Experimental simulation measurement device for water intrusion on the side wall of gasification chamber during coal gasification

Abstract

The present application relates to an experimental simulation measurement device for water intrusion on the side wall of a gasification chamber during coal gasification. The device of the present application includes a sealing shell, a sample holding chamber, a simulated gasification chamber, a heat-insulating pressure-maintaining sleeve, a water supply device, an observation window, a temperature controller, and a first pressure controller. The present application provides reliable data support for the temperature and pressure control process conditions of coal seams at different depths by simulating the amount of water intrusion on the side wall coal samples of different types of coal under different temperature and pressure conditions, and provides reasonable engineering parameters for the underground coal gasification process, which has positive significance for the implementation of pilot test projects and the commercial development of underground coal gasification.

Description

Technical Field

[0001] The present application relates to the field of underground coal gasification, and in particular to an experimental simulation measurement device for water intrusion on the side wall of a gasification chamber during coal gasification. Background Art

[0002] Water intrusion on the side wall of the gasification chamber during underground coal gasification will seriously affect the gasification speed and the degree of gasification reaction, and also affect the quality and quantity of the gas generated by the reaction in the gasification chamber. If the water intrusion on the side wall coal seam is particularly large, it may even cause the underground coal gasification reaction to fail. Under normal conditions, water intrusion mainly affects the injection speed and amount of water in the gasification agent ratio, and is an important technical indicator for production control and operation of gasification reaction speed and degree of gasification reaction.

[0003] Therefore, there is a need for an experimental simulation and measurement device for water intrusion on the side wall of a gasification chamber during coal gasification that can effectively and accurately simulate the water intrusion process and the amount of water intrusion. Summary of the invention

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of this application.

[0005] In one aspect, the present application provides an experimental simulation measurement device for water intrusion on the side wall of a gasification chamber during coal gasification, comprising:

[0006] Sealed shell;

[0007] a sample accommodating chamber, which is disposed in the sealed shell and is configured to accommodate a coal rock sample to be measured, the sample accommodating chamber having a first water inlet and a first water outlet opposite to the first water inlet, the first water inlet being disposed on the sealed shell;

[0008] a simulated gasification chamber, which is arranged in the sealed shell, the simulated gasification chamber having a second water inlet and a second water outlet opposite to the second water inlet, the second water inlet is in water communication with the first water outlet, and the second water outlet is arranged on the sealed shell;

[0009] A heat-insulating and pressure-maintaining sleeve, which is disposed in the sealing shell, and is configured to surround the sample accommodating cavity and separate the sample accommodating cavity from the simulated gasification cavity;

[0010] a water supply device configured to supply water into the sample holding chamber via the first water inlet;

[0011] an observation window, which is disposed on the sealing shell and is configured to enable viewing of the first water outlet;

[0012] a temperature controller connected to the simulated gasification chamber and configured to control the temperature of the simulated gasification chamber;

[0013] A first pressure controller is connected to the simulated gasification chamber and is configured to control the pressure of the simulated gasification chamber.

[0014] In this application, the term "coal rock sample" mainly refers to (1) coal samples taken from the side wall of the real gasification cavity of the coal seam; (2) one-side coking coal samples fired in the laboratory; and (3) raw coal samples, including natural raw coal samples and artificially made coal samples.

[0015] In the present application, the sealed shell is a shell made of airtight or watertight materials, such as special steel, stainless steel, etc. For example, a sealed shell made of stainless steel can withstand temperatures up to 1200°C, which better solves the temperature and pressure bearing problems of the device.

[0016] In the present application, the dimension of the sealed shell in the first direction is greater than the dimension of the sealed shell in the second direction, and the first direction is perpendicular to the second direction.

[0017] In this application, the first direction generally refers to the length direction of the sealed shell, and the second direction generally refers to the width direction of the sealed shell. The size of the sealed shell in the first direction generally refers to the length, and the size of the sealed shell in the second direction generally refers to the width. Generally, the length dimension is greater than or much greater than the width dimension.

[0018] In the present application, the sealing shell can be in different shapes, such as a long strip shape, including a cylinder, etc. Optionally, the sealing shell is in the shape of a cylinder. In this case, the size of the sealing shell in the first direction generally refers to the axial length of the sealing shell cylinder (i.e., the height of the cylinder), and the size of the sealing shell in the second direction generally refers to the diameter size of the sealing shell cylinder (i.e., the bottom diameter of the cylinder).

[0019] In the present application, the shape of the sample receiving chamber matches the shape of the sealing shell, for example, it may be in the shape of a cylinder.

[0020] The length of the sample holding cavity can be different. If the length of the coal rock sample is smaller than the size of the sample holding cavity, a high permeability alternative rock sample can be placed in the sample holding cavity to adjust the position of the coal rock sample and fill the position when the rock sample length is insufficient. This can be adjusted according to the different conditions of the coal rock sample obtained.

[0021] In the present application, the simulated gasification chamber can simulate different temperature and pressure conditions of the gasification reaction carried out in the actual gasification chamber, so as to subsequently measure different water intrusion amounts and extreme water intrusion amounts under different temperature and pressure conditions.

[0022] The temperature condition in the simulated gasification chamber can be controlled by a temperature controller, including increasing (such as heating) or decreasing the temperature of the simulated gasification chamber by different heating methods through the temperature controller to adjust or maintain the temperature in the simulated gasification chamber.

[0023] The pressure condition in the simulated gasification chamber may be controlled by the first pressure controller, including increasing or decreasing the pressure in the simulated gasification chamber by the first pressure controller to adjust or maintain the pressure in the simulated gasification chamber.

[0024] Optionally, the water supply device can be in the form of a pressure pump to deliver water. Optionally, the pressure pump can also have a heater to deliver and inject water with different injection pressures and injection temperatures into the sample receiving chamber.

[0025] Optionally, the first pressure controller may be in the form of a back pressure pump. The first pressure controller may be used to ensure that the water flows from the first water inlet to the second water outlet under the condition that the injection pressure is greater than the back pressure. The back pressure provided by the back pressure pump may generally be in the range of 1-10 MPa.

[0026] Optionally, the observation window may be transparent, so as to ensure that the water intrusion effect of the first water outlet end surface can be observed from outside the sealing shell, and the limit water intrusion amount can be determined. The observation window may be arranged on the sealing shell.

[0027] Optionally, the size of the heat-insulating pressure-maintaining sleeve is adapted to the size of the sample accommodating chamber. Optionally, the heat-insulating pressure-maintaining sleeve is used to isolate the heat of the sample accommodating chamber and maintain the pressure of the sample accommodating chamber, and limit the flow direction to only the flow direction from the first water inlet to the second water outlet.

[0028] Optionally, the heat-insulating pressure-maintaining sleeve can be made of ceramic material. For example, the heat-insulating pressure-maintaining sleeve adopts silicate ceramics and can withstand temperatures up to 2100° C. The heat-insulating and constant-pressure effects of the upper and lower surrounding rocks in the coal seam are achieved through the pressure-maintaining and heat-resisting effects of the ceramics outside the sample holding cavity.

[0029] Optionally, if the reaction temperature in the simulated gasification chamber is as high as 1400°C or above, a heat insulation layer may be provided on one side of the simulated gasification chamber close to the heat insulation and pressure retaining sleeve to prevent excessive temperature from affecting the heat insulation and pressure retaining function of the heat insulation and pressure retaining sleeve. The heat insulation layer is made of high temperature resistant metal.

[0030] Optionally, in order to further enhance the heat-insulating and pressure-maintaining effect of the heat-insulating and pressure-maintaining sleeve on the sample containing cavity and the effect of limiting the water flow direction, a second pressure controller connected to the heat-insulating and pressure-maintaining sleeve may be provided.

[0031] Optionally, the second pressure controller may be in the form of a casing pressure pump. The second pressure controller is used to generate pressure on the heat-insulating pressure-maintaining casing, so as to further ensure that the coal and rock samples to be measured in the sample holding chamber are in a sealed and heat-insulated state and ensure the flow direction of water. The casing pressure provided by the casing pressure pump can generally be in the range of 1-10 MPa.

[0032] Optionally, the device of the present application further comprises a first pressure sensor, which is arranged between the water supply device and the first water inlet.

[0033] Optionally, the device further comprises a temperature sensor and a second pressure sensor, and both the temperature sensor and the second pressure sensor are connected to the simulated gasification chamber.

[0034] Optionally, the device may further include a first flow meter and a second flow meter, wherein the first flow meter is arranged between the water supply device and the first water inlet, and the second flow meter is arranged on a side of the second water outlet away from the second water inlet.

[0035] The first flow meter is mainly used to measure the water flow rate transmitted by the water supply device through the first water inlet under the injection pressure condition. The second flow meter is mainly used to measure the water flow rate discharged from the second water outlet.

[0036] Optionally, the device further comprises a data collector, and the temperature sensor, the first pressure sensor, the second pressure sensor, the first flow meter and the second flow meter are all connected to the data collector. The temperature data in the simulated gasification chamber measured by the temperature sensor, the water injection pressure data measured by the first pressure sensor, the pressure data in the simulated gasification chamber measured by the second pressure sensor, the water flow data injected into the sample holding chamber measured by the first flow meter, and the water flow data discharged from the second water outlet measured by the second flow meter are all transmitted to the data collector.

[0037] Optionally, the data collector can also be connected to a computer data processing system for data storage and processing.

[0038] Optionally, the device may further include a third pressure sensor for measuring the pressure of the first pressure controller and a fourth pressure sensor for measuring the pressure of the second pressure controller. The pressure data measured by the third pressure sensor and the fourth pressure sensor may also be collected by a data collector and transmitted to a computer data processing system.

[0039] The present application directly connects one end of the coal rock sample to the simulated gasification chamber, thereby ensuring the heat transfer and heat conduction function of the coal rock sample and simulating the physical and chemical reactions in different areas such as the oxidation zone, gasification zone, reduction zone, drying zone and raw coal zone in each layer.

[0040] The device for measuring the water intrusion into the side wall of the gasification chamber during coal gasification in the present application realizes (1) simulating and controlling the temperature and pressure of the simulated gasification chamber; (2) controlling the gasification reaction of the coal sample to take place only on the side of the coal rock in the simulated gasification chamber; (3) simulating and controlling the flow rate of water intrusion into the simulated gasification chamber; and (4) determining the limit water intrusion under different temperature conditions through indoor experiments, thereby providing favorable technical support for water intrusion control and temperature adjustment of underground coal gasification.

[0041] This application is mainly used to simulate the water intrusion of side wall coal samples of different types of coal under different temperature and pressure conditions, so as to provide experimental data support for the water intrusion of coal seams at different depths, thereby providing reliable data support for the temperature and pressure control process conditions of coal seams at different depths, and providing reasonable engineering parameters for underground coal gasification technology, which has positive significance for the implementation of pilot test projects and the commercial development of underground coal gasification.

[0042] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0044] Figure 1 It is a schematic cross-sectional view of an experimental simulation measurement device for water intrusion on the side wall of a gasification chamber during coal gasification according to an exemplary embodiment of the present application.

[0045] Description of reference numerals:

[0046] 1-water supply equipment; 2-first flow meter; 3-first pressure sensor; 4-first water inlet; 5-sealed shell; 6-heat-insulating pressure-maintaining sleeve; 7-sample holding chamber; 8-first water outlet; 8'-second water inlet; 9-temperature sensor; 10-second pressure sensor; 11-simulated vaporization chamber; 12-observation window; 13-second pressure controller; 14-temperature controller; 15-first pressure controller; 16-cooling device; 17-second flow meter; 18-data acquisition device; 19-control valve; 20-second water outlet. DETAILED DESCRIPTION

[0047] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0048] The present application provides an experimental simulation measurement device for water intrusion on the side wall of a gasification chamber during coal gasification. The experimental simulation measurement device of the present application includes: a sealed shell; a sample holding cavity, which is arranged in the sealed shell and configured to hold a coal and rock sample to be measured, the sample holding cavity having a first water inlet and a first water outlet opposite to the first water inlet, and the first water inlet is arranged on the sealed shell; a simulated gasification cavity, which is arranged in the sealed shell, the simulated gasification cavity having a second water inlet and a second water outlet opposite to the second water inlet, the second water inlet is in water communication with the first water outlet, and the second water outlet is arranged on the sealed shell; a heat-insulating pressure-maintaining sleeve, which is arranged in the sealed shell, the heat-insulating pressure-maintaining sleeve is configured to surround the sample holding cavity and separate the sample holding cavity from the simulated gasification cavity; a water supply device, which is configured to supply water to the sample holding cavity via the first water inlet; an observation window, which is arranged on the sealed shell and configured to be able to see the first water outlet; a temperature controller, which is connected to the simulated gasification cavity and configured to control the temperature of the simulated gasification cavity; a first pressure controller, which is connected to the simulated gasification cavity and configured to control the pressure of the simulated gasification cavity.

[0049] Figure 1 2 is a schematic cross-sectional view of an experimental simulation measurement device for water intrusion on the side wall of a gasification chamber during coal gasification according to an exemplary embodiment of the present application. Figure 1 As shown, a sample holding chamber 7 and a simulated gasification chamber 11 are provided in the sealing shell 5. The sealing shell 5 can be made of stainless steel metal. The sample holding chamber 7 is used to place the coal and rock samples to be measured. One end of the sample holding chamber 7 has a first water inlet 4, and the other opposite end has a first water outlet 8. The first water inlet 4 can be provided on the sealing shell 5. One end of the simulated gasification chamber 11 has a second water inlet 8', and the second water inlet 8' can be the same as or integrated with the first water outlet 8, so that the two are water-connected. A second water outlet 20 can be provided at the other end of the simulated gasification chamber 11, and the second water outlet 20 can be provided on the sealing shell 5. A heat-insulating and pressure-maintaining sleeve 6 made of a high-temperature resistant porous ceramic material is also provided in the sealing shell 5. The heat-insulating and pressure-maintaining sleeve 6 is placed around the sample holding chamber 7 and separates the sample holding chamber 7 from the simulated gasification chamber 11.

[0050] Outside the sealing shell 5, a water supply device 1 is provided upstream of the sample holding chamber 7, which can be used to supply water to the sample holding chamber 7 via the first water inlet 4. A first flow meter 2 and a first pressure sensor 3 are provided between the water supply device 1 and the first water inlet 4. The first flow meter 2 is used to measure the injection flow value of the water injected into the sample holding chamber 7. The first pressure sensor 3 can measure the injection pressure of the water injected into the sample holding chamber 7.

[0051] A temperature controller 14 and a first pressure controller 15 connected to the simulated gasification chamber 11 are also provided outside the sealed shell 5. The temperature and pressure of the simulated gasification chamber are controlled by the temperature controller 14 and the first pressure controller 15, thereby simulating different temperature and pressure conditions of the gasification reaction in the gasification chamber during the actual gasification process.

[0052] The simulated gasification chamber 11 is also connected to a temperature sensor 9 and a second pressure sensor 10 to measure the temperature and pressure in the simulated gasification chamber 11 .

[0053] The water discharged from the simulated gasification chamber 11 enters the cooling device 16 for cooling, and then the discharge flow value of the discharged water is measured by the second flow meter 17. Then the data collector 18 collects the injection flow value and the discharge flow value.

[0054] A second pressure controller 13 is provided outside the sealing shell 5 and is connected to the heat-insulating pressure-maintaining sleeve 6 through an opening on the sealing shell. The second pressure controller 13 is used to provide pressure to the heat-insulating pressure-maintaining sleeve 6.

[0055] The experimental simulation measurement device provided in the present application can measure the specific value of water intrusion. The experimental simulation measurement process may include the following steps: a: set the first pressure and the first temperature of the simulated gasification chamber, and keep them constant during the measurement process, and then place the coal rock sample to be measured into the sample holding chamber; b: supply water to the sample holding chamber at an initial flow rate through a water supply device for an initial period of time; c: observe the interface condition of the coal rock sample to be measured at the first water outlet through an observation window, and record the flow rate of injected water, the flow rate of discharged water, time, pressure and temperature changes; d: if the interface condition does not change, increase the amount of water injected; e: repeat steps c and d; f: when water droplets are observed on the end face of the coal rock sample to be measured at the first water outlet, the limit water intrusion under the first temperature and first pressure conditions is obtained; g: change the temperature and pressure in the simulated gasification chamber, repeat steps b to f, and the limit water intrusion of the coal rock sample to be measured under different temperature and pressure conditions is obtained.

[0056] Specifically, by measuring the water intrusion of a coal sample with a diameter of 3.8 cm and a length of 15 cm, the heat-insulating and pressure-maintaining sleeve 6 can be designed to have an inner diameter of 3.8 cm and a thickness of 2.1 cm. The measurement process may include the following steps: (1) using the second pressure controller 13, adjusting the pressure to the experimental design pressure, such as 4 MPa, and keeping the pressure constant during the experiment; (2) using the temperature controller 14 to heat and adjust the temperature of the simulated gasification chamber 11 to the design temperature, such as 600°C, and keeping the temperature in the simulated gasification chamber constant during the experiment; (3) then, turning on the water supply device (such as a pressurized injection pump) starting from a relatively small flow rate of 1 mL / min, and continuously injecting pure water from the injection pump for 5 minutes; (4) observing the interface condition of the coal-rock sample through the observation window 12, and recording the changes in flow rate, time, pressure and temperature; (5) if the interface condition does not change, increasing the injection amount, such as 2 mL / min or 3 mL / min, repeating steps (3) and (4), measuring the water injection flow value through the first flowmeter 2, and measuring the water discharge flow value through the second flowmeter 17, these values ​​are collected by the data acquisition device 18, and these values ​​are transmitted to the data processor, and the water intrusion under the current temperature and pressure conditions can be obtained by subtracting the injection flow value from the discharge flow value.

[0057] The measurement process may also include the following steps: (6) continuing to inject pure water, when water droplets are observed from the observation window 12 at one end of the coal rock sample directly connected to the simulated gasification chamber 11, measuring the discharge flow value and the injection flow value at this time, and subtracting the injection flow value from the discharge flow value to obtain the maximum water intrusion under the temperature and pressure conditions, after which the simulated gasification chamber 11 will be quickly flooded with water; (7) changing the temperature and pressure in the simulated gasification chamber 11, and repeating steps (2)-(6), so as to obtain the maximum water intrusion of the coal rock sample under different temperature and pressure conditions.

[0058] In this application, when the pressure in the gasification chamber is constant, representing the actual depth of the coal seam, the measurement of water intrusion and the maximum water intrusion is carried out step by step under different simulated gasification chamber temperature conditions: the simulated gasification chamber is gradually flooded from low temperature to high temperature, and the maximum water intrusion at different temperatures is determined, and the value of the maximum water intrusion is constantly increasing.

[0059] Although the embodiments disclosed in this application are as above, the contents described are only embodiments adopted to facilitate understanding of this application and are not intended to limit this application. Any technician in the field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of protection of this application shall still be based on the scope defined in the attached claims.

Claims

1. An experimental simulation measurement device for water intrusion on the side wall of a gasification chamber during coal gasification, characterized in that: include: Sealed shell; a sample accommodating chamber, which is disposed in the sealed shell and is configured to accommodate a coal rock sample to be measured, the sample accommodating chamber having a first water inlet and a first water outlet opposite to the first water inlet, the first water inlet being disposed on the sealed shell; a simulated gasification chamber, which is arranged in the sealed shell, the simulated gasification chamber having a second water inlet and a second water outlet opposite to the second water inlet, the second water inlet is in water communication with the first water outlet, and the second water outlet is arranged on the sealed shell; A heat-insulating and pressure-maintaining sleeve, which is disposed in the sealing shell, and is configured to surround the sample accommodating cavity and separate the sample accommodating cavity from the simulated gasification cavity; a water supply device configured to supply water into the sample holding chamber via the first water inlet; an observation window, which is disposed on the sealing shell and is configured to enable viewing of the first water outlet; a temperature controller connected to the simulated gasification chamber and configured to control the temperature of the simulated gasification chamber; A first pressure controller is connected to the simulated gasification chamber and is configured to control the pressure of the simulated gasification chamber.

2. The analog measurement device according to claim 1, characterized in that The device further comprises a second pressure controller connected to the heat-insulating pressure sleeve and configured to pressurize the heat-insulating pressure sleeve.

3. The analog measurement device according to claim 1 or 2, characterized in that: The heat-insulating and pressure-maintaining sleeve is made of ceramic material.

4. The analog measurement device according to claim 1, characterized in that: The apparatus further comprises a first pressure sensor disposed between the water supply device and the first water inlet.

5. The analog measurement device according to claim 4, characterized in that: The device further comprises a temperature sensor and a second pressure sensor, and both the temperature sensor and the second pressure sensor are connected to the simulated gasification chamber.

6. The analog measurement device according to claim 5, characterized in that The device further comprises a first flow meter and a second flow meter, wherein the first flow meter is arranged between the water supply device and the first water inlet, and the second flow meter is arranged on a side of the second water outlet away from the second water inlet.

7. The analog measurement device according to claim 6, characterized in that The device further includes a data collector, and the temperature sensor, the first pressure sensor, the second pressure sensor, the first flow meter, and the second flow meter are all connected to the data collector.

8. The analog measurement device according to claim 1, characterized in that: A heat insulation layer is arranged on one side of the simulated gasification cavity close to the heat insulation and pressure maintaining sleeve.

9. The analog measurement device according to claim 1, characterized in that: The first pressure controller is a back pressure pump.

10. The analog measurement device according to claim 2, characterized in that: The second pressure controller is a casing pressure pump.

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