CN102120104B - A device for continuous separation of gas hydrate - Google Patents

Abstract

The invention discloses a device for continuously separating gas hydrate, which comprises an upper box body and a lower box body, wherein the upper box body is a gas collecting cavity (7), the upper end of the upper box body is provided with a separated gas outlet (10), a safety valve port (16) and a pressure meter port (17), and the lower part of the upper box body is provided with a silk screen mist eliminator (6); the lower box body is shaped as a cuboid, the upper part of the lower box body is provided with a hydrate slurry inlet (1), the tail end of the hydrate slurry inlet (1) is provided with a flow equalizing plate (2) in a vertical direction, the bottom end of the flow equalizing plate (2) is provided with a sieve plate (3), the sieve plate (3) is alternatively connected with a drainage plate (4) to form a separating channel; a water collecting cavity (8) is arranged between the separation channel and the lower box body, and the lower part of the separation channel is provided with a separated water outlet (11); and the lower end of the separation channel is connected with a hydrate storing cavity (9), and the bottom end of the hydrate storing cavity (9) is provided with a hydrate outlet. The invention has the advantages of simple structure, small occupation area and convenience for maintenance.

Description

A device for continuous separation of gas hydrate

technical field

The invention belongs to the field of gas, liquid and solid separation devices, in particular to a device for continuous separation of other hydrates.

Background technique

At present, using the unique chemical and physical characteristics of hydrates can develop a series of high-tech, involving water resources, environmental protection, climate, oil and gas storage and transportation, petrochemical, biopharmaceutical and many other fields. Typical examples include hydrate desalination of seawater to make up for the shortage of fresh water resources; hydrate method to permanently store greenhouse gas CO ₂ in the seabed to improve the global climate environment; storage, transportation, and distribution of natural gas in the form of hydrate; hydration Separation of low boiling point gas mixtures (such as ethylene cracked gas, various refinery dry gases and natural gas) by physical method. An important link in the application of these technologies is the separation of gas, water and hydrate. The conditions for the existence of gas hydrates are low temperature and high pressure, so the hydrate separation equipment needs to maintain its internal low temperature and high pressure environment. At present, the separation of hydrates mostly adopts the traditional separator for multi-stage separation process, that is, the gravity sedimentation separation equipment is used to separate the gas and the solid-liquid initial separation, and then the solid-liquid separation equipment is used to further separate the solid-liquid mixture. Because most of the gravity sedimentation separation equipment has the disadvantages of large volume, complex structure, long processing time, poor separation effect, and discontinuous work, the use of various separation equipment in the process will inevitably increase investment costs, operation management and maintenance costs.

Contents of the invention

The object of the present invention is to provide a device capable of continuously separating gas, liquid and solid hydrates, which has a simple structure, a small footprint and convenient maintenance.

The technical solution adopted by the present invention is: a device for continuous separation of gas hydrate, which is composed of an upper box and a lower box, and the box is connected by an upper flange and a lower flange; the upper box is The gas collection chamber is provided with a separation gas outlet, a safety valve port and a pressure gauge port at the upper end, and a wire mesh demister at the lower part; the lower box is in the shape of a cuboid, with a hydrate slurry inlet at its upper There is a vertical flow equalizing plate at the end, and a sieve plate is set at a distance of 8~20mm from the bottom of the flow equalizing plate. The sieve plate is alternately connected with the drainage plate to form a separation channel. The plane where the sieve plate is located is 15~45 degrees from the horizontal plane. Angle; between the separation channel and the lower box is a water collection chamber, the water collection chamber is composed of inner and outer walls, between the two walls is a cooling water chamber, the lower part is provided with a separation water outlet; the upper part of the cooling water chamber is provided with a cooling The water outlet is provided with a cooling water inlet at the lower part; the lower end of the separation channel is connected to a hydrate storage chamber, and a hydrate outlet is provided at the bottom of the hydrate storage chamber.

As a further improvement of the present invention, a baffle is provided at the connection between the sieve plate and the drainage plate, and the plane where it is located forms an angle of 30-45 degrees with the horizontal plane; the sieve plate is a 200-250-mesh stainless steel mesh plate; The flow plate is a rectangular orifice plate, with circular holes with a diameter of 10mm evenly arranged on the plate, and the bottom end of the plate is a semicircular hole.

The present invention has following beneficial effect:

(1) The structure of the device of the present invention is simple, except for the sieve plate and wire mesh demister that need to be inspected regularly, there are no moving parts, wearing parts and supporting parts that need maintenance, and no filter materials are required.

(2) The device of the present invention occupies a small area, is easy to install, and has low operating costs. Compared with the gravity sedimentation separator with the same processing capacity, the volume and weight of the present invention are only equivalent to one tenth of it. At the same time, due to the light weight, no special installation conditions are required, and only simple support and pipeline connections are required to work. Furthermore, the operating costs of the present invention are low compared to conventional cyclone separators.

(3) The device of the present invention is convenient and flexible to use; it can be used alone or in parallel to increase the processing capacity, and can also be used in series to increase the processing depth.

(4) The device of the present invention realizes the simultaneous, efficient and continuous separation of gas, liquid and solid phases in gas hydrate, simplifies the process of separating gas first and then separating solid and liquid in the traditional separation process, saving equipment invest.

Description of drawings

Figure 1 is a schematic diagram of the device structure for continuous separation of gas hydrates;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the B-B sectional view of Fig. 1;

Fig. 4 is a schematic structural view of an equalizer;

Among them: 1- hydrate slurry inlet; 2- equalizer plate; 3- sieve plate; 4- drainage plate; 5- baffle plate; 6- wire mesh demister; ;9-hydrate storage chamber; 10-separated gas outlet; 11-separated water outlet; 12-hydrate outlet; 13-cooling water inlet; 14-cooling water outlet; 15-cooling water cavity; 16-safety valve port; 17-pressure gauge port; 18-the angle between the sieve plate and the horizontal plane; 19-the angle between the baffle plate and the horizontal plane; 20-the upper flange; 21-the lower flange.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Figure 1, a device for continuous separation of gas hydrates consists of an upper box and a lower box, the box is connected by an upper flange 20 and a lower flange 21; the upper box is a gas collection chamber 7. The top is arched, and the upper end is provided with a separation gas outlet 10, a safety valve port 16 and a pressure gauge port 17, and the lower part is provided with a wire mesh demister 6; the lower box is rectangular, and the upper part is provided with a hydrate slurry Inlet 1, the cross section of the hydrate slurry inlet 1 is circular, and the end is provided with a vertical flow equalizer 2, and a sieve plate 3 is set at a distance of 8-20mm from the bottom of the flow equalizer 2, and the three sides of the sieve plate 3 Connected with the lower box, the sieve plate 3 is alternately connected with the drainage plate 4 to form a separation channel, and the plane where the sieve plate 3 is located forms an angle of 15 to 45 degrees with the horizontal plane; between the separation channel and the lower box is a water collection chamber 8. The water collection chamber 8 is composed of inner and outer walls, between the two walls is a cooling water chamber 15, and the lower part is provided with a separated water outlet 11; the upper part of the cooling water chamber 15 is provided with a cooling water outlet 14, and the lower part is provided with a cooling water inlet 13. The lower end of the separation channel is connected to the hydrate storage chamber 9, the hydrate storage chamber 9 is pyramid-shaped, and the bottom end is provided with a hydrate outlet.

The separated gas outlet 10 and the hydrate outlet 12 of the device for continuous separation of gas hydrates are on the same axis as the central lines of the gas collection chamber 7 , water collection chamber 8 and hydrate storage chamber 9 .

Since the gas collection chamber 7 is connected by the upper flange 20 and the lower flange 21, it is convenient to carry out regular inspection on the sieve plate 3 and the wire mesh demister 6 inside the separator after disassembly.

As shown in Figure 3, the section A-A of Figure 1 is rectangular, and the upper end of the gas collection chamber 7 is provided with a separation gas outlet 10, a safety valve port 16 and a pressure gauge port 17; the side of the lower box is provided with a hydrate slurry inlet 1.

As shown in Figure 4, the equalizer plate 2 is a rectangular orifice plate, on which round holes with a diameter of 10mm are uniformly arranged, and the bottom end of the plate is a semicircle hole. The equalizing plate 2 is parallel to the axis, and the distance between the bottom end and the sieve plate 3 is 8-20mm. The sieve plate 3 is a 200-250-mesh stainless steel mesh plate, and the plane where the sieve plate is located forms an angle of 15-45 degrees with the horizontal plane.

The baffle plate 5 is a rectangular stainless steel plate, and the plane where the baffle plate is located forms an angle of 30 to 45 degrees with the horizontal plane. The first function is to change the momentum of the fluid and improve the separation efficiency; the second is to prevent the hydrate slurry from rapidly flowing through the sieve plate 3, thereby failing to achieve the best separation effect.

The working principle of the present invention is: the hydrate slurry is introduced from the hydrate slurry inlet 1, flows evenly through the sieve plate 3 after being divided by the equalizer plate 2, and then impacts the baffle plate 5, due to the different inertias of the gas, liquid, and solid phases , the momentum of the fluid changes suddenly at this time, so the initial pre-separation of gas, liquid and solid occurs at the baffle 5. The free gas in the hydrate slurry flows in the opposite direction of the liquid flow, and the small liquid droplets that have not been separated in the gas flow are separated under gravity and settle on the gas-liquid interface, and some diameters are very small. The liquid droplets that are difficult to separate in the hydrate slurry are further separated by the wire mesh eliminator 6, and the filtered gas gathers in the gas collection chamber 7; most of the free water in the hydrate slurry leaks through the sieve plate 3 and drains along the drainage The plate 4 is collected into the water collection chamber 8; the solid hydrate crystal grains and part of the free water directly fall to the second sieve plate for secondary separation, and so on, flow through the last sieve plate, and the solid hydrate falls to the hydrate Storage chamber 9. The hydrate storage chamber 9 is designed in a pyramid shape to facilitate the export of solid hydrate.

The hydrate separator has two functions of cooling and separation. The cooling water cavity 15 is connected to the external constant temperature water bath through the cooling water inlet 13 and the cooling water outlet 14, and the cooling water inside is maintained at a temperature of 0~3°C, so that the hydrate slurry can further generate hydrate; at the same time, the generated hydrate and the remaining Unreacted gas, and unreacted water are continuously separated. The separated hydrate is led out from the hydrate outlet 12, the separated gas is returned to the gas circulation circuit through the separator outlet 10, and the separated water is returned to the liquid circulation circuit through the separated water outlet 11.

Claims (8)

1. One kind be used for the gas hydrate continuous separate from device, formed by upper box and lower box, be connected 21 by upper flange plate (20) with lower flange between the casing) connect, it is characterized in that: described upper box is air collecting chamber (7), its upper end is provided with separation gas outlet (10), relief valve port (16) and gauge port (17), and the bottom is provided with mesh mist eliminator (6); Described lower box is cuboid, its top is provided with hydrate slurry import (1), this hydrate slurry import (1) end is provided with the homogenizing plate (2) of vertical direction, the distance of this homogenizing plate (2) bottom 8 ~ 20mm arranges sieve plate (3), described sieve plate (3) is by alternately connecting to form split tunnel with drainage plate (4), and sieve plate (3) plane, place becomes 15 ~ 45 degree angles with horizontal plane; Be collect cavity (8) between this split tunnel and the described lower box, this collect cavity (8) is made of inside and outside wall, is cooling water cavity (15) between two walls, and the bottom is provided with Separation of Water outlet (11); Described cooling water cavity (15) top is provided with coolant outlet (14), and the bottom is provided with cooling water inlet (13); The lower end of described split tunnel connects hydrate storage chamber (9), and this hydrate storage chamber (9) bottom is provided with the hydrate outlet.
2. According to claim 1 for the gas hydrate continuous separate from device, it is characterized in that: described sieve plate (3) and drainage plate (4) junction are provided with deflection plate (5), its plane, place becomes 30 ~ 45 to spend angles with horizontal plane.
3. According to claim 1 and 2 for the gas hydrate continuous separate from device, it is characterized in that: described sieve plate (3) is 200 ~ 250 purpose stainless steel web plates.
4. According to claim 1 for the gas hydrate continuous separate from device, it is characterized in that: described homogenizing plate (2) is a rectangle orifice plate, is evenly arranged the circular hole that the aperture is 10mm on the plate, the plate lowermost end is semicircle orifice.
5. According to claim 1 for the gas hydrate continuous separate from device, it is characterized in that: the center line of described separation gas outlet (10), hydrate outlet (12) and air collecting chamber (7), collect cavity (8) and hydrate storage chamber (9) is on same axis.
6. According to claim 1 for the gas hydrate continuous separate from device, it is characterized in that: described hydrate slurry import (1) cross section is for circular.
7. According to claim 1 for the gas hydrate continuous separate from device, it is characterized in that: described hydrate storage chamber (9) is pyramid.
8. According to claim 1 for the gas hydrate continuous separate from device, it is characterized in that: described air collecting chamber (7) top is arch.

Images