CN106268520B - Gas hydrates synthesize Wobble plate type reaction kettle system - Google Patents

Abstract

The invention provides a rocking plate reactor system for natural gas hydrate synthesis. The rocking plate reactor system for natural gas hydrate synthesis includes a reactor and a rocking system. The top of the rocking system is provided with a first jacket and a second jacket. The The swing system is connected with the reaction kettle through the first jacket and the second jacket, and the swing system includes a fixed support rod and a telescopic support rod; the top of the fixed support rod is connected with the first jacket through the first spherical hinge, which can The top of the telescopic support rod is connected with the second jacket through the second spherical hinge; the bottom of the telescopic support rod has a piston, which is arranged in the piston cylinder, and the piston cylinder communicates with the hydraulic oil tank through the hydraulic circuit of the hydraulic pump, and the hydraulic circuit A stop valve and a regulating valve are installed on it. It overcomes the deficiency that the existing hydrate synthesis reactor only adopts a mechanical strengthening effect to enhance the mass transfer and heat transfer effect in the rapid synthesis process of natural gas hydrate.

Description

Natural Gas Hydrate Synthesis Swing Plate Reactor System

technical field

The invention relates to the mechanical field, in particular to a swing plate reactor system for natural gas hydrate synthesis.

Background technique

At present, the rapid synthesis methods of natural gas hydrate at home and abroad mainly include: mechanically enhanced rapid synthesis, chemically enhanced rapid synthesis and rapid synthesis under the action of external field. Among them, the mechanical strengthening effect can realize the rapid synthesis of natural gas hydrate by increasing the gas-liquid contact area and increasing the solubility of gas in water. At present, the mechanical strengthening methods for hydrate synthesis at home and abroad mainly include stirring method, spraying method and bubbling Law.

Stirring method means that the stirring blade rotates to change the gas-liquid contact surface from circular to conical, which increases the gas-liquid contact area, strengthens the mass transfer and heat transfer process, thereby shortens the nucleation time and growth time of hydrate synthesis, and increases the hydration rate; The shower method is to atomize the main body of water through the nozzle, and contact with the gas in the reactor to strengthen the gas-liquid contact area, thereby increasing the hydration reaction rate and promoting the rapid synthesis of hydrate; the bubbling method uses orifice bubbling to increase The atmosphere-liquid contact area enhances the disturbance of gas to liquid, thereby shortening the induction period of gas hydrate formation and promoting the rapid synthesis of gas hydrate.

The above-mentioned mechanical strengthening method for rapid hydrate synthesis only adopts one kind of mechanical strengthening effect to enhance the mass and heat transfer effect in the process of rapid natural gas hydrate synthesis, and does not use the superposition effect of two kinds of mechanical strengthening effects to enhance the process of rapid natural gas hydrate synthesis. heat transfer effect.

Contents of the invention

The object of the present invention is to solve the above-mentioned defects in the prior art, and provide a swing plate reactor system capable of improving the efficiency of natural gas hydrate.

The natural gas hydrate synthesis swing plate reactor system includes a reactor and a swing system. The top of the swing system is provided with a first jacket and a second jacket. The swing system and the reactor pass through the first jacket and the second jacket. The swing system includes a fixed support rod and a telescopic support rod; the top of the fixed support rod is connected to the first jacket through the first spherical hinge, and the top of the telescopic support rod is connected to the second clamp through the second spherical hinge. The sleeves are connected; there is a piston at the bottom of the telescopic support rod, and the piston is arranged in the piston cylinder. The piston cylinder communicates with the hydraulic oil tank through the hydraulic circuit of the hydraulic pump, and a shut-off valve and a regulating valve are installed on the hydraulic circuit.

A displacement sensor is installed on the telescopic support rod.

The reaction kettle includes a cylinder body and a plurality of sieve plates, and the two ends of the cylinder body are respectively connected to the inlet flat cover head and the outlet flat cover head through the cylinder body flange and bolts; the inlet flat cover seal The head is provided with a gas inlet, a temperature sensor, a pressure sensor, and a liquid inlet; the outlet flat cover head is provided with a liquid outlet and a gas outlet; the sieve plate is vertically arranged inside the reactor, and the sieve plate The center is installed on the shaft, and the sieve plate and the shaft are fixed through a key connection.

The sieve plate has sieve holes, and there is a notch on the edge of the sieve plate, and multiple sieve plates are installed in parallel on the shaft, and the notches are staggered for installation.

The natural gas hydrate synthesis swing plate reactor system provided by the present invention can adjust the synthesis efficiency of natural gas hydrate according to the obtained temperature and pressure because temperature sensors and pressure sensors are installed on the reactor body. And the swing system overcomes the deficiency that the existing hydrate synthesis reactor only adopts a kind of mechanical strengthening effect to enhance the mass transfer and heat transfer effect in the rapid synthesis of natural gas hydrate.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of reactor of the present invention;

Fig. 3 is a schematic diagram of the structure of the sieve plate of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the following technical solutions in the present invention are clearly and completely described. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As shown in Figure 1, the rocking plate reactor system for natural gas hydrate synthesis includes a reactor 5 and a rocking system 15, and the top of the rocking system 15 is provided with a first jacket 6-1 and a second jacket 6-2, so The swing system 15 is connected to the reaction kettle 5 through the first jacket 6-1 and the second jacket 6-2. The swing system 15 includes a fixed support rod 1 and a telescopic support rod 8; the top of the fixed support rod 1 passes through The first spherical hinge 2-1 is connected with the first jacket 6-1, and the top of the telescopic support rod 8 is connected with the second jacket 6-2 through the second spherical hinge 2-2; the telescopic support There is a piston 9 at the bottom of the rod 8, and the piston 9 is arranged in the piston cylinder 10. The piston cylinder 10 communicates with the hydraulic oil tank 14 through the hydraulic circuit of the hydraulic pump 13, and the shut-off valve 12 and the regulating valve 11 are installed on the hydraulic circuit.

A displacement sensor 7 is installed on the telescopic support rod 8 .

As shown in Figure 2, the reaction kettle 5 includes a cylinder body 5-1 and a plurality of sieve plates 3, and the two ends of the cylinder body 5-1 are respectively connected to the inlet flat cover head by the cylinder body flange and bolts. 5-2 and the outlet flat head 5-3; the inlet flat head 5-2 is provided with a gas inlet 5-4, a temperature sensor 5-5, a pressure sensor 5-6, and a liquid inlet 5- 9; The outlet flat cover head 5-3 is provided with a liquid outlet 5-8 and an air outlet 5-7; the sieve plate 3 is vertically arranged inside the reaction kettle 5, and the center of the sieve plate 3 is installed on the On the shaft 4, the sieve plate 3 and the shaft 4 are fixed through a key connection.

As shown in FIG. 3 , there are sieve holes on the sieve plate 3 , and there is a notch on the edge of the sieve plate 3 , and a plurality of sieve plates 3 are installed in parallel on the shaft 4 , and the notches are staggered for installation.

The sieve plate 3 is fixed by the shaft 4 and placed in the reactor body of the reaction kettle 5, and the synthesis of natural gas hydrate is accelerated through the sieve plate 3 .

A swing system 15 is installed on the barrel 5-1 of the reaction kettle 5. The swing system 15 is powered by a hydraulic pump, etc., and drives the barrel 5-1 to move through the telescopic support rod 8 to accelerate the synthesis of natural gas hydrate.

The reaction kettle 5 is the core equipment of the hydrate preparation system. It is a horizontal type III pressure vessel, and the kettle body is wrapped by a heat exchange jacket for refrigeration; the sieve plate 3 is fixed on the shaft 4, and the two ends of the shaft 4 are not fixed. Instead, it is close to the walls at both ends to prevent collision with the kettle body during the swing. Reactor 5 is mainly used in conjunction with swing system 15 to realize the function of rapid synthesis.

The reactor design parameters are as follows:

Design pressure: 16MPa

Design temperature: -15～40℃

Kettle body size: Φ308×430(mm)

Total cavity volume: 5L

Maximum working pressure: 12MPa

Working temperature: 0℃～30℃

Hydraulic test pressure: 20MPa

Working medium: water and natural gas, chemical reagents, etc.

Main material: 0Cr18Ni10Ti or alloy steel plus stainless steel 316 anti-corrosion layer

Design life: 30 years.

The sieve holes on the sieve plate 3 in the reactor have different sizes and are arranged according to certain rules. When the reaction kettle 5 is swinging up and down, the liquid in the reaction kettle 5 forms liquid droplets through the holes of different sizes on the sieve plate 3 and drops downward, and the gas in the kettle rises through the holes on the sieve plate 3 to form Air bubbles, which achieve the effect of a bubbling reactor; during the up and down swing motion of the reactor 5, the liquid in the kettle moves violently, thereby achieving the effect of a stirred reactor. Notches and holes with different diameters are set on the sieve plate 3. The purpose is that when the smaller diameter holes are blocked by hydrate particles, the liquid can flow from the larger diameter holes or gaps to the next sieve plate to enhance turbulent flow. , Strengthen mass transfer, increase the effect of the process.

The design parameters of the sieve plate are as follows:

Design pressure: 16MPa

Design temperature: -15～40℃

Sieve plate size: Φ150×20(mm)

Maximum working pressure: 12MPa

Working temperature: 0℃～30℃

Hydraulic test pressure: 20MPa

Working medium: water and natural gas, chemical reagents, etc.

Main material: 0Cr18Ni10Ti or alloy steel plus stainless steel 316 anti-corrosion layer

Design life: 30 years.

The reaction kettle 5 is fixed on the swing system 15 through a jacket. The rocking motion of the reactor 5 is powered by the hydraulic pump 13, and the hydraulic pump 13 squeezes the piston 9 to move upward by inputting the hydraulic oil into the bottom of the piston 9; when the telescopic support rod 8 reaches the highest point, the stop valve 12 is closed, and Part of the gravity of the reaction kettle 5, the gravity of the telescopic support rod 8 and the gravity of the hydraulic oil provide power to squeeze the hydraulic oil into the hydraulic oil tank 14, and control the output speed of the hydraulic oil through the regulating valve 11, thereby controlling the telescopic support. The descending speed of rod 8. When the reactor 5 reaches the highest point or the lowest point, it needs to stay for a period of time to ensure that the liquid can completely drop to the bottom to complete the process of full contact between the liquid and the gas. The control of the hydraulic pump 13, the shut-off valve 12 and the regulating valve 11 is all fed back to the system through the data collected by the displacement sensor 7, and the automatic control is realized through computer processing.

The kettle body is made of 304 austenitic stainless steel, the design pressure is 12Mpa, and the inside of the kettle is a high-pressure gas-liquid two-phase medium. The design process adopts the conventional pressure vessel design method, which conforms to the technical regulations of GB150-98 "Steel Pressure Vessel", and the main content of the design Including kettle body design, flange design, seal design, strength check and hydrostatic test.

Through the research on the thermodynamics of natural gas hydrate, it is found that low temperature and high pressure are necessary conditions for maintaining natural gas hydrate. The design of the hydration reactor meets the experimental requirements in the process of natural gas hydrate formation. The reactor of the present invention has low energy consumption, simple structure, compact design, easy installation, and convenient operation and maintenance. Crystallization and solidification under pressure and temperature provide experimental conditions for the rapid synthesis of natural gas hydrate.

The Q345R steel plate of the main container of the present invention is supplied, inspected and accepted in the normalizing state according to GB713-2014 "Steel Plates for Boiler and Pressure Vessels", and ultrasonic testing should be carried out, and the qualified level is not lower than the II level of the JB/T4730.3-2005 standard ;The 16Mn forgings used for flat cover clamps should meet the requirements of NB/T47008-2010 "Carbon Steel and Alloy Steel Forgings for Pressure Equipment", and the grade III is qualified.

According to the structure of the high-pressure synthesis kettle, the airtightness of methane gas and the requirements of the experiment function, the seal of the high-pressure synthesis kettle adopts a self-tightening sealing structure. Self-tightening seals include double cone ring seals, Wood seals, C-ring seals, O-ring seals, triangular pad seals, O-ring seals, etc. The high-pressure synthesis kettle of the present invention adopts fluorine rubber "O" ring, which is low in manufacturing cost and easy to use, resistant to chemical media and carbon dioxide gas, resistant to extrusion and gas explosion. There are two fluorine rubber "O" rings between the kettle body and the kettle cover. The cross-sectional diameter of the sealing ring is 18mm, and the sealing groove is 15mm deep and 20mm wide. They are installed in the radial and axial directions respectively. The sealing structure is simple and the sealing effect is excellent. Well, after alignment, it can be loaded by the weight of the lid of the kettle.

Since the surface of the inner cavity of the high-pressure synthesis kettle will come into contact with the medium in the kettle (seawater, methane, chemical agents, etc., which are corrosive), it needs to be treated with anticorrosion to ensure the performance and service life of the high-pressure synthesis kettle. Wet parts such as the surface of the inner cavity of the synthesis kettle, the inner surface of the head, and the holes in contact with the medium adopt a special process to melt the Monel 400 alloy anti-corrosion layer. The structure of Monel 400 alloy is a high-strength single-phase solid solution. It is a corrosion-resistant alloy with the largest amount, the widest application and excellent comprehensive performance. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas medium, and also has excellent corrosion resistance to hot concentrated lye. It is also resistant to neutral solutions.

Reaction kettle design requirements: The design inner diameter of the kettle body is 150mm, the wall thickness is 8mm, the design thickness of the flat cover is 48mm, the hydraulic test pressure is 15Mpa, the reaction kettle adopts a detachable connection structure, and the flange strength and rigidity check meets the test requirements. Require.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (2)

1. Natural gas hydrate synthesis rocking plate reactor system, is characterized in that, comprises reactor (5) and rocking system (15), and described rocking system (15) top is provided with the first jacket (6-1) and the first Two jackets (6-2), described rocking system (15) is connected with reactor (5) by first jacket (6-1), second jacket (6-2), described rocking system (15) ) includes a fixed support rod (1) and a telescopic support rod (8); the top of the fixed support rod (1) is connected with the first jacket (6-1) through the first spherical hinge (2-1), and the telescopic The top of the type support rod (8) is connected with the second jacket (6-2) through the second spherical hinge (2-2); the bottom of the telescopic support rod (8) has a piston (9), and the piston (9 ) is arranged in the piston cylinder (10), and the piston cylinder (10) communicates with the hydraulic oil tank (14) through the hydraulic pump (13) hydraulic circuit, and the shut-off valve (12) and the regulating valve (11) are installed on the hydraulic circuit; A displacement sensor (7) is installed on the telescopic support rod (8); The reaction kettle (5) includes a cylinder (5-1) and a plurality of sieve plates (3), and the two ends of the cylinder (5-1) are respectively connected to the inlet flat cover through the cylinder flange and bolts Seal head (5-2) and outlet flat cover seal head (5-3); Described inlet flat cover seal head (5-2) is provided with gas inlet (5-4), temperature sensor (5-5) , pressure sensor (5-6), liquid inlet (5-9); said outlet flat cover head (5-3) is provided with liquid outlet (5-8), gas outlet (5-7); The sieve plate (3) is vertically arranged inside the reactor (5), the center of the sieve plate (3) is installed on the shaft (4), and the sieve plate (3) and the shaft (4) are connected by a key The connection is fixed. 2. natural gas hydrate synthesis rocking plate reactor system according to claim 1, is characterized in that, sieve hole is arranged on described sieve plate (3), and there is a breach on sieve plate (3) edge, and multi-sheet sieve plate ( 3) Installed in parallel on the shaft (4), with the gaps staggered for installation.