CN114396251A - Underground in-situ coal pyrolysis simulation device and method - Google Patents
Underground in-situ coal pyrolysis simulation device and method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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Abstract
The invention belongs to the field of energy exploitation, and particularly relates to a coal underground in-situ pyrolysis simulation device and a method, wherein the device comprises a high-temperature and high-pressure gas supply module, a coal in-situ pyrolysis module, a servo control module and a product regulation and separation module; the high-temperature high-pressure gas supply module is used for providing high-temperature high-pressure steam and inert gas; the coal in-situ pyrolysis module is used for pyrolyzing a coal sample; the servo control module is used for accurately detecting the simulation data in real time and controlling the pyrolysis reaction according to the simulation data; the product regulation and separation module is used for separating pyrolysis products. The method simulates coal pyrolysis in an in-situ link, and provides a theoretical basis and a laboratory simulation basis for underground in-situ pyrolysis of coal.
Description
Technical Field
The invention belongs to the field of energy exploitation, and particularly relates to a coal underground in-situ pyrolysis simulation device and method.
Background
The energy structure of China shows the resource endowment characteristics of 'oil shortage, gas shortage and relative coal richness', in 2020, the proportion of coal in the total primary energy consumption is about 58.3%, the proportion is increased by 0.6%, and in a quite long period of time in the future, the coal still occupies the main position in the energy structure of China. In 2020, the external dependence of oil gas in China respectively reaches 73.5% and 43.2%, low-rank coal resources in China occupy more than half of the total amount of coal resources, and volatile substances in the low-rank coal resources are considerable 'oil gas resources', so that the development of a coal-to-oil and coal-to-natural gas technology taking coal pyrolysis as a core has important significance in realizing domestic independent supply of oil gas.
The current main coal pyrolysis technology is ground pyrolysis, namely, coal is mined and transported underground, washed, selected and processed and then enters ground pyrolysis equipment to be converted into tar, coal gas and semicoke products. But the ground pyrolysis has the problems of large occupied area, excessive pyrolysis semicoke production capacity, ground collapse after mining, atmospheric pollution, water pollution and the like.
Coal underground pyrolysis is a technology that coal is directly pyrolyzed underground through heat transfer of a heat carrier, and an obtained oil gas product is extracted to the ground through a production well to be separated and processed. Compared with the conventional ground pyrolysis technology, the underground in-situ pyrolysis has the characteristics of small occupied area, capability of preventing ground collapse, less carbon emission footprint, low mining cost and the like, and has wide prospect.
The underground coal pyrolysis is pyrolysis under a certain original rock stress condition, and the most important characteristic of in-situ pyrolysis is that deep coal rock bodies usually bear higher axial pressure, confining pressure and pore pressure.
The pressurized thermogravimetric analyzer is often used for researching the weight loss characteristic and the dynamic characteristic of a sample, and is suitable for the pressurized pyrolysis test of mg-g-level coal in small batches. The pressurized wire mesh reactor is mostly used for the fast pyrolysis of small-particle coal samples; the pressurized settling tube reactor is a entrained flow reactor, can provide extremely high heating rate, and is also suitable for single-particle reaction conditions. The pressurized fixed bed reactor is a gas-solid online reaction evaluation system, is used for more coal pyrolysis research, but has a certain difference with the pressure of oil-rich coal in the underground actual environment in the pressurizing process.
The existing high-pressure pyrolysis device is usually used for quickly pyrolyzing small-particle coal and lacks a pyrolysis device for simulating the axial and circumferential pressure of the underground environment. Therefore, the underground in-situ coal pyrolysis simulation device and method have great significance for energy development.
Disclosure of Invention
The invention aims to provide a coal underground in-situ pyrolysis simulation device and method, and aims to solve the technical problems that the existing high-pressure pyrolysis device cannot simulate the underground coal state, the steam injection pyrolysis characteristic of coal under high pressure is not accurately calculated, and the correlation between the product distribution rule and the temperature pressure is not obtained.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to the first aspect, the underground coal in-situ pyrolysis simulation device is characterized by comprising a high-temperature and high-pressure gas supply module, a coal in-situ pyrolysis module, a servo control module and a product regulation and separation module;
the high-temperature high-pressure gas supply module is used for providing a high-temperature high-pressure heat carrier for the coal in-situ pyrolysis module, and the medium is steam, inert gas, reducing gas or low-concentration oxygen-containing gas;
the coal in-situ pyrolysis module is used for pyrolyzing a coal sample by using a high-temperature high-pressure heat carrier provided by the high-temperature high-pressure gas supply module and producing a pyrolysis product;
the servo control module is used for monitoring pyrolysis reaction data in real time and controlling the pyrolysis reaction rate according to the pyrolysis reaction data;
the product regulation and separation module is used for separating pyrolysis products.
The invention is further improved in that: the high-temperature high-pressure gas supply module comprises a steam generator, a gas busbar, a first high-pressure needle valve and a gas heater;
the coal in-situ pyrolysis module comprises a first pipeline heater, a second pipeline heater and a pyrolysis reactor;
the servo control module comprises data sensors, a data acquisition system and an automatic control console, wherein the data sensors comprise a first mass flow meter, a first temperature sensor, a first pressure sensor, a thermocouple temperature sensor, a second mass flow meter, a second temperature sensor, a second pressure sensor and a third mass flow meter;
the product regulation and separation module comprises a catalytic fluidized bed reactor, a condenser, a gas-liquid separator, a tar collecting bottle, a gas separator, a drying pipe, a three-way valve, a gas stove, a gas collecting bottle and a second high-pressure needle valve;
the output port of the steam generator is connected with a first input port of a first mass flow meter, a second input port of the first mass flow meter is connected with an output port of a gas busbar, the output port of the first mass flow meter is connected with a first input port of a gas heater, the output port of the gas heater is connected with the input port of a first pipeline heater through a first stop valve, a first temperature sensor and a first pressure sensor are arranged between the first stop valve and the first pipeline heater, the output port of the first pipeline heater is connected with the input port of a pyrolysis reactor, and the output port of the pyrolysis reactor is connected with the input port of a second pipeline heater through a second stop valve;
the output port of the second pipeline heater is connected with the input port of a second mass flow meter, a second temperature sensor and a second pressure sensor are arranged between the second pipeline heater and the second mass flow meter, the output port of the second mass flow meter is connected with the input port of the catalytic fluidized bed reactor, the output port of the catalytic fluidized bed reactor is connected with the input port of a condenser, the output port of the condenser is connected with the input port of a gas-liquid separator, the liquid output port of the gas-liquid separator is connected with a tar collecting bottle, the gas output port of the gas-liquid separator is connected with the input port of a gas separator, and a first gas outlet of the gas separator is connected with the second input port of the gas heater through a second high-pressure needle valve;
gas separator second gas outlet links to each other with the drying tube input mouth, the drying cylinder delivery outlet links to each other with the third mass flowmeter input port, the third mass flowmeter delivery outlet links to each other with the three-way valve input port, the first delivery outlet of three-way valve links to each other with the gas-cooker, the second delivery outlet of three-way valve links to each other with the gas collecting bottle, first mass flowmeter, first temperature sensor, first pressure sensor, second mass flowmeter, second temperature sensor, second pressure sensor, third mass flowmeter and pyrolytic reaction ware's signal output mouth links to each other with data acquisition system signal input mouth, data acquisition system signal output mouth links to each other with automatic control cabinet signal input mouth, automatic control cabinet signal output mouth links to each other with pyrolytic reaction ware signal input mouth.
The invention is further improved in that: the pyrolysis reactor comprises a hydraulic press, a pressure chamber, a servo valve and a heating electric furnace, wherein the pressure chamber is arranged in the hydraulic press, the electric heating furnace is arranged outside the hydraulic press, and the servo valve is arranged at the top of the hydraulic press;
the hydraulic press comprises a main machine base, a main machine frame, a supporting beam, a hydraulic oil cylinder, a pressure transmission column, a pressure plate, a shaft pressure head, a pyrophyllite powder/salt ring, a confining pressure head and a guide rail;
the pressure chamber comprises a pressure chamber base, a sample carrier, a pressure chamber cylinder, a distributor, a porous guide plate, a thermocouple temperature sensor, a sealing ring and a water cooling sleeve;
the device is characterized in that a host machine frame is arranged above the host machine base, a supporting beam is arranged at the top of the host machine frame, a hydraulic oil cylinder is arranged in the middle of the supporting beam, a servo valve is arranged above the hydraulic oil cylinder, a pressure transmission column is arranged below the hydraulic oil cylinder, a pressure plate is arranged below the pressure transmission column, an axial pressure head is arranged below the pressure plate, confining pressure heads are arranged on two sides of the axial pressure head, a distributor is arranged below the axial pressure head, a guide pipe is arranged above the distributor and is connected with a high-temperature high-pressure air supply module, a plurality of guide pipes are arranged below the distributor and are used as gas outlets, a guide rail is arranged in the host machine frame above the host machine base, a pressure chamber base is arranged above the guide rail and consists of two coaxial cylinders, the diameter of the cylinder below is larger than that of the cylinder above, and a pyrophyllite powder/salt ring and a pressure chamber cylinder body are arranged on the end surface of the cylinder below the pressure chamber base from inside to outside, the pyrophyllite powder/salt ring is a cylinder, a sample carrier is arranged inside the pyrophyllite powder/salt ring, an electric heating furnace is arranged on the outer side of a pressure chamber cylinder, water cooling sleeves are arranged on the upper portion and the lower portion of the electric heating furnace, a porous guide plate is arranged on the end face of an upper cylinder of a pressure chamber base, a guide pipe is arranged below the porous guide plate and used for discharging gas, a thermocouple temperature sensor is arranged above the porous guide plate, and sealing rings are arranged below the porous guide plate and above a distributor.
The invention is further improved in that: and a visual window is arranged on the pressure chamber and used for directly observing the pyrolysis of the internal coal sample on the surface of the pressure chamber.
The invention is further improved in that: the coal sample is obtained by cutting lump coal or by mixing crushed coal, coal powder, red mud, an adhesive and a wetting agent and then compressing and molding the mixture by a briquetting machine;
the adhesive is one or more of hydroxypropyl methylcellulose, sodium carboxymethylcellulose and povidone, and the wetting agent is water or ethanol.
The invention is further improved in that: the maximum pressure of the hydraulic press is 1000KN, and the maximum axial pressure confining pressure is 20 Mpa.
The invention is further improved in that: the rated temperature of the first pipeline heater and the rated temperature of the second pipeline heater are both larger than 360 ℃.
In a second aspect, a method for simulating underground in-situ pyrolysis of coal comprises the following steps:
s1, processing a coal sample into a cylinder, arranging a plurality of holes on the cylinder, and uniformly smearing propping agents on the edges of the holes;
s2, mounting the processed coal sample on a sample carrier, and placing a thermocouple temperature sensor into a hole which is processed in advance by the coal sample; installing a shaft pressing head, and sealing by using a sealing ring;
s3, arranging a pyrophyllite powder/salt ring between the pressure chamber cylinder and the sample carrier, filling a confining pressure loading medium NaCl, compacting in the filling process, filling pyrophyllite powder at a position exceeding a lower pressure head, stopping filling when the pyrophyllite powder/salt ring is filled to a position where the vertical height is higher than the bottom surface of an axial pressure head, and installing a confining pressure head and a heating electric furnace after filling;
s4, connecting the high-temperature high-pressure air supply module pipeline to the outlet of the conduit above the distributor, and connecting the conduit at the bottom of the porous guide plate with the inlet of the product regulation and separation module;
s5, controlling an axial pressure head and a confining pressure head through a servo control module to sequentially and alternately pressurize the coal sample step by step, and finally achieving the preset axial pressure and confining pressure;
s6, opening the first high-pressure needle valve, introducing high-pressure carrier gas in the gas busbar into the pyrolysis reactor, evacuating air in the pyrolysis reactor, preventing the coal sample from being oxidized and combusted in the temperature rising process, closing the second stop valve, and filling a catalyst in the catalytic fluidized bed reactor;
s7, starting an electric heating furnace to heat the coal sample, and directly performing pyrolysis if the coal sample is a small-size sample; if the sample is large-size, opening a first stop valve to inject a high-temperature and high-pressure heat carrier into the coal sample for pyrolysis;
s8, after pyrolysis is completed, opening a first stop valve, opening a first high-pressure needle valve to enable a gas busbar to carry out high-temperature nitrogen purging, enabling pyrolysis gas to enter a catalytic fluidized bed reactor for regulation and control, then collecting liquid tar into a tar collecting bottle sequentially through a condenser and a gas-liquid separator, enabling residual gas products to enter a gas separator, opening a second high-pressure needle valve to enable pyrolysis hydrocarbon gas to flow back for intensified pyrolysis, enabling the residual product gas to enter a gas stove through a three-way valve after passing through a drying pipe and a third mass flow meter, and changing a channel of the three-way valve to enable the gas products to enter the gas collecting bottle when the gas stove can ignite the gas;
and S9, sequentially closing the second stop valve, stopping the condenser, closing the first high-pressure needle valve and the first stop valve, closing the electric heating furnace, closing the water cooling jacket when the temperature is lowered to the detachable temperature, unloading the axial pressure head 29 and the confining pressure head 30 and detaching the rest parts when the axial and confining pressure stresses are lowered to the normal pressure, and preparing for the next test.
The invention is further improved in that: the proppant adding method comprises the following steps:
preparing the mixture into particles, and adding the particles into pore channels of coal samples;
prepared into gel, and is smeared on the outer wall of a pore passage of a coal sample;
the red mud, crushed coal, pulverized coal, sodium carboxymethyl cellulose and water are mixed and then compressed into a coal sample.
The invention is further improved in that: the catalyst in the catalytic fluidized bed reactor is prepared by mixing red mud and deionized water according to the weight ratio of 1: 1.5, treating with acid-base solution, and drying to obtain the final product; the acid solution is one or more of sulfuric acid, hydrochloric acid and nitric acid; the alkaline solution is one or two of sodium hydroxide and ammonia water.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the method simulates coal pyrolysis under the in-situ condition, and provides theoretical basis and laboratory simulation basis for underground in-situ pyrolysis of coal;
2. the hydrocarbon-containing pyrolysis gas is recycled through the second high-pressure needle valve, so that the heating efficiency can be enhanced, the product distribution is improved, and a heat exchange means is realized under the real working condition of laboratory environment simulation.
3. The three adding modes of the proppant in the coal sample can effectively prevent the pore canal from fracturing in the pyrolysis process, protect the pyrolysis process, strengthen the convection heat transfer of steam and improve the heating efficiency.
4. According to the invention, the primary catalytic regulation and control of the proppant are adopted to regulate and control the primary reaction of coal pyrolysis so as to improve the yield of oil gas obtained by coal pyrolysis; through the secondary catalytic regulation and control of the catalytic fluidized bed, the coal pyrolysis secondary reaction is regulated and controlled, and the quality of the obtained tar is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a system block diagram of an underground in-situ pyrolysis simulation device for coal according to the present invention;
FIG. 2 is a schematic structural diagram of a pyrolysis reactor of the underground in-situ pyrolysis simulation device for coal according to the present invention;
FIG. 3 is a system flow chart of the underground in-situ pyrolysis simulation device for coal according to the present invention;
FIG. 4 is a plot of phi 200 x 400mm coal sample boreholes;
FIG. 5 is a schematic diagram of a distributor structure in an underground in-situ pyrolysis simulation device for coal according to the present invention;
FIG. 6 is a schematic view of a porous deflector in the underground in-situ pyrolysis simulation device for coal according to the present invention;
FIG. 7 is a schematic diagram of the position of a visualization window in the underground in-situ pyrolysis simulation device for coal according to the present invention;
FIG. 8 is a schematic structural diagram of an upper-inlet and upper-outlet type pyrolysis reactor in the underground in-situ pyrolysis simulation device for coal.
In the figure, 1, a steam generator; 2. a gas bus; 3. a high pressure needle valve; 4. a mass flow meter; 5. a high pressure needle valve; 6. a gas heater; 7. a stop valve; 8. a temperature sensor; 9. a pressure sensor; 10. a line heater; 20. a pyrolysis reactor; 21. a host base; 22. a host machine frame; 23. a support beam; 24. a hydraulic cylinder; 25. a servo valve; 26. a pressure transfer column; 27. a pressure plate; 28. a pressure chamber base; 29. pressing a pressure head by an axial press; 30. a confining pressure head; 31. a pattern carrier; 32. a pressure chamber cylinder; 33. a distributor; 34. a porous flow guide plate; 35. pyrophyllite powder/salt ring; 36. an electric heating furnace; 37. a water cooling jacket; 38. a seal ring; 39. a guide rail; 40. a thermocouple temperature sensor; 41. a stop valve; 42. a line heater; 43. a temperature sensor; 44. a pressure sensor; 45. a mass flow meter; 46. a catalytic fluidized bed reactor; 47. a condenser; 48. a gas-liquid separator; 49. a tar collecting bottle; 50. a gas separator; 51. a drying tube; 52. a mass flow meter; 53. a three-way valve; 54. a gas range; 55. a gas collection bottle; 61. a data acquisition system; 62. an automation console.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
As shown in fig. 1, a coal underground in-situ pyrolysis simulation device comprises a high-temperature and high-pressure gas supply module, a coal in-situ pyrolysis module, a servo control module and a product regulation and separation module;
the high-temperature high-pressure gas supply module comprises a steam generator 1, a gas busbar 2, a first high-pressure needle valve 3 and a gas heater 6;
the coal in-situ pyrolysis module comprises a first pipeline heater 10, a second pipeline heater 42 and a pyrolysis reactor 20;
the servo control module comprises a data sensor, a data acquisition system 61 and an automatic control console 62, the data sensor comprises a first mass flow meter 4, a first temperature sensor 8, a first pressure sensor 9, a thermocouple temperature sensor 40, a second mass flow meter 45, a second temperature sensor 43, a second pressure sensor 44 and a third mass flow meter 52, the data acquisition system 61 can accurately monitor each test data in real time, and the automatic control console 62 can realize automatic loading and unloading according to set data through a program;
the product regulation and separation module comprises a catalytic fluidized bed reactor 46, a condenser 47, a gas-liquid separator 48, a tar collecting bottle 49, a gas separator 50, a drying pipe 51, a three-way valve 53, a gas stove 54, a gas collecting bottle 55 and a second high-pressure needle valve 5;
as shown in fig. 3, an output port of the steam generator 1 is connected with a first input port of a first mass flow meter 4, a second input port of the first mass flow meter 4 is connected with an output port of the gas busbar 2, an output port of the first mass flow meter 4 is connected with a first input port of a gas heater 6, an output port of the gas heater 6 is connected with an input port of a first pipeline heater 10 through a first stop valve 7, a first temperature sensor 8 and a first pressure sensor 9 are arranged between the first stop valve 7 and the first pipeline heater, an output port of the first pipeline heater 10 is connected with an input port of a pyrolysis reactor 20, an output port of the pyrolysis reactor 20 is connected with an input port of a second pipeline heater 42 through a second stop valve 41, an output port of the second pipeline heater 42 is connected with an input port of a second mass flow meter 45, a second temperature sensor 43 and a second pressure sensor 44 are arranged between the second pipeline heater 42 and the second mass flow meter 45, the output port of the second mass flow meter 45 is connected with the input port of the catalytic fluidized bed reactor 46, the output port of the catalytic fluidized bed reactor 46 is connected with the input port of a condenser 47, the output port of the condenser 47 is connected with the input port of a gas-liquid separator 48, the liquid output port of the gas-liquid separator 48 is connected with a tar collecting bottle 49, the gas output port of the gas-liquid separator 48 is connected with the input port of a gas separator 50, the first gas outlet of the gas separator 50 is connected with the second input port of a gas heater 6 through a second high-pressure needle valve 5, the second gas outlet of the gas separator 50 is connected with the input port of a drying pipe 51, the output port of a drying tank 51 is connected with the input port of a third mass flow meter 52, the output port of the third mass flow meter 52 is connected with the input port of a three-way valve 53, the first output port of the three-way valve 53 is connected with a gas stove 54, the second output port of the three-way valve 53 is connected with a gas collecting bottle 55, the first mass flow meter 5, the second mass flow meter 5, The signal output ports of the first temperature sensor 8, the first pressure sensor 9, the second mass flow meter 45, the second temperature sensor 43, the second pressure sensor 44, the third mass flow meter 52 and the pyrolysis reactor 20 are connected with the signal input port of the data acquisition system 61, the signal output port of the data acquisition system 61 is connected with the signal input port of the automatic console 62, and the signal output port of the automatic console 62 is connected with the signal input port of the pyrolysis reactor 20; the data acquisition system 61 is a distributed control system DCS and the automation console 62 is an automatic control system ACS.
The high-temperature high-pressure gas supply module can provide high-temperature high-pressure steam, inert gas, reducing gas or low-concentration oxygen-containing gas and the like for pyrolyzing and fracturing a sample to generate pores, can provide water vapor with the temperature of 600 ℃ and the pressure of 5MPa and nitrogen with the temperature of 500 ℃ and the pressure of 10MPa and the like, and has the highest gas flow rate of 2L/min;
as shown in fig. 2, the pyrolysis reactor 20 comprises a hydraulic press, a pressure chamber, a servo valve and a heating electric furnace, wherein the pressure chamber is arranged inside the hydraulic press, the electric heating furnace 36 is arranged outside the hydraulic press, and the servo valve 25 is arranged at the top of the hydraulic press;
the hydraulic press comprises a main machine base 21, a main machine frame 22, a supporting beam 23, a hydraulic oil cylinder 24, a pressure transmitting column 26, a pressure plate 27, a shaft pressure head 29, a pyrophyllite powder/salt ring 35, a confining pressure head 30 and a guide rail 39;
the pressure chamber comprises a pressure chamber base 28, a sample carrier 31, a pressure chamber cylinder 32, a distributor 33, a porous guide plate 34, a thermocouple temperature sensor 40, a sealing ring 38 and a water cooling sleeve 38;
the main frame 22 is arranged above the main frame base 21, the supporting beam 23 is arranged on the top of the main frame 22, the hydraulic oil cylinder 24 is arranged in the middle of the supporting beam 23, the servo valve 25 is arranged above the hydraulic oil cylinder 24, the pressure transmission column 26 is arranged below the hydraulic oil cylinder 24, the pressure plate 27 is arranged below the pressure transmission column 26, the axial pressure head 29 is arranged below the pressure plate 27, the confining pressure heads 30 are arranged on two sides of the axial pressure head 29, the distributor 33 is arranged below the axial pressure head 29, the guide pipe is arranged above the distributor 33 and connected with the high-temperature high-pressure air supply module, the plurality of guide pipes are arranged below the high-temperature high-pressure air supply module and used as air outlets, the guide rail 39 is arranged in the main frame 22 above the main frame base 21, the pressure chamber base 28 is arranged above the guide rail 39, the pressure chamber base 28 is composed of two coaxial cylinders, the diameter of the cylinder below is larger than that of the cylinder above, the pyrophyllite powder/salt ring 35 and the pressure chamber cylinder 32 are arranged on the end surface of the cylinder below the pressure chamber base 28 from inside to outside, the pyrophyllite powder/salt ring 35 is a cylinder, a sample carrier 31 is arranged inside the pyrophyllite powder/salt ring, an electric heating furnace 36 is arranged on the outer side of a cylinder body of the pressure chamber, water cooling sleeves 37 are arranged on the upper portion and the lower portion of the electric heating furnace 36, a porous guide plate 34 is arranged on the end face of the upper cylinder body of the base 28 of the pressure chamber, a guide pipe is arranged below the porous guide plate 34 and used for discharging gas, a thermocouple temperature sensor 40 is arranged above the porous guide plate 34, and sealing rings 38 are arranged below the porous guide plate 34 and above the distributor 33.
When the conduit above the distributor 33 is used as a gas inlet, the conduit below the porous baffle 34 is used for discharging gas;
the conduit above the sparger 33 is used to vent gas while the conduit below the porous baffle 34 serves as a gas inlet.
As shown in fig. 5, the upper part of the distributor 33 is in a round cake shape, a round hole is formed in the top of the round cake, a plurality of vertical hollow cylinders are arranged below the round cake, a plurality of round holes are formed in the surfaces of the plurality of hollow cylinders, and a static mixer is arranged inside the plurality of hollow cylinders.
As shown in fig. 6, the porous baffle 34 is shaped like a round cake, and the upper and lower round surfaces are provided with a plurality of round holes.
The pyrolysis reactor 21 can perform steam injection pyrolysis and direct heating pyrolysis on the small-size coal briquette phi 50 x 100mm, study pyrolysis characteristics, perform injection heat carrier pyrolysis on the large-size coal briquette phi 200 x 400mm, simulate convection heating in an underground pipeline, and explore a temperature distribution rule and a product distribution rule in a pyrolysis process.
The automation console 62 comprises a 16-channel data acquisition instrument and is used for accurately detecting temperature, pressure and flow parameters in the acquisition test process; displaying temperature, pressure and flow parameters measured by a sensor in the test process in real time, generating data, and generating a pressure loading rate curve, a temperature rise curve and a real-time flow curve; the external electric heating furnace 36 performs temperature programming, and the temperature raising speed of different stages can be controlled by setting temperature raising parameters; the control console can accurately control the pressure loading of the test process when the test is started and the pressure relief work of the device when the test is finished.
The sample carrier 31 has different specifications of phi 200 × 400mm, phi 50 × 100mm and the like, and is used in combination with the sample, steam injection of the phi 50 × 100mm sample directly enters from a top gas channel, and flows out from the bottom after pyrolysis is finished; a sample carrier of 200 x 400mm phi is required with a distributor 33.
As shown in fig. 5, the distributor 33 further includes four inlet pipes with a length of phi 15 x 250mm, each inlet pipe is provided with a plurality of phi 3mm outlet holes, and the inlet pipe is internally provided with a static mixer with phi 10 x 240 to play a role in heat exchange enhancement.
And a 50 mm-20 mm window is also arranged in the middle of the pressure chamber, and the pyrolysis of the internal coal sample can be directly observed on the surface of the pressure chamber.
For a phi 50 x 100mm sample, a thermocouple temperature sensor 40 is inserted into the center of the sample from the bottom, and the temperature change at the center is detected; for the phi 200 × 400mm sample, the thermocouple temperature sensors 40 were four in total, one at a height of 200mm from the center, one at a height of 150mm at a distance of 30mm from the center, one at a height of 100mm at a distance of 60mm from the center, and one at a height of 50mm at a distance of 85mm from the center, and temperature distribution during pyrolysis was detected in the lateral and longitudinal directions, respectively.
The first pipe heater 10 and the second pipe heater 42 both have heating temperatures greater than 360 ℃, so that pyrolysis volatile components are prevented from being condensed in the pipeline to block the pipeline.
By adopting a 1000KN hydraulic press, the maximum axial pressure confining pressure can reach 20Mpa, the maximum heating electric furnace can reach 700 ℃, and the coal bed pyrolysis in a geological environment with about 1000m of buried depth can be simulated.
The pyrolysis reactor is of an integral structure, the pressure chamber can reciprocate on the guide pipe 39, and the pressure chamber cylinder 32 is lifted by controlling the lifting device, so that samples can be conveniently filled.
The sealing ring 38 of the pressure chamber is made of graphite packing materials, and the sealing material can bear high temperature, is firm and durable, is waterproof and antirust, and has good flexibility.
The pressure chamber comprises a visual window, a coal sample is used for replacing part of confining pressure medium, and the pyrolysis process of the coal sample inside the pressure chamber can be directly observed on the surface of the pressure chamber.
As shown in fig. 7, two installation methods of the visualization window are provided, a circle of window can be formed on the wall of the pressure chamber, rectangular windows with different sizes can be formed on the wall of the pressure chamber, and a sapphire glass window is installed on the wall of the pressure chamber. For a sample of 50 x 100mm, a circle of windows with the height of 20mm is formed in the wall of the pressure chamber, the windows are made of sapphire glass, and the pyrophyllite powder/salt ring 35 is replaced by the sapphire glass; for a sample phi 200 x 400mm, a 50 x 80mm sapphire glass window is formed in the cylinder wall of the pressure chamber, the pyrophyllite powder/salt ring 35 is replaced by a coal sample, and the window can be arranged at the upper, middle and lower parts of the cylinder wall of the pressure chamber.
The multifunctional propping agent with the catalysis function and the heat conduction function is added into the sample, so that the sample is not crushed in the pyrolysis process, the steam convection heating is enhanced simultaneously, and the coal sample pyrolysis is regulated and controlled through the catalysis effect.
Crushing, drying and grinding the red mud into 150 meshes, adding an adhesive, a peptizing agent, an extrusion assistant, a pore-expanding agent and water, and mixing according to the weight ratio of 5: 2: 0.5: 0.25: 0.25: 2, mixing uniformly, and drying for use. The adhesive is one or more of cellulose, starch and phenolic resin; the peptizing agent is one or two of organic acids such as acetic acid, formic acid and the like; sesbania powder is used as the extrusion aid; mesitylene is used as the pore-enlarging agent.
The proppant has three adding modes; (1) preparing into granules, and adding into the air inlet duct; (2) prepared into gel, and is smeared on the outer wall of the pore channel; (3) the red mud is mixed with crushed coal, pulverized coal, sodium carboxymethyl cellulose and water and then compressed into lump coal for use.
The thermocouple temperature sensor 40 is used for detecting the temperature change inside the coal sample in real time on the transverse gradient and the longitudinal gradient, and can draw an internal temperature distribution diagram in the coal sample pyrolysis process.
The bottom of the pressure chamber is provided with a porous diversion trench 34 for facilitating the outflow of volatile components and preventing the volatile components from being blocked in the pressure chamber and pipelines.
The catalytic fluidized bed reactor 46 is a regulation reactor, and a catalyst is placed in the middle of the catalytic fluidized bed reactor 46 to perform catalytic regulation for secondary reaction of pyrolysis volatile components.
The catalyst in the catalytic fluidized bed reactor 46 is prepared from red mud and deionized water in a ratio of 1: 1.5, mixing, respectively modulating by acid and alkali, and drying to obtain the final product; the acid solution is one or more of sulfuric acid, hydrochloric acid and nitric acid; the alkaline solution is one or two of sodium hydroxide and ammonia water.
To the easy condensation of pyrolysis volatile component and block up the pipeline problem, set up first pipeline heater 10 and second pipeline heater 42 at pyrolysis reactor 2 export and entrance, the heating temperature of the two is greater than 360 ℃, is higher than the condensation temperature of tar, can prevent effectively that the condensation of pyrolysis volatile component from blockking up the pipeline in the pipeline.
The first pressure sensor 9 and the second pressure sensor 44 are liquid pressure sensors, and the automation console 62 controls the pressure in the pressure chamber in the pyrolysis reactor 20 to be consistent with a preset pressure according to signals fed back by the first pressure sensor 9 and the second pressure sensor 44, so as to form a pressure closed-loop control of the shaft confining pressure system.
Example 2
A coal underground in-situ pyrolysis simulation method comprises the following steps:
s1, processing a coal sample into a cylinder, arranging a plurality of holes on the cylinder as shown in figures 4-5, and uniformly smearing propping agents on the edges of the holes;
s2, mounting the processed coal sample on the sample carrier 31, and placing the thermocouple temperature sensor 40 into a hole which is processed in advance by the coal sample; mounting the axial pressure head 29 and sealing by using a sealing ring 38;
s3, arranging a pyrophyllite powder/salt ring 35 between the pressure chamber cylinder 32 and the sample carrier 31, filling a confining pressure loading medium NaCl, compacting in the filling process, filling pyrophyllite powder at a position exceeding a lower pressure head, stopping filling when the pyrophyllite powder/salt ring 35 is filled to a position with a vertical height higher than the bottom surface of the axial pressure head 39, and installing the confining pressure head 30 and the electric heating furnace 36 after filling;
s4, connecting the high-temperature high-pressure air supply module pipeline to the outlet of the conduit above the distributor 33, and connecting the conduit at the bottom of the porous guide plate 34 with the inlet of the product regulation and separation module;
s5, controlling the axial pressure head 29 and the confining pressure head 30 to alternately pressurize the coal sample step by step through the servo control module, and finally achieving the preset axial pressure and confining pressure;
s6, opening the first high-pressure needle valve 7, introducing high-pressure nitrogen in the gas busbar 2 into the pyrolysis reactor 20, evacuating air in the pyrolysis reactor 20 to prevent the coal sample from being oxidized and combusted in the temperature rising process, closing the second stop valve 41, and filling a catalyst in the catalytic fluidized bed reactor 46;
s7, starting the electric heating furnace 36 to heat the coal sample, and directly performing pyrolysis if the coal sample is a small-size sample; if the sample is large-size, the first stop valve 7 is opened, and a high-temperature and high-pressure heat carrier is injected into the coal sample for pyrolysis;
s8, after pyrolysis is completed, opening a first stop valve 41, opening a first high-pressure needle valve 2 to enable a gas busbar 2 to carry out high-temperature nitrogen purging, enabling pyrolysis gas to enter a catalytic fluidized bed reactor 46 for regulation, collecting liquid tar into a tar collecting bottle 49 sequentially through a condenser 47 and a gas-liquid separator 48, enabling residual gas products to enter a gas separator 50, opening a second high-pressure needle valve 5 to carry out backflow strengthening pyrolysis on pyrolysis hydrocarbon gas, enabling the residual product gas to enter a gas stove 54 through a three-way valve 53 after passing through a drying pipe 51 and a third mass flow meter 52, and changing the passage of the three-way valve 53 to enable the gas products to enter a gas collecting bottle 55 when the gas stove 54 can ignite the gas;
and S9, sequentially closing the second stop valve 41, stopping the operation of the condenser 47, closing the first high-pressure needle valve 3 and the first stop valve 7, closing the electric heating furnace 36, closing the water cooling jacket 37 when the temperature is lowered to a detachable temperature, unloading the shaft pressure head 29 and the confining pressure head 30 and detaching the rest parts when the axial stress and the confining pressure stress are reduced to normal pressure, and preparing for the next test.
The coal samples have various specifications with different height-diameter ratios such as phi 200 x 400mm, phi 150 x 200mm and phi 50 x 100mm, and the phi 50 x 100mm sample needs to directly drill a pore channel with the length of 60mm and the diameter of 6mm at the center by using a drilling machine; the phi 200 x 400mm sample was drilled with a drill to obtain 4 channels of 270mm length and 8mm diameter directly at the center and 100mm from the center.
The coal sample can be obtained by cutting lump coal; meanwhile, the binder can also be obtained by mixing crushed coal, pulverized coal, red mud, a binder and a wetting agent and then performing compression molding by a briquetting machine, wherein the binder is one or more of hydroxypropyl methylcellulose (HPMC), sodium carboxymethylcellulose (CMC-Na) and povidone (PVP), and the wetting agent is water and ethanol.
Example 3
As shown in fig. 4-5, taking a coal sample of phi 50 x 100mm as an example, the underground pyrolysis at a burial depth of 500mm is simulated, the lateral pressure coefficient is 1.2, the temperature is 600 ℃, and the test steps are as follows:
a pore canal with the length of 60mm and the diameter of 6mm is arranged at the center of the coal sample; a positioning hole with the diameter of 5mm and the length of 5mm is processed at the center of the lower end face of the coal sample.
The coal sample is arranged in the sample carrier 31 through positioning of the positioning holes, and then the sample carrier 31 is arranged on the pressure chamber base 28; simultaneously positioning a thermocouple temperature sensor 40 into a hole of the coal sample; installing the axial pressure head 29 and the confining pressure head 30, sealing by using a sealing ring 38, and then installing the pressure chamber cylinder 32;
a pyrophyllite powder/salt ring 35 is arranged between the pressure chamber cylinder 32 and the sample carrier 31, a confining pressure loading medium NaCl is filled, compaction is carried out in the filling process, pyrophyllite powder is filled at a position exceeding a lower pressure head, filling is stopped when the pyrophyllite powder/salt ring 35 is filled to a position where the vertical height is higher than the bottom surface of an axial pressure head 39, and the confining pressure head 30 and the electric heating furnace 36 are installed after filling is finished;
connecting a pipeline of the high-temperature and high-pressure gas supply module to a conduit outlet above the distributor 33, and connecting a conduit at the bottom of the porous guide plate 34 with an inlet of the product regulation and separation module;
the shaft pressure head 29 and the confining pressure head 30 are controlled by the servo control module to alternately pressurize the coal sample step by step in sequence, the shaft pressure is initially set to be 10MPa, the confining pressure is set to be 12MPa, and the preset axial pressure and confining pressure are finally reached;
opening the first high-pressure needle valve 7, introducing 3MPa nitrogen in the gas busbar 2 into the pyrolysis reactor 20 at a flow rate of 500mL/min, closing the gas busbar 2 when the flow rates of the second mass flow meter 45 and the third mass flow meter 54 are the same as that of the first mass flow meter, closing the first high-pressure needle valve 7 and the second stop valve 41, evacuating air in the pyrolysis reactor 20, preventing the coal sample from being oxidized and combusted in the temperature rising process, closing the second stop valve 41, and filling a catalyst in the catalytic fluidized bed reactor 46;
starting a steam generator 1, wherein the equivalent of cold water is 10mL/min, when the steam temperature is 600 ℃, the steam pressure is 3Mpa, starting a first stop valve 7, and injecting high-temperature and high-pressure steam into a coal sample for pyrolysis; meanwhile, the electric heating furnace 36 is started, the temperature rise rate is set to be 600 ℃, the temperature rise rate is 10 ℃/min, and the temperature rise is synchronous.
Opening a second stop valve 41 after 3 hours, setting the heating temperature of a first pipeline heater 10 and a second pipeline heater 42 to 400 ℃, opening a first high-pressure needle valve 2 to perform high-temperature nitrogen purging on a gas busbar 2, enabling pyrolysis gas to enter a catalytic fluidized bed reactor 46 for regulation, then sequentially collecting liquid tar into a tar collecting bottle 49 through a condenser 47 and a gas-liquid separator 48, enabling residual gas products to enter a gas separator 50, opening a second high-pressure needle valve 5 to enable pyrolysis hydrocarbon gas to flow back for intensified pyrolysis, enabling the residual product gas to pass through a drying pipe 51 and a third mass flow meter 52 and then enter a gas stove 54 through a three-way valve 53, changing the channel of the three-way valve 53 when the gas stove 54 can ignite the gas, enabling the gas products to enter a gas collecting bottle 55, and changing the channel of the three-way valve 53 when the flow rates of the first mass flow meter 4 and the third mass flow meter 52 are the same, the product gas enters the gas stove 54, when the gas stove 54 can not be ignited, the product is ensured to be completely collected, and the test is finished;
and closing the second stop valve 41, stopping the operation of the condenser 47, closing the first high-pressure needle valve 3 and the first stop valve 7, closing the electric heating furnace 36, closing the water cooling jacket 37 when the temperature is lowered to the detachable temperature, unloading the axial pressure head 29 and the confining pressure head 30 and detaching the rest components when the axial stress and the confining pressure stress are lowered to the normal pressure, and preparing for the next test.
Example 4
As shown in fig. 8, the structure of the reactor is the same as that of the pyrolysis reactor 20 in example 1, except that two conduits are arranged above the distributor 33, and no conduit is arranged below the porous flow guider 37, and in this example, either one of the two conduits above the distributor 33 can be used as an air inlet, and the other one can be used as an air outlet.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A coal underground in-situ pyrolysis simulation device is characterized by comprising a high-temperature high-pressure gas supply module, a coal in-situ pyrolysis module, a servo control module and a product regulation and separation module;
the high-temperature high-pressure gas supply module is used for providing a high-temperature high-pressure heat carrier for the coal in-situ pyrolysis module, and the medium is steam, inert gas, reducing gas or low-concentration oxygen-containing gas;
the coal in-situ pyrolysis module is used for pyrolyzing a coal sample by using a high-temperature high-pressure heat carrier provided by the high-temperature high-pressure gas supply module and producing a pyrolysis product;
the servo control module is used for monitoring pyrolysis reaction data in real time and controlling the pyrolysis reaction rate according to the pyrolysis reaction data;
the product regulation and separation module is used for separating pyrolysis products.
2. The underground in-situ coal pyrolysis simulation device according to claim 1, wherein the high-temperature and high-pressure gas supply module comprises a steam generator (1), a gas bus bar (2), a first high-pressure needle valve (3) and a gas heater (6);
the coal in-situ pyrolysis module comprises a first pipeline heater (10), a second pipeline heater (42) and a pyrolysis reactor (20);
the servo control module comprises data sensors, a data acquisition system (61) and an automatic control console (62), the data sensors comprise a first mass flow meter (4), a first temperature sensor (8), a first pressure sensor (9), a thermocouple temperature sensor (40), a second mass flow meter (45), a second temperature sensor (43), a second pressure sensor (44) and a third mass flow meter (52), the data acquisition system (61) is used for acquiring monitoring data of the sensors in real time, and the automatic control console (62) is used for acquiring the monitoring data of the sensors according to the data acquisition system (61) and controlling the coal sample pyrolysis and product separation processes;
the product regulation and separation module comprises a catalytic fluidized bed reactor (46), a condenser (47), a gas-liquid separator (48), a tar collecting bottle (49), a gas separator (50), a drying pipe (51), a three-way valve (53), a gas stove (54), a gas collecting bottle (55) and a second high-pressure needle valve (5);
the output port of the steam generator (1) is connected with a first input port of a first mass flow meter (4), a second input port of the first mass flow meter (4) is connected with an output port of the gas busbar (2), an output port of the first mass flow meter (4) is connected with a first input port of a gas heater (6), an output port of the gas heater (6) is connected with an input port of a first pipeline heater (10) through a first stop valve (7), a first temperature sensor (8) and a first pressure sensor (9) are arranged between the first stop valve (7) and the first pipeline heater, an output port of the first pipeline heater (10) is connected with an input port of a pyrolysis reactor (20), and an output port of the pyrolysis reactor (20) is connected with an input port of a second pipeline heater (42) through a second stop valve (41);
the output port of the second pipeline heater (42) is connected with the input port of a second mass flow meter (45), a second temperature sensor (43) and a second pressure sensor (44) are arranged between the second pipeline heater (42) and the second mass flowmeter (45), the output port of the second mass flow meter (45) is connected with the input port of the catalytic fluidized bed reactor (46), the output port of the catalytic fluidized bed reactor (46) is connected with the input port of a condenser (47), the output port of the condenser (47) is connected with the input port of the gas-liquid separator (48), the liquid outlet of the gas-liquid separator (48) is connected with a tar collecting bottle (49), the gas outlet of the gas-liquid separator (48) is connected with the inlet of the gas separator (50), a first air outlet of the gas separator (50) is connected with a second input port of the gas heater (6) through a second high-pressure needle valve (5);
the second gas outlet of the gas separator (50) is connected with the input port of the drying pipe (51), the output port of the drying tank (51) is connected with the input port of the third mass flow meter (52), the output port of the third mass flow meter (52) is connected with the input port of the three-way valve (53), the first output port of the three-way valve (53) is connected with the gas stove (54), the second output port of the three-way valve (53) is connected with the gas collecting bottle (55), the signal output ports of the first mass flow meter (5), the first temperature sensor (8), the first pressure sensor (9), the second mass flow meter (45), the second temperature sensor (43), the second pressure sensor (44), the third mass flow meter (52) and the pyrolysis reactor (20) are connected with the signal input port of the data acquisition system (61), and the signal output port of the data acquisition system (61) is connected with the signal input port of the automatic control console (62), and the signal output port of the automatic control console (62) is connected with the signal input port of the pyrolysis reactor (20).
3. The underground in-situ coal pyrolysis simulation device according to claim 2, wherein the pyrolysis reactor (20) comprises a hydraulic machine, a pressure chamber, a servo valve and a heating electric furnace, the pressure chamber is arranged inside the hydraulic machine, the electric heating furnace (36) is arranged outside the hydraulic machine, and the servo valve (25) is arranged at the top of the hydraulic machine;
the hydraulic machine comprises a main machine base (21), a main machine frame (22), a supporting beam (23), a hydraulic oil cylinder (24), a pressure transmission column (26), a pressure plate (27), a shaft pressure head (29), a pyrophyllite powder/salt ring (35), a confining pressure head (30) and a guide rail (39);
the pressure chamber comprises a pressure chamber base (28), a sample carrier (31), a pressure chamber cylinder (32), a distributor (33), a porous guide plate (34), a thermocouple temperature sensor (40), a sealing ring (38) and a water cooling sleeve (38);
the device is characterized in that a host machine frame (22) is arranged above the host machine base (21), a supporting beam (23) is arranged at the top of the host machine frame (22), a hydraulic oil cylinder (24) is arranged in the middle of the supporting beam (23), a servo valve (25) is arranged above the hydraulic oil cylinder (24), a pressure transmission column (26) is arranged below the hydraulic oil cylinder (24), a pressure plate (27) is arranged below the pressure transmission column (26), an axial pressure head (29) is arranged below the pressure plate (27), confining pressure heads (30) are arranged on two sides of the axial pressure head (29), a distributor (33) is arranged below the axial pressure head (29), a guide pipe is arranged above the distributor (33), the guide pipe is connected with a high-temperature and high-pressure air supply module, a plurality of guide pipes are arranged below the distributor as an air outlet, a guide rail (39) is arranged in the host machine frame (22) above the host machine base (21), a pressure chamber base (28) is arranged above the guide rail (39), the pressure chamber base (28) is formed by two coaxial cylinders, the diameter of the lower cylinder is larger than that of the upper cylinder, the end surface of the lower cylinder of the pressure chamber base (28) is provided with a pyrophyllite powder/salt ring (35) and a pressure chamber cylinder body (32) from inside to outside, the pyrophyllite powder/salt ring (35) is a cylinder, a sample carrier (31) is arranged inside the pyrophyllite powder/salt ring, an electric heating furnace (36) is arranged on the outer side of the pressure chamber cylinder, water cooling sleeves (37) are arranged on the upper part and the lower part of the electric heating furnace (36), a porous guide plate (34) is arranged on the end surface of the upper cylinder of the pressure chamber base (28), a conduit is arranged below the porous guide plate (34) and used for exhausting gas, a thermocouple temperature sensor (40) is arranged above the porous guide plate (34), sealing rings (38) are arranged below the porous guide plate (34) and above the distributor (33).
4. The underground in-situ coal pyrolysis simulation device according to claim 3, wherein a visualization window is arranged on the pressure chamber and used for directly observing pyrolysis of the internal coal sample on the surface of the pressure chamber.
5. The underground in-situ coal pyrolysis simulation device according to claim 1, wherein the coal sample is obtained by cutting lump coal or by mixing crushed coal, pulverized coal and red mud, an adhesive and a wetting agent and then compressing and molding the mixture by a briquetting machine;
the adhesive is one or more of hydroxypropyl methylcellulose, sodium carboxymethylcellulose and povidone, and the wetting agent is water or ethanol.
6. The underground in-situ coal pyrolysis simulation device of claim 3, wherein the maximum pressure of the hydraulic press is 1000KN, and the maximum axial pressure and confining pressure are 20 MPa.
7. A coal underground in-situ pyrolysis simulation device according to claim 3, characterized in that the rated temperature of the first pipe heater (10) and the rated temperature of the second pipe heater (42) are both greater than 360 ℃.
8. A coal underground in-situ pyrolysis simulation method is characterized by comprising the following steps:
s1, processing a coal sample into a cylinder, arranging a plurality of holes on the cylinder, and uniformly smearing propping agents on the edges of the holes;
s2, mounting the processed coal sample on a sample carrier (31), and placing a thermocouple temperature sensor (40) into a hole of the coal sample processed in advance; mounting an axial pressure head (29) and sealing by using a sealing ring (38);
s3, arranging a pyrophyllite powder/salt ring (35) between the pressure chamber cylinder (32) and the sample carrier (31), filling a confining pressure loading medium NaCl, compacting in the filling process, filling pyrophyllite powder at a position exceeding a lower pressure head, stopping filling when the pyrophyllite powder/salt ring (35) is filled to a position with a vertical height higher than the bottom surface of the axial pressure head (39), and installing a confining pressure head (30) and a heating electric furnace (36) after filling;
s4, connecting a high-temperature high-pressure air supply module pipeline to a conduit outlet above the distributor (33), and connecting a conduit at the bottom of the porous guide plate (34) with an inlet of the product regulation and separation module;
s5, controlling the axial pressure head (29) and the confining pressure head (30) to sequentially and alternately pressurize the coal sample step by step through the servo control module, and finally achieving the preset axial pressure and confining pressure;
s6, opening the first high-pressure needle valve (7), introducing high-pressure carrier gas in the gas busbar (2) into the pyrolysis reactor (20), evacuating air in the pyrolysis reactor (20), preventing a coal sample from being oxidized and combusted in the temperature rising process, closing the second stop valve (41), and filling a catalyst in the catalytic fluidized bed reactor (46);
s7, starting an electric heating furnace (36) to heat the coal sample, and directly performing pyrolysis if the coal sample is a small-size sample; if the sample is large-size, the first stop valve (7) is opened, and a high-temperature and high-pressure heat carrier is injected into the coal sample for pyrolysis;
s8, after pyrolysis is completed, a first stop valve (41) is opened, a first high-pressure needle valve (2) is opened to enable a gas busbar (2) to carry out high-temperature nitrogen purging, pyrolysis gas enters a catalytic fluidized bed reactor (46) to be regulated, then liquid tar is collected into a tar collecting bottle (49) sequentially through a condenser (47) and a gas-liquid separator (48), residual gas products enter a gas separator (50), a second high-pressure needle valve (5) is opened to enable pyrolysis hydrocarbon gas to flow back for intensified pyrolysis, residual product gas passes through a drying pipe (51) and a third mass flowmeter (52) and then enters a gas stove (54) through a three-way valve (53), and when the gas stove (54) can ignite gas, the channel of the three-way valve (53) is changed to enable the gas products to enter the gas collecting bottle (55);
s9, closing the second stop valve (41), stopping the condenser from working (47), closing the first high-pressure needle valve (3) and the first stop valve (7), closing the electric heating furnace (36), closing the water cooling sleeve (37) when the temperature is lowered to the detachable temperature, unloading the shaft pressure head 29 and the confining pressure head 30 and detaching the rest parts when the axial and confining pressure stresses are lowered to the normal pressure, and preparing for the next test.
9. The underground coal in-situ pyrolysis simulation method according to claim 8, wherein the proppant adding method comprises the following steps:
preparing the mixture into particles, and adding the particles into pore channels of coal samples;
prepared into gel, and is smeared on the outer wall of a pore passage of a coal sample;
the red mud, crushed coal, pulverized coal, sodium carboxymethyl cellulose and water are mixed and then compressed into a coal sample.
10. The method for simulating underground in-situ pyrolysis of coal as claimed in claim 8, wherein the catalyst in the catalytic fluidized bed reactor is prepared from red mud and deionized water in a ratio of 1: 1.5, treating with acid-base solution, and drying to obtain the final product; the acid solution is one or more of sulfuric acid, hydrochloric acid and nitric acid; the alkaline solution is one or two of sodium hydroxide and ammonia water.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115236217A (en) * | 2022-06-17 | 2022-10-25 | 北京科技大学 | Device and method for measuring oxidation temperature rise characteristics of triaxial confining pressure coal body |
| CN116626088A (en) * | 2023-03-13 | 2023-08-22 | 陕西省煤田地质集团有限公司 | Deformation characteristic testing device and method for high-temperature pyrolysis of oil-rich coal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115236217A (en) * | 2022-06-17 | 2022-10-25 | 北京科技大学 | Device and method for measuring oxidation temperature rise characteristics of triaxial confining pressure coal body |
| CN116626088A (en) * | 2023-03-13 | 2023-08-22 | 陕西省煤田地质集团有限公司 | Deformation characteristic testing device and method for high-temperature pyrolysis of oil-rich coal |
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