阅读说明：本技术 L型粉末或块状有机岩超临界水氧反应装置及其使用方法 (Supercritical water-oxygen reaction device for L-shaped powder or block organic rock and use method thereof ) 是由 康志勤 王磊 赵静 杨栋 张红鸽 于 2021-08-20 设计创作，主要内容包括：本发明涉及L型粉末或块状有机岩超临界水氧反应装置及其使用方法,属于深部难采非常规或常规资源特殊开采技术领域；技术方案包括L型反应釜、轴向传压杆、注水系统、注氧系统、排水(盐)系统和油气冷凝与收集系统,L型反应釜的釜体中分为超临界水氧反应区,高温油水区以及低温气体区；该反应装置可模拟超临界水与氧协同原位热解不同粒度块状或粉末状有机岩石同时可以实时开采油气的过程和特征,适用于埋深较大的地质环境,能够分段加热,可实现有机岩分区域的超临界水氧热解反应；油气水可以实时高效分离；通过注氧系统向热解后的样品中注入氧气,氧气在水平段流动缓慢,保证与有机岩反应充分,极大降低了爆炸风险。(The invention relates to a supercritical water-oxygen reaction device for L-shaped powder or massive organic rock and a use method thereof, belonging to the technical field of deep difficult-mining unconventional or conventional resource special mining; the technical scheme includes that the device comprises an L-shaped reaction kettle, an axial pressure transmission rod, a water injection system, an oxygen injection system, a water (salt) drainage system and an oil gas condensation and collection system, wherein a kettle body of the L-shaped reaction kettle is divided into a supercritical water-oxygen reaction area, a high-temperature oil-water area and a low-temperature gas area; the reaction device can simulate the process and characteristics of supercritical water and oxygen cooperating with in-situ pyrolysis of blocky or powdery organic rocks with different particle sizes and can simultaneously exploit oil gas in real time, is suitable for geological environments with large burial depth, can heat in sections, and can realize the supercritical water-oxygen pyrolysis reaction of organic rocks in different areas; oil, gas and water can be efficiently separated in real time; oxygen is injected into the sample after pyrolysis through the oxygen injection system, and the oxygen flows slowly in the horizontal section, so that the reaction with organic rock is ensured to be sufficient, and the explosion risk is greatly reduced.)

An L-shaped powder or blocky organic rock supercritical water oxygen reaction device is characterized by comprising an L-shaped reaction kettle, an axial pressure transmission rod, a water injection system, an oxygen injection system, a water (salt) drainage system and an oil gas condensation and collection system, the middle part of the long-edge kettle body of the L-shaped reaction kettle is provided with a snap ring, the snap ring is provided with a lower perforated plate, the end part of the long-edge kettle body of the L-shaped reaction kettle is connected with the axial pressure transmission rod through a first flange, an upper porous plate is arranged at one end of the axial pressure transmission rod arranged in the long-edge kettle body of the L-shaped reaction kettle, the area between the upper porous plate and the lower porous plate forms a supercritical water-oxygen reaction area which is filled with pyrolysis samples, the end area of the clamping ring in the long-edge kettle body of the L-shaped reaction kettle, which faces the short-edge kettle body, is a high-temperature oil-water area, and the side of the short-edge kettle body is a low-temperature gas area;

the bottom of the kettle body of the L-shaped reaction kettle in the high-temperature oil-water area is provided with a water (salt) drainage hole and is connected with the water (salt) drainage system, the upper part of the kettle body is provided with a second thermocouple and a pressure sensor, and the water (salt) drainage system comprises a second back pressure valve, a second heat exchanger and a water tank;

the device comprises a low-temperature gas zone, an L-shaped reaction kettle, a gas-water condensation and collection system, a low-temperature gas zone and an oil-water condensation and collection system, wherein a multistage water circulation cooling cavity is arranged on a kettle body of the L-shaped reaction kettle in the low-temperature gas zone, a liquid level meter is arranged at the lower part of the kettle body of the L-shaped reaction kettle in the low-temperature gas zone, a third thermocouple is arranged at the middle upper part of the kettle body, a second flange is arranged at the top end of the kettle body, a safety valve is arranged on the second flange, the oil-water condensation and collection system comprises a gas-water condensation and collection device and an oil-water condensation and collection device, the gas-water condensation and collection device comprises a first back pressure valve, a first heat exchanger and a gas-water separation device, the oil-water condensation and collection device comprises a third back pressure valve, a third heat exchanger and an oil tank, a hole is arranged on the second flange and communicated with the gas-water condensation and collection device, and the oil-water condensation and collection device is arranged at the lower part of the kettle body of the L-shaped reaction kettle in the low-temperature gas zone;

a fourth thermocouple, a fifth thermocouple and a sixth thermocouple are connected to the kettle body of the L-shaped reaction kettle in the supercritical water-oxygen reaction zone, a heating sleeve is sleeved on the kettle body, a hole is drilled in the central shaft position of the axial transmission rod and connected with the first thermocouple, a water inlet cavity is formed in one side of the axial transmission rod and connected with the water injection system, a gas inlet cavity is formed in the other side of the axial transmission rod and connected with the oxygen injection system, and a water circulation cooling cavity is formed in the axial transmission rod; the water injection system comprises a water pump and a first one-way valve and is used for injecting water to the pyrolysis sample through the water inlet cavity when the pyrolysis sample is in water shortage; the oxygen injection system comprises an oxygen cylinder and a second one-way valve and is used for injecting oxygen into the pyrolysis sample through the air inlet cavity after the pyrolysis sample starts to generate oil gas products.

2. The L-shaped powder or block-shaped organic rock supercritical water oxygen reaction device as claimed in claim 1, wherein a snap ring is welded in the middle of the long-side kettle body of the L-shaped reaction kettle.

3. The supercritical water-oxygen reaction apparatus for L-shaped powder or massive organic rock according to claim 1, wherein the supercritical water-oxygen reaction zone has a length of 200 mm-500 mm, and is divided into zone I, zone II and zone III for heating in sections, and during pyrolysis, zone I is first used as a pyrolysis zone, and zone II and zone III are used as a preheating zone; after oxygen injection, the I area is used as an oxidation heat release area, the II area is used as a pyrolysis area, and the III area is used as a preheating area; and after pyrolysis in the area II is finished, the area II is used as an oxidation heat release area, and the area III is used as a pyrolysis area.

4. The supercritical water-oxygen reaction apparatus for L-shaped powder or block-shaped organic rock according to claim 1 is characterized in that the pore diameter of the upper porous plate and the pore diameter of the lower porous plate are both smaller than the particle diameter of the pyrolysis sample.

5. The L-shaped powder or blocky organic rock supercritical water-oxygen reaction device as claimed in claim 1, wherein a horizontal pipeline connecting the third back pressure valve with the kettle body of the L-shaped reaction kettle is higher than the bottom end position of the liquid level meter.

6. The use method of the reaction device according to any one of claims 1 to 5, characterized by comprising the following steps:

1. placing a lower porous plate on a clamping ring of the L-shaped reaction kettle, filling a pre-soaked sample in the supercritical water-oxygen reaction area, fixing a first flange, and padding the porous plate on the end of the axial pressure transmission rod so as to apply pressure to the sample;

2. connecting the L-shaped reaction kettle with a drainage (salt) system and an oil-gas condensation and collection system, and setting the pressure of a first back pressure valve, a second back pressure valve and a third back pressure valve and the pressure of a safety valve;

3. arranging a heating sleeve at the periphery of a supercritical reaction zone of the L-shaped reaction kettle, connecting the heating sleeve with a water injection system and an oxygen injection system, introducing circulating water into a water circulation cooling cavity and a multi-stage water circulation cooling cavity, heating the kettle body through the heating sleeve, and setting a heating rate and a final temperature;

4. in the sample heating process, observing whether an oil-gas product is produced at the outlet of the gas-water separation device or not and adjusting whether a water injection system supplies water to the sample or not by the change of a liquid level meter;

5. after pyrolysis is carried out for a period of time, almost finishing the pyrolysis of a sample in a supercritical water-oxygen reaction zone I, closing the heating sleeve, injecting oxygen into the sample through the oxygen injection system, simultaneously monitoring the temperature changes of the first thermocouple, the second thermocouple, the third thermocouple, the fourth thermocouple, the fifth thermocouple and the sixth thermocouple, heating the kettle body through the heating sleeve when the temperature is lower than the final temperature, and stopping heating once the temperature reaches the final temperature;

6. when the gas product can not be extracted from the outlet of the gas-water separation device and the gas-water interface of the liquid level meter has no oil layer, the test is stopped, the valve is opened, and the sewage and the salt are discharged.

Technical Field

The invention belongs to the technical field of deep difficult-mining unconventional or conventional resource special mining, and particularly relates to a supercritical water-oxygen reaction device for L-shaped organic rock and a using method thereof.

Background

China is rich in organic rock (coal, oil shale, etc.) reserves. The national condition of China is that the oil is poor and the gas is little, and the organic rock is pyrolyzed to form an oil gas product, which has important significance for relieving the current situation of oil shortage in China. The resource reserves of different burial depths are different, and for ore beds with shallow burial depths of 500m, the mining can be carried out by well construction or in-situ mining, high-temperature fluid (550 ℃) is directly injected into a heat injection well in the in-situ mining, and after the organic matter is fully pyrolyzed, the fluid product can be discharged and mined from a production well. However, for a deeply buried ore bed, the difficulty of underground mining is very high, and the problem of potential safety hazard is serious, while in-situ mining has very serious heat dissipation because high-temperature fluid is transmitted in a long-distance shaft, and the scheme of injecting normal-pressure or low-pressure high-temperature fluid is not feasible. The supercritical water has the advantages of both liquid and gas, has good mass transfer and heat transfer properties, and is often used as an excellent reaction medium due to the characteristics, the supercritical water is called as the supercritical water when the water is in a high-temperature and high-pressure state with critical points (374.3 ℃ and 22.05 MPa), the rock covering stress on a deep-buried mineral layer is very high, a high-pressure fluid environment is created, the critical temperature (374.3 ℃) is far lower than the fluid temperature (550 ℃) required by pyrolysis of a shallow-buried mineral layer, and the influence of the heat dissipation of a shaft on the effective pyrolysis of the mineral layer is very small, so that the supercritical water in-situ pyrolysis deep-buried mineral layer is a particularly feasible scheme.

Patent in this field has CN 112299546A, CN 112680246A etc. now, but current supercritical water reation kettle all is cylindrical thick wall tubular structure, and the single structure can only carry out the intensification supercritical water reaction of state of soaking to organic rock, and its major defect is as follows:

1. the stress loading can not be carried out on the sample, and the supercritical water pyrolysis reaction under the original rock stress condition can not be realized.

2. Staged heating cannot be achieved.

3. Oil, gas and water are completely mixed and cannot be synchronously separated in real time.

4. After oxygen is input into the reactor, the oxygen rapidly and vertically rises and is mixed with pyrolysis gas generated at the top of the cylindrical reaction reactor to generate explosion risk.

Disclosure of Invention

The invention overcomes the defects of the prior art, provides the L-shaped powder or block-shaped organic rock supercritical water oxygen reaction device and the use method thereof, and solves the problems that the organic rock supercritical water oxygen reaction device cannot be loaded, cannot be heated in a grading manner, is easy to explode and the like at present.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the L-shaped powder or massive organic rock supercritical water-oxygen reaction device comprises an L-shaped reaction kettle, an axial pressure transmission rod, a water injection system, an oxygen injection system, a water (salt) drainage system and an oil-gas condensation and collection system, wherein a clamping ring is arranged in the middle of a long-edge kettle body of the L-shaped reaction kettle, a lower porous plate is arranged on the clamping ring, the end part of the long-edge kettle body of the L-shaped reaction kettle is connected with the axial pressure transmission rod through a first flange, an upper porous plate is arranged at one end, arranged in the long-edge kettle body of the L-shaped reaction kettle, of the axial pressure transmission rod, an area between the upper porous plate and the lower porous plate forms a supercritical water-oxygen reaction area, a pyrolysis sample is filled in the supercritical water-oxygen reaction area, one end area, facing the short-edge kettle body, of the clamping ring in the long-edge kettle body of the L-shaped reaction kettle is a high-temperature oil-water area, and the side of the short-edge kettle body is a low-temperature gas area;

the bottom of the kettle body of the L-shaped reaction kettle in the high-temperature oil-water area is provided with a water (salt) drainage hole and is connected with the water (salt) drainage system, the upper part of the kettle body is provided with a second thermocouple and a pressure sensor, and the water (salt) drainage system comprises a second back pressure valve, a second heat exchanger and a water tank;

the device comprises a low-temperature gas zone, an L-shaped reaction kettle, a gas-water condensation and collection system, a low-temperature gas zone and an oil-water condensation and collection system, wherein a multistage water circulation cooling cavity is arranged on a kettle body of the L-shaped reaction kettle in the low-temperature gas zone, a liquid level meter is arranged at the lower part of the kettle body of the L-shaped reaction kettle in the low-temperature gas zone, a third thermocouple is arranged at the middle upper part of the kettle body, a second flange is arranged at the top end of the kettle body, a safety valve is arranged on the second flange, the oil-water condensation and collection system comprises a gas-water condensation and collection device and an oil-water condensation and collection device, the gas-water condensation and collection device comprises a first back pressure valve, a first heat exchanger and a gas-water separation device, the oil-water condensation and collection device comprises a third back pressure valve, a third heat exchanger and an oil tank, a hole is arranged on the second flange and communicated with the gas-water condensation and collection device, and the oil-water condensation and collection device is arranged at the lower part of the kettle body of the L-shaped reaction kettle in the low-temperature gas zone;

a fourth thermocouple, a fifth thermocouple and a sixth thermocouple are connected to the kettle body of the L-shaped reaction kettle in the supercritical water-oxygen reaction zone, a heating sleeve is sleeved on the kettle body, a hole is drilled in the central shaft position of the axial transmission rod and connected with the first thermocouple, a water inlet cavity is formed in one side of the axial transmission rod and connected with the water injection system, a gas inlet cavity is formed in the other side of the axial transmission rod and connected with the oxygen injection system, and a water circulation cooling cavity is formed in the axial transmission rod; the water injection system comprises a water pump and a first one-way valve and is used for injecting water to the pyrolysis sample through the water inlet cavity when the pyrolysis sample is in water shortage; the oxygen injection system comprises an oxygen cylinder and a second one-way valve and is used for injecting oxygen into the pyrolysis sample through the air inlet cavity after the pyrolysis sample starts to generate oil gas products.

Furthermore, a snap ring is welded in the middle of the long-edge kettle body of the L-shaped reaction kettle.

Furthermore, the length of the supercritical water-oxygen reaction zone is 200 mm-500 mm, and the supercritical water-oxygen reaction zone is divided into a zone I, a zone II and a zone III for heating in sections, wherein in the pyrolysis process, the zone I is firstly used as a pyrolysis zone, and the zone II and the zone III are used as preheating zones; after oxygen injection, the I area is used as an oxidation heat release area, the II area is used as a pyrolysis area, and the III area is used as a preheating area; and after pyrolysis in the area II is finished, the area II is used as an oxidation heat release area, and the area III is used as a pyrolysis area.

Furthermore, the aperture of each of the upper porous plate and the lower porous plate is smaller than the particle size of the pyrolysis sample.

Furthermore, a horizontal pipeline of the third back pressure valve connected with the kettle body of the L-shaped reaction kettle is higher than the bottom end position of the liquid level meter.

Further, the operation steps of the using method of the reaction device are as follows:

1. placing a lower porous plate on a clamping ring of the L-shaped reaction kettle, filling a pre-soaked sample in the supercritical water-oxygen reaction area, fixing a first flange, and padding the porous plate on the end of the axial pressure transmission rod so as to apply pressure to the sample;

2. connecting the L-shaped reaction kettle with a drainage (salt) system and an oil-gas condensation and collection system, and setting the pressure of a first back pressure valve, a second back pressure valve and a third back pressure valve and the pressure of a safety valve;

3. arranging a heating sleeve at the periphery of a supercritical reaction zone of the L-shaped reaction kettle, connecting the heating sleeve with a water injection system and an oxygen injection system, introducing circulating water into a water circulation cooling cavity and a multi-stage water circulation cooling cavity, heating the kettle body through the heating sleeve, and setting a heating rate and a final temperature;

4. in the sample heating process, observing whether an oil-gas product is produced at the outlet of the gas-water separation device or not and adjusting whether a water injection system supplies water to the sample or not by the change of a liquid level meter;

5. after pyrolysis is carried out for a period of time, almost finishing the pyrolysis of a sample in a supercritical water-oxygen reaction zone I, closing the heating sleeve, injecting oxygen into the sample through the oxygen injection system, simultaneously monitoring the temperature changes of the first thermocouple, the second thermocouple, the third thermocouple, the fourth thermocouple, the fifth thermocouple and the sixth thermocouple, heating the kettle body through the heating sleeve when the temperature is lower than the final temperature, and stopping heating once the temperature reaches the final temperature;

6. when the gas product can not be extracted from the outlet of the gas-water separation device and the gas-water interface of the liquid level meter has no oil layer, the test is stopped, the valve is opened, and the sewage and the salt are discharged.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the supercritical water oxygen reaction device of the L-shaped powder or block-shaped organic rock is designed, so that the mechanism and process of supercritical water in-situ pyrolysis of organic rock can be fully researched, the grading reaction of supercritical water can be realized, and the device is used for simulating the process and characteristics of supercritical water and oxygen cooperating with in-situ pyrolysis of block-shaped or powder-shaped organic rock with different particle sizes and simultaneously exploiting oil gas in real time, thereby providing a theoretical basis for field practice.

Has the following advantages:

1. the supercritical reaction zone of the L-shaped reaction kettle is heated in a sectional manner, so that the supercritical water-oxygen pyrolysis reaction of organic rock in different regions can be realized;

2. oil, gas and water can be efficiently separated in real time;

3. oxygen is injected into the sample after pyrolysis through the oxygen injection system, the supercritical water reaction zone is placed horizontally, the oxygen flows slowly in the horizontal section, the reaction with organic rock is guaranteed to be sufficient, and the explosion risk is greatly reduced.

Drawings

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic structural diagram of a supercritical water-oxygen reaction device for organic rock according to the present invention;

FIG. 2 is a schematic view of a partitioned principle structure of the supercritical water-oxygen reaction device for organic rock according to the present invention;

in the figure: 1-a water pump; 2-a first one-way valve; 3-axial pressure transmission rod; 4-a first thermocouple; 5-a second one-way valve; 6-oxygen cylinder; 7-water circulation cooling cavity; 8-a first flange; 9-upper perforated plate; 10-heating jacket; 11-a second thermocouple; 12-a pressure sensor; 13-an L-shaped reaction kettle; 14-a snap ring; 15-lower porous plate; 16-third thermocouple; 17-a safety valve; 18-a first heat exchanger; 19-gas-water separation device; 20-a liquid level meter; 21 — a second flange; 22 — a second heat exchanger; 23-a water tank; 24-a fourth thermocouple; 25-fifth thermocouple; 26-sixth thermocouple; 27-water inlet cavity; 28-an air inlet cavity; 29 — first back pressure valve; 30-second back pressure valve; 31-pyrolyzing the sample; 32-a valve; 33-third back pressure valve; 34-a third heat exchanger; 35-oil sump; 36-multi-stage water circulation cooling cavity; 37-supercritical water oxygen reaction zone; 38-high temperature oil-water zone; 39-low temperature gas zone; 40-gas-water interface; region 41-I; region 42-II; 43-zone III.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.

L type powder or cubic organic rock supercritical water oxygen reaction unit, including L type reation kettle 13, axial pressure transmission pole 3, the water injection system, the oxygen injection system, drainage (salt) system and oil gas condensation and collection system, L type reation kettle 13's long limit cauldron body middle part is equipped with snap ring 14, be equipped with lower perforated plate 15 on the snap ring 14, L type reation kettle 13's long limit cauldron body's tip is connected with axial pressure transmission pole 3 through first flange 8, axial pressure transmission pole 3 is established the one end in L type reation kettle 13's long limit cauldron body and is equipped with upper perforated plate 9, the region between upper perforated plate 9 and lower perforated plate 15 constitutes supercritical water oxygen reaction zone, fill pyrolysis sample 31 in supercritical water oxygen reaction zone, the one end region of snap ring 14 towards the minor face cauldron body in L type reation kettle 13's long limit cauldron body is high temperature profit district, the minor face side is low temperature gas district;

a drain (salt) hole is formed in the bottom of the kettle body of the L-shaped reaction kettle 13 in the high-temperature oil-water area and is connected with a drain (salt) system, a second thermocouple 11 and a pressure sensor 12 are arranged on the upper portion of the kettle body, the drain (salt) system comprises a second back pressure valve 30, a valve 32, a second heat exchanger 22 and a water tank 23, and sewage and salt formed in the pyrolysis process are discharged through the drain (salt) system;

be equipped with multistage water circulative cooling chamber 367 on the cauldron body of the L type reation kettle 13 in low temperature gas district, the cauldron body lower part of the L type reation kettle 13 in low temperature gas district is equipped with level gauge 20, well upper portion is equipped with third thermocouple 16, the top is equipped with second flange 21, be equipped with relief valve 17 on the second flange 21, the bottom end position of this level gauge flushes with high temperature high pressure L type reation kettle 13's corner position, can observe the steam-water interface through level gauge 20, cross when low when steam-water interface, give pyrolysis sample 31 moisturizing through water injection system, when steam-water interface is too high, collect the oil slick on the water surface through profit condensation collection device. The oil gas condensation and collection system comprises a gas-water condensation and collection device and an oil-water condensation and collection device, the gas-water condensation and collection device comprises a first back pressure valve 29, a first heat exchanger 18 and a gas-water separation device 19, the oil-water condensation and collection device comprises a third back pressure valve 33, a third heat exchanger 34 and an oil groove 35, when the fluid pressure in the high-temperature high-pressure L-shaped reaction kettle 13 exceeds the set pressure of the high-temperature-resistant first back pressure valve 29, a high-temperature oil gas product formed by pyrolysis enters the gas-water separation device for gas-water separation after being cooled by the heat exchanger, a hole is formed in the second flange 21 and is communicated with the gas-water condensation and collection device, and the oil-water condensation and collection device is arranged at the lower part of the kettle body of the L-shaped reaction kettle 13 in the low-temperature gas area;

the method comprises the following steps that holes are drilled at equal intervals in a kettle body of an L-shaped reaction kettle 13 of a supercritical water-oxygen reaction area, a fourth thermocouple 24, a fifth thermocouple 25 and a sixth thermocouple 26 are connected and are high-tightness K-type thermocouples for monitoring the temperature of different positions of the reaction area, a heating sleeve 10 is sleeved on the kettle body, a hole is drilled in the position of a central shaft of an axial transmission rod and is connected with a first thermocouple 4, a water inlet cavity 27 is formed in one side of the axial transmission rod and is connected with a water injection system, a gas inlet cavity 28 is formed in the other side of the axial transmission rod and is connected with an oxygen injection system, a water circulation cooling cavity 7 is formed in an axial transmission rod 3, and the axial transmission rod 3 applies pressure to a pyrolysis sample 31 through an upper porous plate 9; the water injection system comprises a water pump 1 and a first one-way valve 2, and is used for injecting water into the pyrolysis sample 31 through the water inlet cavity 27 when the pyrolysis sample 31 is short of water; the oxygen injection system comprises an oxygen cylinder 6 and a second one-way valve 5, and is used for injecting oxygen into the pyrolysis sample 31 through the air inlet cavity 28 after the pyrolysis sample 31 starts to generate oil gas products, so as to perform an exothermic reaction with the pyrolysis carbon residue.

Furthermore, a snap ring 14 is welded in the middle of the long-edge kettle body of the high-temperature high-pressure L-shaped reaction kettle.

Furthermore, the length of the supercritical water-oxygen reaction zone is 200 mm-500 mm, and the supercritical water-oxygen reaction zone is divided into a zone I, a zone II and a zone III for heating in sections, wherein in the pyrolysis process, the zone I is firstly used as a pyrolysis zone, and the zone II and the zone III are used as preheating zones; after oxygen injection, the I area is used as an oxidation heat release area, the II area is used as a pyrolysis area, and the III area is used as a preheating area; and after pyrolysis in the area II is finished, the area II is used as an oxidation heat release area, and the area III is used as a pyrolysis area.

Further, the pore diameters of the upper porous plate 9 and the lower porous plate 15 are smaller than the particle diameter of the pyrolysis sample 31.

Further, a horizontal pipeline of the third back pressure valve 33 connected with the kettle body of the L-shaped reaction kettle 13 is higher than the bottom end position of the liquid level meter 20.

Example 1

When the buried depth of the ore bed is 900m, the heat injection temperature is 400 ℃, and the pyrolysis sample is in a block shape, the reaction device provided by the invention comprises the following specific operation steps:

1. a lower porous plate 15 with the aperture smaller than the sample lumpiness is placed on a clamping ring 14 of a high-temperature high-pressure L-shaped reaction kettle 13, a supercritical water-oxygen reaction area is filled with a pre-soaked massive sample, a high-temperature high-pressure first flange 8 is fixed, and a porous plate 9 is arranged on an end pad of an axial pressure transmission rod 3, so that 23.4MPa pressure is applied to the massive sample;

2. connecting the high-temperature high-pressure L-shaped reaction kettle 13 with a drainage (salt) system and an oil-gas condensation and collection system, setting the pressure of a first backpressure valve 29, a second backpressure valve 30 and a third backpressure valve 33 which are resistant to high temperature to be 23.4MPa, and setting the pressure of a safety valve 17 to be 30 MPa;

3. arranging a heating sleeve 10 at the periphery of a supercritical reaction zone of a high-temperature high-pressure L-shaped reaction kettle 13, connecting with a water injection system and an oxygen injection system, introducing circulating water into a water circulation cooling cavity 7 and a multi-stage water circulation cooling cavity 36, and heating the kettle body by the heating sleeve 10, wherein the heating rate is set to be 10 ℃/min, and the final temperature is set to be 400 ℃;

4. during the sample heating process, the outlet of the gas-water separation device 19 is observed whether the oil-gas product is produced, and the change of the liquid level meter 20 is observed. When the gas-water separation device 19 continuously produces gas products and the liquid level meter 20 has no display of a gas-water interface, water is supplemented into the sample through a water injection system; when the liquid level meter 20 shows that the steam-water interface is higher, stopping injecting, fully utilizing return water in the high-temperature high-pressure L-shaped reaction kettle 13 to supplement water to the sample, collecting oil water through an oil-water condensation collecting device, and enabling the collected oil water to be in an oil groove 35;

5. after a period of time of pyrolysis, I district's sample pyrolysis of supercritical water oxygen reaction zone is almost completed, close heating jacket 10, inject oxygen into the sample through annotating the oxygen system, make oxygen and supercritical water oxygen reaction zone I district's pyrolysis carbon residue take place to react the release heat, thereby as the heat source of II district's sample pyrolysis, monitor first thermocouple 4 simultaneously, second thermocouple 11, third thermocouple 16, fourth thermocouple 24, the temperature variation of fifth thermocouple 25 and sixth thermocouple 26, when the temperature is less than 400 ℃ rethread heating jacket 10 heating kettle body, in case the temperature reaches 400 ℃ just stop heating.

6. When the gas product can not be extracted from the outlet of the gas-water separation device 19 and the gas-water interface of the liquid level meter 20 has no oil layer, the test is stopped, the high-temperature and high-pressure resistant valve 32 is opened, and the sewage and the salt are discharged.

Further, the water injection system and the oxygen injection system cannot work simultaneously, and the temperature of supercritical water is ensured by the aid of the heating sleeve 10 in the initial pyrolysis stage; the heating jacket 10 can then be switched off, the temperature required for pyrolysis being provided by oxygen injection, and the heating being assisted by the heating jacket 10 only if the temperature is less than 400 ℃.

Example 2

When the burial depth of the ore bed is 1200m, the heat injection temperature is 380 ℃, and the pyrolysis sample is powder, the reaction device provided by the invention comprises the following specific operation steps:

1. placing a lower porous plate 15 with the aperture smaller than the granularity of a powder sample on a clamping ring 14 of a high-temperature high-pressure L-shaped reaction kettle 13, filling a pre-soaked powder sample in a supercritical water-oxygen reaction area, fixing a high-temperature high-pressure first flange 8, and padding a porous plate 9 on the end head of an axial pressure transmission rod 3 so as to apply the pressure of 30MPa to the powder sample;

2. connecting the high-temperature high-pressure L-shaped reaction kettle 13 with a drainage (salt) system and an oil-gas condensation and collection system, setting the pressure of a first backpressure valve 29, a second backpressure valve 30 and a third backpressure valve 33 which are resistant to high temperature to be 30MPa, and setting the pressure of a safety valve (17) to be 35 MPa;

3. arranging a heating sleeve 10 at the periphery of a supercritical reaction zone of a high-temperature high-pressure L-shaped reaction kettle 13, connecting with a water injection system and an oxygen injection system, introducing circulating water into a water circulation cooling cavity 7 and a multi-stage water circulation cooling cavity 36, and heating the kettle body by the heating sleeve 10, wherein the heating rate is set to be 15 ℃/min, and the final temperature is set to be 380 ℃;

4. during the sample heating process, the outlet of the gas-water separation device 19 is observed whether the oil-gas product is produced, and the change of the liquid level meter 20 is observed. When the gas-water separation device 19 continuously produces gas products and the liquid level meter 20 has no display of a gas-water interface, water is supplemented into the sample through a water injection system; when the liquid level meter 20 shows that the steam-water interface is high, the injection is stopped, the backwater in the high-temperature high-pressure L-shaped reaction kettle 13 is fully utilized to supplement water to the sample, meanwhile, the oil and water are collected through the oil-water condensation collecting device, and the collected oil and water are in the oil groove 35.

5. After a period of time of pyrolysis, I district's sample pyrolysis of supercritical water oxygen reaction zone is almost completed, close heating jacket 10, inject oxygen in to the sample through annotating the oxygen system, make oxygen and supercritical water oxygen reaction zone I district's pyrolysis carbon residue take place to react the release heat, thereby as the heat source of II district's sample pyrolysis, monitor first thermocouple 4 simultaneously, second thermocouple 11, third thermocouple 16, fourth thermocouple 24, the temperature variation of fifth thermocouple 25 and sixth thermocouple 26, when the temperature is less than 380 ℃ rethread heating jacket 10 heating kettle body, in case the temperature reaches 380 ℃ just stop heating.

6. When the gas product can not be extracted from the outlet of the gas-water separation device 19 and the gas-water interface of the liquid level meter 20 has no oil layer, the test is stopped, the high-temperature and high-pressure resistant valve 32 is opened, and the sewage and the salt are discharged.

Further, the water injection system and the oxygen injection system cannot work simultaneously, and the temperature of supercritical water is ensured by the aid of the heating sleeve 10 in the initial pyrolysis stage; the heating jacket 10 can then be switched off, the temperature required for pyrolysis being provided by oxygen injection, and the heating being assisted by the heating jacket 10 only if the temperature is less than 380 ℃.

The reaction device is suitable for the environment with the ore bed buried depth of more than 882m, and the heat injection temperature is required to be more than 374.3 ℃. In the specific operation, the parameter values of pressure, temperature and the like at each position in the reaction device are adaptively adjusted according to the depth of the mine and the heat injection temperature, wherein the set pressure of the first backpressure valve 29, the second backpressure valve 30 and the third backpressure valve 33 is higher than 22.05 MPa.

While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.