Composite thermal carrier combustor with jacket structure

Abstract

The present invention relates to a composite thermal carrier combustor with a jacket structure, wherein, in order to reduce greenhouse gas emissions and improve energy efficiency by reducing the usage of steam or water required in a process of extracting oil components from unconventional oil, water is vaporized by direct spray onto the flame (combustion gas) inside a combustor operated at high pressure, so that a composite thermal carrier (combustion gas mixture) is generated together with steam, and the composite thermal carrier thus generated can be used by injection into an oil sand reservoir through a transfer pipe.

Description

Composite heat carrier combustor with jacket structure

[0001] The present invention relates to a composite heat carrier combustor having a jacket structure, and more specifically, to a composite heat carrier combustor having a jacket structure in which water is directly injected into a flame (combustion gas) inside a combustor operated at high pressure to vaporize it, thereby generating a composite heat carrier (combustion gas mixture) together with steam, and the composite heat carrier thus generated is injected into an oil sand reservoir through a conveying pipe together with steam, in order to reduce greenhouse gas emissions and improve energy efficiency by reducing the amount of water required in a process of extracting oil components from unconventional oil.

[0002] Oil sands, referred to as unconventional oil resources, emerged as a fossil fuel to replace petroleum after the first oil shock in 1973, and quickly emerged as an alternative resource to crude oil. Since 2000, with continued high oil prices and the introduction of large-scale separation process technology, oil sands development has become active.

[0003] In Korea, the Korea National Oil Corporation has been promoting participation in oil sands development projects since around 1999 to secure overseas independent crude oil development, and interest in oil sands is growing both domestically and internationally.

[0004] The petroleum component extracted from oil sands is bitumen, a heavy, sticky, black substance that accounts for approximately 10 to 12 percent of the oil sands. While conventional crude oil is lighter than water, bitumen has a similar specific gravity to water.

[0005] Since the above bitumen does not flow in a borehole or pipeline in its natural state, it is obtained by adding steam or mixing it with a diluent (ultra-light crude oil or light petroleum products) to lower its specific gravity and viscosity, and then transporting it through a pipeline.

[0006] Because bitumen contains a large amount of water, oil is recovered using primary separation FWKO (Free Water Knock-Out), secondary separation using demulsifier chemicals, and electrostatic fields.

[0007] The produced water generated after oil component recovery still contains a large amount of oil and solid components, so in order to discharge or recycle it, it must go through a produced water treatment process to treat it as water containing less than 15 ppm of oil before it can be discharged into the sea.

[0008] The production cost of extracting bitumen from oil sands was $20 to $25 per barrel, which was higher than the cost of producing conventional crude oil, making it uneconomical. However, with the continued rise in oil prices, research and development and demand for bitumen as an alternative fuel are increasing.

[0009] Commonly known bitumen extraction methods can be divided into a method of extracting bitumen after mining oil sands (post-mining extraction method) and a method of extracting bitumen directly on site (in-situ).

[0010] Looking at specific extraction methods, the hot water extraction process, which was first studied and attempted in the 19th century, is a method of extracting bitumen after mining oil sands, which can recover about 90% of bitumen by injecting and mixing heated water.

[0011] The CSS (cyclic steam stimulation) method, which injects high-pressure, high-temperature (approximately 350℃) steam into the oil sands deposits to break up the oil sands into pieces due to the steam pressure, melt the bitumen due to the high heat of the steam, and then pump the heated bitumen to the surface, and the SAGD (steam-assisted gravity drainage) method, which drills two parallel, horizontal wells and then injects steam into the upper well to generate heat to lower the viscosity of the crude oil, and when the lowered viscosity crude oil accumulates in the lower well, it is pumped to the surface, are being applied to the in-situ extraction method.

[0012] Additionally, there is a method called open-pit mining, which includes the steps of extracting oil sands from the surface of the earth, putting the extracted oil sands into a crusher to crush sand and stones, adding hot water to the oil sands, putting the oil sand mixture into a decomposition vessel to separate sand and bitumen, and removing foam and extracting bitumen through a centrifuge.

[0013] In addition, there is also known VAPEX (vapor extraction process) technology, which is similar to SAGD technology, but uses gravity to extract bitumen by forming a vapor chamber underground by injecting a vaporized solvent such as ethane or propane instead of water.

[0014] Korean Patent Publication No. 10-2187696 relates to an injection connection structure for mining bitumen contained in oil sand, comprising: an injection well including a first vertical pipe buried in the ground in the form of a pipe extending upward and downward; and first horizontal flexible pipes extending in a first direction (1) parallel to the ground surface from the lower portion of the first vertical pipe and connected to each other to be inserted into the oil sand; And a production well including a second vertical pipe buried in the ground at a position adjacent to the first vertical pipe in the form of a pipe extending upwardly and downwardly, and second horizontal flexible pipes extending in the first direction from the lower portion of the second vertical pipe and connected to each other; wherein each of the first and second horizontal flexible pipes includes a reinforcing member extending in a spiral shape from the outer surface of each of the first and second horizontal flexible pipes along the extension direction of each of the first and second horizontal flexible pipes, and wherein each of the first and second horizontal flexible pipes includes a core inserted into the interior of the reinforcing member so as to surround the outer surface of each of the first and second horizontal flexible pipes in a spiral shape, wherein one end is formed in an arch shape surrounding one side of the first or second horizontal flexible pipe, and the other end is rotatably connected to one end and formed in an arch shape surrounding the other side of the first or second horizontal flexible pipe. A center fixing jig characterized by further including a coupler formed and coupled to one end; a clamp surrounding the first or second horizontal flexible pipe and detachably coupled to the first or second horizontal flexible pipes, and rollers formed at the upper and lower portions of the clamp;An injection connection structure for injecting steam has been disclosed, characterized in that it further includes a roller including a bracket and a wheel, the bracket being rotatably connected to a suspension, the suspension including a connecting rod, a bracket, and a spring, the connecting rod being connected to the clamp, the bracket being hinged to the clamp in a first direction, and the spring being installed in the clamp in a second direction, so that the wheel is bent and elastically moved in the second direction during the process in which the first and second horizontal flexible pipes move in the first direction. However, a technology for producing steam together with a composite heat carrier, which is a combustion gas mixture, by directly injecting water into a diffusion flame reflected by a double jacket has not been disclosed.;

[0015] U.S. Patent Publication No. 2018-0087354 discloses a process for in-situ heat recovery of hydrocarbons from a storage tank, comprising the steps of: providing an oxygen mixture, fuel, feedwater, and an additive comprising at least one of ammonia, urea, or a volatile amine to a direct contact steam generator (DCSG); operating the DCSG, wherein the DCSG comprises contacting the feedwater and the additive with hot combustion gases to obtain a steam-based mixture comprising steam, CO2, and the additive; and injecting the steam-based mixture or a stream derived from the steam-based mixture into the storage tank to move the hydrocarbon therein. Producing a manufactured fluid comprising the hydrocarbon is disclosed. However, there is no disclosure regarding a technique for producing steam together with a composite heat carrier, which is a combustion gas mixture, by directly injecting water into a double-jacketed diffusion flame.

[0016] In US Patent Publication No. 2020-0270157, at least one Produced Water Treatment for Reuse (PWTR) is positioned to be supplied downstream from the inlet section. Similar to the oxidizer supply and the fuel supply, the product supply may utilize additional produced wastewater feeds, depending on the designed stoichiometry of the DCSG having a physical structure including at least one source comprising piping or conduit and wastewater produced from a well or formation, but two produced reuse feeds are shown and a portion of the injected reuse water serves to cool the combustion chamber. As an example, the reuse water is cooled by a water film (F) or a combination of a water film and a cooled cooling circuit along the inner surface of the combustion chamber. A system for desalinating and removing contaminants from reuse water generated during oil and gas development, comprising: a unit (10) for directly supplying said wastewater; a DCSG positioned downstream of said supply; a filter positioned downstream of said DCSG for removing solid waste from said reuse water; A system including a condenser for separating combustion exhaust from purified reused water located after the filter is disclosed. However, a technology for producing steam together with a composite heat carrier, which is a combustion gas mixture, by directly injecting water into a double-jacketed diffusion flame has not been disclosed.

[0017] U.S. Patent Publication No. 9512999 discloses a steam generation method comprising an oxygenated direct contact steam generation process, wherein (a) provides (i) and (ii), wherein (i) comprises: a vertically arranged combustor having a first combustor end and a second combustor end, the combustor comprising (1) through (7) a combustor wall comprising a refractory liner and an outer wall having an inner surface defining a combustion space; a burner adjacent the first combustor end; (3) at least a first fuel inlet proximate the first combustor end and configured and arranged to deliver a first fuel to the burner at a delivery pressure exceeding atmospheric pressure; (4) at least one oxidizer inlet proximate the first combustor end and configured and arranged to deliver an oxygen supply having a purity of at least 90% to the burner at a delivery pressure exceeding atmospheric pressure; (5) a plurality of fluid inlets operatively connected to the combustion space and configured and arranged to deliver a supply of fluid comprising dissolved, suspended, and entrained solids and water contaminated with hydrocarbons at a delivery pressure exceeding atmospheric pressure; (6) an outlet zone slag temperature having a flue gas outlet located above and separate from a combustor residue outlet located at or near the bottom end of the second combustor end and capable of managing slag formed in the second combustor end from the solids above; and (7) at least one ash purge cleaning fluid inlet configured and arranged to deliver a cleaning fluid into the second combustor end to contact different surfaces within the combustor, including an interior surface proximate the second combustor end; and (ii) a steam generator operatively connected to the combustor and having an upper zone, a lower zone, a middle zone, and a residue outlet; (b) performing a preheating process at atmospheric pressure to raise the temperature within the combustor wall to a selected temperature; (c) delivering a supply of fuel and oxygen having a purity of at least 90% to the burner at a pressure exceeding the selected combustor operating pressure;(d) combusting fuel in the presence of oxygen at a selected combustor operating pressure and substantially simultaneously delivering a supply of a fluid comprising water at a pressure exceeding the selected combustor operating pressure to the combustion space to produce a flue gas stream and a separate combustion residue; (e) selectively, periodically or substantially continuously, withdrawing and removing combustion residue through a combustor residue outlet; (f) passing the flue gas stream to a lower region of a steam generator and substantially simultaneously delivering a supply of a steam generating fluid comprising water at a pressure exceeding the selected combustor operating pressure to the upper region; (g) contacting the flue gas with the steam generating fluid to produce a stream of generated steam and solid residue; (h) removing the stream of generated steam from the steam generator; and selectively, periodically or substantially continuously, withdrawing and removing through the residue outlet a solid residue comprising slag formed in the second combustor end by delivering a cleaning fluid to the second combustor end and an internal surface proximate the second combustor end by means of at least one ash purge cleaning fluid inlet; A steam generation method including an oxygenated direct contact steam generation process is disclosed. However, there is no disclosure regarding a technology for producing steam together with a composite heat carrier, which is a combustion gas mixture, by directly injecting water into a double jacketed diffusion flame.

[0018] In a single closed loop system, fuel / oxidizer / water is directly combusted at high pressure, and the resulting steam and combustion gas mixture (heat carrier) are injected into the reservoir together. By directly injecting feedwater into the combustion environment, the steam and combustion gas mixture (composite heat carrier) are simultaneously injected into the oil sand reservoir, thereby increasing the recovery rate by further increasing the fluidity within the reservoir through heat carrier components such as CO2 along with the steam.

[0019] It is necessary to develop a composite heat carrier combustor or DCSG, which generates steam by directly injecting water into a flame to generate steam and directly injects the generated steam and combustion gas into a reservoir to extract bitumen from oil sands, and a composite heat carrier combustor with a double jacket configuration that directly injects water into a diffusion flame to generate steam and directly injects the generated steam and a combustion gas mixture, which is a composite heat carrier, into unconventional oil to produce oil components.

[0020] (Prior art literature)

[0021] (Patent Document)

[0022] Korean Patent Publication No. 10-2187696

[0023] U.S. Patent Publication No. 2018-0087354

[0024] U.S. Patent Publication No. 2020-0270157

[0025] U.S. Patent Publication No. 9512999

[0026] The present invention is intended to solve the above problems, and to provide a composite heat carrier combustor having a jacket structure for producing oil components by directly injecting water into a diffusion flame to generate steam and directly injecting the generated steam and combustion gas, which is a composite heat carrier, into non-conventional oil in order to reduce the amount of water used in the process of extracting oil components from non-conventional oil, thereby reducing greenhouse gas emissions and improving energy efficiency.

[0027] In order to reduce greenhouse gas emissions and improve energy efficiency by reducing the amount of water required in the process of extracting oil components from non-traditional oil, a composite heat carrier combustor with a jacket structure in the form of a diffusion flame can be provided that produces steam together with a composite heat carrier, which is a combustion gas mixture, by doubly injecting water directly into a diffusion flame.

[0028] The present invention can also provide a composite heat carrier combustor with a jacket structure that generates steam by directly injecting water into a flame from two or more locations inside a combustion chamber, and directly injects the generated steam and combustion gas into a reservoir to extract bitumen from oil sand.

[0029] In addition, since water is generated during the combustion process of natural gas fuel and the combustion gas is supplied to the reservoir together with steam, thereby increasing fluidity, a composite heat carrier combustor with a jacket structure can be provided that can reduce the amount of water required to produce steam to be supplied to the reservoir compared to the existing SAGD method.

[0030] To achieve this purpose, the present invention provides a composite heat carrier combustor having a jacket structure, including a burner (100); an outer jacket (200) in the form of a vertical tube formed by inserting the burner at the top; an inner jacket (300) having the same central axis formed inside the outer jacket; and an exhaust pipe (400) formed perpendicular to the central axis of the inner jacket, wherein water is directly injected inside the outer jacket and steam and exhaust gas are discharged through the lower portion of the exhaust pipe.

[0031] In addition, the burner is a diffusion flame burner, and includes a burner upper portion (110) having a fuel supply port (111) through which fuel is supplied; an oxidizer supply port (112) through which an oxidizer is supplied; and a first water supply port (113) through which water is supplied; a burner lower portion (120) having one end connected to the burner upper portion and inserted into the interior of the outer jacket; one or more fuel nozzles (121) formed on the central axis of the other end of the burner lower portion; one or more oxidizer nozzles (122) formed in a ring shape around the fuel nozzle; and one or more first water nozzles (123) formed in a ring shape around the oxidizer nozzle.

[0032] In addition, it includes a fuel supply pipe (130) for supplying fuel to the fuel supply port; an oxidizer supply pipe (140) for supplying the oxidizer to the oxidizer supply port; and a first water supply pipe (150) for supplying the water to the first water supply port; and the first water supply pipe may be branched from a second water supply pipe (220) for supplying the water to one or more second water supply ports (210) formed at the lower portion of the outer jacket.

[0033] In addition, a burner insertion part (230) having a hole formed in the upper part of the outer jacket into which the lower part of the burner is inserted; one or more circulation outlets (231) protruding in a horizontal (x-axis) direction from the outer surface of the burner insertion part; a flow path formed in the outer jacket so that the water flowing into the second water supply port can move upward; the water rising to the burner insertion part (230) can be discharged through the circulation outlet and circulated to the inner jacket through a vertical discharge pipe (232) formed in a vertical (y-axis) direction.

[0034] In addition, the vertical discharge pipe may be extended in the vertical (y-axis) direction below the lower end of the outer jacket, and then bent to be introduced into one or more circulation inlets (310) formed in the inner jacket.

[0035] In addition, the outer jacket has a tube shape with a bottom surface (240) that is blocked on the opposite side in the vertical (y-axis) direction where the burner insertion port is formed; one end of the burner insertion port protrudes upward to correspond to the length of the lower burner to be inserted in the y-axis direction, and the end of the burner insertion port is aligned with the upper inner surface of the outer jacket, and may have a rounded shape up to a predetermined position on the vertical surface of the outer jacket based on the end of the burner insertion portion.

[0036] The above inner jacket is formed in a tubular structure with one end blocked, with the open portion facing downward in the vertical (y-axis) direction, and a first predetermined interval (I) is formed in the vertical (y-axis) direction from the bottom surface. F1) is formed, and the circulation inlet formed by contacting the bottom surface may be the circulation inlet.

[0037] In addition, the upper surface (320) in the vertical (y-axis) direction of the inner jacket may be formed in a round shape and one or more second water nozzles (321) may be formed around the central axis in the vertical (y-axis) direction of the upper surface.

[0038] In addition, a flame protection plate (330) protruding upwardly on the vertical (y-axis) direction central axis of the upper surface may be formed.

[0039] In addition, a second predetermined gap (I) is provided between the inner surface of the outer jacket and the outer surface of the inner jacket. F2 ) is formed, and the steam and exhaust gas generated after the combustion reaction can move downward in the vertical (y-axis) direction through the second predetermined interval and flow into the exhaust pipe in the shape of a tube formed along the same axis as the central axis of the inner jacket through the first predetermined interval.

[0040] In addition, the temperature of the upper region inside the outer jacket where the flame is formed may be 1000°C to 1200°C, the temperature of the middle region around the flame protection plate inside the outer jacket may be 500°C to 700°C, and the temperature of the lower region inside the outer jacket below the second predetermined interval in the vertical (y-axis) direction may be 300°C to 500°C.

[0041] To achieve this purpose, the composite heat carrier combustor of the present invention having a jacket structure includes a burner (100); an outer jacket (200) in the form of a vertical tube formed by inserting the burner at the top; an inner jacket (300) having the same central axis formed inside the outer jacket; and an exhaust pipe (400) formed perpendicular to the central axis of the inner jacket; and the burner may be a composite heat carrier combustor having a jacket structure in which a flame is formed inside the outer jacket and water is directly injected into the flame to discharge steam and exhaust gas through the lower portion of the exhaust pipe.

[0042] In order to achieve the above object, the present invention provides a method for operating a composite heat carrier combustor with a jacket structure, comprising: a first step in which a combustion process is performed by supplying fuel while supplying an oxidizer and operating an igniter to form a flame at the bottom of a burner; a second step in which a pump is started to supply water to a water supply port of the burner and a second water supply port of an outer jacket; a third step in which the water supplied to the water supply port is sprayed in the direction of the flame through the first water nozzle, and the water supplied to the second water supply port is circulated on the outer surface of the outer jacket and then supplied to the circulation inlet of the inner jacket; a fourth step in which the water supplied to the circulation inlet is sprayed into a combustion chamber (250) through a second water nozzle formed on the upper surface of the inner jacket; a fifth step in which steam and exhaust gas generated through the combustion process move inwardly of the inner jacket through a portion in which a second predetermined gap and a first predetermined gap are formed; And it may be a method for operating a composite heat carrier combustor having a jacket structure, including a sixth step of discharging while controlling the pressure conditions of the combustor with a pressure control valve through an exhaust pipe formed on the central axis of the inner jacket.

[0043] The solutions to the above problems can also be provided in a variety of combinations.

[0044] In the composite heat carrier combustor of the present invention having a double jacket type diffusion flame and a jacket structure in which water is in direct contact, a flame protection plate is installed on the upper part of the inner jacket of the combustor to prevent the flame of the burner from becoming unstable or going out due to the influence of water and steam sprayed upward through the nozzle of the inner jacket.

[0045] The flame protector is protected from high-temperature flames and combustion gases by continuous contact with steam and water sprayed upward from the inner jacket and water sprayed downward from the burner jacket.

[0046] In addition, the structure of the combustor consists of an outer jacket and an inner jacket, and the outer jacket and the inner jacket are made of a plant-fastened structure and can be separated.

[0047] It has the effect of producing non-fouling, direct contact steam for desalination and removal of harmful contaminants from water generated during conventional oil and gas processes.

[0048] In addition, since the above technology simultaneously injects a combustion gas mixture (composite heat carrier) together with steam generated by directly injecting water inside a high-temperature combustor into the oil sands reservoir, it has the effect of increasing the recovery rate by increasing the fluidity of oil sands bitumen in the reservoir by the composite heat carrier components such as CO2 together with the steam.

[0049] Additionally, since H2O is generated along with combustion gas during the fuel combustion process and supplied together with steam, the amount of water required to produce steam is reduced compared to existing technologies.

[0050] In addition, the contact area between the flame and water of the combustor can be adjusted, thereby controlling the temperature of each combustor area, which has the effect of uniformly adjusting the temperature of the produced steam and exhaust gas.

[0051] Figure 1 is a schematic diagram of a conventional diffusion type direct contact steam generator.

[0052] Fig. 2 is a cross-sectional view of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0053] Fig. 3 is a cross-sectional view of a burner of a composite heat carrier combustor with a jacket structure according to an embodiment of the present invention.

[0054] Fig. 4 is a plan view of the upper and lower portions of the outer jacket of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0055] FIG. 5 is a perspective view of an outer jacket of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0056] Fig. 6 is a perspective view of an inner jacket of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0057] Fig. 7 is a bottom perspective view of the inner jacket of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0058] Figure 8 is a graph showing changes in the amount of fuel, oxidizer, and water supplied over time during combustion operation of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0059] Figure 9 is a graph showing temperature changes in the upper, middle, lower and outlet portions of a combustor over time during operation of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0060] Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail, so that those with ordinary skill in the art can easily implement the present invention. However, when describing the operating principles of preferred embodiments of the present invention in detail, if a detailed description of a related known function or configuration is judged to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0061] Additionally, the same drawing reference numerals are used for parts with similar functions and actions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only direct connections but also indirect connections with other elements intervening. Furthermore, inclusion of a component does not exclude other components unless specifically stated otherwise, but rather implies the inclusion of additional components.

[0062] Additionally, any limitations or additions to any embodiment in this specification may be applied not only to that specific embodiment, but also to other embodiments.

[0063] Additionally, throughout the description and claims of the present invention, the singular includes the plural unless otherwise stated.

[0064] The present invention is described in detail with examples according to the drawings.

[0065] Figure 1 is a schematic diagram of a conventional diffusion type direct contact steam generator.

[0066] The proposed Power Water Treatment (PWTR) technology is a direct contact steam generator that incorporates a non-fouling technology that utilizes combustion and can cooling of the burner in a space where air, which is typically the oxidizer, is introduced.

[0067] Recycled water injection technology is a technology for directly vaporizing recycled water used in oil sands production. In Fig. 1, the core of the device is a fuel gas and air combustor located in a chamber. The chamber may be a wet chamber that cools the walls. Recycled water is preferably injected to cool the combustor chamber walls, while additional recycled water is injected downstream of the chamber. Contaminants in the produced water are converted into solid particles transported from the vapor-compatible combustion gas.

[0068] Figure 1 illustrates an embodiment of a steam generator capable of desalinating reused water at less than $1.50 / bbl. This technology produces a clean desalinated water stream for beneficial reuse, along with a solid waste stream. This represents a transformational step in the field of unconventional oil and gas production, with low cost, high water recovery, and no liquid emissions.

[0069] The steam generator directly contacts the hot flue gas with the produced water, completely vaporizing the water and generating solids that can be easily separated. The vaporized product is condensed and recovered as a clean condensate, preferably along with the water of combustion. The heat source is a compact air / gas combustor based on the rocket engine injector concept, but designed for high combustion efficiency with low NOx emissions. The combustor is housed in a chamber that uses recycled water from oil sands production as feedstock to cool the chamber walls, and makeup water is injected downstream.

[0070] Specifically, the steam generator illustrated in FIG. 1 comprises a combustion chamber having an inlet section. The inlet section comprises an oxidizer feed and a fuel feed. The oxidizer feed is supplied from a compressor, allowing for control of the feed pressure and flow rate. The oxidizer feed and the fuel feed are understood to be physical structures comprising piping or conduits and a supply source containing fuel and oxygen, respectively.

[0071] In this example, the oxidizer supply is a dedicated oxidizer supply to the combustion chamber, and the fuel supply is a dedicated fuel supply to the combustion chamber. Therefore, both fuel and oxygen are provided to the combustion chamber from the inlet section, without additional oxidizer supply and fuel supply downstream of the inlet section.

[0072] A combustor that generates steam by directly spraying water onto a flame and then directly injects the generated steam and combustion gas mixture (composite heat carrier) into the reservoir to extract bitumen from oil sands is called a composite heat carrier combustor or DCSG (Direct Contact Steam Generator).

[0073] This type of direct-mixing steam generator in the form of a diffusion flame had the disadvantage that the flame was not formed stably, making the vaporization and combustion of the directly injected water unstable.

[0074] Fig. 2 is a cross-sectional view of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0075] A composite heat carrier combustor having a jacket structure includes a burner (100); an outer jacket (200) in the form of a vertical tube formed by inserting the burner at the top; an inner jacket (300) formed inside the outer jacket with the same central axis; and an exhaust pipe (400) formed perpendicular to the central axis of the inner jacket, wherein water is directly injected inside the outer jacket and steam and exhaust gas are discharged through the lower portion of the exhaust pipe.

[0076] The burner can use various types of fuel. The fuel may be a hydrocarbon fuel. The fuel may preferably be a gaseous hydrocarbon fuel. The fuel may be natural gas or liquefied petroleum gas.

[0077] The burner can utilize a variety of oxidizers. The oxidizer can produce exhaust gas through a combustion reaction with the fuel, and is not limited to any specific type. Preferably, it can be air or oxygen.

[0078] Since the steam and exhaust gas of the present invention must be produced while maintaining the operating pressure of the combustor, if the oxidizer is oxygen and the steam production can be controlled by the supplied water, the operating conditions of the combustor can be precisely controlled.

[0079] The outer jacket and inner jacket constituting the combustion chamber of the above-mentioned combustor having a jacket structure may be formed in a double-tube structure. The double-tube structure with an empty interior allows a fluid such as water to pass through the interior.

[0080] Alternatively, the outer jacket and the inner jacket may have multiple fluid paths formed therein. This configuration is for controlling the temperature of the fluid and preventing deterioration of the jacket.

[0081] Fig. 3 is a cross-sectional view of a burner of a composite heat carrier combustor with a jacket structure according to an embodiment of the present invention.

[0082] In addition, the burner is a diffusion flame burner, and includes a burner upper portion (110) having a fuel supply port (111) through which fuel is supplied; an oxidizer supply port (112) through which an oxidizer is supplied; and a first water supply port (113) through which water is supplied; a burner lower portion (120) having one end connected to the burner upper portion and inserted into the interior of the outer jacket; one or more fuel nozzles (121) formed on the central axis of the other end of the burner lower portion; one or more oxidizer nozzles (122) formed in a ring shape around the fuel nozzle; and one or more first water nozzles (123) formed in a ring shape around the oxidizer nozzle.

[0083] The arrangement of the fuel nozzle and oxidizer nozzle formed at the bottom of the burner to form a diffusion flame can be freely adjusted in arrangement form and nozzle diameter as long as the combustion conditions can be stabilized.

[0084] Generally, the amount of oxidizer supplied is large based on the amount of fuel supplied, and preferably, the amount of air supplied is large. However, the configuration in which the fuel nozzle is arranged in a ring with the oxidizer nozzles placed on the central axis is common, but is not limited thereto.

[0085] When air is introduced as an oxidizer, the stoichiometric demand for combustion can be supplied at a higher flow rate. To maintain the temperature and pressure inside the combustion chamber of the combustor while producing a constant amount of steam and exhaust gas, the amount of water supplied must also be controlled. In particular, the amount of water injected from the first and second water nozzles must be adjusted to maintain constant operation and steam and exhaust gas production.

[0086] The shape of the above nozzle may be a shape for atomizing the fluid or a shape for spraying it over a wide area.

[0087] In addition, it includes a fuel supply pipe (130) for supplying fuel to the fuel supply port; an oxidizer supply pipe (140) for supplying the oxidizer to the oxidizer supply port; and a first water supply pipe (150) for supplying the water to the first water supply port; and the first water supply pipe may be branched from a second water supply pipe (220) for supplying the water to one or more second water supply ports (210) formed at the lower portion of the outer jacket.

[0088] The above fuel supply pipe may additionally be provided with an MFC (Mass flow controller), a pressure regulating valve, a pressure transmitter, and a fuel storage tank to control the fuel supply amount.

[0089] The above oxidizer supply pipe may additionally be provided with an MFC (Mass flow controller), a pressure control valve, a static pressure transmitter, and an oxidizer storage tank to control the amount of oxidizer supplied.

[0090] The first water supply pipe and the second water supply pipe may additionally be provided with an MFC (Mass flow controller), a pressure regulating valve, a static pressure transmitter, a water pump, and a water storage tank to control the amount of water supplied to the water supply port and the second water supply port.

[0091] Fig. 4 is a plan view of the upper and lower portions of the outer jacket of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0092] In addition, a burner insertion part (230) having a hole formed in the upper part of the outer jacket into which the lower part of the burner is inserted; one or more circulation outlets (231) protruding in a horizontal (x-axis) direction from the outer surface of the burner insertion part; a flow path (232) formed in the outer jacket so that the water flowing into the second water supply port can move upward; the water rising to the burner insertion part (230) can be discharged through the circulation outlet and circulated to the inner jacket through a vertical discharge pipe (232) formed in a vertical (y-axis) direction.

[0093] The above burner insertion part is not limited in shape as long as various types of burners can be stably inserted in the direction of the combustion chamber. In addition, a gasket can be formed to prevent leakage between the inserted burner and the burner insertion part.

[0094] The above circulation outlet is connected to a vertical discharge pipe for transporting water that has risen through the interior of the outer jacket back to the lower inner jacket. The above circulation outlets may be formed one at a time in a 90-degree direction of the vertical discharge pipe having a circular cross-section. A valve capable of controlling the circulation outlets may be formed according to the water supply flow rate conditions and the steam production flow rate conditions.

[0095] In addition, the vertical discharge pipe may be extended in the vertical (y-axis) direction below the lower end of the outer jacket, and then bent to be introduced into one or more circulation inlets (310) formed in the inner jacket.

[0096] The above-mentioned flow path refers to the empty space of the outer jacket if the inner part of the outer jacket is hollow in the form of a double jacket. In addition, if multiple flow paths are formed vertically upward inside the outer jacket, the flow paths are gathered toward the burner insertion part.

[0097] A portion of the above burner insert may have a space formed therein for sending water rising through the passage to the circulation outlet. Alternatively, the passage and the circulation outlet may be correspondingly connected.

[0098] In addition, the vertical discharge pipe may be extended in the vertical (y-axis) direction below the lower end of the outer jacket, and then bent to be introduced into one or more circulation inlets (310) formed in the inner jacket.

[0099] Since the vertical discharge pipe extends below the lower end of the outer jacket, it is natural that the frame supporting the outer jacket must have a height that can include the vertical discharge pipe.

[0100] FIG. 5 is a perspective view of an outer jacket of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0101] In addition, the outer jacket has a tube shape with a bottom surface (240) that is blocked on the opposite side in the vertical (y-axis) direction where the burner insertion port is formed; one end of the burner insertion port protrudes upward to correspond to the length of the lower burner to be inserted in the y-axis direction, and the end of the burner insertion port is aligned with the upper inner surface of the outer jacket, and may have a rounded shape up to a predetermined position on the vertical surface of the outer jacket based on the end of the burner insertion portion.

[0102] The above outer jacket is shaped like a water bottle and has a burner insert formed at the top toward the water bottle outlet. The inner surface of the combustion chamber may be formed with heat exchange fins (not shown) to increase heat exchange between the sprayed water and the flame.

[0103] The above heat exchange fins can form a downward swirling flow in the vertical (y-axis) direction of the exhaust gas in the form of a guide vane, thereby moving the generated steam and exhaust gas toward the inner jacket formed at the bottom.

[0104] Fig. 6 is a perspective view of an inner jacket of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0105] The above inner jacket is formed in a tubular structure with one end blocked, with the open portion facing downward in the vertical (y-axis) direction, and a first predetermined interval (I) is formed in the vertical (y-axis) direction from the bottom surface. F1 ) is formed, and the circulation inlet formed by contacting the bottom surface may be the circulation inlet.

[0106] The above circulation inlet is formed in multiple numbers in a form that supports the inner jacket. If the cross-section of the inner jacket is circular, four can be formed at 90-degree intervals around the central axis, and can be formed more densely by narrowing the angle depending on the load.

[0107] A tube-shaped circulation inlet support tube (not shown) that can support the inner jacket while surrounding the circulation inlet can be formed. However, the thickness of the circulation inlet support tube cannot exceed half the diameter of the circulation inlet.

[0108] A support (340) capable of supporting the inner jacket may be formed in the annular portion where the above-mentioned circulation inlet is formed. The support may be in the form of a rectangular bar or a round bar. In addition, the support may have a guide vane shape whose cross-section forms a flow in a specific direction.

[0109] Fig. 7 is a bottom perspective view of the inner jacket of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0110] In addition, the upper surface (320) in the vertical (y-axis) direction of the inner jacket may be formed in a round shape and one or more second water nozzles (321) may be formed around the central axis in the vertical (y-axis) direction of the upper surface.

[0111] Since the second water nozzle must spray water vertically upwards from the combustion chamber, the spray velocity may be faster than that of the first water nozzle. In addition, since the sprayed water must be spread over a wide area, a resistor (not shown) may be formed at the front end of the second water spray nozzle.

[0112] In addition, a flame protection plate (330) protruding upwardly on the vertical (y-axis) direction central axis of the upper surface may be formed.

[0113] Since the above flame protection plate is formed at a certain distance from the upper surface, a support bar (331) is formed to support the flame protection plate. The support bar connects and supports the flame protection plate and the upper surface in multiple numbers.

[0114] The above support bar may be made of a non-thermal conductive material.

[0115] A second predetermined gap (I) is provided between the inner surface of the outer jacket and the outer surface of the inner jacket. F2) is formed, and the steam and exhaust gas generated after the combustion reaction can move downward in the vertical (y-axis) direction through the second predetermined interval and flow into the exhaust pipe in the shape of a tube formed along the same axis as the central axis of the inner jacket through the first predetermined interval.

[0116] A method for operating a composite heat carrier combustor with a jacket structure comprises: a first step in which a combustion process is performed by supplying fuel while supplying an oxidizer and operating an igniter to form a flame at the bottom of a burner; a second step in which a pump is started to supply water to a water supply port of the burner and a second water supply port of an outer jacket; a third step in which the water supplied to the water supply port is sprayed in the direction of the flame through the first water nozzle, and the water supplied to the second water supply port is circulated on the outer surface of the outer jacket and then supplied to the circulation inlet of the inner jacket; a fourth step in which the water supplied to the circulation inlet is sprayed into a combustion chamber (250) through a second water nozzle formed on the upper surface of the inner jacket; a fifth step in which steam and exhaust gas generated through the combustion process move inwardly of the inner jacket through a portion in which a second predetermined gap and a first predetermined gap are formed; And it may be a method for operating a composite heat carrier combustor having a jacket structure, including a sixth step of discharging while controlling the pressure conditions of the combustor with a pressure control valve through an exhaust pipe formed on the central axis of the inner jacket.

[0117] While supplying an oxidizer (oxygen, etc.), the ignitor is operated to ignite the burner at the top of the combustor while supplying fuel (NG, etc.).

[0118] After the burner is ignited, the pump is started to supply water through the outer jacket of the combustor and the burner jacket. At this time, the amount of water supplied to the outer jacket of the combustor and the burner jacket is adjusted to an appropriate ratio using a flow control valve.

[0119] First, water supplied to the burner jacket at the top of the combustor serves to cool the burner so that the burner is not overheated by the flame, and then is sprayed into the combustor through a number of nozzles installed at the end of the burner jacket.

[0120] The water supplied to the outer jacket of the combustor body is supplied from the bottom by branching into multiple pipes (6) to prevent local hot spots from occurring in the outer jacket.

[0121] Water supplied through multiple pipes from the lower part of the outer jacket of the combustor evenly fills the jacket and moves upward, branches out into multiple pipes at the upper end of the combustor to exit the outer jacket, and then moves again through multiple pipes to the lower part of the combustor to be supplied to the inner jacket of the combustor, and is finally injected into the inside of the combustor through multiple nozzles at the upper part of the inner jacket.

[0122] The water supplied to the outer jacket is primarily heated by heat exchange with the combustion gas, and as it passes through the higher temperature inner jacket, it is heated secondarily, and when it is sprayed through the nozzle, some of it is sprayed in the form of steam and some is sprayed in the form of water.

[0123] In addition, a flame protector (9) is installed at the outlet sprayed from the inner jacket to prevent the flame of the burner from being extinguished by water and steam sprayed from the inner jacket, and this flame protector is protected from high-temperature flames by steam + water sprayed from the bottom and water sprayed from the top.

[0124] High-temperature combustion gas and steam generated inside the combustor are discharged to the outside of the combustor along a path that contacts the outer jacket and the inner jacket as indicated by the arrows in Fig. 2. A pressure regulating valve is installed in the outlet pipe to adjust the operating pressure of the combustor as needed.

[0125] (Example)

[0126] Steam and exhaust gas generation operation of a jacket-structured composite heat carrier combustor was performed using a diffusion flame burner.

[0127] The burner used natural gas as fuel and oxygen as the oxidizer.

[0128] Figure 8 is a graph showing changes in the amount of fuel, oxidizer, and water supplied over time during combustion operation of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0129] Looking at Figure 8, it can be confirmed that combustion proceeds normally while the supply of fuel, oxidizer, and water remains constant over a period of two hours.

[0130] Figure 9 is a graph showing temperature changes in the upper, middle, lower and outlet portions of a combustor over time during operation of a composite heat carrier combustor having a jacket structure according to an embodiment of the present invention.

[0131] In Fig. 9, it can be confirmed that the combustion chamber is operated while maintaining the temperatures at the upper, middle, lower, and exhaust pipe outlets constant.

[0132] The water injected into the combustor to produce steam passes through some of the burner jackets before being injected (approximately 10 to 20%), but most of the water (approximately 80 to 90%) passes through the outer jacket and then the inner jacket, where it is sufficiently heated. As it is injected into the combustor through the nozzle, it quickly turns into steam, contributing to improving the vaporization rate (the steaming rate of the supplied water).

[0133] In order to produce steam through direct contact between high-temperature flame (combustion gas) and water, water is supplied from two places. One is to spray water that has passed through the burner jacket from the top downward through a nozzle to protect the burner, and the other is to spray water (including some steam) that has been heated while passing through the outer and inner jackets upward through a nozzle from the top of the inner jacket.

[0134] By configuring the surface of the combustor with an external jacket of a water-cooled structure, it has a structural feature that can significantly reduce the size of the combustor by eliminating the need to install a separate refractory material to withstand the high temperature inside the combustor.

[0135] By operating the pressure of the outer jacket of the combustor at a level slightly higher than the operating pressure inside the combustor, even if the inner surface of the outer jacket is damaged, the high-temperature combustion gas and steam do not leak out through the outer jacket, but rather the water in the outer jacket flows into the combustor through the damaged area.

[0136] Anyone with ordinary knowledge in the field to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

[0137] (Explanation of symbols)

[0138] 100: Burner

[0139] 110: Top of burner

[0140] 111: Fuel supply port

[0141] 112: Oxidizer supply port

[0142] 113: Water supply outlet

[0143] 120: Lower burner

[0144] 121: Fuel nozzle

[0145] 122: Oxidizer nozzle

[0146] 123: First water nozzle

[0147] 130: Fuel supply pipe

[0148] 140: Oxidizer supply pipe

[0149] 150: First water supply pipe

[0150] 200: Outer jacket

[0151] 210: Second water supply outlet

[0152] 220: Second water supply pipe

[0153] 230: Burner insert

[0154] 231: Circulation outlet

[0155] 232: Vertical discharge pipe

[0156] 240: Floor surface

[0157] 250: Combustion chamber

[0158] 300: Inner jacket

[0159] 310: Circulation inlet

[0160] 320: Top surface

[0161] 321: Second water nozzle

[0162] 330: Flame shield

[0163] 331: Support bar

[0164] 340: Support

[0165] 400: Exhaust pipe

[0166] I F1 : First predetermined interval

[0167] I F2 : Second predetermined interval

Claims

1. Burner (100); An external jacket (200) in the form of a vertical tube formed by inserting the burner at the top; An inner jacket (300) having the same central axis formed inside the outer jacket; and It includes an exhaust pipe (400) formed vertically to the central axis of the inner jacket; A composite heat carrier combustor having a jacket structure in which water is directly injected into the inside of the outer jacket and steam and exhaust gas are discharged to the lower part of the exhaust pipe.

2. In paragraph 1, The above burner is a diffusion flame burner, Fuel supply port (111) through which fuel is supplied; An oxidizer supply port (112) through which an oxidizer is supplied; and The upper part of the burner (110) in which the first water supply port (113) through which water is supplied is formed; The burner lower part (120) is connected to the upper part of the burner and inserted into the inside of the outer jacket; One or more fuel nozzles (121) formed on the central axis of the other end of the lower burner; One or more oxidizer nozzles (122) formed in an annular shape around the fuel nozzle; and A composite heat carrier combustor having a jacket structure including one or more first water nozzles (123) formed in an annular shape around the oxidizer nozzle.

3. In paragraph 2, A fuel supply pipe (130) that supplies fuel to the above fuel supply port; An oxidizer supply pipe (140) that supplies the oxidizer to the oxidizer supply port; It includes a first water supply pipe (150) that supplies water to the first water supply port; A composite heat carrier combustor having a jacket structure in which the first water supply pipe branches from a second water supply pipe (220) that supplies water to one or more second water supply ports (210) formed at the bottom of the outer jacket.

4. In paragraph 3, A burner insertion part (230) having a hole formed in the upper part of the outer jacket into which the lower burner part is inserted; One or more circulation outlets (231) protruding in the horizontal (x-axis) direction from the outer surface of the burner insert; The outer jacket has a path formed to allow the water flowing into the second water supply port to move upward; A composite heat carrier combustor having a jacket structure in which the water that has risen to the burner insertion portion (230) is discharged through the circulation outlet and circulated to the inner jacket through a vertical discharge pipe (232) formed in the vertical (y-axis) direction.

5. In paragraph 4, A composite heat carrier combustor having a jacket structure in which the vertical exhaust pipe extends in the vertical (y-axis) direction below the lower end of the outer jacket, is bent, and then flows into one or more circulation inlets (310) formed in the inner jacket.

6. In paragraph 5, The above outer jacket has a tube shape with a bottom surface (240) that is blocked on the opposite side in the vertical (y-axis) direction where the burner insertion port is formed; One end of the above burner insertion port protrudes upward to correspond to the length in the y-axis direction of the lower burner into which it is inserted, A composite heat carrier combustor having a jacket structure in which the end of the burner insertion port coincides with the upper inner surface of the outer jacket and has a rounded shape up to a predetermined position on the vertical surface of the outer jacket based on the end of the burner insertion portion.

7. In paragraph 6, The above inner jacket is formed in a tubular structure with one end closed, with the open portion facing downward in the vertical (y-axis) direction. On the above floor surface, a first predetermined interval (I) is provided in the vertical (y-axis) direction F1 ) is formed, A composite heat carrier combustor having a jacket structure formed by contacting the above-mentioned bottom surface, which is the above-mentioned circulation inlet.

8. In paragraph 7, The upper surface (320) in the vertical (y-axis) direction of the inner jacket is formed in a round shape, A composite heat carrier combustor having a jacket structure in which at least one second water nozzle (321) is formed around the vertical (y-axis) central axis of the upper surface.

9. In paragraph 8, A composite heat carrier combustor having a jacket structure in which a flame protection plate (330) is formed protruding upward on the vertical (y-axis) direction central axis of the upper surface.

10. In paragraph 9, A second predetermined gap (I) is provided between the inner surface of the outer jacket and the outer surface of the inner jacket. F2 ) is formed and the steam and exhaust gas generated after the combustion reaction move downward in the vertical (y-axis) direction through the second predetermined interval and flow into the exhaust pipe in the shape of a tube formed along the same axis as the central axis of the inner jacket through the first predetermined interval. A composite heat carrier combustor having a jacket structure.

11. In paragraph 9, The temperature of the upper region where the flame is formed inside the outer jacket is 1000°C to 1200°C, The temperature of the middle region around the flame protection plate inside the outer jacket is 500°C to 700°C, A composite heat carrier combustor having a jacket structure in which the temperature of the lower region, which is located below the second predetermined interval in the vertical (y-axis) direction inside the outer jacket, is 300°C to 500°C.

12. Burner (100); An external jacket (200) in the form of a vertical tube formed by inserting the burner at the top; An inner jacket (300) having the same central axis formed inside the outer jacket; and It includes an exhaust pipe (400) formed vertically to the central axis of the inner jacket; The above burner is a composite heat carrier combustor having a jacket structure in which a flame is formed inside the outer jacket and water is directly injected into the flame to discharge steam and exhaust gas to the lower part of the exhaust pipe.

13. The first stage is a combustion process in which a flame is formed at the bottom of the burner by supplying fuel while supplying an oxidizer and operating the igniter; A second step of supplying water to the water supply port of the burner and the second water supply port of the external jacket by starting the pump; The water supplied to the water supply port is sprayed in the direction of the flame through the first water nozzle, and the water supplied to the second water supply port circulates around the outer surface of the outer jacket and is then supplied to the circulation inlet of the inner jacket in the third step; The fourth step is that the water supplied to the circulation inlet is sprayed into the combustion chamber (250) through the second water nozzle formed on the upper surface of the inner jacket; A fifth step in which the steam and exhaust gas generated through the above combustion process move to the inside of the inner jacket through a portion where the second predetermined interval and the first predetermined interval are formed; and A method for operating a composite heat carrier combustor having a jacket structure, comprising a sixth step of discharging while controlling the pressure conditions of the combustor with a pressure regulating valve through an exhaust pipe formed on the central axis of the inner jacket.

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