades, this membrane will roll up and flow into the bag (Fig. 3b).

Advanced separation systems in use today use double bag type vane separators.

High performance blades with multiple double pockets per wavelength of the blade are also known in the art (eg US Patent No. 5,104,431). These blades can be manufactured using forming and welding or by extrusion. As their name indicates, high performance vanes offer higher throughput compared to double bag vane separators. The disadvantage of this kind of blade is that it has a deep pitch, so it is often used in series and multi-stage, only for special applications.

US Patent No. 6,810,835 B2 (hereinafter referred to as the '835 patent) discloses a double-bag blade type separator. The vane separator comprises a plurality of flat frame plates (102 in the '835 patent) arranged parallel to each other to define a plurality of z-shaped passages (101 in the '835 patent) between the flat frame plates. The double pockets (120, 122 in the '835 patent) are formed by welding the vanes (104, 106, 108, 110, 112 and 114 in the '835 patent) to the plate. However, this patent has a rectilinear body portion (102) that tends to vibrate. It relies on welded pockets to provide strength. Also, with respect to the '835 patent, there is severe compression and expansion of the gas flowing through the separator. This compression and expansion results in shearing of the droplets and causes fragmentation. Also, it will cause a higher pressure drop.

Contents of the invention

Object of the invention: The present invention aims to solve the above-mentioned problems of the prior art and proposes an improved double-bag type vane separator to improve the throughput and performance of removing liquid from gas. In particular, the present invention aims to provide a double bag type rigid vane separator with attached collection bags for gas (or vapor)/oil (or liquid) separation with a smaller droplet breakup rate .

Technical solution: According to the present invention, there is provided a double-bag type vane separator for separating liquid from gas, comprising:

a plurality of z-shaped channels defined between the plurality of plates, and

a first liquid collection bag and a second liquid collection bag, the first liquid collection bag and the second liquid collection bag are arranged on the first side wall between adjacent crests and troughs of the z-shaped channel, The first liquid collection bag is arranged on the downstream side of the second liquid collection bag in the airflow direction, and the first liquid collection bag and the second liquid collection bag are arranged between the adjacent peaks and troughs common entrance,

Wherein, the edge of the first liquid collection bag at the common inlet and the edge of the second liquid collection bag at the common inlet, at least one of these two edges is arc-shaped.

Preferably, the edge of the first liquid collection bag at the common inlet is curved. More preferably, the edges of the first liquid collection bag and the second liquid collection bag at the common inlet are arc-shaped.

Preferably, said plurality of z-shaped channels are parallel to each other. More preferably, said plurality of z-shaped channels is defined by a plurality of z-shaped plates arranged parallel to each other.

Preferably, said first fluid collection bag is formed by folding said plate such that the edge of said first fluid collection bag at said common inlet is curved. Preferably, a first portion of the fold of the panel is parallel to a first side wall of the z-shaped channel, and a second portion of the fold of the plate is parallel to a second side wall of the z-shaped channel, so The second side wall is adjacent to the first side wall and located upstream of the first side wall in the airflow direction.

Preferably, the second liquid collection bag comprises a flap consisting of a first part and a second part, the first part of the flap is fixed to the z-shaped channel adjacent to the first side wall and On a second side wall upstream of the first side wall in the direction of airflow, wherein the second portion of the fin extends from the first portion of the fin. More preferably, the second portion of the flap is parallel to the first side wall, and/or the second portion of the flap is folded such that the second liquid collection bag is at the common inlet. The edges are curved.

Preferably, the depth of the double bag vane separator is in the range of 3-12 inches, the depth of the vane separator is from the farthest point on the left side to the farthest point on the right side in the airflow direction The distance between the channels. In the present invention, as shown in the drawings, the left side in the airflow direction refers to the airflow inlet side of the blade separator, and the right side in the airflow direction refers to the airflow exit side of the blade separator.

The above-mentioned preferred features can be used individually and/or in any combination.

The present invention also provides a double bag type vane separator for separating liquid from gas, said vane separator comprising:

a plurality of z-shaped channels defined between the plurality of plates, and

a first liquid collection bag and a second liquid collection bag, the first liquid collection bag and the second liquid collection bag are arranged on the first side wall between adjacent crests and troughs in the z-shaped channel, The first liquid collection bag is arranged on the downstream side of the second liquid collection bag in the airflow direction, and the first liquid collection bag and the second liquid collection bag are arranged between the adjacent peaks and troughs. Common inlet for liquid collection bags,

wherein the first fluid collection bag is formed by folding the panel so that the edge of the first fluid collection bag at the common inlet is curved, and the second fluid collection bag is formed by folding the flaps The first portion of the sheet is welded to the second side wall of the z-shaped channel, the second side wall is located upstream in the direction of air flow of the first side wall and adjacent to the first side wall , wherein the second portion of the fin extends from the first portion of the fin.

Preferably, said plurality of z-shaped channels are parallel to each other. More preferably, said plurality of z-shaped channels is defined by a plurality of z-shaped plates arranged parallel to each other.

Preferably, a first portion of the fold of the panel is parallel to the first side wall of the z-shaped channel, and a second portion of the fold of the plate is parallel to the second side wall.

Preferably, the second portion of the fin is parallel to the first side wall.

Preferably, the second portion of the flap is folded such that the edge of the second fluid collection bag at the common inlet is curved.

Preferably, the depth of the double bag vane separator is in the range of 3-12 inches, the depth of the vane separator is from the farthest point on the left side to the farthest point on the right side in the airflow direction The distance between the channels. In this application, as shown in the drawings, the left side in the airflow direction refers to the airflow inlet side of the blade separator, and the right side in the airflow direction refers to the airflow exit side of the blade separator.

The above-mentioned preferred features can be used individually and/or in any combination.

The present invention can be used to remove liquid from gas in many applications, for example, applications include but are not limited to:

removal of water from steam in nuclear power plants;

removal of water from steam in geothermal applications;

removal of water from steam in boiler applications;

Remove oil from gas in gas transmission applications;

removal of heavy hydrocarbons from gases in chemical plants;

removal of hydrocarbons from gases in petrochemical plants;

LNG in liquefied natural gas applications;

Removal of liquid ammonia from syngas;

sulfur recovery;

Removal of condensate from gases in power generation applications;

Removal of condensate from gases in gas manufacture;

Removal of condensate from gas in underground gas storage;

Removing rainwater from the air in ventilation systems; etc.

Description of drawings

Through the following detailed description in conjunction with the accompanying drawings, the above and other objects, features and advantages of the present invention will be more apparent, wherein:

Fig. 1 is the schematic diagram of the prior art single-bag blade type separator;

Fig. 2 is the schematic diagram of double-bag type vane type separator of prior art;

Fig. 3 a and Fig. 3 b are the schematic diagrams that are used to explain the liquid behavior in double-bag type vane type separator;

4 is a schematic diagram of a first embodiment of a double-bag type vane separator according to the present invention;

Fig. 5 is a schematic diagram of a second embodiment of a double bag type vane separator according to the present invention.

detailed description

Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications of equivalent forms all fall within the scope defined by the appended claims of this application.

A double bag type vane separator for separating liquid from gas according to the present invention, comprising:

a plurality of z-shaped channels defined between the plurality of plates, and

a first liquid collection bag and a second liquid collection bag, the first liquid collection bag and the second liquid collection bag are arranged on the first side wall between adjacent crests and troughs of the z-shaped channel, The first liquid collection bag is arranged on the downstream side of the airflow direction of the second liquid collection bag, and the first liquid collection bag and the second liquid collection bag are arranged between the adjacent peaks and troughs. the common entrance of the bag,

Wherein, the edge of the first liquid collection bag at the common inlet and the edge of the second liquid collection bag at the common inlet, at least one of these two edges is arc-shaped.

In an advantageous embodiment, the edge of the first liquid collection bag at the common inlet is curved. More preferably, the edges of the first liquid collection bag and the second liquid collection bag at the common inlet are arc-shaped.

The inventors of the present invention found that the sharp edge of the inlet of the collection bag would cause an undesirable pressure drop in the separation system. In the present invention, at least one of the edges of the first liquid collection bag at the common inlet and the edge of the second liquid collection bag at the common inlet is arc-shaped. Thus, sharp edges are eliminated.

The plates may be z-shaped plates. The plate may also be a flat plate as shown in the '835 patent as long as at least one of the edges of the first fluid collection bag at the common inlet and the edge of the second fluid collection bag at the common inlet is curved. In a preferred embodiment of the present invention, said plurality of z-shaped channels is defined by a plurality of z-shaped plates arranged parallel to each other.

The first fluid collection bag may be formed by folding the panel such that the edge of the first fluid collection bag at the common inlet is curved. In this case, the first fluid collection pocket is formed by a folded portion of the panel and an adjacent unfolded portion of the panel. Preferably, the first portion of the folded portion of the panel is parallel to the first side wall of the z-shaped channel, the first portion of the folded portion of the panel extending between the first portion of the folded portion of the panel and the adjacent unfolded portion of the panel A second portion of the folded portion of the panel is parallel to a second side wall of the z-shaped channel that is adjacent to the first side wall and at which the air flow of the first side wall is located. direction upstream.

Preferably, said second liquid collection bag can be secured by means of a flap to a second side wall of said z-shaped channel adjacent to said first side wall and upstream in the direction of air flow of said first side wall wherein a first portion of a tab is secured to said second side wall, for example by welding, and a second portion of said tab extends from said first portion of the tab. More preferably, the second portion of the flap is parallel to the first side wall, and/or the second portion of the flap is folded such that the second liquid collection bag is at the common inlet. The edges are curved.

Prior art vane separators, such as that of the '835 patent, rely on welded bags for strength and are prone to vibration. However, in the present invention, the double-bag vane separator has a very rigid body formed by a plate, which comprises a first liquid collection bag formed by a fold, which is an integral part of said plate. Therefore, the vane separator according to the present invention is not prone to vibration and is easy to manufacture.

Preferably, the depth of the vane separator is in the range of 3-12 inches, and the depth of the vane separator is the depth of the channel between the farthest point on the left and the farthest point on the right in the direction of airflow. distance. The advantage of a greater depth vane separator is that it will handle more liquid, and the advantage of a smaller depth vane separator is that it will provide less pressure drop. According to the present invention, the preferred range of depth is 3-12 inches.

The present invention also provides a double bag type vane separator for separating liquid from gas, said vane separator comprising:

a plurality of z-shaped channels defined between the plurality of plates, and

a first liquid collection bag and a second liquid collection bag, the first liquid collection bag and the second liquid collection bag are arranged on the first side wall between adjacent crests and troughs in the z-shaped channel, The first liquid collection bag is arranged on the downstream side of the airflow direction of the second liquid collection bag, and the first liquid collection bag and the second liquid collection bag are arranged between the adjacent peaks and troughs. the common entrance of the bag,

wherein the first fluid collection bag is formed by folding the panel so that the edge of the first fluid collection bag at the common inlet is curved, and the second fluid collection bag is formed by folding the flaps The first portion of the sheet is welded to a second side wall located upstream in the direction of air flow from and adjacent to the first side wall, wherein the fins The second portion of the fin extends from the first portion of the fin.

Double-bag vane separators have two opposing liquid collection bags, one of which is formed by folding a plate and the other by an additional part (i.e., a tab) welded to the plate . This has never been done before in the field of vane separator technology. There has never been a vane separator that contained a folded collection bag and a welded collection bag in the same vane separator.

Also, as mentioned above, the double bag vane separator has a very rigid body formed by a plate, including a first liquid collection bag formed by a fold that is an integral part of the plate. Therefore, the vane separator according to the present invention is not prone to vibration and is easy to manufacture.

Furthermore, the first liquid collection bag is formed by folding the plate, so that the edges of the first liquid collection bag at the common inlet are curved, thus eliminating sharp edges and reducing droplet breakup.

In a preferred embodiment, the second portion of the flap is folded such that the edge of the second liquid collection bag at the common inlet is also curved to further reduce droplet breakup and increase blade separation device strength.

Preferably, said plurality of z-shaped channels is defined by a plurality of z-shaped plates arranged parallel to each other.

Preferably, a first portion of the fold of the panel is parallel to the first side wall of the z-shaped channel, and a second portion of the fold of the plate is parallel to the second side wall.

Preferably, the second portion of the fin is parallel to the first side wall.

Preferably, the depth of the vane separator is in the range of 3-12 inches, and the depth of the vane separator is the depth of the channel between the farthest point on the left and the farthest point on the right in the direction of airflow. distance.

Embodiment 1: Referring to FIG. 4 , a first embodiment of a double-bag blade separator is shown. A double bag type vane separator for separating liquid from gas comprising a plurality of z-shaped channels 44 defined between a plurality of z-shaped plates 41 arranged parallel to each other, a first liquid collecting bag 42 and a second liquid collecting bag 43. The direction of the arrow marked in the figure indicates the airflow direction. In the z-shaped channel 44 , the second side wall 46 is upstream and adjacent to the first side wall 45 . The first liquid collection bag 42 and the second liquid collection bag 43 are arranged on the first side wall 45 between the crest and the adjacent trough of the z-shaped channel, the first liquid collection bag 42 is opposite to the second liquid collection bag 43 Located on the downstream side of the airflow direction, the common inlet 47 of the first liquid collection bag 42 and the second liquid collection bag 43 is disposed between the peaks and troughs. The first liquid collection bag 42 and the second liquid collection bag 43 form a double bag.

The first liquid collection bag 42 is formed by folding the z-shaped plate 41 such that the edge of the first liquid collection bag 42 at the common inlet 47 is curved.

The folded portion of the Z-shaped plate 41 is composed of a first portion 42a and a second portion 42b. The folded portion of the Z-shaped plate 41 and the first side wall 45 form a first liquid collection bag 42 . The first portion 42a of the folded portion of the Z-shaped plate 41 is parallel to the first side wall 45 . The second portion 42b of the fold of the z-shaped panel 41 extends between the first portion 42a and the first side wall 45 . This second portion 42 b is parallel to the second side wall 46 upstream of the first side wall 45 .

The second liquid collection bag 43 is formed by welding the first portion 43a of the flap to the second side wall 46, wherein the second portion 43b of the flap extends from the first portion 43a of the flap. The second portion 43b of the tab is parallel to the first side wall 45 . The second portion 43b of the tab is in line with the first portion 42a of the fold of the panel.

Example 2: Figure 5 shows a modification based on the embodiment shown in Figure 4, wherein the second part 43b of the flap is folded so that the edge of the second liquid collection bag 43 at the common inlet 47 is an arc Shaped. Other parts of this embodiment are the same as Embodiment 1.

Claims (18)

1. A double bag type vane separator for separating liquid from gas comprising: a plurality of z-shaped channels defined between the plurality of plates, and a first liquid collection bag and a second liquid collection bag, the first liquid collection bag and the second liquid collection bag are arranged on the first side wall between adjacent crests and troughs in the z-shaped channel, The first liquid collection bag is arranged on the downstream side of the second liquid collection bag in the airflow direction, and the first liquid collection bag and the second liquid collection bag are arranged between the adjacent peaks and troughs common entrance, CHARACTERIZED IN THAT at least one of the edge of the first fluid collection bag at the common inlet and the edge of the second fluid collection bag at the common inlet is formed from a fully folded plate such that the At least one of the edge of the first liquid collection bag at the common inlet and the edge of the second liquid collection bag at the common inlet is arc-shaped. 2. The double bag type vane separator according to claim 1, characterized in that the edge of the first liquid collection bag at the common inlet is curved. 3. The double bag type vane separator according to claim 1, wherein the edges of the first liquid collection bag and the second liquid collection bag at the common inlet are both arc-shaped. 4. The double bag vane separator of claim 1, wherein the plurality of z-shaped channels are parallel to each other. 5. The double bag vane separator of claim 4, wherein the plurality of z-shaped channels are defined by a plurality of z-shaped plates arranged parallel to each other. 6. The double bag vane separator of claim 1, wherein said first liquid collection bag is formed by folding said plate such that said first liquid collection bag is at said common inlet The edges are curved. 7. The double bag vane separator of claim 6, wherein a first portion of the fold of the plate is formed by the fully folded plate and is parallel to the z-shaped channel. The first side wall, and the second portion of the folded portion of the panel is parallel to the second side wall of the z-shaped channel, the second side wall is adjacent to the first side wall and located at the first side wall Upstream of one side wall in the direction of airflow. 8. The double-bag vane separator according to any one of claims 1-7, wherein the second liquid collection bag comprises a wing consisting of a first part and a second part, the wing A first portion of the sheet is fixed to a second side wall of the z-shaped channel adjacent to the first side wall and upstream in the direction of air flow of the first side wall, wherein the second side of the fin A portion extends from the first portion of the fin. 9. The dual bag vane separator of claim 8, wherein the second portion of the flap is parallel to the first side wall. 10. The double bag vane separator of claim 8, wherein the second portion of the flap is fully folded such that the edge of the second liquid collection bag at the common inlet is arc. 11. The dual-bag blade separator of claim 1, wherein the depth of the double-bag blade separator ranges from 3 to 12 inches, and the depth of the double-bag blade separator is is the distance of the channel between the farthest point on the left and the farthest point on the right in the airflow direction. 12. A double bag-type vane separator for separating liquid from gas, comprising: a plurality of z-shaped channels defined between the plurality of plates, and a first liquid collection bag and a second liquid collection bag, the first liquid collection bag and the second liquid collection bag are arranged on the first side wall between adjacent crests and troughs in the z-shaped channel, The first liquid collection bag is arranged on the downstream side of the airflow direction of the second liquid collection bag, and the first liquid collection bag and the second liquid collection bag are arranged between the adjacent peaks and the troughs. Common inlet for liquid collection bags, wherein the first fluid collection bag is formed by folding the panel such that the edge of the first fluid collection bag at the common inlet is curved, and the second fluid collection bag is formed by folding The first portion of the fin is welded to the second side wall of the z-shaped channel, the second side wall is located upstream and opposite to the first side wall in the direction of air flow of the first side wall. adjacent, wherein the second portion of the fin extends from the first portion of the fin, wherein the first portion of the fin is shorter than the second sidewall. 13. The double bag vane separator of claim 12, wherein the plurality of z-shaped channels are parallel to each other. 14. The double bag vane separator of claim 13, wherein the plurality of z-shaped channels are defined by a plurality of z-shaped plates arranged parallel to each other. 15. The double bag vane separator of claim 12, wherein a first portion of the fold of the plate is parallel to the first side wall of the z-shaped channel, and the fold of the plate The second portion is parallel to the second side wall. 16. The dual bag vane separator of claim 12, wherein the second portion of the flap is parallel to the first side wall. 17. The dual bag vane separator of claim 12, wherein the second portion of the flap is folded such that the edge of the second liquid collection bag at the common inlet is arc. 18. The dual-bag vane separator of claim 12, wherein the depth of the dual-bag vane separator ranges from 3 to 12 inches, and the depth of the dual-bag vane separator is is the distance of the channel between the farthest point on the left and the farthest point on the right in the airflow direction.