CN109613060B - Device and method for measuring gas explosion lower limit under heat storage oxidation high temperature condition - Google Patents
Device and method for measuring gas explosion lower limit under heat storage oxidation high temperature condition Download PDFInfo
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Abstract
The invention discloses a device and a method for measuring the lower limit of gas explosion under the condition of heat storage oxidation high temperature, and the device comprises a heating device for heating air or gas and a sensor assembly arranged on the heating device, wherein the heating device comprises an outer wall and a heating assembly arranged in the outer wall, the center of the outer wall is provided with a flow channel for air or gas to flow through, the middle part of the flow channel is provided with a heating cavity formed by an expanding section with a diameter larger than that of the flow channel, the heating assembly is positioned in the heating cavity, the heating assembly comprises an inner wall and heat storage ceramic which are sequentially arranged from outside to inside, an electric heater for heating the heat storage ceramic is arranged on the inner wall of the inner wall, the center of the heat storage ceramic is provided with a vent hole communicated with the flow channel, and the sensor assembly comprises a pressure sensor for detecting the pressure in the heating cavity and a temperature sensor for detecting the temperature in the heating cavity. The invention can measure the lower explosion limit of the gas at the high temperature of over 900 ℃, improve the measuring range and ensure the accuracy of the test.
Description
Technical Field
The invention relates to the field of coal mine safety, in particular to a device and a method for measuring the lower limit of gas explosion under the condition of heat storage oxidation high temperature.
Background
At present, the method for measuring the lower limit of gas explosion under high-temperature conditions at home and abroad generally comprises the steps of heating the gas in a closed container, igniting by using an ignition flower, and judging whether the gas is exploded or not by observing flame or pressure difference before and after ignition. However, the traditional method cannot measure the lower explosion limit of the gas at the high temperature of over 700 ℃, and cannot ensure the accuracy of the test.
Disclosure of Invention
In view of the above, the present invention provides a device and a method for measuring the lower explosion limit of gas under the condition of thermal storage oxidation high temperature, which can measure the lower explosion limit of gas under the condition of high temperature above 900 ℃, improve the measurement range, and ensure the accuracy of the test.
The device for measuring the lower limit of gas explosion under the high-temperature condition of heat accumulation oxidation comprises a heating device for heating air or gas and a sensor component arranged on the heating device, the heating device comprises an outer wall and a heating component arranged in the outer wall, a flow passage for air or gas to flow through is arranged in the center of the outer wall, the middle part of the flow passage is provided with an expanding section with the diameter larger than that of the flow passage to form a heating cavity, the heating assembly is positioned in the heating cavity, the heating component comprises an inner wall and heat storage ceramics which are sequentially arranged from outside to inside, an electric heater for heating the heat storage ceramics is arranged on the inner wall of the inner wall, the heat accumulation ceramic center is equipped with the air vent with the runner intercommunication, sensor module is including being used for carrying out the pressure sensor that detects and being used for carrying out the temperature sensor that detects to heating intracavity temperature to heating intracavity pressure.
Further, a heat insulation layer is arranged between the outer wall of the inner wall and the inner wall of the heating cavity.
Further, the heat-insulating layer is of a double-layer structure consisting of a ceramic fiber board layer and a high-alumina ceramic fiber board layer.
Furthermore, the heat storage ceramic is positioned in the center of the heating cavity, and the outer wall of the heat storage ceramic is sealed with the inner wall through refractory mortar.
Further, the heat accumulation pottery is two, and two heat accumulation pottery set up side by side along the heating chamber axial, and sealed fixed through refractory mortar between two heat accumulation pottery.
Further, the axis of the vent hole overlaps with the axis of the flow passage.
Further, the outer surface of the outer wall is provided with a shell, the shell is made of steel, and the outer wall and the inner wall are both refractory bricks.
Furthermore, the pressure sensors and the temperature sensors are both vertically arranged on the outer wall, the pressure sensors and the temperature sensors are respectively positioned on two sides of the outer wall, the two pressure sensors are symmetrically arranged at two axial ends of the heating cavity along the axial direction, and the heat storage ceramic is positioned between the two pressure sensors; the number of the temperature sensors is seven, and the temperature sensors are temperature sensors with S graduation numbers.
The invention also provides a method for determining the lower limit of gas explosion under the high-temperature condition of heat storage oxidation, which comprises the following steps:
a. preheating the heat storage ceramic in the heating device to a specified temperature, vacuumizing the heating cavity, introducing air into the heating cavity after vacuumizing is finished, heating the air to a test temperature by the wall of a high-temperature vent hole after the air passes through the vent hole of the heat storage ceramic, and synchronously recording the pressure P0 before the air enters the vent hole of the heat storage ceramic and the pressure P1 after the air passes through the vent hole of the heat storage ceramic;
b. preheating the heat storage ceramic in the heating device to a specified temperature, vacuumizing the heating cavity, introducing gas into the heating cavity after vacuumizing is finished, heating the gas to a test temperature by the wall of a high-temperature vent hole after the gas passes through the vent hole of the heat storage ceramic, and synchronously recording the pressure P0' before the gas enters the vent hole of the heat storage ceramic and the pressure P2 after the gas passes through the vent hole of the heat storage ceramic;
c. comparing P1 with P2, judging whether the soft sealing end is exploded or not by combining with whether the soft sealing end is broken or not, if the soft sealing end is not exploded, keeping the temperature unchanged, increasing the concentration of introduced gas, and repeating the test; if the explosion is judged, the temperature is changed, and the next test is carried out.
Further, the pressure P0 before the air enters the vent holes of the heat storage ceramic in the step a is equal to the pressure P0' before the air enters the vent holes of the heat storage ceramic in the step b; the increase of the gas concentration in step c was 0.1%.
The invention has the beneficial effects that: the device and the method for determining the lower limit of gas explosion under the high-temperature condition of heat storage oxidation are characterized in that a heating device and a sensor assembly are arranged, when the device is used, firstly, heat storage ceramic in the heating device is preheated to a specified temperature, a heating cavity is vacuumized, air is introduced into the heating cavity after the vacuumization is finished, the air passes through an air hole of the heat storage ceramic and is heated to a test temperature by the wall of the high-temperature air hole, and the pressure P0 before the air enters the air hole of the heat storage ceramic and the pressure P1 after the air passes through the air hole of the heat storage ceramic are synchronously recorded; secondly, preheating the heat storage ceramic in the heating device to a specified temperature, vacuumizing the heating cavity, introducing gas into the heating cavity after vacuumizing, heating the gas to a test temperature by the wall of a high-temperature vent hole after the gas passes through the vent hole of the heat storage ceramic, and synchronously recording the pressure P0' before the gas enters the vent hole of the heat storage ceramic and the pressure P2 after the gas passes through the vent hole of the heat storage ceramic; finally, comparing P1 with P2, judging whether the soft sealing end is exploded or not by combining with whether the soft sealing end is broken or not, if the soft sealing end is not exploded, keeping the temperature unchanged, increasing the concentration of introduced gas, and repeating the test; if the gas is judged to be explosive, the temperature is changed, and the next test is carried out, so that the lower explosion limit of the gas under the high-temperature condition of over 900 ℃ can be measured, the measurement range is improved, and the accuracy of the test is ensured.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the test of the present invention.
Detailed Description
As shown in fig. 1 and 2, the direction indicated by the arrow in fig. 1 is the fluid flow direction: the device for determining the lower limit of gas explosion under the condition of heat storage oxidation high temperature comprises a heating device for heating air or gas and a sensor assembly arranged on the heating device, wherein the heating device comprises an outer wall 1 and a heating assembly arranged in the outer wall 1, a flow channel 3 for air or gas to flow through is arranged in the center of the outer wall 1, a heating cavity is formed in the middle of the flow channel 3 by an expanding section with a diameter larger than that of the flow channel 3, the heating assembly is positioned in the heating cavity and comprises an inner wall 4 and heat storage ceramics 5 which are sequentially arranged from outside to inside, an electric heater 6 for heating the heat storage ceramics 5 is arranged on the inner wall of the inner wall 4, a vent hole communicated with the flow channel 3 is arranged in the center of the heat storage ceramics 5, the sensor assembly comprises a pressure sensor 7 for detecting the pressure in the heating cavity and a temperature sensor 8 for detecting the temperature in the heating cavity, the lower explosion limit of gas at the high temperature of over 900 ℃ can be measured by arranging the outer wall 1, the inner wall 4 and the heating assembly, when the device is used, firstly, the heat storage ceramic in the heating device is preheated to the specified temperature, the heating cavity is vacuumized, air is introduced into the heating cavity after the vacuum pumping is finished, the air passes through the vent holes of the heat storage ceramic and is heated to the test temperature by the hole walls of the high-temperature vent holes, and the pressure P0 before the air enters the vent holes of the heat storage ceramic and the pressure P1 after the air passes through the vent holes of the heat storage ceramic are synchronously recorded; secondly, preheating the heat storage ceramic in the heating device to a specified temperature, vacuumizing the heating cavity, introducing gas into the heating cavity after vacuumizing, heating the gas to a test temperature by the wall of a high-temperature vent hole after the gas passes through the vent hole of the heat storage ceramic, and synchronously recording the pressure P0' before the gas enters the vent hole of the heat storage ceramic and the pressure P2 after the gas passes through the vent hole of the heat storage ceramic; finally, comparing P1 with P2, judging whether the soft sealing end is exploded or not by combining with whether the soft sealing end is broken or not, if the soft sealing end is not exploded, keeping the temperature unchanged, increasing the concentration of introduced gas, and repeating the test; if the explosion is judged, the temperature is changed, and the next test is carried out. In the embodiment, a blocking block 12 is arranged in the inlet end of a flow channel 3 of an outer wall 1, an air inlet 2 communicated with the flow channel 3 is arranged in the center of the blocking block 12 along the axial direction, the air inlet 2 is arranged to limit the inlet amount of air or gas and ensure the stable inlet of fluid, and the blocking block is made of ceramic fiber or high-alumina ceramic fiber material, so that the heat insulation effect is good and the heat resistance is good; the outlet end of the flow channel 3 is provided with a connecting joint for connecting with an external instrument so as to be connected with the external instrument and be convenient to use.
In this embodiment, an insulating layer is arranged between the outer wall of the inner wall 4 and the inner wall of the heating cavity to ensure constant temperature in the heating cavity.
In this embodiment, the heat preservation is the bilayer structure who comprises ceramic fiber board layer 9 and high alumina ceramic fiber board layer 10, and thermal-insulated thermal insulation performance is good, and supports intensity height, uses safe and reliable.
In this embodiment, the heat storage ceramic 5 is located in the center of the heating chamber, and the outer wall of the heat storage ceramic 5 and the inner wall 4 are sealed by the refractory mortar, so that fluid can only flow through the vent holes, the air-tight performance is ensured, and the test accuracy is improved.
In this embodiment, heat accumulation pottery 5 is two, and two heat accumulation pottery 5 set up side by side along the heating chamber axial, and sealed fixed through refractory mortar between two heat accumulation pottery 5 to guarantee that the fluid has sufficient heating temperature, improve the test accuracy.
In this embodiment, the axis of the vent hole overlaps with the axis of the flow channel 3 to ensure the consistency of fluid flow, facilitate gas flow, and ensure the testing effect.
In the embodiment, the outer surface of the outer wall 1 is provided with the shell 2, and the shell 11 is made of steel, so that the protection effect is improved; the outer wall 1 and the inner wall 4 are both refractory bricks, and have good heat resistance and high supporting strength so as to meet the test requirements.
In this embodiment, the pressure sensors 7 and the temperature sensors 8 are both vertically arranged on the outer wall 1, the pressure sensors 7 and the temperature sensors 8 are respectively located at two sides of the outer wall 1, the two pressure sensors 7 are symmetrically arranged at two axial ends of the heating cavity along the axial direction, the heat storage ceramic 5 is located between the two pressure sensors 7, and the two pressure sensors 7 are arranged to respectively detect the pressure of the fluid before entering the heat storage ceramic 5 and the pressure after being heated by the heat storage ceramic 5; the number of the temperature sensors 8 is seven, the temperature sensors 8 are S-scale temperature sensors 8 and are used for detecting the temperature in the heating cavity in real time, the accuracy is high, and the detection accuracy is guaranteed.
The invention also provides a method for determining the lower limit of gas explosion under the high-temperature condition of heat storage oxidation, which comprises the following steps:
a. preheating the heat storage ceramic 5 in the heating device to a specified temperature, vacuumizing the heating cavity, introducing air into the heating cavity after vacuumizing, heating the air to a test temperature by the wall of a high-temperature vent hole after the air passes through the vent hole of the heat storage ceramic 5, and synchronously recording the pressure P0 before the air enters the vent hole of the heat storage ceramic 5 and the pressure P1 after the air passes through the vent hole of the heat storage ceramic 5;
b. preheating the heat storage ceramic 5 in the heating device to a specified temperature, vacuumizing the heating cavity, introducing gas into the heating cavity after vacuumizing is finished, heating the gas to a test temperature by the wall of a high-temperature vent hole after the gas passes through the vent hole of the heat storage ceramic 5, and synchronously recording the pressure P0' before the gas enters the vent hole of the heat storage ceramic 5 and the pressure P2 after the gas passes through the vent hole of the heat storage ceramic 5;
c. comparing P1 with P2, judging whether the soft sealing end is exploded or not by combining with whether the soft sealing end is broken or not, if the soft sealing end is not exploded, keeping the temperature unchanged, increasing the concentration of introduced gas, and repeating the test; if the explosion is judged, the temperature is changed, and the next test is carried out.
In this embodiment, the pressure P0 before the air enters the vent holes of the heat storage ceramic 5 in step a is equal to the pressure P0' before the air enters the vent holes of the heat storage ceramic 5 in step b; the increase of the gas concentration in step c was 0.1%.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (2)
1. A method for determining the lower limit of gas explosion under the high-temperature condition of heat-accumulating oxidation comprises a heating device for heating air or gas and a sensor assembly arranged on the heating device, the heating device comprises an outer wall and a heating component arranged in the outer wall, a flow passage for air or gas to flow through is arranged in the center of the outer wall, the middle part of the flow passage is provided with an expanding section with the diameter larger than that of the flow passage to form a heating cavity, the heating assembly is positioned in the heating cavity, the heating component comprises an inner wall and heat storage ceramics which are sequentially arranged from outside to inside, an electric heater for heating the heat storage ceramics is arranged on the inner wall of the inner wall, the sensor assembly comprises a pressure sensor for detecting the pressure in the heating cavity and a temperature sensor for detecting the temperature in the heating cavity; an insulating layer is arranged between the outer wall of the inner wall and the inner wall of the heating cavity; the heat storage ceramic is positioned in the center of the heating cavity, and the outer wall and the inner wall of the heat storage ceramic are sealed by refractory mortar; the two heat storage ceramics are arranged side by side along the axial direction of the heating cavity, and the two heat storage ceramics are sealed and fixed through refractory mortar; the axis of the vent hole is overlapped with the axis of the flow passage; the outer surface of the outer wall is provided with a shell, the shell is made of steel, and the outer wall and the inner wall are both refractory bricks; the heat storage ceramic heating cavity comprises a heating cavity, a heat storage ceramic, a pressure sensor, a temperature sensor, a heat storage ceramic and a heat storage ceramic, wherein the pressure sensor and the temperature sensor are vertically arranged on an outer wall, the pressure sensor and the temperature sensor are respectively positioned on two sides of the outer wall, the number of the pressure sensors is two, the two pressure sensors are axially symmetrically arranged at two ends of the heating cavity in the axial direction, and the heat storage ceramic is positioned between the two pressure sensors; the temperature sensor is seven, and the temperature sensor is S graduation number temperature sensor, its characterized in that: the method comprises the following steps:
a. preheating the heat storage ceramic in the heating device to a specified temperature, vacuumizing the heating cavity, introducing air into the heating cavity after vacuumizing is finished, heating the air to a test temperature by the wall of a high-temperature vent hole after the air passes through the vent hole of the heat storage ceramic, and synchronously recording the pressure P0 before the air enters the vent hole of the heat storage ceramic and the pressure P1 after the air passes through the vent hole of the heat storage ceramic;
b. preheating the heat storage ceramic in the heating device to a specified temperature, vacuumizing the heating cavity, introducing gas into the heating cavity after vacuumizing is finished, heating the gas to a test temperature by the wall of a high-temperature vent hole after the gas passes through the vent hole of the heat storage ceramic, and synchronously recording the pressure P0' before the gas enters the vent hole of the heat storage ceramic and the pressure P2 after the gas passes through the vent hole of the heat storage ceramic;
c. comparing P1 with P2, judging whether the soft sealing end is exploded or not by combining with whether the soft sealing end is broken or not, if the soft sealing end is not exploded, keeping the temperature unchanged, increasing the concentration of introduced gas, and repeating the test; if the explosion is judged, the temperature is changed, and the next test is carried out.
2. The method of claim 1, wherein: the pressure P0 before the air enters the vent hole of the heat storage ceramic in the step a is equal to the pressure P0' before the air enters the vent hole of the heat storage ceramic in the step b; the increase of the gas concentration in step c was 0.1%.
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