CN107638849B - Natural gas hydrate synthesis reaction kettle - Google Patents
Natural gas hydrate synthesis reaction kettle Download PDFInfo
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- CN107638849B CN107638849B CN201711069665.8A CN201711069665A CN107638849B CN 107638849 B CN107638849 B CN 107638849B CN 201711069665 A CN201711069665 A CN 201711069665A CN 107638849 B CN107638849 B CN 107638849B
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Abstract
The invention discloses a natural gas hydrate synthesis reaction kettle, which mainly comprises a barrel 8, an upper flat cover seal 9, a lower flat cover seal 10, a temperature sensor 12, a pressure sensor 13 and a stirring rod 6, wherein the barrel 8, the upper flat cover seal 9 and the lower flat cover seal 10 are fixedly combined into a reaction kettle body, the upper flat cover seal is provided with a gas inlet and outlet 2, a temperature sensor 12 and a pressure sensor 13, the lower flat cover seal 10 is provided with a liquid outlet 5, and the side wall of the barrel 8 is provided with a liquid inlet 4; the stirring rod 6 and the paddle 7 are arranged in the kettle body, a hollow channel 14 is arranged in the stirring rod, 4-8 air inlets 20 are horizontally distributed at the middle upper part of the stirring rod, the paddle 7 is also of a hollow structure and is communicated with the hollow channel of the stirring rod, and air holes 18 with different diameters are distributed on the back liquid surface of the paddle. The invention has reliable principle and simple and convenient operation, can effectively improve the gas-liquid contact area in the hydration reaction process and the hydration reaction efficiency, and can also be widely applied to the related fields of chemical industry, petroleum and natural gas industry and the like.
Description
Technical Field
The invention relates to a natural gas hydrate synthesis reaction kettle, and belongs to the field of new energy exploitation.
Background
Natural gas hydrate is an ice-like nonstoichiometric cage-like crystalline substance formed by natural gas and water under low-temperature and high-pressure conditions, and is also called as 'combustible ice' because of ignition at normal temperature and normal pressure. At present, the conclusion that scientists in various countries are consistent with the resource amount of the global natural gas hydrate is 2 multiplied by 10 16 m 3 The organic carbon accounts for 53.3% of the total organic carbon, and the sum of the coal, the petroleum and the natural gas accounts for only 26.6%. Therefore, natural gas hydrate is considered as the most important potential energy source in the 21 st century, and has the following characteristics in the face of energy crisis todayHas great attraction.
In nature, natural gas hydrates are mainly distributed in seafloor loose sediments, permafrost region sediments or cracks. In order to scientifically and reasonably develop and utilize the hydrate, a great number of experiments are needed to know the physicochemical characteristics, the hiding mechanism and the like of the hydrate in the sediment, and relevant experimental simulation is carried out on the basis. However, the natural gas hydrate exploitation technology is still immature, and the exploited natural gas hydrate can not meet the requirement of the experimental process, so that related experiments have to be carried out by utilizing artificially synthesized natural gas hydrate. Adding a certain amount of water and sand into a high-pressure low-temperature reaction kettle, then introducing natural gas, stirring to form multiphase flow fluid, and generating the artificially synthesized hydrate after a certain time.
Since sand is a solid, a reaction vessel that can increase the degree of multiphase flow mixing is needed in order to produce an artificial hydrate that is structurally similar to natural hydrates. Meanwhile, because the hydration reaction time is long, in order to shorten the preparation time of the hydrate, a large-capacity reaction kettle is a trend of future development. However, the larger the capacity of the reaction vessel, the greater the difficulty of uniform mixing. Patent CN204522949U, CN204933407U, CN106010698A and CN106268520A all design and put forward the reation kettle that is applicable to artificial natural gas hydrate synthesis, simultaneously, patent CN204522949U still through adding the bubbler at the reation kettle bottom, improves the mixed degree between the heterogeneous fluid in the cauldron, has increased gas-liquid contact area, has shortened the time of gas dissolution. However, the related technology of the hydrate reaction kettle is mostly proposed for promoting the gas-liquid contact efficiency of the gas filling process. Since the hydrate is often generated at the gas-liquid interface, a hydrate film with a certain thickness is easily formed along with the progress of the hydration reaction, and the further progress of the hydration reaction is prevented. How to increase the gas-liquid contact area in the hydration reaction process, avoid the formation of a hydrate film, and solve the key point of slow hydration reaction rate, especially for a large-volume reaction kettle.
Disclosure of Invention
The invention aims to provide a natural gas hydrate synthesis reaction kettle which has reliable principle and simple and convenient operation, can effectively improve the gas-liquid contact area in the hydration reaction process, improves the hydration reaction efficiency, ensures that the hydration reaction is smoothly and efficiently carried out, can be used for synthesizing natural gas hydrate, can be widely used in the related fields of chemical industry, petroleum and natural gas industry and the like, and has wide market prospect.
In order to achieve the technical purpose, the invention provides the following technical scheme.
The invention relates to a natural gas hydrate synthesis reaction kettle which comprises a cylinder body, upper and lower flat cover sealing heads and stirring rods. The upper flat cover sealing head is provided with a gas inlet and a gas outlet, and a temperature and pressure sensor which can acquire the temperature and the pressure of the reaction kettle so as to realize the regulation and control of the synthesis efficiency of the natural gas hydrate; the lower flat cover sealing head is provided with a liquid outlet, and the liquid inlet is arranged on the cylinder wall; the stirring rod is of a hollow structure, the hollow channel is provided with a hole at the middle upper part of the stirring rod, the lower opening is formed in the back liquid surface of the paddle, and the negative pressure formed near the paddle in the stirring process is utilized to enable gas to enter from the gas inlet at the middle upper part of the stirring rod, and the gas is sprayed out from the gas holes on the paddle through the hollow channel, so that the gas can circulate between the gas and the liquid phases, the stirring efficiency is improved, the formation of a hydrate film is avoided, and the problems of small gas-liquid contact area and slow hydration reaction rate in the hydration reaction process are solved.
The utility model provides a natural gas hydrate synthesis reaction kettle, mainly comprises barrel, upper flat cover head, lower flat cover head, temperature sensor, pressure sensor, stirring rod, barrel and upper flat cover head, lower flat cover head pass through flange, bolt and nut fixed combination and become the reaction kettle cauldron body, and upper flat cover head is provided with gas access, temperature sensor, pressure sensor, and lower flat cover head is provided with the liquid export, and the barrel lateral wall is provided with the liquid entry; there is the stirring rod in the cauldron body, and rotor engine is connected to the stirring rod upper end, and the lower extreme passes through the connecting axle and connects the paddle, the stirring rod is hollow structure, and its inside has the cavity passageway, and 4~8 air inlets are being distributed to upper portion level in the stirring rod, the paddle is hollow structure also to be linked together with the cavity passageway of stirring rod, the back of the body liquid level of paddle is like "lotus seedpod" the gas pocket that the distribution diameter is unequal.
The stirring rod is mainly made of copper, and the characteristics of high heat conductivity of copper are utilized, so that on one hand, heat of hydration reaction can be carried out, the hydration reaction is guaranteed, on the other hand, the temperature of the stirring rod is increased, and the generation of hydrate on the stirring rod is avoided to a certain extent, so that a pore channel is blocked.
Waterproof nano materials are coated on the periphery of the air inlet at the middle upper part of the stirring rod, the hollow channel and the blades, so that water molecules are prevented from being adsorbed on the periphery, generation of hydrate in the pore channels of the stirring rod is further inhibited, and generation of hydrate is prevented from blocking the pore channels.
The corners of the hollow channel of the stirring rod are designed to be arc-shaped, so that the smoothness in the pipeline is improved, and the generation of hydrate at the positions is avoided.
And air holes with different diameters are distributed on the back liquid surface of the blade, and the diameters of the air holes are increased along with the increase of the distance from the bottom of the kettle and are reduced along with the decrease of the distance from the bottom of the kettle. The reason is that the closer to the bottom of the kettle, the greater the water pressure around the air holes, and in order to ensure the air injection effect, the diameter of the air holes is reduced to increase the air flow rate.
The reaction kettle adopts alloy steel and stainless steel 316 material anti-corrosion layers, and performs anti-corrosion treatment on the inner cavity of the reaction kettle, the stirring rod and the paddles; in order to reduce the air inlet pressure and improve the gas-liquid contact area, the air inlet mode of the reaction kettle is changed from the air inlet mode of the bottom of the kettle to the air inlet mode of the top of the kettle; in order to improve the gas-liquid contact efficiency of the air inlet process and the hydration reaction process, the stirring rod is started when air is introduced, and due to the centrifugal force in the stirring process, a certain negative pressure is formed near the blade, gas enters from the air inlet on the stirring rod, passes through the hollow channel of the stirring rod, and is sprayed into the liquid phase through the air holes on the blade, so that the gas-liquid contact efficiency is improved.
Compared with the prior art, the invention has the following beneficial effects:
(1) The heat conductivity coefficient of copper is as high as 405W/(m.K), and the copper is used as the main material of the stirring rod, so that the heat generated by the hydration reaction can be timely led out from the reaction kettle, and the hydration reaction is ensured to be carried out;
(2) Air holes with different diameters are distributed on the back liquid surface of the paddle in a shower nozzle mode, and air is sprayed out of the paddle by utilizing negative pressure generated at the paddle during stirring to fully contact with liquid, and compared with single-hole air inlet, the porous air inlet is beneficial to increasing the contact area of air and liquid;
(3) Waterproof nano materials are coated on the vicinity of the air inlet of the stirring rod, the hollow channel of the stirring rod and the blades, so that water molecules are prevented from adhering to the positions, and the blocking of pore channels caused by hydrate formation is avoided;
(4) The corners of the inner pore canal of the stirring rod are designed into arc shapes, so that the pore canal blockage caused by the generation of hydrate at the parts is avoided, and the efficient proceeding of the hydration reaction is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a natural gas hydrate synthesis reaction kettle.
Fig. 2 is a three-view of the blade, (a) is a front view, (b) is a bottom view, and (c) is a top view.
Fig. 3 is a transverse cross-sectional view of the stirring rod.
Fig. 4 is an axial cross-sectional view of the stirring rod.
In the figure: the device comprises a 1-rotor engine, a 2-gas inlet and outlet, a 3-screw cap, a 4-liquid inlet, a 5-liquid outlet, a 6-stirring rod, 7-paddles, an 8-cylinder, a 9-upper flat cover seal head, a 10-lower flat cover seal head, 11-bolts, a 12-temperature sensor, a 13-pressure sensor, a 14-hollow channel in the stirring rod, a 15-flange, a back liquid surface of 16-paddles, a liquid facing surface of 17-paddles, 18-air holes, a 19-connecting shaft and 20-air inlets.
Detailed Description
The invention is further illustrated by the following figures and examples, which are given solely for the purpose of illustration and are not intended to be limiting.
See fig. 1, 2, 3, 4.
The utility model provides a natural gas hydrate synthesis reaction kettle, mainly comprises barrel 8, upper flat cover head 9, lower flat cover head 10, temperature sensor 12, pressure sensor 13, stirring rod 6, barrel 8 and upper flat cover head 9, lower flat cover head 10 pass through flange 15, bolt 11 and nut 3 fixed combination become the reaction kettle cauldron body, upper flat cover head 9 is provided with gas access & exit 2, temperature sensor 12, pressure sensor 13, lower flat cover head 10 is provided with liquid outlet 5, barrel 8 lateral wall is provided with liquid inlet 4 (figure 1); the stirring rod 6 is arranged in the kettle body, the upper end of the stirring rod is connected with the rotor engine 1, the lower end of the stirring rod is connected with the blade 7 through the connecting shaft 19, the stirring rod is of a hollow structure (figure 3), a hollow channel 14 is arranged in the stirring rod, 4-8 air inlets 20 are horizontally distributed at the middle upper part of the stirring rod, the blade 7 is of a hollow structure and is communicated with the hollow channel of the stirring rod, the back liquid surface 16 of the blade is provided with air holes 18 with different diameters like a shower nozzle, and the head-on surface 17 of the blade adopts a traditional structure to ensure stirring efficiency (figure 2).
The corners of the hollow channel 14 of the stirring rod (fig. 4) are designed to be arc-shaped to avoid hydrate formation at these locations.
Example 1:
the hydrate synthesis reaction kettle provided by the invention is used for synthesizing artificial natural gas hydrate by combining a matched pressurizing system, a data acquisition system, a feeding system and the like, the design pressure of the reaction kettle is 20MPa, the design temperature is-15-40 ℃, the internal dimension of the kettle is phi 950mm multiplied by 1200mm, the total volume of a cavity is 850L, the diameter of a water injection hole is 25mm, and the diameter of a stirring rod is 50mm.
The artificial natural gas hydrate is synthesized by using the reaction kettle, and the process is as follows:
firstly adding proper sand into a reaction kettle, buckling an upper flat cover end socket of the reaction kettle, then introducing proper amount of water, starting a stirring rod, refrigerating the reaction kettle, and then adding air into the kettle until the required pressure is reached. In the air-entraining process, the stirring rod is started, part of the gas is sprayed out through the liquid-solid phase through the stirring rod, so that on one hand, the gas-liquid contact area is increased, on the other hand, the impact of the gas promotes the mixing of water and sand, and the uniform multiphase flow forming time in the reaction kettle can be shortened by 20% -40%. Meanwhile, compared with the air inlet at the bottom of the kettle, the stirring rod blade is utilized to jet air, and the air inlet pressure can be reduced by 10% -40%. In the hydration reaction process, the stirring rod can be used for realizing the circulation of gas between gas phase and liquid-solid phase, thereby avoiding the generation of a hydrate film and preventing the normal running of the hydration reaction, enhancing the stirring effect, increasing the contact area of the gas phase and the liquid-solid phase and realizing the efficient running of the hydration reaction.
Claims (3)
1. The utility model provides a natural gas hydrate synthesis reaction kettle, mainly comprises barrel (8), upper flat cover head (9), lower flat cover head (10), temperature sensor (12), pressure sensor (13), stirring rod (6), its characterized in that, barrel (8) and upper flat cover head (9), lower flat cover head (10) are fixed the combination through flange (15), bolt (11) and nut (3) and are the reaction kettle body, upper flat cover head (9) are provided with gas access & exit (2), temperature sensor (12), pressure sensor (13), lower flat cover head (10) are provided with liquid outlet (5), barrel (8) lateral wall is provided with liquid inlet (4); there is stirring rod (6) in the cauldron body, rotor engine (1) is connected to the stirring rod upper end, and paddle (7) are connected through connecting axle (19) to the lower extreme, the stirring rod is hollow structure, and there is hollow channel (14) its inside, hollow channel's turning is the arc, and 4~8 air inlets (20) are distributed to upper portion level in the stirring rod, paddle (7) are hollow structure to be linked together with the hollow channel of puddler, distribute gas pocket (18) that the diameter is unequal on the back of the body level (16) of paddle, the diameter of gas pocket increases along with the increase of distance from the cauldron bottom.
2. A natural gas hydrate synthesis reaction kettle as claimed in claim 1, wherein the stirring rod (6) is mainly made of copper.
3. A natural gas hydrate synthesis reaction kettle as claimed in claim 1, wherein the periphery of the gas inlet (20) of the stirring rod (6), the hollow channel (14) and the blades (7) are coated with waterproof nano materials.
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| CN108671858B (en) * | 2018-08-06 | 2023-06-27 | 西南石油大学 | Quick synthesis device and method for hydrate |
| CN112111309B (en) * | 2020-09-21 | 2021-05-14 | 青岛科技大学 | Concentric double-helix type hydrate continuous reaction device |
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| RU94031665A (en) * | 1994-08-30 | 1996-06-10 | Н.Н. Хазиев | Apparatus for liquid stream division for equal parts by usage |
| JP2008207099A (en) * | 2007-02-27 | 2008-09-11 | Meidensha Corp | Apparatus for generating micro bubble and micro bubble development system |
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