CN115949930A - Tubular electromagnetic induction steam generating furnace and steam generating method - Google Patents
Tubular electromagnetic induction steam generating furnace and steam generating method Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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Abstract
The invention discloses a tubular electromagnetic induction steam generator, which comprises a tubular furnace body, wherein an electromagnetic coil is arranged in the wall of the tubular furnace body; the core pipe penetrates through the inner cavity of the tubular furnace body; an annular space is formed between the core tube and the tubular furnace body; the spiral pipe is arranged outside the core pipe; the spiral pipe is a hollow pipe, the upper end of the spiral pipe is communicated with the water replenishing interface, and the lower end of the spiral pipe is communicated with the annular space; the gas-liquid separation device is arranged at the upper end of the tubular furnace body; the inlet of the gas-liquid separation device is communicated with the annular space of the tubular furnace body, and the outlet of the gas-liquid separation device is communicated with the inner cavity of the core pipe. The invention takes the core pipe as the heating pipe, the longer the length of the furnace body is, the more sufficient the heat exchange between the steam and the inner cavity of the core pipe is, and the higher the temperature of the steam is, in the process that the liquid water flows downwards along the furnace body, the invention thoroughly solves the problem of heat loss of the high-temperature steam transmitted from the ground to the bottom of the well. The invention also discloses a high-temperature steam generation method.
Description
Technical Field
The invention relates to steam generation equipment, in particular to a tubular electromagnetic induction steam generation furnace. The invention also relates to a high-temperature steam generation method.
Background
The reserves of thick oil on earth are twice of the reserves of common light crude oil. However, the heavy oil is difficult to recover and the recovery cost is high. At present, heavy oil recovery mainly depends on thermal recovery, and the most common effective thermal recovery means is to inject steam into an oil layer. However, the thermal recovery technique has the following problems:
first, the steam required for thermal recovery must be generated at the surface and injected into the heavy oil reservoir along the surface pipeline and well, thus requiring high injection pressures and energy expenditures.
Secondly, from the ground to an oil layer, a shallow well has hundreds of meters, a deep well has thousands of meters, heat loss along the way is extremely large, and when high-temperature steam reaches the bottom of the well, only the temperature of hot water is increased, so that the ideal temperature required by thermal recovery is difficult to achieve. Therefore, in order to improve the steam injection effect, steam can be injected into an oil layer at intervals in a high-strength manner in a 'flood flooding' manner only by reducing the 'line loss' of the frequently preheated shaft caused by high-frequency secondary gas injection, and then oil is extracted for a plurality of days in a centralized manner; the production has great fluctuation, and the drop irrigation type gas injection thermal recovery is difficult to realize according to the requirement.
Thirdly, the contact surface can be enlarged and the development yield can be improved by digging a horizontal well in an oil layer. However, even if the injected steam has high temperature when reaching the bottom of the vertical well, the heat is not easy to go deep into the tail end along the horizontal well, so that the whole horizontal well section is heated and viscidity is reduced.
Fourthly, the thick oil well which is arranged in the north polar circle and has the frozen soil layer near the north polar circle is not allowed to inject steam, otherwise the frozen soil around the upper section of the oil well is melted by high-temperature steam, and methane gas is released, so that the shaft is unstable, and environmental disasters and oil well safety accidents are caused.
Accordingly, it is desirable to employ techniques for generating steam directly downhole. However, the existing technology for generating steam underground is not worth popularizing either because the system is too complex and difficult to implement or because the cup waterwheel pay per unit time is output. For example, chinese utility model patent document CN205782800U discloses an electric heating type downhole steam generator which can generate only 70kg of steam per hour. The heavy oil thermal recovery requires that the amount of steam injected from the ground is between 1 and 10 tons per hour. Obviously, the downhole steam generator disclosed in this patent document generates steam in quantities that are electrically heated downhole, far from the target for heavy oil thermal recovery.
The reason for this is that it is impossible to install an electrothermal converter body having a sufficient volume due to the narrow space of the shaft. A7 inch diameter casing can be used to house a downhole steam generator, which cannot have an inside diameter exceeding 150mm and a length not exceeding 20m. Therefore, the heating element and the gas-liquid separation device which can be built in the shaft are very limited. The lack of space can only be compensated by increasing the temperature of the heating element, but the extremely high temperature of the heating element puts extremely high demands on all sealing members, insulating materials, etc. in the steam generator, such as materials, processing techniques, etc. Therefore, the problem of small steam production cannot be fundamentally solved.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a tubular electromagnetic induction steam generating furnace which can be used underground and directly generate high-temperature steam at a position close to a thick oil layer.
In order to solve the technical problems, the technical scheme of the tubular electromagnetic induction steam generating furnace provided by the invention is as follows:
comprises a tubular furnace body 1, wherein an electromagnetic coil 5 is arranged in the pipe wall of the tubular furnace body 1; the core tube 2 is arranged in the inner cavity of the tubular furnace body 1 in a penetrating way; an annular space I is formed between the core tube 2 and the tubular furnace body 1; the spiral pipe 3 is arranged outside the core pipe 2; the spiral pipe 3 is a hollow pipe, the upper end 3-1 of the spiral pipe 3 is communicated with a water supplementing interface, and the lower end of the spiral pipe 3 is communicated with the annular space I; the gas-liquid separation device 4 is arranged at the upper end of the tubular furnace body 1; the inlet of the gas-liquid separation device 4 is communicated with the annular space I of the tubular furnace body 1, and the outlet of the gas-liquid separation device 4 is communicated with the inner cavity II of the core pipe 2.
In another embodiment, the core tube 2 is arranged concentrically with the tube furnace body 1.
In another embodiment, the inner diameter D3 of the spiral tube 3 matches the outer diameter D2 of the core tube 2; the outer diameter d3 of the spiral pipe 3 is smaller than the inner diameter d1 of the tubular furnace body 1.
In another embodiment, the inner ring of the spiral tube 3 is in contact with the outer wall of the core tube 2; and a gap is formed between the outer ring of the spiral pipe 3 and the inner wall of the tubular furnace body 1.
In another embodiment, the tubular furnace body 1 is a composite material multilayer continuous tube, and comprises a structural layer 11, an electromagnetic shielding layer 12, an inner liner layer 13, a fiber reinforced layer 14 and an outer cladding layer 15 which are sequentially arranged from inside to outside; the electromagnetic coil 5 is arranged in the structural layer 11; a cable 6 is arranged in the inner lining layer 13; an electrical cable 6 is electrically connected to the electromagnetic coil 5.
In another embodiment, the electromagnetic shielding layer 12 is made of a material with electromagnetic shielding property; the fiber reinforced layer 14 is made of a composite material formed by infiltrating fibers with resin; the structural layer 11, the lining layer 13 and the outer coating layer 15 are made of one or more high-temperature-resistant high polymer materials.
In another embodiment, the spiral tube 3 is a capillary tube; the capillary tube is made of high-temperature-resistant and electromagnetic induction-free materials.
In another embodiment, the core tube 2 includes an electromagnetic induction tube body 21, a heat-conducting fin 22 is fixedly disposed on an inner wall of the electromagnetic induction tube body 21, and a heat-reducing coating 23 is applied on an outer wall of the electromagnetic induction tube body 21.
In another embodiment, the outer wall of the heat conducting fin 22 is matched with the inner wall of the electromagnetic induction tube body 21, and a plurality of protrusions are distributed on the inner wall of the heat conducting fin 22 along the circumferential direction; the electromagnetic induction tube body 21 is made of an iron-based material.
In another embodiment, the protrusions of the heat conducting fins 22 extend toward the center of the core tube 2; flow passages are formed between the adjacent bulges.
In another embodiment, the cross-sectional area of the inner hole of the core tube 2 is not less than the cross-sectional area of the annular space I between the core tube 2 and the tube furnace body 1.
The invention also provides a high-temperature steam generation method, which adopts the technical scheme that the method comprises the following steps:
firstly, liquid water is injected into the spiral pipe 3, and the water flows downwards along the spiral pipe 3 and flows into an annular space I from the inner cavity of the spiral pipe 3;
secondly, electrifying the electromagnetic coil 5; the electrified electromagnetic coil 5 and the core tube 2 generate electromagnetic induction, so that the core tube 2 generates heat;
thirdly, the heat reducing coating 23 on the outer surface of the core tube 2 enables a small part of the heat generated by the core tube 2 to be conducted to the annular space I, and the rest most of the heat is conducted to the inner cavity II of the core tube 2; the heat generated in the core tube 2 heats the water to become saturated steam, and further, high temperature steam.
In another embodiment, the method of generating high temperature steam is as follows:
a small part of heat generated by the core tube 2 heats water in the annular space I, so that liquid water in the annular space I is vaporized into saturated steam; the saturated steam flows upwards along the annular space I; when the saturated steam flows to the top of the steam generating furnace, the saturated steam enters the gas-liquid separation device 4; the gas-liquid separation device 4 separates the liquid water in the saturated steam from the water vapor, and the liquid water is continuously vaporized under the action of heat in the annular space I; the water vapor enters the inner cavity II of the core pipe 2 after passing through the gas-liquid separation device 4; along with the continuous generation of subsequent water vapor, the water vapor flows downwards along the inner cavity II of the core pipe 2 under the action of the self pressure; in the process that the water vapor flows downwards along the inner cavity II of the core tube 2, most of heat generated by the core tube 2 heats the water vapor in the inner cavity II of the core tube 2 to become high-temperature superheated steam.
The invention can achieve the technical effects that:
the invention takes the core pipe as the heating pipe, and the longer the length of the furnace body is, the more sufficient the heat exchange between the steam and the inner cavity of the core pipe is, and the higher the temperature of the steam is in the process that liquid water flows downwards along the furnace body. Therefore, the invention thoroughly solves the problem of heat loss of high-temperature steam in the process of conveying from the ground to the bottom of the well.
The amount of steam produced by the present invention is determined by the current power, the diameter and length of the furnace body, and by feeding e.g. 2000 kilovolt-ampere current downhole, high enthalpy steam or saturated steam can be produced at 1-3 tons per hour, which corresponds to an efficiency of 6 tons of steam produced and injected at the surface per hour. The higher the enthalpy value carried by the unit steam is, the lower the water content of the produced thick oil with the same viscosity reduction effect is, and the energy consumption of the thick oil in the lifting process and the energy consumption of oil-water separation after the thick oil is discharged from the ground can be greatly saved.
The invention can control the amount of generated steam by regulating and controlling current power and water supplement amount, thereby realizing 'drip irrigation' type gas injection thermal recovery as required.
Drawings
It is to be understood by those skilled in the art that the following description is only exemplary of the principles of the present invention, which may be applied in numerous ways to achieve many different alternative embodiments. These descriptions are made for the purpose of illustrating the general principles of the present teachings and are not meant to limit the inventive concepts disclosed herein.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the general description given above and the detailed description of the drawings given below, serve to explain the principles of the invention.
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic view of a tubular electromagnetic induction steam generator of the present invention;
FIG. 2 is a schematic cross-sectional view of a tubular electromagnetic induction steam generator of the present invention, showing the coils;
FIG. 3 is a schematic view of a tube furnace body of the present invention;
FIG. 4 is a schematic cross-sectional view of a tube furnace of the present invention; the inner diameter of the tubular furnace body is D1, and the outer diameter of the tubular furnace body is D1;
FIG. 5 is a schematic view of a core tube of the present invention;
FIG. 6 is a schematic cross-sectional view of a core tube of the present invention; the inner diameter of the core tube is D2, and the outer diameter of the core tube is D2;
FIG. 7 is a schematic cross-sectional view of another embodiment of the core tube of the present invention; the inner diameter of the core tube is D2, and the outer diameter of the core tube is D2;
FIG. 8 is a schematic illustration of a spiral pipe of the present invention;
FIG. 9 is a schematic view of a capillary tube of the present invention;
FIG. 10 is a schematic cross-sectional view of a capillary tube of the present invention; the inner diameter of the capillary tube is D4, and the outer diameter of the capillary tube is D4;
fig. 11 is a schematic diagram of the working principle of the present invention.
The reference numbers in the figures illustrate:
3 is a spiral pipe, 4 is a gas-liquid separation device,
11 is a structural layer, 12 is an electromagnetic shielding layer,
13 is an inner lining layer, 14 is a fiber reinforced layer,
15 is an outer coating layer, and the outer coating layer,
21 is an electromagnetic induction tube body, 22 is a heat conduction fin,
23 is a heat-reducing coating layer, and,
i is an annular space, and II is an inner cavity of the core tube.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the terms "first," "second," and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" and similar words are intended to mean that the elements or items listed before the word cover the elements or items listed after the word and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
As shown in fig. 1 and 2, the tubular electromagnetic induction steam generating furnace of the present invention comprises a tubular furnace body 1, wherein a core tube 2 is arranged in the inner cavity of the tubular furnace body 1 in a penetrating manner, and an annular space I is formed between the core tube 2 and the tubular furnace body 1; a spiral pipe 3 is arranged outside the core pipe 2;
an annular space I between the tubular furnace body 1 and the core pipe 2 is used as a gas-liquid phase change area;
the inner cavity II of the core tube 2 is used as a superheated steam area;
the upper end of the tubular furnace body 1 is connected with a gas-liquid separation device 4; the annular space I of the tubular furnace body 1 is communicated with the inlet of the gas-liquid separation device 4, and the outlet of the gas-liquid separation device 4 is communicated with the inner cavity II of the core pipe 2; the gas-liquid separation device 4 separates liquid water in the wet steam from the water steam, thereby intercepting liquid in the steam; the liquid water returns to the annular space I, and the water vapor enters the inner cavity II of the core pipe 2 after passing through the gas-liquid separation device 4.
The gas-liquid separation device 4 of the present invention may adopt any existing technology capable of realizing gas-liquid separation, and will not be described herein.
As a preferred embodiment, the core tube 2 is arranged concentrically with the tube furnace body 1, i.e. the core tube 2 and the tube furnace body 1 form a concentric circular structure, so that the width H is substantially equal everywhere in the annular space I.
In order to generate steam uniformly in the steam generating furnace, it is necessary to ensure that the width H of the annular space I formed between the core tube 2 and the tubular furnace body 1 is substantially equal. However, since the core tube 2 and the tubular furnace body 1 are both slender tubes, it is difficult to keep the circumferential distance H between the two in the annular space I extending in the axial direction consistent, that is, at different heights of the furnace body, the circumferential distance H1 at any one position is not equal to the circumferential distance H2 at another position.
In order to solve the technical problem, a spiral tube 3 is arranged between a core tube 2 and a tubular furnace body 1, the inner diameter D3 of the spiral tube 3 is matched with the outer diameter D2 of the core tube 2, and the outer diameter D3 of the spiral tube 3 is smaller than the inner diameter D1 of the tubular furnace body 1, as shown in figure 8; so that the inner ring of the spiral tube 3 is in contact with the outer wall of the core tube 2, and a gap is formed between the outer ring of the spiral tube 3 and the inner wall of the tubular furnace body 1, thereby preventing direct heat transfer between the core tube 2 and the tubular furnace body 1 through the spiral tube 3.
As a preferred embodiment, the diameter d3 of the outer ring of the spiral pipe 3 is 1 to 2mm smaller than the inner diameter d1 of the tube furnace body 1, so that a gap is formed between the outer ring of the spiral pipe 3 and the inner wall of the tube furnace body 1 to facilitate the relative positioning between the core pipe 2 and the tube furnace body 1.
The spiral pipe 3 of the invention can centralize the core pipe 2 arranged in the pipe furnace body 1, thereby basically keeping equal distance between the core pipe 2 and the inner wall of the pipe furnace body 1, and keeping the circumferential distance H of the annular space I consistent.
As a preferred embodiment, the spiral tube 3 is a continuous capillary tube wound around the outer wall of the core tube 2, as shown in fig. 9 and 10. The inner hole of the spiral pipe 3 can be used as a water replenishing channel of the steam generating furnace. The spiral pipe 3 extends from the upper part to the lower part of the annular space I, the upper end 3-1 of the spiral pipe 3 is communicated with the water supplementing interface, and the lower end of the spiral pipe 3 is communicated with the annular space I.
As a preferred embodiment, the capillary tube is made of a material which is resistant to high temperature and does not have electromagnetic induction.
As shown in fig. 3 and 4, the tubular furnace body 1 is a multilayer continuous tube made of composite materials, and the tube body includes a structural layer 11, an electromagnetic shielding layer 12, an inner liner layer 13, a fiber reinforcement layer 14 and an outer cladding layer 15 which are sequentially arranged from inside to outside;
the electromagnetic coil 5 is arranged in the structural layer 11; the electromagnetic coil 5 surrounds the core tube 2 therein so as to be capable of forming electromagnetic induction;
a cable 6 is arranged in the inner liner layer 13; the cable 6 is electrically connected with the electromagnetic coil 5, so that the electromagnetic coil 5 can be powered; the cable 6 can adopt a cable capable of transmitting high-voltage current;
the electromagnetic shielding layer 12 is made of a material having electromagnetic shielding properties, such as aluminum foil.
The fiber reinforced layer 14 is made of fiber materials, such as glass fiber, basalt fiber, carbon fiber, aramid fiber, and the like.
The structural layer 11, the inner liner layer 13 and the outer cladding layer 15 are made of high temperature resistant polymer materials capable of working for a long time in a high temperature environment of more than 150 ℃, such as PDFE (tetrafluoroethylene), PPS (polyphenylene sulfide), PEEK (polyether ether ketone) and the like.
As a preferred embodiment, the length of the tube furnace 1 is 10 to 300m.
The tubular furnace body 1 is formed by compounding high polymer materials and fibers, can be used as a pressure-bearing container, and can work for a long time under the pressure of not more than 25 MPa.
The invention arranges the electromagnetic coil 5 in the tube wall of the tube furnace body 1; according to different heating temperature requirements, sparse and different coil turns can be arranged at different positions of the furnace body so as to achieve different heating requirements for different sections.
As shown in fig. 5 and 6, the core tube 2 includes an electromagnetic induction tube body 21, the inner wall of the electromagnetic induction tube body 21 is fixedly provided with a heat conduction fin 22, and the outer wall of the electromagnetic induction tube body 21 is coated with a heat reduction coating 23;
as a preferred embodiment, the outer wall of the heat conducting fin 22 is matched with the inner wall of the electromagnetic induction tube body 21, and a plurality of protrusions are distributed on the inner wall of the heat conducting fin 22 along the circumferential direction to increase the surface area of the inner wall of the heat conducting fin 22, as shown in fig. 6.
As another preferred embodiment, the protrusions form a petal shape; the projections extend toward the center of the core tube 2 and meet at the center of the core tube 2 so that heat can be conducted toward the center of the core tube 2 through the fins, as shown in fig. 7. Flow channels are formed between adjacent projections so that the core tube 2 has a plurality of flow channels.
The electromagnetic induction tube body 21 of the invention adopts iron-based materials, can be used as an electromagnetic inductor and generates electromagnetic induction with the electromagnetic coil 5 in the tube type furnace body 1, thereby leading the electromagnetic induction tube body 21 to generate heat and leading the core tube 2 to become a heating tube.
As a preferred embodiment, the electromagnetic induction pipe body 21 may be an iron-based metal continuous pipe or a continuous metal pipe formed by connecting a plurality of iron-based metal pipes.
The outer surface of the core tube 2 is provided with the heat reducing coating 23, the heat reducing coating 23 is used for nonequivalent heat dissipation of the core tube 2, and can reduce the heat conductivity of the outer surface of the core tube 2, so that the temperature of the inner cavity of the core tube 2 is higher than the temperature of the outer part of the core tube 2, and the temperature of the annular space I is lower than the temperature of the inner cavity II of the core tube 2. In addition, the saturated steam in the annular space I can form a dynamic heat insulation belt to separate the high-temperature steam in the inner cavity II of the core tube 2 from the tubular furnace body 1 made of the composite material, so that the furnace body 1 is protected from the threat of hundreds of high temperatures of the heating body.
The heat conduction fins 22 are embedded in the inner surface of the core tube 2, and the heat conduction fins 22 can improve the heat conduction performance, so that steam flowing through the inner cavity II of the core tube 2 obtains more heat, and the temperature of high-temperature steam reaching the bottom of the furnace is effectively improved.
As a preferred embodiment, the sectional area of the inner hole of the core tube 2 is not smaller than the sectional area of the annular space I between the core tube 2 and the tube furnace body 1.
The tubular furnace body 1 of the invention can be unfolded to work in a linear state such as vertical, oblique line or arc line; and also in a coiled state.
When the tubular furnace body 1 is unfolded for use in a linear state, the tubular furnace body is particularly suitable for being used underground, so that the problem of narrow underground space is solved.
Of course, the invention can also be used on the ground, occupies smaller space, and is safer and more efficient than the traditional steam boiler.
When the tube furnace body 1 is used on the ground, no matter the tube furnace body 1 is used in an unfolding mode or in a coiling state, the tube furnace body 1 can be arranged in a container (in a pool or a tube body) filled with water, so that the furnace body 1 is immersed in the water; the external radiation heat dissipation of the furnace body 1 can be absorbed by water, which is helpful for the heat dissipation of the furnace body 1 on one hand, thereby prolonging the service life of the furnace body 1; on the other hand, the water in the container can be used as a water replenishing source of the steam boiler, and the absorption of the radiant heat of the boiler body is just the preheating of the water replenishing, so that the utilization efficiency of heat energy is improved.
When the present invention is used on the ground, the water replenishing function of the spiral pipe 3 can be cancelled, and the righting function of the spiral pipe 3 can be replaced by a simpler member.
The invention discloses a steam generation method of a tubular electromagnetic induction steam generator, which comprises the following steps:
step one, normal temperature water is injected into the upper end 3-1 of the spiral pipe 3, and the water flows downwards along the spiral pipe 3 and flows into the annular space I from the lower end of the spiral pipe 3;
secondly, electrifying the electromagnetic coil 5 through the cable 6; the electrified electromagnetic coil 5 and the core tube 2 generate electromagnetic induction, so that the core tube 2 generates heat;
thirdly, the heat reducing coating 23 on the outer surface of the core tube 2 enables a small part of the heat generated by the core tube 2 to be conducted to the annular space I, and the rest most of the heat is conducted to the inner cavity II of the core tube 2; the heat generated by the core tube 2 heats the water into saturated steam, and then the saturated steam becomes high-temperature steam;
the method for heating water into high-temperature steam by the core pipe comprises the following steps:
as shown in fig. 11, a small portion of heat generated by the core tube 2 heats the water in the annular space I, so that the liquid water in the annular space I is vaporized into saturated steam (generally 120-150 ℃, specifically related to the pressure of the inner cavity of the furnace body); the saturated steam flows to the gas-liquid separation device along the annular space I; when the saturated steam flows to the gas-liquid separation device, the saturated steam enters the gas-liquid separation device 4; the gas-liquid separation device 4 separates the liquid water in the saturated steam from the water vapor, and the liquid water is continuously vaporized under the action of heat in the annular space I; the water vapor enters the inner cavity II of the core pipe 2 after passing through the gas-liquid separation device 4; along with the continuous generation of subsequent water vapor, the water vapor flows downwards along the inner cavity II of the core pipe 2 under the action of the self pressure; in the process that the water vapor flows downwards along a plurality of flow channels of the inner cavity II of the core tube 2, the heat-conducting fins 22 of the inner cavity II of the core tube 2 are fully contacted with the water vapor, most of heat generated by the core tube 2 heats the water vapor in the inner cavity II of the core tube 2, and when the water vapor reaches the bottom of the furnace, the water vapor becomes high-temperature superheated steam (the temperature can reach more than 300 ℃); the high temperature steam has a higher enthalpy than the steam injected down the well head.
The invention utilizes the electromagnetic induction between the core tube 2 and the electromagnetic coil 5 arranged in the wall of the furnace body to make the core tube 2 become a heating body; in addition, the heat reducing coating 23 is arranged on the outer surface of the core pipe 2, so that the heat conducted to the inner cavity II of the core pipe 2 is larger than the heat conducted to the annular space I, and the fluid in the inner cavity II of the core pipe 2 and the fluid in the annular space I outside the core pipe 2 are subjected to nonequivalent heat energy exchange. The liquid water in the furnace bottom annular cavity is vaporized into steam under the action of the heat of the annular space I and flows from bottom to top; after the steam enters the inner cavity II of the core tube 2, the temperature continues to rise under the action of the heat of the inner cavity II of the core tube 2 and the steam flows from top to bottom to become high-temperature superheated steam.
The tubular furnace body 1 is a multilayer continuous tube body made of composite materials, and the furnace body has flexibility, so that coiling can be realized, and transportation is facilitated.
The tubular furnace body 1 adopts the composite material continuous tube, and can solve the dilemma of narrow underground space by prolonging the length of the furnace body, thereby ensuring that the fluid has enough heating time.
The invention can be used for heavy oil thermal recovery. Moreover, the invention has the potential of expanding application in the mining field of combustible ice and oil shale.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (10)
1. A tubular electromagnetic induction steam generating furnace, comprising:
the tube furnace comprises a tube furnace body (1), wherein an electromagnetic coil (5) is arranged in the tube wall of the tube furnace body (1);
the core pipe (2) is arranged in the inner cavity of the tubular furnace body (1) in a penetrating way; an annular space (I) is formed between the core tube (2) and the tubular furnace body (1);
a spiral tube (3) disposed outside the core tube (2); the spiral pipe (3) is a hollow pipe, the upper end (3-1) of the spiral pipe (3) is communicated with the water supplementing interface, and the lower end of the spiral pipe (3) is communicated with the annular space (I); and
the gas-liquid separation device (4) is arranged at the upper end of the tubular furnace body (1); the inlet of the gas-liquid separation device (4) is communicated with the annular space (I) of the tubular furnace body (1), and the outlet of the gas-liquid separation device (4) is communicated with the inner cavity (II) of the core pipe (2).
2. The tubular induction steam generator of claim 1, wherein the cross-sectional area of the inner bore of the core tube (2) is not smaller than the cross-sectional area of the annular space (I).
3. The tubular induction steam generator of claim 1, characterized in that the inner diameter (D3) of the spiral tube (3) is matched to the outer diameter (D2) of the core tube (2); the outer diameter (d 3) of the spiral pipe (3) is smaller than the inner diameter (d 1) of the tubular furnace body (1); the inner ring of the spiral pipe (3) is in contact with the outer wall of the core pipe (2); a gap is formed between the outer ring of the spiral pipe (3) and the inner wall of the tubular furnace body (1).
4. The tubular electromagnetic induction steam generating furnace of claim 1, characterized in that the tubular furnace body (1) is a composite material multilayer continuous tube, comprising a structural layer (11), an electromagnetic shielding layer (12), an inner lining layer (13), a fiber reinforcement layer (14) and an outer coating layer (15) which are arranged in sequence from inside to outside; the electromagnetic coil (5) is arranged in the structural layer (11); a cable (6) is arranged in the inner lining layer (13); the cable (6) is electrically connected with the electromagnetic coil (5).
5. The tubular induction steam generator of claim 4, wherein the electromagnetic shielding layer (12) is made of a material having electromagnetic shielding properties;
and/or the fiber reinforced layer (14) adopts resin to soak the composite material formed by the fibers;
and/or the structural layer (11), the lining layer (13) and the outer coating layer (15) are made of one or more high-temperature-resistant high polymer materials.
6. The tubular electromagnetic induction steam generator of claim 1, characterized in that the core tube (2) comprises an electromagnetic induction tube body (21), the inner wall of the electromagnetic induction tube body (21) is provided with heat conducting fins (22), and the outer wall of the electromagnetic induction tube body (21) is coated with a heat reducing coating (23).
7. The tubular electromagnetic induction steam generator of claim 6, wherein the outer wall of the heat conducting fin (22) is fitted with the inner wall of the electromagnetic induction tube body (21), and a plurality of protrusions are distributed on the inner wall of the heat conducting fin (22) along the circumferential direction; the electromagnetic induction tube body (21) is made of an iron-based material.
8. The tubular induction steam generator of claim 7, wherein the projections of the heat conductive fins (22) extend toward the center of the core tube (2); flow passages are formed between the adjacent bulges.
9. A high temperature steam generation method, comprising the steps of:
firstly, liquid water is injected into the spiral pipe (3), and the water flows downwards along the spiral pipe (3) and flows into an annular space (I) from the inner cavity of the spiral pipe (3);
secondly, electrifying the electromagnetic coil (5); the electrified electromagnetic coil (5) and the core tube (2) generate electromagnetic induction, so that the core tube (2) generates heat;
thirdly, the heat reducing coating (23) on the outer surface of the core tube (2) enables a small part of the heat generated by the core tube (2) to be conducted to the annular space (I) and the rest most of the heat to be conducted to the inner cavity (II) of the core tube (2); the heat generated by the core tube (2) heats the water into saturated steam and further into high-temperature steam.
10. A high-temperature steam generation method according to claim 9, wherein the high-temperature steam is generated by:
a small part of heat generated by the core pipe (2) heats water in the annular space (I) to vaporize the liquid water in the annular space (I) into saturated steam; the saturated steam flows to the gas-liquid separation device (4) along the annular space (I), the gas-liquid separation device (4) separates liquid water in the saturated steam from water vapor, and the liquid water is continuously vaporized under the action of heat in the annular space (I); the water vapor enters the inner cavity (II) of the core pipe (2) after passing through the gas-liquid separation device (4) and flows downwards along the flow channel of the inner cavity (II) of the core pipe, and most of heat generated by the core pipe (2) heats the water vapor in the inner cavity (II) of the core pipe to become high-temperature superheated steam.
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| GB1221521A (en) * | 1967-04-29 | 1971-02-03 | Mitchell Engineering Ltd | Improvements in or relating to water tube boilers |
| CA2633061A1 (en) * | 2000-02-23 | 2001-08-23 | Nsolv Corporation | Method and apparatus for stimulating heavy oil production |
| CN2660396Y (en) * | 2003-01-24 | 2004-12-01 | 田科 | Magnetic heating, low pressureindustrial heating boiler |
| CN101067372A (en) * | 2007-06-07 | 2007-11-07 | 苏州新阳光机械制造有限公司 | High-pressure mixed gas generator used for petroleum thermal recovery gas injection machine |
| CN210424982U (en) * | 2019-08-26 | 2020-04-28 | 广州博恩能源有限公司 | Coil pipe type steam generator furnace body |
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2023
- 2023-02-17 CN CN202310134690.9A patent/CN115949930B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1221521A (en) * | 1967-04-29 | 1971-02-03 | Mitchell Engineering Ltd | Improvements in or relating to water tube boilers |
| CA2633061A1 (en) * | 2000-02-23 | 2001-08-23 | Nsolv Corporation | Method and apparatus for stimulating heavy oil production |
| CN2660396Y (en) * | 2003-01-24 | 2004-12-01 | 田科 | Magnetic heating, low pressureindustrial heating boiler |
| CN101067372A (en) * | 2007-06-07 | 2007-11-07 | 苏州新阳光机械制造有限公司 | High-pressure mixed gas generator used for petroleum thermal recovery gas injection machine |
| CN210424982U (en) * | 2019-08-26 | 2020-04-28 | 广州博恩能源有限公司 | Coil pipe type steam generator furnace body |
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| CN115949930B (en) | 2024-03-05 |
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