CN215408574U - Heat exchange device for coal underground gasification process - Google Patents
Heat exchange device for coal underground gasification process Download PDFInfo
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- CN215408574U CN215408574U CN202121329829.8U CN202121329829U CN215408574U CN 215408574 U CN215408574 U CN 215408574U CN 202121329829 U CN202121329829 U CN 202121329829U CN 215408574 U CN215408574 U CN 215408574U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a heat exchange device for an underground coal gasification process, which comprises a coolant conveying pipe, a heat exchanger, a centralizer, an instrument pipe column and a coolant spray head, wherein the coolant conveying pipe comprises an inner pipe and an outer pipe, the inner pipe is inserted into the outer pipe and used for conveying low-temperature coolant, at least one check valve is arranged in the inner pipe, the outer pipe is used for conveying high-temperature coolant, the heat exchanger is arranged on the outer pipe, the centralizer is fixed on the outer wall of the outer pipe and used for underground centralization of the heat exchange device and fixation of the instrument pipe column, the instrument pipe column is arranged on the outer side of the outer pipe and fixed on the centralizer, and the coolant spray head is arranged at the right end of the outer pipe. The method can effectively control the temperature of the underground synthesis gas, avoid the fault and damage of underground equipment, reduce the consumption of the coolant, recycle the waste heat of the high-temperature synthesis gas, obviously reduce the operation difficulty and the project construction cost in the underground coal gasification production process, and bring progress for the prior art.
Description
Technical Field
The utility model belongs to the technical field of coal underground gasification process equipment, and particularly relates to a heat exchange device for a coal underground gasification process.
Background
Coal underground gasification (ISC) is a process in which coal is directly converted by combustion and gasification reactions of an underground coal seam in the presence of an oxidant into a product gas, commonly referred to as syngas, which can then be used as a feedstock for a variety of applications, including fuel production, chemical production, and power generation, among others. The underground coal gasification technology is suitable for most coal reserves. This technique is clearly attractive in view of the ever more stringent environmental requirements associated with the mining industry and in view of the associated labour and capital costs. The coal gasification process is a process of converting coal into synthesis gas through a series of chemical reactions.
The surface well drilling is directly communicated with the coal bed, and an effective channel is provided for oxidant injection and product gas production. A pair of wells communicates or extends horizontally underground to form a substantially horizontal well bore (also referred to simply as a coal seam well or communication passage). The channels facilitate oxidant injection, burnout zone growth, and product gas transport. One well for oxidant injection is called an "injection well" and the other well for production of product gas is called a "production well". Both directional horizontal and vertical wells may be used as injection or production wells. Coal underground gasification (ISC) may also require the use of one or more vertical wells (e.g., function and auxiliary wells) between the injection and production wells.
When injection wells, production wells, and horizontal channels connect coal seams, this configuration is referred to as an underground coal gasification (ISC) unit or well pair. The ISC unit includes a combustion zone, a gasification zone, and a pyrolysis zone. Wherein the combustion zone is near an oxidant injection point in the coal seam; the gasification zone surrounds the combustion zone in a radial shape or is arranged at the downstream of the combustion zone, and coal is gasified and partially oxidized in the gasification zone so as to generate product gas; the pyrolysis zone is downstream of the gasification zone where the pyrolysis reaction of the coal typically takes place. The hot product gas flows downstream from the gasification zone and is ultimately transported to the surface from the product wellhead.
In the prior art, the problems faced by the underground coal gasification technology mainly include: in the process of conveying the crude synthesis gas to the ground surface underground, the temperature of the crude synthesis gas can exceed 700 ℃, and the continuous high temperature leads the underground equipment material to reach the yield stress failure point of the material, thereby destroying the continuous production of the underground coal gasification process.
SUMMERY OF THE UTILITY MODEL
In order to solve at least one technical problem in the prior art, the present invention provides a novel heat exchange device for an underground coal gasification process, which has a simple structure, can effectively and actively control the temperature of the underground synthesis gas, and can avoid the underground equipment from being broken down and damaged.
The utility model is realized by the following technical scheme:
a heat exchange device for coal underground gasification technology, including coolant conveying pipe, heat exchanger, centralizer, instrument tubular column and coolant shower nozzle, the coolant conveying pipe includes inner tube and outer tube, the inner tube is inserted and is located in the outer tube for carry low temperature coolant, install at least one check valve in the inner tube, the outer tube is used for carrying high temperature coolant, heat exchanger install in on the outer tube, the centralizer is fixed in be used for heat exchange device's centering in the pit on the outer wall of outer tube with instrument tubular column's is fixed, instrument tubular column locates the outside of outer tube just is fixed in the centralizer, the coolant shower nozzle install in the right-hand member of outer tube.
As a further improvement of the above technical solution, the coolant nozzle includes a nozzle body, a protective sheath, a spring lock, and a pressure-opening nozzle, the nozzle body is connected to the right end of the outer tube in a sealing manner and communicates with the inside of the outer tube, the protective sheath is disposed on the nozzle body, one end of the spring lock is connected to the right end of the nozzle body, the other end of the spring lock is connected to the inside of the protective sheath, and the pressure-opening nozzle is installed between the nozzle body and the protective sheath.
As a further improvement of the above technical solution, the number of the pressure-opening nozzles is 5 to 10, one part of the pressure-opening nozzles is disposed on the side surface of the head body, and the other part of the pressure-opening nozzles is disposed at the end of the head body.
As a further improvement of the above technical solution, the shower head body and the outer tube are integrated.
As a further improvement of the technical scheme, the outer pipe and the inner pipe are connected into an integrated concentric continuous pipe.
As a further improvement of the technical scheme, two check valves are installed in the inner pipe.
As a further improvement of the technical scheme, the left end of the outer tube is provided with a thread buckle.
As a further improvement of the above technical solution, the heat exchanger is a fan blade heat exchanger, and is connected to the outer tube by a screw thread or a slip.
As a further improvement of the above technical solution, the centralizer is a pure rigid centralizer, and the pure rigid centralizer is installed between the fan blade heat exchanger and the coolant nozzle.
As a further improvement of the technical scheme, the instrument tube column comprises a distributed temperature sensor, a pressure sensor and an acoustic wave sensor and is used for controlling production process parameters of underground coal gasification.
The utility model has the beneficial effects that: the utility model discloses a heat exchange device for an underground coal gasification process, which comprises a coolant conveying pipe, a heat exchanger, a centralizer, an instrument pipe column and a coolant spray head, wherein the coolant conveying pipe comprises an inner pipe and an outer pipe, the inner pipe is inserted into the outer pipe and used for conveying low-temperature coolant, at least one check valve is installed in the inner pipe, the outer pipe is used for conveying high-temperature coolant, the heat exchanger is installed on the outer pipe, the centralizer is fixed on the outer wall of the outer pipe and used for underground centralization of the heat exchange device and fixation of the instrument pipe column, the instrument pipe column is arranged on the outer side of the outer pipe and fixed on the centralizer, and the coolant spray head is installed at the right end of the outer pipe. When the heat exchange device is used for implementing the underground coal gasification process, the temperature of underground synthetic gas can be effectively and actively controlled, the underground equipment is prevented from being broken down and damaged, direct heat exchange and indirect heat exchange are actively controlled, the consumption of a coolant is reduced, the waste heat of the high-temperature synthetic gas is recycled, the operation difficulty and the project construction cost in the underground coal gasification production process are obviously reduced, and the improvement is brought to the prior art.
Drawings
FIG. 1 is a schematic cross-sectional view of a heat exchange apparatus for an underground coal gasification process according to an embodiment of the present invention.
Wherein: 1. coolant conveying pipe, 2, heat exchanger, 3, check valve, 4, centralizer, 5, pressure opening nozzle, 6, spring lock catch, 7, protective sheath, 8, instrument column, 9, screw thread buckle, 10, low temperature coolant, 11, high temperature coolant, 12, high temperature synthetic gas, 13, low temperature synthetic gas.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the embodiments of the present invention.
The problems faced by the current underground coal gasification technology mainly include:
a) in the process of conveying the crude synthesis gas to the ground surface underground, the temperature of the crude synthesis gas can exceed 700 ℃, and the continuous high temperature leads the underground equipment material to reach the yield stress failure point of the material, thereby destroying the continuous production of the underground coal gasification process.
b) Sustained high temperatures can cause thermal expansion and thermal elongation limitations of the downhole cement casing, leading to casing and/or cement bond failure, disrupting the continuous production of the coal gasification process.
c) The continuous high temperature can cause thermal expansion and thermal elongation of the underground free casing pipe and the pipe column, so that the free casing pipe and the pipe column are buckled, and the continuous production of the underground coal gasification process is damaged.
d) The sustained high temperatures can exacerbate the degree of corrosion of the downhole equipment materials, leading to damage or failure of the well bore integrity of the production well, disrupting the continuous production of the coal gasification process.
The present invention thus proposes a heat exchange device for an underground coal gasification process, said heat exchange device being located within an ISC product well.
The heat exchange device for the underground coal gasification process according to the embodiment of the utility model is specifically described below with reference to fig. 1.
As shown in fig. 1, the heat exchange device for the coal underground gasification process according to the embodiment of the present invention includes a coolant conveying pipe 1, a heat exchanger 2, a centralizer 4, an instrument column 8 and a coolant nozzle, where the coolant conveying pipe 1 includes an inner pipe and an outer pipe, the inner pipe is inserted into the outer pipe and used for conveying low-temperature coolant, at least one check valve 3 is installed in the inner pipe, the outer pipe is used for conveying high-temperature coolant, the heat exchanger 2 is installed on the outer pipe, the centralizer 4 is fixed on the outer wall of the outer pipe and used for downhole centralization of the heat exchange device and fixation of the instrument column 8, the instrument column 8 is installed outside the outer pipe and fixed to the centralizer 4, and the coolant nozzle is installed at the right end of the outer pipe. The low-temperature coolant needed for heat exchange is conveyed to the underground through the coolant conveying pipe 1, and meanwhile, the high-temperature coolant after heat exchange is reversely conveyed to the surface for treatment. Indirect heat exchange between the downhole cryogenic coolant and the high temperature syngas is achieved by heat exchanger 2. Downhole centralization of the heat exchanger 2 is achieved by centralizers 4. Direct heat exchange between the low temperature coolant and the high temperature syngas is achieved through the coolant spray heads. The production process parameters of the underground coal gasification are controlled through the instrument pipe column 8.
Therefore, when the heat exchange device disclosed by the utility model is used for implementing the underground coal gasification process, the temperature of underground synthetic gas can be effectively and actively controlled, the underground equipment is prevented from being broken down and damaged, direct heat exchange and indirect heat exchange are actively controlled, the consumption of a coolant is reduced, the waste heat of the high-temperature synthetic gas is recycled, the operation difficulty and the project construction cost in the underground coal gasification production process are obviously reduced, and the improvement is brought to the prior art.
Further, the coolant nozzle comprises a nozzle body, a protective sheath, a spring lock catch 6 and a pressure opening nozzle 5, the nozzle body is connected to the right end of the outer tube in a sealing mode and communicated with the inner side of the outer tube, the protective sheath 7 is sleeved on the nozzle body, one end of the spring lock catch 6 is connected to the right end of the nozzle body, the other end of the spring lock catch is connected to the inner side of the protective sheath 7, the pressure opening nozzle 5 is installed between the nozzle body and the protective sheath 7, and the coolant nozzle is used for achieving direct heat exchange between low-temperature coolant and high-temperature synthetic gas in the well. Thereby making the heat exchange effect of the coolant shower head better.
In one embodiment, the number of the pressure-opening nozzles 5 is 5 to 10, and a portion thereof is provided at a side surface of the head body and another portion thereof is provided at an end portion of the head body. For example, when 5 pressure-activated nozzles 5 are provided, 4 are provided on the side surface of the head body and one is provided on the end portion of the head body. Thereby making the heat exchange effect of the coolant shower head better.
In one embodiment, the coolant injector tip has an outer diameter of 3-4.5 inches, and the outer tube has an outer diameter corresponding to 3-4.5 inches. Wherein, 4-8 nozzles are uniformly distributed on the side surface of the spray head, and 1-2 nozzles are distributed on the top of the spray head. The coolant nozzle is made of 316L stainless steel or a higher-grade corrosion-resistant high-nickel-chromium alloy material. The protective sheath 7 is tensioned by the spring catch 6 for isolating the pressure-opening nozzle 5 from the high-temperature synthesis gas and for protecting the pressure-opening nozzle 5 from clogging and damage. By increasing the injection pressure of the coolant, the pressure on the coolant spray head is opened to open the nozzle 5 and the protective sheath 7. When the injection pressure of the coolant reaches a set value, the nozzle on the side surface of the spray head is completely exposed to the high-temperature synthesis gas, and the direct heat exchange process is implemented.
In one embodiment, the spray head body and the outer tube are integrated for easy manufacturing and improved sealing. The outer pipe and the inner pipe are connected into an integrated concentric continuous pipe.
In one embodiment, two check valves 3 are mounted in the inner tube.
Furthermore, the left end of the outer tube is provided with a thread buckle 9.
In actual use, the upstream ground coolant pipe injection system apparatus is threaded into the coolant delivery pipe 1. The check valves 3 are used to maintain the pressure in the cryogenic coolant delivery pipe 1 and prevent reverse gas flow into the coolant delivery pipe 1, wherein the plurality of check valves 3 are used primarily for redundancy. The non-return valve 3 may be any type of non-return valve 3 known to be suitable to the person skilled in the art, e.g. a spring flapper valve or a ball + spring type, etc.
In one embodiment, the heat exchanger 2 is a fan blade heat exchanger 2 connected to the outer tube by threads or slips. For indirect heat exchange between the downhole cryogenic coolant and the high temperature syngas. The outer diameter may be 3-4.5 inches, including at least 6 blades, and the heat exchanger 2 may be 5-10 meters in length. The blade heat exchanger 2 is made of 316L stainless steel or a higher-grade corrosion-resistant high-nickel-chromium alloy material (such as Kenell alloy 600, Monel alloy 400, alloy steel 28, higher-grade alloy steel and the like).
In one embodiment, the centralizer 4 is a purely rigid centralizer 4, the purely rigid centralizer 4 being mounted between the fan blade heat exchanger 2 and the coolant spray head. For centralizing the heat exchange device and for securing the instrumentation string 8. A purely rigid centralizer 4 is mounted between the fan blade heat exchanger 2 and the coolant spray head. The strength of the pure rigid centralizer 4 enables the heat exchange device to be separated from a sleeve in the well, and effectively reduces friction and torque when the heat exchange device is lifted and lowered in the well. The size, number and shape of the fins may be selected according to the project well bore design and production operation requirements. Additional tungsten carbide hard facings, rollers or spring rollers may be added to the fins of the purely rigid centralizer 4 to reduce the frictional drag effects encountered during tripping operations in the well.
Further, the instrumentation column 8 comprises a distributed temperature sensor, a pressure sensor and a sound wave sensor, and is used for controlling the production process parameters of the coal underground gasification. The distributed temperature sensor is used for monitoring the temperature of the synthesis gas before and after cooling and controlling the injection amount of the coolant; the distributed pressure sensor is used for monitoring the pressure of the underground synthesis gas; distributed acoustic sensors are used to monitor downhole emergencies such as pipe string damage, pipe string plugging, etc.
In a particular embodiment, the fan blade heat exchanger 2 is screwed downstream of the coolant duct 1. 2 check valves 3 are arranged in the coolant conveying pipe 1 and are respectively positioned at the upstream and the downstream of the fan blade heat exchanger 2. A purely rigid centralizer 4 is installed downstream of the flabellum heat exchanger 2 to assist in securing the instrumentation string 8 and to reduce friction during tripping operations within the heat exchange well. The coolant nozzles are installed downstream of the purely rigid centralizer 4.
When the temperature of the synthesis gas rises in the production process of the underground gasification furnace, the control system starts the heat exchange device through a signal of the instrument pipe column 8. The low temperature coolant 10 is delivered downhole through the inner tube of the coolant delivery tube 1 and indirectly exchanges heat with the high temperature syngas 12 through the fan blade heat exchanger 2. The high-temperature coolant 11 after indirect heat exchange is circulated to the surface of the ground through the outer pipe of the coolant conveying pipe 1 for treatment. And the low-temperature synthesis gas 13 after the high-temperature synthesis gas 12 passes through the heat exchange device is continuously conveyed to the surface through a downhole casing. When the indirect heat exchange process implemented by the fan blade heat exchanger 2 is limited, the temperature of the instrument pipe column 8 exceeds a set value, the injection pressure of the coolant is increased, and the pressure on the coolant spray head is opened to open the spray nozzle 5. At the same time, the pressure pushes the spring catch 6, opening the protective sheath 7. When the coolant injection pressure reaches a set value, the pressure opening nozzle 5 at the side of the nozzle is completely exposed to the high-temperature synthesis gas 12, and the direct heat exchange process is performed.
It should be noted that embodiments of the present invention provide heat exchange devices designed at pressures that meet the pressure requirements of all standard industrial and non-industrial regulatory agencies, 1,000 and 25,000 psi. The design temperature of the heat exchange device can reach 350-500 ℃ at most. The materials selected for the heat exchange device may be selected according to the oil and gas industry API specification corrosion protection rating, including but not limited to AA (for substantially non-corrosive liquids or gases), BB (for corrosion resistance of 13-chrome stainless steel internals, also for minor corrosion of interior surfaces), CC (for any liquid or gaseous state that meets 13-chrome stainless steel), DD (for cryogenic acid gases and oils, H2S corrosion resistance, for other chemicals, products, or hydrocarbons in the presence of H2S), EE (for acid gases and oils, H2S corrosion resistance, for other chemicals, products, or hydrocarbons in the presence of H2S), FF (for acid gases, oils, other chemicals, products, or hydrocarbons when CO2 exceeds the H2S content), or the like. Design specification levels (PSLs) for heat exchange devices include, but are not limited to, PSL-1, PSL-2, and PSL-3 that meet API specifications. The design dimensions of the heat exchange device include, but are not limited to, 5-20 inches.
Therefore, according to the heat exchange device for the coal underground gasification process, provided by the embodiment of the utility model, when the coal underground gasification process is implemented, the temperature of underground synthetic gas can be effectively and actively controlled, the underground equipment is prevented from being broken down and damaged, direct heat exchange and indirect heat exchange are actively controlled, the consumption of a coolant is reduced, the waste heat of the high-temperature synthetic gas is recycled, the operation difficulty and the project construction cost in the coal underground gasification production process are obviously reduced, and the improvement is brought to the prior art.
In the description of the present invention, the terms "first", "second", "another", and "yet" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A heat exchange device for coal underground gasification technology, its characterized in that, including coolant conveying pipe, heat exchanger, centralizer, instrument tubular column and coolant shower nozzle, the coolant conveying pipe includes inner tube and outer tube, the inner tube is inserted and is located in the outer tube for carry the cryogenic coolant, install at least one check valve in the inner tube, the outer tube is used for carrying the high temperature coolant, heat exchanger install in on the outer tube, the centralizer is fixed in be used for the heat exchange device on the outer wall of outer tube right in the pit with instrument tubular column's is fixed, instrument tubular column locates the outside of outer tube just is fixed in the centralizer, the coolant shower nozzle install in the right-hand member of outer tube.
2. The heat exchange device for an underground coal gasification process according to claim 1, wherein the coolant nozzle comprises a nozzle body, a protective sheath, a spring lock and a pressure-opening nozzle, the nozzle body is connected to the right end of the outer pipe in a sealing manner and is communicated with the inner side of the outer pipe, the protective sheath is arranged on the nozzle body, one end of the spring lock is connected to the right end of the nozzle body, the other end of the spring lock is connected to the inner side of the protective sheath, and the pressure-opening nozzle is arranged between the nozzle body and the protective sheath.
3. The heat exchange device for the underground coal gasification process according to claim 2, wherein the number of the pressure-opening nozzles is 5 to 10, one part is provided at the side of the nozzle body, and the other part is provided at the end of the nozzle body.
4. The heat exchange device for an underground coal gasification process according to claim 3, wherein the nozzle body and the outer pipe are provided as one body.
5. The heat exchange device for an underground coal gasification process according to claim 1, wherein the outer pipe and the inner pipe are connected as an integrated concentric continuous pipe.
6. The heat exchange device for the underground coal gasification process according to claim 5, wherein two check valves are installed in the inner pipe.
7. The heat exchange device for the underground coal gasification process according to claim 5, wherein the left end of the outer pipe is provided with a thread button.
8. The heat exchange device for an underground coal gasification process as claimed in claim 1, wherein the heat exchanger is a fan blade heat exchanger, and is connected to the outer pipe by a screw thread or a slip.
9. The heat exchange apparatus for an underground coal gasification process according to claim 8, wherein the centralizer is a purely rigid centralizer mounted between the fan blade heat exchanger and the coolant spray head.
10. The heat exchange device for the underground coal gasification process according to claim 1, wherein the instrumentation string comprises a distributed temperature sensor, a pressure sensor and an acoustic wave sensor, and is used for controlling production process parameters of the underground coal gasification.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| FR3139380A1 (en) | 2023-08-01 | 2024-03-08 | Cgg Services Sas | SYSTEM AND METHOD FOR ENERGY AND RESOURCE EXTRACTION WITH REDUCED EMISSIONS |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3139380A1 (en) | 2023-08-01 | 2024-03-08 | Cgg Services Sas | SYSTEM AND METHOD FOR ENERGY AND RESOURCE EXTRACTION WITH REDUCED EMISSIONS |
| WO2024126875A1 (en) | 2023-08-01 | 2024-06-20 | Cgg Services Sas | System and method for energy and resource extraction with reduced emissions |
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