Coal sample tank for coal spontaneous combustion temperature programming experiment

Abstract

The utility model discloses a coal sample tank for a coal spontaneous combustion temperature programming experiment, which comprises a coal sample tank body, the outer side of the bottom of the coal sample tank body is connected with a gas buffer chamber through a pipeline, and the gas buffer chamber is provided with a gas inlet; a heat-insulating layer is arranged on the inner wall of the coal sample tank body; a first filter screen is horizontally arranged in the coal sample tank body, and the center of the first filter screen protrudes; a coal sample tank cover is detachably arranged at the top of the coal sample tank body, an air outlet is formed in the coal sample tank cover, and a second filter screen is arranged at the air outlet; at least four first thermocouples with different heights are arranged in the coal sample tank body, and the first thermocouples penetrate through the coal sample tank cover and extend into a cavity of the coal sample tank body. The utility model aims to provide a coal sample tank for a coal spontaneous combustion temperature programming experiment, and solves the problems that in the prior art, gas is not uniformly distributed when entering the coal sample tank, and moves along the smooth side wall of the coal sample tank, so that the middle part of a coal sample cannot be effectively heated, and the difference between an experimental result and an actual result is large.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal sample cans and relates to a coal sample can for a programmed temperature rise experiment of coal spontaneous combustion. Background Art

[0002] Programmed temperature experiments are often used in the coal mining field to study the characteristics of coal spontaneous combustion processes. They are an important means of analyzing the basic characteristic parameters of coal spontaneous combustion. For example, the determination of parameters such as the optimization of coal spontaneous combustion marker gas, the shortest experimental spontaneous combustion period of coal, and the oxygen consumption rate of coal all require the use of programmed temperature experimental equipment.

[0003] At present, the conventional coal sample tank used in the programmed temperature rise experiment of coal spontaneous combustion has a hole at the bottom, and the high-temperature gas delivered by the gas supply system is directly introduced from the bottom of the coal sample. However, due to inertia, this method will cause the gas entering the coal sample tank to be unevenly distributed, and the gas will move along the smooth side wall of the coal sample tank, and it will not be able to effectively heat the middle of the coal sample, resulting in a large difference between the experimental results and the actual results. Utility Model Content

[0004] The utility model aims to provide a coal sample tank for a programmed temperature increase experiment on coal spontaneous combustion, which solves the problem in the prior art that the gas entering the coal sample tank is unevenly distributed and moves along the smooth side wall of the coal sample tank, making it impossible to effectively heat the middle of the coal sample, resulting in a large difference between the experimental results and the actual results.

[0005] The technical scheme adopted by the utility model is that a coal sample tank for a programmed temperature rise experiment of coal spontaneous combustion comprises a coal sample tank body, the outer side of the bottom of the coal sample tank body is connected to a gas buffer chamber through a pipeline, and the gas buffer chamber is provided with an air inlet; a thermal insulation layer is provided on the inner wall of the coal sample tank body; a first filter screen is horizontally provided inside the coal sample tank body, and the center of the first filter screen is convex; a coal sample tank cover is detachably provided on the top of the coal sample tank body, and a gas outlet is provided on the coal sample tank cover, and a second filter screen is provided at the gas outlet; at least 4 first thermocouples of different heights are provided in the coal sample tank body, and the first thermocouples penetrate the coal sample tank cover and penetrate into the coal sample tank body cavity.

[0006] The utility model is also characterized in that:

[0007] Scale lines are set on the inner wall of the coal sample tank body.

[0008] The coal sample tank cover is fastened to the top of the coal sample tank body by bolts.

[0009] A sealing ring is arranged between the coal sample tank cover and the coal sample tank body.

[0010] The bottom of the coal sample tank body is detachably connected with a base bracket, and the gas buffer chamber is fixed on the base bracket.

[0011] A second thermocouple is arranged in the gas buffer chamber.

[0012] The beneficial effects of the utility model are:

[0013] This new type of coal sample tank for the programmed temperature rise experiment of coal spontaneous combustion is used. By setting up a gas buffer chamber, the velocity and flow rate of the coal sample tank's intake airflow are more stable; the filter screen set in the middle of the coal sample tank makes the intake airflow diffuse more widely and the heating of the coal sample more uniform; the coal sample tank adopts a micro-nano insulation layer with deep and shallow ripples on the surface, which has better insulation effect and increases the resistance of the gas flowing along the side wall of the coal sample tank; the coal sample tank cover is equipped with a filter screen, which can effectively prevent the coal sample from blocking the outlet and affecting the gas analysis results. The coal sample tank has the advantages of simple operation and good coal sample heating effect, which meets the heating requirements of the coal sample in the programmed temperature rise experiment of coal spontaneous combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a coal sample tank for a programmed temperature rise experiment of coal spontaneous combustion according to the utility model;

[0015] Figure 2 The utility model is a top view of a coal sample tank for a programmed temperature increase experiment of coal spontaneous combustion.

[0016] In the figure: 1. Coal sample tank body; 2. Air inlet; 3. Gas buffer chamber; 4. Base bracket; 5. Thermal insulation layer; 6. Second filter screen; 7. First filter screen; 8. Coal sample tank cover; 9. Air outlet; 10. First thermocouple; 11. Second thermocouple. DETAILED DESCRIPTION

[0017] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0018] The coal sample tank for the programmed temperature rise experiment of coal spontaneous combustion includes a coal sample tank body 1, a gas buffer chamber 3 is connected to the outer side of the bottom of the coal sample tank body 1, and the coal sample tank body 1 and the gas buffer chamber 3 are connected by a stainless steel pipeline. The gas buffer chamber 3 is used to buffer the pressurized gas delivered by the gas supply system, and the gas buffer chamber 3 is provided with an air inlet 2, and the pressurized gas enters from the air inlet 2. A second thermocouple 11 is arranged in the gas buffer chamber 3 to monitor the intake air temperature.

[0019] A thermal insulation layer 5 is arranged on the inner wall of the coal sample tank body 1. The thermal insulation layer adopts a micro-nano insulation board with deep and shallow corrugations on the surface, which is used to increase the resistance of gas flowing along the side wall of the coal sample tank; scale lines are arranged on the inner wall of the coal sample tank body 1, and the position of the scale lines is the coal sample filling height.

[0020] A first filter screen 7 is horizontally arranged inside the coal sample tank body 1, and the center of the first filter screen 7 is raised. The first filter screen 7 is mainly used to support the coal sample and allow the intake air flow to heat the middle of the coal sample, and is also used to separate the coal sample and the intake air flow; a coal sample tank cover 8 is detachably arranged on the top of the coal sample tank body 1, and the coal sample tank 8 is fastened to the top of the coal sample tank body 1 by bolts, and a sealing ring is arranged between the two. The coal sample tank cover 8 is provided with an air outlet 9, and the air outlet 9 can transport the gas generated in the coal sample tank into the gas detection and analysis system. A second filter screen 6 is arranged at the air outlet 9; at least four first thermocouples 10 of different heights are arranged in the coal sample tank body 1, and the first thermocouple 10 penetrates the coal sample tank cover 8 and penetrates into the cavity of the coal sample tank body 1. The detection signals of the first thermocouple 10 and the second thermocouple 11 are collected in real time by the temperature detection system.

[0021] The bottom of the coal sample tank body 1 is detachably connected to a base bracket 4 , and the gas buffer chamber 3 is fixed on the base bracket 4 .

[0022] Working principle of this utility model:

[0023] Open the coal sample tank cover 8, add the screened coal sample until the height of the coal sample reaches the scale line on the inner wall of the coal sample tank, stop adding the sample, close the coal sample tank cover 8, place a sealing ring between the coal sample tank body 1 and the coal sample tank cover 8, and use bolts to connect and tighten the two. When conducting the experiment, the gas supply system continuously delivers high-temperature gas to the gas buffer chamber 3. The high-temperature gas enters the coal sample tank body 1 and infiltrates into the coal sample through the first filter 7 to heat the coal sample. All mixed gases generated by the coal sample tank body 1 enter the gas detection and analysis system through the gas outlet 9, and the components and concentrations of the mixed gases are analyzed in real time. The first thermocouple 10 and the second thermocouple 11 are connected to the temperature detection system, and the temperature detection system detects the intake temperature in the gas buffer chamber 3 and the coal temperature in the coal sample tank body 1 in real time.

[0024] Embodiment 1:

[0025] The coal sample tank for the programmed temperature rise experiment of coal spontaneous combustion includes a coal sample tank body 1, which is made of cylindrical stainless steel. The outer side of the bottom of the coal sample tank body 1 is connected to a gas buffer chamber 3 through a pipeline, and the gas buffer chamber 3 is provided with an air inlet 2; the inner wall of the coal sample tank body 1 is provided with a thermal insulation layer 5, and the thermal insulation layer 5 adopts a micro-nano thermal insulation board with deep and shallow corrugations on the surface; the first filter screen 7 is horizontally arranged inside the coal sample tank body 1, and the center of the first filter screen 7 is convex; the top of the coal sample tank body 1 is detachably provided with a coal sample tank cover 8, and the coal sample tank cover 8 is provided with an air outlet 9, and a second filter screen 6 is arranged at the air outlet 9; the first filter screen 7 and the second filter screen 6 are stainless steel filter screens with a mesh number of not less than 500 meshes and a thickness of not more than 1mm. At least 4 first thermocouples 10 of different heights are arranged in the coal sample tank body 1, and the first thermocouple 10 penetrates the coal sample tank cover 8 and penetrates into the cavity of the coal sample tank body 1.

[0026] A second thermocouple 11 is arranged in the gas buffer chamber 3 .

[0027] Embodiment 2:

[0028] The coal sample tank for the programmed temperature rise experiment of coal spontaneous combustion includes a coal sample tank body 1, which is made of cylindrical stainless steel. The outer side of the bottom of the coal sample tank body 1 is connected to a gas buffer chamber 3 through a pipeline, and the gas buffer chamber 3 is provided with an air inlet 2; the inner wall of the coal sample tank body 1 is provided with a thermal insulation layer 5, and the thermal insulation layer 5 adopts a micro-nano thermal insulation board with deep and shallow corrugations on the surface; the first filter screen 7 is horizontally arranged inside the coal sample tank body 1, and the center of the first filter screen 7 is convex; the top of the coal sample tank body 1 is detachably provided with a coal sample tank cover 8, and the coal sample tank cover 8 is provided with an air outlet 9, and a second filter screen 6 is arranged at the air outlet 9; the first filter screen 7 and the second filter screen 6 are stainless steel filter screens with a mesh number of not less than 500 meshes and a thickness of not more than 1mm. At least 4 first thermocouples 10 of different heights are arranged in the coal sample tank body 1, and the first thermocouple 10 penetrates the coal sample tank cover 8 and penetrates into the cavity of the coal sample tank body 1.

[0029] A second thermocouple 11 is arranged in the gas buffer chamber 3 .

[0030] Scale lines are arranged on the inner wall of the coal sample tank body 1 .

[0031] The bottom of the coal sample tank body 1 is detachably connected with a base support 4, and the gas buffer chamber 3 is fixed on the base support 4. The base support 4 is made of stainless steel.

[0032] Embodiment 3:

[0033] The coal sample tank for the programmed temperature rise experiment of coal spontaneous combustion includes a coal sample tank body 1, which is made of cylindrical stainless steel. The outer side of the bottom of the coal sample tank body 1 is connected to a gas buffer chamber 3 through a pipeline, and the gas buffer chamber 3 is provided with an air inlet 2; the inner wall of the coal sample tank body 1 is provided with a thermal insulation layer 5, and the thermal insulation layer 5 adopts a micro-nano thermal insulation board with deep and shallow corrugations on the surface; the first filter screen 7 is horizontally arranged inside the coal sample tank body 1, and the center of the first filter screen 7 is convex; the top of the coal sample tank body 1 is detachably provided with a coal sample tank cover 8, and the coal sample tank cover 8 is provided with an air outlet 9, and a second filter screen 6 is arranged at the air outlet 9; the first filter screen 7 and the second filter screen 6 are stainless steel filter screens with a mesh number of not less than 500 meshes and a thickness of not more than 1mm. At least 4 first thermocouples 10 of different heights are arranged in the coal sample tank body 1, and the first thermocouple 10 penetrates the coal sample tank cover 8 and penetrates into the cavity of the coal sample tank body 1.

[0034] A second thermocouple 11 is arranged in the gas buffer chamber 3 .

[0035] Scale lines are arranged on the inner wall of the coal sample tank body 1 .

[0036] A base support 4 is detachably connected to the bottom of the coal sample tank body 1 , and the gas buffer chamber 3 is fixed on the base support 4 .

[0037] The coal sample tank cover 8 is fastened to the top of the coal sample tank body 1 by bolts.

[0038] A sealing ring is arranged between the coal sample tank cover 8 and the coal sample tank body 1 .

Claims

1. A coal sample tank for programmed temperature rise experiment of coal spontaneous combustion, characterized in that: The invention comprises a coal sample tank body (1), wherein the outer side of the bottom of the coal sample tank body (1) is connected to a gas buffer chamber (3) through a pipeline, and the gas buffer chamber (3) is provided with an air inlet (2); a thermal insulation layer (5) is provided on the inner wall of the coal sample tank body (1); a first filter screen (7) is horizontally provided inside the coal sample tank body (1), and the center of the first filter screen (7) is raised; a coal sample tank cover (8) is detachably provided on the top of the coal sample tank body (1), and the coal sample tank cover (8) is provided with an air outlet (9), and a second filter screen (6) is provided at the air outlet (9); at least four first thermocouples (10) of different heights are provided in the coal sample tank body (1), and the first thermocouple (10) passes through the coal sample tank cover (8) and penetrates into the cavity of the coal sample tank body (1).

2. The coal sample tank for programmed temperature increase experiment of coal spontaneous combustion according to claim 1, characterized in that: Scale lines are arranged on the inner wall of the coal sample tank body (1).

3. The coal sample tank for programmed temperature increase experiment of coal spontaneous combustion according to claim 1, characterized in that: The coal sample tank cover (8) is fastened to the top of the coal sample tank body (1) by means of bolts.

4. The coal sample tank for programmed temperature increase experiment of coal spontaneous combustion according to claim 1, characterized in that: A sealing ring is arranged between the coal sample tank cover (8) and the coal sample tank body (1).

5. The coal sample tank for programmed temperature increase experiment of coal spontaneous combustion according to claim 1, characterized in that: The bottom of the coal sample tank body (1) is detachably connected to a base support (4), and the gas buffer chamber (3) is fixed on the base support (4).

6. The coal sample tank for programmed temperature increase experiment of coal spontaneous combustion according to claim 1, characterized in that: A second thermocouple (11) is arranged in the gas buffer chamber (3).

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