CN111810096A - Automatic microwave stirring, heating and decomposing device for natural gas hydrate and using method thereof - Google Patents
Automatic microwave stirring, heating and decomposing device for natural gas hydrate and using method thereof Download PDFInfo
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- CN111810096A CN111810096A CN202010690110.0A CN202010690110A CN111810096A CN 111810096 A CN111810096 A CN 111810096A CN 202010690110 A CN202010690110 A CN 202010690110A CN 111810096 A CN111810096 A CN 111810096A
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- natural gas
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- gas hydrate
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
- E21B21/066—Separating solids from drilling fluids with further treatment of the solids, e.g. for disposal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/04—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
Abstract
The invention relates to a natural gas hydrate automatic microwave stirring, heating and decomposing device and a using method thereof, which are characterized in that a microwave stirring and heating cavity and a microwave emitter are fixedly arranged in a metal shell, and a stirring device is arranged in the microwave stirring and heating cavity; the inlet of the microwave stirring and heating cavity is connected with a natural gas hydrate conveying device through a first electromagnetic switch, a flow sensor and a first centrifugal pump in sequence; the outlet of the microwave stirring and heating cavity is connected with the inlet of the gas-liquid-solid three-phase separator through a temperature sensor and a second electromagnetic switch in sequence; the bottom outlet of the gas-liquid-solid three-phase separator is respectively connected with a nylon collecting cylinder and a rock debris collecting cylinder through a fluidized bed dryer, and the top outlet of the gas-liquid-solid three-phase separator is connected with a gas storage tank through a second centrifugal pump; the controller is respectively and electrically connected with the microwave emitter, the stirring device, the first electromagnetic switch, the second electromagnetic switch, the flow inductor and the temperature inductor, and the device can be widely applied to the field of hydrate exploitation.
Description
Technical Field
The invention relates to a heating decomposition device and a using method thereof, in particular to an automatic microwave stirring heating decomposition device for natural gas hydrate and a using method thereof, belonging to the field of hydrate exploitation.
Background
Conventional petroleum and natural gas resources stored in the world are consumed greatly, are exhausted quickly, have serious influence on the environment, and the requirement for commercial development of novel clean energy is urgent. The energy generated by the combustion of the combustible ice is tens of times more than that of coal, petroleum and natural gas, no residue is generated after the combustion, the pollution problem which is most painful for people is avoided, and scientists obtain the combustible ice and call the combustible ice as the energy source in the future. The reserves of the global natural gas hydrates are twice of the reserves of the existing natural gas and oil, and the natural gas hydrates have wide development prospects, the natural gas hydrates are found and exploited in the respective sea areas in the countries of the United states, Japan and the like, and according to measurement and calculation, the resource quantity of the natural gas hydrates in south China sea is 700 hundred million tons of oil equivalent, which is about half of the total quantity of the resources of the oil and the natural gas on the land in China.
The existing natural gas hydrate exploitation method for combustible ice comprises a thermal excitation exploitation method, a depressurization exploitation method, a chemical reagent injection exploitation method, a carbon dioxide replacement method and a solid fluidization exploitation method. When the mined seabed natural gas hydrate is transported to the sea level, the solid phase volume percentage of the hydrate slurry is large, so that the resistance of hydrate pipeline transportation is increased, the production efficiency is reduced, the slurry has high viscosity, is easy to adhere to the pipe wall to cause pipe cleaning difficulty, even possibly block the pipeline, and the energy utilization rate is low. However, there is no device or method in the prior art that can solve the problem of hydrate pipeline transportation resistance.
Disclosure of Invention
In view of the above problems, the present invention aims to provide an automatic microwave stirring, heating and decomposing apparatus for natural gas hydrate, which has a high energy utilization rate and can solve the problem of hydrate pipeline transportation resistance, and a method for using the same.
In order to achieve the purpose, the invention adopts the following technical scheme: the automatic microwave stirring, heating and decomposing device for the natural gas hydrate comprises a metal shell, a microwave stirring and heating cavity, a microwave emitter, a stirring device, a gas-liquid-solid three-phase separator, a fluidized bed dryer, a gas storage tank and a controller; the microwave stirring and heating cavity and the microwave emitter are fixedly arranged in the metal shell, the microwave emitter is used for emitting microwaves to the microwave stirring and heating cavity, and the stirring device is arranged in the microwave stirring and heating cavity; the inlet of the microwave stirring and heating cavity is connected with a natural gas hydrate conveying device through a first electromagnetic switch, a flow sensor and a first centrifugal pump in sequence, and the flow sensor is used for sensing the flow of the natural gas hydrate entering the microwave stirring and heating cavity in real time; the outlet of the microwave stirring and heating cavity is connected with the inlet of the gas-liquid-solid three-phase separator through a temperature sensor and a second electromagnetic switch in sequence, and the temperature sensor is used for sensing the temperature of the natural gas hydrate leaving the microwave stirring and heating cavity in real time; the bottom outlet of the gas-liquid-solid three-phase separator is respectively connected with a nylon collecting cylinder and a rock debris collecting cylinder through the fluidized bed dryer, and the top outlet of the gas-liquid-solid three-phase separator is connected with the gas storage tank through a second centrifugal pump; the controller is respectively and electrically connected with the microwave emitter, the stirring device, the first electromagnetic switch, the second electromagnetic switch, the flow inductor and the temperature inductor.
Furthermore, the shell of the microwave stirring heating cavity is sequentially provided with a wave-transparent heat-insulating layer, a wave-absorbing heating layer and a reverse wave heat-transfer metal layer from outside to inside.
Furthermore, the wave-transparent heat-insulating layer is made of ceramic fiber cotton.
Further, the microwave absorbing heating layer fixes microwave absorbing material powder on the surface of the metal by adopting a plasma spraying method.
Further, the reverse wave heat transfer metal layer is made of aluminum, aluminum alloy or stainless steel.
Further, the stirring device comprises a rotating shaft cylinder, a stirring rod, a speed reducer and a rotating motor; through holes for inserting the rotating shaft cylinder are formed in the tops of the metal shell and the microwave stirring and heating cavity, the rotating shaft cylinder is longitudinally arranged in the microwave stirring and heating cavity, a plurality of stirring rods are transversely and uniformly arranged on the rotating shaft cylinder, and one end of the rotating shaft cylinder penetrates through the through holes and is fixedly connected with the output end of the rotating motor through the speed reducer; the rotating motor is also electrically connected with the controller.
Furthermore, a switch control module, a stirring control module and a microwave control module are arranged in the controller; the switch control module is used for controlling the first electromagnetic switch to be switched on or switched off according to the flow sensed by the flow sensor in real time and a preset flow threshold value, and controlling the second electromagnetic switch to be switched on or switched off according to the temperature sensed by the temperature sensor in real time and a preset temperature threshold value; the stirring control module is used for controlling the power of the rotating motor and the on or off of the rotating motor; the microwave control module is used for controlling the output power of the microwave emitter and the on or off of the microwave emitter.
Further, the fluidized bed dryer adopts a vibrating fluidized bed dryer.
A use method of an automatic microwave stirring, heating and decomposing device for natural gas hydrates comprises the following steps: 1) starting the first centrifugal pump, controlling a first electromagnetic switch to be turned on by a controller and starting a microwave emitter and a stirring device, enabling the natural gas hydrate to enter a microwave stirring and heating cavity through a flow sensor under the action of the first centrifugal pump, and sensing the flow of the natural gas hydrate entering the microwave stirring and heating cavity in real time by the flow sensor; 2) the microwave generated by the microwave emitter is dispersed by the waveguide, passes through the wave-transparent heat-insulating layer of the microwave stirring heating cavity and is absorbed by the wave-absorbing heating layer, the wave-absorbing heating layer after absorbing the microwave rapidly heats and rapidly transfers heat to the reverse wave heat-transfer metal layer, and the outward heat transfer is blocked by the wave-transparent heat-insulating layer; 3) the stirring device is used for stirring the natural gas hydrate in the microwave stirring heating cavity, so that the heat energy on the reverse wave heat transfer metal layer is quickly and uniformly transferred to the natural gas hydrate in the microwave stirring heating cavity; 4) the flow sensor senses the flow of the natural gas hydrate entering the microwave stirring and heating cavity in real time, and the controller controls the first electromagnetic switch to be turned off when the flow of the natural gas hydrate reaches a preset flow threshold value; 5) the temperature sensor senses the temperature of the natural gas hydrate leaving the microwave stirring heating cavity in real time, when the temperature of the natural gas hydrate is higher than a preset temperature threshold value, the controller controls the microwave emitter and the rotating motor to be turned off and the second electromagnetic switch to be turned on, and the natural gas hydrate enters the gas-liquid-solid three-phase separator; 6) the gas-liquid-solid three-phase separator is used for carrying out gas-liquid-solid three-phase separation on the natural gas hydrate, and the separated liquid phase and the separated solid phase enter a fluidized bed dryer for drying to obtain nylon and rock debris, and the nylon and the rock debris respectively enter a nylon collecting cylinder and a rock debris collecting cylinder; 7) the separated gas phase enters a gas storage tank under the action of a second centrifugal pump.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the controller can control the heating of the microwave heater and the mechanical stirring of the stirring device to be carried out simultaneously, so that the natural gas hydrate mixture which is just drilled can be effectively heated, methane gas is released, silt is directly reinjected at the seabed, and the energy utilization rate and the mining efficiency are improved.
2. Compared with the traditional heating element, the microwave heating element has the advantages that the effective heating area can be large or small, the microwave heating element is easy to manufacture and adjust, different heating areas can be selected according to different using conditions, so that the heating efficiency is greatly improved, the energy is saved, meanwhile, the microwave heating element belongs to non-contact heating, the service life is long, the failure problems of fusing, breaking and the like easily caused by the traditional heating element are avoided, and the safety is good.
3. The microwave stirring heating cavity is arranged in the metal shell, so that the microwave emitted by the microwave emitter can be reflected, the microwave leakage is prevented, and the problem of hydrate pipe conveying resistance can be solved because the centrifugal pumps are arranged on the input pipeline and the output pipeline.
4. The shell of the microwave stirring heating cavity adopts the wave-transparent heat-insulating layer, the wave-absorbing heating layer and the reverse wave heat-transfer metal layer which are sequentially arranged from outside to inside, the wave-absorbing heating layer can absorb microwaves emitted by the microwave emitter and rapidly generate heat, the reverse wave heat-transfer metal layer can absorb inward heat transfer of the wave-absorbing heating layer and rapidly and uniformly transfer the heat transfer to the natural gas hydrate in the microwave stirring heating cavity, the energy conversion and transfer process of electric energy → microwave energy → heat transfer is realized, and the wave-transparent heat-insulating layer can block the outward heat transfer of the wave-transparent heat-insulating layer.
5. The invention has simple structure, firmness and durability, low manufacturing cost, safety and controllability, high thermal efficiency, convenient installation and easy maintenance, can realize the continuous heating decomposition of the natural gas hydrate in the shallow layer of the seabed, and can be widely applied to the technical field of hydrate exploitation.
Drawings
FIG. 1 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 2 is a schematic cross-sectional view of a microwave agitation heating chamber in the apparatus of the present invention;
FIG. 3 is a schematic representation of the output power of the microwave emitter in the apparatus of the present invention as a function of hydrate dissociation time;
FIG. 4 is a schematic diagram showing the relationship between the power of the rotating motor and the hydrate decomposition time in the device of the present invention.
Detailed Description
The present invention is described in detail below with reference to the attached drawings. It is to be understood, however, that the drawings are provided solely for the purposes of promoting an understanding of the invention and that they are not to be construed as limiting the invention. In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the automatic microwave stirring, heating and decomposing device for natural gas hydrates provided by the invention comprises a rectangular metal shell 1, a microwave stirring and heating cavity 2, a microwave emitter 3, a stirring device 4, an input pipeline 5, an output pipeline 6, a first electromagnetic switch 7, a second electromagnetic switch 8, a flow sensor 9, a first centrifugal pump 10, a second centrifugal pump 11, a temperature sensor 12, a gas-liquid-solid three-phase separator 13, a fluidized bed dryer 14, a nylon collecting cylinder 15, a rock debris collecting cylinder 16, an air storage tank 17 and a controller 18.
The import has been seted up on one side upper portion of microwave stirring heating chamber 2, the one end of access connection input port pipeline 5, the other end of input port pipeline 5 is worn out rectangle metal casing 1 and is connected natural gas hydrate conveyor through first electromagnetic switch 7, flow inductor 9 and first centrifugal pump 10 in proper order, and flow inductor 9 is used for the real-time induction to get into the flow of natural gas hydrate in microwave stirring heating chamber 2, and first centrifugal pump 10 is used for carrying natural gas hydrate to microwave stirring heating chamber 2. The export has been seted up to the opposite side of microwave stirring heating chamber 2, the one end of exit linkage delivery outlet pipeline 6, the other end of delivery outlet pipeline 6 is worn out rectangular metal casing 1 and is connected the import of gas-liquid-solid three-phase separator 13 through temperature-sensing ware 12 and second electromagnetic switch 8 in proper order, and temperature-sensing ware 12 is used for the temperature of the gas hydrate who leaves microwave stirring heating chamber 2 in real time induction, and gas-liquid-solid three-phase separator 13 is used for carrying out gas-liquid-solid three-phase separation to the gas hydrate who leaves microwave stirring heating chamber 2. The bottom outlet of the gas-liquid-solid three-phase separator 13 is respectively connected with a nylon collecting cylinder 15 and a rock debris collecting cylinder 16 through a fluidized bed dryer 14, and the fluidized bed dryer 14 is used for drying and screening separated solid particles in a fluidized state to obtain nylon and rock debris. The top outlet of the gas-liquid-solid three-phase separator 13 is connected with a gas storage tank 17 through a second centrifugal pump 11, and the second centrifugal pump 11 is used for conveying the natural gas after gas-liquid-solid three-phase separation to the gas storage tank 17.
The controller 18 is electrically connected with the microwave emitter 3, the stirring device 4, the first electromagnetic switch 7, the second electromagnetic switch 8, the flow sensor 9 and the temperature sensor 12 respectively.
In a preferred embodiment, as shown in fig. 2, the shell of the microwave stirring and heating chamber 2 is sequentially provided with a wave-transparent heat-insulating layer 2-1, a wave-absorbing heat-generating layer 2-2 and a reverse wave heat-transfer metal layer 2-3 from outside to inside, wherein the wave-transparent heat-insulating layer 2-1 can be made of ceramic fiber cotton allowing microwaves to smoothly pass through, such as aluminum silicate fibers, quartz fibers or high-alumina silicate fibers; the wave-absorbing heating layer 2-2 can adopt a plasma spraying method to fix microwave absorbing material powder such as C powder, SiC powder or CuO powder on the surface of metal; the reverse wave heat transfer metal layer 2-3 can adopt aluminum, aluminum alloy or stainless steel with good heat conductivity.
In a preferred embodiment, the stirring device 4 includes a rotary shaft 4-1, a stirring rod 4-2, a speed reducer 4-3, and a rotary motor 4-4. The top parts of the rectangular metal shell 1 and the microwave stirring and heating cavity 2 are respectively provided with a through hole for inserting a rotary shaft barrel 4-1, the rotary shaft barrel 4-1 is longitudinally arranged in the microwave stirring and heating cavity 2, a plurality of stirring rods 4-2 are transversely and uniformly arranged on the rotary shaft barrel 4-1, and one end of the rotary shaft barrel 4-1 penetrates through the through holes at the top parts of the rectangular metal shell 1 and the microwave stirring and heating cavity 2 and is fixedly connected with the output end of a rotary motor 4-4 through a speed reducer 4-3. The rotary electric machine 4-4 is also electrically connected to the controller 18.
In a preferred embodiment, the fluidized bed dryer 14 may be a vibrating fluidized bed dryer.
In a preferred embodiment, the controller 18 may be a computer, and a switch control module, a stirring control module and a microwave control module are disposed in the controller 18. The switch control module is used for controlling the first electromagnetic switch 7 to be switched on or switched off according to the flow sensed by the flow sensor 9 in real time and a preset flow threshold, and controlling the second electromagnetic switch 8 to be switched on or switched off according to the temperature sensed by the temperature sensor 12 in real time and a preset temperature threshold. The stirring control module is used for controlling the power of the rotating motor 4-4 and the on or off of the rotating motor 4-4. The microwave control module is used for controlling the output power of the microwave emitter 3 and the on or off of the microwave emitter 3.
The use method of the automatic microwave stirring heating decomposition device for the natural gas hydrate is described in detail by the following specific examples:
1) when the microwave stirring heating of the natural gas hydrate is needed, the first centrifugal pump 10 is started, the controller 18 controls the first electromagnetic switch 7 to be switched on and the microwave emitter 3 and the rotating motor 4-4 to be switched on, the natural gas hydrate obtains enough power under the action of the first centrifugal pump 10 and enters the microwave stirring heating cavity 2 through the flow sensor 9, and the flow sensor 9 senses the flow of the natural gas hydrate entering the microwave stirring heating cavity 2 in real time.
2) The microwave generated by the magnetron on the microwave emitter 3 is dispersed by waveguide, passes through the wave-transparent heat-insulating layer 2-1 of the microwave stirring heating cavity 2 and is absorbed by the wave-absorbing heat-generating layer 2-2, the wave-absorbing heat-generating layer 2-2 after absorbing the microwave rapidly generates heat, the heat is rapidly transferred to the reverse wave heat-transfer metal layer 2-3, and the outward heat transfer is blocked by the wave-transparent heat-insulating layer 2-1.
3) The rotary shaft barrel 4-1 starts to rotate under the action of the rotary motor 4-4 and the speed reducer 4-3 to stir the natural gas hydrate in the microwave stirring and heating cavity 2, so that the heat energy on the reverse wave heat transfer metal layer 2-3 is quickly and uniformly transferred to the natural gas hydrate in the microwave stirring and heating cavity 2 to realize quick heating.
4) The flow sensor 9 senses the flow of the natural gas hydrate entering the microwave stirring and heating chamber 2 in real time, and when the flow of the natural gas hydrate reaches a preset flow threshold value, the controller 18 controls the first electromagnetic switch 7 to be turned off.
5) The temperature sensor 12 senses the temperature of the natural gas hydrate leaving the microwave stirring and heating cavity 2 in real time, when the temperature of the natural gas hydrate is higher than a preset temperature threshold value, the controller 18 controls the microwave emitter and the rotating motor 4-4 to be turned off and the second electromagnetic switch 8 to be turned on, and the natural gas hydrate enters the gas-liquid-solid three-phase separator 13.
6) The gas-liquid-solid three-phase separator 13 performs gas-liquid-solid three-phase separation on the natural gas hydrate, and the separated liquid phase and solid phase enter the fluidized bed dryer 14 to be dried to obtain nylon and rock debris, and the nylon and rock debris respectively enter the nylon collecting cylinder 15 and the rock debris collecting cylinder 16.
7) The separated gas phase enters the gas storage tank 17 under the action of the second centrifugal pump 11.
As shown in fig. 3, the controller 18 controls the output power of the microwave emitter 3 to be increased from 400MHZ, 800MHZ, 1200MHZ, 1600MHZ and 2000MHZ in sequence, and repeats the steps, and it can be seen that as the output power of the microwave emitter is increased, the time required for decomposing the natural gas hydrate is gradually reduced, and the reduction rate is faster as the power is increased.
As shown in fig. 4, the controller 18 controls the power of the rotating electrical machine 4-4 to be increased from 1KW, 2KW, 3KW and 4KW in sequence, and repeats the above steps, it can be seen that as the power of the rotating electrical machine 4-4 increases, the time required for decomposing the natural gas hydrate gradually decreases, and the rate of decrease increases with increasing power increases.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (9)
1. The automatic microwave stirring, heating and decomposing device for the natural gas hydrate is characterized by comprising a metal shell, a microwave stirring and heating cavity, a microwave emitter, a stirring device, a gas-liquid-solid three-phase separator, a fluidized bed dryer, a gas storage tank and a controller;
the microwave stirring and heating cavity and the microwave emitter are fixedly arranged in the metal shell, the microwave emitter is used for emitting microwaves to the microwave stirring and heating cavity, and the stirring device is arranged in the microwave stirring and heating cavity;
the inlet of the microwave stirring and heating cavity is connected with a natural gas hydrate conveying device through a first electromagnetic switch, a flow sensor and a first centrifugal pump in sequence, and the flow sensor is used for sensing the flow of the natural gas hydrate entering the microwave stirring and heating cavity in real time; the outlet of the microwave stirring and heating cavity is connected with the inlet of the gas-liquid-solid three-phase separator through a temperature sensor and a second electromagnetic switch in sequence, and the temperature sensor is used for sensing the temperature of the natural gas hydrate leaving the microwave stirring and heating cavity in real time; the bottom outlet of the gas-liquid-solid three-phase separator is respectively connected with a nylon collecting cylinder and a rock debris collecting cylinder through the fluidized bed dryer, and the top outlet of the gas-liquid-solid three-phase separator is connected with the gas storage tank through a second centrifugal pump;
the controller is respectively and electrically connected with the microwave emitter, the stirring device, the first electromagnetic switch, the second electromagnetic switch, the flow inductor and the temperature inductor.
2. The automatic microwave stirring, heating and decomposing device for natural gas hydrate as claimed in claim 1, wherein the shell of the microwave stirring and heating chamber is sequentially provided with a wave-transparent heat-insulating layer, a wave-absorbing heat-generating layer and a reverse wave heat-transfer metal layer from outside to inside.
3. The automatic microwave stirring, heating and decomposing device for natural gas hydrate as claimed in claim 2, wherein the wave-transparent heat-insulating layer is made of ceramic fiber cotton.
4. The natural gas hydrate automatic microwave stirring heating decomposition device according to claim 2, wherein the wave-absorbing heating layer fixes microwave-absorbing material powder on the metal surface by a plasma spraying method.
5. The automatic microwave stirring, heating and decomposing device for natural gas hydrates according to claim 2, wherein the reverse wave heat transfer metal layer is made of aluminum, aluminum alloy or stainless steel.
6. The automatic microwave stirring, heating and decomposing device for natural gas hydrates according to claim 1, wherein the stirring device comprises a rotating shaft cylinder, a stirring rod, a speed reducer and a rotating motor;
through holes for inserting the rotating shaft cylinder are formed in the tops of the metal shell and the microwave stirring and heating cavity, the rotating shaft cylinder is longitudinally arranged in the microwave stirring and heating cavity, a plurality of stirring rods are transversely and uniformly arranged on the rotating shaft cylinder, and one end of the rotating shaft cylinder penetrates through the through holes and is fixedly connected with the output end of the rotating motor through the speed reducer;
the rotating motor is also electrically connected with the controller.
7. The automatic microwave stirring, heating and decomposing device for natural gas hydrates according to claim 1, wherein a switch control module, a stirring control module and a microwave control module are arranged in the controller;
the switch control module is used for controlling the first electromagnetic switch to be switched on or switched off according to the flow sensed by the flow sensor in real time and a preset flow threshold value, and controlling the second electromagnetic switch to be switched on or switched off according to the temperature sensed by the temperature sensor in real time and a preset temperature threshold value;
the stirring control module is used for controlling the power of the rotating motor and the on or off of the rotating motor;
the microwave control module is used for controlling the output power of the microwave emitter and the on or off of the microwave emitter.
8. The natural gas hydrate automatic microwave stirring heating decomposition device according to claim 1, wherein the fluidized bed dryer is a vibrating fluidized bed dryer.
9. The use method of the automatic microwave stirring, heating and decomposing device for the natural gas hydrate, which is based on any one of claims 1 to 8, is characterized by comprising the following steps:
1) starting the first centrifugal pump, controlling a first electromagnetic switch to be turned on by a controller and starting a microwave emitter and a stirring device, enabling the natural gas hydrate to enter a microwave stirring and heating cavity through a flow sensor under the action of the first centrifugal pump, and sensing the flow of the natural gas hydrate entering the microwave stirring and heating cavity in real time by the flow sensor;
2) the microwave generated by the microwave emitter is dispersed by the waveguide, passes through the wave-transparent heat-insulating layer of the microwave stirring heating cavity and is absorbed by the wave-absorbing heating layer, the wave-absorbing heating layer after absorbing the microwave rapidly heats and rapidly transfers heat to the reverse wave heat-transfer metal layer, and the outward heat transfer is blocked by the wave-transparent heat-insulating layer;
3) the stirring device is used for stirring the natural gas hydrate in the microwave stirring heating cavity, so that the heat energy on the reverse wave heat transfer metal layer is quickly and uniformly transferred to the natural gas hydrate in the microwave stirring heating cavity;
4) the flow sensor senses the flow of the natural gas hydrate entering the microwave stirring and heating cavity in real time, and the controller controls the first electromagnetic switch to be turned off when the flow of the natural gas hydrate reaches a preset flow threshold value;
5) the temperature sensor senses the temperature of the natural gas hydrate leaving the microwave stirring heating cavity in real time, when the temperature of the natural gas hydrate is higher than a preset temperature threshold value, the controller controls the microwave emitter and the rotating motor to be turned off and the second electromagnetic switch to be turned on, and the natural gas hydrate enters the gas-liquid-solid three-phase separator;
6) the gas-liquid-solid three-phase separator is used for carrying out gas-liquid-solid three-phase separation on the natural gas hydrate, and the separated liquid phase and the separated solid phase enter a fluidized bed dryer for drying to obtain nylon and rock debris, and the nylon and the rock debris respectively enter a nylon collecting cylinder and a rock debris collecting cylinder;
7) the separated gas phase enters a gas storage tank under the action of a second centrifugal pump.
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| CN113266309A (en) * | 2021-04-25 | 2021-08-17 | 深圳市信辉源科技有限公司 | Efficient energy-saving explosion-proof electromagnetic heater for petroleum and natural gas |
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