CN115977608A - Experimental simulation measuring device for water invasion of gasification cavity side wall in coal gasification process - Google Patents
Experimental simulation measuring device for water invasion of gasification cavity side wall in coal gasification process Download PDFInfo
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- CN115977608A CN115977608A CN202211642665.3A CN202211642665A CN115977608A CN 115977608 A CN115977608 A CN 115977608A CN 202211642665 A CN202211642665 A CN 202211642665A CN 115977608 A CN115977608 A CN 115977608A
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Abstract
The application relates to an experimental simulation measuring device for water invasion of a gasification cavity side wall in a coal gasification process. The device of this application holds the chamber, simulation gasification chamber, thermal-insulated pressurize cover, water supply apparatus, observation window, temperature controller and first pressure controller including sealed shell, sample. The method and the device have the advantages that the reliable data support is provided for the temperature and pressure control process conditions of coal beds at different depths by simulating the water invasion amount of the side wall coal samples of different coal types under different temperature and pressure conditions, reasonable engineering parameters are provided for the underground coal gasification process, and the method and the device have positive significance for pilot test engineering implementation and underground coal gasification commercial development.
Description
Technical Field
The application relates to the field of underground coal gasification, in particular to an experimental simulation measuring device for water invasion of a lateral wall of a gasification cavity in a coal gasification process.
Background
The water invasion of the side wall of the gasification cavity in the underground coal gasification process seriously affects the gasification speed and the gasification reaction degree, and also affects the quality and quantity of the gas generated by the reaction of the gasification cavity. If the water invasion amount of the side wall coal seam is extremely large, the underground coal gasification reaction can not be carried out. Under conventional conditions, the water intrusion mainly influences the injection speed and the injection amount of water in the proportioning of the gasifying agent, and is an important technical index for controlling the gasification reaction speed and the gasification reaction degree in production and operation.
Therefore, there is a need for an experimental simulation measuring device for water invasion of the side wall of a gasification chamber in a coal gasification process, which can effectively and accurately simulate the water invasion process and water invasion amount.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the present application.
In one aspect, the application provides an experimental simulation measuring device that gasification chamber lateral wall water invades among coal gasification, includes:
sealing the shell;
a sample receiving chamber disposed within the sealed housing and configured to receive a coal rock sample to be measured, the sample receiving chamber having a first water inlet and a first water outlet opposite the first water inlet, the first water inlet being disposed on the sealed housing;
a simulated gasification chamber disposed within the sealed housing, the simulated gasification chamber having a second water inlet in water communication with the first water outlet and a second water outlet opposite the second water inlet, the second water outlet disposed on the sealed housing;
a thermally and pressure insulating sleeve disposed within the sealed envelope, the thermally and pressure insulating sleeve configured to surround the sample receiving cavity and separate the sample receiving cavity from the simulated gasification cavity;
a water supply device configured to supply water into the sample-accommodating chamber via the first water inlet;
a viewing window disposed on the sealed housing and configured to enable viewing of the first water outlet;
a temperature controller coupled to the simulated gasification chamber and configured to control a temperature of the simulated gasification chamber;
a first pressure controller coupled to the simulated gasification chamber and configured to control a pressure of the simulated gasification chamber.
In the present application, the term "coal rock sample" refers primarily to (1) a coal sample taken from the sidewall of a true gasification chamber of a coal seam; (2) a side coking coal sample fired in a laboratory; and (3) raw coal samples including natural raw coal samples, artificially produced coal samples and the like.
In this application, the sealing shell is a shell made of an airtight or watertight material, such as special steel, stainless steel, or the like. For example, the sealing shell made of stainless steel materials can bear the temperature of 1200 ℃, and the temperature and pressure bearing problem of the device is well solved.
In the present application, the dimension of the sealing can in the first direction is larger than the dimension of the sealing can in the second direction, the first direction being perpendicular to the second direction.
In the present application, the first direction generally refers to a length direction of the sealed envelope, and the second direction generally refers to a width direction of the sealed envelope. The dimension of the capsule in the first direction is usually referred to as the length and the dimension of the capsule in the second direction is usually referred to as the width. Typically, the length dimension is greater or much greater than the width dimension.
In the present application, the sealing shell may be in different shapes, for example in the shape of an elongated bar, including a cylinder, etc. Optionally, the sealing shell is in the shape of a cylinder. At this time, the dimension of the capsule in the first direction generally refers to the axial length of the capsule cylinder (i.e., the height of the cylinder), and the dimension of the capsule in the second direction generally refers to the diameter dimension of the capsule cylinder (i.e., the diameter of the bottom surface of the cylinder).
In the present application, the shape of the sample receiving chamber matches the shape of the sealed housing, and may be, for example, a cylinder.
The length of the sample receiving chamber may be different. If the length of the coal rock sample is smaller than the size of the sample containing cavity, a high-permeability alternative rock sample can be placed in the sample containing cavity to adjust the position of the coal rock sample and the position filling when the length of the rock sample is insufficient, and the adjustment can be performed according to different conditions of the obtained coal rock sample.
In this application, the different temperature and the pressure condition of the gasification reaction that go on in the actual gasification chamber can be simulated to the simulation gasification chamber to different water invasion volume and limit water invasion volume under the different temperature and pressure condition are surveyed in the follow-up.
The temperature conditions within the simulated gasification chamber can be controlled by a temperature controller, including by the temperature controller increasing (e.g., heating) or decreasing the temperature of the simulated gasification chamber in different heating regimes to adjust or maintain the temperature within the simulated gasification chamber.
The pressure conditions within the simulated gasification chamber may be controlled by a first pressure controller, including increasing or decreasing the pressure of the simulated gasification chamber by the first pressure controller to adjust or maintain the pressure within the simulated gasification chamber.
Alternatively, the water supply may take the form of a pressurised pump to deliver water. Alternatively, the pressurizing pump may further have a heater to deliver and inject water having different injection pressures and injection temperatures into the sample-accommodating chamber.
Alternatively, the first pressure controller may take the form of, for example, a back pressure pump. The first pressure controller may be adapted to ensure a flow direction of water from the first water inlet to the second water outlet under a condition that the injection pressure is greater than the back pressure. The back pressure provided by the back pressure pump may typically be in the range of 1-10 MPa.
Optionally, the observation window may be transparent to ensure that the water invasion effect of the end face of the first water outlet can be observed from the outside of the sealed shell, and to judge the limit water invasion amount. The viewing window may be provided on the sealed housing.
Optionally, the size of the heat and pressure insulating sleeve is adapted to the size of the sample receiving cavity. Optionally, the heat-insulating pressure-maintaining sleeve is used for isolating heat of the sample accommodating cavity and maintaining pressure of the sample accommodating cavity, and the flow direction is limited to be only the flow direction from the first water inlet to the second water outlet.
Alternatively, the insulating and pressure-retaining sleeve may be made of a ceramic material. For example, thermal and pressure jackets can withstand temperatures up to 2100 ℃ using silicate ceramics. The heat insulation and constant pressure effects of the upper and lower surrounding rocks in the coal bed are realized through the pressure maintaining and heat resisting effects of the ceramic on the outside of the sample accommodating cavity.
Optionally, if the reaction temperature in the simulated gasification cavity is above 1400 ℃, a thermal insulation layer may be further disposed on a side of the simulated gasification cavity close to the thermal insulation and pressure retention sleeve to prevent the thermal insulation and pressure retention effect of the thermal insulation and pressure retention sleeve from being affected by an excessive temperature. The heat insulating layer is made of high temperature resistant metal.
Optionally, in order to further enhance the heat and pressure insulating effect of the heat and pressure insulating sleeve on the sample accommodating cavity and the effect of limiting the water flowing direction, a second pressure controller connected with the heat and pressure insulating sleeve can be further provided.
Alternatively, the second pressure controller may take the form of a jacketed pump. The second pressure controller is used for generating pressure on the heat-insulation pressure-maintaining sleeve so as to further ensure that the coal rock sample to be measured in the sample containing cavity is in a sealed heat-insulation state and the flow direction of water is ensured. The casing pressure provided by the casing pressure pump may typically be in the range of 1-10 MPa.
Optionally, the apparatus of the present application further comprises a first pressure sensor disposed between the water supply device and the first water inlet.
Optionally, the device further comprises a temperature sensor and a second pressure sensor, and the temperature sensor and the second pressure sensor are both connected with the simulated gasification cavity.
Optionally, the apparatus may further comprise a first flow meter disposed between said water supply device and said first water inlet, and a second flow meter disposed on a side of said second water outlet remote from said second water inlet.
The first flow meter is primarily used to measure the flow of water transported by the water supply device through the first water inlet under injection pressure conditions. The second flowmeter is mainly used for measuring the flow of water discharged from the second water outlet.
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 cavity measured by the temperature sensor, the injection pressure data of the water measured by the first pressure sensor, the pressure data in the simulated gasification cavity measured by the second pressure sensor, the water flow data injected into the sample containing cavity measured by the first flowmeter and the water flow data discharged from the second water outlet measured by the second flowmeter are transmitted to the data collector.
Optionally, the data collector may also be connected to a computer data processing system for data storage and processing.
Optionally, the apparatus may further comprise 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 can also be collected by the data collector and transmitted to the computer data processing system.
This application has guaranteed the heat transfer heat conduction function of coal petrography rock sample through the one end of coal petrography sample and the direct linking to each other of simulation gasification chamber, has simulated the physical and chemical reaction in different areas such as oxidation zone, gasification zone, reduction zone, dry zone raw coal district in every layer.
The device for measuring the water invasion amount of the side wall of the gasification cavity in the coal gasification process realizes (1) simulation and control of the temperature and the pressure of the simulation gasification cavity; (2) The gasification reaction of the coal sample is controlled to be only carried out on the side surface of the coal rock in the simulated gasification cavity; (3) Simulating and controlling the flow of water invading into the simulation gasification cavity; (4) The limit water invasion amount under different temperature conditions can be determined through indoor experiments, so that favorable technical support is provided for water invasion amount control and temperature adjustment of underground coal gasification.
The method is mainly used for simulating the water invasion amount of the side wall coal sample of different coal types under different temperature and pressure conditions to provide support for experimental data of the water invasion amount of coal layers with different depths, thereby providing reliable data support for temperature and pressure control process conditions of coal layers with different depths, providing reasonable engineering parameters for the underground coal gasification process, and having positive significance for pilot test engineering implementation and underground coal gasification commercial development.
Additional features and advantages of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the present application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
FIG. 1 is a schematic cross-sectional view of an experimental simulated measurement of water intrusion at a gasification chamber sidewall in a coal gasification process according to an exemplary embodiment of the present application.
Description of reference numerals:
1-a water supply device; 2-a first flow meter; 3-a first pressure sensor; 4-a first water inlet; 5-sealing the shell; 6-heat insulation and pressure maintaining sleeve; 7-a sample receiving chamber; 8-a first water outlet; 8' -a second inlet; 9-a temperature sensor; 10-a second pressure sensor; 11-simulating a gasification cavity; 12-a viewing window; 13-a second pressure controller; 14-a temperature controller; 15-a first pressure controller; 16-a cooling device; 17-a second flow meter; 18-a data collector; 19-a control valve; 20-a second water outlet.
Detailed Description
The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with or instead of any other feature or element in any other embodiment, unless expressly limited otherwise.
The application provides an experimental simulation measuring device that gasification chamber lateral wall water invaded among coal gasification. The experimental simulation measuring device of this application includes: sealing the shell; a sample accommodating chamber which is arranged in the sealed shell and is configured to accommodate a coal rock sample to be measured, wherein the sample accommodating chamber is provided with 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; the simulated gasification cavity is arranged in the sealed shell and is provided with a second water inlet and a second water outlet opposite to the second water inlet, the second water inlet is communicated with the first water outlet, and the second water outlet is arranged on the sealed shell; a heat and pressure insulating sleeve disposed within the sealed housing, the heat and pressure insulating sleeve configured to surround the sample receiving cavity and separate the sample receiving cavity from the simulated gasification cavity; a water supply device configured to supply water into the sample-accommodating chamber via the first water inlet; a viewing window provided on the sealing case and configured to be able to see the first water outlet; a temperature controller coupled to the simulated gasification chamber and configured to control a temperature of the simulated gasification chamber; a first pressure controller coupled to the simulated gasification chamber and configured to control a pressure of the simulated gasification chamber.
FIG. 1 is a schematic cross-sectional view of an experimental simulated measurement of water intrusion at a gasification chamber sidewall in a coal gasification process according to an exemplary embodiment of the present application. As shown in fig. 1, a sample accommodating chamber 7 and a simulated vaporization chamber 11 are provided in the sealed case 5. The sealing case 5 may be made of stainless steel metal. The sample accommodating cavity 7 is used for accommodating a coal rock sample to be measured. The sample receiving chamber 7 has a first water inlet 4 at one end and a first water outlet 8 at the opposite end. The first water inlet 4 may be provided on the sealing case 5. One end of the simulated gasification chamber 11 has a second water inlet 8', and the second water inlet 8' and the first water outlet 8 can be the same or integrated, so that the two are water-communicating. A second water outlet 20 may be provided at the other end of the simulated gasification chamber 11, and the second water outlet 20 may be provided on the sealed housing 5. The sealed shell 5 is also internally provided with a heat-insulating and pressure-maintaining sleeve 6 made of high-temperature-resistant porous ceramic material. The heat and pressure insulating sleeve 6 is placed around the sample-receiving chamber 7 and separates the sample-receiving chamber 7 from the simulated gasification chamber 11.
Outside the sealed housing 5, upstream of the sample receiving chamber 7, a water supply device 1 is provided, which can be used to supply water into the sample receiving 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 rate value of water injected into the sample-accommodating chamber 7. The first pressure sensor 3 can measure the injection pressure of the water injected into the sample-accommodating chamber 7.
Outside the sealed shell 5, a temperature controller 14 and a first pressure controller 15 connected to the simulated gasification chamber 11 are also provided. 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 carried out in the gasification chamber during the actual gasification process.
The simulated gasification chamber 11 is also connected with a temperature sensor 9 and a second pressure sensor 10 to measure the temperature and pressure in the simulated gasification chamber 11.
The water discharged from the simulated gasification chamber 11 enters a cooling device 16 for cooling, and then the discharge flow rate value of the discharged water is measured by a second flowmeter 17. The injection flow value and the discharge flow value are then collected by the data collector 18.
Outside the sealed shell 5, a second pressure controller 13 is also provided, which is connected to the heat-insulating and pressure-retaining sleeve 6 through an opening in the sealed shell. The second pressure controller 13 is used to supply pressure to the insulating and pressure-retaining sheath 6.
The application provides an experiment analogue measurement device can measure the concrete numerical value of water invasion volume. The experimental simulation measurement process may include the following steps: a: setting a first pressure and a first temperature of the simulated gasification cavity, keeping the pressure and the temperature constant in the measurement process, and then putting a coal rock sample to be measured into the sample containing cavity; b: supplying water into the sample-receiving chamber at an initial flow rate for an initial period of time by a water supply device; c: observing the interface condition of a coal rock sample to be measured at the first water outlet through an observation window, and recording the flow of injected water, the flow of discharged water, time, pressure and temperature changes; d: if the interface condition is not changed, increasing the injection amount of water; e: repeating steps c and d; f: when water drops are observed to be generated on the end face of the coal rock sample to be measured at the first water outlet, the limit water intrusion amount under the first temperature and first pressure condition is obtained; g: and (e) changing the temperature and the pressure in the simulated gasification cavity, and repeating the steps b to f to obtain the limit water intrusion of the coal rock sample to be measured under different temperature and pressure conditions.
Specifically, the water intrusion of the coal sample with the diameter of 3.8cm and the length of 15cm is measured, and the inner diameter of the heat-insulating pressure-maintaining sleeve 6 is 3.8cm and the thickness of the heat-insulating pressure-maintaining sleeve is 2.1cm. The measurement process may comprise the steps of: (1) The pressure is adjusted to the experimental design pressure such as 4MPa by using a second pressure controller 13, and the pressure is always kept constant in the experimental process; (2) The temperature of the simulated gasification cavity 11 is heated and adjusted to the design temperature such as 600 ℃ by using a temperature controller 14, and the temperature in the simulated gasification cavity is always kept constant in the experimental process; (3) Then, starting a water supply device (such as a pressurized injection pump) from a small flow rate of 1mL/min, starting to continuously inject purified water by 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 of flow, time, pressure and temperature; (5) If the interface state is not changed, increasing the injection amount, such as 2mL/min or 3mL/min, and the like, repeating the steps (3) and (4), measuring the injection flow value of the water through the first flowmeter 2, measuring the discharge flow value of the water through the second flowmeter 17, collecting the values by the data collector 18, transmitting the values to the data processor, and subtracting the injection flow value from the discharge flow value to obtain the water invasion under the current temperature and pressure conditions.
The measurement process may further comprise the steps of: (6) Continuously injecting purified water, measuring the discharge flow value and the injection flow value when water drops are generated at one end of the coal rock sample directly connected with the simulation gasification cavity 11 from the observation window 12, subtracting the injection flow value from the discharge flow value to obtain the limit water intrusion amount under the temperature and pressure conditions, and quickly submerging the simulation gasification cavity 11; (7) And (5) changing the temperature and the pressure in the simulated gasification cavity 11, and repeating the steps (2) to (6), so that the limit water invasion amount of the coal rock sample under different temperature and pressure conditions can be obtained.
In this application, when the pressure of gasification chamber is constant, it is certain to have represented the actual degree of depth of coal seam, under the temperature condition of different simulation gasification chambers, and the measurement of water invasion volume and limit water invasion volume is carried out step by step: and (3) gradually flooding the simulated gasification cavity from low temperature to high temperature, and determining the limit water invasion amount at different temperatures, wherein the value of the limit water invasion amount is continuously increased.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the purpose of facilitating understanding of the present application, and are not intended to limit the present application. 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 disclosure as defined by the appended claims.
Claims (9)
1. The utility model provides an experimental simulation measuring device that gasification chamber lateral wall water invaded among coal gasification, its characterized in that includes:
sealing the shell;
a sample receiving chamber disposed within the sealed housing and configured to receive a coal rock sample to be measured, the sample receiving chamber having a first water inlet and a first water outlet opposite the first water inlet, the first water inlet being disposed on the sealed housing;
a simulated gasification chamber disposed within the sealed housing, the simulated gasification chamber having a second water inlet in water communication with the first water outlet and a second water outlet opposite the second water inlet, the second water outlet disposed on the sealed housing;
a thermally and pressure insulating sleeve disposed within the sealed envelope, the thermally and pressure insulating sleeve configured to surround the sample receiving cavity and separate the sample receiving cavity from the simulated gasification cavity;
a water supply device configured to supply water into the sample-accommodating chamber via the first water inlet;
a viewing window disposed on the sealed housing and configured to enable viewing of the first water outlet;
a temperature controller coupled to the simulated gasification chamber and configured to control a temperature of the simulated gasification chamber;
a first pressure controller coupled to the simulated gasification chamber and configured to control a pressure of the simulated gasification chamber.
2. The analog measuring device of claim 1, further comprising a second pressure controller coupled to the insulating and pressure retaining sleeve and configured to pressurize the insulating and pressure retaining sleeve.
3. Analog measuring device according to claim 1 or 2, characterized in that the pressure-insulating jacket is made of a ceramic material.
4. The analog measuring device of claim 1, further comprising a first pressure sensor disposed between the water supply and the first water inlet.
5. The analog measurement device of claim 1, further comprising a temperature sensor and a second pressure sensor, both of which are coupled to the analog gasification chamber.
6. The analog measuring device of claim 1, further comprising a first flow meter disposed between the water supply apparatus and the first water inlet and a second flow meter disposed on a side of the second water outlet remote from the second water inlet.
7. The analog measuring device of claim 1, further comprising a data collector, wherein 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 measuring device of claim 1, wherein a thermal insulation layer is disposed on a side of the analog gasification chamber adjacent to the thermal insulation and pressure retention sleeve.
9. The analog measuring device of claim 1, wherein the first pressure controller is a backpressure pump; the second pressure controller is a jacket pressure pump.
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