CN115977608A - Experimental simulation measuring device for water invasion of gasification cavity side wall in coal gasification process - Google Patents

Abstract

The application relates to an experimental simulation measuring device for water intrusion on the side wall of a gasification chamber during a coal gasification process. The device of the present application includes a sealed shell, a sample holding chamber, a simulated gasification chamber, a heat-insulating and pressure-preserving sleeve, a water supply device, an observation window, a temperature controller and a first pressure controller. This application provides reliable data support for the temperature and pressure control process conditions of coal seams at different depths by simulating the water intrusion of side wall coal samples of different coal types 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 the pilot test project and the commercial development of underground coal gasification.

Description

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

technical field

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 the coal gasification process.

Background technique

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

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

Contents of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the application.

In one aspect, the present application provides an experimental simulation measurement device for water intrusion on the side wall of the gasification chamber during the coal gasification process, including:

Sealed shell;

a sample holding chamber, which is arranged in the sealed shell and configured to hold the coal rock sample to be measured, the sample holding chamber has a first water inlet and a first outlet opposite to the first water inlet A water port, the first water inlet is arranged on the sealed shell;

A simulated gasification chamber, which is arranged in the sealed shell, the simulated gasification chamber has a second water inlet and a second water outlet opposite to the second water inlet, the second water inlet is connected to the second water inlet The first water outlet is in communication with water, and the second water outlet is arranged on the sealed shell;

a heat-insulating and pressure-preserving sleeve, which is arranged in the sealed shell, and the heat-insulating and pressure-preserving sleeve is configured to surround the sample holding chamber and separate the sample holding chamber from the simulated gasification chamber;

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

an observation window, which is arranged on the sealing case and configured to be able to see 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 configured to control the pressure of the simulated gasification chamber.

In this application, the term "coal rock sample" mainly refers to (1) a coal sample taken from the side wall of a real gasification chamber of a coal seam; (2) a side-coked coal sample fired in a laboratory; and (3) Raw coal samples, including natural raw coal samples and artificially produced coal samples.

In this application, the sealed shell is a shell made of airtight or watertight materials, such as special steel, stainless steel, and the like. For example, the sealed shell made of stainless steel can withstand temperatures as high as 1200 ° C, which better solves the problem of temperature and pressure bearing of the device.

In the present application, the size of the sealing shell in the first direction is larger than the size of the sealing shell in the second direction, and the first direction is perpendicular to the second direction.

In the present application, the first direction generally refers to the length direction of the sealing case, and the second direction generally refers to the width direction of the sealing case. The dimension of the sealing shell in the first direction generally refers to the length, and the dimension of the sealing shell in the second direction generally refers to the width. Typically, the length dimension is larger or much larger than the width dimension.

In the present application, the sealing shell can be in different shapes, for example, in the shape of a strip, including a cylinder and the like. Optionally, the sealing shell is in the shape of a cylinder. At this time, the size of the sealing shell in the first direction usually refers to the axial length of the sealing shell cylinder (ie, the height of the cylinder), and the size of the sealing shell in the second direction usually refers to the length of the sealing shell cylinder. Diameter dimension (i.e. the base diameter of the cylinder).

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

The length of the sample holding chamber may vary. If the length of the coal rock sample is less than the size of the sample holding chamber, a high-permeability substitute rock sample can be placed in the sample holding chamber to adjust the position of the coal rock sample and the filling position when the length of the rock sample is insufficient, which can Adjustments are made according to the different conditions of the obtained coal rock samples.

In this 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 ingress and limit water intrusion under different temperature and pressure conditions.

The temperature conditions in the simulated gasification chamber can be controlled by a temperature controller, including raising (such as heating) or reducing the temperature of the simulated gasification chamber through the temperature controller in different heating methods to adjust or maintain the temperature in the simulated gasification chamber. temperature.

The pressure condition in the simulated gasification chamber can be controlled by the first pressure controller, including increasing or decreasing the pressure of the simulated gasification chamber through the first pressure controller to adjust or maintain the pressure in the simulated gasification chamber.

Optionally, the water supply device can deliver water in the form of a pressurized pump. Optionally, the pressurizing pump may also have a heater to deliver and inject water with different injection pressures and injection temperatures into the sample holding chamber.

Optionally, the first pressure controller may take the form of a back pressure pump. The first pressure controller can be used to ensure the flow direction of water 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 can generally be in the range of 1-10 MPa.

Optionally, the observation window may be transparent, so as to ensure that the water intrusion effect on the end face of the first water outlet can be observed from the outside of the sealed casing, and the limit water intrusion can be judged. The observation window can be arranged on the sealed shell.

Optionally, the size of the heat-insulating and pressure-preserving sleeve is adapted to the size of the sample holding chamber. Optionally, the heat-insulating and pressure-preserving sleeve is used to insulate the heat of the sample holding chamber and maintain the pressure of the sample holding chamber, and the flow direction is limited to the flow direction from the first water inlet to the second water outlet.

Optionally, the heat-insulating and pressure-preserving sleeve can be made of ceramic material. For example, silicate ceramics are used for heat insulation and pressure-preserving sleeves, which can withstand temperatures as high as 2100 °C. The heat insulation and constant pressure functions of the upper and lower surrounding rocks in the coal seam are realized through the pressure maintaining and heat resistance functions of the ceramics outside the sample holding chamber.

Optionally, if the reaction temperature in the simulated gasification chamber is as high as 1400°C or higher, a heat insulation layer can be installed on the side of the simulated gasification chamber close to the heat-insulation and pressure-preserving sleeve to prevent the excessive temperature from affecting the heat-insulation protection. The heat insulation and pressure maintaining function of the pressure sleeve. The insulation layer is made of high temperature resistant metal.

Optionally, in order to further enhance the heat-insulating and pressure-maintaining effect of the heat-insulating and pressure-preserving sleeve on the sample holding chamber and the function of limiting the flow direction of water, a second pressure controller connected to the heat-insulating and pressure-preserving sleeve may also be provided.

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

Optionally, the device of the present application further includes a first pressure sensor disposed between the water supply device and the first water inlet.

Optionally, the device further includes a temperature sensor and a second pressure sensor, both of which are connected to the simulated gasification chamber.

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

The first flow meter is mainly used to measure the water flow delivered by the water supply device through the first water inlet under injection pressure conditions. The second flowmeter is mainly used to measure the flow of water discharged from the second water outlet.

Optionally, 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 device. 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 first flowmeter The measured water flow data injected into the sample holding chamber and the water flow data measured by the second flowmeter and discharged from the second water outlet will be transmitted to the data collector.

Optionally, the data collector can also be connected with a computer data processing system for data storage and processing.

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 can also be collected by the data collector and transmitted to the computer data processing system.

In this application, one end of the coal rock sample is directly connected to the simulated gasification chamber, which ensures the heat transfer function of the coal rock sample, and simulates the oxidation zone, gasification zone, reduction zone, drying zone, raw coal zone, etc. in each layer. Physicochemical reactions in different regions.

The device for measuring the water intrusion on the side wall of the gasification chamber in the coal gasification process of 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 only It is carried out on the side of the coal rock in the simulated gasification chamber; (3) Simulate and control the flow of water intrusion into the simulated gasification chamber; (4) The limit water intrusion under different temperature conditions can be determined through indoor experiments, so as to provide the coal underground The gasification water intrusion control and temperature adjustment provide favorable technical support.

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

Additional features and advantages of the application will be set forth in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the application. Other advantages of the present application can be realized and obtained through the schemes described in the specification and drawings.

Description of drawings

The accompanying drawings are used to provide an understanding of the technical solution of the present application, and constitute a part of the description, and are used together with the embodiments of the present application to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

Fig. 1 is a schematic cross-sectional view of an experimental simulation measurement device for water intrusion in a side wall of a gasification chamber during a coal gasification process according to an exemplary embodiment of the present application.

Explanation of reference signs:

1-water supply equipment; 2-the first flowmeter; 3-the first pressure sensor; 4-the first water inlet; 1 water outlet; 8'-second water inlet; 9-temperature sensor; 10-second pressure sensor; 11-simulated gasification chamber; 12-observation window; 13-second pressure controller; 14-temperature controller; 15-first pressure controller; 16-cooling device; 17-second flow meter; 18-data collector; 19-control valve; 20-second water outlet.

Detailed ways

The application describes a number of embodiments, but the description is illustrative rather than restrictive, and it will be obvious to those skilled in the art that there may be more embodiments within the scope of the embodiments described in the application. Many examples and implementations. 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. Except where expressly limited, any feature or element of any embodiment may be used in combination with, or substituted for, any other feature or element of any other embodiment.

The present application provides an experimental simulation measurement device for water intrusion on the side wall of a gasification chamber during a coal gasification process. The experimental simulation measurement device of the present application includes: a sealed shell; a sample holding chamber, which is arranged in the sealed shell and configured to hold the coal rock sample to be measured, and the sample holding chamber has a first water inlet and a first water inlet. The first water outlet opposite to the water inlet, the first water inlet is arranged on the sealed shell; the simulated gasification chamber is arranged in the sealed casing, and the simulated gasification chamber has a second water inlet and a second water inlet opposite to the second water inlet. The water outlet, the second water inlet is in communication with the first water outlet, and the second water outlet is arranged on the sealed shell; the heat-insulating and pressure-preserving sleeve is arranged in the sealed shell, and the heat-insulating and pressure-preserving sleeve is configured to surround the sample The chamber separates the sample holding chamber from the simulated gasification chamber; the water supply device is configured to supply water into the sample holding chamber through the first water inlet; the observation window is arranged on the sealed case and configured To be able to see the first water outlet; a temperature controller, which is connected to the simulated gasification chamber and configured to control the temperature of the simulated gasification chamber; a first pressure controller, which is connected to the simulated gasification chamber and configured to control Simulate the pressure of the gasification chamber.

Fig. 1 is a schematic cross-sectional view of an experimental simulation measurement device for water intrusion in a side wall of a gasification chamber during a coal gasification process according to an exemplary embodiment of the present application. As shown in FIG. 1 , a sample holding chamber 7 and a simulated gasification chamber 11 are arranged in the sealed case 5 . The sealing case 5 may be made of stainless steel. The sample holding chamber 7 is used to place the coal rock sample to be measured. One end of the sample holding chamber 7 has a first water inlet 4 , and the opposite end has a first water outlet 8 . The first water inlet 4 can be arranged 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 connected by water. 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 sealing shell 5 . A heat-insulating and pressure-preserving sleeve 6 made of high-temperature-resistant porous ceramic material is also arranged in the sealed shell 5 . The heat-insulating and pressure-preserving sleeve 6 is placed around the sample holding chamber 7 and separates the sample holding chamber 7 from the simulated gasification chamber 11 .

Outside the sealed housing 5 , upstream of the sample holding chamber 7 , a water supply device 1 is provided, which can be used to supply water into the sample holding chamber 7 via the first water inlet 4 . A first flow meter 2 and a first pressure sensor 3 are arranged 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 .

Outside the sealed casing 5, a temperature controller 14 and a first pressure controller 15 connected to the simulated gasification chamber 11 are also arranged. 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.

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 the cooling device 16 to be cooled, and then the discharge flow value of the discharged water is measured by the second flow meter 17 . Then, the injection flow value and the discharge flow value are collected by the data collector 18 .

Outside the sealed case 5, a second pressure controller 13 connected to the heat-insulating and pressure-preserving sleeve 6 through an opening on the sealed case is also arranged. The second pressure controller 13 is used to provide pressure to the heat-insulation and pressure-preserving sleeve 6 .

The experimental simulation measuring device provided in this 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 put the coal rock sample to be measured into the sample holding chamber Middle; b: water is supplied to the sample holding chamber at the initial flow rate through the water supply equipment for an initial period of time; c: the interface condition of the coal-rock sample to be measured at the first water outlet is observed through the observation window, and the injection time is recorded. Changes in water flow, discharge water flow, time, pressure and temperature; d: If there is no change in the interface condition, increase the injection volume of water; e: Repeat steps c and d; f: When the first water outlet is observed When there are water droplets on the end face of the coal rock sample to be measured, 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, the limit water intrusion of the coal rock sample to be measured under different temperature and pressure conditions is obtained.

Specifically, to measure the water intrusion of a coal sample with a diameter of 3.8 cm and a length of 15 cm, the inner diameter of the heat-insulating and pressure-preserving sleeve 6 can be designed to be 3.8 cm and the thickness to be 2.1 cm. The measurement process may include steps: (1) utilize the second pressure controller 13 to adjust the pressure to the experimental design pressure such as 4MPa, and keep the pressure constant during the experiment; (2) utilize the temperature controller 14 to simulate the temperature of the gasification chamber 11 The temperature is heated and adjusted to the design temperature such as 600 ° C. During the experiment, the temperature in the simulated vaporization chamber is kept constant; (3) Then, turn on the water supply equipment (such as a pressurized injection pump) and start with a small flow rate of 1 mL/min. Continue to inject pure water from the injection pump, and continue to inject for 5 minutes; (4) observe the interface conditions of the coal and rock samples through the observation window 12, and record the changes in flow, time, pressure and temperature; (5) if there is no change in the interface conditions, Increase the injection volume, such as 2mL/min or 3mL/min, etc., repeat steps (3) and (4), measure the injection flow value of water through the first flowmeter 2, and measure the discharge flow rate of water through the second flowmeter 17 These values are collected by the data collector 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.

The measurement process can also include the steps: (6) continue to inject pure water, when it is observed from the observation window 12 that there is water droplet at one end of the coal rock sample directly connected with the simulated gasification chamber 11, measure the discharge flow value at this time and the injection flow rate value, the limit water intrusion under the temperature and pressure conditions can be obtained by subtracting the injection flow rate value from the discharge flow rate value, after which the simulated gasification chamber 11 will be flooded soon; (7) Change the simulated gasification chamber The temperature and pressure in 11, repeat steps (2)-(6), then the limit water intrusion of the coal rock sample under different temperature and pressure conditions can be obtained.

In this application, when the pressure of the gasification chamber is constant, it means that the actual depth of the coal seam is constant. Under different temperature conditions of the simulated gasification chamber, the measurement of water intrusion and limit water influx is carried out step by step: from The simulated gasification chamber is gradually flooded from low temperature to high temperature, and the limit water intrusion at different temperatures is determined, and the value of the limit water intrusion is constantly increasing.

Although the embodiments disclosed in the present application are as above, the content described is only the embodiments adopted to facilitate understanding of the present application, and is not intended to limit the present application. Anyone skilled in the field of this application 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 protection scope of this application must still be The scope defined in the appended claims shall prevail.

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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